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 ((sec->flags & SEC_ALLOC) == 0)
1018 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1019 sym_hashes = elf_sym_hashes (abfd);
1020 local_got_refcounts = elf_local_got_refcounts (abfd);
1022 relend = relocs + sec->reloc_count;
1023 for (rel = relocs; rel < relend; rel++)
1025 unsigned long r_symndx;
1026 unsigned int r_type;
1027 struct elf_link_hash_entry *h = NULL;
1029 r_symndx = ELF32_R_SYM (rel->r_info);
1030 if (r_symndx >= symtab_hdr->sh_info)
1032 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1033 while (h->root.type == bfd_link_hash_indirect
1034 || h->root.type == bfd_link_hash_warning)
1035 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1038 r_type = ELF32_R_TYPE (rel->r_info);
1044 if (h->got.refcount > 0)
1051 if (h->plt.refcount > 0)
1056 if (local_got_refcounts[r_symndx] > 0)
1057 local_got_refcounts[r_symndx] -= 1;
1069 /* Create all the dynamic sections. */
1072 elf_xtensa_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
1074 struct elf_xtensa_link_hash_table *htab;
1075 flagword flags, noalloc_flags;
1077 htab = elf_xtensa_hash_table (info);
1079 /* First do all the standard stuff. */
1080 if (! _bfd_elf_create_dynamic_sections (dynobj, info))
1082 htab->splt = bfd_get_section_by_name (dynobj, ".plt");
1083 htab->srelplt = bfd_get_section_by_name (dynobj, ".rela.plt");
1084 htab->sgot = bfd_get_section_by_name (dynobj, ".got");
1085 htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
1087 /* Create any extra PLT sections in case check_relocs has already
1088 been called on all the non-dynamic input files. */
1089 if (! add_extra_plt_sections (info, htab->plt_reloc_count))
1092 noalloc_flags = (SEC_HAS_CONTENTS | SEC_IN_MEMORY
1093 | SEC_LINKER_CREATED | SEC_READONLY);
1094 flags = noalloc_flags | SEC_ALLOC | SEC_LOAD;
1096 /* Mark the ".got.plt" section READONLY. */
1097 if (htab->sgotplt == NULL
1098 || ! bfd_set_section_flags (dynobj, htab->sgotplt, flags))
1101 /* Create ".rela.got". */
1102 htab->srelgot = bfd_make_section_with_flags (dynobj, ".rela.got", flags);
1103 if (htab->srelgot == NULL
1104 || ! bfd_set_section_alignment (dynobj, htab->srelgot, 2))
1107 /* Create ".got.loc" (literal tables for use by dynamic linker). */
1108 htab->sgotloc = bfd_make_section_with_flags (dynobj, ".got.loc", flags);
1109 if (htab->sgotloc == NULL
1110 || ! bfd_set_section_alignment (dynobj, htab->sgotloc, 2))
1113 /* Create ".xt.lit.plt" (literal table for ".got.plt*"). */
1114 htab->spltlittbl = bfd_make_section_with_flags (dynobj, ".xt.lit.plt",
1116 if (htab->spltlittbl == NULL
1117 || ! bfd_set_section_alignment (dynobj, htab->spltlittbl, 2))
1125 add_extra_plt_sections (struct bfd_link_info *info, int count)
1127 bfd *dynobj = elf_hash_table (info)->dynobj;
1130 /* Iterate over all chunks except 0 which uses the standard ".plt" and
1131 ".got.plt" sections. */
1132 for (chunk = count / PLT_ENTRIES_PER_CHUNK; chunk > 0; chunk--)
1138 /* Stop when we find a section has already been created. */
1139 if (elf_xtensa_get_plt_section (info, chunk))
1142 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1143 | SEC_LINKER_CREATED | SEC_READONLY);
1145 sname = (char *) bfd_malloc (10);
1146 sprintf (sname, ".plt.%u", chunk);
1147 s = bfd_make_section_with_flags (dynobj, sname, flags | SEC_CODE);
1149 || ! bfd_set_section_alignment (dynobj, s, 2))
1152 sname = (char *) bfd_malloc (14);
1153 sprintf (sname, ".got.plt.%u", chunk);
1154 s = bfd_make_section_with_flags (dynobj, sname, flags);
1156 || ! bfd_set_section_alignment (dynobj, s, 2))
1164 /* Adjust a symbol defined by a dynamic object and referenced by a
1165 regular object. The current definition is in some section of the
1166 dynamic object, but we're not including those sections. We have to
1167 change the definition to something the rest of the link can
1171 elf_xtensa_adjust_dynamic_symbol (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1172 struct elf_link_hash_entry *h)
1174 /* If this is a weak symbol, and there is a real definition, the
1175 processor independent code will have arranged for us to see the
1176 real definition first, and we can just use the same value. */
1179 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1180 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1181 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1182 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1186 /* This is a reference to a symbol defined by a dynamic object. The
1187 reference must go through the GOT, so there's no need for COPY relocs,
1195 elf_xtensa_allocate_dynrelocs (struct elf_link_hash_entry *h, void *arg)
1197 struct bfd_link_info *info;
1198 struct elf_xtensa_link_hash_table *htab;
1199 bfd_boolean is_dynamic;
1201 if (h->root.type == bfd_link_hash_indirect)
1204 if (h->root.type == bfd_link_hash_warning)
1205 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1207 info = (struct bfd_link_info *) arg;
1208 htab = elf_xtensa_hash_table (info);
1210 is_dynamic = elf_xtensa_dynamic_symbol_p (h, info);
1213 elf_xtensa_make_sym_local (info, h);
1215 if (h->plt.refcount > 0)
1216 htab->srelplt->size += (h->plt.refcount * sizeof (Elf32_External_Rela));
1218 if (h->got.refcount > 0)
1219 htab->srelgot->size += (h->got.refcount * sizeof (Elf32_External_Rela));
1226 elf_xtensa_allocate_local_got_size (struct bfd_link_info *info)
1228 struct elf_xtensa_link_hash_table *htab;
1231 htab = elf_xtensa_hash_table (info);
1233 for (i = info->input_bfds; i; i = i->link_next)
1235 bfd_signed_vma *local_got_refcounts;
1236 bfd_size_type j, cnt;
1237 Elf_Internal_Shdr *symtab_hdr;
1239 local_got_refcounts = elf_local_got_refcounts (i);
1240 if (!local_got_refcounts)
1243 symtab_hdr = &elf_tdata (i)->symtab_hdr;
1244 cnt = symtab_hdr->sh_info;
1246 for (j = 0; j < cnt; ++j)
1248 if (local_got_refcounts[j] > 0)
1249 htab->srelgot->size += (local_got_refcounts[j]
1250 * sizeof (Elf32_External_Rela));
1256 /* Set the sizes of the dynamic sections. */
1259 elf_xtensa_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
1260 struct bfd_link_info *info)
1262 struct elf_xtensa_link_hash_table *htab;
1264 asection *s, *srelplt, *splt, *sgotplt, *srelgot, *spltlittbl, *sgotloc;
1265 bfd_boolean relplt, relgot;
1266 int plt_entries, plt_chunks, chunk;
1271 htab = elf_xtensa_hash_table (info);
1272 dynobj = elf_hash_table (info)->dynobj;
1275 srelgot = htab->srelgot;
1276 srelplt = htab->srelplt;
1278 if (elf_hash_table (info)->dynamic_sections_created)
1280 BFD_ASSERT (htab->srelgot != NULL
1281 && htab->srelplt != NULL
1282 && htab->sgot != NULL
1283 && htab->spltlittbl != NULL
1284 && htab->sgotloc != NULL);
1286 /* Set the contents of the .interp section to the interpreter. */
1287 if (info->executable)
1289 s = bfd_get_section_by_name (dynobj, ".interp");
1292 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
1293 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1296 /* Allocate room for one word in ".got". */
1297 htab->sgot->size = 4;
1299 /* Allocate space in ".rela.got" for literals that reference global
1300 symbols and space in ".rela.plt" for literals that have PLT
1302 elf_link_hash_traverse (elf_hash_table (info),
1303 elf_xtensa_allocate_dynrelocs,
1306 /* If we are generating a shared object, we also need space in
1307 ".rela.got" for R_XTENSA_RELATIVE relocs for literals that
1308 reference local symbols. */
1310 elf_xtensa_allocate_local_got_size (info);
1312 /* Allocate space in ".plt" to match the size of ".rela.plt". For
1313 each PLT entry, we need the PLT code plus a 4-byte literal.
1314 For each chunk of ".plt", we also need two more 4-byte
1315 literals, two corresponding entries in ".rela.got", and an
1316 8-byte entry in ".xt.lit.plt". */
1317 spltlittbl = htab->spltlittbl;
1318 plt_entries = srelplt->size / sizeof (Elf32_External_Rela);
1320 (plt_entries + PLT_ENTRIES_PER_CHUNK - 1) / PLT_ENTRIES_PER_CHUNK;
1322 /* Iterate over all the PLT chunks, including any extra sections
1323 created earlier because the initial count of PLT relocations
1324 was an overestimate. */
1326 (splt = elf_xtensa_get_plt_section (info, chunk)) != NULL;
1331 sgotplt = elf_xtensa_get_gotplt_section (info, chunk);
1332 BFD_ASSERT (sgotplt != NULL);
1334 if (chunk < plt_chunks - 1)
1335 chunk_entries = PLT_ENTRIES_PER_CHUNK;
1336 else if (chunk == plt_chunks - 1)
1337 chunk_entries = plt_entries - (chunk * PLT_ENTRIES_PER_CHUNK);
1341 if (chunk_entries != 0)
1343 sgotplt->size = 4 * (chunk_entries + 2);
1344 splt->size = PLT_ENTRY_SIZE * chunk_entries;
1345 srelgot->size += 2 * sizeof (Elf32_External_Rela);
1346 spltlittbl->size += 8;
1355 /* Allocate space in ".got.loc" to match the total size of all the
1357 sgotloc = htab->sgotloc;
1358 sgotloc->size = spltlittbl->size;
1359 for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link_next)
1361 if (abfd->flags & DYNAMIC)
1363 for (s = abfd->sections; s != NULL; s = s->next)
1365 if (! elf_discarded_section (s)
1366 && xtensa_is_littable_section (s)
1368 sgotloc->size += s->size;
1373 /* Allocate memory for dynamic sections. */
1376 for (s = dynobj->sections; s != NULL; s = s->next)
1380 if ((s->flags & SEC_LINKER_CREATED) == 0)
1383 /* It's OK to base decisions on the section name, because none
1384 of the dynobj section names depend upon the input files. */
1385 name = bfd_get_section_name (dynobj, s);
1387 if (CONST_STRNEQ (name, ".rela"))
1391 if (strcmp (name, ".rela.plt") == 0)
1393 else if (strcmp (name, ".rela.got") == 0)
1396 /* We use the reloc_count field as a counter if we need
1397 to copy relocs into the output file. */
1401 else if (! CONST_STRNEQ (name, ".plt.")
1402 && ! CONST_STRNEQ (name, ".got.plt.")
1403 && strcmp (name, ".got") != 0
1404 && strcmp (name, ".plt") != 0
1405 && strcmp (name, ".got.plt") != 0
1406 && strcmp (name, ".xt.lit.plt") != 0
1407 && strcmp (name, ".got.loc") != 0)
1409 /* It's not one of our sections, so don't allocate space. */
1415 /* If we don't need this section, strip it from the output
1416 file. We must create the ".plt*" and ".got.plt*"
1417 sections in create_dynamic_sections and/or check_relocs
1418 based on a conservative estimate of the PLT relocation
1419 count, because the sections must be created before the
1420 linker maps input sections to output sections. The
1421 linker does that before size_dynamic_sections, where we
1422 compute the exact size of the PLT, so there may be more
1423 of these sections than are actually needed. */
1424 s->flags |= SEC_EXCLUDE;
1426 else if ((s->flags & SEC_HAS_CONTENTS) != 0)
1428 /* Allocate memory for the section contents. */
1429 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
1430 if (s->contents == NULL)
1435 if (elf_hash_table (info)->dynamic_sections_created)
1437 /* Add the special XTENSA_RTLD relocations now. The offsets won't be
1438 known until finish_dynamic_sections, but we need to get the relocs
1439 in place before they are sorted. */
1440 for (chunk = 0; chunk < plt_chunks; chunk++)
1442 Elf_Internal_Rela irela;
1446 irela.r_info = ELF32_R_INFO (0, R_XTENSA_RTLD);
1449 loc = (srelgot->contents
1450 + srelgot->reloc_count * sizeof (Elf32_External_Rela));
1451 bfd_elf32_swap_reloca_out (output_bfd, &irela, loc);
1452 bfd_elf32_swap_reloca_out (output_bfd, &irela,
1453 loc + sizeof (Elf32_External_Rela));
1454 srelgot->reloc_count += 2;
1457 /* Add some entries to the .dynamic section. We fill in the
1458 values later, in elf_xtensa_finish_dynamic_sections, but we
1459 must add the entries now so that we get the correct size for
1460 the .dynamic section. The DT_DEBUG entry is filled in by the
1461 dynamic linker and used by the debugger. */
1462 #define add_dynamic_entry(TAG, VAL) \
1463 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
1465 if (info->executable)
1467 if (!add_dynamic_entry (DT_DEBUG, 0))
1473 if (!add_dynamic_entry (DT_PLTRELSZ, 0)
1474 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
1475 || !add_dynamic_entry (DT_JMPREL, 0))
1481 if (!add_dynamic_entry (DT_RELA, 0)
1482 || !add_dynamic_entry (DT_RELASZ, 0)
1483 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
1487 if (!add_dynamic_entry (DT_PLTGOT, 0)
1488 || !add_dynamic_entry (DT_XTENSA_GOT_LOC_OFF, 0)
1489 || !add_dynamic_entry (DT_XTENSA_GOT_LOC_SZ, 0))
1492 #undef add_dynamic_entry
1498 /* Perform the specified relocation. The instruction at (contents + address)
1499 is modified to set one operand to represent the value in "relocation". The
1500 operand position is determined by the relocation type recorded in the
1503 #define CALL_SEGMENT_BITS (30)
1504 #define CALL_SEGMENT_SIZE (1 << CALL_SEGMENT_BITS)
1506 static bfd_reloc_status_type
1507 elf_xtensa_do_reloc (reloc_howto_type *howto,
1509 asection *input_section,
1513 bfd_boolean is_weak_undef,
1514 char **error_message)
1517 xtensa_opcode opcode;
1518 xtensa_isa isa = xtensa_default_isa;
1519 static xtensa_insnbuf ibuff = NULL;
1520 static xtensa_insnbuf sbuff = NULL;
1521 bfd_vma self_address;
1522 bfd_size_type input_size;
1528 ibuff = xtensa_insnbuf_alloc (isa);
1529 sbuff = xtensa_insnbuf_alloc (isa);
1532 input_size = bfd_get_section_limit (abfd, input_section);
1534 /* Calculate the PC address for this instruction. */
1535 self_address = (input_section->output_section->vma
1536 + input_section->output_offset
1539 switch (howto->type)
1542 case R_XTENSA_DIFF8:
1543 case R_XTENSA_DIFF16:
1544 case R_XTENSA_DIFF32:
1545 return bfd_reloc_ok;
1547 case R_XTENSA_ASM_EXPAND:
1550 /* Check for windowed CALL across a 1GB boundary. */
1551 xtensa_opcode opcode =
1552 get_expanded_call_opcode (contents + address,
1553 input_size - address, 0);
1554 if (is_windowed_call_opcode (opcode))
1556 if ((self_address >> CALL_SEGMENT_BITS)
1557 != (relocation >> CALL_SEGMENT_BITS))
1559 *error_message = "windowed longcall crosses 1GB boundary; "
1561 return bfd_reloc_dangerous;
1565 return bfd_reloc_ok;
1567 case R_XTENSA_ASM_SIMPLIFY:
1569 /* Convert the L32R/CALLX to CALL. */
1570 bfd_reloc_status_type retval =
1571 elf_xtensa_do_asm_simplify (contents, address, input_size,
1573 if (retval != bfd_reloc_ok)
1574 return bfd_reloc_dangerous;
1576 /* The CALL needs to be relocated. Continue below for that part. */
1578 howto = &elf_howto_table[(unsigned) R_XTENSA_SLOT0_OP ];
1586 x = bfd_get_32 (abfd, contents + address);
1588 bfd_put_32 (abfd, x, contents + address);
1590 return bfd_reloc_ok;
1592 case R_XTENSA_32_PCREL:
1593 bfd_put_32 (abfd, relocation - self_address, contents + address);
1594 return bfd_reloc_ok;
1597 /* Only instruction slot-specific relocations handled below.... */
1598 slot = get_relocation_slot (howto->type);
1599 if (slot == XTENSA_UNDEFINED)
1601 *error_message = "unexpected relocation";
1602 return bfd_reloc_dangerous;
1605 /* Read the instruction into a buffer and decode the opcode. */
1606 xtensa_insnbuf_from_chars (isa, ibuff, contents + address,
1607 input_size - address);
1608 fmt = xtensa_format_decode (isa, ibuff);
1609 if (fmt == XTENSA_UNDEFINED)
1611 *error_message = "cannot decode instruction format";
1612 return bfd_reloc_dangerous;
1615 xtensa_format_get_slot (isa, fmt, slot, ibuff, sbuff);
1617 opcode = xtensa_opcode_decode (isa, fmt, slot, sbuff);
1618 if (opcode == XTENSA_UNDEFINED)
1620 *error_message = "cannot decode instruction opcode";
1621 return bfd_reloc_dangerous;
1624 /* Check for opcode-specific "alternate" relocations. */
1625 if (is_alt_relocation (howto->type))
1627 if (opcode == get_l32r_opcode ())
1629 /* Handle the special-case of non-PC-relative L32R instructions. */
1630 bfd *output_bfd = input_section->output_section->owner;
1631 asection *lit4_sec = bfd_get_section_by_name (output_bfd, ".lit4");
1634 *error_message = "relocation references missing .lit4 section";
1635 return bfd_reloc_dangerous;
1637 self_address = ((lit4_sec->vma & ~0xfff)
1638 + 0x40000 - 3); /* -3 to compensate for do_reloc */
1639 newval = relocation;
1642 else if (opcode == get_const16_opcode ())
1644 /* ALT used for high 16 bits. */
1645 newval = relocation >> 16;
1650 /* No other "alternate" relocations currently defined. */
1651 *error_message = "unexpected relocation";
1652 return bfd_reloc_dangerous;
1655 else /* Not an "alternate" relocation.... */
1657 if (opcode == get_const16_opcode ())
1659 newval = relocation & 0xffff;
1664 /* ...normal PC-relative relocation.... */
1666 /* Determine which operand is being relocated. */
1667 opnd = get_relocation_opnd (opcode, howto->type);
1668 if (opnd == XTENSA_UNDEFINED)
1670 *error_message = "unexpected relocation";
1671 return bfd_reloc_dangerous;
1674 if (!howto->pc_relative)
1676 *error_message = "expected PC-relative relocation";
1677 return bfd_reloc_dangerous;
1680 newval = relocation;
1684 /* Apply the relocation. */
1685 if (xtensa_operand_do_reloc (isa, opcode, opnd, &newval, self_address)
1686 || xtensa_operand_encode (isa, opcode, opnd, &newval)
1687 || xtensa_operand_set_field (isa, opcode, opnd, fmt, slot,
1690 const char *opname = xtensa_opcode_name (isa, opcode);
1693 msg = "cannot encode";
1694 if (is_direct_call_opcode (opcode))
1696 if ((relocation & 0x3) != 0)
1697 msg = "misaligned call target";
1699 msg = "call target out of range";
1701 else if (opcode == get_l32r_opcode ())
1703 if ((relocation & 0x3) != 0)
1704 msg = "misaligned literal target";
1705 else if (is_alt_relocation (howto->type))
1706 msg = "literal target out of range (too many literals)";
1707 else if (self_address > relocation)
1708 msg = "literal target out of range (try using text-section-literals)";
1710 msg = "literal placed after use";
1713 *error_message = vsprint_msg (opname, ": %s", strlen (msg) + 2, msg);
1714 return bfd_reloc_dangerous;
1717 /* Check for calls across 1GB boundaries. */
1718 if (is_direct_call_opcode (opcode)
1719 && is_windowed_call_opcode (opcode))
1721 if ((self_address >> CALL_SEGMENT_BITS)
1722 != (relocation >> CALL_SEGMENT_BITS))
1725 "windowed call crosses 1GB boundary; return may fail";
1726 return bfd_reloc_dangerous;
1730 /* Write the modified instruction back out of the buffer. */
1731 xtensa_format_set_slot (isa, fmt, slot, ibuff, sbuff);
1732 xtensa_insnbuf_to_chars (isa, ibuff, contents + address,
1733 input_size - address);
1734 return bfd_reloc_ok;
1739 vsprint_msg (const char *origmsg, const char *fmt, int arglen, ...)
1741 /* To reduce the size of the memory leak,
1742 we only use a single message buffer. */
1743 static bfd_size_type alloc_size = 0;
1744 static char *message = NULL;
1745 bfd_size_type orig_len, len = 0;
1746 bfd_boolean is_append;
1748 VA_OPEN (ap, arglen);
1749 VA_FIXEDARG (ap, const char *, origmsg);
1751 is_append = (origmsg == message);
1753 orig_len = strlen (origmsg);
1754 len = orig_len + strlen (fmt) + arglen + 20;
1755 if (len > alloc_size)
1757 message = (char *) bfd_realloc (message, len);
1761 memcpy (message, origmsg, orig_len);
1762 vsprintf (message + orig_len, fmt, ap);
1768 /* This function is registered as the "special_function" in the
1769 Xtensa howto for handling simplify operations.
1770 bfd_perform_relocation / bfd_install_relocation use it to
1771 perform (install) the specified relocation. Since this replaces the code
1772 in bfd_perform_relocation, it is basically an Xtensa-specific,
1773 stripped-down version of bfd_perform_relocation. */
1775 static bfd_reloc_status_type
1776 bfd_elf_xtensa_reloc (bfd *abfd,
1777 arelent *reloc_entry,
1780 asection *input_section,
1782 char **error_message)
1785 bfd_reloc_status_type flag;
1786 bfd_size_type octets = reloc_entry->address * bfd_octets_per_byte (abfd);
1787 bfd_vma output_base = 0;
1788 reloc_howto_type *howto = reloc_entry->howto;
1789 asection *reloc_target_output_section;
1790 bfd_boolean is_weak_undef;
1792 if (!xtensa_default_isa)
1793 xtensa_default_isa = xtensa_isa_init (0, 0);
1795 /* ELF relocs are against symbols. If we are producing relocatable
1796 output, and the reloc is against an external symbol, the resulting
1797 reloc will also be against the same symbol. In such a case, we
1798 don't want to change anything about the way the reloc is handled,
1799 since it will all be done at final link time. This test is similar
1800 to what bfd_elf_generic_reloc does except that it lets relocs with
1801 howto->partial_inplace go through even if the addend is non-zero.
1802 (The real problem is that partial_inplace is set for XTENSA_32
1803 relocs to begin with, but that's a long story and there's little we
1804 can do about it now....) */
1806 if (output_bfd && (symbol->flags & BSF_SECTION_SYM) == 0)
1808 reloc_entry->address += input_section->output_offset;
1809 return bfd_reloc_ok;
1812 /* Is the address of the relocation really within the section? */
1813 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section))
1814 return bfd_reloc_outofrange;
1816 /* Work out which section the relocation is targeted at and the
1817 initial relocation command value. */
1819 /* Get symbol value. (Common symbols are special.) */
1820 if (bfd_is_com_section (symbol->section))
1823 relocation = symbol->value;
1825 reloc_target_output_section = symbol->section->output_section;
1827 /* Convert input-section-relative symbol value to absolute. */
1828 if ((output_bfd && !howto->partial_inplace)
1829 || reloc_target_output_section == NULL)
1832 output_base = reloc_target_output_section->vma;
1834 relocation += output_base + symbol->section->output_offset;
1836 /* Add in supplied addend. */
1837 relocation += reloc_entry->addend;
1839 /* Here the variable relocation holds the final address of the
1840 symbol we are relocating against, plus any addend. */
1843 if (!howto->partial_inplace)
1845 /* This is a partial relocation, and we want to apply the relocation
1846 to the reloc entry rather than the raw data. Everything except
1847 relocations against section symbols has already been handled
1850 BFD_ASSERT (symbol->flags & BSF_SECTION_SYM);
1851 reloc_entry->addend = relocation;
1852 reloc_entry->address += input_section->output_offset;
1853 return bfd_reloc_ok;
1857 reloc_entry->address += input_section->output_offset;
1858 reloc_entry->addend = 0;
1862 is_weak_undef = (bfd_is_und_section (symbol->section)
1863 && (symbol->flags & BSF_WEAK) != 0);
1864 flag = elf_xtensa_do_reloc (howto, abfd, input_section, relocation,
1865 (bfd_byte *) data, (bfd_vma) octets,
1866 is_weak_undef, error_message);
1868 if (flag == bfd_reloc_dangerous)
1870 /* Add the symbol name to the error message. */
1871 if (! *error_message)
1872 *error_message = "";
1873 *error_message = vsprint_msg (*error_message, ": (%s + 0x%lx)",
1874 strlen (symbol->name) + 17,
1876 (unsigned long) reloc_entry->addend);
1883 /* Set up an entry in the procedure linkage table. */
1886 elf_xtensa_create_plt_entry (struct bfd_link_info *info,
1888 unsigned reloc_index)
1890 asection *splt, *sgotplt;
1891 bfd_vma plt_base, got_base;
1892 bfd_vma code_offset, lit_offset;
1895 chunk = reloc_index / PLT_ENTRIES_PER_CHUNK;
1896 splt = elf_xtensa_get_plt_section (info, chunk);
1897 sgotplt = elf_xtensa_get_gotplt_section (info, chunk);
1898 BFD_ASSERT (splt != NULL && sgotplt != NULL);
1900 plt_base = splt->output_section->vma + splt->output_offset;
1901 got_base = sgotplt->output_section->vma + sgotplt->output_offset;
1903 lit_offset = 8 + (reloc_index % PLT_ENTRIES_PER_CHUNK) * 4;
1904 code_offset = (reloc_index % PLT_ENTRIES_PER_CHUNK) * PLT_ENTRY_SIZE;
1906 /* Fill in the literal entry. This is the offset of the dynamic
1907 relocation entry. */
1908 bfd_put_32 (output_bfd, reloc_index * sizeof (Elf32_External_Rela),
1909 sgotplt->contents + lit_offset);
1911 /* Fill in the entry in the procedure linkage table. */
1912 memcpy (splt->contents + code_offset,
1913 (bfd_big_endian (output_bfd)
1914 ? elf_xtensa_be_plt_entry
1915 : elf_xtensa_le_plt_entry),
1917 bfd_put_16 (output_bfd, l32r_offset (got_base + 0,
1918 plt_base + code_offset + 3),
1919 splt->contents + code_offset + 4);
1920 bfd_put_16 (output_bfd, l32r_offset (got_base + 4,
1921 plt_base + code_offset + 6),
1922 splt->contents + code_offset + 7);
1923 bfd_put_16 (output_bfd, l32r_offset (got_base + lit_offset,
1924 plt_base + code_offset + 9),
1925 splt->contents + code_offset + 10);
1927 return plt_base + code_offset;
1931 /* Relocate an Xtensa ELF section. This is invoked by the linker for
1932 both relocatable and final links. */
1935 elf_xtensa_relocate_section (bfd *output_bfd,
1936 struct bfd_link_info *info,
1938 asection *input_section,
1940 Elf_Internal_Rela *relocs,
1941 Elf_Internal_Sym *local_syms,
1942 asection **local_sections)
1944 struct elf_xtensa_link_hash_table *htab;
1945 Elf_Internal_Shdr *symtab_hdr;
1946 Elf_Internal_Rela *rel;
1947 Elf_Internal_Rela *relend;
1948 struct elf_link_hash_entry **sym_hashes;
1949 property_table_entry *lit_table = 0;
1951 char *error_message = NULL;
1952 bfd_size_type input_size;
1954 if (!xtensa_default_isa)
1955 xtensa_default_isa = xtensa_isa_init (0, 0);
1957 htab = elf_xtensa_hash_table (info);
1958 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1959 sym_hashes = elf_sym_hashes (input_bfd);
1961 if (elf_hash_table (info)->dynamic_sections_created)
1963 ltblsize = xtensa_read_table_entries (input_bfd, input_section,
1964 &lit_table, XTENSA_LIT_SEC_NAME,
1970 input_size = bfd_get_section_limit (input_bfd, input_section);
1973 relend = relocs + input_section->reloc_count;
1974 for (; rel < relend; rel++)
1977 reloc_howto_type *howto;
1978 unsigned long r_symndx;
1979 struct elf_link_hash_entry *h;
1980 Elf_Internal_Sym *sym;
1983 bfd_reloc_status_type r;
1984 bfd_boolean is_weak_undef;
1985 bfd_boolean unresolved_reloc;
1988 r_type = ELF32_R_TYPE (rel->r_info);
1989 if (r_type == (int) R_XTENSA_GNU_VTINHERIT
1990 || r_type == (int) R_XTENSA_GNU_VTENTRY)
1993 if (r_type < 0 || r_type >= (int) R_XTENSA_max)
1995 bfd_set_error (bfd_error_bad_value);
1998 howto = &elf_howto_table[r_type];
2000 r_symndx = ELF32_R_SYM (rel->r_info);
2005 is_weak_undef = FALSE;
2006 unresolved_reloc = FALSE;
2009 if (howto->partial_inplace && !info->relocatable)
2011 /* Because R_XTENSA_32 was made partial_inplace to fix some
2012 problems with DWARF info in partial links, there may be
2013 an addend stored in the contents. Take it out of there
2014 and move it back into the addend field of the reloc. */
2015 rel->r_addend += bfd_get_32 (input_bfd, contents + rel->r_offset);
2016 bfd_put_32 (input_bfd, 0, contents + rel->r_offset);
2019 if (r_symndx < symtab_hdr->sh_info)
2021 sym = local_syms + r_symndx;
2022 sec = local_sections[r_symndx];
2023 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
2027 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2028 r_symndx, symtab_hdr, sym_hashes,
2030 unresolved_reloc, warned);
2033 && !unresolved_reloc
2034 && h->root.type == bfd_link_hash_undefweak)
2035 is_weak_undef = TRUE;
2038 if (sec != NULL && elf_discarded_section (sec))
2040 /* For relocs against symbols from removed linkonce sections,
2041 or sections discarded by a linker script, we just want the
2042 section contents zeroed. Avoid any special processing. */
2043 _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset);
2049 if (info->relocatable)
2051 /* This is a relocatable link.
2052 1) If the reloc is against a section symbol, adjust
2053 according to the output section.
2054 2) If there is a new target for this relocation,
2055 the new target will be in the same output section.
2056 We adjust the relocation by the output section
2059 if (relaxing_section)
2061 /* Check if this references a section in another input file. */
2062 if (!do_fix_for_relocatable_link (rel, input_bfd, input_section,
2067 if (r_type == R_XTENSA_ASM_SIMPLIFY)
2069 char *error_message = NULL;
2070 /* Convert ASM_SIMPLIFY into the simpler relocation
2071 so that they never escape a relaxing link. */
2072 r = contract_asm_expansion (contents, input_size, rel,
2074 if (r != bfd_reloc_ok)
2076 if (!((*info->callbacks->reloc_dangerous)
2077 (info, error_message, input_bfd, input_section,
2081 r_type = ELF32_R_TYPE (rel->r_info);
2084 /* This is a relocatable link, so we don't have to change
2085 anything unless the reloc is against a section symbol,
2086 in which case we have to adjust according to where the
2087 section symbol winds up in the output section. */
2088 if (r_symndx < symtab_hdr->sh_info)
2090 sym = local_syms + r_symndx;
2091 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
2093 sec = local_sections[r_symndx];
2094 rel->r_addend += sec->output_offset + sym->st_value;
2098 /* If there is an addend with a partial_inplace howto,
2099 then move the addend to the contents. This is a hack
2100 to work around problems with DWARF in relocatable links
2101 with some previous version of BFD. Now we can't easily get
2102 rid of the hack without breaking backward compatibility.... */
2105 howto = &elf_howto_table[r_type];
2106 if (howto->partial_inplace)
2108 r = elf_xtensa_do_reloc (howto, input_bfd, input_section,
2109 rel->r_addend, contents,
2110 rel->r_offset, FALSE,
2112 if (r != bfd_reloc_ok)
2114 if (!((*info->callbacks->reloc_dangerous)
2115 (info, error_message, input_bfd, input_section,
2123 /* Done with work for relocatable link; continue with next reloc. */
2127 /* This is a final link. */
2129 if (relaxing_section)
2131 /* Check if this references a section in another input file. */
2132 do_fix_for_final_link (rel, input_bfd, input_section, contents,
2136 /* Sanity check the address. */
2137 if (rel->r_offset >= input_size
2138 && ELF32_R_TYPE (rel->r_info) != R_XTENSA_NONE)
2140 (*_bfd_error_handler)
2141 (_("%B(%A+0x%lx): relocation offset out of range (size=0x%x)"),
2142 input_bfd, input_section, rel->r_offset, input_size);
2143 bfd_set_error (bfd_error_bad_value);
2147 /* Generate dynamic relocations. */
2148 if (elf_hash_table (info)->dynamic_sections_created)
2150 bfd_boolean dynamic_symbol = elf_xtensa_dynamic_symbol_p (h, info);
2152 if (dynamic_symbol && (is_operand_relocation (r_type)
2153 || r_type == R_XTENSA_32_PCREL))
2155 const char *name = h->root.root.string;
2157 vsprint_msg ("invalid relocation for dynamic symbol", ": %s",
2158 strlen (name) + 2, name);
2159 if (!((*info->callbacks->reloc_dangerous)
2160 (info, error_message, input_bfd, input_section,
2164 else if ((r_type == R_XTENSA_32 || r_type == R_XTENSA_PLT)
2165 && (input_section->flags & SEC_ALLOC) != 0
2166 && (dynamic_symbol || info->shared))
2168 Elf_Internal_Rela outrel;
2172 if (dynamic_symbol && r_type == R_XTENSA_PLT)
2173 srel = htab->srelplt;
2175 srel = htab->srelgot;
2177 BFD_ASSERT (srel != NULL);
2180 _bfd_elf_section_offset (output_bfd, info,
2181 input_section, rel->r_offset);
2183 if ((outrel.r_offset | 1) == (bfd_vma) -1)
2184 memset (&outrel, 0, sizeof outrel);
2187 outrel.r_offset += (input_section->output_section->vma
2188 + input_section->output_offset);
2190 /* Complain if the relocation is in a read-only section
2191 and not in a literal pool. */
2192 if ((input_section->flags & SEC_READONLY) != 0
2193 && !elf_xtensa_in_literal_pool (lit_table, ltblsize,
2197 _("dynamic relocation in read-only section");
2198 if (!((*info->callbacks->reloc_dangerous)
2199 (info, error_message, input_bfd, input_section,
2206 outrel.r_addend = rel->r_addend;
2209 if (r_type == R_XTENSA_32)
2212 ELF32_R_INFO (h->dynindx, R_XTENSA_GLOB_DAT);
2215 else /* r_type == R_XTENSA_PLT */
2218 ELF32_R_INFO (h->dynindx, R_XTENSA_JMP_SLOT);
2220 /* Create the PLT entry and set the initial
2221 contents of the literal entry to the address of
2224 elf_xtensa_create_plt_entry (info, output_bfd,
2227 unresolved_reloc = FALSE;
2231 /* Generate a RELATIVE relocation. */
2232 outrel.r_info = ELF32_R_INFO (0, R_XTENSA_RELATIVE);
2233 outrel.r_addend = 0;
2237 loc = (srel->contents
2238 + srel->reloc_count++ * sizeof (Elf32_External_Rela));
2239 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2240 BFD_ASSERT (sizeof (Elf32_External_Rela) * srel->reloc_count
2245 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
2246 because such sections are not SEC_ALLOC and thus ld.so will
2247 not process them. */
2248 if (unresolved_reloc
2249 && !((input_section->flags & SEC_DEBUGGING) != 0
2252 (*_bfd_error_handler)
2253 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
2256 (long) rel->r_offset,
2258 h->root.root.string);
2262 /* There's no point in calling bfd_perform_relocation here.
2263 Just go directly to our "special function". */
2264 r = elf_xtensa_do_reloc (howto, input_bfd, input_section,
2265 relocation + rel->r_addend,
2266 contents, rel->r_offset, is_weak_undef,
2269 if (r != bfd_reloc_ok && !warned)
2273 BFD_ASSERT (r == bfd_reloc_dangerous || r == bfd_reloc_other);
2274 BFD_ASSERT (error_message != NULL);
2277 name = h->root.root.string;
2280 name = bfd_elf_string_from_elf_section
2281 (input_bfd, symtab_hdr->sh_link, sym->st_name);
2282 if (name && *name == '\0')
2283 name = bfd_section_name (input_bfd, sec);
2287 if (rel->r_addend == 0)
2288 error_message = vsprint_msg (error_message, ": %s",
2289 strlen (name) + 2, name);
2291 error_message = vsprint_msg (error_message, ": (%s+0x%x)",
2293 name, (int)rel->r_addend);
2296 if (!((*info->callbacks->reloc_dangerous)
2297 (info, error_message, input_bfd, input_section,
2306 input_section->reloc_done = TRUE;
2312 /* Finish up dynamic symbol handling. There's not much to do here since
2313 the PLT and GOT entries are all set up by relocate_section. */
2316 elf_xtensa_finish_dynamic_symbol (bfd *output_bfd ATTRIBUTE_UNUSED,
2317 struct bfd_link_info *info ATTRIBUTE_UNUSED,
2318 struct elf_link_hash_entry *h,
2319 Elf_Internal_Sym *sym)
2321 if (h->needs_plt && !h->def_regular)
2323 /* Mark the symbol as undefined, rather than as defined in
2324 the .plt section. Leave the value alone. */
2325 sym->st_shndx = SHN_UNDEF;
2326 /* If the symbol is weak, we do need to clear the value.
2327 Otherwise, the PLT entry would provide a definition for
2328 the symbol even if the symbol wasn't defined anywhere,
2329 and so the symbol would never be NULL. */
2330 if (!h->ref_regular_nonweak)
2334 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
2335 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
2336 || h == elf_hash_table (info)->hgot)
2337 sym->st_shndx = SHN_ABS;
2343 /* Combine adjacent literal table entries in the output. Adjacent
2344 entries within each input section may have been removed during
2345 relaxation, but we repeat the process here, even though it's too late
2346 to shrink the output section, because it's important to minimize the
2347 number of literal table entries to reduce the start-up work for the
2348 runtime linker. Returns the number of remaining table entries or -1
2352 elf_xtensa_combine_prop_entries (bfd *output_bfd,
2357 property_table_entry *table;
2358 bfd_size_type section_size, sgotloc_size;
2362 section_size = sxtlit->size;
2363 BFD_ASSERT (section_size % 8 == 0);
2364 num = section_size / 8;
2366 sgotloc_size = sgotloc->size;
2367 if (sgotloc_size != section_size)
2369 (*_bfd_error_handler)
2370 (_("internal inconsistency in size of .got.loc section"));
2374 table = bfd_malloc (num * sizeof (property_table_entry));
2378 /* The ".xt.lit.plt" section has the SEC_IN_MEMORY flag set and this
2379 propagates to the output section, where it doesn't really apply and
2380 where it breaks the following call to bfd_malloc_and_get_section. */
2381 sxtlit->flags &= ~SEC_IN_MEMORY;
2383 if (!bfd_malloc_and_get_section (output_bfd, sxtlit, &contents))
2391 /* There should never be any relocations left at this point, so this
2392 is quite a bit easier than what is done during relaxation. */
2394 /* Copy the raw contents into a property table array and sort it. */
2396 for (n = 0; n < num; n++)
2398 table[n].address = bfd_get_32 (output_bfd, &contents[offset]);
2399 table[n].size = bfd_get_32 (output_bfd, &contents[offset + 4]);
2402 qsort (table, num, sizeof (property_table_entry), property_table_compare);
2404 for (n = 0; n < num; n++)
2406 bfd_boolean remove = FALSE;
2408 if (table[n].size == 0)
2411 (table[n-1].address + table[n-1].size == table[n].address))
2413 table[n-1].size += table[n].size;
2419 for (m = n; m < num - 1; m++)
2421 table[m].address = table[m+1].address;
2422 table[m].size = table[m+1].size;
2430 /* Copy the data back to the raw contents. */
2432 for (n = 0; n < num; n++)
2434 bfd_put_32 (output_bfd, table[n].address, &contents[offset]);
2435 bfd_put_32 (output_bfd, table[n].size, &contents[offset + 4]);
2439 /* Clear the removed bytes. */
2440 if ((bfd_size_type) (num * 8) < section_size)
2441 memset (&contents[num * 8], 0, section_size - num * 8);
2443 if (! bfd_set_section_contents (output_bfd, sxtlit, contents, 0,
2447 /* Copy the contents to ".got.loc". */
2448 memcpy (sgotloc->contents, contents, section_size);
2456 /* Finish up the dynamic sections. */
2459 elf_xtensa_finish_dynamic_sections (bfd *output_bfd,
2460 struct bfd_link_info *info)
2462 struct elf_xtensa_link_hash_table *htab;
2464 asection *sdyn, *srelplt, *sgot, *sxtlit, *sgotloc;
2465 Elf32_External_Dyn *dyncon, *dynconend;
2466 int num_xtlit_entries;
2468 if (! elf_hash_table (info)->dynamic_sections_created)
2471 htab = elf_xtensa_hash_table (info);
2472 dynobj = elf_hash_table (info)->dynobj;
2473 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
2474 BFD_ASSERT (sdyn != NULL);
2476 /* Set the first entry in the global offset table to the address of
2477 the dynamic section. */
2481 BFD_ASSERT (sgot->size == 4);
2483 bfd_put_32 (output_bfd, 0, sgot->contents);
2485 bfd_put_32 (output_bfd,
2486 sdyn->output_section->vma + sdyn->output_offset,
2490 srelplt = htab->srelplt;
2491 if (srelplt && srelplt->size != 0)
2493 asection *sgotplt, *srelgot, *spltlittbl;
2494 int chunk, plt_chunks, plt_entries;
2495 Elf_Internal_Rela irela;
2497 unsigned rtld_reloc;
2499 srelgot = htab->srelgot;
2500 spltlittbl = htab->spltlittbl;
2501 BFD_ASSERT (srelgot != NULL && spltlittbl != NULL);
2503 /* Find the first XTENSA_RTLD relocation. Presumably the rest
2504 of them follow immediately after.... */
2505 for (rtld_reloc = 0; rtld_reloc < srelgot->reloc_count; rtld_reloc++)
2507 loc = srelgot->contents + rtld_reloc * sizeof (Elf32_External_Rela);
2508 bfd_elf32_swap_reloca_in (output_bfd, loc, &irela);
2509 if (ELF32_R_TYPE (irela.r_info) == R_XTENSA_RTLD)
2512 BFD_ASSERT (rtld_reloc < srelgot->reloc_count);
2514 plt_entries = srelplt->size / sizeof (Elf32_External_Rela);
2516 (plt_entries + PLT_ENTRIES_PER_CHUNK - 1) / PLT_ENTRIES_PER_CHUNK;
2518 for (chunk = 0; chunk < plt_chunks; chunk++)
2520 int chunk_entries = 0;
2522 sgotplt = elf_xtensa_get_gotplt_section (info, chunk);
2523 BFD_ASSERT (sgotplt != NULL);
2525 /* Emit special RTLD relocations for the first two entries in
2526 each chunk of the .got.plt section. */
2528 loc = srelgot->contents + rtld_reloc * sizeof (Elf32_External_Rela);
2529 bfd_elf32_swap_reloca_in (output_bfd, loc, &irela);
2530 BFD_ASSERT (ELF32_R_TYPE (irela.r_info) == R_XTENSA_RTLD);
2531 irela.r_offset = (sgotplt->output_section->vma
2532 + sgotplt->output_offset);
2533 irela.r_addend = 1; /* tell rtld to set value to resolver function */
2534 bfd_elf32_swap_reloca_out (output_bfd, &irela, loc);
2536 BFD_ASSERT (rtld_reloc <= srelgot->reloc_count);
2538 /* Next literal immediately follows the first. */
2539 loc += sizeof (Elf32_External_Rela);
2540 bfd_elf32_swap_reloca_in (output_bfd, loc, &irela);
2541 BFD_ASSERT (ELF32_R_TYPE (irela.r_info) == R_XTENSA_RTLD);
2542 irela.r_offset = (sgotplt->output_section->vma
2543 + sgotplt->output_offset + 4);
2544 /* Tell rtld to set value to object's link map. */
2546 bfd_elf32_swap_reloca_out (output_bfd, &irela, loc);
2548 BFD_ASSERT (rtld_reloc <= srelgot->reloc_count);
2550 /* Fill in the literal table. */
2551 if (chunk < plt_chunks - 1)
2552 chunk_entries = PLT_ENTRIES_PER_CHUNK;
2554 chunk_entries = plt_entries - (chunk * PLT_ENTRIES_PER_CHUNK);
2556 BFD_ASSERT ((unsigned) (chunk + 1) * 8 <= spltlittbl->size);
2557 bfd_put_32 (output_bfd,
2558 sgotplt->output_section->vma + sgotplt->output_offset,
2559 spltlittbl->contents + (chunk * 8) + 0);
2560 bfd_put_32 (output_bfd,
2561 8 + (chunk_entries * 4),
2562 spltlittbl->contents + (chunk * 8) + 4);
2565 /* All the dynamic relocations have been emitted at this point.
2566 Make sure the relocation sections are the correct size. */
2567 if (srelgot->size != (sizeof (Elf32_External_Rela)
2568 * srelgot->reloc_count)
2569 || srelplt->size != (sizeof (Elf32_External_Rela)
2570 * srelplt->reloc_count))
2573 /* The .xt.lit.plt section has just been modified. This must
2574 happen before the code below which combines adjacent literal
2575 table entries, and the .xt.lit.plt contents have to be forced to
2577 if (! bfd_set_section_contents (output_bfd,
2578 spltlittbl->output_section,
2579 spltlittbl->contents,
2580 spltlittbl->output_offset,
2583 /* Clear SEC_HAS_CONTENTS so the contents won't be output again. */
2584 spltlittbl->flags &= ~SEC_HAS_CONTENTS;
2587 /* Combine adjacent literal table entries. */
2588 BFD_ASSERT (! info->relocatable);
2589 sxtlit = bfd_get_section_by_name (output_bfd, ".xt.lit");
2590 sgotloc = htab->sgotloc;
2591 BFD_ASSERT (sxtlit && sgotloc);
2593 elf_xtensa_combine_prop_entries (output_bfd, sxtlit, sgotloc);
2594 if (num_xtlit_entries < 0)
2597 dyncon = (Elf32_External_Dyn *) sdyn->contents;
2598 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
2599 for (; dyncon < dynconend; dyncon++)
2601 Elf_Internal_Dyn dyn;
2603 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
2610 case DT_XTENSA_GOT_LOC_SZ:
2611 dyn.d_un.d_val = num_xtlit_entries;
2614 case DT_XTENSA_GOT_LOC_OFF:
2615 dyn.d_un.d_ptr = htab->sgotloc->output_section->vma;
2619 dyn.d_un.d_ptr = htab->sgot->output_section->vma;
2623 dyn.d_un.d_ptr = htab->srelplt->output_section->vma;
2627 dyn.d_un.d_val = htab->srelplt->output_section->size;
2631 /* Adjust RELASZ to not include JMPREL. This matches what
2632 glibc expects and what is done for several other ELF
2633 targets (e.g., i386, alpha), but the "correct" behavior
2634 seems to be unresolved. Since the linker script arranges
2635 for .rela.plt to follow all other relocation sections, we
2636 don't have to worry about changing the DT_RELA entry. */
2638 dyn.d_un.d_val -= htab->srelplt->output_section->size;
2642 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2649 /* Functions for dealing with the e_flags field. */
2651 /* Merge backend specific data from an object file to the output
2652 object file when linking. */
2655 elf_xtensa_merge_private_bfd_data (bfd *ibfd, bfd *obfd)
2657 unsigned out_mach, in_mach;
2658 flagword out_flag, in_flag;
2660 /* Check if we have the same endianess. */
2661 if (!_bfd_generic_verify_endian_match (ibfd, obfd))
2664 /* Don't even pretend to support mixed-format linking. */
2665 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
2666 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
2669 out_flag = elf_elfheader (obfd)->e_flags;
2670 in_flag = elf_elfheader (ibfd)->e_flags;
2672 out_mach = out_flag & EF_XTENSA_MACH;
2673 in_mach = in_flag & EF_XTENSA_MACH;
2674 if (out_mach != in_mach)
2676 (*_bfd_error_handler)
2677 (_("%B: incompatible machine type. Output is 0x%x. Input is 0x%x"),
2678 ibfd, out_mach, in_mach);
2679 bfd_set_error (bfd_error_wrong_format);
2683 if (! elf_flags_init (obfd))
2685 elf_flags_init (obfd) = TRUE;
2686 elf_elfheader (obfd)->e_flags = in_flag;
2688 if (bfd_get_arch (obfd) == bfd_get_arch (ibfd)
2689 && bfd_get_arch_info (obfd)->the_default)
2690 return bfd_set_arch_mach (obfd, bfd_get_arch (ibfd),
2691 bfd_get_mach (ibfd));
2696 if ((out_flag & EF_XTENSA_XT_INSN) != (in_flag & EF_XTENSA_XT_INSN))
2697 elf_elfheader (obfd)->e_flags &= (~ EF_XTENSA_XT_INSN);
2699 if ((out_flag & EF_XTENSA_XT_LIT) != (in_flag & EF_XTENSA_XT_LIT))
2700 elf_elfheader (obfd)->e_flags &= (~ EF_XTENSA_XT_LIT);
2707 elf_xtensa_set_private_flags (bfd *abfd, flagword flags)
2709 BFD_ASSERT (!elf_flags_init (abfd)
2710 || elf_elfheader (abfd)->e_flags == flags);
2712 elf_elfheader (abfd)->e_flags |= flags;
2713 elf_flags_init (abfd) = TRUE;
2720 elf_xtensa_print_private_bfd_data (bfd *abfd, void *farg)
2722 FILE *f = (FILE *) farg;
2723 flagword e_flags = elf_elfheader (abfd)->e_flags;
2725 fprintf (f, "\nXtensa header:\n");
2726 if ((e_flags & EF_XTENSA_MACH) == E_XTENSA_MACH)
2727 fprintf (f, "\nMachine = Base\n");
2729 fprintf (f, "\nMachine Id = 0x%x\n", e_flags & EF_XTENSA_MACH);
2731 fprintf (f, "Insn tables = %s\n",
2732 (e_flags & EF_XTENSA_XT_INSN) ? "true" : "false");
2734 fprintf (f, "Literal tables = %s\n",
2735 (e_flags & EF_XTENSA_XT_LIT) ? "true" : "false");
2737 return _bfd_elf_print_private_bfd_data (abfd, farg);
2741 /* Set the right machine number for an Xtensa ELF file. */
2744 elf_xtensa_object_p (bfd *abfd)
2747 unsigned long arch = elf_elfheader (abfd)->e_flags & EF_XTENSA_MACH;
2752 mach = bfd_mach_xtensa;
2758 (void) bfd_default_set_arch_mach (abfd, bfd_arch_xtensa, mach);
2763 /* The final processing done just before writing out an Xtensa ELF object
2764 file. This gets the Xtensa architecture right based on the machine
2768 elf_xtensa_final_write_processing (bfd *abfd,
2769 bfd_boolean linker ATTRIBUTE_UNUSED)
2774 switch (mach = bfd_get_mach (abfd))
2776 case bfd_mach_xtensa:
2777 val = E_XTENSA_MACH;
2783 elf_elfheader (abfd)->e_flags &= (~ EF_XTENSA_MACH);
2784 elf_elfheader (abfd)->e_flags |= val;
2788 static enum elf_reloc_type_class
2789 elf_xtensa_reloc_type_class (const Elf_Internal_Rela *rela)
2791 switch ((int) ELF32_R_TYPE (rela->r_info))
2793 case R_XTENSA_RELATIVE:
2794 return reloc_class_relative;
2795 case R_XTENSA_JMP_SLOT:
2796 return reloc_class_plt;
2798 return reloc_class_normal;
2804 elf_xtensa_discard_info_for_section (bfd *abfd,
2805 struct elf_reloc_cookie *cookie,
2806 struct bfd_link_info *info,
2810 bfd_vma offset, actual_offset;
2811 bfd_size_type removed_bytes = 0;
2812 bfd_size_type entry_size;
2814 if (sec->output_section
2815 && bfd_is_abs_section (sec->output_section))
2818 if (xtensa_is_proptable_section (sec))
2823 if (sec->size == 0 || sec->size % entry_size != 0)
2826 contents = retrieve_contents (abfd, sec, info->keep_memory);
2830 cookie->rels = retrieve_internal_relocs (abfd, sec, info->keep_memory);
2833 release_contents (sec, contents);
2837 /* Sort the relocations. They should already be in order when
2838 relaxation is enabled, but it might not be. */
2839 qsort (cookie->rels, sec->reloc_count, sizeof (Elf_Internal_Rela),
2840 internal_reloc_compare);
2842 cookie->rel = cookie->rels;
2843 cookie->relend = cookie->rels + sec->reloc_count;
2845 for (offset = 0; offset < sec->size; offset += entry_size)
2847 actual_offset = offset - removed_bytes;
2849 /* The ...symbol_deleted_p function will skip over relocs but it
2850 won't adjust their offsets, so do that here. */
2851 while (cookie->rel < cookie->relend
2852 && cookie->rel->r_offset < offset)
2854 cookie->rel->r_offset -= removed_bytes;
2858 while (cookie->rel < cookie->relend
2859 && cookie->rel->r_offset == offset)
2861 if (bfd_elf_reloc_symbol_deleted_p (offset, cookie))
2863 /* Remove the table entry. (If the reloc type is NONE, then
2864 the entry has already been merged with another and deleted
2865 during relaxation.) */
2866 if (ELF32_R_TYPE (cookie->rel->r_info) != R_XTENSA_NONE)
2868 /* Shift the contents up. */
2869 if (offset + entry_size < sec->size)
2870 memmove (&contents[actual_offset],
2871 &contents[actual_offset + entry_size],
2872 sec->size - offset - entry_size);
2873 removed_bytes += entry_size;
2876 /* Remove this relocation. */
2877 cookie->rel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
2880 /* Adjust the relocation offset for previous removals. This
2881 should not be done before calling ...symbol_deleted_p
2882 because it might mess up the offset comparisons there.
2883 Make sure the offset doesn't underflow in the case where
2884 the first entry is removed. */
2885 if (cookie->rel->r_offset >= removed_bytes)
2886 cookie->rel->r_offset -= removed_bytes;
2888 cookie->rel->r_offset = 0;
2894 if (removed_bytes != 0)
2896 /* Adjust any remaining relocs (shouldn't be any). */
2897 for (; cookie->rel < cookie->relend; cookie->rel++)
2899 if (cookie->rel->r_offset >= removed_bytes)
2900 cookie->rel->r_offset -= removed_bytes;
2902 cookie->rel->r_offset = 0;
2905 /* Clear the removed bytes. */
2906 memset (&contents[sec->size - removed_bytes], 0, removed_bytes);
2908 pin_contents (sec, contents);
2909 pin_internal_relocs (sec, cookie->rels);
2912 if (sec->rawsize == 0)
2913 sec->rawsize = sec->size;
2914 sec->size -= removed_bytes;
2916 if (xtensa_is_littable_section (sec))
2918 asection *sgotloc = elf_xtensa_hash_table (info)->sgotloc;
2920 sgotloc->size -= removed_bytes;
2925 release_contents (sec, contents);
2926 release_internal_relocs (sec, cookie->rels);
2929 return (removed_bytes != 0);
2934 elf_xtensa_discard_info (bfd *abfd,
2935 struct elf_reloc_cookie *cookie,
2936 struct bfd_link_info *info)
2939 bfd_boolean changed = FALSE;
2941 for (sec = abfd->sections; sec != NULL; sec = sec->next)
2943 if (xtensa_is_property_section (sec))
2945 if (elf_xtensa_discard_info_for_section (abfd, cookie, info, sec))
2955 elf_xtensa_ignore_discarded_relocs (asection *sec)
2957 return xtensa_is_property_section (sec);
2962 elf_xtensa_action_discarded (asection *sec)
2964 if (strcmp (".xt_except_table", sec->name) == 0)
2967 if (strcmp (".xt_except_desc", sec->name) == 0)
2970 return _bfd_elf_default_action_discarded (sec);
2974 /* Support for core dump NOTE sections. */
2977 elf_xtensa_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
2982 /* The size for Xtensa is variable, so don't try to recognize the format
2983 based on the size. Just assume this is GNU/Linux. */
2986 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12);
2989 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24);
2993 size = note->descsz - offset - 4;
2995 /* Make a ".reg/999" section. */
2996 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
2997 size, note->descpos + offset);
3002 elf_xtensa_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
3004 switch (note->descsz)
3009 case 128: /* GNU/Linux elf_prpsinfo */
3010 elf_tdata (abfd)->core_program
3011 = _bfd_elfcore_strndup (abfd, note->descdata + 32, 16);
3012 elf_tdata (abfd)->core_command
3013 = _bfd_elfcore_strndup (abfd, note->descdata + 48, 80);
3016 /* Note that for some reason, a spurious space is tacked
3017 onto the end of the args in some (at least one anyway)
3018 implementations, so strip it off if it exists. */
3021 char *command = elf_tdata (abfd)->core_command;
3022 int n = strlen (command);
3024 if (0 < n && command[n - 1] == ' ')
3025 command[n - 1] = '\0';
3032 /* Generic Xtensa configurability stuff. */
3034 static xtensa_opcode callx0_op = XTENSA_UNDEFINED;
3035 static xtensa_opcode callx4_op = XTENSA_UNDEFINED;
3036 static xtensa_opcode callx8_op = XTENSA_UNDEFINED;
3037 static xtensa_opcode callx12_op = XTENSA_UNDEFINED;
3038 static xtensa_opcode call0_op = XTENSA_UNDEFINED;
3039 static xtensa_opcode call4_op = XTENSA_UNDEFINED;
3040 static xtensa_opcode call8_op = XTENSA_UNDEFINED;
3041 static xtensa_opcode call12_op = XTENSA_UNDEFINED;
3044 init_call_opcodes (void)
3046 if (callx0_op == XTENSA_UNDEFINED)
3048 callx0_op = xtensa_opcode_lookup (xtensa_default_isa, "callx0");
3049 callx4_op = xtensa_opcode_lookup (xtensa_default_isa, "callx4");
3050 callx8_op = xtensa_opcode_lookup (xtensa_default_isa, "callx8");
3051 callx12_op = xtensa_opcode_lookup (xtensa_default_isa, "callx12");
3052 call0_op = xtensa_opcode_lookup (xtensa_default_isa, "call0");
3053 call4_op = xtensa_opcode_lookup (xtensa_default_isa, "call4");
3054 call8_op = xtensa_opcode_lookup (xtensa_default_isa, "call8");
3055 call12_op = xtensa_opcode_lookup (xtensa_default_isa, "call12");
3061 is_indirect_call_opcode (xtensa_opcode opcode)
3063 init_call_opcodes ();
3064 return (opcode == callx0_op
3065 || opcode == callx4_op
3066 || opcode == callx8_op
3067 || opcode == callx12_op);
3072 is_direct_call_opcode (xtensa_opcode opcode)
3074 init_call_opcodes ();
3075 return (opcode == call0_op
3076 || opcode == call4_op
3077 || opcode == call8_op
3078 || opcode == call12_op);
3083 is_windowed_call_opcode (xtensa_opcode opcode)
3085 init_call_opcodes ();
3086 return (opcode == call4_op
3087 || opcode == call8_op
3088 || opcode == call12_op
3089 || opcode == callx4_op
3090 || opcode == callx8_op
3091 || opcode == callx12_op);
3095 static xtensa_opcode
3096 get_const16_opcode (void)
3098 static bfd_boolean done_lookup = FALSE;
3099 static xtensa_opcode const16_opcode = XTENSA_UNDEFINED;
3102 const16_opcode = xtensa_opcode_lookup (xtensa_default_isa, "const16");
3105 return const16_opcode;
3109 static xtensa_opcode
3110 get_l32r_opcode (void)
3112 static xtensa_opcode l32r_opcode = XTENSA_UNDEFINED;
3113 static bfd_boolean done_lookup = FALSE;
3117 l32r_opcode = xtensa_opcode_lookup (xtensa_default_isa, "l32r");
3125 l32r_offset (bfd_vma addr, bfd_vma pc)
3129 offset = addr - ((pc+3) & -4);
3130 BFD_ASSERT ((offset & ((1 << 2) - 1)) == 0);
3131 offset = (signed int) offset >> 2;
3132 BFD_ASSERT ((signed int) offset >> 16 == -1);
3138 get_relocation_opnd (xtensa_opcode opcode, int r_type)
3140 xtensa_isa isa = xtensa_default_isa;
3141 int last_immed, last_opnd, opi;
3143 if (opcode == XTENSA_UNDEFINED)
3144 return XTENSA_UNDEFINED;
3146 /* Find the last visible PC-relative immediate operand for the opcode.
3147 If there are no PC-relative immediates, then choose the last visible
3148 immediate; otherwise, fail and return XTENSA_UNDEFINED. */
3149 last_immed = XTENSA_UNDEFINED;
3150 last_opnd = xtensa_opcode_num_operands (isa, opcode);
3151 for (opi = last_opnd - 1; opi >= 0; opi--)
3153 if (xtensa_operand_is_visible (isa, opcode, opi) == 0)
3155 if (xtensa_operand_is_PCrelative (isa, opcode, opi) == 1)
3160 if (last_immed == XTENSA_UNDEFINED
3161 && xtensa_operand_is_register (isa, opcode, opi) == 0)
3165 return XTENSA_UNDEFINED;
3167 /* If the operand number was specified in an old-style relocation,
3168 check for consistency with the operand computed above. */
3169 if (r_type >= R_XTENSA_OP0 && r_type <= R_XTENSA_OP2)
3171 int reloc_opnd = r_type - R_XTENSA_OP0;
3172 if (reloc_opnd != last_immed)
3173 return XTENSA_UNDEFINED;
3181 get_relocation_slot (int r_type)
3191 if (r_type >= R_XTENSA_SLOT0_OP && r_type <= R_XTENSA_SLOT14_OP)
3192 return r_type - R_XTENSA_SLOT0_OP;
3193 if (r_type >= R_XTENSA_SLOT0_ALT && r_type <= R_XTENSA_SLOT14_ALT)
3194 return r_type - R_XTENSA_SLOT0_ALT;
3198 return XTENSA_UNDEFINED;
3202 /* Get the opcode for a relocation. */
3204 static xtensa_opcode
3205 get_relocation_opcode (bfd *abfd,
3208 Elf_Internal_Rela *irel)
3210 static xtensa_insnbuf ibuff = NULL;
3211 static xtensa_insnbuf sbuff = NULL;
3212 xtensa_isa isa = xtensa_default_isa;
3216 if (contents == NULL)
3217 return XTENSA_UNDEFINED;
3219 if (bfd_get_section_limit (abfd, sec) <= irel->r_offset)
3220 return XTENSA_UNDEFINED;
3224 ibuff = xtensa_insnbuf_alloc (isa);
3225 sbuff = xtensa_insnbuf_alloc (isa);
3228 /* Decode the instruction. */
3229 xtensa_insnbuf_from_chars (isa, ibuff, &contents[irel->r_offset],
3230 sec->size - irel->r_offset);
3231 fmt = xtensa_format_decode (isa, ibuff);
3232 slot = get_relocation_slot (ELF32_R_TYPE (irel->r_info));
3233 if (slot == XTENSA_UNDEFINED)
3234 return XTENSA_UNDEFINED;
3235 xtensa_format_get_slot (isa, fmt, slot, ibuff, sbuff);
3236 return xtensa_opcode_decode (isa, fmt, slot, sbuff);
3241 is_l32r_relocation (bfd *abfd,
3244 Elf_Internal_Rela *irel)
3246 xtensa_opcode opcode;
3247 if (!is_operand_relocation (ELF32_R_TYPE (irel->r_info)))
3249 opcode = get_relocation_opcode (abfd, sec, contents, irel);
3250 return (opcode == get_l32r_opcode ());
3254 static bfd_size_type
3255 get_asm_simplify_size (bfd_byte *contents,
3256 bfd_size_type content_len,
3257 bfd_size_type offset)
3259 bfd_size_type insnlen, size = 0;
3261 /* Decode the size of the next two instructions. */
3262 insnlen = insn_decode_len (contents, content_len, offset);
3268 insnlen = insn_decode_len (contents, content_len, offset + size);
3278 is_alt_relocation (int r_type)
3280 return (r_type >= R_XTENSA_SLOT0_ALT
3281 && r_type <= R_XTENSA_SLOT14_ALT);
3286 is_operand_relocation (int r_type)
3296 if (r_type >= R_XTENSA_SLOT0_OP && r_type <= R_XTENSA_SLOT14_OP)
3298 if (r_type >= R_XTENSA_SLOT0_ALT && r_type <= R_XTENSA_SLOT14_ALT)
3307 #define MIN_INSN_LENGTH 2
3309 /* Return 0 if it fails to decode. */
3312 insn_decode_len (bfd_byte *contents,
3313 bfd_size_type content_len,
3314 bfd_size_type offset)
3317 xtensa_isa isa = xtensa_default_isa;
3319 static xtensa_insnbuf ibuff = NULL;
3321 if (offset + MIN_INSN_LENGTH > content_len)
3325 ibuff = xtensa_insnbuf_alloc (isa);
3326 xtensa_insnbuf_from_chars (isa, ibuff, &contents[offset],
3327 content_len - offset);
3328 fmt = xtensa_format_decode (isa, ibuff);
3329 if (fmt == XTENSA_UNDEFINED)
3331 insn_len = xtensa_format_length (isa, fmt);
3332 if (insn_len == XTENSA_UNDEFINED)
3338 /* Decode the opcode for a single slot instruction.
3339 Return 0 if it fails to decode or the instruction is multi-slot. */
3342 insn_decode_opcode (bfd_byte *contents,
3343 bfd_size_type content_len,
3344 bfd_size_type offset,
3347 xtensa_isa isa = xtensa_default_isa;
3349 static xtensa_insnbuf insnbuf = NULL;
3350 static xtensa_insnbuf slotbuf = NULL;
3352 if (offset + MIN_INSN_LENGTH > content_len)
3353 return XTENSA_UNDEFINED;
3355 if (insnbuf == NULL)
3357 insnbuf = xtensa_insnbuf_alloc (isa);
3358 slotbuf = xtensa_insnbuf_alloc (isa);
3361 xtensa_insnbuf_from_chars (isa, insnbuf, &contents[offset],
3362 content_len - offset);
3363 fmt = xtensa_format_decode (isa, insnbuf);
3364 if (fmt == XTENSA_UNDEFINED)
3365 return XTENSA_UNDEFINED;
3367 if (slot >= xtensa_format_num_slots (isa, fmt))
3368 return XTENSA_UNDEFINED;
3370 xtensa_format_get_slot (isa, fmt, slot, insnbuf, slotbuf);
3371 return xtensa_opcode_decode (isa, fmt, slot, slotbuf);
3375 /* The offset is the offset in the contents.
3376 The address is the address of that offset. */
3379 check_branch_target_aligned (bfd_byte *contents,
3380 bfd_size_type content_length,
3384 bfd_size_type insn_len = insn_decode_len (contents, content_length, offset);
3387 return check_branch_target_aligned_address (address, insn_len);
3392 check_loop_aligned (bfd_byte *contents,
3393 bfd_size_type content_length,
3397 bfd_size_type loop_len, insn_len;
3398 xtensa_opcode opcode;
3400 opcode = insn_decode_opcode (contents, content_length, offset, 0);
3401 if (opcode == XTENSA_UNDEFINED
3402 || xtensa_opcode_is_loop (xtensa_default_isa, opcode) != 1)
3408 loop_len = insn_decode_len (contents, content_length, offset);
3409 insn_len = insn_decode_len (contents, content_length, offset + loop_len);
3410 if (loop_len == 0 || insn_len == 0)
3416 return check_branch_target_aligned_address (address + loop_len, insn_len);
3421 check_branch_target_aligned_address (bfd_vma addr, int len)
3424 return (addr % 8 == 0);
3425 return ((addr >> 2) == ((addr + len - 1) >> 2));
3429 /* Instruction widening and narrowing. */
3431 /* When FLIX is available we need to access certain instructions only
3432 when they are 16-bit or 24-bit instructions. This table caches
3433 information about such instructions by walking through all the
3434 opcodes and finding the smallest single-slot format into which each
3437 static xtensa_format *op_single_fmt_table = NULL;
3441 init_op_single_format_table (void)
3443 xtensa_isa isa = xtensa_default_isa;
3444 xtensa_insnbuf ibuf;
3445 xtensa_opcode opcode;
3449 if (op_single_fmt_table)
3452 ibuf = xtensa_insnbuf_alloc (isa);
3453 num_opcodes = xtensa_isa_num_opcodes (isa);
3455 op_single_fmt_table = (xtensa_format *)
3456 bfd_malloc (sizeof (xtensa_format) * num_opcodes);
3457 for (opcode = 0; opcode < num_opcodes; opcode++)
3459 op_single_fmt_table[opcode] = XTENSA_UNDEFINED;
3460 for (fmt = 0; fmt < xtensa_isa_num_formats (isa); fmt++)
3462 if (xtensa_format_num_slots (isa, fmt) == 1
3463 && xtensa_opcode_encode (isa, fmt, 0, ibuf, opcode) == 0)
3465 xtensa_opcode old_fmt = op_single_fmt_table[opcode];
3466 int fmt_length = xtensa_format_length (isa, fmt);
3467 if (old_fmt == XTENSA_UNDEFINED
3468 || fmt_length < xtensa_format_length (isa, old_fmt))
3469 op_single_fmt_table[opcode] = fmt;
3473 xtensa_insnbuf_free (isa, ibuf);
3477 static xtensa_format
3478 get_single_format (xtensa_opcode opcode)
3480 init_op_single_format_table ();
3481 return op_single_fmt_table[opcode];
3485 /* For the set of narrowable instructions we do NOT include the
3486 narrowings beqz -> beqz.n or bnez -> bnez.n because of complexities
3487 involved during linker relaxation that may require these to
3488 re-expand in some conditions. Also, the narrowing "or" -> mov.n
3489 requires special case code to ensure it only works when op1 == op2. */
3497 struct string_pair narrowable[] =
3500 { "addi", "addi.n" },
3501 { "addmi", "addi.n" },
3502 { "l32i", "l32i.n" },
3503 { "movi", "movi.n" },
3505 { "retw", "retw.n" },
3506 { "s32i", "s32i.n" },
3507 { "or", "mov.n" } /* special case only when op1 == op2 */
3510 struct string_pair widenable[] =
3513 { "addi", "addi.n" },
3514 { "addmi", "addi.n" },
3515 { "beqz", "beqz.n" },
3516 { "bnez", "bnez.n" },
3517 { "l32i", "l32i.n" },
3518 { "movi", "movi.n" },
3520 { "retw", "retw.n" },
3521 { "s32i", "s32i.n" },
3522 { "or", "mov.n" } /* special case only when op1 == op2 */
3526 /* Check if an instruction can be "narrowed", i.e., changed from a standard
3527 3-byte instruction to a 2-byte "density" instruction. If it is valid,
3528 return the instruction buffer holding the narrow instruction. Otherwise,
3529 return 0. The set of valid narrowing are specified by a string table
3530 but require some special case operand checks in some cases. */
3532 static xtensa_insnbuf
3533 can_narrow_instruction (xtensa_insnbuf slotbuf,
3535 xtensa_opcode opcode)
3537 xtensa_isa isa = xtensa_default_isa;
3538 xtensa_format o_fmt;
3541 static xtensa_insnbuf o_insnbuf = NULL;
3542 static xtensa_insnbuf o_slotbuf = NULL;
3544 if (o_insnbuf == NULL)
3546 o_insnbuf = xtensa_insnbuf_alloc (isa);
3547 o_slotbuf = xtensa_insnbuf_alloc (isa);
3550 for (opi = 0; opi < (sizeof (narrowable)/sizeof (struct string_pair)); opi++)
3552 bfd_boolean is_or = (strcmp ("or", narrowable[opi].wide) == 0);
3554 if (opcode == xtensa_opcode_lookup (isa, narrowable[opi].wide))
3556 uint32 value, newval;
3557 int i, operand_count, o_operand_count;
3558 xtensa_opcode o_opcode;
3560 /* Address does not matter in this case. We might need to
3561 fix it to handle branches/jumps. */
3562 bfd_vma self_address = 0;
3564 o_opcode = xtensa_opcode_lookup (isa, narrowable[opi].narrow);
3565 if (o_opcode == XTENSA_UNDEFINED)
3567 o_fmt = get_single_format (o_opcode);
3568 if (o_fmt == XTENSA_UNDEFINED)
3571 if (xtensa_format_length (isa, fmt) != 3
3572 || xtensa_format_length (isa, o_fmt) != 2)
3575 xtensa_format_encode (isa, o_fmt, o_insnbuf);
3576 operand_count = xtensa_opcode_num_operands (isa, opcode);
3577 o_operand_count = xtensa_opcode_num_operands (isa, o_opcode);
3579 if (xtensa_opcode_encode (isa, o_fmt, 0, o_slotbuf, o_opcode) != 0)
3584 if (xtensa_opcode_num_operands (isa, o_opcode) != operand_count)
3589 uint32 rawval0, rawval1, rawval2;
3591 if (o_operand_count + 1 != operand_count
3592 || xtensa_operand_get_field (isa, opcode, 0,
3593 fmt, 0, slotbuf, &rawval0) != 0
3594 || xtensa_operand_get_field (isa, opcode, 1,
3595 fmt, 0, slotbuf, &rawval1) != 0
3596 || xtensa_operand_get_field (isa, opcode, 2,
3597 fmt, 0, slotbuf, &rawval2) != 0
3598 || rawval1 != rawval2
3599 || rawval0 == rawval1 /* it is a nop */)
3603 for (i = 0; i < o_operand_count; ++i)
3605 if (xtensa_operand_get_field (isa, opcode, i, fmt, 0,
3607 || xtensa_operand_decode (isa, opcode, i, &value))
3610 /* PC-relative branches need adjustment, but
3611 the PC-rel operand will always have a relocation. */
3613 if (xtensa_operand_do_reloc (isa, o_opcode, i, &newval,
3615 || xtensa_operand_encode (isa, o_opcode, i, &newval)
3616 || xtensa_operand_set_field (isa, o_opcode, i, o_fmt, 0,
3621 if (xtensa_format_set_slot (isa, o_fmt, 0, o_insnbuf, o_slotbuf))
3631 /* Attempt to narrow an instruction. If the narrowing is valid, perform
3632 the action in-place directly into the contents and return TRUE. Otherwise,
3633 the return value is FALSE and the contents are not modified. */
3636 narrow_instruction (bfd_byte *contents,
3637 bfd_size_type content_length,
3638 bfd_size_type offset)
3640 xtensa_opcode opcode;
3641 bfd_size_type insn_len;
3642 xtensa_isa isa = xtensa_default_isa;
3644 xtensa_insnbuf o_insnbuf;
3646 static xtensa_insnbuf insnbuf = NULL;
3647 static xtensa_insnbuf slotbuf = NULL;
3649 if (insnbuf == NULL)
3651 insnbuf = xtensa_insnbuf_alloc (isa);
3652 slotbuf = xtensa_insnbuf_alloc (isa);
3655 BFD_ASSERT (offset < content_length);
3657 if (content_length < 2)
3660 /* We will hand-code a few of these for a little while.
3661 These have all been specified in the assembler aleady. */
3662 xtensa_insnbuf_from_chars (isa, insnbuf, &contents[offset],
3663 content_length - offset);
3664 fmt = xtensa_format_decode (isa, insnbuf);
3665 if (xtensa_format_num_slots (isa, fmt) != 1)
3668 if (xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf) != 0)
3671 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
3672 if (opcode == XTENSA_UNDEFINED)
3674 insn_len = xtensa_format_length (isa, fmt);
3675 if (insn_len > content_length)
3678 o_insnbuf = can_narrow_instruction (slotbuf, fmt, opcode);
3681 xtensa_insnbuf_to_chars (isa, o_insnbuf, contents + offset,
3682 content_length - offset);
3690 /* Check if an instruction can be "widened", i.e., changed from a 2-byte
3691 "density" instruction to a standard 3-byte instruction. If it is valid,
3692 return the instruction buffer holding the wide instruction. Otherwise,
3693 return 0. The set of valid widenings are specified by a string table
3694 but require some special case operand checks in some cases. */
3696 static xtensa_insnbuf
3697 can_widen_instruction (xtensa_insnbuf slotbuf,
3699 xtensa_opcode opcode)
3701 xtensa_isa isa = xtensa_default_isa;
3702 xtensa_format o_fmt;
3705 static xtensa_insnbuf o_insnbuf = NULL;
3706 static xtensa_insnbuf o_slotbuf = NULL;
3708 if (o_insnbuf == NULL)
3710 o_insnbuf = xtensa_insnbuf_alloc (isa);
3711 o_slotbuf = xtensa_insnbuf_alloc (isa);
3714 for (opi = 0; opi < (sizeof (widenable)/sizeof (struct string_pair)); opi++)
3716 bfd_boolean is_or = (strcmp ("or", widenable[opi].wide) == 0);
3717 bfd_boolean is_branch = (strcmp ("beqz", widenable[opi].wide) == 0
3718 || strcmp ("bnez", widenable[opi].wide) == 0);
3720 if (opcode == xtensa_opcode_lookup (isa, widenable[opi].narrow))
3722 uint32 value, newval;
3723 int i, operand_count, o_operand_count, check_operand_count;
3724 xtensa_opcode o_opcode;
3726 /* Address does not matter in this case. We might need to fix it
3727 to handle branches/jumps. */
3728 bfd_vma self_address = 0;
3730 o_opcode = xtensa_opcode_lookup (isa, widenable[opi].wide);
3731 if (o_opcode == XTENSA_UNDEFINED)
3733 o_fmt = get_single_format (o_opcode);
3734 if (o_fmt == XTENSA_UNDEFINED)
3737 if (xtensa_format_length (isa, fmt) != 2
3738 || xtensa_format_length (isa, o_fmt) != 3)
3741 xtensa_format_encode (isa, o_fmt, o_insnbuf);
3742 operand_count = xtensa_opcode_num_operands (isa, opcode);
3743 o_operand_count = xtensa_opcode_num_operands (isa, o_opcode);
3744 check_operand_count = o_operand_count;
3746 if (xtensa_opcode_encode (isa, o_fmt, 0, o_slotbuf, o_opcode) != 0)
3751 if (xtensa_opcode_num_operands (isa, o_opcode) != operand_count)
3756 uint32 rawval0, rawval1;
3758 if (o_operand_count != operand_count + 1
3759 || xtensa_operand_get_field (isa, opcode, 0,
3760 fmt, 0, slotbuf, &rawval0) != 0
3761 || xtensa_operand_get_field (isa, opcode, 1,
3762 fmt, 0, slotbuf, &rawval1) != 0
3763 || rawval0 == rawval1 /* it is a nop */)
3767 check_operand_count--;
3769 for (i = 0; i < check_operand_count; i++)
3772 if (is_or && i == o_operand_count - 1)
3774 if (xtensa_operand_get_field (isa, opcode, new_i, fmt, 0,
3776 || xtensa_operand_decode (isa, opcode, new_i, &value))
3779 /* PC-relative branches need adjustment, but
3780 the PC-rel operand will always have a relocation. */
3782 if (xtensa_operand_do_reloc (isa, o_opcode, i, &newval,
3784 || xtensa_operand_encode (isa, o_opcode, i, &newval)
3785 || xtensa_operand_set_field (isa, o_opcode, i, o_fmt, 0,
3790 if (xtensa_format_set_slot (isa, o_fmt, 0, o_insnbuf, o_slotbuf))
3800 /* Attempt to widen an instruction. If the widening is valid, perform
3801 the action in-place directly into the contents and return TRUE. Otherwise,
3802 the return value is FALSE and the contents are not modified. */
3805 widen_instruction (bfd_byte *contents,
3806 bfd_size_type content_length,
3807 bfd_size_type offset)
3809 xtensa_opcode opcode;
3810 bfd_size_type insn_len;
3811 xtensa_isa isa = xtensa_default_isa;
3813 xtensa_insnbuf o_insnbuf;
3815 static xtensa_insnbuf insnbuf = NULL;
3816 static xtensa_insnbuf slotbuf = NULL;
3818 if (insnbuf == NULL)
3820 insnbuf = xtensa_insnbuf_alloc (isa);
3821 slotbuf = xtensa_insnbuf_alloc (isa);
3824 BFD_ASSERT (offset < content_length);
3826 if (content_length < 2)
3829 /* We will hand-code a few of these for a little while.
3830 These have all been specified in the assembler aleady. */
3831 xtensa_insnbuf_from_chars (isa, insnbuf, &contents[offset],
3832 content_length - offset);
3833 fmt = xtensa_format_decode (isa, insnbuf);
3834 if (xtensa_format_num_slots (isa, fmt) != 1)
3837 if (xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf) != 0)
3840 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
3841 if (opcode == XTENSA_UNDEFINED)
3843 insn_len = xtensa_format_length (isa, fmt);
3844 if (insn_len > content_length)
3847 o_insnbuf = can_widen_instruction (slotbuf, fmt, opcode);
3850 xtensa_insnbuf_to_chars (isa, o_insnbuf, contents + offset,
3851 content_length - offset);
3858 /* Code for transforming CALLs at link-time. */
3860 static bfd_reloc_status_type
3861 elf_xtensa_do_asm_simplify (bfd_byte *contents,
3863 bfd_vma content_length,
3864 char **error_message)
3866 static xtensa_insnbuf insnbuf = NULL;
3867 static xtensa_insnbuf slotbuf = NULL;
3868 xtensa_format core_format = XTENSA_UNDEFINED;
3869 xtensa_opcode opcode;
3870 xtensa_opcode direct_call_opcode;
3871 xtensa_isa isa = xtensa_default_isa;
3872 bfd_byte *chbuf = contents + address;
3875 if (insnbuf == NULL)
3877 insnbuf = xtensa_insnbuf_alloc (isa);
3878 slotbuf = xtensa_insnbuf_alloc (isa);
3881 if (content_length < address)
3883 *error_message = _("Attempt to convert L32R/CALLX to CALL failed");
3884 return bfd_reloc_other;
3887 opcode = get_expanded_call_opcode (chbuf, content_length - address, 0);
3888 direct_call_opcode = swap_callx_for_call_opcode (opcode);
3889 if (direct_call_opcode == XTENSA_UNDEFINED)
3891 *error_message = _("Attempt to convert L32R/CALLX to CALL failed");
3892 return bfd_reloc_other;
3895 /* Assemble a NOP ("or a1, a1, a1") into the 0 byte offset. */
3896 core_format = xtensa_format_lookup (isa, "x24");
3897 opcode = xtensa_opcode_lookup (isa, "or");
3898 xtensa_opcode_encode (isa, core_format, 0, slotbuf, opcode);
3899 for (opn = 0; opn < 3; opn++)
3902 xtensa_operand_encode (isa, opcode, opn, ®no);
3903 xtensa_operand_set_field (isa, opcode, opn, core_format, 0,
3906 xtensa_format_encode (isa, core_format, insnbuf);
3907 xtensa_format_set_slot (isa, core_format, 0, insnbuf, slotbuf);
3908 xtensa_insnbuf_to_chars (isa, insnbuf, chbuf, content_length - address);
3910 /* Assemble a CALL ("callN 0") into the 3 byte offset. */
3911 xtensa_opcode_encode (isa, core_format, 0, slotbuf, direct_call_opcode);
3912 xtensa_operand_set_field (isa, opcode, 0, core_format, 0, slotbuf, 0);
3914 xtensa_format_encode (isa, core_format, insnbuf);
3915 xtensa_format_set_slot (isa, core_format, 0, insnbuf, slotbuf);
3916 xtensa_insnbuf_to_chars (isa, insnbuf, chbuf + 3,
3917 content_length - address - 3);
3919 return bfd_reloc_ok;
3923 static bfd_reloc_status_type
3924 contract_asm_expansion (bfd_byte *contents,
3925 bfd_vma content_length,
3926 Elf_Internal_Rela *irel,
3927 char **error_message)
3929 bfd_reloc_status_type retval =
3930 elf_xtensa_do_asm_simplify (contents, irel->r_offset, content_length,
3933 if (retval != bfd_reloc_ok)
3934 return bfd_reloc_dangerous;
3936 /* Update the irel->r_offset field so that the right immediate and
3937 the right instruction are modified during the relocation. */
3938 irel->r_offset += 3;
3939 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), R_XTENSA_SLOT0_OP);
3940 return bfd_reloc_ok;
3944 static xtensa_opcode
3945 swap_callx_for_call_opcode (xtensa_opcode opcode)
3947 init_call_opcodes ();
3949 if (opcode == callx0_op) return call0_op;
3950 if (opcode == callx4_op) return call4_op;
3951 if (opcode == callx8_op) return call8_op;
3952 if (opcode == callx12_op) return call12_op;
3954 /* Return XTENSA_UNDEFINED if the opcode is not an indirect call. */
3955 return XTENSA_UNDEFINED;
3959 /* Check if "buf" is pointing to a "L32R aN; CALLX aN" or "CONST16 aN;
3960 CONST16 aN; CALLX aN" sequence, and if so, return the CALLX opcode.
3961 If not, return XTENSA_UNDEFINED. */
3963 #define L32R_TARGET_REG_OPERAND 0
3964 #define CONST16_TARGET_REG_OPERAND 0
3965 #define CALLN_SOURCE_OPERAND 0
3967 static xtensa_opcode
3968 get_expanded_call_opcode (bfd_byte *buf, int bufsize, bfd_boolean *p_uses_l32r)
3970 static xtensa_insnbuf insnbuf = NULL;
3971 static xtensa_insnbuf slotbuf = NULL;
3973 xtensa_opcode opcode;
3974 xtensa_isa isa = xtensa_default_isa;
3975 uint32 regno, const16_regno, call_regno;
3978 if (insnbuf == NULL)
3980 insnbuf = xtensa_insnbuf_alloc (isa);
3981 slotbuf = xtensa_insnbuf_alloc (isa);
3984 xtensa_insnbuf_from_chars (isa, insnbuf, buf, bufsize);
3985 fmt = xtensa_format_decode (isa, insnbuf);
3986 if (fmt == XTENSA_UNDEFINED
3987 || xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf))
3988 return XTENSA_UNDEFINED;
3990 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
3991 if (opcode == XTENSA_UNDEFINED)
3992 return XTENSA_UNDEFINED;
3994 if (opcode == get_l32r_opcode ())
3997 *p_uses_l32r = TRUE;
3998 if (xtensa_operand_get_field (isa, opcode, L32R_TARGET_REG_OPERAND,
3999 fmt, 0, slotbuf, ®no)
4000 || xtensa_operand_decode (isa, opcode, L32R_TARGET_REG_OPERAND,
4002 return XTENSA_UNDEFINED;
4004 else if (opcode == get_const16_opcode ())
4007 *p_uses_l32r = FALSE;
4008 if (xtensa_operand_get_field (isa, opcode, CONST16_TARGET_REG_OPERAND,
4009 fmt, 0, slotbuf, ®no)
4010 || xtensa_operand_decode (isa, opcode, CONST16_TARGET_REG_OPERAND,
4012 return XTENSA_UNDEFINED;
4014 /* Check that the next instruction is also CONST16. */
4015 offset += xtensa_format_length (isa, fmt);
4016 xtensa_insnbuf_from_chars (isa, insnbuf, buf + offset, bufsize - offset);
4017 fmt = xtensa_format_decode (isa, insnbuf);
4018 if (fmt == XTENSA_UNDEFINED
4019 || xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf))
4020 return XTENSA_UNDEFINED;
4021 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
4022 if (opcode != get_const16_opcode ())
4023 return XTENSA_UNDEFINED;
4025 if (xtensa_operand_get_field (isa, opcode, CONST16_TARGET_REG_OPERAND,
4026 fmt, 0, slotbuf, &const16_regno)
4027 || xtensa_operand_decode (isa, opcode, CONST16_TARGET_REG_OPERAND,
4029 || const16_regno != regno)
4030 return XTENSA_UNDEFINED;
4033 return XTENSA_UNDEFINED;
4035 /* Next instruction should be an CALLXn with operand 0 == regno. */
4036 offset += xtensa_format_length (isa, fmt);
4037 xtensa_insnbuf_from_chars (isa, insnbuf, buf + offset, bufsize - offset);
4038 fmt = xtensa_format_decode (isa, insnbuf);
4039 if (fmt == XTENSA_UNDEFINED
4040 || xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf))
4041 return XTENSA_UNDEFINED;
4042 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
4043 if (opcode == XTENSA_UNDEFINED
4044 || !is_indirect_call_opcode (opcode))
4045 return XTENSA_UNDEFINED;
4047 if (xtensa_operand_get_field (isa, opcode, CALLN_SOURCE_OPERAND,
4048 fmt, 0, slotbuf, &call_regno)
4049 || xtensa_operand_decode (isa, opcode, CALLN_SOURCE_OPERAND,
4051 return XTENSA_UNDEFINED;
4053 if (call_regno != regno)
4054 return XTENSA_UNDEFINED;
4060 /* Data structures used during relaxation. */
4062 /* r_reloc: relocation values. */
4064 /* Through the relaxation process, we need to keep track of the values
4065 that will result from evaluating relocations. The standard ELF
4066 relocation structure is not sufficient for this purpose because we're
4067 operating on multiple input files at once, so we need to know which
4068 input file a relocation refers to. The r_reloc structure thus
4069 records both the input file (bfd) and ELF relocation.
4071 For efficiency, an r_reloc also contains a "target_offset" field to
4072 cache the target-section-relative offset value that is represented by
4075 The r_reloc also contains a virtual offset that allows multiple
4076 inserted literals to be placed at the same "address" with
4077 different offsets. */
4079 typedef struct r_reloc_struct r_reloc;
4081 struct r_reloc_struct
4084 Elf_Internal_Rela rela;
4085 bfd_vma target_offset;
4086 bfd_vma virtual_offset;
4090 /* The r_reloc structure is included by value in literal_value, but not
4091 every literal_value has an associated relocation -- some are simple
4092 constants. In such cases, we set all the fields in the r_reloc
4093 struct to zero. The r_reloc_is_const function should be used to
4094 detect this case. */
4097 r_reloc_is_const (const r_reloc *r_rel)
4099 return (r_rel->abfd == NULL);
4104 r_reloc_get_target_offset (const r_reloc *r_rel)
4106 bfd_vma target_offset;
4107 unsigned long r_symndx;
4109 BFD_ASSERT (!r_reloc_is_const (r_rel));
4110 r_symndx = ELF32_R_SYM (r_rel->rela.r_info);
4111 target_offset = get_elf_r_symndx_offset (r_rel->abfd, r_symndx);
4112 return (target_offset + r_rel->rela.r_addend);
4116 static struct elf_link_hash_entry *
4117 r_reloc_get_hash_entry (const r_reloc *r_rel)
4119 unsigned long r_symndx = ELF32_R_SYM (r_rel->rela.r_info);
4120 return get_elf_r_symndx_hash_entry (r_rel->abfd, r_symndx);
4125 r_reloc_get_section (const r_reloc *r_rel)
4127 unsigned long r_symndx = ELF32_R_SYM (r_rel->rela.r_info);
4128 return get_elf_r_symndx_section (r_rel->abfd, r_symndx);
4133 r_reloc_is_defined (const r_reloc *r_rel)
4139 sec = r_reloc_get_section (r_rel);
4140 if (sec == bfd_abs_section_ptr
4141 || sec == bfd_com_section_ptr
4142 || sec == bfd_und_section_ptr)
4149 r_reloc_init (r_reloc *r_rel,
4151 Elf_Internal_Rela *irel,
4153 bfd_size_type content_length)
4156 reloc_howto_type *howto;
4160 r_rel->rela = *irel;
4162 r_rel->target_offset = r_reloc_get_target_offset (r_rel);
4163 r_rel->virtual_offset = 0;
4164 r_type = ELF32_R_TYPE (r_rel->rela.r_info);
4165 howto = &elf_howto_table[r_type];
4166 if (howto->partial_inplace)
4168 bfd_vma inplace_val;
4169 BFD_ASSERT (r_rel->rela.r_offset < content_length);
4171 inplace_val = bfd_get_32 (abfd, &contents[r_rel->rela.r_offset]);
4172 r_rel->target_offset += inplace_val;
4176 memset (r_rel, 0, sizeof (r_reloc));
4183 print_r_reloc (FILE *fp, const r_reloc *r_rel)
4185 if (r_reloc_is_defined (r_rel))
4187 asection *sec = r_reloc_get_section (r_rel);
4188 fprintf (fp, " %s(%s + ", sec->owner->filename, sec->name);
4190 else if (r_reloc_get_hash_entry (r_rel))
4191 fprintf (fp, " %s + ", r_reloc_get_hash_entry (r_rel)->root.root.string);
4193 fprintf (fp, " ?? + ");
4195 fprintf_vma (fp, r_rel->target_offset);
4196 if (r_rel->virtual_offset)
4198 fprintf (fp, " + ");
4199 fprintf_vma (fp, r_rel->virtual_offset);
4208 /* source_reloc: relocations that reference literals. */
4210 /* To determine whether literals can be coalesced, we need to first
4211 record all the relocations that reference the literals. The
4212 source_reloc structure below is used for this purpose. The
4213 source_reloc entries are kept in a per-literal-section array, sorted
4214 by offset within the literal section (i.e., target offset).
4216 The source_sec and r_rel.rela.r_offset fields identify the source of
4217 the relocation. The r_rel field records the relocation value, i.e.,
4218 the offset of the literal being referenced. The opnd field is needed
4219 to determine the range of the immediate field to which the relocation
4220 applies, so we can determine whether another literal with the same
4221 value is within range. The is_null field is true when the relocation
4222 is being removed (e.g., when an L32R is being removed due to a CALLX
4223 that is converted to a direct CALL). */
4225 typedef struct source_reloc_struct source_reloc;
4227 struct source_reloc_struct
4229 asection *source_sec;
4231 xtensa_opcode opcode;
4233 bfd_boolean is_null;
4234 bfd_boolean is_abs_literal;
4239 init_source_reloc (source_reloc *reloc,
4240 asection *source_sec,
4241 const r_reloc *r_rel,
4242 xtensa_opcode opcode,
4244 bfd_boolean is_abs_literal)
4246 reloc->source_sec = source_sec;
4247 reloc->r_rel = *r_rel;
4248 reloc->opcode = opcode;
4250 reloc->is_null = FALSE;
4251 reloc->is_abs_literal = is_abs_literal;
4255 /* Find the source_reloc for a particular source offset and relocation
4256 type. Note that the array is sorted by _target_ offset, so this is
4257 just a linear search. */
4259 static source_reloc *
4260 find_source_reloc (source_reloc *src_relocs,
4263 Elf_Internal_Rela *irel)
4267 for (i = 0; i < src_count; i++)
4269 if (src_relocs[i].source_sec == sec
4270 && src_relocs[i].r_rel.rela.r_offset == irel->r_offset
4271 && (ELF32_R_TYPE (src_relocs[i].r_rel.rela.r_info)
4272 == ELF32_R_TYPE (irel->r_info)))
4273 return &src_relocs[i];
4281 source_reloc_compare (const void *ap, const void *bp)
4283 const source_reloc *a = (const source_reloc *) ap;
4284 const source_reloc *b = (const source_reloc *) bp;
4286 if (a->r_rel.target_offset != b->r_rel.target_offset)
4287 return (a->r_rel.target_offset - b->r_rel.target_offset);
4289 /* We don't need to sort on these criteria for correctness,
4290 but enforcing a more strict ordering prevents unstable qsort
4291 from behaving differently with different implementations.
4292 Without the code below we get correct but different results
4293 on Solaris 2.7 and 2.8. We would like to always produce the
4294 same results no matter the host. */
4296 if ((!a->is_null) - (!b->is_null))
4297 return ((!a->is_null) - (!b->is_null));
4298 return internal_reloc_compare (&a->r_rel.rela, &b->r_rel.rela);
4302 /* Literal values and value hash tables. */
4304 /* Literals with the same value can be coalesced. The literal_value
4305 structure records the value of a literal: the "r_rel" field holds the
4306 information from the relocation on the literal (if there is one) and
4307 the "value" field holds the contents of the literal word itself.
4309 The value_map structure records a literal value along with the
4310 location of a literal holding that value. The value_map hash table
4311 is indexed by the literal value, so that we can quickly check if a
4312 particular literal value has been seen before and is thus a candidate
4315 typedef struct literal_value_struct literal_value;
4316 typedef struct value_map_struct value_map;
4317 typedef struct value_map_hash_table_struct value_map_hash_table;
4319 struct literal_value_struct
4322 unsigned long value;
4323 bfd_boolean is_abs_literal;
4326 struct value_map_struct
4328 literal_value val; /* The literal value. */
4329 r_reloc loc; /* Location of the literal. */
4333 struct value_map_hash_table_struct
4335 unsigned bucket_count;
4336 value_map **buckets;
4338 bfd_boolean has_last_loc;
4344 init_literal_value (literal_value *lit,
4345 const r_reloc *r_rel,
4346 unsigned long value,
4347 bfd_boolean is_abs_literal)
4349 lit->r_rel = *r_rel;
4351 lit->is_abs_literal = is_abs_literal;
4356 literal_value_equal (const literal_value *src1,
4357 const literal_value *src2,
4358 bfd_boolean final_static_link)
4360 struct elf_link_hash_entry *h1, *h2;
4362 if (r_reloc_is_const (&src1->r_rel) != r_reloc_is_const (&src2->r_rel))
4365 if (r_reloc_is_const (&src1->r_rel))
4366 return (src1->value == src2->value);
4368 if (ELF32_R_TYPE (src1->r_rel.rela.r_info)
4369 != ELF32_R_TYPE (src2->r_rel.rela.r_info))
4372 if (src1->r_rel.target_offset != src2->r_rel.target_offset)
4375 if (src1->r_rel.virtual_offset != src2->r_rel.virtual_offset)
4378 if (src1->value != src2->value)
4381 /* Now check for the same section (if defined) or the same elf_hash
4382 (if undefined or weak). */
4383 h1 = r_reloc_get_hash_entry (&src1->r_rel);
4384 h2 = r_reloc_get_hash_entry (&src2->r_rel);
4385 if (r_reloc_is_defined (&src1->r_rel)
4386 && (final_static_link
4387 || ((!h1 || h1->root.type != bfd_link_hash_defweak)
4388 && (!h2 || h2->root.type != bfd_link_hash_defweak))))
4390 if (r_reloc_get_section (&src1->r_rel)
4391 != r_reloc_get_section (&src2->r_rel))
4396 /* Require that the hash entries (i.e., symbols) be identical. */
4397 if (h1 != h2 || h1 == 0)
4401 if (src1->is_abs_literal != src2->is_abs_literal)
4408 /* Must be power of 2. */
4409 #define INITIAL_HASH_RELOC_BUCKET_COUNT 1024
4411 static value_map_hash_table *
4412 value_map_hash_table_init (void)
4414 value_map_hash_table *values;
4416 values = (value_map_hash_table *)
4417 bfd_zmalloc (sizeof (value_map_hash_table));
4418 values->bucket_count = INITIAL_HASH_RELOC_BUCKET_COUNT;
4420 values->buckets = (value_map **)
4421 bfd_zmalloc (sizeof (value_map *) * values->bucket_count);
4422 if (values->buckets == NULL)
4427 values->has_last_loc = FALSE;
4434 value_map_hash_table_delete (value_map_hash_table *table)
4436 free (table->buckets);
4442 hash_bfd_vma (bfd_vma val)
4444 return (val >> 2) + (val >> 10);
4449 literal_value_hash (const literal_value *src)
4453 hash_val = hash_bfd_vma (src->value);
4454 if (!r_reloc_is_const (&src->r_rel))
4458 hash_val += hash_bfd_vma (src->is_abs_literal * 1000);
4459 hash_val += hash_bfd_vma (src->r_rel.target_offset);
4460 hash_val += hash_bfd_vma (src->r_rel.virtual_offset);
4462 /* Now check for the same section and the same elf_hash. */
4463 if (r_reloc_is_defined (&src->r_rel))
4464 sec_or_hash = r_reloc_get_section (&src->r_rel);
4466 sec_or_hash = r_reloc_get_hash_entry (&src->r_rel);
4467 hash_val += hash_bfd_vma ((bfd_vma) (size_t) sec_or_hash);
4473 /* Check if the specified literal_value has been seen before. */
4476 value_map_get_cached_value (value_map_hash_table *map,
4477 const literal_value *val,
4478 bfd_boolean final_static_link)
4484 idx = literal_value_hash (val);
4485 idx = idx & (map->bucket_count - 1);
4486 bucket = map->buckets[idx];
4487 for (map_e = bucket; map_e; map_e = map_e->next)
4489 if (literal_value_equal (&map_e->val, val, final_static_link))
4496 /* Record a new literal value. It is illegal to call this if VALUE
4497 already has an entry here. */
4500 add_value_map (value_map_hash_table *map,
4501 const literal_value *val,
4503 bfd_boolean final_static_link)
4505 value_map **bucket_p;
4508 value_map *val_e = (value_map *) bfd_zmalloc (sizeof (value_map));
4511 bfd_set_error (bfd_error_no_memory);
4515 BFD_ASSERT (!value_map_get_cached_value (map, val, final_static_link));
4519 idx = literal_value_hash (val);
4520 idx = idx & (map->bucket_count - 1);
4521 bucket_p = &map->buckets[idx];
4523 val_e->next = *bucket_p;
4526 /* FIXME: Consider resizing the hash table if we get too many entries. */
4532 /* Lists of text actions (ta_) for narrowing, widening, longcall
4533 conversion, space fill, code & literal removal, etc. */
4535 /* The following text actions are generated:
4537 "ta_remove_insn" remove an instruction or instructions
4538 "ta_remove_longcall" convert longcall to call
4539 "ta_convert_longcall" convert longcall to nop/call
4540 "ta_narrow_insn" narrow a wide instruction
4541 "ta_widen" widen a narrow instruction
4542 "ta_fill" add fill or remove fill
4543 removed < 0 is a fill; branches to the fill address will be
4544 changed to address + fill size (e.g., address - removed)
4545 removed >= 0 branches to the fill address will stay unchanged
4546 "ta_remove_literal" remove a literal; this action is
4547 indicated when a literal is removed
4549 "ta_add_literal" insert a new literal; this action is
4550 indicated when a literal has been moved.
4551 It may use a virtual_offset because
4552 multiple literals can be placed at the
4555 For each of these text actions, we also record the number of bytes
4556 removed by performing the text action. In the case of a "ta_widen"
4557 or a "ta_fill" that adds space, the removed_bytes will be negative. */
4559 typedef struct text_action_struct text_action;
4560 typedef struct text_action_list_struct text_action_list;
4561 typedef enum text_action_enum_t text_action_t;
4563 enum text_action_enum_t
4566 ta_remove_insn, /* removed = -size */
4567 ta_remove_longcall, /* removed = -size */
4568 ta_convert_longcall, /* removed = 0 */
4569 ta_narrow_insn, /* removed = -1 */
4570 ta_widen_insn, /* removed = +1 */
4571 ta_fill, /* removed = +size */
4577 /* Structure for a text action record. */
4578 struct text_action_struct
4580 text_action_t action;
4581 asection *sec; /* Optional */
4583 bfd_vma virtual_offset; /* Zero except for adding literals. */
4585 literal_value value; /* Only valid when adding literals. */
4591 /* List of all of the actions taken on a text section. */
4592 struct text_action_list_struct
4598 static text_action *
4599 find_fill_action (text_action_list *l, asection *sec, bfd_vma offset)
4603 /* It is not necessary to fill at the end of a section. */
4604 if (sec->size == offset)
4607 for (m_p = &l->head; *m_p && (*m_p)->offset <= offset; m_p = &(*m_p)->next)
4609 text_action *t = *m_p;
4610 /* When the action is another fill at the same address,
4611 just increase the size. */
4612 if (t->offset == offset && t->action == ta_fill)
4620 compute_removed_action_diff (const text_action *ta,
4624 int removable_space)
4627 int current_removed = 0;
4630 current_removed = ta->removed_bytes;
4632 BFD_ASSERT (ta == NULL || ta->offset == offset);
4633 BFD_ASSERT (ta == NULL || ta->action == ta_fill);
4635 /* It is not necessary to fill at the end of a section. Clean this up. */
4636 if (sec->size == offset)
4637 new_removed = removable_space - 0;
4641 int added = -removed - current_removed;
4642 /* Ignore multiples of the section alignment. */
4643 added = ((1 << sec->alignment_power) - 1) & added;
4644 new_removed = (-added);
4646 /* Modify for removable. */
4647 space = removable_space - new_removed;
4648 new_removed = (removable_space
4649 - (((1 << sec->alignment_power) - 1) & space));
4651 return (new_removed - current_removed);
4656 adjust_fill_action (text_action *ta, int fill_diff)
4658 ta->removed_bytes += fill_diff;
4662 /* Add a modification action to the text. For the case of adding or
4663 removing space, modify any current fill and assume that
4664 "unreachable_space" bytes can be freely contracted. Note that a
4665 negative removed value is a fill. */
4668 text_action_add (text_action_list *l,
4669 text_action_t action,
4677 /* It is not necessary to fill at the end of a section. */
4678 if (action == ta_fill && sec->size == offset)
4681 /* It is not necessary to fill 0 bytes. */
4682 if (action == ta_fill && removed == 0)
4685 for (m_p = &l->head; *m_p && (*m_p)->offset <= offset; m_p = &(*m_p)->next)
4687 text_action *t = *m_p;
4688 /* When the action is another fill at the same address,
4689 just increase the size. */
4690 if (t->offset == offset && t->action == ta_fill && action == ta_fill)
4692 t->removed_bytes += removed;
4697 /* Create a new record and fill it up. */
4698 ta = (text_action *) bfd_zmalloc (sizeof (text_action));
4699 ta->action = action;
4701 ta->offset = offset;
4702 ta->removed_bytes = removed;
4709 text_action_add_literal (text_action_list *l,
4710 text_action_t action,
4712 const literal_value *value,
4717 asection *sec = r_reloc_get_section (loc);
4718 bfd_vma offset = loc->target_offset;
4719 bfd_vma virtual_offset = loc->virtual_offset;
4721 BFD_ASSERT (action == ta_add_literal);
4723 for (m_p = &l->head; *m_p != NULL; m_p = &(*m_p)->next)
4725 if ((*m_p)->offset > offset
4726 && ((*m_p)->offset != offset
4727 || (*m_p)->virtual_offset > virtual_offset))
4731 /* Create a new record and fill it up. */
4732 ta = (text_action *) bfd_zmalloc (sizeof (text_action));
4733 ta->action = action;
4735 ta->offset = offset;
4736 ta->virtual_offset = virtual_offset;
4738 ta->removed_bytes = removed;
4744 /* Find the total offset adjustment for the relaxations specified by
4745 text_actions, beginning from a particular starting action. This is
4746 typically used from offset_with_removed_text to search an entire list of
4747 actions, but it may also be called directly when adjusting adjacent offsets
4748 so that each search may begin where the previous one left off. */
4751 removed_by_actions (text_action **p_start_action,
4753 bfd_boolean before_fill)
4758 r = *p_start_action;
4761 if (r->offset > offset)
4764 if (r->offset == offset
4765 && (before_fill || r->action != ta_fill || r->removed_bytes >= 0))
4768 removed += r->removed_bytes;
4773 *p_start_action = r;
4779 offset_with_removed_text (text_action_list *action_list, bfd_vma offset)
4781 text_action *r = action_list->head;
4782 return offset - removed_by_actions (&r, offset, FALSE);
4787 action_list_count (text_action_list *action_list)
4789 text_action *r = action_list->head;
4791 for (r = action_list->head; r != NULL; r = r->next)
4799 /* The find_insn_action routine will only find non-fill actions. */
4801 static text_action *
4802 find_insn_action (text_action_list *action_list, bfd_vma offset)
4805 for (t = action_list->head; t; t = t->next)
4807 if (t->offset == offset)
4814 case ta_remove_insn:
4815 case ta_remove_longcall:
4816 case ta_convert_longcall:
4817 case ta_narrow_insn:
4820 case ta_remove_literal:
4821 case ta_add_literal:
4834 print_action_list (FILE *fp, text_action_list *action_list)
4838 fprintf (fp, "Text Action\n");
4839 for (r = action_list->head; r != NULL; r = r->next)
4841 const char *t = "unknown";
4844 case ta_remove_insn:
4845 t = "remove_insn"; break;
4846 case ta_remove_longcall:
4847 t = "remove_longcall"; break;
4848 case ta_convert_longcall:
4849 t = "remove_longcall"; break;
4850 case ta_narrow_insn:
4851 t = "narrow_insn"; break;
4853 t = "widen_insn"; break;
4858 case ta_remove_literal:
4859 t = "remove_literal"; break;
4860 case ta_add_literal:
4861 t = "add_literal"; break;
4864 fprintf (fp, "%s: %s[0x%lx] \"%s\" %d\n",
4865 r->sec->owner->filename,
4866 r->sec->name, r->offset, t, r->removed_bytes);
4873 /* Lists of literals being coalesced or removed. */
4875 /* In the usual case, the literal identified by "from" is being
4876 coalesced with another literal identified by "to". If the literal is
4877 unused and is being removed altogether, "to.abfd" will be NULL.
4878 The removed_literal entries are kept on a per-section list, sorted
4879 by the "from" offset field. */
4881 typedef struct removed_literal_struct removed_literal;
4882 typedef struct removed_literal_list_struct removed_literal_list;
4884 struct removed_literal_struct
4888 removed_literal *next;
4891 struct removed_literal_list_struct
4893 removed_literal *head;
4894 removed_literal *tail;
4898 /* Record that the literal at "from" is being removed. If "to" is not
4899 NULL, the "from" literal is being coalesced with the "to" literal. */
4902 add_removed_literal (removed_literal_list *removed_list,
4903 const r_reloc *from,
4906 removed_literal *r, *new_r, *next_r;
4908 new_r = (removed_literal *) bfd_zmalloc (sizeof (removed_literal));
4910 new_r->from = *from;
4914 new_r->to.abfd = NULL;
4917 r = removed_list->head;
4920 removed_list->head = new_r;
4921 removed_list->tail = new_r;
4923 /* Special check for common case of append. */
4924 else if (removed_list->tail->from.target_offset < from->target_offset)
4926 removed_list->tail->next = new_r;
4927 removed_list->tail = new_r;
4931 while (r->from.target_offset < from->target_offset && r->next)
4937 new_r->next = next_r;
4939 removed_list->tail = new_r;
4944 /* Check if the list of removed literals contains an entry for the
4945 given address. Return the entry if found. */
4947 static removed_literal *
4948 find_removed_literal (removed_literal_list *removed_list, bfd_vma addr)
4950 removed_literal *r = removed_list->head;
4951 while (r && r->from.target_offset < addr)
4953 if (r && r->from.target_offset == addr)
4962 print_removed_literals (FILE *fp, removed_literal_list *removed_list)
4965 r = removed_list->head;
4967 fprintf (fp, "Removed Literals\n");
4968 for (; r != NULL; r = r->next)
4970 print_r_reloc (fp, &r->from);
4971 fprintf (fp, " => ");
4972 if (r->to.abfd == NULL)
4973 fprintf (fp, "REMOVED");
4975 print_r_reloc (fp, &r->to);
4983 /* Per-section data for relaxation. */
4985 typedef struct reloc_bfd_fix_struct reloc_bfd_fix;
4987 struct xtensa_relax_info_struct
4989 bfd_boolean is_relaxable_literal_section;
4990 bfd_boolean is_relaxable_asm_section;
4991 int visited; /* Number of times visited. */
4993 source_reloc *src_relocs; /* Array[src_count]. */
4995 int src_next; /* Next src_relocs entry to assign. */
4997 removed_literal_list removed_list;
4998 text_action_list action_list;
5000 reloc_bfd_fix *fix_list;
5001 reloc_bfd_fix *fix_array;
5002 unsigned fix_array_count;
5004 /* Support for expanding the reloc array that is stored
5005 in the section structure. If the relocations have been
5006 reallocated, the newly allocated relocations will be referenced
5007 here along with the actual size allocated. The relocation
5008 count will always be found in the section structure. */
5009 Elf_Internal_Rela *allocated_relocs;
5010 unsigned relocs_count;
5011 unsigned allocated_relocs_count;
5014 struct elf_xtensa_section_data
5016 struct bfd_elf_section_data elf;
5017 xtensa_relax_info relax_info;
5022 elf_xtensa_new_section_hook (bfd *abfd, asection *sec)
5024 if (!sec->used_by_bfd)
5026 struct elf_xtensa_section_data *sdata;
5027 bfd_size_type amt = sizeof (*sdata);
5029 sdata = bfd_zalloc (abfd, amt);
5032 sec->used_by_bfd = sdata;
5035 return _bfd_elf_new_section_hook (abfd, sec);
5039 static xtensa_relax_info *
5040 get_xtensa_relax_info (asection *sec)
5042 struct elf_xtensa_section_data *section_data;
5044 /* No info available if no section or if it is an output section. */
5045 if (!sec || sec == sec->output_section)
5048 section_data = (struct elf_xtensa_section_data *) elf_section_data (sec);
5049 return §ion_data->relax_info;
5054 init_xtensa_relax_info (asection *sec)
5056 xtensa_relax_info *relax_info = get_xtensa_relax_info (sec);
5058 relax_info->is_relaxable_literal_section = FALSE;
5059 relax_info->is_relaxable_asm_section = FALSE;
5060 relax_info->visited = 0;
5062 relax_info->src_relocs = NULL;
5063 relax_info->src_count = 0;
5064 relax_info->src_next = 0;
5066 relax_info->removed_list.head = NULL;
5067 relax_info->removed_list.tail = NULL;
5069 relax_info->action_list.head = NULL;
5071 relax_info->fix_list = NULL;
5072 relax_info->fix_array = NULL;
5073 relax_info->fix_array_count = 0;
5075 relax_info->allocated_relocs = NULL;
5076 relax_info->relocs_count = 0;
5077 relax_info->allocated_relocs_count = 0;
5081 /* Coalescing literals may require a relocation to refer to a section in
5082 a different input file, but the standard relocation information
5083 cannot express that. Instead, the reloc_bfd_fix structures are used
5084 to "fix" the relocations that refer to sections in other input files.
5085 These structures are kept on per-section lists. The "src_type" field
5086 records the relocation type in case there are multiple relocations on
5087 the same location. FIXME: This is ugly; an alternative might be to
5088 add new symbols with the "owner" field to some other input file. */
5090 struct reloc_bfd_fix_struct
5094 unsigned src_type; /* Relocation type. */
5096 asection *target_sec;
5097 bfd_vma target_offset;
5098 bfd_boolean translated;
5100 reloc_bfd_fix *next;
5104 static reloc_bfd_fix *
5105 reloc_bfd_fix_init (asection *src_sec,
5108 asection *target_sec,
5109 bfd_vma target_offset,
5110 bfd_boolean translated)
5114 fix = (reloc_bfd_fix *) bfd_malloc (sizeof (reloc_bfd_fix));
5115 fix->src_sec = src_sec;
5116 fix->src_offset = src_offset;
5117 fix->src_type = src_type;
5118 fix->target_sec = target_sec;
5119 fix->target_offset = target_offset;
5120 fix->translated = translated;
5127 add_fix (asection *src_sec, reloc_bfd_fix *fix)
5129 xtensa_relax_info *relax_info;
5131 relax_info = get_xtensa_relax_info (src_sec);
5132 fix->next = relax_info->fix_list;
5133 relax_info->fix_list = fix;
5138 fix_compare (const void *ap, const void *bp)
5140 const reloc_bfd_fix *a = (const reloc_bfd_fix *) ap;
5141 const reloc_bfd_fix *b = (const reloc_bfd_fix *) bp;
5143 if (a->src_offset != b->src_offset)
5144 return (a->src_offset - b->src_offset);
5145 return (a->src_type - b->src_type);
5150 cache_fix_array (asection *sec)
5152 unsigned i, count = 0;
5154 xtensa_relax_info *relax_info = get_xtensa_relax_info (sec);
5156 if (relax_info == NULL)
5158 if (relax_info->fix_list == NULL)
5161 for (r = relax_info->fix_list; r != NULL; r = r->next)
5164 relax_info->fix_array =
5165 (reloc_bfd_fix *) bfd_malloc (sizeof (reloc_bfd_fix) * count);
5166 relax_info->fix_array_count = count;
5168 r = relax_info->fix_list;
5169 for (i = 0; i < count; i++, r = r->next)
5171 relax_info->fix_array[count - 1 - i] = *r;
5172 relax_info->fix_array[count - 1 - i].next = NULL;
5175 qsort (relax_info->fix_array, relax_info->fix_array_count,
5176 sizeof (reloc_bfd_fix), fix_compare);
5180 static reloc_bfd_fix *
5181 get_bfd_fix (asection *sec, bfd_vma offset, unsigned type)
5183 xtensa_relax_info *relax_info = get_xtensa_relax_info (sec);
5187 if (relax_info == NULL)
5189 if (relax_info->fix_list == NULL)
5192 if (relax_info->fix_array == NULL)
5193 cache_fix_array (sec);
5195 key.src_offset = offset;
5196 key.src_type = type;
5197 rv = bsearch (&key, relax_info->fix_array, relax_info->fix_array_count,
5198 sizeof (reloc_bfd_fix), fix_compare);
5203 /* Section caching. */
5205 typedef struct section_cache_struct section_cache_t;
5207 struct section_cache_struct
5211 bfd_byte *contents; /* Cache of the section contents. */
5212 bfd_size_type content_length;
5214 property_table_entry *ptbl; /* Cache of the section property table. */
5217 Elf_Internal_Rela *relocs; /* Cache of the section relocations. */
5218 unsigned reloc_count;
5223 init_section_cache (section_cache_t *sec_cache)
5225 memset (sec_cache, 0, sizeof (*sec_cache));
5230 clear_section_cache (section_cache_t *sec_cache)
5234 release_contents (sec_cache->sec, sec_cache->contents);
5235 release_internal_relocs (sec_cache->sec, sec_cache->relocs);
5236 if (sec_cache->ptbl)
5237 free (sec_cache->ptbl);
5238 memset (sec_cache, 0, sizeof (sec_cache));
5244 section_cache_section (section_cache_t *sec_cache,
5246 struct bfd_link_info *link_info)
5249 property_table_entry *prop_table = NULL;
5251 bfd_byte *contents = NULL;
5252 Elf_Internal_Rela *internal_relocs = NULL;
5253 bfd_size_type sec_size;
5257 if (sec == sec_cache->sec)
5261 sec_size = bfd_get_section_limit (abfd, sec);
5263 /* Get the contents. */
5264 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
5265 if (contents == NULL && sec_size != 0)
5268 /* Get the relocations. */
5269 internal_relocs = retrieve_internal_relocs (abfd, sec,
5270 link_info->keep_memory);
5272 /* Get the entry table. */
5273 ptblsize = xtensa_read_table_entries (abfd, sec, &prop_table,
5274 XTENSA_PROP_SEC_NAME, FALSE);
5278 /* Fill in the new section cache. */
5279 clear_section_cache (sec_cache);
5280 memset (sec_cache, 0, sizeof (sec_cache));
5282 sec_cache->sec = sec;
5283 sec_cache->contents = contents;
5284 sec_cache->content_length = sec_size;
5285 sec_cache->relocs = internal_relocs;
5286 sec_cache->reloc_count = sec->reloc_count;
5287 sec_cache->pte_count = ptblsize;
5288 sec_cache->ptbl = prop_table;
5293 release_contents (sec, contents);
5294 release_internal_relocs (sec, internal_relocs);
5301 /* Extended basic blocks. */
5303 /* An ebb_struct represents an Extended Basic Block. Within this
5304 range, we guarantee that all instructions are decodable, the
5305 property table entries are contiguous, and no property table
5306 specifies a segment that cannot have instructions moved. This
5307 structure contains caches of the contents, property table and
5308 relocations for the specified section for easy use. The range is
5309 specified by ranges of indices for the byte offset, property table
5310 offsets and relocation offsets. These must be consistent. */
5312 typedef struct ebb_struct ebb_t;
5318 bfd_byte *contents; /* Cache of the section contents. */
5319 bfd_size_type content_length;
5321 property_table_entry *ptbl; /* Cache of the section property table. */
5324 Elf_Internal_Rela *relocs; /* Cache of the section relocations. */
5325 unsigned reloc_count;
5327 bfd_vma start_offset; /* Offset in section. */
5328 unsigned start_ptbl_idx; /* Offset in the property table. */
5329 unsigned start_reloc_idx; /* Offset in the relocations. */
5332 unsigned end_ptbl_idx;
5333 unsigned end_reloc_idx;
5335 bfd_boolean ends_section; /* Is this the last ebb in a section? */
5337 /* The unreachable property table at the end of this set of blocks;
5338 NULL if the end is not an unreachable block. */
5339 property_table_entry *ends_unreachable;
5343 enum ebb_target_enum
5346 EBB_DESIRE_TGT_ALIGN,
5347 EBB_REQUIRE_TGT_ALIGN,
5348 EBB_REQUIRE_LOOP_ALIGN,
5353 /* proposed_action_struct is similar to the text_action_struct except
5354 that is represents a potential transformation, not one that will
5355 occur. We build a list of these for an extended basic block
5356 and use them to compute the actual actions desired. We must be
5357 careful that the entire set of actual actions we perform do not
5358 break any relocations that would fit if the actions were not
5361 typedef struct proposed_action_struct proposed_action;
5363 struct proposed_action_struct
5365 enum ebb_target_enum align_type; /* for the target alignment */
5366 bfd_vma alignment_pow;
5367 text_action_t action;
5370 bfd_boolean do_action; /* If false, then we will not perform the action. */
5374 /* The ebb_constraint_struct keeps a set of proposed actions for an
5375 extended basic block. */
5377 typedef struct ebb_constraint_struct ebb_constraint;
5379 struct ebb_constraint_struct
5382 bfd_boolean start_movable;
5384 /* Bytes of extra space at the beginning if movable. */
5385 int start_extra_space;
5387 enum ebb_target_enum start_align;
5389 bfd_boolean end_movable;
5391 /* Bytes of extra space at the end if movable. */
5392 int end_extra_space;
5394 unsigned action_count;
5395 unsigned action_allocated;
5397 /* Array of proposed actions. */
5398 proposed_action *actions;
5400 /* Action alignments -- one for each proposed action. */
5401 enum ebb_target_enum *action_aligns;
5406 init_ebb_constraint (ebb_constraint *c)
5408 memset (c, 0, sizeof (ebb_constraint));
5413 free_ebb_constraint (ebb_constraint *c)
5421 init_ebb (ebb_t *ebb,
5424 bfd_size_type content_length,
5425 property_table_entry *prop_table,
5427 Elf_Internal_Rela *internal_relocs,
5428 unsigned reloc_count)
5430 memset (ebb, 0, sizeof (ebb_t));
5432 ebb->contents = contents;
5433 ebb->content_length = content_length;
5434 ebb->ptbl = prop_table;
5435 ebb->pte_count = ptblsize;
5436 ebb->relocs = internal_relocs;
5437 ebb->reloc_count = reloc_count;
5438 ebb->start_offset = 0;
5439 ebb->end_offset = ebb->content_length - 1;
5440 ebb->start_ptbl_idx = 0;
5441 ebb->end_ptbl_idx = ptblsize;
5442 ebb->start_reloc_idx = 0;
5443 ebb->end_reloc_idx = reloc_count;
5447 /* Extend the ebb to all decodable contiguous sections. The algorithm
5448 for building a basic block around an instruction is to push it
5449 forward until we hit the end of a section, an unreachable block or
5450 a block that cannot be transformed. Then we push it backwards
5451 searching for similar conditions. */
5453 static bfd_boolean extend_ebb_bounds_forward (ebb_t *);
5454 static bfd_boolean extend_ebb_bounds_backward (ebb_t *);
5455 static bfd_size_type insn_block_decodable_len
5456 (bfd_byte *, bfd_size_type, bfd_vma, bfd_size_type);
5459 extend_ebb_bounds (ebb_t *ebb)
5461 if (!extend_ebb_bounds_forward (ebb))
5463 if (!extend_ebb_bounds_backward (ebb))
5470 extend_ebb_bounds_forward (ebb_t *ebb)
5472 property_table_entry *the_entry, *new_entry;
5474 the_entry = &ebb->ptbl[ebb->end_ptbl_idx];
5476 /* Stop when (1) we cannot decode an instruction, (2) we are at
5477 the end of the property tables, (3) we hit a non-contiguous property
5478 table entry, (4) we hit a NO_TRANSFORM region. */
5483 bfd_size_type insn_block_len;
5485 entry_end = the_entry->address - ebb->sec->vma + the_entry->size;
5487 insn_block_decodable_len (ebb->contents, ebb->content_length,
5489 entry_end - ebb->end_offset);
5490 if (insn_block_len != (entry_end - ebb->end_offset))
5492 (*_bfd_error_handler)
5493 (_("%B(%A+0x%lx): could not decode instruction; possible configuration mismatch"),
5494 ebb->sec->owner, ebb->sec, ebb->end_offset + insn_block_len);
5497 ebb->end_offset += insn_block_len;
5499 if (ebb->end_offset == ebb->sec->size)
5500 ebb->ends_section = TRUE;
5502 /* Update the reloc counter. */
5503 while (ebb->end_reloc_idx + 1 < ebb->reloc_count
5504 && (ebb->relocs[ebb->end_reloc_idx + 1].r_offset
5507 ebb->end_reloc_idx++;
5510 if (ebb->end_ptbl_idx + 1 == ebb->pte_count)
5513 new_entry = &ebb->ptbl[ebb->end_ptbl_idx + 1];
5514 if (((new_entry->flags & XTENSA_PROP_INSN) == 0)
5515 || ((new_entry->flags & XTENSA_PROP_NO_TRANSFORM) != 0)
5516 || ((the_entry->flags & XTENSA_PROP_ALIGN) != 0))
5519 if (the_entry->address + the_entry->size != new_entry->address)
5522 the_entry = new_entry;
5523 ebb->end_ptbl_idx++;
5526 /* Quick check for an unreachable or end of file just at the end. */
5527 if (ebb->end_ptbl_idx + 1 == ebb->pte_count)
5529 if (ebb->end_offset == ebb->content_length)
5530 ebb->ends_section = TRUE;
5534 new_entry = &ebb->ptbl[ebb->end_ptbl_idx + 1];
5535 if ((new_entry->flags & XTENSA_PROP_UNREACHABLE) != 0
5536 && the_entry->address + the_entry->size == new_entry->address)
5537 ebb->ends_unreachable = new_entry;
5540 /* Any other ending requires exact alignment. */
5546 extend_ebb_bounds_backward (ebb_t *ebb)
5548 property_table_entry *the_entry, *new_entry;
5550 the_entry = &ebb->ptbl[ebb->start_ptbl_idx];
5552 /* Stop when (1) we cannot decode the instructions in the current entry.
5553 (2) we are at the beginning of the property tables, (3) we hit a
5554 non-contiguous property table entry, (4) we hit a NO_TRANSFORM region. */
5558 bfd_vma block_begin;
5559 bfd_size_type insn_block_len;
5561 block_begin = the_entry->address - ebb->sec->vma;
5563 insn_block_decodable_len (ebb->contents, ebb->content_length,
5565 ebb->start_offset - block_begin);
5566 if (insn_block_len != ebb->start_offset - block_begin)
5568 (*_bfd_error_handler)
5569 (_("%B(%A+0x%lx): could not decode instruction; possible configuration mismatch"),
5570 ebb->sec->owner, ebb->sec, ebb->end_offset + insn_block_len);
5573 ebb->start_offset -= insn_block_len;
5575 /* Update the reloc counter. */
5576 while (ebb->start_reloc_idx > 0
5577 && (ebb->relocs[ebb->start_reloc_idx - 1].r_offset
5578 >= ebb->start_offset))
5580 ebb->start_reloc_idx--;
5583 if (ebb->start_ptbl_idx == 0)
5586 new_entry = &ebb->ptbl[ebb->start_ptbl_idx - 1];
5587 if ((new_entry->flags & XTENSA_PROP_INSN) == 0
5588 || ((new_entry->flags & XTENSA_PROP_NO_TRANSFORM) != 0)
5589 || ((new_entry->flags & XTENSA_PROP_ALIGN) != 0))
5591 if (new_entry->address + new_entry->size != the_entry->address)
5594 the_entry = new_entry;
5595 ebb->start_ptbl_idx--;
5601 static bfd_size_type
5602 insn_block_decodable_len (bfd_byte *contents,
5603 bfd_size_type content_len,
5604 bfd_vma block_offset,
5605 bfd_size_type block_len)
5607 bfd_vma offset = block_offset;
5609 while (offset < block_offset + block_len)
5611 bfd_size_type insn_len = 0;
5613 insn_len = insn_decode_len (contents, content_len, offset);
5615 return (offset - block_offset);
5618 return (offset - block_offset);
5623 ebb_propose_action (ebb_constraint *c,
5624 enum ebb_target_enum align_type,
5625 bfd_vma alignment_pow,
5626 text_action_t action,
5629 bfd_boolean do_action)
5631 proposed_action *act;
5633 if (c->action_allocated <= c->action_count)
5635 unsigned new_allocated, i;
5636 proposed_action *new_actions;
5638 new_allocated = (c->action_count + 2) * 2;
5639 new_actions = (proposed_action *)
5640 bfd_zmalloc (sizeof (proposed_action) * new_allocated);
5642 for (i = 0; i < c->action_count; i++)
5643 new_actions[i] = c->actions[i];
5646 c->actions = new_actions;
5647 c->action_allocated = new_allocated;
5650 act = &c->actions[c->action_count];
5651 act->align_type = align_type;
5652 act->alignment_pow = alignment_pow;
5653 act->action = action;
5654 act->offset = offset;
5655 act->removed_bytes = removed_bytes;
5656 act->do_action = do_action;
5662 /* Access to internal relocations, section contents and symbols. */
5664 /* During relaxation, we need to modify relocations, section contents,
5665 and symbol definitions, and we need to keep the original values from
5666 being reloaded from the input files, i.e., we need to "pin" the
5667 modified values in memory. We also want to continue to observe the
5668 setting of the "keep-memory" flag. The following functions wrap the
5669 standard BFD functions to take care of this for us. */
5671 static Elf_Internal_Rela *
5672 retrieve_internal_relocs (bfd *abfd, asection *sec, bfd_boolean keep_memory)
5674 Elf_Internal_Rela *internal_relocs;
5676 if ((sec->flags & SEC_LINKER_CREATED) != 0)
5679 internal_relocs = elf_section_data (sec)->relocs;
5680 if (internal_relocs == NULL)
5681 internal_relocs = (_bfd_elf_link_read_relocs
5682 (abfd, sec, NULL, NULL, keep_memory));
5683 return internal_relocs;
5688 pin_internal_relocs (asection *sec, Elf_Internal_Rela *internal_relocs)
5690 elf_section_data (sec)->relocs = internal_relocs;
5695 release_internal_relocs (asection *sec, Elf_Internal_Rela *internal_relocs)
5698 && elf_section_data (sec)->relocs != internal_relocs)
5699 free (internal_relocs);
5704 retrieve_contents (bfd *abfd, asection *sec, bfd_boolean keep_memory)
5707 bfd_size_type sec_size;
5709 sec_size = bfd_get_section_limit (abfd, sec);
5710 contents = elf_section_data (sec)->this_hdr.contents;
5712 if (contents == NULL && sec_size != 0)
5714 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
5721 elf_section_data (sec)->this_hdr.contents = contents;
5728 pin_contents (asection *sec, bfd_byte *contents)
5730 elf_section_data (sec)->this_hdr.contents = contents;
5735 release_contents (asection *sec, bfd_byte *contents)
5737 if (contents && elf_section_data (sec)->this_hdr.contents != contents)
5742 static Elf_Internal_Sym *
5743 retrieve_local_syms (bfd *input_bfd)
5745 Elf_Internal_Shdr *symtab_hdr;
5746 Elf_Internal_Sym *isymbuf;
5749 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
5750 locsymcount = symtab_hdr->sh_info;
5752 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
5753 if (isymbuf == NULL && locsymcount != 0)
5754 isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, locsymcount, 0,
5757 /* Save the symbols for this input file so they won't be read again. */
5758 if (isymbuf && isymbuf != (Elf_Internal_Sym *) symtab_hdr->contents)
5759 symtab_hdr->contents = (unsigned char *) isymbuf;
5765 /* Code for link-time relaxation. */
5767 /* Initialization for relaxation: */
5768 static bfd_boolean analyze_relocations (struct bfd_link_info *);
5769 static bfd_boolean find_relaxable_sections
5770 (bfd *, asection *, struct bfd_link_info *, bfd_boolean *);
5771 static bfd_boolean collect_source_relocs
5772 (bfd *, asection *, struct bfd_link_info *);
5773 static bfd_boolean is_resolvable_asm_expansion
5774 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, struct bfd_link_info *,
5776 static Elf_Internal_Rela *find_associated_l32r_irel
5777 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, Elf_Internal_Rela *);
5778 static bfd_boolean compute_text_actions
5779 (bfd *, asection *, struct bfd_link_info *);
5780 static bfd_boolean compute_ebb_proposed_actions (ebb_constraint *);
5781 static bfd_boolean compute_ebb_actions (ebb_constraint *);
5782 static bfd_boolean check_section_ebb_pcrels_fit
5783 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, const ebb_constraint *,
5784 const xtensa_opcode *);
5785 static bfd_boolean check_section_ebb_reduces (const ebb_constraint *);
5786 static void text_action_add_proposed
5787 (text_action_list *, const ebb_constraint *, asection *);
5788 static int compute_fill_extra_space (property_table_entry *);
5791 static bfd_boolean compute_removed_literals
5792 (bfd *, asection *, struct bfd_link_info *, value_map_hash_table *);
5793 static Elf_Internal_Rela *get_irel_at_offset
5794 (asection *, Elf_Internal_Rela *, bfd_vma);
5795 static bfd_boolean is_removable_literal
5796 (const source_reloc *, int, const source_reloc *, int, asection *,
5797 property_table_entry *, int);
5798 static bfd_boolean remove_dead_literal
5799 (bfd *, asection *, struct bfd_link_info *, Elf_Internal_Rela *,
5800 Elf_Internal_Rela *, source_reloc *, property_table_entry *, int);
5801 static bfd_boolean identify_literal_placement
5802 (bfd *, asection *, bfd_byte *, struct bfd_link_info *,
5803 value_map_hash_table *, bfd_boolean *, Elf_Internal_Rela *, int,
5804 source_reloc *, property_table_entry *, int, section_cache_t *,
5806 static bfd_boolean relocations_reach (source_reloc *, int, const r_reloc *);
5807 static bfd_boolean coalesce_shared_literal
5808 (asection *, source_reloc *, property_table_entry *, int, value_map *);
5809 static bfd_boolean move_shared_literal
5810 (asection *, struct bfd_link_info *, source_reloc *, property_table_entry *,
5811 int, const r_reloc *, const literal_value *, section_cache_t *);
5814 static bfd_boolean relax_section (bfd *, asection *, struct bfd_link_info *);
5815 static bfd_boolean translate_section_fixes (asection *);
5816 static bfd_boolean translate_reloc_bfd_fix (reloc_bfd_fix *);
5817 static asection *translate_reloc (const r_reloc *, r_reloc *, asection *);
5818 static void shrink_dynamic_reloc_sections
5819 (struct bfd_link_info *, bfd *, asection *, Elf_Internal_Rela *);
5820 static bfd_boolean move_literal
5821 (bfd *, struct bfd_link_info *, asection *, bfd_vma, bfd_byte *,
5822 xtensa_relax_info *, Elf_Internal_Rela **, const literal_value *);
5823 static bfd_boolean relax_property_section
5824 (bfd *, asection *, struct bfd_link_info *);
5827 static bfd_boolean relax_section_symbols (bfd *, asection *);
5831 elf_xtensa_relax_section (bfd *abfd,
5833 struct bfd_link_info *link_info,
5836 static value_map_hash_table *values = NULL;
5837 static bfd_boolean relocations_analyzed = FALSE;
5838 xtensa_relax_info *relax_info;
5840 if (!relocations_analyzed)
5842 /* Do some overall initialization for relaxation. */
5843 values = value_map_hash_table_init ();
5846 relaxing_section = TRUE;
5847 if (!analyze_relocations (link_info))
5849 relocations_analyzed = TRUE;
5853 /* Don't mess with linker-created sections. */
5854 if ((sec->flags & SEC_LINKER_CREATED) != 0)
5857 relax_info = get_xtensa_relax_info (sec);
5858 BFD_ASSERT (relax_info != NULL);
5860 switch (relax_info->visited)
5863 /* Note: It would be nice to fold this pass into
5864 analyze_relocations, but it is important for this step that the
5865 sections be examined in link order. */
5866 if (!compute_removed_literals (abfd, sec, link_info, values))
5873 value_map_hash_table_delete (values);
5875 if (!relax_section (abfd, sec, link_info))
5881 if (!relax_section_symbols (abfd, sec))
5886 relax_info->visited++;
5891 /* Initialization for relaxation. */
5893 /* This function is called once at the start of relaxation. It scans
5894 all the input sections and marks the ones that are relaxable (i.e.,
5895 literal sections with L32R relocations against them), and then
5896 collects source_reloc information for all the relocations against
5897 those relaxable sections. During this process, it also detects
5898 longcalls, i.e., calls relaxed by the assembler into indirect
5899 calls, that can be optimized back into direct calls. Within each
5900 extended basic block (ebb) containing an optimized longcall, it
5901 computes a set of "text actions" that can be performed to remove
5902 the L32R associated with the longcall while optionally preserving
5903 branch target alignments. */
5906 analyze_relocations (struct bfd_link_info *link_info)
5910 bfd_boolean is_relaxable = FALSE;
5912 /* Initialize the per-section relaxation info. */
5913 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next)
5914 for (sec = abfd->sections; sec != NULL; sec = sec->next)
5916 init_xtensa_relax_info (sec);
5919 /* Mark relaxable sections (and count relocations against each one). */
5920 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next)
5921 for (sec = abfd->sections; sec != NULL; sec = sec->next)
5923 if (!find_relaxable_sections (abfd, sec, link_info, &is_relaxable))
5927 /* Bail out if there are no relaxable sections. */
5931 /* Allocate space for source_relocs. */
5932 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next)
5933 for (sec = abfd->sections; sec != NULL; sec = sec->next)
5935 xtensa_relax_info *relax_info;
5937 relax_info = get_xtensa_relax_info (sec);
5938 if (relax_info->is_relaxable_literal_section
5939 || relax_info->is_relaxable_asm_section)
5941 relax_info->src_relocs = (source_reloc *)
5942 bfd_malloc (relax_info->src_count * sizeof (source_reloc));
5945 relax_info->src_count = 0;
5948 /* Collect info on relocations against each relaxable section. */
5949 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next)
5950 for (sec = abfd->sections; sec != NULL; sec = sec->next)
5952 if (!collect_source_relocs (abfd, sec, link_info))
5956 /* Compute the text actions. */
5957 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next)
5958 for (sec = abfd->sections; sec != NULL; sec = sec->next)
5960 if (!compute_text_actions (abfd, sec, link_info))
5968 /* Find all the sections that might be relaxed. The motivation for
5969 this pass is that collect_source_relocs() needs to record _all_ the
5970 relocations that target each relaxable section. That is expensive
5971 and unnecessary unless the target section is actually going to be
5972 relaxed. This pass identifies all such sections by checking if
5973 they have L32Rs pointing to them. In the process, the total number
5974 of relocations targeting each section is also counted so that we
5975 know how much space to allocate for source_relocs against each
5976 relaxable literal section. */
5979 find_relaxable_sections (bfd *abfd,
5981 struct bfd_link_info *link_info,
5982 bfd_boolean *is_relaxable_p)
5984 Elf_Internal_Rela *internal_relocs;
5986 bfd_boolean ok = TRUE;
5988 xtensa_relax_info *source_relax_info;
5989 bfd_boolean is_l32r_reloc;
5991 internal_relocs = retrieve_internal_relocs (abfd, sec,
5992 link_info->keep_memory);
5993 if (internal_relocs == NULL)
5996 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
5997 if (contents == NULL && sec->size != 0)
6003 source_relax_info = get_xtensa_relax_info (sec);
6004 for (i = 0; i < sec->reloc_count; i++)
6006 Elf_Internal_Rela *irel = &internal_relocs[i];
6008 asection *target_sec;
6009 xtensa_relax_info *target_relax_info;
6011 /* If this section has not already been marked as "relaxable", and
6012 if it contains any ASM_EXPAND relocations (marking expanded
6013 longcalls) that can be optimized into direct calls, then mark
6014 the section as "relaxable". */
6015 if (source_relax_info
6016 && !source_relax_info->is_relaxable_asm_section
6017 && ELF32_R_TYPE (irel->r_info) == R_XTENSA_ASM_EXPAND)
6019 bfd_boolean is_reachable = FALSE;
6020 if (is_resolvable_asm_expansion (abfd, sec, contents, irel,
6021 link_info, &is_reachable)
6024 source_relax_info->is_relaxable_asm_section = TRUE;
6025 *is_relaxable_p = TRUE;
6029 r_reloc_init (&r_rel, abfd, irel, contents,
6030 bfd_get_section_limit (abfd, sec));
6032 target_sec = r_reloc_get_section (&r_rel);
6033 target_relax_info = get_xtensa_relax_info (target_sec);
6034 if (!target_relax_info)
6037 /* Count PC-relative operand relocations against the target section.
6038 Note: The conditions tested here must match the conditions under
6039 which init_source_reloc is called in collect_source_relocs(). */
6040 is_l32r_reloc = FALSE;
6041 if (is_operand_relocation (ELF32_R_TYPE (irel->r_info)))
6043 xtensa_opcode opcode =
6044 get_relocation_opcode (abfd, sec, contents, irel);
6045 if (opcode != XTENSA_UNDEFINED)
6047 is_l32r_reloc = (opcode == get_l32r_opcode ());
6048 if (!is_alt_relocation (ELF32_R_TYPE (irel->r_info))
6050 target_relax_info->src_count++;
6054 if (is_l32r_reloc && r_reloc_is_defined (&r_rel))
6056 /* Mark the target section as relaxable. */
6057 target_relax_info->is_relaxable_literal_section = TRUE;
6058 *is_relaxable_p = TRUE;
6063 release_contents (sec, contents);
6064 release_internal_relocs (sec, internal_relocs);
6069 /* Record _all_ the relocations that point to relaxable sections, and
6070 get rid of ASM_EXPAND relocs by either converting them to
6071 ASM_SIMPLIFY or by removing them. */
6074 collect_source_relocs (bfd *abfd,
6076 struct bfd_link_info *link_info)
6078 Elf_Internal_Rela *internal_relocs;
6080 bfd_boolean ok = TRUE;
6082 bfd_size_type sec_size;
6084 internal_relocs = retrieve_internal_relocs (abfd, sec,
6085 link_info->keep_memory);
6086 if (internal_relocs == NULL)
6089 sec_size = bfd_get_section_limit (abfd, sec);
6090 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
6091 if (contents == NULL && sec_size != 0)
6097 /* Record relocations against relaxable literal sections. */
6098 for (i = 0; i < sec->reloc_count; i++)
6100 Elf_Internal_Rela *irel = &internal_relocs[i];
6102 asection *target_sec;
6103 xtensa_relax_info *target_relax_info;
6105 r_reloc_init (&r_rel, abfd, irel, contents, sec_size);
6107 target_sec = r_reloc_get_section (&r_rel);
6108 target_relax_info = get_xtensa_relax_info (target_sec);
6110 if (target_relax_info
6111 && (target_relax_info->is_relaxable_literal_section
6112 || target_relax_info->is_relaxable_asm_section))
6114 xtensa_opcode opcode = XTENSA_UNDEFINED;
6116 bfd_boolean is_abs_literal = FALSE;
6118 if (is_alt_relocation (ELF32_R_TYPE (irel->r_info)))
6120 /* None of the current alternate relocs are PC-relative,
6121 and only PC-relative relocs matter here. However, we
6122 still need to record the opcode for literal
6124 opcode = get_relocation_opcode (abfd, sec, contents, irel);
6125 if (opcode == get_l32r_opcode ())
6127 is_abs_literal = TRUE;
6131 opcode = XTENSA_UNDEFINED;
6133 else if (is_operand_relocation (ELF32_R_TYPE (irel->r_info)))
6135 opcode = get_relocation_opcode (abfd, sec, contents, irel);
6136 opnd = get_relocation_opnd (opcode, ELF32_R_TYPE (irel->r_info));
6139 if (opcode != XTENSA_UNDEFINED)
6141 int src_next = target_relax_info->src_next++;
6142 source_reloc *s_reloc = &target_relax_info->src_relocs[src_next];
6144 init_source_reloc (s_reloc, sec, &r_rel, opcode, opnd,
6150 /* Now get rid of ASM_EXPAND relocations. At this point, the
6151 src_relocs array for the target literal section may still be
6152 incomplete, but it must at least contain the entries for the L32R
6153 relocations associated with ASM_EXPANDs because they were just
6154 added in the preceding loop over the relocations. */
6156 for (i = 0; i < sec->reloc_count; i++)
6158 Elf_Internal_Rela *irel = &internal_relocs[i];
6159 bfd_boolean is_reachable;
6161 if (!is_resolvable_asm_expansion (abfd, sec, contents, irel, link_info,
6167 Elf_Internal_Rela *l32r_irel;
6169 asection *target_sec;
6170 xtensa_relax_info *target_relax_info;
6172 /* Mark the source_reloc for the L32R so that it will be
6173 removed in compute_removed_literals(), along with the
6174 associated literal. */
6175 l32r_irel = find_associated_l32r_irel (abfd, sec, contents,
6176 irel, internal_relocs);
6177 if (l32r_irel == NULL)
6180 r_reloc_init (&r_rel, abfd, l32r_irel, contents, sec_size);
6182 target_sec = r_reloc_get_section (&r_rel);
6183 target_relax_info = get_xtensa_relax_info (target_sec);
6185 if (target_relax_info
6186 && (target_relax_info->is_relaxable_literal_section
6187 || target_relax_info->is_relaxable_asm_section))
6189 source_reloc *s_reloc;
6191 /* Search the source_relocs for the entry corresponding to
6192 the l32r_irel. Note: The src_relocs array is not yet
6193 sorted, but it wouldn't matter anyway because we're
6194 searching by source offset instead of target offset. */
6195 s_reloc = find_source_reloc (target_relax_info->src_relocs,
6196 target_relax_info->src_next,
6198 BFD_ASSERT (s_reloc);
6199 s_reloc->is_null = TRUE;
6202 /* Convert this reloc to ASM_SIMPLIFY. */
6203 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
6204 R_XTENSA_ASM_SIMPLIFY);
6205 l32r_irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
6207 pin_internal_relocs (sec, internal_relocs);
6211 /* It is resolvable but doesn't reach. We resolve now
6212 by eliminating the relocation -- the call will remain
6213 expanded into L32R/CALLX. */
6214 irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
6215 pin_internal_relocs (sec, internal_relocs);
6220 release_contents (sec, contents);
6221 release_internal_relocs (sec, internal_relocs);
6226 /* Return TRUE if the asm expansion can be resolved. Generally it can
6227 be resolved on a final link or when a partial link locates it in the
6228 same section as the target. Set "is_reachable" flag if the target of
6229 the call is within the range of a direct call, given the current VMA
6230 for this section and the target section. */
6233 is_resolvable_asm_expansion (bfd *abfd,
6236 Elf_Internal_Rela *irel,
6237 struct bfd_link_info *link_info,
6238 bfd_boolean *is_reachable_p)
6240 asection *target_sec;
6241 bfd_vma target_offset;
6243 xtensa_opcode opcode, direct_call_opcode;
6244 bfd_vma self_address;
6245 bfd_vma dest_address;
6246 bfd_boolean uses_l32r;
6247 bfd_size_type sec_size;
6249 *is_reachable_p = FALSE;
6251 if (contents == NULL)
6254 if (ELF32_R_TYPE (irel->r_info) != R_XTENSA_ASM_EXPAND)
6257 sec_size = bfd_get_section_limit (abfd, sec);
6258 opcode = get_expanded_call_opcode (contents + irel->r_offset,
6259 sec_size - irel->r_offset, &uses_l32r);
6260 /* Optimization of longcalls that use CONST16 is not yet implemented. */
6264 direct_call_opcode = swap_callx_for_call_opcode (opcode);
6265 if (direct_call_opcode == XTENSA_UNDEFINED)
6268 /* Check and see that the target resolves. */
6269 r_reloc_init (&r_rel, abfd, irel, contents, sec_size);
6270 if (!r_reloc_is_defined (&r_rel))
6273 target_sec = r_reloc_get_section (&r_rel);
6274 target_offset = r_rel.target_offset;
6276 /* If the target is in a shared library, then it doesn't reach. This
6277 isn't supposed to come up because the compiler should never generate
6278 non-PIC calls on systems that use shared libraries, but the linker
6279 shouldn't crash regardless. */
6280 if (!target_sec->output_section)
6283 /* For relocatable sections, we can only simplify when the output
6284 section of the target is the same as the output section of the
6286 if (link_info->relocatable
6287 && (target_sec->output_section != sec->output_section
6288 || is_reloc_sym_weak (abfd, irel)))
6291 self_address = (sec->output_section->vma
6292 + sec->output_offset + irel->r_offset + 3);
6293 dest_address = (target_sec->output_section->vma
6294 + target_sec->output_offset + target_offset);
6296 *is_reachable_p = pcrel_reloc_fits (direct_call_opcode, 0,
6297 self_address, dest_address);
6299 if ((self_address >> CALL_SEGMENT_BITS) !=
6300 (dest_address >> CALL_SEGMENT_BITS))
6307 static Elf_Internal_Rela *
6308 find_associated_l32r_irel (bfd *abfd,
6311 Elf_Internal_Rela *other_irel,
6312 Elf_Internal_Rela *internal_relocs)
6316 for (i = 0; i < sec->reloc_count; i++)
6318 Elf_Internal_Rela *irel = &internal_relocs[i];
6320 if (irel == other_irel)
6322 if (irel->r_offset != other_irel->r_offset)
6324 if (is_l32r_relocation (abfd, sec, contents, irel))
6332 static xtensa_opcode *
6333 build_reloc_opcodes (bfd *abfd,
6336 Elf_Internal_Rela *internal_relocs)
6339 xtensa_opcode *reloc_opcodes =
6340 (xtensa_opcode *) bfd_malloc (sizeof (xtensa_opcode) * sec->reloc_count);
6341 for (i = 0; i < sec->reloc_count; i++)
6343 Elf_Internal_Rela *irel = &internal_relocs[i];
6344 reloc_opcodes[i] = get_relocation_opcode (abfd, sec, contents, irel);
6346 return reloc_opcodes;
6350 /* The compute_text_actions function will build a list of potential
6351 transformation actions for code in the extended basic block of each
6352 longcall that is optimized to a direct call. From this list we
6353 generate a set of actions to actually perform that optimizes for
6354 space and, if not using size_opt, maintains branch target
6357 These actions to be performed are placed on a per-section list.
6358 The actual changes are performed by relax_section() in the second
6362 compute_text_actions (bfd *abfd,
6364 struct bfd_link_info *link_info)
6366 xtensa_opcode *reloc_opcodes = NULL;
6367 xtensa_relax_info *relax_info;
6369 Elf_Internal_Rela *internal_relocs;
6370 bfd_boolean ok = TRUE;
6372 property_table_entry *prop_table = 0;
6374 bfd_size_type sec_size;
6376 relax_info = get_xtensa_relax_info (sec);
6377 BFD_ASSERT (relax_info);
6378 BFD_ASSERT (relax_info->src_next == relax_info->src_count);
6380 /* Do nothing if the section contains no optimized longcalls. */
6381 if (!relax_info->is_relaxable_asm_section)
6384 internal_relocs = retrieve_internal_relocs (abfd, sec,
6385 link_info->keep_memory);
6387 if (internal_relocs)
6388 qsort (internal_relocs, sec->reloc_count, sizeof (Elf_Internal_Rela),
6389 internal_reloc_compare);
6391 sec_size = bfd_get_section_limit (abfd, sec);
6392 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
6393 if (contents == NULL && sec_size != 0)
6399 ptblsize = xtensa_read_table_entries (abfd, sec, &prop_table,
6400 XTENSA_PROP_SEC_NAME, FALSE);
6407 for (i = 0; i < sec->reloc_count; i++)
6409 Elf_Internal_Rela *irel = &internal_relocs[i];
6411 property_table_entry *the_entry;
6414 ebb_constraint ebb_table;
6415 bfd_size_type simplify_size;
6417 if (irel && ELF32_R_TYPE (irel->r_info) != R_XTENSA_ASM_SIMPLIFY)
6419 r_offset = irel->r_offset;
6421 simplify_size = get_asm_simplify_size (contents, sec_size, r_offset);
6422 if (simplify_size == 0)
6424 (*_bfd_error_handler)
6425 (_("%B(%A+0x%lx): could not decode instruction for XTENSA_ASM_SIMPLIFY relocation; possible configuration mismatch"),
6426 sec->owner, sec, r_offset);
6430 /* If the instruction table is not around, then don't do this
6432 the_entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
6433 sec->vma + irel->r_offset);
6434 if (the_entry == NULL || XTENSA_NO_NOP_REMOVAL)
6436 text_action_add (&relax_info->action_list,
6437 ta_convert_longcall, sec, r_offset,
6442 /* If the next longcall happens to be at the same address as an
6443 unreachable section of size 0, then skip forward. */
6444 ptbl_idx = the_entry - prop_table;
6445 while ((the_entry->flags & XTENSA_PROP_UNREACHABLE)
6446 && the_entry->size == 0
6447 && ptbl_idx + 1 < ptblsize
6448 && (prop_table[ptbl_idx + 1].address
6449 == prop_table[ptbl_idx].address))
6455 if (the_entry->flags & XTENSA_PROP_NO_TRANSFORM)
6456 /* NO_REORDER is OK */
6459 init_ebb_constraint (&ebb_table);
6460 ebb = &ebb_table.ebb;
6461 init_ebb (ebb, sec, contents, sec_size, prop_table, ptblsize,
6462 internal_relocs, sec->reloc_count);
6463 ebb->start_offset = r_offset + simplify_size;
6464 ebb->end_offset = r_offset + simplify_size;
6465 ebb->start_ptbl_idx = ptbl_idx;
6466 ebb->end_ptbl_idx = ptbl_idx;
6467 ebb->start_reloc_idx = i;
6468 ebb->end_reloc_idx = i;
6470 /* Precompute the opcode for each relocation. */
6471 if (reloc_opcodes == NULL)
6472 reloc_opcodes = build_reloc_opcodes (abfd, sec, contents,
6475 if (!extend_ebb_bounds (ebb)
6476 || !compute_ebb_proposed_actions (&ebb_table)
6477 || !compute_ebb_actions (&ebb_table)
6478 || !check_section_ebb_pcrels_fit (abfd, sec, contents,
6479 internal_relocs, &ebb_table,
6481 || !check_section_ebb_reduces (&ebb_table))
6483 /* If anything goes wrong or we get unlucky and something does
6484 not fit, with our plan because of expansion between
6485 critical branches, just convert to a NOP. */
6487 text_action_add (&relax_info->action_list,
6488 ta_convert_longcall, sec, r_offset, 0);
6489 i = ebb_table.ebb.end_reloc_idx;
6490 free_ebb_constraint (&ebb_table);
6494 text_action_add_proposed (&relax_info->action_list, &ebb_table, sec);
6496 /* Update the index so we do not go looking at the relocations
6497 we have already processed. */
6498 i = ebb_table.ebb.end_reloc_idx;
6499 free_ebb_constraint (&ebb_table);
6503 if (relax_info->action_list.head)
6504 print_action_list (stderr, &relax_info->action_list);
6508 release_contents (sec, contents);
6509 release_internal_relocs (sec, internal_relocs);
6513 free (reloc_opcodes);
6519 /* Do not widen an instruction if it is preceeded by a
6520 loop opcode. It might cause misalignment. */
6523 prev_instr_is_a_loop (bfd_byte *contents,
6524 bfd_size_type content_length,
6525 bfd_size_type offset)
6527 xtensa_opcode prev_opcode;
6531 prev_opcode = insn_decode_opcode (contents, content_length, offset-3, 0);
6532 return (xtensa_opcode_is_loop (xtensa_default_isa, prev_opcode) == 1);
6536 /* Find all of the possible actions for an extended basic block. */
6539 compute_ebb_proposed_actions (ebb_constraint *ebb_table)
6541 const ebb_t *ebb = &ebb_table->ebb;
6542 unsigned rel_idx = ebb->start_reloc_idx;
6543 property_table_entry *entry, *start_entry, *end_entry;
6545 xtensa_isa isa = xtensa_default_isa;
6547 static xtensa_insnbuf insnbuf = NULL;
6548 static xtensa_insnbuf slotbuf = NULL;
6550 if (insnbuf == NULL)
6552 insnbuf = xtensa_insnbuf_alloc (isa);
6553 slotbuf = xtensa_insnbuf_alloc (isa);
6556 start_entry = &ebb->ptbl[ebb->start_ptbl_idx];
6557 end_entry = &ebb->ptbl[ebb->end_ptbl_idx];
6559 for (entry = start_entry; entry <= end_entry; entry++)
6561 bfd_vma start_offset, end_offset;
6562 bfd_size_type insn_len;
6564 start_offset = entry->address - ebb->sec->vma;
6565 end_offset = entry->address + entry->size - ebb->sec->vma;
6567 if (entry == start_entry)
6568 start_offset = ebb->start_offset;
6569 if (entry == end_entry)
6570 end_offset = ebb->end_offset;
6571 offset = start_offset;
6573 if (offset == entry->address - ebb->sec->vma
6574 && (entry->flags & XTENSA_PROP_INSN_BRANCH_TARGET) != 0)
6576 enum ebb_target_enum align_type = EBB_DESIRE_TGT_ALIGN;
6577 BFD_ASSERT (offset != end_offset);
6578 if (offset == end_offset)
6581 insn_len = insn_decode_len (ebb->contents, ebb->content_length,
6586 if (check_branch_target_aligned_address (offset, insn_len))
6587 align_type = EBB_REQUIRE_TGT_ALIGN;
6589 ebb_propose_action (ebb_table, align_type, 0,
6590 ta_none, offset, 0, TRUE);
6593 while (offset != end_offset)
6595 Elf_Internal_Rela *irel;
6596 xtensa_opcode opcode;
6598 while (rel_idx < ebb->end_reloc_idx
6599 && (ebb->relocs[rel_idx].r_offset < offset
6600 || (ebb->relocs[rel_idx].r_offset == offset
6601 && (ELF32_R_TYPE (ebb->relocs[rel_idx].r_info)
6602 != R_XTENSA_ASM_SIMPLIFY))))
6605 /* Check for longcall. */
6606 irel = &ebb->relocs[rel_idx];
6607 if (irel->r_offset == offset
6608 && ELF32_R_TYPE (irel->r_info) == R_XTENSA_ASM_SIMPLIFY)
6610 bfd_size_type simplify_size;
6612 simplify_size = get_asm_simplify_size (ebb->contents,
6613 ebb->content_length,
6615 if (simplify_size == 0)
6618 ebb_propose_action (ebb_table, EBB_NO_ALIGN, 0,
6619 ta_convert_longcall, offset, 0, TRUE);
6621 offset += simplify_size;
6625 if (offset + MIN_INSN_LENGTH > ebb->content_length)
6627 xtensa_insnbuf_from_chars (isa, insnbuf, &ebb->contents[offset],
6628 ebb->content_length - offset);
6629 fmt = xtensa_format_decode (isa, insnbuf);
6630 if (fmt == XTENSA_UNDEFINED)
6632 insn_len = xtensa_format_length (isa, fmt);
6633 if (insn_len == (bfd_size_type) XTENSA_UNDEFINED)
6636 if (xtensa_format_num_slots (isa, fmt) != 1)
6642 xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf);
6643 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
6644 if (opcode == XTENSA_UNDEFINED)
6647 if ((entry->flags & XTENSA_PROP_INSN_NO_DENSITY) == 0
6648 && (entry->flags & XTENSA_PROP_NO_TRANSFORM) == 0
6649 && can_narrow_instruction (slotbuf, fmt, opcode) != 0)
6651 /* Add an instruction narrow action. */
6652 ebb_propose_action (ebb_table, EBB_NO_ALIGN, 0,
6653 ta_narrow_insn, offset, 0, FALSE);
6655 else if ((entry->flags & XTENSA_PROP_NO_TRANSFORM) == 0
6656 && can_widen_instruction (slotbuf, fmt, opcode) != 0
6657 && ! prev_instr_is_a_loop (ebb->contents,
6658 ebb->content_length, offset))
6660 /* Add an instruction widen action. */
6661 ebb_propose_action (ebb_table, EBB_NO_ALIGN, 0,
6662 ta_widen_insn, offset, 0, FALSE);
6664 else if (xtensa_opcode_is_loop (xtensa_default_isa, opcode) == 1)
6666 /* Check for branch targets. */
6667 ebb_propose_action (ebb_table, EBB_REQUIRE_LOOP_ALIGN, 0,
6668 ta_none, offset, 0, TRUE);
6675 if (ebb->ends_unreachable)
6677 ebb_propose_action (ebb_table, EBB_NO_ALIGN, 0,
6678 ta_fill, ebb->end_offset, 0, TRUE);
6684 (*_bfd_error_handler)
6685 (_("%B(%A+0x%lx): could not decode instruction; possible configuration mismatch"),
6686 ebb->sec->owner, ebb->sec, offset);
6691 /* After all of the information has collected about the
6692 transformations possible in an EBB, compute the appropriate actions
6693 here in compute_ebb_actions. We still must check later to make
6694 sure that the actions do not break any relocations. The algorithm
6695 used here is pretty greedy. Basically, it removes as many no-ops
6696 as possible so that the end of the EBB has the same alignment
6697 characteristics as the original. First, it uses narrowing, then
6698 fill space at the end of the EBB, and finally widenings. If that
6699 does not work, it tries again with one fewer no-op removed. The
6700 optimization will only be performed if all of the branch targets
6701 that were aligned before transformation are also aligned after the
6704 When the size_opt flag is set, ignore the branch target alignments,
6705 narrow all wide instructions, and remove all no-ops unless the end
6706 of the EBB prevents it. */
6709 compute_ebb_actions (ebb_constraint *ebb_table)
6713 int removed_bytes = 0;
6714 ebb_t *ebb = &ebb_table->ebb;
6715 unsigned seg_idx_start = 0;
6716 unsigned seg_idx_end = 0;
6718 /* We perform this like the assembler relaxation algorithm: Start by
6719 assuming all instructions are narrow and all no-ops removed; then
6722 /* For each segment of this that has a solid constraint, check to
6723 see if there are any combinations that will keep the constraint.
6725 for (seg_idx_end = 0; seg_idx_end < ebb_table->action_count; seg_idx_end++)
6727 bfd_boolean requires_text_end_align = FALSE;
6728 unsigned longcall_count = 0;
6729 unsigned longcall_convert_count = 0;
6730 unsigned narrowable_count = 0;
6731 unsigned narrowable_convert_count = 0;
6732 unsigned widenable_count = 0;
6733 unsigned widenable_convert_count = 0;
6735 proposed_action *action = NULL;
6736 int align = (1 << ebb_table->ebb.sec->alignment_power);
6738 seg_idx_start = seg_idx_end;
6740 for (i = seg_idx_start; i < ebb_table->action_count; i++)
6742 action = &ebb_table->actions[i];
6743 if (action->action == ta_convert_longcall)
6745 if (action->action == ta_narrow_insn)
6747 if (action->action == ta_widen_insn)
6749 if (action->action == ta_fill)
6751 if (action->align_type == EBB_REQUIRE_LOOP_ALIGN)
6753 if (action->align_type == EBB_REQUIRE_TGT_ALIGN
6754 && !elf32xtensa_size_opt)
6759 if (seg_idx_end == ebb_table->action_count && !ebb->ends_unreachable)
6760 requires_text_end_align = TRUE;
6762 if (elf32xtensa_size_opt && !requires_text_end_align
6763 && action->align_type != EBB_REQUIRE_LOOP_ALIGN
6764 && action->align_type != EBB_REQUIRE_TGT_ALIGN)
6766 longcall_convert_count = longcall_count;
6767 narrowable_convert_count = narrowable_count;
6768 widenable_convert_count = 0;
6772 /* There is a constraint. Convert the max number of longcalls. */
6773 narrowable_convert_count = 0;
6774 longcall_convert_count = 0;
6775 widenable_convert_count = 0;
6777 for (j = 0; j < longcall_count; j++)
6779 int removed = (longcall_count - j) * 3 & (align - 1);
6780 unsigned desire_narrow = (align - removed) & (align - 1);
6781 unsigned desire_widen = removed;
6782 if (desire_narrow <= narrowable_count)
6784 narrowable_convert_count = desire_narrow;
6785 narrowable_convert_count +=
6786 (align * ((narrowable_count - narrowable_convert_count)
6788 longcall_convert_count = (longcall_count - j);
6789 widenable_convert_count = 0;
6792 if (desire_widen <= widenable_count && !elf32xtensa_size_opt)
6794 narrowable_convert_count = 0;
6795 longcall_convert_count = longcall_count - j;
6796 widenable_convert_count = desire_widen;
6802 /* Now the number of conversions are saved. Do them. */
6803 for (i = seg_idx_start; i < seg_idx_end; i++)
6805 action = &ebb_table->actions[i];
6806 switch (action->action)
6808 case ta_convert_longcall:
6809 if (longcall_convert_count != 0)
6811 action->action = ta_remove_longcall;
6812 action->do_action = TRUE;
6813 action->removed_bytes += 3;
6814 longcall_convert_count--;
6817 case ta_narrow_insn:
6818 if (narrowable_convert_count != 0)
6820 action->do_action = TRUE;
6821 action->removed_bytes += 1;
6822 narrowable_convert_count--;
6826 if (widenable_convert_count != 0)
6828 action->do_action = TRUE;
6829 action->removed_bytes -= 1;
6830 widenable_convert_count--;
6839 /* Now we move on to some local opts. Try to remove each of the
6840 remaining longcalls. */
6842 if (ebb_table->ebb.ends_section || ebb_table->ebb.ends_unreachable)
6845 for (i = 0; i < ebb_table->action_count; i++)
6847 int old_removed_bytes = removed_bytes;
6848 proposed_action *action = &ebb_table->actions[i];
6850 if (action->do_action && action->action == ta_convert_longcall)
6852 bfd_boolean bad_alignment = FALSE;
6854 for (j = i + 1; j < ebb_table->action_count; j++)
6856 proposed_action *new_action = &ebb_table->actions[j];
6857 bfd_vma offset = new_action->offset;
6858 if (new_action->align_type == EBB_REQUIRE_TGT_ALIGN)
6860 if (!check_branch_target_aligned
6861 (ebb_table->ebb.contents,
6862 ebb_table->ebb.content_length,
6863 offset, offset - removed_bytes))
6865 bad_alignment = TRUE;
6869 if (new_action->align_type == EBB_REQUIRE_LOOP_ALIGN)
6871 if (!check_loop_aligned (ebb_table->ebb.contents,
6872 ebb_table->ebb.content_length,
6874 offset - removed_bytes))
6876 bad_alignment = TRUE;
6880 if (new_action->action == ta_narrow_insn
6881 && !new_action->do_action
6882 && ebb_table->ebb.sec->alignment_power == 2)
6884 /* Narrow an instruction and we are done. */
6885 new_action->do_action = TRUE;
6886 new_action->removed_bytes += 1;
6887 bad_alignment = FALSE;
6890 if (new_action->action == ta_widen_insn
6891 && new_action->do_action
6892 && ebb_table->ebb.sec->alignment_power == 2)
6894 /* Narrow an instruction and we are done. */
6895 new_action->do_action = FALSE;
6896 new_action->removed_bytes += 1;
6897 bad_alignment = FALSE;
6900 if (new_action->do_action)
6901 removed_bytes += new_action->removed_bytes;
6905 action->removed_bytes += 3;
6906 action->action = ta_remove_longcall;
6907 action->do_action = TRUE;
6910 removed_bytes = old_removed_bytes;
6911 if (action->do_action)
6912 removed_bytes += action->removed_bytes;
6917 for (i = 0; i < ebb_table->action_count; ++i)
6919 proposed_action *action = &ebb_table->actions[i];
6920 if (action->do_action)
6921 removed_bytes += action->removed_bytes;
6924 if ((removed_bytes % (1 << ebb_table->ebb.sec->alignment_power)) != 0
6925 && ebb->ends_unreachable)
6927 proposed_action *action;
6931 BFD_ASSERT (ebb_table->action_count != 0);
6932 action = &ebb_table->actions[ebb_table->action_count - 1];
6933 BFD_ASSERT (action->action == ta_fill);
6934 BFD_ASSERT (ebb->ends_unreachable->flags & XTENSA_PROP_UNREACHABLE);
6936 extra_space = compute_fill_extra_space (ebb->ends_unreachable);
6937 br = action->removed_bytes + removed_bytes + extra_space;
6938 br = br & ((1 << ebb->sec->alignment_power ) - 1);
6940 action->removed_bytes = extra_space - br;
6946 /* The xlate_map is a sorted array of address mappings designed to
6947 answer the offset_with_removed_text() query with a binary search instead
6948 of a linear search through the section's action_list. */
6950 typedef struct xlate_map_entry xlate_map_entry_t;
6951 typedef struct xlate_map xlate_map_t;
6953 struct xlate_map_entry
6955 unsigned orig_address;
6956 unsigned new_address;
6962 unsigned entry_count;
6963 xlate_map_entry_t *entry;
6968 xlate_compare (const void *a_v, const void *b_v)
6970 const xlate_map_entry_t *a = (const xlate_map_entry_t *) a_v;
6971 const xlate_map_entry_t *b = (const xlate_map_entry_t *) b_v;
6972 if (a->orig_address < b->orig_address)
6974 if (a->orig_address > (b->orig_address + b->size - 1))
6981 xlate_offset_with_removed_text (const xlate_map_t *map,
6982 text_action_list *action_list,
6985 xlate_map_entry_t tmp;
6987 xlate_map_entry_t *e;
6990 return offset_with_removed_text (action_list, offset);
6992 if (map->entry_count == 0)
6995 tmp.orig_address = offset;
6996 tmp.new_address = offset;
6999 r = bsearch (&offset, map->entry, map->entry_count,
7000 sizeof (xlate_map_entry_t), &xlate_compare);
7001 e = (xlate_map_entry_t *) r;
7003 BFD_ASSERT (e != NULL);
7006 return e->new_address - e->orig_address + offset;
7010 /* Build a binary searchable offset translation map from a section's
7013 static xlate_map_t *
7014 build_xlate_map (asection *sec, xtensa_relax_info *relax_info)
7016 xlate_map_t *map = (xlate_map_t *) bfd_malloc (sizeof (xlate_map_t));
7017 text_action_list *action_list = &relax_info->action_list;
7018 unsigned num_actions = 0;
7021 xlate_map_entry_t *current_entry;
7026 num_actions = action_list_count (action_list);
7027 map->entry = (xlate_map_entry_t *)
7028 bfd_malloc (sizeof (xlate_map_entry_t) * (num_actions + 1));
7029 if (map->entry == NULL)
7034 map->entry_count = 0;
7037 current_entry = &map->entry[0];
7039 current_entry->orig_address = 0;
7040 current_entry->new_address = 0;
7041 current_entry->size = 0;
7043 for (r = action_list->head; r != NULL; r = r->next)
7045 unsigned orig_size = 0;
7049 case ta_remove_insn:
7050 case ta_convert_longcall:
7051 case ta_remove_literal:
7052 case ta_add_literal:
7054 case ta_remove_longcall:
7057 case ta_narrow_insn:
7066 current_entry->size =
7067 r->offset + orig_size - current_entry->orig_address;
7068 if (current_entry->size != 0)
7073 current_entry->orig_address = r->offset + orig_size;
7074 removed += r->removed_bytes;
7075 current_entry->new_address = r->offset + orig_size - removed;
7076 current_entry->size = 0;
7079 current_entry->size = (bfd_get_section_limit (sec->owner, sec)
7080 - current_entry->orig_address);
7081 if (current_entry->size != 0)
7088 /* Free an offset translation map. */
7091 free_xlate_map (xlate_map_t *map)
7093 if (map && map->entry)
7100 /* Use check_section_ebb_pcrels_fit to make sure that all of the
7101 relocations in a section will fit if a proposed set of actions
7105 check_section_ebb_pcrels_fit (bfd *abfd,
7108 Elf_Internal_Rela *internal_relocs,
7109 const ebb_constraint *constraint,
7110 const xtensa_opcode *reloc_opcodes)
7113 Elf_Internal_Rela *irel;
7114 xlate_map_t *xmap = NULL;
7115 bfd_boolean ok = TRUE;
7116 xtensa_relax_info *relax_info;
7118 relax_info = get_xtensa_relax_info (sec);
7120 if (relax_info && sec->reloc_count > 100)
7122 xmap = build_xlate_map (sec, relax_info);
7123 /* NULL indicates out of memory, but the slow version
7124 can still be used. */
7127 for (i = 0; i < sec->reloc_count; i++)
7130 bfd_vma orig_self_offset, orig_target_offset;
7131 bfd_vma self_offset, target_offset;
7133 reloc_howto_type *howto;
7134 int self_removed_bytes, target_removed_bytes;
7136 irel = &internal_relocs[i];
7137 r_type = ELF32_R_TYPE (irel->r_info);
7139 howto = &elf_howto_table[r_type];
7140 /* We maintain the required invariant: PC-relative relocations
7141 that fit before linking must fit after linking. Thus we only
7142 need to deal with relocations to the same section that are
7144 if (r_type == R_XTENSA_ASM_SIMPLIFY
7145 || r_type == R_XTENSA_32_PCREL
7146 || !howto->pc_relative)
7149 r_reloc_init (&r_rel, abfd, irel, contents,
7150 bfd_get_section_limit (abfd, sec));
7152 if (r_reloc_get_section (&r_rel) != sec)
7155 orig_self_offset = irel->r_offset;
7156 orig_target_offset = r_rel.target_offset;
7158 self_offset = orig_self_offset;
7159 target_offset = orig_target_offset;
7164 xlate_offset_with_removed_text (xmap, &relax_info->action_list,
7167 xlate_offset_with_removed_text (xmap, &relax_info->action_list,
7168 orig_target_offset);
7171 self_removed_bytes = 0;
7172 target_removed_bytes = 0;
7174 for (j = 0; j < constraint->action_count; ++j)
7176 proposed_action *action = &constraint->actions[j];
7177 bfd_vma offset = action->offset;
7178 int removed_bytes = action->removed_bytes;
7179 if (offset < orig_self_offset
7180 || (offset == orig_self_offset && action->action == ta_fill
7181 && action->removed_bytes < 0))
7182 self_removed_bytes += removed_bytes;
7183 if (offset < orig_target_offset
7184 || (offset == orig_target_offset && action->action == ta_fill
7185 && action->removed_bytes < 0))
7186 target_removed_bytes += removed_bytes;
7188 self_offset -= self_removed_bytes;
7189 target_offset -= target_removed_bytes;
7191 /* Try to encode it. Get the operand and check. */
7192 if (is_alt_relocation (ELF32_R_TYPE (irel->r_info)))
7194 /* None of the current alternate relocs are PC-relative,
7195 and only PC-relative relocs matter here. */
7199 xtensa_opcode opcode;
7203 opcode = reloc_opcodes[i];
7205 opcode = get_relocation_opcode (abfd, sec, contents, irel);
7206 if (opcode == XTENSA_UNDEFINED)
7212 opnum = get_relocation_opnd (opcode, ELF32_R_TYPE (irel->r_info));
7213 if (opnum == XTENSA_UNDEFINED)
7219 if (!pcrel_reloc_fits (opcode, opnum, self_offset, target_offset))
7228 free_xlate_map (xmap);
7235 check_section_ebb_reduces (const ebb_constraint *constraint)
7240 for (i = 0; i < constraint->action_count; i++)
7242 const proposed_action *action = &constraint->actions[i];
7243 if (action->do_action)
7244 removed += action->removed_bytes;
7254 text_action_add_proposed (text_action_list *l,
7255 const ebb_constraint *ebb_table,
7260 for (i = 0; i < ebb_table->action_count; i++)
7262 proposed_action *action = &ebb_table->actions[i];
7264 if (!action->do_action)
7266 switch (action->action)
7268 case ta_remove_insn:
7269 case ta_remove_longcall:
7270 case ta_convert_longcall:
7271 case ta_narrow_insn:
7274 case ta_remove_literal:
7275 text_action_add (l, action->action, sec, action->offset,
7276 action->removed_bytes);
7289 compute_fill_extra_space (property_table_entry *entry)
7291 int fill_extra_space;
7296 if ((entry->flags & XTENSA_PROP_UNREACHABLE) == 0)
7299 fill_extra_space = entry->size;
7300 if ((entry->flags & XTENSA_PROP_ALIGN) != 0)
7302 /* Fill bytes for alignment:
7303 (2**n)-1 - (addr + (2**n)-1) & (2**n -1) */
7304 int pow = GET_XTENSA_PROP_ALIGNMENT (entry->flags);
7305 int nsm = (1 << pow) - 1;
7306 bfd_vma addr = entry->address + entry->size;
7307 bfd_vma align_fill = nsm - ((addr + nsm) & nsm);
7308 fill_extra_space += align_fill;
7310 return fill_extra_space;
7314 /* First relaxation pass. */
7316 /* If the section contains relaxable literals, check each literal to
7317 see if it has the same value as another literal that has already
7318 been seen, either in the current section or a previous one. If so,
7319 add an entry to the per-section list of removed literals. The
7320 actual changes are deferred until the next pass. */
7323 compute_removed_literals (bfd *abfd,
7325 struct bfd_link_info *link_info,
7326 value_map_hash_table *values)
7328 xtensa_relax_info *relax_info;
7330 Elf_Internal_Rela *internal_relocs;
7331 source_reloc *src_relocs, *rel;
7332 bfd_boolean ok = TRUE;
7333 property_table_entry *prop_table = NULL;
7336 bfd_boolean last_loc_is_prev = FALSE;
7337 bfd_vma last_target_offset = 0;
7338 section_cache_t target_sec_cache;
7339 bfd_size_type sec_size;
7341 init_section_cache (&target_sec_cache);
7343 /* Do nothing if it is not a relaxable literal section. */
7344 relax_info = get_xtensa_relax_info (sec);
7345 BFD_ASSERT (relax_info);
7346 if (!relax_info->is_relaxable_literal_section)
7349 internal_relocs = retrieve_internal_relocs (abfd, sec,
7350 link_info->keep_memory);
7352 sec_size = bfd_get_section_limit (abfd, sec);
7353 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
7354 if (contents == NULL && sec_size != 0)
7360 /* Sort the source_relocs by target offset. */
7361 src_relocs = relax_info->src_relocs;
7362 qsort (src_relocs, relax_info->src_count,
7363 sizeof (source_reloc), source_reloc_compare);
7364 qsort (internal_relocs, sec->reloc_count, sizeof (Elf_Internal_Rela),
7365 internal_reloc_compare);
7367 ptblsize = xtensa_read_table_entries (abfd, sec, &prop_table,
7368 XTENSA_PROP_SEC_NAME, FALSE);
7376 for (i = 0; i < relax_info->src_count; i++)
7378 Elf_Internal_Rela *irel = NULL;
7380 rel = &src_relocs[i];
7381 if (get_l32r_opcode () != rel->opcode)
7383 irel = get_irel_at_offset (sec, internal_relocs,
7384 rel->r_rel.target_offset);
7386 /* If the relocation on this is not a simple R_XTENSA_32 or
7387 R_XTENSA_PLT then do not consider it. This may happen when
7388 the difference of two symbols is used in a literal. */
7389 if (irel && (ELF32_R_TYPE (irel->r_info) != R_XTENSA_32
7390 && ELF32_R_TYPE (irel->r_info) != R_XTENSA_PLT))
7393 /* If the target_offset for this relocation is the same as the
7394 previous relocation, then we've already considered whether the
7395 literal can be coalesced. Skip to the next one.... */
7396 if (i != 0 && prev_i != -1
7397 && src_relocs[i-1].r_rel.target_offset == rel->r_rel.target_offset)
7401 if (last_loc_is_prev &&
7402 last_target_offset + 4 != rel->r_rel.target_offset)
7403 last_loc_is_prev = FALSE;
7405 /* Check if the relocation was from an L32R that is being removed
7406 because a CALLX was converted to a direct CALL, and check if
7407 there are no other relocations to the literal. */
7408 if (is_removable_literal (rel, i, src_relocs, relax_info->src_count,
7409 sec, prop_table, ptblsize))
7411 if (!remove_dead_literal (abfd, sec, link_info, internal_relocs,
7412 irel, rel, prop_table, ptblsize))
7417 last_target_offset = rel->r_rel.target_offset;
7421 if (!identify_literal_placement (abfd, sec, contents, link_info,
7423 &last_loc_is_prev, irel,
7424 relax_info->src_count - i, rel,
7425 prop_table, ptblsize,
7426 &target_sec_cache, rel->is_abs_literal))
7431 last_target_offset = rel->r_rel.target_offset;
7435 print_removed_literals (stderr, &relax_info->removed_list);
7436 print_action_list (stderr, &relax_info->action_list);
7440 if (prop_table) free (prop_table);
7441 clear_section_cache (&target_sec_cache);
7443 release_contents (sec, contents);
7444 release_internal_relocs (sec, internal_relocs);
7449 static Elf_Internal_Rela *
7450 get_irel_at_offset (asection *sec,
7451 Elf_Internal_Rela *internal_relocs,
7455 Elf_Internal_Rela *irel;
7457 Elf_Internal_Rela key;
7459 if (!internal_relocs)
7462 key.r_offset = offset;
7463 irel = bsearch (&key, internal_relocs, sec->reloc_count,
7464 sizeof (Elf_Internal_Rela), internal_reloc_matches);
7468 /* bsearch does not guarantee which will be returned if there are
7469 multiple matches. We need the first that is not an alignment. */
7470 i = irel - internal_relocs;
7473 if (internal_relocs[i-1].r_offset != offset)
7477 for ( ; i < sec->reloc_count; i++)
7479 irel = &internal_relocs[i];
7480 r_type = ELF32_R_TYPE (irel->r_info);
7481 if (irel->r_offset == offset && r_type != R_XTENSA_NONE)
7490 is_removable_literal (const source_reloc *rel,
7492 const source_reloc *src_relocs,
7495 property_table_entry *prop_table,
7498 const source_reloc *curr_rel;
7499 property_table_entry *entry;
7504 entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
7505 sec->vma + rel->r_rel.target_offset);
7506 if (entry && (entry->flags & XTENSA_PROP_NO_TRANSFORM))
7509 for (++i; i < src_count; ++i)
7511 curr_rel = &src_relocs[i];
7512 /* If all others have the same target offset.... */
7513 if (curr_rel->r_rel.target_offset != rel->r_rel.target_offset)
7516 if (!curr_rel->is_null
7517 && !xtensa_is_property_section (curr_rel->source_sec)
7518 && !(curr_rel->source_sec->flags & SEC_DEBUGGING))
7526 remove_dead_literal (bfd *abfd,
7528 struct bfd_link_info *link_info,
7529 Elf_Internal_Rela *internal_relocs,
7530 Elf_Internal_Rela *irel,
7532 property_table_entry *prop_table,
7535 property_table_entry *entry;
7536 xtensa_relax_info *relax_info;
7538 relax_info = get_xtensa_relax_info (sec);
7542 entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
7543 sec->vma + rel->r_rel.target_offset);
7545 /* Mark the unused literal so that it will be removed. */
7546 add_removed_literal (&relax_info->removed_list, &rel->r_rel, NULL);
7548 text_action_add (&relax_info->action_list,
7549 ta_remove_literal, sec, rel->r_rel.target_offset, 4);
7551 /* If the section is 4-byte aligned, do not add fill. */
7552 if (sec->alignment_power > 2)
7554 int fill_extra_space;
7555 bfd_vma entry_sec_offset;
7557 property_table_entry *the_add_entry;
7561 entry_sec_offset = entry->address - sec->vma + entry->size;
7563 entry_sec_offset = rel->r_rel.target_offset + 4;
7565 /* If the literal range is at the end of the section,
7567 the_add_entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
7569 fill_extra_space = compute_fill_extra_space (the_add_entry);
7571 fa = find_fill_action (&relax_info->action_list, sec, entry_sec_offset);
7572 removed_diff = compute_removed_action_diff (fa, sec, entry_sec_offset,
7573 -4, fill_extra_space);
7575 adjust_fill_action (fa, removed_diff);
7577 text_action_add (&relax_info->action_list,
7578 ta_fill, sec, entry_sec_offset, removed_diff);
7581 /* Zero out the relocation on this literal location. */
7584 if (elf_hash_table (link_info)->dynamic_sections_created)
7585 shrink_dynamic_reloc_sections (link_info, abfd, sec, irel);
7587 irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
7588 pin_internal_relocs (sec, internal_relocs);
7591 /* Do not modify "last_loc_is_prev". */
7597 identify_literal_placement (bfd *abfd,
7600 struct bfd_link_info *link_info,
7601 value_map_hash_table *values,
7602 bfd_boolean *last_loc_is_prev_p,
7603 Elf_Internal_Rela *irel,
7604 int remaining_src_rels,
7606 property_table_entry *prop_table,
7608 section_cache_t *target_sec_cache,
7609 bfd_boolean is_abs_literal)
7613 xtensa_relax_info *relax_info;
7614 bfd_boolean literal_placed = FALSE;
7616 unsigned long value;
7617 bfd_boolean final_static_link;
7618 bfd_size_type sec_size;
7620 relax_info = get_xtensa_relax_info (sec);
7624 sec_size = bfd_get_section_limit (abfd, sec);
7627 (!link_info->relocatable
7628 && !elf_hash_table (link_info)->dynamic_sections_created);
7630 /* The placement algorithm first checks to see if the literal is
7631 already in the value map. If so and the value map is reachable
7632 from all uses, then the literal is moved to that location. If
7633 not, then we identify the last location where a fresh literal was
7634 placed. If the literal can be safely moved there, then we do so.
7635 If not, then we assume that the literal is not to move and leave
7636 the literal where it is, marking it as the last literal
7639 /* Find the literal value. */
7641 r_reloc_init (&r_rel, abfd, irel, contents, sec_size);
7644 BFD_ASSERT (rel->r_rel.target_offset < sec_size);
7645 value = bfd_get_32 (abfd, contents + rel->r_rel.target_offset);
7647 init_literal_value (&val, &r_rel, value, is_abs_literal);
7649 /* Check if we've seen another literal with the same value that
7650 is in the same output section. */
7651 val_map = value_map_get_cached_value (values, &val, final_static_link);
7654 && (r_reloc_get_section (&val_map->loc)->output_section
7655 == sec->output_section)
7656 && relocations_reach (rel, remaining_src_rels, &val_map->loc)
7657 && coalesce_shared_literal (sec, rel, prop_table, ptblsize, val_map))
7659 /* No change to last_loc_is_prev. */
7660 literal_placed = TRUE;
7663 /* For relocatable links, do not try to move literals. To do it
7664 correctly might increase the number of relocations in an input
7665 section making the default relocatable linking fail. */
7666 if (!link_info->relocatable && !literal_placed
7667 && values->has_last_loc && !(*last_loc_is_prev_p))
7669 asection *target_sec = r_reloc_get_section (&values->last_loc);
7670 if (target_sec && target_sec->output_section == sec->output_section)
7672 /* Increment the virtual offset. */
7673 r_reloc try_loc = values->last_loc;
7674 try_loc.virtual_offset += 4;
7676 /* There is a last loc that was in the same output section. */
7677 if (relocations_reach (rel, remaining_src_rels, &try_loc)
7678 && move_shared_literal (sec, link_info, rel,
7679 prop_table, ptblsize,
7680 &try_loc, &val, target_sec_cache))
7682 values->last_loc.virtual_offset += 4;
7683 literal_placed = TRUE;
7685 val_map = add_value_map (values, &val, &try_loc,
7688 val_map->loc = try_loc;
7693 if (!literal_placed)
7695 /* Nothing worked, leave the literal alone but update the last loc. */
7696 values->has_last_loc = TRUE;
7697 values->last_loc = rel->r_rel;
7699 val_map = add_value_map (values, &val, &rel->r_rel, final_static_link);
7701 val_map->loc = rel->r_rel;
7702 *last_loc_is_prev_p = TRUE;
7709 /* Check if the original relocations (presumably on L32R instructions)
7710 identified by reloc[0..N] can be changed to reference the literal
7711 identified by r_rel. If r_rel is out of range for any of the
7712 original relocations, then we don't want to coalesce the original
7713 literal with the one at r_rel. We only check reloc[0..N], where the
7714 offsets are all the same as for reloc[0] (i.e., they're all
7715 referencing the same literal) and where N is also bounded by the
7716 number of remaining entries in the "reloc" array. The "reloc" array
7717 is sorted by target offset so we know all the entries for the same
7718 literal will be contiguous. */
7721 relocations_reach (source_reloc *reloc,
7722 int remaining_relocs,
7723 const r_reloc *r_rel)
7725 bfd_vma from_offset, source_address, dest_address;
7729 if (!r_reloc_is_defined (r_rel))
7732 sec = r_reloc_get_section (r_rel);
7733 from_offset = reloc[0].r_rel.target_offset;
7735 for (i = 0; i < remaining_relocs; i++)
7737 if (reloc[i].r_rel.target_offset != from_offset)
7740 /* Ignore relocations that have been removed. */
7741 if (reloc[i].is_null)
7744 /* The original and new output section for these must be the same
7745 in order to coalesce. */
7746 if (r_reloc_get_section (&reloc[i].r_rel)->output_section
7747 != sec->output_section)
7750 /* Absolute literals in the same output section can always be
7752 if (reloc[i].is_abs_literal)
7755 /* A literal with no PC-relative relocations can be moved anywhere. */
7756 if (reloc[i].opnd != -1)
7758 /* Otherwise, check to see that it fits. */
7759 source_address = (reloc[i].source_sec->output_section->vma
7760 + reloc[i].source_sec->output_offset
7761 + reloc[i].r_rel.rela.r_offset);
7762 dest_address = (sec->output_section->vma
7763 + sec->output_offset
7764 + r_rel->target_offset);
7766 if (!pcrel_reloc_fits (reloc[i].opcode, reloc[i].opnd,
7767 source_address, dest_address))
7776 /* Move a literal to another literal location because it is
7777 the same as the other literal value. */
7780 coalesce_shared_literal (asection *sec,
7782 property_table_entry *prop_table,
7786 property_table_entry *entry;
7788 property_table_entry *the_add_entry;
7790 xtensa_relax_info *relax_info;
7792 relax_info = get_xtensa_relax_info (sec);
7796 entry = elf_xtensa_find_property_entry
7797 (prop_table, ptblsize, sec->vma + rel->r_rel.target_offset);
7798 if (entry && (entry->flags & XTENSA_PROP_NO_TRANSFORM))
7801 /* Mark that the literal will be coalesced. */
7802 add_removed_literal (&relax_info->removed_list, &rel->r_rel, &val_map->loc);
7804 text_action_add (&relax_info->action_list,
7805 ta_remove_literal, sec, rel->r_rel.target_offset, 4);
7807 /* If the section is 4-byte aligned, do not add fill. */
7808 if (sec->alignment_power > 2)
7810 int fill_extra_space;
7811 bfd_vma entry_sec_offset;
7814 entry_sec_offset = entry->address - sec->vma + entry->size;
7816 entry_sec_offset = rel->r_rel.target_offset + 4;
7818 /* If the literal range is at the end of the section,
7820 fill_extra_space = 0;
7821 the_add_entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
7823 if (the_add_entry && (the_add_entry->flags & XTENSA_PROP_UNREACHABLE))
7824 fill_extra_space = the_add_entry->size;
7826 fa = find_fill_action (&relax_info->action_list, sec, entry_sec_offset);
7827 removed_diff = compute_removed_action_diff (fa, sec, entry_sec_offset,
7828 -4, fill_extra_space);
7830 adjust_fill_action (fa, removed_diff);
7832 text_action_add (&relax_info->action_list,
7833 ta_fill, sec, entry_sec_offset, removed_diff);
7840 /* Move a literal to another location. This may actually increase the
7841 total amount of space used because of alignments so we need to do
7842 this carefully. Also, it may make a branch go out of range. */
7845 move_shared_literal (asection *sec,
7846 struct bfd_link_info *link_info,
7848 property_table_entry *prop_table,
7850 const r_reloc *target_loc,
7851 const literal_value *lit_value,
7852 section_cache_t *target_sec_cache)
7854 property_table_entry *the_add_entry, *src_entry, *target_entry = NULL;
7855 text_action *fa, *target_fa;
7857 xtensa_relax_info *relax_info, *target_relax_info;
7858 asection *target_sec;
7860 ebb_constraint ebb_table;
7861 bfd_boolean relocs_fit;
7863 /* If this routine always returns FALSE, the literals that cannot be
7864 coalesced will not be moved. */
7865 if (elf32xtensa_no_literal_movement)
7868 relax_info = get_xtensa_relax_info (sec);
7872 target_sec = r_reloc_get_section (target_loc);
7873 target_relax_info = get_xtensa_relax_info (target_sec);
7875 /* Literals to undefined sections may not be moved because they
7876 must report an error. */
7877 if (bfd_is_und_section (target_sec))
7880 src_entry = elf_xtensa_find_property_entry
7881 (prop_table, ptblsize, sec->vma + rel->r_rel.target_offset);
7883 if (!section_cache_section (target_sec_cache, target_sec, link_info))
7886 target_entry = elf_xtensa_find_property_entry
7887 (target_sec_cache->ptbl, target_sec_cache->pte_count,
7888 target_sec->vma + target_loc->target_offset);
7893 /* Make sure that we have not broken any branches. */
7896 init_ebb_constraint (&ebb_table);
7897 ebb = &ebb_table.ebb;
7898 init_ebb (ebb, target_sec_cache->sec, target_sec_cache->contents,
7899 target_sec_cache->content_length,
7900 target_sec_cache->ptbl, target_sec_cache->pte_count,
7901 target_sec_cache->relocs, target_sec_cache->reloc_count);
7903 /* Propose to add 4 bytes + worst-case alignment size increase to
7905 ebb_propose_action (&ebb_table, EBB_NO_ALIGN, 0,
7906 ta_fill, target_loc->target_offset,
7907 -4 - (1 << target_sec->alignment_power), TRUE);
7909 /* Check all of the PC-relative relocations to make sure they still fit. */
7910 relocs_fit = check_section_ebb_pcrels_fit (target_sec->owner, target_sec,
7911 target_sec_cache->contents,
7912 target_sec_cache->relocs,
7918 text_action_add_literal (&target_relax_info->action_list,
7919 ta_add_literal, target_loc, lit_value, -4);
7921 if (target_sec->alignment_power > 2 && target_entry != src_entry)
7923 /* May need to add or remove some fill to maintain alignment. */
7924 int fill_extra_space;
7925 bfd_vma entry_sec_offset;
7928 target_entry->address - target_sec->vma + target_entry->size;
7930 /* If the literal range is at the end of the section,
7932 fill_extra_space = 0;
7934 elf_xtensa_find_property_entry (target_sec_cache->ptbl,
7935 target_sec_cache->pte_count,
7937 if (the_add_entry && (the_add_entry->flags & XTENSA_PROP_UNREACHABLE))
7938 fill_extra_space = the_add_entry->size;
7940 target_fa = find_fill_action (&target_relax_info->action_list,
7941 target_sec, entry_sec_offset);
7942 removed_diff = compute_removed_action_diff (target_fa, target_sec,
7943 entry_sec_offset, 4,
7946 adjust_fill_action (target_fa, removed_diff);
7948 text_action_add (&target_relax_info->action_list,
7949 ta_fill, target_sec, entry_sec_offset, removed_diff);
7952 /* Mark that the literal will be moved to the new location. */
7953 add_removed_literal (&relax_info->removed_list, &rel->r_rel, target_loc);
7955 /* Remove the literal. */
7956 text_action_add (&relax_info->action_list,
7957 ta_remove_literal, sec, rel->r_rel.target_offset, 4);
7959 /* If the section is 4-byte aligned, do not add fill. */
7960 if (sec->alignment_power > 2 && target_entry != src_entry)
7962 int fill_extra_space;
7963 bfd_vma entry_sec_offset;
7966 entry_sec_offset = src_entry->address - sec->vma + src_entry->size;
7968 entry_sec_offset = rel->r_rel.target_offset+4;
7970 /* If the literal range is at the end of the section,
7972 fill_extra_space = 0;
7973 the_add_entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
7975 if (the_add_entry && (the_add_entry->flags & XTENSA_PROP_UNREACHABLE))
7976 fill_extra_space = the_add_entry->size;
7978 fa = find_fill_action (&relax_info->action_list, sec, entry_sec_offset);
7979 removed_diff = compute_removed_action_diff (fa, sec, entry_sec_offset,
7980 -4, fill_extra_space);
7982 adjust_fill_action (fa, removed_diff);
7984 text_action_add (&relax_info->action_list,
7985 ta_fill, sec, entry_sec_offset, removed_diff);
7992 /* Second relaxation pass. */
7994 /* Modify all of the relocations to point to the right spot, and if this
7995 is a relaxable section, delete the unwanted literals and fix the
7999 relax_section (bfd *abfd, asection *sec, struct bfd_link_info *link_info)
8001 Elf_Internal_Rela *internal_relocs;
8002 xtensa_relax_info *relax_info;
8004 bfd_boolean ok = TRUE;
8006 bfd_boolean rv = FALSE;
8007 bfd_boolean virtual_action;
8008 bfd_size_type sec_size;
8010 sec_size = bfd_get_section_limit (abfd, sec);
8011 relax_info = get_xtensa_relax_info (sec);
8012 BFD_ASSERT (relax_info);
8014 /* First translate any of the fixes that have been added already. */
8015 translate_section_fixes (sec);
8017 /* Handle property sections (e.g., literal tables) specially. */
8018 if (xtensa_is_property_section (sec))
8020 BFD_ASSERT (!relax_info->is_relaxable_literal_section);
8021 return relax_property_section (abfd, sec, link_info);
8024 internal_relocs = retrieve_internal_relocs (abfd, sec,
8025 link_info->keep_memory);
8026 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
8027 if (contents == NULL && sec_size != 0)
8033 if (internal_relocs)
8035 for (i = 0; i < sec->reloc_count; i++)
8037 Elf_Internal_Rela *irel;
8038 xtensa_relax_info *target_relax_info;
8039 bfd_vma source_offset, old_source_offset;
8042 asection *target_sec;
8044 /* Locally change the source address.
8045 Translate the target to the new target address.
8046 If it points to this section and has been removed,
8050 irel = &internal_relocs[i];
8051 source_offset = irel->r_offset;
8052 old_source_offset = source_offset;
8054 r_type = ELF32_R_TYPE (irel->r_info);
8055 r_reloc_init (&r_rel, abfd, irel, contents,
8056 bfd_get_section_limit (abfd, sec));
8058 /* If this section could have changed then we may need to
8059 change the relocation's offset. */
8061 if (relax_info->is_relaxable_literal_section
8062 || relax_info->is_relaxable_asm_section)
8064 pin_internal_relocs (sec, internal_relocs);
8066 if (r_type != R_XTENSA_NONE
8067 && find_removed_literal (&relax_info->removed_list,
8070 /* Remove this relocation. */
8071 if (elf_hash_table (link_info)->dynamic_sections_created)
8072 shrink_dynamic_reloc_sections (link_info, abfd, sec, irel);
8073 irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
8074 irel->r_offset = offset_with_removed_text
8075 (&relax_info->action_list, irel->r_offset);
8079 if (r_type == R_XTENSA_ASM_SIMPLIFY)
8081 text_action *action =
8082 find_insn_action (&relax_info->action_list,
8084 if (action && (action->action == ta_convert_longcall
8085 || action->action == ta_remove_longcall))
8087 bfd_reloc_status_type retval;
8088 char *error_message = NULL;
8090 retval = contract_asm_expansion (contents, sec_size,
8091 irel, &error_message);
8092 if (retval != bfd_reloc_ok)
8094 (*link_info->callbacks->reloc_dangerous)
8095 (link_info, error_message, abfd, sec,
8099 /* Update the action so that the code that moves
8100 the contents will do the right thing. */
8101 if (action->action == ta_remove_longcall)
8102 action->action = ta_remove_insn;
8104 action->action = ta_none;
8105 /* Refresh the info in the r_rel. */
8106 r_reloc_init (&r_rel, abfd, irel, contents, sec_size);
8107 r_type = ELF32_R_TYPE (irel->r_info);
8111 source_offset = offset_with_removed_text
8112 (&relax_info->action_list, irel->r_offset);
8113 irel->r_offset = source_offset;
8116 /* If the target section could have changed then
8117 we may need to change the relocation's target offset. */
8119 target_sec = r_reloc_get_section (&r_rel);
8121 /* For a reference to a discarded section from a DWARF section,
8122 i.e., where action_discarded is PRETEND, the symbol will
8123 eventually be modified to refer to the kept section (at least if
8124 the kept and discarded sections are the same size). Anticipate
8125 that here and adjust things accordingly. */
8126 if (! elf_xtensa_ignore_discarded_relocs (sec)
8127 && elf_xtensa_action_discarded (sec) == PRETEND
8128 && sec->sec_info_type != ELF_INFO_TYPE_STABS
8129 && target_sec != NULL
8130 && elf_discarded_section (target_sec))
8132 /* It would be natural to call _bfd_elf_check_kept_section
8133 here, but it's not exported from elflink.c. It's also a
8134 fairly expensive check. Adjusting the relocations to the
8135 discarded section is fairly harmless; it will only adjust
8136 some addends and difference values. If it turns out that
8137 _bfd_elf_check_kept_section fails later, it won't matter,
8138 so just compare the section names to find the right group
8140 asection *kept = target_sec->kept_section;
8143 if ((kept->flags & SEC_GROUP) != 0)
8145 asection *first = elf_next_in_group (kept);
8146 asection *s = first;
8151 if (strcmp (s->name, target_sec->name) == 0)
8156 s = elf_next_in_group (s);
8163 && ((target_sec->rawsize != 0
8164 ? target_sec->rawsize : target_sec->size)
8165 == (kept->rawsize != 0 ? kept->rawsize : kept->size)))
8169 target_relax_info = get_xtensa_relax_info (target_sec);
8170 if (target_relax_info
8171 && (target_relax_info->is_relaxable_literal_section
8172 || target_relax_info->is_relaxable_asm_section))
8175 target_sec = translate_reloc (&r_rel, &new_reloc, target_sec);
8177 if (r_type == R_XTENSA_DIFF8
8178 || r_type == R_XTENSA_DIFF16
8179 || r_type == R_XTENSA_DIFF32)
8181 bfd_vma diff_value = 0, new_end_offset, diff_mask = 0;
8183 if (bfd_get_section_limit (abfd, sec) < old_source_offset)
8185 (*link_info->callbacks->reloc_dangerous)
8186 (link_info, _("invalid relocation address"),
8187 abfd, sec, old_source_offset);
8193 case R_XTENSA_DIFF8:
8195 bfd_get_8 (abfd, &contents[old_source_offset]);
8197 case R_XTENSA_DIFF16:
8199 bfd_get_16 (abfd, &contents[old_source_offset]);
8201 case R_XTENSA_DIFF32:
8203 bfd_get_32 (abfd, &contents[old_source_offset]);
8207 new_end_offset = offset_with_removed_text
8208 (&target_relax_info->action_list,
8209 r_rel.target_offset + diff_value);
8210 diff_value = new_end_offset - new_reloc.target_offset;
8214 case R_XTENSA_DIFF8:
8216 bfd_put_8 (abfd, diff_value,
8217 &contents[old_source_offset]);
8219 case R_XTENSA_DIFF16:
8221 bfd_put_16 (abfd, diff_value,
8222 &contents[old_source_offset]);
8224 case R_XTENSA_DIFF32:
8225 diff_mask = 0xffffffff;
8226 bfd_put_32 (abfd, diff_value,
8227 &contents[old_source_offset]);
8231 /* Check for overflow. */
8232 if ((diff_value & ~diff_mask) != 0)
8234 (*link_info->callbacks->reloc_dangerous)
8235 (link_info, _("overflow after relaxation"),
8236 abfd, sec, old_source_offset);
8240 pin_contents (sec, contents);
8244 /* If the relocation still references a section in the same
8245 input file, modify the relocation directly instead of
8246 adding a "fix" record. */
8247 if (target_sec->owner == abfd)
8249 unsigned r_symndx = ELF32_R_SYM (new_reloc.rela.r_info);
8250 irel->r_info = ELF32_R_INFO (r_symndx, r_type);
8251 irel->r_addend = new_reloc.rela.r_addend;
8252 pin_internal_relocs (sec, internal_relocs);
8256 bfd_vma addend_displacement;
8259 addend_displacement =
8260 new_reloc.target_offset + new_reloc.virtual_offset;
8261 fix = reloc_bfd_fix_init (sec, source_offset, r_type,
8263 addend_displacement, TRUE);
8271 if ((relax_info->is_relaxable_literal_section
8272 || relax_info->is_relaxable_asm_section)
8273 && relax_info->action_list.head)
8275 /* Walk through the planned actions and build up a table
8276 of move, copy and fill records. Use the move, copy and
8277 fill records to perform the actions once. */
8280 bfd_size_type final_size, copy_size, orig_insn_size;
8281 bfd_byte *scratch = NULL;
8282 bfd_byte *dup_contents = NULL;
8283 bfd_size_type orig_size = sec->size;
8284 bfd_vma orig_dot = 0;
8285 bfd_vma orig_dot_copied = 0; /* Byte copied already from
8286 orig dot in physical memory. */
8287 bfd_vma orig_dot_vo = 0; /* Virtual offset from orig_dot. */
8288 bfd_vma dup_dot = 0;
8290 text_action *action = relax_info->action_list.head;
8292 final_size = sec->size;
8293 for (action = relax_info->action_list.head; action;
8294 action = action->next)
8296 final_size -= action->removed_bytes;
8299 scratch = (bfd_byte *) bfd_zmalloc (final_size);
8300 dup_contents = (bfd_byte *) bfd_zmalloc (final_size);
8302 /* The dot is the current fill location. */
8304 print_action_list (stderr, &relax_info->action_list);
8307 for (action = relax_info->action_list.head; action;
8308 action = action->next)
8310 virtual_action = FALSE;
8311 if (action->offset > orig_dot)
8313 orig_dot += orig_dot_copied;
8314 orig_dot_copied = 0;
8316 /* Out of the virtual world. */
8319 if (action->offset > orig_dot)
8321 copy_size = action->offset - orig_dot;
8322 memmove (&dup_contents[dup_dot], &contents[orig_dot], copy_size);
8323 orig_dot += copy_size;
8324 dup_dot += copy_size;
8325 BFD_ASSERT (action->offset == orig_dot);
8327 else if (action->offset < orig_dot)
8329 if (action->action == ta_fill
8330 && action->offset - action->removed_bytes == orig_dot)
8332 /* This is OK because the fill only effects the dup_dot. */
8334 else if (action->action == ta_add_literal)
8336 /* TBD. Might need to handle this. */
8339 if (action->offset == orig_dot)
8341 if (action->virtual_offset > orig_dot_vo)
8343 if (orig_dot_vo == 0)
8345 /* Need to copy virtual_offset bytes. Probably four. */
8346 copy_size = action->virtual_offset - orig_dot_vo;
8347 memmove (&dup_contents[dup_dot],
8348 &contents[orig_dot], copy_size);
8349 orig_dot_copied = copy_size;
8350 dup_dot += copy_size;
8352 virtual_action = TRUE;
8355 BFD_ASSERT (action->virtual_offset <= orig_dot_vo);
8357 switch (action->action)
8359 case ta_remove_literal:
8360 case ta_remove_insn:
8361 BFD_ASSERT (action->removed_bytes >= 0);
8362 orig_dot += action->removed_bytes;
8365 case ta_narrow_insn:
8368 memmove (scratch, &contents[orig_dot], orig_insn_size);
8369 BFD_ASSERT (action->removed_bytes == 1);
8370 rv = narrow_instruction (scratch, final_size, 0);
8372 memmove (&dup_contents[dup_dot], scratch, copy_size);
8373 orig_dot += orig_insn_size;
8374 dup_dot += copy_size;
8378 if (action->removed_bytes >= 0)
8379 orig_dot += action->removed_bytes;
8382 /* Already zeroed in dup_contents. Just bump the
8384 dup_dot += (-action->removed_bytes);
8389 BFD_ASSERT (action->removed_bytes == 0);
8392 case ta_convert_longcall:
8393 case ta_remove_longcall:
8394 /* These will be removed or converted before we get here. */
8401 memmove (scratch, &contents[orig_dot], orig_insn_size);
8402 BFD_ASSERT (action->removed_bytes == -1);
8403 rv = widen_instruction (scratch, final_size, 0);
8405 memmove (&dup_contents[dup_dot], scratch, copy_size);
8406 orig_dot += orig_insn_size;
8407 dup_dot += copy_size;
8410 case ta_add_literal:
8413 BFD_ASSERT (action->removed_bytes == -4);
8414 /* TBD -- place the literal value here and insert
8416 memset (&dup_contents[dup_dot], 0, 4);
8417 pin_internal_relocs (sec, internal_relocs);
8418 pin_contents (sec, contents);
8420 if (!move_literal (abfd, link_info, sec, dup_dot, dup_contents,
8421 relax_info, &internal_relocs, &action->value))
8425 orig_dot_vo += copy_size;
8427 orig_dot += orig_insn_size;
8428 dup_dot += copy_size;
8432 /* Not implemented yet. */
8437 removed += action->removed_bytes;
8438 BFD_ASSERT (dup_dot <= final_size);
8439 BFD_ASSERT (orig_dot <= orig_size);
8442 orig_dot += orig_dot_copied;
8443 orig_dot_copied = 0;
8445 if (orig_dot != orig_size)
8447 copy_size = orig_size - orig_dot;
8448 BFD_ASSERT (orig_size > orig_dot);
8449 BFD_ASSERT (dup_dot + copy_size == final_size);
8450 memmove (&dup_contents[dup_dot], &contents[orig_dot], copy_size);
8451 orig_dot += copy_size;
8452 dup_dot += copy_size;
8454 BFD_ASSERT (orig_size == orig_dot);
8455 BFD_ASSERT (final_size == dup_dot);
8457 /* Move the dup_contents back. */
8458 if (final_size > orig_size)
8460 /* Contents need to be reallocated. Swap the dup_contents into
8462 sec->contents = dup_contents;
8464 contents = dup_contents;
8465 pin_contents (sec, contents);
8469 BFD_ASSERT (final_size <= orig_size);
8470 memset (contents, 0, orig_size);
8471 memcpy (contents, dup_contents, final_size);
8472 free (dup_contents);
8475 pin_contents (sec, contents);
8477 if (sec->rawsize == 0)
8478 sec->rawsize = sec->size;
8479 sec->size = final_size;
8483 release_internal_relocs (sec, internal_relocs);
8484 release_contents (sec, contents);
8490 translate_section_fixes (asection *sec)
8492 xtensa_relax_info *relax_info;
8495 relax_info = get_xtensa_relax_info (sec);
8499 for (r = relax_info->fix_list; r != NULL; r = r->next)
8500 if (!translate_reloc_bfd_fix (r))
8507 /* Translate a fix given the mapping in the relax info for the target
8508 section. If it has already been translated, no work is required. */
8511 translate_reloc_bfd_fix (reloc_bfd_fix *fix)
8513 reloc_bfd_fix new_fix;
8515 xtensa_relax_info *relax_info;
8516 removed_literal *removed;
8517 bfd_vma new_offset, target_offset;
8519 if (fix->translated)
8522 sec = fix->target_sec;
8523 target_offset = fix->target_offset;
8525 relax_info = get_xtensa_relax_info (sec);
8528 fix->translated = TRUE;
8534 /* The fix does not need to be translated if the section cannot change. */
8535 if (!relax_info->is_relaxable_literal_section
8536 && !relax_info->is_relaxable_asm_section)
8538 fix->translated = TRUE;
8542 /* If the literal has been moved and this relocation was on an
8543 opcode, then the relocation should move to the new literal
8544 location. Otherwise, the relocation should move within the
8548 if (is_operand_relocation (fix->src_type))
8550 /* Check if the original relocation is against a literal being
8552 removed = find_removed_literal (&relax_info->removed_list,
8560 /* The fact that there is still a relocation to this literal indicates
8561 that the literal is being coalesced, not simply removed. */
8562 BFD_ASSERT (removed->to.abfd != NULL);
8564 /* This was moved to some other address (possibly another section). */
8565 new_sec = r_reloc_get_section (&removed->to);
8569 relax_info = get_xtensa_relax_info (sec);
8571 (!relax_info->is_relaxable_literal_section
8572 && !relax_info->is_relaxable_asm_section))
8574 target_offset = removed->to.target_offset;
8575 new_fix.target_sec = new_sec;
8576 new_fix.target_offset = target_offset;
8577 new_fix.translated = TRUE;
8582 target_offset = removed->to.target_offset;
8583 new_fix.target_sec = new_sec;
8586 /* The target address may have been moved within its section. */
8587 new_offset = offset_with_removed_text (&relax_info->action_list,
8590 new_fix.target_offset = new_offset;
8591 new_fix.target_offset = new_offset;
8592 new_fix.translated = TRUE;
8598 /* Fix up a relocation to take account of removed literals. */
8601 translate_reloc (const r_reloc *orig_rel, r_reloc *new_rel, asection *sec)
8603 xtensa_relax_info *relax_info;
8604 removed_literal *removed;
8605 bfd_vma target_offset, base_offset;
8608 *new_rel = *orig_rel;
8610 if (!r_reloc_is_defined (orig_rel))
8613 relax_info = get_xtensa_relax_info (sec);
8614 BFD_ASSERT (relax_info && (relax_info->is_relaxable_literal_section
8615 || relax_info->is_relaxable_asm_section));
8617 target_offset = orig_rel->target_offset;
8620 if (is_operand_relocation (ELF32_R_TYPE (orig_rel->rela.r_info)))
8622 /* Check if the original relocation is against a literal being
8624 removed = find_removed_literal (&relax_info->removed_list,
8627 if (removed && removed->to.abfd)
8631 /* The fact that there is still a relocation to this literal indicates
8632 that the literal is being coalesced, not simply removed. */
8633 BFD_ASSERT (removed->to.abfd != NULL);
8635 /* This was moved to some other address
8636 (possibly in another section). */
8637 *new_rel = removed->to;
8638 new_sec = r_reloc_get_section (new_rel);
8642 relax_info = get_xtensa_relax_info (sec);
8644 || (!relax_info->is_relaxable_literal_section
8645 && !relax_info->is_relaxable_asm_section))
8648 target_offset = new_rel->target_offset;
8651 /* Find the base offset of the reloc symbol, excluding any addend from the
8652 reloc or from the section contents (for a partial_inplace reloc). Then
8653 find the adjusted values of the offsets due to relaxation. The base
8654 offset is needed to determine the change to the reloc's addend; the reloc
8655 addend should not be adjusted due to relaxations located before the base
8658 base_offset = r_reloc_get_target_offset (new_rel) - new_rel->rela.r_addend;
8659 act = relax_info->action_list.head;
8660 if (base_offset <= target_offset)
8662 int base_removed = removed_by_actions (&act, base_offset, FALSE);
8663 int addend_removed = removed_by_actions (&act, target_offset, FALSE);
8664 new_rel->target_offset = target_offset - base_removed - addend_removed;
8665 new_rel->rela.r_addend -= addend_removed;
8669 /* Handle a negative addend. The base offset comes first. */
8670 int tgt_removed = removed_by_actions (&act, target_offset, FALSE);
8671 int addend_removed = removed_by_actions (&act, base_offset, FALSE);
8672 new_rel->target_offset = target_offset - tgt_removed;
8673 new_rel->rela.r_addend += addend_removed;
8680 /* For dynamic links, there may be a dynamic relocation for each
8681 literal. The number of dynamic relocations must be computed in
8682 size_dynamic_sections, which occurs before relaxation. When a
8683 literal is removed, this function checks if there is a corresponding
8684 dynamic relocation and shrinks the size of the appropriate dynamic
8685 relocation section accordingly. At this point, the contents of the
8686 dynamic relocation sections have not yet been filled in, so there's
8687 nothing else that needs to be done. */
8690 shrink_dynamic_reloc_sections (struct bfd_link_info *info,
8692 asection *input_section,
8693 Elf_Internal_Rela *rel)
8695 struct elf_xtensa_link_hash_table *htab;
8696 Elf_Internal_Shdr *symtab_hdr;
8697 struct elf_link_hash_entry **sym_hashes;
8698 unsigned long r_symndx;
8700 struct elf_link_hash_entry *h;
8701 bfd_boolean dynamic_symbol;
8703 htab = elf_xtensa_hash_table (info);
8704 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
8705 sym_hashes = elf_sym_hashes (abfd);
8707 r_type = ELF32_R_TYPE (rel->r_info);
8708 r_symndx = ELF32_R_SYM (rel->r_info);
8710 if (r_symndx < symtab_hdr->sh_info)
8713 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
8715 dynamic_symbol = elf_xtensa_dynamic_symbol_p (h, info);
8717 if ((r_type == R_XTENSA_32 || r_type == R_XTENSA_PLT)
8718 && (input_section->flags & SEC_ALLOC) != 0
8719 && (dynamic_symbol || info->shared))
8722 bfd_boolean is_plt = FALSE;
8724 if (dynamic_symbol && r_type == R_XTENSA_PLT)
8726 srel = htab->srelplt;
8730 srel = htab->srelgot;
8732 /* Reduce size of the .rela.* section by one reloc. */
8733 BFD_ASSERT (srel != NULL);
8734 BFD_ASSERT (srel->size >= sizeof (Elf32_External_Rela));
8735 srel->size -= sizeof (Elf32_External_Rela);
8739 asection *splt, *sgotplt, *srelgot;
8740 int reloc_index, chunk;
8742 /* Find the PLT reloc index of the entry being removed. This
8743 is computed from the size of ".rela.plt". It is needed to
8744 figure out which PLT chunk to resize. Usually "last index
8745 = size - 1" since the index starts at zero, but in this
8746 context, the size has just been decremented so there's no
8747 need to subtract one. */
8748 reloc_index = srel->size / sizeof (Elf32_External_Rela);
8750 chunk = reloc_index / PLT_ENTRIES_PER_CHUNK;
8751 splt = elf_xtensa_get_plt_section (info, chunk);
8752 sgotplt = elf_xtensa_get_gotplt_section (info, chunk);
8753 BFD_ASSERT (splt != NULL && sgotplt != NULL);
8755 /* Check if an entire PLT chunk has just been eliminated. */
8756 if (reloc_index % PLT_ENTRIES_PER_CHUNK == 0)
8758 /* The two magic GOT entries for that chunk can go away. */
8759 srelgot = htab->srelgot;
8760 BFD_ASSERT (srelgot != NULL);
8761 srelgot->reloc_count -= 2;
8762 srelgot->size -= 2 * sizeof (Elf32_External_Rela);
8765 /* There should be only one entry left (and it will be
8767 BFD_ASSERT (sgotplt->size == 4);
8768 BFD_ASSERT (splt->size == PLT_ENTRY_SIZE);
8771 BFD_ASSERT (sgotplt->size >= 4);
8772 BFD_ASSERT (splt->size >= PLT_ENTRY_SIZE);
8775 splt->size -= PLT_ENTRY_SIZE;
8781 /* Take an r_rel and move it to another section. This usually
8782 requires extending the interal_relocation array and pinning it. If
8783 the original r_rel is from the same BFD, we can complete this here.
8784 Otherwise, we add a fix record to let the final link fix the
8785 appropriate address. Contents and internal relocations for the
8786 section must be pinned after calling this routine. */
8789 move_literal (bfd *abfd,
8790 struct bfd_link_info *link_info,
8794 xtensa_relax_info *relax_info,
8795 Elf_Internal_Rela **internal_relocs_p,
8796 const literal_value *lit)
8798 Elf_Internal_Rela *new_relocs = NULL;
8799 size_t new_relocs_count = 0;
8800 Elf_Internal_Rela this_rela;
8801 const r_reloc *r_rel;
8803 r_rel = &lit->r_rel;
8804 BFD_ASSERT (elf_section_data (sec)->relocs == *internal_relocs_p);
8806 if (r_reloc_is_const (r_rel))
8807 bfd_put_32 (abfd, lit->value, contents + offset);
8812 asection *target_sec;
8816 r_type = ELF32_R_TYPE (r_rel->rela.r_info);
8817 target_sec = r_reloc_get_section (r_rel);
8819 /* This is the difficult case. We have to create a fix up. */
8820 this_rela.r_offset = offset;
8821 this_rela.r_info = ELF32_R_INFO (0, r_type);
8822 this_rela.r_addend =
8823 r_rel->target_offset - r_reloc_get_target_offset (r_rel);
8824 bfd_put_32 (abfd, lit->value, contents + offset);
8826 /* Currently, we cannot move relocations during a relocatable link. */
8827 BFD_ASSERT (!link_info->relocatable);
8828 fix = reloc_bfd_fix_init (sec, offset, r_type,
8829 r_reloc_get_section (r_rel),
8830 r_rel->target_offset + r_rel->virtual_offset,
8832 /* We also need to mark that relocations are needed here. */
8833 sec->flags |= SEC_RELOC;
8835 translate_reloc_bfd_fix (fix);
8836 /* This fix has not yet been translated. */
8839 /* Add the relocation. If we have already allocated our own
8840 space for the relocations and we have room for more, then use
8841 it. Otherwise, allocate new space and move the literals. */
8842 insert_at = sec->reloc_count;
8843 for (i = 0; i < sec->reloc_count; ++i)
8845 if (this_rela.r_offset < (*internal_relocs_p)[i].r_offset)
8852 if (*internal_relocs_p != relax_info->allocated_relocs
8853 || sec->reloc_count + 1 > relax_info->allocated_relocs_count)
8855 BFD_ASSERT (relax_info->allocated_relocs == NULL
8856 || sec->reloc_count == relax_info->relocs_count);
8858 if (relax_info->allocated_relocs_count == 0)
8859 new_relocs_count = (sec->reloc_count + 2) * 2;
8861 new_relocs_count = (relax_info->allocated_relocs_count + 2) * 2;
8863 new_relocs = (Elf_Internal_Rela *)
8864 bfd_zmalloc (sizeof (Elf_Internal_Rela) * (new_relocs_count));
8868 /* We could handle this more quickly by finding the split point. */
8870 memcpy (new_relocs, *internal_relocs_p,
8871 insert_at * sizeof (Elf_Internal_Rela));
8873 new_relocs[insert_at] = this_rela;
8875 if (insert_at != sec->reloc_count)
8876 memcpy (new_relocs + insert_at + 1,
8877 (*internal_relocs_p) + insert_at,
8878 (sec->reloc_count - insert_at)
8879 * sizeof (Elf_Internal_Rela));
8881 if (*internal_relocs_p != relax_info->allocated_relocs)
8883 /* The first time we re-allocate, we can only free the
8884 old relocs if they were allocated with bfd_malloc.
8885 This is not true when keep_memory is in effect. */
8886 if (!link_info->keep_memory)
8887 free (*internal_relocs_p);
8890 free (*internal_relocs_p);
8891 relax_info->allocated_relocs = new_relocs;
8892 relax_info->allocated_relocs_count = new_relocs_count;
8893 elf_section_data (sec)->relocs = new_relocs;
8895 relax_info->relocs_count = sec->reloc_count;
8896 *internal_relocs_p = new_relocs;
8900 if (insert_at != sec->reloc_count)
8903 for (idx = sec->reloc_count; idx > insert_at; idx--)
8904 (*internal_relocs_p)[idx] = (*internal_relocs_p)[idx-1];
8906 (*internal_relocs_p)[insert_at] = this_rela;
8908 if (relax_info->allocated_relocs)
8909 relax_info->relocs_count = sec->reloc_count;
8916 /* This is similar to relax_section except that when a target is moved,
8917 we shift addresses up. We also need to modify the size. This
8918 algorithm does NOT allow for relocations into the middle of the
8919 property sections. */
8922 relax_property_section (bfd *abfd,
8924 struct bfd_link_info *link_info)
8926 Elf_Internal_Rela *internal_relocs;
8929 bfd_boolean ok = TRUE;
8930 bfd_boolean is_full_prop_section;
8931 size_t last_zfill_target_offset = 0;
8932 asection *last_zfill_target_sec = NULL;
8933 bfd_size_type sec_size;
8934 bfd_size_type entry_size;
8936 sec_size = bfd_get_section_limit (abfd, sec);
8937 internal_relocs = retrieve_internal_relocs (abfd, sec,
8938 link_info->keep_memory);
8939 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
8940 if (contents == NULL && sec_size != 0)
8946 is_full_prop_section = xtensa_is_proptable_section (sec);
8947 if (is_full_prop_section)
8952 if (internal_relocs)
8954 for (i = 0; i < sec->reloc_count; i++)
8956 Elf_Internal_Rela *irel;
8957 xtensa_relax_info *target_relax_info;
8959 asection *target_sec;
8961 bfd_byte *size_p, *flags_p;
8963 /* Locally change the source address.
8964 Translate the target to the new target address.
8965 If it points to this section and has been removed, MOVE IT.
8966 Also, don't forget to modify the associated SIZE at
8969 irel = &internal_relocs[i];
8970 r_type = ELF32_R_TYPE (irel->r_info);
8971 if (r_type == R_XTENSA_NONE)
8974 /* Find the literal value. */
8975 r_reloc_init (&val.r_rel, abfd, irel, contents, sec_size);
8976 size_p = &contents[irel->r_offset + 4];
8978 if (is_full_prop_section)
8979 flags_p = &contents[irel->r_offset + 8];
8980 BFD_ASSERT (irel->r_offset + entry_size <= sec_size);
8982 target_sec = r_reloc_get_section (&val.r_rel);
8983 target_relax_info = get_xtensa_relax_info (target_sec);
8985 if (target_relax_info
8986 && (target_relax_info->is_relaxable_literal_section
8987 || target_relax_info->is_relaxable_asm_section ))
8989 /* Translate the relocation's destination. */
8990 bfd_vma old_offset = val.r_rel.target_offset;
8992 long old_size, new_size;
8993 text_action *act = target_relax_info->action_list.head;
8994 new_offset = old_offset -
8995 removed_by_actions (&act, old_offset, FALSE);
8997 /* Assert that we are not out of bounds. */
8998 old_size = bfd_get_32 (abfd, size_p);
8999 new_size = old_size;
9003 /* Only the first zero-sized unreachable entry is
9004 allowed to expand. In this case the new offset
9005 should be the offset before the fill and the new
9006 size is the expansion size. For other zero-sized
9007 entries the resulting size should be zero with an
9008 offset before or after the fill address depending
9009 on whether the expanding unreachable entry
9011 if (last_zfill_target_sec == 0
9012 || last_zfill_target_sec != target_sec
9013 || last_zfill_target_offset != old_offset)
9015 bfd_vma new_end_offset = new_offset;
9017 /* Recompute the new_offset, but this time don't
9018 include any fill inserted by relaxation. */
9019 act = target_relax_info->action_list.head;
9020 new_offset = old_offset -
9021 removed_by_actions (&act, old_offset, TRUE);
9023 /* If it is not unreachable and we have not yet
9024 seen an unreachable at this address, place it
9025 before the fill address. */
9026 if (flags_p && (bfd_get_32 (abfd, flags_p)
9027 & XTENSA_PROP_UNREACHABLE) != 0)
9029 new_size = new_end_offset - new_offset;
9031 last_zfill_target_sec = target_sec;
9032 last_zfill_target_offset = old_offset;
9038 removed_by_actions (&act, old_offset + old_size, TRUE);
9040 if (new_size != old_size)
9042 bfd_put_32 (abfd, new_size, size_p);
9043 pin_contents (sec, contents);
9046 if (new_offset != old_offset)
9048 bfd_vma diff = new_offset - old_offset;
9049 irel->r_addend += diff;
9050 pin_internal_relocs (sec, internal_relocs);
9056 /* Combine adjacent property table entries. This is also done in
9057 finish_dynamic_sections() but at that point it's too late to
9058 reclaim the space in the output section, so we do this twice. */
9060 if (internal_relocs && (!link_info->relocatable
9061 || xtensa_is_littable_section (sec)))
9063 Elf_Internal_Rela *last_irel = NULL;
9064 Elf_Internal_Rela *irel, *next_rel, *rel_end;
9065 int removed_bytes = 0;
9067 flagword predef_flags;
9069 predef_flags = xtensa_get_property_predef_flags (sec);
9071 /* Walk over memory and relocations at the same time.
9072 This REQUIRES that the internal_relocs be sorted by offset. */
9073 qsort (internal_relocs, sec->reloc_count, sizeof (Elf_Internal_Rela),
9074 internal_reloc_compare);
9076 pin_internal_relocs (sec, internal_relocs);
9077 pin_contents (sec, contents);
9079 next_rel = internal_relocs;
9080 rel_end = internal_relocs + sec->reloc_count;
9082 BFD_ASSERT (sec->size % entry_size == 0);
9084 for (offset = 0; offset < sec->size; offset += entry_size)
9086 Elf_Internal_Rela *offset_rel, *extra_rel;
9087 bfd_vma bytes_to_remove, size, actual_offset;
9088 bfd_boolean remove_this_rel;
9091 /* Find the first relocation for the entry at the current offset.
9092 Adjust the offsets of any extra relocations for the previous
9097 for (irel = next_rel; irel < rel_end; irel++)
9099 if ((irel->r_offset == offset
9100 && ELF32_R_TYPE (irel->r_info) != R_XTENSA_NONE)
9101 || irel->r_offset > offset)
9106 irel->r_offset -= removed_bytes;
9110 /* Find the next relocation (if there are any left). */
9114 for (irel = offset_rel + 1; irel < rel_end; irel++)
9116 if (ELF32_R_TYPE (irel->r_info) != R_XTENSA_NONE)
9124 /* Check if there are relocations on the current entry. There
9125 should usually be a relocation on the offset field. If there
9126 are relocations on the size or flags, then we can't optimize
9127 this entry. Also, find the next relocation to examine on the
9131 if (offset_rel->r_offset >= offset + entry_size)
9133 next_rel = offset_rel;
9134 /* There are no relocations on the current entry, but we
9135 might still be able to remove it if the size is zero. */
9138 else if (offset_rel->r_offset > offset
9140 && extra_rel->r_offset < offset + entry_size))
9142 /* There is a relocation on the size or flags, so we can't
9143 do anything with this entry. Continue with the next. */
9144 next_rel = offset_rel;
9149 BFD_ASSERT (offset_rel->r_offset == offset);
9150 offset_rel->r_offset -= removed_bytes;
9151 next_rel = offset_rel + 1;
9157 remove_this_rel = FALSE;
9158 bytes_to_remove = 0;
9159 actual_offset = offset - removed_bytes;
9160 size = bfd_get_32 (abfd, &contents[actual_offset + 4]);
9162 if (is_full_prop_section)
9163 flags = bfd_get_32 (abfd, &contents[actual_offset + 8]);
9165 flags = predef_flags;
9168 && (flags & XTENSA_PROP_ALIGN) == 0
9169 && (flags & XTENSA_PROP_UNREACHABLE) == 0)
9171 /* Always remove entries with zero size and no alignment. */
9172 bytes_to_remove = entry_size;
9174 remove_this_rel = TRUE;
9177 && ELF32_R_TYPE (offset_rel->r_info) == R_XTENSA_32)
9183 bfd_get_32 (abfd, &contents[last_irel->r_offset + 4]);
9184 bfd_vma old_address =
9185 (last_irel->r_addend
9186 + bfd_get_32 (abfd, &contents[last_irel->r_offset]));
9187 bfd_vma new_address =
9188 (offset_rel->r_addend
9189 + bfd_get_32 (abfd, &contents[actual_offset]));
9190 if (is_full_prop_section)
9191 old_flags = bfd_get_32
9192 (abfd, &contents[last_irel->r_offset + 8]);
9194 old_flags = predef_flags;
9196 if ((ELF32_R_SYM (offset_rel->r_info)
9197 == ELF32_R_SYM (last_irel->r_info))
9198 && old_address + old_size == new_address
9199 && old_flags == flags
9200 && (old_flags & XTENSA_PROP_INSN_BRANCH_TARGET) == 0
9201 && (old_flags & XTENSA_PROP_INSN_LOOP_TARGET) == 0)
9203 /* Fix the old size. */
9204 bfd_put_32 (abfd, old_size + size,
9205 &contents[last_irel->r_offset + 4]);
9206 bytes_to_remove = entry_size;
9207 remove_this_rel = TRUE;
9210 last_irel = offset_rel;
9213 last_irel = offset_rel;
9216 if (remove_this_rel)
9218 offset_rel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
9219 /* In case this is the last entry, move the relocation offset
9220 to the previous entry, if there is one. */
9221 if (offset_rel->r_offset >= bytes_to_remove)
9222 offset_rel->r_offset -= bytes_to_remove;
9224 offset_rel->r_offset = 0;
9227 if (bytes_to_remove != 0)
9229 removed_bytes += bytes_to_remove;
9230 if (offset + bytes_to_remove < sec->size)
9231 memmove (&contents[actual_offset],
9232 &contents[actual_offset + bytes_to_remove],
9233 sec->size - offset - bytes_to_remove);
9239 /* Fix up any extra relocations on the last entry. */
9240 for (irel = next_rel; irel < rel_end; irel++)
9241 irel->r_offset -= removed_bytes;
9243 /* Clear the removed bytes. */
9244 memset (&contents[sec->size - removed_bytes], 0, removed_bytes);
9246 if (sec->rawsize == 0)
9247 sec->rawsize = sec->size;
9248 sec->size -= removed_bytes;
9250 if (xtensa_is_littable_section (sec))
9252 asection *sgotloc = elf_xtensa_hash_table (link_info)->sgotloc;
9254 sgotloc->size -= removed_bytes;
9260 release_internal_relocs (sec, internal_relocs);
9261 release_contents (sec, contents);
9266 /* Third relaxation pass. */
9268 /* Change symbol values to account for removed literals. */
9271 relax_section_symbols (bfd *abfd, asection *sec)
9273 xtensa_relax_info *relax_info;
9274 unsigned int sec_shndx;
9275 Elf_Internal_Shdr *symtab_hdr;
9276 Elf_Internal_Sym *isymbuf;
9277 unsigned i, num_syms, num_locals;
9279 relax_info = get_xtensa_relax_info (sec);
9280 BFD_ASSERT (relax_info);
9282 if (!relax_info->is_relaxable_literal_section
9283 && !relax_info->is_relaxable_asm_section)
9286 sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
9288 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
9289 isymbuf = retrieve_local_syms (abfd);
9291 num_syms = symtab_hdr->sh_size / sizeof (Elf32_External_Sym);
9292 num_locals = symtab_hdr->sh_info;
9294 /* Adjust the local symbols defined in this section. */
9295 for (i = 0; i < num_locals; i++)
9297 Elf_Internal_Sym *isym = &isymbuf[i];
9299 if (isym->st_shndx == sec_shndx)
9301 text_action *act = relax_info->action_list.head;
9302 bfd_vma orig_addr = isym->st_value;
9304 isym->st_value -= removed_by_actions (&act, orig_addr, FALSE);
9306 if (ELF32_ST_TYPE (isym->st_info) == STT_FUNC)
9308 removed_by_actions (&act, orig_addr + isym->st_size, FALSE);
9312 /* Now adjust the global symbols defined in this section. */
9313 for (i = 0; i < (num_syms - num_locals); i++)
9315 struct elf_link_hash_entry *sym_hash;
9317 sym_hash = elf_sym_hashes (abfd)[i];
9319 if (sym_hash->root.type == bfd_link_hash_warning)
9320 sym_hash = (struct elf_link_hash_entry *) sym_hash->root.u.i.link;
9322 if ((sym_hash->root.type == bfd_link_hash_defined
9323 || sym_hash->root.type == bfd_link_hash_defweak)
9324 && sym_hash->root.u.def.section == sec)
9326 text_action *act = relax_info->action_list.head;
9327 bfd_vma orig_addr = sym_hash->root.u.def.value;
9329 sym_hash->root.u.def.value -=
9330 removed_by_actions (&act, orig_addr, FALSE);
9332 if (sym_hash->type == STT_FUNC)
9334 removed_by_actions (&act, orig_addr + sym_hash->size, FALSE);
9342 /* "Fix" handling functions, called while performing relocations. */
9345 do_fix_for_relocatable_link (Elf_Internal_Rela *rel,
9347 asection *input_section,
9351 asection *sec, *old_sec;
9353 int r_type = ELF32_R_TYPE (rel->r_info);
9356 if (r_type == R_XTENSA_NONE)
9359 fix = get_bfd_fix (input_section, rel->r_offset, r_type);
9363 r_reloc_init (&r_rel, input_bfd, rel, contents,
9364 bfd_get_section_limit (input_bfd, input_section));
9365 old_sec = r_reloc_get_section (&r_rel);
9366 old_offset = r_rel.target_offset;
9368 if (!old_sec || !r_reloc_is_defined (&r_rel))
9370 if (r_type != R_XTENSA_ASM_EXPAND)
9372 (*_bfd_error_handler)
9373 (_("%B(%A+0x%lx): unexpected fix for %s relocation"),
9374 input_bfd, input_section, rel->r_offset,
9375 elf_howto_table[r_type].name);
9378 /* Leave it be. Resolution will happen in a later stage. */
9382 sec = fix->target_sec;
9383 rel->r_addend += ((sec->output_offset + fix->target_offset)
9384 - (old_sec->output_offset + old_offset));
9391 do_fix_for_final_link (Elf_Internal_Rela *rel,
9393 asection *input_section,
9395 bfd_vma *relocationp)
9398 int r_type = ELF32_R_TYPE (rel->r_info);
9402 if (r_type == R_XTENSA_NONE)
9405 fix = get_bfd_fix (input_section, rel->r_offset, r_type);
9409 sec = fix->target_sec;
9411 fixup_diff = rel->r_addend;
9412 if (elf_howto_table[fix->src_type].partial_inplace)
9414 bfd_vma inplace_val;
9415 BFD_ASSERT (fix->src_offset
9416 < bfd_get_section_limit (input_bfd, input_section));
9417 inplace_val = bfd_get_32 (input_bfd, &contents[fix->src_offset]);
9418 fixup_diff += inplace_val;
9421 *relocationp = (sec->output_section->vma
9422 + sec->output_offset
9423 + fix->target_offset - fixup_diff);
9427 /* Miscellaneous utility functions.... */
9430 elf_xtensa_get_plt_section (struct bfd_link_info *info, int chunk)
9432 struct elf_xtensa_link_hash_table *htab;
9438 htab = elf_xtensa_hash_table (info);
9442 dynobj = elf_hash_table (info)->dynobj;
9443 sprintf (plt_name, ".plt.%u", chunk);
9444 return bfd_get_section_by_name (dynobj, plt_name);
9449 elf_xtensa_get_gotplt_section (struct bfd_link_info *info, int chunk)
9451 struct elf_xtensa_link_hash_table *htab;
9457 htab = elf_xtensa_hash_table (info);
9458 return htab->sgotplt;
9461 dynobj = elf_hash_table (info)->dynobj;
9462 sprintf (got_name, ".got.plt.%u", chunk);
9463 return bfd_get_section_by_name (dynobj, got_name);
9467 /* Get the input section for a given symbol index.
9469 . a section symbol, return the section;
9470 . a common symbol, return the common section;
9471 . an undefined symbol, return the undefined section;
9472 . an indirect symbol, follow the links;
9473 . an absolute value, return the absolute section. */
9476 get_elf_r_symndx_section (bfd *abfd, unsigned long r_symndx)
9478 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
9479 asection *target_sec = NULL;
9480 if (r_symndx < symtab_hdr->sh_info)
9482 Elf_Internal_Sym *isymbuf;
9483 unsigned int section_index;
9485 isymbuf = retrieve_local_syms (abfd);
9486 section_index = isymbuf[r_symndx].st_shndx;
9488 if (section_index == SHN_UNDEF)
9489 target_sec = bfd_und_section_ptr;
9490 else if (section_index > 0 && section_index < SHN_LORESERVE)
9491 target_sec = bfd_section_from_elf_index (abfd, section_index);
9492 else if (section_index == SHN_ABS)
9493 target_sec = bfd_abs_section_ptr;
9494 else if (section_index == SHN_COMMON)
9495 target_sec = bfd_com_section_ptr;
9502 unsigned long indx = r_symndx - symtab_hdr->sh_info;
9503 struct elf_link_hash_entry *h = elf_sym_hashes (abfd)[indx];
9505 while (h->root.type == bfd_link_hash_indirect
9506 || h->root.type == bfd_link_hash_warning)
9507 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9509 switch (h->root.type)
9511 case bfd_link_hash_defined:
9512 case bfd_link_hash_defweak:
9513 target_sec = h->root.u.def.section;
9515 case bfd_link_hash_common:
9516 target_sec = bfd_com_section_ptr;
9518 case bfd_link_hash_undefined:
9519 case bfd_link_hash_undefweak:
9520 target_sec = bfd_und_section_ptr;
9522 default: /* New indirect warning. */
9523 target_sec = bfd_und_section_ptr;
9531 static struct elf_link_hash_entry *
9532 get_elf_r_symndx_hash_entry (bfd *abfd, unsigned long r_symndx)
9535 struct elf_link_hash_entry *h;
9536 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
9538 if (r_symndx < symtab_hdr->sh_info)
9541 indx = r_symndx - symtab_hdr->sh_info;
9542 h = elf_sym_hashes (abfd)[indx];
9543 while (h->root.type == bfd_link_hash_indirect
9544 || h->root.type == bfd_link_hash_warning)
9545 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9550 /* Get the section-relative offset for a symbol number. */
9553 get_elf_r_symndx_offset (bfd *abfd, unsigned long r_symndx)
9555 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
9558 if (r_symndx < symtab_hdr->sh_info)
9560 Elf_Internal_Sym *isymbuf;
9561 isymbuf = retrieve_local_syms (abfd);
9562 offset = isymbuf[r_symndx].st_value;
9566 unsigned long indx = r_symndx - symtab_hdr->sh_info;
9567 struct elf_link_hash_entry *h =
9568 elf_sym_hashes (abfd)[indx];
9570 while (h->root.type == bfd_link_hash_indirect
9571 || h->root.type == bfd_link_hash_warning)
9572 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9573 if (h->root.type == bfd_link_hash_defined
9574 || h->root.type == bfd_link_hash_defweak)
9575 offset = h->root.u.def.value;
9582 is_reloc_sym_weak (bfd *abfd, Elf_Internal_Rela *rel)
9584 unsigned long r_symndx = ELF32_R_SYM (rel->r_info);
9585 struct elf_link_hash_entry *h;
9587 h = get_elf_r_symndx_hash_entry (abfd, r_symndx);
9588 if (h && h->root.type == bfd_link_hash_defweak)
9595 pcrel_reloc_fits (xtensa_opcode opc,
9597 bfd_vma self_address,
9598 bfd_vma dest_address)
9600 xtensa_isa isa = xtensa_default_isa;
9601 uint32 valp = dest_address;
9602 if (xtensa_operand_do_reloc (isa, opc, opnd, &valp, self_address)
9603 || xtensa_operand_encode (isa, opc, opnd, &valp))
9610 xtensa_is_property_section (asection *sec)
9612 if (xtensa_is_insntable_section (sec)
9613 || xtensa_is_littable_section (sec)
9614 || xtensa_is_proptable_section (sec))
9622 xtensa_is_insntable_section (asection *sec)
9624 if (CONST_STRNEQ (sec->name, XTENSA_INSN_SEC_NAME)
9625 || CONST_STRNEQ (sec->name, ".gnu.linkonce.x."))
9633 xtensa_is_littable_section (asection *sec)
9635 if (CONST_STRNEQ (sec->name, XTENSA_LIT_SEC_NAME)
9636 || CONST_STRNEQ (sec->name, ".gnu.linkonce.p."))
9644 xtensa_is_proptable_section (asection *sec)
9646 if (CONST_STRNEQ (sec->name, XTENSA_PROP_SEC_NAME)
9647 || CONST_STRNEQ (sec->name, ".gnu.linkonce.prop."))
9655 internal_reloc_compare (const void *ap, const void *bp)
9657 const Elf_Internal_Rela *a = (const Elf_Internal_Rela *) ap;
9658 const Elf_Internal_Rela *b = (const Elf_Internal_Rela *) bp;
9660 if (a->r_offset != b->r_offset)
9661 return (a->r_offset - b->r_offset);
9663 /* We don't need to sort on these criteria for correctness,
9664 but enforcing a more strict ordering prevents unstable qsort
9665 from behaving differently with different implementations.
9666 Without the code below we get correct but different results
9667 on Solaris 2.7 and 2.8. We would like to always produce the
9668 same results no matter the host. */
9670 if (a->r_info != b->r_info)
9671 return (a->r_info - b->r_info);
9673 return (a->r_addend - b->r_addend);
9678 internal_reloc_matches (const void *ap, const void *bp)
9680 const Elf_Internal_Rela *a = (const Elf_Internal_Rela *) ap;
9681 const Elf_Internal_Rela *b = (const Elf_Internal_Rela *) bp;
9683 /* Check if one entry overlaps with the other; this shouldn't happen
9684 except when searching for a match. */
9685 return (a->r_offset - b->r_offset);
9689 /* Predicate function used to look up a section in a particular group. */
9692 match_section_group (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, void *inf)
9694 const char *gname = inf;
9695 const char *group_name = elf_group_name (sec);
9697 return (group_name == gname
9698 || (group_name != NULL
9700 && strcmp (group_name, gname) == 0));
9704 static int linkonce_len = sizeof (".gnu.linkonce.") - 1;
9707 xtensa_get_property_section (asection *sec, const char *base_name)
9709 const char *suffix, *group_name;
9710 char *prop_sec_name;
9713 group_name = elf_group_name (sec);
9716 suffix = strrchr (sec->name, '.');
9717 if (suffix == sec->name)
9719 prop_sec_name = (char *) bfd_malloc (strlen (base_name) + 1
9720 + (suffix ? strlen (suffix) : 0));
9721 strcpy (prop_sec_name, base_name);
9723 strcat (prop_sec_name, suffix);
9725 else if (strncmp (sec->name, ".gnu.linkonce.", linkonce_len) == 0)
9727 char *linkonce_kind = 0;
9729 if (strcmp (base_name, XTENSA_INSN_SEC_NAME) == 0)
9730 linkonce_kind = "x.";
9731 else if (strcmp (base_name, XTENSA_LIT_SEC_NAME) == 0)
9732 linkonce_kind = "p.";
9733 else if (strcmp (base_name, XTENSA_PROP_SEC_NAME) == 0)
9734 linkonce_kind = "prop.";
9738 prop_sec_name = (char *) bfd_malloc (strlen (sec->name)
9739 + strlen (linkonce_kind) + 1);
9740 memcpy (prop_sec_name, ".gnu.linkonce.", linkonce_len);
9741 strcpy (prop_sec_name + linkonce_len, linkonce_kind);
9743 suffix = sec->name + linkonce_len;
9744 /* For backward compatibility, replace "t." instead of inserting
9745 the new linkonce_kind (but not for "prop" sections). */
9746 if (CONST_STRNEQ (suffix, "t.") && linkonce_kind[1] == '.')
9748 strcat (prop_sec_name + linkonce_len, suffix);
9751 prop_sec_name = strdup (base_name);
9753 /* Check if the section already exists. */
9754 prop_sec = bfd_get_section_by_name_if (sec->owner, prop_sec_name,
9755 match_section_group,
9756 (void *) group_name);
9757 /* If not, create it. */
9760 flagword flags = (SEC_RELOC | SEC_HAS_CONTENTS | SEC_READONLY);
9761 flags |= (bfd_get_section_flags (sec->owner, sec)
9762 & (SEC_LINK_ONCE | SEC_LINK_DUPLICATES));
9764 prop_sec = bfd_make_section_anyway_with_flags
9765 (sec->owner, strdup (prop_sec_name), flags);
9769 elf_group_name (prop_sec) = group_name;
9772 free (prop_sec_name);
9778 xtensa_get_property_predef_flags (asection *sec)
9780 if (xtensa_is_insntable_section (sec))
9781 return (XTENSA_PROP_INSN
9782 | XTENSA_PROP_NO_TRANSFORM
9783 | XTENSA_PROP_INSN_NO_REORDER);
9785 if (xtensa_is_littable_section (sec))
9786 return (XTENSA_PROP_LITERAL
9787 | XTENSA_PROP_NO_TRANSFORM
9788 | XTENSA_PROP_INSN_NO_REORDER);
9794 /* Other functions called directly by the linker. */
9797 xtensa_callback_required_dependence (bfd *abfd,
9799 struct bfd_link_info *link_info,
9800 deps_callback_t callback,
9803 Elf_Internal_Rela *internal_relocs;
9806 bfd_boolean ok = TRUE;
9807 bfd_size_type sec_size;
9809 sec_size = bfd_get_section_limit (abfd, sec);
9811 /* ".plt*" sections have no explicit relocations but they contain L32R
9812 instructions that reference the corresponding ".got.plt*" sections. */
9813 if ((sec->flags & SEC_LINKER_CREATED) != 0
9814 && CONST_STRNEQ (sec->name, ".plt"))
9818 /* Find the corresponding ".got.plt*" section. */
9819 if (sec->name[4] == '\0')
9820 sgotplt = bfd_get_section_by_name (sec->owner, ".got.plt");
9826 BFD_ASSERT (sec->name[4] == '.');
9827 chunk = strtol (&sec->name[5], NULL, 10);
9829 sprintf (got_name, ".got.plt.%u", chunk);
9830 sgotplt = bfd_get_section_by_name (sec->owner, got_name);
9832 BFD_ASSERT (sgotplt);
9834 /* Assume worst-case offsets: L32R at the very end of the ".plt"
9835 section referencing a literal at the very beginning of
9836 ".got.plt". This is very close to the real dependence, anyway. */
9837 (*callback) (sec, sec_size, sgotplt, 0, closure);
9840 /* Only ELF files are supported for Xtensa. Check here to avoid a segfault
9841 when building uclibc, which runs "ld -b binary /dev/null". */
9842 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
9845 internal_relocs = retrieve_internal_relocs (abfd, sec,
9846 link_info->keep_memory);
9847 if (internal_relocs == NULL
9848 || sec->reloc_count == 0)
9851 /* Cache the contents for the duration of this scan. */
9852 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
9853 if (contents == NULL && sec_size != 0)
9859 if (!xtensa_default_isa)
9860 xtensa_default_isa = xtensa_isa_init (0, 0);
9862 for (i = 0; i < sec->reloc_count; i++)
9864 Elf_Internal_Rela *irel = &internal_relocs[i];
9865 if (is_l32r_relocation (abfd, sec, contents, irel))
9868 asection *target_sec;
9869 bfd_vma target_offset;
9871 r_reloc_init (&l32r_rel, abfd, irel, contents, sec_size);
9874 /* L32Rs must be local to the input file. */
9875 if (r_reloc_is_defined (&l32r_rel))
9877 target_sec = r_reloc_get_section (&l32r_rel);
9878 target_offset = l32r_rel.target_offset;
9880 (*callback) (sec, irel->r_offset, target_sec, target_offset,
9886 release_internal_relocs (sec, internal_relocs);
9887 release_contents (sec, contents);
9891 /* The default literal sections should always be marked as "code" (i.e.,
9892 SHF_EXECINSTR). This is particularly important for the Linux kernel
9893 module loader so that the literals are not placed after the text. */
9894 static const struct bfd_elf_special_section elf_xtensa_special_sections[] =
9896 { STRING_COMMA_LEN (".fini.literal"), 0, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR },
9897 { STRING_COMMA_LEN (".init.literal"), 0, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR },
9898 { STRING_COMMA_LEN (".literal"), 0, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR },
9899 { STRING_COMMA_LEN (".xtensa.info"), 0, SHT_NOTE, 0 },
9900 { NULL, 0, 0, 0, 0 }
9904 #define TARGET_LITTLE_SYM bfd_elf32_xtensa_le_vec
9905 #define TARGET_LITTLE_NAME "elf32-xtensa-le"
9906 #define TARGET_BIG_SYM bfd_elf32_xtensa_be_vec
9907 #define TARGET_BIG_NAME "elf32-xtensa-be"
9908 #define ELF_ARCH bfd_arch_xtensa
9910 #define ELF_MACHINE_CODE EM_XTENSA
9911 #define ELF_MACHINE_ALT1 EM_XTENSA_OLD
9914 #define ELF_MAXPAGESIZE (1 << XCHAL_MMU_MIN_PTE_PAGE_SIZE)
9915 #else /* !XCHAL_HAVE_MMU */
9916 #define ELF_MAXPAGESIZE 1
9917 #endif /* !XCHAL_HAVE_MMU */
9918 #endif /* ELF_ARCH */
9920 #define elf_backend_can_gc_sections 1
9921 #define elf_backend_can_refcount 1
9922 #define elf_backend_plt_readonly 1
9923 #define elf_backend_got_header_size 4
9924 #define elf_backend_want_dynbss 0
9925 #define elf_backend_want_got_plt 1
9927 #define elf_info_to_howto elf_xtensa_info_to_howto_rela
9929 #define bfd_elf32_bfd_merge_private_bfd_data elf_xtensa_merge_private_bfd_data
9930 #define bfd_elf32_new_section_hook elf_xtensa_new_section_hook
9931 #define bfd_elf32_bfd_print_private_bfd_data elf_xtensa_print_private_bfd_data
9932 #define bfd_elf32_bfd_relax_section elf_xtensa_relax_section
9933 #define bfd_elf32_bfd_reloc_type_lookup elf_xtensa_reloc_type_lookup
9934 #define bfd_elf32_bfd_reloc_name_lookup \
9935 elf_xtensa_reloc_name_lookup
9936 #define bfd_elf32_bfd_set_private_flags elf_xtensa_set_private_flags
9937 #define bfd_elf32_bfd_link_hash_table_create elf_xtensa_link_hash_table_create
9939 #define elf_backend_adjust_dynamic_symbol elf_xtensa_adjust_dynamic_symbol
9940 #define elf_backend_check_relocs elf_xtensa_check_relocs
9941 #define elf_backend_create_dynamic_sections elf_xtensa_create_dynamic_sections
9942 #define elf_backend_discard_info elf_xtensa_discard_info
9943 #define elf_backend_ignore_discarded_relocs elf_xtensa_ignore_discarded_relocs
9944 #define elf_backend_final_write_processing elf_xtensa_final_write_processing
9945 #define elf_backend_finish_dynamic_sections elf_xtensa_finish_dynamic_sections
9946 #define elf_backend_finish_dynamic_symbol elf_xtensa_finish_dynamic_symbol
9947 #define elf_backend_gc_mark_hook elf_xtensa_gc_mark_hook
9948 #define elf_backend_gc_sweep_hook elf_xtensa_gc_sweep_hook
9949 #define elf_backend_grok_prstatus elf_xtensa_grok_prstatus
9950 #define elf_backend_grok_psinfo elf_xtensa_grok_psinfo
9951 #define elf_backend_hide_symbol elf_xtensa_hide_symbol
9952 #define elf_backend_object_p elf_xtensa_object_p
9953 #define elf_backend_reloc_type_class elf_xtensa_reloc_type_class
9954 #define elf_backend_relocate_section elf_xtensa_relocate_section
9955 #define elf_backend_size_dynamic_sections elf_xtensa_size_dynamic_sections
9956 #define elf_backend_omit_section_dynsym \
9957 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
9958 #define elf_backend_special_sections elf_xtensa_special_sections
9959 #define elf_backend_action_discarded elf_xtensa_action_discarded
9961 #include "elf32-target.h"