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 2 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_littable_section (asection *);
107 static int internal_reloc_compare (const void *, const void *);
108 static int internal_reloc_matches (const void *, const void *);
109 extern asection *xtensa_get_property_section (asection *, const char *);
110 static flagword xtensa_get_property_predef_flags (asection *);
112 /* Other functions called directly by the linker. */
114 typedef void (*deps_callback_t)
115 (asection *, bfd_vma, asection *, bfd_vma, void *);
116 extern bfd_boolean xtensa_callback_required_dependence
117 (bfd *, asection *, struct bfd_link_info *, deps_callback_t, void *);
120 /* Globally visible flag for choosing size optimization of NOP removal
121 instead of branch-target-aware minimization for NOP removal.
122 When nonzero, narrow all instructions and remove all NOPs possible
123 around longcall expansions. */
125 int elf32xtensa_size_opt;
128 /* The "new_section_hook" is used to set up a per-section
129 "xtensa_relax_info" data structure with additional information used
130 during relaxation. */
132 typedef struct xtensa_relax_info_struct xtensa_relax_info;
135 /* The GNU tools do not easily allow extending interfaces to pass around
136 the pointer to the Xtensa ISA information, so instead we add a global
137 variable here (in BFD) that can be used by any of the tools that need
140 xtensa_isa xtensa_default_isa;
143 /* When this is true, relocations may have been modified to refer to
144 symbols from other input files. The per-section list of "fix"
145 records needs to be checked when resolving relocations. */
147 static bfd_boolean relaxing_section = FALSE;
149 /* When this is true, during final links, literals that cannot be
150 coalesced and their relocations may be moved to other sections. */
152 int elf32xtensa_no_literal_movement = 1;
155 static reloc_howto_type elf_howto_table[] =
157 HOWTO (R_XTENSA_NONE, 0, 0, 0, FALSE, 0, complain_overflow_dont,
158 bfd_elf_xtensa_reloc, "R_XTENSA_NONE",
159 FALSE, 0x00000000, 0x00000000, FALSE),
160 HOWTO (R_XTENSA_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
161 bfd_elf_xtensa_reloc, "R_XTENSA_32",
162 TRUE, 0xffffffff, 0xffffffff, FALSE),
163 /* Replace a 32-bit value with a value from the runtime linker (only
164 used by linker-generated stub functions). The r_addend value is
165 special: 1 means to substitute a pointer to the runtime linker's
166 dynamic resolver function; 2 means to substitute the link map for
167 the shared object. */
168 HOWTO (R_XTENSA_RTLD, 0, 2, 32, FALSE, 0, complain_overflow_dont,
169 NULL, "R_XTENSA_RTLD",
170 FALSE, 0x00000000, 0x00000000, FALSE),
171 HOWTO (R_XTENSA_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
172 bfd_elf_generic_reloc, "R_XTENSA_GLOB_DAT",
173 FALSE, 0xffffffff, 0xffffffff, FALSE),
174 HOWTO (R_XTENSA_JMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
175 bfd_elf_generic_reloc, "R_XTENSA_JMP_SLOT",
176 FALSE, 0xffffffff, 0xffffffff, FALSE),
177 HOWTO (R_XTENSA_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
178 bfd_elf_generic_reloc, "R_XTENSA_RELATIVE",
179 FALSE, 0xffffffff, 0xffffffff, FALSE),
180 HOWTO (R_XTENSA_PLT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
181 bfd_elf_xtensa_reloc, "R_XTENSA_PLT",
182 FALSE, 0xffffffff, 0xffffffff, FALSE),
184 HOWTO (R_XTENSA_OP0, 0, 0, 0, TRUE, 0, complain_overflow_dont,
185 bfd_elf_xtensa_reloc, "R_XTENSA_OP0",
186 FALSE, 0x00000000, 0x00000000, TRUE),
187 HOWTO (R_XTENSA_OP1, 0, 0, 0, TRUE, 0, complain_overflow_dont,
188 bfd_elf_xtensa_reloc, "R_XTENSA_OP1",
189 FALSE, 0x00000000, 0x00000000, TRUE),
190 HOWTO (R_XTENSA_OP2, 0, 0, 0, TRUE, 0, complain_overflow_dont,
191 bfd_elf_xtensa_reloc, "R_XTENSA_OP2",
192 FALSE, 0x00000000, 0x00000000, TRUE),
193 /* Assembly auto-expansion. */
194 HOWTO (R_XTENSA_ASM_EXPAND, 0, 0, 0, TRUE, 0, complain_overflow_dont,
195 bfd_elf_xtensa_reloc, "R_XTENSA_ASM_EXPAND",
196 FALSE, 0x00000000, 0x00000000, FALSE),
197 /* Relax assembly auto-expansion. */
198 HOWTO (R_XTENSA_ASM_SIMPLIFY, 0, 0, 0, TRUE, 0, complain_overflow_dont,
199 bfd_elf_xtensa_reloc, "R_XTENSA_ASM_SIMPLIFY",
200 FALSE, 0x00000000, 0x00000000, TRUE),
203 /* GNU extension to record C++ vtable hierarchy. */
204 HOWTO (R_XTENSA_GNU_VTINHERIT, 0, 2, 0, FALSE, 0, complain_overflow_dont,
205 NULL, "R_XTENSA_GNU_VTINHERIT",
206 FALSE, 0x00000000, 0x00000000, FALSE),
207 /* GNU extension to record C++ vtable member usage. */
208 HOWTO (R_XTENSA_GNU_VTENTRY, 0, 2, 0, FALSE, 0, complain_overflow_dont,
209 _bfd_elf_rel_vtable_reloc_fn, "R_XTENSA_GNU_VTENTRY",
210 FALSE, 0x00000000, 0x00000000, FALSE),
212 /* Relocations for supporting difference of symbols. */
213 HOWTO (R_XTENSA_DIFF8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
214 bfd_elf_xtensa_reloc, "R_XTENSA_DIFF8",
215 FALSE, 0xffffffff, 0xffffffff, FALSE),
216 HOWTO (R_XTENSA_DIFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
217 bfd_elf_xtensa_reloc, "R_XTENSA_DIFF16",
218 FALSE, 0xffffffff, 0xffffffff, FALSE),
219 HOWTO (R_XTENSA_DIFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
220 bfd_elf_xtensa_reloc, "R_XTENSA_DIFF32",
221 FALSE, 0xffffffff, 0xffffffff, FALSE),
223 /* General immediate operand relocations. */
224 HOWTO (R_XTENSA_SLOT0_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
225 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT0_OP",
226 FALSE, 0x00000000, 0x00000000, TRUE),
227 HOWTO (R_XTENSA_SLOT1_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
228 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT1_OP",
229 FALSE, 0x00000000, 0x00000000, TRUE),
230 HOWTO (R_XTENSA_SLOT2_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
231 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT2_OP",
232 FALSE, 0x00000000, 0x00000000, TRUE),
233 HOWTO (R_XTENSA_SLOT3_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
234 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT3_OP",
235 FALSE, 0x00000000, 0x00000000, TRUE),
236 HOWTO (R_XTENSA_SLOT4_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
237 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT4_OP",
238 FALSE, 0x00000000, 0x00000000, TRUE),
239 HOWTO (R_XTENSA_SLOT5_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
240 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT5_OP",
241 FALSE, 0x00000000, 0x00000000, TRUE),
242 HOWTO (R_XTENSA_SLOT6_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
243 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT6_OP",
244 FALSE, 0x00000000, 0x00000000, TRUE),
245 HOWTO (R_XTENSA_SLOT7_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
246 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT7_OP",
247 FALSE, 0x00000000, 0x00000000, TRUE),
248 HOWTO (R_XTENSA_SLOT8_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
249 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT8_OP",
250 FALSE, 0x00000000, 0x00000000, TRUE),
251 HOWTO (R_XTENSA_SLOT9_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
252 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT9_OP",
253 FALSE, 0x00000000, 0x00000000, TRUE),
254 HOWTO (R_XTENSA_SLOT10_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
255 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT10_OP",
256 FALSE, 0x00000000, 0x00000000, TRUE),
257 HOWTO (R_XTENSA_SLOT11_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
258 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT11_OP",
259 FALSE, 0x00000000, 0x00000000, TRUE),
260 HOWTO (R_XTENSA_SLOT12_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
261 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT12_OP",
262 FALSE, 0x00000000, 0x00000000, TRUE),
263 HOWTO (R_XTENSA_SLOT13_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
264 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT13_OP",
265 FALSE, 0x00000000, 0x00000000, TRUE),
266 HOWTO (R_XTENSA_SLOT14_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
267 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT14_OP",
268 FALSE, 0x00000000, 0x00000000, TRUE),
270 /* "Alternate" relocations. The meaning of these is opcode-specific. */
271 HOWTO (R_XTENSA_SLOT0_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
272 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT0_ALT",
273 FALSE, 0x00000000, 0x00000000, TRUE),
274 HOWTO (R_XTENSA_SLOT1_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
275 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT1_ALT",
276 FALSE, 0x00000000, 0x00000000, TRUE),
277 HOWTO (R_XTENSA_SLOT2_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
278 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT2_ALT",
279 FALSE, 0x00000000, 0x00000000, TRUE),
280 HOWTO (R_XTENSA_SLOT3_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
281 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT3_ALT",
282 FALSE, 0x00000000, 0x00000000, TRUE),
283 HOWTO (R_XTENSA_SLOT4_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
284 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT4_ALT",
285 FALSE, 0x00000000, 0x00000000, TRUE),
286 HOWTO (R_XTENSA_SLOT5_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
287 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT5_ALT",
288 FALSE, 0x00000000, 0x00000000, TRUE),
289 HOWTO (R_XTENSA_SLOT6_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
290 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT6_ALT",
291 FALSE, 0x00000000, 0x00000000, TRUE),
292 HOWTO (R_XTENSA_SLOT7_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
293 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT7_ALT",
294 FALSE, 0x00000000, 0x00000000, TRUE),
295 HOWTO (R_XTENSA_SLOT8_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
296 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT8_ALT",
297 FALSE, 0x00000000, 0x00000000, TRUE),
298 HOWTO (R_XTENSA_SLOT9_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
299 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT9_ALT",
300 FALSE, 0x00000000, 0x00000000, TRUE),
301 HOWTO (R_XTENSA_SLOT10_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
302 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT10_ALT",
303 FALSE, 0x00000000, 0x00000000, TRUE),
304 HOWTO (R_XTENSA_SLOT11_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
305 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT11_ALT",
306 FALSE, 0x00000000, 0x00000000, TRUE),
307 HOWTO (R_XTENSA_SLOT12_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
308 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT12_ALT",
309 FALSE, 0x00000000, 0x00000000, TRUE),
310 HOWTO (R_XTENSA_SLOT13_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
311 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT13_ALT",
312 FALSE, 0x00000000, 0x00000000, TRUE),
313 HOWTO (R_XTENSA_SLOT14_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
314 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT14_ALT",
315 FALSE, 0x00000000, 0x00000000, TRUE)
320 fprintf (stderr, "Xtensa bfd reloc lookup %d (%s)\n", code, str)
325 static reloc_howto_type *
326 elf_xtensa_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
327 bfd_reloc_code_real_type code)
332 TRACE ("BFD_RELOC_NONE");
333 return &elf_howto_table[(unsigned) R_XTENSA_NONE ];
336 TRACE ("BFD_RELOC_32");
337 return &elf_howto_table[(unsigned) R_XTENSA_32 ];
339 case BFD_RELOC_XTENSA_DIFF8:
340 TRACE ("BFD_RELOC_XTENSA_DIFF8");
341 return &elf_howto_table[(unsigned) R_XTENSA_DIFF8 ];
343 case BFD_RELOC_XTENSA_DIFF16:
344 TRACE ("BFD_RELOC_XTENSA_DIFF16");
345 return &elf_howto_table[(unsigned) R_XTENSA_DIFF16 ];
347 case BFD_RELOC_XTENSA_DIFF32:
348 TRACE ("BFD_RELOC_XTENSA_DIFF32");
349 return &elf_howto_table[(unsigned) R_XTENSA_DIFF32 ];
351 case BFD_RELOC_XTENSA_RTLD:
352 TRACE ("BFD_RELOC_XTENSA_RTLD");
353 return &elf_howto_table[(unsigned) R_XTENSA_RTLD ];
355 case BFD_RELOC_XTENSA_GLOB_DAT:
356 TRACE ("BFD_RELOC_XTENSA_GLOB_DAT");
357 return &elf_howto_table[(unsigned) R_XTENSA_GLOB_DAT ];
359 case BFD_RELOC_XTENSA_JMP_SLOT:
360 TRACE ("BFD_RELOC_XTENSA_JMP_SLOT");
361 return &elf_howto_table[(unsigned) R_XTENSA_JMP_SLOT ];
363 case BFD_RELOC_XTENSA_RELATIVE:
364 TRACE ("BFD_RELOC_XTENSA_RELATIVE");
365 return &elf_howto_table[(unsigned) R_XTENSA_RELATIVE ];
367 case BFD_RELOC_XTENSA_PLT:
368 TRACE ("BFD_RELOC_XTENSA_PLT");
369 return &elf_howto_table[(unsigned) R_XTENSA_PLT ];
371 case BFD_RELOC_XTENSA_OP0:
372 TRACE ("BFD_RELOC_XTENSA_OP0");
373 return &elf_howto_table[(unsigned) R_XTENSA_OP0 ];
375 case BFD_RELOC_XTENSA_OP1:
376 TRACE ("BFD_RELOC_XTENSA_OP1");
377 return &elf_howto_table[(unsigned) R_XTENSA_OP1 ];
379 case BFD_RELOC_XTENSA_OP2:
380 TRACE ("BFD_RELOC_XTENSA_OP2");
381 return &elf_howto_table[(unsigned) R_XTENSA_OP2 ];
383 case BFD_RELOC_XTENSA_ASM_EXPAND:
384 TRACE ("BFD_RELOC_XTENSA_ASM_EXPAND");
385 return &elf_howto_table[(unsigned) R_XTENSA_ASM_EXPAND ];
387 case BFD_RELOC_XTENSA_ASM_SIMPLIFY:
388 TRACE ("BFD_RELOC_XTENSA_ASM_SIMPLIFY");
389 return &elf_howto_table[(unsigned) R_XTENSA_ASM_SIMPLIFY ];
391 case BFD_RELOC_VTABLE_INHERIT:
392 TRACE ("BFD_RELOC_VTABLE_INHERIT");
393 return &elf_howto_table[(unsigned) R_XTENSA_GNU_VTINHERIT ];
395 case BFD_RELOC_VTABLE_ENTRY:
396 TRACE ("BFD_RELOC_VTABLE_ENTRY");
397 return &elf_howto_table[(unsigned) R_XTENSA_GNU_VTENTRY ];
400 if (code >= BFD_RELOC_XTENSA_SLOT0_OP
401 && code <= BFD_RELOC_XTENSA_SLOT14_OP)
403 unsigned n = (R_XTENSA_SLOT0_OP +
404 (code - BFD_RELOC_XTENSA_SLOT0_OP));
405 return &elf_howto_table[n];
408 if (code >= BFD_RELOC_XTENSA_SLOT0_ALT
409 && code <= BFD_RELOC_XTENSA_SLOT14_ALT)
411 unsigned n = (R_XTENSA_SLOT0_ALT +
412 (code - BFD_RELOC_XTENSA_SLOT0_ALT));
413 return &elf_howto_table[n];
424 /* Given an ELF "rela" relocation, find the corresponding howto and record
425 it in the BFD internal arelent representation of the relocation. */
428 elf_xtensa_info_to_howto_rela (bfd *abfd ATTRIBUTE_UNUSED,
430 Elf_Internal_Rela *dst)
432 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
434 BFD_ASSERT (r_type < (unsigned int) R_XTENSA_max);
435 cache_ptr->howto = &elf_howto_table[r_type];
439 /* Functions for the Xtensa ELF linker. */
441 /* The name of the dynamic interpreter. This is put in the .interp
444 #define ELF_DYNAMIC_INTERPRETER "/lib/ld.so"
446 /* The size in bytes of an entry in the procedure linkage table.
447 (This does _not_ include the space for the literals associated with
450 #define PLT_ENTRY_SIZE 16
452 /* For _really_ large PLTs, we may need to alternate between literals
453 and code to keep the literals within the 256K range of the L32R
454 instructions in the code. It's unlikely that anyone would ever need
455 such a big PLT, but an arbitrary limit on the PLT size would be bad.
456 Thus, we split the PLT into chunks. Since there's very little
457 overhead (2 extra literals) for each chunk, the chunk size is kept
458 small so that the code for handling multiple chunks get used and
459 tested regularly. With 254 entries, there are 1K of literals for
460 each chunk, and that seems like a nice round number. */
462 #define PLT_ENTRIES_PER_CHUNK 254
464 /* PLT entries are actually used as stub functions for lazy symbol
465 resolution. Once the symbol is resolved, the stub function is never
466 invoked. Note: the 32-byte frame size used here cannot be changed
467 without a corresponding change in the runtime linker. */
469 static const bfd_byte elf_xtensa_be_plt_entry[PLT_ENTRY_SIZE] =
471 0x6c, 0x10, 0x04, /* entry sp, 32 */
472 0x18, 0x00, 0x00, /* l32r a8, [got entry for rtld's resolver] */
473 0x1a, 0x00, 0x00, /* l32r a10, [got entry for rtld's link map] */
474 0x1b, 0x00, 0x00, /* l32r a11, [literal for reloc index] */
475 0x0a, 0x80, 0x00, /* jx a8 */
479 static const bfd_byte elf_xtensa_le_plt_entry[PLT_ENTRY_SIZE] =
481 0x36, 0x41, 0x00, /* entry sp, 32 */
482 0x81, 0x00, 0x00, /* l32r a8, [got entry for rtld's resolver] */
483 0xa1, 0x00, 0x00, /* l32r a10, [got entry for rtld's link map] */
484 0xb1, 0x00, 0x00, /* l32r a11, [literal for reloc index] */
485 0xa0, 0x08, 0x00, /* jx a8 */
489 /* Xtensa ELF linker hash table. */
491 struct elf_xtensa_link_hash_table
493 struct elf_link_hash_table elf;
495 /* Short-cuts to get to dynamic linker sections. */
502 asection *spltlittbl;
504 /* Total count of PLT relocations seen during check_relocs.
505 The actual PLT code must be split into multiple sections and all
506 the sections have to be created before size_dynamic_sections,
507 where we figure out the exact number of PLT entries that will be
508 needed. It is OK if this count is an overestimate, e.g., some
509 relocations may be removed by GC. */
513 /* Get the Xtensa ELF linker hash table from a link_info structure. */
515 #define elf_xtensa_hash_table(p) \
516 ((struct elf_xtensa_link_hash_table *) ((p)->hash))
518 /* Create an Xtensa ELF linker hash table. */
520 static struct bfd_link_hash_table *
521 elf_xtensa_link_hash_table_create (bfd *abfd)
523 struct elf_xtensa_link_hash_table *ret;
524 bfd_size_type amt = sizeof (struct elf_xtensa_link_hash_table);
526 ret = bfd_malloc (amt);
530 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
531 _bfd_elf_link_hash_newfunc,
532 sizeof (struct elf_link_hash_entry)))
544 ret->spltlittbl = NULL;
546 ret->plt_reloc_count = 0;
548 return &ret->elf.root;
551 static inline bfd_boolean
552 elf_xtensa_dynamic_symbol_p (struct elf_link_hash_entry *h,
553 struct bfd_link_info *info)
555 /* Check if we should do dynamic things to this symbol. The
556 "ignore_protected" argument need not be set, because Xtensa code
557 does not require special handling of STV_PROTECTED to make function
558 pointer comparisons work properly. The PLT addresses are never
559 used for function pointers. */
561 return _bfd_elf_dynamic_symbol_p (h, info, 0);
566 property_table_compare (const void *ap, const void *bp)
568 const property_table_entry *a = (const property_table_entry *) ap;
569 const property_table_entry *b = (const property_table_entry *) bp;
571 if (a->address == b->address)
573 if (a->size != b->size)
574 return (a->size - b->size);
576 if ((a->flags & XTENSA_PROP_ALIGN) != (b->flags & XTENSA_PROP_ALIGN))
577 return ((b->flags & XTENSA_PROP_ALIGN)
578 - (a->flags & XTENSA_PROP_ALIGN));
580 if ((a->flags & XTENSA_PROP_ALIGN)
581 && (GET_XTENSA_PROP_ALIGNMENT (a->flags)
582 != GET_XTENSA_PROP_ALIGNMENT (b->flags)))
583 return (GET_XTENSA_PROP_ALIGNMENT (a->flags)
584 - GET_XTENSA_PROP_ALIGNMENT (b->flags));
586 if ((a->flags & XTENSA_PROP_UNREACHABLE)
587 != (b->flags & XTENSA_PROP_UNREACHABLE))
588 return ((b->flags & XTENSA_PROP_UNREACHABLE)
589 - (a->flags & XTENSA_PROP_UNREACHABLE));
591 return (a->flags - b->flags);
594 return (a->address - b->address);
599 property_table_matches (const void *ap, const void *bp)
601 const property_table_entry *a = (const property_table_entry *) ap;
602 const property_table_entry *b = (const property_table_entry *) bp;
604 /* Check if one entry overlaps with the other. */
605 if ((b->address >= a->address && b->address < (a->address + a->size))
606 || (a->address >= b->address && a->address < (b->address + b->size)))
609 return (a->address - b->address);
613 /* Get the literal table or property table entries for the given
614 section. Sets TABLE_P and returns the number of entries. On
615 error, returns a negative value. */
618 xtensa_read_table_entries (bfd *abfd,
620 property_table_entry **table_p,
621 const char *sec_name,
622 bfd_boolean output_addr)
624 asection *table_section;
625 bfd_size_type table_size = 0;
626 bfd_byte *table_data;
627 property_table_entry *blocks;
628 int blk, block_count;
629 bfd_size_type num_records;
630 Elf_Internal_Rela *internal_relocs;
631 bfd_vma section_addr;
632 flagword predef_flags;
633 bfd_size_type table_entry_size;
636 || !(section->flags & SEC_ALLOC)
637 || (section->flags & SEC_DEBUGGING))
643 table_section = xtensa_get_property_section (section, sec_name);
645 table_size = table_section->size;
653 predef_flags = xtensa_get_property_predef_flags (table_section);
654 table_entry_size = 12;
656 table_entry_size -= 4;
658 num_records = table_size / table_entry_size;
659 table_data = retrieve_contents (abfd, table_section, TRUE);
660 blocks = (property_table_entry *)
661 bfd_malloc (num_records * sizeof (property_table_entry));
665 section_addr = section->output_section->vma + section->output_offset;
667 section_addr = section->vma;
669 /* If the file has not yet been relocated, process the relocations
670 and sort out the table entries that apply to the specified section. */
671 internal_relocs = retrieve_internal_relocs (abfd, table_section, TRUE);
672 if (internal_relocs && !table_section->reloc_done)
676 for (i = 0; i < table_section->reloc_count; i++)
678 Elf_Internal_Rela *rel = &internal_relocs[i];
679 unsigned long r_symndx;
681 if (ELF32_R_TYPE (rel->r_info) == R_XTENSA_NONE)
684 BFD_ASSERT (ELF32_R_TYPE (rel->r_info) == R_XTENSA_32);
685 r_symndx = ELF32_R_SYM (rel->r_info);
687 if (get_elf_r_symndx_section (abfd, r_symndx) == section)
689 bfd_vma sym_off = get_elf_r_symndx_offset (abfd, r_symndx);
690 BFD_ASSERT (sym_off == 0);
691 blocks[block_count].address =
692 (section_addr + sym_off + rel->r_addend
693 + bfd_get_32 (abfd, table_data + rel->r_offset));
694 blocks[block_count].size =
695 bfd_get_32 (abfd, table_data + rel->r_offset + 4);
697 blocks[block_count].flags = predef_flags;
699 blocks[block_count].flags =
700 bfd_get_32 (abfd, table_data + rel->r_offset + 8);
707 /* The file has already been relocated and the addresses are
708 already in the table. */
710 bfd_size_type section_limit = bfd_get_section_limit (abfd, section);
712 for (off = 0; off < table_size; off += table_entry_size)
714 bfd_vma address = bfd_get_32 (abfd, table_data + off);
716 if (address >= section_addr
717 && address < section_addr + section_limit)
719 blocks[block_count].address = address;
720 blocks[block_count].size =
721 bfd_get_32 (abfd, table_data + off + 4);
723 blocks[block_count].flags = predef_flags;
725 blocks[block_count].flags =
726 bfd_get_32 (abfd, table_data + off + 8);
732 release_contents (table_section, table_data);
733 release_internal_relocs (table_section, internal_relocs);
737 /* Now sort them into address order for easy reference. */
738 qsort (blocks, block_count, sizeof (property_table_entry),
739 property_table_compare);
741 /* Check that the table contents are valid. Problems may occur,
742 for example, if an unrelocated object file is stripped. */
743 for (blk = 1; blk < block_count; blk++)
745 /* The only circumstance where two entries may legitimately
746 have the same address is when one of them is a zero-size
747 placeholder to mark a place where fill can be inserted.
748 The zero-size entry should come first. */
749 if (blocks[blk - 1].address == blocks[blk].address &&
750 blocks[blk - 1].size != 0)
752 (*_bfd_error_handler) (_("%B(%A): invalid property table"),
754 bfd_set_error (bfd_error_bad_value);
766 static property_table_entry *
767 elf_xtensa_find_property_entry (property_table_entry *property_table,
768 int property_table_size,
771 property_table_entry entry;
772 property_table_entry *rv;
774 if (property_table_size == 0)
777 entry.address = addr;
781 rv = bsearch (&entry, property_table, property_table_size,
782 sizeof (property_table_entry), property_table_matches);
788 elf_xtensa_in_literal_pool (property_table_entry *lit_table,
792 if (elf_xtensa_find_property_entry (lit_table, lit_table_size, addr))
799 /* Look through the relocs for a section during the first phase, and
800 calculate needed space in the dynamic reloc sections. */
803 elf_xtensa_check_relocs (bfd *abfd,
804 struct bfd_link_info *info,
806 const Elf_Internal_Rela *relocs)
808 struct elf_xtensa_link_hash_table *htab;
809 Elf_Internal_Shdr *symtab_hdr;
810 struct elf_link_hash_entry **sym_hashes;
811 const Elf_Internal_Rela *rel;
812 const Elf_Internal_Rela *rel_end;
814 if (info->relocatable)
817 htab = elf_xtensa_hash_table (info);
818 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
819 sym_hashes = elf_sym_hashes (abfd);
821 rel_end = relocs + sec->reloc_count;
822 for (rel = relocs; rel < rel_end; rel++)
825 unsigned long r_symndx;
826 struct elf_link_hash_entry *h;
828 r_symndx = ELF32_R_SYM (rel->r_info);
829 r_type = ELF32_R_TYPE (rel->r_info);
831 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
833 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
838 if (r_symndx < symtab_hdr->sh_info)
842 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
843 while (h->root.type == bfd_link_hash_indirect
844 || h->root.type == bfd_link_hash_warning)
845 h = (struct elf_link_hash_entry *) h->root.u.i.link;
854 if ((sec->flags & SEC_ALLOC) != 0)
856 if (h->got.refcount <= 0)
859 h->got.refcount += 1;
864 /* If this relocation is against a local symbol, then it's
865 exactly the same as a normal local GOT entry. */
869 if ((sec->flags & SEC_ALLOC) != 0)
871 if (h->plt.refcount <= 0)
877 h->plt.refcount += 1;
879 /* Keep track of the total PLT relocation count even if we
880 don't yet know whether the dynamic sections will be
882 htab->plt_reloc_count += 1;
884 if (elf_hash_table (info)->dynamic_sections_created)
886 if (! add_extra_plt_sections (info, htab->plt_reloc_count))
893 if ((sec->flags & SEC_ALLOC) != 0)
895 bfd_signed_vma *local_got_refcounts;
897 /* This is a global offset table entry for a local symbol. */
898 local_got_refcounts = elf_local_got_refcounts (abfd);
899 if (local_got_refcounts == NULL)
903 size = symtab_hdr->sh_info;
904 size *= sizeof (bfd_signed_vma);
905 local_got_refcounts =
906 (bfd_signed_vma *) bfd_zalloc (abfd, size);
907 if (local_got_refcounts == NULL)
909 elf_local_got_refcounts (abfd) = local_got_refcounts;
911 local_got_refcounts[r_symndx] += 1;
918 case R_XTENSA_SLOT0_OP:
919 case R_XTENSA_SLOT1_OP:
920 case R_XTENSA_SLOT2_OP:
921 case R_XTENSA_SLOT3_OP:
922 case R_XTENSA_SLOT4_OP:
923 case R_XTENSA_SLOT5_OP:
924 case R_XTENSA_SLOT6_OP:
925 case R_XTENSA_SLOT7_OP:
926 case R_XTENSA_SLOT8_OP:
927 case R_XTENSA_SLOT9_OP:
928 case R_XTENSA_SLOT10_OP:
929 case R_XTENSA_SLOT11_OP:
930 case R_XTENSA_SLOT12_OP:
931 case R_XTENSA_SLOT13_OP:
932 case R_XTENSA_SLOT14_OP:
933 case R_XTENSA_SLOT0_ALT:
934 case R_XTENSA_SLOT1_ALT:
935 case R_XTENSA_SLOT2_ALT:
936 case R_XTENSA_SLOT3_ALT:
937 case R_XTENSA_SLOT4_ALT:
938 case R_XTENSA_SLOT5_ALT:
939 case R_XTENSA_SLOT6_ALT:
940 case R_XTENSA_SLOT7_ALT:
941 case R_XTENSA_SLOT8_ALT:
942 case R_XTENSA_SLOT9_ALT:
943 case R_XTENSA_SLOT10_ALT:
944 case R_XTENSA_SLOT11_ALT:
945 case R_XTENSA_SLOT12_ALT:
946 case R_XTENSA_SLOT13_ALT:
947 case R_XTENSA_SLOT14_ALT:
948 case R_XTENSA_ASM_EXPAND:
949 case R_XTENSA_ASM_SIMPLIFY:
951 case R_XTENSA_DIFF16:
952 case R_XTENSA_DIFF32:
953 /* Nothing to do for these. */
956 case R_XTENSA_GNU_VTINHERIT:
957 /* This relocation describes the C++ object vtable hierarchy.
958 Reconstruct it for later use during GC. */
959 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
963 case R_XTENSA_GNU_VTENTRY:
964 /* This relocation describes which C++ vtable entries are actually
965 used. Record for later use during GC. */
966 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
980 elf_xtensa_make_sym_local (struct bfd_link_info *info,
981 struct elf_link_hash_entry *h)
985 if (h->plt.refcount > 0)
987 /* Will use RELATIVE relocs instead of JMP_SLOT relocs. */
988 if (h->got.refcount < 0)
990 h->got.refcount += h->plt.refcount;
996 /* Don't need any dynamic relocations at all. */
1004 elf_xtensa_hide_symbol (struct bfd_link_info *info,
1005 struct elf_link_hash_entry *h,
1006 bfd_boolean force_local)
1008 /* For a shared link, move the plt refcount to the got refcount to leave
1009 space for RELATIVE relocs. */
1010 elf_xtensa_make_sym_local (info, h);
1012 _bfd_elf_link_hash_hide_symbol (info, h, force_local);
1016 /* Return the section that should be marked against GC for a given
1020 elf_xtensa_gc_mark_hook (asection *sec,
1021 struct bfd_link_info *info,
1022 Elf_Internal_Rela *rel,
1023 struct elf_link_hash_entry *h,
1024 Elf_Internal_Sym *sym)
1027 switch (ELF32_R_TYPE (rel->r_info))
1029 case R_XTENSA_GNU_VTINHERIT:
1030 case R_XTENSA_GNU_VTENTRY:
1034 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1038 /* Update the GOT & PLT entry reference counts
1039 for the section being removed. */
1042 elf_xtensa_gc_sweep_hook (bfd *abfd,
1043 struct bfd_link_info *info ATTRIBUTE_UNUSED,
1045 const Elf_Internal_Rela *relocs)
1047 Elf_Internal_Shdr *symtab_hdr;
1048 struct elf_link_hash_entry **sym_hashes;
1049 bfd_signed_vma *local_got_refcounts;
1050 const Elf_Internal_Rela *rel, *relend;
1052 if ((sec->flags & SEC_ALLOC) == 0)
1055 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1056 sym_hashes = elf_sym_hashes (abfd);
1057 local_got_refcounts = elf_local_got_refcounts (abfd);
1059 relend = relocs + sec->reloc_count;
1060 for (rel = relocs; rel < relend; rel++)
1062 unsigned long r_symndx;
1063 unsigned int r_type;
1064 struct elf_link_hash_entry *h = NULL;
1066 r_symndx = ELF32_R_SYM (rel->r_info);
1067 if (r_symndx >= symtab_hdr->sh_info)
1069 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1070 while (h->root.type == bfd_link_hash_indirect
1071 || h->root.type == bfd_link_hash_warning)
1072 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1075 r_type = ELF32_R_TYPE (rel->r_info);
1081 if (h->got.refcount > 0)
1088 if (h->plt.refcount > 0)
1093 if (local_got_refcounts[r_symndx] > 0)
1094 local_got_refcounts[r_symndx] -= 1;
1106 /* Create all the dynamic sections. */
1109 elf_xtensa_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
1111 struct elf_xtensa_link_hash_table *htab;
1112 flagword flags, noalloc_flags;
1114 htab = elf_xtensa_hash_table (info);
1116 /* First do all the standard stuff. */
1117 if (! _bfd_elf_create_dynamic_sections (dynobj, info))
1119 htab->splt = bfd_get_section_by_name (dynobj, ".plt");
1120 htab->srelplt = bfd_get_section_by_name (dynobj, ".rela.plt");
1121 htab->sgot = bfd_get_section_by_name (dynobj, ".got");
1122 htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
1124 /* Create any extra PLT sections in case check_relocs has already
1125 been called on all the non-dynamic input files. */
1126 if (! add_extra_plt_sections (info, htab->plt_reloc_count))
1129 noalloc_flags = (SEC_HAS_CONTENTS | SEC_IN_MEMORY
1130 | SEC_LINKER_CREATED | SEC_READONLY);
1131 flags = noalloc_flags | SEC_ALLOC | SEC_LOAD;
1133 /* Mark the ".got.plt" section READONLY. */
1134 if (htab->sgotplt == NULL
1135 || ! bfd_set_section_flags (dynobj, htab->sgotplt, flags))
1138 /* Create ".rela.got". */
1139 htab->srelgot = bfd_make_section_with_flags (dynobj, ".rela.got", flags);
1140 if (htab->srelgot == NULL
1141 || ! bfd_set_section_alignment (dynobj, htab->srelgot, 2))
1144 /* Create ".got.loc" (literal tables for use by dynamic linker). */
1145 htab->sgotloc = bfd_make_section_with_flags (dynobj, ".got.loc", flags);
1146 if (htab->sgotloc == NULL
1147 || ! bfd_set_section_alignment (dynobj, htab->sgotloc, 2))
1150 /* Create ".xt.lit.plt" (literal table for ".got.plt*"). */
1151 htab->spltlittbl = bfd_make_section_with_flags (dynobj, ".xt.lit.plt",
1153 if (htab->spltlittbl == NULL
1154 || ! bfd_set_section_alignment (dynobj, htab->spltlittbl, 2))
1162 add_extra_plt_sections (struct bfd_link_info *info, int count)
1164 bfd *dynobj = elf_hash_table (info)->dynobj;
1167 /* Iterate over all chunks except 0 which uses the standard ".plt" and
1168 ".got.plt" sections. */
1169 for (chunk = count / PLT_ENTRIES_PER_CHUNK; chunk > 0; chunk--)
1175 /* Stop when we find a section has already been created. */
1176 if (elf_xtensa_get_plt_section (info, chunk))
1179 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1180 | SEC_LINKER_CREATED | SEC_READONLY);
1182 sname = (char *) bfd_malloc (10);
1183 sprintf (sname, ".plt.%u", chunk);
1184 s = bfd_make_section_with_flags (dynobj, sname, flags | SEC_CODE);
1186 || ! bfd_set_section_alignment (dynobj, s, 2))
1189 sname = (char *) bfd_malloc (14);
1190 sprintf (sname, ".got.plt.%u", chunk);
1191 s = bfd_make_section_with_flags (dynobj, sname, flags);
1193 || ! bfd_set_section_alignment (dynobj, s, 2))
1201 /* Adjust a symbol defined by a dynamic object and referenced by a
1202 regular object. The current definition is in some section of the
1203 dynamic object, but we're not including those sections. We have to
1204 change the definition to something the rest of the link can
1208 elf_xtensa_adjust_dynamic_symbol (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1209 struct elf_link_hash_entry *h)
1211 /* If this is a weak symbol, and there is a real definition, the
1212 processor independent code will have arranged for us to see the
1213 real definition first, and we can just use the same value. */
1216 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1217 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1218 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1219 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1223 /* This is a reference to a symbol defined by a dynamic object. The
1224 reference must go through the GOT, so there's no need for COPY relocs,
1232 elf_xtensa_fix_refcounts (struct elf_link_hash_entry *h, void *arg)
1234 struct bfd_link_info *info = (struct bfd_link_info *) arg;
1236 if (h->root.type == bfd_link_hash_warning)
1237 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1239 if (! elf_xtensa_dynamic_symbol_p (h, info))
1240 elf_xtensa_make_sym_local (info, h);
1247 elf_xtensa_allocate_plt_size (struct elf_link_hash_entry *h, void *arg)
1249 asection *srelplt = (asection *) arg;
1251 if (h->root.type == bfd_link_hash_warning)
1252 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1254 if (h->plt.refcount > 0)
1255 srelplt->size += (h->plt.refcount * sizeof (Elf32_External_Rela));
1262 elf_xtensa_allocate_got_size (struct elf_link_hash_entry *h, void *arg)
1264 asection *srelgot = (asection *) arg;
1266 if (h->root.type == bfd_link_hash_warning)
1267 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1269 if (h->got.refcount > 0)
1270 srelgot->size += (h->got.refcount * sizeof (Elf32_External_Rela));
1277 elf_xtensa_allocate_local_got_size (struct bfd_link_info *info)
1279 struct elf_xtensa_link_hash_table *htab;
1282 htab = elf_xtensa_hash_table (info);
1284 for (i = info->input_bfds; i; i = i->link_next)
1286 bfd_signed_vma *local_got_refcounts;
1287 bfd_size_type j, cnt;
1288 Elf_Internal_Shdr *symtab_hdr;
1290 local_got_refcounts = elf_local_got_refcounts (i);
1291 if (!local_got_refcounts)
1294 symtab_hdr = &elf_tdata (i)->symtab_hdr;
1295 cnt = symtab_hdr->sh_info;
1297 for (j = 0; j < cnt; ++j)
1299 if (local_got_refcounts[j] > 0)
1300 htab->srelgot->size += (local_got_refcounts[j]
1301 * sizeof (Elf32_External_Rela));
1307 /* Set the sizes of the dynamic sections. */
1310 elf_xtensa_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
1311 struct bfd_link_info *info)
1313 struct elf_xtensa_link_hash_table *htab;
1315 asection *s, *srelplt, *splt, *sgotplt, *srelgot, *spltlittbl, *sgotloc;
1316 bfd_boolean relplt, relgot;
1317 int plt_entries, plt_chunks, chunk;
1322 htab = elf_xtensa_hash_table (info);
1323 dynobj = elf_hash_table (info)->dynobj;
1326 srelgot = htab->srelgot;
1327 srelplt = htab->srelplt;
1329 if (elf_hash_table (info)->dynamic_sections_created)
1331 BFD_ASSERT (htab->srelgot != NULL
1332 && htab->srelplt != NULL
1333 && htab->sgot != NULL
1334 && htab->spltlittbl != NULL
1335 && htab->sgotloc != NULL);
1337 /* Set the contents of the .interp section to the interpreter. */
1338 if (info->executable)
1340 s = bfd_get_section_by_name (dynobj, ".interp");
1343 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
1344 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1347 /* Allocate room for one word in ".got". */
1348 htab->sgot->size = 4;
1350 /* Adjust refcounts for symbols that we now know are not "dynamic". */
1351 elf_link_hash_traverse (elf_hash_table (info),
1352 elf_xtensa_fix_refcounts,
1355 /* Allocate space in ".rela.got" for literals that reference
1357 elf_link_hash_traverse (elf_hash_table (info),
1358 elf_xtensa_allocate_got_size,
1361 /* If we are generating a shared object, we also need space in
1362 ".rela.got" for R_XTENSA_RELATIVE relocs for literals that
1363 reference local symbols. */
1365 elf_xtensa_allocate_local_got_size (info);
1367 /* Allocate space in ".rela.plt" for literals that have PLT entries. */
1368 elf_link_hash_traverse (elf_hash_table (info),
1369 elf_xtensa_allocate_plt_size,
1372 /* Allocate space in ".plt" to match the size of ".rela.plt". For
1373 each PLT entry, we need the PLT code plus a 4-byte literal.
1374 For each chunk of ".plt", we also need two more 4-byte
1375 literals, two corresponding entries in ".rela.got", and an
1376 8-byte entry in ".xt.lit.plt". */
1377 spltlittbl = htab->spltlittbl;
1378 plt_entries = srelplt->size / sizeof (Elf32_External_Rela);
1380 (plt_entries + PLT_ENTRIES_PER_CHUNK - 1) / PLT_ENTRIES_PER_CHUNK;
1382 /* Iterate over all the PLT chunks, including any extra sections
1383 created earlier because the initial count of PLT relocations
1384 was an overestimate. */
1386 (splt = elf_xtensa_get_plt_section (info, chunk)) != NULL;
1391 sgotplt = elf_xtensa_get_gotplt_section (info, chunk);
1392 BFD_ASSERT (sgotplt != NULL);
1394 if (chunk < plt_chunks - 1)
1395 chunk_entries = PLT_ENTRIES_PER_CHUNK;
1396 else if (chunk == plt_chunks - 1)
1397 chunk_entries = plt_entries - (chunk * PLT_ENTRIES_PER_CHUNK);
1401 if (chunk_entries != 0)
1403 sgotplt->size = 4 * (chunk_entries + 2);
1404 splt->size = PLT_ENTRY_SIZE * chunk_entries;
1405 srelgot->size += 2 * sizeof (Elf32_External_Rela);
1406 spltlittbl->size += 8;
1415 /* Allocate space in ".got.loc" to match the total size of all the
1417 sgotloc = htab->sgotloc;
1418 sgotloc->size = spltlittbl->size;
1419 for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link_next)
1421 if (abfd->flags & DYNAMIC)
1423 for (s = abfd->sections; s != NULL; s = s->next)
1425 if (! elf_discarded_section (s)
1426 && xtensa_is_littable_section (s)
1428 sgotloc->size += s->size;
1433 /* Allocate memory for dynamic sections. */
1436 for (s = dynobj->sections; s != NULL; s = s->next)
1440 if ((s->flags & SEC_LINKER_CREATED) == 0)
1443 /* It's OK to base decisions on the section name, because none
1444 of the dynobj section names depend upon the input files. */
1445 name = bfd_get_section_name (dynobj, s);
1447 if (CONST_STRNEQ (name, ".rela"))
1451 if (strcmp (name, ".rela.plt") == 0)
1453 else if (strcmp (name, ".rela.got") == 0)
1456 /* We use the reloc_count field as a counter if we need
1457 to copy relocs into the output file. */
1461 else if (! CONST_STRNEQ (name, ".plt.")
1462 && ! CONST_STRNEQ (name, ".got.plt.")
1463 && strcmp (name, ".got") != 0
1464 && strcmp (name, ".plt") != 0
1465 && strcmp (name, ".got.plt") != 0
1466 && strcmp (name, ".xt.lit.plt") != 0
1467 && strcmp (name, ".got.loc") != 0)
1469 /* It's not one of our sections, so don't allocate space. */
1475 /* If we don't need this section, strip it from the output
1476 file. We must create the ".plt*" and ".got.plt*"
1477 sections in create_dynamic_sections and/or check_relocs
1478 based on a conservative estimate of the PLT relocation
1479 count, because the sections must be created before the
1480 linker maps input sections to output sections. The
1481 linker does that before size_dynamic_sections, where we
1482 compute the exact size of the PLT, so there may be more
1483 of these sections than are actually needed. */
1484 s->flags |= SEC_EXCLUDE;
1486 else if ((s->flags & SEC_HAS_CONTENTS) != 0)
1488 /* Allocate memory for the section contents. */
1489 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
1490 if (s->contents == NULL)
1495 if (elf_hash_table (info)->dynamic_sections_created)
1497 /* Add the special XTENSA_RTLD relocations now. The offsets won't be
1498 known until finish_dynamic_sections, but we need to get the relocs
1499 in place before they are sorted. */
1500 for (chunk = 0; chunk < plt_chunks; chunk++)
1502 Elf_Internal_Rela irela;
1506 irela.r_info = ELF32_R_INFO (0, R_XTENSA_RTLD);
1509 loc = (srelgot->contents
1510 + srelgot->reloc_count * sizeof (Elf32_External_Rela));
1511 bfd_elf32_swap_reloca_out (output_bfd, &irela, loc);
1512 bfd_elf32_swap_reloca_out (output_bfd, &irela,
1513 loc + sizeof (Elf32_External_Rela));
1514 srelgot->reloc_count += 2;
1517 /* Add some entries to the .dynamic section. We fill in the
1518 values later, in elf_xtensa_finish_dynamic_sections, but we
1519 must add the entries now so that we get the correct size for
1520 the .dynamic section. The DT_DEBUG entry is filled in by the
1521 dynamic linker and used by the debugger. */
1522 #define add_dynamic_entry(TAG, VAL) \
1523 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
1525 if (info->executable)
1527 if (!add_dynamic_entry (DT_DEBUG, 0))
1533 if (!add_dynamic_entry (DT_PLTGOT, 0)
1534 || !add_dynamic_entry (DT_PLTRELSZ, 0)
1535 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
1536 || !add_dynamic_entry (DT_JMPREL, 0))
1542 if (!add_dynamic_entry (DT_RELA, 0)
1543 || !add_dynamic_entry (DT_RELASZ, 0)
1544 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
1548 if (!add_dynamic_entry (DT_XTENSA_GOT_LOC_OFF, 0)
1549 || !add_dynamic_entry (DT_XTENSA_GOT_LOC_SZ, 0))
1552 #undef add_dynamic_entry
1558 /* Perform the specified relocation. The instruction at (contents + address)
1559 is modified to set one operand to represent the value in "relocation". The
1560 operand position is determined by the relocation type recorded in the
1563 #define CALL_SEGMENT_BITS (30)
1564 #define CALL_SEGMENT_SIZE (1 << CALL_SEGMENT_BITS)
1566 static bfd_reloc_status_type
1567 elf_xtensa_do_reloc (reloc_howto_type *howto,
1569 asection *input_section,
1573 bfd_boolean is_weak_undef,
1574 char **error_message)
1577 xtensa_opcode opcode;
1578 xtensa_isa isa = xtensa_default_isa;
1579 static xtensa_insnbuf ibuff = NULL;
1580 static xtensa_insnbuf sbuff = NULL;
1581 bfd_vma self_address = 0;
1582 bfd_size_type input_size;
1588 ibuff = xtensa_insnbuf_alloc (isa);
1589 sbuff = xtensa_insnbuf_alloc (isa);
1592 input_size = bfd_get_section_limit (abfd, input_section);
1594 switch (howto->type)
1597 case R_XTENSA_DIFF8:
1598 case R_XTENSA_DIFF16:
1599 case R_XTENSA_DIFF32:
1600 return bfd_reloc_ok;
1602 case R_XTENSA_ASM_EXPAND:
1605 /* Check for windowed CALL across a 1GB boundary. */
1606 xtensa_opcode opcode =
1607 get_expanded_call_opcode (contents + address,
1608 input_size - address, 0);
1609 if (is_windowed_call_opcode (opcode))
1611 self_address = (input_section->output_section->vma
1612 + input_section->output_offset
1614 if ((self_address >> CALL_SEGMENT_BITS)
1615 != (relocation >> CALL_SEGMENT_BITS))
1617 *error_message = "windowed longcall crosses 1GB boundary; "
1619 return bfd_reloc_dangerous;
1623 return bfd_reloc_ok;
1625 case R_XTENSA_ASM_SIMPLIFY:
1627 /* Convert the L32R/CALLX to CALL. */
1628 bfd_reloc_status_type retval =
1629 elf_xtensa_do_asm_simplify (contents, address, input_size,
1631 if (retval != bfd_reloc_ok)
1632 return bfd_reloc_dangerous;
1634 /* The CALL needs to be relocated. Continue below for that part. */
1636 howto = &elf_howto_table[(unsigned) R_XTENSA_SLOT0_OP ];
1644 x = bfd_get_32 (abfd, contents + address);
1646 bfd_put_32 (abfd, x, contents + address);
1648 return bfd_reloc_ok;
1651 /* Only instruction slot-specific relocations handled below.... */
1652 slot = get_relocation_slot (howto->type);
1653 if (slot == XTENSA_UNDEFINED)
1655 *error_message = "unexpected relocation";
1656 return bfd_reloc_dangerous;
1659 /* Read the instruction into a buffer and decode the opcode. */
1660 xtensa_insnbuf_from_chars (isa, ibuff, contents + address,
1661 input_size - address);
1662 fmt = xtensa_format_decode (isa, ibuff);
1663 if (fmt == XTENSA_UNDEFINED)
1665 *error_message = "cannot decode instruction format";
1666 return bfd_reloc_dangerous;
1669 xtensa_format_get_slot (isa, fmt, slot, ibuff, sbuff);
1671 opcode = xtensa_opcode_decode (isa, fmt, slot, sbuff);
1672 if (opcode == XTENSA_UNDEFINED)
1674 *error_message = "cannot decode instruction opcode";
1675 return bfd_reloc_dangerous;
1678 /* Check for opcode-specific "alternate" relocations. */
1679 if (is_alt_relocation (howto->type))
1681 if (opcode == get_l32r_opcode ())
1683 /* Handle the special-case of non-PC-relative L32R instructions. */
1684 bfd *output_bfd = input_section->output_section->owner;
1685 asection *lit4_sec = bfd_get_section_by_name (output_bfd, ".lit4");
1688 *error_message = "relocation references missing .lit4 section";
1689 return bfd_reloc_dangerous;
1691 self_address = ((lit4_sec->vma & ~0xfff)
1692 + 0x40000 - 3); /* -3 to compensate for do_reloc */
1693 newval = relocation;
1696 else if (opcode == get_const16_opcode ())
1698 /* ALT used for high 16 bits. */
1699 newval = relocation >> 16;
1704 /* No other "alternate" relocations currently defined. */
1705 *error_message = "unexpected relocation";
1706 return bfd_reloc_dangerous;
1709 else /* Not an "alternate" relocation.... */
1711 if (opcode == get_const16_opcode ())
1713 newval = relocation & 0xffff;
1718 /* ...normal PC-relative relocation.... */
1720 /* Determine which operand is being relocated. */
1721 opnd = get_relocation_opnd (opcode, howto->type);
1722 if (opnd == XTENSA_UNDEFINED)
1724 *error_message = "unexpected relocation";
1725 return bfd_reloc_dangerous;
1728 if (!howto->pc_relative)
1730 *error_message = "expected PC-relative relocation";
1731 return bfd_reloc_dangerous;
1734 /* Calculate the PC address for this instruction. */
1735 self_address = (input_section->output_section->vma
1736 + input_section->output_offset
1739 newval = relocation;
1743 /* Apply the relocation. */
1744 if (xtensa_operand_do_reloc (isa, opcode, opnd, &newval, self_address)
1745 || xtensa_operand_encode (isa, opcode, opnd, &newval)
1746 || xtensa_operand_set_field (isa, opcode, opnd, fmt, slot,
1749 const char *opname = xtensa_opcode_name (isa, opcode);
1752 msg = "cannot encode";
1753 if (is_direct_call_opcode (opcode))
1755 if ((relocation & 0x3) != 0)
1756 msg = "misaligned call target";
1758 msg = "call target out of range";
1760 else if (opcode == get_l32r_opcode ())
1762 if ((relocation & 0x3) != 0)
1763 msg = "misaligned literal target";
1764 else if (is_alt_relocation (howto->type))
1765 msg = "literal target out of range (too many literals)";
1766 else if (self_address > relocation)
1767 msg = "literal target out of range (try using text-section-literals)";
1769 msg = "literal placed after use";
1772 *error_message = vsprint_msg (opname, ": %s", strlen (msg) + 2, msg);
1773 return bfd_reloc_dangerous;
1776 /* Check for calls across 1GB boundaries. */
1777 if (is_direct_call_opcode (opcode)
1778 && is_windowed_call_opcode (opcode))
1780 if ((self_address >> CALL_SEGMENT_BITS)
1781 != (relocation >> CALL_SEGMENT_BITS))
1784 "windowed call crosses 1GB boundary; return may fail";
1785 return bfd_reloc_dangerous;
1789 /* Write the modified instruction back out of the buffer. */
1790 xtensa_format_set_slot (isa, fmt, slot, ibuff, sbuff);
1791 xtensa_insnbuf_to_chars (isa, ibuff, contents + address,
1792 input_size - address);
1793 return bfd_reloc_ok;
1798 vsprint_msg (const char *origmsg, const char *fmt, int arglen, ...)
1800 /* To reduce the size of the memory leak,
1801 we only use a single message buffer. */
1802 static bfd_size_type alloc_size = 0;
1803 static char *message = NULL;
1804 bfd_size_type orig_len, len = 0;
1805 bfd_boolean is_append;
1807 VA_OPEN (ap, arglen);
1808 VA_FIXEDARG (ap, const char *, origmsg);
1810 is_append = (origmsg == message);
1812 orig_len = strlen (origmsg);
1813 len = orig_len + strlen (fmt) + arglen + 20;
1814 if (len > alloc_size)
1816 message = (char *) bfd_realloc (message, len);
1820 memcpy (message, origmsg, orig_len);
1821 vsprintf (message + orig_len, fmt, ap);
1827 /* This function is registered as the "special_function" in the
1828 Xtensa howto for handling simplify operations.
1829 bfd_perform_relocation / bfd_install_relocation use it to
1830 perform (install) the specified relocation. Since this replaces the code
1831 in bfd_perform_relocation, it is basically an Xtensa-specific,
1832 stripped-down version of bfd_perform_relocation. */
1834 static bfd_reloc_status_type
1835 bfd_elf_xtensa_reloc (bfd *abfd,
1836 arelent *reloc_entry,
1839 asection *input_section,
1841 char **error_message)
1844 bfd_reloc_status_type flag;
1845 bfd_size_type octets = reloc_entry->address * bfd_octets_per_byte (abfd);
1846 bfd_vma output_base = 0;
1847 reloc_howto_type *howto = reloc_entry->howto;
1848 asection *reloc_target_output_section;
1849 bfd_boolean is_weak_undef;
1851 if (!xtensa_default_isa)
1852 xtensa_default_isa = xtensa_isa_init (0, 0);
1854 /* ELF relocs are against symbols. If we are producing relocatable
1855 output, and the reloc is against an external symbol, the resulting
1856 reloc will also be against the same symbol. In such a case, we
1857 don't want to change anything about the way the reloc is handled,
1858 since it will all be done at final link time. This test is similar
1859 to what bfd_elf_generic_reloc does except that it lets relocs with
1860 howto->partial_inplace go through even if the addend is non-zero.
1861 (The real problem is that partial_inplace is set for XTENSA_32
1862 relocs to begin with, but that's a long story and there's little we
1863 can do about it now....) */
1865 if (output_bfd && (symbol->flags & BSF_SECTION_SYM) == 0)
1867 reloc_entry->address += input_section->output_offset;
1868 return bfd_reloc_ok;
1871 /* Is the address of the relocation really within the section? */
1872 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section))
1873 return bfd_reloc_outofrange;
1875 /* Work out which section the relocation is targeted at and the
1876 initial relocation command value. */
1878 /* Get symbol value. (Common symbols are special.) */
1879 if (bfd_is_com_section (symbol->section))
1882 relocation = symbol->value;
1884 reloc_target_output_section = symbol->section->output_section;
1886 /* Convert input-section-relative symbol value to absolute. */
1887 if ((output_bfd && !howto->partial_inplace)
1888 || reloc_target_output_section == NULL)
1891 output_base = reloc_target_output_section->vma;
1893 relocation += output_base + symbol->section->output_offset;
1895 /* Add in supplied addend. */
1896 relocation += reloc_entry->addend;
1898 /* Here the variable relocation holds the final address of the
1899 symbol we are relocating against, plus any addend. */
1902 if (!howto->partial_inplace)
1904 /* This is a partial relocation, and we want to apply the relocation
1905 to the reloc entry rather than the raw data. Everything except
1906 relocations against section symbols has already been handled
1909 BFD_ASSERT (symbol->flags & BSF_SECTION_SYM);
1910 reloc_entry->addend = relocation;
1911 reloc_entry->address += input_section->output_offset;
1912 return bfd_reloc_ok;
1916 reloc_entry->address += input_section->output_offset;
1917 reloc_entry->addend = 0;
1921 is_weak_undef = (bfd_is_und_section (symbol->section)
1922 && (symbol->flags & BSF_WEAK) != 0);
1923 flag = elf_xtensa_do_reloc (howto, abfd, input_section, relocation,
1924 (bfd_byte *) data, (bfd_vma) octets,
1925 is_weak_undef, error_message);
1927 if (flag == bfd_reloc_dangerous)
1929 /* Add the symbol name to the error message. */
1930 if (! *error_message)
1931 *error_message = "";
1932 *error_message = vsprint_msg (*error_message, ": (%s + 0x%lx)",
1933 strlen (symbol->name) + 17,
1935 (unsigned long) reloc_entry->addend);
1942 /* Set up an entry in the procedure linkage table. */
1945 elf_xtensa_create_plt_entry (struct bfd_link_info *info,
1947 unsigned reloc_index)
1949 asection *splt, *sgotplt;
1950 bfd_vma plt_base, got_base;
1951 bfd_vma code_offset, lit_offset;
1954 chunk = reloc_index / PLT_ENTRIES_PER_CHUNK;
1955 splt = elf_xtensa_get_plt_section (info, chunk);
1956 sgotplt = elf_xtensa_get_gotplt_section (info, chunk);
1957 BFD_ASSERT (splt != NULL && sgotplt != NULL);
1959 plt_base = splt->output_section->vma + splt->output_offset;
1960 got_base = sgotplt->output_section->vma + sgotplt->output_offset;
1962 lit_offset = 8 + (reloc_index % PLT_ENTRIES_PER_CHUNK) * 4;
1963 code_offset = (reloc_index % PLT_ENTRIES_PER_CHUNK) * PLT_ENTRY_SIZE;
1965 /* Fill in the literal entry. This is the offset of the dynamic
1966 relocation entry. */
1967 bfd_put_32 (output_bfd, reloc_index * sizeof (Elf32_External_Rela),
1968 sgotplt->contents + lit_offset);
1970 /* Fill in the entry in the procedure linkage table. */
1971 memcpy (splt->contents + code_offset,
1972 (bfd_big_endian (output_bfd)
1973 ? elf_xtensa_be_plt_entry
1974 : elf_xtensa_le_plt_entry),
1976 bfd_put_16 (output_bfd, l32r_offset (got_base + 0,
1977 plt_base + code_offset + 3),
1978 splt->contents + code_offset + 4);
1979 bfd_put_16 (output_bfd, l32r_offset (got_base + 4,
1980 plt_base + code_offset + 6),
1981 splt->contents + code_offset + 7);
1982 bfd_put_16 (output_bfd, l32r_offset (got_base + lit_offset,
1983 plt_base + code_offset + 9),
1984 splt->contents + code_offset + 10);
1986 return plt_base + code_offset;
1990 /* Relocate an Xtensa ELF section. This is invoked by the linker for
1991 both relocatable and final links. */
1994 elf_xtensa_relocate_section (bfd *output_bfd,
1995 struct bfd_link_info *info,
1997 asection *input_section,
1999 Elf_Internal_Rela *relocs,
2000 Elf_Internal_Sym *local_syms,
2001 asection **local_sections)
2003 struct elf_xtensa_link_hash_table *htab;
2004 Elf_Internal_Shdr *symtab_hdr;
2005 Elf_Internal_Rela *rel;
2006 Elf_Internal_Rela *relend;
2007 struct elf_link_hash_entry **sym_hashes;
2008 property_table_entry *lit_table = 0;
2010 char *error_message = NULL;
2011 bfd_size_type input_size;
2013 if (!xtensa_default_isa)
2014 xtensa_default_isa = xtensa_isa_init (0, 0);
2016 htab = elf_xtensa_hash_table (info);
2017 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
2018 sym_hashes = elf_sym_hashes (input_bfd);
2020 if (elf_hash_table (info)->dynamic_sections_created)
2022 ltblsize = xtensa_read_table_entries (input_bfd, input_section,
2023 &lit_table, XTENSA_LIT_SEC_NAME,
2029 input_size = bfd_get_section_limit (input_bfd, input_section);
2032 relend = relocs + input_section->reloc_count;
2033 for (; rel < relend; rel++)
2036 reloc_howto_type *howto;
2037 unsigned long r_symndx;
2038 struct elf_link_hash_entry *h;
2039 Elf_Internal_Sym *sym;
2042 bfd_reloc_status_type r;
2043 bfd_boolean is_weak_undef;
2044 bfd_boolean unresolved_reloc;
2047 r_type = ELF32_R_TYPE (rel->r_info);
2048 if (r_type == (int) R_XTENSA_GNU_VTINHERIT
2049 || r_type == (int) R_XTENSA_GNU_VTENTRY)
2052 if (r_type < 0 || r_type >= (int) R_XTENSA_max)
2054 bfd_set_error (bfd_error_bad_value);
2057 howto = &elf_howto_table[r_type];
2059 r_symndx = ELF32_R_SYM (rel->r_info);
2061 if (info->relocatable)
2063 /* This is a relocatable link.
2064 1) If the reloc is against a section symbol, adjust
2065 according to the output section.
2066 2) If there is a new target for this relocation,
2067 the new target will be in the same output section.
2068 We adjust the relocation by the output section
2071 if (relaxing_section)
2073 /* Check if this references a section in another input file. */
2074 if (!do_fix_for_relocatable_link (rel, input_bfd, input_section,
2077 r_type = ELF32_R_TYPE (rel->r_info);
2080 if (r_type == R_XTENSA_ASM_SIMPLIFY)
2082 char *error_message = NULL;
2083 /* Convert ASM_SIMPLIFY into the simpler relocation
2084 so that they never escape a relaxing link. */
2085 r = contract_asm_expansion (contents, input_size, rel,
2087 if (r != bfd_reloc_ok)
2089 if (!((*info->callbacks->reloc_dangerous)
2090 (info, error_message, input_bfd, input_section,
2094 r_type = ELF32_R_TYPE (rel->r_info);
2097 /* This is a relocatable link, so we don't have to change
2098 anything unless the reloc is against a section symbol,
2099 in which case we have to adjust according to where the
2100 section symbol winds up in the output section. */
2101 if (r_symndx < symtab_hdr->sh_info)
2103 sym = local_syms + r_symndx;
2104 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
2106 sec = local_sections[r_symndx];
2107 rel->r_addend += sec->output_offset + sym->st_value;
2111 /* If there is an addend with a partial_inplace howto,
2112 then move the addend to the contents. This is a hack
2113 to work around problems with DWARF in relocatable links
2114 with some previous version of BFD. Now we can't easily get
2115 rid of the hack without breaking backward compatibility.... */
2118 howto = &elf_howto_table[r_type];
2119 if (howto->partial_inplace)
2121 r = elf_xtensa_do_reloc (howto, input_bfd, input_section,
2122 rel->r_addend, contents,
2123 rel->r_offset, FALSE,
2125 if (r != bfd_reloc_ok)
2127 if (!((*info->callbacks->reloc_dangerous)
2128 (info, error_message, input_bfd, input_section,
2136 /* Done with work for relocatable link; continue with next reloc. */
2140 /* This is a final link. */
2145 is_weak_undef = FALSE;
2146 unresolved_reloc = FALSE;
2149 if (howto->partial_inplace)
2151 /* Because R_XTENSA_32 was made partial_inplace to fix some
2152 problems with DWARF info in partial links, there may be
2153 an addend stored in the contents. Take it out of there
2154 and move it back into the addend field of the reloc. */
2155 rel->r_addend += bfd_get_32 (input_bfd, contents + rel->r_offset);
2156 bfd_put_32 (input_bfd, 0, contents + rel->r_offset);
2159 if (r_symndx < symtab_hdr->sh_info)
2161 sym = local_syms + r_symndx;
2162 sec = local_sections[r_symndx];
2163 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
2167 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2168 r_symndx, symtab_hdr, sym_hashes,
2170 unresolved_reloc, warned);
2173 && !unresolved_reloc
2174 && h->root.type == bfd_link_hash_undefweak)
2175 is_weak_undef = TRUE;
2178 if (relaxing_section)
2180 /* Check if this references a section in another input file. */
2181 do_fix_for_final_link (rel, input_bfd, input_section, contents,
2184 /* Update some already cached values. */
2185 r_type = ELF32_R_TYPE (rel->r_info);
2186 howto = &elf_howto_table[r_type];
2189 /* Sanity check the address. */
2190 if (rel->r_offset >= input_size
2191 && ELF32_R_TYPE (rel->r_info) != R_XTENSA_NONE)
2193 (*_bfd_error_handler)
2194 (_("%B(%A+0x%lx): relocation offset out of range (size=0x%x)"),
2195 input_bfd, input_section, rel->r_offset, input_size);
2196 bfd_set_error (bfd_error_bad_value);
2200 /* Generate dynamic relocations. */
2201 if (elf_hash_table (info)->dynamic_sections_created)
2203 bfd_boolean dynamic_symbol = elf_xtensa_dynamic_symbol_p (h, info);
2205 if (dynamic_symbol && is_operand_relocation (r_type))
2207 /* This is an error. The symbol's real value won't be known
2208 until runtime and it's likely to be out of range anyway. */
2209 const char *name = h->root.root.string;
2210 error_message = vsprint_msg ("invalid relocation for dynamic "
2212 strlen (name) + 2, name);
2213 if (!((*info->callbacks->reloc_dangerous)
2214 (info, error_message, input_bfd, input_section,
2218 else if ((r_type == R_XTENSA_32 || r_type == R_XTENSA_PLT)
2219 && (input_section->flags & SEC_ALLOC) != 0
2220 && (dynamic_symbol || info->shared))
2222 Elf_Internal_Rela outrel;
2226 if (dynamic_symbol && r_type == R_XTENSA_PLT)
2227 srel = htab->srelplt;
2229 srel = htab->srelgot;
2231 BFD_ASSERT (srel != NULL);
2234 _bfd_elf_section_offset (output_bfd, info,
2235 input_section, rel->r_offset);
2237 if ((outrel.r_offset | 1) == (bfd_vma) -1)
2238 memset (&outrel, 0, sizeof outrel);
2241 outrel.r_offset += (input_section->output_section->vma
2242 + input_section->output_offset);
2244 /* Complain if the relocation is in a read-only section
2245 and not in a literal pool. */
2246 if ((input_section->flags & SEC_READONLY) != 0
2247 && !elf_xtensa_in_literal_pool (lit_table, ltblsize,
2251 _("dynamic relocation in read-only section");
2252 if (!((*info->callbacks->reloc_dangerous)
2253 (info, error_message, input_bfd, input_section,
2260 outrel.r_addend = rel->r_addend;
2263 if (r_type == R_XTENSA_32)
2266 ELF32_R_INFO (h->dynindx, R_XTENSA_GLOB_DAT);
2269 else /* r_type == R_XTENSA_PLT */
2272 ELF32_R_INFO (h->dynindx, R_XTENSA_JMP_SLOT);
2274 /* Create the PLT entry and set the initial
2275 contents of the literal entry to the address of
2278 elf_xtensa_create_plt_entry (info, output_bfd,
2281 unresolved_reloc = FALSE;
2285 /* Generate a RELATIVE relocation. */
2286 outrel.r_info = ELF32_R_INFO (0, R_XTENSA_RELATIVE);
2287 outrel.r_addend = 0;
2291 loc = (srel->contents
2292 + srel->reloc_count++ * sizeof (Elf32_External_Rela));
2293 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2294 BFD_ASSERT (sizeof (Elf32_External_Rela) * srel->reloc_count
2299 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
2300 because such sections are not SEC_ALLOC and thus ld.so will
2301 not process them. */
2302 if (unresolved_reloc
2303 && !((input_section->flags & SEC_DEBUGGING) != 0
2306 (*_bfd_error_handler)
2307 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
2310 (long) rel->r_offset,
2312 h->root.root.string);
2318 /* r_symndx will be zero only for relocs against symbols from
2319 removed linkonce sections, or sections discarded by a linker
2320 script. For these relocs, we just want the section contents
2321 zeroed. Avoid any special processing. */
2322 _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset);
2326 /* There's no point in calling bfd_perform_relocation here.
2327 Just go directly to our "special function". */
2328 r = elf_xtensa_do_reloc (howto, input_bfd, input_section,
2329 relocation + rel->r_addend,
2330 contents, rel->r_offset, is_weak_undef,
2333 if (r != bfd_reloc_ok && !warned)
2337 BFD_ASSERT (r == bfd_reloc_dangerous || r == bfd_reloc_other);
2338 BFD_ASSERT (error_message != NULL);
2341 name = h->root.root.string;
2344 name = bfd_elf_string_from_elf_section
2345 (input_bfd, symtab_hdr->sh_link, sym->st_name);
2346 if (name && *name == '\0')
2347 name = bfd_section_name (input_bfd, sec);
2351 if (rel->r_addend == 0)
2352 error_message = vsprint_msg (error_message, ": %s",
2353 strlen (name) + 2, name);
2355 error_message = vsprint_msg (error_message, ": (%s+0x%x)",
2357 name, (int)rel->r_addend);
2360 if (!((*info->callbacks->reloc_dangerous)
2361 (info, error_message, input_bfd, input_section,
2370 input_section->reloc_done = TRUE;
2376 /* Finish up dynamic symbol handling. There's not much to do here since
2377 the PLT and GOT entries are all set up by relocate_section. */
2380 elf_xtensa_finish_dynamic_symbol (bfd *output_bfd ATTRIBUTE_UNUSED,
2381 struct bfd_link_info *info ATTRIBUTE_UNUSED,
2382 struct elf_link_hash_entry *h,
2383 Elf_Internal_Sym *sym)
2385 if (h->needs_plt && !h->def_regular)
2387 /* Mark the symbol as undefined, rather than as defined in
2388 the .plt section. Leave the value alone. */
2389 sym->st_shndx = SHN_UNDEF;
2390 /* If the symbol is weak, we do need to clear the value.
2391 Otherwise, the PLT entry would provide a definition for
2392 the symbol even if the symbol wasn't defined anywhere,
2393 and so the symbol would never be NULL. */
2394 if (!h->ref_regular_nonweak)
2398 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
2399 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
2400 || h == elf_hash_table (info)->hgot)
2401 sym->st_shndx = SHN_ABS;
2407 /* Combine adjacent literal table entries in the output. Adjacent
2408 entries within each input section may have been removed during
2409 relaxation, but we repeat the process here, even though it's too late
2410 to shrink the output section, because it's important to minimize the
2411 number of literal table entries to reduce the start-up work for the
2412 runtime linker. Returns the number of remaining table entries or -1
2416 elf_xtensa_combine_prop_entries (bfd *output_bfd,
2421 property_table_entry *table;
2422 bfd_size_type section_size, sgotloc_size;
2426 section_size = sxtlit->size;
2427 BFD_ASSERT (section_size % 8 == 0);
2428 num = section_size / 8;
2430 sgotloc_size = sgotloc->size;
2431 if (sgotloc_size != section_size)
2433 (*_bfd_error_handler)
2434 (_("internal inconsistency in size of .got.loc section"));
2438 table = bfd_malloc (num * sizeof (property_table_entry));
2442 /* The ".xt.lit.plt" section has the SEC_IN_MEMORY flag set and this
2443 propagates to the output section, where it doesn't really apply and
2444 where it breaks the following call to bfd_malloc_and_get_section. */
2445 sxtlit->flags &= ~SEC_IN_MEMORY;
2447 if (!bfd_malloc_and_get_section (output_bfd, sxtlit, &contents))
2455 /* There should never be any relocations left at this point, so this
2456 is quite a bit easier than what is done during relaxation. */
2458 /* Copy the raw contents into a property table array and sort it. */
2460 for (n = 0; n < num; n++)
2462 table[n].address = bfd_get_32 (output_bfd, &contents[offset]);
2463 table[n].size = bfd_get_32 (output_bfd, &contents[offset + 4]);
2466 qsort (table, num, sizeof (property_table_entry), property_table_compare);
2468 for (n = 0; n < num; n++)
2470 bfd_boolean remove = FALSE;
2472 if (table[n].size == 0)
2475 (table[n-1].address + table[n-1].size == table[n].address))
2477 table[n-1].size += table[n].size;
2483 for (m = n; m < num - 1; m++)
2485 table[m].address = table[m+1].address;
2486 table[m].size = table[m+1].size;
2494 /* Copy the data back to the raw contents. */
2496 for (n = 0; n < num; n++)
2498 bfd_put_32 (output_bfd, table[n].address, &contents[offset]);
2499 bfd_put_32 (output_bfd, table[n].size, &contents[offset + 4]);
2503 /* Clear the removed bytes. */
2504 if ((bfd_size_type) (num * 8) < section_size)
2505 memset (&contents[num * 8], 0, section_size - num * 8);
2507 if (! bfd_set_section_contents (output_bfd, sxtlit, contents, 0,
2511 /* Copy the contents to ".got.loc". */
2512 memcpy (sgotloc->contents, contents, section_size);
2520 /* Finish up the dynamic sections. */
2523 elf_xtensa_finish_dynamic_sections (bfd *output_bfd,
2524 struct bfd_link_info *info)
2526 struct elf_xtensa_link_hash_table *htab;
2528 asection *sdyn, *srelplt, *sgot, *sxtlit, *sgotloc;
2529 Elf32_External_Dyn *dyncon, *dynconend;
2530 int num_xtlit_entries;
2532 if (! elf_hash_table (info)->dynamic_sections_created)
2535 htab = elf_xtensa_hash_table (info);
2536 dynobj = elf_hash_table (info)->dynobj;
2537 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
2538 BFD_ASSERT (sdyn != NULL);
2540 /* Set the first entry in the global offset table to the address of
2541 the dynamic section. */
2545 BFD_ASSERT (sgot->size == 4);
2547 bfd_put_32 (output_bfd, 0, sgot->contents);
2549 bfd_put_32 (output_bfd,
2550 sdyn->output_section->vma + sdyn->output_offset,
2554 srelplt = htab->srelplt;
2555 if (srelplt && srelplt->size != 0)
2557 asection *sgotplt, *srelgot, *spltlittbl;
2558 int chunk, plt_chunks, plt_entries;
2559 Elf_Internal_Rela irela;
2561 unsigned rtld_reloc;
2563 srelgot = htab->srelgot;
2564 spltlittbl = htab->spltlittbl;
2565 BFD_ASSERT (srelgot != NULL && spltlittbl != NULL);
2567 /* Find the first XTENSA_RTLD relocation. Presumably the rest
2568 of them follow immediately after.... */
2569 for (rtld_reloc = 0; rtld_reloc < srelgot->reloc_count; rtld_reloc++)
2571 loc = srelgot->contents + rtld_reloc * sizeof (Elf32_External_Rela);
2572 bfd_elf32_swap_reloca_in (output_bfd, loc, &irela);
2573 if (ELF32_R_TYPE (irela.r_info) == R_XTENSA_RTLD)
2576 BFD_ASSERT (rtld_reloc < srelgot->reloc_count);
2578 plt_entries = srelplt->size / sizeof (Elf32_External_Rela);
2580 (plt_entries + PLT_ENTRIES_PER_CHUNK - 1) / PLT_ENTRIES_PER_CHUNK;
2582 for (chunk = 0; chunk < plt_chunks; chunk++)
2584 int chunk_entries = 0;
2586 sgotplt = elf_xtensa_get_gotplt_section (info, chunk);
2587 BFD_ASSERT (sgotplt != NULL);
2589 /* Emit special RTLD relocations for the first two entries in
2590 each chunk of the .got.plt section. */
2592 loc = srelgot->contents + rtld_reloc * sizeof (Elf32_External_Rela);
2593 bfd_elf32_swap_reloca_in (output_bfd, loc, &irela);
2594 BFD_ASSERT (ELF32_R_TYPE (irela.r_info) == R_XTENSA_RTLD);
2595 irela.r_offset = (sgotplt->output_section->vma
2596 + sgotplt->output_offset);
2597 irela.r_addend = 1; /* tell rtld to set value to resolver function */
2598 bfd_elf32_swap_reloca_out (output_bfd, &irela, loc);
2600 BFD_ASSERT (rtld_reloc <= srelgot->reloc_count);
2602 /* Next literal immediately follows the first. */
2603 loc += sizeof (Elf32_External_Rela);
2604 bfd_elf32_swap_reloca_in (output_bfd, loc, &irela);
2605 BFD_ASSERT (ELF32_R_TYPE (irela.r_info) == R_XTENSA_RTLD);
2606 irela.r_offset = (sgotplt->output_section->vma
2607 + sgotplt->output_offset + 4);
2608 /* Tell rtld to set value to object's link map. */
2610 bfd_elf32_swap_reloca_out (output_bfd, &irela, loc);
2612 BFD_ASSERT (rtld_reloc <= srelgot->reloc_count);
2614 /* Fill in the literal table. */
2615 if (chunk < plt_chunks - 1)
2616 chunk_entries = PLT_ENTRIES_PER_CHUNK;
2618 chunk_entries = plt_entries - (chunk * PLT_ENTRIES_PER_CHUNK);
2620 BFD_ASSERT ((unsigned) (chunk + 1) * 8 <= spltlittbl->size);
2621 bfd_put_32 (output_bfd,
2622 sgotplt->output_section->vma + sgotplt->output_offset,
2623 spltlittbl->contents + (chunk * 8) + 0);
2624 bfd_put_32 (output_bfd,
2625 8 + (chunk_entries * 4),
2626 spltlittbl->contents + (chunk * 8) + 4);
2629 /* All the dynamic relocations have been emitted at this point.
2630 Make sure the relocation sections are the correct size. */
2631 if (srelgot->size != (sizeof (Elf32_External_Rela)
2632 * srelgot->reloc_count)
2633 || srelplt->size != (sizeof (Elf32_External_Rela)
2634 * srelplt->reloc_count))
2637 /* The .xt.lit.plt section has just been modified. This must
2638 happen before the code below which combines adjacent literal
2639 table entries, and the .xt.lit.plt contents have to be forced to
2641 if (! bfd_set_section_contents (output_bfd,
2642 spltlittbl->output_section,
2643 spltlittbl->contents,
2644 spltlittbl->output_offset,
2647 /* Clear SEC_HAS_CONTENTS so the contents won't be output again. */
2648 spltlittbl->flags &= ~SEC_HAS_CONTENTS;
2651 /* Combine adjacent literal table entries. */
2652 BFD_ASSERT (! info->relocatable);
2653 sxtlit = bfd_get_section_by_name (output_bfd, ".xt.lit");
2654 sgotloc = htab->sgotloc;
2655 BFD_ASSERT (sxtlit && sgotloc);
2657 elf_xtensa_combine_prop_entries (output_bfd, sxtlit, sgotloc);
2658 if (num_xtlit_entries < 0)
2661 dyncon = (Elf32_External_Dyn *) sdyn->contents;
2662 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
2663 for (; dyncon < dynconend; dyncon++)
2665 Elf_Internal_Dyn dyn;
2667 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
2674 case DT_XTENSA_GOT_LOC_SZ:
2675 dyn.d_un.d_val = num_xtlit_entries;
2678 case DT_XTENSA_GOT_LOC_OFF:
2679 dyn.d_un.d_ptr = htab->sgotloc->vma;
2683 dyn.d_un.d_ptr = htab->sgot->vma;
2687 dyn.d_un.d_ptr = htab->srelplt->vma;
2691 dyn.d_un.d_val = htab->srelplt->size;
2695 /* Adjust RELASZ to not include JMPREL. This matches what
2696 glibc expects and what is done for several other ELF
2697 targets (e.g., i386, alpha), but the "correct" behavior
2698 seems to be unresolved. Since the linker script arranges
2699 for .rela.plt to follow all other relocation sections, we
2700 don't have to worry about changing the DT_RELA entry. */
2702 dyn.d_un.d_val -= htab->srelplt->size;
2706 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2713 /* Functions for dealing with the e_flags field. */
2715 /* Merge backend specific data from an object file to the output
2716 object file when linking. */
2719 elf_xtensa_merge_private_bfd_data (bfd *ibfd, bfd *obfd)
2721 unsigned out_mach, in_mach;
2722 flagword out_flag, in_flag;
2724 /* Check if we have the same endianess. */
2725 if (!_bfd_generic_verify_endian_match (ibfd, obfd))
2728 /* Don't even pretend to support mixed-format linking. */
2729 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
2730 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
2733 out_flag = elf_elfheader (obfd)->e_flags;
2734 in_flag = elf_elfheader (ibfd)->e_flags;
2736 out_mach = out_flag & EF_XTENSA_MACH;
2737 in_mach = in_flag & EF_XTENSA_MACH;
2738 if (out_mach != in_mach)
2740 (*_bfd_error_handler)
2741 (_("%B: incompatible machine type. Output is 0x%x. Input is 0x%x"),
2742 ibfd, out_mach, in_mach);
2743 bfd_set_error (bfd_error_wrong_format);
2747 if (! elf_flags_init (obfd))
2749 elf_flags_init (obfd) = TRUE;
2750 elf_elfheader (obfd)->e_flags = in_flag;
2752 if (bfd_get_arch (obfd) == bfd_get_arch (ibfd)
2753 && bfd_get_arch_info (obfd)->the_default)
2754 return bfd_set_arch_mach (obfd, bfd_get_arch (ibfd),
2755 bfd_get_mach (ibfd));
2760 if ((out_flag & EF_XTENSA_XT_INSN) != (in_flag & EF_XTENSA_XT_INSN))
2761 elf_elfheader (obfd)->e_flags &= (~ EF_XTENSA_XT_INSN);
2763 if ((out_flag & EF_XTENSA_XT_LIT) != (in_flag & EF_XTENSA_XT_LIT))
2764 elf_elfheader (obfd)->e_flags &= (~ EF_XTENSA_XT_LIT);
2771 elf_xtensa_set_private_flags (bfd *abfd, flagword flags)
2773 BFD_ASSERT (!elf_flags_init (abfd)
2774 || elf_elfheader (abfd)->e_flags == flags);
2776 elf_elfheader (abfd)->e_flags |= flags;
2777 elf_flags_init (abfd) = TRUE;
2784 elf_xtensa_print_private_bfd_data (bfd *abfd, void *farg)
2786 FILE *f = (FILE *) farg;
2787 flagword e_flags = elf_elfheader (abfd)->e_flags;
2789 fprintf (f, "\nXtensa header:\n");
2790 if ((e_flags & EF_XTENSA_MACH) == E_XTENSA_MACH)
2791 fprintf (f, "\nMachine = Base\n");
2793 fprintf (f, "\nMachine Id = 0x%x\n", e_flags & EF_XTENSA_MACH);
2795 fprintf (f, "Insn tables = %s\n",
2796 (e_flags & EF_XTENSA_XT_INSN) ? "true" : "false");
2798 fprintf (f, "Literal tables = %s\n",
2799 (e_flags & EF_XTENSA_XT_LIT) ? "true" : "false");
2801 return _bfd_elf_print_private_bfd_data (abfd, farg);
2805 /* Set the right machine number for an Xtensa ELF file. */
2808 elf_xtensa_object_p (bfd *abfd)
2811 unsigned long arch = elf_elfheader (abfd)->e_flags & EF_XTENSA_MACH;
2816 mach = bfd_mach_xtensa;
2822 (void) bfd_default_set_arch_mach (abfd, bfd_arch_xtensa, mach);
2827 /* The final processing done just before writing out an Xtensa ELF object
2828 file. This gets the Xtensa architecture right based on the machine
2832 elf_xtensa_final_write_processing (bfd *abfd,
2833 bfd_boolean linker ATTRIBUTE_UNUSED)
2838 switch (mach = bfd_get_mach (abfd))
2840 case bfd_mach_xtensa:
2841 val = E_XTENSA_MACH;
2847 elf_elfheader (abfd)->e_flags &= (~ EF_XTENSA_MACH);
2848 elf_elfheader (abfd)->e_flags |= val;
2852 static enum elf_reloc_type_class
2853 elf_xtensa_reloc_type_class (const Elf_Internal_Rela *rela)
2855 switch ((int) ELF32_R_TYPE (rela->r_info))
2857 case R_XTENSA_RELATIVE:
2858 return reloc_class_relative;
2859 case R_XTENSA_JMP_SLOT:
2860 return reloc_class_plt;
2862 return reloc_class_normal;
2868 elf_xtensa_discard_info_for_section (bfd *abfd,
2869 struct elf_reloc_cookie *cookie,
2870 struct bfd_link_info *info,
2874 bfd_vma section_size;
2875 bfd_vma offset, actual_offset;
2876 size_t removed_bytes = 0;
2878 section_size = sec->size;
2879 if (section_size == 0 || section_size % 8 != 0)
2882 if (sec->output_section
2883 && bfd_is_abs_section (sec->output_section))
2886 contents = retrieve_contents (abfd, sec, info->keep_memory);
2890 cookie->rels = retrieve_internal_relocs (abfd, sec, info->keep_memory);
2893 release_contents (sec, contents);
2897 cookie->rel = cookie->rels;
2898 cookie->relend = cookie->rels + sec->reloc_count;
2900 for (offset = 0; offset < section_size; offset += 8)
2902 actual_offset = offset - removed_bytes;
2904 /* The ...symbol_deleted_p function will skip over relocs but it
2905 won't adjust their offsets, so do that here. */
2906 while (cookie->rel < cookie->relend
2907 && cookie->rel->r_offset < offset)
2909 cookie->rel->r_offset -= removed_bytes;
2913 while (cookie->rel < cookie->relend
2914 && cookie->rel->r_offset == offset)
2916 if (bfd_elf_reloc_symbol_deleted_p (offset, cookie))
2918 /* Remove the table entry. (If the reloc type is NONE, then
2919 the entry has already been merged with another and deleted
2920 during relaxation.) */
2921 if (ELF32_R_TYPE (cookie->rel->r_info) != R_XTENSA_NONE)
2923 /* Shift the contents up. */
2924 if (offset + 8 < section_size)
2925 memmove (&contents[actual_offset],
2926 &contents[actual_offset+8],
2927 section_size - offset - 8);
2931 /* Remove this relocation. */
2932 cookie->rel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
2935 /* Adjust the relocation offset for previous removals. This
2936 should not be done before calling ...symbol_deleted_p
2937 because it might mess up the offset comparisons there.
2938 Make sure the offset doesn't underflow in the case where
2939 the first entry is removed. */
2940 if (cookie->rel->r_offset >= removed_bytes)
2941 cookie->rel->r_offset -= removed_bytes;
2943 cookie->rel->r_offset = 0;
2949 if (removed_bytes != 0)
2951 /* Adjust any remaining relocs (shouldn't be any). */
2952 for (; cookie->rel < cookie->relend; cookie->rel++)
2954 if (cookie->rel->r_offset >= removed_bytes)
2955 cookie->rel->r_offset -= removed_bytes;
2957 cookie->rel->r_offset = 0;
2960 /* Clear the removed bytes. */
2961 memset (&contents[section_size - removed_bytes], 0, removed_bytes);
2963 pin_contents (sec, contents);
2964 pin_internal_relocs (sec, cookie->rels);
2967 sec->size = section_size - removed_bytes;
2969 if (xtensa_is_littable_section (sec))
2971 asection *sgotloc = elf_xtensa_hash_table (info)->sgotloc;
2973 sgotloc->size -= removed_bytes;
2978 release_contents (sec, contents);
2979 release_internal_relocs (sec, cookie->rels);
2982 return (removed_bytes != 0);
2987 elf_xtensa_discard_info (bfd *abfd,
2988 struct elf_reloc_cookie *cookie,
2989 struct bfd_link_info *info)
2992 bfd_boolean changed = FALSE;
2994 for (sec = abfd->sections; sec != NULL; sec = sec->next)
2996 if (xtensa_is_property_section (sec))
2998 if (elf_xtensa_discard_info_for_section (abfd, cookie, info, sec))
3008 elf_xtensa_ignore_discarded_relocs (asection *sec)
3010 return xtensa_is_property_section (sec);
3015 elf_xtensa_action_discarded (asection *sec)
3017 if (strcmp (".xt_except_table", sec->name) == 0)
3020 if (strcmp (".xt_except_desc", sec->name) == 0)
3023 return _bfd_elf_default_action_discarded (sec);
3027 /* Support for core dump NOTE sections. */
3030 elf_xtensa_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
3035 /* The size for Xtensa is variable, so don't try to recognize the format
3036 based on the size. Just assume this is GNU/Linux. */
3039 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12);
3042 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24);
3046 size = note->descsz - offset - 4;
3048 /* Make a ".reg/999" section. */
3049 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
3050 size, note->descpos + offset);
3055 elf_xtensa_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
3057 switch (note->descsz)
3062 case 128: /* GNU/Linux elf_prpsinfo */
3063 elf_tdata (abfd)->core_program
3064 = _bfd_elfcore_strndup (abfd, note->descdata + 32, 16);
3065 elf_tdata (abfd)->core_command
3066 = _bfd_elfcore_strndup (abfd, note->descdata + 48, 80);
3069 /* Note that for some reason, a spurious space is tacked
3070 onto the end of the args in some (at least one anyway)
3071 implementations, so strip it off if it exists. */
3074 char *command = elf_tdata (abfd)->core_command;
3075 int n = strlen (command);
3077 if (0 < n && command[n - 1] == ' ')
3078 command[n - 1] = '\0';
3085 /* Generic Xtensa configurability stuff. */
3087 static xtensa_opcode callx0_op = XTENSA_UNDEFINED;
3088 static xtensa_opcode callx4_op = XTENSA_UNDEFINED;
3089 static xtensa_opcode callx8_op = XTENSA_UNDEFINED;
3090 static xtensa_opcode callx12_op = XTENSA_UNDEFINED;
3091 static xtensa_opcode call0_op = XTENSA_UNDEFINED;
3092 static xtensa_opcode call4_op = XTENSA_UNDEFINED;
3093 static xtensa_opcode call8_op = XTENSA_UNDEFINED;
3094 static xtensa_opcode call12_op = XTENSA_UNDEFINED;
3097 init_call_opcodes (void)
3099 if (callx0_op == XTENSA_UNDEFINED)
3101 callx0_op = xtensa_opcode_lookup (xtensa_default_isa, "callx0");
3102 callx4_op = xtensa_opcode_lookup (xtensa_default_isa, "callx4");
3103 callx8_op = xtensa_opcode_lookup (xtensa_default_isa, "callx8");
3104 callx12_op = xtensa_opcode_lookup (xtensa_default_isa, "callx12");
3105 call0_op = xtensa_opcode_lookup (xtensa_default_isa, "call0");
3106 call4_op = xtensa_opcode_lookup (xtensa_default_isa, "call4");
3107 call8_op = xtensa_opcode_lookup (xtensa_default_isa, "call8");
3108 call12_op = xtensa_opcode_lookup (xtensa_default_isa, "call12");
3114 is_indirect_call_opcode (xtensa_opcode opcode)
3116 init_call_opcodes ();
3117 return (opcode == callx0_op
3118 || opcode == callx4_op
3119 || opcode == callx8_op
3120 || opcode == callx12_op);
3125 is_direct_call_opcode (xtensa_opcode opcode)
3127 init_call_opcodes ();
3128 return (opcode == call0_op
3129 || opcode == call4_op
3130 || opcode == call8_op
3131 || opcode == call12_op);
3136 is_windowed_call_opcode (xtensa_opcode opcode)
3138 init_call_opcodes ();
3139 return (opcode == call4_op
3140 || opcode == call8_op
3141 || opcode == call12_op
3142 || opcode == callx4_op
3143 || opcode == callx8_op
3144 || opcode == callx12_op);
3148 static xtensa_opcode
3149 get_const16_opcode (void)
3151 static bfd_boolean done_lookup = FALSE;
3152 static xtensa_opcode const16_opcode = XTENSA_UNDEFINED;
3155 const16_opcode = xtensa_opcode_lookup (xtensa_default_isa, "const16");
3158 return const16_opcode;
3162 static xtensa_opcode
3163 get_l32r_opcode (void)
3165 static xtensa_opcode l32r_opcode = XTENSA_UNDEFINED;
3166 static bfd_boolean done_lookup = FALSE;
3170 l32r_opcode = xtensa_opcode_lookup (xtensa_default_isa, "l32r");
3178 l32r_offset (bfd_vma addr, bfd_vma pc)
3182 offset = addr - ((pc+3) & -4);
3183 BFD_ASSERT ((offset & ((1 << 2) - 1)) == 0);
3184 offset = (signed int) offset >> 2;
3185 BFD_ASSERT ((signed int) offset >> 16 == -1);
3191 get_relocation_opnd (xtensa_opcode opcode, int r_type)
3193 xtensa_isa isa = xtensa_default_isa;
3194 int last_immed, last_opnd, opi;
3196 if (opcode == XTENSA_UNDEFINED)
3197 return XTENSA_UNDEFINED;
3199 /* Find the last visible PC-relative immediate operand for the opcode.
3200 If there are no PC-relative immediates, then choose the last visible
3201 immediate; otherwise, fail and return XTENSA_UNDEFINED. */
3202 last_immed = XTENSA_UNDEFINED;
3203 last_opnd = xtensa_opcode_num_operands (isa, opcode);
3204 for (opi = last_opnd - 1; opi >= 0; opi--)
3206 if (xtensa_operand_is_visible (isa, opcode, opi) == 0)
3208 if (xtensa_operand_is_PCrelative (isa, opcode, opi) == 1)
3213 if (last_immed == XTENSA_UNDEFINED
3214 && xtensa_operand_is_register (isa, opcode, opi) == 0)
3218 return XTENSA_UNDEFINED;
3220 /* If the operand number was specified in an old-style relocation,
3221 check for consistency with the operand computed above. */
3222 if (r_type >= R_XTENSA_OP0 && r_type <= R_XTENSA_OP2)
3224 int reloc_opnd = r_type - R_XTENSA_OP0;
3225 if (reloc_opnd != last_immed)
3226 return XTENSA_UNDEFINED;
3234 get_relocation_slot (int r_type)
3244 if (r_type >= R_XTENSA_SLOT0_OP && r_type <= R_XTENSA_SLOT14_OP)
3245 return r_type - R_XTENSA_SLOT0_OP;
3246 if (r_type >= R_XTENSA_SLOT0_ALT && r_type <= R_XTENSA_SLOT14_ALT)
3247 return r_type - R_XTENSA_SLOT0_ALT;
3251 return XTENSA_UNDEFINED;
3255 /* Get the opcode for a relocation. */
3257 static xtensa_opcode
3258 get_relocation_opcode (bfd *abfd,
3261 Elf_Internal_Rela *irel)
3263 static xtensa_insnbuf ibuff = NULL;
3264 static xtensa_insnbuf sbuff = NULL;
3265 xtensa_isa isa = xtensa_default_isa;
3269 if (contents == NULL)
3270 return XTENSA_UNDEFINED;
3272 if (bfd_get_section_limit (abfd, sec) <= irel->r_offset)
3273 return XTENSA_UNDEFINED;
3277 ibuff = xtensa_insnbuf_alloc (isa);
3278 sbuff = xtensa_insnbuf_alloc (isa);
3281 /* Decode the instruction. */
3282 xtensa_insnbuf_from_chars (isa, ibuff, &contents[irel->r_offset],
3283 sec->size - irel->r_offset);
3284 fmt = xtensa_format_decode (isa, ibuff);
3285 slot = get_relocation_slot (ELF32_R_TYPE (irel->r_info));
3286 if (slot == XTENSA_UNDEFINED)
3287 return XTENSA_UNDEFINED;
3288 xtensa_format_get_slot (isa, fmt, slot, ibuff, sbuff);
3289 return xtensa_opcode_decode (isa, fmt, slot, sbuff);
3294 is_l32r_relocation (bfd *abfd,
3297 Elf_Internal_Rela *irel)
3299 xtensa_opcode opcode;
3300 if (!is_operand_relocation (ELF32_R_TYPE (irel->r_info)))
3302 opcode = get_relocation_opcode (abfd, sec, contents, irel);
3303 return (opcode == get_l32r_opcode ());
3307 static bfd_size_type
3308 get_asm_simplify_size (bfd_byte *contents,
3309 bfd_size_type content_len,
3310 bfd_size_type offset)
3312 bfd_size_type insnlen, size = 0;
3314 /* Decode the size of the next two instructions. */
3315 insnlen = insn_decode_len (contents, content_len, offset);
3321 insnlen = insn_decode_len (contents, content_len, offset + size);
3331 is_alt_relocation (int r_type)
3333 return (r_type >= R_XTENSA_SLOT0_ALT
3334 && r_type <= R_XTENSA_SLOT14_ALT);
3339 is_operand_relocation (int r_type)
3349 if (r_type >= R_XTENSA_SLOT0_OP && r_type <= R_XTENSA_SLOT14_OP)
3351 if (r_type >= R_XTENSA_SLOT0_ALT && r_type <= R_XTENSA_SLOT14_ALT)
3360 #define MIN_INSN_LENGTH 2
3362 /* Return 0 if it fails to decode. */
3365 insn_decode_len (bfd_byte *contents,
3366 bfd_size_type content_len,
3367 bfd_size_type offset)
3370 xtensa_isa isa = xtensa_default_isa;
3372 static xtensa_insnbuf ibuff = NULL;
3374 if (offset + MIN_INSN_LENGTH > content_len)
3378 ibuff = xtensa_insnbuf_alloc (isa);
3379 xtensa_insnbuf_from_chars (isa, ibuff, &contents[offset],
3380 content_len - offset);
3381 fmt = xtensa_format_decode (isa, ibuff);
3382 if (fmt == XTENSA_UNDEFINED)
3384 insn_len = xtensa_format_length (isa, fmt);
3385 if (insn_len == XTENSA_UNDEFINED)
3391 /* Decode the opcode for a single slot instruction.
3392 Return 0 if it fails to decode or the instruction is multi-slot. */
3395 insn_decode_opcode (bfd_byte *contents,
3396 bfd_size_type content_len,
3397 bfd_size_type offset,
3400 xtensa_isa isa = xtensa_default_isa;
3402 static xtensa_insnbuf insnbuf = NULL;
3403 static xtensa_insnbuf slotbuf = NULL;
3405 if (offset + MIN_INSN_LENGTH > content_len)
3406 return XTENSA_UNDEFINED;
3408 if (insnbuf == NULL)
3410 insnbuf = xtensa_insnbuf_alloc (isa);
3411 slotbuf = xtensa_insnbuf_alloc (isa);
3414 xtensa_insnbuf_from_chars (isa, insnbuf, &contents[offset],
3415 content_len - offset);
3416 fmt = xtensa_format_decode (isa, insnbuf);
3417 if (fmt == XTENSA_UNDEFINED)
3418 return XTENSA_UNDEFINED;
3420 if (slot >= xtensa_format_num_slots (isa, fmt))
3421 return XTENSA_UNDEFINED;
3423 xtensa_format_get_slot (isa, fmt, slot, insnbuf, slotbuf);
3424 return xtensa_opcode_decode (isa, fmt, slot, slotbuf);
3428 /* The offset is the offset in the contents.
3429 The address is the address of that offset. */
3432 check_branch_target_aligned (bfd_byte *contents,
3433 bfd_size_type content_length,
3437 bfd_size_type insn_len = insn_decode_len (contents, content_length, offset);
3440 return check_branch_target_aligned_address (address, insn_len);
3445 check_loop_aligned (bfd_byte *contents,
3446 bfd_size_type content_length,
3450 bfd_size_type loop_len, insn_len;
3451 xtensa_opcode opcode;
3453 opcode = insn_decode_opcode (contents, content_length, offset, 0);
3454 if (opcode == XTENSA_UNDEFINED
3455 || xtensa_opcode_is_loop (xtensa_default_isa, opcode) != 1)
3461 loop_len = insn_decode_len (contents, content_length, offset);
3462 insn_len = insn_decode_len (contents, content_length, offset + loop_len);
3463 if (loop_len == 0 || insn_len == 0)
3469 return check_branch_target_aligned_address (address + loop_len, insn_len);
3474 check_branch_target_aligned_address (bfd_vma addr, int len)
3477 return (addr % 8 == 0);
3478 return ((addr >> 2) == ((addr + len - 1) >> 2));
3482 /* Instruction widening and narrowing. */
3484 /* When FLIX is available we need to access certain instructions only
3485 when they are 16-bit or 24-bit instructions. This table caches
3486 information about such instructions by walking through all the
3487 opcodes and finding the smallest single-slot format into which each
3490 static xtensa_format *op_single_fmt_table = NULL;
3494 init_op_single_format_table (void)
3496 xtensa_isa isa = xtensa_default_isa;
3497 xtensa_insnbuf ibuf;
3498 xtensa_opcode opcode;
3502 if (op_single_fmt_table)
3505 ibuf = xtensa_insnbuf_alloc (isa);
3506 num_opcodes = xtensa_isa_num_opcodes (isa);
3508 op_single_fmt_table = (xtensa_format *)
3509 bfd_malloc (sizeof (xtensa_format) * num_opcodes);
3510 for (opcode = 0; opcode < num_opcodes; opcode++)
3512 op_single_fmt_table[opcode] = XTENSA_UNDEFINED;
3513 for (fmt = 0; fmt < xtensa_isa_num_formats (isa); fmt++)
3515 if (xtensa_format_num_slots (isa, fmt) == 1
3516 && xtensa_opcode_encode (isa, fmt, 0, ibuf, opcode) == 0)
3518 xtensa_opcode old_fmt = op_single_fmt_table[opcode];
3519 int fmt_length = xtensa_format_length (isa, fmt);
3520 if (old_fmt == XTENSA_UNDEFINED
3521 || fmt_length < xtensa_format_length (isa, old_fmt))
3522 op_single_fmt_table[opcode] = fmt;
3526 xtensa_insnbuf_free (isa, ibuf);
3530 static xtensa_format
3531 get_single_format (xtensa_opcode opcode)
3533 init_op_single_format_table ();
3534 return op_single_fmt_table[opcode];
3538 /* For the set of narrowable instructions we do NOT include the
3539 narrowings beqz -> beqz.n or bnez -> bnez.n because of complexities
3540 involved during linker relaxation that may require these to
3541 re-expand in some conditions. Also, the narrowing "or" -> mov.n
3542 requires special case code to ensure it only works when op1 == op2. */
3550 struct string_pair narrowable[] =
3553 { "addi", "addi.n" },
3554 { "addmi", "addi.n" },
3555 { "l32i", "l32i.n" },
3556 { "movi", "movi.n" },
3558 { "retw", "retw.n" },
3559 { "s32i", "s32i.n" },
3560 { "or", "mov.n" } /* special case only when op1 == op2 */
3563 struct string_pair widenable[] =
3566 { "addi", "addi.n" },
3567 { "addmi", "addi.n" },
3568 { "beqz", "beqz.n" },
3569 { "bnez", "bnez.n" },
3570 { "l32i", "l32i.n" },
3571 { "movi", "movi.n" },
3573 { "retw", "retw.n" },
3574 { "s32i", "s32i.n" },
3575 { "or", "mov.n" } /* special case only when op1 == op2 */
3579 /* Check if an instruction can be "narrowed", i.e., changed from a standard
3580 3-byte instruction to a 2-byte "density" instruction. If it is valid,
3581 return the instruction buffer holding the narrow instruction. Otherwise,
3582 return 0. The set of valid narrowing are specified by a string table
3583 but require some special case operand checks in some cases. */
3585 static xtensa_insnbuf
3586 can_narrow_instruction (xtensa_insnbuf slotbuf,
3588 xtensa_opcode opcode)
3590 xtensa_isa isa = xtensa_default_isa;
3591 xtensa_format o_fmt;
3594 static xtensa_insnbuf o_insnbuf = NULL;
3595 static xtensa_insnbuf o_slotbuf = NULL;
3597 if (o_insnbuf == NULL)
3599 o_insnbuf = xtensa_insnbuf_alloc (isa);
3600 o_slotbuf = xtensa_insnbuf_alloc (isa);
3603 for (opi = 0; opi < (sizeof (narrowable)/sizeof (struct string_pair)); opi++)
3605 bfd_boolean is_or = (strcmp ("or", narrowable[opi].wide) == 0);
3607 if (opcode == xtensa_opcode_lookup (isa, narrowable[opi].wide))
3609 uint32 value, newval;
3610 int i, operand_count, o_operand_count;
3611 xtensa_opcode o_opcode;
3613 /* Address does not matter in this case. We might need to
3614 fix it to handle branches/jumps. */
3615 bfd_vma self_address = 0;
3617 o_opcode = xtensa_opcode_lookup (isa, narrowable[opi].narrow);
3618 if (o_opcode == XTENSA_UNDEFINED)
3620 o_fmt = get_single_format (o_opcode);
3621 if (o_fmt == XTENSA_UNDEFINED)
3624 if (xtensa_format_length (isa, fmt) != 3
3625 || xtensa_format_length (isa, o_fmt) != 2)
3628 xtensa_format_encode (isa, o_fmt, o_insnbuf);
3629 operand_count = xtensa_opcode_num_operands (isa, opcode);
3630 o_operand_count = xtensa_opcode_num_operands (isa, o_opcode);
3632 if (xtensa_opcode_encode (isa, o_fmt, 0, o_slotbuf, o_opcode) != 0)
3637 if (xtensa_opcode_num_operands (isa, o_opcode) != operand_count)
3642 uint32 rawval0, rawval1, rawval2;
3644 if (o_operand_count + 1 != operand_count
3645 || xtensa_operand_get_field (isa, opcode, 0,
3646 fmt, 0, slotbuf, &rawval0) != 0
3647 || xtensa_operand_get_field (isa, opcode, 1,
3648 fmt, 0, slotbuf, &rawval1) != 0
3649 || xtensa_operand_get_field (isa, opcode, 2,
3650 fmt, 0, slotbuf, &rawval2) != 0
3651 || rawval1 != rawval2
3652 || rawval0 == rawval1 /* it is a nop */)
3656 for (i = 0; i < o_operand_count; ++i)
3658 if (xtensa_operand_get_field (isa, opcode, i, fmt, 0,
3660 || xtensa_operand_decode (isa, opcode, i, &value))
3663 /* PC-relative branches need adjustment, but
3664 the PC-rel operand will always have a relocation. */
3666 if (xtensa_operand_do_reloc (isa, o_opcode, i, &newval,
3668 || xtensa_operand_encode (isa, o_opcode, i, &newval)
3669 || xtensa_operand_set_field (isa, o_opcode, i, o_fmt, 0,
3674 if (xtensa_format_set_slot (isa, o_fmt, 0, o_insnbuf, o_slotbuf))
3684 /* Attempt to narrow an instruction. If the narrowing is valid, perform
3685 the action in-place directly into the contents and return TRUE. Otherwise,
3686 the return value is FALSE and the contents are not modified. */
3689 narrow_instruction (bfd_byte *contents,
3690 bfd_size_type content_length,
3691 bfd_size_type offset)
3693 xtensa_opcode opcode;
3694 bfd_size_type insn_len;
3695 xtensa_isa isa = xtensa_default_isa;
3697 xtensa_insnbuf o_insnbuf;
3699 static xtensa_insnbuf insnbuf = NULL;
3700 static xtensa_insnbuf slotbuf = NULL;
3702 if (insnbuf == NULL)
3704 insnbuf = xtensa_insnbuf_alloc (isa);
3705 slotbuf = xtensa_insnbuf_alloc (isa);
3708 BFD_ASSERT (offset < content_length);
3710 if (content_length < 2)
3713 /* We will hand-code a few of these for a little while.
3714 These have all been specified in the assembler aleady. */
3715 xtensa_insnbuf_from_chars (isa, insnbuf, &contents[offset],
3716 content_length - offset);
3717 fmt = xtensa_format_decode (isa, insnbuf);
3718 if (xtensa_format_num_slots (isa, fmt) != 1)
3721 if (xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf) != 0)
3724 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
3725 if (opcode == XTENSA_UNDEFINED)
3727 insn_len = xtensa_format_length (isa, fmt);
3728 if (insn_len > content_length)
3731 o_insnbuf = can_narrow_instruction (slotbuf, fmt, opcode);
3734 xtensa_insnbuf_to_chars (isa, o_insnbuf, contents + offset,
3735 content_length - offset);
3743 /* Check if an instruction can be "widened", i.e., changed from a 2-byte
3744 "density" instruction to a standard 3-byte instruction. If it is valid,
3745 return the instruction buffer holding the wide instruction. Otherwise,
3746 return 0. The set of valid widenings are specified by a string table
3747 but require some special case operand checks in some cases. */
3749 static xtensa_insnbuf
3750 can_widen_instruction (xtensa_insnbuf slotbuf,
3752 xtensa_opcode opcode)
3754 xtensa_isa isa = xtensa_default_isa;
3755 xtensa_format o_fmt;
3758 static xtensa_insnbuf o_insnbuf = NULL;
3759 static xtensa_insnbuf o_slotbuf = NULL;
3761 if (o_insnbuf == NULL)
3763 o_insnbuf = xtensa_insnbuf_alloc (isa);
3764 o_slotbuf = xtensa_insnbuf_alloc (isa);
3767 for (opi = 0; opi < (sizeof (widenable)/sizeof (struct string_pair)); opi++)
3769 bfd_boolean is_or = (strcmp ("or", widenable[opi].wide) == 0);
3770 bfd_boolean is_branch = (strcmp ("beqz", widenable[opi].wide) == 0
3771 || strcmp ("bnez", widenable[opi].wide) == 0);
3773 if (opcode == xtensa_opcode_lookup (isa, widenable[opi].narrow))
3775 uint32 value, newval;
3776 int i, operand_count, o_operand_count, check_operand_count;
3777 xtensa_opcode o_opcode;
3779 /* Address does not matter in this case. We might need to fix it
3780 to handle branches/jumps. */
3781 bfd_vma self_address = 0;
3783 o_opcode = xtensa_opcode_lookup (isa, widenable[opi].wide);
3784 if (o_opcode == XTENSA_UNDEFINED)
3786 o_fmt = get_single_format (o_opcode);
3787 if (o_fmt == XTENSA_UNDEFINED)
3790 if (xtensa_format_length (isa, fmt) != 2
3791 || xtensa_format_length (isa, o_fmt) != 3)
3794 xtensa_format_encode (isa, o_fmt, o_insnbuf);
3795 operand_count = xtensa_opcode_num_operands (isa, opcode);
3796 o_operand_count = xtensa_opcode_num_operands (isa, o_opcode);
3797 check_operand_count = o_operand_count;
3799 if (xtensa_opcode_encode (isa, o_fmt, 0, o_slotbuf, o_opcode) != 0)
3804 if (xtensa_opcode_num_operands (isa, o_opcode) != operand_count)
3809 uint32 rawval0, rawval1;
3811 if (o_operand_count != operand_count + 1
3812 || xtensa_operand_get_field (isa, opcode, 0,
3813 fmt, 0, slotbuf, &rawval0) != 0
3814 || xtensa_operand_get_field (isa, opcode, 1,
3815 fmt, 0, slotbuf, &rawval1) != 0
3816 || rawval0 == rawval1 /* it is a nop */)
3820 check_operand_count--;
3822 for (i = 0; i < check_operand_count; i++)
3825 if (is_or && i == o_operand_count - 1)
3827 if (xtensa_operand_get_field (isa, opcode, new_i, fmt, 0,
3829 || xtensa_operand_decode (isa, opcode, new_i, &value))
3832 /* PC-relative branches need adjustment, but
3833 the PC-rel operand will always have a relocation. */
3835 if (xtensa_operand_do_reloc (isa, o_opcode, i, &newval,
3837 || xtensa_operand_encode (isa, o_opcode, i, &newval)
3838 || xtensa_operand_set_field (isa, o_opcode, i, o_fmt, 0,
3843 if (xtensa_format_set_slot (isa, o_fmt, 0, o_insnbuf, o_slotbuf))
3853 /* Attempt to widen an instruction. If the widening is valid, perform
3854 the action in-place directly into the contents and return TRUE. Otherwise,
3855 the return value is FALSE and the contents are not modified. */
3858 widen_instruction (bfd_byte *contents,
3859 bfd_size_type content_length,
3860 bfd_size_type offset)
3862 xtensa_opcode opcode;
3863 bfd_size_type insn_len;
3864 xtensa_isa isa = xtensa_default_isa;
3866 xtensa_insnbuf o_insnbuf;
3868 static xtensa_insnbuf insnbuf = NULL;
3869 static xtensa_insnbuf slotbuf = NULL;
3871 if (insnbuf == NULL)
3873 insnbuf = xtensa_insnbuf_alloc (isa);
3874 slotbuf = xtensa_insnbuf_alloc (isa);
3877 BFD_ASSERT (offset < content_length);
3879 if (content_length < 2)
3882 /* We will hand-code a few of these for a little while.
3883 These have all been specified in the assembler aleady. */
3884 xtensa_insnbuf_from_chars (isa, insnbuf, &contents[offset],
3885 content_length - offset);
3886 fmt = xtensa_format_decode (isa, insnbuf);
3887 if (xtensa_format_num_slots (isa, fmt) != 1)
3890 if (xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf) != 0)
3893 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
3894 if (opcode == XTENSA_UNDEFINED)
3896 insn_len = xtensa_format_length (isa, fmt);
3897 if (insn_len > content_length)
3900 o_insnbuf = can_widen_instruction (slotbuf, fmt, opcode);
3903 xtensa_insnbuf_to_chars (isa, o_insnbuf, contents + offset,
3904 content_length - offset);
3911 /* Code for transforming CALLs at link-time. */
3913 static bfd_reloc_status_type
3914 elf_xtensa_do_asm_simplify (bfd_byte *contents,
3916 bfd_vma content_length,
3917 char **error_message)
3919 static xtensa_insnbuf insnbuf = NULL;
3920 static xtensa_insnbuf slotbuf = NULL;
3921 xtensa_format core_format = XTENSA_UNDEFINED;
3922 xtensa_opcode opcode;
3923 xtensa_opcode direct_call_opcode;
3924 xtensa_isa isa = xtensa_default_isa;
3925 bfd_byte *chbuf = contents + address;
3928 if (insnbuf == NULL)
3930 insnbuf = xtensa_insnbuf_alloc (isa);
3931 slotbuf = xtensa_insnbuf_alloc (isa);
3934 if (content_length < address)
3936 *error_message = _("Attempt to convert L32R/CALLX to CALL failed");
3937 return bfd_reloc_other;
3940 opcode = get_expanded_call_opcode (chbuf, content_length - address, 0);
3941 direct_call_opcode = swap_callx_for_call_opcode (opcode);
3942 if (direct_call_opcode == XTENSA_UNDEFINED)
3944 *error_message = _("Attempt to convert L32R/CALLX to CALL failed");
3945 return bfd_reloc_other;
3948 /* Assemble a NOP ("or a1, a1, a1") into the 0 byte offset. */
3949 core_format = xtensa_format_lookup (isa, "x24");
3950 opcode = xtensa_opcode_lookup (isa, "or");
3951 xtensa_opcode_encode (isa, core_format, 0, slotbuf, opcode);
3952 for (opn = 0; opn < 3; opn++)
3955 xtensa_operand_encode (isa, opcode, opn, ®no);
3956 xtensa_operand_set_field (isa, opcode, opn, core_format, 0,
3959 xtensa_format_encode (isa, core_format, insnbuf);
3960 xtensa_format_set_slot (isa, core_format, 0, insnbuf, slotbuf);
3961 xtensa_insnbuf_to_chars (isa, insnbuf, chbuf, content_length - address);
3963 /* Assemble a CALL ("callN 0") into the 3 byte offset. */
3964 xtensa_opcode_encode (isa, core_format, 0, slotbuf, direct_call_opcode);
3965 xtensa_operand_set_field (isa, opcode, 0, core_format, 0, slotbuf, 0);
3967 xtensa_format_encode (isa, core_format, insnbuf);
3968 xtensa_format_set_slot (isa, core_format, 0, insnbuf, slotbuf);
3969 xtensa_insnbuf_to_chars (isa, insnbuf, chbuf + 3,
3970 content_length - address - 3);
3972 return bfd_reloc_ok;
3976 static bfd_reloc_status_type
3977 contract_asm_expansion (bfd_byte *contents,
3978 bfd_vma content_length,
3979 Elf_Internal_Rela *irel,
3980 char **error_message)
3982 bfd_reloc_status_type retval =
3983 elf_xtensa_do_asm_simplify (contents, irel->r_offset, content_length,
3986 if (retval != bfd_reloc_ok)
3987 return bfd_reloc_dangerous;
3989 /* Update the irel->r_offset field so that the right immediate and
3990 the right instruction are modified during the relocation. */
3991 irel->r_offset += 3;
3992 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), R_XTENSA_SLOT0_OP);
3993 return bfd_reloc_ok;
3997 static xtensa_opcode
3998 swap_callx_for_call_opcode (xtensa_opcode opcode)
4000 init_call_opcodes ();
4002 if (opcode == callx0_op) return call0_op;
4003 if (opcode == callx4_op) return call4_op;
4004 if (opcode == callx8_op) return call8_op;
4005 if (opcode == callx12_op) return call12_op;
4007 /* Return XTENSA_UNDEFINED if the opcode is not an indirect call. */
4008 return XTENSA_UNDEFINED;
4012 /* Check if "buf" is pointing to a "L32R aN; CALLX aN" or "CONST16 aN;
4013 CONST16 aN; CALLX aN" sequence, and if so, return the CALLX opcode.
4014 If not, return XTENSA_UNDEFINED. */
4016 #define L32R_TARGET_REG_OPERAND 0
4017 #define CONST16_TARGET_REG_OPERAND 0
4018 #define CALLN_SOURCE_OPERAND 0
4020 static xtensa_opcode
4021 get_expanded_call_opcode (bfd_byte *buf, int bufsize, bfd_boolean *p_uses_l32r)
4023 static xtensa_insnbuf insnbuf = NULL;
4024 static xtensa_insnbuf slotbuf = NULL;
4026 xtensa_opcode opcode;
4027 xtensa_isa isa = xtensa_default_isa;
4028 uint32 regno, const16_regno, call_regno;
4031 if (insnbuf == NULL)
4033 insnbuf = xtensa_insnbuf_alloc (isa);
4034 slotbuf = xtensa_insnbuf_alloc (isa);
4037 xtensa_insnbuf_from_chars (isa, insnbuf, buf, bufsize);
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;
4043 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
4044 if (opcode == XTENSA_UNDEFINED)
4045 return XTENSA_UNDEFINED;
4047 if (opcode == get_l32r_opcode ())
4050 *p_uses_l32r = TRUE;
4051 if (xtensa_operand_get_field (isa, opcode, L32R_TARGET_REG_OPERAND,
4052 fmt, 0, slotbuf, ®no)
4053 || xtensa_operand_decode (isa, opcode, L32R_TARGET_REG_OPERAND,
4055 return XTENSA_UNDEFINED;
4057 else if (opcode == get_const16_opcode ())
4060 *p_uses_l32r = FALSE;
4061 if (xtensa_operand_get_field (isa, opcode, CONST16_TARGET_REG_OPERAND,
4062 fmt, 0, slotbuf, ®no)
4063 || xtensa_operand_decode (isa, opcode, CONST16_TARGET_REG_OPERAND,
4065 return XTENSA_UNDEFINED;
4067 /* Check that the next instruction is also CONST16. */
4068 offset += xtensa_format_length (isa, fmt);
4069 xtensa_insnbuf_from_chars (isa, insnbuf, buf + offset, bufsize - offset);
4070 fmt = xtensa_format_decode (isa, insnbuf);
4071 if (fmt == XTENSA_UNDEFINED
4072 || xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf))
4073 return XTENSA_UNDEFINED;
4074 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
4075 if (opcode != get_const16_opcode ())
4076 return XTENSA_UNDEFINED;
4078 if (xtensa_operand_get_field (isa, opcode, CONST16_TARGET_REG_OPERAND,
4079 fmt, 0, slotbuf, &const16_regno)
4080 || xtensa_operand_decode (isa, opcode, CONST16_TARGET_REG_OPERAND,
4082 || const16_regno != regno)
4083 return XTENSA_UNDEFINED;
4086 return XTENSA_UNDEFINED;
4088 /* Next instruction should be an CALLXn with operand 0 == regno. */
4089 offset += xtensa_format_length (isa, fmt);
4090 xtensa_insnbuf_from_chars (isa, insnbuf, buf + offset, bufsize - offset);
4091 fmt = xtensa_format_decode (isa, insnbuf);
4092 if (fmt == XTENSA_UNDEFINED
4093 || xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf))
4094 return XTENSA_UNDEFINED;
4095 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
4096 if (opcode == XTENSA_UNDEFINED
4097 || !is_indirect_call_opcode (opcode))
4098 return XTENSA_UNDEFINED;
4100 if (xtensa_operand_get_field (isa, opcode, CALLN_SOURCE_OPERAND,
4101 fmt, 0, slotbuf, &call_regno)
4102 || xtensa_operand_decode (isa, opcode, CALLN_SOURCE_OPERAND,
4104 return XTENSA_UNDEFINED;
4106 if (call_regno != regno)
4107 return XTENSA_UNDEFINED;
4113 /* Data structures used during relaxation. */
4115 /* r_reloc: relocation values. */
4117 /* Through the relaxation process, we need to keep track of the values
4118 that will result from evaluating relocations. The standard ELF
4119 relocation structure is not sufficient for this purpose because we're
4120 operating on multiple input files at once, so we need to know which
4121 input file a relocation refers to. The r_reloc structure thus
4122 records both the input file (bfd) and ELF relocation.
4124 For efficiency, an r_reloc also contains a "target_offset" field to
4125 cache the target-section-relative offset value that is represented by
4128 The r_reloc also contains a virtual offset that allows multiple
4129 inserted literals to be placed at the same "address" with
4130 different offsets. */
4132 typedef struct r_reloc_struct r_reloc;
4134 struct r_reloc_struct
4137 Elf_Internal_Rela rela;
4138 bfd_vma target_offset;
4139 bfd_vma virtual_offset;
4143 /* The r_reloc structure is included by value in literal_value, but not
4144 every literal_value has an associated relocation -- some are simple
4145 constants. In such cases, we set all the fields in the r_reloc
4146 struct to zero. The r_reloc_is_const function should be used to
4147 detect this case. */
4150 r_reloc_is_const (const r_reloc *r_rel)
4152 return (r_rel->abfd == NULL);
4157 r_reloc_get_target_offset (const r_reloc *r_rel)
4159 bfd_vma target_offset;
4160 unsigned long r_symndx;
4162 BFD_ASSERT (!r_reloc_is_const (r_rel));
4163 r_symndx = ELF32_R_SYM (r_rel->rela.r_info);
4164 target_offset = get_elf_r_symndx_offset (r_rel->abfd, r_symndx);
4165 return (target_offset + r_rel->rela.r_addend);
4169 static struct elf_link_hash_entry *
4170 r_reloc_get_hash_entry (const r_reloc *r_rel)
4172 unsigned long r_symndx = ELF32_R_SYM (r_rel->rela.r_info);
4173 return get_elf_r_symndx_hash_entry (r_rel->abfd, r_symndx);
4178 r_reloc_get_section (const r_reloc *r_rel)
4180 unsigned long r_symndx = ELF32_R_SYM (r_rel->rela.r_info);
4181 return get_elf_r_symndx_section (r_rel->abfd, r_symndx);
4186 r_reloc_is_defined (const r_reloc *r_rel)
4192 sec = r_reloc_get_section (r_rel);
4193 if (sec == bfd_abs_section_ptr
4194 || sec == bfd_com_section_ptr
4195 || sec == bfd_und_section_ptr)
4202 r_reloc_init (r_reloc *r_rel,
4204 Elf_Internal_Rela *irel,
4206 bfd_size_type content_length)
4209 reloc_howto_type *howto;
4213 r_rel->rela = *irel;
4215 r_rel->target_offset = r_reloc_get_target_offset (r_rel);
4216 r_rel->virtual_offset = 0;
4217 r_type = ELF32_R_TYPE (r_rel->rela.r_info);
4218 howto = &elf_howto_table[r_type];
4219 if (howto->partial_inplace)
4221 bfd_vma inplace_val;
4222 BFD_ASSERT (r_rel->rela.r_offset < content_length);
4224 inplace_val = bfd_get_32 (abfd, &contents[r_rel->rela.r_offset]);
4225 r_rel->target_offset += inplace_val;
4229 memset (r_rel, 0, sizeof (r_reloc));
4236 print_r_reloc (FILE *fp, const r_reloc *r_rel)
4238 if (r_reloc_is_defined (r_rel))
4240 asection *sec = r_reloc_get_section (r_rel);
4241 fprintf (fp, " %s(%s + ", sec->owner->filename, sec->name);
4243 else if (r_reloc_get_hash_entry (r_rel))
4244 fprintf (fp, " %s + ", r_reloc_get_hash_entry (r_rel)->root.root.string);
4246 fprintf (fp, " ?? + ");
4248 fprintf_vma (fp, r_rel->target_offset);
4249 if (r_rel->virtual_offset)
4251 fprintf (fp, " + ");
4252 fprintf_vma (fp, r_rel->virtual_offset);
4261 /* source_reloc: relocations that reference literals. */
4263 /* To determine whether literals can be coalesced, we need to first
4264 record all the relocations that reference the literals. The
4265 source_reloc structure below is used for this purpose. The
4266 source_reloc entries are kept in a per-literal-section array, sorted
4267 by offset within the literal section (i.e., target offset).
4269 The source_sec and r_rel.rela.r_offset fields identify the source of
4270 the relocation. The r_rel field records the relocation value, i.e.,
4271 the offset of the literal being referenced. The opnd field is needed
4272 to determine the range of the immediate field to which the relocation
4273 applies, so we can determine whether another literal with the same
4274 value is within range. The is_null field is true when the relocation
4275 is being removed (e.g., when an L32R is being removed due to a CALLX
4276 that is converted to a direct CALL). */
4278 typedef struct source_reloc_struct source_reloc;
4280 struct source_reloc_struct
4282 asection *source_sec;
4284 xtensa_opcode opcode;
4286 bfd_boolean is_null;
4287 bfd_boolean is_abs_literal;
4292 init_source_reloc (source_reloc *reloc,
4293 asection *source_sec,
4294 const r_reloc *r_rel,
4295 xtensa_opcode opcode,
4297 bfd_boolean is_abs_literal)
4299 reloc->source_sec = source_sec;
4300 reloc->r_rel = *r_rel;
4301 reloc->opcode = opcode;
4303 reloc->is_null = FALSE;
4304 reloc->is_abs_literal = is_abs_literal;
4308 /* Find the source_reloc for a particular source offset and relocation
4309 type. Note that the array is sorted by _target_ offset, so this is
4310 just a linear search. */
4312 static source_reloc *
4313 find_source_reloc (source_reloc *src_relocs,
4316 Elf_Internal_Rela *irel)
4320 for (i = 0; i < src_count; i++)
4322 if (src_relocs[i].source_sec == sec
4323 && src_relocs[i].r_rel.rela.r_offset == irel->r_offset
4324 && (ELF32_R_TYPE (src_relocs[i].r_rel.rela.r_info)
4325 == ELF32_R_TYPE (irel->r_info)))
4326 return &src_relocs[i];
4334 source_reloc_compare (const void *ap, const void *bp)
4336 const source_reloc *a = (const source_reloc *) ap;
4337 const source_reloc *b = (const source_reloc *) bp;
4339 if (a->r_rel.target_offset != b->r_rel.target_offset)
4340 return (a->r_rel.target_offset - b->r_rel.target_offset);
4342 /* We don't need to sort on these criteria for correctness,
4343 but enforcing a more strict ordering prevents unstable qsort
4344 from behaving differently with different implementations.
4345 Without the code below we get correct but different results
4346 on Solaris 2.7 and 2.8. We would like to always produce the
4347 same results no matter the host. */
4349 if ((!a->is_null) - (!b->is_null))
4350 return ((!a->is_null) - (!b->is_null));
4351 return internal_reloc_compare (&a->r_rel.rela, &b->r_rel.rela);
4355 /* Literal values and value hash tables. */
4357 /* Literals with the same value can be coalesced. The literal_value
4358 structure records the value of a literal: the "r_rel" field holds the
4359 information from the relocation on the literal (if there is one) and
4360 the "value" field holds the contents of the literal word itself.
4362 The value_map structure records a literal value along with the
4363 location of a literal holding that value. The value_map hash table
4364 is indexed by the literal value, so that we can quickly check if a
4365 particular literal value has been seen before and is thus a candidate
4368 typedef struct literal_value_struct literal_value;
4369 typedef struct value_map_struct value_map;
4370 typedef struct value_map_hash_table_struct value_map_hash_table;
4372 struct literal_value_struct
4375 unsigned long value;
4376 bfd_boolean is_abs_literal;
4379 struct value_map_struct
4381 literal_value val; /* The literal value. */
4382 r_reloc loc; /* Location of the literal. */
4386 struct value_map_hash_table_struct
4388 unsigned bucket_count;
4389 value_map **buckets;
4391 bfd_boolean has_last_loc;
4397 init_literal_value (literal_value *lit,
4398 const r_reloc *r_rel,
4399 unsigned long value,
4400 bfd_boolean is_abs_literal)
4402 lit->r_rel = *r_rel;
4404 lit->is_abs_literal = is_abs_literal;
4409 literal_value_equal (const literal_value *src1,
4410 const literal_value *src2,
4411 bfd_boolean final_static_link)
4413 struct elf_link_hash_entry *h1, *h2;
4415 if (r_reloc_is_const (&src1->r_rel) != r_reloc_is_const (&src2->r_rel))
4418 if (r_reloc_is_const (&src1->r_rel))
4419 return (src1->value == src2->value);
4421 if (ELF32_R_TYPE (src1->r_rel.rela.r_info)
4422 != ELF32_R_TYPE (src2->r_rel.rela.r_info))
4425 if (src1->r_rel.target_offset != src2->r_rel.target_offset)
4428 if (src1->r_rel.virtual_offset != src2->r_rel.virtual_offset)
4431 if (src1->value != src2->value)
4434 /* Now check for the same section (if defined) or the same elf_hash
4435 (if undefined or weak). */
4436 h1 = r_reloc_get_hash_entry (&src1->r_rel);
4437 h2 = r_reloc_get_hash_entry (&src2->r_rel);
4438 if (r_reloc_is_defined (&src1->r_rel)
4439 && (final_static_link
4440 || ((!h1 || h1->root.type != bfd_link_hash_defweak)
4441 && (!h2 || h2->root.type != bfd_link_hash_defweak))))
4443 if (r_reloc_get_section (&src1->r_rel)
4444 != r_reloc_get_section (&src2->r_rel))
4449 /* Require that the hash entries (i.e., symbols) be identical. */
4450 if (h1 != h2 || h1 == 0)
4454 if (src1->is_abs_literal != src2->is_abs_literal)
4461 /* Must be power of 2. */
4462 #define INITIAL_HASH_RELOC_BUCKET_COUNT 1024
4464 static value_map_hash_table *
4465 value_map_hash_table_init (void)
4467 value_map_hash_table *values;
4469 values = (value_map_hash_table *)
4470 bfd_zmalloc (sizeof (value_map_hash_table));
4471 values->bucket_count = INITIAL_HASH_RELOC_BUCKET_COUNT;
4473 values->buckets = (value_map **)
4474 bfd_zmalloc (sizeof (value_map *) * values->bucket_count);
4475 if (values->buckets == NULL)
4480 values->has_last_loc = FALSE;
4487 value_map_hash_table_delete (value_map_hash_table *table)
4489 free (table->buckets);
4495 hash_bfd_vma (bfd_vma val)
4497 return (val >> 2) + (val >> 10);
4502 literal_value_hash (const literal_value *src)
4506 hash_val = hash_bfd_vma (src->value);
4507 if (!r_reloc_is_const (&src->r_rel))
4511 hash_val += hash_bfd_vma (src->is_abs_literal * 1000);
4512 hash_val += hash_bfd_vma (src->r_rel.target_offset);
4513 hash_val += hash_bfd_vma (src->r_rel.virtual_offset);
4515 /* Now check for the same section and the same elf_hash. */
4516 if (r_reloc_is_defined (&src->r_rel))
4517 sec_or_hash = r_reloc_get_section (&src->r_rel);
4519 sec_or_hash = r_reloc_get_hash_entry (&src->r_rel);
4520 hash_val += hash_bfd_vma ((bfd_vma) (size_t) sec_or_hash);
4526 /* Check if the specified literal_value has been seen before. */
4529 value_map_get_cached_value (value_map_hash_table *map,
4530 const literal_value *val,
4531 bfd_boolean final_static_link)
4537 idx = literal_value_hash (val);
4538 idx = idx & (map->bucket_count - 1);
4539 bucket = map->buckets[idx];
4540 for (map_e = bucket; map_e; map_e = map_e->next)
4542 if (literal_value_equal (&map_e->val, val, final_static_link))
4549 /* Record a new literal value. It is illegal to call this if VALUE
4550 already has an entry here. */
4553 add_value_map (value_map_hash_table *map,
4554 const literal_value *val,
4556 bfd_boolean final_static_link)
4558 value_map **bucket_p;
4561 value_map *val_e = (value_map *) bfd_zmalloc (sizeof (value_map));
4564 bfd_set_error (bfd_error_no_memory);
4568 BFD_ASSERT (!value_map_get_cached_value (map, val, final_static_link));
4572 idx = literal_value_hash (val);
4573 idx = idx & (map->bucket_count - 1);
4574 bucket_p = &map->buckets[idx];
4576 val_e->next = *bucket_p;
4579 /* FIXME: Consider resizing the hash table if we get too many entries. */
4585 /* Lists of text actions (ta_) for narrowing, widening, longcall
4586 conversion, space fill, code & literal removal, etc. */
4588 /* The following text actions are generated:
4590 "ta_remove_insn" remove an instruction or instructions
4591 "ta_remove_longcall" convert longcall to call
4592 "ta_convert_longcall" convert longcall to nop/call
4593 "ta_narrow_insn" narrow a wide instruction
4594 "ta_widen" widen a narrow instruction
4595 "ta_fill" add fill or remove fill
4596 removed < 0 is a fill; branches to the fill address will be
4597 changed to address + fill size (e.g., address - removed)
4598 removed >= 0 branches to the fill address will stay unchanged
4599 "ta_remove_literal" remove a literal; this action is
4600 indicated when a literal is removed
4602 "ta_add_literal" insert a new literal; this action is
4603 indicated when a literal has been moved.
4604 It may use a virtual_offset because
4605 multiple literals can be placed at the
4608 For each of these text actions, we also record the number of bytes
4609 removed by performing the text action. In the case of a "ta_widen"
4610 or a "ta_fill" that adds space, the removed_bytes will be negative. */
4612 typedef struct text_action_struct text_action;
4613 typedef struct text_action_list_struct text_action_list;
4614 typedef enum text_action_enum_t text_action_t;
4616 enum text_action_enum_t
4619 ta_remove_insn, /* removed = -size */
4620 ta_remove_longcall, /* removed = -size */
4621 ta_convert_longcall, /* removed = 0 */
4622 ta_narrow_insn, /* removed = -1 */
4623 ta_widen_insn, /* removed = +1 */
4624 ta_fill, /* removed = +size */
4630 /* Structure for a text action record. */
4631 struct text_action_struct
4633 text_action_t action;
4634 asection *sec; /* Optional */
4636 bfd_vma virtual_offset; /* Zero except for adding literals. */
4638 literal_value value; /* Only valid when adding literals. */
4644 /* List of all of the actions taken on a text section. */
4645 struct text_action_list_struct
4651 static text_action *
4652 find_fill_action (text_action_list *l, asection *sec, bfd_vma offset)
4656 /* It is not necessary to fill at the end of a section. */
4657 if (sec->size == offset)
4660 for (m_p = &l->head; *m_p && (*m_p)->offset <= offset; m_p = &(*m_p)->next)
4662 text_action *t = *m_p;
4663 /* When the action is another fill at the same address,
4664 just increase the size. */
4665 if (t->offset == offset && t->action == ta_fill)
4673 compute_removed_action_diff (const text_action *ta,
4677 int removable_space)
4680 int current_removed = 0;
4683 current_removed = ta->removed_bytes;
4685 BFD_ASSERT (ta == NULL || ta->offset == offset);
4686 BFD_ASSERT (ta == NULL || ta->action == ta_fill);
4688 /* It is not necessary to fill at the end of a section. Clean this up. */
4689 if (sec->size == offset)
4690 new_removed = removable_space - 0;
4694 int added = -removed - current_removed;
4695 /* Ignore multiples of the section alignment. */
4696 added = ((1 << sec->alignment_power) - 1) & added;
4697 new_removed = (-added);
4699 /* Modify for removable. */
4700 space = removable_space - new_removed;
4701 new_removed = (removable_space
4702 - (((1 << sec->alignment_power) - 1) & space));
4704 return (new_removed - current_removed);
4709 adjust_fill_action (text_action *ta, int fill_diff)
4711 ta->removed_bytes += fill_diff;
4715 /* Add a modification action to the text. For the case of adding or
4716 removing space, modify any current fill and assume that
4717 "unreachable_space" bytes can be freely contracted. Note that a
4718 negative removed value is a fill. */
4721 text_action_add (text_action_list *l,
4722 text_action_t action,
4730 /* It is not necessary to fill at the end of a section. */
4731 if (action == ta_fill && sec->size == offset)
4734 /* It is not necessary to fill 0 bytes. */
4735 if (action == ta_fill && removed == 0)
4738 for (m_p = &l->head; *m_p && (*m_p)->offset <= offset; m_p = &(*m_p)->next)
4740 text_action *t = *m_p;
4741 /* When the action is another fill at the same address,
4742 just increase the size. */
4743 if (t->offset == offset && t->action == ta_fill && action == ta_fill)
4745 t->removed_bytes += removed;
4750 /* Create a new record and fill it up. */
4751 ta = (text_action *) bfd_zmalloc (sizeof (text_action));
4752 ta->action = action;
4754 ta->offset = offset;
4755 ta->removed_bytes = removed;
4762 text_action_add_literal (text_action_list *l,
4763 text_action_t action,
4765 const literal_value *value,
4770 asection *sec = r_reloc_get_section (loc);
4771 bfd_vma offset = loc->target_offset;
4772 bfd_vma virtual_offset = loc->virtual_offset;
4774 BFD_ASSERT (action == ta_add_literal);
4776 for (m_p = &l->head; *m_p != NULL; m_p = &(*m_p)->next)
4778 if ((*m_p)->offset > offset
4779 && ((*m_p)->offset != offset
4780 || (*m_p)->virtual_offset > virtual_offset))
4784 /* Create a new record and fill it up. */
4785 ta = (text_action *) bfd_zmalloc (sizeof (text_action));
4786 ta->action = action;
4788 ta->offset = offset;
4789 ta->virtual_offset = virtual_offset;
4791 ta->removed_bytes = removed;
4798 offset_with_removed_text (text_action_list *action_list, bfd_vma offset)
4803 for (r = action_list->head; r && r->offset <= offset; r = r->next)
4805 if (r->offset < offset
4806 || (r->action == ta_fill && r->removed_bytes < 0))
4807 removed += r->removed_bytes;
4810 return (offset - removed);
4815 action_list_count (text_action_list *action_list)
4817 text_action *r = action_list->head;
4819 for (r = action_list->head; r != NULL; r = r->next)
4828 offset_with_removed_text_before_fill (text_action_list *action_list,
4834 for (r = action_list->head; r && r->offset < offset; r = r->next)
4835 removed += r->removed_bytes;
4837 return (offset - removed);
4841 /* The find_insn_action routine will only find non-fill actions. */
4843 static text_action *
4844 find_insn_action (text_action_list *action_list, bfd_vma offset)
4847 for (t = action_list->head; t; t = t->next)
4849 if (t->offset == offset)
4856 case ta_remove_insn:
4857 case ta_remove_longcall:
4858 case ta_convert_longcall:
4859 case ta_narrow_insn:
4862 case ta_remove_literal:
4863 case ta_add_literal:
4876 print_action_list (FILE *fp, text_action_list *action_list)
4880 fprintf (fp, "Text Action\n");
4881 for (r = action_list->head; r != NULL; r = r->next)
4883 const char *t = "unknown";
4886 case ta_remove_insn:
4887 t = "remove_insn"; break;
4888 case ta_remove_longcall:
4889 t = "remove_longcall"; break;
4890 case ta_convert_longcall:
4891 t = "remove_longcall"; break;
4892 case ta_narrow_insn:
4893 t = "narrow_insn"; break;
4895 t = "widen_insn"; break;
4900 case ta_remove_literal:
4901 t = "remove_literal"; break;
4902 case ta_add_literal:
4903 t = "add_literal"; break;
4906 fprintf (fp, "%s: %s[0x%lx] \"%s\" %d\n",
4907 r->sec->owner->filename,
4908 r->sec->name, r->offset, t, r->removed_bytes);
4915 /* Lists of literals being coalesced or removed. */
4917 /* In the usual case, the literal identified by "from" is being
4918 coalesced with another literal identified by "to". If the literal is
4919 unused and is being removed altogether, "to.abfd" will be NULL.
4920 The removed_literal entries are kept on a per-section list, sorted
4921 by the "from" offset field. */
4923 typedef struct removed_literal_struct removed_literal;
4924 typedef struct removed_literal_list_struct removed_literal_list;
4926 struct removed_literal_struct
4930 removed_literal *next;
4933 struct removed_literal_list_struct
4935 removed_literal *head;
4936 removed_literal *tail;
4940 /* Record that the literal at "from" is being removed. If "to" is not
4941 NULL, the "from" literal is being coalesced with the "to" literal. */
4944 add_removed_literal (removed_literal_list *removed_list,
4945 const r_reloc *from,
4948 removed_literal *r, *new_r, *next_r;
4950 new_r = (removed_literal *) bfd_zmalloc (sizeof (removed_literal));
4952 new_r->from = *from;
4956 new_r->to.abfd = NULL;
4959 r = removed_list->head;
4962 removed_list->head = new_r;
4963 removed_list->tail = new_r;
4965 /* Special check for common case of append. */
4966 else if (removed_list->tail->from.target_offset < from->target_offset)
4968 removed_list->tail->next = new_r;
4969 removed_list->tail = new_r;
4973 while (r->from.target_offset < from->target_offset && r->next)
4979 new_r->next = next_r;
4981 removed_list->tail = new_r;
4986 /* Check if the list of removed literals contains an entry for the
4987 given address. Return the entry if found. */
4989 static removed_literal *
4990 find_removed_literal (removed_literal_list *removed_list, bfd_vma addr)
4992 removed_literal *r = removed_list->head;
4993 while (r && r->from.target_offset < addr)
4995 if (r && r->from.target_offset == addr)
5004 print_removed_literals (FILE *fp, removed_literal_list *removed_list)
5007 r = removed_list->head;
5009 fprintf (fp, "Removed Literals\n");
5010 for (; r != NULL; r = r->next)
5012 print_r_reloc (fp, &r->from);
5013 fprintf (fp, " => ");
5014 if (r->to.abfd == NULL)
5015 fprintf (fp, "REMOVED");
5017 print_r_reloc (fp, &r->to);
5025 /* Per-section data for relaxation. */
5027 typedef struct reloc_bfd_fix_struct reloc_bfd_fix;
5029 struct xtensa_relax_info_struct
5031 bfd_boolean is_relaxable_literal_section;
5032 bfd_boolean is_relaxable_asm_section;
5033 int visited; /* Number of times visited. */
5035 source_reloc *src_relocs; /* Array[src_count]. */
5037 int src_next; /* Next src_relocs entry to assign. */
5039 removed_literal_list removed_list;
5040 text_action_list action_list;
5042 reloc_bfd_fix *fix_list;
5043 reloc_bfd_fix *fix_array;
5044 unsigned fix_array_count;
5046 /* Support for expanding the reloc array that is stored
5047 in the section structure. If the relocations have been
5048 reallocated, the newly allocated relocations will be referenced
5049 here along with the actual size allocated. The relocation
5050 count will always be found in the section structure. */
5051 Elf_Internal_Rela *allocated_relocs;
5052 unsigned relocs_count;
5053 unsigned allocated_relocs_count;
5056 struct elf_xtensa_section_data
5058 struct bfd_elf_section_data elf;
5059 xtensa_relax_info relax_info;
5064 elf_xtensa_new_section_hook (bfd *abfd, asection *sec)
5066 if (!sec->used_by_bfd)
5068 struct elf_xtensa_section_data *sdata;
5069 bfd_size_type amt = sizeof (*sdata);
5071 sdata = bfd_zalloc (abfd, amt);
5074 sec->used_by_bfd = sdata;
5077 return _bfd_elf_new_section_hook (abfd, sec);
5081 static xtensa_relax_info *
5082 get_xtensa_relax_info (asection *sec)
5084 struct elf_xtensa_section_data *section_data;
5086 /* No info available if no section or if it is an output section. */
5087 if (!sec || sec == sec->output_section)
5090 section_data = (struct elf_xtensa_section_data *) elf_section_data (sec);
5091 return §ion_data->relax_info;
5096 init_xtensa_relax_info (asection *sec)
5098 xtensa_relax_info *relax_info = get_xtensa_relax_info (sec);
5100 relax_info->is_relaxable_literal_section = FALSE;
5101 relax_info->is_relaxable_asm_section = FALSE;
5102 relax_info->visited = 0;
5104 relax_info->src_relocs = NULL;
5105 relax_info->src_count = 0;
5106 relax_info->src_next = 0;
5108 relax_info->removed_list.head = NULL;
5109 relax_info->removed_list.tail = NULL;
5111 relax_info->action_list.head = NULL;
5113 relax_info->fix_list = NULL;
5114 relax_info->fix_array = NULL;
5115 relax_info->fix_array_count = 0;
5117 relax_info->allocated_relocs = NULL;
5118 relax_info->relocs_count = 0;
5119 relax_info->allocated_relocs_count = 0;
5123 /* Coalescing literals may require a relocation to refer to a section in
5124 a different input file, but the standard relocation information
5125 cannot express that. Instead, the reloc_bfd_fix structures are used
5126 to "fix" the relocations that refer to sections in other input files.
5127 These structures are kept on per-section lists. The "src_type" field
5128 records the relocation type in case there are multiple relocations on
5129 the same location. FIXME: This is ugly; an alternative might be to
5130 add new symbols with the "owner" field to some other input file. */
5132 struct reloc_bfd_fix_struct
5136 unsigned src_type; /* Relocation type. */
5139 asection *target_sec;
5140 bfd_vma target_offset;
5141 bfd_boolean translated;
5143 reloc_bfd_fix *next;
5147 static reloc_bfd_fix *
5148 reloc_bfd_fix_init (asection *src_sec,
5152 asection *target_sec,
5153 bfd_vma target_offset,
5154 bfd_boolean translated)
5158 fix = (reloc_bfd_fix *) bfd_malloc (sizeof (reloc_bfd_fix));
5159 fix->src_sec = src_sec;
5160 fix->src_offset = src_offset;
5161 fix->src_type = src_type;
5162 fix->target_abfd = target_abfd;
5163 fix->target_sec = target_sec;
5164 fix->target_offset = target_offset;
5165 fix->translated = translated;
5172 add_fix (asection *src_sec, reloc_bfd_fix *fix)
5174 xtensa_relax_info *relax_info;
5176 relax_info = get_xtensa_relax_info (src_sec);
5177 fix->next = relax_info->fix_list;
5178 relax_info->fix_list = fix;
5183 fix_compare (const void *ap, const void *bp)
5185 const reloc_bfd_fix *a = (const reloc_bfd_fix *) ap;
5186 const reloc_bfd_fix *b = (const reloc_bfd_fix *) bp;
5188 if (a->src_offset != b->src_offset)
5189 return (a->src_offset - b->src_offset);
5190 return (a->src_type - b->src_type);
5195 cache_fix_array (asection *sec)
5197 unsigned i, count = 0;
5199 xtensa_relax_info *relax_info = get_xtensa_relax_info (sec);
5201 if (relax_info == NULL)
5203 if (relax_info->fix_list == NULL)
5206 for (r = relax_info->fix_list; r != NULL; r = r->next)
5209 relax_info->fix_array =
5210 (reloc_bfd_fix *) bfd_malloc (sizeof (reloc_bfd_fix) * count);
5211 relax_info->fix_array_count = count;
5213 r = relax_info->fix_list;
5214 for (i = 0; i < count; i++, r = r->next)
5216 relax_info->fix_array[count - 1 - i] = *r;
5217 relax_info->fix_array[count - 1 - i].next = NULL;
5220 qsort (relax_info->fix_array, relax_info->fix_array_count,
5221 sizeof (reloc_bfd_fix), fix_compare);
5225 static reloc_bfd_fix *
5226 get_bfd_fix (asection *sec, bfd_vma offset, unsigned type)
5228 xtensa_relax_info *relax_info = get_xtensa_relax_info (sec);
5232 if (relax_info == NULL)
5234 if (relax_info->fix_list == NULL)
5237 if (relax_info->fix_array == NULL)
5238 cache_fix_array (sec);
5240 key.src_offset = offset;
5241 key.src_type = type;
5242 rv = bsearch (&key, relax_info->fix_array, relax_info->fix_array_count,
5243 sizeof (reloc_bfd_fix), fix_compare);
5248 /* Section caching. */
5250 typedef struct section_cache_struct section_cache_t;
5252 struct section_cache_struct
5256 bfd_byte *contents; /* Cache of the section contents. */
5257 bfd_size_type content_length;
5259 property_table_entry *ptbl; /* Cache of the section property table. */
5262 Elf_Internal_Rela *relocs; /* Cache of the section relocations. */
5263 unsigned reloc_count;
5268 init_section_cache (section_cache_t *sec_cache)
5270 memset (sec_cache, 0, sizeof (*sec_cache));
5275 clear_section_cache (section_cache_t *sec_cache)
5279 release_contents (sec_cache->sec, sec_cache->contents);
5280 release_internal_relocs (sec_cache->sec, sec_cache->relocs);
5281 if (sec_cache->ptbl)
5282 free (sec_cache->ptbl);
5283 memset (sec_cache, 0, sizeof (sec_cache));
5289 section_cache_section (section_cache_t *sec_cache,
5291 struct bfd_link_info *link_info)
5294 property_table_entry *prop_table = NULL;
5296 bfd_byte *contents = NULL;
5297 Elf_Internal_Rela *internal_relocs = NULL;
5298 bfd_size_type sec_size;
5302 if (sec == sec_cache->sec)
5306 sec_size = bfd_get_section_limit (abfd, sec);
5308 /* Get the contents. */
5309 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
5310 if (contents == NULL && sec_size != 0)
5313 /* Get the relocations. */
5314 internal_relocs = retrieve_internal_relocs (abfd, sec,
5315 link_info->keep_memory);
5317 /* Get the entry table. */
5318 ptblsize = xtensa_read_table_entries (abfd, sec, &prop_table,
5319 XTENSA_PROP_SEC_NAME, FALSE);
5323 /* Fill in the new section cache. */
5324 clear_section_cache (sec_cache);
5325 memset (sec_cache, 0, sizeof (sec_cache));
5327 sec_cache->sec = sec;
5328 sec_cache->contents = contents;
5329 sec_cache->content_length = sec_size;
5330 sec_cache->relocs = internal_relocs;
5331 sec_cache->reloc_count = sec->reloc_count;
5332 sec_cache->pte_count = ptblsize;
5333 sec_cache->ptbl = prop_table;
5338 release_contents (sec, contents);
5339 release_internal_relocs (sec, internal_relocs);
5346 /* Extended basic blocks. */
5348 /* An ebb_struct represents an Extended Basic Block. Within this
5349 range, we guarantee that all instructions are decodable, the
5350 property table entries are contiguous, and no property table
5351 specifies a segment that cannot have instructions moved. This
5352 structure contains caches of the contents, property table and
5353 relocations for the specified section for easy use. The range is
5354 specified by ranges of indices for the byte offset, property table
5355 offsets and relocation offsets. These must be consistent. */
5357 typedef struct ebb_struct ebb_t;
5363 bfd_byte *contents; /* Cache of the section contents. */
5364 bfd_size_type content_length;
5366 property_table_entry *ptbl; /* Cache of the section property table. */
5369 Elf_Internal_Rela *relocs; /* Cache of the section relocations. */
5370 unsigned reloc_count;
5372 bfd_vma start_offset; /* Offset in section. */
5373 unsigned start_ptbl_idx; /* Offset in the property table. */
5374 unsigned start_reloc_idx; /* Offset in the relocations. */
5377 unsigned end_ptbl_idx;
5378 unsigned end_reloc_idx;
5380 bfd_boolean ends_section; /* Is this the last ebb in a section? */
5382 /* The unreachable property table at the end of this set of blocks;
5383 NULL if the end is not an unreachable block. */
5384 property_table_entry *ends_unreachable;
5388 enum ebb_target_enum
5391 EBB_DESIRE_TGT_ALIGN,
5392 EBB_REQUIRE_TGT_ALIGN,
5393 EBB_REQUIRE_LOOP_ALIGN,
5398 /* proposed_action_struct is similar to the text_action_struct except
5399 that is represents a potential transformation, not one that will
5400 occur. We build a list of these for an extended basic block
5401 and use them to compute the actual actions desired. We must be
5402 careful that the entire set of actual actions we perform do not
5403 break any relocations that would fit if the actions were not
5406 typedef struct proposed_action_struct proposed_action;
5408 struct proposed_action_struct
5410 enum ebb_target_enum align_type; /* for the target alignment */
5411 bfd_vma alignment_pow;
5412 text_action_t action;
5415 bfd_boolean do_action; /* If false, then we will not perform the action. */
5419 /* The ebb_constraint_struct keeps a set of proposed actions for an
5420 extended basic block. */
5422 typedef struct ebb_constraint_struct ebb_constraint;
5424 struct ebb_constraint_struct
5427 bfd_boolean start_movable;
5429 /* Bytes of extra space at the beginning if movable. */
5430 int start_extra_space;
5432 enum ebb_target_enum start_align;
5434 bfd_boolean end_movable;
5436 /* Bytes of extra space at the end if movable. */
5437 int end_extra_space;
5439 unsigned action_count;
5440 unsigned action_allocated;
5442 /* Array of proposed actions. */
5443 proposed_action *actions;
5445 /* Action alignments -- one for each proposed action. */
5446 enum ebb_target_enum *action_aligns;
5451 init_ebb_constraint (ebb_constraint *c)
5453 memset (c, 0, sizeof (ebb_constraint));
5458 free_ebb_constraint (ebb_constraint *c)
5466 init_ebb (ebb_t *ebb,
5469 bfd_size_type content_length,
5470 property_table_entry *prop_table,
5472 Elf_Internal_Rela *internal_relocs,
5473 unsigned reloc_count)
5475 memset (ebb, 0, sizeof (ebb_t));
5477 ebb->contents = contents;
5478 ebb->content_length = content_length;
5479 ebb->ptbl = prop_table;
5480 ebb->pte_count = ptblsize;
5481 ebb->relocs = internal_relocs;
5482 ebb->reloc_count = reloc_count;
5483 ebb->start_offset = 0;
5484 ebb->end_offset = ebb->content_length - 1;
5485 ebb->start_ptbl_idx = 0;
5486 ebb->end_ptbl_idx = ptblsize;
5487 ebb->start_reloc_idx = 0;
5488 ebb->end_reloc_idx = reloc_count;
5492 /* Extend the ebb to all decodable contiguous sections. The algorithm
5493 for building a basic block around an instruction is to push it
5494 forward until we hit the end of a section, an unreachable block or
5495 a block that cannot be transformed. Then we push it backwards
5496 searching for similar conditions. */
5498 static bfd_boolean extend_ebb_bounds_forward (ebb_t *);
5499 static bfd_boolean extend_ebb_bounds_backward (ebb_t *);
5500 static bfd_size_type insn_block_decodable_len
5501 (bfd_byte *, bfd_size_type, bfd_vma, bfd_size_type);
5504 extend_ebb_bounds (ebb_t *ebb)
5506 if (!extend_ebb_bounds_forward (ebb))
5508 if (!extend_ebb_bounds_backward (ebb))
5515 extend_ebb_bounds_forward (ebb_t *ebb)
5517 property_table_entry *the_entry, *new_entry;
5519 the_entry = &ebb->ptbl[ebb->end_ptbl_idx];
5521 /* Stop when (1) we cannot decode an instruction, (2) we are at
5522 the end of the property tables, (3) we hit a non-contiguous property
5523 table entry, (4) we hit a NO_TRANSFORM region. */
5528 bfd_size_type insn_block_len;
5530 entry_end = the_entry->address - ebb->sec->vma + the_entry->size;
5532 insn_block_decodable_len (ebb->contents, ebb->content_length,
5534 entry_end - ebb->end_offset);
5535 if (insn_block_len != (entry_end - ebb->end_offset))
5537 (*_bfd_error_handler)
5538 (_("%B(%A+0x%lx): could not decode instruction; possible configuration mismatch"),
5539 ebb->sec->owner, ebb->sec, ebb->end_offset + insn_block_len);
5542 ebb->end_offset += insn_block_len;
5544 if (ebb->end_offset == ebb->sec->size)
5545 ebb->ends_section = TRUE;
5547 /* Update the reloc counter. */
5548 while (ebb->end_reloc_idx + 1 < ebb->reloc_count
5549 && (ebb->relocs[ebb->end_reloc_idx + 1].r_offset
5552 ebb->end_reloc_idx++;
5555 if (ebb->end_ptbl_idx + 1 == ebb->pte_count)
5558 new_entry = &ebb->ptbl[ebb->end_ptbl_idx + 1];
5559 if (((new_entry->flags & XTENSA_PROP_INSN) == 0)
5560 || ((new_entry->flags & XTENSA_PROP_INSN_NO_TRANSFORM) != 0)
5561 || ((the_entry->flags & XTENSA_PROP_ALIGN) != 0))
5564 if (the_entry->address + the_entry->size != new_entry->address)
5567 the_entry = new_entry;
5568 ebb->end_ptbl_idx++;
5571 /* Quick check for an unreachable or end of file just at the end. */
5572 if (ebb->end_ptbl_idx + 1 == ebb->pte_count)
5574 if (ebb->end_offset == ebb->content_length)
5575 ebb->ends_section = TRUE;
5579 new_entry = &ebb->ptbl[ebb->end_ptbl_idx + 1];
5580 if ((new_entry->flags & XTENSA_PROP_UNREACHABLE) != 0
5581 && the_entry->address + the_entry->size == new_entry->address)
5582 ebb->ends_unreachable = new_entry;
5585 /* Any other ending requires exact alignment. */
5591 extend_ebb_bounds_backward (ebb_t *ebb)
5593 property_table_entry *the_entry, *new_entry;
5595 the_entry = &ebb->ptbl[ebb->start_ptbl_idx];
5597 /* Stop when (1) we cannot decode the instructions in the current entry.
5598 (2) we are at the beginning of the property tables, (3) we hit a
5599 non-contiguous property table entry, (4) we hit a NO_TRANSFORM region. */
5603 bfd_vma block_begin;
5604 bfd_size_type insn_block_len;
5606 block_begin = the_entry->address - ebb->sec->vma;
5608 insn_block_decodable_len (ebb->contents, ebb->content_length,
5610 ebb->start_offset - block_begin);
5611 if (insn_block_len != ebb->start_offset - block_begin)
5613 (*_bfd_error_handler)
5614 (_("%B(%A+0x%lx): could not decode instruction; possible configuration mismatch"),
5615 ebb->sec->owner, ebb->sec, ebb->end_offset + insn_block_len);
5618 ebb->start_offset -= insn_block_len;
5620 /* Update the reloc counter. */
5621 while (ebb->start_reloc_idx > 0
5622 && (ebb->relocs[ebb->start_reloc_idx - 1].r_offset
5623 >= ebb->start_offset))
5625 ebb->start_reloc_idx--;
5628 if (ebb->start_ptbl_idx == 0)
5631 new_entry = &ebb->ptbl[ebb->start_ptbl_idx - 1];
5632 if ((new_entry->flags & XTENSA_PROP_INSN) == 0
5633 || ((new_entry->flags & XTENSA_PROP_INSN_NO_TRANSFORM) != 0)
5634 || ((new_entry->flags & XTENSA_PROP_ALIGN) != 0))
5636 if (new_entry->address + new_entry->size != the_entry->address)
5639 the_entry = new_entry;
5640 ebb->start_ptbl_idx--;
5646 static bfd_size_type
5647 insn_block_decodable_len (bfd_byte *contents,
5648 bfd_size_type content_len,
5649 bfd_vma block_offset,
5650 bfd_size_type block_len)
5652 bfd_vma offset = block_offset;
5654 while (offset < block_offset + block_len)
5656 bfd_size_type insn_len = 0;
5658 insn_len = insn_decode_len (contents, content_len, offset);
5660 return (offset - block_offset);
5663 return (offset - block_offset);
5668 ebb_propose_action (ebb_constraint *c,
5669 enum ebb_target_enum align_type,
5670 bfd_vma alignment_pow,
5671 text_action_t action,
5674 bfd_boolean do_action)
5676 proposed_action *act;
5678 if (c->action_allocated <= c->action_count)
5680 unsigned new_allocated, i;
5681 proposed_action *new_actions;
5683 new_allocated = (c->action_count + 2) * 2;
5684 new_actions = (proposed_action *)
5685 bfd_zmalloc (sizeof (proposed_action) * new_allocated);
5687 for (i = 0; i < c->action_count; i++)
5688 new_actions[i] = c->actions[i];
5691 c->actions = new_actions;
5692 c->action_allocated = new_allocated;
5695 act = &c->actions[c->action_count];
5696 act->align_type = align_type;
5697 act->alignment_pow = alignment_pow;
5698 act->action = action;
5699 act->offset = offset;
5700 act->removed_bytes = removed_bytes;
5701 act->do_action = do_action;
5707 /* Access to internal relocations, section contents and symbols. */
5709 /* During relaxation, we need to modify relocations, section contents,
5710 and symbol definitions, and we need to keep the original values from
5711 being reloaded from the input files, i.e., we need to "pin" the
5712 modified values in memory. We also want to continue to observe the
5713 setting of the "keep-memory" flag. The following functions wrap the
5714 standard BFD functions to take care of this for us. */
5716 static Elf_Internal_Rela *
5717 retrieve_internal_relocs (bfd *abfd, asection *sec, bfd_boolean keep_memory)
5719 Elf_Internal_Rela *internal_relocs;
5721 if ((sec->flags & SEC_LINKER_CREATED) != 0)
5724 internal_relocs = elf_section_data (sec)->relocs;
5725 if (internal_relocs == NULL)
5726 internal_relocs = (_bfd_elf_link_read_relocs
5727 (abfd, sec, NULL, NULL, keep_memory));
5728 return internal_relocs;
5733 pin_internal_relocs (asection *sec, Elf_Internal_Rela *internal_relocs)
5735 elf_section_data (sec)->relocs = internal_relocs;
5740 release_internal_relocs (asection *sec, Elf_Internal_Rela *internal_relocs)
5743 && elf_section_data (sec)->relocs != internal_relocs)
5744 free (internal_relocs);
5749 retrieve_contents (bfd *abfd, asection *sec, bfd_boolean keep_memory)
5752 bfd_size_type sec_size;
5754 sec_size = bfd_get_section_limit (abfd, sec);
5755 contents = elf_section_data (sec)->this_hdr.contents;
5757 if (contents == NULL && sec_size != 0)
5759 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
5766 elf_section_data (sec)->this_hdr.contents = contents;
5773 pin_contents (asection *sec, bfd_byte *contents)
5775 elf_section_data (sec)->this_hdr.contents = contents;
5780 release_contents (asection *sec, bfd_byte *contents)
5782 if (contents && elf_section_data (sec)->this_hdr.contents != contents)
5787 static Elf_Internal_Sym *
5788 retrieve_local_syms (bfd *input_bfd)
5790 Elf_Internal_Shdr *symtab_hdr;
5791 Elf_Internal_Sym *isymbuf;
5794 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
5795 locsymcount = symtab_hdr->sh_info;
5797 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
5798 if (isymbuf == NULL && locsymcount != 0)
5799 isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, locsymcount, 0,
5802 /* Save the symbols for this input file so they won't be read again. */
5803 if (isymbuf && isymbuf != (Elf_Internal_Sym *) symtab_hdr->contents)
5804 symtab_hdr->contents = (unsigned char *) isymbuf;
5810 /* Code for link-time relaxation. */
5812 /* Initialization for relaxation: */
5813 static bfd_boolean analyze_relocations (struct bfd_link_info *);
5814 static bfd_boolean find_relaxable_sections
5815 (bfd *, asection *, struct bfd_link_info *, bfd_boolean *);
5816 static bfd_boolean collect_source_relocs
5817 (bfd *, asection *, struct bfd_link_info *);
5818 static bfd_boolean is_resolvable_asm_expansion
5819 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, struct bfd_link_info *,
5821 static Elf_Internal_Rela *find_associated_l32r_irel
5822 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, Elf_Internal_Rela *);
5823 static bfd_boolean compute_text_actions
5824 (bfd *, asection *, struct bfd_link_info *);
5825 static bfd_boolean compute_ebb_proposed_actions (ebb_constraint *);
5826 static bfd_boolean compute_ebb_actions (ebb_constraint *);
5827 static bfd_boolean check_section_ebb_pcrels_fit
5828 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, const ebb_constraint *,
5829 const xtensa_opcode *);
5830 static bfd_boolean check_section_ebb_reduces (const ebb_constraint *);
5831 static void text_action_add_proposed
5832 (text_action_list *, const ebb_constraint *, asection *);
5833 static int compute_fill_extra_space (property_table_entry *);
5836 static bfd_boolean compute_removed_literals
5837 (bfd *, asection *, struct bfd_link_info *, value_map_hash_table *);
5838 static Elf_Internal_Rela *get_irel_at_offset
5839 (asection *, Elf_Internal_Rela *, bfd_vma);
5840 static bfd_boolean is_removable_literal
5841 (const source_reloc *, int, const source_reloc *, int);
5842 static bfd_boolean remove_dead_literal
5843 (bfd *, asection *, struct bfd_link_info *, Elf_Internal_Rela *,
5844 Elf_Internal_Rela *, source_reloc *, property_table_entry *, int);
5845 static bfd_boolean identify_literal_placement
5846 (bfd *, asection *, bfd_byte *, struct bfd_link_info *,
5847 value_map_hash_table *, bfd_boolean *, Elf_Internal_Rela *, int,
5848 source_reloc *, property_table_entry *, int, section_cache_t *,
5850 static bfd_boolean relocations_reach (source_reloc *, int, const r_reloc *);
5851 static bfd_boolean coalesce_shared_literal
5852 (asection *, source_reloc *, property_table_entry *, int, value_map *);
5853 static bfd_boolean move_shared_literal
5854 (asection *, struct bfd_link_info *, source_reloc *, property_table_entry *,
5855 int, const r_reloc *, const literal_value *, section_cache_t *);
5858 static bfd_boolean relax_section (bfd *, asection *, struct bfd_link_info *);
5859 static bfd_boolean translate_section_fixes (asection *);
5860 static bfd_boolean translate_reloc_bfd_fix (reloc_bfd_fix *);
5861 static void translate_reloc (const r_reloc *, r_reloc *);
5862 static void shrink_dynamic_reloc_sections
5863 (struct bfd_link_info *, bfd *, asection *, Elf_Internal_Rela *);
5864 static bfd_boolean move_literal
5865 (bfd *, struct bfd_link_info *, asection *, bfd_vma, bfd_byte *,
5866 xtensa_relax_info *, Elf_Internal_Rela **, const literal_value *);
5867 static bfd_boolean relax_property_section
5868 (bfd *, asection *, struct bfd_link_info *);
5871 static bfd_boolean relax_section_symbols (bfd *, asection *);
5875 elf_xtensa_relax_section (bfd *abfd,
5877 struct bfd_link_info *link_info,
5880 static value_map_hash_table *values = NULL;
5881 static bfd_boolean relocations_analyzed = FALSE;
5882 xtensa_relax_info *relax_info;
5884 if (!relocations_analyzed)
5886 /* Do some overall initialization for relaxation. */
5887 values = value_map_hash_table_init ();
5890 relaxing_section = TRUE;
5891 if (!analyze_relocations (link_info))
5893 relocations_analyzed = TRUE;
5897 /* Don't mess with linker-created sections. */
5898 if ((sec->flags & SEC_LINKER_CREATED) != 0)
5901 relax_info = get_xtensa_relax_info (sec);
5902 BFD_ASSERT (relax_info != NULL);
5904 switch (relax_info->visited)
5907 /* Note: It would be nice to fold this pass into
5908 analyze_relocations, but it is important for this step that the
5909 sections be examined in link order. */
5910 if (!compute_removed_literals (abfd, sec, link_info, values))
5917 value_map_hash_table_delete (values);
5919 if (!relax_section (abfd, sec, link_info))
5925 if (!relax_section_symbols (abfd, sec))
5930 relax_info->visited++;
5935 /* Initialization for relaxation. */
5937 /* This function is called once at the start of relaxation. It scans
5938 all the input sections and marks the ones that are relaxable (i.e.,
5939 literal sections with L32R relocations against them), and then
5940 collects source_reloc information for all the relocations against
5941 those relaxable sections. During this process, it also detects
5942 longcalls, i.e., calls relaxed by the assembler into indirect
5943 calls, that can be optimized back into direct calls. Within each
5944 extended basic block (ebb) containing an optimized longcall, it
5945 computes a set of "text actions" that can be performed to remove
5946 the L32R associated with the longcall while optionally preserving
5947 branch target alignments. */
5950 analyze_relocations (struct bfd_link_info *link_info)
5954 bfd_boolean is_relaxable = FALSE;
5956 /* Initialize the per-section relaxation info. */
5957 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next)
5958 for (sec = abfd->sections; sec != NULL; sec = sec->next)
5960 init_xtensa_relax_info (sec);
5963 /* Mark relaxable sections (and count relocations against each one). */
5964 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next)
5965 for (sec = abfd->sections; sec != NULL; sec = sec->next)
5967 if (!find_relaxable_sections (abfd, sec, link_info, &is_relaxable))
5971 /* Bail out if there are no relaxable sections. */
5975 /* Allocate space for source_relocs. */
5976 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next)
5977 for (sec = abfd->sections; sec != NULL; sec = sec->next)
5979 xtensa_relax_info *relax_info;
5981 relax_info = get_xtensa_relax_info (sec);
5982 if (relax_info->is_relaxable_literal_section
5983 || relax_info->is_relaxable_asm_section)
5985 relax_info->src_relocs = (source_reloc *)
5986 bfd_malloc (relax_info->src_count * sizeof (source_reloc));
5990 /* Collect info on relocations against each relaxable section. */
5991 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next)
5992 for (sec = abfd->sections; sec != NULL; sec = sec->next)
5994 if (!collect_source_relocs (abfd, sec, link_info))
5998 /* Compute the text actions. */
5999 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next)
6000 for (sec = abfd->sections; sec != NULL; sec = sec->next)
6002 if (!compute_text_actions (abfd, sec, link_info))
6010 /* Find all the sections that might be relaxed. The motivation for
6011 this pass is that collect_source_relocs() needs to record _all_ the
6012 relocations that target each relaxable section. That is expensive
6013 and unnecessary unless the target section is actually going to be
6014 relaxed. This pass identifies all such sections by checking if
6015 they have L32Rs pointing to them. In the process, the total number
6016 of relocations targeting each section is also counted so that we
6017 know how much space to allocate for source_relocs against each
6018 relaxable literal section. */
6021 find_relaxable_sections (bfd *abfd,
6023 struct bfd_link_info *link_info,
6024 bfd_boolean *is_relaxable_p)
6026 Elf_Internal_Rela *internal_relocs;
6028 bfd_boolean ok = TRUE;
6030 xtensa_relax_info *source_relax_info;
6032 internal_relocs = retrieve_internal_relocs (abfd, sec,
6033 link_info->keep_memory);
6034 if (internal_relocs == NULL)
6037 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
6038 if (contents == NULL && sec->size != 0)
6044 source_relax_info = get_xtensa_relax_info (sec);
6045 for (i = 0; i < sec->reloc_count; i++)
6047 Elf_Internal_Rela *irel = &internal_relocs[i];
6049 asection *target_sec;
6050 xtensa_relax_info *target_relax_info;
6052 /* If this section has not already been marked as "relaxable", and
6053 if it contains any ASM_EXPAND relocations (marking expanded
6054 longcalls) that can be optimized into direct calls, then mark
6055 the section as "relaxable". */
6056 if (source_relax_info
6057 && !source_relax_info->is_relaxable_asm_section
6058 && ELF32_R_TYPE (irel->r_info) == R_XTENSA_ASM_EXPAND)
6060 bfd_boolean is_reachable = FALSE;
6061 if (is_resolvable_asm_expansion (abfd, sec, contents, irel,
6062 link_info, &is_reachable)
6065 source_relax_info->is_relaxable_asm_section = TRUE;
6066 *is_relaxable_p = TRUE;
6070 r_reloc_init (&r_rel, abfd, irel, contents,
6071 bfd_get_section_limit (abfd, sec));
6073 target_sec = r_reloc_get_section (&r_rel);
6074 target_relax_info = get_xtensa_relax_info (target_sec);
6075 if (!target_relax_info)
6078 /* Count PC-relative operand relocations against the target section.
6079 Note: The conditions tested here must match the conditions under
6080 which init_source_reloc is called in collect_source_relocs(). */
6081 if (is_operand_relocation (ELF32_R_TYPE (irel->r_info))
6082 && (!is_alt_relocation (ELF32_R_TYPE (irel->r_info))
6083 || is_l32r_relocation (abfd, sec, contents, irel)))
6084 target_relax_info->src_count++;
6086 if (is_l32r_relocation (abfd, sec, contents, irel)
6087 && r_reloc_is_defined (&r_rel))
6089 /* Mark the target section as relaxable. */
6090 target_relax_info->is_relaxable_literal_section = TRUE;
6091 *is_relaxable_p = TRUE;
6096 release_contents (sec, contents);
6097 release_internal_relocs (sec, internal_relocs);
6102 /* Record _all_ the relocations that point to relaxable sections, and
6103 get rid of ASM_EXPAND relocs by either converting them to
6104 ASM_SIMPLIFY or by removing them. */
6107 collect_source_relocs (bfd *abfd,
6109 struct bfd_link_info *link_info)
6111 Elf_Internal_Rela *internal_relocs;
6113 bfd_boolean ok = TRUE;
6115 bfd_size_type sec_size;
6117 internal_relocs = retrieve_internal_relocs (abfd, sec,
6118 link_info->keep_memory);
6119 if (internal_relocs == NULL)
6122 sec_size = bfd_get_section_limit (abfd, sec);
6123 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
6124 if (contents == NULL && sec_size != 0)
6130 /* Record relocations against relaxable literal sections. */
6131 for (i = 0; i < sec->reloc_count; i++)
6133 Elf_Internal_Rela *irel = &internal_relocs[i];
6135 asection *target_sec;
6136 xtensa_relax_info *target_relax_info;
6138 r_reloc_init (&r_rel, abfd, irel, contents, sec_size);
6140 target_sec = r_reloc_get_section (&r_rel);
6141 target_relax_info = get_xtensa_relax_info (target_sec);
6143 if (target_relax_info
6144 && (target_relax_info->is_relaxable_literal_section
6145 || target_relax_info->is_relaxable_asm_section))
6147 xtensa_opcode opcode = XTENSA_UNDEFINED;
6149 bfd_boolean is_abs_literal = FALSE;
6151 if (is_alt_relocation (ELF32_R_TYPE (irel->r_info)))
6153 /* None of the current alternate relocs are PC-relative,
6154 and only PC-relative relocs matter here. However, we
6155 still need to record the opcode for literal
6157 opcode = get_relocation_opcode (abfd, sec, contents, irel);
6158 if (opcode == get_l32r_opcode ())
6160 is_abs_literal = TRUE;
6164 opcode = XTENSA_UNDEFINED;
6166 else if (is_operand_relocation (ELF32_R_TYPE (irel->r_info)))
6168 opcode = get_relocation_opcode (abfd, sec, contents, irel);
6169 opnd = get_relocation_opnd (opcode, ELF32_R_TYPE (irel->r_info));
6172 if (opcode != XTENSA_UNDEFINED)
6174 int src_next = target_relax_info->src_next++;
6175 source_reloc *s_reloc = &target_relax_info->src_relocs[src_next];
6177 init_source_reloc (s_reloc, sec, &r_rel, opcode, opnd,
6183 /* Now get rid of ASM_EXPAND relocations. At this point, the
6184 src_relocs array for the target literal section may still be
6185 incomplete, but it must at least contain the entries for the L32R
6186 relocations associated with ASM_EXPANDs because they were just
6187 added in the preceding loop over the relocations. */
6189 for (i = 0; i < sec->reloc_count; i++)
6191 Elf_Internal_Rela *irel = &internal_relocs[i];
6192 bfd_boolean is_reachable;
6194 if (!is_resolvable_asm_expansion (abfd, sec, contents, irel, link_info,
6200 Elf_Internal_Rela *l32r_irel;
6202 asection *target_sec;
6203 xtensa_relax_info *target_relax_info;
6205 /* Mark the source_reloc for the L32R so that it will be
6206 removed in compute_removed_literals(), along with the
6207 associated literal. */
6208 l32r_irel = find_associated_l32r_irel (abfd, sec, contents,
6209 irel, internal_relocs);
6210 if (l32r_irel == NULL)
6213 r_reloc_init (&r_rel, abfd, l32r_irel, contents, sec_size);
6215 target_sec = r_reloc_get_section (&r_rel);
6216 target_relax_info = get_xtensa_relax_info (target_sec);
6218 if (target_relax_info
6219 && (target_relax_info->is_relaxable_literal_section
6220 || target_relax_info->is_relaxable_asm_section))
6222 source_reloc *s_reloc;
6224 /* Search the source_relocs for the entry corresponding to
6225 the l32r_irel. Note: The src_relocs array is not yet
6226 sorted, but it wouldn't matter anyway because we're
6227 searching by source offset instead of target offset. */
6228 s_reloc = find_source_reloc (target_relax_info->src_relocs,
6229 target_relax_info->src_next,
6231 BFD_ASSERT (s_reloc);
6232 s_reloc->is_null = TRUE;
6235 /* Convert this reloc to ASM_SIMPLIFY. */
6236 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
6237 R_XTENSA_ASM_SIMPLIFY);
6238 l32r_irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
6240 pin_internal_relocs (sec, internal_relocs);
6244 /* It is resolvable but doesn't reach. We resolve now
6245 by eliminating the relocation -- the call will remain
6246 expanded into L32R/CALLX. */
6247 irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
6248 pin_internal_relocs (sec, internal_relocs);
6253 release_contents (sec, contents);
6254 release_internal_relocs (sec, internal_relocs);
6259 /* Return TRUE if the asm expansion can be resolved. Generally it can
6260 be resolved on a final link or when a partial link locates it in the
6261 same section as the target. Set "is_reachable" flag if the target of
6262 the call is within the range of a direct call, given the current VMA
6263 for this section and the target section. */
6266 is_resolvable_asm_expansion (bfd *abfd,
6269 Elf_Internal_Rela *irel,
6270 struct bfd_link_info *link_info,
6271 bfd_boolean *is_reachable_p)
6273 asection *target_sec;
6274 bfd_vma target_offset;
6276 xtensa_opcode opcode, direct_call_opcode;
6277 bfd_vma self_address;
6278 bfd_vma dest_address;
6279 bfd_boolean uses_l32r;
6280 bfd_size_type sec_size;
6282 *is_reachable_p = FALSE;
6284 if (contents == NULL)
6287 if (ELF32_R_TYPE (irel->r_info) != R_XTENSA_ASM_EXPAND)
6290 sec_size = bfd_get_section_limit (abfd, sec);
6291 opcode = get_expanded_call_opcode (contents + irel->r_offset,
6292 sec_size - irel->r_offset, &uses_l32r);
6293 /* Optimization of longcalls that use CONST16 is not yet implemented. */
6297 direct_call_opcode = swap_callx_for_call_opcode (opcode);
6298 if (direct_call_opcode == XTENSA_UNDEFINED)
6301 /* Check and see that the target resolves. */
6302 r_reloc_init (&r_rel, abfd, irel, contents, sec_size);
6303 if (!r_reloc_is_defined (&r_rel))
6306 target_sec = r_reloc_get_section (&r_rel);
6307 target_offset = r_rel.target_offset;
6309 /* If the target is in a shared library, then it doesn't reach. This
6310 isn't supposed to come up because the compiler should never generate
6311 non-PIC calls on systems that use shared libraries, but the linker
6312 shouldn't crash regardless. */
6313 if (!target_sec->output_section)
6316 /* For relocatable sections, we can only simplify when the output
6317 section of the target is the same as the output section of the
6319 if (link_info->relocatable
6320 && (target_sec->output_section != sec->output_section
6321 || is_reloc_sym_weak (abfd, irel)))
6324 self_address = (sec->output_section->vma
6325 + sec->output_offset + irel->r_offset + 3);
6326 dest_address = (target_sec->output_section->vma
6327 + target_sec->output_offset + target_offset);
6329 *is_reachable_p = pcrel_reloc_fits (direct_call_opcode, 0,
6330 self_address, dest_address);
6332 if ((self_address >> CALL_SEGMENT_BITS) !=
6333 (dest_address >> CALL_SEGMENT_BITS))
6340 static Elf_Internal_Rela *
6341 find_associated_l32r_irel (bfd *abfd,
6344 Elf_Internal_Rela *other_irel,
6345 Elf_Internal_Rela *internal_relocs)
6349 for (i = 0; i < sec->reloc_count; i++)
6351 Elf_Internal_Rela *irel = &internal_relocs[i];
6353 if (irel == other_irel)
6355 if (irel->r_offset != other_irel->r_offset)
6357 if (is_l32r_relocation (abfd, sec, contents, irel))
6365 static xtensa_opcode *
6366 build_reloc_opcodes (bfd *abfd,
6369 Elf_Internal_Rela *internal_relocs)
6372 xtensa_opcode *reloc_opcodes =
6373 (xtensa_opcode *) bfd_malloc (sizeof (xtensa_opcode) * sec->reloc_count);
6374 for (i = 0; i < sec->reloc_count; i++)
6376 Elf_Internal_Rela *irel = &internal_relocs[i];
6377 reloc_opcodes[i] = get_relocation_opcode (abfd, sec, contents, irel);
6379 return reloc_opcodes;
6383 /* The compute_text_actions function will build a list of potential
6384 transformation actions for code in the extended basic block of each
6385 longcall that is optimized to a direct call. From this list we
6386 generate a set of actions to actually perform that optimizes for
6387 space and, if not using size_opt, maintains branch target
6390 These actions to be performed are placed on a per-section list.
6391 The actual changes are performed by relax_section() in the second
6395 compute_text_actions (bfd *abfd,
6397 struct bfd_link_info *link_info)
6399 xtensa_opcode *reloc_opcodes = NULL;
6400 xtensa_relax_info *relax_info;
6402 Elf_Internal_Rela *internal_relocs;
6403 bfd_boolean ok = TRUE;
6405 property_table_entry *prop_table = 0;
6407 bfd_size_type sec_size;
6408 static bfd_boolean no_insn_move = FALSE;
6413 /* Do nothing if the section contains no optimized longcalls. */
6414 relax_info = get_xtensa_relax_info (sec);
6415 BFD_ASSERT (relax_info);
6416 if (!relax_info->is_relaxable_asm_section)
6419 internal_relocs = retrieve_internal_relocs (abfd, sec,
6420 link_info->keep_memory);
6422 if (internal_relocs)
6423 qsort (internal_relocs, sec->reloc_count, sizeof (Elf_Internal_Rela),
6424 internal_reloc_compare);
6426 sec_size = bfd_get_section_limit (abfd, sec);
6427 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
6428 if (contents == NULL && sec_size != 0)
6434 ptblsize = xtensa_read_table_entries (abfd, sec, &prop_table,
6435 XTENSA_PROP_SEC_NAME, FALSE);
6442 for (i = 0; i < sec->reloc_count; i++)
6444 Elf_Internal_Rela *irel = &internal_relocs[i];
6446 property_table_entry *the_entry;
6449 ebb_constraint ebb_table;
6450 bfd_size_type simplify_size;
6452 if (irel && ELF32_R_TYPE (irel->r_info) != R_XTENSA_ASM_SIMPLIFY)
6454 r_offset = irel->r_offset;
6456 simplify_size = get_asm_simplify_size (contents, sec_size, r_offset);
6457 if (simplify_size == 0)
6459 (*_bfd_error_handler)
6460 (_("%B(%A+0x%lx): could not decode instruction for XTENSA_ASM_SIMPLIFY relocation; possible configuration mismatch"),
6461 sec->owner, sec, r_offset);
6465 /* If the instruction table is not around, then don't do this
6467 the_entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
6468 sec->vma + irel->r_offset);
6469 if (the_entry == NULL || XTENSA_NO_NOP_REMOVAL)
6471 text_action_add (&relax_info->action_list,
6472 ta_convert_longcall, sec, r_offset,
6477 /* If the next longcall happens to be at the same address as an
6478 unreachable section of size 0, then skip forward. */
6479 ptbl_idx = the_entry - prop_table;
6480 while ((the_entry->flags & XTENSA_PROP_UNREACHABLE)
6481 && the_entry->size == 0
6482 && ptbl_idx + 1 < ptblsize
6483 && (prop_table[ptbl_idx + 1].address
6484 == prop_table[ptbl_idx].address))
6490 if (the_entry->flags & XTENSA_PROP_INSN_NO_TRANSFORM)
6491 /* NO_REORDER is OK */
6494 init_ebb_constraint (&ebb_table);
6495 ebb = &ebb_table.ebb;
6496 init_ebb (ebb, sec, contents, sec_size, prop_table, ptblsize,
6497 internal_relocs, sec->reloc_count);
6498 ebb->start_offset = r_offset + simplify_size;
6499 ebb->end_offset = r_offset + simplify_size;
6500 ebb->start_ptbl_idx = ptbl_idx;
6501 ebb->end_ptbl_idx = ptbl_idx;
6502 ebb->start_reloc_idx = i;
6503 ebb->end_reloc_idx = i;
6505 /* Precompute the opcode for each relocation. */
6506 if (reloc_opcodes == NULL)
6507 reloc_opcodes = build_reloc_opcodes (abfd, sec, contents,
6510 if (!extend_ebb_bounds (ebb)
6511 || !compute_ebb_proposed_actions (&ebb_table)
6512 || !compute_ebb_actions (&ebb_table)
6513 || !check_section_ebb_pcrels_fit (abfd, sec, contents,
6514 internal_relocs, &ebb_table,
6516 || !check_section_ebb_reduces (&ebb_table))
6518 /* If anything goes wrong or we get unlucky and something does
6519 not fit, with our plan because of expansion between
6520 critical branches, just convert to a NOP. */
6522 text_action_add (&relax_info->action_list,
6523 ta_convert_longcall, sec, r_offset, 0);
6524 i = ebb_table.ebb.end_reloc_idx;
6525 free_ebb_constraint (&ebb_table);
6529 text_action_add_proposed (&relax_info->action_list, &ebb_table, sec);
6531 /* Update the index so we do not go looking at the relocations
6532 we have already processed. */
6533 i = ebb_table.ebb.end_reloc_idx;
6534 free_ebb_constraint (&ebb_table);
6538 if (relax_info->action_list.head)
6539 print_action_list (stderr, &relax_info->action_list);
6543 release_contents (sec, contents);
6544 release_internal_relocs (sec, internal_relocs);
6548 free (reloc_opcodes);
6554 /* Do not widen an instruction if it is preceeded by a
6555 loop opcode. It might cause misalignment. */
6558 prev_instr_is_a_loop (bfd_byte *contents,
6559 bfd_size_type content_length,
6560 bfd_size_type offset)
6562 xtensa_opcode prev_opcode;
6566 prev_opcode = insn_decode_opcode (contents, content_length, offset-3, 0);
6567 return (xtensa_opcode_is_loop (xtensa_default_isa, prev_opcode) == 1);
6571 /* Find all of the possible actions for an extended basic block. */
6574 compute_ebb_proposed_actions (ebb_constraint *ebb_table)
6576 const ebb_t *ebb = &ebb_table->ebb;
6577 unsigned rel_idx = ebb->start_reloc_idx;
6578 property_table_entry *entry, *start_entry, *end_entry;
6580 xtensa_isa isa = xtensa_default_isa;
6582 static xtensa_insnbuf insnbuf = NULL;
6583 static xtensa_insnbuf slotbuf = NULL;
6585 if (insnbuf == NULL)
6587 insnbuf = xtensa_insnbuf_alloc (isa);
6588 slotbuf = xtensa_insnbuf_alloc (isa);
6591 start_entry = &ebb->ptbl[ebb->start_ptbl_idx];
6592 end_entry = &ebb->ptbl[ebb->end_ptbl_idx];
6594 for (entry = start_entry; entry <= end_entry; entry++)
6596 bfd_vma start_offset, end_offset;
6597 bfd_size_type insn_len;
6599 start_offset = entry->address - ebb->sec->vma;
6600 end_offset = entry->address + entry->size - ebb->sec->vma;
6602 if (entry == start_entry)
6603 start_offset = ebb->start_offset;
6604 if (entry == end_entry)
6605 end_offset = ebb->end_offset;
6606 offset = start_offset;
6608 if (offset == entry->address - ebb->sec->vma
6609 && (entry->flags & XTENSA_PROP_INSN_BRANCH_TARGET) != 0)
6611 enum ebb_target_enum align_type = EBB_DESIRE_TGT_ALIGN;
6612 BFD_ASSERT (offset != end_offset);
6613 if (offset == end_offset)
6616 insn_len = insn_decode_len (ebb->contents, ebb->content_length,
6621 if (check_branch_target_aligned_address (offset, insn_len))
6622 align_type = EBB_REQUIRE_TGT_ALIGN;
6624 ebb_propose_action (ebb_table, align_type, 0,
6625 ta_none, offset, 0, TRUE);
6628 while (offset != end_offset)
6630 Elf_Internal_Rela *irel;
6631 xtensa_opcode opcode;
6633 while (rel_idx < ebb->end_reloc_idx
6634 && (ebb->relocs[rel_idx].r_offset < offset
6635 || (ebb->relocs[rel_idx].r_offset == offset
6636 && (ELF32_R_TYPE (ebb->relocs[rel_idx].r_info)
6637 != R_XTENSA_ASM_SIMPLIFY))))
6640 /* Check for longcall. */
6641 irel = &ebb->relocs[rel_idx];
6642 if (irel->r_offset == offset
6643 && ELF32_R_TYPE (irel->r_info) == R_XTENSA_ASM_SIMPLIFY)
6645 bfd_size_type simplify_size;
6647 simplify_size = get_asm_simplify_size (ebb->contents,
6648 ebb->content_length,
6650 if (simplify_size == 0)
6653 ebb_propose_action (ebb_table, EBB_NO_ALIGN, 0,
6654 ta_convert_longcall, offset, 0, TRUE);
6656 offset += simplify_size;
6660 if (offset + MIN_INSN_LENGTH > ebb->content_length)
6662 xtensa_insnbuf_from_chars (isa, insnbuf, &ebb->contents[offset],
6663 ebb->content_length - offset);
6664 fmt = xtensa_format_decode (isa, insnbuf);
6665 if (fmt == XTENSA_UNDEFINED)
6667 insn_len = xtensa_format_length (isa, fmt);
6668 if (insn_len == (bfd_size_type) XTENSA_UNDEFINED)
6671 if (xtensa_format_num_slots (isa, fmt) != 1)
6677 xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf);
6678 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
6679 if (opcode == XTENSA_UNDEFINED)
6682 if ((entry->flags & XTENSA_PROP_INSN_NO_DENSITY) == 0
6683 && (entry->flags & XTENSA_PROP_INSN_NO_TRANSFORM) == 0
6684 && can_narrow_instruction (slotbuf, fmt, opcode) != 0)
6686 /* Add an instruction narrow action. */
6687 ebb_propose_action (ebb_table, EBB_NO_ALIGN, 0,
6688 ta_narrow_insn, offset, 0, FALSE);
6690 else if ((entry->flags & XTENSA_PROP_INSN_NO_TRANSFORM) == 0
6691 && can_widen_instruction (slotbuf, fmt, opcode) != 0
6692 && ! prev_instr_is_a_loop (ebb->contents,
6693 ebb->content_length, offset))
6695 /* Add an instruction widen action. */
6696 ebb_propose_action (ebb_table, EBB_NO_ALIGN, 0,
6697 ta_widen_insn, offset, 0, FALSE);
6699 else if (xtensa_opcode_is_loop (xtensa_default_isa, opcode) == 1)
6701 /* Check for branch targets. */
6702 ebb_propose_action (ebb_table, EBB_REQUIRE_LOOP_ALIGN, 0,
6703 ta_none, offset, 0, TRUE);
6710 if (ebb->ends_unreachable)
6712 ebb_propose_action (ebb_table, EBB_NO_ALIGN, 0,
6713 ta_fill, ebb->end_offset, 0, TRUE);
6719 (*_bfd_error_handler)
6720 (_("%B(%A+0x%lx): could not decode instruction; possible configuration mismatch"),
6721 ebb->sec->owner, ebb->sec, offset);
6726 /* After all of the information has collected about the
6727 transformations possible in an EBB, compute the appropriate actions
6728 here in compute_ebb_actions. We still must check later to make
6729 sure that the actions do not break any relocations. The algorithm
6730 used here is pretty greedy. Basically, it removes as many no-ops
6731 as possible so that the end of the EBB has the same alignment
6732 characteristics as the original. First, it uses narrowing, then
6733 fill space at the end of the EBB, and finally widenings. If that
6734 does not work, it tries again with one fewer no-op removed. The
6735 optimization will only be performed if all of the branch targets
6736 that were aligned before transformation are also aligned after the
6739 When the size_opt flag is set, ignore the branch target alignments,
6740 narrow all wide instructions, and remove all no-ops unless the end
6741 of the EBB prevents it. */
6744 compute_ebb_actions (ebb_constraint *ebb_table)
6748 int removed_bytes = 0;
6749 ebb_t *ebb = &ebb_table->ebb;
6750 unsigned seg_idx_start = 0;
6751 unsigned seg_idx_end = 0;
6753 /* We perform this like the assembler relaxation algorithm: Start by
6754 assuming all instructions are narrow and all no-ops removed; then
6757 /* For each segment of this that has a solid constraint, check to
6758 see if there are any combinations that will keep the constraint.
6760 for (seg_idx_end = 0; seg_idx_end < ebb_table->action_count; seg_idx_end++)
6762 bfd_boolean requires_text_end_align = FALSE;
6763 unsigned longcall_count = 0;
6764 unsigned longcall_convert_count = 0;
6765 unsigned narrowable_count = 0;
6766 unsigned narrowable_convert_count = 0;
6767 unsigned widenable_count = 0;
6768 unsigned widenable_convert_count = 0;
6770 proposed_action *action = NULL;
6771 int align = (1 << ebb_table->ebb.sec->alignment_power);
6773 seg_idx_start = seg_idx_end;
6775 for (i = seg_idx_start; i < ebb_table->action_count; i++)
6777 action = &ebb_table->actions[i];
6778 if (action->action == ta_convert_longcall)
6780 if (action->action == ta_narrow_insn)
6782 if (action->action == ta_widen_insn)
6784 if (action->action == ta_fill)
6786 if (action->align_type == EBB_REQUIRE_LOOP_ALIGN)
6788 if (action->align_type == EBB_REQUIRE_TGT_ALIGN
6789 && !elf32xtensa_size_opt)
6794 if (seg_idx_end == ebb_table->action_count && !ebb->ends_unreachable)
6795 requires_text_end_align = TRUE;
6797 if (elf32xtensa_size_opt && !requires_text_end_align
6798 && action->align_type != EBB_REQUIRE_LOOP_ALIGN
6799 && action->align_type != EBB_REQUIRE_TGT_ALIGN)
6801 longcall_convert_count = longcall_count;
6802 narrowable_convert_count = narrowable_count;
6803 widenable_convert_count = 0;
6807 /* There is a constraint. Convert the max number of longcalls. */
6808 narrowable_convert_count = 0;
6809 longcall_convert_count = 0;
6810 widenable_convert_count = 0;
6812 for (j = 0; j < longcall_count; j++)
6814 int removed = (longcall_count - j) * 3 & (align - 1);
6815 unsigned desire_narrow = (align - removed) & (align - 1);
6816 unsigned desire_widen = removed;
6817 if (desire_narrow <= narrowable_count)
6819 narrowable_convert_count = desire_narrow;
6820 narrowable_convert_count +=
6821 (align * ((narrowable_count - narrowable_convert_count)
6823 longcall_convert_count = (longcall_count - j);
6824 widenable_convert_count = 0;
6827 if (desire_widen <= widenable_count && !elf32xtensa_size_opt)
6829 narrowable_convert_count = 0;
6830 longcall_convert_count = longcall_count - j;
6831 widenable_convert_count = desire_widen;
6837 /* Now the number of conversions are saved. Do them. */
6838 for (i = seg_idx_start; i < seg_idx_end; i++)
6840 action = &ebb_table->actions[i];
6841 switch (action->action)
6843 case ta_convert_longcall:
6844 if (longcall_convert_count != 0)
6846 action->action = ta_remove_longcall;
6847 action->do_action = TRUE;
6848 action->removed_bytes += 3;
6849 longcall_convert_count--;
6852 case ta_narrow_insn:
6853 if (narrowable_convert_count != 0)
6855 action->do_action = TRUE;
6856 action->removed_bytes += 1;
6857 narrowable_convert_count--;
6861 if (widenable_convert_count != 0)
6863 action->do_action = TRUE;
6864 action->removed_bytes -= 1;
6865 widenable_convert_count--;
6874 /* Now we move on to some local opts. Try to remove each of the
6875 remaining longcalls. */
6877 if (ebb_table->ebb.ends_section || ebb_table->ebb.ends_unreachable)
6880 for (i = 0; i < ebb_table->action_count; i++)
6882 int old_removed_bytes = removed_bytes;
6883 proposed_action *action = &ebb_table->actions[i];
6885 if (action->do_action && action->action == ta_convert_longcall)
6887 bfd_boolean bad_alignment = FALSE;
6889 for (j = i + 1; j < ebb_table->action_count; j++)
6891 proposed_action *new_action = &ebb_table->actions[j];
6892 bfd_vma offset = new_action->offset;
6893 if (new_action->align_type == EBB_REQUIRE_TGT_ALIGN)
6895 if (!check_branch_target_aligned
6896 (ebb_table->ebb.contents,
6897 ebb_table->ebb.content_length,
6898 offset, offset - removed_bytes))
6900 bad_alignment = TRUE;
6904 if (new_action->align_type == EBB_REQUIRE_LOOP_ALIGN)
6906 if (!check_loop_aligned (ebb_table->ebb.contents,
6907 ebb_table->ebb.content_length,
6909 offset - removed_bytes))
6911 bad_alignment = TRUE;
6915 if (new_action->action == ta_narrow_insn
6916 && !new_action->do_action
6917 && ebb_table->ebb.sec->alignment_power == 2)
6919 /* Narrow an instruction and we are done. */
6920 new_action->do_action = TRUE;
6921 new_action->removed_bytes += 1;
6922 bad_alignment = FALSE;
6925 if (new_action->action == ta_widen_insn
6926 && new_action->do_action
6927 && ebb_table->ebb.sec->alignment_power == 2)
6929 /* Narrow an instruction and we are done. */
6930 new_action->do_action = FALSE;
6931 new_action->removed_bytes += 1;
6932 bad_alignment = FALSE;
6938 action->removed_bytes += 3;
6939 action->action = ta_remove_longcall;
6940 action->do_action = TRUE;
6943 removed_bytes = old_removed_bytes;
6944 if (action->do_action)
6945 removed_bytes += action->removed_bytes;
6950 for (i = 0; i < ebb_table->action_count; ++i)
6952 proposed_action *action = &ebb_table->actions[i];
6953 if (action->do_action)
6954 removed_bytes += action->removed_bytes;
6957 if ((removed_bytes % (1 << ebb_table->ebb.sec->alignment_power)) != 0
6958 && ebb->ends_unreachable)
6960 proposed_action *action;
6964 BFD_ASSERT (ebb_table->action_count != 0);
6965 action = &ebb_table->actions[ebb_table->action_count - 1];
6966 BFD_ASSERT (action->action == ta_fill);
6967 BFD_ASSERT (ebb->ends_unreachable->flags & XTENSA_PROP_UNREACHABLE);
6969 extra_space = compute_fill_extra_space (ebb->ends_unreachable);
6970 br = action->removed_bytes + removed_bytes + extra_space;
6971 br = br & ((1 << ebb->sec->alignment_power ) - 1);
6973 action->removed_bytes = extra_space - br;
6979 /* The xlate_map is a sorted array of address mappings designed to
6980 answer the offset_with_removed_text() query with a binary search instead
6981 of a linear search through the section's action_list. */
6983 typedef struct xlate_map_entry xlate_map_entry_t;
6984 typedef struct xlate_map xlate_map_t;
6986 struct xlate_map_entry
6988 unsigned orig_address;
6989 unsigned new_address;
6995 unsigned entry_count;
6996 xlate_map_entry_t *entry;
7001 xlate_compare (const void *a_v, const void *b_v)
7003 const xlate_map_entry_t *a = (const xlate_map_entry_t *) a_v;
7004 const xlate_map_entry_t *b = (const xlate_map_entry_t *) b_v;
7005 if (a->orig_address < b->orig_address)
7007 if (a->orig_address > (b->orig_address + b->size - 1))
7014 xlate_offset_with_removed_text (const xlate_map_t *map,
7015 text_action_list *action_list,
7018 xlate_map_entry_t tmp;
7020 xlate_map_entry_t *e;
7023 return offset_with_removed_text (action_list, offset);
7025 if (map->entry_count == 0)
7028 tmp.orig_address = offset;
7029 tmp.new_address = offset;
7032 r = bsearch (&offset, map->entry, map->entry_count,
7033 sizeof (xlate_map_entry_t), &xlate_compare);
7034 e = (xlate_map_entry_t *) r;
7036 BFD_ASSERT (e != NULL);
7039 return e->new_address - e->orig_address + offset;
7043 /* Build a binary searchable offset translation map from a section's
7046 static xlate_map_t *
7047 build_xlate_map (asection *sec, xtensa_relax_info *relax_info)
7049 xlate_map_t *map = (xlate_map_t *) bfd_malloc (sizeof (xlate_map_t));
7050 text_action_list *action_list = &relax_info->action_list;
7051 unsigned num_actions = 0;
7054 xlate_map_entry_t *current_entry;
7059 num_actions = action_list_count (action_list);
7060 map->entry = (xlate_map_entry_t *)
7061 bfd_malloc (sizeof (xlate_map_entry_t) * (num_actions + 1));
7062 if (map->entry == NULL)
7067 map->entry_count = 0;
7070 current_entry = &map->entry[0];
7072 current_entry->orig_address = 0;
7073 current_entry->new_address = 0;
7074 current_entry->size = 0;
7076 for (r = action_list->head; r != NULL; r = r->next)
7078 unsigned orig_size = 0;
7082 case ta_remove_insn:
7083 case ta_convert_longcall:
7084 case ta_remove_literal:
7085 case ta_add_literal:
7087 case ta_remove_longcall:
7090 case ta_narrow_insn:
7099 current_entry->size =
7100 r->offset + orig_size - current_entry->orig_address;
7101 if (current_entry->size != 0)
7106 current_entry->orig_address = r->offset + orig_size;
7107 removed += r->removed_bytes;
7108 current_entry->new_address = r->offset + orig_size - removed;
7109 current_entry->size = 0;
7112 current_entry->size = (bfd_get_section_limit (sec->owner, sec)
7113 - current_entry->orig_address);
7114 if (current_entry->size != 0)
7121 /* Free an offset translation map. */
7124 free_xlate_map (xlate_map_t *map)
7126 if (map && map->entry)
7133 /* Use check_section_ebb_pcrels_fit to make sure that all of the
7134 relocations in a section will fit if a proposed set of actions
7138 check_section_ebb_pcrels_fit (bfd *abfd,
7141 Elf_Internal_Rela *internal_relocs,
7142 const ebb_constraint *constraint,
7143 const xtensa_opcode *reloc_opcodes)
7146 Elf_Internal_Rela *irel;
7147 xlate_map_t *xmap = NULL;
7148 bfd_boolean ok = TRUE;
7149 xtensa_relax_info *relax_info;
7151 relax_info = get_xtensa_relax_info (sec);
7153 if (relax_info && sec->reloc_count > 100)
7155 xmap = build_xlate_map (sec, relax_info);
7156 /* NULL indicates out of memory, but the slow version
7157 can still be used. */
7160 for (i = 0; i < sec->reloc_count; i++)
7163 bfd_vma orig_self_offset, orig_target_offset;
7164 bfd_vma self_offset, target_offset;
7166 reloc_howto_type *howto;
7167 int self_removed_bytes, target_removed_bytes;
7169 irel = &internal_relocs[i];
7170 r_type = ELF32_R_TYPE (irel->r_info);
7172 howto = &elf_howto_table[r_type];
7173 /* We maintain the required invariant: PC-relative relocations
7174 that fit before linking must fit after linking. Thus we only
7175 need to deal with relocations to the same section that are
7177 if (ELF32_R_TYPE (irel->r_info) == R_XTENSA_ASM_SIMPLIFY
7178 || !howto->pc_relative)
7181 r_reloc_init (&r_rel, abfd, irel, contents,
7182 bfd_get_section_limit (abfd, sec));
7184 if (r_reloc_get_section (&r_rel) != sec)
7187 orig_self_offset = irel->r_offset;
7188 orig_target_offset = r_rel.target_offset;
7190 self_offset = orig_self_offset;
7191 target_offset = orig_target_offset;
7196 xlate_offset_with_removed_text (xmap, &relax_info->action_list,
7199 xlate_offset_with_removed_text (xmap, &relax_info->action_list,
7200 orig_target_offset);
7203 self_removed_bytes = 0;
7204 target_removed_bytes = 0;
7206 for (j = 0; j < constraint->action_count; ++j)
7208 proposed_action *action = &constraint->actions[j];
7209 bfd_vma offset = action->offset;
7210 int removed_bytes = action->removed_bytes;
7211 if (offset < orig_self_offset
7212 || (offset == orig_self_offset && action->action == ta_fill
7213 && action->removed_bytes < 0))
7214 self_removed_bytes += removed_bytes;
7215 if (offset < orig_target_offset
7216 || (offset == orig_target_offset && action->action == ta_fill
7217 && action->removed_bytes < 0))
7218 target_removed_bytes += removed_bytes;
7220 self_offset -= self_removed_bytes;
7221 target_offset -= target_removed_bytes;
7223 /* Try to encode it. Get the operand and check. */
7224 if (is_alt_relocation (ELF32_R_TYPE (irel->r_info)))
7226 /* None of the current alternate relocs are PC-relative,
7227 and only PC-relative relocs matter here. */
7231 xtensa_opcode opcode;
7235 opcode = reloc_opcodes[i];
7237 opcode = get_relocation_opcode (abfd, sec, contents, irel);
7238 if (opcode == XTENSA_UNDEFINED)
7244 opnum = get_relocation_opnd (opcode, ELF32_R_TYPE (irel->r_info));
7245 if (opnum == XTENSA_UNDEFINED)
7251 if (!pcrel_reloc_fits (opcode, opnum, self_offset, target_offset))
7260 free_xlate_map (xmap);
7267 check_section_ebb_reduces (const ebb_constraint *constraint)
7272 for (i = 0; i < constraint->action_count; i++)
7274 const proposed_action *action = &constraint->actions[i];
7275 if (action->do_action)
7276 removed += action->removed_bytes;
7286 text_action_add_proposed (text_action_list *l,
7287 const ebb_constraint *ebb_table,
7292 for (i = 0; i < ebb_table->action_count; i++)
7294 proposed_action *action = &ebb_table->actions[i];
7296 if (!action->do_action)
7298 switch (action->action)
7300 case ta_remove_insn:
7301 case ta_remove_longcall:
7302 case ta_convert_longcall:
7303 case ta_narrow_insn:
7306 case ta_remove_literal:
7307 text_action_add (l, action->action, sec, action->offset,
7308 action->removed_bytes);
7321 compute_fill_extra_space (property_table_entry *entry)
7323 int fill_extra_space;
7328 if ((entry->flags & XTENSA_PROP_UNREACHABLE) == 0)
7331 fill_extra_space = entry->size;
7332 if ((entry->flags & XTENSA_PROP_ALIGN) != 0)
7334 /* Fill bytes for alignment:
7335 (2**n)-1 - (addr + (2**n)-1) & (2**n -1) */
7336 int pow = GET_XTENSA_PROP_ALIGNMENT (entry->flags);
7337 int nsm = (1 << pow) - 1;
7338 bfd_vma addr = entry->address + entry->size;
7339 bfd_vma align_fill = nsm - ((addr + nsm) & nsm);
7340 fill_extra_space += align_fill;
7342 return fill_extra_space;
7346 /* First relaxation pass. */
7348 /* If the section contains relaxable literals, check each literal to
7349 see if it has the same value as another literal that has already
7350 been seen, either in the current section or a previous one. If so,
7351 add an entry to the per-section list of removed literals. The
7352 actual changes are deferred until the next pass. */
7355 compute_removed_literals (bfd *abfd,
7357 struct bfd_link_info *link_info,
7358 value_map_hash_table *values)
7360 xtensa_relax_info *relax_info;
7362 Elf_Internal_Rela *internal_relocs;
7363 source_reloc *src_relocs, *rel;
7364 bfd_boolean ok = TRUE;
7365 property_table_entry *prop_table = NULL;
7368 bfd_boolean last_loc_is_prev = FALSE;
7369 bfd_vma last_target_offset = 0;
7370 section_cache_t target_sec_cache;
7371 bfd_size_type sec_size;
7373 init_section_cache (&target_sec_cache);
7375 /* Do nothing if it is not a relaxable literal section. */
7376 relax_info = get_xtensa_relax_info (sec);
7377 BFD_ASSERT (relax_info);
7378 if (!relax_info->is_relaxable_literal_section)
7381 internal_relocs = retrieve_internal_relocs (abfd, sec,
7382 link_info->keep_memory);
7384 sec_size = bfd_get_section_limit (abfd, sec);
7385 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
7386 if (contents == NULL && sec_size != 0)
7392 /* Sort the source_relocs by target offset. */
7393 src_relocs = relax_info->src_relocs;
7394 qsort (src_relocs, relax_info->src_count,
7395 sizeof (source_reloc), source_reloc_compare);
7396 qsort (internal_relocs, sec->reloc_count, sizeof (Elf_Internal_Rela),
7397 internal_reloc_compare);
7399 ptblsize = xtensa_read_table_entries (abfd, sec, &prop_table,
7400 XTENSA_PROP_SEC_NAME, FALSE);
7408 for (i = 0; i < relax_info->src_count; i++)
7410 Elf_Internal_Rela *irel = NULL;
7412 rel = &src_relocs[i];
7413 if (get_l32r_opcode () != rel->opcode)
7415 irel = get_irel_at_offset (sec, internal_relocs,
7416 rel->r_rel.target_offset);
7418 /* If the relocation on this is not a simple R_XTENSA_32 or
7419 R_XTENSA_PLT then do not consider it. This may happen when
7420 the difference of two symbols is used in a literal. */
7421 if (irel && (ELF32_R_TYPE (irel->r_info) != R_XTENSA_32
7422 && ELF32_R_TYPE (irel->r_info) != R_XTENSA_PLT))
7425 /* If the target_offset for this relocation is the same as the
7426 previous relocation, then we've already considered whether the
7427 literal can be coalesced. Skip to the next one.... */
7428 if (i != 0 && prev_i != -1
7429 && src_relocs[i-1].r_rel.target_offset == rel->r_rel.target_offset)
7433 if (last_loc_is_prev &&
7434 last_target_offset + 4 != rel->r_rel.target_offset)
7435 last_loc_is_prev = FALSE;
7437 /* Check if the relocation was from an L32R that is being removed
7438 because a CALLX was converted to a direct CALL, and check if
7439 there are no other relocations to the literal. */
7440 if (is_removable_literal (rel, i, src_relocs, relax_info->src_count))
7442 if (!remove_dead_literal (abfd, sec, link_info, internal_relocs,
7443 irel, rel, prop_table, ptblsize))
7448 last_target_offset = rel->r_rel.target_offset;
7452 if (!identify_literal_placement (abfd, sec, contents, link_info,
7454 &last_loc_is_prev, irel,
7455 relax_info->src_count - i, rel,
7456 prop_table, ptblsize,
7457 &target_sec_cache, rel->is_abs_literal))
7462 last_target_offset = rel->r_rel.target_offset;
7466 print_removed_literals (stderr, &relax_info->removed_list);
7467 print_action_list (stderr, &relax_info->action_list);
7471 if (prop_table) free (prop_table);
7472 clear_section_cache (&target_sec_cache);
7474 release_contents (sec, contents);
7475 release_internal_relocs (sec, internal_relocs);
7480 static Elf_Internal_Rela *
7481 get_irel_at_offset (asection *sec,
7482 Elf_Internal_Rela *internal_relocs,
7486 Elf_Internal_Rela *irel;
7488 Elf_Internal_Rela key;
7490 if (!internal_relocs)
7493 key.r_offset = offset;
7494 irel = bsearch (&key, internal_relocs, sec->reloc_count,
7495 sizeof (Elf_Internal_Rela), internal_reloc_matches);
7499 /* bsearch does not guarantee which will be returned if there are
7500 multiple matches. We need the first that is not an alignment. */
7501 i = irel - internal_relocs;
7504 if (internal_relocs[i-1].r_offset != offset)
7508 for ( ; i < sec->reloc_count; i++)
7510 irel = &internal_relocs[i];
7511 r_type = ELF32_R_TYPE (irel->r_info);
7512 if (irel->r_offset == offset && r_type != R_XTENSA_NONE)
7521 is_removable_literal (const source_reloc *rel,
7523 const source_reloc *src_relocs,
7526 const source_reloc *curr_rel;
7530 for (++i; i < src_count; ++i)
7532 curr_rel = &src_relocs[i];
7533 /* If all others have the same target offset.... */
7534 if (curr_rel->r_rel.target_offset != rel->r_rel.target_offset)
7537 if (!curr_rel->is_null
7538 && !xtensa_is_property_section (curr_rel->source_sec)
7539 && !(curr_rel->source_sec->flags & SEC_DEBUGGING))
7547 remove_dead_literal (bfd *abfd,
7549 struct bfd_link_info *link_info,
7550 Elf_Internal_Rela *internal_relocs,
7551 Elf_Internal_Rela *irel,
7553 property_table_entry *prop_table,
7556 property_table_entry *entry;
7557 xtensa_relax_info *relax_info;
7559 relax_info = get_xtensa_relax_info (sec);
7563 entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
7564 sec->vma + rel->r_rel.target_offset);
7566 /* Mark the unused literal so that it will be removed. */
7567 add_removed_literal (&relax_info->removed_list, &rel->r_rel, NULL);
7569 text_action_add (&relax_info->action_list,
7570 ta_remove_literal, sec, rel->r_rel.target_offset, 4);
7572 /* If the section is 4-byte aligned, do not add fill. */
7573 if (sec->alignment_power > 2)
7575 int fill_extra_space;
7576 bfd_vma entry_sec_offset;
7578 property_table_entry *the_add_entry;
7582 entry_sec_offset = entry->address - sec->vma + entry->size;
7584 entry_sec_offset = rel->r_rel.target_offset + 4;
7586 /* If the literal range is at the end of the section,
7588 the_add_entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
7590 fill_extra_space = compute_fill_extra_space (the_add_entry);
7592 fa = find_fill_action (&relax_info->action_list, sec, entry_sec_offset);
7593 removed_diff = compute_removed_action_diff (fa, sec, entry_sec_offset,
7594 -4, fill_extra_space);
7596 adjust_fill_action (fa, removed_diff);
7598 text_action_add (&relax_info->action_list,
7599 ta_fill, sec, entry_sec_offset, removed_diff);
7602 /* Zero out the relocation on this literal location. */
7605 if (elf_hash_table (link_info)->dynamic_sections_created)
7606 shrink_dynamic_reloc_sections (link_info, abfd, sec, irel);
7608 irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
7609 pin_internal_relocs (sec, internal_relocs);
7612 /* Do not modify "last_loc_is_prev". */
7618 identify_literal_placement (bfd *abfd,
7621 struct bfd_link_info *link_info,
7622 value_map_hash_table *values,
7623 bfd_boolean *last_loc_is_prev_p,
7624 Elf_Internal_Rela *irel,
7625 int remaining_src_rels,
7627 property_table_entry *prop_table,
7629 section_cache_t *target_sec_cache,
7630 bfd_boolean is_abs_literal)
7634 xtensa_relax_info *relax_info;
7635 bfd_boolean literal_placed = FALSE;
7637 unsigned long value;
7638 bfd_boolean final_static_link;
7639 bfd_size_type sec_size;
7641 relax_info = get_xtensa_relax_info (sec);
7645 sec_size = bfd_get_section_limit (abfd, sec);
7648 (!link_info->relocatable
7649 && !elf_hash_table (link_info)->dynamic_sections_created);
7651 /* The placement algorithm first checks to see if the literal is
7652 already in the value map. If so and the value map is reachable
7653 from all uses, then the literal is moved to that location. If
7654 not, then we identify the last location where a fresh literal was
7655 placed. If the literal can be safely moved there, then we do so.
7656 If not, then we assume that the literal is not to move and leave
7657 the literal where it is, marking it as the last literal
7660 /* Find the literal value. */
7662 r_reloc_init (&r_rel, abfd, irel, contents, sec_size);
7665 BFD_ASSERT (rel->r_rel.target_offset < sec_size);
7666 value = bfd_get_32 (abfd, contents + rel->r_rel.target_offset);
7668 init_literal_value (&val, &r_rel, value, is_abs_literal);
7670 /* Check if we've seen another literal with the same value that
7671 is in the same output section. */
7672 val_map = value_map_get_cached_value (values, &val, final_static_link);
7675 && (r_reloc_get_section (&val_map->loc)->output_section
7676 == sec->output_section)
7677 && relocations_reach (rel, remaining_src_rels, &val_map->loc)
7678 && coalesce_shared_literal (sec, rel, prop_table, ptblsize, val_map))
7680 /* No change to last_loc_is_prev. */
7681 literal_placed = TRUE;
7684 /* For relocatable links, do not try to move literals. To do it
7685 correctly might increase the number of relocations in an input
7686 section making the default relocatable linking fail. */
7687 if (!link_info->relocatable && !literal_placed
7688 && values->has_last_loc && !(*last_loc_is_prev_p))
7690 asection *target_sec = r_reloc_get_section (&values->last_loc);
7691 if (target_sec && target_sec->output_section == sec->output_section)
7693 /* Increment the virtual offset. */
7694 r_reloc try_loc = values->last_loc;
7695 try_loc.virtual_offset += 4;
7697 /* There is a last loc that was in the same output section. */
7698 if (relocations_reach (rel, remaining_src_rels, &try_loc)
7699 && move_shared_literal (sec, link_info, rel,
7700 prop_table, ptblsize,
7701 &try_loc, &val, target_sec_cache))
7703 values->last_loc.virtual_offset += 4;
7704 literal_placed = TRUE;
7706 val_map = add_value_map (values, &val, &try_loc,
7709 val_map->loc = try_loc;
7714 if (!literal_placed)
7716 /* Nothing worked, leave the literal alone but update the last loc. */
7717 values->has_last_loc = TRUE;
7718 values->last_loc = rel->r_rel;
7720 val_map = add_value_map (values, &val, &rel->r_rel, final_static_link);
7722 val_map->loc = rel->r_rel;
7723 *last_loc_is_prev_p = TRUE;
7730 /* Check if the original relocations (presumably on L32R instructions)
7731 identified by reloc[0..N] can be changed to reference the literal
7732 identified by r_rel. If r_rel is out of range for any of the
7733 original relocations, then we don't want to coalesce the original
7734 literal with the one at r_rel. We only check reloc[0..N], where the
7735 offsets are all the same as for reloc[0] (i.e., they're all
7736 referencing the same literal) and where N is also bounded by the
7737 number of remaining entries in the "reloc" array. The "reloc" array
7738 is sorted by target offset so we know all the entries for the same
7739 literal will be contiguous. */
7742 relocations_reach (source_reloc *reloc,
7743 int remaining_relocs,
7744 const r_reloc *r_rel)
7746 bfd_vma from_offset, source_address, dest_address;
7750 if (!r_reloc_is_defined (r_rel))
7753 sec = r_reloc_get_section (r_rel);
7754 from_offset = reloc[0].r_rel.target_offset;
7756 for (i = 0; i < remaining_relocs; i++)
7758 if (reloc[i].r_rel.target_offset != from_offset)
7761 /* Ignore relocations that have been removed. */
7762 if (reloc[i].is_null)
7765 /* The original and new output section for these must be the same
7766 in order to coalesce. */
7767 if (r_reloc_get_section (&reloc[i].r_rel)->output_section
7768 != sec->output_section)
7771 /* Absolute literals in the same output section can always be
7773 if (reloc[i].is_abs_literal)
7776 /* A literal with no PC-relative relocations can be moved anywhere. */
7777 if (reloc[i].opnd != -1)
7779 /* Otherwise, check to see that it fits. */
7780 source_address = (reloc[i].source_sec->output_section->vma
7781 + reloc[i].source_sec->output_offset
7782 + reloc[i].r_rel.rela.r_offset);
7783 dest_address = (sec->output_section->vma
7784 + sec->output_offset
7785 + r_rel->target_offset);
7787 if (!pcrel_reloc_fits (reloc[i].opcode, reloc[i].opnd,
7788 source_address, dest_address))
7797 /* Move a literal to another literal location because it is
7798 the same as the other literal value. */
7801 coalesce_shared_literal (asection *sec,
7803 property_table_entry *prop_table,
7807 property_table_entry *entry;
7809 property_table_entry *the_add_entry;
7811 xtensa_relax_info *relax_info;
7813 relax_info = get_xtensa_relax_info (sec);
7817 entry = elf_xtensa_find_property_entry
7818 (prop_table, ptblsize, sec->vma + rel->r_rel.target_offset);
7819 if (entry && (entry->flags & XTENSA_PROP_INSN_NO_TRANSFORM))
7822 /* Mark that the literal will be coalesced. */
7823 add_removed_literal (&relax_info->removed_list, &rel->r_rel, &val_map->loc);
7825 text_action_add (&relax_info->action_list,
7826 ta_remove_literal, sec, rel->r_rel.target_offset, 4);
7828 /* If the section is 4-byte aligned, do not add fill. */
7829 if (sec->alignment_power > 2)
7831 int fill_extra_space;
7832 bfd_vma entry_sec_offset;
7835 entry_sec_offset = entry->address - sec->vma + entry->size;
7837 entry_sec_offset = rel->r_rel.target_offset + 4;
7839 /* If the literal range is at the end of the section,
7841 fill_extra_space = 0;
7842 the_add_entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
7844 if (the_add_entry && (the_add_entry->flags & XTENSA_PROP_UNREACHABLE))
7845 fill_extra_space = the_add_entry->size;
7847 fa = find_fill_action (&relax_info->action_list, sec, entry_sec_offset);
7848 removed_diff = compute_removed_action_diff (fa, sec, entry_sec_offset,
7849 -4, fill_extra_space);
7851 adjust_fill_action (fa, removed_diff);
7853 text_action_add (&relax_info->action_list,
7854 ta_fill, sec, entry_sec_offset, removed_diff);
7861 /* Move a literal to another location. This may actually increase the
7862 total amount of space used because of alignments so we need to do
7863 this carefully. Also, it may make a branch go out of range. */
7866 move_shared_literal (asection *sec,
7867 struct bfd_link_info *link_info,
7869 property_table_entry *prop_table,
7871 const r_reloc *target_loc,
7872 const literal_value *lit_value,
7873 section_cache_t *target_sec_cache)
7875 property_table_entry *the_add_entry, *src_entry, *target_entry = NULL;
7876 text_action *fa, *target_fa;
7878 xtensa_relax_info *relax_info, *target_relax_info;
7879 asection *target_sec;
7881 ebb_constraint ebb_table;
7882 bfd_boolean relocs_fit;
7884 /* If this routine always returns FALSE, the literals that cannot be
7885 coalesced will not be moved. */
7886 if (elf32xtensa_no_literal_movement)
7889 relax_info = get_xtensa_relax_info (sec);
7893 target_sec = r_reloc_get_section (target_loc);
7894 target_relax_info = get_xtensa_relax_info (target_sec);
7896 /* Literals to undefined sections may not be moved because they
7897 must report an error. */
7898 if (bfd_is_und_section (target_sec))
7901 src_entry = elf_xtensa_find_property_entry
7902 (prop_table, ptblsize, sec->vma + rel->r_rel.target_offset);
7904 if (!section_cache_section (target_sec_cache, target_sec, link_info))
7907 target_entry = elf_xtensa_find_property_entry
7908 (target_sec_cache->ptbl, target_sec_cache->pte_count,
7909 target_sec->vma + target_loc->target_offset);
7914 /* Make sure that we have not broken any branches. */
7917 init_ebb_constraint (&ebb_table);
7918 ebb = &ebb_table.ebb;
7919 init_ebb (ebb, target_sec_cache->sec, target_sec_cache->contents,
7920 target_sec_cache->content_length,
7921 target_sec_cache->ptbl, target_sec_cache->pte_count,
7922 target_sec_cache->relocs, target_sec_cache->reloc_count);
7924 /* Propose to add 4 bytes + worst-case alignment size increase to
7926 ebb_propose_action (&ebb_table, EBB_NO_ALIGN, 0,
7927 ta_fill, target_loc->target_offset,
7928 -4 - (1 << target_sec->alignment_power), TRUE);
7930 /* Check all of the PC-relative relocations to make sure they still fit. */
7931 relocs_fit = check_section_ebb_pcrels_fit (target_sec->owner, target_sec,
7932 target_sec_cache->contents,
7933 target_sec_cache->relocs,
7939 text_action_add_literal (&target_relax_info->action_list,
7940 ta_add_literal, target_loc, lit_value, -4);
7942 if (target_sec->alignment_power > 2 && target_entry != src_entry)
7944 /* May need to add or remove some fill to maintain alignment. */
7945 int fill_extra_space;
7946 bfd_vma entry_sec_offset;
7949 target_entry->address - target_sec->vma + target_entry->size;
7951 /* If the literal range is at the end of the section,
7953 fill_extra_space = 0;
7955 elf_xtensa_find_property_entry (target_sec_cache->ptbl,
7956 target_sec_cache->pte_count,
7958 if (the_add_entry && (the_add_entry->flags & XTENSA_PROP_UNREACHABLE))
7959 fill_extra_space = the_add_entry->size;
7961 target_fa = find_fill_action (&target_relax_info->action_list,
7962 target_sec, entry_sec_offset);
7963 removed_diff = compute_removed_action_diff (target_fa, target_sec,
7964 entry_sec_offset, 4,
7967 adjust_fill_action (target_fa, removed_diff);
7969 text_action_add (&target_relax_info->action_list,
7970 ta_fill, target_sec, entry_sec_offset, removed_diff);
7973 /* Mark that the literal will be moved to the new location. */
7974 add_removed_literal (&relax_info->removed_list, &rel->r_rel, target_loc);
7976 /* Remove the literal. */
7977 text_action_add (&relax_info->action_list,
7978 ta_remove_literal, sec, rel->r_rel.target_offset, 4);
7980 /* If the section is 4-byte aligned, do not add fill. */
7981 if (sec->alignment_power > 2 && target_entry != src_entry)
7983 int fill_extra_space;
7984 bfd_vma entry_sec_offset;
7987 entry_sec_offset = src_entry->address - sec->vma + src_entry->size;
7989 entry_sec_offset = rel->r_rel.target_offset+4;
7991 /* If the literal range is at the end of the section,
7993 fill_extra_space = 0;
7994 the_add_entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
7996 if (the_add_entry && (the_add_entry->flags & XTENSA_PROP_UNREACHABLE))
7997 fill_extra_space = the_add_entry->size;
7999 fa = find_fill_action (&relax_info->action_list, sec, entry_sec_offset);
8000 removed_diff = compute_removed_action_diff (fa, sec, entry_sec_offset,
8001 -4, fill_extra_space);
8003 adjust_fill_action (fa, removed_diff);
8005 text_action_add (&relax_info->action_list,
8006 ta_fill, sec, entry_sec_offset, removed_diff);
8013 /* Second relaxation pass. */
8015 /* Modify all of the relocations to point to the right spot, and if this
8016 is a relaxable section, delete the unwanted literals and fix the
8020 relax_section (bfd *abfd, asection *sec, struct bfd_link_info *link_info)
8022 Elf_Internal_Rela *internal_relocs;
8023 xtensa_relax_info *relax_info;
8025 bfd_boolean ok = TRUE;
8027 bfd_boolean rv = FALSE;
8028 bfd_boolean virtual_action;
8029 bfd_size_type sec_size;
8031 sec_size = bfd_get_section_limit (abfd, sec);
8032 relax_info = get_xtensa_relax_info (sec);
8033 BFD_ASSERT (relax_info);
8035 /* First translate any of the fixes that have been added already. */
8036 translate_section_fixes (sec);
8038 /* Handle property sections (e.g., literal tables) specially. */
8039 if (xtensa_is_property_section (sec))
8041 BFD_ASSERT (!relax_info->is_relaxable_literal_section);
8042 return relax_property_section (abfd, sec, link_info);
8045 internal_relocs = retrieve_internal_relocs (abfd, sec,
8046 link_info->keep_memory);
8047 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
8048 if (contents == NULL && sec_size != 0)
8054 if (internal_relocs)
8056 for (i = 0; i < sec->reloc_count; i++)
8058 Elf_Internal_Rela *irel;
8059 xtensa_relax_info *target_relax_info;
8060 bfd_vma source_offset, old_source_offset;
8063 asection *target_sec;
8065 /* Locally change the source address.
8066 Translate the target to the new target address.
8067 If it points to this section and has been removed,
8071 irel = &internal_relocs[i];
8072 source_offset = irel->r_offset;
8073 old_source_offset = source_offset;
8075 r_type = ELF32_R_TYPE (irel->r_info);
8076 r_reloc_init (&r_rel, abfd, irel, contents,
8077 bfd_get_section_limit (abfd, sec));
8079 /* If this section could have changed then we may need to
8080 change the relocation's offset. */
8082 if (relax_info->is_relaxable_literal_section
8083 || relax_info->is_relaxable_asm_section)
8085 if (r_type != R_XTENSA_NONE
8086 && find_removed_literal (&relax_info->removed_list,
8089 /* Remove this relocation. */
8090 if (elf_hash_table (link_info)->dynamic_sections_created)
8091 shrink_dynamic_reloc_sections (link_info, abfd, sec, irel);
8092 irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
8093 irel->r_offset = offset_with_removed_text
8094 (&relax_info->action_list, irel->r_offset);
8095 pin_internal_relocs (sec, internal_relocs);
8099 if (r_type == R_XTENSA_ASM_SIMPLIFY)
8101 text_action *action =
8102 find_insn_action (&relax_info->action_list,
8104 if (action && (action->action == ta_convert_longcall
8105 || action->action == ta_remove_longcall))
8107 bfd_reloc_status_type retval;
8108 char *error_message = NULL;
8110 retval = contract_asm_expansion (contents, sec_size,
8111 irel, &error_message);
8112 if (retval != bfd_reloc_ok)
8114 (*link_info->callbacks->reloc_dangerous)
8115 (link_info, error_message, abfd, sec,
8119 /* Update the action so that the code that moves
8120 the contents will do the right thing. */
8121 if (action->action == ta_remove_longcall)
8122 action->action = ta_remove_insn;
8124 action->action = ta_none;
8125 /* Refresh the info in the r_rel. */
8126 r_reloc_init (&r_rel, abfd, irel, contents, sec_size);
8127 r_type = ELF32_R_TYPE (irel->r_info);
8131 source_offset = offset_with_removed_text
8132 (&relax_info->action_list, irel->r_offset);
8133 irel->r_offset = source_offset;
8136 /* If the target section could have changed then
8137 we may need to change the relocation's target offset. */
8139 target_sec = r_reloc_get_section (&r_rel);
8140 target_relax_info = get_xtensa_relax_info (target_sec);
8142 if (target_relax_info
8143 && (target_relax_info->is_relaxable_literal_section
8144 || target_relax_info->is_relaxable_asm_section))
8148 bfd_vma addend_displacement;
8150 translate_reloc (&r_rel, &new_reloc);
8152 if (r_type == R_XTENSA_DIFF8
8153 || r_type == R_XTENSA_DIFF16
8154 || r_type == R_XTENSA_DIFF32)
8156 bfd_vma diff_value = 0, new_end_offset, diff_mask = 0;
8158 if (bfd_get_section_limit (abfd, sec) < old_source_offset)
8160 (*link_info->callbacks->reloc_dangerous)
8161 (link_info, _("invalid relocation address"),
8162 abfd, sec, old_source_offset);
8168 case R_XTENSA_DIFF8:
8170 bfd_get_8 (abfd, &contents[old_source_offset]);
8172 case R_XTENSA_DIFF16:
8174 bfd_get_16 (abfd, &contents[old_source_offset]);
8176 case R_XTENSA_DIFF32:
8178 bfd_get_32 (abfd, &contents[old_source_offset]);
8182 new_end_offset = offset_with_removed_text
8183 (&target_relax_info->action_list,
8184 r_rel.target_offset + diff_value);
8185 diff_value = new_end_offset - new_reloc.target_offset;
8189 case R_XTENSA_DIFF8:
8191 bfd_put_8 (abfd, diff_value,
8192 &contents[old_source_offset]);
8194 case R_XTENSA_DIFF16:
8196 bfd_put_16 (abfd, diff_value,
8197 &contents[old_source_offset]);
8199 case R_XTENSA_DIFF32:
8200 diff_mask = 0xffffffff;
8201 bfd_put_32 (abfd, diff_value,
8202 &contents[old_source_offset]);
8206 /* Check for overflow. */
8207 if ((diff_value & ~diff_mask) != 0)
8209 (*link_info->callbacks->reloc_dangerous)
8210 (link_info, _("overflow after relaxation"),
8211 abfd, sec, old_source_offset);
8215 pin_contents (sec, contents);
8218 /* FIXME: If the relocation still references a section in
8219 the same input file, the relocation should be modified
8220 directly instead of adding a "fix" record. */
8222 addend_displacement =
8223 new_reloc.target_offset + new_reloc.virtual_offset;
8225 fix = reloc_bfd_fix_init (sec, source_offset, r_type, 0,
8226 r_reloc_get_section (&new_reloc),
8227 addend_displacement, TRUE);
8231 pin_internal_relocs (sec, internal_relocs);
8235 if ((relax_info->is_relaxable_literal_section
8236 || relax_info->is_relaxable_asm_section)
8237 && relax_info->action_list.head)
8239 /* Walk through the planned actions and build up a table
8240 of move, copy and fill records. Use the move, copy and
8241 fill records to perform the actions once. */
8243 bfd_size_type size = sec->size;
8245 bfd_size_type final_size, copy_size, orig_insn_size;
8246 bfd_byte *scratch = NULL;
8247 bfd_byte *dup_contents = NULL;
8248 bfd_size_type orig_size = size;
8249 bfd_vma orig_dot = 0;
8250 bfd_vma orig_dot_copied = 0; /* Byte copied already from
8251 orig dot in physical memory. */
8252 bfd_vma orig_dot_vo = 0; /* Virtual offset from orig_dot. */
8253 bfd_vma dup_dot = 0;
8255 text_action *action = relax_info->action_list.head;
8257 final_size = sec->size;
8258 for (action = relax_info->action_list.head; action;
8259 action = action->next)
8261 final_size -= action->removed_bytes;
8264 scratch = (bfd_byte *) bfd_zmalloc (final_size);
8265 dup_contents = (bfd_byte *) bfd_zmalloc (final_size);
8267 /* The dot is the current fill location. */
8269 print_action_list (stderr, &relax_info->action_list);
8272 for (action = relax_info->action_list.head; action;
8273 action = action->next)
8275 virtual_action = FALSE;
8276 if (action->offset > orig_dot)
8278 orig_dot += orig_dot_copied;
8279 orig_dot_copied = 0;
8281 /* Out of the virtual world. */
8284 if (action->offset > orig_dot)
8286 copy_size = action->offset - orig_dot;
8287 memmove (&dup_contents[dup_dot], &contents[orig_dot], copy_size);
8288 orig_dot += copy_size;
8289 dup_dot += copy_size;
8290 BFD_ASSERT (action->offset == orig_dot);
8292 else if (action->offset < orig_dot)
8294 if (action->action == ta_fill
8295 && action->offset - action->removed_bytes == orig_dot)
8297 /* This is OK because the fill only effects the dup_dot. */
8299 else if (action->action == ta_add_literal)
8301 /* TBD. Might need to handle this. */
8304 if (action->offset == orig_dot)
8306 if (action->virtual_offset > orig_dot_vo)
8308 if (orig_dot_vo == 0)
8310 /* Need to copy virtual_offset bytes. Probably four. */
8311 copy_size = action->virtual_offset - orig_dot_vo;
8312 memmove (&dup_contents[dup_dot],
8313 &contents[orig_dot], copy_size);
8314 orig_dot_copied = copy_size;
8315 dup_dot += copy_size;
8317 virtual_action = TRUE;
8320 BFD_ASSERT (action->virtual_offset <= orig_dot_vo);
8322 switch (action->action)
8324 case ta_remove_literal:
8325 case ta_remove_insn:
8326 BFD_ASSERT (action->removed_bytes >= 0);
8327 orig_dot += action->removed_bytes;
8330 case ta_narrow_insn:
8333 memmove (scratch, &contents[orig_dot], orig_insn_size);
8334 BFD_ASSERT (action->removed_bytes == 1);
8335 rv = narrow_instruction (scratch, final_size, 0);
8337 memmove (&dup_contents[dup_dot], scratch, copy_size);
8338 orig_dot += orig_insn_size;
8339 dup_dot += copy_size;
8343 if (action->removed_bytes >= 0)
8344 orig_dot += action->removed_bytes;
8347 /* Already zeroed in dup_contents. Just bump the
8349 dup_dot += (-action->removed_bytes);
8354 BFD_ASSERT (action->removed_bytes == 0);
8357 case ta_convert_longcall:
8358 case ta_remove_longcall:
8359 /* These will be removed or converted before we get here. */
8366 memmove (scratch, &contents[orig_dot], orig_insn_size);
8367 BFD_ASSERT (action->removed_bytes == -1);
8368 rv = widen_instruction (scratch, final_size, 0);
8370 memmove (&dup_contents[dup_dot], scratch, copy_size);
8371 orig_dot += orig_insn_size;
8372 dup_dot += copy_size;
8375 case ta_add_literal:
8378 BFD_ASSERT (action->removed_bytes == -4);
8379 /* TBD -- place the literal value here and insert
8381 memset (&dup_contents[dup_dot], 0, 4);
8382 pin_internal_relocs (sec, internal_relocs);
8383 pin_contents (sec, contents);
8385 if (!move_literal (abfd, link_info, sec, dup_dot, dup_contents,
8386 relax_info, &internal_relocs, &action->value))
8390 orig_dot_vo += copy_size;
8392 orig_dot += orig_insn_size;
8393 dup_dot += copy_size;
8397 /* Not implemented yet. */
8402 size -= action->removed_bytes;
8403 removed += action->removed_bytes;
8404 BFD_ASSERT (dup_dot <= final_size);
8405 BFD_ASSERT (orig_dot <= orig_size);
8408 orig_dot += orig_dot_copied;
8409 orig_dot_copied = 0;
8411 if (orig_dot != orig_size)
8413 copy_size = orig_size - orig_dot;
8414 BFD_ASSERT (orig_size > orig_dot);
8415 BFD_ASSERT (dup_dot + copy_size == final_size);
8416 memmove (&dup_contents[dup_dot], &contents[orig_dot], copy_size);
8417 orig_dot += copy_size;
8418 dup_dot += copy_size;
8420 BFD_ASSERT (orig_size == orig_dot);
8421 BFD_ASSERT (final_size == dup_dot);
8423 /* Move the dup_contents back. */
8424 if (final_size > orig_size)
8426 /* Contents need to be reallocated. Swap the dup_contents into
8428 sec->contents = dup_contents;
8430 contents = dup_contents;
8431 pin_contents (sec, contents);
8435 BFD_ASSERT (final_size <= orig_size);
8436 memset (contents, 0, orig_size);
8437 memcpy (contents, dup_contents, final_size);
8438 free (dup_contents);
8441 pin_contents (sec, contents);
8443 sec->size = final_size;
8447 release_internal_relocs (sec, internal_relocs);
8448 release_contents (sec, contents);
8454 translate_section_fixes (asection *sec)
8456 xtensa_relax_info *relax_info;
8459 relax_info = get_xtensa_relax_info (sec);
8463 for (r = relax_info->fix_list; r != NULL; r = r->next)
8464 if (!translate_reloc_bfd_fix (r))
8471 /* Translate a fix given the mapping in the relax info for the target
8472 section. If it has already been translated, no work is required. */
8475 translate_reloc_bfd_fix (reloc_bfd_fix *fix)
8477 reloc_bfd_fix new_fix;
8479 xtensa_relax_info *relax_info;
8480 removed_literal *removed;
8481 bfd_vma new_offset, target_offset;
8483 if (fix->translated)
8486 sec = fix->target_sec;
8487 target_offset = fix->target_offset;
8489 relax_info = get_xtensa_relax_info (sec);
8492 fix->translated = TRUE;
8498 /* The fix does not need to be translated if the section cannot change. */
8499 if (!relax_info->is_relaxable_literal_section
8500 && !relax_info->is_relaxable_asm_section)
8502 fix->translated = TRUE;
8506 /* If the literal has been moved and this relocation was on an
8507 opcode, then the relocation should move to the new literal
8508 location. Otherwise, the relocation should move within the
8512 if (is_operand_relocation (fix->src_type))
8514 /* Check if the original relocation is against a literal being
8516 removed = find_removed_literal (&relax_info->removed_list,
8524 /* The fact that there is still a relocation to this literal indicates
8525 that the literal is being coalesced, not simply removed. */
8526 BFD_ASSERT (removed->to.abfd != NULL);
8528 /* This was moved to some other address (possibly another section). */
8529 new_sec = r_reloc_get_section (&removed->to);
8533 relax_info = get_xtensa_relax_info (sec);
8535 (!relax_info->is_relaxable_literal_section
8536 && !relax_info->is_relaxable_asm_section))
8538 target_offset = removed->to.target_offset;
8539 new_fix.target_sec = new_sec;
8540 new_fix.target_offset = target_offset;
8541 new_fix.translated = TRUE;
8546 target_offset = removed->to.target_offset;
8547 new_fix.target_sec = new_sec;
8550 /* The target address may have been moved within its section. */
8551 new_offset = offset_with_removed_text (&relax_info->action_list,
8554 new_fix.target_offset = new_offset;
8555 new_fix.target_offset = new_offset;
8556 new_fix.translated = TRUE;
8562 /* Fix up a relocation to take account of removed literals. */
8565 translate_reloc (const r_reloc *orig_rel, r_reloc *new_rel)
8568 xtensa_relax_info *relax_info;
8569 removed_literal *removed;
8570 bfd_vma new_offset, target_offset, removed_bytes;
8572 *new_rel = *orig_rel;
8574 if (!r_reloc_is_defined (orig_rel))
8576 sec = r_reloc_get_section (orig_rel);
8578 relax_info = get_xtensa_relax_info (sec);
8579 BFD_ASSERT (relax_info);
8581 if (!relax_info->is_relaxable_literal_section
8582 && !relax_info->is_relaxable_asm_section)
8585 target_offset = orig_rel->target_offset;
8588 if (is_operand_relocation (ELF32_R_TYPE (orig_rel->rela.r_info)))
8590 /* Check if the original relocation is against a literal being
8592 removed = find_removed_literal (&relax_info->removed_list,
8595 if (removed && removed->to.abfd)
8599 /* The fact that there is still a relocation to this literal indicates
8600 that the literal is being coalesced, not simply removed. */
8601 BFD_ASSERT (removed->to.abfd != NULL);
8603 /* This was moved to some other address
8604 (possibly in another section). */
8605 *new_rel = removed->to;
8606 new_sec = r_reloc_get_section (new_rel);
8610 relax_info = get_xtensa_relax_info (sec);
8612 || (!relax_info->is_relaxable_literal_section
8613 && !relax_info->is_relaxable_asm_section))
8616 target_offset = new_rel->target_offset;
8619 /* ...and the target address may have been moved within its section. */
8620 new_offset = offset_with_removed_text (&relax_info->action_list,
8623 /* Modify the offset and addend. */
8624 removed_bytes = target_offset - new_offset;
8625 new_rel->target_offset = new_offset;
8626 new_rel->rela.r_addend -= removed_bytes;
8630 /* For dynamic links, there may be a dynamic relocation for each
8631 literal. The number of dynamic relocations must be computed in
8632 size_dynamic_sections, which occurs before relaxation. When a
8633 literal is removed, this function checks if there is a corresponding
8634 dynamic relocation and shrinks the size of the appropriate dynamic
8635 relocation section accordingly. At this point, the contents of the
8636 dynamic relocation sections have not yet been filled in, so there's
8637 nothing else that needs to be done. */
8640 shrink_dynamic_reloc_sections (struct bfd_link_info *info,
8642 asection *input_section,
8643 Elf_Internal_Rela *rel)
8645 struct elf_xtensa_link_hash_table *htab;
8646 Elf_Internal_Shdr *symtab_hdr;
8647 struct elf_link_hash_entry **sym_hashes;
8648 unsigned long r_symndx;
8650 struct elf_link_hash_entry *h;
8651 bfd_boolean dynamic_symbol;
8653 htab = elf_xtensa_hash_table (info);
8654 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
8655 sym_hashes = elf_sym_hashes (abfd);
8657 r_type = ELF32_R_TYPE (rel->r_info);
8658 r_symndx = ELF32_R_SYM (rel->r_info);
8660 if (r_symndx < symtab_hdr->sh_info)
8663 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
8665 dynamic_symbol = elf_xtensa_dynamic_symbol_p (h, info);
8667 if ((r_type == R_XTENSA_32 || r_type == R_XTENSA_PLT)
8668 && (input_section->flags & SEC_ALLOC) != 0
8669 && (dynamic_symbol || info->shared))
8672 bfd_boolean is_plt = FALSE;
8674 if (dynamic_symbol && r_type == R_XTENSA_PLT)
8676 srel = htab->srelplt;
8680 srel = htab->srelgot;
8682 /* Reduce size of the .rela.* section by one reloc. */
8683 BFD_ASSERT (srel != NULL);
8684 BFD_ASSERT (srel->size >= sizeof (Elf32_External_Rela));
8685 srel->size -= sizeof (Elf32_External_Rela);
8689 asection *splt, *sgotplt, *srelgot;
8690 int reloc_index, chunk;
8692 /* Find the PLT reloc index of the entry being removed. This
8693 is computed from the size of ".rela.plt". It is needed to
8694 figure out which PLT chunk to resize. Usually "last index
8695 = size - 1" since the index starts at zero, but in this
8696 context, the size has just been decremented so there's no
8697 need to subtract one. */
8698 reloc_index = srel->size / sizeof (Elf32_External_Rela);
8700 chunk = reloc_index / PLT_ENTRIES_PER_CHUNK;
8701 splt = elf_xtensa_get_plt_section (info, chunk);
8702 sgotplt = elf_xtensa_get_gotplt_section (info, chunk);
8703 BFD_ASSERT (splt != NULL && sgotplt != NULL);
8705 /* Check if an entire PLT chunk has just been eliminated. */
8706 if (reloc_index % PLT_ENTRIES_PER_CHUNK == 0)
8708 /* The two magic GOT entries for that chunk can go away. */
8709 srelgot = htab->srelgot;
8710 BFD_ASSERT (srelgot != NULL);
8711 srelgot->reloc_count -= 2;
8712 srelgot->size -= 2 * sizeof (Elf32_External_Rela);
8715 /* There should be only one entry left (and it will be
8717 BFD_ASSERT (sgotplt->size == 4);
8718 BFD_ASSERT (splt->size == PLT_ENTRY_SIZE);
8721 BFD_ASSERT (sgotplt->size >= 4);
8722 BFD_ASSERT (splt->size >= PLT_ENTRY_SIZE);
8725 splt->size -= PLT_ENTRY_SIZE;
8731 /* Take an r_rel and move it to another section. This usually
8732 requires extending the interal_relocation array and pinning it. If
8733 the original r_rel is from the same BFD, we can complete this here.
8734 Otherwise, we add a fix record to let the final link fix the
8735 appropriate address. Contents and internal relocations for the
8736 section must be pinned after calling this routine. */
8739 move_literal (bfd *abfd,
8740 struct bfd_link_info *link_info,
8744 xtensa_relax_info *relax_info,
8745 Elf_Internal_Rela **internal_relocs_p,
8746 const literal_value *lit)
8748 Elf_Internal_Rela *new_relocs = NULL;
8749 size_t new_relocs_count = 0;
8750 Elf_Internal_Rela this_rela;
8751 const r_reloc *r_rel;
8753 r_rel = &lit->r_rel;
8754 BFD_ASSERT (elf_section_data (sec)->relocs == *internal_relocs_p);
8756 if (r_reloc_is_const (r_rel))
8757 bfd_put_32 (abfd, lit->value, contents + offset);
8762 asection *target_sec;
8766 r_type = ELF32_R_TYPE (r_rel->rela.r_info);
8767 target_sec = r_reloc_get_section (r_rel);
8769 /* This is the difficult case. We have to create a fix up. */
8770 this_rela.r_offset = offset;
8771 this_rela.r_info = ELF32_R_INFO (0, r_type);
8772 this_rela.r_addend =
8773 r_rel->target_offset - r_reloc_get_target_offset (r_rel);
8774 bfd_put_32 (abfd, lit->value, contents + offset);
8776 /* Currently, we cannot move relocations during a relocatable link. */
8777 BFD_ASSERT (!link_info->relocatable);
8778 fix = reloc_bfd_fix_init (sec, offset, r_type, r_rel->abfd,
8779 r_reloc_get_section (r_rel),
8780 r_rel->target_offset + r_rel->virtual_offset,
8782 /* We also need to mark that relocations are needed here. */
8783 sec->flags |= SEC_RELOC;
8785 translate_reloc_bfd_fix (fix);
8786 /* This fix has not yet been translated. */
8789 /* Add the relocation. If we have already allocated our own
8790 space for the relocations and we have room for more, then use
8791 it. Otherwise, allocate new space and move the literals. */
8792 insert_at = sec->reloc_count;
8793 for (i = 0; i < sec->reloc_count; ++i)
8795 if (this_rela.r_offset < (*internal_relocs_p)[i].r_offset)
8802 if (*internal_relocs_p != relax_info->allocated_relocs
8803 || sec->reloc_count + 1 > relax_info->allocated_relocs_count)
8805 BFD_ASSERT (relax_info->allocated_relocs == NULL
8806 || sec->reloc_count == relax_info->relocs_count);
8808 if (relax_info->allocated_relocs_count == 0)
8809 new_relocs_count = (sec->reloc_count + 2) * 2;
8811 new_relocs_count = (relax_info->allocated_relocs_count + 2) * 2;
8813 new_relocs = (Elf_Internal_Rela *)
8814 bfd_zmalloc (sizeof (Elf_Internal_Rela) * (new_relocs_count));
8818 /* We could handle this more quickly by finding the split point. */
8820 memcpy (new_relocs, *internal_relocs_p,
8821 insert_at * sizeof (Elf_Internal_Rela));
8823 new_relocs[insert_at] = this_rela;
8825 if (insert_at != sec->reloc_count)
8826 memcpy (new_relocs + insert_at + 1,
8827 (*internal_relocs_p) + insert_at,
8828 (sec->reloc_count - insert_at)
8829 * sizeof (Elf_Internal_Rela));
8831 if (*internal_relocs_p != relax_info->allocated_relocs)
8833 /* The first time we re-allocate, we can only free the
8834 old relocs if they were allocated with bfd_malloc.
8835 This is not true when keep_memory is in effect. */
8836 if (!link_info->keep_memory)
8837 free (*internal_relocs_p);
8840 free (*internal_relocs_p);
8841 relax_info->allocated_relocs = new_relocs;
8842 relax_info->allocated_relocs_count = new_relocs_count;
8843 elf_section_data (sec)->relocs = new_relocs;
8845 relax_info->relocs_count = sec->reloc_count;
8846 *internal_relocs_p = new_relocs;
8850 if (insert_at != sec->reloc_count)
8853 for (idx = sec->reloc_count; idx > insert_at; idx--)
8854 (*internal_relocs_p)[idx] = (*internal_relocs_p)[idx-1];
8856 (*internal_relocs_p)[insert_at] = this_rela;
8858 if (relax_info->allocated_relocs)
8859 relax_info->relocs_count = sec->reloc_count;
8866 /* This is similar to relax_section except that when a target is moved,
8867 we shift addresses up. We also need to modify the size. This
8868 algorithm does NOT allow for relocations into the middle of the
8869 property sections. */
8872 relax_property_section (bfd *abfd,
8874 struct bfd_link_info *link_info)
8876 Elf_Internal_Rela *internal_relocs;
8879 bfd_boolean ok = TRUE;
8880 bfd_boolean is_full_prop_section;
8881 size_t last_zfill_target_offset = 0;
8882 asection *last_zfill_target_sec = NULL;
8883 bfd_size_type sec_size;
8885 sec_size = bfd_get_section_limit (abfd, sec);
8886 internal_relocs = retrieve_internal_relocs (abfd, sec,
8887 link_info->keep_memory);
8888 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
8889 if (contents == NULL && sec_size != 0)
8895 is_full_prop_section =
8896 ( CONST_STRNEQ (sec->name, XTENSA_PROP_SEC_NAME)
8897 || CONST_STRNEQ (sec->name, ".gnu.linkonce.prop."));
8899 if (internal_relocs)
8901 for (i = 0; i < sec->reloc_count; i++)
8903 Elf_Internal_Rela *irel;
8904 xtensa_relax_info *target_relax_info;
8906 asection *target_sec;
8908 bfd_byte *size_p, *flags_p;
8910 /* Locally change the source address.
8911 Translate the target to the new target address.
8912 If it points to this section and has been removed, MOVE IT.
8913 Also, don't forget to modify the associated SIZE at
8916 irel = &internal_relocs[i];
8917 r_type = ELF32_R_TYPE (irel->r_info);
8918 if (r_type == R_XTENSA_NONE)
8921 /* Find the literal value. */
8922 r_reloc_init (&val.r_rel, abfd, irel, contents, sec_size);
8923 size_p = &contents[irel->r_offset + 4];
8925 if (is_full_prop_section)
8927 flags_p = &contents[irel->r_offset + 8];
8928 BFD_ASSERT (irel->r_offset + 12 <= sec_size);
8931 BFD_ASSERT (irel->r_offset + 8 <= sec_size);
8933 target_sec = r_reloc_get_section (&val.r_rel);
8934 target_relax_info = get_xtensa_relax_info (target_sec);
8936 if (target_relax_info
8937 && (target_relax_info->is_relaxable_literal_section
8938 || target_relax_info->is_relaxable_asm_section ))
8940 /* Translate the relocation's destination. */
8941 bfd_vma new_offset, new_end_offset;
8942 long old_size, new_size;
8944 new_offset = offset_with_removed_text
8945 (&target_relax_info->action_list, val.r_rel.target_offset);
8947 /* Assert that we are not out of bounds. */
8948 old_size = bfd_get_32 (abfd, size_p);
8952 /* Only the first zero-sized unreachable entry is
8953 allowed to expand. In this case the new offset
8954 should be the offset before the fill and the new
8955 size is the expansion size. For other zero-sized
8956 entries the resulting size should be zero with an
8957 offset before or after the fill address depending
8958 on whether the expanding unreachable entry
8960 if (last_zfill_target_sec
8961 && last_zfill_target_sec == target_sec
8962 && last_zfill_target_offset == val.r_rel.target_offset)
8963 new_end_offset = new_offset;
8966 new_end_offset = new_offset;
8967 new_offset = offset_with_removed_text_before_fill
8968 (&target_relax_info->action_list,
8969 val.r_rel.target_offset);
8971 /* If it is not unreachable and we have not yet
8972 seen an unreachable at this address, place it
8973 before the fill address. */
8975 || (bfd_get_32 (abfd, flags_p)
8976 & XTENSA_PROP_UNREACHABLE) == 0)
8977 new_end_offset = new_offset;
8980 last_zfill_target_sec = target_sec;
8981 last_zfill_target_offset = val.r_rel.target_offset;
8987 new_end_offset = offset_with_removed_text_before_fill
8988 (&target_relax_info->action_list,
8989 val.r_rel.target_offset + old_size);
8992 new_size = new_end_offset - new_offset;
8994 if (new_size != old_size)
8996 bfd_put_32 (abfd, new_size, size_p);
8997 pin_contents (sec, contents);
9000 if (new_offset != val.r_rel.target_offset)
9002 bfd_vma diff = new_offset - val.r_rel.target_offset;
9003 irel->r_addend += diff;
9004 pin_internal_relocs (sec, internal_relocs);
9010 /* Combine adjacent property table entries. This is also done in
9011 finish_dynamic_sections() but at that point it's too late to
9012 reclaim the space in the output section, so we do this twice. */
9014 if (internal_relocs && (!link_info->relocatable
9015 || strcmp (sec->name, XTENSA_LIT_SEC_NAME) == 0))
9017 Elf_Internal_Rela *last_irel = NULL;
9018 int removed_bytes = 0;
9019 bfd_vma offset, last_irel_offset;
9020 bfd_vma section_size;
9021 bfd_size_type entry_size;
9022 flagword predef_flags;
9024 if (is_full_prop_section)
9029 predef_flags = xtensa_get_property_predef_flags (sec);
9031 /* Walk over memory and irels at the same time.
9032 This REQUIRES that the internal_relocs be sorted by offset. */
9033 qsort (internal_relocs, sec->reloc_count, sizeof (Elf_Internal_Rela),
9034 internal_reloc_compare);
9035 nexti = 0; /* Index into internal_relocs. */
9037 pin_internal_relocs (sec, internal_relocs);
9038 pin_contents (sec, contents);
9040 last_irel_offset = (bfd_vma) -1;
9041 section_size = sec->size;
9042 BFD_ASSERT (section_size % entry_size == 0);
9044 for (offset = 0; offset < section_size; offset += entry_size)
9046 Elf_Internal_Rela *irel, *next_irel;
9047 bfd_vma bytes_to_remove, size, actual_offset;
9048 bfd_boolean remove_this_irel;
9054 /* Find the next two relocations (if there are that many left),
9055 skipping over any R_XTENSA_NONE relocs. On entry, "nexti" is
9056 the starting reloc index. After these two loops, "i"
9057 is the index of the first non-NONE reloc past that starting
9058 index, and "nexti" is the index for the next non-NONE reloc
9061 for (i = nexti; i < sec->reloc_count; i++)
9063 if (ELF32_R_TYPE (internal_relocs[i].r_info) != R_XTENSA_NONE)
9065 irel = &internal_relocs[i];
9068 internal_relocs[i].r_offset -= removed_bytes;
9071 for (nexti = i + 1; nexti < sec->reloc_count; nexti++)
9073 if (ELF32_R_TYPE (internal_relocs[nexti].r_info)
9076 next_irel = &internal_relocs[nexti];
9079 internal_relocs[nexti].r_offset -= removed_bytes;
9082 remove_this_irel = FALSE;
9083 bytes_to_remove = 0;
9084 actual_offset = offset - removed_bytes;
9085 size = bfd_get_32 (abfd, &contents[actual_offset + 4]);
9087 if (is_full_prop_section)
9088 flags = bfd_get_32 (abfd, &contents[actual_offset + 8]);
9090 flags = predef_flags;
9092 /* Check that the irels are sorted by offset,
9093 with only one per address. */
9094 BFD_ASSERT (!irel || (int) irel->r_offset > (int) last_irel_offset);
9095 BFD_ASSERT (!next_irel || next_irel->r_offset > irel->r_offset);
9097 /* Make sure there aren't relocs on the size or flag fields. */
9098 if ((irel && irel->r_offset == offset + 4)
9099 || (is_full_prop_section
9100 && irel && irel->r_offset == offset + 8))
9102 irel->r_offset -= removed_bytes;
9103 last_irel_offset = irel->r_offset;
9105 else if (next_irel && (next_irel->r_offset == offset + 4
9106 || (is_full_prop_section
9107 && next_irel->r_offset == offset + 8)))
9110 irel->r_offset -= removed_bytes;
9111 next_irel->r_offset -= removed_bytes;
9112 last_irel_offset = next_irel->r_offset;
9114 else if (size == 0 && (flags & XTENSA_PROP_ALIGN) == 0
9115 && (flags & XTENSA_PROP_UNREACHABLE) == 0)
9117 /* Always remove entries with zero size and no alignment. */
9118 bytes_to_remove = entry_size;
9119 if (irel && irel->r_offset == offset)
9121 remove_this_irel = TRUE;
9123 irel->r_offset -= removed_bytes;
9124 last_irel_offset = irel->r_offset;
9127 else if (irel && irel->r_offset == offset)
9129 if (ELF32_R_TYPE (irel->r_info) == R_XTENSA_32)
9135 bfd_get_32 (abfd, &contents[last_irel->r_offset + 4]);
9136 bfd_vma old_address =
9137 (last_irel->r_addend
9138 + bfd_get_32 (abfd, &contents[last_irel->r_offset]));
9139 bfd_vma new_address =
9141 + bfd_get_32 (abfd, &contents[actual_offset]));
9142 if (is_full_prop_section)
9143 old_flags = bfd_get_32
9144 (abfd, &contents[last_irel->r_offset + 8]);
9146 old_flags = predef_flags;
9148 if ((ELF32_R_SYM (irel->r_info)
9149 == ELF32_R_SYM (last_irel->r_info))
9150 && old_address + old_size == new_address
9151 && old_flags == flags
9152 && (old_flags & XTENSA_PROP_INSN_BRANCH_TARGET) == 0
9153 && (old_flags & XTENSA_PROP_INSN_LOOP_TARGET) == 0)
9155 /* Fix the old size. */
9156 bfd_put_32 (abfd, old_size + size,
9157 &contents[last_irel->r_offset + 4]);
9158 bytes_to_remove = entry_size;
9159 remove_this_irel = TRUE;
9168 irel->r_offset -= removed_bytes;
9169 last_irel_offset = irel->r_offset;
9172 if (remove_this_irel)
9174 irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
9175 irel->r_offset -= bytes_to_remove;
9178 if (bytes_to_remove != 0)
9180 removed_bytes += bytes_to_remove;
9181 if (offset + bytes_to_remove < section_size)
9182 memmove (&contents[actual_offset],
9183 &contents[actual_offset + bytes_to_remove],
9184 section_size - offset - bytes_to_remove);
9190 /* Clear the removed bytes. */
9191 memset (&contents[section_size - removed_bytes], 0, removed_bytes);
9193 sec->size = section_size - removed_bytes;
9195 if (xtensa_is_littable_section (sec))
9197 asection *sgotloc = elf_xtensa_hash_table (link_info)->sgotloc;
9199 sgotloc->size -= removed_bytes;
9205 release_internal_relocs (sec, internal_relocs);
9206 release_contents (sec, contents);
9211 /* Third relaxation pass. */
9213 /* Change symbol values to account for removed literals. */
9216 relax_section_symbols (bfd *abfd, asection *sec)
9218 xtensa_relax_info *relax_info;
9219 unsigned int sec_shndx;
9220 Elf_Internal_Shdr *symtab_hdr;
9221 Elf_Internal_Sym *isymbuf;
9222 unsigned i, num_syms, num_locals;
9224 relax_info = get_xtensa_relax_info (sec);
9225 BFD_ASSERT (relax_info);
9227 if (!relax_info->is_relaxable_literal_section
9228 && !relax_info->is_relaxable_asm_section)
9231 sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
9233 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
9234 isymbuf = retrieve_local_syms (abfd);
9236 num_syms = symtab_hdr->sh_size / sizeof (Elf32_External_Sym);
9237 num_locals = symtab_hdr->sh_info;
9239 /* Adjust the local symbols defined in this section. */
9240 for (i = 0; i < num_locals; i++)
9242 Elf_Internal_Sym *isym = &isymbuf[i];
9244 if (isym->st_shndx == sec_shndx)
9246 bfd_vma new_address = offset_with_removed_text
9247 (&relax_info->action_list, isym->st_value);
9248 bfd_vma new_size = isym->st_size;
9250 if (ELF32_ST_TYPE (isym->st_info) == STT_FUNC)
9252 bfd_vma new_end = offset_with_removed_text
9253 (&relax_info->action_list, isym->st_value + isym->st_size);
9254 new_size = new_end - new_address;
9257 isym->st_value = new_address;
9258 isym->st_size = new_size;
9262 /* Now adjust the global symbols defined in this section. */
9263 for (i = 0; i < (num_syms - num_locals); i++)
9265 struct elf_link_hash_entry *sym_hash;
9267 sym_hash = elf_sym_hashes (abfd)[i];
9269 if (sym_hash->root.type == bfd_link_hash_warning)
9270 sym_hash = (struct elf_link_hash_entry *) sym_hash->root.u.i.link;
9272 if ((sym_hash->root.type == bfd_link_hash_defined
9273 || sym_hash->root.type == bfd_link_hash_defweak)
9274 && sym_hash->root.u.def.section == sec)
9276 bfd_vma new_address = offset_with_removed_text
9277 (&relax_info->action_list, sym_hash->root.u.def.value);
9278 bfd_vma new_size = sym_hash->size;
9280 if (sym_hash->type == STT_FUNC)
9282 bfd_vma new_end = offset_with_removed_text
9283 (&relax_info->action_list,
9284 sym_hash->root.u.def.value + sym_hash->size);
9285 new_size = new_end - new_address;
9288 sym_hash->root.u.def.value = new_address;
9289 sym_hash->size = new_size;
9297 /* "Fix" handling functions, called while performing relocations. */
9300 do_fix_for_relocatable_link (Elf_Internal_Rela *rel,
9302 asection *input_section,
9306 asection *sec, *old_sec;
9308 int r_type = ELF32_R_TYPE (rel->r_info);
9311 if (r_type == R_XTENSA_NONE)
9314 fix = get_bfd_fix (input_section, rel->r_offset, r_type);
9318 r_reloc_init (&r_rel, input_bfd, rel, contents,
9319 bfd_get_section_limit (input_bfd, input_section));
9320 old_sec = r_reloc_get_section (&r_rel);
9321 old_offset = r_rel.target_offset;
9323 if (!old_sec || !r_reloc_is_defined (&r_rel))
9325 if (r_type != R_XTENSA_ASM_EXPAND)
9327 (*_bfd_error_handler)
9328 (_("%B(%A+0x%lx): unexpected fix for %s relocation"),
9329 input_bfd, input_section, rel->r_offset,
9330 elf_howto_table[r_type].name);
9333 /* Leave it be. Resolution will happen in a later stage. */
9337 sec = fix->target_sec;
9338 rel->r_addend += ((sec->output_offset + fix->target_offset)
9339 - (old_sec->output_offset + old_offset));
9346 do_fix_for_final_link (Elf_Internal_Rela *rel,
9348 asection *input_section,
9350 bfd_vma *relocationp)
9353 int r_type = ELF32_R_TYPE (rel->r_info);
9357 if (r_type == R_XTENSA_NONE)
9360 fix = get_bfd_fix (input_section, rel->r_offset, r_type);
9364 sec = fix->target_sec;
9366 fixup_diff = rel->r_addend;
9367 if (elf_howto_table[fix->src_type].partial_inplace)
9369 bfd_vma inplace_val;
9370 BFD_ASSERT (fix->src_offset
9371 < bfd_get_section_limit (input_bfd, input_section));
9372 inplace_val = bfd_get_32 (input_bfd, &contents[fix->src_offset]);
9373 fixup_diff += inplace_val;
9376 *relocationp = (sec->output_section->vma
9377 + sec->output_offset
9378 + fix->target_offset - fixup_diff);
9382 /* Miscellaneous utility functions.... */
9385 elf_xtensa_get_plt_section (struct bfd_link_info *info, int chunk)
9387 struct elf_xtensa_link_hash_table *htab;
9393 htab = elf_xtensa_hash_table (info);
9397 dynobj = elf_hash_table (info)->dynobj;
9398 sprintf (plt_name, ".plt.%u", chunk);
9399 return bfd_get_section_by_name (dynobj, plt_name);
9404 elf_xtensa_get_gotplt_section (struct bfd_link_info *info, int chunk)
9406 struct elf_xtensa_link_hash_table *htab;
9412 htab = elf_xtensa_hash_table (info);
9413 return htab->sgotplt;
9416 dynobj = elf_hash_table (info)->dynobj;
9417 sprintf (got_name, ".got.plt.%u", chunk);
9418 return bfd_get_section_by_name (dynobj, got_name);
9422 /* Get the input section for a given symbol index.
9424 . a section symbol, return the section;
9425 . a common symbol, return the common section;
9426 . an undefined symbol, return the undefined section;
9427 . an indirect symbol, follow the links;
9428 . an absolute value, return the absolute section. */
9431 get_elf_r_symndx_section (bfd *abfd, unsigned long r_symndx)
9433 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
9434 asection *target_sec = NULL;
9435 if (r_symndx < symtab_hdr->sh_info)
9437 Elf_Internal_Sym *isymbuf;
9438 unsigned int section_index;
9440 isymbuf = retrieve_local_syms (abfd);
9441 section_index = isymbuf[r_symndx].st_shndx;
9443 if (section_index == SHN_UNDEF)
9444 target_sec = bfd_und_section_ptr;
9445 else if (section_index > 0 && section_index < SHN_LORESERVE)
9446 target_sec = bfd_section_from_elf_index (abfd, section_index);
9447 else if (section_index == SHN_ABS)
9448 target_sec = bfd_abs_section_ptr;
9449 else if (section_index == SHN_COMMON)
9450 target_sec = bfd_com_section_ptr;
9457 unsigned long indx = r_symndx - symtab_hdr->sh_info;
9458 struct elf_link_hash_entry *h = elf_sym_hashes (abfd)[indx];
9460 while (h->root.type == bfd_link_hash_indirect
9461 || h->root.type == bfd_link_hash_warning)
9462 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9464 switch (h->root.type)
9466 case bfd_link_hash_defined:
9467 case bfd_link_hash_defweak:
9468 target_sec = h->root.u.def.section;
9470 case bfd_link_hash_common:
9471 target_sec = bfd_com_section_ptr;
9473 case bfd_link_hash_undefined:
9474 case bfd_link_hash_undefweak:
9475 target_sec = bfd_und_section_ptr;
9477 default: /* New indirect warning. */
9478 target_sec = bfd_und_section_ptr;
9486 static struct elf_link_hash_entry *
9487 get_elf_r_symndx_hash_entry (bfd *abfd, unsigned long r_symndx)
9490 struct elf_link_hash_entry *h;
9491 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
9493 if (r_symndx < symtab_hdr->sh_info)
9496 indx = r_symndx - symtab_hdr->sh_info;
9497 h = elf_sym_hashes (abfd)[indx];
9498 while (h->root.type == bfd_link_hash_indirect
9499 || h->root.type == bfd_link_hash_warning)
9500 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9505 /* Get the section-relative offset for a symbol number. */
9508 get_elf_r_symndx_offset (bfd *abfd, unsigned long r_symndx)
9510 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
9513 if (r_symndx < symtab_hdr->sh_info)
9515 Elf_Internal_Sym *isymbuf;
9516 isymbuf = retrieve_local_syms (abfd);
9517 offset = isymbuf[r_symndx].st_value;
9521 unsigned long indx = r_symndx - symtab_hdr->sh_info;
9522 struct elf_link_hash_entry *h =
9523 elf_sym_hashes (abfd)[indx];
9525 while (h->root.type == bfd_link_hash_indirect
9526 || h->root.type == bfd_link_hash_warning)
9527 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9528 if (h->root.type == bfd_link_hash_defined
9529 || h->root.type == bfd_link_hash_defweak)
9530 offset = h->root.u.def.value;
9537 is_reloc_sym_weak (bfd *abfd, Elf_Internal_Rela *rel)
9539 unsigned long r_symndx = ELF32_R_SYM (rel->r_info);
9540 struct elf_link_hash_entry *h;
9542 h = get_elf_r_symndx_hash_entry (abfd, r_symndx);
9543 if (h && h->root.type == bfd_link_hash_defweak)
9550 pcrel_reloc_fits (xtensa_opcode opc,
9552 bfd_vma self_address,
9553 bfd_vma dest_address)
9555 xtensa_isa isa = xtensa_default_isa;
9556 uint32 valp = dest_address;
9557 if (xtensa_operand_do_reloc (isa, opc, opnd, &valp, self_address)
9558 || xtensa_operand_encode (isa, opc, opnd, &valp))
9564 static int linkonce_len = sizeof (".gnu.linkonce.") - 1;
9567 xtensa_is_property_section (asection *sec)
9569 if (CONST_STRNEQ (sec->name, XTENSA_INSN_SEC_NAME)
9570 || CONST_STRNEQ (sec->name, XTENSA_LIT_SEC_NAME)
9571 || CONST_STRNEQ (sec->name, XTENSA_PROP_SEC_NAME))
9574 if (strncmp (".gnu.linkonce.", sec->name, linkonce_len) == 0
9575 && (CONST_STRNEQ (&sec->name[linkonce_len], "x.")
9576 || CONST_STRNEQ (&sec->name[linkonce_len], "p.")
9577 || CONST_STRNEQ (&sec->name[linkonce_len], "prop.")))
9585 xtensa_is_littable_section (asection *sec)
9587 if (CONST_STRNEQ (sec->name, XTENSA_LIT_SEC_NAME))
9590 if (strncmp (".gnu.linkonce.", sec->name, linkonce_len) == 0
9591 && sec->name[linkonce_len] == 'p'
9592 && sec->name[linkonce_len + 1] == '.')
9600 internal_reloc_compare (const void *ap, const void *bp)
9602 const Elf_Internal_Rela *a = (const Elf_Internal_Rela *) ap;
9603 const Elf_Internal_Rela *b = (const Elf_Internal_Rela *) bp;
9605 if (a->r_offset != b->r_offset)
9606 return (a->r_offset - b->r_offset);
9608 /* We don't need to sort on these criteria for correctness,
9609 but enforcing a more strict ordering prevents unstable qsort
9610 from behaving differently with different implementations.
9611 Without the code below we get correct but different results
9612 on Solaris 2.7 and 2.8. We would like to always produce the
9613 same results no matter the host. */
9615 if (a->r_info != b->r_info)
9616 return (a->r_info - b->r_info);
9618 return (a->r_addend - b->r_addend);
9623 internal_reloc_matches (const void *ap, const void *bp)
9625 const Elf_Internal_Rela *a = (const Elf_Internal_Rela *) ap;
9626 const Elf_Internal_Rela *b = (const Elf_Internal_Rela *) bp;
9628 /* Check if one entry overlaps with the other; this shouldn't happen
9629 except when searching for a match. */
9630 return (a->r_offset - b->r_offset);
9634 /* Predicate function used to look up a section in a particular group. */
9637 match_section_group (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, void *inf)
9639 const char *gname = inf;
9640 const char *group_name = elf_group_name (sec);
9642 return (group_name == gname
9643 || (group_name != NULL
9645 && strcmp (group_name, gname) == 0));
9650 xtensa_get_property_section (asection *sec, const char *base_name)
9652 const char *suffix, *group_name;
9653 char *prop_sec_name;
9656 group_name = elf_group_name (sec);
9659 suffix = strrchr (sec->name, '.');
9660 if (suffix == sec->name)
9662 prop_sec_name = (char *) bfd_malloc (strlen (base_name) + 1
9663 + (suffix ? strlen (suffix) : 0));
9664 strcpy (prop_sec_name, base_name);
9666 strcat (prop_sec_name, suffix);
9668 else if (strncmp (sec->name, ".gnu.linkonce.", linkonce_len) == 0)
9670 char *linkonce_kind = 0;
9672 if (strcmp (base_name, XTENSA_INSN_SEC_NAME) == 0)
9673 linkonce_kind = "x.";
9674 else if (strcmp (base_name, XTENSA_LIT_SEC_NAME) == 0)
9675 linkonce_kind = "p.";
9676 else if (strcmp (base_name, XTENSA_PROP_SEC_NAME) == 0)
9677 linkonce_kind = "prop.";
9681 prop_sec_name = (char *) bfd_malloc (strlen (sec->name)
9682 + strlen (linkonce_kind) + 1);
9683 memcpy (prop_sec_name, ".gnu.linkonce.", linkonce_len);
9684 strcpy (prop_sec_name + linkonce_len, linkonce_kind);
9686 suffix = sec->name + linkonce_len;
9687 /* For backward compatibility, replace "t." instead of inserting
9688 the new linkonce_kind (but not for "prop" sections). */
9689 if (CONST_STRNEQ (suffix, "t.") && linkonce_kind[1] == '.')
9691 strcat (prop_sec_name + linkonce_len, suffix);
9694 prop_sec_name = strdup (base_name);
9696 /* Check if the section already exists. */
9697 prop_sec = bfd_get_section_by_name_if (sec->owner, prop_sec_name,
9698 match_section_group,
9699 (void *) group_name);
9700 /* If not, create it. */
9703 flagword flags = (SEC_RELOC | SEC_HAS_CONTENTS | SEC_READONLY);
9704 flags |= (bfd_get_section_flags (sec->owner, sec)
9705 & (SEC_LINK_ONCE | SEC_LINK_DUPLICATES));
9707 prop_sec = bfd_make_section_anyway_with_flags
9708 (sec->owner, strdup (prop_sec_name), flags);
9712 elf_group_name (prop_sec) = group_name;
9715 free (prop_sec_name);
9721 xtensa_get_property_predef_flags (asection *sec)
9723 if (CONST_STRNEQ (sec->name, XTENSA_INSN_SEC_NAME)
9724 || CONST_STRNEQ (sec->name, ".gnu.linkonce.x."))
9725 return (XTENSA_PROP_INSN
9726 | XTENSA_PROP_INSN_NO_TRANSFORM
9727 | XTENSA_PROP_INSN_NO_REORDER);
9729 if (xtensa_is_littable_section (sec))
9730 return (XTENSA_PROP_LITERAL
9731 | XTENSA_PROP_INSN_NO_TRANSFORM
9732 | XTENSA_PROP_INSN_NO_REORDER);
9738 /* Other functions called directly by the linker. */
9741 xtensa_callback_required_dependence (bfd *abfd,
9743 struct bfd_link_info *link_info,
9744 deps_callback_t callback,
9747 Elf_Internal_Rela *internal_relocs;
9750 bfd_boolean ok = TRUE;
9751 bfd_size_type sec_size;
9753 sec_size = bfd_get_section_limit (abfd, sec);
9755 /* ".plt*" sections have no explicit relocations but they contain L32R
9756 instructions that reference the corresponding ".got.plt*" sections. */
9757 if ((sec->flags & SEC_LINKER_CREATED) != 0
9758 && CONST_STRNEQ (sec->name, ".plt"))
9762 /* Find the corresponding ".got.plt*" section. */
9763 if (sec->name[4] == '\0')
9764 sgotplt = bfd_get_section_by_name (sec->owner, ".got.plt");
9770 BFD_ASSERT (sec->name[4] == '.');
9771 chunk = strtol (&sec->name[5], NULL, 10);
9773 sprintf (got_name, ".got.plt.%u", chunk);
9774 sgotplt = bfd_get_section_by_name (sec->owner, got_name);
9776 BFD_ASSERT (sgotplt);
9778 /* Assume worst-case offsets: L32R at the very end of the ".plt"
9779 section referencing a literal at the very beginning of
9780 ".got.plt". This is very close to the real dependence, anyway. */
9781 (*callback) (sec, sec_size, sgotplt, 0, closure);
9784 internal_relocs = retrieve_internal_relocs (abfd, sec,
9785 link_info->keep_memory);
9786 if (internal_relocs == NULL
9787 || sec->reloc_count == 0)
9790 /* Cache the contents for the duration of this scan. */
9791 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
9792 if (contents == NULL && sec_size != 0)
9798 if (!xtensa_default_isa)
9799 xtensa_default_isa = xtensa_isa_init (0, 0);
9801 for (i = 0; i < sec->reloc_count; i++)
9803 Elf_Internal_Rela *irel = &internal_relocs[i];
9804 if (is_l32r_relocation (abfd, sec, contents, irel))
9807 asection *target_sec;
9808 bfd_vma target_offset;
9810 r_reloc_init (&l32r_rel, abfd, irel, contents, sec_size);
9813 /* L32Rs must be local to the input file. */
9814 if (r_reloc_is_defined (&l32r_rel))
9816 target_sec = r_reloc_get_section (&l32r_rel);
9817 target_offset = l32r_rel.target_offset;
9819 (*callback) (sec, irel->r_offset, target_sec, target_offset,
9825 release_internal_relocs (sec, internal_relocs);
9826 release_contents (sec, contents);
9830 /* The default literal sections should always be marked as "code" (i.e.,
9831 SHF_EXECINSTR). This is particularly important for the Linux kernel
9832 module loader so that the literals are not placed after the text. */
9833 static const struct bfd_elf_special_section elf_xtensa_special_sections[] =
9835 { STRING_COMMA_LEN (".fini.literal"), 0, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR },
9836 { STRING_COMMA_LEN (".init.literal"), 0, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR },
9837 { STRING_COMMA_LEN (".literal"), 0, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR },
9838 { STRING_COMMA_LEN (".xtensa.info"), 0, SHT_NOTE, 0 },
9839 { NULL, 0, 0, 0, 0 }
9843 #define TARGET_LITTLE_SYM bfd_elf32_xtensa_le_vec
9844 #define TARGET_LITTLE_NAME "elf32-xtensa-le"
9845 #define TARGET_BIG_SYM bfd_elf32_xtensa_be_vec
9846 #define TARGET_BIG_NAME "elf32-xtensa-be"
9847 #define ELF_ARCH bfd_arch_xtensa
9849 #define ELF_MACHINE_CODE EM_XTENSA
9850 #define ELF_MACHINE_ALT1 EM_XTENSA_OLD
9853 #define ELF_MAXPAGESIZE (1 << XCHAL_MMU_MIN_PTE_PAGE_SIZE)
9854 #else /* !XCHAL_HAVE_MMU */
9855 #define ELF_MAXPAGESIZE 1
9856 #endif /* !XCHAL_HAVE_MMU */
9857 #endif /* ELF_ARCH */
9859 #define elf_backend_can_gc_sections 1
9860 #define elf_backend_can_refcount 1
9861 #define elf_backend_plt_readonly 1
9862 #define elf_backend_got_header_size 4
9863 #define elf_backend_want_dynbss 0
9864 #define elf_backend_want_got_plt 1
9866 #define elf_info_to_howto elf_xtensa_info_to_howto_rela
9868 #define bfd_elf32_bfd_merge_private_bfd_data elf_xtensa_merge_private_bfd_data
9869 #define bfd_elf32_new_section_hook elf_xtensa_new_section_hook
9870 #define bfd_elf32_bfd_print_private_bfd_data elf_xtensa_print_private_bfd_data
9871 #define bfd_elf32_bfd_relax_section elf_xtensa_relax_section
9872 #define bfd_elf32_bfd_reloc_type_lookup elf_xtensa_reloc_type_lookup
9873 #define bfd_elf32_bfd_set_private_flags elf_xtensa_set_private_flags
9874 #define bfd_elf32_bfd_link_hash_table_create elf_xtensa_link_hash_table_create
9876 #define elf_backend_adjust_dynamic_symbol elf_xtensa_adjust_dynamic_symbol
9877 #define elf_backend_check_relocs elf_xtensa_check_relocs
9878 #define elf_backend_create_dynamic_sections elf_xtensa_create_dynamic_sections
9879 #define elf_backend_discard_info elf_xtensa_discard_info
9880 #define elf_backend_ignore_discarded_relocs elf_xtensa_ignore_discarded_relocs
9881 #define elf_backend_final_write_processing elf_xtensa_final_write_processing
9882 #define elf_backend_finish_dynamic_sections elf_xtensa_finish_dynamic_sections
9883 #define elf_backend_finish_dynamic_symbol elf_xtensa_finish_dynamic_symbol
9884 #define elf_backend_gc_mark_hook elf_xtensa_gc_mark_hook
9885 #define elf_backend_gc_sweep_hook elf_xtensa_gc_sweep_hook
9886 #define elf_backend_grok_prstatus elf_xtensa_grok_prstatus
9887 #define elf_backend_grok_psinfo elf_xtensa_grok_psinfo
9888 #define elf_backend_hide_symbol elf_xtensa_hide_symbol
9889 #define elf_backend_object_p elf_xtensa_object_p
9890 #define elf_backend_reloc_type_class elf_xtensa_reloc_type_class
9891 #define elf_backend_relocate_section elf_xtensa_relocate_section
9892 #define elf_backend_size_dynamic_sections elf_xtensa_size_dynamic_sections
9893 #define elf_backend_omit_section_dynsym \
9894 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
9895 #define elf_backend_special_sections elf_xtensa_special_sections
9896 #define elf_backend_action_discarded elf_xtensa_action_discarded
9898 #include "elf32-target.h"