1 /* Xtensa-specific support for 32-bit ELF.
2 Copyright 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
4 This file is part of BFD, the Binary File Descriptor library.
6 This program is free software; you can redistribute it and/or
7 modify it under the terms of the GNU General Public License as
8 published by the Free Software Foundation; either version 3 of the
9 License, or (at your option) any later version.
11 This program is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
30 #include "elf/xtensa.h"
31 #include "xtensa-isa.h"
32 #include "xtensa-config.h"
34 #define XTENSA_NO_NOP_REMOVAL 0
36 /* Local helper functions. */
38 static bfd_boolean add_extra_plt_sections (struct bfd_link_info *, int);
39 static char *vsprint_msg (const char *, const char *, int, ...) ATTRIBUTE_PRINTF(2,4);
40 static bfd_reloc_status_type bfd_elf_xtensa_reloc
41 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
42 static bfd_boolean do_fix_for_relocatable_link
43 (Elf_Internal_Rela *, bfd *, asection *, bfd_byte *);
44 static void do_fix_for_final_link
45 (Elf_Internal_Rela *, bfd *, asection *, bfd_byte *, bfd_vma *);
47 /* Local functions to handle Xtensa configurability. */
49 static bfd_boolean is_indirect_call_opcode (xtensa_opcode);
50 static bfd_boolean is_direct_call_opcode (xtensa_opcode);
51 static bfd_boolean is_windowed_call_opcode (xtensa_opcode);
52 static xtensa_opcode get_const16_opcode (void);
53 static xtensa_opcode get_l32r_opcode (void);
54 static bfd_vma l32r_offset (bfd_vma, bfd_vma);
55 static int get_relocation_opnd (xtensa_opcode, int);
56 static int get_relocation_slot (int);
57 static xtensa_opcode get_relocation_opcode
58 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *);
59 static bfd_boolean is_l32r_relocation
60 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *);
61 static bfd_boolean is_alt_relocation (int);
62 static bfd_boolean is_operand_relocation (int);
63 static bfd_size_type insn_decode_len
64 (bfd_byte *, bfd_size_type, bfd_size_type);
65 static xtensa_opcode insn_decode_opcode
66 (bfd_byte *, bfd_size_type, bfd_size_type, int);
67 static bfd_boolean check_branch_target_aligned
68 (bfd_byte *, bfd_size_type, bfd_vma, bfd_vma);
69 static bfd_boolean check_loop_aligned
70 (bfd_byte *, bfd_size_type, bfd_vma, bfd_vma);
71 static bfd_boolean check_branch_target_aligned_address (bfd_vma, int);
72 static bfd_size_type get_asm_simplify_size
73 (bfd_byte *, bfd_size_type, bfd_size_type);
75 /* Functions for link-time code simplifications. */
77 static bfd_reloc_status_type elf_xtensa_do_asm_simplify
78 (bfd_byte *, bfd_vma, bfd_vma, char **);
79 static bfd_reloc_status_type contract_asm_expansion
80 (bfd_byte *, bfd_vma, Elf_Internal_Rela *, char **);
81 static xtensa_opcode swap_callx_for_call_opcode (xtensa_opcode);
82 static xtensa_opcode get_expanded_call_opcode (bfd_byte *, int, bfd_boolean *);
84 /* Access to internal relocations, section contents and symbols. */
86 static Elf_Internal_Rela *retrieve_internal_relocs
87 (bfd *, asection *, bfd_boolean);
88 static void pin_internal_relocs (asection *, Elf_Internal_Rela *);
89 static void release_internal_relocs (asection *, Elf_Internal_Rela *);
90 static bfd_byte *retrieve_contents (bfd *, asection *, bfd_boolean);
91 static void pin_contents (asection *, bfd_byte *);
92 static void release_contents (asection *, bfd_byte *);
93 static Elf_Internal_Sym *retrieve_local_syms (bfd *);
95 /* Miscellaneous utility functions. */
97 static asection *elf_xtensa_get_plt_section (struct bfd_link_info *, int);
98 static asection *elf_xtensa_get_gotplt_section (struct bfd_link_info *, int);
99 static asection *get_elf_r_symndx_section (bfd *, unsigned long);
100 static struct elf_link_hash_entry *get_elf_r_symndx_hash_entry
101 (bfd *, unsigned long);
102 static bfd_vma get_elf_r_symndx_offset (bfd *, unsigned long);
103 static bfd_boolean is_reloc_sym_weak (bfd *, Elf_Internal_Rela *);
104 static bfd_boolean pcrel_reloc_fits (xtensa_opcode, int, bfd_vma, bfd_vma);
105 static bfd_boolean xtensa_is_property_section (asection *);
106 static bfd_boolean xtensa_is_insntable_section (asection *);
107 static bfd_boolean xtensa_is_littable_section (asection *);
108 static bfd_boolean xtensa_is_proptable_section (asection *);
109 static int internal_reloc_compare (const void *, const void *);
110 static int internal_reloc_matches (const void *, const void *);
111 extern asection *xtensa_get_property_section (asection *, const char *);
112 static flagword xtensa_get_property_predef_flags (asection *);
114 /* Other functions called directly by the linker. */
116 typedef void (*deps_callback_t)
117 (asection *, bfd_vma, asection *, bfd_vma, void *);
118 extern bfd_boolean xtensa_callback_required_dependence
119 (bfd *, asection *, struct bfd_link_info *, deps_callback_t, void *);
122 /* Globally visible flag for choosing size optimization of NOP removal
123 instead of branch-target-aware minimization for NOP removal.
124 When nonzero, narrow all instructions and remove all NOPs possible
125 around longcall expansions. */
127 int elf32xtensa_size_opt;
130 /* The "new_section_hook" is used to set up a per-section
131 "xtensa_relax_info" data structure with additional information used
132 during relaxation. */
134 typedef struct xtensa_relax_info_struct xtensa_relax_info;
137 /* The GNU tools do not easily allow extending interfaces to pass around
138 the pointer to the Xtensa ISA information, so instead we add a global
139 variable here (in BFD) that can be used by any of the tools that need
142 xtensa_isa xtensa_default_isa;
145 /* When this is true, relocations may have been modified to refer to
146 symbols from other input files. The per-section list of "fix"
147 records needs to be checked when resolving relocations. */
149 static bfd_boolean relaxing_section = FALSE;
151 /* When this is true, during final links, literals that cannot be
152 coalesced and their relocations may be moved to other sections. */
154 int elf32xtensa_no_literal_movement = 1;
157 static reloc_howto_type elf_howto_table[] =
159 HOWTO (R_XTENSA_NONE, 0, 0, 0, FALSE, 0, complain_overflow_dont,
160 bfd_elf_xtensa_reloc, "R_XTENSA_NONE",
162 HOWTO (R_XTENSA_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
163 bfd_elf_xtensa_reloc, "R_XTENSA_32",
164 TRUE, 0xffffffff, 0xffffffff, FALSE),
166 /* Replace a 32-bit value with a value from the runtime linker (only
167 used by linker-generated stub functions). The r_addend value is
168 special: 1 means to substitute a pointer to the runtime linker's
169 dynamic resolver function; 2 means to substitute the link map for
170 the shared object. */
171 HOWTO (R_XTENSA_RTLD, 0, 2, 32, FALSE, 0, complain_overflow_dont,
172 NULL, "R_XTENSA_RTLD", FALSE, 0, 0, FALSE),
174 HOWTO (R_XTENSA_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
175 bfd_elf_generic_reloc, "R_XTENSA_GLOB_DAT",
176 FALSE, 0, 0xffffffff, FALSE),
177 HOWTO (R_XTENSA_JMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
178 bfd_elf_generic_reloc, "R_XTENSA_JMP_SLOT",
179 FALSE, 0, 0xffffffff, FALSE),
180 HOWTO (R_XTENSA_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
181 bfd_elf_generic_reloc, "R_XTENSA_RELATIVE",
182 FALSE, 0, 0xffffffff, FALSE),
183 HOWTO (R_XTENSA_PLT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
184 bfd_elf_xtensa_reloc, "R_XTENSA_PLT",
185 FALSE, 0, 0xffffffff, FALSE),
189 /* Old relocations for backward compatibility. */
190 HOWTO (R_XTENSA_OP0, 0, 0, 0, TRUE, 0, complain_overflow_dont,
191 bfd_elf_xtensa_reloc, "R_XTENSA_OP0", FALSE, 0, 0, TRUE),
192 HOWTO (R_XTENSA_OP1, 0, 0, 0, TRUE, 0, complain_overflow_dont,
193 bfd_elf_xtensa_reloc, "R_XTENSA_OP1", FALSE, 0, 0, TRUE),
194 HOWTO (R_XTENSA_OP2, 0, 0, 0, TRUE, 0, complain_overflow_dont,
195 bfd_elf_xtensa_reloc, "R_XTENSA_OP2", FALSE, 0, 0, TRUE),
197 /* Assembly auto-expansion. */
198 HOWTO (R_XTENSA_ASM_EXPAND, 0, 0, 0, TRUE, 0, complain_overflow_dont,
199 bfd_elf_xtensa_reloc, "R_XTENSA_ASM_EXPAND", FALSE, 0, 0, TRUE),
200 /* Relax assembly auto-expansion. */
201 HOWTO (R_XTENSA_ASM_SIMPLIFY, 0, 0, 0, TRUE, 0, complain_overflow_dont,
202 bfd_elf_xtensa_reloc, "R_XTENSA_ASM_SIMPLIFY", FALSE, 0, 0, TRUE),
206 HOWTO (R_XTENSA_32_PCREL, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
207 bfd_elf_xtensa_reloc, "R_XTENSA_32_PCREL",
208 FALSE, 0, 0xffffffff, TRUE),
210 /* GNU extension to record C++ vtable hierarchy. */
211 HOWTO (R_XTENSA_GNU_VTINHERIT, 0, 2, 0, FALSE, 0, complain_overflow_dont,
212 NULL, "R_XTENSA_GNU_VTINHERIT",
214 /* GNU extension to record C++ vtable member usage. */
215 HOWTO (R_XTENSA_GNU_VTENTRY, 0, 2, 0, FALSE, 0, complain_overflow_dont,
216 _bfd_elf_rel_vtable_reloc_fn, "R_XTENSA_GNU_VTENTRY",
219 /* Relocations for supporting difference of symbols. */
220 HOWTO (R_XTENSA_DIFF8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
221 bfd_elf_xtensa_reloc, "R_XTENSA_DIFF8", FALSE, 0, 0xff, FALSE),
222 HOWTO (R_XTENSA_DIFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
223 bfd_elf_xtensa_reloc, "R_XTENSA_DIFF16", FALSE, 0, 0xffff, FALSE),
224 HOWTO (R_XTENSA_DIFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
225 bfd_elf_xtensa_reloc, "R_XTENSA_DIFF32", FALSE, 0, 0xffffffff, FALSE),
227 /* General immediate operand relocations. */
228 HOWTO (R_XTENSA_SLOT0_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
229 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT0_OP", FALSE, 0, 0, TRUE),
230 HOWTO (R_XTENSA_SLOT1_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
231 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT1_OP", FALSE, 0, 0, TRUE),
232 HOWTO (R_XTENSA_SLOT2_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
233 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT2_OP", FALSE, 0, 0, TRUE),
234 HOWTO (R_XTENSA_SLOT3_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
235 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT3_OP", FALSE, 0, 0, TRUE),
236 HOWTO (R_XTENSA_SLOT4_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
237 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT4_OP", FALSE, 0, 0, TRUE),
238 HOWTO (R_XTENSA_SLOT5_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
239 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT5_OP", FALSE, 0, 0, TRUE),
240 HOWTO (R_XTENSA_SLOT6_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
241 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT6_OP", FALSE, 0, 0, TRUE),
242 HOWTO (R_XTENSA_SLOT7_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
243 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT7_OP", FALSE, 0, 0, TRUE),
244 HOWTO (R_XTENSA_SLOT8_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
245 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT8_OP", FALSE, 0, 0, TRUE),
246 HOWTO (R_XTENSA_SLOT9_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
247 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT9_OP", FALSE, 0, 0, TRUE),
248 HOWTO (R_XTENSA_SLOT10_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
249 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT10_OP", FALSE, 0, 0, TRUE),
250 HOWTO (R_XTENSA_SLOT11_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
251 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT11_OP", FALSE, 0, 0, TRUE),
252 HOWTO (R_XTENSA_SLOT12_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
253 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT12_OP", FALSE, 0, 0, TRUE),
254 HOWTO (R_XTENSA_SLOT13_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
255 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT13_OP", FALSE, 0, 0, TRUE),
256 HOWTO (R_XTENSA_SLOT14_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
257 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT14_OP", FALSE, 0, 0, TRUE),
259 /* "Alternate" relocations. The meaning of these is opcode-specific. */
260 HOWTO (R_XTENSA_SLOT0_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
261 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT0_ALT", FALSE, 0, 0, TRUE),
262 HOWTO (R_XTENSA_SLOT1_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
263 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT1_ALT", FALSE, 0, 0, TRUE),
264 HOWTO (R_XTENSA_SLOT2_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
265 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT2_ALT", FALSE, 0, 0, TRUE),
266 HOWTO (R_XTENSA_SLOT3_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
267 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT3_ALT", FALSE, 0, 0, TRUE),
268 HOWTO (R_XTENSA_SLOT4_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
269 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT4_ALT", FALSE, 0, 0, TRUE),
270 HOWTO (R_XTENSA_SLOT5_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
271 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT5_ALT", FALSE, 0, 0, TRUE),
272 HOWTO (R_XTENSA_SLOT6_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
273 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT6_ALT", FALSE, 0, 0, TRUE),
274 HOWTO (R_XTENSA_SLOT7_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
275 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT7_ALT", FALSE, 0, 0, TRUE),
276 HOWTO (R_XTENSA_SLOT8_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
277 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT8_ALT", FALSE, 0, 0, TRUE),
278 HOWTO (R_XTENSA_SLOT9_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
279 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT9_ALT", FALSE, 0, 0, TRUE),
280 HOWTO (R_XTENSA_SLOT10_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
281 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT10_ALT", FALSE, 0, 0, TRUE),
282 HOWTO (R_XTENSA_SLOT11_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
283 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT11_ALT", FALSE, 0, 0, TRUE),
284 HOWTO (R_XTENSA_SLOT12_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
285 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT12_ALT", FALSE, 0, 0, TRUE),
286 HOWTO (R_XTENSA_SLOT13_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
287 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT13_ALT", FALSE, 0, 0, TRUE),
288 HOWTO (R_XTENSA_SLOT14_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
289 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT14_ALT", FALSE, 0, 0, TRUE),
294 fprintf (stderr, "Xtensa bfd reloc lookup %d (%s)\n", code, str)
299 static reloc_howto_type *
300 elf_xtensa_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
301 bfd_reloc_code_real_type code)
306 TRACE ("BFD_RELOC_NONE");
307 return &elf_howto_table[(unsigned) R_XTENSA_NONE ];
310 TRACE ("BFD_RELOC_32");
311 return &elf_howto_table[(unsigned) R_XTENSA_32 ];
313 case BFD_RELOC_32_PCREL:
314 TRACE ("BFD_RELOC_32_PCREL");
315 return &elf_howto_table[(unsigned) R_XTENSA_32_PCREL ];
317 case BFD_RELOC_XTENSA_DIFF8:
318 TRACE ("BFD_RELOC_XTENSA_DIFF8");
319 return &elf_howto_table[(unsigned) R_XTENSA_DIFF8 ];
321 case BFD_RELOC_XTENSA_DIFF16:
322 TRACE ("BFD_RELOC_XTENSA_DIFF16");
323 return &elf_howto_table[(unsigned) R_XTENSA_DIFF16 ];
325 case BFD_RELOC_XTENSA_DIFF32:
326 TRACE ("BFD_RELOC_XTENSA_DIFF32");
327 return &elf_howto_table[(unsigned) R_XTENSA_DIFF32 ];
329 case BFD_RELOC_XTENSA_RTLD:
330 TRACE ("BFD_RELOC_XTENSA_RTLD");
331 return &elf_howto_table[(unsigned) R_XTENSA_RTLD ];
333 case BFD_RELOC_XTENSA_GLOB_DAT:
334 TRACE ("BFD_RELOC_XTENSA_GLOB_DAT");
335 return &elf_howto_table[(unsigned) R_XTENSA_GLOB_DAT ];
337 case BFD_RELOC_XTENSA_JMP_SLOT:
338 TRACE ("BFD_RELOC_XTENSA_JMP_SLOT");
339 return &elf_howto_table[(unsigned) R_XTENSA_JMP_SLOT ];
341 case BFD_RELOC_XTENSA_RELATIVE:
342 TRACE ("BFD_RELOC_XTENSA_RELATIVE");
343 return &elf_howto_table[(unsigned) R_XTENSA_RELATIVE ];
345 case BFD_RELOC_XTENSA_PLT:
346 TRACE ("BFD_RELOC_XTENSA_PLT");
347 return &elf_howto_table[(unsigned) R_XTENSA_PLT ];
349 case BFD_RELOC_XTENSA_OP0:
350 TRACE ("BFD_RELOC_XTENSA_OP0");
351 return &elf_howto_table[(unsigned) R_XTENSA_OP0 ];
353 case BFD_RELOC_XTENSA_OP1:
354 TRACE ("BFD_RELOC_XTENSA_OP1");
355 return &elf_howto_table[(unsigned) R_XTENSA_OP1 ];
357 case BFD_RELOC_XTENSA_OP2:
358 TRACE ("BFD_RELOC_XTENSA_OP2");
359 return &elf_howto_table[(unsigned) R_XTENSA_OP2 ];
361 case BFD_RELOC_XTENSA_ASM_EXPAND:
362 TRACE ("BFD_RELOC_XTENSA_ASM_EXPAND");
363 return &elf_howto_table[(unsigned) R_XTENSA_ASM_EXPAND ];
365 case BFD_RELOC_XTENSA_ASM_SIMPLIFY:
366 TRACE ("BFD_RELOC_XTENSA_ASM_SIMPLIFY");
367 return &elf_howto_table[(unsigned) R_XTENSA_ASM_SIMPLIFY ];
369 case BFD_RELOC_VTABLE_INHERIT:
370 TRACE ("BFD_RELOC_VTABLE_INHERIT");
371 return &elf_howto_table[(unsigned) R_XTENSA_GNU_VTINHERIT ];
373 case BFD_RELOC_VTABLE_ENTRY:
374 TRACE ("BFD_RELOC_VTABLE_ENTRY");
375 return &elf_howto_table[(unsigned) R_XTENSA_GNU_VTENTRY ];
378 if (code >= BFD_RELOC_XTENSA_SLOT0_OP
379 && code <= BFD_RELOC_XTENSA_SLOT14_OP)
381 unsigned n = (R_XTENSA_SLOT0_OP +
382 (code - BFD_RELOC_XTENSA_SLOT0_OP));
383 return &elf_howto_table[n];
386 if (code >= BFD_RELOC_XTENSA_SLOT0_ALT
387 && code <= BFD_RELOC_XTENSA_SLOT14_ALT)
389 unsigned n = (R_XTENSA_SLOT0_ALT +
390 (code - BFD_RELOC_XTENSA_SLOT0_ALT));
391 return &elf_howto_table[n];
401 static reloc_howto_type *
402 elf_xtensa_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
407 for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++)
408 if (elf_howto_table[i].name != NULL
409 && strcasecmp (elf_howto_table[i].name, r_name) == 0)
410 return &elf_howto_table[i];
416 /* Given an ELF "rela" relocation, find the corresponding howto and record
417 it in the BFD internal arelent representation of the relocation. */
420 elf_xtensa_info_to_howto_rela (bfd *abfd ATTRIBUTE_UNUSED,
422 Elf_Internal_Rela *dst)
424 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
426 BFD_ASSERT (r_type < (unsigned int) R_XTENSA_max);
427 cache_ptr->howto = &elf_howto_table[r_type];
431 /* Functions for the Xtensa ELF linker. */
433 /* The name of the dynamic interpreter. This is put in the .interp
436 #define ELF_DYNAMIC_INTERPRETER "/lib/ld.so"
438 /* The size in bytes of an entry in the procedure linkage table.
439 (This does _not_ include the space for the literals associated with
442 #define PLT_ENTRY_SIZE 16
444 /* For _really_ large PLTs, we may need to alternate between literals
445 and code to keep the literals within the 256K range of the L32R
446 instructions in the code. It's unlikely that anyone would ever need
447 such a big PLT, but an arbitrary limit on the PLT size would be bad.
448 Thus, we split the PLT into chunks. Since there's very little
449 overhead (2 extra literals) for each chunk, the chunk size is kept
450 small so that the code for handling multiple chunks get used and
451 tested regularly. With 254 entries, there are 1K of literals for
452 each chunk, and that seems like a nice round number. */
454 #define PLT_ENTRIES_PER_CHUNK 254
456 /* PLT entries are actually used as stub functions for lazy symbol
457 resolution. Once the symbol is resolved, the stub function is never
458 invoked. Note: the 32-byte frame size used here cannot be changed
459 without a corresponding change in the runtime linker. */
461 static const bfd_byte elf_xtensa_be_plt_entry[PLT_ENTRY_SIZE] =
463 0x6c, 0x10, 0x04, /* entry sp, 32 */
464 0x18, 0x00, 0x00, /* l32r a8, [got entry for rtld's resolver] */
465 0x1a, 0x00, 0x00, /* l32r a10, [got entry for rtld's link map] */
466 0x1b, 0x00, 0x00, /* l32r a11, [literal for reloc index] */
467 0x0a, 0x80, 0x00, /* jx a8 */
471 static const bfd_byte elf_xtensa_le_plt_entry[PLT_ENTRY_SIZE] =
473 0x36, 0x41, 0x00, /* entry sp, 32 */
474 0x81, 0x00, 0x00, /* l32r a8, [got entry for rtld's resolver] */
475 0xa1, 0x00, 0x00, /* l32r a10, [got entry for rtld's link map] */
476 0xb1, 0x00, 0x00, /* l32r a11, [literal for reloc index] */
477 0xa0, 0x08, 0x00, /* jx a8 */
481 /* Xtensa ELF linker hash table. */
483 struct elf_xtensa_link_hash_table
485 struct elf_link_hash_table elf;
487 /* Short-cuts to get to dynamic linker sections. */
494 asection *spltlittbl;
496 /* Total count of PLT relocations seen during check_relocs.
497 The actual PLT code must be split into multiple sections and all
498 the sections have to be created before size_dynamic_sections,
499 where we figure out the exact number of PLT entries that will be
500 needed. It is OK if this count is an overestimate, e.g., some
501 relocations may be removed by GC. */
505 /* Get the Xtensa ELF linker hash table from a link_info structure. */
507 #define elf_xtensa_hash_table(p) \
508 ((struct elf_xtensa_link_hash_table *) ((p)->hash))
510 /* Create an Xtensa ELF linker hash table. */
512 static struct bfd_link_hash_table *
513 elf_xtensa_link_hash_table_create (bfd *abfd)
515 struct elf_xtensa_link_hash_table *ret;
516 bfd_size_type amt = sizeof (struct elf_xtensa_link_hash_table);
518 ret = bfd_malloc (amt);
522 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
523 _bfd_elf_link_hash_newfunc,
524 sizeof (struct elf_link_hash_entry)))
536 ret->spltlittbl = NULL;
538 ret->plt_reloc_count = 0;
540 return &ret->elf.root;
543 static inline bfd_boolean
544 elf_xtensa_dynamic_symbol_p (struct elf_link_hash_entry *h,
545 struct bfd_link_info *info)
547 /* Check if we should do dynamic things to this symbol. The
548 "ignore_protected" argument need not be set, because Xtensa code
549 does not require special handling of STV_PROTECTED to make function
550 pointer comparisons work properly. The PLT addresses are never
551 used for function pointers. */
553 return _bfd_elf_dynamic_symbol_p (h, info, 0);
558 property_table_compare (const void *ap, const void *bp)
560 const property_table_entry *a = (const property_table_entry *) ap;
561 const property_table_entry *b = (const property_table_entry *) bp;
563 if (a->address == b->address)
565 if (a->size != b->size)
566 return (a->size - b->size);
568 if ((a->flags & XTENSA_PROP_ALIGN) != (b->flags & XTENSA_PROP_ALIGN))
569 return ((b->flags & XTENSA_PROP_ALIGN)
570 - (a->flags & XTENSA_PROP_ALIGN));
572 if ((a->flags & XTENSA_PROP_ALIGN)
573 && (GET_XTENSA_PROP_ALIGNMENT (a->flags)
574 != GET_XTENSA_PROP_ALIGNMENT (b->flags)))
575 return (GET_XTENSA_PROP_ALIGNMENT (a->flags)
576 - GET_XTENSA_PROP_ALIGNMENT (b->flags));
578 if ((a->flags & XTENSA_PROP_UNREACHABLE)
579 != (b->flags & XTENSA_PROP_UNREACHABLE))
580 return ((b->flags & XTENSA_PROP_UNREACHABLE)
581 - (a->flags & XTENSA_PROP_UNREACHABLE));
583 return (a->flags - b->flags);
586 return (a->address - b->address);
591 property_table_matches (const void *ap, const void *bp)
593 const property_table_entry *a = (const property_table_entry *) ap;
594 const property_table_entry *b = (const property_table_entry *) bp;
596 /* Check if one entry overlaps with the other. */
597 if ((b->address >= a->address && b->address < (a->address + a->size))
598 || (a->address >= b->address && a->address < (b->address + b->size)))
601 return (a->address - b->address);
605 /* Get the literal table or property table entries for the given
606 section. Sets TABLE_P and returns the number of entries. On
607 error, returns a negative value. */
610 xtensa_read_table_entries (bfd *abfd,
612 property_table_entry **table_p,
613 const char *sec_name,
614 bfd_boolean output_addr)
616 asection *table_section;
617 bfd_size_type table_size = 0;
618 bfd_byte *table_data;
619 property_table_entry *blocks;
620 int blk, block_count;
621 bfd_size_type num_records;
622 Elf_Internal_Rela *internal_relocs, *irel, *rel_end;
623 bfd_vma section_addr, off;
624 flagword predef_flags;
625 bfd_size_type table_entry_size, section_limit;
628 || !(section->flags & SEC_ALLOC)
629 || (section->flags & SEC_DEBUGGING))
635 table_section = xtensa_get_property_section (section, sec_name);
637 table_size = table_section->size;
645 predef_flags = xtensa_get_property_predef_flags (table_section);
646 table_entry_size = 12;
648 table_entry_size -= 4;
650 num_records = table_size / table_entry_size;
651 table_data = retrieve_contents (abfd, table_section, TRUE);
652 blocks = (property_table_entry *)
653 bfd_malloc (num_records * sizeof (property_table_entry));
657 section_addr = section->output_section->vma + section->output_offset;
659 section_addr = section->vma;
661 internal_relocs = retrieve_internal_relocs (abfd, table_section, TRUE);
662 if (internal_relocs && !table_section->reloc_done)
664 qsort (internal_relocs, table_section->reloc_count,
665 sizeof (Elf_Internal_Rela), internal_reloc_compare);
666 irel = internal_relocs;
671 section_limit = bfd_get_section_limit (abfd, section);
672 rel_end = internal_relocs + table_section->reloc_count;
674 for (off = 0; off < table_size; off += table_entry_size)
676 bfd_vma address = bfd_get_32 (abfd, table_data + off);
678 /* Skip any relocations before the current offset. This should help
679 avoid confusion caused by unexpected relocations for the preceding
682 (irel->r_offset < off
683 || (irel->r_offset == off
684 && ELF32_R_TYPE (irel->r_info) == R_XTENSA_NONE)))
691 if (irel && irel->r_offset == off)
694 unsigned long r_symndx = ELF32_R_SYM (irel->r_info);
695 BFD_ASSERT (ELF32_R_TYPE (irel->r_info) == R_XTENSA_32);
697 if (get_elf_r_symndx_section (abfd, r_symndx) != section)
700 sym_off = get_elf_r_symndx_offset (abfd, r_symndx);
701 BFD_ASSERT (sym_off == 0);
702 address += (section_addr + sym_off + irel->r_addend);
706 if (address < section_addr
707 || address >= section_addr + section_limit)
711 blocks[block_count].address = address;
712 blocks[block_count].size = bfd_get_32 (abfd, table_data + off + 4);
714 blocks[block_count].flags = predef_flags;
716 blocks[block_count].flags = bfd_get_32 (abfd, table_data + off + 8);
720 release_contents (table_section, table_data);
721 release_internal_relocs (table_section, internal_relocs);
725 /* Now sort them into address order for easy reference. */
726 qsort (blocks, block_count, sizeof (property_table_entry),
727 property_table_compare);
729 /* Check that the table contents are valid. Problems may occur,
730 for example, if an unrelocated object file is stripped. */
731 for (blk = 1; blk < block_count; blk++)
733 /* The only circumstance where two entries may legitimately
734 have the same address is when one of them is a zero-size
735 placeholder to mark a place where fill can be inserted.
736 The zero-size entry should come first. */
737 if (blocks[blk - 1].address == blocks[blk].address &&
738 blocks[blk - 1].size != 0)
740 (*_bfd_error_handler) (_("%B(%A): invalid property table"),
742 bfd_set_error (bfd_error_bad_value);
754 static property_table_entry *
755 elf_xtensa_find_property_entry (property_table_entry *property_table,
756 int property_table_size,
759 property_table_entry entry;
760 property_table_entry *rv;
762 if (property_table_size == 0)
765 entry.address = addr;
769 rv = bsearch (&entry, property_table, property_table_size,
770 sizeof (property_table_entry), property_table_matches);
776 elf_xtensa_in_literal_pool (property_table_entry *lit_table,
780 if (elf_xtensa_find_property_entry (lit_table, lit_table_size, addr))
787 /* Look through the relocs for a section during the first phase, and
788 calculate needed space in the dynamic reloc sections. */
791 elf_xtensa_check_relocs (bfd *abfd,
792 struct bfd_link_info *info,
794 const Elf_Internal_Rela *relocs)
796 struct elf_xtensa_link_hash_table *htab;
797 Elf_Internal_Shdr *symtab_hdr;
798 struct elf_link_hash_entry **sym_hashes;
799 const Elf_Internal_Rela *rel;
800 const Elf_Internal_Rela *rel_end;
802 if (info->relocatable)
805 htab = elf_xtensa_hash_table (info);
806 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
807 sym_hashes = elf_sym_hashes (abfd);
809 rel_end = relocs + sec->reloc_count;
810 for (rel = relocs; rel < rel_end; rel++)
813 unsigned long r_symndx;
814 struct elf_link_hash_entry *h;
816 r_symndx = ELF32_R_SYM (rel->r_info);
817 r_type = ELF32_R_TYPE (rel->r_info);
819 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
821 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
826 if (r_symndx < symtab_hdr->sh_info)
830 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
831 while (h->root.type == bfd_link_hash_indirect
832 || h->root.type == bfd_link_hash_warning)
833 h = (struct elf_link_hash_entry *) h->root.u.i.link;
842 if ((sec->flags & SEC_ALLOC) != 0)
844 if (h->got.refcount <= 0)
847 h->got.refcount += 1;
852 /* If this relocation is against a local symbol, then it's
853 exactly the same as a normal local GOT entry. */
857 if ((sec->flags & SEC_ALLOC) != 0)
859 if (h->plt.refcount <= 0)
865 h->plt.refcount += 1;
867 /* Keep track of the total PLT relocation count even if we
868 don't yet know whether the dynamic sections will be
870 htab->plt_reloc_count += 1;
872 if (elf_hash_table (info)->dynamic_sections_created)
874 if (! add_extra_plt_sections (info, htab->plt_reloc_count))
881 if ((sec->flags & SEC_ALLOC) != 0)
883 bfd_signed_vma *local_got_refcounts;
885 /* This is a global offset table entry for a local symbol. */
886 local_got_refcounts = elf_local_got_refcounts (abfd);
887 if (local_got_refcounts == NULL)
891 size = symtab_hdr->sh_info;
892 size *= sizeof (bfd_signed_vma);
893 local_got_refcounts =
894 (bfd_signed_vma *) bfd_zalloc (abfd, size);
895 if (local_got_refcounts == NULL)
897 elf_local_got_refcounts (abfd) = local_got_refcounts;
899 local_got_refcounts[r_symndx] += 1;
903 case R_XTENSA_GNU_VTINHERIT:
904 /* This relocation describes the C++ object vtable hierarchy.
905 Reconstruct it for later use during GC. */
906 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
910 case R_XTENSA_GNU_VTENTRY:
911 /* This relocation describes which C++ vtable entries are actually
912 used. Record for later use during GC. */
913 BFD_ASSERT (h != NULL);
915 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
929 elf_xtensa_make_sym_local (struct bfd_link_info *info,
930 struct elf_link_hash_entry *h)
934 if (h->plt.refcount > 0)
936 /* For shared objects, there's no need for PLT entries for local
937 symbols (use RELATIVE relocs instead of JMP_SLOT relocs). */
938 if (h->got.refcount < 0)
940 h->got.refcount += h->plt.refcount;
946 /* Don't need any dynamic relocations at all. */
954 elf_xtensa_hide_symbol (struct bfd_link_info *info,
955 struct elf_link_hash_entry *h,
956 bfd_boolean force_local)
958 /* For a shared link, move the plt refcount to the got refcount to leave
959 space for RELATIVE relocs. */
960 elf_xtensa_make_sym_local (info, h);
962 _bfd_elf_link_hash_hide_symbol (info, h, force_local);
966 /* Return the section that should be marked against GC for a given
970 elf_xtensa_gc_mark_hook (asection *sec,
971 struct bfd_link_info *info,
972 Elf_Internal_Rela *rel,
973 struct elf_link_hash_entry *h,
974 Elf_Internal_Sym *sym)
976 /* Property sections are marked "KEEP" in the linker scripts, but they
977 should not cause other sections to be marked. (This approach relies
978 on elf_xtensa_discard_info to remove property table entries that
979 describe discarded sections. Alternatively, it might be more
980 efficient to avoid using "KEEP" in the linker scripts and instead use
981 the gc_mark_extra_sections hook to mark only the property sections
982 that describe marked sections. That alternative does not work well
983 with the current property table sections, which do not correspond
984 one-to-one with the sections they describe, but that should be fixed
986 if (xtensa_is_property_section (sec))
990 switch (ELF32_R_TYPE (rel->r_info))
992 case R_XTENSA_GNU_VTINHERIT:
993 case R_XTENSA_GNU_VTENTRY:
997 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1001 /* Update the GOT & PLT entry reference counts
1002 for the section being removed. */
1005 elf_xtensa_gc_sweep_hook (bfd *abfd,
1006 struct bfd_link_info *info ATTRIBUTE_UNUSED,
1008 const Elf_Internal_Rela *relocs)
1010 Elf_Internal_Shdr *symtab_hdr;
1011 struct elf_link_hash_entry **sym_hashes;
1012 bfd_signed_vma *local_got_refcounts;
1013 const Elf_Internal_Rela *rel, *relend;
1015 if (info->relocatable)
1018 if ((sec->flags & SEC_ALLOC) == 0)
1021 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1022 sym_hashes = elf_sym_hashes (abfd);
1023 local_got_refcounts = elf_local_got_refcounts (abfd);
1025 relend = relocs + sec->reloc_count;
1026 for (rel = relocs; rel < relend; rel++)
1028 unsigned long r_symndx;
1029 unsigned int r_type;
1030 struct elf_link_hash_entry *h = NULL;
1032 r_symndx = ELF32_R_SYM (rel->r_info);
1033 if (r_symndx >= symtab_hdr->sh_info)
1035 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1036 while (h->root.type == bfd_link_hash_indirect
1037 || h->root.type == bfd_link_hash_warning)
1038 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1041 r_type = ELF32_R_TYPE (rel->r_info);
1047 if (h->got.refcount > 0)
1054 if (h->plt.refcount > 0)
1059 if (local_got_refcounts[r_symndx] > 0)
1060 local_got_refcounts[r_symndx] -= 1;
1072 /* Create all the dynamic sections. */
1075 elf_xtensa_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
1077 struct elf_xtensa_link_hash_table *htab;
1078 flagword flags, noalloc_flags;
1080 htab = elf_xtensa_hash_table (info);
1082 /* First do all the standard stuff. */
1083 if (! _bfd_elf_create_dynamic_sections (dynobj, info))
1085 htab->splt = bfd_get_section_by_name (dynobj, ".plt");
1086 htab->srelplt = bfd_get_section_by_name (dynobj, ".rela.plt");
1087 htab->sgot = bfd_get_section_by_name (dynobj, ".got");
1088 htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
1090 /* Create any extra PLT sections in case check_relocs has already
1091 been called on all the non-dynamic input files. */
1092 if (! add_extra_plt_sections (info, htab->plt_reloc_count))
1095 noalloc_flags = (SEC_HAS_CONTENTS | SEC_IN_MEMORY
1096 | SEC_LINKER_CREATED | SEC_READONLY);
1097 flags = noalloc_flags | SEC_ALLOC | SEC_LOAD;
1099 /* Mark the ".got.plt" section READONLY. */
1100 if (htab->sgotplt == NULL
1101 || ! bfd_set_section_flags (dynobj, htab->sgotplt, flags))
1104 /* Create ".rela.got". */
1105 htab->srelgot = bfd_make_section_with_flags (dynobj, ".rela.got", flags);
1106 if (htab->srelgot == NULL
1107 || ! bfd_set_section_alignment (dynobj, htab->srelgot, 2))
1110 /* Create ".got.loc" (literal tables for use by dynamic linker). */
1111 htab->sgotloc = bfd_make_section_with_flags (dynobj, ".got.loc", flags);
1112 if (htab->sgotloc == NULL
1113 || ! bfd_set_section_alignment (dynobj, htab->sgotloc, 2))
1116 /* Create ".xt.lit.plt" (literal table for ".got.plt*"). */
1117 htab->spltlittbl = bfd_make_section_with_flags (dynobj, ".xt.lit.plt",
1119 if (htab->spltlittbl == NULL
1120 || ! bfd_set_section_alignment (dynobj, htab->spltlittbl, 2))
1128 add_extra_plt_sections (struct bfd_link_info *info, int count)
1130 bfd *dynobj = elf_hash_table (info)->dynobj;
1133 /* Iterate over all chunks except 0 which uses the standard ".plt" and
1134 ".got.plt" sections. */
1135 for (chunk = count / PLT_ENTRIES_PER_CHUNK; chunk > 0; chunk--)
1141 /* Stop when we find a section has already been created. */
1142 if (elf_xtensa_get_plt_section (info, chunk))
1145 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1146 | SEC_LINKER_CREATED | SEC_READONLY);
1148 sname = (char *) bfd_malloc (10);
1149 sprintf (sname, ".plt.%u", chunk);
1150 s = bfd_make_section_with_flags (dynobj, sname, flags | SEC_CODE);
1152 || ! bfd_set_section_alignment (dynobj, s, 2))
1155 sname = (char *) bfd_malloc (14);
1156 sprintf (sname, ".got.plt.%u", chunk);
1157 s = bfd_make_section_with_flags (dynobj, sname, flags);
1159 || ! bfd_set_section_alignment (dynobj, s, 2))
1167 /* Adjust a symbol defined by a dynamic object and referenced by a
1168 regular object. The current definition is in some section of the
1169 dynamic object, but we're not including those sections. We have to
1170 change the definition to something the rest of the link can
1174 elf_xtensa_adjust_dynamic_symbol (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1175 struct elf_link_hash_entry *h)
1177 /* If this is a weak symbol, and there is a real definition, the
1178 processor independent code will have arranged for us to see the
1179 real definition first, and we can just use the same value. */
1182 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1183 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1184 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1185 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1189 /* This is a reference to a symbol defined by a dynamic object. The
1190 reference must go through the GOT, so there's no need for COPY relocs,
1198 elf_xtensa_allocate_dynrelocs (struct elf_link_hash_entry *h, void *arg)
1200 struct bfd_link_info *info;
1201 struct elf_xtensa_link_hash_table *htab;
1202 bfd_boolean is_dynamic;
1204 if (h->root.type == bfd_link_hash_indirect)
1207 if (h->root.type == bfd_link_hash_warning)
1208 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1210 info = (struct bfd_link_info *) arg;
1211 htab = elf_xtensa_hash_table (info);
1213 is_dynamic = elf_xtensa_dynamic_symbol_p (h, info);
1216 elf_xtensa_make_sym_local (info, h);
1218 if (h->plt.refcount > 0)
1219 htab->srelplt->size += (h->plt.refcount * sizeof (Elf32_External_Rela));
1221 if (h->got.refcount > 0)
1222 htab->srelgot->size += (h->got.refcount * sizeof (Elf32_External_Rela));
1229 elf_xtensa_allocate_local_got_size (struct bfd_link_info *info)
1231 struct elf_xtensa_link_hash_table *htab;
1234 htab = elf_xtensa_hash_table (info);
1236 for (i = info->input_bfds; i; i = i->link_next)
1238 bfd_signed_vma *local_got_refcounts;
1239 bfd_size_type j, cnt;
1240 Elf_Internal_Shdr *symtab_hdr;
1242 local_got_refcounts = elf_local_got_refcounts (i);
1243 if (!local_got_refcounts)
1246 symtab_hdr = &elf_tdata (i)->symtab_hdr;
1247 cnt = symtab_hdr->sh_info;
1249 for (j = 0; j < cnt; ++j)
1251 if (local_got_refcounts[j] > 0)
1252 htab->srelgot->size += (local_got_refcounts[j]
1253 * sizeof (Elf32_External_Rela));
1259 /* Set the sizes of the dynamic sections. */
1262 elf_xtensa_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
1263 struct bfd_link_info *info)
1265 struct elf_xtensa_link_hash_table *htab;
1267 asection *s, *srelplt, *splt, *sgotplt, *srelgot, *spltlittbl, *sgotloc;
1268 bfd_boolean relplt, relgot;
1269 int plt_entries, plt_chunks, chunk;
1274 htab = elf_xtensa_hash_table (info);
1275 dynobj = elf_hash_table (info)->dynobj;
1278 srelgot = htab->srelgot;
1279 srelplt = htab->srelplt;
1281 if (elf_hash_table (info)->dynamic_sections_created)
1283 BFD_ASSERT (htab->srelgot != NULL
1284 && htab->srelplt != NULL
1285 && htab->sgot != NULL
1286 && htab->spltlittbl != NULL
1287 && htab->sgotloc != NULL);
1289 /* Set the contents of the .interp section to the interpreter. */
1290 if (info->executable)
1292 s = bfd_get_section_by_name (dynobj, ".interp");
1295 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
1296 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1299 /* Allocate room for one word in ".got". */
1300 htab->sgot->size = 4;
1302 /* Allocate space in ".rela.got" for literals that reference global
1303 symbols and space in ".rela.plt" for literals that have PLT
1305 elf_link_hash_traverse (elf_hash_table (info),
1306 elf_xtensa_allocate_dynrelocs,
1309 /* If we are generating a shared object, we also need space in
1310 ".rela.got" for R_XTENSA_RELATIVE relocs for literals that
1311 reference local symbols. */
1313 elf_xtensa_allocate_local_got_size (info);
1315 /* Allocate space in ".plt" to match the size of ".rela.plt". For
1316 each PLT entry, we need the PLT code plus a 4-byte literal.
1317 For each chunk of ".plt", we also need two more 4-byte
1318 literals, two corresponding entries in ".rela.got", and an
1319 8-byte entry in ".xt.lit.plt". */
1320 spltlittbl = htab->spltlittbl;
1321 plt_entries = srelplt->size / sizeof (Elf32_External_Rela);
1323 (plt_entries + PLT_ENTRIES_PER_CHUNK - 1) / PLT_ENTRIES_PER_CHUNK;
1325 /* Iterate over all the PLT chunks, including any extra sections
1326 created earlier because the initial count of PLT relocations
1327 was an overestimate. */
1329 (splt = elf_xtensa_get_plt_section (info, chunk)) != NULL;
1334 sgotplt = elf_xtensa_get_gotplt_section (info, chunk);
1335 BFD_ASSERT (sgotplt != NULL);
1337 if (chunk < plt_chunks - 1)
1338 chunk_entries = PLT_ENTRIES_PER_CHUNK;
1339 else if (chunk == plt_chunks - 1)
1340 chunk_entries = plt_entries - (chunk * PLT_ENTRIES_PER_CHUNK);
1344 if (chunk_entries != 0)
1346 sgotplt->size = 4 * (chunk_entries + 2);
1347 splt->size = PLT_ENTRY_SIZE * chunk_entries;
1348 srelgot->size += 2 * sizeof (Elf32_External_Rela);
1349 spltlittbl->size += 8;
1358 /* Allocate space in ".got.loc" to match the total size of all the
1360 sgotloc = htab->sgotloc;
1361 sgotloc->size = spltlittbl->size;
1362 for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link_next)
1364 if (abfd->flags & DYNAMIC)
1366 for (s = abfd->sections; s != NULL; s = s->next)
1368 if (! elf_discarded_section (s)
1369 && xtensa_is_littable_section (s)
1371 sgotloc->size += s->size;
1376 /* Allocate memory for dynamic sections. */
1379 for (s = dynobj->sections; s != NULL; s = s->next)
1383 if ((s->flags & SEC_LINKER_CREATED) == 0)
1386 /* It's OK to base decisions on the section name, because none
1387 of the dynobj section names depend upon the input files. */
1388 name = bfd_get_section_name (dynobj, s);
1390 if (CONST_STRNEQ (name, ".rela"))
1394 if (strcmp (name, ".rela.plt") == 0)
1396 else if (strcmp (name, ".rela.got") == 0)
1399 /* We use the reloc_count field as a counter if we need
1400 to copy relocs into the output file. */
1404 else if (! CONST_STRNEQ (name, ".plt.")
1405 && ! CONST_STRNEQ (name, ".got.plt.")
1406 && strcmp (name, ".got") != 0
1407 && strcmp (name, ".plt") != 0
1408 && strcmp (name, ".got.plt") != 0
1409 && strcmp (name, ".xt.lit.plt") != 0
1410 && strcmp (name, ".got.loc") != 0)
1412 /* It's not one of our sections, so don't allocate space. */
1418 /* If we don't need this section, strip it from the output
1419 file. We must create the ".plt*" and ".got.plt*"
1420 sections in create_dynamic_sections and/or check_relocs
1421 based on a conservative estimate of the PLT relocation
1422 count, because the sections must be created before the
1423 linker maps input sections to output sections. The
1424 linker does that before size_dynamic_sections, where we
1425 compute the exact size of the PLT, so there may be more
1426 of these sections than are actually needed. */
1427 s->flags |= SEC_EXCLUDE;
1429 else if ((s->flags & SEC_HAS_CONTENTS) != 0)
1431 /* Allocate memory for the section contents. */
1432 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
1433 if (s->contents == NULL)
1438 if (elf_hash_table (info)->dynamic_sections_created)
1440 /* Add the special XTENSA_RTLD relocations now. The offsets won't be
1441 known until finish_dynamic_sections, but we need to get the relocs
1442 in place before they are sorted. */
1443 for (chunk = 0; chunk < plt_chunks; chunk++)
1445 Elf_Internal_Rela irela;
1449 irela.r_info = ELF32_R_INFO (0, R_XTENSA_RTLD);
1452 loc = (srelgot->contents
1453 + srelgot->reloc_count * sizeof (Elf32_External_Rela));
1454 bfd_elf32_swap_reloca_out (output_bfd, &irela, loc);
1455 bfd_elf32_swap_reloca_out (output_bfd, &irela,
1456 loc + sizeof (Elf32_External_Rela));
1457 srelgot->reloc_count += 2;
1460 /* Add some entries to the .dynamic section. We fill in the
1461 values later, in elf_xtensa_finish_dynamic_sections, but we
1462 must add the entries now so that we get the correct size for
1463 the .dynamic section. The DT_DEBUG entry is filled in by the
1464 dynamic linker and used by the debugger. */
1465 #define add_dynamic_entry(TAG, VAL) \
1466 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
1468 if (info->executable)
1470 if (!add_dynamic_entry (DT_DEBUG, 0))
1476 if (!add_dynamic_entry (DT_PLTRELSZ, 0)
1477 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
1478 || !add_dynamic_entry (DT_JMPREL, 0))
1484 if (!add_dynamic_entry (DT_RELA, 0)
1485 || !add_dynamic_entry (DT_RELASZ, 0)
1486 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
1490 if (!add_dynamic_entry (DT_PLTGOT, 0)
1491 || !add_dynamic_entry (DT_XTENSA_GOT_LOC_OFF, 0)
1492 || !add_dynamic_entry (DT_XTENSA_GOT_LOC_SZ, 0))
1495 #undef add_dynamic_entry
1501 /* Perform the specified relocation. The instruction at (contents + address)
1502 is modified to set one operand to represent the value in "relocation". The
1503 operand position is determined by the relocation type recorded in the
1506 #define CALL_SEGMENT_BITS (30)
1507 #define CALL_SEGMENT_SIZE (1 << CALL_SEGMENT_BITS)
1509 static bfd_reloc_status_type
1510 elf_xtensa_do_reloc (reloc_howto_type *howto,
1512 asection *input_section,
1516 bfd_boolean is_weak_undef,
1517 char **error_message)
1520 xtensa_opcode opcode;
1521 xtensa_isa isa = xtensa_default_isa;
1522 static xtensa_insnbuf ibuff = NULL;
1523 static xtensa_insnbuf sbuff = NULL;
1524 bfd_vma self_address;
1525 bfd_size_type input_size;
1531 ibuff = xtensa_insnbuf_alloc (isa);
1532 sbuff = xtensa_insnbuf_alloc (isa);
1535 input_size = bfd_get_section_limit (abfd, input_section);
1537 /* Calculate the PC address for this instruction. */
1538 self_address = (input_section->output_section->vma
1539 + input_section->output_offset
1542 switch (howto->type)
1545 case R_XTENSA_DIFF8:
1546 case R_XTENSA_DIFF16:
1547 case R_XTENSA_DIFF32:
1548 return bfd_reloc_ok;
1550 case R_XTENSA_ASM_EXPAND:
1553 /* Check for windowed CALL across a 1GB boundary. */
1554 xtensa_opcode opcode =
1555 get_expanded_call_opcode (contents + address,
1556 input_size - address, 0);
1557 if (is_windowed_call_opcode (opcode))
1559 if ((self_address >> CALL_SEGMENT_BITS)
1560 != (relocation >> CALL_SEGMENT_BITS))
1562 *error_message = "windowed longcall crosses 1GB boundary; "
1564 return bfd_reloc_dangerous;
1568 return bfd_reloc_ok;
1570 case R_XTENSA_ASM_SIMPLIFY:
1572 /* Convert the L32R/CALLX to CALL. */
1573 bfd_reloc_status_type retval =
1574 elf_xtensa_do_asm_simplify (contents, address, input_size,
1576 if (retval != bfd_reloc_ok)
1577 return bfd_reloc_dangerous;
1579 /* The CALL needs to be relocated. Continue below for that part. */
1582 howto = &elf_howto_table[(unsigned) R_XTENSA_SLOT0_OP ];
1590 x = bfd_get_32 (abfd, contents + address);
1592 bfd_put_32 (abfd, x, contents + address);
1594 return bfd_reloc_ok;
1596 case R_XTENSA_32_PCREL:
1597 bfd_put_32 (abfd, relocation - self_address, contents + address);
1598 return bfd_reloc_ok;
1601 /* Only instruction slot-specific relocations handled below.... */
1602 slot = get_relocation_slot (howto->type);
1603 if (slot == XTENSA_UNDEFINED)
1605 *error_message = "unexpected relocation";
1606 return bfd_reloc_dangerous;
1609 /* Read the instruction into a buffer and decode the opcode. */
1610 xtensa_insnbuf_from_chars (isa, ibuff, contents + address,
1611 input_size - address);
1612 fmt = xtensa_format_decode (isa, ibuff);
1613 if (fmt == XTENSA_UNDEFINED)
1615 *error_message = "cannot decode instruction format";
1616 return bfd_reloc_dangerous;
1619 xtensa_format_get_slot (isa, fmt, slot, ibuff, sbuff);
1621 opcode = xtensa_opcode_decode (isa, fmt, slot, sbuff);
1622 if (opcode == XTENSA_UNDEFINED)
1624 *error_message = "cannot decode instruction opcode";
1625 return bfd_reloc_dangerous;
1628 /* Check for opcode-specific "alternate" relocations. */
1629 if (is_alt_relocation (howto->type))
1631 if (opcode == get_l32r_opcode ())
1633 /* Handle the special-case of non-PC-relative L32R instructions. */
1634 bfd *output_bfd = input_section->output_section->owner;
1635 asection *lit4_sec = bfd_get_section_by_name (output_bfd, ".lit4");
1638 *error_message = "relocation references missing .lit4 section";
1639 return bfd_reloc_dangerous;
1641 self_address = ((lit4_sec->vma & ~0xfff)
1642 + 0x40000 - 3); /* -3 to compensate for do_reloc */
1643 newval = relocation;
1646 else if (opcode == get_const16_opcode ())
1648 /* ALT used for high 16 bits. */
1649 newval = relocation >> 16;
1654 /* No other "alternate" relocations currently defined. */
1655 *error_message = "unexpected relocation";
1656 return bfd_reloc_dangerous;
1659 else /* Not an "alternate" relocation.... */
1661 if (opcode == get_const16_opcode ())
1663 newval = relocation & 0xffff;
1668 /* ...normal PC-relative relocation.... */
1670 /* Determine which operand is being relocated. */
1671 opnd = get_relocation_opnd (opcode, howto->type);
1672 if (opnd == XTENSA_UNDEFINED)
1674 *error_message = "unexpected relocation";
1675 return bfd_reloc_dangerous;
1678 if (!howto->pc_relative)
1680 *error_message = "expected PC-relative relocation";
1681 return bfd_reloc_dangerous;
1684 newval = relocation;
1688 /* Apply the relocation. */
1689 if (xtensa_operand_do_reloc (isa, opcode, opnd, &newval, self_address)
1690 || xtensa_operand_encode (isa, opcode, opnd, &newval)
1691 || xtensa_operand_set_field (isa, opcode, opnd, fmt, slot,
1694 const char *opname = xtensa_opcode_name (isa, opcode);
1697 msg = "cannot encode";
1698 if (is_direct_call_opcode (opcode))
1700 if ((relocation & 0x3) != 0)
1701 msg = "misaligned call target";
1703 msg = "call target out of range";
1705 else if (opcode == get_l32r_opcode ())
1707 if ((relocation & 0x3) != 0)
1708 msg = "misaligned literal target";
1709 else if (is_alt_relocation (howto->type))
1710 msg = "literal target out of range (too many literals)";
1711 else if (self_address > relocation)
1712 msg = "literal target out of range (try using text-section-literals)";
1714 msg = "literal placed after use";
1717 *error_message = vsprint_msg (opname, ": %s", strlen (msg) + 2, msg);
1718 return bfd_reloc_dangerous;
1721 /* Check for calls across 1GB boundaries. */
1722 if (is_direct_call_opcode (opcode)
1723 && is_windowed_call_opcode (opcode))
1725 if ((self_address >> CALL_SEGMENT_BITS)
1726 != (relocation >> CALL_SEGMENT_BITS))
1729 "windowed call crosses 1GB boundary; return may fail";
1730 return bfd_reloc_dangerous;
1734 /* Write the modified instruction back out of the buffer. */
1735 xtensa_format_set_slot (isa, fmt, slot, ibuff, sbuff);
1736 xtensa_insnbuf_to_chars (isa, ibuff, contents + address,
1737 input_size - address);
1738 return bfd_reloc_ok;
1743 vsprint_msg (const char *origmsg, const char *fmt, int arglen, ...)
1745 /* To reduce the size of the memory leak,
1746 we only use a single message buffer. */
1747 static bfd_size_type alloc_size = 0;
1748 static char *message = NULL;
1749 bfd_size_type orig_len, len = 0;
1750 bfd_boolean is_append;
1752 VA_OPEN (ap, arglen);
1753 VA_FIXEDARG (ap, const char *, origmsg);
1755 is_append = (origmsg == message);
1757 orig_len = strlen (origmsg);
1758 len = orig_len + strlen (fmt) + arglen + 20;
1759 if (len > alloc_size)
1761 message = (char *) bfd_realloc (message, len);
1765 memcpy (message, origmsg, orig_len);
1766 vsprintf (message + orig_len, fmt, ap);
1772 /* This function is registered as the "special_function" in the
1773 Xtensa howto for handling simplify operations.
1774 bfd_perform_relocation / bfd_install_relocation use it to
1775 perform (install) the specified relocation. Since this replaces the code
1776 in bfd_perform_relocation, it is basically an Xtensa-specific,
1777 stripped-down version of bfd_perform_relocation. */
1779 static bfd_reloc_status_type
1780 bfd_elf_xtensa_reloc (bfd *abfd,
1781 arelent *reloc_entry,
1784 asection *input_section,
1786 char **error_message)
1789 bfd_reloc_status_type flag;
1790 bfd_size_type octets = reloc_entry->address * bfd_octets_per_byte (abfd);
1791 bfd_vma output_base = 0;
1792 reloc_howto_type *howto = reloc_entry->howto;
1793 asection *reloc_target_output_section;
1794 bfd_boolean is_weak_undef;
1796 if (!xtensa_default_isa)
1797 xtensa_default_isa = xtensa_isa_init (0, 0);
1799 /* ELF relocs are against symbols. If we are producing relocatable
1800 output, and the reloc is against an external symbol, the resulting
1801 reloc will also be against the same symbol. In such a case, we
1802 don't want to change anything about the way the reloc is handled,
1803 since it will all be done at final link time. This test is similar
1804 to what bfd_elf_generic_reloc does except that it lets relocs with
1805 howto->partial_inplace go through even if the addend is non-zero.
1806 (The real problem is that partial_inplace is set for XTENSA_32
1807 relocs to begin with, but that's a long story and there's little we
1808 can do about it now....) */
1810 if (output_bfd && (symbol->flags & BSF_SECTION_SYM) == 0)
1812 reloc_entry->address += input_section->output_offset;
1813 return bfd_reloc_ok;
1816 /* Is the address of the relocation really within the section? */
1817 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section))
1818 return bfd_reloc_outofrange;
1820 /* Work out which section the relocation is targeted at and the
1821 initial relocation command value. */
1823 /* Get symbol value. (Common symbols are special.) */
1824 if (bfd_is_com_section (symbol->section))
1827 relocation = symbol->value;
1829 reloc_target_output_section = symbol->section->output_section;
1831 /* Convert input-section-relative symbol value to absolute. */
1832 if ((output_bfd && !howto->partial_inplace)
1833 || reloc_target_output_section == NULL)
1836 output_base = reloc_target_output_section->vma;
1838 relocation += output_base + symbol->section->output_offset;
1840 /* Add in supplied addend. */
1841 relocation += reloc_entry->addend;
1843 /* Here the variable relocation holds the final address of the
1844 symbol we are relocating against, plus any addend. */
1847 if (!howto->partial_inplace)
1849 /* This is a partial relocation, and we want to apply the relocation
1850 to the reloc entry rather than the raw data. Everything except
1851 relocations against section symbols has already been handled
1854 BFD_ASSERT (symbol->flags & BSF_SECTION_SYM);
1855 reloc_entry->addend = relocation;
1856 reloc_entry->address += input_section->output_offset;
1857 return bfd_reloc_ok;
1861 reloc_entry->address += input_section->output_offset;
1862 reloc_entry->addend = 0;
1866 is_weak_undef = (bfd_is_und_section (symbol->section)
1867 && (symbol->flags & BSF_WEAK) != 0);
1868 flag = elf_xtensa_do_reloc (howto, abfd, input_section, relocation,
1869 (bfd_byte *) data, (bfd_vma) octets,
1870 is_weak_undef, error_message);
1872 if (flag == bfd_reloc_dangerous)
1874 /* Add the symbol name to the error message. */
1875 if (! *error_message)
1876 *error_message = "";
1877 *error_message = vsprint_msg (*error_message, ": (%s + 0x%lx)",
1878 strlen (symbol->name) + 17,
1880 (unsigned long) reloc_entry->addend);
1887 /* Set up an entry in the procedure linkage table. */
1890 elf_xtensa_create_plt_entry (struct bfd_link_info *info,
1892 unsigned reloc_index)
1894 asection *splt, *sgotplt;
1895 bfd_vma plt_base, got_base;
1896 bfd_vma code_offset, lit_offset;
1899 chunk = reloc_index / PLT_ENTRIES_PER_CHUNK;
1900 splt = elf_xtensa_get_plt_section (info, chunk);
1901 sgotplt = elf_xtensa_get_gotplt_section (info, chunk);
1902 BFD_ASSERT (splt != NULL && sgotplt != NULL);
1904 plt_base = splt->output_section->vma + splt->output_offset;
1905 got_base = sgotplt->output_section->vma + sgotplt->output_offset;
1907 lit_offset = 8 + (reloc_index % PLT_ENTRIES_PER_CHUNK) * 4;
1908 code_offset = (reloc_index % PLT_ENTRIES_PER_CHUNK) * PLT_ENTRY_SIZE;
1910 /* Fill in the literal entry. This is the offset of the dynamic
1911 relocation entry. */
1912 bfd_put_32 (output_bfd, reloc_index * sizeof (Elf32_External_Rela),
1913 sgotplt->contents + lit_offset);
1915 /* Fill in the entry in the procedure linkage table. */
1916 memcpy (splt->contents + code_offset,
1917 (bfd_big_endian (output_bfd)
1918 ? elf_xtensa_be_plt_entry
1919 : elf_xtensa_le_plt_entry),
1921 bfd_put_16 (output_bfd, l32r_offset (got_base + 0,
1922 plt_base + code_offset + 3),
1923 splt->contents + code_offset + 4);
1924 bfd_put_16 (output_bfd, l32r_offset (got_base + 4,
1925 plt_base + code_offset + 6),
1926 splt->contents + code_offset + 7);
1927 bfd_put_16 (output_bfd, l32r_offset (got_base + lit_offset,
1928 plt_base + code_offset + 9),
1929 splt->contents + code_offset + 10);
1931 return plt_base + code_offset;
1935 /* Relocate an Xtensa ELF section. This is invoked by the linker for
1936 both relocatable and final links. */
1939 elf_xtensa_relocate_section (bfd *output_bfd,
1940 struct bfd_link_info *info,
1942 asection *input_section,
1944 Elf_Internal_Rela *relocs,
1945 Elf_Internal_Sym *local_syms,
1946 asection **local_sections)
1948 struct elf_xtensa_link_hash_table *htab;
1949 Elf_Internal_Shdr *symtab_hdr;
1950 Elf_Internal_Rela *rel;
1951 Elf_Internal_Rela *relend;
1952 struct elf_link_hash_entry **sym_hashes;
1953 property_table_entry *lit_table = 0;
1955 char *error_message = NULL;
1956 bfd_size_type input_size;
1958 if (!xtensa_default_isa)
1959 xtensa_default_isa = xtensa_isa_init (0, 0);
1961 htab = elf_xtensa_hash_table (info);
1962 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1963 sym_hashes = elf_sym_hashes (input_bfd);
1965 if (elf_hash_table (info)->dynamic_sections_created)
1967 ltblsize = xtensa_read_table_entries (input_bfd, input_section,
1968 &lit_table, XTENSA_LIT_SEC_NAME,
1974 input_size = bfd_get_section_limit (input_bfd, input_section);
1977 relend = relocs + input_section->reloc_count;
1978 for (; rel < relend; rel++)
1981 reloc_howto_type *howto;
1982 unsigned long r_symndx;
1983 struct elf_link_hash_entry *h;
1984 Elf_Internal_Sym *sym;
1987 bfd_reloc_status_type r;
1988 bfd_boolean is_weak_undef;
1989 bfd_boolean unresolved_reloc;
1992 r_type = ELF32_R_TYPE (rel->r_info);
1993 if (r_type == (int) R_XTENSA_GNU_VTINHERIT
1994 || r_type == (int) R_XTENSA_GNU_VTENTRY)
1997 if (r_type < 0 || r_type >= (int) R_XTENSA_max)
1999 bfd_set_error (bfd_error_bad_value);
2002 howto = &elf_howto_table[r_type];
2004 r_symndx = ELF32_R_SYM (rel->r_info);
2009 is_weak_undef = FALSE;
2010 unresolved_reloc = FALSE;
2013 if (howto->partial_inplace && !info->relocatable)
2015 /* Because R_XTENSA_32 was made partial_inplace to fix some
2016 problems with DWARF info in partial links, there may be
2017 an addend stored in the contents. Take it out of there
2018 and move it back into the addend field of the reloc. */
2019 rel->r_addend += bfd_get_32 (input_bfd, contents + rel->r_offset);
2020 bfd_put_32 (input_bfd, 0, contents + rel->r_offset);
2023 if (r_symndx < symtab_hdr->sh_info)
2025 sym = local_syms + r_symndx;
2026 sec = local_sections[r_symndx];
2027 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
2031 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2032 r_symndx, symtab_hdr, sym_hashes,
2034 unresolved_reloc, warned);
2037 && !unresolved_reloc
2038 && h->root.type == bfd_link_hash_undefweak)
2039 is_weak_undef = TRUE;
2042 if (sec != NULL && elf_discarded_section (sec))
2044 /* For relocs against symbols from removed linkonce sections,
2045 or sections discarded by a linker script, we just want the
2046 section contents zeroed. Avoid any special processing. */
2047 _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset);
2053 if (info->relocatable)
2055 /* This is a relocatable link.
2056 1) If the reloc is against a section symbol, adjust
2057 according to the output section.
2058 2) If there is a new target for this relocation,
2059 the new target will be in the same output section.
2060 We adjust the relocation by the output section
2063 if (relaxing_section)
2065 /* Check if this references a section in another input file. */
2066 if (!do_fix_for_relocatable_link (rel, input_bfd, input_section,
2071 if (r_type == R_XTENSA_ASM_SIMPLIFY)
2073 char *error_message = NULL;
2074 /* Convert ASM_SIMPLIFY into the simpler relocation
2075 so that they never escape a relaxing link. */
2076 r = contract_asm_expansion (contents, input_size, rel,
2078 if (r != bfd_reloc_ok)
2080 if (!((*info->callbacks->reloc_dangerous)
2081 (info, error_message, input_bfd, input_section,
2085 r_type = ELF32_R_TYPE (rel->r_info);
2088 /* This is a relocatable link, so we don't have to change
2089 anything unless the reloc is against a section symbol,
2090 in which case we have to adjust according to where the
2091 section symbol winds up in the output section. */
2092 if (r_symndx < symtab_hdr->sh_info)
2094 sym = local_syms + r_symndx;
2095 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
2097 sec = local_sections[r_symndx];
2098 rel->r_addend += sec->output_offset + sym->st_value;
2102 /* If there is an addend with a partial_inplace howto,
2103 then move the addend to the contents. This is a hack
2104 to work around problems with DWARF in relocatable links
2105 with some previous version of BFD. Now we can't easily get
2106 rid of the hack without breaking backward compatibility.... */
2109 howto = &elf_howto_table[r_type];
2110 if (howto->partial_inplace)
2112 r = elf_xtensa_do_reloc (howto, input_bfd, input_section,
2113 rel->r_addend, contents,
2114 rel->r_offset, FALSE,
2116 if (r != bfd_reloc_ok)
2118 if (!((*info->callbacks->reloc_dangerous)
2119 (info, error_message, input_bfd, input_section,
2127 /* Done with work for relocatable link; continue with next reloc. */
2131 /* This is a final link. */
2133 if (relaxing_section)
2135 /* Check if this references a section in another input file. */
2136 do_fix_for_final_link (rel, input_bfd, input_section, contents,
2140 /* Sanity check the address. */
2141 if (rel->r_offset >= input_size
2142 && ELF32_R_TYPE (rel->r_info) != R_XTENSA_NONE)
2144 (*_bfd_error_handler)
2145 (_("%B(%A+0x%lx): relocation offset out of range (size=0x%x)"),
2146 input_bfd, input_section, rel->r_offset, input_size);
2147 bfd_set_error (bfd_error_bad_value);
2151 /* Generate dynamic relocations. */
2152 if (elf_hash_table (info)->dynamic_sections_created)
2154 bfd_boolean dynamic_symbol = elf_xtensa_dynamic_symbol_p (h, info);
2156 if (dynamic_symbol && (is_operand_relocation (r_type)
2157 || r_type == R_XTENSA_32_PCREL))
2159 const char *name = h->root.root.string;
2161 vsprint_msg ("invalid relocation for dynamic symbol", ": %s",
2162 strlen (name) + 2, name);
2163 if (!((*info->callbacks->reloc_dangerous)
2164 (info, error_message, input_bfd, input_section,
2168 else if ((r_type == R_XTENSA_32 || r_type == R_XTENSA_PLT)
2169 && (input_section->flags & SEC_ALLOC) != 0
2170 && (dynamic_symbol || info->shared))
2172 Elf_Internal_Rela outrel;
2176 if (dynamic_symbol && r_type == R_XTENSA_PLT)
2177 srel = htab->srelplt;
2179 srel = htab->srelgot;
2181 BFD_ASSERT (srel != NULL);
2184 _bfd_elf_section_offset (output_bfd, info,
2185 input_section, rel->r_offset);
2187 if ((outrel.r_offset | 1) == (bfd_vma) -1)
2188 memset (&outrel, 0, sizeof outrel);
2191 outrel.r_offset += (input_section->output_section->vma
2192 + input_section->output_offset);
2194 /* Complain if the relocation is in a read-only section
2195 and not in a literal pool. */
2196 if ((input_section->flags & SEC_READONLY) != 0
2197 && !elf_xtensa_in_literal_pool (lit_table, ltblsize,
2201 _("dynamic relocation in read-only section");
2202 if (!((*info->callbacks->reloc_dangerous)
2203 (info, error_message, input_bfd, input_section,
2210 outrel.r_addend = rel->r_addend;
2213 if (r_type == R_XTENSA_32)
2216 ELF32_R_INFO (h->dynindx, R_XTENSA_GLOB_DAT);
2219 else /* r_type == R_XTENSA_PLT */
2222 ELF32_R_INFO (h->dynindx, R_XTENSA_JMP_SLOT);
2224 /* Create the PLT entry and set the initial
2225 contents of the literal entry to the address of
2228 elf_xtensa_create_plt_entry (info, output_bfd,
2231 unresolved_reloc = FALSE;
2235 /* Generate a RELATIVE relocation. */
2236 outrel.r_info = ELF32_R_INFO (0, R_XTENSA_RELATIVE);
2237 outrel.r_addend = 0;
2241 loc = (srel->contents
2242 + srel->reloc_count++ * sizeof (Elf32_External_Rela));
2243 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2244 BFD_ASSERT (sizeof (Elf32_External_Rela) * srel->reloc_count
2249 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
2250 because such sections are not SEC_ALLOC and thus ld.so will
2251 not process them. */
2252 if (unresolved_reloc
2253 && !((input_section->flags & SEC_DEBUGGING) != 0
2256 (*_bfd_error_handler)
2257 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
2260 (long) rel->r_offset,
2262 h->root.root.string);
2266 /* There's no point in calling bfd_perform_relocation here.
2267 Just go directly to our "special function". */
2268 r = elf_xtensa_do_reloc (howto, input_bfd, input_section,
2269 relocation + rel->r_addend,
2270 contents, rel->r_offset, is_weak_undef,
2273 if (r != bfd_reloc_ok && !warned)
2277 BFD_ASSERT (r == bfd_reloc_dangerous || r == bfd_reloc_other);
2278 BFD_ASSERT (error_message != NULL);
2281 name = h->root.root.string;
2284 name = bfd_elf_string_from_elf_section
2285 (input_bfd, symtab_hdr->sh_link, sym->st_name);
2286 if (name && *name == '\0')
2287 name = bfd_section_name (input_bfd, sec);
2291 if (rel->r_addend == 0)
2292 error_message = vsprint_msg (error_message, ": %s",
2293 strlen (name) + 2, name);
2295 error_message = vsprint_msg (error_message, ": (%s+0x%x)",
2297 name, (int)rel->r_addend);
2300 if (!((*info->callbacks->reloc_dangerous)
2301 (info, error_message, input_bfd, input_section,
2310 input_section->reloc_done = TRUE;
2316 /* Finish up dynamic symbol handling. There's not much to do here since
2317 the PLT and GOT entries are all set up by relocate_section. */
2320 elf_xtensa_finish_dynamic_symbol (bfd *output_bfd ATTRIBUTE_UNUSED,
2321 struct bfd_link_info *info ATTRIBUTE_UNUSED,
2322 struct elf_link_hash_entry *h,
2323 Elf_Internal_Sym *sym)
2325 if (h->needs_plt && !h->def_regular)
2327 /* Mark the symbol as undefined, rather than as defined in
2328 the .plt section. Leave the value alone. */
2329 sym->st_shndx = SHN_UNDEF;
2330 /* If the symbol is weak, we do need to clear the value.
2331 Otherwise, the PLT entry would provide a definition for
2332 the symbol even if the symbol wasn't defined anywhere,
2333 and so the symbol would never be NULL. */
2334 if (!h->ref_regular_nonweak)
2338 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
2339 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
2340 || h == elf_hash_table (info)->hgot)
2341 sym->st_shndx = SHN_ABS;
2347 /* Combine adjacent literal table entries in the output. Adjacent
2348 entries within each input section may have been removed during
2349 relaxation, but we repeat the process here, even though it's too late
2350 to shrink the output section, because it's important to minimize the
2351 number of literal table entries to reduce the start-up work for the
2352 runtime linker. Returns the number of remaining table entries or -1
2356 elf_xtensa_combine_prop_entries (bfd *output_bfd,
2361 property_table_entry *table;
2362 bfd_size_type section_size, sgotloc_size;
2366 section_size = sxtlit->size;
2367 BFD_ASSERT (section_size % 8 == 0);
2368 num = section_size / 8;
2370 sgotloc_size = sgotloc->size;
2371 if (sgotloc_size != section_size)
2373 (*_bfd_error_handler)
2374 (_("internal inconsistency in size of .got.loc section"));
2378 table = bfd_malloc (num * sizeof (property_table_entry));
2382 /* The ".xt.lit.plt" section has the SEC_IN_MEMORY flag set and this
2383 propagates to the output section, where it doesn't really apply and
2384 where it breaks the following call to bfd_malloc_and_get_section. */
2385 sxtlit->flags &= ~SEC_IN_MEMORY;
2387 if (!bfd_malloc_and_get_section (output_bfd, sxtlit, &contents))
2395 /* There should never be any relocations left at this point, so this
2396 is quite a bit easier than what is done during relaxation. */
2398 /* Copy the raw contents into a property table array and sort it. */
2400 for (n = 0; n < num; n++)
2402 table[n].address = bfd_get_32 (output_bfd, &contents[offset]);
2403 table[n].size = bfd_get_32 (output_bfd, &contents[offset + 4]);
2406 qsort (table, num, sizeof (property_table_entry), property_table_compare);
2408 for (n = 0; n < num; n++)
2410 bfd_boolean remove = FALSE;
2412 if (table[n].size == 0)
2415 (table[n-1].address + table[n-1].size == table[n].address))
2417 table[n-1].size += table[n].size;
2423 for (m = n; m < num - 1; m++)
2425 table[m].address = table[m+1].address;
2426 table[m].size = table[m+1].size;
2434 /* Copy the data back to the raw contents. */
2436 for (n = 0; n < num; n++)
2438 bfd_put_32 (output_bfd, table[n].address, &contents[offset]);
2439 bfd_put_32 (output_bfd, table[n].size, &contents[offset + 4]);
2443 /* Clear the removed bytes. */
2444 if ((bfd_size_type) (num * 8) < section_size)
2445 memset (&contents[num * 8], 0, section_size - num * 8);
2447 if (! bfd_set_section_contents (output_bfd, sxtlit, contents, 0,
2451 /* Copy the contents to ".got.loc". */
2452 memcpy (sgotloc->contents, contents, section_size);
2460 /* Finish up the dynamic sections. */
2463 elf_xtensa_finish_dynamic_sections (bfd *output_bfd,
2464 struct bfd_link_info *info)
2466 struct elf_xtensa_link_hash_table *htab;
2468 asection *sdyn, *srelplt, *sgot, *sxtlit, *sgotloc;
2469 Elf32_External_Dyn *dyncon, *dynconend;
2470 int num_xtlit_entries;
2472 if (! elf_hash_table (info)->dynamic_sections_created)
2475 htab = elf_xtensa_hash_table (info);
2476 dynobj = elf_hash_table (info)->dynobj;
2477 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
2478 BFD_ASSERT (sdyn != NULL);
2480 /* Set the first entry in the global offset table to the address of
2481 the dynamic section. */
2485 BFD_ASSERT (sgot->size == 4);
2487 bfd_put_32 (output_bfd, 0, sgot->contents);
2489 bfd_put_32 (output_bfd,
2490 sdyn->output_section->vma + sdyn->output_offset,
2494 srelplt = htab->srelplt;
2495 if (srelplt && srelplt->size != 0)
2497 asection *sgotplt, *srelgot, *spltlittbl;
2498 int chunk, plt_chunks, plt_entries;
2499 Elf_Internal_Rela irela;
2501 unsigned rtld_reloc;
2503 srelgot = htab->srelgot;
2504 spltlittbl = htab->spltlittbl;
2505 BFD_ASSERT (srelgot != NULL && spltlittbl != NULL);
2507 /* Find the first XTENSA_RTLD relocation. Presumably the rest
2508 of them follow immediately after.... */
2509 for (rtld_reloc = 0; rtld_reloc < srelgot->reloc_count; rtld_reloc++)
2511 loc = srelgot->contents + rtld_reloc * sizeof (Elf32_External_Rela);
2512 bfd_elf32_swap_reloca_in (output_bfd, loc, &irela);
2513 if (ELF32_R_TYPE (irela.r_info) == R_XTENSA_RTLD)
2516 BFD_ASSERT (rtld_reloc < srelgot->reloc_count);
2518 plt_entries = srelplt->size / sizeof (Elf32_External_Rela);
2520 (plt_entries + PLT_ENTRIES_PER_CHUNK - 1) / PLT_ENTRIES_PER_CHUNK;
2522 for (chunk = 0; chunk < plt_chunks; chunk++)
2524 int chunk_entries = 0;
2526 sgotplt = elf_xtensa_get_gotplt_section (info, chunk);
2527 BFD_ASSERT (sgotplt != NULL);
2529 /* Emit special RTLD relocations for the first two entries in
2530 each chunk of the .got.plt section. */
2532 loc = srelgot->contents + rtld_reloc * sizeof (Elf32_External_Rela);
2533 bfd_elf32_swap_reloca_in (output_bfd, loc, &irela);
2534 BFD_ASSERT (ELF32_R_TYPE (irela.r_info) == R_XTENSA_RTLD);
2535 irela.r_offset = (sgotplt->output_section->vma
2536 + sgotplt->output_offset);
2537 irela.r_addend = 1; /* tell rtld to set value to resolver function */
2538 bfd_elf32_swap_reloca_out (output_bfd, &irela, loc);
2540 BFD_ASSERT (rtld_reloc <= srelgot->reloc_count);
2542 /* Next literal immediately follows the first. */
2543 loc += sizeof (Elf32_External_Rela);
2544 bfd_elf32_swap_reloca_in (output_bfd, loc, &irela);
2545 BFD_ASSERT (ELF32_R_TYPE (irela.r_info) == R_XTENSA_RTLD);
2546 irela.r_offset = (sgotplt->output_section->vma
2547 + sgotplt->output_offset + 4);
2548 /* Tell rtld to set value to object's link map. */
2550 bfd_elf32_swap_reloca_out (output_bfd, &irela, loc);
2552 BFD_ASSERT (rtld_reloc <= srelgot->reloc_count);
2554 /* Fill in the literal table. */
2555 if (chunk < plt_chunks - 1)
2556 chunk_entries = PLT_ENTRIES_PER_CHUNK;
2558 chunk_entries = plt_entries - (chunk * PLT_ENTRIES_PER_CHUNK);
2560 BFD_ASSERT ((unsigned) (chunk + 1) * 8 <= spltlittbl->size);
2561 bfd_put_32 (output_bfd,
2562 sgotplt->output_section->vma + sgotplt->output_offset,
2563 spltlittbl->contents + (chunk * 8) + 0);
2564 bfd_put_32 (output_bfd,
2565 8 + (chunk_entries * 4),
2566 spltlittbl->contents + (chunk * 8) + 4);
2569 /* All the dynamic relocations have been emitted at this point.
2570 Make sure the relocation sections are the correct size. */
2571 if (srelgot->size != (sizeof (Elf32_External_Rela)
2572 * srelgot->reloc_count)
2573 || srelplt->size != (sizeof (Elf32_External_Rela)
2574 * srelplt->reloc_count))
2577 /* The .xt.lit.plt section has just been modified. This must
2578 happen before the code below which combines adjacent literal
2579 table entries, and the .xt.lit.plt contents have to be forced to
2581 if (! bfd_set_section_contents (output_bfd,
2582 spltlittbl->output_section,
2583 spltlittbl->contents,
2584 spltlittbl->output_offset,
2587 /* Clear SEC_HAS_CONTENTS so the contents won't be output again. */
2588 spltlittbl->flags &= ~SEC_HAS_CONTENTS;
2591 /* Combine adjacent literal table entries. */
2592 BFD_ASSERT (! info->relocatable);
2593 sxtlit = bfd_get_section_by_name (output_bfd, ".xt.lit");
2594 sgotloc = htab->sgotloc;
2595 BFD_ASSERT (sxtlit && sgotloc);
2597 elf_xtensa_combine_prop_entries (output_bfd, sxtlit, sgotloc);
2598 if (num_xtlit_entries < 0)
2601 dyncon = (Elf32_External_Dyn *) sdyn->contents;
2602 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
2603 for (; dyncon < dynconend; dyncon++)
2605 Elf_Internal_Dyn dyn;
2607 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
2614 case DT_XTENSA_GOT_LOC_SZ:
2615 dyn.d_un.d_val = num_xtlit_entries;
2618 case DT_XTENSA_GOT_LOC_OFF:
2619 dyn.d_un.d_ptr = htab->sgotloc->output_section->vma;
2623 dyn.d_un.d_ptr = htab->sgot->output_section->vma;
2627 dyn.d_un.d_ptr = htab->srelplt->output_section->vma;
2631 dyn.d_un.d_val = htab->srelplt->output_section->size;
2635 /* Adjust RELASZ to not include JMPREL. This matches what
2636 glibc expects and what is done for several other ELF
2637 targets (e.g., i386, alpha), but the "correct" behavior
2638 seems to be unresolved. Since the linker script arranges
2639 for .rela.plt to follow all other relocation sections, we
2640 don't have to worry about changing the DT_RELA entry. */
2642 dyn.d_un.d_val -= htab->srelplt->output_section->size;
2646 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2653 /* Functions for dealing with the e_flags field. */
2655 /* Merge backend specific data from an object file to the output
2656 object file when linking. */
2659 elf_xtensa_merge_private_bfd_data (bfd *ibfd, bfd *obfd)
2661 unsigned out_mach, in_mach;
2662 flagword out_flag, in_flag;
2664 /* Check if we have the same endianess. */
2665 if (!_bfd_generic_verify_endian_match (ibfd, obfd))
2668 /* Don't even pretend to support mixed-format linking. */
2669 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
2670 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
2673 out_flag = elf_elfheader (obfd)->e_flags;
2674 in_flag = elf_elfheader (ibfd)->e_flags;
2676 out_mach = out_flag & EF_XTENSA_MACH;
2677 in_mach = in_flag & EF_XTENSA_MACH;
2678 if (out_mach != in_mach)
2680 (*_bfd_error_handler)
2681 (_("%B: incompatible machine type. Output is 0x%x. Input is 0x%x"),
2682 ibfd, out_mach, in_mach);
2683 bfd_set_error (bfd_error_wrong_format);
2687 if (! elf_flags_init (obfd))
2689 elf_flags_init (obfd) = TRUE;
2690 elf_elfheader (obfd)->e_flags = in_flag;
2692 if (bfd_get_arch (obfd) == bfd_get_arch (ibfd)
2693 && bfd_get_arch_info (obfd)->the_default)
2694 return bfd_set_arch_mach (obfd, bfd_get_arch (ibfd),
2695 bfd_get_mach (ibfd));
2700 if ((out_flag & EF_XTENSA_XT_INSN) != (in_flag & EF_XTENSA_XT_INSN))
2701 elf_elfheader (obfd)->e_flags &= (~ EF_XTENSA_XT_INSN);
2703 if ((out_flag & EF_XTENSA_XT_LIT) != (in_flag & EF_XTENSA_XT_LIT))
2704 elf_elfheader (obfd)->e_flags &= (~ EF_XTENSA_XT_LIT);
2711 elf_xtensa_set_private_flags (bfd *abfd, flagword flags)
2713 BFD_ASSERT (!elf_flags_init (abfd)
2714 || elf_elfheader (abfd)->e_flags == flags);
2716 elf_elfheader (abfd)->e_flags |= flags;
2717 elf_flags_init (abfd) = TRUE;
2724 elf_xtensa_print_private_bfd_data (bfd *abfd, void *farg)
2726 FILE *f = (FILE *) farg;
2727 flagword e_flags = elf_elfheader (abfd)->e_flags;
2729 fprintf (f, "\nXtensa header:\n");
2730 if ((e_flags & EF_XTENSA_MACH) == E_XTENSA_MACH)
2731 fprintf (f, "\nMachine = Base\n");
2733 fprintf (f, "\nMachine Id = 0x%x\n", e_flags & EF_XTENSA_MACH);
2735 fprintf (f, "Insn tables = %s\n",
2736 (e_flags & EF_XTENSA_XT_INSN) ? "true" : "false");
2738 fprintf (f, "Literal tables = %s\n",
2739 (e_flags & EF_XTENSA_XT_LIT) ? "true" : "false");
2741 return _bfd_elf_print_private_bfd_data (abfd, farg);
2745 /* Set the right machine number for an Xtensa ELF file. */
2748 elf_xtensa_object_p (bfd *abfd)
2751 unsigned long arch = elf_elfheader (abfd)->e_flags & EF_XTENSA_MACH;
2756 mach = bfd_mach_xtensa;
2762 (void) bfd_default_set_arch_mach (abfd, bfd_arch_xtensa, mach);
2767 /* The final processing done just before writing out an Xtensa ELF object
2768 file. This gets the Xtensa architecture right based on the machine
2772 elf_xtensa_final_write_processing (bfd *abfd,
2773 bfd_boolean linker ATTRIBUTE_UNUSED)
2778 switch (mach = bfd_get_mach (abfd))
2780 case bfd_mach_xtensa:
2781 val = E_XTENSA_MACH;
2787 elf_elfheader (abfd)->e_flags &= (~ EF_XTENSA_MACH);
2788 elf_elfheader (abfd)->e_flags |= val;
2792 static enum elf_reloc_type_class
2793 elf_xtensa_reloc_type_class (const Elf_Internal_Rela *rela)
2795 switch ((int) ELF32_R_TYPE (rela->r_info))
2797 case R_XTENSA_RELATIVE:
2798 return reloc_class_relative;
2799 case R_XTENSA_JMP_SLOT:
2800 return reloc_class_plt;
2802 return reloc_class_normal;
2808 elf_xtensa_discard_info_for_section (bfd *abfd,
2809 struct elf_reloc_cookie *cookie,
2810 struct bfd_link_info *info,
2814 bfd_vma offset, actual_offset;
2815 bfd_size_type removed_bytes = 0;
2816 bfd_size_type entry_size;
2818 if (sec->output_section
2819 && bfd_is_abs_section (sec->output_section))
2822 if (xtensa_is_proptable_section (sec))
2827 if (sec->size == 0 || sec->size % entry_size != 0)
2830 contents = retrieve_contents (abfd, sec, info->keep_memory);
2834 cookie->rels = retrieve_internal_relocs (abfd, sec, info->keep_memory);
2837 release_contents (sec, contents);
2841 /* Sort the relocations. They should already be in order when
2842 relaxation is enabled, but it might not be. */
2843 qsort (cookie->rels, sec->reloc_count, sizeof (Elf_Internal_Rela),
2844 internal_reloc_compare);
2846 cookie->rel = cookie->rels;
2847 cookie->relend = cookie->rels + sec->reloc_count;
2849 for (offset = 0; offset < sec->size; offset += entry_size)
2851 actual_offset = offset - removed_bytes;
2853 /* The ...symbol_deleted_p function will skip over relocs but it
2854 won't adjust their offsets, so do that here. */
2855 while (cookie->rel < cookie->relend
2856 && cookie->rel->r_offset < offset)
2858 cookie->rel->r_offset -= removed_bytes;
2862 while (cookie->rel < cookie->relend
2863 && cookie->rel->r_offset == offset)
2865 if (bfd_elf_reloc_symbol_deleted_p (offset, cookie))
2867 /* Remove the table entry. (If the reloc type is NONE, then
2868 the entry has already been merged with another and deleted
2869 during relaxation.) */
2870 if (ELF32_R_TYPE (cookie->rel->r_info) != R_XTENSA_NONE)
2872 /* Shift the contents up. */
2873 if (offset + entry_size < sec->size)
2874 memmove (&contents[actual_offset],
2875 &contents[actual_offset + entry_size],
2876 sec->size - offset - entry_size);
2877 removed_bytes += entry_size;
2880 /* Remove this relocation. */
2881 cookie->rel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
2884 /* Adjust the relocation offset for previous removals. This
2885 should not be done before calling ...symbol_deleted_p
2886 because it might mess up the offset comparisons there.
2887 Make sure the offset doesn't underflow in the case where
2888 the first entry is removed. */
2889 if (cookie->rel->r_offset >= removed_bytes)
2890 cookie->rel->r_offset -= removed_bytes;
2892 cookie->rel->r_offset = 0;
2898 if (removed_bytes != 0)
2900 /* Adjust any remaining relocs (shouldn't be any). */
2901 for (; cookie->rel < cookie->relend; cookie->rel++)
2903 if (cookie->rel->r_offset >= removed_bytes)
2904 cookie->rel->r_offset -= removed_bytes;
2906 cookie->rel->r_offset = 0;
2909 /* Clear the removed bytes. */
2910 memset (&contents[sec->size - removed_bytes], 0, removed_bytes);
2912 pin_contents (sec, contents);
2913 pin_internal_relocs (sec, cookie->rels);
2916 if (sec->rawsize == 0)
2917 sec->rawsize = sec->size;
2918 sec->size -= removed_bytes;
2920 if (xtensa_is_littable_section (sec))
2922 asection *sgotloc = elf_xtensa_hash_table (info)->sgotloc;
2924 sgotloc->size -= removed_bytes;
2929 release_contents (sec, contents);
2930 release_internal_relocs (sec, cookie->rels);
2933 return (removed_bytes != 0);
2938 elf_xtensa_discard_info (bfd *abfd,
2939 struct elf_reloc_cookie *cookie,
2940 struct bfd_link_info *info)
2943 bfd_boolean changed = FALSE;
2945 for (sec = abfd->sections; sec != NULL; sec = sec->next)
2947 if (xtensa_is_property_section (sec))
2949 if (elf_xtensa_discard_info_for_section (abfd, cookie, info, sec))
2959 elf_xtensa_ignore_discarded_relocs (asection *sec)
2961 return xtensa_is_property_section (sec);
2966 elf_xtensa_action_discarded (asection *sec)
2968 if (strcmp (".xt_except_table", sec->name) == 0)
2971 if (strcmp (".xt_except_desc", sec->name) == 0)
2974 return _bfd_elf_default_action_discarded (sec);
2978 /* Support for core dump NOTE sections. */
2981 elf_xtensa_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
2986 /* The size for Xtensa is variable, so don't try to recognize the format
2987 based on the size. Just assume this is GNU/Linux. */
2990 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12);
2993 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24);
2997 size = note->descsz - offset - 4;
2999 /* Make a ".reg/999" section. */
3000 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
3001 size, note->descpos + offset);
3006 elf_xtensa_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
3008 switch (note->descsz)
3013 case 128: /* GNU/Linux elf_prpsinfo */
3014 elf_tdata (abfd)->core_program
3015 = _bfd_elfcore_strndup (abfd, note->descdata + 32, 16);
3016 elf_tdata (abfd)->core_command
3017 = _bfd_elfcore_strndup (abfd, note->descdata + 48, 80);
3020 /* Note that for some reason, a spurious space is tacked
3021 onto the end of the args in some (at least one anyway)
3022 implementations, so strip it off if it exists. */
3025 char *command = elf_tdata (abfd)->core_command;
3026 int n = strlen (command);
3028 if (0 < n && command[n - 1] == ' ')
3029 command[n - 1] = '\0';
3036 /* Generic Xtensa configurability stuff. */
3038 static xtensa_opcode callx0_op = XTENSA_UNDEFINED;
3039 static xtensa_opcode callx4_op = XTENSA_UNDEFINED;
3040 static xtensa_opcode callx8_op = XTENSA_UNDEFINED;
3041 static xtensa_opcode callx12_op = XTENSA_UNDEFINED;
3042 static xtensa_opcode call0_op = XTENSA_UNDEFINED;
3043 static xtensa_opcode call4_op = XTENSA_UNDEFINED;
3044 static xtensa_opcode call8_op = XTENSA_UNDEFINED;
3045 static xtensa_opcode call12_op = XTENSA_UNDEFINED;
3048 init_call_opcodes (void)
3050 if (callx0_op == XTENSA_UNDEFINED)
3052 callx0_op = xtensa_opcode_lookup (xtensa_default_isa, "callx0");
3053 callx4_op = xtensa_opcode_lookup (xtensa_default_isa, "callx4");
3054 callx8_op = xtensa_opcode_lookup (xtensa_default_isa, "callx8");
3055 callx12_op = xtensa_opcode_lookup (xtensa_default_isa, "callx12");
3056 call0_op = xtensa_opcode_lookup (xtensa_default_isa, "call0");
3057 call4_op = xtensa_opcode_lookup (xtensa_default_isa, "call4");
3058 call8_op = xtensa_opcode_lookup (xtensa_default_isa, "call8");
3059 call12_op = xtensa_opcode_lookup (xtensa_default_isa, "call12");
3065 is_indirect_call_opcode (xtensa_opcode opcode)
3067 init_call_opcodes ();
3068 return (opcode == callx0_op
3069 || opcode == callx4_op
3070 || opcode == callx8_op
3071 || opcode == callx12_op);
3076 is_direct_call_opcode (xtensa_opcode opcode)
3078 init_call_opcodes ();
3079 return (opcode == call0_op
3080 || opcode == call4_op
3081 || opcode == call8_op
3082 || opcode == call12_op);
3087 is_windowed_call_opcode (xtensa_opcode opcode)
3089 init_call_opcodes ();
3090 return (opcode == call4_op
3091 || opcode == call8_op
3092 || opcode == call12_op
3093 || opcode == callx4_op
3094 || opcode == callx8_op
3095 || opcode == callx12_op);
3099 static xtensa_opcode
3100 get_const16_opcode (void)
3102 static bfd_boolean done_lookup = FALSE;
3103 static xtensa_opcode const16_opcode = XTENSA_UNDEFINED;
3106 const16_opcode = xtensa_opcode_lookup (xtensa_default_isa, "const16");
3109 return const16_opcode;
3113 static xtensa_opcode
3114 get_l32r_opcode (void)
3116 static xtensa_opcode l32r_opcode = XTENSA_UNDEFINED;
3117 static bfd_boolean done_lookup = FALSE;
3121 l32r_opcode = xtensa_opcode_lookup (xtensa_default_isa, "l32r");
3129 l32r_offset (bfd_vma addr, bfd_vma pc)
3133 offset = addr - ((pc+3) & -4);
3134 BFD_ASSERT ((offset & ((1 << 2) - 1)) == 0);
3135 offset = (signed int) offset >> 2;
3136 BFD_ASSERT ((signed int) offset >> 16 == -1);
3142 get_relocation_opnd (xtensa_opcode opcode, int r_type)
3144 xtensa_isa isa = xtensa_default_isa;
3145 int last_immed, last_opnd, opi;
3147 if (opcode == XTENSA_UNDEFINED)
3148 return XTENSA_UNDEFINED;
3150 /* Find the last visible PC-relative immediate operand for the opcode.
3151 If there are no PC-relative immediates, then choose the last visible
3152 immediate; otherwise, fail and return XTENSA_UNDEFINED. */
3153 last_immed = XTENSA_UNDEFINED;
3154 last_opnd = xtensa_opcode_num_operands (isa, opcode);
3155 for (opi = last_opnd - 1; opi >= 0; opi--)
3157 if (xtensa_operand_is_visible (isa, opcode, opi) == 0)
3159 if (xtensa_operand_is_PCrelative (isa, opcode, opi) == 1)
3164 if (last_immed == XTENSA_UNDEFINED
3165 && xtensa_operand_is_register (isa, opcode, opi) == 0)
3169 return XTENSA_UNDEFINED;
3171 /* If the operand number was specified in an old-style relocation,
3172 check for consistency with the operand computed above. */
3173 if (r_type >= R_XTENSA_OP0 && r_type <= R_XTENSA_OP2)
3175 int reloc_opnd = r_type - R_XTENSA_OP0;
3176 if (reloc_opnd != last_immed)
3177 return XTENSA_UNDEFINED;
3185 get_relocation_slot (int r_type)
3195 if (r_type >= R_XTENSA_SLOT0_OP && r_type <= R_XTENSA_SLOT14_OP)
3196 return r_type - R_XTENSA_SLOT0_OP;
3197 if (r_type >= R_XTENSA_SLOT0_ALT && r_type <= R_XTENSA_SLOT14_ALT)
3198 return r_type - R_XTENSA_SLOT0_ALT;
3202 return XTENSA_UNDEFINED;
3206 /* Get the opcode for a relocation. */
3208 static xtensa_opcode
3209 get_relocation_opcode (bfd *abfd,
3212 Elf_Internal_Rela *irel)
3214 static xtensa_insnbuf ibuff = NULL;
3215 static xtensa_insnbuf sbuff = NULL;
3216 xtensa_isa isa = xtensa_default_isa;
3220 if (contents == NULL)
3221 return XTENSA_UNDEFINED;
3223 if (bfd_get_section_limit (abfd, sec) <= irel->r_offset)
3224 return XTENSA_UNDEFINED;
3228 ibuff = xtensa_insnbuf_alloc (isa);
3229 sbuff = xtensa_insnbuf_alloc (isa);
3232 /* Decode the instruction. */
3233 xtensa_insnbuf_from_chars (isa, ibuff, &contents[irel->r_offset],
3234 sec->size - irel->r_offset);
3235 fmt = xtensa_format_decode (isa, ibuff);
3236 slot = get_relocation_slot (ELF32_R_TYPE (irel->r_info));
3237 if (slot == XTENSA_UNDEFINED)
3238 return XTENSA_UNDEFINED;
3239 xtensa_format_get_slot (isa, fmt, slot, ibuff, sbuff);
3240 return xtensa_opcode_decode (isa, fmt, slot, sbuff);
3245 is_l32r_relocation (bfd *abfd,
3248 Elf_Internal_Rela *irel)
3250 xtensa_opcode opcode;
3251 if (!is_operand_relocation (ELF32_R_TYPE (irel->r_info)))
3253 opcode = get_relocation_opcode (abfd, sec, contents, irel);
3254 return (opcode == get_l32r_opcode ());
3258 static bfd_size_type
3259 get_asm_simplify_size (bfd_byte *contents,
3260 bfd_size_type content_len,
3261 bfd_size_type offset)
3263 bfd_size_type insnlen, size = 0;
3265 /* Decode the size of the next two instructions. */
3266 insnlen = insn_decode_len (contents, content_len, offset);
3272 insnlen = insn_decode_len (contents, content_len, offset + size);
3282 is_alt_relocation (int r_type)
3284 return (r_type >= R_XTENSA_SLOT0_ALT
3285 && r_type <= R_XTENSA_SLOT14_ALT);
3290 is_operand_relocation (int r_type)
3300 if (r_type >= R_XTENSA_SLOT0_OP && r_type <= R_XTENSA_SLOT14_OP)
3302 if (r_type >= R_XTENSA_SLOT0_ALT && r_type <= R_XTENSA_SLOT14_ALT)
3311 #define MIN_INSN_LENGTH 2
3313 /* Return 0 if it fails to decode. */
3316 insn_decode_len (bfd_byte *contents,
3317 bfd_size_type content_len,
3318 bfd_size_type offset)
3321 xtensa_isa isa = xtensa_default_isa;
3323 static xtensa_insnbuf ibuff = NULL;
3325 if (offset + MIN_INSN_LENGTH > content_len)
3329 ibuff = xtensa_insnbuf_alloc (isa);
3330 xtensa_insnbuf_from_chars (isa, ibuff, &contents[offset],
3331 content_len - offset);
3332 fmt = xtensa_format_decode (isa, ibuff);
3333 if (fmt == XTENSA_UNDEFINED)
3335 insn_len = xtensa_format_length (isa, fmt);
3336 if (insn_len == XTENSA_UNDEFINED)
3342 /* Decode the opcode for a single slot instruction.
3343 Return 0 if it fails to decode or the instruction is multi-slot. */
3346 insn_decode_opcode (bfd_byte *contents,
3347 bfd_size_type content_len,
3348 bfd_size_type offset,
3351 xtensa_isa isa = xtensa_default_isa;
3353 static xtensa_insnbuf insnbuf = NULL;
3354 static xtensa_insnbuf slotbuf = NULL;
3356 if (offset + MIN_INSN_LENGTH > content_len)
3357 return XTENSA_UNDEFINED;
3359 if (insnbuf == NULL)
3361 insnbuf = xtensa_insnbuf_alloc (isa);
3362 slotbuf = xtensa_insnbuf_alloc (isa);
3365 xtensa_insnbuf_from_chars (isa, insnbuf, &contents[offset],
3366 content_len - offset);
3367 fmt = xtensa_format_decode (isa, insnbuf);
3368 if (fmt == XTENSA_UNDEFINED)
3369 return XTENSA_UNDEFINED;
3371 if (slot >= xtensa_format_num_slots (isa, fmt))
3372 return XTENSA_UNDEFINED;
3374 xtensa_format_get_slot (isa, fmt, slot, insnbuf, slotbuf);
3375 return xtensa_opcode_decode (isa, fmt, slot, slotbuf);
3379 /* The offset is the offset in the contents.
3380 The address is the address of that offset. */
3383 check_branch_target_aligned (bfd_byte *contents,
3384 bfd_size_type content_length,
3388 bfd_size_type insn_len = insn_decode_len (contents, content_length, offset);
3391 return check_branch_target_aligned_address (address, insn_len);
3396 check_loop_aligned (bfd_byte *contents,
3397 bfd_size_type content_length,
3401 bfd_size_type loop_len, insn_len;
3402 xtensa_opcode opcode;
3404 opcode = insn_decode_opcode (contents, content_length, offset, 0);
3405 if (opcode == XTENSA_UNDEFINED
3406 || xtensa_opcode_is_loop (xtensa_default_isa, opcode) != 1)
3412 loop_len = insn_decode_len (contents, content_length, offset);
3413 insn_len = insn_decode_len (contents, content_length, offset + loop_len);
3414 if (loop_len == 0 || insn_len == 0)
3420 return check_branch_target_aligned_address (address + loop_len, insn_len);
3425 check_branch_target_aligned_address (bfd_vma addr, int len)
3428 return (addr % 8 == 0);
3429 return ((addr >> 2) == ((addr + len - 1) >> 2));
3433 /* Instruction widening and narrowing. */
3435 /* When FLIX is available we need to access certain instructions only
3436 when they are 16-bit or 24-bit instructions. This table caches
3437 information about such instructions by walking through all the
3438 opcodes and finding the smallest single-slot format into which each
3441 static xtensa_format *op_single_fmt_table = NULL;
3445 init_op_single_format_table (void)
3447 xtensa_isa isa = xtensa_default_isa;
3448 xtensa_insnbuf ibuf;
3449 xtensa_opcode opcode;
3453 if (op_single_fmt_table)
3456 ibuf = xtensa_insnbuf_alloc (isa);
3457 num_opcodes = xtensa_isa_num_opcodes (isa);
3459 op_single_fmt_table = (xtensa_format *)
3460 bfd_malloc (sizeof (xtensa_format) * num_opcodes);
3461 for (opcode = 0; opcode < num_opcodes; opcode++)
3463 op_single_fmt_table[opcode] = XTENSA_UNDEFINED;
3464 for (fmt = 0; fmt < xtensa_isa_num_formats (isa); fmt++)
3466 if (xtensa_format_num_slots (isa, fmt) == 1
3467 && xtensa_opcode_encode (isa, fmt, 0, ibuf, opcode) == 0)
3469 xtensa_opcode old_fmt = op_single_fmt_table[opcode];
3470 int fmt_length = xtensa_format_length (isa, fmt);
3471 if (old_fmt == XTENSA_UNDEFINED
3472 || fmt_length < xtensa_format_length (isa, old_fmt))
3473 op_single_fmt_table[opcode] = fmt;
3477 xtensa_insnbuf_free (isa, ibuf);
3481 static xtensa_format
3482 get_single_format (xtensa_opcode opcode)
3484 init_op_single_format_table ();
3485 return op_single_fmt_table[opcode];
3489 /* For the set of narrowable instructions we do NOT include the
3490 narrowings beqz -> beqz.n or bnez -> bnez.n because of complexities
3491 involved during linker relaxation that may require these to
3492 re-expand in some conditions. Also, the narrowing "or" -> mov.n
3493 requires special case code to ensure it only works when op1 == op2. */
3501 struct string_pair narrowable[] =
3504 { "addi", "addi.n" },
3505 { "addmi", "addi.n" },
3506 { "l32i", "l32i.n" },
3507 { "movi", "movi.n" },
3509 { "retw", "retw.n" },
3510 { "s32i", "s32i.n" },
3511 { "or", "mov.n" } /* special case only when op1 == op2 */
3514 struct string_pair widenable[] =
3517 { "addi", "addi.n" },
3518 { "addmi", "addi.n" },
3519 { "beqz", "beqz.n" },
3520 { "bnez", "bnez.n" },
3521 { "l32i", "l32i.n" },
3522 { "movi", "movi.n" },
3524 { "retw", "retw.n" },
3525 { "s32i", "s32i.n" },
3526 { "or", "mov.n" } /* special case only when op1 == op2 */
3530 /* Check if an instruction can be "narrowed", i.e., changed from a standard
3531 3-byte instruction to a 2-byte "density" instruction. If it is valid,
3532 return the instruction buffer holding the narrow instruction. Otherwise,
3533 return 0. The set of valid narrowing are specified by a string table
3534 but require some special case operand checks in some cases. */
3536 static xtensa_insnbuf
3537 can_narrow_instruction (xtensa_insnbuf slotbuf,
3539 xtensa_opcode opcode)
3541 xtensa_isa isa = xtensa_default_isa;
3542 xtensa_format o_fmt;
3545 static xtensa_insnbuf o_insnbuf = NULL;
3546 static xtensa_insnbuf o_slotbuf = NULL;
3548 if (o_insnbuf == NULL)
3550 o_insnbuf = xtensa_insnbuf_alloc (isa);
3551 o_slotbuf = xtensa_insnbuf_alloc (isa);
3554 for (opi = 0; opi < (sizeof (narrowable)/sizeof (struct string_pair)); opi++)
3556 bfd_boolean is_or = (strcmp ("or", narrowable[opi].wide) == 0);
3558 if (opcode == xtensa_opcode_lookup (isa, narrowable[opi].wide))
3560 uint32 value, newval;
3561 int i, operand_count, o_operand_count;
3562 xtensa_opcode o_opcode;
3564 /* Address does not matter in this case. We might need to
3565 fix it to handle branches/jumps. */
3566 bfd_vma self_address = 0;
3568 o_opcode = xtensa_opcode_lookup (isa, narrowable[opi].narrow);
3569 if (o_opcode == XTENSA_UNDEFINED)
3571 o_fmt = get_single_format (o_opcode);
3572 if (o_fmt == XTENSA_UNDEFINED)
3575 if (xtensa_format_length (isa, fmt) != 3
3576 || xtensa_format_length (isa, o_fmt) != 2)
3579 xtensa_format_encode (isa, o_fmt, o_insnbuf);
3580 operand_count = xtensa_opcode_num_operands (isa, opcode);
3581 o_operand_count = xtensa_opcode_num_operands (isa, o_opcode);
3583 if (xtensa_opcode_encode (isa, o_fmt, 0, o_slotbuf, o_opcode) != 0)
3588 if (xtensa_opcode_num_operands (isa, o_opcode) != operand_count)
3593 uint32 rawval0, rawval1, rawval2;
3595 if (o_operand_count + 1 != operand_count
3596 || xtensa_operand_get_field (isa, opcode, 0,
3597 fmt, 0, slotbuf, &rawval0) != 0
3598 || xtensa_operand_get_field (isa, opcode, 1,
3599 fmt, 0, slotbuf, &rawval1) != 0
3600 || xtensa_operand_get_field (isa, opcode, 2,
3601 fmt, 0, slotbuf, &rawval2) != 0
3602 || rawval1 != rawval2
3603 || rawval0 == rawval1 /* it is a nop */)
3607 for (i = 0; i < o_operand_count; ++i)
3609 if (xtensa_operand_get_field (isa, opcode, i, fmt, 0,
3611 || xtensa_operand_decode (isa, opcode, i, &value))
3614 /* PC-relative branches need adjustment, but
3615 the PC-rel operand will always have a relocation. */
3617 if (xtensa_operand_do_reloc (isa, o_opcode, i, &newval,
3619 || xtensa_operand_encode (isa, o_opcode, i, &newval)
3620 || xtensa_operand_set_field (isa, o_opcode, i, o_fmt, 0,
3625 if (xtensa_format_set_slot (isa, o_fmt, 0, o_insnbuf, o_slotbuf))
3635 /* Attempt to narrow an instruction. If the narrowing is valid, perform
3636 the action in-place directly into the contents and return TRUE. Otherwise,
3637 the return value is FALSE and the contents are not modified. */
3640 narrow_instruction (bfd_byte *contents,
3641 bfd_size_type content_length,
3642 bfd_size_type offset)
3644 xtensa_opcode opcode;
3645 bfd_size_type insn_len;
3646 xtensa_isa isa = xtensa_default_isa;
3648 xtensa_insnbuf o_insnbuf;
3650 static xtensa_insnbuf insnbuf = NULL;
3651 static xtensa_insnbuf slotbuf = NULL;
3653 if (insnbuf == NULL)
3655 insnbuf = xtensa_insnbuf_alloc (isa);
3656 slotbuf = xtensa_insnbuf_alloc (isa);
3659 BFD_ASSERT (offset < content_length);
3661 if (content_length < 2)
3664 /* We will hand-code a few of these for a little while.
3665 These have all been specified in the assembler aleady. */
3666 xtensa_insnbuf_from_chars (isa, insnbuf, &contents[offset],
3667 content_length - offset);
3668 fmt = xtensa_format_decode (isa, insnbuf);
3669 if (xtensa_format_num_slots (isa, fmt) != 1)
3672 if (xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf) != 0)
3675 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
3676 if (opcode == XTENSA_UNDEFINED)
3678 insn_len = xtensa_format_length (isa, fmt);
3679 if (insn_len > content_length)
3682 o_insnbuf = can_narrow_instruction (slotbuf, fmt, opcode);
3685 xtensa_insnbuf_to_chars (isa, o_insnbuf, contents + offset,
3686 content_length - offset);
3694 /* Check if an instruction can be "widened", i.e., changed from a 2-byte
3695 "density" instruction to a standard 3-byte instruction. If it is valid,
3696 return the instruction buffer holding the wide instruction. Otherwise,
3697 return 0. The set of valid widenings are specified by a string table
3698 but require some special case operand checks in some cases. */
3700 static xtensa_insnbuf
3701 can_widen_instruction (xtensa_insnbuf slotbuf,
3703 xtensa_opcode opcode)
3705 xtensa_isa isa = xtensa_default_isa;
3706 xtensa_format o_fmt;
3709 static xtensa_insnbuf o_insnbuf = NULL;
3710 static xtensa_insnbuf o_slotbuf = NULL;
3712 if (o_insnbuf == NULL)
3714 o_insnbuf = xtensa_insnbuf_alloc (isa);
3715 o_slotbuf = xtensa_insnbuf_alloc (isa);
3718 for (opi = 0; opi < (sizeof (widenable)/sizeof (struct string_pair)); opi++)
3720 bfd_boolean is_or = (strcmp ("or", widenable[opi].wide) == 0);
3721 bfd_boolean is_branch = (strcmp ("beqz", widenable[opi].wide) == 0
3722 || strcmp ("bnez", widenable[opi].wide) == 0);
3724 if (opcode == xtensa_opcode_lookup (isa, widenable[opi].narrow))
3726 uint32 value, newval;
3727 int i, operand_count, o_operand_count, check_operand_count;
3728 xtensa_opcode o_opcode;
3730 /* Address does not matter in this case. We might need to fix it
3731 to handle branches/jumps. */
3732 bfd_vma self_address = 0;
3734 o_opcode = xtensa_opcode_lookup (isa, widenable[opi].wide);
3735 if (o_opcode == XTENSA_UNDEFINED)
3737 o_fmt = get_single_format (o_opcode);
3738 if (o_fmt == XTENSA_UNDEFINED)
3741 if (xtensa_format_length (isa, fmt) != 2
3742 || xtensa_format_length (isa, o_fmt) != 3)
3745 xtensa_format_encode (isa, o_fmt, o_insnbuf);
3746 operand_count = xtensa_opcode_num_operands (isa, opcode);
3747 o_operand_count = xtensa_opcode_num_operands (isa, o_opcode);
3748 check_operand_count = o_operand_count;
3750 if (xtensa_opcode_encode (isa, o_fmt, 0, o_slotbuf, o_opcode) != 0)
3755 if (xtensa_opcode_num_operands (isa, o_opcode) != operand_count)
3760 uint32 rawval0, rawval1;
3762 if (o_operand_count != operand_count + 1
3763 || xtensa_operand_get_field (isa, opcode, 0,
3764 fmt, 0, slotbuf, &rawval0) != 0
3765 || xtensa_operand_get_field (isa, opcode, 1,
3766 fmt, 0, slotbuf, &rawval1) != 0
3767 || rawval0 == rawval1 /* it is a nop */)
3771 check_operand_count--;
3773 for (i = 0; i < check_operand_count; i++)
3776 if (is_or && i == o_operand_count - 1)
3778 if (xtensa_operand_get_field (isa, opcode, new_i, fmt, 0,
3780 || xtensa_operand_decode (isa, opcode, new_i, &value))
3783 /* PC-relative branches need adjustment, but
3784 the PC-rel operand will always have a relocation. */
3786 if (xtensa_operand_do_reloc (isa, o_opcode, i, &newval,
3788 || xtensa_operand_encode (isa, o_opcode, i, &newval)
3789 || xtensa_operand_set_field (isa, o_opcode, i, o_fmt, 0,
3794 if (xtensa_format_set_slot (isa, o_fmt, 0, o_insnbuf, o_slotbuf))
3804 /* Attempt to widen an instruction. If the widening is valid, perform
3805 the action in-place directly into the contents and return TRUE. Otherwise,
3806 the return value is FALSE and the contents are not modified. */
3809 widen_instruction (bfd_byte *contents,
3810 bfd_size_type content_length,
3811 bfd_size_type offset)
3813 xtensa_opcode opcode;
3814 bfd_size_type insn_len;
3815 xtensa_isa isa = xtensa_default_isa;
3817 xtensa_insnbuf o_insnbuf;
3819 static xtensa_insnbuf insnbuf = NULL;
3820 static xtensa_insnbuf slotbuf = NULL;
3822 if (insnbuf == NULL)
3824 insnbuf = xtensa_insnbuf_alloc (isa);
3825 slotbuf = xtensa_insnbuf_alloc (isa);
3828 BFD_ASSERT (offset < content_length);
3830 if (content_length < 2)
3833 /* We will hand-code a few of these for a little while.
3834 These have all been specified in the assembler aleady. */
3835 xtensa_insnbuf_from_chars (isa, insnbuf, &contents[offset],
3836 content_length - offset);
3837 fmt = xtensa_format_decode (isa, insnbuf);
3838 if (xtensa_format_num_slots (isa, fmt) != 1)
3841 if (xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf) != 0)
3844 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
3845 if (opcode == XTENSA_UNDEFINED)
3847 insn_len = xtensa_format_length (isa, fmt);
3848 if (insn_len > content_length)
3851 o_insnbuf = can_widen_instruction (slotbuf, fmt, opcode);
3854 xtensa_insnbuf_to_chars (isa, o_insnbuf, contents + offset,
3855 content_length - offset);
3862 /* Code for transforming CALLs at link-time. */
3864 static bfd_reloc_status_type
3865 elf_xtensa_do_asm_simplify (bfd_byte *contents,
3867 bfd_vma content_length,
3868 char **error_message)
3870 static xtensa_insnbuf insnbuf = NULL;
3871 static xtensa_insnbuf slotbuf = NULL;
3872 xtensa_format core_format = XTENSA_UNDEFINED;
3873 xtensa_opcode opcode;
3874 xtensa_opcode direct_call_opcode;
3875 xtensa_isa isa = xtensa_default_isa;
3876 bfd_byte *chbuf = contents + address;
3879 if (insnbuf == NULL)
3881 insnbuf = xtensa_insnbuf_alloc (isa);
3882 slotbuf = xtensa_insnbuf_alloc (isa);
3885 if (content_length < address)
3887 *error_message = _("Attempt to convert L32R/CALLX to CALL failed");
3888 return bfd_reloc_other;
3891 opcode = get_expanded_call_opcode (chbuf, content_length - address, 0);
3892 direct_call_opcode = swap_callx_for_call_opcode (opcode);
3893 if (direct_call_opcode == XTENSA_UNDEFINED)
3895 *error_message = _("Attempt to convert L32R/CALLX to CALL failed");
3896 return bfd_reloc_other;
3899 /* Assemble a NOP ("or a1, a1, a1") into the 0 byte offset. */
3900 core_format = xtensa_format_lookup (isa, "x24");
3901 opcode = xtensa_opcode_lookup (isa, "or");
3902 xtensa_opcode_encode (isa, core_format, 0, slotbuf, opcode);
3903 for (opn = 0; opn < 3; opn++)
3906 xtensa_operand_encode (isa, opcode, opn, ®no);
3907 xtensa_operand_set_field (isa, opcode, opn, core_format, 0,
3910 xtensa_format_encode (isa, core_format, insnbuf);
3911 xtensa_format_set_slot (isa, core_format, 0, insnbuf, slotbuf);
3912 xtensa_insnbuf_to_chars (isa, insnbuf, chbuf, content_length - address);
3914 /* Assemble a CALL ("callN 0") into the 3 byte offset. */
3915 xtensa_opcode_encode (isa, core_format, 0, slotbuf, direct_call_opcode);
3916 xtensa_operand_set_field (isa, opcode, 0, core_format, 0, slotbuf, 0);
3918 xtensa_format_encode (isa, core_format, insnbuf);
3919 xtensa_format_set_slot (isa, core_format, 0, insnbuf, slotbuf);
3920 xtensa_insnbuf_to_chars (isa, insnbuf, chbuf + 3,
3921 content_length - address - 3);
3923 return bfd_reloc_ok;
3927 static bfd_reloc_status_type
3928 contract_asm_expansion (bfd_byte *contents,
3929 bfd_vma content_length,
3930 Elf_Internal_Rela *irel,
3931 char **error_message)
3933 bfd_reloc_status_type retval =
3934 elf_xtensa_do_asm_simplify (contents, irel->r_offset, content_length,
3937 if (retval != bfd_reloc_ok)
3938 return bfd_reloc_dangerous;
3940 /* Update the irel->r_offset field so that the right immediate and
3941 the right instruction are modified during the relocation. */
3942 irel->r_offset += 3;
3943 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), R_XTENSA_SLOT0_OP);
3944 return bfd_reloc_ok;
3948 static xtensa_opcode
3949 swap_callx_for_call_opcode (xtensa_opcode opcode)
3951 init_call_opcodes ();
3953 if (opcode == callx0_op) return call0_op;
3954 if (opcode == callx4_op) return call4_op;
3955 if (opcode == callx8_op) return call8_op;
3956 if (opcode == callx12_op) return call12_op;
3958 /* Return XTENSA_UNDEFINED if the opcode is not an indirect call. */
3959 return XTENSA_UNDEFINED;
3963 /* Check if "buf" is pointing to a "L32R aN; CALLX aN" or "CONST16 aN;
3964 CONST16 aN; CALLX aN" sequence, and if so, return the CALLX opcode.
3965 If not, return XTENSA_UNDEFINED. */
3967 #define L32R_TARGET_REG_OPERAND 0
3968 #define CONST16_TARGET_REG_OPERAND 0
3969 #define CALLN_SOURCE_OPERAND 0
3971 static xtensa_opcode
3972 get_expanded_call_opcode (bfd_byte *buf, int bufsize, bfd_boolean *p_uses_l32r)
3974 static xtensa_insnbuf insnbuf = NULL;
3975 static xtensa_insnbuf slotbuf = NULL;
3977 xtensa_opcode opcode;
3978 xtensa_isa isa = xtensa_default_isa;
3979 uint32 regno, const16_regno, call_regno;
3982 if (insnbuf == NULL)
3984 insnbuf = xtensa_insnbuf_alloc (isa);
3985 slotbuf = xtensa_insnbuf_alloc (isa);
3988 xtensa_insnbuf_from_chars (isa, insnbuf, buf, bufsize);
3989 fmt = xtensa_format_decode (isa, insnbuf);
3990 if (fmt == XTENSA_UNDEFINED
3991 || xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf))
3992 return XTENSA_UNDEFINED;
3994 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
3995 if (opcode == XTENSA_UNDEFINED)
3996 return XTENSA_UNDEFINED;
3998 if (opcode == get_l32r_opcode ())
4001 *p_uses_l32r = TRUE;
4002 if (xtensa_operand_get_field (isa, opcode, L32R_TARGET_REG_OPERAND,
4003 fmt, 0, slotbuf, ®no)
4004 || xtensa_operand_decode (isa, opcode, L32R_TARGET_REG_OPERAND,
4006 return XTENSA_UNDEFINED;
4008 else if (opcode == get_const16_opcode ())
4011 *p_uses_l32r = FALSE;
4012 if (xtensa_operand_get_field (isa, opcode, CONST16_TARGET_REG_OPERAND,
4013 fmt, 0, slotbuf, ®no)
4014 || xtensa_operand_decode (isa, opcode, CONST16_TARGET_REG_OPERAND,
4016 return XTENSA_UNDEFINED;
4018 /* Check that the next instruction is also CONST16. */
4019 offset += xtensa_format_length (isa, fmt);
4020 xtensa_insnbuf_from_chars (isa, insnbuf, buf + offset, bufsize - offset);
4021 fmt = xtensa_format_decode (isa, insnbuf);
4022 if (fmt == XTENSA_UNDEFINED
4023 || xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf))
4024 return XTENSA_UNDEFINED;
4025 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
4026 if (opcode != get_const16_opcode ())
4027 return XTENSA_UNDEFINED;
4029 if (xtensa_operand_get_field (isa, opcode, CONST16_TARGET_REG_OPERAND,
4030 fmt, 0, slotbuf, &const16_regno)
4031 || xtensa_operand_decode (isa, opcode, CONST16_TARGET_REG_OPERAND,
4033 || const16_regno != regno)
4034 return XTENSA_UNDEFINED;
4037 return XTENSA_UNDEFINED;
4039 /* Next instruction should be an CALLXn with operand 0 == regno. */
4040 offset += xtensa_format_length (isa, fmt);
4041 xtensa_insnbuf_from_chars (isa, insnbuf, buf + offset, bufsize - offset);
4042 fmt = xtensa_format_decode (isa, insnbuf);
4043 if (fmt == XTENSA_UNDEFINED
4044 || xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf))
4045 return XTENSA_UNDEFINED;
4046 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
4047 if (opcode == XTENSA_UNDEFINED
4048 || !is_indirect_call_opcode (opcode))
4049 return XTENSA_UNDEFINED;
4051 if (xtensa_operand_get_field (isa, opcode, CALLN_SOURCE_OPERAND,
4052 fmt, 0, slotbuf, &call_regno)
4053 || xtensa_operand_decode (isa, opcode, CALLN_SOURCE_OPERAND,
4055 return XTENSA_UNDEFINED;
4057 if (call_regno != regno)
4058 return XTENSA_UNDEFINED;
4064 /* Data structures used during relaxation. */
4066 /* r_reloc: relocation values. */
4068 /* Through the relaxation process, we need to keep track of the values
4069 that will result from evaluating relocations. The standard ELF
4070 relocation structure is not sufficient for this purpose because we're
4071 operating on multiple input files at once, so we need to know which
4072 input file a relocation refers to. The r_reloc structure thus
4073 records both the input file (bfd) and ELF relocation.
4075 For efficiency, an r_reloc also contains a "target_offset" field to
4076 cache the target-section-relative offset value that is represented by
4079 The r_reloc also contains a virtual offset that allows multiple
4080 inserted literals to be placed at the same "address" with
4081 different offsets. */
4083 typedef struct r_reloc_struct r_reloc;
4085 struct r_reloc_struct
4088 Elf_Internal_Rela rela;
4089 bfd_vma target_offset;
4090 bfd_vma virtual_offset;
4094 /* The r_reloc structure is included by value in literal_value, but not
4095 every literal_value has an associated relocation -- some are simple
4096 constants. In such cases, we set all the fields in the r_reloc
4097 struct to zero. The r_reloc_is_const function should be used to
4098 detect this case. */
4101 r_reloc_is_const (const r_reloc *r_rel)
4103 return (r_rel->abfd == NULL);
4108 r_reloc_get_target_offset (const r_reloc *r_rel)
4110 bfd_vma target_offset;
4111 unsigned long r_symndx;
4113 BFD_ASSERT (!r_reloc_is_const (r_rel));
4114 r_symndx = ELF32_R_SYM (r_rel->rela.r_info);
4115 target_offset = get_elf_r_symndx_offset (r_rel->abfd, r_symndx);
4116 return (target_offset + r_rel->rela.r_addend);
4120 static struct elf_link_hash_entry *
4121 r_reloc_get_hash_entry (const r_reloc *r_rel)
4123 unsigned long r_symndx = ELF32_R_SYM (r_rel->rela.r_info);
4124 return get_elf_r_symndx_hash_entry (r_rel->abfd, r_symndx);
4129 r_reloc_get_section (const r_reloc *r_rel)
4131 unsigned long r_symndx = ELF32_R_SYM (r_rel->rela.r_info);
4132 return get_elf_r_symndx_section (r_rel->abfd, r_symndx);
4137 r_reloc_is_defined (const r_reloc *r_rel)
4143 sec = r_reloc_get_section (r_rel);
4144 if (sec == bfd_abs_section_ptr
4145 || sec == bfd_com_section_ptr
4146 || sec == bfd_und_section_ptr)
4153 r_reloc_init (r_reloc *r_rel,
4155 Elf_Internal_Rela *irel,
4157 bfd_size_type content_length)
4160 reloc_howto_type *howto;
4164 r_rel->rela = *irel;
4166 r_rel->target_offset = r_reloc_get_target_offset (r_rel);
4167 r_rel->virtual_offset = 0;
4168 r_type = ELF32_R_TYPE (r_rel->rela.r_info);
4169 howto = &elf_howto_table[r_type];
4170 if (howto->partial_inplace)
4172 bfd_vma inplace_val;
4173 BFD_ASSERT (r_rel->rela.r_offset < content_length);
4175 inplace_val = bfd_get_32 (abfd, &contents[r_rel->rela.r_offset]);
4176 r_rel->target_offset += inplace_val;
4180 memset (r_rel, 0, sizeof (r_reloc));
4187 print_r_reloc (FILE *fp, const r_reloc *r_rel)
4189 if (r_reloc_is_defined (r_rel))
4191 asection *sec = r_reloc_get_section (r_rel);
4192 fprintf (fp, " %s(%s + ", sec->owner->filename, sec->name);
4194 else if (r_reloc_get_hash_entry (r_rel))
4195 fprintf (fp, " %s + ", r_reloc_get_hash_entry (r_rel)->root.root.string);
4197 fprintf (fp, " ?? + ");
4199 fprintf_vma (fp, r_rel->target_offset);
4200 if (r_rel->virtual_offset)
4202 fprintf (fp, " + ");
4203 fprintf_vma (fp, r_rel->virtual_offset);
4212 /* source_reloc: relocations that reference literals. */
4214 /* To determine whether literals can be coalesced, we need to first
4215 record all the relocations that reference the literals. The
4216 source_reloc structure below is used for this purpose. The
4217 source_reloc entries are kept in a per-literal-section array, sorted
4218 by offset within the literal section (i.e., target offset).
4220 The source_sec and r_rel.rela.r_offset fields identify the source of
4221 the relocation. The r_rel field records the relocation value, i.e.,
4222 the offset of the literal being referenced. The opnd field is needed
4223 to determine the range of the immediate field to which the relocation
4224 applies, so we can determine whether another literal with the same
4225 value is within range. The is_null field is true when the relocation
4226 is being removed (e.g., when an L32R is being removed due to a CALLX
4227 that is converted to a direct CALL). */
4229 typedef struct source_reloc_struct source_reloc;
4231 struct source_reloc_struct
4233 asection *source_sec;
4235 xtensa_opcode opcode;
4237 bfd_boolean is_null;
4238 bfd_boolean is_abs_literal;
4243 init_source_reloc (source_reloc *reloc,
4244 asection *source_sec,
4245 const r_reloc *r_rel,
4246 xtensa_opcode opcode,
4248 bfd_boolean is_abs_literal)
4250 reloc->source_sec = source_sec;
4251 reloc->r_rel = *r_rel;
4252 reloc->opcode = opcode;
4254 reloc->is_null = FALSE;
4255 reloc->is_abs_literal = is_abs_literal;
4259 /* Find the source_reloc for a particular source offset and relocation
4260 type. Note that the array is sorted by _target_ offset, so this is
4261 just a linear search. */
4263 static source_reloc *
4264 find_source_reloc (source_reloc *src_relocs,
4267 Elf_Internal_Rela *irel)
4271 for (i = 0; i < src_count; i++)
4273 if (src_relocs[i].source_sec == sec
4274 && src_relocs[i].r_rel.rela.r_offset == irel->r_offset
4275 && (ELF32_R_TYPE (src_relocs[i].r_rel.rela.r_info)
4276 == ELF32_R_TYPE (irel->r_info)))
4277 return &src_relocs[i];
4285 source_reloc_compare (const void *ap, const void *bp)
4287 const source_reloc *a = (const source_reloc *) ap;
4288 const source_reloc *b = (const source_reloc *) bp;
4290 if (a->r_rel.target_offset != b->r_rel.target_offset)
4291 return (a->r_rel.target_offset - b->r_rel.target_offset);
4293 /* We don't need to sort on these criteria for correctness,
4294 but enforcing a more strict ordering prevents unstable qsort
4295 from behaving differently with different implementations.
4296 Without the code below we get correct but different results
4297 on Solaris 2.7 and 2.8. We would like to always produce the
4298 same results no matter the host. */
4300 if ((!a->is_null) - (!b->is_null))
4301 return ((!a->is_null) - (!b->is_null));
4302 return internal_reloc_compare (&a->r_rel.rela, &b->r_rel.rela);
4306 /* Literal values and value hash tables. */
4308 /* Literals with the same value can be coalesced. The literal_value
4309 structure records the value of a literal: the "r_rel" field holds the
4310 information from the relocation on the literal (if there is one) and
4311 the "value" field holds the contents of the literal word itself.
4313 The value_map structure records a literal value along with the
4314 location of a literal holding that value. The value_map hash table
4315 is indexed by the literal value, so that we can quickly check if a
4316 particular literal value has been seen before and is thus a candidate
4319 typedef struct literal_value_struct literal_value;
4320 typedef struct value_map_struct value_map;
4321 typedef struct value_map_hash_table_struct value_map_hash_table;
4323 struct literal_value_struct
4326 unsigned long value;
4327 bfd_boolean is_abs_literal;
4330 struct value_map_struct
4332 literal_value val; /* The literal value. */
4333 r_reloc loc; /* Location of the literal. */
4337 struct value_map_hash_table_struct
4339 unsigned bucket_count;
4340 value_map **buckets;
4342 bfd_boolean has_last_loc;
4348 init_literal_value (literal_value *lit,
4349 const r_reloc *r_rel,
4350 unsigned long value,
4351 bfd_boolean is_abs_literal)
4353 lit->r_rel = *r_rel;
4355 lit->is_abs_literal = is_abs_literal;
4360 literal_value_equal (const literal_value *src1,
4361 const literal_value *src2,
4362 bfd_boolean final_static_link)
4364 struct elf_link_hash_entry *h1, *h2;
4366 if (r_reloc_is_const (&src1->r_rel) != r_reloc_is_const (&src2->r_rel))
4369 if (r_reloc_is_const (&src1->r_rel))
4370 return (src1->value == src2->value);
4372 if (ELF32_R_TYPE (src1->r_rel.rela.r_info)
4373 != ELF32_R_TYPE (src2->r_rel.rela.r_info))
4376 if (src1->r_rel.target_offset != src2->r_rel.target_offset)
4379 if (src1->r_rel.virtual_offset != src2->r_rel.virtual_offset)
4382 if (src1->value != src2->value)
4385 /* Now check for the same section (if defined) or the same elf_hash
4386 (if undefined or weak). */
4387 h1 = r_reloc_get_hash_entry (&src1->r_rel);
4388 h2 = r_reloc_get_hash_entry (&src2->r_rel);
4389 if (r_reloc_is_defined (&src1->r_rel)
4390 && (final_static_link
4391 || ((!h1 || h1->root.type != bfd_link_hash_defweak)
4392 && (!h2 || h2->root.type != bfd_link_hash_defweak))))
4394 if (r_reloc_get_section (&src1->r_rel)
4395 != r_reloc_get_section (&src2->r_rel))
4400 /* Require that the hash entries (i.e., symbols) be identical. */
4401 if (h1 != h2 || h1 == 0)
4405 if (src1->is_abs_literal != src2->is_abs_literal)
4412 /* Must be power of 2. */
4413 #define INITIAL_HASH_RELOC_BUCKET_COUNT 1024
4415 static value_map_hash_table *
4416 value_map_hash_table_init (void)
4418 value_map_hash_table *values;
4420 values = (value_map_hash_table *)
4421 bfd_zmalloc (sizeof (value_map_hash_table));
4422 values->bucket_count = INITIAL_HASH_RELOC_BUCKET_COUNT;
4424 values->buckets = (value_map **)
4425 bfd_zmalloc (sizeof (value_map *) * values->bucket_count);
4426 if (values->buckets == NULL)
4431 values->has_last_loc = FALSE;
4438 value_map_hash_table_delete (value_map_hash_table *table)
4440 free (table->buckets);
4446 hash_bfd_vma (bfd_vma val)
4448 return (val >> 2) + (val >> 10);
4453 literal_value_hash (const literal_value *src)
4457 hash_val = hash_bfd_vma (src->value);
4458 if (!r_reloc_is_const (&src->r_rel))
4462 hash_val += hash_bfd_vma (src->is_abs_literal * 1000);
4463 hash_val += hash_bfd_vma (src->r_rel.target_offset);
4464 hash_val += hash_bfd_vma (src->r_rel.virtual_offset);
4466 /* Now check for the same section and the same elf_hash. */
4467 if (r_reloc_is_defined (&src->r_rel))
4468 sec_or_hash = r_reloc_get_section (&src->r_rel);
4470 sec_or_hash = r_reloc_get_hash_entry (&src->r_rel);
4471 hash_val += hash_bfd_vma ((bfd_vma) (size_t) sec_or_hash);
4477 /* Check if the specified literal_value has been seen before. */
4480 value_map_get_cached_value (value_map_hash_table *map,
4481 const literal_value *val,
4482 bfd_boolean final_static_link)
4488 idx = literal_value_hash (val);
4489 idx = idx & (map->bucket_count - 1);
4490 bucket = map->buckets[idx];
4491 for (map_e = bucket; map_e; map_e = map_e->next)
4493 if (literal_value_equal (&map_e->val, val, final_static_link))
4500 /* Record a new literal value. It is illegal to call this if VALUE
4501 already has an entry here. */
4504 add_value_map (value_map_hash_table *map,
4505 const literal_value *val,
4507 bfd_boolean final_static_link)
4509 value_map **bucket_p;
4512 value_map *val_e = (value_map *) bfd_zmalloc (sizeof (value_map));
4515 bfd_set_error (bfd_error_no_memory);
4519 BFD_ASSERT (!value_map_get_cached_value (map, val, final_static_link));
4523 idx = literal_value_hash (val);
4524 idx = idx & (map->bucket_count - 1);
4525 bucket_p = &map->buckets[idx];
4527 val_e->next = *bucket_p;
4530 /* FIXME: Consider resizing the hash table if we get too many entries. */
4536 /* Lists of text actions (ta_) for narrowing, widening, longcall
4537 conversion, space fill, code & literal removal, etc. */
4539 /* The following text actions are generated:
4541 "ta_remove_insn" remove an instruction or instructions
4542 "ta_remove_longcall" convert longcall to call
4543 "ta_convert_longcall" convert longcall to nop/call
4544 "ta_narrow_insn" narrow a wide instruction
4545 "ta_widen" widen a narrow instruction
4546 "ta_fill" add fill or remove fill
4547 removed < 0 is a fill; branches to the fill address will be
4548 changed to address + fill size (e.g., address - removed)
4549 removed >= 0 branches to the fill address will stay unchanged
4550 "ta_remove_literal" remove a literal; this action is
4551 indicated when a literal is removed
4553 "ta_add_literal" insert a new literal; this action is
4554 indicated when a literal has been moved.
4555 It may use a virtual_offset because
4556 multiple literals can be placed at the
4559 For each of these text actions, we also record the number of bytes
4560 removed by performing the text action. In the case of a "ta_widen"
4561 or a "ta_fill" that adds space, the removed_bytes will be negative. */
4563 typedef struct text_action_struct text_action;
4564 typedef struct text_action_list_struct text_action_list;
4565 typedef enum text_action_enum_t text_action_t;
4567 enum text_action_enum_t
4570 ta_remove_insn, /* removed = -size */
4571 ta_remove_longcall, /* removed = -size */
4572 ta_convert_longcall, /* removed = 0 */
4573 ta_narrow_insn, /* removed = -1 */
4574 ta_widen_insn, /* removed = +1 */
4575 ta_fill, /* removed = +size */
4581 /* Structure for a text action record. */
4582 struct text_action_struct
4584 text_action_t action;
4585 asection *sec; /* Optional */
4587 bfd_vma virtual_offset; /* Zero except for adding literals. */
4589 literal_value value; /* Only valid when adding literals. */
4595 /* List of all of the actions taken on a text section. */
4596 struct text_action_list_struct
4602 static text_action *
4603 find_fill_action (text_action_list *l, asection *sec, bfd_vma offset)
4607 /* It is not necessary to fill at the end of a section. */
4608 if (sec->size == offset)
4611 for (m_p = &l->head; *m_p && (*m_p)->offset <= offset; m_p = &(*m_p)->next)
4613 text_action *t = *m_p;
4614 /* When the action is another fill at the same address,
4615 just increase the size. */
4616 if (t->offset == offset && t->action == ta_fill)
4624 compute_removed_action_diff (const text_action *ta,
4628 int removable_space)
4631 int current_removed = 0;
4634 current_removed = ta->removed_bytes;
4636 BFD_ASSERT (ta == NULL || ta->offset == offset);
4637 BFD_ASSERT (ta == NULL || ta->action == ta_fill);
4639 /* It is not necessary to fill at the end of a section. Clean this up. */
4640 if (sec->size == offset)
4641 new_removed = removable_space - 0;
4645 int added = -removed - current_removed;
4646 /* Ignore multiples of the section alignment. */
4647 added = ((1 << sec->alignment_power) - 1) & added;
4648 new_removed = (-added);
4650 /* Modify for removable. */
4651 space = removable_space - new_removed;
4652 new_removed = (removable_space
4653 - (((1 << sec->alignment_power) - 1) & space));
4655 return (new_removed - current_removed);
4660 adjust_fill_action (text_action *ta, int fill_diff)
4662 ta->removed_bytes += fill_diff;
4666 /* Add a modification action to the text. For the case of adding or
4667 removing space, modify any current fill and assume that
4668 "unreachable_space" bytes can be freely contracted. Note that a
4669 negative removed value is a fill. */
4672 text_action_add (text_action_list *l,
4673 text_action_t action,
4681 /* It is not necessary to fill at the end of a section. */
4682 if (action == ta_fill && sec->size == offset)
4685 /* It is not necessary to fill 0 bytes. */
4686 if (action == ta_fill && removed == 0)
4689 for (m_p = &l->head; *m_p && (*m_p)->offset <= offset; m_p = &(*m_p)->next)
4691 text_action *t = *m_p;
4692 /* When the action is another fill at the same address,
4693 just increase the size. */
4694 if (t->offset == offset && t->action == ta_fill && action == ta_fill)
4696 t->removed_bytes += removed;
4701 /* Create a new record and fill it up. */
4702 ta = (text_action *) bfd_zmalloc (sizeof (text_action));
4703 ta->action = action;
4705 ta->offset = offset;
4706 ta->removed_bytes = removed;
4713 text_action_add_literal (text_action_list *l,
4714 text_action_t action,
4716 const literal_value *value,
4721 asection *sec = r_reloc_get_section (loc);
4722 bfd_vma offset = loc->target_offset;
4723 bfd_vma virtual_offset = loc->virtual_offset;
4725 BFD_ASSERT (action == ta_add_literal);
4727 for (m_p = &l->head; *m_p != NULL; m_p = &(*m_p)->next)
4729 if ((*m_p)->offset > offset
4730 && ((*m_p)->offset != offset
4731 || (*m_p)->virtual_offset > virtual_offset))
4735 /* Create a new record and fill it up. */
4736 ta = (text_action *) bfd_zmalloc (sizeof (text_action));
4737 ta->action = action;
4739 ta->offset = offset;
4740 ta->virtual_offset = virtual_offset;
4742 ta->removed_bytes = removed;
4748 /* Find the total offset adjustment for the relaxations specified by
4749 text_actions, beginning from a particular starting action. This is
4750 typically used from offset_with_removed_text to search an entire list of
4751 actions, but it may also be called directly when adjusting adjacent offsets
4752 so that each search may begin where the previous one left off. */
4755 removed_by_actions (text_action **p_start_action,
4757 bfd_boolean before_fill)
4762 r = *p_start_action;
4765 if (r->offset > offset)
4768 if (r->offset == offset
4769 && (before_fill || r->action != ta_fill || r->removed_bytes >= 0))
4772 removed += r->removed_bytes;
4777 *p_start_action = r;
4783 offset_with_removed_text (text_action_list *action_list, bfd_vma offset)
4785 text_action *r = action_list->head;
4786 return offset - removed_by_actions (&r, offset, FALSE);
4791 action_list_count (text_action_list *action_list)
4793 text_action *r = action_list->head;
4795 for (r = action_list->head; r != NULL; r = r->next)
4803 /* The find_insn_action routine will only find non-fill actions. */
4805 static text_action *
4806 find_insn_action (text_action_list *action_list, bfd_vma offset)
4809 for (t = action_list->head; t; t = t->next)
4811 if (t->offset == offset)
4818 case ta_remove_insn:
4819 case ta_remove_longcall:
4820 case ta_convert_longcall:
4821 case ta_narrow_insn:
4824 case ta_remove_literal:
4825 case ta_add_literal:
4838 print_action_list (FILE *fp, text_action_list *action_list)
4842 fprintf (fp, "Text Action\n");
4843 for (r = action_list->head; r != NULL; r = r->next)
4845 const char *t = "unknown";
4848 case ta_remove_insn:
4849 t = "remove_insn"; break;
4850 case ta_remove_longcall:
4851 t = "remove_longcall"; break;
4852 case ta_convert_longcall:
4853 t = "convert_longcall"; break;
4854 case ta_narrow_insn:
4855 t = "narrow_insn"; break;
4857 t = "widen_insn"; break;
4862 case ta_remove_literal:
4863 t = "remove_literal"; break;
4864 case ta_add_literal:
4865 t = "add_literal"; break;
4868 fprintf (fp, "%s: %s[0x%lx] \"%s\" %d\n",
4869 r->sec->owner->filename,
4870 r->sec->name, r->offset, t, r->removed_bytes);
4877 /* Lists of literals being coalesced or removed. */
4879 /* In the usual case, the literal identified by "from" is being
4880 coalesced with another literal identified by "to". If the literal is
4881 unused and is being removed altogether, "to.abfd" will be NULL.
4882 The removed_literal entries are kept on a per-section list, sorted
4883 by the "from" offset field. */
4885 typedef struct removed_literal_struct removed_literal;
4886 typedef struct removed_literal_list_struct removed_literal_list;
4888 struct removed_literal_struct
4892 removed_literal *next;
4895 struct removed_literal_list_struct
4897 removed_literal *head;
4898 removed_literal *tail;
4902 /* Record that the literal at "from" is being removed. If "to" is not
4903 NULL, the "from" literal is being coalesced with the "to" literal. */
4906 add_removed_literal (removed_literal_list *removed_list,
4907 const r_reloc *from,
4910 removed_literal *r, *new_r, *next_r;
4912 new_r = (removed_literal *) bfd_zmalloc (sizeof (removed_literal));
4914 new_r->from = *from;
4918 new_r->to.abfd = NULL;
4921 r = removed_list->head;
4924 removed_list->head = new_r;
4925 removed_list->tail = new_r;
4927 /* Special check for common case of append. */
4928 else if (removed_list->tail->from.target_offset < from->target_offset)
4930 removed_list->tail->next = new_r;
4931 removed_list->tail = new_r;
4935 while (r->from.target_offset < from->target_offset && r->next)
4941 new_r->next = next_r;
4943 removed_list->tail = new_r;
4948 /* Check if the list of removed literals contains an entry for the
4949 given address. Return the entry if found. */
4951 static removed_literal *
4952 find_removed_literal (removed_literal_list *removed_list, bfd_vma addr)
4954 removed_literal *r = removed_list->head;
4955 while (r && r->from.target_offset < addr)
4957 if (r && r->from.target_offset == addr)
4966 print_removed_literals (FILE *fp, removed_literal_list *removed_list)
4969 r = removed_list->head;
4971 fprintf (fp, "Removed Literals\n");
4972 for (; r != NULL; r = r->next)
4974 print_r_reloc (fp, &r->from);
4975 fprintf (fp, " => ");
4976 if (r->to.abfd == NULL)
4977 fprintf (fp, "REMOVED");
4979 print_r_reloc (fp, &r->to);
4987 /* Per-section data for relaxation. */
4989 typedef struct reloc_bfd_fix_struct reloc_bfd_fix;
4991 struct xtensa_relax_info_struct
4993 bfd_boolean is_relaxable_literal_section;
4994 bfd_boolean is_relaxable_asm_section;
4995 int visited; /* Number of times visited. */
4997 source_reloc *src_relocs; /* Array[src_count]. */
4999 int src_next; /* Next src_relocs entry to assign. */
5001 removed_literal_list removed_list;
5002 text_action_list action_list;
5004 reloc_bfd_fix *fix_list;
5005 reloc_bfd_fix *fix_array;
5006 unsigned fix_array_count;
5008 /* Support for expanding the reloc array that is stored
5009 in the section structure. If the relocations have been
5010 reallocated, the newly allocated relocations will be referenced
5011 here along with the actual size allocated. The relocation
5012 count will always be found in the section structure. */
5013 Elf_Internal_Rela *allocated_relocs;
5014 unsigned relocs_count;
5015 unsigned allocated_relocs_count;
5018 struct elf_xtensa_section_data
5020 struct bfd_elf_section_data elf;
5021 xtensa_relax_info relax_info;
5026 elf_xtensa_new_section_hook (bfd *abfd, asection *sec)
5028 if (!sec->used_by_bfd)
5030 struct elf_xtensa_section_data *sdata;
5031 bfd_size_type amt = sizeof (*sdata);
5033 sdata = bfd_zalloc (abfd, amt);
5036 sec->used_by_bfd = sdata;
5039 return _bfd_elf_new_section_hook (abfd, sec);
5043 static xtensa_relax_info *
5044 get_xtensa_relax_info (asection *sec)
5046 struct elf_xtensa_section_data *section_data;
5048 /* No info available if no section or if it is an output section. */
5049 if (!sec || sec == sec->output_section)
5052 section_data = (struct elf_xtensa_section_data *) elf_section_data (sec);
5053 return §ion_data->relax_info;
5058 init_xtensa_relax_info (asection *sec)
5060 xtensa_relax_info *relax_info = get_xtensa_relax_info (sec);
5062 relax_info->is_relaxable_literal_section = FALSE;
5063 relax_info->is_relaxable_asm_section = FALSE;
5064 relax_info->visited = 0;
5066 relax_info->src_relocs = NULL;
5067 relax_info->src_count = 0;
5068 relax_info->src_next = 0;
5070 relax_info->removed_list.head = NULL;
5071 relax_info->removed_list.tail = NULL;
5073 relax_info->action_list.head = NULL;
5075 relax_info->fix_list = NULL;
5076 relax_info->fix_array = NULL;
5077 relax_info->fix_array_count = 0;
5079 relax_info->allocated_relocs = NULL;
5080 relax_info->relocs_count = 0;
5081 relax_info->allocated_relocs_count = 0;
5085 /* Coalescing literals may require a relocation to refer to a section in
5086 a different input file, but the standard relocation information
5087 cannot express that. Instead, the reloc_bfd_fix structures are used
5088 to "fix" the relocations that refer to sections in other input files.
5089 These structures are kept on per-section lists. The "src_type" field
5090 records the relocation type in case there are multiple relocations on
5091 the same location. FIXME: This is ugly; an alternative might be to
5092 add new symbols with the "owner" field to some other input file. */
5094 struct reloc_bfd_fix_struct
5098 unsigned src_type; /* Relocation type. */
5100 asection *target_sec;
5101 bfd_vma target_offset;
5102 bfd_boolean translated;
5104 reloc_bfd_fix *next;
5108 static reloc_bfd_fix *
5109 reloc_bfd_fix_init (asection *src_sec,
5112 asection *target_sec,
5113 bfd_vma target_offset,
5114 bfd_boolean translated)
5118 fix = (reloc_bfd_fix *) bfd_malloc (sizeof (reloc_bfd_fix));
5119 fix->src_sec = src_sec;
5120 fix->src_offset = src_offset;
5121 fix->src_type = src_type;
5122 fix->target_sec = target_sec;
5123 fix->target_offset = target_offset;
5124 fix->translated = translated;
5131 add_fix (asection *src_sec, reloc_bfd_fix *fix)
5133 xtensa_relax_info *relax_info;
5135 relax_info = get_xtensa_relax_info (src_sec);
5136 fix->next = relax_info->fix_list;
5137 relax_info->fix_list = fix;
5142 fix_compare (const void *ap, const void *bp)
5144 const reloc_bfd_fix *a = (const reloc_bfd_fix *) ap;
5145 const reloc_bfd_fix *b = (const reloc_bfd_fix *) bp;
5147 if (a->src_offset != b->src_offset)
5148 return (a->src_offset - b->src_offset);
5149 return (a->src_type - b->src_type);
5154 cache_fix_array (asection *sec)
5156 unsigned i, count = 0;
5158 xtensa_relax_info *relax_info = get_xtensa_relax_info (sec);
5160 if (relax_info == NULL)
5162 if (relax_info->fix_list == NULL)
5165 for (r = relax_info->fix_list; r != NULL; r = r->next)
5168 relax_info->fix_array =
5169 (reloc_bfd_fix *) bfd_malloc (sizeof (reloc_bfd_fix) * count);
5170 relax_info->fix_array_count = count;
5172 r = relax_info->fix_list;
5173 for (i = 0; i < count; i++, r = r->next)
5175 relax_info->fix_array[count - 1 - i] = *r;
5176 relax_info->fix_array[count - 1 - i].next = NULL;
5179 qsort (relax_info->fix_array, relax_info->fix_array_count,
5180 sizeof (reloc_bfd_fix), fix_compare);
5184 static reloc_bfd_fix *
5185 get_bfd_fix (asection *sec, bfd_vma offset, unsigned type)
5187 xtensa_relax_info *relax_info = get_xtensa_relax_info (sec);
5191 if (relax_info == NULL)
5193 if (relax_info->fix_list == NULL)
5196 if (relax_info->fix_array == NULL)
5197 cache_fix_array (sec);
5199 key.src_offset = offset;
5200 key.src_type = type;
5201 rv = bsearch (&key, relax_info->fix_array, relax_info->fix_array_count,
5202 sizeof (reloc_bfd_fix), fix_compare);
5207 /* Section caching. */
5209 typedef struct section_cache_struct section_cache_t;
5211 struct section_cache_struct
5215 bfd_byte *contents; /* Cache of the section contents. */
5216 bfd_size_type content_length;
5218 property_table_entry *ptbl; /* Cache of the section property table. */
5221 Elf_Internal_Rela *relocs; /* Cache of the section relocations. */
5222 unsigned reloc_count;
5227 init_section_cache (section_cache_t *sec_cache)
5229 memset (sec_cache, 0, sizeof (*sec_cache));
5234 clear_section_cache (section_cache_t *sec_cache)
5238 release_contents (sec_cache->sec, sec_cache->contents);
5239 release_internal_relocs (sec_cache->sec, sec_cache->relocs);
5240 if (sec_cache->ptbl)
5241 free (sec_cache->ptbl);
5242 memset (sec_cache, 0, sizeof (sec_cache));
5248 section_cache_section (section_cache_t *sec_cache,
5250 struct bfd_link_info *link_info)
5253 property_table_entry *prop_table = NULL;
5255 bfd_byte *contents = NULL;
5256 Elf_Internal_Rela *internal_relocs = NULL;
5257 bfd_size_type sec_size;
5261 if (sec == sec_cache->sec)
5265 sec_size = bfd_get_section_limit (abfd, sec);
5267 /* Get the contents. */
5268 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
5269 if (contents == NULL && sec_size != 0)
5272 /* Get the relocations. */
5273 internal_relocs = retrieve_internal_relocs (abfd, sec,
5274 link_info->keep_memory);
5276 /* Get the entry table. */
5277 ptblsize = xtensa_read_table_entries (abfd, sec, &prop_table,
5278 XTENSA_PROP_SEC_NAME, FALSE);
5282 /* Fill in the new section cache. */
5283 clear_section_cache (sec_cache);
5284 memset (sec_cache, 0, sizeof (sec_cache));
5286 sec_cache->sec = sec;
5287 sec_cache->contents = contents;
5288 sec_cache->content_length = sec_size;
5289 sec_cache->relocs = internal_relocs;
5290 sec_cache->reloc_count = sec->reloc_count;
5291 sec_cache->pte_count = ptblsize;
5292 sec_cache->ptbl = prop_table;
5297 release_contents (sec, contents);
5298 release_internal_relocs (sec, internal_relocs);
5305 /* Extended basic blocks. */
5307 /* An ebb_struct represents an Extended Basic Block. Within this
5308 range, we guarantee that all instructions are decodable, the
5309 property table entries are contiguous, and no property table
5310 specifies a segment that cannot have instructions moved. This
5311 structure contains caches of the contents, property table and
5312 relocations for the specified section for easy use. The range is
5313 specified by ranges of indices for the byte offset, property table
5314 offsets and relocation offsets. These must be consistent. */
5316 typedef struct ebb_struct ebb_t;
5322 bfd_byte *contents; /* Cache of the section contents. */
5323 bfd_size_type content_length;
5325 property_table_entry *ptbl; /* Cache of the section property table. */
5328 Elf_Internal_Rela *relocs; /* Cache of the section relocations. */
5329 unsigned reloc_count;
5331 bfd_vma start_offset; /* Offset in section. */
5332 unsigned start_ptbl_idx; /* Offset in the property table. */
5333 unsigned start_reloc_idx; /* Offset in the relocations. */
5336 unsigned end_ptbl_idx;
5337 unsigned end_reloc_idx;
5339 bfd_boolean ends_section; /* Is this the last ebb in a section? */
5341 /* The unreachable property table at the end of this set of blocks;
5342 NULL if the end is not an unreachable block. */
5343 property_table_entry *ends_unreachable;
5347 enum ebb_target_enum
5350 EBB_DESIRE_TGT_ALIGN,
5351 EBB_REQUIRE_TGT_ALIGN,
5352 EBB_REQUIRE_LOOP_ALIGN,
5357 /* proposed_action_struct is similar to the text_action_struct except
5358 that is represents a potential transformation, not one that will
5359 occur. We build a list of these for an extended basic block
5360 and use them to compute the actual actions desired. We must be
5361 careful that the entire set of actual actions we perform do not
5362 break any relocations that would fit if the actions were not
5365 typedef struct proposed_action_struct proposed_action;
5367 struct proposed_action_struct
5369 enum ebb_target_enum align_type; /* for the target alignment */
5370 bfd_vma alignment_pow;
5371 text_action_t action;
5374 bfd_boolean do_action; /* If false, then we will not perform the action. */
5378 /* The ebb_constraint_struct keeps a set of proposed actions for an
5379 extended basic block. */
5381 typedef struct ebb_constraint_struct ebb_constraint;
5383 struct ebb_constraint_struct
5386 bfd_boolean start_movable;
5388 /* Bytes of extra space at the beginning if movable. */
5389 int start_extra_space;
5391 enum ebb_target_enum start_align;
5393 bfd_boolean end_movable;
5395 /* Bytes of extra space at the end if movable. */
5396 int end_extra_space;
5398 unsigned action_count;
5399 unsigned action_allocated;
5401 /* Array of proposed actions. */
5402 proposed_action *actions;
5404 /* Action alignments -- one for each proposed action. */
5405 enum ebb_target_enum *action_aligns;
5410 init_ebb_constraint (ebb_constraint *c)
5412 memset (c, 0, sizeof (ebb_constraint));
5417 free_ebb_constraint (ebb_constraint *c)
5425 init_ebb (ebb_t *ebb,
5428 bfd_size_type content_length,
5429 property_table_entry *prop_table,
5431 Elf_Internal_Rela *internal_relocs,
5432 unsigned reloc_count)
5434 memset (ebb, 0, sizeof (ebb_t));
5436 ebb->contents = contents;
5437 ebb->content_length = content_length;
5438 ebb->ptbl = prop_table;
5439 ebb->pte_count = ptblsize;
5440 ebb->relocs = internal_relocs;
5441 ebb->reloc_count = reloc_count;
5442 ebb->start_offset = 0;
5443 ebb->end_offset = ebb->content_length - 1;
5444 ebb->start_ptbl_idx = 0;
5445 ebb->end_ptbl_idx = ptblsize;
5446 ebb->start_reloc_idx = 0;
5447 ebb->end_reloc_idx = reloc_count;
5451 /* Extend the ebb to all decodable contiguous sections. The algorithm
5452 for building a basic block around an instruction is to push it
5453 forward until we hit the end of a section, an unreachable block or
5454 a block that cannot be transformed. Then we push it backwards
5455 searching for similar conditions. */
5457 static bfd_boolean extend_ebb_bounds_forward (ebb_t *);
5458 static bfd_boolean extend_ebb_bounds_backward (ebb_t *);
5459 static bfd_size_type insn_block_decodable_len
5460 (bfd_byte *, bfd_size_type, bfd_vma, bfd_size_type);
5463 extend_ebb_bounds (ebb_t *ebb)
5465 if (!extend_ebb_bounds_forward (ebb))
5467 if (!extend_ebb_bounds_backward (ebb))
5474 extend_ebb_bounds_forward (ebb_t *ebb)
5476 property_table_entry *the_entry, *new_entry;
5478 the_entry = &ebb->ptbl[ebb->end_ptbl_idx];
5480 /* Stop when (1) we cannot decode an instruction, (2) we are at
5481 the end of the property tables, (3) we hit a non-contiguous property
5482 table entry, (4) we hit a NO_TRANSFORM region. */
5487 bfd_size_type insn_block_len;
5489 entry_end = the_entry->address - ebb->sec->vma + the_entry->size;
5491 insn_block_decodable_len (ebb->contents, ebb->content_length,
5493 entry_end - ebb->end_offset);
5494 if (insn_block_len != (entry_end - ebb->end_offset))
5496 (*_bfd_error_handler)
5497 (_("%B(%A+0x%lx): could not decode instruction; possible configuration mismatch"),
5498 ebb->sec->owner, ebb->sec, ebb->end_offset + insn_block_len);
5501 ebb->end_offset += insn_block_len;
5503 if (ebb->end_offset == ebb->sec->size)
5504 ebb->ends_section = TRUE;
5506 /* Update the reloc counter. */
5507 while (ebb->end_reloc_idx + 1 < ebb->reloc_count
5508 && (ebb->relocs[ebb->end_reloc_idx + 1].r_offset
5511 ebb->end_reloc_idx++;
5514 if (ebb->end_ptbl_idx + 1 == ebb->pte_count)
5517 new_entry = &ebb->ptbl[ebb->end_ptbl_idx + 1];
5518 if (((new_entry->flags & XTENSA_PROP_INSN) == 0)
5519 || ((new_entry->flags & XTENSA_PROP_NO_TRANSFORM) != 0)
5520 || ((the_entry->flags & XTENSA_PROP_ALIGN) != 0))
5523 if (the_entry->address + the_entry->size != new_entry->address)
5526 the_entry = new_entry;
5527 ebb->end_ptbl_idx++;
5530 /* Quick check for an unreachable or end of file just at the end. */
5531 if (ebb->end_ptbl_idx + 1 == ebb->pte_count)
5533 if (ebb->end_offset == ebb->content_length)
5534 ebb->ends_section = TRUE;
5538 new_entry = &ebb->ptbl[ebb->end_ptbl_idx + 1];
5539 if ((new_entry->flags & XTENSA_PROP_UNREACHABLE) != 0
5540 && the_entry->address + the_entry->size == new_entry->address)
5541 ebb->ends_unreachable = new_entry;
5544 /* Any other ending requires exact alignment. */
5550 extend_ebb_bounds_backward (ebb_t *ebb)
5552 property_table_entry *the_entry, *new_entry;
5554 the_entry = &ebb->ptbl[ebb->start_ptbl_idx];
5556 /* Stop when (1) we cannot decode the instructions in the current entry.
5557 (2) we are at the beginning of the property tables, (3) we hit a
5558 non-contiguous property table entry, (4) we hit a NO_TRANSFORM region. */
5562 bfd_vma block_begin;
5563 bfd_size_type insn_block_len;
5565 block_begin = the_entry->address - ebb->sec->vma;
5567 insn_block_decodable_len (ebb->contents, ebb->content_length,
5569 ebb->start_offset - block_begin);
5570 if (insn_block_len != ebb->start_offset - block_begin)
5572 (*_bfd_error_handler)
5573 (_("%B(%A+0x%lx): could not decode instruction; possible configuration mismatch"),
5574 ebb->sec->owner, ebb->sec, ebb->end_offset + insn_block_len);
5577 ebb->start_offset -= insn_block_len;
5579 /* Update the reloc counter. */
5580 while (ebb->start_reloc_idx > 0
5581 && (ebb->relocs[ebb->start_reloc_idx - 1].r_offset
5582 >= ebb->start_offset))
5584 ebb->start_reloc_idx--;
5587 if (ebb->start_ptbl_idx == 0)
5590 new_entry = &ebb->ptbl[ebb->start_ptbl_idx - 1];
5591 if ((new_entry->flags & XTENSA_PROP_INSN) == 0
5592 || ((new_entry->flags & XTENSA_PROP_NO_TRANSFORM) != 0)
5593 || ((new_entry->flags & XTENSA_PROP_ALIGN) != 0))
5595 if (new_entry->address + new_entry->size != the_entry->address)
5598 the_entry = new_entry;
5599 ebb->start_ptbl_idx--;
5605 static bfd_size_type
5606 insn_block_decodable_len (bfd_byte *contents,
5607 bfd_size_type content_len,
5608 bfd_vma block_offset,
5609 bfd_size_type block_len)
5611 bfd_vma offset = block_offset;
5613 while (offset < block_offset + block_len)
5615 bfd_size_type insn_len = 0;
5617 insn_len = insn_decode_len (contents, content_len, offset);
5619 return (offset - block_offset);
5622 return (offset - block_offset);
5627 ebb_propose_action (ebb_constraint *c,
5628 enum ebb_target_enum align_type,
5629 bfd_vma alignment_pow,
5630 text_action_t action,
5633 bfd_boolean do_action)
5635 proposed_action *act;
5637 if (c->action_allocated <= c->action_count)
5639 unsigned new_allocated, i;
5640 proposed_action *new_actions;
5642 new_allocated = (c->action_count + 2) * 2;
5643 new_actions = (proposed_action *)
5644 bfd_zmalloc (sizeof (proposed_action) * new_allocated);
5646 for (i = 0; i < c->action_count; i++)
5647 new_actions[i] = c->actions[i];
5650 c->actions = new_actions;
5651 c->action_allocated = new_allocated;
5654 act = &c->actions[c->action_count];
5655 act->align_type = align_type;
5656 act->alignment_pow = alignment_pow;
5657 act->action = action;
5658 act->offset = offset;
5659 act->removed_bytes = removed_bytes;
5660 act->do_action = do_action;
5666 /* Access to internal relocations, section contents and symbols. */
5668 /* During relaxation, we need to modify relocations, section contents,
5669 and symbol definitions, and we need to keep the original values from
5670 being reloaded from the input files, i.e., we need to "pin" the
5671 modified values in memory. We also want to continue to observe the
5672 setting of the "keep-memory" flag. The following functions wrap the
5673 standard BFD functions to take care of this for us. */
5675 static Elf_Internal_Rela *
5676 retrieve_internal_relocs (bfd *abfd, asection *sec, bfd_boolean keep_memory)
5678 Elf_Internal_Rela *internal_relocs;
5680 if ((sec->flags & SEC_LINKER_CREATED) != 0)
5683 internal_relocs = elf_section_data (sec)->relocs;
5684 if (internal_relocs == NULL)
5685 internal_relocs = (_bfd_elf_link_read_relocs
5686 (abfd, sec, NULL, NULL, keep_memory));
5687 return internal_relocs;
5692 pin_internal_relocs (asection *sec, Elf_Internal_Rela *internal_relocs)
5694 elf_section_data (sec)->relocs = internal_relocs;
5699 release_internal_relocs (asection *sec, Elf_Internal_Rela *internal_relocs)
5702 && elf_section_data (sec)->relocs != internal_relocs)
5703 free (internal_relocs);
5708 retrieve_contents (bfd *abfd, asection *sec, bfd_boolean keep_memory)
5711 bfd_size_type sec_size;
5713 sec_size = bfd_get_section_limit (abfd, sec);
5714 contents = elf_section_data (sec)->this_hdr.contents;
5716 if (contents == NULL && sec_size != 0)
5718 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
5725 elf_section_data (sec)->this_hdr.contents = contents;
5732 pin_contents (asection *sec, bfd_byte *contents)
5734 elf_section_data (sec)->this_hdr.contents = contents;
5739 release_contents (asection *sec, bfd_byte *contents)
5741 if (contents && elf_section_data (sec)->this_hdr.contents != contents)
5746 static Elf_Internal_Sym *
5747 retrieve_local_syms (bfd *input_bfd)
5749 Elf_Internal_Shdr *symtab_hdr;
5750 Elf_Internal_Sym *isymbuf;
5753 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
5754 locsymcount = symtab_hdr->sh_info;
5756 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
5757 if (isymbuf == NULL && locsymcount != 0)
5758 isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, locsymcount, 0,
5761 /* Save the symbols for this input file so they won't be read again. */
5762 if (isymbuf && isymbuf != (Elf_Internal_Sym *) symtab_hdr->contents)
5763 symtab_hdr->contents = (unsigned char *) isymbuf;
5769 /* Code for link-time relaxation. */
5771 /* Initialization for relaxation: */
5772 static bfd_boolean analyze_relocations (struct bfd_link_info *);
5773 static bfd_boolean find_relaxable_sections
5774 (bfd *, asection *, struct bfd_link_info *, bfd_boolean *);
5775 static bfd_boolean collect_source_relocs
5776 (bfd *, asection *, struct bfd_link_info *);
5777 static bfd_boolean is_resolvable_asm_expansion
5778 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, struct bfd_link_info *,
5780 static Elf_Internal_Rela *find_associated_l32r_irel
5781 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, Elf_Internal_Rela *);
5782 static bfd_boolean compute_text_actions
5783 (bfd *, asection *, struct bfd_link_info *);
5784 static bfd_boolean compute_ebb_proposed_actions (ebb_constraint *);
5785 static bfd_boolean compute_ebb_actions (ebb_constraint *);
5786 static bfd_boolean check_section_ebb_pcrels_fit
5787 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, const ebb_constraint *,
5788 const xtensa_opcode *);
5789 static bfd_boolean check_section_ebb_reduces (const ebb_constraint *);
5790 static void text_action_add_proposed
5791 (text_action_list *, const ebb_constraint *, asection *);
5792 static int compute_fill_extra_space (property_table_entry *);
5795 static bfd_boolean compute_removed_literals
5796 (bfd *, asection *, struct bfd_link_info *, value_map_hash_table *);
5797 static Elf_Internal_Rela *get_irel_at_offset
5798 (asection *, Elf_Internal_Rela *, bfd_vma);
5799 static bfd_boolean is_removable_literal
5800 (const source_reloc *, int, const source_reloc *, int, asection *,
5801 property_table_entry *, int);
5802 static bfd_boolean remove_dead_literal
5803 (bfd *, asection *, struct bfd_link_info *, Elf_Internal_Rela *,
5804 Elf_Internal_Rela *, source_reloc *, property_table_entry *, int);
5805 static bfd_boolean identify_literal_placement
5806 (bfd *, asection *, bfd_byte *, struct bfd_link_info *,
5807 value_map_hash_table *, bfd_boolean *, Elf_Internal_Rela *, int,
5808 source_reloc *, property_table_entry *, int, section_cache_t *,
5810 static bfd_boolean relocations_reach (source_reloc *, int, const r_reloc *);
5811 static bfd_boolean coalesce_shared_literal
5812 (asection *, source_reloc *, property_table_entry *, int, value_map *);
5813 static bfd_boolean move_shared_literal
5814 (asection *, struct bfd_link_info *, source_reloc *, property_table_entry *,
5815 int, const r_reloc *, const literal_value *, section_cache_t *);
5818 static bfd_boolean relax_section (bfd *, asection *, struct bfd_link_info *);
5819 static bfd_boolean translate_section_fixes (asection *);
5820 static bfd_boolean translate_reloc_bfd_fix (reloc_bfd_fix *);
5821 static asection *translate_reloc (const r_reloc *, r_reloc *, asection *);
5822 static void shrink_dynamic_reloc_sections
5823 (struct bfd_link_info *, bfd *, asection *, Elf_Internal_Rela *);
5824 static bfd_boolean move_literal
5825 (bfd *, struct bfd_link_info *, asection *, bfd_vma, bfd_byte *,
5826 xtensa_relax_info *, Elf_Internal_Rela **, const literal_value *);
5827 static bfd_boolean relax_property_section
5828 (bfd *, asection *, struct bfd_link_info *);
5831 static bfd_boolean relax_section_symbols (bfd *, asection *);
5835 elf_xtensa_relax_section (bfd *abfd,
5837 struct bfd_link_info *link_info,
5840 static value_map_hash_table *values = NULL;
5841 static bfd_boolean relocations_analyzed = FALSE;
5842 xtensa_relax_info *relax_info;
5844 if (!relocations_analyzed)
5846 /* Do some overall initialization for relaxation. */
5847 values = value_map_hash_table_init ();
5850 relaxing_section = TRUE;
5851 if (!analyze_relocations (link_info))
5853 relocations_analyzed = TRUE;
5857 /* Don't mess with linker-created sections. */
5858 if ((sec->flags & SEC_LINKER_CREATED) != 0)
5861 relax_info = get_xtensa_relax_info (sec);
5862 BFD_ASSERT (relax_info != NULL);
5864 switch (relax_info->visited)
5867 /* Note: It would be nice to fold this pass into
5868 analyze_relocations, but it is important for this step that the
5869 sections be examined in link order. */
5870 if (!compute_removed_literals (abfd, sec, link_info, values))
5877 value_map_hash_table_delete (values);
5879 if (!relax_section (abfd, sec, link_info))
5885 if (!relax_section_symbols (abfd, sec))
5890 relax_info->visited++;
5895 /* Initialization for relaxation. */
5897 /* This function is called once at the start of relaxation. It scans
5898 all the input sections and marks the ones that are relaxable (i.e.,
5899 literal sections with L32R relocations against them), and then
5900 collects source_reloc information for all the relocations against
5901 those relaxable sections. During this process, it also detects
5902 longcalls, i.e., calls relaxed by the assembler into indirect
5903 calls, that can be optimized back into direct calls. Within each
5904 extended basic block (ebb) containing an optimized longcall, it
5905 computes a set of "text actions" that can be performed to remove
5906 the L32R associated with the longcall while optionally preserving
5907 branch target alignments. */
5910 analyze_relocations (struct bfd_link_info *link_info)
5914 bfd_boolean is_relaxable = FALSE;
5916 /* Initialize the per-section relaxation info. */
5917 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next)
5918 for (sec = abfd->sections; sec != NULL; sec = sec->next)
5920 init_xtensa_relax_info (sec);
5923 /* Mark relaxable sections (and count relocations against each one). */
5924 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next)
5925 for (sec = abfd->sections; sec != NULL; sec = sec->next)
5927 if (!find_relaxable_sections (abfd, sec, link_info, &is_relaxable))
5931 /* Bail out if there are no relaxable sections. */
5935 /* Allocate space for source_relocs. */
5936 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next)
5937 for (sec = abfd->sections; sec != NULL; sec = sec->next)
5939 xtensa_relax_info *relax_info;
5941 relax_info = get_xtensa_relax_info (sec);
5942 if (relax_info->is_relaxable_literal_section
5943 || relax_info->is_relaxable_asm_section)
5945 relax_info->src_relocs = (source_reloc *)
5946 bfd_malloc (relax_info->src_count * sizeof (source_reloc));
5949 relax_info->src_count = 0;
5952 /* Collect info on relocations against each relaxable section. */
5953 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next)
5954 for (sec = abfd->sections; sec != NULL; sec = sec->next)
5956 if (!collect_source_relocs (abfd, sec, link_info))
5960 /* Compute the text actions. */
5961 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next)
5962 for (sec = abfd->sections; sec != NULL; sec = sec->next)
5964 if (!compute_text_actions (abfd, sec, link_info))
5972 /* Find all the sections that might be relaxed. The motivation for
5973 this pass is that collect_source_relocs() needs to record _all_ the
5974 relocations that target each relaxable section. That is expensive
5975 and unnecessary unless the target section is actually going to be
5976 relaxed. This pass identifies all such sections by checking if
5977 they have L32Rs pointing to them. In the process, the total number
5978 of relocations targeting each section is also counted so that we
5979 know how much space to allocate for source_relocs against each
5980 relaxable literal section. */
5983 find_relaxable_sections (bfd *abfd,
5985 struct bfd_link_info *link_info,
5986 bfd_boolean *is_relaxable_p)
5988 Elf_Internal_Rela *internal_relocs;
5990 bfd_boolean ok = TRUE;
5992 xtensa_relax_info *source_relax_info;
5993 bfd_boolean is_l32r_reloc;
5995 internal_relocs = retrieve_internal_relocs (abfd, sec,
5996 link_info->keep_memory);
5997 if (internal_relocs == NULL)
6000 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
6001 if (contents == NULL && sec->size != 0)
6007 source_relax_info = get_xtensa_relax_info (sec);
6008 for (i = 0; i < sec->reloc_count; i++)
6010 Elf_Internal_Rela *irel = &internal_relocs[i];
6012 asection *target_sec;
6013 xtensa_relax_info *target_relax_info;
6015 /* If this section has not already been marked as "relaxable", and
6016 if it contains any ASM_EXPAND relocations (marking expanded
6017 longcalls) that can be optimized into direct calls, then mark
6018 the section as "relaxable". */
6019 if (source_relax_info
6020 && !source_relax_info->is_relaxable_asm_section
6021 && ELF32_R_TYPE (irel->r_info) == R_XTENSA_ASM_EXPAND)
6023 bfd_boolean is_reachable = FALSE;
6024 if (is_resolvable_asm_expansion (abfd, sec, contents, irel,
6025 link_info, &is_reachable)
6028 source_relax_info->is_relaxable_asm_section = TRUE;
6029 *is_relaxable_p = TRUE;
6033 r_reloc_init (&r_rel, abfd, irel, contents,
6034 bfd_get_section_limit (abfd, sec));
6036 target_sec = r_reloc_get_section (&r_rel);
6037 target_relax_info = get_xtensa_relax_info (target_sec);
6038 if (!target_relax_info)
6041 /* Count PC-relative operand relocations against the target section.
6042 Note: The conditions tested here must match the conditions under
6043 which init_source_reloc is called in collect_source_relocs(). */
6044 is_l32r_reloc = FALSE;
6045 if (is_operand_relocation (ELF32_R_TYPE (irel->r_info)))
6047 xtensa_opcode opcode =
6048 get_relocation_opcode (abfd, sec, contents, irel);
6049 if (opcode != XTENSA_UNDEFINED)
6051 is_l32r_reloc = (opcode == get_l32r_opcode ());
6052 if (!is_alt_relocation (ELF32_R_TYPE (irel->r_info))
6054 target_relax_info->src_count++;
6058 if (is_l32r_reloc && r_reloc_is_defined (&r_rel))
6060 /* Mark the target section as relaxable. */
6061 target_relax_info->is_relaxable_literal_section = TRUE;
6062 *is_relaxable_p = TRUE;
6067 release_contents (sec, contents);
6068 release_internal_relocs (sec, internal_relocs);
6073 /* Record _all_ the relocations that point to relaxable sections, and
6074 get rid of ASM_EXPAND relocs by either converting them to
6075 ASM_SIMPLIFY or by removing them. */
6078 collect_source_relocs (bfd *abfd,
6080 struct bfd_link_info *link_info)
6082 Elf_Internal_Rela *internal_relocs;
6084 bfd_boolean ok = TRUE;
6086 bfd_size_type sec_size;
6088 internal_relocs = retrieve_internal_relocs (abfd, sec,
6089 link_info->keep_memory);
6090 if (internal_relocs == NULL)
6093 sec_size = bfd_get_section_limit (abfd, sec);
6094 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
6095 if (contents == NULL && sec_size != 0)
6101 /* Record relocations against relaxable literal sections. */
6102 for (i = 0; i < sec->reloc_count; i++)
6104 Elf_Internal_Rela *irel = &internal_relocs[i];
6106 asection *target_sec;
6107 xtensa_relax_info *target_relax_info;
6109 r_reloc_init (&r_rel, abfd, irel, contents, sec_size);
6111 target_sec = r_reloc_get_section (&r_rel);
6112 target_relax_info = get_xtensa_relax_info (target_sec);
6114 if (target_relax_info
6115 && (target_relax_info->is_relaxable_literal_section
6116 || target_relax_info->is_relaxable_asm_section))
6118 xtensa_opcode opcode = XTENSA_UNDEFINED;
6120 bfd_boolean is_abs_literal = FALSE;
6122 if (is_alt_relocation (ELF32_R_TYPE (irel->r_info)))
6124 /* None of the current alternate relocs are PC-relative,
6125 and only PC-relative relocs matter here. However, we
6126 still need to record the opcode for literal
6128 opcode = get_relocation_opcode (abfd, sec, contents, irel);
6129 if (opcode == get_l32r_opcode ())
6131 is_abs_literal = TRUE;
6135 opcode = XTENSA_UNDEFINED;
6137 else if (is_operand_relocation (ELF32_R_TYPE (irel->r_info)))
6139 opcode = get_relocation_opcode (abfd, sec, contents, irel);
6140 opnd = get_relocation_opnd (opcode, ELF32_R_TYPE (irel->r_info));
6143 if (opcode != XTENSA_UNDEFINED)
6145 int src_next = target_relax_info->src_next++;
6146 source_reloc *s_reloc = &target_relax_info->src_relocs[src_next];
6148 init_source_reloc (s_reloc, sec, &r_rel, opcode, opnd,
6154 /* Now get rid of ASM_EXPAND relocations. At this point, the
6155 src_relocs array for the target literal section may still be
6156 incomplete, but it must at least contain the entries for the L32R
6157 relocations associated with ASM_EXPANDs because they were just
6158 added in the preceding loop over the relocations. */
6160 for (i = 0; i < sec->reloc_count; i++)
6162 Elf_Internal_Rela *irel = &internal_relocs[i];
6163 bfd_boolean is_reachable;
6165 if (!is_resolvable_asm_expansion (abfd, sec, contents, irel, link_info,
6171 Elf_Internal_Rela *l32r_irel;
6173 asection *target_sec;
6174 xtensa_relax_info *target_relax_info;
6176 /* Mark the source_reloc for the L32R so that it will be
6177 removed in compute_removed_literals(), along with the
6178 associated literal. */
6179 l32r_irel = find_associated_l32r_irel (abfd, sec, contents,
6180 irel, internal_relocs);
6181 if (l32r_irel == NULL)
6184 r_reloc_init (&r_rel, abfd, l32r_irel, contents, sec_size);
6186 target_sec = r_reloc_get_section (&r_rel);
6187 target_relax_info = get_xtensa_relax_info (target_sec);
6189 if (target_relax_info
6190 && (target_relax_info->is_relaxable_literal_section
6191 || target_relax_info->is_relaxable_asm_section))
6193 source_reloc *s_reloc;
6195 /* Search the source_relocs for the entry corresponding to
6196 the l32r_irel. Note: The src_relocs array is not yet
6197 sorted, but it wouldn't matter anyway because we're
6198 searching by source offset instead of target offset. */
6199 s_reloc = find_source_reloc (target_relax_info->src_relocs,
6200 target_relax_info->src_next,
6202 BFD_ASSERT (s_reloc);
6203 s_reloc->is_null = TRUE;
6206 /* Convert this reloc to ASM_SIMPLIFY. */
6207 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
6208 R_XTENSA_ASM_SIMPLIFY);
6209 l32r_irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
6211 pin_internal_relocs (sec, internal_relocs);
6215 /* It is resolvable but doesn't reach. We resolve now
6216 by eliminating the relocation -- the call will remain
6217 expanded into L32R/CALLX. */
6218 irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
6219 pin_internal_relocs (sec, internal_relocs);
6224 release_contents (sec, contents);
6225 release_internal_relocs (sec, internal_relocs);
6230 /* Return TRUE if the asm expansion can be resolved. Generally it can
6231 be resolved on a final link or when a partial link locates it in the
6232 same section as the target. Set "is_reachable" flag if the target of
6233 the call is within the range of a direct call, given the current VMA
6234 for this section and the target section. */
6237 is_resolvable_asm_expansion (bfd *abfd,
6240 Elf_Internal_Rela *irel,
6241 struct bfd_link_info *link_info,
6242 bfd_boolean *is_reachable_p)
6244 asection *target_sec;
6245 bfd_vma target_offset;
6247 xtensa_opcode opcode, direct_call_opcode;
6248 bfd_vma self_address;
6249 bfd_vma dest_address;
6250 bfd_boolean uses_l32r;
6251 bfd_size_type sec_size;
6253 *is_reachable_p = FALSE;
6255 if (contents == NULL)
6258 if (ELF32_R_TYPE (irel->r_info) != R_XTENSA_ASM_EXPAND)
6261 sec_size = bfd_get_section_limit (abfd, sec);
6262 opcode = get_expanded_call_opcode (contents + irel->r_offset,
6263 sec_size - irel->r_offset, &uses_l32r);
6264 /* Optimization of longcalls that use CONST16 is not yet implemented. */
6268 direct_call_opcode = swap_callx_for_call_opcode (opcode);
6269 if (direct_call_opcode == XTENSA_UNDEFINED)
6272 /* Check and see that the target resolves. */
6273 r_reloc_init (&r_rel, abfd, irel, contents, sec_size);
6274 if (!r_reloc_is_defined (&r_rel))
6277 target_sec = r_reloc_get_section (&r_rel);
6278 target_offset = r_rel.target_offset;
6280 /* If the target is in a shared library, then it doesn't reach. This
6281 isn't supposed to come up because the compiler should never generate
6282 non-PIC calls on systems that use shared libraries, but the linker
6283 shouldn't crash regardless. */
6284 if (!target_sec->output_section)
6287 /* For relocatable sections, we can only simplify when the output
6288 section of the target is the same as the output section of the
6290 if (link_info->relocatable
6291 && (target_sec->output_section != sec->output_section
6292 || is_reloc_sym_weak (abfd, irel)))
6295 self_address = (sec->output_section->vma
6296 + sec->output_offset + irel->r_offset + 3);
6297 dest_address = (target_sec->output_section->vma
6298 + target_sec->output_offset + target_offset);
6300 *is_reachable_p = pcrel_reloc_fits (direct_call_opcode, 0,
6301 self_address, dest_address);
6303 if ((self_address >> CALL_SEGMENT_BITS) !=
6304 (dest_address >> CALL_SEGMENT_BITS))
6311 static Elf_Internal_Rela *
6312 find_associated_l32r_irel (bfd *abfd,
6315 Elf_Internal_Rela *other_irel,
6316 Elf_Internal_Rela *internal_relocs)
6320 for (i = 0; i < sec->reloc_count; i++)
6322 Elf_Internal_Rela *irel = &internal_relocs[i];
6324 if (irel == other_irel)
6326 if (irel->r_offset != other_irel->r_offset)
6328 if (is_l32r_relocation (abfd, sec, contents, irel))
6336 static xtensa_opcode *
6337 build_reloc_opcodes (bfd *abfd,
6340 Elf_Internal_Rela *internal_relocs)
6343 xtensa_opcode *reloc_opcodes =
6344 (xtensa_opcode *) bfd_malloc (sizeof (xtensa_opcode) * sec->reloc_count);
6345 for (i = 0; i < sec->reloc_count; i++)
6347 Elf_Internal_Rela *irel = &internal_relocs[i];
6348 reloc_opcodes[i] = get_relocation_opcode (abfd, sec, contents, irel);
6350 return reloc_opcodes;
6354 /* The compute_text_actions function will build a list of potential
6355 transformation actions for code in the extended basic block of each
6356 longcall that is optimized to a direct call. From this list we
6357 generate a set of actions to actually perform that optimizes for
6358 space and, if not using size_opt, maintains branch target
6361 These actions to be performed are placed on a per-section list.
6362 The actual changes are performed by relax_section() in the second
6366 compute_text_actions (bfd *abfd,
6368 struct bfd_link_info *link_info)
6370 xtensa_opcode *reloc_opcodes = NULL;
6371 xtensa_relax_info *relax_info;
6373 Elf_Internal_Rela *internal_relocs;
6374 bfd_boolean ok = TRUE;
6376 property_table_entry *prop_table = 0;
6378 bfd_size_type sec_size;
6380 relax_info = get_xtensa_relax_info (sec);
6381 BFD_ASSERT (relax_info);
6382 BFD_ASSERT (relax_info->src_next == relax_info->src_count);
6384 /* Do nothing if the section contains no optimized longcalls. */
6385 if (!relax_info->is_relaxable_asm_section)
6388 internal_relocs = retrieve_internal_relocs (abfd, sec,
6389 link_info->keep_memory);
6391 if (internal_relocs)
6392 qsort (internal_relocs, sec->reloc_count, sizeof (Elf_Internal_Rela),
6393 internal_reloc_compare);
6395 sec_size = bfd_get_section_limit (abfd, sec);
6396 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
6397 if (contents == NULL && sec_size != 0)
6403 ptblsize = xtensa_read_table_entries (abfd, sec, &prop_table,
6404 XTENSA_PROP_SEC_NAME, FALSE);
6411 for (i = 0; i < sec->reloc_count; i++)
6413 Elf_Internal_Rela *irel = &internal_relocs[i];
6415 property_table_entry *the_entry;
6418 ebb_constraint ebb_table;
6419 bfd_size_type simplify_size;
6421 if (irel && ELF32_R_TYPE (irel->r_info) != R_XTENSA_ASM_SIMPLIFY)
6423 r_offset = irel->r_offset;
6425 simplify_size = get_asm_simplify_size (contents, sec_size, r_offset);
6426 if (simplify_size == 0)
6428 (*_bfd_error_handler)
6429 (_("%B(%A+0x%lx): could not decode instruction for XTENSA_ASM_SIMPLIFY relocation; possible configuration mismatch"),
6430 sec->owner, sec, r_offset);
6434 /* If the instruction table is not around, then don't do this
6436 the_entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
6437 sec->vma + irel->r_offset);
6438 if (the_entry == NULL || XTENSA_NO_NOP_REMOVAL)
6440 text_action_add (&relax_info->action_list,
6441 ta_convert_longcall, sec, r_offset,
6446 /* If the next longcall happens to be at the same address as an
6447 unreachable section of size 0, then skip forward. */
6448 ptbl_idx = the_entry - prop_table;
6449 while ((the_entry->flags & XTENSA_PROP_UNREACHABLE)
6450 && the_entry->size == 0
6451 && ptbl_idx + 1 < ptblsize
6452 && (prop_table[ptbl_idx + 1].address
6453 == prop_table[ptbl_idx].address))
6459 if (the_entry->flags & XTENSA_PROP_NO_TRANSFORM)
6460 /* NO_REORDER is OK */
6463 init_ebb_constraint (&ebb_table);
6464 ebb = &ebb_table.ebb;
6465 init_ebb (ebb, sec, contents, sec_size, prop_table, ptblsize,
6466 internal_relocs, sec->reloc_count);
6467 ebb->start_offset = r_offset + simplify_size;
6468 ebb->end_offset = r_offset + simplify_size;
6469 ebb->start_ptbl_idx = ptbl_idx;
6470 ebb->end_ptbl_idx = ptbl_idx;
6471 ebb->start_reloc_idx = i;
6472 ebb->end_reloc_idx = i;
6474 /* Precompute the opcode for each relocation. */
6475 if (reloc_opcodes == NULL)
6476 reloc_opcodes = build_reloc_opcodes (abfd, sec, contents,
6479 if (!extend_ebb_bounds (ebb)
6480 || !compute_ebb_proposed_actions (&ebb_table)
6481 || !compute_ebb_actions (&ebb_table)
6482 || !check_section_ebb_pcrels_fit (abfd, sec, contents,
6483 internal_relocs, &ebb_table,
6485 || !check_section_ebb_reduces (&ebb_table))
6487 /* If anything goes wrong or we get unlucky and something does
6488 not fit, with our plan because of expansion between
6489 critical branches, just convert to a NOP. */
6491 text_action_add (&relax_info->action_list,
6492 ta_convert_longcall, sec, r_offset, 0);
6493 i = ebb_table.ebb.end_reloc_idx;
6494 free_ebb_constraint (&ebb_table);
6498 text_action_add_proposed (&relax_info->action_list, &ebb_table, sec);
6500 /* Update the index so we do not go looking at the relocations
6501 we have already processed. */
6502 i = ebb_table.ebb.end_reloc_idx;
6503 free_ebb_constraint (&ebb_table);
6507 if (relax_info->action_list.head)
6508 print_action_list (stderr, &relax_info->action_list);
6512 release_contents (sec, contents);
6513 release_internal_relocs (sec, internal_relocs);
6517 free (reloc_opcodes);
6523 /* Do not widen an instruction if it is preceeded by a
6524 loop opcode. It might cause misalignment. */
6527 prev_instr_is_a_loop (bfd_byte *contents,
6528 bfd_size_type content_length,
6529 bfd_size_type offset)
6531 xtensa_opcode prev_opcode;
6535 prev_opcode = insn_decode_opcode (contents, content_length, offset-3, 0);
6536 return (xtensa_opcode_is_loop (xtensa_default_isa, prev_opcode) == 1);
6540 /* Find all of the possible actions for an extended basic block. */
6543 compute_ebb_proposed_actions (ebb_constraint *ebb_table)
6545 const ebb_t *ebb = &ebb_table->ebb;
6546 unsigned rel_idx = ebb->start_reloc_idx;
6547 property_table_entry *entry, *start_entry, *end_entry;
6549 xtensa_isa isa = xtensa_default_isa;
6551 static xtensa_insnbuf insnbuf = NULL;
6552 static xtensa_insnbuf slotbuf = NULL;
6554 if (insnbuf == NULL)
6556 insnbuf = xtensa_insnbuf_alloc (isa);
6557 slotbuf = xtensa_insnbuf_alloc (isa);
6560 start_entry = &ebb->ptbl[ebb->start_ptbl_idx];
6561 end_entry = &ebb->ptbl[ebb->end_ptbl_idx];
6563 for (entry = start_entry; entry <= end_entry; entry++)
6565 bfd_vma start_offset, end_offset;
6566 bfd_size_type insn_len;
6568 start_offset = entry->address - ebb->sec->vma;
6569 end_offset = entry->address + entry->size - ebb->sec->vma;
6571 if (entry == start_entry)
6572 start_offset = ebb->start_offset;
6573 if (entry == end_entry)
6574 end_offset = ebb->end_offset;
6575 offset = start_offset;
6577 if (offset == entry->address - ebb->sec->vma
6578 && (entry->flags & XTENSA_PROP_INSN_BRANCH_TARGET) != 0)
6580 enum ebb_target_enum align_type = EBB_DESIRE_TGT_ALIGN;
6581 BFD_ASSERT (offset != end_offset);
6582 if (offset == end_offset)
6585 insn_len = insn_decode_len (ebb->contents, ebb->content_length,
6590 if (check_branch_target_aligned_address (offset, insn_len))
6591 align_type = EBB_REQUIRE_TGT_ALIGN;
6593 ebb_propose_action (ebb_table, align_type, 0,
6594 ta_none, offset, 0, TRUE);
6597 while (offset != end_offset)
6599 Elf_Internal_Rela *irel;
6600 xtensa_opcode opcode;
6602 while (rel_idx < ebb->end_reloc_idx
6603 && (ebb->relocs[rel_idx].r_offset < offset
6604 || (ebb->relocs[rel_idx].r_offset == offset
6605 && (ELF32_R_TYPE (ebb->relocs[rel_idx].r_info)
6606 != R_XTENSA_ASM_SIMPLIFY))))
6609 /* Check for longcall. */
6610 irel = &ebb->relocs[rel_idx];
6611 if (irel->r_offset == offset
6612 && ELF32_R_TYPE (irel->r_info) == R_XTENSA_ASM_SIMPLIFY)
6614 bfd_size_type simplify_size;
6616 simplify_size = get_asm_simplify_size (ebb->contents,
6617 ebb->content_length,
6619 if (simplify_size == 0)
6622 ebb_propose_action (ebb_table, EBB_NO_ALIGN, 0,
6623 ta_convert_longcall, offset, 0, TRUE);
6625 offset += simplify_size;
6629 if (offset + MIN_INSN_LENGTH > ebb->content_length)
6631 xtensa_insnbuf_from_chars (isa, insnbuf, &ebb->contents[offset],
6632 ebb->content_length - offset);
6633 fmt = xtensa_format_decode (isa, insnbuf);
6634 if (fmt == XTENSA_UNDEFINED)
6636 insn_len = xtensa_format_length (isa, fmt);
6637 if (insn_len == (bfd_size_type) XTENSA_UNDEFINED)
6640 if (xtensa_format_num_slots (isa, fmt) != 1)
6646 xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf);
6647 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
6648 if (opcode == XTENSA_UNDEFINED)
6651 if ((entry->flags & XTENSA_PROP_INSN_NO_DENSITY) == 0
6652 && (entry->flags & XTENSA_PROP_NO_TRANSFORM) == 0
6653 && can_narrow_instruction (slotbuf, fmt, opcode) != 0)
6655 /* Add an instruction narrow action. */
6656 ebb_propose_action (ebb_table, EBB_NO_ALIGN, 0,
6657 ta_narrow_insn, offset, 0, FALSE);
6659 else if ((entry->flags & XTENSA_PROP_NO_TRANSFORM) == 0
6660 && can_widen_instruction (slotbuf, fmt, opcode) != 0
6661 && ! prev_instr_is_a_loop (ebb->contents,
6662 ebb->content_length, offset))
6664 /* Add an instruction widen action. */
6665 ebb_propose_action (ebb_table, EBB_NO_ALIGN, 0,
6666 ta_widen_insn, offset, 0, FALSE);
6668 else if (xtensa_opcode_is_loop (xtensa_default_isa, opcode) == 1)
6670 /* Check for branch targets. */
6671 ebb_propose_action (ebb_table, EBB_REQUIRE_LOOP_ALIGN, 0,
6672 ta_none, offset, 0, TRUE);
6679 if (ebb->ends_unreachable)
6681 ebb_propose_action (ebb_table, EBB_NO_ALIGN, 0,
6682 ta_fill, ebb->end_offset, 0, TRUE);
6688 (*_bfd_error_handler)
6689 (_("%B(%A+0x%lx): could not decode instruction; possible configuration mismatch"),
6690 ebb->sec->owner, ebb->sec, offset);
6695 /* After all of the information has collected about the
6696 transformations possible in an EBB, compute the appropriate actions
6697 here in compute_ebb_actions. We still must check later to make
6698 sure that the actions do not break any relocations. The algorithm
6699 used here is pretty greedy. Basically, it removes as many no-ops
6700 as possible so that the end of the EBB has the same alignment
6701 characteristics as the original. First, it uses narrowing, then
6702 fill space at the end of the EBB, and finally widenings. If that
6703 does not work, it tries again with one fewer no-op removed. The
6704 optimization will only be performed if all of the branch targets
6705 that were aligned before transformation are also aligned after the
6708 When the size_opt flag is set, ignore the branch target alignments,
6709 narrow all wide instructions, and remove all no-ops unless the end
6710 of the EBB prevents it. */
6713 compute_ebb_actions (ebb_constraint *ebb_table)
6717 int removed_bytes = 0;
6718 ebb_t *ebb = &ebb_table->ebb;
6719 unsigned seg_idx_start = 0;
6720 unsigned seg_idx_end = 0;
6722 /* We perform this like the assembler relaxation algorithm: Start by
6723 assuming all instructions are narrow and all no-ops removed; then
6726 /* For each segment of this that has a solid constraint, check to
6727 see if there are any combinations that will keep the constraint.
6729 for (seg_idx_end = 0; seg_idx_end < ebb_table->action_count; seg_idx_end++)
6731 bfd_boolean requires_text_end_align = FALSE;
6732 unsigned longcall_count = 0;
6733 unsigned longcall_convert_count = 0;
6734 unsigned narrowable_count = 0;
6735 unsigned narrowable_convert_count = 0;
6736 unsigned widenable_count = 0;
6737 unsigned widenable_convert_count = 0;
6739 proposed_action *action = NULL;
6740 int align = (1 << ebb_table->ebb.sec->alignment_power);
6742 seg_idx_start = seg_idx_end;
6744 for (i = seg_idx_start; i < ebb_table->action_count; i++)
6746 action = &ebb_table->actions[i];
6747 if (action->action == ta_convert_longcall)
6749 if (action->action == ta_narrow_insn)
6751 if (action->action == ta_widen_insn)
6753 if (action->action == ta_fill)
6755 if (action->align_type == EBB_REQUIRE_LOOP_ALIGN)
6757 if (action->align_type == EBB_REQUIRE_TGT_ALIGN
6758 && !elf32xtensa_size_opt)
6763 if (seg_idx_end == ebb_table->action_count && !ebb->ends_unreachable)
6764 requires_text_end_align = TRUE;
6766 if (elf32xtensa_size_opt && !requires_text_end_align
6767 && action->align_type != EBB_REQUIRE_LOOP_ALIGN
6768 && action->align_type != EBB_REQUIRE_TGT_ALIGN)
6770 longcall_convert_count = longcall_count;
6771 narrowable_convert_count = narrowable_count;
6772 widenable_convert_count = 0;
6776 /* There is a constraint. Convert the max number of longcalls. */
6777 narrowable_convert_count = 0;
6778 longcall_convert_count = 0;
6779 widenable_convert_count = 0;
6781 for (j = 0; j < longcall_count; j++)
6783 int removed = (longcall_count - j) * 3 & (align - 1);
6784 unsigned desire_narrow = (align - removed) & (align - 1);
6785 unsigned desire_widen = removed;
6786 if (desire_narrow <= narrowable_count)
6788 narrowable_convert_count = desire_narrow;
6789 narrowable_convert_count +=
6790 (align * ((narrowable_count - narrowable_convert_count)
6792 longcall_convert_count = (longcall_count - j);
6793 widenable_convert_count = 0;
6796 if (desire_widen <= widenable_count && !elf32xtensa_size_opt)
6798 narrowable_convert_count = 0;
6799 longcall_convert_count = longcall_count - j;
6800 widenable_convert_count = desire_widen;
6806 /* Now the number of conversions are saved. Do them. */
6807 for (i = seg_idx_start; i < seg_idx_end; i++)
6809 action = &ebb_table->actions[i];
6810 switch (action->action)
6812 case ta_convert_longcall:
6813 if (longcall_convert_count != 0)
6815 action->action = ta_remove_longcall;
6816 action->do_action = TRUE;
6817 action->removed_bytes += 3;
6818 longcall_convert_count--;
6821 case ta_narrow_insn:
6822 if (narrowable_convert_count != 0)
6824 action->do_action = TRUE;
6825 action->removed_bytes += 1;
6826 narrowable_convert_count--;
6830 if (widenable_convert_count != 0)
6832 action->do_action = TRUE;
6833 action->removed_bytes -= 1;
6834 widenable_convert_count--;
6843 /* Now we move on to some local opts. Try to remove each of the
6844 remaining longcalls. */
6846 if (ebb_table->ebb.ends_section || ebb_table->ebb.ends_unreachable)
6849 for (i = 0; i < ebb_table->action_count; i++)
6851 int old_removed_bytes = removed_bytes;
6852 proposed_action *action = &ebb_table->actions[i];
6854 if (action->do_action && action->action == ta_convert_longcall)
6856 bfd_boolean bad_alignment = FALSE;
6858 for (j = i + 1; j < ebb_table->action_count; j++)
6860 proposed_action *new_action = &ebb_table->actions[j];
6861 bfd_vma offset = new_action->offset;
6862 if (new_action->align_type == EBB_REQUIRE_TGT_ALIGN)
6864 if (!check_branch_target_aligned
6865 (ebb_table->ebb.contents,
6866 ebb_table->ebb.content_length,
6867 offset, offset - removed_bytes))
6869 bad_alignment = TRUE;
6873 if (new_action->align_type == EBB_REQUIRE_LOOP_ALIGN)
6875 if (!check_loop_aligned (ebb_table->ebb.contents,
6876 ebb_table->ebb.content_length,
6878 offset - removed_bytes))
6880 bad_alignment = TRUE;
6884 if (new_action->action == ta_narrow_insn
6885 && !new_action->do_action
6886 && ebb_table->ebb.sec->alignment_power == 2)
6888 /* Narrow an instruction and we are done. */
6889 new_action->do_action = TRUE;
6890 new_action->removed_bytes += 1;
6891 bad_alignment = FALSE;
6894 if (new_action->action == ta_widen_insn
6895 && new_action->do_action
6896 && ebb_table->ebb.sec->alignment_power == 2)
6898 /* Narrow an instruction and we are done. */
6899 new_action->do_action = FALSE;
6900 new_action->removed_bytes += 1;
6901 bad_alignment = FALSE;
6904 if (new_action->do_action)
6905 removed_bytes += new_action->removed_bytes;
6909 action->removed_bytes += 3;
6910 action->action = ta_remove_longcall;
6911 action->do_action = TRUE;
6914 removed_bytes = old_removed_bytes;
6915 if (action->do_action)
6916 removed_bytes += action->removed_bytes;
6921 for (i = 0; i < ebb_table->action_count; ++i)
6923 proposed_action *action = &ebb_table->actions[i];
6924 if (action->do_action)
6925 removed_bytes += action->removed_bytes;
6928 if ((removed_bytes % (1 << ebb_table->ebb.sec->alignment_power)) != 0
6929 && ebb->ends_unreachable)
6931 proposed_action *action;
6935 BFD_ASSERT (ebb_table->action_count != 0);
6936 action = &ebb_table->actions[ebb_table->action_count - 1];
6937 BFD_ASSERT (action->action == ta_fill);
6938 BFD_ASSERT (ebb->ends_unreachable->flags & XTENSA_PROP_UNREACHABLE);
6940 extra_space = compute_fill_extra_space (ebb->ends_unreachable);
6941 br = action->removed_bytes + removed_bytes + extra_space;
6942 br = br & ((1 << ebb->sec->alignment_power ) - 1);
6944 action->removed_bytes = extra_space - br;
6950 /* The xlate_map is a sorted array of address mappings designed to
6951 answer the offset_with_removed_text() query with a binary search instead
6952 of a linear search through the section's action_list. */
6954 typedef struct xlate_map_entry xlate_map_entry_t;
6955 typedef struct xlate_map xlate_map_t;
6957 struct xlate_map_entry
6959 unsigned orig_address;
6960 unsigned new_address;
6966 unsigned entry_count;
6967 xlate_map_entry_t *entry;
6972 xlate_compare (const void *a_v, const void *b_v)
6974 const xlate_map_entry_t *a = (const xlate_map_entry_t *) a_v;
6975 const xlate_map_entry_t *b = (const xlate_map_entry_t *) b_v;
6976 if (a->orig_address < b->orig_address)
6978 if (a->orig_address > (b->orig_address + b->size - 1))
6985 xlate_offset_with_removed_text (const xlate_map_t *map,
6986 text_action_list *action_list,
6989 xlate_map_entry_t tmp;
6991 xlate_map_entry_t *e;
6994 return offset_with_removed_text (action_list, offset);
6996 if (map->entry_count == 0)
6999 tmp.orig_address = offset;
7000 tmp.new_address = offset;
7003 r = bsearch (&offset, map->entry, map->entry_count,
7004 sizeof (xlate_map_entry_t), &xlate_compare);
7005 e = (xlate_map_entry_t *) r;
7007 BFD_ASSERT (e != NULL);
7010 return e->new_address - e->orig_address + offset;
7014 /* Build a binary searchable offset translation map from a section's
7017 static xlate_map_t *
7018 build_xlate_map (asection *sec, xtensa_relax_info *relax_info)
7020 xlate_map_t *map = (xlate_map_t *) bfd_malloc (sizeof (xlate_map_t));
7021 text_action_list *action_list = &relax_info->action_list;
7022 unsigned num_actions = 0;
7025 xlate_map_entry_t *current_entry;
7030 num_actions = action_list_count (action_list);
7031 map->entry = (xlate_map_entry_t *)
7032 bfd_malloc (sizeof (xlate_map_entry_t) * (num_actions + 1));
7033 if (map->entry == NULL)
7038 map->entry_count = 0;
7041 current_entry = &map->entry[0];
7043 current_entry->orig_address = 0;
7044 current_entry->new_address = 0;
7045 current_entry->size = 0;
7047 for (r = action_list->head; r != NULL; r = r->next)
7049 unsigned orig_size = 0;
7053 case ta_remove_insn:
7054 case ta_convert_longcall:
7055 case ta_remove_literal:
7056 case ta_add_literal:
7058 case ta_remove_longcall:
7061 case ta_narrow_insn:
7070 current_entry->size =
7071 r->offset + orig_size - current_entry->orig_address;
7072 if (current_entry->size != 0)
7077 current_entry->orig_address = r->offset + orig_size;
7078 removed += r->removed_bytes;
7079 current_entry->new_address = r->offset + orig_size - removed;
7080 current_entry->size = 0;
7083 current_entry->size = (bfd_get_section_limit (sec->owner, sec)
7084 - current_entry->orig_address);
7085 if (current_entry->size != 0)
7092 /* Free an offset translation map. */
7095 free_xlate_map (xlate_map_t *map)
7097 if (map && map->entry)
7104 /* Use check_section_ebb_pcrels_fit to make sure that all of the
7105 relocations in a section will fit if a proposed set of actions
7109 check_section_ebb_pcrels_fit (bfd *abfd,
7112 Elf_Internal_Rela *internal_relocs,
7113 const ebb_constraint *constraint,
7114 const xtensa_opcode *reloc_opcodes)
7117 Elf_Internal_Rela *irel;
7118 xlate_map_t *xmap = NULL;
7119 bfd_boolean ok = TRUE;
7120 xtensa_relax_info *relax_info;
7122 relax_info = get_xtensa_relax_info (sec);
7124 if (relax_info && sec->reloc_count > 100)
7126 xmap = build_xlate_map (sec, relax_info);
7127 /* NULL indicates out of memory, but the slow version
7128 can still be used. */
7131 for (i = 0; i < sec->reloc_count; i++)
7134 bfd_vma orig_self_offset, orig_target_offset;
7135 bfd_vma self_offset, target_offset;
7137 reloc_howto_type *howto;
7138 int self_removed_bytes, target_removed_bytes;
7140 irel = &internal_relocs[i];
7141 r_type = ELF32_R_TYPE (irel->r_info);
7143 howto = &elf_howto_table[r_type];
7144 /* We maintain the required invariant: PC-relative relocations
7145 that fit before linking must fit after linking. Thus we only
7146 need to deal with relocations to the same section that are
7148 if (r_type == R_XTENSA_ASM_SIMPLIFY
7149 || r_type == R_XTENSA_32_PCREL
7150 || !howto->pc_relative)
7153 r_reloc_init (&r_rel, abfd, irel, contents,
7154 bfd_get_section_limit (abfd, sec));
7156 if (r_reloc_get_section (&r_rel) != sec)
7159 orig_self_offset = irel->r_offset;
7160 orig_target_offset = r_rel.target_offset;
7162 self_offset = orig_self_offset;
7163 target_offset = orig_target_offset;
7168 xlate_offset_with_removed_text (xmap, &relax_info->action_list,
7171 xlate_offset_with_removed_text (xmap, &relax_info->action_list,
7172 orig_target_offset);
7175 self_removed_bytes = 0;
7176 target_removed_bytes = 0;
7178 for (j = 0; j < constraint->action_count; ++j)
7180 proposed_action *action = &constraint->actions[j];
7181 bfd_vma offset = action->offset;
7182 int removed_bytes = action->removed_bytes;
7183 if (offset < orig_self_offset
7184 || (offset == orig_self_offset && action->action == ta_fill
7185 && action->removed_bytes < 0))
7186 self_removed_bytes += removed_bytes;
7187 if (offset < orig_target_offset
7188 || (offset == orig_target_offset && action->action == ta_fill
7189 && action->removed_bytes < 0))
7190 target_removed_bytes += removed_bytes;
7192 self_offset -= self_removed_bytes;
7193 target_offset -= target_removed_bytes;
7195 /* Try to encode it. Get the operand and check. */
7196 if (is_alt_relocation (ELF32_R_TYPE (irel->r_info)))
7198 /* None of the current alternate relocs are PC-relative,
7199 and only PC-relative relocs matter here. */
7203 xtensa_opcode opcode;
7207 opcode = reloc_opcodes[i];
7209 opcode = get_relocation_opcode (abfd, sec, contents, irel);
7210 if (opcode == XTENSA_UNDEFINED)
7216 opnum = get_relocation_opnd (opcode, ELF32_R_TYPE (irel->r_info));
7217 if (opnum == XTENSA_UNDEFINED)
7223 if (!pcrel_reloc_fits (opcode, opnum, self_offset, target_offset))
7232 free_xlate_map (xmap);
7239 check_section_ebb_reduces (const ebb_constraint *constraint)
7244 for (i = 0; i < constraint->action_count; i++)
7246 const proposed_action *action = &constraint->actions[i];
7247 if (action->do_action)
7248 removed += action->removed_bytes;
7258 text_action_add_proposed (text_action_list *l,
7259 const ebb_constraint *ebb_table,
7264 for (i = 0; i < ebb_table->action_count; i++)
7266 proposed_action *action = &ebb_table->actions[i];
7268 if (!action->do_action)
7270 switch (action->action)
7272 case ta_remove_insn:
7273 case ta_remove_longcall:
7274 case ta_convert_longcall:
7275 case ta_narrow_insn:
7278 case ta_remove_literal:
7279 text_action_add (l, action->action, sec, action->offset,
7280 action->removed_bytes);
7293 compute_fill_extra_space (property_table_entry *entry)
7295 int fill_extra_space;
7300 if ((entry->flags & XTENSA_PROP_UNREACHABLE) == 0)
7303 fill_extra_space = entry->size;
7304 if ((entry->flags & XTENSA_PROP_ALIGN) != 0)
7306 /* Fill bytes for alignment:
7307 (2**n)-1 - (addr + (2**n)-1) & (2**n -1) */
7308 int pow = GET_XTENSA_PROP_ALIGNMENT (entry->flags);
7309 int nsm = (1 << pow) - 1;
7310 bfd_vma addr = entry->address + entry->size;
7311 bfd_vma align_fill = nsm - ((addr + nsm) & nsm);
7312 fill_extra_space += align_fill;
7314 return fill_extra_space;
7318 /* First relaxation pass. */
7320 /* If the section contains relaxable literals, check each literal to
7321 see if it has the same value as another literal that has already
7322 been seen, either in the current section or a previous one. If so,
7323 add an entry to the per-section list of removed literals. The
7324 actual changes are deferred until the next pass. */
7327 compute_removed_literals (bfd *abfd,
7329 struct bfd_link_info *link_info,
7330 value_map_hash_table *values)
7332 xtensa_relax_info *relax_info;
7334 Elf_Internal_Rela *internal_relocs;
7335 source_reloc *src_relocs, *rel;
7336 bfd_boolean ok = TRUE;
7337 property_table_entry *prop_table = NULL;
7340 bfd_boolean last_loc_is_prev = FALSE;
7341 bfd_vma last_target_offset = 0;
7342 section_cache_t target_sec_cache;
7343 bfd_size_type sec_size;
7345 init_section_cache (&target_sec_cache);
7347 /* Do nothing if it is not a relaxable literal section. */
7348 relax_info = get_xtensa_relax_info (sec);
7349 BFD_ASSERT (relax_info);
7350 if (!relax_info->is_relaxable_literal_section)
7353 internal_relocs = retrieve_internal_relocs (abfd, sec,
7354 link_info->keep_memory);
7356 sec_size = bfd_get_section_limit (abfd, sec);
7357 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
7358 if (contents == NULL && sec_size != 0)
7364 /* Sort the source_relocs by target offset. */
7365 src_relocs = relax_info->src_relocs;
7366 qsort (src_relocs, relax_info->src_count,
7367 sizeof (source_reloc), source_reloc_compare);
7368 qsort (internal_relocs, sec->reloc_count, sizeof (Elf_Internal_Rela),
7369 internal_reloc_compare);
7371 ptblsize = xtensa_read_table_entries (abfd, sec, &prop_table,
7372 XTENSA_PROP_SEC_NAME, FALSE);
7380 for (i = 0; i < relax_info->src_count; i++)
7382 Elf_Internal_Rela *irel = NULL;
7384 rel = &src_relocs[i];
7385 if (get_l32r_opcode () != rel->opcode)
7387 irel = get_irel_at_offset (sec, internal_relocs,
7388 rel->r_rel.target_offset);
7390 /* If the relocation on this is not a simple R_XTENSA_32 or
7391 R_XTENSA_PLT then do not consider it. This may happen when
7392 the difference of two symbols is used in a literal. */
7393 if (irel && (ELF32_R_TYPE (irel->r_info) != R_XTENSA_32
7394 && ELF32_R_TYPE (irel->r_info) != R_XTENSA_PLT))
7397 /* If the target_offset for this relocation is the same as the
7398 previous relocation, then we've already considered whether the
7399 literal can be coalesced. Skip to the next one.... */
7400 if (i != 0 && prev_i != -1
7401 && src_relocs[i-1].r_rel.target_offset == rel->r_rel.target_offset)
7405 if (last_loc_is_prev &&
7406 last_target_offset + 4 != rel->r_rel.target_offset)
7407 last_loc_is_prev = FALSE;
7409 /* Check if the relocation was from an L32R that is being removed
7410 because a CALLX was converted to a direct CALL, and check if
7411 there are no other relocations to the literal. */
7412 if (is_removable_literal (rel, i, src_relocs, relax_info->src_count,
7413 sec, prop_table, ptblsize))
7415 if (!remove_dead_literal (abfd, sec, link_info, internal_relocs,
7416 irel, rel, prop_table, ptblsize))
7421 last_target_offset = rel->r_rel.target_offset;
7425 if (!identify_literal_placement (abfd, sec, contents, link_info,
7427 &last_loc_is_prev, irel,
7428 relax_info->src_count - i, rel,
7429 prop_table, ptblsize,
7430 &target_sec_cache, rel->is_abs_literal))
7435 last_target_offset = rel->r_rel.target_offset;
7439 print_removed_literals (stderr, &relax_info->removed_list);
7440 print_action_list (stderr, &relax_info->action_list);
7444 if (prop_table) free (prop_table);
7445 clear_section_cache (&target_sec_cache);
7447 release_contents (sec, contents);
7448 release_internal_relocs (sec, internal_relocs);
7453 static Elf_Internal_Rela *
7454 get_irel_at_offset (asection *sec,
7455 Elf_Internal_Rela *internal_relocs,
7459 Elf_Internal_Rela *irel;
7461 Elf_Internal_Rela key;
7463 if (!internal_relocs)
7466 key.r_offset = offset;
7467 irel = bsearch (&key, internal_relocs, sec->reloc_count,
7468 sizeof (Elf_Internal_Rela), internal_reloc_matches);
7472 /* bsearch does not guarantee which will be returned if there are
7473 multiple matches. We need the first that is not an alignment. */
7474 i = irel - internal_relocs;
7477 if (internal_relocs[i-1].r_offset != offset)
7481 for ( ; i < sec->reloc_count; i++)
7483 irel = &internal_relocs[i];
7484 r_type = ELF32_R_TYPE (irel->r_info);
7485 if (irel->r_offset == offset && r_type != R_XTENSA_NONE)
7494 is_removable_literal (const source_reloc *rel,
7496 const source_reloc *src_relocs,
7499 property_table_entry *prop_table,
7502 const source_reloc *curr_rel;
7503 property_table_entry *entry;
7508 entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
7509 sec->vma + rel->r_rel.target_offset);
7510 if (entry && (entry->flags & XTENSA_PROP_NO_TRANSFORM))
7513 for (++i; i < src_count; ++i)
7515 curr_rel = &src_relocs[i];
7516 /* If all others have the same target offset.... */
7517 if (curr_rel->r_rel.target_offset != rel->r_rel.target_offset)
7520 if (!curr_rel->is_null
7521 && !xtensa_is_property_section (curr_rel->source_sec)
7522 && !(curr_rel->source_sec->flags & SEC_DEBUGGING))
7530 remove_dead_literal (bfd *abfd,
7532 struct bfd_link_info *link_info,
7533 Elf_Internal_Rela *internal_relocs,
7534 Elf_Internal_Rela *irel,
7536 property_table_entry *prop_table,
7539 property_table_entry *entry;
7540 xtensa_relax_info *relax_info;
7542 relax_info = get_xtensa_relax_info (sec);
7546 entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
7547 sec->vma + rel->r_rel.target_offset);
7549 /* Mark the unused literal so that it will be removed. */
7550 add_removed_literal (&relax_info->removed_list, &rel->r_rel, NULL);
7552 text_action_add (&relax_info->action_list,
7553 ta_remove_literal, sec, rel->r_rel.target_offset, 4);
7555 /* If the section is 4-byte aligned, do not add fill. */
7556 if (sec->alignment_power > 2)
7558 int fill_extra_space;
7559 bfd_vma entry_sec_offset;
7561 property_table_entry *the_add_entry;
7565 entry_sec_offset = entry->address - sec->vma + entry->size;
7567 entry_sec_offset = rel->r_rel.target_offset + 4;
7569 /* If the literal range is at the end of the section,
7571 the_add_entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
7573 fill_extra_space = compute_fill_extra_space (the_add_entry);
7575 fa = find_fill_action (&relax_info->action_list, sec, entry_sec_offset);
7576 removed_diff = compute_removed_action_diff (fa, sec, entry_sec_offset,
7577 -4, fill_extra_space);
7579 adjust_fill_action (fa, removed_diff);
7581 text_action_add (&relax_info->action_list,
7582 ta_fill, sec, entry_sec_offset, removed_diff);
7585 /* Zero out the relocation on this literal location. */
7588 if (elf_hash_table (link_info)->dynamic_sections_created)
7589 shrink_dynamic_reloc_sections (link_info, abfd, sec, irel);
7591 irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
7592 pin_internal_relocs (sec, internal_relocs);
7595 /* Do not modify "last_loc_is_prev". */
7601 identify_literal_placement (bfd *abfd,
7604 struct bfd_link_info *link_info,
7605 value_map_hash_table *values,
7606 bfd_boolean *last_loc_is_prev_p,
7607 Elf_Internal_Rela *irel,
7608 int remaining_src_rels,
7610 property_table_entry *prop_table,
7612 section_cache_t *target_sec_cache,
7613 bfd_boolean is_abs_literal)
7617 xtensa_relax_info *relax_info;
7618 bfd_boolean literal_placed = FALSE;
7620 unsigned long value;
7621 bfd_boolean final_static_link;
7622 bfd_size_type sec_size;
7624 relax_info = get_xtensa_relax_info (sec);
7628 sec_size = bfd_get_section_limit (abfd, sec);
7631 (!link_info->relocatable
7632 && !elf_hash_table (link_info)->dynamic_sections_created);
7634 /* The placement algorithm first checks to see if the literal is
7635 already in the value map. If so and the value map is reachable
7636 from all uses, then the literal is moved to that location. If
7637 not, then we identify the last location where a fresh literal was
7638 placed. If the literal can be safely moved there, then we do so.
7639 If not, then we assume that the literal is not to move and leave
7640 the literal where it is, marking it as the last literal
7643 /* Find the literal value. */
7645 r_reloc_init (&r_rel, abfd, irel, contents, sec_size);
7648 BFD_ASSERT (rel->r_rel.target_offset < sec_size);
7649 value = bfd_get_32 (abfd, contents + rel->r_rel.target_offset);
7651 init_literal_value (&val, &r_rel, value, is_abs_literal);
7653 /* Check if we've seen another literal with the same value that
7654 is in the same output section. */
7655 val_map = value_map_get_cached_value (values, &val, final_static_link);
7658 && (r_reloc_get_section (&val_map->loc)->output_section
7659 == sec->output_section)
7660 && relocations_reach (rel, remaining_src_rels, &val_map->loc)
7661 && coalesce_shared_literal (sec, rel, prop_table, ptblsize, val_map))
7663 /* No change to last_loc_is_prev. */
7664 literal_placed = TRUE;
7667 /* For relocatable links, do not try to move literals. To do it
7668 correctly might increase the number of relocations in an input
7669 section making the default relocatable linking fail. */
7670 if (!link_info->relocatable && !literal_placed
7671 && values->has_last_loc && !(*last_loc_is_prev_p))
7673 asection *target_sec = r_reloc_get_section (&values->last_loc);
7674 if (target_sec && target_sec->output_section == sec->output_section)
7676 /* Increment the virtual offset. */
7677 r_reloc try_loc = values->last_loc;
7678 try_loc.virtual_offset += 4;
7680 /* There is a last loc that was in the same output section. */
7681 if (relocations_reach (rel, remaining_src_rels, &try_loc)
7682 && move_shared_literal (sec, link_info, rel,
7683 prop_table, ptblsize,
7684 &try_loc, &val, target_sec_cache))
7686 values->last_loc.virtual_offset += 4;
7687 literal_placed = TRUE;
7689 val_map = add_value_map (values, &val, &try_loc,
7692 val_map->loc = try_loc;
7697 if (!literal_placed)
7699 /* Nothing worked, leave the literal alone but update the last loc. */
7700 values->has_last_loc = TRUE;
7701 values->last_loc = rel->r_rel;
7703 val_map = add_value_map (values, &val, &rel->r_rel, final_static_link);
7705 val_map->loc = rel->r_rel;
7706 *last_loc_is_prev_p = TRUE;
7713 /* Check if the original relocations (presumably on L32R instructions)
7714 identified by reloc[0..N] can be changed to reference the literal
7715 identified by r_rel. If r_rel is out of range for any of the
7716 original relocations, then we don't want to coalesce the original
7717 literal with the one at r_rel. We only check reloc[0..N], where the
7718 offsets are all the same as for reloc[0] (i.e., they're all
7719 referencing the same literal) and where N is also bounded by the
7720 number of remaining entries in the "reloc" array. The "reloc" array
7721 is sorted by target offset so we know all the entries for the same
7722 literal will be contiguous. */
7725 relocations_reach (source_reloc *reloc,
7726 int remaining_relocs,
7727 const r_reloc *r_rel)
7729 bfd_vma from_offset, source_address, dest_address;
7733 if (!r_reloc_is_defined (r_rel))
7736 sec = r_reloc_get_section (r_rel);
7737 from_offset = reloc[0].r_rel.target_offset;
7739 for (i = 0; i < remaining_relocs; i++)
7741 if (reloc[i].r_rel.target_offset != from_offset)
7744 /* Ignore relocations that have been removed. */
7745 if (reloc[i].is_null)
7748 /* The original and new output section for these must be the same
7749 in order to coalesce. */
7750 if (r_reloc_get_section (&reloc[i].r_rel)->output_section
7751 != sec->output_section)
7754 /* Absolute literals in the same output section can always be
7756 if (reloc[i].is_abs_literal)
7759 /* A literal with no PC-relative relocations can be moved anywhere. */
7760 if (reloc[i].opnd != -1)
7762 /* Otherwise, check to see that it fits. */
7763 source_address = (reloc[i].source_sec->output_section->vma
7764 + reloc[i].source_sec->output_offset
7765 + reloc[i].r_rel.rela.r_offset);
7766 dest_address = (sec->output_section->vma
7767 + sec->output_offset
7768 + r_rel->target_offset);
7770 if (!pcrel_reloc_fits (reloc[i].opcode, reloc[i].opnd,
7771 source_address, dest_address))
7780 /* Move a literal to another literal location because it is
7781 the same as the other literal value. */
7784 coalesce_shared_literal (asection *sec,
7786 property_table_entry *prop_table,
7790 property_table_entry *entry;
7792 property_table_entry *the_add_entry;
7794 xtensa_relax_info *relax_info;
7796 relax_info = get_xtensa_relax_info (sec);
7800 entry = elf_xtensa_find_property_entry
7801 (prop_table, ptblsize, sec->vma + rel->r_rel.target_offset);
7802 if (entry && (entry->flags & XTENSA_PROP_NO_TRANSFORM))
7805 /* Mark that the literal will be coalesced. */
7806 add_removed_literal (&relax_info->removed_list, &rel->r_rel, &val_map->loc);
7808 text_action_add (&relax_info->action_list,
7809 ta_remove_literal, sec, rel->r_rel.target_offset, 4);
7811 /* If the section is 4-byte aligned, do not add fill. */
7812 if (sec->alignment_power > 2)
7814 int fill_extra_space;
7815 bfd_vma entry_sec_offset;
7818 entry_sec_offset = entry->address - sec->vma + entry->size;
7820 entry_sec_offset = rel->r_rel.target_offset + 4;
7822 /* If the literal range is at the end of the section,
7824 fill_extra_space = 0;
7825 the_add_entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
7827 if (the_add_entry && (the_add_entry->flags & XTENSA_PROP_UNREACHABLE))
7828 fill_extra_space = the_add_entry->size;
7830 fa = find_fill_action (&relax_info->action_list, sec, entry_sec_offset);
7831 removed_diff = compute_removed_action_diff (fa, sec, entry_sec_offset,
7832 -4, fill_extra_space);
7834 adjust_fill_action (fa, removed_diff);
7836 text_action_add (&relax_info->action_list,
7837 ta_fill, sec, entry_sec_offset, removed_diff);
7844 /* Move a literal to another location. This may actually increase the
7845 total amount of space used because of alignments so we need to do
7846 this carefully. Also, it may make a branch go out of range. */
7849 move_shared_literal (asection *sec,
7850 struct bfd_link_info *link_info,
7852 property_table_entry *prop_table,
7854 const r_reloc *target_loc,
7855 const literal_value *lit_value,
7856 section_cache_t *target_sec_cache)
7858 property_table_entry *the_add_entry, *src_entry, *target_entry = NULL;
7859 text_action *fa, *target_fa;
7861 xtensa_relax_info *relax_info, *target_relax_info;
7862 asection *target_sec;
7864 ebb_constraint ebb_table;
7865 bfd_boolean relocs_fit;
7867 /* If this routine always returns FALSE, the literals that cannot be
7868 coalesced will not be moved. */
7869 if (elf32xtensa_no_literal_movement)
7872 relax_info = get_xtensa_relax_info (sec);
7876 target_sec = r_reloc_get_section (target_loc);
7877 target_relax_info = get_xtensa_relax_info (target_sec);
7879 /* Literals to undefined sections may not be moved because they
7880 must report an error. */
7881 if (bfd_is_und_section (target_sec))
7884 src_entry = elf_xtensa_find_property_entry
7885 (prop_table, ptblsize, sec->vma + rel->r_rel.target_offset);
7887 if (!section_cache_section (target_sec_cache, target_sec, link_info))
7890 target_entry = elf_xtensa_find_property_entry
7891 (target_sec_cache->ptbl, target_sec_cache->pte_count,
7892 target_sec->vma + target_loc->target_offset);
7897 /* Make sure that we have not broken any branches. */
7900 init_ebb_constraint (&ebb_table);
7901 ebb = &ebb_table.ebb;
7902 init_ebb (ebb, target_sec_cache->sec, target_sec_cache->contents,
7903 target_sec_cache->content_length,
7904 target_sec_cache->ptbl, target_sec_cache->pte_count,
7905 target_sec_cache->relocs, target_sec_cache->reloc_count);
7907 /* Propose to add 4 bytes + worst-case alignment size increase to
7909 ebb_propose_action (&ebb_table, EBB_NO_ALIGN, 0,
7910 ta_fill, target_loc->target_offset,
7911 -4 - (1 << target_sec->alignment_power), TRUE);
7913 /* Check all of the PC-relative relocations to make sure they still fit. */
7914 relocs_fit = check_section_ebb_pcrels_fit (target_sec->owner, target_sec,
7915 target_sec_cache->contents,
7916 target_sec_cache->relocs,
7922 text_action_add_literal (&target_relax_info->action_list,
7923 ta_add_literal, target_loc, lit_value, -4);
7925 if (target_sec->alignment_power > 2 && target_entry != src_entry)
7927 /* May need to add or remove some fill to maintain alignment. */
7928 int fill_extra_space;
7929 bfd_vma entry_sec_offset;
7932 target_entry->address - target_sec->vma + target_entry->size;
7934 /* If the literal range is at the end of the section,
7936 fill_extra_space = 0;
7938 elf_xtensa_find_property_entry (target_sec_cache->ptbl,
7939 target_sec_cache->pte_count,
7941 if (the_add_entry && (the_add_entry->flags & XTENSA_PROP_UNREACHABLE))
7942 fill_extra_space = the_add_entry->size;
7944 target_fa = find_fill_action (&target_relax_info->action_list,
7945 target_sec, entry_sec_offset);
7946 removed_diff = compute_removed_action_diff (target_fa, target_sec,
7947 entry_sec_offset, 4,
7950 adjust_fill_action (target_fa, removed_diff);
7952 text_action_add (&target_relax_info->action_list,
7953 ta_fill, target_sec, entry_sec_offset, removed_diff);
7956 /* Mark that the literal will be moved to the new location. */
7957 add_removed_literal (&relax_info->removed_list, &rel->r_rel, target_loc);
7959 /* Remove the literal. */
7960 text_action_add (&relax_info->action_list,
7961 ta_remove_literal, sec, rel->r_rel.target_offset, 4);
7963 /* If the section is 4-byte aligned, do not add fill. */
7964 if (sec->alignment_power > 2 && target_entry != src_entry)
7966 int fill_extra_space;
7967 bfd_vma entry_sec_offset;
7970 entry_sec_offset = src_entry->address - sec->vma + src_entry->size;
7972 entry_sec_offset = rel->r_rel.target_offset+4;
7974 /* If the literal range is at the end of the section,
7976 fill_extra_space = 0;
7977 the_add_entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
7979 if (the_add_entry && (the_add_entry->flags & XTENSA_PROP_UNREACHABLE))
7980 fill_extra_space = the_add_entry->size;
7982 fa = find_fill_action (&relax_info->action_list, sec, entry_sec_offset);
7983 removed_diff = compute_removed_action_diff (fa, sec, entry_sec_offset,
7984 -4, fill_extra_space);
7986 adjust_fill_action (fa, removed_diff);
7988 text_action_add (&relax_info->action_list,
7989 ta_fill, sec, entry_sec_offset, removed_diff);
7996 /* Second relaxation pass. */
7998 /* Modify all of the relocations to point to the right spot, and if this
7999 is a relaxable section, delete the unwanted literals and fix the
8003 relax_section (bfd *abfd, asection *sec, struct bfd_link_info *link_info)
8005 Elf_Internal_Rela *internal_relocs;
8006 xtensa_relax_info *relax_info;
8008 bfd_boolean ok = TRUE;
8010 bfd_boolean rv = FALSE;
8011 bfd_boolean virtual_action;
8012 bfd_size_type sec_size;
8014 sec_size = bfd_get_section_limit (abfd, sec);
8015 relax_info = get_xtensa_relax_info (sec);
8016 BFD_ASSERT (relax_info);
8018 /* First translate any of the fixes that have been added already. */
8019 translate_section_fixes (sec);
8021 /* Handle property sections (e.g., literal tables) specially. */
8022 if (xtensa_is_property_section (sec))
8024 BFD_ASSERT (!relax_info->is_relaxable_literal_section);
8025 return relax_property_section (abfd, sec, link_info);
8028 internal_relocs = retrieve_internal_relocs (abfd, sec,
8029 link_info->keep_memory);
8030 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
8031 if (contents == NULL && sec_size != 0)
8037 if (internal_relocs)
8039 for (i = 0; i < sec->reloc_count; i++)
8041 Elf_Internal_Rela *irel;
8042 xtensa_relax_info *target_relax_info;
8043 bfd_vma source_offset, old_source_offset;
8046 asection *target_sec;
8048 /* Locally change the source address.
8049 Translate the target to the new target address.
8050 If it points to this section and has been removed,
8054 irel = &internal_relocs[i];
8055 source_offset = irel->r_offset;
8056 old_source_offset = source_offset;
8058 r_type = ELF32_R_TYPE (irel->r_info);
8059 r_reloc_init (&r_rel, abfd, irel, contents,
8060 bfd_get_section_limit (abfd, sec));
8062 /* If this section could have changed then we may need to
8063 change the relocation's offset. */
8065 if (relax_info->is_relaxable_literal_section
8066 || relax_info->is_relaxable_asm_section)
8068 pin_internal_relocs (sec, internal_relocs);
8070 if (r_type != R_XTENSA_NONE
8071 && find_removed_literal (&relax_info->removed_list,
8074 /* Remove this relocation. */
8075 if (elf_hash_table (link_info)->dynamic_sections_created)
8076 shrink_dynamic_reloc_sections (link_info, abfd, sec, irel);
8077 irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
8078 irel->r_offset = offset_with_removed_text
8079 (&relax_info->action_list, irel->r_offset);
8083 if (r_type == R_XTENSA_ASM_SIMPLIFY)
8085 text_action *action =
8086 find_insn_action (&relax_info->action_list,
8088 if (action && (action->action == ta_convert_longcall
8089 || action->action == ta_remove_longcall))
8091 bfd_reloc_status_type retval;
8092 char *error_message = NULL;
8094 retval = contract_asm_expansion (contents, sec_size,
8095 irel, &error_message);
8096 if (retval != bfd_reloc_ok)
8098 (*link_info->callbacks->reloc_dangerous)
8099 (link_info, error_message, abfd, sec,
8103 /* Update the action so that the code that moves
8104 the contents will do the right thing. */
8105 if (action->action == ta_remove_longcall)
8106 action->action = ta_remove_insn;
8108 action->action = ta_none;
8109 /* Refresh the info in the r_rel. */
8110 r_reloc_init (&r_rel, abfd, irel, contents, sec_size);
8111 r_type = ELF32_R_TYPE (irel->r_info);
8115 source_offset = offset_with_removed_text
8116 (&relax_info->action_list, irel->r_offset);
8117 irel->r_offset = source_offset;
8120 /* If the target section could have changed then
8121 we may need to change the relocation's target offset. */
8123 target_sec = r_reloc_get_section (&r_rel);
8125 /* For a reference to a discarded section from a DWARF section,
8126 i.e., where action_discarded is PRETEND, the symbol will
8127 eventually be modified to refer to the kept section (at least if
8128 the kept and discarded sections are the same size). Anticipate
8129 that here and adjust things accordingly. */
8130 if (! elf_xtensa_ignore_discarded_relocs (sec)
8131 && elf_xtensa_action_discarded (sec) == PRETEND
8132 && sec->sec_info_type != ELF_INFO_TYPE_STABS
8133 && target_sec != NULL
8134 && elf_discarded_section (target_sec))
8136 /* It would be natural to call _bfd_elf_check_kept_section
8137 here, but it's not exported from elflink.c. It's also a
8138 fairly expensive check. Adjusting the relocations to the
8139 discarded section is fairly harmless; it will only adjust
8140 some addends and difference values. If it turns out that
8141 _bfd_elf_check_kept_section fails later, it won't matter,
8142 so just compare the section names to find the right group
8144 asection *kept = target_sec->kept_section;
8147 if ((kept->flags & SEC_GROUP) != 0)
8149 asection *first = elf_next_in_group (kept);
8150 asection *s = first;
8155 if (strcmp (s->name, target_sec->name) == 0)
8160 s = elf_next_in_group (s);
8167 && ((target_sec->rawsize != 0
8168 ? target_sec->rawsize : target_sec->size)
8169 == (kept->rawsize != 0 ? kept->rawsize : kept->size)))
8173 target_relax_info = get_xtensa_relax_info (target_sec);
8174 if (target_relax_info
8175 && (target_relax_info->is_relaxable_literal_section
8176 || target_relax_info->is_relaxable_asm_section))
8179 target_sec = translate_reloc (&r_rel, &new_reloc, target_sec);
8181 if (r_type == R_XTENSA_DIFF8
8182 || r_type == R_XTENSA_DIFF16
8183 || r_type == R_XTENSA_DIFF32)
8185 bfd_vma diff_value = 0, new_end_offset, diff_mask = 0;
8187 if (bfd_get_section_limit (abfd, sec) < old_source_offset)
8189 (*link_info->callbacks->reloc_dangerous)
8190 (link_info, _("invalid relocation address"),
8191 abfd, sec, old_source_offset);
8197 case R_XTENSA_DIFF8:
8199 bfd_get_8 (abfd, &contents[old_source_offset]);
8201 case R_XTENSA_DIFF16:
8203 bfd_get_16 (abfd, &contents[old_source_offset]);
8205 case R_XTENSA_DIFF32:
8207 bfd_get_32 (abfd, &contents[old_source_offset]);
8211 new_end_offset = offset_with_removed_text
8212 (&target_relax_info->action_list,
8213 r_rel.target_offset + diff_value);
8214 diff_value = new_end_offset - new_reloc.target_offset;
8218 case R_XTENSA_DIFF8:
8220 bfd_put_8 (abfd, diff_value,
8221 &contents[old_source_offset]);
8223 case R_XTENSA_DIFF16:
8225 bfd_put_16 (abfd, diff_value,
8226 &contents[old_source_offset]);
8228 case R_XTENSA_DIFF32:
8229 diff_mask = 0xffffffff;
8230 bfd_put_32 (abfd, diff_value,
8231 &contents[old_source_offset]);
8235 /* Check for overflow. */
8236 if ((diff_value & ~diff_mask) != 0)
8238 (*link_info->callbacks->reloc_dangerous)
8239 (link_info, _("overflow after relaxation"),
8240 abfd, sec, old_source_offset);
8244 pin_contents (sec, contents);
8247 /* If the relocation still references a section in the same
8248 input file, modify the relocation directly instead of
8249 adding a "fix" record. */
8250 if (target_sec->owner == abfd)
8252 unsigned r_symndx = ELF32_R_SYM (new_reloc.rela.r_info);
8253 irel->r_info = ELF32_R_INFO (r_symndx, r_type);
8254 irel->r_addend = new_reloc.rela.r_addend;
8255 pin_internal_relocs (sec, internal_relocs);
8259 bfd_vma addend_displacement;
8262 addend_displacement =
8263 new_reloc.target_offset + new_reloc.virtual_offset;
8264 fix = reloc_bfd_fix_init (sec, source_offset, r_type,
8266 addend_displacement, TRUE);
8273 if ((relax_info->is_relaxable_literal_section
8274 || relax_info->is_relaxable_asm_section)
8275 && relax_info->action_list.head)
8277 /* Walk through the planned actions and build up a table
8278 of move, copy and fill records. Use the move, copy and
8279 fill records to perform the actions once. */
8282 bfd_size_type final_size, copy_size, orig_insn_size;
8283 bfd_byte *scratch = NULL;
8284 bfd_byte *dup_contents = NULL;
8285 bfd_size_type orig_size = sec->size;
8286 bfd_vma orig_dot = 0;
8287 bfd_vma orig_dot_copied = 0; /* Byte copied already from
8288 orig dot in physical memory. */
8289 bfd_vma orig_dot_vo = 0; /* Virtual offset from orig_dot. */
8290 bfd_vma dup_dot = 0;
8292 text_action *action = relax_info->action_list.head;
8294 final_size = sec->size;
8295 for (action = relax_info->action_list.head; action;
8296 action = action->next)
8298 final_size -= action->removed_bytes;
8301 scratch = (bfd_byte *) bfd_zmalloc (final_size);
8302 dup_contents = (bfd_byte *) bfd_zmalloc (final_size);
8304 /* The dot is the current fill location. */
8306 print_action_list (stderr, &relax_info->action_list);
8309 for (action = relax_info->action_list.head; action;
8310 action = action->next)
8312 virtual_action = FALSE;
8313 if (action->offset > orig_dot)
8315 orig_dot += orig_dot_copied;
8316 orig_dot_copied = 0;
8318 /* Out of the virtual world. */
8321 if (action->offset > orig_dot)
8323 copy_size = action->offset - orig_dot;
8324 memmove (&dup_contents[dup_dot], &contents[orig_dot], copy_size);
8325 orig_dot += copy_size;
8326 dup_dot += copy_size;
8327 BFD_ASSERT (action->offset == orig_dot);
8329 else if (action->offset < orig_dot)
8331 if (action->action == ta_fill
8332 && action->offset - action->removed_bytes == orig_dot)
8334 /* This is OK because the fill only effects the dup_dot. */
8336 else if (action->action == ta_add_literal)
8338 /* TBD. Might need to handle this. */
8341 if (action->offset == orig_dot)
8343 if (action->virtual_offset > orig_dot_vo)
8345 if (orig_dot_vo == 0)
8347 /* Need to copy virtual_offset bytes. Probably four. */
8348 copy_size = action->virtual_offset - orig_dot_vo;
8349 memmove (&dup_contents[dup_dot],
8350 &contents[orig_dot], copy_size);
8351 orig_dot_copied = copy_size;
8352 dup_dot += copy_size;
8354 virtual_action = TRUE;
8357 BFD_ASSERT (action->virtual_offset <= orig_dot_vo);
8359 switch (action->action)
8361 case ta_remove_literal:
8362 case ta_remove_insn:
8363 BFD_ASSERT (action->removed_bytes >= 0);
8364 orig_dot += action->removed_bytes;
8367 case ta_narrow_insn:
8370 memmove (scratch, &contents[orig_dot], orig_insn_size);
8371 BFD_ASSERT (action->removed_bytes == 1);
8372 rv = narrow_instruction (scratch, final_size, 0);
8374 memmove (&dup_contents[dup_dot], scratch, copy_size);
8375 orig_dot += orig_insn_size;
8376 dup_dot += copy_size;
8380 if (action->removed_bytes >= 0)
8381 orig_dot += action->removed_bytes;
8384 /* Already zeroed in dup_contents. Just bump the
8386 dup_dot += (-action->removed_bytes);
8391 BFD_ASSERT (action->removed_bytes == 0);
8394 case ta_convert_longcall:
8395 case ta_remove_longcall:
8396 /* These will be removed or converted before we get here. */
8403 memmove (scratch, &contents[orig_dot], orig_insn_size);
8404 BFD_ASSERT (action->removed_bytes == -1);
8405 rv = widen_instruction (scratch, final_size, 0);
8407 memmove (&dup_contents[dup_dot], scratch, copy_size);
8408 orig_dot += orig_insn_size;
8409 dup_dot += copy_size;
8412 case ta_add_literal:
8415 BFD_ASSERT (action->removed_bytes == -4);
8416 /* TBD -- place the literal value here and insert
8418 memset (&dup_contents[dup_dot], 0, 4);
8419 pin_internal_relocs (sec, internal_relocs);
8420 pin_contents (sec, contents);
8422 if (!move_literal (abfd, link_info, sec, dup_dot, dup_contents,
8423 relax_info, &internal_relocs, &action->value))
8427 orig_dot_vo += copy_size;
8429 orig_dot += orig_insn_size;
8430 dup_dot += copy_size;
8434 /* Not implemented yet. */
8439 removed += action->removed_bytes;
8440 BFD_ASSERT (dup_dot <= final_size);
8441 BFD_ASSERT (orig_dot <= orig_size);
8444 orig_dot += orig_dot_copied;
8445 orig_dot_copied = 0;
8447 if (orig_dot != orig_size)
8449 copy_size = orig_size - orig_dot;
8450 BFD_ASSERT (orig_size > orig_dot);
8451 BFD_ASSERT (dup_dot + copy_size == final_size);
8452 memmove (&dup_contents[dup_dot], &contents[orig_dot], copy_size);
8453 orig_dot += copy_size;
8454 dup_dot += copy_size;
8456 BFD_ASSERT (orig_size == orig_dot);
8457 BFD_ASSERT (final_size == dup_dot);
8459 /* Move the dup_contents back. */
8460 if (final_size > orig_size)
8462 /* Contents need to be reallocated. Swap the dup_contents into
8464 sec->contents = dup_contents;
8466 contents = dup_contents;
8467 pin_contents (sec, contents);
8471 BFD_ASSERT (final_size <= orig_size);
8472 memset (contents, 0, orig_size);
8473 memcpy (contents, dup_contents, final_size);
8474 free (dup_contents);
8477 pin_contents (sec, contents);
8479 if (sec->rawsize == 0)
8480 sec->rawsize = sec->size;
8481 sec->size = final_size;
8485 release_internal_relocs (sec, internal_relocs);
8486 release_contents (sec, contents);
8492 translate_section_fixes (asection *sec)
8494 xtensa_relax_info *relax_info;
8497 relax_info = get_xtensa_relax_info (sec);
8501 for (r = relax_info->fix_list; r != NULL; r = r->next)
8502 if (!translate_reloc_bfd_fix (r))
8509 /* Translate a fix given the mapping in the relax info for the target
8510 section. If it has already been translated, no work is required. */
8513 translate_reloc_bfd_fix (reloc_bfd_fix *fix)
8515 reloc_bfd_fix new_fix;
8517 xtensa_relax_info *relax_info;
8518 removed_literal *removed;
8519 bfd_vma new_offset, target_offset;
8521 if (fix->translated)
8524 sec = fix->target_sec;
8525 target_offset = fix->target_offset;
8527 relax_info = get_xtensa_relax_info (sec);
8530 fix->translated = TRUE;
8536 /* The fix does not need to be translated if the section cannot change. */
8537 if (!relax_info->is_relaxable_literal_section
8538 && !relax_info->is_relaxable_asm_section)
8540 fix->translated = TRUE;
8544 /* If the literal has been moved and this relocation was on an
8545 opcode, then the relocation should move to the new literal
8546 location. Otherwise, the relocation should move within the
8550 if (is_operand_relocation (fix->src_type))
8552 /* Check if the original relocation is against a literal being
8554 removed = find_removed_literal (&relax_info->removed_list,
8562 /* The fact that there is still a relocation to this literal indicates
8563 that the literal is being coalesced, not simply removed. */
8564 BFD_ASSERT (removed->to.abfd != NULL);
8566 /* This was moved to some other address (possibly another section). */
8567 new_sec = r_reloc_get_section (&removed->to);
8571 relax_info = get_xtensa_relax_info (sec);
8573 (!relax_info->is_relaxable_literal_section
8574 && !relax_info->is_relaxable_asm_section))
8576 target_offset = removed->to.target_offset;
8577 new_fix.target_sec = new_sec;
8578 new_fix.target_offset = target_offset;
8579 new_fix.translated = TRUE;
8584 target_offset = removed->to.target_offset;
8585 new_fix.target_sec = new_sec;
8588 /* The target address may have been moved within its section. */
8589 new_offset = offset_with_removed_text (&relax_info->action_list,
8592 new_fix.target_offset = new_offset;
8593 new_fix.target_offset = new_offset;
8594 new_fix.translated = TRUE;
8600 /* Fix up a relocation to take account of removed literals. */
8603 translate_reloc (const r_reloc *orig_rel, r_reloc *new_rel, asection *sec)
8605 xtensa_relax_info *relax_info;
8606 removed_literal *removed;
8607 bfd_vma target_offset, base_offset;
8610 *new_rel = *orig_rel;
8612 if (!r_reloc_is_defined (orig_rel))
8615 relax_info = get_xtensa_relax_info (sec);
8616 BFD_ASSERT (relax_info && (relax_info->is_relaxable_literal_section
8617 || relax_info->is_relaxable_asm_section));
8619 target_offset = orig_rel->target_offset;
8622 if (is_operand_relocation (ELF32_R_TYPE (orig_rel->rela.r_info)))
8624 /* Check if the original relocation is against a literal being
8626 removed = find_removed_literal (&relax_info->removed_list,
8629 if (removed && removed->to.abfd)
8633 /* The fact that there is still a relocation to this literal indicates
8634 that the literal is being coalesced, not simply removed. */
8635 BFD_ASSERT (removed->to.abfd != NULL);
8637 /* This was moved to some other address
8638 (possibly in another section). */
8639 *new_rel = removed->to;
8640 new_sec = r_reloc_get_section (new_rel);
8644 relax_info = get_xtensa_relax_info (sec);
8646 || (!relax_info->is_relaxable_literal_section
8647 && !relax_info->is_relaxable_asm_section))
8650 target_offset = new_rel->target_offset;
8653 /* Find the base offset of the reloc symbol, excluding any addend from the
8654 reloc or from the section contents (for a partial_inplace reloc). Then
8655 find the adjusted values of the offsets due to relaxation. The base
8656 offset is needed to determine the change to the reloc's addend; the reloc
8657 addend should not be adjusted due to relaxations located before the base
8660 base_offset = r_reloc_get_target_offset (new_rel) - new_rel->rela.r_addend;
8661 act = relax_info->action_list.head;
8662 if (base_offset <= target_offset)
8664 int base_removed = removed_by_actions (&act, base_offset, FALSE);
8665 int addend_removed = removed_by_actions (&act, target_offset, FALSE);
8666 new_rel->target_offset = target_offset - base_removed - addend_removed;
8667 new_rel->rela.r_addend -= addend_removed;
8671 /* Handle a negative addend. The base offset comes first. */
8672 int tgt_removed = removed_by_actions (&act, target_offset, FALSE);
8673 int addend_removed = removed_by_actions (&act, base_offset, FALSE);
8674 new_rel->target_offset = target_offset - tgt_removed;
8675 new_rel->rela.r_addend += addend_removed;
8682 /* For dynamic links, there may be a dynamic relocation for each
8683 literal. The number of dynamic relocations must be computed in
8684 size_dynamic_sections, which occurs before relaxation. When a
8685 literal is removed, this function checks if there is a corresponding
8686 dynamic relocation and shrinks the size of the appropriate dynamic
8687 relocation section accordingly. At this point, the contents of the
8688 dynamic relocation sections have not yet been filled in, so there's
8689 nothing else that needs to be done. */
8692 shrink_dynamic_reloc_sections (struct bfd_link_info *info,
8694 asection *input_section,
8695 Elf_Internal_Rela *rel)
8697 struct elf_xtensa_link_hash_table *htab;
8698 Elf_Internal_Shdr *symtab_hdr;
8699 struct elf_link_hash_entry **sym_hashes;
8700 unsigned long r_symndx;
8702 struct elf_link_hash_entry *h;
8703 bfd_boolean dynamic_symbol;
8705 htab = elf_xtensa_hash_table (info);
8706 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
8707 sym_hashes = elf_sym_hashes (abfd);
8709 r_type = ELF32_R_TYPE (rel->r_info);
8710 r_symndx = ELF32_R_SYM (rel->r_info);
8712 if (r_symndx < symtab_hdr->sh_info)
8715 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
8717 dynamic_symbol = elf_xtensa_dynamic_symbol_p (h, info);
8719 if ((r_type == R_XTENSA_32 || r_type == R_XTENSA_PLT)
8720 && (input_section->flags & SEC_ALLOC) != 0
8721 && (dynamic_symbol || info->shared))
8724 bfd_boolean is_plt = FALSE;
8726 if (dynamic_symbol && r_type == R_XTENSA_PLT)
8728 srel = htab->srelplt;
8732 srel = htab->srelgot;
8734 /* Reduce size of the .rela.* section by one reloc. */
8735 BFD_ASSERT (srel != NULL);
8736 BFD_ASSERT (srel->size >= sizeof (Elf32_External_Rela));
8737 srel->size -= sizeof (Elf32_External_Rela);
8741 asection *splt, *sgotplt, *srelgot;
8742 int reloc_index, chunk;
8744 /* Find the PLT reloc index of the entry being removed. This
8745 is computed from the size of ".rela.plt". It is needed to
8746 figure out which PLT chunk to resize. Usually "last index
8747 = size - 1" since the index starts at zero, but in this
8748 context, the size has just been decremented so there's no
8749 need to subtract one. */
8750 reloc_index = srel->size / sizeof (Elf32_External_Rela);
8752 chunk = reloc_index / PLT_ENTRIES_PER_CHUNK;
8753 splt = elf_xtensa_get_plt_section (info, chunk);
8754 sgotplt = elf_xtensa_get_gotplt_section (info, chunk);
8755 BFD_ASSERT (splt != NULL && sgotplt != NULL);
8757 /* Check if an entire PLT chunk has just been eliminated. */
8758 if (reloc_index % PLT_ENTRIES_PER_CHUNK == 0)
8760 /* The two magic GOT entries for that chunk can go away. */
8761 srelgot = htab->srelgot;
8762 BFD_ASSERT (srelgot != NULL);
8763 srelgot->reloc_count -= 2;
8764 srelgot->size -= 2 * sizeof (Elf32_External_Rela);
8767 /* There should be only one entry left (and it will be
8769 BFD_ASSERT (sgotplt->size == 4);
8770 BFD_ASSERT (splt->size == PLT_ENTRY_SIZE);
8773 BFD_ASSERT (sgotplt->size >= 4);
8774 BFD_ASSERT (splt->size >= PLT_ENTRY_SIZE);
8777 splt->size -= PLT_ENTRY_SIZE;
8783 /* Take an r_rel and move it to another section. This usually
8784 requires extending the interal_relocation array and pinning it. If
8785 the original r_rel is from the same BFD, we can complete this here.
8786 Otherwise, we add a fix record to let the final link fix the
8787 appropriate address. Contents and internal relocations for the
8788 section must be pinned after calling this routine. */
8791 move_literal (bfd *abfd,
8792 struct bfd_link_info *link_info,
8796 xtensa_relax_info *relax_info,
8797 Elf_Internal_Rela **internal_relocs_p,
8798 const literal_value *lit)
8800 Elf_Internal_Rela *new_relocs = NULL;
8801 size_t new_relocs_count = 0;
8802 Elf_Internal_Rela this_rela;
8803 const r_reloc *r_rel;
8805 r_rel = &lit->r_rel;
8806 BFD_ASSERT (elf_section_data (sec)->relocs == *internal_relocs_p);
8808 if (r_reloc_is_const (r_rel))
8809 bfd_put_32 (abfd, lit->value, contents + offset);
8814 asection *target_sec;
8818 r_type = ELF32_R_TYPE (r_rel->rela.r_info);
8819 target_sec = r_reloc_get_section (r_rel);
8821 /* This is the difficult case. We have to create a fix up. */
8822 this_rela.r_offset = offset;
8823 this_rela.r_info = ELF32_R_INFO (0, r_type);
8824 this_rela.r_addend =
8825 r_rel->target_offset - r_reloc_get_target_offset (r_rel);
8826 bfd_put_32 (abfd, lit->value, contents + offset);
8828 /* Currently, we cannot move relocations during a relocatable link. */
8829 BFD_ASSERT (!link_info->relocatable);
8830 fix = reloc_bfd_fix_init (sec, offset, r_type,
8831 r_reloc_get_section (r_rel),
8832 r_rel->target_offset + r_rel->virtual_offset,
8834 /* We also need to mark that relocations are needed here. */
8835 sec->flags |= SEC_RELOC;
8837 translate_reloc_bfd_fix (fix);
8838 /* This fix has not yet been translated. */
8841 /* Add the relocation. If we have already allocated our own
8842 space for the relocations and we have room for more, then use
8843 it. Otherwise, allocate new space and move the literals. */
8844 insert_at = sec->reloc_count;
8845 for (i = 0; i < sec->reloc_count; ++i)
8847 if (this_rela.r_offset < (*internal_relocs_p)[i].r_offset)
8854 if (*internal_relocs_p != relax_info->allocated_relocs
8855 || sec->reloc_count + 1 > relax_info->allocated_relocs_count)
8857 BFD_ASSERT (relax_info->allocated_relocs == NULL
8858 || sec->reloc_count == relax_info->relocs_count);
8860 if (relax_info->allocated_relocs_count == 0)
8861 new_relocs_count = (sec->reloc_count + 2) * 2;
8863 new_relocs_count = (relax_info->allocated_relocs_count + 2) * 2;
8865 new_relocs = (Elf_Internal_Rela *)
8866 bfd_zmalloc (sizeof (Elf_Internal_Rela) * (new_relocs_count));
8870 /* We could handle this more quickly by finding the split point. */
8872 memcpy (new_relocs, *internal_relocs_p,
8873 insert_at * sizeof (Elf_Internal_Rela));
8875 new_relocs[insert_at] = this_rela;
8877 if (insert_at != sec->reloc_count)
8878 memcpy (new_relocs + insert_at + 1,
8879 (*internal_relocs_p) + insert_at,
8880 (sec->reloc_count - insert_at)
8881 * sizeof (Elf_Internal_Rela));
8883 if (*internal_relocs_p != relax_info->allocated_relocs)
8885 /* The first time we re-allocate, we can only free the
8886 old relocs if they were allocated with bfd_malloc.
8887 This is not true when keep_memory is in effect. */
8888 if (!link_info->keep_memory)
8889 free (*internal_relocs_p);
8892 free (*internal_relocs_p);
8893 relax_info->allocated_relocs = new_relocs;
8894 relax_info->allocated_relocs_count = new_relocs_count;
8895 elf_section_data (sec)->relocs = new_relocs;
8897 relax_info->relocs_count = sec->reloc_count;
8898 *internal_relocs_p = new_relocs;
8902 if (insert_at != sec->reloc_count)
8905 for (idx = sec->reloc_count; idx > insert_at; idx--)
8906 (*internal_relocs_p)[idx] = (*internal_relocs_p)[idx-1];
8908 (*internal_relocs_p)[insert_at] = this_rela;
8910 if (relax_info->allocated_relocs)
8911 relax_info->relocs_count = sec->reloc_count;
8918 /* This is similar to relax_section except that when a target is moved,
8919 we shift addresses up. We also need to modify the size. This
8920 algorithm does NOT allow for relocations into the middle of the
8921 property sections. */
8924 relax_property_section (bfd *abfd,
8926 struct bfd_link_info *link_info)
8928 Elf_Internal_Rela *internal_relocs;
8931 bfd_boolean ok = TRUE;
8932 bfd_boolean is_full_prop_section;
8933 size_t last_zfill_target_offset = 0;
8934 asection *last_zfill_target_sec = NULL;
8935 bfd_size_type sec_size;
8936 bfd_size_type entry_size;
8938 sec_size = bfd_get_section_limit (abfd, sec);
8939 internal_relocs = retrieve_internal_relocs (abfd, sec,
8940 link_info->keep_memory);
8941 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
8942 if (contents == NULL && sec_size != 0)
8948 is_full_prop_section = xtensa_is_proptable_section (sec);
8949 if (is_full_prop_section)
8954 if (internal_relocs)
8956 for (i = 0; i < sec->reloc_count; i++)
8958 Elf_Internal_Rela *irel;
8959 xtensa_relax_info *target_relax_info;
8961 asection *target_sec;
8963 bfd_byte *size_p, *flags_p;
8965 /* Locally change the source address.
8966 Translate the target to the new target address.
8967 If it points to this section and has been removed, MOVE IT.
8968 Also, don't forget to modify the associated SIZE at
8971 irel = &internal_relocs[i];
8972 r_type = ELF32_R_TYPE (irel->r_info);
8973 if (r_type == R_XTENSA_NONE)
8976 /* Find the literal value. */
8977 r_reloc_init (&val.r_rel, abfd, irel, contents, sec_size);
8978 size_p = &contents[irel->r_offset + 4];
8980 if (is_full_prop_section)
8981 flags_p = &contents[irel->r_offset + 8];
8982 BFD_ASSERT (irel->r_offset + entry_size <= sec_size);
8984 target_sec = r_reloc_get_section (&val.r_rel);
8985 target_relax_info = get_xtensa_relax_info (target_sec);
8987 if (target_relax_info
8988 && (target_relax_info->is_relaxable_literal_section
8989 || target_relax_info->is_relaxable_asm_section ))
8991 /* Translate the relocation's destination. */
8992 bfd_vma old_offset = val.r_rel.target_offset;
8994 long old_size, new_size;
8995 text_action *act = target_relax_info->action_list.head;
8996 new_offset = old_offset -
8997 removed_by_actions (&act, old_offset, FALSE);
8999 /* Assert that we are not out of bounds. */
9000 old_size = bfd_get_32 (abfd, size_p);
9001 new_size = old_size;
9005 /* Only the first zero-sized unreachable entry is
9006 allowed to expand. In this case the new offset
9007 should be the offset before the fill and the new
9008 size is the expansion size. For other zero-sized
9009 entries the resulting size should be zero with an
9010 offset before or after the fill address depending
9011 on whether the expanding unreachable entry
9013 if (last_zfill_target_sec == 0
9014 || last_zfill_target_sec != target_sec
9015 || last_zfill_target_offset != old_offset)
9017 bfd_vma new_end_offset = new_offset;
9019 /* Recompute the new_offset, but this time don't
9020 include any fill inserted by relaxation. */
9021 act = target_relax_info->action_list.head;
9022 new_offset = old_offset -
9023 removed_by_actions (&act, old_offset, TRUE);
9025 /* If it is not unreachable and we have not yet
9026 seen an unreachable at this address, place it
9027 before the fill address. */
9028 if (flags_p && (bfd_get_32 (abfd, flags_p)
9029 & XTENSA_PROP_UNREACHABLE) != 0)
9031 new_size = new_end_offset - new_offset;
9033 last_zfill_target_sec = target_sec;
9034 last_zfill_target_offset = old_offset;
9040 removed_by_actions (&act, old_offset + old_size, TRUE);
9042 if (new_size != old_size)
9044 bfd_put_32 (abfd, new_size, size_p);
9045 pin_contents (sec, contents);
9048 if (new_offset != old_offset)
9050 bfd_vma diff = new_offset - old_offset;
9051 irel->r_addend += diff;
9052 pin_internal_relocs (sec, internal_relocs);
9058 /* Combine adjacent property table entries. This is also done in
9059 finish_dynamic_sections() but at that point it's too late to
9060 reclaim the space in the output section, so we do this twice. */
9062 if (internal_relocs && (!link_info->relocatable
9063 || xtensa_is_littable_section (sec)))
9065 Elf_Internal_Rela *last_irel = NULL;
9066 Elf_Internal_Rela *irel, *next_rel, *rel_end;
9067 int removed_bytes = 0;
9069 flagword predef_flags;
9071 predef_flags = xtensa_get_property_predef_flags (sec);
9073 /* Walk over memory and relocations at the same time.
9074 This REQUIRES that the internal_relocs be sorted by offset. */
9075 qsort (internal_relocs, sec->reloc_count, sizeof (Elf_Internal_Rela),
9076 internal_reloc_compare);
9078 pin_internal_relocs (sec, internal_relocs);
9079 pin_contents (sec, contents);
9081 next_rel = internal_relocs;
9082 rel_end = internal_relocs + sec->reloc_count;
9084 BFD_ASSERT (sec->size % entry_size == 0);
9086 for (offset = 0; offset < sec->size; offset += entry_size)
9088 Elf_Internal_Rela *offset_rel, *extra_rel;
9089 bfd_vma bytes_to_remove, size, actual_offset;
9090 bfd_boolean remove_this_rel;
9093 /* Find the first relocation for the entry at the current offset.
9094 Adjust the offsets of any extra relocations for the previous
9099 for (irel = next_rel; irel < rel_end; irel++)
9101 if ((irel->r_offset == offset
9102 && ELF32_R_TYPE (irel->r_info) != R_XTENSA_NONE)
9103 || irel->r_offset > offset)
9108 irel->r_offset -= removed_bytes;
9112 /* Find the next relocation (if there are any left). */
9116 for (irel = offset_rel + 1; irel < rel_end; irel++)
9118 if (ELF32_R_TYPE (irel->r_info) != R_XTENSA_NONE)
9126 /* Check if there are relocations on the current entry. There
9127 should usually be a relocation on the offset field. If there
9128 are relocations on the size or flags, then we can't optimize
9129 this entry. Also, find the next relocation to examine on the
9133 if (offset_rel->r_offset >= offset + entry_size)
9135 next_rel = offset_rel;
9136 /* There are no relocations on the current entry, but we
9137 might still be able to remove it if the size is zero. */
9140 else if (offset_rel->r_offset > offset
9142 && extra_rel->r_offset < offset + entry_size))
9144 /* There is a relocation on the size or flags, so we can't
9145 do anything with this entry. Continue with the next. */
9146 next_rel = offset_rel;
9151 BFD_ASSERT (offset_rel->r_offset == offset);
9152 offset_rel->r_offset -= removed_bytes;
9153 next_rel = offset_rel + 1;
9159 remove_this_rel = FALSE;
9160 bytes_to_remove = 0;
9161 actual_offset = offset - removed_bytes;
9162 size = bfd_get_32 (abfd, &contents[actual_offset + 4]);
9164 if (is_full_prop_section)
9165 flags = bfd_get_32 (abfd, &contents[actual_offset + 8]);
9167 flags = predef_flags;
9170 && (flags & XTENSA_PROP_ALIGN) == 0
9171 && (flags & XTENSA_PROP_UNREACHABLE) == 0)
9173 /* Always remove entries with zero size and no alignment. */
9174 bytes_to_remove = entry_size;
9176 remove_this_rel = TRUE;
9179 && ELF32_R_TYPE (offset_rel->r_info) == R_XTENSA_32)
9185 bfd_get_32 (abfd, &contents[last_irel->r_offset + 4]);
9186 bfd_vma old_address =
9187 (last_irel->r_addend
9188 + bfd_get_32 (abfd, &contents[last_irel->r_offset]));
9189 bfd_vma new_address =
9190 (offset_rel->r_addend
9191 + bfd_get_32 (abfd, &contents[actual_offset]));
9192 if (is_full_prop_section)
9193 old_flags = bfd_get_32
9194 (abfd, &contents[last_irel->r_offset + 8]);
9196 old_flags = predef_flags;
9198 if ((ELF32_R_SYM (offset_rel->r_info)
9199 == ELF32_R_SYM (last_irel->r_info))
9200 && old_address + old_size == new_address
9201 && old_flags == flags
9202 && (old_flags & XTENSA_PROP_INSN_BRANCH_TARGET) == 0
9203 && (old_flags & XTENSA_PROP_INSN_LOOP_TARGET) == 0)
9205 /* Fix the old size. */
9206 bfd_put_32 (abfd, old_size + size,
9207 &contents[last_irel->r_offset + 4]);
9208 bytes_to_remove = entry_size;
9209 remove_this_rel = TRUE;
9212 last_irel = offset_rel;
9215 last_irel = offset_rel;
9218 if (remove_this_rel)
9220 offset_rel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
9221 /* In case this is the last entry, move the relocation offset
9222 to the previous entry, if there is one. */
9223 if (offset_rel->r_offset >= bytes_to_remove)
9224 offset_rel->r_offset -= bytes_to_remove;
9226 offset_rel->r_offset = 0;
9229 if (bytes_to_remove != 0)
9231 removed_bytes += bytes_to_remove;
9232 if (offset + bytes_to_remove < sec->size)
9233 memmove (&contents[actual_offset],
9234 &contents[actual_offset + bytes_to_remove],
9235 sec->size - offset - bytes_to_remove);
9241 /* Fix up any extra relocations on the last entry. */
9242 for (irel = next_rel; irel < rel_end; irel++)
9243 irel->r_offset -= removed_bytes;
9245 /* Clear the removed bytes. */
9246 memset (&contents[sec->size - removed_bytes], 0, removed_bytes);
9248 if (sec->rawsize == 0)
9249 sec->rawsize = sec->size;
9250 sec->size -= removed_bytes;
9252 if (xtensa_is_littable_section (sec))
9254 asection *sgotloc = elf_xtensa_hash_table (link_info)->sgotloc;
9256 sgotloc->size -= removed_bytes;
9262 release_internal_relocs (sec, internal_relocs);
9263 release_contents (sec, contents);
9268 /* Third relaxation pass. */
9270 /* Change symbol values to account for removed literals. */
9273 relax_section_symbols (bfd *abfd, asection *sec)
9275 xtensa_relax_info *relax_info;
9276 unsigned int sec_shndx;
9277 Elf_Internal_Shdr *symtab_hdr;
9278 Elf_Internal_Sym *isymbuf;
9279 unsigned i, num_syms, num_locals;
9281 relax_info = get_xtensa_relax_info (sec);
9282 BFD_ASSERT (relax_info);
9284 if (!relax_info->is_relaxable_literal_section
9285 && !relax_info->is_relaxable_asm_section)
9288 sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
9290 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
9291 isymbuf = retrieve_local_syms (abfd);
9293 num_syms = symtab_hdr->sh_size / sizeof (Elf32_External_Sym);
9294 num_locals = symtab_hdr->sh_info;
9296 /* Adjust the local symbols defined in this section. */
9297 for (i = 0; i < num_locals; i++)
9299 Elf_Internal_Sym *isym = &isymbuf[i];
9301 if (isym->st_shndx == sec_shndx)
9303 text_action *act = relax_info->action_list.head;
9304 bfd_vma orig_addr = isym->st_value;
9306 isym->st_value -= removed_by_actions (&act, orig_addr, FALSE);
9308 if (ELF32_ST_TYPE (isym->st_info) == STT_FUNC)
9310 removed_by_actions (&act, orig_addr + isym->st_size, FALSE);
9314 /* Now adjust the global symbols defined in this section. */
9315 for (i = 0; i < (num_syms - num_locals); i++)
9317 struct elf_link_hash_entry *sym_hash;
9319 sym_hash = elf_sym_hashes (abfd)[i];
9321 if (sym_hash->root.type == bfd_link_hash_warning)
9322 sym_hash = (struct elf_link_hash_entry *) sym_hash->root.u.i.link;
9324 if ((sym_hash->root.type == bfd_link_hash_defined
9325 || sym_hash->root.type == bfd_link_hash_defweak)
9326 && sym_hash->root.u.def.section == sec)
9328 text_action *act = relax_info->action_list.head;
9329 bfd_vma orig_addr = sym_hash->root.u.def.value;
9331 sym_hash->root.u.def.value -=
9332 removed_by_actions (&act, orig_addr, FALSE);
9334 if (sym_hash->type == STT_FUNC)
9336 removed_by_actions (&act, orig_addr + sym_hash->size, FALSE);
9344 /* "Fix" handling functions, called while performing relocations. */
9347 do_fix_for_relocatable_link (Elf_Internal_Rela *rel,
9349 asection *input_section,
9353 asection *sec, *old_sec;
9355 int r_type = ELF32_R_TYPE (rel->r_info);
9358 if (r_type == R_XTENSA_NONE)
9361 fix = get_bfd_fix (input_section, rel->r_offset, r_type);
9365 r_reloc_init (&r_rel, input_bfd, rel, contents,
9366 bfd_get_section_limit (input_bfd, input_section));
9367 old_sec = r_reloc_get_section (&r_rel);
9368 old_offset = r_rel.target_offset;
9370 if (!old_sec || !r_reloc_is_defined (&r_rel))
9372 if (r_type != R_XTENSA_ASM_EXPAND)
9374 (*_bfd_error_handler)
9375 (_("%B(%A+0x%lx): unexpected fix for %s relocation"),
9376 input_bfd, input_section, rel->r_offset,
9377 elf_howto_table[r_type].name);
9380 /* Leave it be. Resolution will happen in a later stage. */
9384 sec = fix->target_sec;
9385 rel->r_addend += ((sec->output_offset + fix->target_offset)
9386 - (old_sec->output_offset + old_offset));
9393 do_fix_for_final_link (Elf_Internal_Rela *rel,
9395 asection *input_section,
9397 bfd_vma *relocationp)
9400 int r_type = ELF32_R_TYPE (rel->r_info);
9404 if (r_type == R_XTENSA_NONE)
9407 fix = get_bfd_fix (input_section, rel->r_offset, r_type);
9411 sec = fix->target_sec;
9413 fixup_diff = rel->r_addend;
9414 if (elf_howto_table[fix->src_type].partial_inplace)
9416 bfd_vma inplace_val;
9417 BFD_ASSERT (fix->src_offset
9418 < bfd_get_section_limit (input_bfd, input_section));
9419 inplace_val = bfd_get_32 (input_bfd, &contents[fix->src_offset]);
9420 fixup_diff += inplace_val;
9423 *relocationp = (sec->output_section->vma
9424 + sec->output_offset
9425 + fix->target_offset - fixup_diff);
9429 /* Miscellaneous utility functions.... */
9432 elf_xtensa_get_plt_section (struct bfd_link_info *info, int chunk)
9434 struct elf_xtensa_link_hash_table *htab;
9440 htab = elf_xtensa_hash_table (info);
9444 dynobj = elf_hash_table (info)->dynobj;
9445 sprintf (plt_name, ".plt.%u", chunk);
9446 return bfd_get_section_by_name (dynobj, plt_name);
9451 elf_xtensa_get_gotplt_section (struct bfd_link_info *info, int chunk)
9453 struct elf_xtensa_link_hash_table *htab;
9459 htab = elf_xtensa_hash_table (info);
9460 return htab->sgotplt;
9463 dynobj = elf_hash_table (info)->dynobj;
9464 sprintf (got_name, ".got.plt.%u", chunk);
9465 return bfd_get_section_by_name (dynobj, got_name);
9469 /* Get the input section for a given symbol index.
9471 . a section symbol, return the section;
9472 . a common symbol, return the common section;
9473 . an undefined symbol, return the undefined section;
9474 . an indirect symbol, follow the links;
9475 . an absolute value, return the absolute section. */
9478 get_elf_r_symndx_section (bfd *abfd, unsigned long r_symndx)
9480 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
9481 asection *target_sec = NULL;
9482 if (r_symndx < symtab_hdr->sh_info)
9484 Elf_Internal_Sym *isymbuf;
9485 unsigned int section_index;
9487 isymbuf = retrieve_local_syms (abfd);
9488 section_index = isymbuf[r_symndx].st_shndx;
9490 if (section_index == SHN_UNDEF)
9491 target_sec = bfd_und_section_ptr;
9492 else if (section_index > 0 && section_index < SHN_LORESERVE)
9493 target_sec = bfd_section_from_elf_index (abfd, section_index);
9494 else if (section_index == SHN_ABS)
9495 target_sec = bfd_abs_section_ptr;
9496 else if (section_index == SHN_COMMON)
9497 target_sec = bfd_com_section_ptr;
9504 unsigned long indx = r_symndx - symtab_hdr->sh_info;
9505 struct elf_link_hash_entry *h = elf_sym_hashes (abfd)[indx];
9507 while (h->root.type == bfd_link_hash_indirect
9508 || h->root.type == bfd_link_hash_warning)
9509 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9511 switch (h->root.type)
9513 case bfd_link_hash_defined:
9514 case bfd_link_hash_defweak:
9515 target_sec = h->root.u.def.section;
9517 case bfd_link_hash_common:
9518 target_sec = bfd_com_section_ptr;
9520 case bfd_link_hash_undefined:
9521 case bfd_link_hash_undefweak:
9522 target_sec = bfd_und_section_ptr;
9524 default: /* New indirect warning. */
9525 target_sec = bfd_und_section_ptr;
9533 static struct elf_link_hash_entry *
9534 get_elf_r_symndx_hash_entry (bfd *abfd, unsigned long r_symndx)
9537 struct elf_link_hash_entry *h;
9538 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
9540 if (r_symndx < symtab_hdr->sh_info)
9543 indx = r_symndx - symtab_hdr->sh_info;
9544 h = elf_sym_hashes (abfd)[indx];
9545 while (h->root.type == bfd_link_hash_indirect
9546 || h->root.type == bfd_link_hash_warning)
9547 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9552 /* Get the section-relative offset for a symbol number. */
9555 get_elf_r_symndx_offset (bfd *abfd, unsigned long r_symndx)
9557 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
9560 if (r_symndx < symtab_hdr->sh_info)
9562 Elf_Internal_Sym *isymbuf;
9563 isymbuf = retrieve_local_syms (abfd);
9564 offset = isymbuf[r_symndx].st_value;
9568 unsigned long indx = r_symndx - symtab_hdr->sh_info;
9569 struct elf_link_hash_entry *h =
9570 elf_sym_hashes (abfd)[indx];
9572 while (h->root.type == bfd_link_hash_indirect
9573 || h->root.type == bfd_link_hash_warning)
9574 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9575 if (h->root.type == bfd_link_hash_defined
9576 || h->root.type == bfd_link_hash_defweak)
9577 offset = h->root.u.def.value;
9584 is_reloc_sym_weak (bfd *abfd, Elf_Internal_Rela *rel)
9586 unsigned long r_symndx = ELF32_R_SYM (rel->r_info);
9587 struct elf_link_hash_entry *h;
9589 h = get_elf_r_symndx_hash_entry (abfd, r_symndx);
9590 if (h && h->root.type == bfd_link_hash_defweak)
9597 pcrel_reloc_fits (xtensa_opcode opc,
9599 bfd_vma self_address,
9600 bfd_vma dest_address)
9602 xtensa_isa isa = xtensa_default_isa;
9603 uint32 valp = dest_address;
9604 if (xtensa_operand_do_reloc (isa, opc, opnd, &valp, self_address)
9605 || xtensa_operand_encode (isa, opc, opnd, &valp))
9612 xtensa_is_property_section (asection *sec)
9614 if (xtensa_is_insntable_section (sec)
9615 || xtensa_is_littable_section (sec)
9616 || xtensa_is_proptable_section (sec))
9624 xtensa_is_insntable_section (asection *sec)
9626 if (CONST_STRNEQ (sec->name, XTENSA_INSN_SEC_NAME)
9627 || CONST_STRNEQ (sec->name, ".gnu.linkonce.x."))
9635 xtensa_is_littable_section (asection *sec)
9637 if (CONST_STRNEQ (sec->name, XTENSA_LIT_SEC_NAME)
9638 || CONST_STRNEQ (sec->name, ".gnu.linkonce.p."))
9646 xtensa_is_proptable_section (asection *sec)
9648 if (CONST_STRNEQ (sec->name, XTENSA_PROP_SEC_NAME)
9649 || CONST_STRNEQ (sec->name, ".gnu.linkonce.prop."))
9657 internal_reloc_compare (const void *ap, const void *bp)
9659 const Elf_Internal_Rela *a = (const Elf_Internal_Rela *) ap;
9660 const Elf_Internal_Rela *b = (const Elf_Internal_Rela *) bp;
9662 if (a->r_offset != b->r_offset)
9663 return (a->r_offset - b->r_offset);
9665 /* We don't need to sort on these criteria for correctness,
9666 but enforcing a more strict ordering prevents unstable qsort
9667 from behaving differently with different implementations.
9668 Without the code below we get correct but different results
9669 on Solaris 2.7 and 2.8. We would like to always produce the
9670 same results no matter the host. */
9672 if (a->r_info != b->r_info)
9673 return (a->r_info - b->r_info);
9675 return (a->r_addend - b->r_addend);
9680 internal_reloc_matches (const void *ap, const void *bp)
9682 const Elf_Internal_Rela *a = (const Elf_Internal_Rela *) ap;
9683 const Elf_Internal_Rela *b = (const Elf_Internal_Rela *) bp;
9685 /* Check if one entry overlaps with the other; this shouldn't happen
9686 except when searching for a match. */
9687 return (a->r_offset - b->r_offset);
9691 /* Predicate function used to look up a section in a particular group. */
9694 match_section_group (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, void *inf)
9696 const char *gname = inf;
9697 const char *group_name = elf_group_name (sec);
9699 return (group_name == gname
9700 || (group_name != NULL
9702 && strcmp (group_name, gname) == 0));
9706 static int linkonce_len = sizeof (".gnu.linkonce.") - 1;
9709 xtensa_get_property_section (asection *sec, const char *base_name)
9711 const char *suffix, *group_name;
9712 char *prop_sec_name;
9715 group_name = elf_group_name (sec);
9718 suffix = strrchr (sec->name, '.');
9719 if (suffix == sec->name)
9721 prop_sec_name = (char *) bfd_malloc (strlen (base_name) + 1
9722 + (suffix ? strlen (suffix) : 0));
9723 strcpy (prop_sec_name, base_name);
9725 strcat (prop_sec_name, suffix);
9727 else if (strncmp (sec->name, ".gnu.linkonce.", linkonce_len) == 0)
9729 char *linkonce_kind = 0;
9731 if (strcmp (base_name, XTENSA_INSN_SEC_NAME) == 0)
9732 linkonce_kind = "x.";
9733 else if (strcmp (base_name, XTENSA_LIT_SEC_NAME) == 0)
9734 linkonce_kind = "p.";
9735 else if (strcmp (base_name, XTENSA_PROP_SEC_NAME) == 0)
9736 linkonce_kind = "prop.";
9740 prop_sec_name = (char *) bfd_malloc (strlen (sec->name)
9741 + strlen (linkonce_kind) + 1);
9742 memcpy (prop_sec_name, ".gnu.linkonce.", linkonce_len);
9743 strcpy (prop_sec_name + linkonce_len, linkonce_kind);
9745 suffix = sec->name + linkonce_len;
9746 /* For backward compatibility, replace "t." instead of inserting
9747 the new linkonce_kind (but not for "prop" sections). */
9748 if (CONST_STRNEQ (suffix, "t.") && linkonce_kind[1] == '.')
9750 strcat (prop_sec_name + linkonce_len, suffix);
9753 prop_sec_name = strdup (base_name);
9755 /* Check if the section already exists. */
9756 prop_sec = bfd_get_section_by_name_if (sec->owner, prop_sec_name,
9757 match_section_group,
9758 (void *) group_name);
9759 /* If not, create it. */
9762 flagword flags = (SEC_RELOC | SEC_HAS_CONTENTS | SEC_READONLY);
9763 flags |= (bfd_get_section_flags (sec->owner, sec)
9764 & (SEC_LINK_ONCE | SEC_LINK_DUPLICATES));
9766 prop_sec = bfd_make_section_anyway_with_flags
9767 (sec->owner, strdup (prop_sec_name), flags);
9771 elf_group_name (prop_sec) = group_name;
9774 free (prop_sec_name);
9780 xtensa_get_property_predef_flags (asection *sec)
9782 if (xtensa_is_insntable_section (sec))
9783 return (XTENSA_PROP_INSN
9784 | XTENSA_PROP_NO_TRANSFORM
9785 | XTENSA_PROP_INSN_NO_REORDER);
9787 if (xtensa_is_littable_section (sec))
9788 return (XTENSA_PROP_LITERAL
9789 | XTENSA_PROP_NO_TRANSFORM
9790 | XTENSA_PROP_INSN_NO_REORDER);
9796 /* Other functions called directly by the linker. */
9799 xtensa_callback_required_dependence (bfd *abfd,
9801 struct bfd_link_info *link_info,
9802 deps_callback_t callback,
9805 Elf_Internal_Rela *internal_relocs;
9808 bfd_boolean ok = TRUE;
9809 bfd_size_type sec_size;
9811 sec_size = bfd_get_section_limit (abfd, sec);
9813 /* ".plt*" sections have no explicit relocations but they contain L32R
9814 instructions that reference the corresponding ".got.plt*" sections. */
9815 if ((sec->flags & SEC_LINKER_CREATED) != 0
9816 && CONST_STRNEQ (sec->name, ".plt"))
9820 /* Find the corresponding ".got.plt*" section. */
9821 if (sec->name[4] == '\0')
9822 sgotplt = bfd_get_section_by_name (sec->owner, ".got.plt");
9828 BFD_ASSERT (sec->name[4] == '.');
9829 chunk = strtol (&sec->name[5], NULL, 10);
9831 sprintf (got_name, ".got.plt.%u", chunk);
9832 sgotplt = bfd_get_section_by_name (sec->owner, got_name);
9834 BFD_ASSERT (sgotplt);
9836 /* Assume worst-case offsets: L32R at the very end of the ".plt"
9837 section referencing a literal at the very beginning of
9838 ".got.plt". This is very close to the real dependence, anyway. */
9839 (*callback) (sec, sec_size, sgotplt, 0, closure);
9842 /* Only ELF files are supported for Xtensa. Check here to avoid a segfault
9843 when building uclibc, which runs "ld -b binary /dev/null". */
9844 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
9847 internal_relocs = retrieve_internal_relocs (abfd, sec,
9848 link_info->keep_memory);
9849 if (internal_relocs == NULL
9850 || sec->reloc_count == 0)
9853 /* Cache the contents for the duration of this scan. */
9854 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
9855 if (contents == NULL && sec_size != 0)
9861 if (!xtensa_default_isa)
9862 xtensa_default_isa = xtensa_isa_init (0, 0);
9864 for (i = 0; i < sec->reloc_count; i++)
9866 Elf_Internal_Rela *irel = &internal_relocs[i];
9867 if (is_l32r_relocation (abfd, sec, contents, irel))
9870 asection *target_sec;
9871 bfd_vma target_offset;
9873 r_reloc_init (&l32r_rel, abfd, irel, contents, sec_size);
9876 /* L32Rs must be local to the input file. */
9877 if (r_reloc_is_defined (&l32r_rel))
9879 target_sec = r_reloc_get_section (&l32r_rel);
9880 target_offset = l32r_rel.target_offset;
9882 (*callback) (sec, irel->r_offset, target_sec, target_offset,
9888 release_internal_relocs (sec, internal_relocs);
9889 release_contents (sec, contents);
9893 /* The default literal sections should always be marked as "code" (i.e.,
9894 SHF_EXECINSTR). This is particularly important for the Linux kernel
9895 module loader so that the literals are not placed after the text. */
9896 static const struct bfd_elf_special_section elf_xtensa_special_sections[] =
9898 { STRING_COMMA_LEN (".fini.literal"), 0, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR },
9899 { STRING_COMMA_LEN (".init.literal"), 0, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR },
9900 { STRING_COMMA_LEN (".literal"), 0, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR },
9901 { STRING_COMMA_LEN (".xtensa.info"), 0, SHT_NOTE, 0 },
9902 { NULL, 0, 0, 0, 0 }
9906 #define TARGET_LITTLE_SYM bfd_elf32_xtensa_le_vec
9907 #define TARGET_LITTLE_NAME "elf32-xtensa-le"
9908 #define TARGET_BIG_SYM bfd_elf32_xtensa_be_vec
9909 #define TARGET_BIG_NAME "elf32-xtensa-be"
9910 #define ELF_ARCH bfd_arch_xtensa
9912 #define ELF_MACHINE_CODE EM_XTENSA
9913 #define ELF_MACHINE_ALT1 EM_XTENSA_OLD
9916 #define ELF_MAXPAGESIZE (1 << XCHAL_MMU_MIN_PTE_PAGE_SIZE)
9917 #else /* !XCHAL_HAVE_MMU */
9918 #define ELF_MAXPAGESIZE 1
9919 #endif /* !XCHAL_HAVE_MMU */
9920 #endif /* ELF_ARCH */
9922 #define elf_backend_can_gc_sections 1
9923 #define elf_backend_can_refcount 1
9924 #define elf_backend_plt_readonly 1
9925 #define elf_backend_got_header_size 4
9926 #define elf_backend_want_dynbss 0
9927 #define elf_backend_want_got_plt 1
9929 #define elf_info_to_howto elf_xtensa_info_to_howto_rela
9931 #define bfd_elf32_bfd_merge_private_bfd_data elf_xtensa_merge_private_bfd_data
9932 #define bfd_elf32_new_section_hook elf_xtensa_new_section_hook
9933 #define bfd_elf32_bfd_print_private_bfd_data elf_xtensa_print_private_bfd_data
9934 #define bfd_elf32_bfd_relax_section elf_xtensa_relax_section
9935 #define bfd_elf32_bfd_reloc_type_lookup elf_xtensa_reloc_type_lookup
9936 #define bfd_elf32_bfd_reloc_name_lookup \
9937 elf_xtensa_reloc_name_lookup
9938 #define bfd_elf32_bfd_set_private_flags elf_xtensa_set_private_flags
9939 #define bfd_elf32_bfd_link_hash_table_create elf_xtensa_link_hash_table_create
9941 #define elf_backend_adjust_dynamic_symbol elf_xtensa_adjust_dynamic_symbol
9942 #define elf_backend_check_relocs elf_xtensa_check_relocs
9943 #define elf_backend_create_dynamic_sections elf_xtensa_create_dynamic_sections
9944 #define elf_backend_discard_info elf_xtensa_discard_info
9945 #define elf_backend_ignore_discarded_relocs elf_xtensa_ignore_discarded_relocs
9946 #define elf_backend_final_write_processing elf_xtensa_final_write_processing
9947 #define elf_backend_finish_dynamic_sections elf_xtensa_finish_dynamic_sections
9948 #define elf_backend_finish_dynamic_symbol elf_xtensa_finish_dynamic_symbol
9949 #define elf_backend_gc_mark_hook elf_xtensa_gc_mark_hook
9950 #define elf_backend_gc_sweep_hook elf_xtensa_gc_sweep_hook
9951 #define elf_backend_grok_prstatus elf_xtensa_grok_prstatus
9952 #define elf_backend_grok_psinfo elf_xtensa_grok_psinfo
9953 #define elf_backend_hide_symbol elf_xtensa_hide_symbol
9954 #define elf_backend_object_p elf_xtensa_object_p
9955 #define elf_backend_reloc_type_class elf_xtensa_reloc_type_class
9956 #define elf_backend_relocate_section elf_xtensa_relocate_section
9957 #define elf_backend_size_dynamic_sections elf_xtensa_size_dynamic_sections
9958 #define elf_backend_omit_section_dynsym \
9959 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
9960 #define elf_backend_special_sections elf_xtensa_special_sections
9961 #define elf_backend_action_discarded elf_xtensa_action_discarded
9963 #include "elf32-target.h"