1 /* Xtensa-specific support for 32-bit ELF.
2 Copyright 2003, 2004, 2005 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 (bfd *, int);
39 static char *build_encoding_error_message (xtensa_opcode, bfd_vma);
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 (bfd *, int);
98 static asection *elf_xtensa_get_gotplt_section (bfd *, 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 char *xtensa_get_property_section_name (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 /* Total count of PLT relocations seen during check_relocs.
136 The actual PLT code must be split into multiple sections and all
137 the sections have to be created before size_dynamic_sections,
138 where we figure out the exact number of PLT entries that will be
139 needed. It is OK if this count is an overestimate, e.g., some
140 relocations may be removed by GC. */
142 static int plt_reloc_count = 0;
145 /* The GNU tools do not easily allow extending interfaces to pass around
146 the pointer to the Xtensa ISA information, so instead we add a global
147 variable here (in BFD) that can be used by any of the tools that need
150 xtensa_isa xtensa_default_isa;
153 /* When this is true, relocations may have been modified to refer to
154 symbols from other input files. The per-section list of "fix"
155 records needs to be checked when resolving relocations. */
157 static bfd_boolean relaxing_section = FALSE;
159 /* When this is true, during final links, literals that cannot be
160 coalesced and their relocations may be moved to other sections. */
162 int elf32xtensa_no_literal_movement = 1;
165 static reloc_howto_type elf_howto_table[] =
167 HOWTO (R_XTENSA_NONE, 0, 0, 0, FALSE, 0, complain_overflow_dont,
168 bfd_elf_xtensa_reloc, "R_XTENSA_NONE",
169 FALSE, 0x00000000, 0x00000000, FALSE),
170 HOWTO (R_XTENSA_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
171 bfd_elf_xtensa_reloc, "R_XTENSA_32",
172 TRUE, 0xffffffff, 0xffffffff, FALSE),
173 /* Replace a 32-bit value with a value from the runtime linker (only
174 used by linker-generated stub functions). The r_addend value is
175 special: 1 means to substitute a pointer to the runtime linker's
176 dynamic resolver function; 2 means to substitute the link map for
177 the shared object. */
178 HOWTO (R_XTENSA_RTLD, 0, 2, 32, FALSE, 0, complain_overflow_dont,
179 NULL, "R_XTENSA_RTLD",
180 FALSE, 0x00000000, 0x00000000, FALSE),
181 HOWTO (R_XTENSA_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
182 bfd_elf_generic_reloc, "R_XTENSA_GLOB_DAT",
183 FALSE, 0xffffffff, 0xffffffff, FALSE),
184 HOWTO (R_XTENSA_JMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
185 bfd_elf_generic_reloc, "R_XTENSA_JMP_SLOT",
186 FALSE, 0xffffffff, 0xffffffff, FALSE),
187 HOWTO (R_XTENSA_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
188 bfd_elf_generic_reloc, "R_XTENSA_RELATIVE",
189 FALSE, 0xffffffff, 0xffffffff, FALSE),
190 HOWTO (R_XTENSA_PLT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
191 bfd_elf_xtensa_reloc, "R_XTENSA_PLT",
192 FALSE, 0xffffffff, 0xffffffff, FALSE),
194 HOWTO (R_XTENSA_OP0, 0, 0, 0, TRUE, 0, complain_overflow_dont,
195 bfd_elf_xtensa_reloc, "R_XTENSA_OP0",
196 FALSE, 0x00000000, 0x00000000, TRUE),
197 HOWTO (R_XTENSA_OP1, 0, 0, 0, TRUE, 0, complain_overflow_dont,
198 bfd_elf_xtensa_reloc, "R_XTENSA_OP1",
199 FALSE, 0x00000000, 0x00000000, TRUE),
200 HOWTO (R_XTENSA_OP2, 0, 0, 0, TRUE, 0, complain_overflow_dont,
201 bfd_elf_xtensa_reloc, "R_XTENSA_OP2",
202 FALSE, 0x00000000, 0x00000000, TRUE),
203 /* Assembly auto-expansion. */
204 HOWTO (R_XTENSA_ASM_EXPAND, 0, 0, 0, TRUE, 0, complain_overflow_dont,
205 bfd_elf_xtensa_reloc, "R_XTENSA_ASM_EXPAND",
206 FALSE, 0x00000000, 0x00000000, FALSE),
207 /* Relax assembly auto-expansion. */
208 HOWTO (R_XTENSA_ASM_SIMPLIFY, 0, 0, 0, TRUE, 0, complain_overflow_dont,
209 bfd_elf_xtensa_reloc, "R_XTENSA_ASM_SIMPLIFY",
210 FALSE, 0x00000000, 0x00000000, TRUE),
213 /* GNU extension to record C++ vtable hierarchy. */
214 HOWTO (R_XTENSA_GNU_VTINHERIT, 0, 2, 0, FALSE, 0, complain_overflow_dont,
215 NULL, "R_XTENSA_GNU_VTINHERIT",
216 FALSE, 0x00000000, 0x00000000, FALSE),
217 /* GNU extension to record C++ vtable member usage. */
218 HOWTO (R_XTENSA_GNU_VTENTRY, 0, 2, 0, FALSE, 0, complain_overflow_dont,
219 _bfd_elf_rel_vtable_reloc_fn, "R_XTENSA_GNU_VTENTRY",
220 FALSE, 0x00000000, 0x00000000, FALSE),
222 /* Relocations for supporting difference of symbols. */
223 HOWTO (R_XTENSA_DIFF8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
224 bfd_elf_xtensa_reloc, "R_XTENSA_DIFF8",
225 FALSE, 0xffffffff, 0xffffffff, FALSE),
226 HOWTO (R_XTENSA_DIFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
227 bfd_elf_xtensa_reloc, "R_XTENSA_DIFF16",
228 FALSE, 0xffffffff, 0xffffffff, FALSE),
229 HOWTO (R_XTENSA_DIFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
230 bfd_elf_xtensa_reloc, "R_XTENSA_DIFF32",
231 FALSE, 0xffffffff, 0xffffffff, FALSE),
233 /* General immediate operand relocations. */
234 HOWTO (R_XTENSA_SLOT0_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
235 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT0_OP",
236 FALSE, 0x00000000, 0x00000000, TRUE),
237 HOWTO (R_XTENSA_SLOT1_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
238 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT1_OP",
239 FALSE, 0x00000000, 0x00000000, TRUE),
240 HOWTO (R_XTENSA_SLOT2_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
241 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT2_OP",
242 FALSE, 0x00000000, 0x00000000, TRUE),
243 HOWTO (R_XTENSA_SLOT3_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
244 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT3_OP",
245 FALSE, 0x00000000, 0x00000000, TRUE),
246 HOWTO (R_XTENSA_SLOT4_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
247 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT4_OP",
248 FALSE, 0x00000000, 0x00000000, TRUE),
249 HOWTO (R_XTENSA_SLOT5_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
250 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT5_OP",
251 FALSE, 0x00000000, 0x00000000, TRUE),
252 HOWTO (R_XTENSA_SLOT6_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
253 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT6_OP",
254 FALSE, 0x00000000, 0x00000000, TRUE),
255 HOWTO (R_XTENSA_SLOT7_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
256 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT7_OP",
257 FALSE, 0x00000000, 0x00000000, TRUE),
258 HOWTO (R_XTENSA_SLOT8_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
259 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT8_OP",
260 FALSE, 0x00000000, 0x00000000, TRUE),
261 HOWTO (R_XTENSA_SLOT9_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
262 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT9_OP",
263 FALSE, 0x00000000, 0x00000000, TRUE),
264 HOWTO (R_XTENSA_SLOT10_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
265 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT10_OP",
266 FALSE, 0x00000000, 0x00000000, TRUE),
267 HOWTO (R_XTENSA_SLOT11_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
268 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT11_OP",
269 FALSE, 0x00000000, 0x00000000, TRUE),
270 HOWTO (R_XTENSA_SLOT12_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
271 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT12_OP",
272 FALSE, 0x00000000, 0x00000000, TRUE),
273 HOWTO (R_XTENSA_SLOT13_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
274 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT13_OP",
275 FALSE, 0x00000000, 0x00000000, TRUE),
276 HOWTO (R_XTENSA_SLOT14_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
277 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT14_OP",
278 FALSE, 0x00000000, 0x00000000, TRUE),
280 /* "Alternate" relocations. The meaning of these is opcode-specific. */
281 HOWTO (R_XTENSA_SLOT0_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
282 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT0_ALT",
283 FALSE, 0x00000000, 0x00000000, TRUE),
284 HOWTO (R_XTENSA_SLOT1_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
285 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT1_ALT",
286 FALSE, 0x00000000, 0x00000000, TRUE),
287 HOWTO (R_XTENSA_SLOT2_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
288 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT2_ALT",
289 FALSE, 0x00000000, 0x00000000, TRUE),
290 HOWTO (R_XTENSA_SLOT3_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
291 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT3_ALT",
292 FALSE, 0x00000000, 0x00000000, TRUE),
293 HOWTO (R_XTENSA_SLOT4_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
294 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT4_ALT",
295 FALSE, 0x00000000, 0x00000000, TRUE),
296 HOWTO (R_XTENSA_SLOT5_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
297 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT5_ALT",
298 FALSE, 0x00000000, 0x00000000, TRUE),
299 HOWTO (R_XTENSA_SLOT6_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
300 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT6_ALT",
301 FALSE, 0x00000000, 0x00000000, TRUE),
302 HOWTO (R_XTENSA_SLOT7_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
303 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT7_ALT",
304 FALSE, 0x00000000, 0x00000000, TRUE),
305 HOWTO (R_XTENSA_SLOT8_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
306 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT8_ALT",
307 FALSE, 0x00000000, 0x00000000, TRUE),
308 HOWTO (R_XTENSA_SLOT9_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
309 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT9_ALT",
310 FALSE, 0x00000000, 0x00000000, TRUE),
311 HOWTO (R_XTENSA_SLOT10_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
312 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT10_ALT",
313 FALSE, 0x00000000, 0x00000000, TRUE),
314 HOWTO (R_XTENSA_SLOT11_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
315 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT11_ALT",
316 FALSE, 0x00000000, 0x00000000, TRUE),
317 HOWTO (R_XTENSA_SLOT12_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
318 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT12_ALT",
319 FALSE, 0x00000000, 0x00000000, TRUE),
320 HOWTO (R_XTENSA_SLOT13_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
321 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT13_ALT",
322 FALSE, 0x00000000, 0x00000000, TRUE),
323 HOWTO (R_XTENSA_SLOT14_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
324 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT14_ALT",
325 FALSE, 0x00000000, 0x00000000, TRUE)
330 fprintf (stderr, "Xtensa bfd reloc lookup %d (%s)\n", code, str)
335 static reloc_howto_type *
336 elf_xtensa_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
337 bfd_reloc_code_real_type code)
342 TRACE ("BFD_RELOC_NONE");
343 return &elf_howto_table[(unsigned) R_XTENSA_NONE ];
346 TRACE ("BFD_RELOC_32");
347 return &elf_howto_table[(unsigned) R_XTENSA_32 ];
349 case BFD_RELOC_XTENSA_DIFF8:
350 TRACE ("BFD_RELOC_XTENSA_DIFF8");
351 return &elf_howto_table[(unsigned) R_XTENSA_DIFF8 ];
353 case BFD_RELOC_XTENSA_DIFF16:
354 TRACE ("BFD_RELOC_XTENSA_DIFF16");
355 return &elf_howto_table[(unsigned) R_XTENSA_DIFF16 ];
357 case BFD_RELOC_XTENSA_DIFF32:
358 TRACE ("BFD_RELOC_XTENSA_DIFF32");
359 return &elf_howto_table[(unsigned) R_XTENSA_DIFF32 ];
361 case BFD_RELOC_XTENSA_RTLD:
362 TRACE ("BFD_RELOC_XTENSA_RTLD");
363 return &elf_howto_table[(unsigned) R_XTENSA_RTLD ];
365 case BFD_RELOC_XTENSA_GLOB_DAT:
366 TRACE ("BFD_RELOC_XTENSA_GLOB_DAT");
367 return &elf_howto_table[(unsigned) R_XTENSA_GLOB_DAT ];
369 case BFD_RELOC_XTENSA_JMP_SLOT:
370 TRACE ("BFD_RELOC_XTENSA_JMP_SLOT");
371 return &elf_howto_table[(unsigned) R_XTENSA_JMP_SLOT ];
373 case BFD_RELOC_XTENSA_RELATIVE:
374 TRACE ("BFD_RELOC_XTENSA_RELATIVE");
375 return &elf_howto_table[(unsigned) R_XTENSA_RELATIVE ];
377 case BFD_RELOC_XTENSA_PLT:
378 TRACE ("BFD_RELOC_XTENSA_PLT");
379 return &elf_howto_table[(unsigned) R_XTENSA_PLT ];
381 case BFD_RELOC_XTENSA_OP0:
382 TRACE ("BFD_RELOC_XTENSA_OP0");
383 return &elf_howto_table[(unsigned) R_XTENSA_OP0 ];
385 case BFD_RELOC_XTENSA_OP1:
386 TRACE ("BFD_RELOC_XTENSA_OP1");
387 return &elf_howto_table[(unsigned) R_XTENSA_OP1 ];
389 case BFD_RELOC_XTENSA_OP2:
390 TRACE ("BFD_RELOC_XTENSA_OP2");
391 return &elf_howto_table[(unsigned) R_XTENSA_OP2 ];
393 case BFD_RELOC_XTENSA_ASM_EXPAND:
394 TRACE ("BFD_RELOC_XTENSA_ASM_EXPAND");
395 return &elf_howto_table[(unsigned) R_XTENSA_ASM_EXPAND ];
397 case BFD_RELOC_XTENSA_ASM_SIMPLIFY:
398 TRACE ("BFD_RELOC_XTENSA_ASM_SIMPLIFY");
399 return &elf_howto_table[(unsigned) R_XTENSA_ASM_SIMPLIFY ];
401 case BFD_RELOC_VTABLE_INHERIT:
402 TRACE ("BFD_RELOC_VTABLE_INHERIT");
403 return &elf_howto_table[(unsigned) R_XTENSA_GNU_VTINHERIT ];
405 case BFD_RELOC_VTABLE_ENTRY:
406 TRACE ("BFD_RELOC_VTABLE_ENTRY");
407 return &elf_howto_table[(unsigned) R_XTENSA_GNU_VTENTRY ];
410 if (code >= BFD_RELOC_XTENSA_SLOT0_OP
411 && code <= BFD_RELOC_XTENSA_SLOT14_OP)
413 unsigned n = (R_XTENSA_SLOT0_OP +
414 (code - BFD_RELOC_XTENSA_SLOT0_OP));
415 return &elf_howto_table[n];
418 if (code >= BFD_RELOC_XTENSA_SLOT0_ALT
419 && code <= BFD_RELOC_XTENSA_SLOT14_ALT)
421 unsigned n = (R_XTENSA_SLOT0_ALT +
422 (code - BFD_RELOC_XTENSA_SLOT0_ALT));
423 return &elf_howto_table[n];
434 /* Given an ELF "rela" relocation, find the corresponding howto and record
435 it in the BFD internal arelent representation of the relocation. */
438 elf_xtensa_info_to_howto_rela (bfd *abfd ATTRIBUTE_UNUSED,
440 Elf_Internal_Rela *dst)
442 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
444 BFD_ASSERT (r_type < (unsigned int) R_XTENSA_max);
445 cache_ptr->howto = &elf_howto_table[r_type];
449 /* Functions for the Xtensa ELF linker. */
451 /* The name of the dynamic interpreter. This is put in the .interp
454 #define ELF_DYNAMIC_INTERPRETER "/lib/ld.so"
456 /* The size in bytes of an entry in the procedure linkage table.
457 (This does _not_ include the space for the literals associated with
460 #define PLT_ENTRY_SIZE 16
462 /* For _really_ large PLTs, we may need to alternate between literals
463 and code to keep the literals within the 256K range of the L32R
464 instructions in the code. It's unlikely that anyone would ever need
465 such a big PLT, but an arbitrary limit on the PLT size would be bad.
466 Thus, we split the PLT into chunks. Since there's very little
467 overhead (2 extra literals) for each chunk, the chunk size is kept
468 small so that the code for handling multiple chunks get used and
469 tested regularly. With 254 entries, there are 1K of literals for
470 each chunk, and that seems like a nice round number. */
472 #define PLT_ENTRIES_PER_CHUNK 254
474 /* PLT entries are actually used as stub functions for lazy symbol
475 resolution. Once the symbol is resolved, the stub function is never
476 invoked. Note: the 32-byte frame size used here cannot be changed
477 without a corresponding change in the runtime linker. */
479 static const bfd_byte elf_xtensa_be_plt_entry[PLT_ENTRY_SIZE] =
481 0x6c, 0x10, 0x04, /* entry sp, 32 */
482 0x18, 0x00, 0x00, /* l32r a8, [got entry for rtld's resolver] */
483 0x1a, 0x00, 0x00, /* l32r a10, [got entry for rtld's link map] */
484 0x1b, 0x00, 0x00, /* l32r a11, [literal for reloc index] */
485 0x0a, 0x80, 0x00, /* jx a8 */
489 static const bfd_byte elf_xtensa_le_plt_entry[PLT_ENTRY_SIZE] =
491 0x36, 0x41, 0x00, /* entry sp, 32 */
492 0x81, 0x00, 0x00, /* l32r a8, [got entry for rtld's resolver] */
493 0xa1, 0x00, 0x00, /* l32r a10, [got entry for rtld's link map] */
494 0xb1, 0x00, 0x00, /* l32r a11, [literal for reloc index] */
495 0xa0, 0x08, 0x00, /* jx a8 */
500 static inline bfd_boolean
501 xtensa_elf_dynamic_symbol_p (struct elf_link_hash_entry *h,
502 struct bfd_link_info *info)
504 /* Check if we should do dynamic things to this symbol. The
505 "ignore_protected" argument need not be set, because Xtensa code
506 does not require special handling of STV_PROTECTED to make function
507 pointer comparisons work properly. The PLT addresses are never
508 used for function pointers. */
510 return _bfd_elf_dynamic_symbol_p (h, info, 0);
515 property_table_compare (const void *ap, const void *bp)
517 const property_table_entry *a = (const property_table_entry *) ap;
518 const property_table_entry *b = (const property_table_entry *) bp;
520 if (a->address == b->address)
522 if (a->size != b->size)
523 return (a->size - b->size);
525 if ((a->flags & XTENSA_PROP_ALIGN) != (b->flags & XTENSA_PROP_ALIGN))
526 return ((b->flags & XTENSA_PROP_ALIGN)
527 - (a->flags & XTENSA_PROP_ALIGN));
529 if ((a->flags & XTENSA_PROP_ALIGN)
530 && (GET_XTENSA_PROP_ALIGNMENT (a->flags)
531 != GET_XTENSA_PROP_ALIGNMENT (b->flags)))
532 return (GET_XTENSA_PROP_ALIGNMENT (a->flags)
533 - GET_XTENSA_PROP_ALIGNMENT (b->flags));
535 if ((a->flags & XTENSA_PROP_UNREACHABLE)
536 != (b->flags & XTENSA_PROP_UNREACHABLE))
537 return ((b->flags & XTENSA_PROP_UNREACHABLE)
538 - (a->flags & XTENSA_PROP_UNREACHABLE));
540 return (a->flags - b->flags);
543 return (a->address - b->address);
548 property_table_matches (const void *ap, const void *bp)
550 const property_table_entry *a = (const property_table_entry *) ap;
551 const property_table_entry *b = (const property_table_entry *) bp;
553 /* Check if one entry overlaps with the other. */
554 if ((b->address >= a->address && b->address < (a->address + a->size))
555 || (a->address >= b->address && a->address < (b->address + b->size)))
558 return (a->address - b->address);
562 /* Get the literal table or property table entries for the given
563 section. Sets TABLE_P and returns the number of entries. On
564 error, returns a negative value. */
567 xtensa_read_table_entries (bfd *abfd,
569 property_table_entry **table_p,
570 const char *sec_name,
571 bfd_boolean output_addr)
573 asection *table_section;
574 char *table_section_name;
575 bfd_size_type table_size = 0;
576 bfd_byte *table_data;
577 property_table_entry *blocks;
578 int blk, block_count;
579 bfd_size_type num_records;
580 Elf_Internal_Rela *internal_relocs;
581 bfd_vma section_addr;
582 flagword predef_flags;
583 bfd_size_type table_entry_size;
586 || !(section->flags & SEC_ALLOC)
587 || (section->flags & SEC_DEBUGGING))
593 table_section_name = xtensa_get_property_section_name (section, sec_name);
594 table_section = bfd_get_section_by_name (abfd, table_section_name);
595 free (table_section_name);
597 table_size = table_section->size;
605 predef_flags = xtensa_get_property_predef_flags (table_section);
606 table_entry_size = 12;
608 table_entry_size -= 4;
610 num_records = table_size / table_entry_size;
611 table_data = retrieve_contents (abfd, table_section, TRUE);
612 blocks = (property_table_entry *)
613 bfd_malloc (num_records * sizeof (property_table_entry));
617 section_addr = section->output_section->vma + section->output_offset;
619 section_addr = section->vma;
621 /* If the file has not yet been relocated, process the relocations
622 and sort out the table entries that apply to the specified section. */
623 internal_relocs = retrieve_internal_relocs (abfd, table_section, TRUE);
624 if (internal_relocs && !table_section->reloc_done)
628 for (i = 0; i < table_section->reloc_count; i++)
630 Elf_Internal_Rela *rel = &internal_relocs[i];
631 unsigned long r_symndx;
633 if (ELF32_R_TYPE (rel->r_info) == R_XTENSA_NONE)
636 BFD_ASSERT (ELF32_R_TYPE (rel->r_info) == R_XTENSA_32);
637 r_symndx = ELF32_R_SYM (rel->r_info);
639 if (get_elf_r_symndx_section (abfd, r_symndx) == section)
641 bfd_vma sym_off = get_elf_r_symndx_offset (abfd, r_symndx);
642 BFD_ASSERT (sym_off == 0);
643 BFD_ASSERT (rel->r_addend == 0);
644 blocks[block_count].address =
645 (section_addr + sym_off + rel->r_addend
646 + bfd_get_32 (abfd, table_data + rel->r_offset));
647 blocks[block_count].size =
648 bfd_get_32 (abfd, table_data + rel->r_offset + 4);
650 blocks[block_count].flags = predef_flags;
652 blocks[block_count].flags =
653 bfd_get_32 (abfd, table_data + rel->r_offset + 8);
660 /* The file has already been relocated and the addresses are
661 already in the table. */
663 bfd_size_type section_limit = bfd_get_section_limit (abfd, section);
665 for (off = 0; off < table_size; off += table_entry_size)
667 bfd_vma address = bfd_get_32 (abfd, table_data + off);
669 if (address >= section_addr
670 && address < section_addr + section_limit)
672 blocks[block_count].address = address;
673 blocks[block_count].size =
674 bfd_get_32 (abfd, table_data + off + 4);
676 blocks[block_count].flags = predef_flags;
678 blocks[block_count].flags =
679 bfd_get_32 (abfd, table_data + off + 8);
685 release_contents (table_section, table_data);
686 release_internal_relocs (table_section, internal_relocs);
690 /* Now sort them into address order for easy reference. */
691 qsort (blocks, block_count, sizeof (property_table_entry),
692 property_table_compare);
694 /* Check that the table contents are valid. Problems may occur,
695 for example, if an unrelocated object file is stripped. */
696 for (blk = 1; blk < block_count; blk++)
698 /* The only circumstance where two entries may legitimately
699 have the same address is when one of them is a zero-size
700 placeholder to mark a place where fill can be inserted.
701 The zero-size entry should come first. */
702 if (blocks[blk - 1].address == blocks[blk].address &&
703 blocks[blk - 1].size != 0)
705 (*_bfd_error_handler) (_("%B(%A): invalid property table"),
707 bfd_set_error (bfd_error_bad_value);
719 static property_table_entry *
720 elf_xtensa_find_property_entry (property_table_entry *property_table,
721 int property_table_size,
724 property_table_entry entry;
725 property_table_entry *rv;
727 if (property_table_size == 0)
730 entry.address = addr;
734 rv = bsearch (&entry, property_table, property_table_size,
735 sizeof (property_table_entry), property_table_matches);
741 elf_xtensa_in_literal_pool (property_table_entry *lit_table,
745 if (elf_xtensa_find_property_entry (lit_table, lit_table_size, addr))
752 /* Look through the relocs for a section during the first phase, and
753 calculate needed space in the dynamic reloc sections. */
756 elf_xtensa_check_relocs (bfd *abfd,
757 struct bfd_link_info *info,
759 const Elf_Internal_Rela *relocs)
761 Elf_Internal_Shdr *symtab_hdr;
762 struct elf_link_hash_entry **sym_hashes;
763 const Elf_Internal_Rela *rel;
764 const Elf_Internal_Rela *rel_end;
766 if (info->relocatable)
769 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
770 sym_hashes = elf_sym_hashes (abfd);
772 rel_end = relocs + sec->reloc_count;
773 for (rel = relocs; rel < rel_end; rel++)
776 unsigned long r_symndx;
777 struct elf_link_hash_entry *h;
779 r_symndx = ELF32_R_SYM (rel->r_info);
780 r_type = ELF32_R_TYPE (rel->r_info);
782 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
784 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
789 if (r_symndx < symtab_hdr->sh_info)
793 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
794 while (h->root.type == bfd_link_hash_indirect
795 || h->root.type == bfd_link_hash_warning)
796 h = (struct elf_link_hash_entry *) h->root.u.i.link;
805 if ((sec->flags & SEC_ALLOC) != 0)
807 if (h->got.refcount <= 0)
810 h->got.refcount += 1;
815 /* If this relocation is against a local symbol, then it's
816 exactly the same as a normal local GOT entry. */
820 if ((sec->flags & SEC_ALLOC) != 0)
822 if (h->plt.refcount <= 0)
828 h->plt.refcount += 1;
830 /* Keep track of the total PLT relocation count even if we
831 don't yet know whether the dynamic sections will be
833 plt_reloc_count += 1;
835 if (elf_hash_table (info)->dynamic_sections_created)
837 if (!add_extra_plt_sections (elf_hash_table (info)->dynobj,
845 if ((sec->flags & SEC_ALLOC) != 0)
847 bfd_signed_vma *local_got_refcounts;
849 /* This is a global offset table entry for a local symbol. */
850 local_got_refcounts = elf_local_got_refcounts (abfd);
851 if (local_got_refcounts == NULL)
855 size = symtab_hdr->sh_info;
856 size *= sizeof (bfd_signed_vma);
857 local_got_refcounts =
858 (bfd_signed_vma *) bfd_zalloc (abfd, size);
859 if (local_got_refcounts == NULL)
861 elf_local_got_refcounts (abfd) = local_got_refcounts;
863 local_got_refcounts[r_symndx] += 1;
870 case R_XTENSA_SLOT0_OP:
871 case R_XTENSA_SLOT1_OP:
872 case R_XTENSA_SLOT2_OP:
873 case R_XTENSA_SLOT3_OP:
874 case R_XTENSA_SLOT4_OP:
875 case R_XTENSA_SLOT5_OP:
876 case R_XTENSA_SLOT6_OP:
877 case R_XTENSA_SLOT7_OP:
878 case R_XTENSA_SLOT8_OP:
879 case R_XTENSA_SLOT9_OP:
880 case R_XTENSA_SLOT10_OP:
881 case R_XTENSA_SLOT11_OP:
882 case R_XTENSA_SLOT12_OP:
883 case R_XTENSA_SLOT13_OP:
884 case R_XTENSA_SLOT14_OP:
885 case R_XTENSA_SLOT0_ALT:
886 case R_XTENSA_SLOT1_ALT:
887 case R_XTENSA_SLOT2_ALT:
888 case R_XTENSA_SLOT3_ALT:
889 case R_XTENSA_SLOT4_ALT:
890 case R_XTENSA_SLOT5_ALT:
891 case R_XTENSA_SLOT6_ALT:
892 case R_XTENSA_SLOT7_ALT:
893 case R_XTENSA_SLOT8_ALT:
894 case R_XTENSA_SLOT9_ALT:
895 case R_XTENSA_SLOT10_ALT:
896 case R_XTENSA_SLOT11_ALT:
897 case R_XTENSA_SLOT12_ALT:
898 case R_XTENSA_SLOT13_ALT:
899 case R_XTENSA_SLOT14_ALT:
900 case R_XTENSA_ASM_EXPAND:
901 case R_XTENSA_ASM_SIMPLIFY:
903 case R_XTENSA_DIFF16:
904 case R_XTENSA_DIFF32:
905 /* Nothing to do for these. */
908 case R_XTENSA_GNU_VTINHERIT:
909 /* This relocation describes the C++ object vtable hierarchy.
910 Reconstruct it for later use during GC. */
911 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
915 case R_XTENSA_GNU_VTENTRY:
916 /* This relocation describes which C++ vtable entries are actually
917 used. Record for later use during GC. */
918 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
932 elf_xtensa_make_sym_local (struct bfd_link_info *info,
933 struct elf_link_hash_entry *h)
937 if (h->plt.refcount > 0)
939 /* Will use RELATIVE relocs instead of JMP_SLOT relocs. */
940 if (h->got.refcount < 0)
942 h->got.refcount += h->plt.refcount;
948 /* Don't need any dynamic relocations at all. */
956 elf_xtensa_hide_symbol (struct bfd_link_info *info,
957 struct elf_link_hash_entry *h,
958 bfd_boolean force_local)
960 /* For a shared link, move the plt refcount to the got refcount to leave
961 space for RELATIVE relocs. */
962 elf_xtensa_make_sym_local (info, h);
964 _bfd_elf_link_hash_hide_symbol (info, h, force_local);
968 /* Return the section that should be marked against GC for a given
972 elf_xtensa_gc_mark_hook (asection *sec,
973 struct bfd_link_info *info ATTRIBUTE_UNUSED,
974 Elf_Internal_Rela *rel,
975 struct elf_link_hash_entry *h,
976 Elf_Internal_Sym *sym)
980 switch (ELF32_R_TYPE (rel->r_info))
982 case R_XTENSA_GNU_VTINHERIT:
983 case R_XTENSA_GNU_VTENTRY:
987 switch (h->root.type)
989 case bfd_link_hash_defined:
990 case bfd_link_hash_defweak:
991 return h->root.u.def.section;
993 case bfd_link_hash_common:
994 return h->root.u.c.p->section;
1002 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
1008 /* Update the GOT & PLT entry reference counts
1009 for the section being removed. */
1012 elf_xtensa_gc_sweep_hook (bfd *abfd,
1013 struct bfd_link_info *info ATTRIBUTE_UNUSED,
1015 const Elf_Internal_Rela *relocs)
1017 Elf_Internal_Shdr *symtab_hdr;
1018 struct elf_link_hash_entry **sym_hashes;
1019 bfd_signed_vma *local_got_refcounts;
1020 const Elf_Internal_Rela *rel, *relend;
1022 if ((sec->flags & SEC_ALLOC) == 0)
1025 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1026 sym_hashes = elf_sym_hashes (abfd);
1027 local_got_refcounts = elf_local_got_refcounts (abfd);
1029 relend = relocs + sec->reloc_count;
1030 for (rel = relocs; rel < relend; rel++)
1032 unsigned long r_symndx;
1033 unsigned int r_type;
1034 struct elf_link_hash_entry *h = NULL;
1036 r_symndx = ELF32_R_SYM (rel->r_info);
1037 if (r_symndx >= symtab_hdr->sh_info)
1039 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1040 while (h->root.type == bfd_link_hash_indirect
1041 || h->root.type == bfd_link_hash_warning)
1042 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1045 r_type = ELF32_R_TYPE (rel->r_info);
1051 if (h->got.refcount > 0)
1058 if (h->plt.refcount > 0)
1063 if (local_got_refcounts[r_symndx] > 0)
1064 local_got_refcounts[r_symndx] -= 1;
1076 /* Create all the dynamic sections. */
1079 elf_xtensa_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
1081 flagword flags, noalloc_flags;
1084 /* First do all the standard stuff. */
1085 if (! _bfd_elf_create_dynamic_sections (dynobj, info))
1088 /* Create any extra PLT sections in case check_relocs has already
1089 been called on all the non-dynamic input files. */
1090 if (!add_extra_plt_sections (dynobj, plt_reloc_count))
1093 noalloc_flags = (SEC_HAS_CONTENTS | SEC_IN_MEMORY
1094 | SEC_LINKER_CREATED | SEC_READONLY);
1095 flags = noalloc_flags | SEC_ALLOC | SEC_LOAD;
1097 /* Mark the ".got.plt" section READONLY. */
1098 s = bfd_get_section_by_name (dynobj, ".got.plt");
1100 || ! bfd_set_section_flags (dynobj, s, flags))
1103 /* Create ".rela.got". */
1104 s = bfd_make_section_with_flags (dynobj, ".rela.got", flags);
1106 || ! bfd_set_section_alignment (dynobj, s, 2))
1109 /* Create ".got.loc" (literal tables for use by dynamic linker). */
1110 s = bfd_make_section_with_flags (dynobj, ".got.loc", flags);
1112 || ! bfd_set_section_alignment (dynobj, s, 2))
1115 /* Create ".xt.lit.plt" (literal table for ".got.plt*"). */
1116 s = bfd_make_section_with_flags (dynobj, ".xt.lit.plt",
1119 || ! bfd_set_section_alignment (dynobj, s, 2))
1127 add_extra_plt_sections (bfd *dynobj, int count)
1131 /* Iterate over all chunks except 0 which uses the standard ".plt" and
1132 ".got.plt" sections. */
1133 for (chunk = count / PLT_ENTRIES_PER_CHUNK; chunk > 0; chunk--)
1139 /* Stop when we find a section has already been created. */
1140 if (elf_xtensa_get_plt_section (dynobj, chunk))
1143 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1144 | SEC_LINKER_CREATED | SEC_READONLY);
1146 sname = (char *) bfd_malloc (10);
1147 sprintf (sname, ".plt.%u", chunk);
1148 s = bfd_make_section_with_flags (dynobj, sname,
1151 || ! bfd_set_section_alignment (dynobj, s, 2))
1154 sname = (char *) bfd_malloc (14);
1155 sprintf (sname, ".got.plt.%u", chunk);
1156 s = bfd_make_section_with_flags (dynobj, sname, flags);
1158 || ! bfd_set_section_alignment (dynobj, s, 2))
1166 /* Adjust a symbol defined by a dynamic object and referenced by a
1167 regular object. The current definition is in some section of the
1168 dynamic object, but we're not including those sections. We have to
1169 change the definition to something the rest of the link can
1173 elf_xtensa_adjust_dynamic_symbol (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1174 struct elf_link_hash_entry *h)
1176 /* If this is a weak symbol, and there is a real definition, the
1177 processor independent code will have arranged for us to see the
1178 real definition first, and we can just use the same value. */
1181 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1182 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1183 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1184 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1188 /* This is a reference to a symbol defined by a dynamic object. The
1189 reference must go through the GOT, so there's no need for COPY relocs,
1197 elf_xtensa_fix_refcounts (struct elf_link_hash_entry *h, void *arg)
1199 struct bfd_link_info *info = (struct bfd_link_info *) arg;
1201 if (h->root.type == bfd_link_hash_warning)
1202 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1204 if (! xtensa_elf_dynamic_symbol_p (h, info))
1205 elf_xtensa_make_sym_local (info, h);
1212 elf_xtensa_allocate_plt_size (struct elf_link_hash_entry *h, void *arg)
1214 asection *srelplt = (asection *) arg;
1216 if (h->root.type == bfd_link_hash_warning)
1217 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1219 if (h->plt.refcount > 0)
1220 srelplt->size += (h->plt.refcount * sizeof (Elf32_External_Rela));
1227 elf_xtensa_allocate_got_size (struct elf_link_hash_entry *h, void *arg)
1229 asection *srelgot = (asection *) arg;
1231 if (h->root.type == bfd_link_hash_warning)
1232 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1234 if (h->got.refcount > 0)
1235 srelgot->size += (h->got.refcount * sizeof (Elf32_External_Rela));
1242 elf_xtensa_allocate_local_got_size (struct bfd_link_info *info,
1247 for (i = info->input_bfds; i; i = i->link_next)
1249 bfd_signed_vma *local_got_refcounts;
1250 bfd_size_type j, cnt;
1251 Elf_Internal_Shdr *symtab_hdr;
1253 local_got_refcounts = elf_local_got_refcounts (i);
1254 if (!local_got_refcounts)
1257 symtab_hdr = &elf_tdata (i)->symtab_hdr;
1258 cnt = symtab_hdr->sh_info;
1260 for (j = 0; j < cnt; ++j)
1262 if (local_got_refcounts[j] > 0)
1263 srelgot->size += (local_got_refcounts[j]
1264 * sizeof (Elf32_External_Rela));
1270 /* Set the sizes of the dynamic sections. */
1273 elf_xtensa_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
1274 struct bfd_link_info *info)
1277 asection *s, *srelplt, *splt, *sgotplt, *srelgot, *spltlittbl, *sgotloc;
1278 bfd_boolean relplt, relgot;
1279 int plt_entries, plt_chunks, chunk;
1285 dynobj = elf_hash_table (info)->dynobj;
1289 if (elf_hash_table (info)->dynamic_sections_created)
1291 /* Set the contents of the .interp section to the interpreter. */
1292 if (info->executable)
1294 s = bfd_get_section_by_name (dynobj, ".interp");
1297 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
1298 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1301 /* Allocate room for one word in ".got". */
1302 s = bfd_get_section_by_name (dynobj, ".got");
1307 /* Adjust refcounts for symbols that we now know are not "dynamic". */
1308 elf_link_hash_traverse (elf_hash_table (info),
1309 elf_xtensa_fix_refcounts,
1312 /* Allocate space in ".rela.got" for literals that reference
1314 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
1315 if (srelgot == NULL)
1317 elf_link_hash_traverse (elf_hash_table (info),
1318 elf_xtensa_allocate_got_size,
1321 /* If we are generating a shared object, we also need space in
1322 ".rela.got" for R_XTENSA_RELATIVE relocs for literals that
1323 reference local symbols. */
1325 elf_xtensa_allocate_local_got_size (info, srelgot);
1327 /* Allocate space in ".rela.plt" for literals that have PLT entries. */
1328 srelplt = bfd_get_section_by_name (dynobj, ".rela.plt");
1329 if (srelplt == NULL)
1331 elf_link_hash_traverse (elf_hash_table (info),
1332 elf_xtensa_allocate_plt_size,
1335 /* Allocate space in ".plt" to match the size of ".rela.plt". For
1336 each PLT entry, we need the PLT code plus a 4-byte literal.
1337 For each chunk of ".plt", we also need two more 4-byte
1338 literals, two corresponding entries in ".rela.got", and an
1339 8-byte entry in ".xt.lit.plt". */
1340 spltlittbl = bfd_get_section_by_name (dynobj, ".xt.lit.plt");
1341 if (spltlittbl == NULL)
1344 plt_entries = srelplt->size / sizeof (Elf32_External_Rela);
1346 (plt_entries + PLT_ENTRIES_PER_CHUNK - 1) / PLT_ENTRIES_PER_CHUNK;
1348 /* Iterate over all the PLT chunks, including any extra sections
1349 created earlier because the initial count of PLT relocations
1350 was an overestimate. */
1352 (splt = elf_xtensa_get_plt_section (dynobj, chunk)) != NULL;
1357 sgotplt = elf_xtensa_get_gotplt_section (dynobj, chunk);
1358 if (sgotplt == NULL)
1361 if (chunk < plt_chunks - 1)
1362 chunk_entries = PLT_ENTRIES_PER_CHUNK;
1363 else if (chunk == plt_chunks - 1)
1364 chunk_entries = plt_entries - (chunk * PLT_ENTRIES_PER_CHUNK);
1368 if (chunk_entries != 0)
1370 sgotplt->size = 4 * (chunk_entries + 2);
1371 splt->size = PLT_ENTRY_SIZE * chunk_entries;
1372 srelgot->size += 2 * sizeof (Elf32_External_Rela);
1373 spltlittbl->size += 8;
1382 /* Allocate space in ".got.loc" to match the total size of all the
1384 sgotloc = bfd_get_section_by_name (dynobj, ".got.loc");
1385 if (sgotloc == NULL)
1387 sgotloc->size = spltlittbl->size;
1388 for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link_next)
1390 if (abfd->flags & DYNAMIC)
1392 for (s = abfd->sections; s != NULL; s = s->next)
1394 if (! elf_discarded_section (s)
1395 && xtensa_is_littable_section (s)
1397 sgotloc->size += s->size;
1402 /* Allocate memory for dynamic sections. */
1405 for (s = dynobj->sections; s != NULL; s = s->next)
1410 if ((s->flags & SEC_LINKER_CREATED) == 0)
1413 /* It's OK to base decisions on the section name, because none
1414 of the dynobj section names depend upon the input files. */
1415 name = bfd_get_section_name (dynobj, s);
1419 if (strncmp (name, ".rela", 5) == 0)
1421 if (strcmp (name, ".rela.plt") == 0)
1423 else if (strcmp (name, ".rela.got") == 0)
1426 /* We use the reloc_count field as a counter if we need
1427 to copy relocs into the output file. */
1430 else if (strncmp (name, ".plt.", 5) == 0
1431 || strncmp (name, ".got.plt.", 9) == 0)
1435 /* If we don't need this section, strip it from the output
1436 file. We must create the ".plt*" and ".got.plt*"
1437 sections in create_dynamic_sections and/or check_relocs
1438 based on a conservative estimate of the PLT relocation
1439 count, because the sections must be created before the
1440 linker maps input sections to output sections. The
1441 linker does that before size_dynamic_sections, where we
1442 compute the exact size of the PLT, so there may be more
1443 of these sections than are actually needed. */
1447 else if (strcmp (name, ".got") != 0
1448 && strcmp (name, ".plt") != 0
1449 && strcmp (name, ".got.plt") != 0
1450 && strcmp (name, ".xt.lit.plt") != 0
1451 && strcmp (name, ".got.loc") != 0)
1453 /* It's not one of our sections, so don't allocate space. */
1458 s->flags |= SEC_EXCLUDE;
1461 /* Allocate memory for the section contents. */
1462 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
1463 if (s->contents == NULL && s->size != 0)
1468 if (elf_hash_table (info)->dynamic_sections_created)
1470 /* Add the special XTENSA_RTLD relocations now. The offsets won't be
1471 known until finish_dynamic_sections, but we need to get the relocs
1472 in place before they are sorted. */
1473 if (srelgot == NULL)
1475 for (chunk = 0; chunk < plt_chunks; chunk++)
1477 Elf_Internal_Rela irela;
1481 irela.r_info = ELF32_R_INFO (0, R_XTENSA_RTLD);
1484 loc = (srelgot->contents
1485 + srelgot->reloc_count * sizeof (Elf32_External_Rela));
1486 bfd_elf32_swap_reloca_out (output_bfd, &irela, loc);
1487 bfd_elf32_swap_reloca_out (output_bfd, &irela,
1488 loc + sizeof (Elf32_External_Rela));
1489 srelgot->reloc_count += 2;
1492 /* Add some entries to the .dynamic section. We fill in the
1493 values later, in elf_xtensa_finish_dynamic_sections, but we
1494 must add the entries now so that we get the correct size for
1495 the .dynamic section. The DT_DEBUG entry is filled in by the
1496 dynamic linker and used by the debugger. */
1497 #define add_dynamic_entry(TAG, VAL) \
1498 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
1502 if (!add_dynamic_entry (DT_DEBUG, 0))
1508 if (!add_dynamic_entry (DT_PLTGOT, 0)
1509 || !add_dynamic_entry (DT_PLTRELSZ, 0)
1510 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
1511 || !add_dynamic_entry (DT_JMPREL, 0))
1517 if (!add_dynamic_entry (DT_RELA, 0)
1518 || !add_dynamic_entry (DT_RELASZ, 0)
1519 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
1523 if (!add_dynamic_entry (DT_XTENSA_GOT_LOC_OFF, 0)
1524 || !add_dynamic_entry (DT_XTENSA_GOT_LOC_SZ, 0))
1527 #undef add_dynamic_entry
1533 /* Remove any PT_LOAD segments with no allocated sections. Prior to
1534 binutils 2.13, this function used to remove the non-SEC_ALLOC
1535 sections from PT_LOAD segments, but that task has now been moved
1536 into elf.c. We still need this function to remove any empty
1537 segments that result, but there's nothing Xtensa-specific about
1538 this and it probably ought to be moved into elf.c as well. */
1541 elf_xtensa_modify_segment_map (bfd *abfd,
1542 struct bfd_link_info *info ATTRIBUTE_UNUSED)
1544 struct elf_segment_map **m_p;
1546 m_p = &elf_tdata (abfd)->segment_map;
1549 if ((*m_p)->p_type == PT_LOAD && (*m_p)->count == 0)
1550 *m_p = (*m_p)->next;
1552 m_p = &(*m_p)->next;
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 *error_message = build_encoding_error_message (opcode, relocation);
1750 return bfd_reloc_dangerous;
1753 /* Check for calls across 1GB boundaries. */
1754 if (is_direct_call_opcode (opcode)
1755 && is_windowed_call_opcode (opcode))
1757 if ((self_address >> CALL_SEGMENT_BITS)
1758 != (relocation >> CALL_SEGMENT_BITS))
1761 "windowed call crosses 1GB boundary; return may fail";
1762 return bfd_reloc_dangerous;
1766 /* Write the modified instruction back out of the buffer. */
1767 xtensa_format_set_slot (isa, fmt, slot, ibuff, sbuff);
1768 xtensa_insnbuf_to_chars (isa, ibuff, contents + address,
1769 input_size - address);
1770 return bfd_reloc_ok;
1774 static char * ATTRIBUTE_PRINTF(2,4)
1775 vsprint_msg (const char *origmsg, const char *fmt, int arglen, ...)
1777 /* To reduce the size of the memory leak,
1778 we only use a single message buffer. */
1779 static bfd_size_type alloc_size = 0;
1780 static char *message = NULL;
1781 bfd_size_type orig_len, len = 0;
1782 bfd_boolean is_append;
1784 VA_OPEN (ap, arglen);
1785 VA_FIXEDARG (ap, const char *, origmsg);
1787 is_append = (origmsg == message);
1789 orig_len = strlen (origmsg);
1790 len = orig_len + strlen (fmt) + arglen + 20;
1791 if (len > alloc_size)
1793 message = (char *) bfd_realloc (message, len);
1797 memcpy (message, origmsg, orig_len);
1798 vsprintf (message + orig_len, fmt, ap);
1805 build_encoding_error_message (xtensa_opcode opcode, bfd_vma target_address)
1807 const char *opname = xtensa_opcode_name (xtensa_default_isa, opcode);
1810 msg = "cannot encode";
1811 if (is_direct_call_opcode (opcode))
1813 if ((target_address & 0x3) != 0)
1814 msg = "misaligned call target";
1816 msg = "call target out of range";
1818 else if (opcode == get_l32r_opcode ())
1820 if ((target_address & 0x3) != 0)
1821 msg = "misaligned literal target";
1823 msg = "literal target out of range";
1826 return vsprint_msg (opname, ": %s", strlen (msg) + 2, msg);
1830 /* This function is registered as the "special_function" in the
1831 Xtensa howto for handling simplify operations.
1832 bfd_perform_relocation / bfd_install_relocation use it to
1833 perform (install) the specified relocation. Since this replaces the code
1834 in bfd_perform_relocation, it is basically an Xtensa-specific,
1835 stripped-down version of bfd_perform_relocation. */
1837 static bfd_reloc_status_type
1838 bfd_elf_xtensa_reloc (bfd *abfd,
1839 arelent *reloc_entry,
1842 asection *input_section,
1844 char **error_message)
1847 bfd_reloc_status_type flag;
1848 bfd_size_type octets = reloc_entry->address * bfd_octets_per_byte (abfd);
1849 bfd_vma output_base = 0;
1850 reloc_howto_type *howto = reloc_entry->howto;
1851 asection *reloc_target_output_section;
1852 bfd_boolean is_weak_undef;
1854 if (!xtensa_default_isa)
1855 xtensa_default_isa = xtensa_isa_init (0, 0);
1857 /* ELF relocs are against symbols. If we are producing relocatable
1858 output, and the reloc is against an external symbol, the resulting
1859 reloc will also be against the same symbol. In such a case, we
1860 don't want to change anything about the way the reloc is handled,
1861 since it will all be done at final link time. This test is similar
1862 to what bfd_elf_generic_reloc does except that it lets relocs with
1863 howto->partial_inplace go through even if the addend is non-zero.
1864 (The real problem is that partial_inplace is set for XTENSA_32
1865 relocs to begin with, but that's a long story and there's little we
1866 can do about it now....) */
1868 if (output_bfd && (symbol->flags & BSF_SECTION_SYM) == 0)
1870 reloc_entry->address += input_section->output_offset;
1871 return bfd_reloc_ok;
1874 /* Is the address of the relocation really within the section? */
1875 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section))
1876 return bfd_reloc_outofrange;
1878 /* Work out which section the relocation is targeted at and the
1879 initial relocation command value. */
1881 /* Get symbol value. (Common symbols are special.) */
1882 if (bfd_is_com_section (symbol->section))
1885 relocation = symbol->value;
1887 reloc_target_output_section = symbol->section->output_section;
1889 /* Convert input-section-relative symbol value to absolute. */
1890 if ((output_bfd && !howto->partial_inplace)
1891 || reloc_target_output_section == NULL)
1894 output_base = reloc_target_output_section->vma;
1896 relocation += output_base + symbol->section->output_offset;
1898 /* Add in supplied addend. */
1899 relocation += reloc_entry->addend;
1901 /* Here the variable relocation holds the final address of the
1902 symbol we are relocating against, plus any addend. */
1905 if (!howto->partial_inplace)
1907 /* This is a partial relocation, and we want to apply the relocation
1908 to the reloc entry rather than the raw data. Everything except
1909 relocations against section symbols has already been handled
1912 BFD_ASSERT (symbol->flags & BSF_SECTION_SYM);
1913 reloc_entry->addend = relocation;
1914 reloc_entry->address += input_section->output_offset;
1915 return bfd_reloc_ok;
1919 reloc_entry->address += input_section->output_offset;
1920 reloc_entry->addend = 0;
1924 is_weak_undef = (bfd_is_und_section (symbol->section)
1925 && (symbol->flags & BSF_WEAK) != 0);
1926 flag = elf_xtensa_do_reloc (howto, abfd, input_section, relocation,
1927 (bfd_byte *) data, (bfd_vma) octets,
1928 is_weak_undef, error_message);
1930 if (flag == bfd_reloc_dangerous)
1932 /* Add the symbol name to the error message. */
1933 if (! *error_message)
1934 *error_message = "";
1935 *error_message = vsprint_msg (*error_message, ": (%s + 0x%lx)",
1936 strlen (symbol->name) + 17,
1937 symbol->name, reloc_entry->addend);
1944 /* Set up an entry in the procedure linkage table. */
1947 elf_xtensa_create_plt_entry (bfd *dynobj,
1949 unsigned reloc_index)
1951 asection *splt, *sgotplt;
1952 bfd_vma plt_base, got_base;
1953 bfd_vma code_offset, lit_offset;
1956 chunk = reloc_index / PLT_ENTRIES_PER_CHUNK;
1957 splt = elf_xtensa_get_plt_section (dynobj, chunk);
1958 sgotplt = elf_xtensa_get_gotplt_section (dynobj, chunk);
1959 BFD_ASSERT (splt != NULL && sgotplt != NULL);
1961 plt_base = splt->output_section->vma + splt->output_offset;
1962 got_base = sgotplt->output_section->vma + sgotplt->output_offset;
1964 lit_offset = 8 + (reloc_index % PLT_ENTRIES_PER_CHUNK) * 4;
1965 code_offset = (reloc_index % PLT_ENTRIES_PER_CHUNK) * PLT_ENTRY_SIZE;
1967 /* Fill in the literal entry. This is the offset of the dynamic
1968 relocation entry. */
1969 bfd_put_32 (output_bfd, reloc_index * sizeof (Elf32_External_Rela),
1970 sgotplt->contents + lit_offset);
1972 /* Fill in the entry in the procedure linkage table. */
1973 memcpy (splt->contents + code_offset,
1974 (bfd_big_endian (output_bfd)
1975 ? elf_xtensa_be_plt_entry
1976 : elf_xtensa_le_plt_entry),
1978 bfd_put_16 (output_bfd, l32r_offset (got_base + 0,
1979 plt_base + code_offset + 3),
1980 splt->contents + code_offset + 4);
1981 bfd_put_16 (output_bfd, l32r_offset (got_base + 4,
1982 plt_base + code_offset + 6),
1983 splt->contents + code_offset + 7);
1984 bfd_put_16 (output_bfd, l32r_offset (got_base + lit_offset,
1985 plt_base + code_offset + 9),
1986 splt->contents + code_offset + 10);
1988 return plt_base + code_offset;
1992 /* Relocate an Xtensa ELF section. This is invoked by the linker for
1993 both relocatable and final links. */
1996 elf_xtensa_relocate_section (bfd *output_bfd,
1997 struct bfd_link_info *info,
1999 asection *input_section,
2001 Elf_Internal_Rela *relocs,
2002 Elf_Internal_Sym *local_syms,
2003 asection **local_sections)
2005 Elf_Internal_Shdr *symtab_hdr;
2006 Elf_Internal_Rela *rel;
2007 Elf_Internal_Rela *relend;
2008 struct elf_link_hash_entry **sym_hashes;
2009 asection *srelgot, *srelplt;
2011 property_table_entry *lit_table = 0;
2013 char *error_message = NULL;
2014 bfd_size_type input_size;
2016 if (!xtensa_default_isa)
2017 xtensa_default_isa = xtensa_isa_init (0, 0);
2019 dynobj = elf_hash_table (info)->dynobj;
2020 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
2021 sym_hashes = elf_sym_hashes (input_bfd);
2027 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");;
2028 srelplt = bfd_get_section_by_name (dynobj, ".rela.plt");
2031 if (elf_hash_table (info)->dynamic_sections_created)
2033 ltblsize = xtensa_read_table_entries (input_bfd, input_section,
2034 &lit_table, XTENSA_LIT_SEC_NAME,
2040 input_size = bfd_get_section_limit (input_bfd, input_section);
2043 relend = relocs + input_section->reloc_count;
2044 for (; rel < relend; rel++)
2047 reloc_howto_type *howto;
2048 unsigned long r_symndx;
2049 struct elf_link_hash_entry *h;
2050 Elf_Internal_Sym *sym;
2053 bfd_reloc_status_type r;
2054 bfd_boolean is_weak_undef;
2055 bfd_boolean unresolved_reloc;
2058 r_type = ELF32_R_TYPE (rel->r_info);
2059 if (r_type == (int) R_XTENSA_GNU_VTINHERIT
2060 || r_type == (int) R_XTENSA_GNU_VTENTRY)
2063 if (r_type < 0 || r_type >= (int) R_XTENSA_max)
2065 bfd_set_error (bfd_error_bad_value);
2068 howto = &elf_howto_table[r_type];
2070 r_symndx = ELF32_R_SYM (rel->r_info);
2072 if (info->relocatable)
2074 /* This is a relocatable link.
2075 1) If the reloc is against a section symbol, adjust
2076 according to the output section.
2077 2) If there is a new target for this relocation,
2078 the new target will be in the same output section.
2079 We adjust the relocation by the output section
2082 if (relaxing_section)
2084 /* Check if this references a section in another input file. */
2085 if (!do_fix_for_relocatable_link (rel, input_bfd, input_section,
2088 r_type = ELF32_R_TYPE (rel->r_info);
2091 if (r_type == R_XTENSA_ASM_SIMPLIFY)
2093 char *error_message = NULL;
2094 /* Convert ASM_SIMPLIFY into the simpler relocation
2095 so that they never escape a relaxing link. */
2096 r = contract_asm_expansion (contents, input_size, rel,
2098 if (r != bfd_reloc_ok)
2100 if (!((*info->callbacks->reloc_dangerous)
2101 (info, error_message, input_bfd, input_section,
2105 r_type = ELF32_R_TYPE (rel->r_info);
2108 /* This is a relocatable link, so we don't have to change
2109 anything unless the reloc is against a section symbol,
2110 in which case we have to adjust according to where the
2111 section symbol winds up in the output section. */
2112 if (r_symndx < symtab_hdr->sh_info)
2114 sym = local_syms + r_symndx;
2115 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
2117 sec = local_sections[r_symndx];
2118 rel->r_addend += sec->output_offset + sym->st_value;
2122 /* If there is an addend with a partial_inplace howto,
2123 then move the addend to the contents. This is a hack
2124 to work around problems with DWARF in relocatable links
2125 with some previous version of BFD. Now we can't easily get
2126 rid of the hack without breaking backward compatibility.... */
2129 howto = &elf_howto_table[r_type];
2130 if (howto->partial_inplace)
2132 r = elf_xtensa_do_reloc (howto, input_bfd, input_section,
2133 rel->r_addend, contents,
2134 rel->r_offset, FALSE,
2136 if (r != bfd_reloc_ok)
2138 if (!((*info->callbacks->reloc_dangerous)
2139 (info, error_message, input_bfd, input_section,
2147 /* Done with work for relocatable link; continue with next reloc. */
2151 /* This is a final link. */
2156 is_weak_undef = FALSE;
2157 unresolved_reloc = FALSE;
2160 if (howto->partial_inplace)
2162 /* Because R_XTENSA_32 was made partial_inplace to fix some
2163 problems with DWARF info in partial links, there may be
2164 an addend stored in the contents. Take it out of there
2165 and move it back into the addend field of the reloc. */
2166 rel->r_addend += bfd_get_32 (input_bfd, contents + rel->r_offset);
2167 bfd_put_32 (input_bfd, 0, contents + rel->r_offset);
2170 if (r_symndx < symtab_hdr->sh_info)
2172 sym = local_syms + r_symndx;
2173 sec = local_sections[r_symndx];
2174 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
2178 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2179 r_symndx, symtab_hdr, sym_hashes,
2181 unresolved_reloc, warned);
2184 && !unresolved_reloc
2185 && h->root.type == bfd_link_hash_undefweak)
2186 is_weak_undef = TRUE;
2189 if (relaxing_section)
2191 /* Check if this references a section in another input file. */
2192 do_fix_for_final_link (rel, input_bfd, input_section, contents,
2195 /* Update some already cached values. */
2196 r_type = ELF32_R_TYPE (rel->r_info);
2197 howto = &elf_howto_table[r_type];
2200 /* Sanity check the address. */
2201 if (rel->r_offset >= input_size
2202 && ELF32_R_TYPE (rel->r_info) != R_XTENSA_NONE)
2204 (*_bfd_error_handler)
2205 (_("%B(%A+0x%lx): relocation offset out of range (size=0x%x)"),
2206 input_bfd, input_section, rel->r_offset, input_size);
2207 bfd_set_error (bfd_error_bad_value);
2211 /* Generate dynamic relocations. */
2212 if (elf_hash_table (info)->dynamic_sections_created)
2214 bfd_boolean dynamic_symbol = xtensa_elf_dynamic_symbol_p (h, info);
2216 if (dynamic_symbol && is_operand_relocation (r_type))
2218 /* This is an error. The symbol's real value won't be known
2219 until runtime and it's likely to be out of range anyway. */
2220 const char *name = h->root.root.string;
2221 error_message = vsprint_msg ("invalid relocation for dynamic "
2223 strlen (name) + 2, name);
2224 if (!((*info->callbacks->reloc_dangerous)
2225 (info, error_message, input_bfd, input_section,
2229 else if ((r_type == R_XTENSA_32 || r_type == R_XTENSA_PLT)
2230 && (input_section->flags & SEC_ALLOC) != 0
2231 && (dynamic_symbol || info->shared))
2233 Elf_Internal_Rela outrel;
2237 if (dynamic_symbol && r_type == R_XTENSA_PLT)
2242 BFD_ASSERT (srel != NULL);
2245 _bfd_elf_section_offset (output_bfd, info,
2246 input_section, rel->r_offset);
2248 if ((outrel.r_offset | 1) == (bfd_vma) -1)
2249 memset (&outrel, 0, sizeof outrel);
2252 outrel.r_offset += (input_section->output_section->vma
2253 + input_section->output_offset);
2255 /* Complain if the relocation is in a read-only section
2256 and not in a literal pool. */
2257 if ((input_section->flags & SEC_READONLY) != 0
2258 && !elf_xtensa_in_literal_pool (lit_table, ltblsize,
2262 _("dynamic relocation in read-only section");
2263 if (!((*info->callbacks->reloc_dangerous)
2264 (info, error_message, input_bfd, input_section,
2271 outrel.r_addend = rel->r_addend;
2274 if (r_type == R_XTENSA_32)
2277 ELF32_R_INFO (h->dynindx, R_XTENSA_GLOB_DAT);
2280 else /* r_type == R_XTENSA_PLT */
2283 ELF32_R_INFO (h->dynindx, R_XTENSA_JMP_SLOT);
2285 /* Create the PLT entry and set the initial
2286 contents of the literal entry to the address of
2289 elf_xtensa_create_plt_entry (dynobj, output_bfd,
2292 unresolved_reloc = FALSE;
2296 /* Generate a RELATIVE relocation. */
2297 outrel.r_info = ELF32_R_INFO (0, R_XTENSA_RELATIVE);
2298 outrel.r_addend = 0;
2302 loc = (srel->contents
2303 + srel->reloc_count++ * sizeof (Elf32_External_Rela));
2304 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2305 BFD_ASSERT (sizeof (Elf32_External_Rela) * srel->reloc_count
2310 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
2311 because such sections are not SEC_ALLOC and thus ld.so will
2312 not process them. */
2313 if (unresolved_reloc
2314 && !((input_section->flags & SEC_DEBUGGING) != 0
2316 (*_bfd_error_handler)
2317 (_("%B(%A+0x%lx): unresolvable relocation against symbol `%s'"),
2320 (long) rel->r_offset,
2321 h->root.root.string);
2323 /* There's no point in calling bfd_perform_relocation here.
2324 Just go directly to our "special function". */
2325 r = elf_xtensa_do_reloc (howto, input_bfd, input_section,
2326 relocation + rel->r_addend,
2327 contents, rel->r_offset, is_weak_undef,
2330 if (r != bfd_reloc_ok && !warned)
2334 BFD_ASSERT (r == bfd_reloc_dangerous || r == bfd_reloc_other);
2335 BFD_ASSERT (error_message != NULL);
2338 name = h->root.root.string;
2341 name = bfd_elf_string_from_elf_section
2342 (input_bfd, symtab_hdr->sh_link, sym->st_name);
2343 if (name && *name == '\0')
2344 name = bfd_section_name (input_bfd, sec);
2348 if (rel->r_addend == 0)
2349 error_message = vsprint_msg (error_message, ": %s",
2350 strlen (name) + 2, name);
2352 error_message = vsprint_msg (error_message, ": (%s+0x%x)",
2354 name, (int)rel->r_addend);
2357 if (!((*info->callbacks->reloc_dangerous)
2358 (info, error_message, input_bfd, input_section,
2367 input_section->reloc_done = TRUE;
2373 /* Finish up dynamic symbol handling. There's not much to do here since
2374 the PLT and GOT entries are all set up by relocate_section. */
2377 elf_xtensa_finish_dynamic_symbol (bfd *output_bfd ATTRIBUTE_UNUSED,
2378 struct bfd_link_info *info ATTRIBUTE_UNUSED,
2379 struct elf_link_hash_entry *h,
2380 Elf_Internal_Sym *sym)
2385 /* Mark the symbol as undefined, rather than as defined in
2386 the .plt section. Leave the value alone. */
2387 sym->st_shndx = SHN_UNDEF;
2390 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
2391 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
2392 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
2393 sym->st_shndx = SHN_ABS;
2399 /* Combine adjacent literal table entries in the output. Adjacent
2400 entries within each input section may have been removed during
2401 relaxation, but we repeat the process here, even though it's too late
2402 to shrink the output section, because it's important to minimize the
2403 number of literal table entries to reduce the start-up work for the
2404 runtime linker. Returns the number of remaining table entries or -1
2408 elf_xtensa_combine_prop_entries (bfd *output_bfd,
2413 property_table_entry *table;
2414 bfd_size_type section_size, sgotloc_size;
2418 section_size = sxtlit->size;
2419 BFD_ASSERT (section_size % 8 == 0);
2420 num = section_size / 8;
2422 sgotloc_size = sgotloc->size;
2423 if (sgotloc_size != section_size)
2425 (*_bfd_error_handler)
2426 (_("internal inconsistency in size of .got.loc section"));
2430 table = bfd_malloc (num * sizeof (property_table_entry));
2434 /* The ".xt.lit.plt" section has the SEC_IN_MEMORY flag set and this
2435 propagates to the output section, where it doesn't really apply and
2436 where it breaks the following call to bfd_malloc_and_get_section. */
2437 sxtlit->flags &= ~SEC_IN_MEMORY;
2439 if (!bfd_malloc_and_get_section (output_bfd, sxtlit, &contents))
2447 /* There should never be any relocations left at this point, so this
2448 is quite a bit easier than what is done during relaxation. */
2450 /* Copy the raw contents into a property table array and sort it. */
2452 for (n = 0; n < num; n++)
2454 table[n].address = bfd_get_32 (output_bfd, &contents[offset]);
2455 table[n].size = bfd_get_32 (output_bfd, &contents[offset + 4]);
2458 qsort (table, num, sizeof (property_table_entry), property_table_compare);
2460 for (n = 0; n < num; n++)
2462 bfd_boolean remove = FALSE;
2464 if (table[n].size == 0)
2467 (table[n-1].address + table[n-1].size == table[n].address))
2469 table[n-1].size += table[n].size;
2475 for (m = n; m < num - 1; m++)
2477 table[m].address = table[m+1].address;
2478 table[m].size = table[m+1].size;
2486 /* Copy the data back to the raw contents. */
2488 for (n = 0; n < num; n++)
2490 bfd_put_32 (output_bfd, table[n].address, &contents[offset]);
2491 bfd_put_32 (output_bfd, table[n].size, &contents[offset + 4]);
2495 /* Clear the removed bytes. */
2496 if ((bfd_size_type) (num * 8) < section_size)
2497 memset (&contents[num * 8], 0, section_size - num * 8);
2499 if (! bfd_set_section_contents (output_bfd, sxtlit, contents, 0,
2503 /* Copy the contents to ".got.loc". */
2504 memcpy (sgotloc->contents, contents, section_size);
2512 /* Finish up the dynamic sections. */
2515 elf_xtensa_finish_dynamic_sections (bfd *output_bfd,
2516 struct bfd_link_info *info)
2519 asection *sdyn, *srelplt, *sgot, *sxtlit, *sgotloc;
2520 Elf32_External_Dyn *dyncon, *dynconend;
2521 int num_xtlit_entries;
2523 if (! elf_hash_table (info)->dynamic_sections_created)
2526 dynobj = elf_hash_table (info)->dynobj;
2527 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
2528 BFD_ASSERT (sdyn != NULL);
2530 /* Set the first entry in the global offset table to the address of
2531 the dynamic section. */
2532 sgot = bfd_get_section_by_name (dynobj, ".got");
2535 BFD_ASSERT (sgot->size == 4);
2537 bfd_put_32 (output_bfd, 0, sgot->contents);
2539 bfd_put_32 (output_bfd,
2540 sdyn->output_section->vma + sdyn->output_offset,
2544 srelplt = bfd_get_section_by_name (dynobj, ".rela.plt");
2545 if (srelplt && srelplt->size != 0)
2547 asection *sgotplt, *srelgot, *spltlittbl;
2548 int chunk, plt_chunks, plt_entries;
2549 Elf_Internal_Rela irela;
2551 unsigned rtld_reloc;
2553 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");;
2554 BFD_ASSERT (srelgot != NULL);
2556 spltlittbl = bfd_get_section_by_name (dynobj, ".xt.lit.plt");
2557 BFD_ASSERT (spltlittbl != NULL);
2559 /* Find the first XTENSA_RTLD relocation. Presumably the rest
2560 of them follow immediately after.... */
2561 for (rtld_reloc = 0; rtld_reloc < srelgot->reloc_count; rtld_reloc++)
2563 loc = srelgot->contents + rtld_reloc * sizeof (Elf32_External_Rela);
2564 bfd_elf32_swap_reloca_in (output_bfd, loc, &irela);
2565 if (ELF32_R_TYPE (irela.r_info) == R_XTENSA_RTLD)
2568 BFD_ASSERT (rtld_reloc < srelgot->reloc_count);
2570 plt_entries = srelplt->size / sizeof (Elf32_External_Rela);
2572 (plt_entries + PLT_ENTRIES_PER_CHUNK - 1) / PLT_ENTRIES_PER_CHUNK;
2574 for (chunk = 0; chunk < plt_chunks; chunk++)
2576 int chunk_entries = 0;
2578 sgotplt = elf_xtensa_get_gotplt_section (dynobj, chunk);
2579 BFD_ASSERT (sgotplt != NULL);
2581 /* Emit special RTLD relocations for the first two entries in
2582 each chunk of the .got.plt section. */
2584 loc = srelgot->contents + rtld_reloc * sizeof (Elf32_External_Rela);
2585 bfd_elf32_swap_reloca_in (output_bfd, loc, &irela);
2586 BFD_ASSERT (ELF32_R_TYPE (irela.r_info) == R_XTENSA_RTLD);
2587 irela.r_offset = (sgotplt->output_section->vma
2588 + sgotplt->output_offset);
2589 irela.r_addend = 1; /* tell rtld to set value to resolver function */
2590 bfd_elf32_swap_reloca_out (output_bfd, &irela, loc);
2592 BFD_ASSERT (rtld_reloc <= srelgot->reloc_count);
2594 /* Next literal immediately follows the first. */
2595 loc += sizeof (Elf32_External_Rela);
2596 bfd_elf32_swap_reloca_in (output_bfd, loc, &irela);
2597 BFD_ASSERT (ELF32_R_TYPE (irela.r_info) == R_XTENSA_RTLD);
2598 irela.r_offset = (sgotplt->output_section->vma
2599 + sgotplt->output_offset + 4);
2600 /* Tell rtld to set value to object's link map. */
2602 bfd_elf32_swap_reloca_out (output_bfd, &irela, loc);
2604 BFD_ASSERT (rtld_reloc <= srelgot->reloc_count);
2606 /* Fill in the literal table. */
2607 if (chunk < plt_chunks - 1)
2608 chunk_entries = PLT_ENTRIES_PER_CHUNK;
2610 chunk_entries = plt_entries - (chunk * PLT_ENTRIES_PER_CHUNK);
2612 BFD_ASSERT ((unsigned) (chunk + 1) * 8 <= spltlittbl->size);
2613 bfd_put_32 (output_bfd,
2614 sgotplt->output_section->vma + sgotplt->output_offset,
2615 spltlittbl->contents + (chunk * 8) + 0);
2616 bfd_put_32 (output_bfd,
2617 8 + (chunk_entries * 4),
2618 spltlittbl->contents + (chunk * 8) + 4);
2621 /* All the dynamic relocations have been emitted at this point.
2622 Make sure the relocation sections are the correct size. */
2623 if (srelgot->size != (sizeof (Elf32_External_Rela)
2624 * srelgot->reloc_count)
2625 || srelplt->size != (sizeof (Elf32_External_Rela)
2626 * srelplt->reloc_count))
2629 /* The .xt.lit.plt section has just been modified. This must
2630 happen before the code below which combines adjacent literal
2631 table entries, and the .xt.lit.plt contents have to be forced to
2633 if (! bfd_set_section_contents (output_bfd,
2634 spltlittbl->output_section,
2635 spltlittbl->contents,
2636 spltlittbl->output_offset,
2639 /* Clear SEC_HAS_CONTENTS so the contents won't be output again. */
2640 spltlittbl->flags &= ~SEC_HAS_CONTENTS;
2643 /* Combine adjacent literal table entries. */
2644 BFD_ASSERT (! info->relocatable);
2645 sxtlit = bfd_get_section_by_name (output_bfd, ".xt.lit");
2646 sgotloc = bfd_get_section_by_name (dynobj, ".got.loc");
2647 BFD_ASSERT (sxtlit && sgotloc);
2649 elf_xtensa_combine_prop_entries (output_bfd, sxtlit, sgotloc);
2650 if (num_xtlit_entries < 0)
2653 dyncon = (Elf32_External_Dyn *) sdyn->contents;
2654 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
2655 for (; dyncon < dynconend; dyncon++)
2657 Elf_Internal_Dyn dyn;
2661 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
2668 case DT_XTENSA_GOT_LOC_SZ:
2669 dyn.d_un.d_val = num_xtlit_entries;
2672 case DT_XTENSA_GOT_LOC_OFF:
2681 s = bfd_get_section_by_name (output_bfd, name);
2683 dyn.d_un.d_ptr = s->vma;
2687 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2689 dyn.d_un.d_val = s->size;
2693 /* Adjust RELASZ to not include JMPREL. This matches what
2694 glibc expects and what is done for several other ELF
2695 targets (e.g., i386, alpha), but the "correct" behavior
2696 seems to be unresolved. Since the linker script arranges
2697 for .rela.plt to follow all other relocation sections, we
2698 don't have to worry about changing the DT_RELA entry. */
2699 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2701 dyn.d_un.d_val -= s->size;
2705 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2712 /* Functions for dealing with the e_flags field. */
2714 /* Merge backend specific data from an object file to the output
2715 object file when linking. */
2718 elf_xtensa_merge_private_bfd_data (bfd *ibfd, bfd *obfd)
2720 unsigned out_mach, in_mach;
2721 flagword out_flag, in_flag;
2723 /* Check if we have the same endianess. */
2724 if (!_bfd_generic_verify_endian_match (ibfd, obfd))
2727 /* Don't even pretend to support mixed-format linking. */
2728 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
2729 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
2732 out_flag = elf_elfheader (obfd)->e_flags;
2733 in_flag = elf_elfheader (ibfd)->e_flags;
2735 out_mach = out_flag & EF_XTENSA_MACH;
2736 in_mach = in_flag & EF_XTENSA_MACH;
2737 if (out_mach != in_mach)
2739 (*_bfd_error_handler)
2740 (_("%B: incompatible machine type. Output is 0x%x. Input is 0x%x"),
2741 ibfd, out_mach, in_mach);
2742 bfd_set_error (bfd_error_wrong_format);
2746 if (! elf_flags_init (obfd))
2748 elf_flags_init (obfd) = TRUE;
2749 elf_elfheader (obfd)->e_flags = in_flag;
2751 if (bfd_get_arch (obfd) == bfd_get_arch (ibfd)
2752 && bfd_get_arch_info (obfd)->the_default)
2753 return bfd_set_arch_mach (obfd, bfd_get_arch (ibfd),
2754 bfd_get_mach (ibfd));
2759 if ((out_flag & EF_XTENSA_XT_INSN) != (in_flag & EF_XTENSA_XT_INSN))
2760 elf_elfheader (obfd)->e_flags &= (~ EF_XTENSA_XT_INSN);
2762 if ((out_flag & EF_XTENSA_XT_LIT) != (in_flag & EF_XTENSA_XT_LIT))
2763 elf_elfheader (obfd)->e_flags &= (~ EF_XTENSA_XT_LIT);
2770 elf_xtensa_set_private_flags (bfd *abfd, flagword flags)
2772 BFD_ASSERT (!elf_flags_init (abfd)
2773 || elf_elfheader (abfd)->e_flags == flags);
2775 elf_elfheader (abfd)->e_flags |= flags;
2776 elf_flags_init (abfd) = TRUE;
2783 elf_xtensa_print_private_bfd_data (bfd *abfd, void *farg)
2785 FILE *f = (FILE *) farg;
2786 flagword e_flags = elf_elfheader (abfd)->e_flags;
2788 fprintf (f, "\nXtensa header:\n");
2789 if ((e_flags & EF_XTENSA_MACH) == E_XTENSA_MACH)
2790 fprintf (f, "\nMachine = Base\n");
2792 fprintf (f, "\nMachine Id = 0x%x\n", e_flags & EF_XTENSA_MACH);
2794 fprintf (f, "Insn tables = %s\n",
2795 (e_flags & EF_XTENSA_XT_INSN) ? "true" : "false");
2797 fprintf (f, "Literal tables = %s\n",
2798 (e_flags & EF_XTENSA_XT_LIT) ? "true" : "false");
2800 return _bfd_elf_print_private_bfd_data (abfd, farg);
2804 /* Set the right machine number for an Xtensa ELF file. */
2807 elf_xtensa_object_p (bfd *abfd)
2810 unsigned long arch = elf_elfheader (abfd)->e_flags & EF_XTENSA_MACH;
2815 mach = bfd_mach_xtensa;
2821 (void) bfd_default_set_arch_mach (abfd, bfd_arch_xtensa, mach);
2826 /* The final processing done just before writing out an Xtensa ELF object
2827 file. This gets the Xtensa architecture right based on the machine
2831 elf_xtensa_final_write_processing (bfd *abfd,
2832 bfd_boolean linker ATTRIBUTE_UNUSED)
2837 switch (mach = bfd_get_mach (abfd))
2839 case bfd_mach_xtensa:
2840 val = E_XTENSA_MACH;
2846 elf_elfheader (abfd)->e_flags &= (~ EF_XTENSA_MACH);
2847 elf_elfheader (abfd)->e_flags |= val;
2851 static enum elf_reloc_type_class
2852 elf_xtensa_reloc_type_class (const Elf_Internal_Rela *rela)
2854 switch ((int) ELF32_R_TYPE (rela->r_info))
2856 case R_XTENSA_RELATIVE:
2857 return reloc_class_relative;
2858 case R_XTENSA_JMP_SLOT:
2859 return reloc_class_plt;
2861 return reloc_class_normal;
2867 elf_xtensa_discard_info_for_section (bfd *abfd,
2868 struct elf_reloc_cookie *cookie,
2869 struct bfd_link_info *info,
2873 bfd_vma section_size;
2874 bfd_vma offset, actual_offset;
2875 size_t removed_bytes = 0;
2877 section_size = sec->size;
2878 if (section_size == 0 || section_size % 8 != 0)
2881 if (sec->output_section
2882 && bfd_is_abs_section (sec->output_section))
2885 contents = retrieve_contents (abfd, sec, info->keep_memory);
2889 cookie->rels = retrieve_internal_relocs (abfd, sec, info->keep_memory);
2892 release_contents (sec, contents);
2896 cookie->rel = cookie->rels;
2897 cookie->relend = cookie->rels + sec->reloc_count;
2899 for (offset = 0; offset < section_size; offset += 8)
2901 actual_offset = offset - removed_bytes;
2903 /* The ...symbol_deleted_p function will skip over relocs but it
2904 won't adjust their offsets, so do that here. */
2905 while (cookie->rel < cookie->relend
2906 && cookie->rel->r_offset < offset)
2908 cookie->rel->r_offset -= removed_bytes;
2912 while (cookie->rel < cookie->relend
2913 && cookie->rel->r_offset == offset)
2915 if (bfd_elf_reloc_symbol_deleted_p (offset, cookie))
2917 /* Remove the table entry. (If the reloc type is NONE, then
2918 the entry has already been merged with another and deleted
2919 during relaxation.) */
2920 if (ELF32_R_TYPE (cookie->rel->r_info) != R_XTENSA_NONE)
2922 /* Shift the contents up. */
2923 if (offset + 8 < section_size)
2924 memmove (&contents[actual_offset],
2925 &contents[actual_offset+8],
2926 section_size - offset - 8);
2930 /* Remove this relocation. */
2931 cookie->rel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
2934 /* Adjust the relocation offset for previous removals. This
2935 should not be done before calling ...symbol_deleted_p
2936 because it might mess up the offset comparisons there.
2937 Make sure the offset doesn't underflow in the case where
2938 the first entry is removed. */
2939 if (cookie->rel->r_offset >= removed_bytes)
2940 cookie->rel->r_offset -= removed_bytes;
2942 cookie->rel->r_offset = 0;
2948 if (removed_bytes != 0)
2950 /* Adjust any remaining relocs (shouldn't be any). */
2951 for (; cookie->rel < cookie->relend; cookie->rel++)
2953 if (cookie->rel->r_offset >= removed_bytes)
2954 cookie->rel->r_offset -= removed_bytes;
2956 cookie->rel->r_offset = 0;
2959 /* Clear the removed bytes. */
2960 memset (&contents[section_size - removed_bytes], 0, removed_bytes);
2962 pin_contents (sec, contents);
2963 pin_internal_relocs (sec, cookie->rels);
2966 sec->size = section_size - removed_bytes;
2968 if (xtensa_is_littable_section (sec))
2970 bfd *dynobj = elf_hash_table (info)->dynobj;
2974 bfd_get_section_by_name (dynobj, ".got.loc");
2976 sgotloc->size -= removed_bytes;
2982 release_contents (sec, contents);
2983 release_internal_relocs (sec, cookie->rels);
2986 return (removed_bytes != 0);
2991 elf_xtensa_discard_info (bfd *abfd,
2992 struct elf_reloc_cookie *cookie,
2993 struct bfd_link_info *info)
2996 bfd_boolean changed = FALSE;
2998 for (sec = abfd->sections; sec != NULL; sec = sec->next)
3000 if (xtensa_is_property_section (sec))
3002 if (elf_xtensa_discard_info_for_section (abfd, cookie, info, sec))
3012 elf_xtensa_ignore_discarded_relocs (asection *sec)
3014 return xtensa_is_property_section (sec);
3018 /* Support for core dump NOTE sections. */
3021 elf_xtensa_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
3026 /* The size for Xtensa is variable, so don't try to recognize the format
3027 based on the size. Just assume this is GNU/Linux. */
3030 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12);
3033 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24);
3037 size = note->descsz - offset - 4;
3039 /* Make a ".reg/999" section. */
3040 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
3041 size, note->descpos + offset);
3046 elf_xtensa_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
3048 switch (note->descsz)
3053 case 128: /* GNU/Linux elf_prpsinfo */
3054 elf_tdata (abfd)->core_program
3055 = _bfd_elfcore_strndup (abfd, note->descdata + 32, 16);
3056 elf_tdata (abfd)->core_command
3057 = _bfd_elfcore_strndup (abfd, note->descdata + 48, 80);
3060 /* Note that for some reason, a spurious space is tacked
3061 onto the end of the args in some (at least one anyway)
3062 implementations, so strip it off if it exists. */
3065 char *command = elf_tdata (abfd)->core_command;
3066 int n = strlen (command);
3068 if (0 < n && command[n - 1] == ' ')
3069 command[n - 1] = '\0';
3076 /* Generic Xtensa configurability stuff. */
3078 static xtensa_opcode callx0_op = XTENSA_UNDEFINED;
3079 static xtensa_opcode callx4_op = XTENSA_UNDEFINED;
3080 static xtensa_opcode callx8_op = XTENSA_UNDEFINED;
3081 static xtensa_opcode callx12_op = XTENSA_UNDEFINED;
3082 static xtensa_opcode call0_op = XTENSA_UNDEFINED;
3083 static xtensa_opcode call4_op = XTENSA_UNDEFINED;
3084 static xtensa_opcode call8_op = XTENSA_UNDEFINED;
3085 static xtensa_opcode call12_op = XTENSA_UNDEFINED;
3088 init_call_opcodes (void)
3090 if (callx0_op == XTENSA_UNDEFINED)
3092 callx0_op = xtensa_opcode_lookup (xtensa_default_isa, "callx0");
3093 callx4_op = xtensa_opcode_lookup (xtensa_default_isa, "callx4");
3094 callx8_op = xtensa_opcode_lookup (xtensa_default_isa, "callx8");
3095 callx12_op = xtensa_opcode_lookup (xtensa_default_isa, "callx12");
3096 call0_op = xtensa_opcode_lookup (xtensa_default_isa, "call0");
3097 call4_op = xtensa_opcode_lookup (xtensa_default_isa, "call4");
3098 call8_op = xtensa_opcode_lookup (xtensa_default_isa, "call8");
3099 call12_op = xtensa_opcode_lookup (xtensa_default_isa, "call12");
3105 is_indirect_call_opcode (xtensa_opcode opcode)
3107 init_call_opcodes ();
3108 return (opcode == callx0_op
3109 || opcode == callx4_op
3110 || opcode == callx8_op
3111 || opcode == callx12_op);
3116 is_direct_call_opcode (xtensa_opcode opcode)
3118 init_call_opcodes ();
3119 return (opcode == call0_op
3120 || opcode == call4_op
3121 || opcode == call8_op
3122 || opcode == call12_op);
3127 is_windowed_call_opcode (xtensa_opcode opcode)
3129 init_call_opcodes ();
3130 return (opcode == call4_op
3131 || opcode == call8_op
3132 || opcode == call12_op
3133 || opcode == callx4_op
3134 || opcode == callx8_op
3135 || opcode == callx12_op);
3139 static xtensa_opcode
3140 get_const16_opcode (void)
3142 static bfd_boolean done_lookup = FALSE;
3143 static xtensa_opcode const16_opcode = XTENSA_UNDEFINED;
3146 const16_opcode = xtensa_opcode_lookup (xtensa_default_isa, "const16");
3149 return const16_opcode;
3153 static xtensa_opcode
3154 get_l32r_opcode (void)
3156 static xtensa_opcode l32r_opcode = XTENSA_UNDEFINED;
3157 static bfd_boolean done_lookup = FALSE;
3161 l32r_opcode = xtensa_opcode_lookup (xtensa_default_isa, "l32r");
3169 l32r_offset (bfd_vma addr, bfd_vma pc)
3173 offset = addr - ((pc+3) & -4);
3174 BFD_ASSERT ((offset & ((1 << 2) - 1)) == 0);
3175 offset = (signed int) offset >> 2;
3176 BFD_ASSERT ((signed int) offset >> 16 == -1);
3182 get_relocation_opnd (xtensa_opcode opcode, int r_type)
3184 xtensa_isa isa = xtensa_default_isa;
3185 int last_immed, last_opnd, opi;
3187 if (opcode == XTENSA_UNDEFINED)
3188 return XTENSA_UNDEFINED;
3190 /* Find the last visible PC-relative immediate operand for the opcode.
3191 If there are no PC-relative immediates, then choose the last visible
3192 immediate; otherwise, fail and return XTENSA_UNDEFINED. */
3193 last_immed = XTENSA_UNDEFINED;
3194 last_opnd = xtensa_opcode_num_operands (isa, opcode);
3195 for (opi = last_opnd - 1; opi >= 0; opi--)
3197 if (xtensa_operand_is_visible (isa, opcode, opi) == 0)
3199 if (xtensa_operand_is_PCrelative (isa, opcode, opi) == 1)
3204 if (last_immed == XTENSA_UNDEFINED
3205 && xtensa_operand_is_register (isa, opcode, opi) == 0)
3209 return XTENSA_UNDEFINED;
3211 /* If the operand number was specified in an old-style relocation,
3212 check for consistency with the operand computed above. */
3213 if (r_type >= R_XTENSA_OP0 && r_type <= R_XTENSA_OP2)
3215 int reloc_opnd = r_type - R_XTENSA_OP0;
3216 if (reloc_opnd != last_immed)
3217 return XTENSA_UNDEFINED;
3225 get_relocation_slot (int r_type)
3235 if (r_type >= R_XTENSA_SLOT0_OP && r_type <= R_XTENSA_SLOT14_OP)
3236 return r_type - R_XTENSA_SLOT0_OP;
3237 if (r_type >= R_XTENSA_SLOT0_ALT && r_type <= R_XTENSA_SLOT14_ALT)
3238 return r_type - R_XTENSA_SLOT0_ALT;
3242 return XTENSA_UNDEFINED;
3246 /* Get the opcode for a relocation. */
3248 static xtensa_opcode
3249 get_relocation_opcode (bfd *abfd,
3252 Elf_Internal_Rela *irel)
3254 static xtensa_insnbuf ibuff = NULL;
3255 static xtensa_insnbuf sbuff = NULL;
3256 xtensa_isa isa = xtensa_default_isa;
3260 if (contents == NULL)
3261 return XTENSA_UNDEFINED;
3263 if (bfd_get_section_limit (abfd, sec) <= irel->r_offset)
3264 return XTENSA_UNDEFINED;
3268 ibuff = xtensa_insnbuf_alloc (isa);
3269 sbuff = xtensa_insnbuf_alloc (isa);
3272 /* Decode the instruction. */
3273 xtensa_insnbuf_from_chars (isa, ibuff, &contents[irel->r_offset],
3274 sec->size - irel->r_offset);
3275 fmt = xtensa_format_decode (isa, ibuff);
3276 slot = get_relocation_slot (ELF32_R_TYPE (irel->r_info));
3277 if (slot == XTENSA_UNDEFINED)
3278 return XTENSA_UNDEFINED;
3279 xtensa_format_get_slot (isa, fmt, slot, ibuff, sbuff);
3280 return xtensa_opcode_decode (isa, fmt, slot, sbuff);
3285 is_l32r_relocation (bfd *abfd,
3288 Elf_Internal_Rela *irel)
3290 xtensa_opcode opcode;
3291 if (!is_operand_relocation (ELF32_R_TYPE (irel->r_info)))
3293 opcode = get_relocation_opcode (abfd, sec, contents, irel);
3294 return (opcode == get_l32r_opcode ());
3298 static bfd_size_type
3299 get_asm_simplify_size (bfd_byte *contents,
3300 bfd_size_type content_len,
3301 bfd_size_type offset)
3303 bfd_size_type insnlen, size = 0;
3305 /* Decode the size of the next two instructions. */
3306 insnlen = insn_decode_len (contents, content_len, offset);
3312 insnlen = insn_decode_len (contents, content_len, offset + size);
3322 is_alt_relocation (int r_type)
3324 return (r_type >= R_XTENSA_SLOT0_ALT
3325 && r_type <= R_XTENSA_SLOT14_ALT);
3330 is_operand_relocation (int r_type)
3340 if (r_type >= R_XTENSA_SLOT0_OP && r_type <= R_XTENSA_SLOT14_OP)
3342 if (r_type >= R_XTENSA_SLOT0_ALT && r_type <= R_XTENSA_SLOT14_ALT)
3351 #define MIN_INSN_LENGTH 2
3353 /* Return 0 if it fails to decode. */
3356 insn_decode_len (bfd_byte *contents,
3357 bfd_size_type content_len,
3358 bfd_size_type offset)
3361 xtensa_isa isa = xtensa_default_isa;
3363 static xtensa_insnbuf ibuff = NULL;
3365 if (offset + MIN_INSN_LENGTH > content_len)
3369 ibuff = xtensa_insnbuf_alloc (isa);
3370 xtensa_insnbuf_from_chars (isa, ibuff, &contents[offset],
3371 content_len - offset);
3372 fmt = xtensa_format_decode (isa, ibuff);
3373 if (fmt == XTENSA_UNDEFINED)
3375 insn_len = xtensa_format_length (isa, fmt);
3376 if (insn_len == XTENSA_UNDEFINED)
3382 /* Decode the opcode for a single slot instruction.
3383 Return 0 if it fails to decode or the instruction is multi-slot. */
3386 insn_decode_opcode (bfd_byte *contents,
3387 bfd_size_type content_len,
3388 bfd_size_type offset,
3391 xtensa_isa isa = xtensa_default_isa;
3393 static xtensa_insnbuf insnbuf = NULL;
3394 static xtensa_insnbuf slotbuf = NULL;
3396 if (offset + MIN_INSN_LENGTH > content_len)
3397 return XTENSA_UNDEFINED;
3399 if (insnbuf == NULL)
3401 insnbuf = xtensa_insnbuf_alloc (isa);
3402 slotbuf = xtensa_insnbuf_alloc (isa);
3405 xtensa_insnbuf_from_chars (isa, insnbuf, &contents[offset],
3406 content_len - offset);
3407 fmt = xtensa_format_decode (isa, insnbuf);
3408 if (fmt == XTENSA_UNDEFINED)
3409 return XTENSA_UNDEFINED;
3411 if (slot >= xtensa_format_num_slots (isa, fmt))
3412 return XTENSA_UNDEFINED;
3414 xtensa_format_get_slot (isa, fmt, slot, insnbuf, slotbuf);
3415 return xtensa_opcode_decode (isa, fmt, slot, slotbuf);
3419 /* The offset is the offset in the contents.
3420 The address is the address of that offset. */
3423 check_branch_target_aligned (bfd_byte *contents,
3424 bfd_size_type content_length,
3428 bfd_size_type insn_len = insn_decode_len (contents, content_length, offset);
3431 return check_branch_target_aligned_address (address, insn_len);
3436 check_loop_aligned (bfd_byte *contents,
3437 bfd_size_type content_length,
3441 bfd_size_type loop_len, insn_len;
3442 xtensa_opcode opcode =
3443 insn_decode_opcode (contents, content_length, offset, 0);
3444 BFD_ASSERT (opcode != XTENSA_UNDEFINED);
3445 if (opcode != XTENSA_UNDEFINED)
3447 BFD_ASSERT (xtensa_opcode_is_loop (xtensa_default_isa, opcode));
3448 if (!xtensa_opcode_is_loop (xtensa_default_isa, opcode))
3451 loop_len = insn_decode_len (contents, content_length, offset);
3452 BFD_ASSERT (loop_len != 0);
3456 insn_len = insn_decode_len (contents, content_length, offset + loop_len);
3457 BFD_ASSERT (insn_len != 0);
3461 return check_branch_target_aligned_address (address + loop_len, insn_len);
3466 check_branch_target_aligned_address (bfd_vma addr, int len)
3469 return (addr % 8 == 0);
3470 return ((addr >> 2) == ((addr + len - 1) >> 2));
3474 /* Instruction widening and narrowing. */
3476 /* When FLIX is available we need to access certain instructions only
3477 when they are 16-bit or 24-bit instructions. This table caches
3478 information about such instructions by walking through all the
3479 opcodes and finding the smallest single-slot format into which each
3482 static xtensa_format *op_single_fmt_table = NULL;
3486 init_op_single_format_table (void)
3488 xtensa_isa isa = xtensa_default_isa;
3489 xtensa_insnbuf ibuf;
3490 xtensa_opcode opcode;
3494 if (op_single_fmt_table)
3497 ibuf = xtensa_insnbuf_alloc (isa);
3498 num_opcodes = xtensa_isa_num_opcodes (isa);
3500 op_single_fmt_table = (xtensa_format *)
3501 bfd_malloc (sizeof (xtensa_format) * num_opcodes);
3502 for (opcode = 0; opcode < num_opcodes; opcode++)
3504 op_single_fmt_table[opcode] = XTENSA_UNDEFINED;
3505 for (fmt = 0; fmt < xtensa_isa_num_formats (isa); fmt++)
3507 if (xtensa_format_num_slots (isa, fmt) == 1
3508 && xtensa_opcode_encode (isa, fmt, 0, ibuf, opcode) == 0)
3510 xtensa_opcode old_fmt = op_single_fmt_table[opcode];
3511 int fmt_length = xtensa_format_length (isa, fmt);
3512 if (old_fmt == XTENSA_UNDEFINED
3513 || fmt_length < xtensa_format_length (isa, old_fmt))
3514 op_single_fmt_table[opcode] = fmt;
3518 xtensa_insnbuf_free (isa, ibuf);
3522 static xtensa_format
3523 get_single_format (xtensa_opcode opcode)
3525 init_op_single_format_table ();
3526 return op_single_fmt_table[opcode];
3530 /* For the set of narrowable instructions we do NOT include the
3531 narrowings beqz -> beqz.n or bnez -> bnez.n because of complexities
3532 involved during linker relaxation that may require these to
3533 re-expand in some conditions. Also, the narrowing "or" -> mov.n
3534 requires special case code to ensure it only works when op1 == op2. */
3542 struct string_pair narrowable[] =
3545 { "addi", "addi.n" },
3546 { "addmi", "addi.n" },
3547 { "l32i", "l32i.n" },
3548 { "movi", "movi.n" },
3550 { "retw", "retw.n" },
3551 { "s32i", "s32i.n" },
3552 { "or", "mov.n" } /* special case only when op1 == op2 */
3555 struct string_pair widenable[] =
3558 { "addi", "addi.n" },
3559 { "addmi", "addi.n" },
3560 { "beqz", "beqz.n" },
3561 { "bnez", "bnez.n" },
3562 { "l32i", "l32i.n" },
3563 { "movi", "movi.n" },
3565 { "retw", "retw.n" },
3566 { "s32i", "s32i.n" },
3567 { "or", "mov.n" } /* special case only when op1 == op2 */
3571 /* Attempt to narrow an instruction. Return true if the narrowing is
3572 valid. If the do_it parameter is non-zero, then perform the action
3573 in-place directly into the contents. Otherwise, do not modify the
3574 contents. The set of valid narrowing are specified by a string table
3575 but require some special case operand checks in some cases. */
3578 narrow_instruction (bfd_byte *contents,
3579 bfd_size_type content_length,
3580 bfd_size_type offset,
3583 xtensa_opcode opcode;
3584 bfd_size_type insn_len, opi;
3585 xtensa_isa isa = xtensa_default_isa;
3586 xtensa_format fmt, o_fmt;
3588 static xtensa_insnbuf insnbuf = NULL;
3589 static xtensa_insnbuf slotbuf = NULL;
3590 static xtensa_insnbuf o_insnbuf = NULL;
3591 static xtensa_insnbuf o_slotbuf = NULL;
3593 if (insnbuf == NULL)
3595 insnbuf = xtensa_insnbuf_alloc (isa);
3596 slotbuf = xtensa_insnbuf_alloc (isa);
3597 o_insnbuf = xtensa_insnbuf_alloc (isa);
3598 o_slotbuf = xtensa_insnbuf_alloc (isa);
3601 BFD_ASSERT (offset < content_length);
3603 if (content_length < 2)
3606 /* We will hand-code a few of these for a little while.
3607 These have all been specified in the assembler aleady. */
3608 xtensa_insnbuf_from_chars (isa, insnbuf, &contents[offset],
3609 content_length - offset);
3610 fmt = xtensa_format_decode (isa, insnbuf);
3611 if (xtensa_format_num_slots (isa, fmt) != 1)
3614 if (xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf) != 0)
3617 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
3618 if (opcode == XTENSA_UNDEFINED)
3620 insn_len = xtensa_format_length (isa, fmt);
3621 if (insn_len > content_length)
3624 for (opi = 0; opi < (sizeof (narrowable)/sizeof (struct string_pair)); ++opi)
3626 bfd_boolean is_or = (strcmp ("or", narrowable[opi].wide) == 0);
3628 if (opcode == xtensa_opcode_lookup (isa, narrowable[opi].wide))
3630 uint32 value, newval;
3631 int i, operand_count, o_operand_count;
3632 xtensa_opcode o_opcode;
3634 /* Address does not matter in this case. We might need to
3635 fix it to handle branches/jumps. */
3636 bfd_vma self_address = 0;
3638 o_opcode = xtensa_opcode_lookup (isa, narrowable[opi].narrow);
3639 if (o_opcode == XTENSA_UNDEFINED)
3641 o_fmt = get_single_format (o_opcode);
3642 if (o_fmt == XTENSA_UNDEFINED)
3645 if (xtensa_format_length (isa, fmt) != 3
3646 || xtensa_format_length (isa, o_fmt) != 2)
3649 xtensa_format_encode (isa, o_fmt, o_insnbuf);
3650 operand_count = xtensa_opcode_num_operands (isa, opcode);
3651 o_operand_count = xtensa_opcode_num_operands (isa, o_opcode);
3653 if (xtensa_opcode_encode (isa, o_fmt, 0, o_slotbuf, o_opcode) != 0)
3658 if (xtensa_opcode_num_operands (isa, o_opcode) != operand_count)
3663 uint32 rawval0, rawval1, rawval2;
3665 if (o_operand_count + 1 != operand_count)
3667 if (xtensa_operand_get_field (isa, opcode, 0,
3668 fmt, 0, slotbuf, &rawval0) != 0)
3670 if (xtensa_operand_get_field (isa, opcode, 1,
3671 fmt, 0, slotbuf, &rawval1) != 0)
3673 if (xtensa_operand_get_field (isa, opcode, 2,
3674 fmt, 0, slotbuf, &rawval2) != 0)
3677 if (rawval1 != rawval2)
3679 if (rawval0 == rawval1) /* it is a nop */
3683 for (i = 0; i < o_operand_count; ++i)
3685 if (xtensa_operand_get_field (isa, opcode, i, fmt, 0,
3687 || xtensa_operand_decode (isa, opcode, i, &value))
3690 /* PC-relative branches need adjustment, but
3691 the PC-rel operand will always have a relocation. */
3693 if (xtensa_operand_do_reloc (isa, o_opcode, i, &newval,
3695 || xtensa_operand_encode (isa, o_opcode, i, &newval)
3696 || xtensa_operand_set_field (isa, o_opcode, i, o_fmt, 0,
3701 if (xtensa_format_set_slot (isa, o_fmt, 0,
3702 o_insnbuf, o_slotbuf) != 0)
3706 xtensa_insnbuf_to_chars (isa, o_insnbuf, contents + offset,
3707 content_length - offset);
3715 /* Attempt to widen an instruction. Return true if the widening is
3716 valid. If the do_it parameter is non-zero, then the action should
3717 be performed inplace into the contents. Otherwise, do not modify
3718 the contents. The set of valid widenings are specified by a string
3719 table but require some special case operand checks in some
3723 widen_instruction (bfd_byte *contents,
3724 bfd_size_type content_length,
3725 bfd_size_type offset,
3728 xtensa_opcode opcode;
3729 bfd_size_type insn_len, opi;
3730 xtensa_isa isa = xtensa_default_isa;
3731 xtensa_format fmt, o_fmt;
3733 static xtensa_insnbuf insnbuf = NULL;
3734 static xtensa_insnbuf slotbuf = NULL;
3735 static xtensa_insnbuf o_insnbuf = NULL;
3736 static xtensa_insnbuf o_slotbuf = NULL;
3738 if (insnbuf == NULL)
3740 insnbuf = xtensa_insnbuf_alloc (isa);
3741 slotbuf = xtensa_insnbuf_alloc (isa);
3742 o_insnbuf = xtensa_insnbuf_alloc (isa);
3743 o_slotbuf = xtensa_insnbuf_alloc (isa);
3746 BFD_ASSERT (offset < content_length);
3748 if (content_length < 2)
3751 /* We will hand code a few of these for a little while.
3752 These have all been specified in the assembler aleady. */
3753 xtensa_insnbuf_from_chars (isa, insnbuf, &contents[offset],
3754 content_length - offset);
3755 fmt = xtensa_format_decode (isa, insnbuf);
3756 if (xtensa_format_num_slots (isa, fmt) != 1)
3759 if (xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf) != 0)
3762 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
3763 if (opcode == XTENSA_UNDEFINED)
3765 insn_len = xtensa_format_length (isa, fmt);
3766 if (insn_len > content_length)
3769 for (opi = 0; opi < (sizeof (widenable)/sizeof (struct string_pair)); ++opi)
3771 bfd_boolean is_or = (strcmp ("or", widenable[opi].wide) == 0);
3772 bfd_boolean is_branch = (strcmp ("beqz", widenable[opi].wide) == 0
3773 || strcmp ("bnez", widenable[opi].wide) == 0);
3775 if (opcode == xtensa_opcode_lookup (isa, widenable[opi].narrow))
3777 uint32 value, newval;
3778 int i, operand_count, o_operand_count, check_operand_count;
3779 xtensa_opcode o_opcode;
3781 /* Address does not matter in this case. We might need to fix it
3782 to handle branches/jumps. */
3783 bfd_vma self_address = 0;
3785 o_opcode = xtensa_opcode_lookup (isa, widenable[opi].wide);
3786 if (o_opcode == XTENSA_UNDEFINED)
3788 o_fmt = get_single_format (o_opcode);
3789 if (o_fmt == XTENSA_UNDEFINED)
3792 if (xtensa_format_length (isa, fmt) != 2
3793 || xtensa_format_length (isa, o_fmt) != 3)
3796 xtensa_format_encode (isa, o_fmt, o_insnbuf);
3797 operand_count = xtensa_opcode_num_operands (isa, opcode);
3798 o_operand_count = xtensa_opcode_num_operands (isa, o_opcode);
3799 check_operand_count = o_operand_count;
3801 if (xtensa_opcode_encode (isa, o_fmt, 0, o_slotbuf, o_opcode) != 0)
3806 if (xtensa_opcode_num_operands (isa, o_opcode) != operand_count)
3811 uint32 rawval0, rawval1;
3813 if (o_operand_count != operand_count + 1)
3815 if (xtensa_operand_get_field (isa, opcode, 0,
3816 fmt, 0, slotbuf, &rawval0) != 0)
3818 if (xtensa_operand_get_field (isa, opcode, 1,
3819 fmt, 0, slotbuf, &rawval1) != 0)
3821 if (rawval0 == rawval1) /* it is a nop */
3825 check_operand_count--;
3827 for (i = 0; i < check_operand_count; ++i)
3830 if (is_or && i == o_operand_count - 1)
3832 if (xtensa_operand_get_field (isa, opcode, new_i, fmt, 0,
3834 || xtensa_operand_decode (isa, opcode, new_i, &value))
3837 /* PC-relative branches need adjustment, but
3838 the PC-rel operand will always have a relocation. */
3840 if (xtensa_operand_do_reloc (isa, o_opcode, i, &newval,
3842 || xtensa_operand_encode (isa, o_opcode, i, &newval)
3843 || xtensa_operand_set_field (isa, o_opcode, i, o_fmt, 0,
3848 if (xtensa_format_set_slot (isa, o_fmt, 0, o_insnbuf, o_slotbuf))
3852 xtensa_insnbuf_to_chars (isa, o_insnbuf, contents + offset,
3853 content_length - offset);
3861 /* Code for transforming CALLs at link-time. */
3863 static bfd_reloc_status_type
3864 elf_xtensa_do_asm_simplify (bfd_byte *contents,
3866 bfd_vma content_length,
3867 char **error_message)
3869 static xtensa_insnbuf insnbuf = NULL;
3870 static xtensa_insnbuf slotbuf = NULL;
3871 xtensa_format core_format = XTENSA_UNDEFINED;
3872 xtensa_opcode opcode;
3873 xtensa_opcode direct_call_opcode;
3874 xtensa_isa isa = xtensa_default_isa;
3875 bfd_byte *chbuf = contents + address;
3878 if (insnbuf == NULL)
3880 insnbuf = xtensa_insnbuf_alloc (isa);
3881 slotbuf = xtensa_insnbuf_alloc (isa);
3884 if (content_length < address)
3886 *error_message = _("Attempt to convert L32R/CALLX to CALL failed");
3887 return bfd_reloc_other;
3890 opcode = get_expanded_call_opcode (chbuf, content_length - address, 0);
3891 direct_call_opcode = swap_callx_for_call_opcode (opcode);
3892 if (direct_call_opcode == XTENSA_UNDEFINED)
3894 *error_message = _("Attempt to convert L32R/CALLX to CALL failed");
3895 return bfd_reloc_other;
3898 /* Assemble a NOP ("or a1, a1, a1") into the 0 byte offset. */
3899 core_format = xtensa_format_lookup (isa, "x24");
3900 opcode = xtensa_opcode_lookup (isa, "or");
3901 xtensa_opcode_encode (isa, core_format, 0, slotbuf, opcode);
3902 for (opn = 0; opn < 3; opn++)
3905 xtensa_operand_encode (isa, opcode, opn, ®no);
3906 xtensa_operand_set_field (isa, opcode, opn, core_format, 0,
3909 xtensa_format_encode (isa, core_format, insnbuf);
3910 xtensa_format_set_slot (isa, core_format, 0, insnbuf, slotbuf);
3911 xtensa_insnbuf_to_chars (isa, insnbuf, chbuf, content_length - address);
3913 /* Assemble a CALL ("callN 0") into the 3 byte offset. */
3914 xtensa_opcode_encode (isa, core_format, 0, slotbuf, direct_call_opcode);
3915 xtensa_operand_set_field (isa, opcode, 0, core_format, 0, slotbuf, 0);
3917 xtensa_format_encode (isa, core_format, insnbuf);
3918 xtensa_format_set_slot (isa, core_format, 0, insnbuf, slotbuf);
3919 xtensa_insnbuf_to_chars (isa, insnbuf, chbuf + 3,
3920 content_length - address - 3);
3922 return bfd_reloc_ok;
3926 static bfd_reloc_status_type
3927 contract_asm_expansion (bfd_byte *contents,
3928 bfd_vma content_length,
3929 Elf_Internal_Rela *irel,
3930 char **error_message)
3932 bfd_reloc_status_type retval =
3933 elf_xtensa_do_asm_simplify (contents, irel->r_offset, content_length,
3936 if (retval != bfd_reloc_ok)
3937 return bfd_reloc_dangerous;
3939 /* Update the irel->r_offset field so that the right immediate and
3940 the right instruction are modified during the relocation. */
3941 irel->r_offset += 3;
3942 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), R_XTENSA_SLOT0_OP);
3943 return bfd_reloc_ok;
3947 static xtensa_opcode
3948 swap_callx_for_call_opcode (xtensa_opcode opcode)
3950 init_call_opcodes ();
3952 if (opcode == callx0_op) return call0_op;
3953 if (opcode == callx4_op) return call4_op;
3954 if (opcode == callx8_op) return call8_op;
3955 if (opcode == callx12_op) return call12_op;
3957 /* Return XTENSA_UNDEFINED if the opcode is not an indirect call. */
3958 return XTENSA_UNDEFINED;
3962 /* Check if "buf" is pointing to a "L32R aN; CALLX aN" or "CONST16 aN;
3963 CONST16 aN; CALLX aN" sequence, and if so, return the CALLX opcode.
3964 If not, return XTENSA_UNDEFINED. */
3966 #define L32R_TARGET_REG_OPERAND 0
3967 #define CONST16_TARGET_REG_OPERAND 0
3968 #define CALLN_SOURCE_OPERAND 0
3970 static xtensa_opcode
3971 get_expanded_call_opcode (bfd_byte *buf, int bufsize, bfd_boolean *p_uses_l32r)
3973 static xtensa_insnbuf insnbuf = NULL;
3974 static xtensa_insnbuf slotbuf = NULL;
3976 xtensa_opcode opcode;
3977 xtensa_isa isa = xtensa_default_isa;
3978 uint32 regno, const16_regno, call_regno;
3981 if (insnbuf == NULL)
3983 insnbuf = xtensa_insnbuf_alloc (isa);
3984 slotbuf = xtensa_insnbuf_alloc (isa);
3987 xtensa_insnbuf_from_chars (isa, insnbuf, buf, bufsize);
3988 fmt = xtensa_format_decode (isa, insnbuf);
3989 if (fmt == XTENSA_UNDEFINED
3990 || xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf))
3991 return XTENSA_UNDEFINED;
3993 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
3994 if (opcode == XTENSA_UNDEFINED)
3995 return XTENSA_UNDEFINED;
3997 if (opcode == get_l32r_opcode ())
4000 *p_uses_l32r = TRUE;
4001 if (xtensa_operand_get_field (isa, opcode, L32R_TARGET_REG_OPERAND,
4002 fmt, 0, slotbuf, ®no)
4003 || xtensa_operand_decode (isa, opcode, L32R_TARGET_REG_OPERAND,
4005 return XTENSA_UNDEFINED;
4007 else if (opcode == get_const16_opcode ())
4010 *p_uses_l32r = FALSE;
4011 if (xtensa_operand_get_field (isa, opcode, CONST16_TARGET_REG_OPERAND,
4012 fmt, 0, slotbuf, ®no)
4013 || xtensa_operand_decode (isa, opcode, CONST16_TARGET_REG_OPERAND,
4015 return XTENSA_UNDEFINED;
4017 /* Check that the next instruction is also CONST16. */
4018 offset += xtensa_format_length (isa, fmt);
4019 xtensa_insnbuf_from_chars (isa, insnbuf, buf + offset, bufsize - offset);
4020 fmt = xtensa_format_decode (isa, insnbuf);
4021 if (fmt == XTENSA_UNDEFINED
4022 || xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf))
4023 return XTENSA_UNDEFINED;
4024 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
4025 if (opcode != get_const16_opcode ())
4026 return XTENSA_UNDEFINED;
4028 if (xtensa_operand_get_field (isa, opcode, CONST16_TARGET_REG_OPERAND,
4029 fmt, 0, slotbuf, &const16_regno)
4030 || xtensa_operand_decode (isa, opcode, CONST16_TARGET_REG_OPERAND,
4032 || const16_regno != regno)
4033 return XTENSA_UNDEFINED;
4036 return XTENSA_UNDEFINED;
4038 /* Next instruction should be an CALLXn with operand 0 == regno. */
4039 offset += xtensa_format_length (isa, fmt);
4040 xtensa_insnbuf_from_chars (isa, insnbuf, buf + offset, bufsize - offset);
4041 fmt = xtensa_format_decode (isa, insnbuf);
4042 if (fmt == XTENSA_UNDEFINED
4043 || xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf))
4044 return XTENSA_UNDEFINED;
4045 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
4046 if (opcode == XTENSA_UNDEFINED
4047 || !is_indirect_call_opcode (opcode))
4048 return XTENSA_UNDEFINED;
4050 if (xtensa_operand_get_field (isa, opcode, CALLN_SOURCE_OPERAND,
4051 fmt, 0, slotbuf, &call_regno)
4052 || xtensa_operand_decode (isa, opcode, CALLN_SOURCE_OPERAND,
4054 return XTENSA_UNDEFINED;
4056 if (call_regno != regno)
4057 return XTENSA_UNDEFINED;
4063 /* Data structures used during relaxation. */
4065 /* r_reloc: relocation values. */
4067 /* Through the relaxation process, we need to keep track of the values
4068 that will result from evaluating relocations. The standard ELF
4069 relocation structure is not sufficient for this purpose because we're
4070 operating on multiple input files at once, so we need to know which
4071 input file a relocation refers to. The r_reloc structure thus
4072 records both the input file (bfd) and ELF relocation.
4074 For efficiency, an r_reloc also contains a "target_offset" field to
4075 cache the target-section-relative offset value that is represented by
4078 The r_reloc also contains a virtual offset that allows multiple
4079 inserted literals to be placed at the same "address" with
4080 different offsets. */
4082 typedef struct r_reloc_struct r_reloc;
4084 struct r_reloc_struct
4087 Elf_Internal_Rela rela;
4088 bfd_vma target_offset;
4089 bfd_vma virtual_offset;
4093 /* The r_reloc structure is included by value in literal_value, but not
4094 every literal_value has an associated relocation -- some are simple
4095 constants. In such cases, we set all the fields in the r_reloc
4096 struct to zero. The r_reloc_is_const function should be used to
4097 detect this case. */
4100 r_reloc_is_const (const r_reloc *r_rel)
4102 return (r_rel->abfd == NULL);
4107 r_reloc_get_target_offset (const r_reloc *r_rel)
4109 bfd_vma target_offset;
4110 unsigned long r_symndx;
4112 BFD_ASSERT (!r_reloc_is_const (r_rel));
4113 r_symndx = ELF32_R_SYM (r_rel->rela.r_info);
4114 target_offset = get_elf_r_symndx_offset (r_rel->abfd, r_symndx);
4115 return (target_offset + r_rel->rela.r_addend);
4119 static struct elf_link_hash_entry *
4120 r_reloc_get_hash_entry (const r_reloc *r_rel)
4122 unsigned long r_symndx = ELF32_R_SYM (r_rel->rela.r_info);
4123 return get_elf_r_symndx_hash_entry (r_rel->abfd, r_symndx);
4128 r_reloc_get_section (const r_reloc *r_rel)
4130 unsigned long r_symndx = ELF32_R_SYM (r_rel->rela.r_info);
4131 return get_elf_r_symndx_section (r_rel->abfd, r_symndx);
4136 r_reloc_is_defined (const r_reloc *r_rel)
4142 sec = r_reloc_get_section (r_rel);
4143 if (sec == bfd_abs_section_ptr
4144 || sec == bfd_com_section_ptr
4145 || sec == bfd_und_section_ptr)
4152 r_reloc_init (r_reloc *r_rel,
4154 Elf_Internal_Rela *irel,
4156 bfd_size_type content_length)
4159 reloc_howto_type *howto;
4163 r_rel->rela = *irel;
4165 r_rel->target_offset = r_reloc_get_target_offset (r_rel);
4166 r_rel->virtual_offset = 0;
4167 r_type = ELF32_R_TYPE (r_rel->rela.r_info);
4168 howto = &elf_howto_table[r_type];
4169 if (howto->partial_inplace)
4171 bfd_vma inplace_val;
4172 BFD_ASSERT (r_rel->rela.r_offset < content_length);
4174 inplace_val = bfd_get_32 (abfd, &contents[r_rel->rela.r_offset]);
4175 r_rel->target_offset += inplace_val;
4179 memset (r_rel, 0, sizeof (r_reloc));
4186 print_r_reloc (FILE *fp, const r_reloc *r_rel)
4188 if (r_reloc_is_defined (r_rel))
4190 asection *sec = r_reloc_get_section (r_rel);
4191 fprintf (fp, " %s(%s + ", sec->owner->filename, sec->name);
4193 else if (r_reloc_get_hash_entry (r_rel))
4194 fprintf (fp, " %s + ", r_reloc_get_hash_entry (r_rel)->root.root.string);
4196 fprintf (fp, " ?? + ");
4198 fprintf_vma (fp, r_rel->target_offset);
4199 if (r_rel->virtual_offset)
4201 fprintf (fp, " + ");
4202 fprintf_vma (fp, r_rel->virtual_offset);
4211 /* source_reloc: relocations that reference literals. */
4213 /* To determine whether literals can be coalesced, we need to first
4214 record all the relocations that reference the literals. The
4215 source_reloc structure below is used for this purpose. The
4216 source_reloc entries are kept in a per-literal-section array, sorted
4217 by offset within the literal section (i.e., target offset).
4219 The source_sec and r_rel.rela.r_offset fields identify the source of
4220 the relocation. The r_rel field records the relocation value, i.e.,
4221 the offset of the literal being referenced. The opnd field is needed
4222 to determine the range of the immediate field to which the relocation
4223 applies, so we can determine whether another literal with the same
4224 value is within range. The is_null field is true when the relocation
4225 is being removed (e.g., when an L32R is being removed due to a CALLX
4226 that is converted to a direct CALL). */
4228 typedef struct source_reloc_struct source_reloc;
4230 struct source_reloc_struct
4232 asection *source_sec;
4234 xtensa_opcode opcode;
4236 bfd_boolean is_null;
4237 bfd_boolean is_abs_literal;
4242 init_source_reloc (source_reloc *reloc,
4243 asection *source_sec,
4244 const r_reloc *r_rel,
4245 xtensa_opcode opcode,
4247 bfd_boolean is_abs_literal)
4249 reloc->source_sec = source_sec;
4250 reloc->r_rel = *r_rel;
4251 reloc->opcode = opcode;
4253 reloc->is_null = FALSE;
4254 reloc->is_abs_literal = is_abs_literal;
4258 /* Find the source_reloc for a particular source offset and relocation
4259 type. Note that the array is sorted by _target_ offset, so this is
4260 just a linear search. */
4262 static source_reloc *
4263 find_source_reloc (source_reloc *src_relocs,
4266 Elf_Internal_Rela *irel)
4270 for (i = 0; i < src_count; i++)
4272 if (src_relocs[i].source_sec == sec
4273 && src_relocs[i].r_rel.rela.r_offset == irel->r_offset
4274 && (ELF32_R_TYPE (src_relocs[i].r_rel.rela.r_info)
4275 == ELF32_R_TYPE (irel->r_info)))
4276 return &src_relocs[i];
4284 source_reloc_compare (const void *ap, const void *bp)
4286 const source_reloc *a = (const source_reloc *) ap;
4287 const source_reloc *b = (const source_reloc *) bp;
4289 if (a->r_rel.target_offset != b->r_rel.target_offset)
4290 return (a->r_rel.target_offset - b->r_rel.target_offset);
4292 /* We don't need to sort on these criteria for correctness,
4293 but enforcing a more strict ordering prevents unstable qsort
4294 from behaving differently with different implementations.
4295 Without the code below we get correct but different results
4296 on Solaris 2.7 and 2.8. We would like to always produce the
4297 same results no matter the host. */
4299 if ((!a->is_null) - (!b->is_null))
4300 return ((!a->is_null) - (!b->is_null));
4301 return internal_reloc_compare (&a->r_rel.rela, &b->r_rel.rela);
4305 /* Literal values and value hash tables. */
4307 /* Literals with the same value can be coalesced. The literal_value
4308 structure records the value of a literal: the "r_rel" field holds the
4309 information from the relocation on the literal (if there is one) and
4310 the "value" field holds the contents of the literal word itself.
4312 The value_map structure records a literal value along with the
4313 location of a literal holding that value. The value_map hash table
4314 is indexed by the literal value, so that we can quickly check if a
4315 particular literal value has been seen before and is thus a candidate
4318 typedef struct literal_value_struct literal_value;
4319 typedef struct value_map_struct value_map;
4320 typedef struct value_map_hash_table_struct value_map_hash_table;
4322 struct literal_value_struct
4325 unsigned long value;
4326 bfd_boolean is_abs_literal;
4329 struct value_map_struct
4331 literal_value val; /* The literal value. */
4332 r_reloc loc; /* Location of the literal. */
4336 struct value_map_hash_table_struct
4338 unsigned bucket_count;
4339 value_map **buckets;
4341 bfd_boolean has_last_loc;
4347 init_literal_value (literal_value *lit,
4348 const r_reloc *r_rel,
4349 unsigned long value,
4350 bfd_boolean is_abs_literal)
4352 lit->r_rel = *r_rel;
4354 lit->is_abs_literal = is_abs_literal;
4359 literal_value_equal (const literal_value *src1,
4360 const literal_value *src2,
4361 bfd_boolean final_static_link)
4363 struct elf_link_hash_entry *h1, *h2;
4365 if (r_reloc_is_const (&src1->r_rel) != r_reloc_is_const (&src2->r_rel))
4368 if (r_reloc_is_const (&src1->r_rel))
4369 return (src1->value == src2->value);
4371 if (ELF32_R_TYPE (src1->r_rel.rela.r_info)
4372 != ELF32_R_TYPE (src2->r_rel.rela.r_info))
4375 if (src1->r_rel.target_offset != src2->r_rel.target_offset)
4378 if (src1->r_rel.virtual_offset != src2->r_rel.virtual_offset)
4381 if (src1->value != src2->value)
4384 /* Now check for the same section (if defined) or the same elf_hash
4385 (if undefined or weak). */
4386 h1 = r_reloc_get_hash_entry (&src1->r_rel);
4387 h2 = r_reloc_get_hash_entry (&src2->r_rel);
4388 if (r_reloc_is_defined (&src1->r_rel)
4389 && (final_static_link
4390 || ((!h1 || h1->root.type != bfd_link_hash_defweak)
4391 && (!h2 || h2->root.type != bfd_link_hash_defweak))))
4393 if (r_reloc_get_section (&src1->r_rel)
4394 != r_reloc_get_section (&src2->r_rel))
4399 /* Require that the hash entries (i.e., symbols) be identical. */
4400 if (h1 != h2 || h1 == 0)
4404 if (src1->is_abs_literal != src2->is_abs_literal)
4411 /* Must be power of 2. */
4412 #define INITIAL_HASH_RELOC_BUCKET_COUNT 1024
4414 static value_map_hash_table *
4415 value_map_hash_table_init (void)
4417 value_map_hash_table *values;
4419 values = (value_map_hash_table *)
4420 bfd_zmalloc (sizeof (value_map_hash_table));
4421 values->bucket_count = INITIAL_HASH_RELOC_BUCKET_COUNT;
4423 values->buckets = (value_map **)
4424 bfd_zmalloc (sizeof (value_map *) * values->bucket_count);
4425 if (values->buckets == NULL)
4430 values->has_last_loc = FALSE;
4437 value_map_hash_table_delete (value_map_hash_table *table)
4439 free (table->buckets);
4445 hash_bfd_vma (bfd_vma val)
4447 return (val >> 2) + (val >> 10);
4452 literal_value_hash (const literal_value *src)
4456 hash_val = hash_bfd_vma (src->value);
4457 if (!r_reloc_is_const (&src->r_rel))
4461 hash_val += hash_bfd_vma (src->is_abs_literal * 1000);
4462 hash_val += hash_bfd_vma (src->r_rel.target_offset);
4463 hash_val += hash_bfd_vma (src->r_rel.virtual_offset);
4465 /* Now check for the same section and the same elf_hash. */
4466 if (r_reloc_is_defined (&src->r_rel))
4467 sec_or_hash = r_reloc_get_section (&src->r_rel);
4469 sec_or_hash = r_reloc_get_hash_entry (&src->r_rel);
4470 hash_val += hash_bfd_vma ((bfd_vma) (size_t) sec_or_hash);
4476 /* Check if the specified literal_value has been seen before. */
4479 value_map_get_cached_value (value_map_hash_table *map,
4480 const literal_value *val,
4481 bfd_boolean final_static_link)
4487 idx = literal_value_hash (val);
4488 idx = idx & (map->bucket_count - 1);
4489 bucket = map->buckets[idx];
4490 for (map_e = bucket; map_e; map_e = map_e->next)
4492 if (literal_value_equal (&map_e->val, val, final_static_link))
4499 /* Record a new literal value. It is illegal to call this if VALUE
4500 already has an entry here. */
4503 add_value_map (value_map_hash_table *map,
4504 const literal_value *val,
4506 bfd_boolean final_static_link)
4508 value_map **bucket_p;
4511 value_map *val_e = (value_map *) bfd_zmalloc (sizeof (value_map));
4514 bfd_set_error (bfd_error_no_memory);
4518 BFD_ASSERT (!value_map_get_cached_value (map, val, final_static_link));
4522 idx = literal_value_hash (val);
4523 idx = idx & (map->bucket_count - 1);
4524 bucket_p = &map->buckets[idx];
4526 val_e->next = *bucket_p;
4529 /* FIXME: Consider resizing the hash table if we get too many entries. */
4535 /* Lists of text actions (ta_) for narrowing, widening, longcall
4536 conversion, space fill, code & literal removal, etc. */
4538 /* The following text actions are generated:
4540 "ta_remove_insn" remove an instruction or instructions
4541 "ta_remove_longcall" convert longcall to call
4542 "ta_convert_longcall" convert longcall to nop/call
4543 "ta_narrow_insn" narrow a wide instruction
4544 "ta_widen" widen a narrow instruction
4545 "ta_fill" add fill or remove fill
4546 removed < 0 is a fill; branches to the fill address will be
4547 changed to address + fill size (e.g., address - removed)
4548 removed >= 0 branches to the fill address will stay unchanged
4549 "ta_remove_literal" remove a literal; this action is
4550 indicated when a literal is removed
4552 "ta_add_literal" insert a new literal; this action is
4553 indicated when a literal has been moved.
4554 It may use a virtual_offset because
4555 multiple literals can be placed at the
4558 For each of these text actions, we also record the number of bytes
4559 removed by performing the text action. In the case of a "ta_widen"
4560 or a "ta_fill" that adds space, the removed_bytes will be negative. */
4562 typedef struct text_action_struct text_action;
4563 typedef struct text_action_list_struct text_action_list;
4564 typedef enum text_action_enum_t text_action_t;
4566 enum text_action_enum_t
4569 ta_remove_insn, /* removed = -size */
4570 ta_remove_longcall, /* removed = -size */
4571 ta_convert_longcall, /* removed = 0 */
4572 ta_narrow_insn, /* removed = -1 */
4573 ta_widen_insn, /* removed = +1 */
4574 ta_fill, /* removed = +size */
4580 /* Structure for a text action record. */
4581 struct text_action_struct
4583 text_action_t action;
4584 asection *sec; /* Optional */
4586 bfd_vma virtual_offset; /* Zero except for adding literals. */
4588 literal_value value; /* Only valid when adding literals. */
4594 /* List of all of the actions taken on a text section. */
4595 struct text_action_list_struct
4601 static text_action *
4602 find_fill_action (text_action_list *l, asection *sec, bfd_vma offset)
4606 /* It is not necessary to fill at the end of a section. */
4607 if (sec->size == offset)
4610 for (m_p = &l->head; *m_p && (*m_p)->offset <= offset; m_p = &(*m_p)->next)
4612 text_action *t = *m_p;
4613 /* When the action is another fill at the same address,
4614 just increase the size. */
4615 if (t->offset == offset && t->action == ta_fill)
4623 compute_removed_action_diff (const text_action *ta,
4627 int removable_space)
4630 int current_removed = 0;
4633 current_removed = ta->removed_bytes;
4635 BFD_ASSERT (ta == NULL || ta->offset == offset);
4636 BFD_ASSERT (ta == NULL || ta->action == ta_fill);
4638 /* It is not necessary to fill at the end of a section. Clean this up. */
4639 if (sec->size == offset)
4640 new_removed = removable_space - 0;
4644 int added = -removed - current_removed;
4645 /* Ignore multiples of the section alignment. */
4646 added = ((1 << sec->alignment_power) - 1) & added;
4647 new_removed = (-added);
4649 /* Modify for removable. */
4650 space = removable_space - new_removed;
4651 new_removed = (removable_space
4652 - (((1 << sec->alignment_power) - 1) & space));
4654 return (new_removed - current_removed);
4659 adjust_fill_action (text_action *ta, int fill_diff)
4661 ta->removed_bytes += fill_diff;
4665 /* Add a modification action to the text. For the case of adding or
4666 removing space, modify any current fill and assume that
4667 "unreachable_space" bytes can be freely contracted. Note that a
4668 negative removed value is a fill. */
4671 text_action_add (text_action_list *l,
4672 text_action_t action,
4680 /* It is not necessary to fill at the end of a section. */
4681 if (action == ta_fill && sec->size == offset)
4684 /* It is not necessary to fill 0 bytes. */
4685 if (action == ta_fill && removed == 0)
4688 for (m_p = &l->head; *m_p && (*m_p)->offset <= offset; m_p = &(*m_p)->next)
4690 text_action *t = *m_p;
4691 /* When the action is another fill at the same address,
4692 just increase the size. */
4693 if (t->offset == offset && t->action == ta_fill && action == ta_fill)
4695 t->removed_bytes += removed;
4700 /* Create a new record and fill it up. */
4701 ta = (text_action *) bfd_zmalloc (sizeof (text_action));
4702 ta->action = action;
4704 ta->offset = offset;
4705 ta->removed_bytes = removed;
4712 text_action_add_literal (text_action_list *l,
4713 text_action_t action,
4715 const literal_value *value,
4720 asection *sec = r_reloc_get_section (loc);
4721 bfd_vma offset = loc->target_offset;
4722 bfd_vma virtual_offset = loc->virtual_offset;
4724 BFD_ASSERT (action == ta_add_literal);
4726 for (m_p = &l->head; *m_p != NULL; m_p = &(*m_p)->next)
4728 if ((*m_p)->offset > offset
4729 && ((*m_p)->offset != offset
4730 || (*m_p)->virtual_offset > virtual_offset))
4734 /* Create a new record and fill it up. */
4735 ta = (text_action *) bfd_zmalloc (sizeof (text_action));
4736 ta->action = action;
4738 ta->offset = offset;
4739 ta->virtual_offset = virtual_offset;
4741 ta->removed_bytes = removed;
4748 offset_with_removed_text (text_action_list *action_list, bfd_vma offset)
4753 for (r = action_list->head; r && r->offset <= offset; r = r->next)
4755 if (r->offset < offset
4756 || (r->action == ta_fill && r->removed_bytes < 0))
4757 removed += r->removed_bytes;
4760 return (offset - removed);
4765 offset_with_removed_text_before_fill (text_action_list *action_list,
4771 for (r = action_list->head; r && r->offset < offset; r = r->next)
4772 removed += r->removed_bytes;
4774 return (offset - removed);
4778 /* The find_insn_action routine will only find non-fill actions. */
4780 static text_action *
4781 find_insn_action (text_action_list *action_list, bfd_vma offset)
4784 for (t = action_list->head; t; t = t->next)
4786 if (t->offset == offset)
4793 case ta_remove_insn:
4794 case ta_remove_longcall:
4795 case ta_convert_longcall:
4796 case ta_narrow_insn:
4799 case ta_remove_literal:
4800 case ta_add_literal:
4813 print_action_list (FILE *fp, text_action_list *action_list)
4817 fprintf (fp, "Text Action\n");
4818 for (r = action_list->head; r != NULL; r = r->next)
4820 const char *t = "unknown";
4823 case ta_remove_insn:
4824 t = "remove_insn"; break;
4825 case ta_remove_longcall:
4826 t = "remove_longcall"; break;
4827 case ta_convert_longcall:
4828 t = "remove_longcall"; break;
4829 case ta_narrow_insn:
4830 t = "narrow_insn"; break;
4832 t = "widen_insn"; break;
4837 case ta_remove_literal:
4838 t = "remove_literal"; break;
4839 case ta_add_literal:
4840 t = "add_literal"; break;
4843 fprintf (fp, "%s: %s[0x%lx] \"%s\" %d\n",
4844 r->sec->owner->filename,
4845 r->sec->name, r->offset, t, r->removed_bytes);
4852 /* Lists of literals being coalesced or removed. */
4854 /* In the usual case, the literal identified by "from" is being
4855 coalesced with another literal identified by "to". If the literal is
4856 unused and is being removed altogether, "to.abfd" will be NULL.
4857 The removed_literal entries are kept on a per-section list, sorted
4858 by the "from" offset field. */
4860 typedef struct removed_literal_struct removed_literal;
4861 typedef struct removed_literal_list_struct removed_literal_list;
4863 struct removed_literal_struct
4867 removed_literal *next;
4870 struct removed_literal_list_struct
4872 removed_literal *head;
4873 removed_literal *tail;
4877 /* Record that the literal at "from" is being removed. If "to" is not
4878 NULL, the "from" literal is being coalesced with the "to" literal. */
4881 add_removed_literal (removed_literal_list *removed_list,
4882 const r_reloc *from,
4885 removed_literal *r, *new_r, *next_r;
4887 new_r = (removed_literal *) bfd_zmalloc (sizeof (removed_literal));
4889 new_r->from = *from;
4893 new_r->to.abfd = NULL;
4896 r = removed_list->head;
4899 removed_list->head = new_r;
4900 removed_list->tail = new_r;
4902 /* Special check for common case of append. */
4903 else if (removed_list->tail->from.target_offset < from->target_offset)
4905 removed_list->tail->next = new_r;
4906 removed_list->tail = new_r;
4910 while (r->from.target_offset < from->target_offset && r->next)
4916 new_r->next = next_r;
4918 removed_list->tail = new_r;
4923 /* Check if the list of removed literals contains an entry for the
4924 given address. Return the entry if found. */
4926 static removed_literal *
4927 find_removed_literal (removed_literal_list *removed_list, bfd_vma addr)
4929 removed_literal *r = removed_list->head;
4930 while (r && r->from.target_offset < addr)
4932 if (r && r->from.target_offset == addr)
4941 print_removed_literals (FILE *fp, removed_literal_list *removed_list)
4944 r = removed_list->head;
4946 fprintf (fp, "Removed Literals\n");
4947 for (; r != NULL; r = r->next)
4949 print_r_reloc (fp, &r->from);
4950 fprintf (fp, " => ");
4951 if (r->to.abfd == NULL)
4952 fprintf (fp, "REMOVED");
4954 print_r_reloc (fp, &r->to);
4962 /* Per-section data for relaxation. */
4964 typedef struct reloc_bfd_fix_struct reloc_bfd_fix;
4966 struct xtensa_relax_info_struct
4968 bfd_boolean is_relaxable_literal_section;
4969 bfd_boolean is_relaxable_asm_section;
4970 int visited; /* Number of times visited. */
4972 source_reloc *src_relocs; /* Array[src_count]. */
4974 int src_next; /* Next src_relocs entry to assign. */
4976 removed_literal_list removed_list;
4977 text_action_list action_list;
4979 reloc_bfd_fix *fix_list;
4980 reloc_bfd_fix *fix_array;
4981 unsigned fix_array_count;
4983 /* Support for expanding the reloc array that is stored
4984 in the section structure. If the relocations have been
4985 reallocated, the newly allocated relocations will be referenced
4986 here along with the actual size allocated. The relocation
4987 count will always be found in the section structure. */
4988 Elf_Internal_Rela *allocated_relocs;
4989 unsigned relocs_count;
4990 unsigned allocated_relocs_count;
4993 struct elf_xtensa_section_data
4995 struct bfd_elf_section_data elf;
4996 xtensa_relax_info relax_info;
5001 elf_xtensa_new_section_hook (bfd *abfd, asection *sec)
5003 struct elf_xtensa_section_data *sdata;
5004 bfd_size_type amt = sizeof (*sdata);
5006 sdata = (struct elf_xtensa_section_data *) bfd_zalloc (abfd, amt);
5009 sec->used_by_bfd = (void *) sdata;
5011 return _bfd_elf_new_section_hook (abfd, sec);
5015 static xtensa_relax_info *
5016 get_xtensa_relax_info (asection *sec)
5018 struct elf_xtensa_section_data *section_data;
5020 /* No info available if no section or if it is an output section. */
5021 if (!sec || sec == sec->output_section)
5024 section_data = (struct elf_xtensa_section_data *) elf_section_data (sec);
5025 return §ion_data->relax_info;
5030 init_xtensa_relax_info (asection *sec)
5032 xtensa_relax_info *relax_info = get_xtensa_relax_info (sec);
5034 relax_info->is_relaxable_literal_section = FALSE;
5035 relax_info->is_relaxable_asm_section = FALSE;
5036 relax_info->visited = 0;
5038 relax_info->src_relocs = NULL;
5039 relax_info->src_count = 0;
5040 relax_info->src_next = 0;
5042 relax_info->removed_list.head = NULL;
5043 relax_info->removed_list.tail = NULL;
5045 relax_info->action_list.head = NULL;
5047 relax_info->fix_list = NULL;
5048 relax_info->fix_array = NULL;
5049 relax_info->fix_array_count = 0;
5051 relax_info->allocated_relocs = NULL;
5052 relax_info->relocs_count = 0;
5053 relax_info->allocated_relocs_count = 0;
5057 /* Coalescing literals may require a relocation to refer to a section in
5058 a different input file, but the standard relocation information
5059 cannot express that. Instead, the reloc_bfd_fix structures are used
5060 to "fix" the relocations that refer to sections in other input files.
5061 These structures are kept on per-section lists. The "src_type" field
5062 records the relocation type in case there are multiple relocations on
5063 the same location. FIXME: This is ugly; an alternative might be to
5064 add new symbols with the "owner" field to some other input file. */
5066 struct reloc_bfd_fix_struct
5070 unsigned src_type; /* Relocation type. */
5073 asection *target_sec;
5074 bfd_vma target_offset;
5075 bfd_boolean translated;
5077 reloc_bfd_fix *next;
5081 static reloc_bfd_fix *
5082 reloc_bfd_fix_init (asection *src_sec,
5086 asection *target_sec,
5087 bfd_vma target_offset,
5088 bfd_boolean translated)
5092 fix = (reloc_bfd_fix *) bfd_malloc (sizeof (reloc_bfd_fix));
5093 fix->src_sec = src_sec;
5094 fix->src_offset = src_offset;
5095 fix->src_type = src_type;
5096 fix->target_abfd = target_abfd;
5097 fix->target_sec = target_sec;
5098 fix->target_offset = target_offset;
5099 fix->translated = translated;
5106 add_fix (asection *src_sec, reloc_bfd_fix *fix)
5108 xtensa_relax_info *relax_info;
5110 relax_info = get_xtensa_relax_info (src_sec);
5111 fix->next = relax_info->fix_list;
5112 relax_info->fix_list = fix;
5117 fix_compare (const void *ap, const void *bp)
5119 const reloc_bfd_fix *a = (const reloc_bfd_fix *) ap;
5120 const reloc_bfd_fix *b = (const reloc_bfd_fix *) bp;
5122 if (a->src_offset != b->src_offset)
5123 return (a->src_offset - b->src_offset);
5124 return (a->src_type - b->src_type);
5129 cache_fix_array (asection *sec)
5131 unsigned i, count = 0;
5133 xtensa_relax_info *relax_info = get_xtensa_relax_info (sec);
5135 if (relax_info == NULL)
5137 if (relax_info->fix_list == NULL)
5140 for (r = relax_info->fix_list; r != NULL; r = r->next)
5143 relax_info->fix_array =
5144 (reloc_bfd_fix *) bfd_malloc (sizeof (reloc_bfd_fix) * count);
5145 relax_info->fix_array_count = count;
5147 r = relax_info->fix_list;
5148 for (i = 0; i < count; i++, r = r->next)
5150 relax_info->fix_array[count - 1 - i] = *r;
5151 relax_info->fix_array[count - 1 - i].next = NULL;
5154 qsort (relax_info->fix_array, relax_info->fix_array_count,
5155 sizeof (reloc_bfd_fix), fix_compare);
5159 static reloc_bfd_fix *
5160 get_bfd_fix (asection *sec, bfd_vma offset, unsigned type)
5162 xtensa_relax_info *relax_info = get_xtensa_relax_info (sec);
5166 if (relax_info == NULL)
5168 if (relax_info->fix_list == NULL)
5171 if (relax_info->fix_array == NULL)
5172 cache_fix_array (sec);
5174 key.src_offset = offset;
5175 key.src_type = type;
5176 rv = bsearch (&key, relax_info->fix_array, relax_info->fix_array_count,
5177 sizeof (reloc_bfd_fix), fix_compare);
5182 /* Section caching. */
5184 typedef struct section_cache_struct section_cache_t;
5186 struct section_cache_struct
5190 bfd_byte *contents; /* Cache of the section contents. */
5191 bfd_size_type content_length;
5193 property_table_entry *ptbl; /* Cache of the section property table. */
5196 Elf_Internal_Rela *relocs; /* Cache of the section relocations. */
5197 unsigned reloc_count;
5202 init_section_cache (section_cache_t *sec_cache)
5204 memset (sec_cache, 0, sizeof (*sec_cache));
5209 clear_section_cache (section_cache_t *sec_cache)
5213 release_contents (sec_cache->sec, sec_cache->contents);
5214 release_internal_relocs (sec_cache->sec, sec_cache->relocs);
5215 if (sec_cache->ptbl)
5216 free (sec_cache->ptbl);
5217 memset (sec_cache, 0, sizeof (sec_cache));
5223 section_cache_section (section_cache_t *sec_cache,
5225 struct bfd_link_info *link_info)
5228 property_table_entry *prop_table = NULL;
5230 bfd_byte *contents = NULL;
5231 Elf_Internal_Rela *internal_relocs = NULL;
5232 bfd_size_type sec_size;
5236 if (sec == sec_cache->sec)
5240 sec_size = bfd_get_section_limit (abfd, sec);
5242 /* Get the contents. */
5243 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
5244 if (contents == NULL && sec_size != 0)
5247 /* Get the relocations. */
5248 internal_relocs = retrieve_internal_relocs (abfd, sec,
5249 link_info->keep_memory);
5251 /* Get the entry table. */
5252 ptblsize = xtensa_read_table_entries (abfd, sec, &prop_table,
5253 XTENSA_PROP_SEC_NAME, FALSE);
5257 /* Fill in the new section cache. */
5258 clear_section_cache (sec_cache);
5259 memset (sec_cache, 0, sizeof (sec_cache));
5261 sec_cache->sec = sec;
5262 sec_cache->contents = contents;
5263 sec_cache->content_length = sec_size;
5264 sec_cache->relocs = internal_relocs;
5265 sec_cache->reloc_count = sec->reloc_count;
5266 sec_cache->pte_count = ptblsize;
5267 sec_cache->ptbl = prop_table;
5272 release_contents (sec, contents);
5273 release_internal_relocs (sec, internal_relocs);
5280 /* Extended basic blocks. */
5282 /* An ebb_struct represents an Extended Basic Block. Within this
5283 range, we guarantee that all instructions are decodable, the
5284 property table entries are contiguous, and no property table
5285 specifies a segment that cannot have instructions moved. This
5286 structure contains caches of the contents, property table and
5287 relocations for the specified section for easy use. The range is
5288 specified by ranges of indices for the byte offset, property table
5289 offsets and relocation offsets. These must be consistent. */
5291 typedef struct ebb_struct ebb_t;
5297 bfd_byte *contents; /* Cache of the section contents. */
5298 bfd_size_type content_length;
5300 property_table_entry *ptbl; /* Cache of the section property table. */
5303 Elf_Internal_Rela *relocs; /* Cache of the section relocations. */
5304 unsigned reloc_count;
5306 bfd_vma start_offset; /* Offset in section. */
5307 unsigned start_ptbl_idx; /* Offset in the property table. */
5308 unsigned start_reloc_idx; /* Offset in the relocations. */
5311 unsigned end_ptbl_idx;
5312 unsigned end_reloc_idx;
5314 bfd_boolean ends_section; /* Is this the last ebb in a section? */
5316 /* The unreachable property table at the end of this set of blocks;
5317 NULL if the end is not an unreachable block. */
5318 property_table_entry *ends_unreachable;
5322 enum ebb_target_enum
5325 EBB_DESIRE_TGT_ALIGN,
5326 EBB_REQUIRE_TGT_ALIGN,
5327 EBB_REQUIRE_LOOP_ALIGN,
5332 /* proposed_action_struct is similar to the text_action_struct except
5333 that is represents a potential transformation, not one that will
5334 occur. We build a list of these for an extended basic block
5335 and use them to compute the actual actions desired. We must be
5336 careful that the entire set of actual actions we perform do not
5337 break any relocations that would fit if the actions were not
5340 typedef struct proposed_action_struct proposed_action;
5342 struct proposed_action_struct
5344 enum ebb_target_enum align_type; /* for the target alignment */
5345 bfd_vma alignment_pow;
5346 text_action_t action;
5349 bfd_boolean do_action; /* If false, then we will not perform the action. */
5353 /* The ebb_constraint_struct keeps a set of proposed actions for an
5354 extended basic block. */
5356 typedef struct ebb_constraint_struct ebb_constraint;
5358 struct ebb_constraint_struct
5361 bfd_boolean start_movable;
5363 /* Bytes of extra space at the beginning if movable. */
5364 int start_extra_space;
5366 enum ebb_target_enum start_align;
5368 bfd_boolean end_movable;
5370 /* Bytes of extra space at the end if movable. */
5371 int end_extra_space;
5373 unsigned action_count;
5374 unsigned action_allocated;
5376 /* Array of proposed actions. */
5377 proposed_action *actions;
5379 /* Action alignments -- one for each proposed action. */
5380 enum ebb_target_enum *action_aligns;
5385 init_ebb_constraint (ebb_constraint *c)
5387 memset (c, 0, sizeof (ebb_constraint));
5392 free_ebb_constraint (ebb_constraint *c)
5400 init_ebb (ebb_t *ebb,
5403 bfd_size_type content_length,
5404 property_table_entry *prop_table,
5406 Elf_Internal_Rela *internal_relocs,
5407 unsigned reloc_count)
5409 memset (ebb, 0, sizeof (ebb_t));
5411 ebb->contents = contents;
5412 ebb->content_length = content_length;
5413 ebb->ptbl = prop_table;
5414 ebb->pte_count = ptblsize;
5415 ebb->relocs = internal_relocs;
5416 ebb->reloc_count = reloc_count;
5417 ebb->start_offset = 0;
5418 ebb->end_offset = ebb->content_length - 1;
5419 ebb->start_ptbl_idx = 0;
5420 ebb->end_ptbl_idx = ptblsize;
5421 ebb->start_reloc_idx = 0;
5422 ebb->end_reloc_idx = reloc_count;
5426 /* Extend the ebb to all decodable contiguous sections. The algorithm
5427 for building a basic block around an instruction is to push it
5428 forward until we hit the end of a section, an unreachable block or
5429 a block that cannot be transformed. Then we push it backwards
5430 searching for similar conditions. */
5432 static bfd_boolean extend_ebb_bounds_forward (ebb_t *);
5433 static bfd_boolean extend_ebb_bounds_backward (ebb_t *);
5434 static bfd_size_type insn_block_decodable_len
5435 (bfd_byte *, bfd_size_type, bfd_vma, bfd_size_type);
5438 extend_ebb_bounds (ebb_t *ebb)
5440 if (!extend_ebb_bounds_forward (ebb))
5442 if (!extend_ebb_bounds_backward (ebb))
5449 extend_ebb_bounds_forward (ebb_t *ebb)
5451 property_table_entry *the_entry, *new_entry;
5453 the_entry = &ebb->ptbl[ebb->end_ptbl_idx];
5455 /* Stop when (1) we cannot decode an instruction, (2) we are at
5456 the end of the property tables, (3) we hit a non-contiguous property
5457 table entry, (4) we hit a NO_TRANSFORM region. */
5462 bfd_size_type insn_block_len;
5464 entry_end = the_entry->address - ebb->sec->vma + the_entry->size;
5466 insn_block_decodable_len (ebb->contents, ebb->content_length,
5468 entry_end - ebb->end_offset);
5469 if (insn_block_len != (entry_end - ebb->end_offset))
5471 (*_bfd_error_handler)
5472 (_("%B(%A+0x%lx): could not decode instruction; possible configuration mismatch"),
5473 ebb->sec->owner, ebb->sec, ebb->end_offset + insn_block_len);
5476 ebb->end_offset += insn_block_len;
5478 if (ebb->end_offset == ebb->sec->size)
5479 ebb->ends_section = TRUE;
5481 /* Update the reloc counter. */
5482 while (ebb->end_reloc_idx + 1 < ebb->reloc_count
5483 && (ebb->relocs[ebb->end_reloc_idx + 1].r_offset
5486 ebb->end_reloc_idx++;
5489 if (ebb->end_ptbl_idx + 1 == ebb->pte_count)
5492 new_entry = &ebb->ptbl[ebb->end_ptbl_idx + 1];
5493 if (((new_entry->flags & XTENSA_PROP_INSN) == 0)
5494 || ((new_entry->flags & XTENSA_PROP_INSN_NO_TRANSFORM) != 0)
5495 || ((the_entry->flags & XTENSA_PROP_ALIGN) != 0))
5498 if (the_entry->address + the_entry->size != new_entry->address)
5501 the_entry = new_entry;
5502 ebb->end_ptbl_idx++;
5505 /* Quick check for an unreachable or end of file just at the end. */
5506 if (ebb->end_ptbl_idx + 1 == ebb->pte_count)
5508 if (ebb->end_offset == ebb->content_length)
5509 ebb->ends_section = TRUE;
5513 new_entry = &ebb->ptbl[ebb->end_ptbl_idx + 1];
5514 if ((new_entry->flags & XTENSA_PROP_UNREACHABLE) != 0
5515 && the_entry->address + the_entry->size == new_entry->address)
5516 ebb->ends_unreachable = new_entry;
5519 /* Any other ending requires exact alignment. */
5525 extend_ebb_bounds_backward (ebb_t *ebb)
5527 property_table_entry *the_entry, *new_entry;
5529 the_entry = &ebb->ptbl[ebb->start_ptbl_idx];
5531 /* Stop when (1) we cannot decode the instructions in the current entry.
5532 (2) we are at the beginning of the property tables, (3) we hit a
5533 non-contiguous property table entry, (4) we hit a NO_TRANSFORM region. */
5537 bfd_vma block_begin;
5538 bfd_size_type insn_block_len;
5540 block_begin = the_entry->address - ebb->sec->vma;
5542 insn_block_decodable_len (ebb->contents, ebb->content_length,
5544 ebb->start_offset - block_begin);
5545 if (insn_block_len != ebb->start_offset - block_begin)
5547 (*_bfd_error_handler)
5548 (_("%B(%A+0x%lx): could not decode instruction; possible configuration mismatch"),
5549 ebb->sec->owner, ebb->sec, ebb->end_offset + insn_block_len);
5552 ebb->start_offset -= insn_block_len;
5554 /* Update the reloc counter. */
5555 while (ebb->start_reloc_idx > 0
5556 && (ebb->relocs[ebb->start_reloc_idx - 1].r_offset
5557 >= ebb->start_offset))
5559 ebb->start_reloc_idx--;
5562 if (ebb->start_ptbl_idx == 0)
5565 new_entry = &ebb->ptbl[ebb->start_ptbl_idx - 1];
5566 if ((new_entry->flags & XTENSA_PROP_INSN) == 0
5567 || ((new_entry->flags & XTENSA_PROP_INSN_NO_TRANSFORM) != 0)
5568 || ((new_entry->flags & XTENSA_PROP_ALIGN) != 0))
5570 if (new_entry->address + new_entry->size != the_entry->address)
5573 the_entry = new_entry;
5574 ebb->start_ptbl_idx--;
5580 static bfd_size_type
5581 insn_block_decodable_len (bfd_byte *contents,
5582 bfd_size_type content_len,
5583 bfd_vma block_offset,
5584 bfd_size_type block_len)
5586 bfd_vma offset = block_offset;
5588 while (offset < block_offset + block_len)
5590 bfd_size_type insn_len = 0;
5592 insn_len = insn_decode_len (contents, content_len, offset);
5594 return (offset - block_offset);
5597 return (offset - block_offset);
5602 ebb_propose_action (ebb_constraint *c,
5603 enum ebb_target_enum align_type,
5604 bfd_vma alignment_pow,
5605 text_action_t action,
5608 bfd_boolean do_action)
5610 proposed_action *act;
5612 if (c->action_allocated <= c->action_count)
5614 unsigned new_allocated, i;
5615 proposed_action *new_actions;
5617 new_allocated = (c->action_count + 2) * 2;
5618 new_actions = (proposed_action *)
5619 bfd_zmalloc (sizeof (proposed_action) * new_allocated);
5621 for (i = 0; i < c->action_count; i++)
5622 new_actions[i] = c->actions[i];
5625 c->actions = new_actions;
5626 c->action_allocated = new_allocated;
5629 act = &c->actions[c->action_count];
5630 act->align_type = align_type;
5631 act->alignment_pow = alignment_pow;
5632 act->action = action;
5633 act->offset = offset;
5634 act->removed_bytes = removed_bytes;
5635 act->do_action = do_action;
5641 /* Access to internal relocations, section contents and symbols. */
5643 /* During relaxation, we need to modify relocations, section contents,
5644 and symbol definitions, and we need to keep the original values from
5645 being reloaded from the input files, i.e., we need to "pin" the
5646 modified values in memory. We also want to continue to observe the
5647 setting of the "keep-memory" flag. The following functions wrap the
5648 standard BFD functions to take care of this for us. */
5650 static Elf_Internal_Rela *
5651 retrieve_internal_relocs (bfd *abfd, asection *sec, bfd_boolean keep_memory)
5653 Elf_Internal_Rela *internal_relocs;
5655 if ((sec->flags & SEC_LINKER_CREATED) != 0)
5658 internal_relocs = elf_section_data (sec)->relocs;
5659 if (internal_relocs == NULL)
5660 internal_relocs = (_bfd_elf_link_read_relocs
5661 (abfd, sec, NULL, NULL, keep_memory));
5662 return internal_relocs;
5667 pin_internal_relocs (asection *sec, Elf_Internal_Rela *internal_relocs)
5669 elf_section_data (sec)->relocs = internal_relocs;
5674 release_internal_relocs (asection *sec, Elf_Internal_Rela *internal_relocs)
5677 && elf_section_data (sec)->relocs != internal_relocs)
5678 free (internal_relocs);
5683 retrieve_contents (bfd *abfd, asection *sec, bfd_boolean keep_memory)
5686 bfd_size_type sec_size;
5688 sec_size = bfd_get_section_limit (abfd, sec);
5689 contents = elf_section_data (sec)->this_hdr.contents;
5691 if (contents == NULL && sec_size != 0)
5693 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
5700 elf_section_data (sec)->this_hdr.contents = contents;
5707 pin_contents (asection *sec, bfd_byte *contents)
5709 elf_section_data (sec)->this_hdr.contents = contents;
5714 release_contents (asection *sec, bfd_byte *contents)
5716 if (contents && elf_section_data (sec)->this_hdr.contents != contents)
5721 static Elf_Internal_Sym *
5722 retrieve_local_syms (bfd *input_bfd)
5724 Elf_Internal_Shdr *symtab_hdr;
5725 Elf_Internal_Sym *isymbuf;
5728 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
5729 locsymcount = symtab_hdr->sh_info;
5731 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
5732 if (isymbuf == NULL && locsymcount != 0)
5733 isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, locsymcount, 0,
5736 /* Save the symbols for this input file so they won't be read again. */
5737 if (isymbuf && isymbuf != (Elf_Internal_Sym *) symtab_hdr->contents)
5738 symtab_hdr->contents = (unsigned char *) isymbuf;
5744 /* Code for link-time relaxation. */
5746 /* Initialization for relaxation: */
5747 static bfd_boolean analyze_relocations (struct bfd_link_info *);
5748 static bfd_boolean find_relaxable_sections
5749 (bfd *, asection *, struct bfd_link_info *, bfd_boolean *);
5750 static bfd_boolean collect_source_relocs
5751 (bfd *, asection *, struct bfd_link_info *);
5752 static bfd_boolean is_resolvable_asm_expansion
5753 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, struct bfd_link_info *,
5755 static Elf_Internal_Rela *find_associated_l32r_irel
5756 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, Elf_Internal_Rela *);
5757 static bfd_boolean compute_text_actions
5758 (bfd *, asection *, struct bfd_link_info *);
5759 static bfd_boolean compute_ebb_proposed_actions (ebb_constraint *);
5760 static bfd_boolean compute_ebb_actions (ebb_constraint *);
5761 static bfd_boolean check_section_ebb_pcrels_fit
5762 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, const ebb_constraint *);
5763 static bfd_boolean check_section_ebb_reduces (const ebb_constraint *);
5764 static void text_action_add_proposed
5765 (text_action_list *, const ebb_constraint *, asection *);
5766 static int compute_fill_extra_space (property_table_entry *);
5769 static bfd_boolean compute_removed_literals
5770 (bfd *, asection *, struct bfd_link_info *, value_map_hash_table *);
5771 static Elf_Internal_Rela *get_irel_at_offset
5772 (asection *, Elf_Internal_Rela *, bfd_vma);
5773 static bfd_boolean is_removable_literal
5774 (const source_reloc *, int, const source_reloc *, int);
5775 static bfd_boolean remove_dead_literal
5776 (bfd *, asection *, struct bfd_link_info *, Elf_Internal_Rela *,
5777 Elf_Internal_Rela *, source_reloc *, property_table_entry *, int);
5778 static bfd_boolean identify_literal_placement
5779 (bfd *, asection *, bfd_byte *, struct bfd_link_info *,
5780 value_map_hash_table *, bfd_boolean *, Elf_Internal_Rela *, int,
5781 source_reloc *, property_table_entry *, int, section_cache_t *,
5783 static bfd_boolean relocations_reach (source_reloc *, int, const r_reloc *);
5784 static bfd_boolean coalesce_shared_literal
5785 (asection *, source_reloc *, property_table_entry *, int, value_map *);
5786 static bfd_boolean move_shared_literal
5787 (asection *, struct bfd_link_info *, source_reloc *, property_table_entry *,
5788 int, const r_reloc *, const literal_value *, section_cache_t *);
5791 static bfd_boolean relax_section (bfd *, asection *, struct bfd_link_info *);
5792 static bfd_boolean translate_section_fixes (asection *);
5793 static bfd_boolean translate_reloc_bfd_fix (reloc_bfd_fix *);
5794 static void translate_reloc (const r_reloc *, r_reloc *);
5795 static void shrink_dynamic_reloc_sections
5796 (struct bfd_link_info *, bfd *, asection *, Elf_Internal_Rela *);
5797 static bfd_boolean move_literal
5798 (bfd *, struct bfd_link_info *, asection *, bfd_vma, bfd_byte *,
5799 xtensa_relax_info *, Elf_Internal_Rela **, const literal_value *);
5800 static bfd_boolean relax_property_section
5801 (bfd *, asection *, struct bfd_link_info *);
5804 static bfd_boolean relax_section_symbols (bfd *, asection *);
5808 elf_xtensa_relax_section (bfd *abfd,
5810 struct bfd_link_info *link_info,
5813 static value_map_hash_table *values = NULL;
5814 static bfd_boolean relocations_analyzed = FALSE;
5815 xtensa_relax_info *relax_info;
5817 if (!relocations_analyzed)
5819 /* Do some overall initialization for relaxation. */
5820 values = value_map_hash_table_init ();
5823 relaxing_section = TRUE;
5824 if (!analyze_relocations (link_info))
5826 relocations_analyzed = TRUE;
5830 /* Don't mess with linker-created sections. */
5831 if ((sec->flags & SEC_LINKER_CREATED) != 0)
5834 relax_info = get_xtensa_relax_info (sec);
5835 BFD_ASSERT (relax_info != NULL);
5837 switch (relax_info->visited)
5840 /* Note: It would be nice to fold this pass into
5841 analyze_relocations, but it is important for this step that the
5842 sections be examined in link order. */
5843 if (!compute_removed_literals (abfd, sec, link_info, values))
5850 value_map_hash_table_delete (values);
5852 if (!relax_section (abfd, sec, link_info))
5858 if (!relax_section_symbols (abfd, sec))
5863 relax_info->visited++;
5868 /* Initialization for relaxation. */
5870 /* This function is called once at the start of relaxation. It scans
5871 all the input sections and marks the ones that are relaxable (i.e.,
5872 literal sections with L32R relocations against them), and then
5873 collects source_reloc information for all the relocations against
5874 those relaxable sections. During this process, it also detects
5875 longcalls, i.e., calls relaxed by the assembler into indirect
5876 calls, that can be optimized back into direct calls. Within each
5877 extended basic block (ebb) containing an optimized longcall, it
5878 computes a set of "text actions" that can be performed to remove
5879 the L32R associated with the longcall while optionally preserving
5880 branch target alignments. */
5883 analyze_relocations (struct bfd_link_info *link_info)
5887 bfd_boolean is_relaxable = FALSE;
5889 /* Initialize the per-section relaxation info. */
5890 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next)
5891 for (sec = abfd->sections; sec != NULL; sec = sec->next)
5893 init_xtensa_relax_info (sec);
5896 /* Mark relaxable sections (and count relocations against each one). */
5897 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next)
5898 for (sec = abfd->sections; sec != NULL; sec = sec->next)
5900 if (!find_relaxable_sections (abfd, sec, link_info, &is_relaxable))
5904 /* Bail out if there are no relaxable sections. */
5908 /* Allocate space for source_relocs. */
5909 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next)
5910 for (sec = abfd->sections; sec != NULL; sec = sec->next)
5912 xtensa_relax_info *relax_info;
5914 relax_info = get_xtensa_relax_info (sec);
5915 if (relax_info->is_relaxable_literal_section
5916 || relax_info->is_relaxable_asm_section)
5918 relax_info->src_relocs = (source_reloc *)
5919 bfd_malloc (relax_info->src_count * sizeof (source_reloc));
5923 /* Collect info on relocations against each relaxable section. */
5924 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next)
5925 for (sec = abfd->sections; sec != NULL; sec = sec->next)
5927 if (!collect_source_relocs (abfd, sec, link_info))
5931 /* Compute the text actions. */
5932 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next)
5933 for (sec = abfd->sections; sec != NULL; sec = sec->next)
5935 if (!compute_text_actions (abfd, sec, link_info))
5943 /* Find all the sections that might be relaxed. The motivation for
5944 this pass is that collect_source_relocs() needs to record _all_ the
5945 relocations that target each relaxable section. That is expensive
5946 and unnecessary unless the target section is actually going to be
5947 relaxed. This pass identifies all such sections by checking if
5948 they have L32Rs pointing to them. In the process, the total number
5949 of relocations targeting each section is also counted so that we
5950 know how much space to allocate for source_relocs against each
5951 relaxable literal section. */
5954 find_relaxable_sections (bfd *abfd,
5956 struct bfd_link_info *link_info,
5957 bfd_boolean *is_relaxable_p)
5959 Elf_Internal_Rela *internal_relocs;
5961 bfd_boolean ok = TRUE;
5963 xtensa_relax_info *source_relax_info;
5965 internal_relocs = retrieve_internal_relocs (abfd, sec,
5966 link_info->keep_memory);
5967 if (internal_relocs == NULL)
5970 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
5971 if (contents == NULL && sec->size != 0)
5977 source_relax_info = get_xtensa_relax_info (sec);
5978 for (i = 0; i < sec->reloc_count; i++)
5980 Elf_Internal_Rela *irel = &internal_relocs[i];
5982 asection *target_sec;
5983 xtensa_relax_info *target_relax_info;
5985 /* If this section has not already been marked as "relaxable", and
5986 if it contains any ASM_EXPAND relocations (marking expanded
5987 longcalls) that can be optimized into direct calls, then mark
5988 the section as "relaxable". */
5989 if (source_relax_info
5990 && !source_relax_info->is_relaxable_asm_section
5991 && ELF32_R_TYPE (irel->r_info) == R_XTENSA_ASM_EXPAND)
5993 bfd_boolean is_reachable = FALSE;
5994 if (is_resolvable_asm_expansion (abfd, sec, contents, irel,
5995 link_info, &is_reachable)
5998 source_relax_info->is_relaxable_asm_section = TRUE;
5999 *is_relaxable_p = TRUE;
6003 r_reloc_init (&r_rel, abfd, irel, contents,
6004 bfd_get_section_limit (abfd, sec));
6006 target_sec = r_reloc_get_section (&r_rel);
6007 target_relax_info = get_xtensa_relax_info (target_sec);
6008 if (!target_relax_info)
6011 /* Count PC-relative operand relocations against the target section.
6012 Note: The conditions tested here must match the conditions under
6013 which init_source_reloc is called in collect_source_relocs(). */
6014 if (is_operand_relocation (ELF32_R_TYPE (irel->r_info))
6015 && (!is_alt_relocation (ELF32_R_TYPE (irel->r_info))
6016 || is_l32r_relocation (abfd, sec, contents, irel)))
6017 target_relax_info->src_count++;
6019 if (is_l32r_relocation (abfd, sec, contents, irel)
6020 && r_reloc_is_defined (&r_rel))
6022 /* Mark the target section as relaxable. */
6023 target_relax_info->is_relaxable_literal_section = TRUE;
6024 *is_relaxable_p = TRUE;
6029 release_contents (sec, contents);
6030 release_internal_relocs (sec, internal_relocs);
6035 /* Record _all_ the relocations that point to relaxable sections, and
6036 get rid of ASM_EXPAND relocs by either converting them to
6037 ASM_SIMPLIFY or by removing them. */
6040 collect_source_relocs (bfd *abfd,
6042 struct bfd_link_info *link_info)
6044 Elf_Internal_Rela *internal_relocs;
6046 bfd_boolean ok = TRUE;
6048 bfd_size_type sec_size;
6050 internal_relocs = retrieve_internal_relocs (abfd, sec,
6051 link_info->keep_memory);
6052 if (internal_relocs == NULL)
6055 sec_size = bfd_get_section_limit (abfd, sec);
6056 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
6057 if (contents == NULL && sec_size != 0)
6063 /* Record relocations against relaxable literal sections. */
6064 for (i = 0; i < sec->reloc_count; i++)
6066 Elf_Internal_Rela *irel = &internal_relocs[i];
6068 asection *target_sec;
6069 xtensa_relax_info *target_relax_info;
6071 r_reloc_init (&r_rel, abfd, irel, contents, sec_size);
6073 target_sec = r_reloc_get_section (&r_rel);
6074 target_relax_info = get_xtensa_relax_info (target_sec);
6076 if (target_relax_info
6077 && (target_relax_info->is_relaxable_literal_section
6078 || target_relax_info->is_relaxable_asm_section))
6080 xtensa_opcode opcode = XTENSA_UNDEFINED;
6082 bfd_boolean is_abs_literal = FALSE;
6084 if (is_alt_relocation (ELF32_R_TYPE (irel->r_info)))
6086 /* None of the current alternate relocs are PC-relative,
6087 and only PC-relative relocs matter here. However, we
6088 still need to record the opcode for literal
6090 opcode = get_relocation_opcode (abfd, sec, contents, irel);
6091 if (opcode == get_l32r_opcode ())
6093 is_abs_literal = TRUE;
6097 opcode = XTENSA_UNDEFINED;
6099 else if (is_operand_relocation (ELF32_R_TYPE (irel->r_info)))
6101 opcode = get_relocation_opcode (abfd, sec, contents, irel);
6102 opnd = get_relocation_opnd (opcode, ELF32_R_TYPE (irel->r_info));
6105 if (opcode != XTENSA_UNDEFINED)
6107 int src_next = target_relax_info->src_next++;
6108 source_reloc *s_reloc = &target_relax_info->src_relocs[src_next];
6110 init_source_reloc (s_reloc, sec, &r_rel, opcode, opnd,
6116 /* Now get rid of ASM_EXPAND relocations. At this point, the
6117 src_relocs array for the target literal section may still be
6118 incomplete, but it must at least contain the entries for the L32R
6119 relocations associated with ASM_EXPANDs because they were just
6120 added in the preceding loop over the relocations. */
6122 for (i = 0; i < sec->reloc_count; i++)
6124 Elf_Internal_Rela *irel = &internal_relocs[i];
6125 bfd_boolean is_reachable;
6127 if (!is_resolvable_asm_expansion (abfd, sec, contents, irel, link_info,
6133 Elf_Internal_Rela *l32r_irel;
6135 asection *target_sec;
6136 xtensa_relax_info *target_relax_info;
6138 /* Mark the source_reloc for the L32R so that it will be
6139 removed in compute_removed_literals(), along with the
6140 associated literal. */
6141 l32r_irel = find_associated_l32r_irel (abfd, sec, contents,
6142 irel, internal_relocs);
6143 if (l32r_irel == NULL)
6146 r_reloc_init (&r_rel, abfd, l32r_irel, contents, sec_size);
6148 target_sec = r_reloc_get_section (&r_rel);
6149 target_relax_info = get_xtensa_relax_info (target_sec);
6151 if (target_relax_info
6152 && (target_relax_info->is_relaxable_literal_section
6153 || target_relax_info->is_relaxable_asm_section))
6155 source_reloc *s_reloc;
6157 /* Search the source_relocs for the entry corresponding to
6158 the l32r_irel. Note: The src_relocs array is not yet
6159 sorted, but it wouldn't matter anyway because we're
6160 searching by source offset instead of target offset. */
6161 s_reloc = find_source_reloc (target_relax_info->src_relocs,
6162 target_relax_info->src_next,
6164 BFD_ASSERT (s_reloc);
6165 s_reloc->is_null = TRUE;
6168 /* Convert this reloc to ASM_SIMPLIFY. */
6169 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
6170 R_XTENSA_ASM_SIMPLIFY);
6171 l32r_irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
6173 pin_internal_relocs (sec, internal_relocs);
6177 /* It is resolvable but doesn't reach. We resolve now
6178 by eliminating the relocation -- the call will remain
6179 expanded into L32R/CALLX. */
6180 irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
6181 pin_internal_relocs (sec, internal_relocs);
6186 release_contents (sec, contents);
6187 release_internal_relocs (sec, internal_relocs);
6192 /* Return TRUE if the asm expansion can be resolved. Generally it can
6193 be resolved on a final link or when a partial link locates it in the
6194 same section as the target. Set "is_reachable" flag if the target of
6195 the call is within the range of a direct call, given the current VMA
6196 for this section and the target section. */
6199 is_resolvable_asm_expansion (bfd *abfd,
6202 Elf_Internal_Rela *irel,
6203 struct bfd_link_info *link_info,
6204 bfd_boolean *is_reachable_p)
6206 asection *target_sec;
6207 bfd_vma target_offset;
6209 xtensa_opcode opcode, direct_call_opcode;
6210 bfd_vma self_address;
6211 bfd_vma dest_address;
6212 bfd_boolean uses_l32r;
6213 bfd_size_type sec_size;
6215 *is_reachable_p = FALSE;
6217 if (contents == NULL)
6220 if (ELF32_R_TYPE (irel->r_info) != R_XTENSA_ASM_EXPAND)
6223 sec_size = bfd_get_section_limit (abfd, sec);
6224 opcode = get_expanded_call_opcode (contents + irel->r_offset,
6225 sec_size - irel->r_offset, &uses_l32r);
6226 /* Optimization of longcalls that use CONST16 is not yet implemented. */
6230 direct_call_opcode = swap_callx_for_call_opcode (opcode);
6231 if (direct_call_opcode == XTENSA_UNDEFINED)
6234 /* Check and see that the target resolves. */
6235 r_reloc_init (&r_rel, abfd, irel, contents, sec_size);
6236 if (!r_reloc_is_defined (&r_rel))
6239 target_sec = r_reloc_get_section (&r_rel);
6240 target_offset = r_rel.target_offset;
6242 /* If the target is in a shared library, then it doesn't reach. This
6243 isn't supposed to come up because the compiler should never generate
6244 non-PIC calls on systems that use shared libraries, but the linker
6245 shouldn't crash regardless. */
6246 if (!target_sec->output_section)
6249 /* For relocatable sections, we can only simplify when the output
6250 section of the target is the same as the output section of the
6252 if (link_info->relocatable
6253 && (target_sec->output_section != sec->output_section
6254 || is_reloc_sym_weak (abfd, irel)))
6257 self_address = (sec->output_section->vma
6258 + sec->output_offset + irel->r_offset + 3);
6259 dest_address = (target_sec->output_section->vma
6260 + target_sec->output_offset + target_offset);
6262 *is_reachable_p = pcrel_reloc_fits (direct_call_opcode, 0,
6263 self_address, dest_address);
6265 if ((self_address >> CALL_SEGMENT_BITS) !=
6266 (dest_address >> CALL_SEGMENT_BITS))
6273 static Elf_Internal_Rela *
6274 find_associated_l32r_irel (bfd *abfd,
6277 Elf_Internal_Rela *other_irel,
6278 Elf_Internal_Rela *internal_relocs)
6282 for (i = 0; i < sec->reloc_count; i++)
6284 Elf_Internal_Rela *irel = &internal_relocs[i];
6286 if (irel == other_irel)
6288 if (irel->r_offset != other_irel->r_offset)
6290 if (is_l32r_relocation (abfd, sec, contents, irel))
6298 /* The compute_text_actions function will build a list of potential
6299 transformation actions for code in the extended basic block of each
6300 longcall that is optimized to a direct call. From this list we
6301 generate a set of actions to actually perform that optimizes for
6302 space and, if not using size_opt, maintains branch target
6305 These actions to be performed are placed on a per-section list.
6306 The actual changes are performed by relax_section() in the second
6310 compute_text_actions (bfd *abfd,
6312 struct bfd_link_info *link_info)
6314 xtensa_relax_info *relax_info;
6316 Elf_Internal_Rela *internal_relocs;
6317 bfd_boolean ok = TRUE;
6319 property_table_entry *prop_table = 0;
6321 bfd_size_type sec_size;
6322 static bfd_boolean no_insn_move = FALSE;
6327 /* Do nothing if the section contains no optimized longcalls. */
6328 relax_info = get_xtensa_relax_info (sec);
6329 BFD_ASSERT (relax_info);
6330 if (!relax_info->is_relaxable_asm_section)
6333 internal_relocs = retrieve_internal_relocs (abfd, sec,
6334 link_info->keep_memory);
6336 if (internal_relocs)
6337 qsort (internal_relocs, sec->reloc_count, sizeof (Elf_Internal_Rela),
6338 internal_reloc_compare);
6340 sec_size = bfd_get_section_limit (abfd, sec);
6341 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
6342 if (contents == NULL && sec_size != 0)
6348 ptblsize = xtensa_read_table_entries (abfd, sec, &prop_table,
6349 XTENSA_PROP_SEC_NAME, FALSE);
6356 for (i = 0; i < sec->reloc_count; i++)
6358 Elf_Internal_Rela *irel = &internal_relocs[i];
6360 property_table_entry *the_entry;
6363 ebb_constraint ebb_table;
6364 bfd_size_type simplify_size;
6366 if (irel && ELF32_R_TYPE (irel->r_info) != R_XTENSA_ASM_SIMPLIFY)
6368 r_offset = irel->r_offset;
6370 simplify_size = get_asm_simplify_size (contents, sec_size, r_offset);
6371 if (simplify_size == 0)
6373 (*_bfd_error_handler)
6374 (_("%B(%A+0x%lx): could not decode instruction for XTENSA_ASM_SIMPLIFY relocation; possible configuration mismatch"),
6375 sec->owner, sec, r_offset);
6379 /* If the instruction table is not around, then don't do this
6381 the_entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
6382 sec->vma + irel->r_offset);
6383 if (the_entry == NULL || XTENSA_NO_NOP_REMOVAL)
6385 text_action_add (&relax_info->action_list,
6386 ta_convert_longcall, sec, r_offset,
6391 /* If the next longcall happens to be at the same address as an
6392 unreachable section of size 0, then skip forward. */
6393 ptbl_idx = the_entry - prop_table;
6394 while ((the_entry->flags & XTENSA_PROP_UNREACHABLE)
6395 && the_entry->size == 0
6396 && ptbl_idx + 1 < ptblsize
6397 && (prop_table[ptbl_idx + 1].address
6398 == prop_table[ptbl_idx].address))
6404 if (the_entry->flags & XTENSA_PROP_INSN_NO_TRANSFORM)
6405 /* NO_REORDER is OK */
6408 init_ebb_constraint (&ebb_table);
6409 ebb = &ebb_table.ebb;
6410 init_ebb (ebb, sec, contents, sec_size, prop_table, ptblsize,
6411 internal_relocs, sec->reloc_count);
6412 ebb->start_offset = r_offset + simplify_size;
6413 ebb->end_offset = r_offset + simplify_size;
6414 ebb->start_ptbl_idx = ptbl_idx;
6415 ebb->end_ptbl_idx = ptbl_idx;
6416 ebb->start_reloc_idx = i;
6417 ebb->end_reloc_idx = i;
6419 if (!extend_ebb_bounds (ebb)
6420 || !compute_ebb_proposed_actions (&ebb_table)
6421 || !compute_ebb_actions (&ebb_table)
6422 || !check_section_ebb_pcrels_fit (abfd, sec, contents,
6423 internal_relocs, &ebb_table)
6424 || !check_section_ebb_reduces (&ebb_table))
6426 /* If anything goes wrong or we get unlucky and something does
6427 not fit, with our plan because of expansion between
6428 critical branches, just convert to a NOP. */
6430 text_action_add (&relax_info->action_list,
6431 ta_convert_longcall, sec, r_offset, 0);
6432 i = ebb_table.ebb.end_reloc_idx;
6433 free_ebb_constraint (&ebb_table);
6437 text_action_add_proposed (&relax_info->action_list, &ebb_table, sec);
6439 /* Update the index so we do not go looking at the relocations
6440 we have already processed. */
6441 i = ebb_table.ebb.end_reloc_idx;
6442 free_ebb_constraint (&ebb_table);
6446 if (relax_info->action_list.head)
6447 print_action_list (stderr, &relax_info->action_list);
6451 release_contents (sec, contents);
6452 release_internal_relocs (sec, internal_relocs);
6460 /* Find all of the possible actions for an extended basic block. */
6463 compute_ebb_proposed_actions (ebb_constraint *ebb_table)
6465 const ebb_t *ebb = &ebb_table->ebb;
6466 unsigned rel_idx = ebb->start_reloc_idx;
6467 property_table_entry *entry, *start_entry, *end_entry;
6469 start_entry = &ebb->ptbl[ebb->start_ptbl_idx];
6470 end_entry = &ebb->ptbl[ebb->end_ptbl_idx];
6472 for (entry = start_entry; entry <= end_entry; entry++)
6474 bfd_vma offset, start_offset, end_offset;
6475 bfd_size_type insn_len;
6477 start_offset = entry->address - ebb->sec->vma;
6478 end_offset = entry->address + entry->size - ebb->sec->vma;
6480 if (entry == start_entry)
6481 start_offset = ebb->start_offset;
6482 if (entry == end_entry)
6483 end_offset = ebb->end_offset;
6484 offset = start_offset;
6486 if (offset == entry->address - ebb->sec->vma
6487 && (entry->flags & XTENSA_PROP_INSN_BRANCH_TARGET) != 0)
6489 enum ebb_target_enum align_type = EBB_DESIRE_TGT_ALIGN;
6490 BFD_ASSERT (offset != end_offset);
6491 if (offset == end_offset)
6494 insn_len = insn_decode_len (ebb->contents, ebb->content_length,
6497 /* Propose no actions for a section with an undecodable offset. */
6500 (*_bfd_error_handler)
6501 (_("%B(%A+0x%lx): could not decode instruction; possible configuration mismatch"),
6502 ebb->sec->owner, ebb->sec, offset);
6505 if (check_branch_target_aligned_address (offset, insn_len))
6506 align_type = EBB_REQUIRE_TGT_ALIGN;
6508 ebb_propose_action (ebb_table, align_type, 0,
6509 ta_none, offset, 0, TRUE);
6512 while (offset != end_offset)
6514 Elf_Internal_Rela *irel;
6515 xtensa_opcode opcode;
6517 while (rel_idx < ebb->end_reloc_idx
6518 && (ebb->relocs[rel_idx].r_offset < offset
6519 || (ebb->relocs[rel_idx].r_offset == offset
6520 && (ELF32_R_TYPE (ebb->relocs[rel_idx].r_info)
6521 != R_XTENSA_ASM_SIMPLIFY))))
6524 /* Check for longcall. */
6525 irel = &ebb->relocs[rel_idx];
6526 if (irel->r_offset == offset
6527 && ELF32_R_TYPE (irel->r_info) == R_XTENSA_ASM_SIMPLIFY)
6529 bfd_size_type simplify_size;
6531 simplify_size = get_asm_simplify_size (ebb->contents,
6532 ebb->content_length,
6534 if (simplify_size == 0)
6536 (*_bfd_error_handler)
6537 (_("%B(%A+0x%lx): could not decode instruction for XTENSA_ASM_SIMPLIFY relocation; possible configuration mismatch"),
6538 ebb->sec->owner, ebb->sec, offset);
6542 ebb_propose_action (ebb_table, EBB_NO_ALIGN, 0,
6543 ta_convert_longcall, offset, 0, TRUE);
6545 offset += simplify_size;
6549 insn_len = insn_decode_len (ebb->contents, ebb->content_length,
6551 /* If the instruction is undecodable, then report an error. */
6554 (*_bfd_error_handler)
6555 (_("%B(%A+0x%lx): could not decode instruction; possible configuration mismatch"),
6556 ebb->sec->owner, ebb->sec, offset);
6560 if ((entry->flags & XTENSA_PROP_INSN_NO_DENSITY) == 0
6561 && (entry->flags & XTENSA_PROP_INSN_NO_TRANSFORM) == 0
6562 && narrow_instruction (ebb->contents, ebb->content_length,
6565 /* Add an instruction narrow action. */
6566 ebb_propose_action (ebb_table, EBB_NO_ALIGN, 0,
6567 ta_narrow_insn, offset, 0, FALSE);
6571 if ((entry->flags & XTENSA_PROP_INSN_NO_TRANSFORM) == 0
6572 && widen_instruction (ebb->contents, ebb->content_length,
6575 /* Add an instruction widen action. */
6576 ebb_propose_action (ebb_table, EBB_NO_ALIGN, 0,
6577 ta_widen_insn, offset, 0, FALSE);
6581 opcode = insn_decode_opcode (ebb->contents, ebb->content_length,
6583 if (xtensa_opcode_is_loop (xtensa_default_isa, opcode))
6585 /* Check for branch targets. */
6586 ebb_propose_action (ebb_table, EBB_REQUIRE_LOOP_ALIGN, 0,
6587 ta_none, offset, 0, TRUE);
6596 if (ebb->ends_unreachable)
6598 ebb_propose_action (ebb_table, EBB_NO_ALIGN, 0,
6599 ta_fill, ebb->end_offset, 0, TRUE);
6606 /* After all of the information has collected about the
6607 transformations possible in an EBB, compute the appropriate actions
6608 here in compute_ebb_actions. We still must check later to make
6609 sure that the actions do not break any relocations. The algorithm
6610 used here is pretty greedy. Basically, it removes as many no-ops
6611 as possible so that the end of the EBB has the same alignment
6612 characteristics as the original. First, it uses narrowing, then
6613 fill space at the end of the EBB, and finally widenings. If that
6614 does not work, it tries again with one fewer no-op removed. The
6615 optimization will only be performed if all of the branch targets
6616 that were aligned before transformation are also aligned after the
6619 When the size_opt flag is set, ignore the branch target alignments,
6620 narrow all wide instructions, and remove all no-ops unless the end
6621 of the EBB prevents it. */
6624 compute_ebb_actions (ebb_constraint *ebb_table)
6628 int removed_bytes = 0;
6629 ebb_t *ebb = &ebb_table->ebb;
6630 unsigned seg_idx_start = 0;
6631 unsigned seg_idx_end = 0;
6633 /* We perform this like the assembler relaxation algorithm: Start by
6634 assuming all instructions are narrow and all no-ops removed; then
6637 /* For each segment of this that has a solid constraint, check to
6638 see if there are any combinations that will keep the constraint.
6640 for (seg_idx_end = 0; seg_idx_end < ebb_table->action_count; seg_idx_end++)
6642 bfd_boolean requires_text_end_align = FALSE;
6643 unsigned longcall_count = 0;
6644 unsigned longcall_convert_count = 0;
6645 unsigned narrowable_count = 0;
6646 unsigned narrowable_convert_count = 0;
6647 unsigned widenable_count = 0;
6648 unsigned widenable_convert_count = 0;
6650 proposed_action *action = NULL;
6651 int align = (1 << ebb_table->ebb.sec->alignment_power);
6653 seg_idx_start = seg_idx_end;
6655 for (i = seg_idx_start; i < ebb_table->action_count; i++)
6657 action = &ebb_table->actions[i];
6658 if (action->action == ta_convert_longcall)
6660 if (action->action == ta_narrow_insn)
6662 if (action->action == ta_widen_insn)
6664 if (action->action == ta_fill)
6666 if (action->align_type == EBB_REQUIRE_LOOP_ALIGN)
6668 if (action->align_type == EBB_REQUIRE_TGT_ALIGN
6669 && !elf32xtensa_size_opt)
6674 if (seg_idx_end == ebb_table->action_count && !ebb->ends_unreachable)
6675 requires_text_end_align = TRUE;
6677 if (elf32xtensa_size_opt && !requires_text_end_align
6678 && action->align_type != EBB_REQUIRE_LOOP_ALIGN
6679 && action->align_type != EBB_REQUIRE_TGT_ALIGN)
6681 longcall_convert_count = longcall_count;
6682 narrowable_convert_count = narrowable_count;
6683 widenable_convert_count = 0;
6687 /* There is a constraint. Convert the max number of longcalls. */
6688 narrowable_convert_count = 0;
6689 longcall_convert_count = 0;
6690 widenable_convert_count = 0;
6692 for (j = 0; j < longcall_count; j++)
6694 int removed = (longcall_count - j) * 3 & (align - 1);
6695 unsigned desire_narrow = (align - removed) & (align - 1);
6696 unsigned desire_widen = removed;
6697 if (desire_narrow <= narrowable_count)
6699 narrowable_convert_count = desire_narrow;
6700 narrowable_convert_count +=
6701 (align * ((narrowable_count - narrowable_convert_count)
6703 longcall_convert_count = (longcall_count - j);
6704 widenable_convert_count = 0;
6707 if (desire_widen <= widenable_count && !elf32xtensa_size_opt)
6709 narrowable_convert_count = 0;
6710 longcall_convert_count = longcall_count - j;
6711 widenable_convert_count = desire_widen;
6717 /* Now the number of conversions are saved. Do them. */
6718 for (i = seg_idx_start; i < seg_idx_end; i++)
6720 action = &ebb_table->actions[i];
6721 switch (action->action)
6723 case ta_convert_longcall:
6724 if (longcall_convert_count != 0)
6726 action->action = ta_remove_longcall;
6727 action->do_action = TRUE;
6728 action->removed_bytes += 3;
6729 longcall_convert_count--;
6732 case ta_narrow_insn:
6733 if (narrowable_convert_count != 0)
6735 action->do_action = TRUE;
6736 action->removed_bytes += 1;
6737 narrowable_convert_count--;
6741 if (widenable_convert_count != 0)
6743 action->do_action = TRUE;
6744 action->removed_bytes -= 1;
6745 widenable_convert_count--;
6754 /* Now we move on to some local opts. Try to remove each of the
6755 remaining longcalls. */
6757 if (ebb_table->ebb.ends_section || ebb_table->ebb.ends_unreachable)
6760 for (i = 0; i < ebb_table->action_count; i++)
6762 int old_removed_bytes = removed_bytes;
6763 proposed_action *action = &ebb_table->actions[i];
6765 if (action->do_action && action->action == ta_convert_longcall)
6767 bfd_boolean bad_alignment = FALSE;
6769 for (j = i + 1; j < ebb_table->action_count; j++)
6771 proposed_action *new_action = &ebb_table->actions[j];
6772 bfd_vma offset = new_action->offset;
6773 if (new_action->align_type == EBB_REQUIRE_TGT_ALIGN)
6775 if (!check_branch_target_aligned
6776 (ebb_table->ebb.contents,
6777 ebb_table->ebb.content_length,
6778 offset, offset - removed_bytes))
6780 bad_alignment = TRUE;
6784 if (new_action->align_type == EBB_REQUIRE_LOOP_ALIGN)
6786 if (!check_loop_aligned (ebb_table->ebb.contents,
6787 ebb_table->ebb.content_length,
6789 offset - removed_bytes))
6791 bad_alignment = TRUE;
6795 if (new_action->action == ta_narrow_insn
6796 && !new_action->do_action
6797 && ebb_table->ebb.sec->alignment_power == 2)
6799 /* Narrow an instruction and we are done. */
6800 new_action->do_action = TRUE;
6801 new_action->removed_bytes += 1;
6802 bad_alignment = FALSE;
6805 if (new_action->action == ta_widen_insn
6806 && new_action->do_action
6807 && ebb_table->ebb.sec->alignment_power == 2)
6809 /* Narrow an instruction and we are done. */
6810 new_action->do_action = FALSE;
6811 new_action->removed_bytes += 1;
6812 bad_alignment = FALSE;
6818 action->removed_bytes += 3;
6819 action->action = ta_remove_longcall;
6820 action->do_action = TRUE;
6823 removed_bytes = old_removed_bytes;
6824 if (action->do_action)
6825 removed_bytes += action->removed_bytes;
6830 for (i = 0; i < ebb_table->action_count; ++i)
6832 proposed_action *action = &ebb_table->actions[i];
6833 if (action->do_action)
6834 removed_bytes += action->removed_bytes;
6837 if ((removed_bytes % (1 << ebb_table->ebb.sec->alignment_power)) != 0
6838 && ebb->ends_unreachable)
6840 proposed_action *action;
6844 BFD_ASSERT (ebb_table->action_count != 0);
6845 action = &ebb_table->actions[ebb_table->action_count - 1];
6846 BFD_ASSERT (action->action == ta_fill);
6847 BFD_ASSERT (ebb->ends_unreachable->flags & XTENSA_PROP_UNREACHABLE);
6849 extra_space = compute_fill_extra_space (ebb->ends_unreachable);
6850 br = action->removed_bytes + removed_bytes + extra_space;
6851 br = br & ((1 << ebb->sec->alignment_power ) - 1);
6853 action->removed_bytes = extra_space - br;
6859 /* Use check_section_ebb_pcrels_fit to make sure that all of the
6860 relocations in a section will fit if a proposed set of actions
6864 check_section_ebb_pcrels_fit (bfd *abfd,
6867 Elf_Internal_Rela *internal_relocs,
6868 const ebb_constraint *constraint)
6871 Elf_Internal_Rela *irel;
6872 xtensa_relax_info *relax_info;
6874 relax_info = get_xtensa_relax_info (sec);
6876 for (i = 0; i < sec->reloc_count; i++)
6879 bfd_vma orig_self_offset, orig_target_offset;
6880 bfd_vma self_offset, target_offset;
6882 reloc_howto_type *howto;
6883 int self_removed_bytes, target_removed_bytes;
6885 irel = &internal_relocs[i];
6886 r_type = ELF32_R_TYPE (irel->r_info);
6888 howto = &elf_howto_table[r_type];
6889 /* We maintain the required invariant: PC-relative relocations
6890 that fit before linking must fit after linking. Thus we only
6891 need to deal with relocations to the same section that are
6893 if (ELF32_R_TYPE (irel->r_info) == R_XTENSA_ASM_SIMPLIFY
6894 || !howto->pc_relative)
6897 r_reloc_init (&r_rel, abfd, irel, contents,
6898 bfd_get_section_limit (abfd, sec));
6900 if (r_reloc_get_section (&r_rel) != sec)
6903 orig_self_offset = irel->r_offset;
6904 orig_target_offset = r_rel.target_offset;
6906 self_offset = orig_self_offset;
6907 target_offset = orig_target_offset;
6911 self_offset = offset_with_removed_text (&relax_info->action_list,
6913 target_offset = offset_with_removed_text (&relax_info->action_list,
6914 orig_target_offset);
6917 self_removed_bytes = 0;
6918 target_removed_bytes = 0;
6920 for (j = 0; j < constraint->action_count; ++j)
6922 proposed_action *action = &constraint->actions[j];
6923 bfd_vma offset = action->offset;
6924 int removed_bytes = action->removed_bytes;
6925 if (offset < orig_self_offset
6926 || (offset == orig_self_offset && action->action == ta_fill
6927 && action->removed_bytes < 0))
6928 self_removed_bytes += removed_bytes;
6929 if (offset < orig_target_offset
6930 || (offset == orig_target_offset && action->action == ta_fill
6931 && action->removed_bytes < 0))
6932 target_removed_bytes += removed_bytes;
6934 self_offset -= self_removed_bytes;
6935 target_offset -= target_removed_bytes;
6937 /* Try to encode it. Get the operand and check. */
6938 if (is_alt_relocation (ELF32_R_TYPE (irel->r_info)))
6940 /* None of the current alternate relocs are PC-relative,
6941 and only PC-relative relocs matter here. */
6945 xtensa_opcode opcode;
6948 opcode = get_relocation_opcode (abfd, sec, contents, irel);
6949 if (opcode == XTENSA_UNDEFINED)
6952 opnum = get_relocation_opnd (opcode, ELF32_R_TYPE (irel->r_info));
6953 if (opnum == XTENSA_UNDEFINED)
6956 if (!pcrel_reloc_fits (opcode, opnum, self_offset, target_offset))
6966 check_section_ebb_reduces (const ebb_constraint *constraint)
6971 for (i = 0; i < constraint->action_count; i++)
6973 const proposed_action *action = &constraint->actions[i];
6974 if (action->do_action)
6975 removed += action->removed_bytes;
6985 text_action_add_proposed (text_action_list *l,
6986 const ebb_constraint *ebb_table,
6991 for (i = 0; i < ebb_table->action_count; i++)
6993 proposed_action *action = &ebb_table->actions[i];
6995 if (!action->do_action)
6997 switch (action->action)
6999 case ta_remove_insn:
7000 case ta_remove_longcall:
7001 case ta_convert_longcall:
7002 case ta_narrow_insn:
7005 case ta_remove_literal:
7006 text_action_add (l, action->action, sec, action->offset,
7007 action->removed_bytes);
7020 compute_fill_extra_space (property_table_entry *entry)
7022 int fill_extra_space;
7027 if ((entry->flags & XTENSA_PROP_UNREACHABLE) == 0)
7030 fill_extra_space = entry->size;
7031 if ((entry->flags & XTENSA_PROP_ALIGN) != 0)
7033 /* Fill bytes for alignment:
7034 (2**n)-1 - (addr + (2**n)-1) & (2**n -1) */
7035 int pow = GET_XTENSA_PROP_ALIGNMENT (entry->flags);
7036 int nsm = (1 << pow) - 1;
7037 bfd_vma addr = entry->address + entry->size;
7038 bfd_vma align_fill = nsm - ((addr + nsm) & nsm);
7039 fill_extra_space += align_fill;
7041 return fill_extra_space;
7045 /* First relaxation pass. */
7047 /* If the section contains relaxable literals, check each literal to
7048 see if it has the same value as another literal that has already
7049 been seen, either in the current section or a previous one. If so,
7050 add an entry to the per-section list of removed literals. The
7051 actual changes are deferred until the next pass. */
7054 compute_removed_literals (bfd *abfd,
7056 struct bfd_link_info *link_info,
7057 value_map_hash_table *values)
7059 xtensa_relax_info *relax_info;
7061 Elf_Internal_Rela *internal_relocs;
7062 source_reloc *src_relocs, *rel;
7063 bfd_boolean ok = TRUE;
7064 property_table_entry *prop_table = NULL;
7067 bfd_boolean last_loc_is_prev = FALSE;
7068 bfd_vma last_target_offset = 0;
7069 section_cache_t target_sec_cache;
7070 bfd_size_type sec_size;
7072 init_section_cache (&target_sec_cache);
7074 /* Do nothing if it is not a relaxable literal section. */
7075 relax_info = get_xtensa_relax_info (sec);
7076 BFD_ASSERT (relax_info);
7077 if (!relax_info->is_relaxable_literal_section)
7080 internal_relocs = retrieve_internal_relocs (abfd, sec,
7081 link_info->keep_memory);
7083 sec_size = bfd_get_section_limit (abfd, sec);
7084 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
7085 if (contents == NULL && sec_size != 0)
7091 /* Sort the source_relocs by target offset. */
7092 src_relocs = relax_info->src_relocs;
7093 qsort (src_relocs, relax_info->src_count,
7094 sizeof (source_reloc), source_reloc_compare);
7095 qsort (internal_relocs, sec->reloc_count, sizeof (Elf_Internal_Rela),
7096 internal_reloc_compare);
7098 ptblsize = xtensa_read_table_entries (abfd, sec, &prop_table,
7099 XTENSA_PROP_SEC_NAME, FALSE);
7107 for (i = 0; i < relax_info->src_count; i++)
7109 Elf_Internal_Rela *irel = NULL;
7111 rel = &src_relocs[i];
7112 if (get_l32r_opcode () != rel->opcode)
7114 irel = get_irel_at_offset (sec, internal_relocs,
7115 rel->r_rel.target_offset);
7117 /* If the relocation on this is not a simple R_XTENSA_32 or
7118 R_XTENSA_PLT then do not consider it. This may happen when
7119 the difference of two symbols is used in a literal. */
7120 if (irel && (ELF32_R_TYPE (irel->r_info) != R_XTENSA_32
7121 && ELF32_R_TYPE (irel->r_info) != R_XTENSA_PLT))
7124 /* If the target_offset for this relocation is the same as the
7125 previous relocation, then we've already considered whether the
7126 literal can be coalesced. Skip to the next one.... */
7127 if (i != 0 && prev_i != -1
7128 && src_relocs[i-1].r_rel.target_offset == rel->r_rel.target_offset)
7132 if (last_loc_is_prev &&
7133 last_target_offset + 4 != rel->r_rel.target_offset)
7134 last_loc_is_prev = FALSE;
7136 /* Check if the relocation was from an L32R that is being removed
7137 because a CALLX was converted to a direct CALL, and check if
7138 there are no other relocations to the literal. */
7139 if (is_removable_literal (rel, i, src_relocs, relax_info->src_count))
7141 if (!remove_dead_literal (abfd, sec, link_info, internal_relocs,
7142 irel, rel, prop_table, ptblsize))
7147 last_target_offset = rel->r_rel.target_offset;
7151 if (!identify_literal_placement (abfd, sec, contents, link_info,
7153 &last_loc_is_prev, irel,
7154 relax_info->src_count - i, rel,
7155 prop_table, ptblsize,
7156 &target_sec_cache, rel->is_abs_literal))
7161 last_target_offset = rel->r_rel.target_offset;
7165 print_removed_literals (stderr, &relax_info->removed_list);
7166 print_action_list (stderr, &relax_info->action_list);
7170 if (prop_table) free (prop_table);
7171 clear_section_cache (&target_sec_cache);
7173 release_contents (sec, contents);
7174 release_internal_relocs (sec, internal_relocs);
7179 static Elf_Internal_Rela *
7180 get_irel_at_offset (asection *sec,
7181 Elf_Internal_Rela *internal_relocs,
7185 Elf_Internal_Rela *irel;
7187 Elf_Internal_Rela key;
7189 if (!internal_relocs)
7192 key.r_offset = offset;
7193 irel = bsearch (&key, internal_relocs, sec->reloc_count,
7194 sizeof (Elf_Internal_Rela), internal_reloc_matches);
7198 /* bsearch does not guarantee which will be returned if there are
7199 multiple matches. We need the first that is not an alignment. */
7200 i = irel - internal_relocs;
7203 if (internal_relocs[i-1].r_offset != offset)
7207 for ( ; i < sec->reloc_count; i++)
7209 irel = &internal_relocs[i];
7210 r_type = ELF32_R_TYPE (irel->r_info);
7211 if (irel->r_offset == offset && r_type != R_XTENSA_NONE)
7220 is_removable_literal (const source_reloc *rel,
7222 const source_reloc *src_relocs,
7225 const source_reloc *curr_rel;
7229 for (++i; i < src_count; ++i)
7231 curr_rel = &src_relocs[i];
7232 /* If all others have the same target offset.... */
7233 if (curr_rel->r_rel.target_offset != rel->r_rel.target_offset)
7236 if (!curr_rel->is_null
7237 && !xtensa_is_property_section (curr_rel->source_sec)
7238 && !(curr_rel->source_sec->flags & SEC_DEBUGGING))
7246 remove_dead_literal (bfd *abfd,
7248 struct bfd_link_info *link_info,
7249 Elf_Internal_Rela *internal_relocs,
7250 Elf_Internal_Rela *irel,
7252 property_table_entry *prop_table,
7255 property_table_entry *entry;
7256 xtensa_relax_info *relax_info;
7258 relax_info = get_xtensa_relax_info (sec);
7262 entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
7263 sec->vma + rel->r_rel.target_offset);
7265 /* Mark the unused literal so that it will be removed. */
7266 add_removed_literal (&relax_info->removed_list, &rel->r_rel, NULL);
7268 text_action_add (&relax_info->action_list,
7269 ta_remove_literal, sec, rel->r_rel.target_offset, 4);
7271 /* If the section is 4-byte aligned, do not add fill. */
7272 if (sec->alignment_power > 2)
7274 int fill_extra_space;
7275 bfd_vma entry_sec_offset;
7277 property_table_entry *the_add_entry;
7281 entry_sec_offset = entry->address - sec->vma + entry->size;
7283 entry_sec_offset = rel->r_rel.target_offset + 4;
7285 /* If the literal range is at the end of the section,
7287 the_add_entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
7289 fill_extra_space = compute_fill_extra_space (the_add_entry);
7291 fa = find_fill_action (&relax_info->action_list, sec, entry_sec_offset);
7292 removed_diff = compute_removed_action_diff (fa, sec, entry_sec_offset,
7293 -4, fill_extra_space);
7295 adjust_fill_action (fa, removed_diff);
7297 text_action_add (&relax_info->action_list,
7298 ta_fill, sec, entry_sec_offset, removed_diff);
7301 /* Zero out the relocation on this literal location. */
7304 if (elf_hash_table (link_info)->dynamic_sections_created)
7305 shrink_dynamic_reloc_sections (link_info, abfd, sec, irel);
7307 irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
7308 pin_internal_relocs (sec, internal_relocs);
7311 /* Do not modify "last_loc_is_prev". */
7317 identify_literal_placement (bfd *abfd,
7320 struct bfd_link_info *link_info,
7321 value_map_hash_table *values,
7322 bfd_boolean *last_loc_is_prev_p,
7323 Elf_Internal_Rela *irel,
7324 int remaining_src_rels,
7326 property_table_entry *prop_table,
7328 section_cache_t *target_sec_cache,
7329 bfd_boolean is_abs_literal)
7333 xtensa_relax_info *relax_info;
7334 bfd_boolean literal_placed = FALSE;
7336 unsigned long value;
7337 bfd_boolean final_static_link;
7338 bfd_size_type sec_size;
7340 relax_info = get_xtensa_relax_info (sec);
7344 sec_size = bfd_get_section_limit (abfd, sec);
7347 (!link_info->relocatable
7348 && !elf_hash_table (link_info)->dynamic_sections_created);
7350 /* The placement algorithm first checks to see if the literal is
7351 already in the value map. If so and the value map is reachable
7352 from all uses, then the literal is moved to that location. If
7353 not, then we identify the last location where a fresh literal was
7354 placed. If the literal can be safely moved there, then we do so.
7355 If not, then we assume that the literal is not to move and leave
7356 the literal where it is, marking it as the last literal
7359 /* Find the literal value. */
7361 r_reloc_init (&r_rel, abfd, irel, contents, sec_size);
7364 BFD_ASSERT (rel->r_rel.target_offset < sec_size);
7365 value = bfd_get_32 (abfd, contents + rel->r_rel.target_offset);
7367 init_literal_value (&val, &r_rel, value, is_abs_literal);
7369 /* Check if we've seen another literal with the same value that
7370 is in the same output section. */
7371 val_map = value_map_get_cached_value (values, &val, final_static_link);
7374 && (r_reloc_get_section (&val_map->loc)->output_section
7375 == sec->output_section)
7376 && relocations_reach (rel, remaining_src_rels, &val_map->loc)
7377 && coalesce_shared_literal (sec, rel, prop_table, ptblsize, val_map))
7379 /* No change to last_loc_is_prev. */
7380 literal_placed = TRUE;
7383 /* For relocatable links, do not try to move literals. To do it
7384 correctly might increase the number of relocations in an input
7385 section making the default relocatable linking fail. */
7386 if (!link_info->relocatable && !literal_placed
7387 && values->has_last_loc && !(*last_loc_is_prev_p))
7389 asection *target_sec = r_reloc_get_section (&values->last_loc);
7390 if (target_sec && target_sec->output_section == sec->output_section)
7392 /* Increment the virtual offset. */
7393 r_reloc try_loc = values->last_loc;
7394 try_loc.virtual_offset += 4;
7396 /* There is a last loc that was in the same output section. */
7397 if (relocations_reach (rel, remaining_src_rels, &try_loc)
7398 && move_shared_literal (sec, link_info, rel,
7399 prop_table, ptblsize,
7400 &try_loc, &val, target_sec_cache))
7402 values->last_loc.virtual_offset += 4;
7403 literal_placed = TRUE;
7405 val_map = add_value_map (values, &val, &try_loc,
7408 val_map->loc = try_loc;
7413 if (!literal_placed)
7415 /* Nothing worked, leave the literal alone but update the last loc. */
7416 values->has_last_loc = TRUE;
7417 values->last_loc = rel->r_rel;
7419 val_map = add_value_map (values, &val, &rel->r_rel, final_static_link);
7421 val_map->loc = rel->r_rel;
7422 *last_loc_is_prev_p = TRUE;
7429 /* Check if the original relocations (presumably on L32R instructions)
7430 identified by reloc[0..N] can be changed to reference the literal
7431 identified by r_rel. If r_rel is out of range for any of the
7432 original relocations, then we don't want to coalesce the original
7433 literal with the one at r_rel. We only check reloc[0..N], where the
7434 offsets are all the same as for reloc[0] (i.e., they're all
7435 referencing the same literal) and where N is also bounded by the
7436 number of remaining entries in the "reloc" array. The "reloc" array
7437 is sorted by target offset so we know all the entries for the same
7438 literal will be contiguous. */
7441 relocations_reach (source_reloc *reloc,
7442 int remaining_relocs,
7443 const r_reloc *r_rel)
7445 bfd_vma from_offset, source_address, dest_address;
7449 if (!r_reloc_is_defined (r_rel))
7452 sec = r_reloc_get_section (r_rel);
7453 from_offset = reloc[0].r_rel.target_offset;
7455 for (i = 0; i < remaining_relocs; i++)
7457 if (reloc[i].r_rel.target_offset != from_offset)
7460 /* Ignore relocations that have been removed. */
7461 if (reloc[i].is_null)
7464 /* The original and new output section for these must be the same
7465 in order to coalesce. */
7466 if (r_reloc_get_section (&reloc[i].r_rel)->output_section
7467 != sec->output_section)
7470 /* A literal with no PC-relative relocations can be moved anywhere. */
7471 if (reloc[i].opnd != -1)
7473 /* Otherwise, check to see that it fits. */
7474 source_address = (reloc[i].source_sec->output_section->vma
7475 + reloc[i].source_sec->output_offset
7476 + reloc[i].r_rel.rela.r_offset);
7477 dest_address = (sec->output_section->vma
7478 + sec->output_offset
7479 + r_rel->target_offset);
7481 if (!pcrel_reloc_fits (reloc[i].opcode, reloc[i].opnd,
7482 source_address, dest_address))
7491 /* Move a literal to another literal location because it is
7492 the same as the other literal value. */
7495 coalesce_shared_literal (asection *sec,
7497 property_table_entry *prop_table,
7501 property_table_entry *entry;
7503 property_table_entry *the_add_entry;
7505 xtensa_relax_info *relax_info;
7507 relax_info = get_xtensa_relax_info (sec);
7511 entry = elf_xtensa_find_property_entry
7512 (prop_table, ptblsize, sec->vma + rel->r_rel.target_offset);
7513 if (entry && (entry->flags & XTENSA_PROP_INSN_NO_TRANSFORM))
7516 /* Mark that the literal will be coalesced. */
7517 add_removed_literal (&relax_info->removed_list, &rel->r_rel, &val_map->loc);
7519 text_action_add (&relax_info->action_list,
7520 ta_remove_literal, sec, rel->r_rel.target_offset, 4);
7522 /* If the section is 4-byte aligned, do not add fill. */
7523 if (sec->alignment_power > 2)
7525 int fill_extra_space;
7526 bfd_vma entry_sec_offset;
7529 entry_sec_offset = entry->address - sec->vma + entry->size;
7531 entry_sec_offset = rel->r_rel.target_offset + 4;
7533 /* If the literal range is at the end of the section,
7535 fill_extra_space = 0;
7536 the_add_entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
7538 if (the_add_entry && (the_add_entry->flags & XTENSA_PROP_UNREACHABLE))
7539 fill_extra_space = the_add_entry->size;
7541 fa = find_fill_action (&relax_info->action_list, sec, entry_sec_offset);
7542 removed_diff = compute_removed_action_diff (fa, sec, entry_sec_offset,
7543 -4, fill_extra_space);
7545 adjust_fill_action (fa, removed_diff);
7547 text_action_add (&relax_info->action_list,
7548 ta_fill, sec, entry_sec_offset, removed_diff);
7555 /* Move a literal to another location. This may actually increase the
7556 total amount of space used because of alignments so we need to do
7557 this carefully. Also, it may make a branch go out of range. */
7560 move_shared_literal (asection *sec,
7561 struct bfd_link_info *link_info,
7563 property_table_entry *prop_table,
7565 const r_reloc *target_loc,
7566 const literal_value *lit_value,
7567 section_cache_t *target_sec_cache)
7569 property_table_entry *the_add_entry, *src_entry, *target_entry = NULL;
7570 text_action *fa, *target_fa;
7572 xtensa_relax_info *relax_info, *target_relax_info;
7573 asection *target_sec;
7575 ebb_constraint ebb_table;
7576 bfd_boolean relocs_fit;
7578 /* If this routine always returns FALSE, the literals that cannot be
7579 coalesced will not be moved. */
7580 if (elf32xtensa_no_literal_movement)
7583 relax_info = get_xtensa_relax_info (sec);
7587 target_sec = r_reloc_get_section (target_loc);
7588 target_relax_info = get_xtensa_relax_info (target_sec);
7590 /* Literals to undefined sections may not be moved because they
7591 must report an error. */
7592 if (bfd_is_und_section (target_sec))
7595 src_entry = elf_xtensa_find_property_entry
7596 (prop_table, ptblsize, sec->vma + rel->r_rel.target_offset);
7598 if (!section_cache_section (target_sec_cache, target_sec, link_info))
7601 target_entry = elf_xtensa_find_property_entry
7602 (target_sec_cache->ptbl, target_sec_cache->pte_count,
7603 target_sec->vma + target_loc->target_offset);
7608 /* Make sure that we have not broken any branches. */
7611 init_ebb_constraint (&ebb_table);
7612 ebb = &ebb_table.ebb;
7613 init_ebb (ebb, target_sec_cache->sec, target_sec_cache->contents,
7614 target_sec_cache->content_length,
7615 target_sec_cache->ptbl, target_sec_cache->pte_count,
7616 target_sec_cache->relocs, target_sec_cache->reloc_count);
7618 /* Propose to add 4 bytes + worst-case alignment size increase to
7620 ebb_propose_action (&ebb_table, EBB_NO_ALIGN, 0,
7621 ta_fill, target_loc->target_offset,
7622 -4 - (1 << target_sec->alignment_power), TRUE);
7624 /* Check all of the PC-relative relocations to make sure they still fit. */
7625 relocs_fit = check_section_ebb_pcrels_fit (target_sec->owner, target_sec,
7626 target_sec_cache->contents,
7627 target_sec_cache->relocs,
7633 text_action_add_literal (&target_relax_info->action_list,
7634 ta_add_literal, target_loc, lit_value, -4);
7636 if (target_sec->alignment_power > 2 && target_entry != src_entry)
7638 /* May need to add or remove some fill to maintain alignment. */
7639 int fill_extra_space;
7640 bfd_vma entry_sec_offset;
7643 target_entry->address - target_sec->vma + target_entry->size;
7645 /* If the literal range is at the end of the section,
7647 fill_extra_space = 0;
7649 elf_xtensa_find_property_entry (target_sec_cache->ptbl,
7650 target_sec_cache->pte_count,
7652 if (the_add_entry && (the_add_entry->flags & XTENSA_PROP_UNREACHABLE))
7653 fill_extra_space = the_add_entry->size;
7655 target_fa = find_fill_action (&target_relax_info->action_list,
7656 target_sec, entry_sec_offset);
7657 removed_diff = compute_removed_action_diff (target_fa, target_sec,
7658 entry_sec_offset, 4,
7661 adjust_fill_action (target_fa, removed_diff);
7663 text_action_add (&target_relax_info->action_list,
7664 ta_fill, target_sec, entry_sec_offset, removed_diff);
7667 /* Mark that the literal will be moved to the new location. */
7668 add_removed_literal (&relax_info->removed_list, &rel->r_rel, target_loc);
7670 /* Remove the literal. */
7671 text_action_add (&relax_info->action_list,
7672 ta_remove_literal, sec, rel->r_rel.target_offset, 4);
7674 /* If the section is 4-byte aligned, do not add fill. */
7675 if (sec->alignment_power > 2 && target_entry != src_entry)
7677 int fill_extra_space;
7678 bfd_vma entry_sec_offset;
7681 entry_sec_offset = src_entry->address - sec->vma + src_entry->size;
7683 entry_sec_offset = rel->r_rel.target_offset+4;
7685 /* If the literal range is at the end of the section,
7687 fill_extra_space = 0;
7688 the_add_entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
7690 if (the_add_entry && (the_add_entry->flags & XTENSA_PROP_UNREACHABLE))
7691 fill_extra_space = the_add_entry->size;
7693 fa = find_fill_action (&relax_info->action_list, sec, entry_sec_offset);
7694 removed_diff = compute_removed_action_diff (fa, sec, entry_sec_offset,
7695 -4, fill_extra_space);
7697 adjust_fill_action (fa, removed_diff);
7699 text_action_add (&relax_info->action_list,
7700 ta_fill, sec, entry_sec_offset, removed_diff);
7707 /* Second relaxation pass. */
7709 /* Modify all of the relocations to point to the right spot, and if this
7710 is a relaxable section, delete the unwanted literals and fix the
7714 relax_section (bfd *abfd, asection *sec, struct bfd_link_info *link_info)
7716 Elf_Internal_Rela *internal_relocs;
7717 xtensa_relax_info *relax_info;
7719 bfd_boolean ok = TRUE;
7721 bfd_boolean rv = FALSE;
7722 bfd_boolean virtual_action;
7723 bfd_size_type sec_size;
7725 sec_size = bfd_get_section_limit (abfd, sec);
7726 relax_info = get_xtensa_relax_info (sec);
7727 BFD_ASSERT (relax_info);
7729 /* First translate any of the fixes that have been added already. */
7730 translate_section_fixes (sec);
7732 /* Handle property sections (e.g., literal tables) specially. */
7733 if (xtensa_is_property_section (sec))
7735 BFD_ASSERT (!relax_info->is_relaxable_literal_section);
7736 return relax_property_section (abfd, sec, link_info);
7739 internal_relocs = retrieve_internal_relocs (abfd, sec,
7740 link_info->keep_memory);
7741 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
7742 if (contents == NULL && sec_size != 0)
7748 if (internal_relocs)
7750 for (i = 0; i < sec->reloc_count; i++)
7752 Elf_Internal_Rela *irel;
7753 xtensa_relax_info *target_relax_info;
7754 bfd_vma source_offset, old_source_offset;
7757 asection *target_sec;
7759 /* Locally change the source address.
7760 Translate the target to the new target address.
7761 If it points to this section and has been removed,
7765 irel = &internal_relocs[i];
7766 source_offset = irel->r_offset;
7767 old_source_offset = source_offset;
7769 r_type = ELF32_R_TYPE (irel->r_info);
7770 r_reloc_init (&r_rel, abfd, irel, contents,
7771 bfd_get_section_limit (abfd, sec));
7773 /* If this section could have changed then we may need to
7774 change the relocation's offset. */
7776 if (relax_info->is_relaxable_literal_section
7777 || relax_info->is_relaxable_asm_section)
7779 if (r_type != R_XTENSA_NONE
7780 && find_removed_literal (&relax_info->removed_list,
7783 /* Remove this relocation. */
7784 if (elf_hash_table (link_info)->dynamic_sections_created)
7785 shrink_dynamic_reloc_sections (link_info, abfd, sec, irel);
7786 irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
7787 irel->r_offset = offset_with_removed_text
7788 (&relax_info->action_list, irel->r_offset);
7789 pin_internal_relocs (sec, internal_relocs);
7793 if (r_type == R_XTENSA_ASM_SIMPLIFY)
7795 text_action *action =
7796 find_insn_action (&relax_info->action_list,
7798 if (action && (action->action == ta_convert_longcall
7799 || action->action == ta_remove_longcall))
7801 bfd_reloc_status_type retval;
7802 char *error_message = NULL;
7804 retval = contract_asm_expansion (contents, sec_size,
7805 irel, &error_message);
7806 if (retval != bfd_reloc_ok)
7808 (*link_info->callbacks->reloc_dangerous)
7809 (link_info, error_message, abfd, sec,
7813 /* Update the action so that the code that moves
7814 the contents will do the right thing. */
7815 if (action->action == ta_remove_longcall)
7816 action->action = ta_remove_insn;
7818 action->action = ta_none;
7819 /* Refresh the info in the r_rel. */
7820 r_reloc_init (&r_rel, abfd, irel, contents, sec_size);
7821 r_type = ELF32_R_TYPE (irel->r_info);
7825 source_offset = offset_with_removed_text
7826 (&relax_info->action_list, irel->r_offset);
7827 irel->r_offset = source_offset;
7830 /* If the target section could have changed then
7831 we may need to change the relocation's target offset. */
7833 target_sec = r_reloc_get_section (&r_rel);
7834 target_relax_info = get_xtensa_relax_info (target_sec);
7836 if (target_relax_info
7837 && (target_relax_info->is_relaxable_literal_section
7838 || target_relax_info->is_relaxable_asm_section))
7842 bfd_vma addend_displacement;
7844 translate_reloc (&r_rel, &new_reloc);
7846 if (r_type == R_XTENSA_DIFF8
7847 || r_type == R_XTENSA_DIFF16
7848 || r_type == R_XTENSA_DIFF32)
7850 bfd_vma diff_value = 0, new_end_offset, diff_mask = 0;
7852 if (bfd_get_section_limit (abfd, sec) < old_source_offset)
7854 (*link_info->callbacks->reloc_dangerous)
7855 (link_info, _("invalid relocation address"),
7856 abfd, sec, old_source_offset);
7862 case R_XTENSA_DIFF8:
7864 bfd_get_8 (abfd, &contents[old_source_offset]);
7866 case R_XTENSA_DIFF16:
7868 bfd_get_16 (abfd, &contents[old_source_offset]);
7870 case R_XTENSA_DIFF32:
7872 bfd_get_32 (abfd, &contents[old_source_offset]);
7876 new_end_offset = offset_with_removed_text
7877 (&target_relax_info->action_list,
7878 r_rel.target_offset + diff_value);
7879 diff_value = new_end_offset - new_reloc.target_offset;
7883 case R_XTENSA_DIFF8:
7885 bfd_put_8 (abfd, diff_value,
7886 &contents[old_source_offset]);
7888 case R_XTENSA_DIFF16:
7890 bfd_put_16 (abfd, diff_value,
7891 &contents[old_source_offset]);
7893 case R_XTENSA_DIFF32:
7894 diff_mask = 0xffffffff;
7895 bfd_put_32 (abfd, diff_value,
7896 &contents[old_source_offset]);
7900 /* Check for overflow. */
7901 if ((diff_value & ~diff_mask) != 0)
7903 (*link_info->callbacks->reloc_dangerous)
7904 (link_info, _("overflow after relaxation"),
7905 abfd, sec, old_source_offset);
7909 pin_contents (sec, contents);
7912 /* FIXME: If the relocation still references a section in
7913 the same input file, the relocation should be modified
7914 directly instead of adding a "fix" record. */
7916 addend_displacement =
7917 new_reloc.target_offset + new_reloc.virtual_offset;
7919 fix = reloc_bfd_fix_init (sec, source_offset, r_type, 0,
7920 r_reloc_get_section (&new_reloc),
7921 addend_displacement, TRUE);
7925 pin_internal_relocs (sec, internal_relocs);
7929 if ((relax_info->is_relaxable_literal_section
7930 || relax_info->is_relaxable_asm_section)
7931 && relax_info->action_list.head)
7933 /* Walk through the planned actions and build up a table
7934 of move, copy and fill records. Use the move, copy and
7935 fill records to perform the actions once. */
7937 bfd_size_type size = sec->size;
7939 bfd_size_type final_size, copy_size, orig_insn_size;
7940 bfd_byte *scratch = NULL;
7941 bfd_byte *dup_contents = NULL;
7942 bfd_size_type orig_size = size;
7943 bfd_vma orig_dot = 0;
7944 bfd_vma orig_dot_copied = 0; /* Byte copied already from
7945 orig dot in physical memory. */
7946 bfd_vma orig_dot_vo = 0; /* Virtual offset from orig_dot. */
7947 bfd_vma dup_dot = 0;
7949 text_action *action = relax_info->action_list.head;
7951 final_size = sec->size;
7952 for (action = relax_info->action_list.head; action;
7953 action = action->next)
7955 final_size -= action->removed_bytes;
7958 scratch = (bfd_byte *) bfd_zmalloc (final_size);
7959 dup_contents = (bfd_byte *) bfd_zmalloc (final_size);
7961 /* The dot is the current fill location. */
7963 print_action_list (stderr, &relax_info->action_list);
7966 for (action = relax_info->action_list.head; action;
7967 action = action->next)
7969 virtual_action = FALSE;
7970 if (action->offset > orig_dot)
7972 orig_dot += orig_dot_copied;
7973 orig_dot_copied = 0;
7975 /* Out of the virtual world. */
7978 if (action->offset > orig_dot)
7980 copy_size = action->offset - orig_dot;
7981 memmove (&dup_contents[dup_dot], &contents[orig_dot], copy_size);
7982 orig_dot += copy_size;
7983 dup_dot += copy_size;
7984 BFD_ASSERT (action->offset == orig_dot);
7986 else if (action->offset < orig_dot)
7988 if (action->action == ta_fill
7989 && action->offset - action->removed_bytes == orig_dot)
7991 /* This is OK because the fill only effects the dup_dot. */
7993 else if (action->action == ta_add_literal)
7995 /* TBD. Might need to handle this. */
7998 if (action->offset == orig_dot)
8000 if (action->virtual_offset > orig_dot_vo)
8002 if (orig_dot_vo == 0)
8004 /* Need to copy virtual_offset bytes. Probably four. */
8005 copy_size = action->virtual_offset - orig_dot_vo;
8006 memmove (&dup_contents[dup_dot],
8007 &contents[orig_dot], copy_size);
8008 orig_dot_copied = copy_size;
8009 dup_dot += copy_size;
8011 virtual_action = TRUE;
8014 BFD_ASSERT (action->virtual_offset <= orig_dot_vo);
8016 switch (action->action)
8018 case ta_remove_literal:
8019 case ta_remove_insn:
8020 BFD_ASSERT (action->removed_bytes >= 0);
8021 orig_dot += action->removed_bytes;
8024 case ta_narrow_insn:
8027 memmove (scratch, &contents[orig_dot], orig_insn_size);
8028 BFD_ASSERT (action->removed_bytes == 1);
8029 rv = narrow_instruction (scratch, final_size, 0, TRUE);
8031 memmove (&dup_contents[dup_dot], scratch, copy_size);
8032 orig_dot += orig_insn_size;
8033 dup_dot += copy_size;
8037 if (action->removed_bytes >= 0)
8038 orig_dot += action->removed_bytes;
8041 /* Already zeroed in dup_contents. Just bump the
8043 dup_dot += (-action->removed_bytes);
8048 BFD_ASSERT (action->removed_bytes == 0);
8051 case ta_convert_longcall:
8052 case ta_remove_longcall:
8053 /* These will be removed or converted before we get here. */
8060 memmove (scratch, &contents[orig_dot], orig_insn_size);
8061 BFD_ASSERT (action->removed_bytes == -1);
8062 rv = widen_instruction (scratch, final_size, 0, TRUE);
8064 memmove (&dup_contents[dup_dot], scratch, copy_size);
8065 orig_dot += orig_insn_size;
8066 dup_dot += copy_size;
8069 case ta_add_literal:
8072 BFD_ASSERT (action->removed_bytes == -4);
8073 /* TBD -- place the literal value here and insert
8075 memset (&dup_contents[dup_dot], 0, 4);
8076 pin_internal_relocs (sec, internal_relocs);
8077 pin_contents (sec, contents);
8079 if (!move_literal (abfd, link_info, sec, dup_dot, dup_contents,
8080 relax_info, &internal_relocs, &action->value))
8084 orig_dot_vo += copy_size;
8086 orig_dot += orig_insn_size;
8087 dup_dot += copy_size;
8091 /* Not implemented yet. */
8096 size -= action->removed_bytes;
8097 removed += action->removed_bytes;
8098 BFD_ASSERT (dup_dot <= final_size);
8099 BFD_ASSERT (orig_dot <= orig_size);
8102 orig_dot += orig_dot_copied;
8103 orig_dot_copied = 0;
8105 if (orig_dot != orig_size)
8107 copy_size = orig_size - orig_dot;
8108 BFD_ASSERT (orig_size > orig_dot);
8109 BFD_ASSERT (dup_dot + copy_size == final_size);
8110 memmove (&dup_contents[dup_dot], &contents[orig_dot], copy_size);
8111 orig_dot += copy_size;
8112 dup_dot += copy_size;
8114 BFD_ASSERT (orig_size == orig_dot);
8115 BFD_ASSERT (final_size == dup_dot);
8117 /* Move the dup_contents back. */
8118 if (final_size > orig_size)
8120 /* Contents need to be reallocated. Swap the dup_contents into
8122 sec->contents = dup_contents;
8124 contents = dup_contents;
8125 pin_contents (sec, contents);
8129 BFD_ASSERT (final_size <= orig_size);
8130 memset (contents, 0, orig_size);
8131 memcpy (contents, dup_contents, final_size);
8132 free (dup_contents);
8135 pin_contents (sec, contents);
8137 sec->size = final_size;
8141 release_internal_relocs (sec, internal_relocs);
8142 release_contents (sec, contents);
8148 translate_section_fixes (asection *sec)
8150 xtensa_relax_info *relax_info;
8153 relax_info = get_xtensa_relax_info (sec);
8157 for (r = relax_info->fix_list; r != NULL; r = r->next)
8158 if (!translate_reloc_bfd_fix (r))
8165 /* Translate a fix given the mapping in the relax info for the target
8166 section. If it has already been translated, no work is required. */
8169 translate_reloc_bfd_fix (reloc_bfd_fix *fix)
8171 reloc_bfd_fix new_fix;
8173 xtensa_relax_info *relax_info;
8174 removed_literal *removed;
8175 bfd_vma new_offset, target_offset;
8177 if (fix->translated)
8180 sec = fix->target_sec;
8181 target_offset = fix->target_offset;
8183 relax_info = get_xtensa_relax_info (sec);
8186 fix->translated = TRUE;
8192 /* The fix does not need to be translated if the section cannot change. */
8193 if (!relax_info->is_relaxable_literal_section
8194 && !relax_info->is_relaxable_asm_section)
8196 fix->translated = TRUE;
8200 /* If the literal has been moved and this relocation was on an
8201 opcode, then the relocation should move to the new literal
8202 location. Otherwise, the relocation should move within the
8206 if (is_operand_relocation (fix->src_type))
8208 /* Check if the original relocation is against a literal being
8210 removed = find_removed_literal (&relax_info->removed_list,
8218 /* The fact that there is still a relocation to this literal indicates
8219 that the literal is being coalesced, not simply removed. */
8220 BFD_ASSERT (removed->to.abfd != NULL);
8222 /* This was moved to some other address (possibly another section). */
8223 new_sec = r_reloc_get_section (&removed->to);
8227 relax_info = get_xtensa_relax_info (sec);
8229 (!relax_info->is_relaxable_literal_section
8230 && !relax_info->is_relaxable_asm_section))
8232 target_offset = removed->to.target_offset;
8233 new_fix.target_sec = new_sec;
8234 new_fix.target_offset = target_offset;
8235 new_fix.translated = TRUE;
8240 target_offset = removed->to.target_offset;
8241 new_fix.target_sec = new_sec;
8244 /* The target address may have been moved within its section. */
8245 new_offset = offset_with_removed_text (&relax_info->action_list,
8248 new_fix.target_offset = new_offset;
8249 new_fix.target_offset = new_offset;
8250 new_fix.translated = TRUE;
8256 /* Fix up a relocation to take account of removed literals. */
8259 translate_reloc (const r_reloc *orig_rel, r_reloc *new_rel)
8262 xtensa_relax_info *relax_info;
8263 removed_literal *removed;
8264 bfd_vma new_offset, target_offset, removed_bytes;
8266 *new_rel = *orig_rel;
8268 if (!r_reloc_is_defined (orig_rel))
8270 sec = r_reloc_get_section (orig_rel);
8272 relax_info = get_xtensa_relax_info (sec);
8273 BFD_ASSERT (relax_info);
8275 if (!relax_info->is_relaxable_literal_section
8276 && !relax_info->is_relaxable_asm_section)
8279 target_offset = orig_rel->target_offset;
8282 if (is_operand_relocation (ELF32_R_TYPE (orig_rel->rela.r_info)))
8284 /* Check if the original relocation is against a literal being
8286 removed = find_removed_literal (&relax_info->removed_list,
8289 if (removed && removed->to.abfd)
8293 /* The fact that there is still a relocation to this literal indicates
8294 that the literal is being coalesced, not simply removed. */
8295 BFD_ASSERT (removed->to.abfd != NULL);
8297 /* This was moved to some other address
8298 (possibly in another section). */
8299 *new_rel = removed->to;
8300 new_sec = r_reloc_get_section (new_rel);
8304 relax_info = get_xtensa_relax_info (sec);
8306 || (!relax_info->is_relaxable_literal_section
8307 && !relax_info->is_relaxable_asm_section))
8310 target_offset = new_rel->target_offset;
8313 /* ...and the target address may have been moved within its section. */
8314 new_offset = offset_with_removed_text (&relax_info->action_list,
8317 /* Modify the offset and addend. */
8318 removed_bytes = target_offset - new_offset;
8319 new_rel->target_offset = new_offset;
8320 new_rel->rela.r_addend -= removed_bytes;
8324 /* For dynamic links, there may be a dynamic relocation for each
8325 literal. The number of dynamic relocations must be computed in
8326 size_dynamic_sections, which occurs before relaxation. When a
8327 literal is removed, this function checks if there is a corresponding
8328 dynamic relocation and shrinks the size of the appropriate dynamic
8329 relocation section accordingly. At this point, the contents of the
8330 dynamic relocation sections have not yet been filled in, so there's
8331 nothing else that needs to be done. */
8334 shrink_dynamic_reloc_sections (struct bfd_link_info *info,
8336 asection *input_section,
8337 Elf_Internal_Rela *rel)
8339 Elf_Internal_Shdr *symtab_hdr;
8340 struct elf_link_hash_entry **sym_hashes;
8341 unsigned long r_symndx;
8343 struct elf_link_hash_entry *h;
8344 bfd_boolean dynamic_symbol;
8346 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
8347 sym_hashes = elf_sym_hashes (abfd);
8349 r_type = ELF32_R_TYPE (rel->r_info);
8350 r_symndx = ELF32_R_SYM (rel->r_info);
8352 if (r_symndx < symtab_hdr->sh_info)
8355 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
8357 dynamic_symbol = xtensa_elf_dynamic_symbol_p (h, info);
8359 if ((r_type == R_XTENSA_32 || r_type == R_XTENSA_PLT)
8360 && (input_section->flags & SEC_ALLOC) != 0
8361 && (dynamic_symbol || info->shared))
8364 const char *srel_name;
8366 bfd_boolean is_plt = FALSE;
8368 dynobj = elf_hash_table (info)->dynobj;
8369 BFD_ASSERT (dynobj != NULL);
8371 if (dynamic_symbol && r_type == R_XTENSA_PLT)
8373 srel_name = ".rela.plt";
8377 srel_name = ".rela.got";
8379 /* Reduce size of the .rela.* section by one reloc. */
8380 srel = bfd_get_section_by_name (dynobj, srel_name);
8381 BFD_ASSERT (srel != NULL);
8382 BFD_ASSERT (srel->size >= sizeof (Elf32_External_Rela));
8383 srel->size -= sizeof (Elf32_External_Rela);
8387 asection *splt, *sgotplt, *srelgot;
8388 int reloc_index, chunk;
8390 /* Find the PLT reloc index of the entry being removed. This
8391 is computed from the size of ".rela.plt". It is needed to
8392 figure out which PLT chunk to resize. Usually "last index
8393 = size - 1" since the index starts at zero, but in this
8394 context, the size has just been decremented so there's no
8395 need to subtract one. */
8396 reloc_index = srel->size / sizeof (Elf32_External_Rela);
8398 chunk = reloc_index / PLT_ENTRIES_PER_CHUNK;
8399 splt = elf_xtensa_get_plt_section (dynobj, chunk);
8400 sgotplt = elf_xtensa_get_gotplt_section (dynobj, chunk);
8401 BFD_ASSERT (splt != NULL && sgotplt != NULL);
8403 /* Check if an entire PLT chunk has just been eliminated. */
8404 if (reloc_index % PLT_ENTRIES_PER_CHUNK == 0)
8406 /* The two magic GOT entries for that chunk can go away. */
8407 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
8408 BFD_ASSERT (srelgot != NULL);
8409 srelgot->reloc_count -= 2;
8410 srelgot->size -= 2 * sizeof (Elf32_External_Rela);
8413 /* There should be only one entry left (and it will be
8415 BFD_ASSERT (sgotplt->size == 4);
8416 BFD_ASSERT (splt->size == PLT_ENTRY_SIZE);
8419 BFD_ASSERT (sgotplt->size >= 4);
8420 BFD_ASSERT (splt->size >= PLT_ENTRY_SIZE);
8423 splt->size -= PLT_ENTRY_SIZE;
8429 /* Take an r_rel and move it to another section. This usually
8430 requires extending the interal_relocation array and pinning it. If
8431 the original r_rel is from the same BFD, we can complete this here.
8432 Otherwise, we add a fix record to let the final link fix the
8433 appropriate address. Contents and internal relocations for the
8434 section must be pinned after calling this routine. */
8437 move_literal (bfd *abfd,
8438 struct bfd_link_info *link_info,
8442 xtensa_relax_info *relax_info,
8443 Elf_Internal_Rela **internal_relocs_p,
8444 const literal_value *lit)
8446 Elf_Internal_Rela *new_relocs = NULL;
8447 size_t new_relocs_count = 0;
8448 Elf_Internal_Rela this_rela;
8449 const r_reloc *r_rel;
8451 r_rel = &lit->r_rel;
8452 BFD_ASSERT (elf_section_data (sec)->relocs == *internal_relocs_p);
8454 if (r_reloc_is_const (r_rel))
8455 bfd_put_32 (abfd, lit->value, contents + offset);
8460 asection *target_sec;
8464 r_type = ELF32_R_TYPE (r_rel->rela.r_info);
8465 target_sec = r_reloc_get_section (r_rel);
8467 /* This is the difficult case. We have to create a fix up. */
8468 this_rela.r_offset = offset;
8469 this_rela.r_info = ELF32_R_INFO (0, r_type);
8470 this_rela.r_addend =
8471 r_rel->target_offset - r_reloc_get_target_offset (r_rel);
8472 bfd_put_32 (abfd, lit->value, contents + offset);
8474 /* Currently, we cannot move relocations during a relocatable link. */
8475 BFD_ASSERT (!link_info->relocatable);
8476 fix = reloc_bfd_fix_init (sec, offset, r_type, r_rel->abfd,
8477 r_reloc_get_section (r_rel),
8478 r_rel->target_offset + r_rel->virtual_offset,
8480 /* We also need to mark that relocations are needed here. */
8481 sec->flags |= SEC_RELOC;
8483 translate_reloc_bfd_fix (fix);
8484 /* This fix has not yet been translated. */
8487 /* Add the relocation. If we have already allocated our own
8488 space for the relocations and we have room for more, then use
8489 it. Otherwise, allocate new space and move the literals. */
8490 insert_at = sec->reloc_count;
8491 for (i = 0; i < sec->reloc_count; ++i)
8493 if (this_rela.r_offset < (*internal_relocs_p)[i].r_offset)
8500 if (*internal_relocs_p != relax_info->allocated_relocs
8501 || sec->reloc_count + 1 > relax_info->allocated_relocs_count)
8503 BFD_ASSERT (relax_info->allocated_relocs == NULL
8504 || sec->reloc_count == relax_info->relocs_count);
8506 if (relax_info->allocated_relocs_count == 0)
8507 new_relocs_count = (sec->reloc_count + 2) * 2;
8509 new_relocs_count = (relax_info->allocated_relocs_count + 2) * 2;
8511 new_relocs = (Elf_Internal_Rela *)
8512 bfd_zmalloc (sizeof (Elf_Internal_Rela) * (new_relocs_count));
8516 /* We could handle this more quickly by finding the split point. */
8518 memcpy (new_relocs, *internal_relocs_p,
8519 insert_at * sizeof (Elf_Internal_Rela));
8521 new_relocs[insert_at] = this_rela;
8523 if (insert_at != sec->reloc_count)
8524 memcpy (new_relocs + insert_at + 1,
8525 (*internal_relocs_p) + insert_at,
8526 (sec->reloc_count - insert_at)
8527 * sizeof (Elf_Internal_Rela));
8529 if (*internal_relocs_p != relax_info->allocated_relocs)
8531 /* The first time we re-allocate, we can only free the
8532 old relocs if they were allocated with bfd_malloc.
8533 This is not true when keep_memory is in effect. */
8534 if (!link_info->keep_memory)
8535 free (*internal_relocs_p);
8538 free (*internal_relocs_p);
8539 relax_info->allocated_relocs = new_relocs;
8540 relax_info->allocated_relocs_count = new_relocs_count;
8541 elf_section_data (sec)->relocs = new_relocs;
8543 relax_info->relocs_count = sec->reloc_count;
8544 *internal_relocs_p = new_relocs;
8548 if (insert_at != sec->reloc_count)
8551 for (idx = sec->reloc_count; idx > insert_at; idx--)
8552 (*internal_relocs_p)[idx] = (*internal_relocs_p)[idx-1];
8554 (*internal_relocs_p)[insert_at] = this_rela;
8556 if (relax_info->allocated_relocs)
8557 relax_info->relocs_count = sec->reloc_count;
8564 /* This is similar to relax_section except that when a target is moved,
8565 we shift addresses up. We also need to modify the size. This
8566 algorithm does NOT allow for relocations into the middle of the
8567 property sections. */
8570 relax_property_section (bfd *abfd,
8572 struct bfd_link_info *link_info)
8574 Elf_Internal_Rela *internal_relocs;
8577 bfd_boolean ok = TRUE;
8578 bfd_boolean is_full_prop_section;
8579 size_t last_zfill_target_offset = 0;
8580 asection *last_zfill_target_sec = NULL;
8581 bfd_size_type sec_size;
8583 sec_size = bfd_get_section_limit (abfd, sec);
8584 internal_relocs = retrieve_internal_relocs (abfd, sec,
8585 link_info->keep_memory);
8586 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
8587 if (contents == NULL && sec_size != 0)
8593 is_full_prop_section =
8594 ((strcmp (sec->name, XTENSA_PROP_SEC_NAME) == 0)
8595 || (strncmp (sec->name, ".gnu.linkonce.prop.",
8596 sizeof ".gnu.linkonce.prop." - 1) == 0));
8598 if (internal_relocs)
8600 for (i = 0; i < sec->reloc_count; i++)
8602 Elf_Internal_Rela *irel;
8603 xtensa_relax_info *target_relax_info;
8605 asection *target_sec;
8607 bfd_byte *size_p, *flags_p;
8609 /* Locally change the source address.
8610 Translate the target to the new target address.
8611 If it points to this section and has been removed, MOVE IT.
8612 Also, don't forget to modify the associated SIZE at
8615 irel = &internal_relocs[i];
8616 r_type = ELF32_R_TYPE (irel->r_info);
8617 if (r_type == R_XTENSA_NONE)
8620 /* Find the literal value. */
8621 r_reloc_init (&val.r_rel, abfd, irel, contents, sec_size);
8622 size_p = &contents[irel->r_offset + 4];
8624 if (is_full_prop_section)
8626 flags_p = &contents[irel->r_offset + 8];
8627 BFD_ASSERT (irel->r_offset + 12 <= sec_size);
8630 BFD_ASSERT (irel->r_offset + 8 <= sec_size);
8632 target_sec = r_reloc_get_section (&val.r_rel);
8633 target_relax_info = get_xtensa_relax_info (target_sec);
8635 if (target_relax_info
8636 && (target_relax_info->is_relaxable_literal_section
8637 || target_relax_info->is_relaxable_asm_section ))
8639 /* Translate the relocation's destination. */
8640 bfd_vma new_offset, new_end_offset;
8641 long old_size, new_size;
8643 new_offset = offset_with_removed_text
8644 (&target_relax_info->action_list, val.r_rel.target_offset);
8646 /* Assert that we are not out of bounds. */
8647 old_size = bfd_get_32 (abfd, size_p);
8651 /* Only the first zero-sized unreachable entry is
8652 allowed to expand. In this case the new offset
8653 should be the offset before the fill and the new
8654 size is the expansion size. For other zero-sized
8655 entries the resulting size should be zero with an
8656 offset before or after the fill address depending
8657 on whether the expanding unreachable entry
8659 if (last_zfill_target_sec
8660 && last_zfill_target_sec == target_sec
8661 && last_zfill_target_offset == val.r_rel.target_offset)
8662 new_end_offset = new_offset;
8665 new_end_offset = new_offset;
8666 new_offset = offset_with_removed_text_before_fill
8667 (&target_relax_info->action_list,
8668 val.r_rel.target_offset);
8670 /* If it is not unreachable and we have not yet
8671 seen an unreachable at this address, place it
8672 before the fill address. */
8674 || (bfd_get_32 (abfd, flags_p)
8675 & XTENSA_PROP_UNREACHABLE) == 0)
8676 new_end_offset = new_offset;
8679 last_zfill_target_sec = target_sec;
8680 last_zfill_target_offset = val.r_rel.target_offset;
8686 new_end_offset = offset_with_removed_text_before_fill
8687 (&target_relax_info->action_list,
8688 val.r_rel.target_offset + old_size);
8691 new_size = new_end_offset - new_offset;
8693 if (new_size != old_size)
8695 bfd_put_32 (abfd, new_size, size_p);
8696 pin_contents (sec, contents);
8699 if (new_offset != val.r_rel.target_offset)
8701 bfd_vma diff = new_offset - val.r_rel.target_offset;
8702 irel->r_addend += diff;
8703 pin_internal_relocs (sec, internal_relocs);
8709 /* Combine adjacent property table entries. This is also done in
8710 finish_dynamic_sections() but at that point it's too late to
8711 reclaim the space in the output section, so we do this twice. */
8713 if (internal_relocs && (!link_info->relocatable
8714 || strcmp (sec->name, XTENSA_LIT_SEC_NAME) == 0))
8716 Elf_Internal_Rela *last_irel = NULL;
8717 int removed_bytes = 0;
8718 bfd_vma offset, last_irel_offset;
8719 bfd_vma section_size;
8720 bfd_size_type entry_size;
8721 flagword predef_flags;
8723 if (is_full_prop_section)
8728 predef_flags = xtensa_get_property_predef_flags (sec);
8730 /* Walk over memory and irels at the same time.
8731 This REQUIRES that the internal_relocs be sorted by offset. */
8732 qsort (internal_relocs, sec->reloc_count, sizeof (Elf_Internal_Rela),
8733 internal_reloc_compare);
8734 nexti = 0; /* Index into internal_relocs. */
8736 pin_internal_relocs (sec, internal_relocs);
8737 pin_contents (sec, contents);
8739 last_irel_offset = (bfd_vma) -1;
8740 section_size = sec->size;
8741 BFD_ASSERT (section_size % entry_size == 0);
8743 for (offset = 0; offset < section_size; offset += entry_size)
8745 Elf_Internal_Rela *irel, *next_irel;
8746 bfd_vma bytes_to_remove, size, actual_offset;
8747 bfd_boolean remove_this_irel;
8753 /* Find the next two relocations (if there are that many left),
8754 skipping over any R_XTENSA_NONE relocs. On entry, "nexti" is
8755 the starting reloc index. After these two loops, "i"
8756 is the index of the first non-NONE reloc past that starting
8757 index, and "nexti" is the index for the next non-NONE reloc
8760 for (i = nexti; i < sec->reloc_count; i++)
8762 if (ELF32_R_TYPE (internal_relocs[i].r_info) != R_XTENSA_NONE)
8764 irel = &internal_relocs[i];
8767 internal_relocs[i].r_offset -= removed_bytes;
8770 for (nexti = i + 1; nexti < sec->reloc_count; nexti++)
8772 if (ELF32_R_TYPE (internal_relocs[nexti].r_info)
8775 next_irel = &internal_relocs[nexti];
8778 internal_relocs[nexti].r_offset -= removed_bytes;
8781 remove_this_irel = FALSE;
8782 bytes_to_remove = 0;
8783 actual_offset = offset - removed_bytes;
8784 size = bfd_get_32 (abfd, &contents[actual_offset + 4]);
8786 if (is_full_prop_section)
8787 flags = bfd_get_32 (abfd, &contents[actual_offset + 8]);
8789 flags = predef_flags;
8791 /* Check that the irels are sorted by offset,
8792 with only one per address. */
8793 BFD_ASSERT (!irel || (int) irel->r_offset > (int) last_irel_offset);
8794 BFD_ASSERT (!next_irel || next_irel->r_offset > irel->r_offset);
8796 /* Make sure there aren't relocs on the size or flag fields. */
8797 if ((irel && irel->r_offset == offset + 4)
8798 || (is_full_prop_section
8799 && irel && irel->r_offset == offset + 8))
8801 irel->r_offset -= removed_bytes;
8802 last_irel_offset = irel->r_offset;
8804 else if (next_irel && (next_irel->r_offset == offset + 4
8805 || (is_full_prop_section
8806 && next_irel->r_offset == offset + 8)))
8809 irel->r_offset -= removed_bytes;
8810 next_irel->r_offset -= removed_bytes;
8811 last_irel_offset = next_irel->r_offset;
8813 else if (size == 0 && (flags & XTENSA_PROP_ALIGN) == 0
8814 && (flags & XTENSA_PROP_UNREACHABLE) == 0)
8816 /* Always remove entries with zero size and no alignment. */
8817 bytes_to_remove = entry_size;
8818 if (irel && irel->r_offset == offset)
8820 remove_this_irel = TRUE;
8822 irel->r_offset -= removed_bytes;
8823 last_irel_offset = irel->r_offset;
8826 else if (irel && irel->r_offset == offset)
8828 if (ELF32_R_TYPE (irel->r_info) == R_XTENSA_32)
8834 bfd_get_32 (abfd, &contents[last_irel->r_offset + 4]);
8835 bfd_vma old_address =
8836 (last_irel->r_addend
8837 + bfd_get_32 (abfd, &contents[last_irel->r_offset]));
8838 bfd_vma new_address =
8840 + bfd_get_32 (abfd, &contents[actual_offset]));
8841 if (is_full_prop_section)
8842 old_flags = bfd_get_32
8843 (abfd, &contents[last_irel->r_offset + 8]);
8845 old_flags = predef_flags;
8847 if ((ELF32_R_SYM (irel->r_info)
8848 == ELF32_R_SYM (last_irel->r_info))
8849 && old_address + old_size == new_address
8850 && old_flags == flags
8851 && (old_flags & XTENSA_PROP_INSN_BRANCH_TARGET) == 0
8852 && (old_flags & XTENSA_PROP_INSN_LOOP_TARGET) == 0)
8854 /* Fix the old size. */
8855 bfd_put_32 (abfd, old_size + size,
8856 &contents[last_irel->r_offset + 4]);
8857 bytes_to_remove = entry_size;
8858 remove_this_irel = TRUE;
8867 irel->r_offset -= removed_bytes;
8868 last_irel_offset = irel->r_offset;
8871 if (remove_this_irel)
8873 irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
8874 irel->r_offset -= bytes_to_remove;
8877 if (bytes_to_remove != 0)
8879 removed_bytes += bytes_to_remove;
8880 if (offset + bytes_to_remove < section_size)
8881 memmove (&contents[actual_offset],
8882 &contents[actual_offset + bytes_to_remove],
8883 section_size - offset - bytes_to_remove);
8889 /* Clear the removed bytes. */
8890 memset (&contents[section_size - removed_bytes], 0, removed_bytes);
8892 sec->size = section_size - removed_bytes;
8894 if (xtensa_is_littable_section (sec))
8896 bfd *dynobj = elf_hash_table (link_info)->dynobj;
8900 bfd_get_section_by_name (dynobj, ".got.loc");
8902 sgotloc->size -= removed_bytes;
8909 release_internal_relocs (sec, internal_relocs);
8910 release_contents (sec, contents);
8915 /* Third relaxation pass. */
8917 /* Change symbol values to account for removed literals. */
8920 relax_section_symbols (bfd *abfd, asection *sec)
8922 xtensa_relax_info *relax_info;
8923 unsigned int sec_shndx;
8924 Elf_Internal_Shdr *symtab_hdr;
8925 Elf_Internal_Sym *isymbuf;
8926 unsigned i, num_syms, num_locals;
8928 relax_info = get_xtensa_relax_info (sec);
8929 BFD_ASSERT (relax_info);
8931 if (!relax_info->is_relaxable_literal_section
8932 && !relax_info->is_relaxable_asm_section)
8935 sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
8937 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
8938 isymbuf = retrieve_local_syms (abfd);
8940 num_syms = symtab_hdr->sh_size / sizeof (Elf32_External_Sym);
8941 num_locals = symtab_hdr->sh_info;
8943 /* Adjust the local symbols defined in this section. */
8944 for (i = 0; i < num_locals; i++)
8946 Elf_Internal_Sym *isym = &isymbuf[i];
8948 if (isym->st_shndx == sec_shndx)
8950 bfd_vma new_address = offset_with_removed_text
8951 (&relax_info->action_list, isym->st_value);
8952 bfd_vma new_size = isym->st_size;
8954 if (ELF32_ST_TYPE (isym->st_info) == STT_FUNC)
8956 bfd_vma new_end = offset_with_removed_text
8957 (&relax_info->action_list, isym->st_value + isym->st_size);
8958 new_size = new_end - new_address;
8961 isym->st_value = new_address;
8962 isym->st_size = new_size;
8966 /* Now adjust the global symbols defined in this section. */
8967 for (i = 0; i < (num_syms - num_locals); i++)
8969 struct elf_link_hash_entry *sym_hash;
8971 sym_hash = elf_sym_hashes (abfd)[i];
8973 if (sym_hash->root.type == bfd_link_hash_warning)
8974 sym_hash = (struct elf_link_hash_entry *) sym_hash->root.u.i.link;
8976 if ((sym_hash->root.type == bfd_link_hash_defined
8977 || sym_hash->root.type == bfd_link_hash_defweak)
8978 && sym_hash->root.u.def.section == sec)
8980 bfd_vma new_address = offset_with_removed_text
8981 (&relax_info->action_list, sym_hash->root.u.def.value);
8982 bfd_vma new_size = sym_hash->size;
8984 if (sym_hash->type == STT_FUNC)
8986 bfd_vma new_end = offset_with_removed_text
8987 (&relax_info->action_list,
8988 sym_hash->root.u.def.value + sym_hash->size);
8989 new_size = new_end - new_address;
8992 sym_hash->root.u.def.value = new_address;
8993 sym_hash->size = new_size;
9001 /* "Fix" handling functions, called while performing relocations. */
9004 do_fix_for_relocatable_link (Elf_Internal_Rela *rel,
9006 asection *input_section,
9010 asection *sec, *old_sec;
9012 int r_type = ELF32_R_TYPE (rel->r_info);
9015 if (r_type == R_XTENSA_NONE)
9018 fix = get_bfd_fix (input_section, rel->r_offset, r_type);
9022 r_reloc_init (&r_rel, input_bfd, rel, contents,
9023 bfd_get_section_limit (input_bfd, input_section));
9024 old_sec = r_reloc_get_section (&r_rel);
9025 old_offset = r_rel.target_offset;
9027 if (!old_sec || !r_reloc_is_defined (&r_rel))
9029 if (r_type != R_XTENSA_ASM_EXPAND)
9031 (*_bfd_error_handler)
9032 (_("%B(%A+0x%lx): unexpected fix for %s relocation"),
9033 input_bfd, input_section, rel->r_offset,
9034 elf_howto_table[r_type].name);
9037 /* Leave it be. Resolution will happen in a later stage. */
9041 sec = fix->target_sec;
9042 rel->r_addend += ((sec->output_offset + fix->target_offset)
9043 - (old_sec->output_offset + old_offset));
9050 do_fix_for_final_link (Elf_Internal_Rela *rel,
9052 asection *input_section,
9054 bfd_vma *relocationp)
9057 int r_type = ELF32_R_TYPE (rel->r_info);
9061 if (r_type == R_XTENSA_NONE)
9064 fix = get_bfd_fix (input_section, rel->r_offset, r_type);
9068 sec = fix->target_sec;
9070 fixup_diff = rel->r_addend;
9071 if (elf_howto_table[fix->src_type].partial_inplace)
9073 bfd_vma inplace_val;
9074 BFD_ASSERT (fix->src_offset
9075 < bfd_get_section_limit (input_bfd, input_section));
9076 inplace_val = bfd_get_32 (input_bfd, &contents[fix->src_offset]);
9077 fixup_diff += inplace_val;
9080 *relocationp = (sec->output_section->vma
9081 + sec->output_offset
9082 + fix->target_offset - fixup_diff);
9086 /* Miscellaneous utility functions.... */
9089 elf_xtensa_get_plt_section (bfd *dynobj, int chunk)
9094 return bfd_get_section_by_name (dynobj, ".plt");
9096 sprintf (plt_name, ".plt.%u", chunk);
9097 return bfd_get_section_by_name (dynobj, plt_name);
9102 elf_xtensa_get_gotplt_section (bfd *dynobj, int chunk)
9107 return bfd_get_section_by_name (dynobj, ".got.plt");
9109 sprintf (got_name, ".got.plt.%u", chunk);
9110 return bfd_get_section_by_name (dynobj, got_name);
9114 /* Get the input section for a given symbol index.
9116 . a section symbol, return the section;
9117 . a common symbol, return the common section;
9118 . an undefined symbol, return the undefined section;
9119 . an indirect symbol, follow the links;
9120 . an absolute value, return the absolute section. */
9123 get_elf_r_symndx_section (bfd *abfd, unsigned long r_symndx)
9125 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
9126 asection *target_sec = NULL;
9127 if (r_symndx < symtab_hdr->sh_info)
9129 Elf_Internal_Sym *isymbuf;
9130 unsigned int section_index;
9132 isymbuf = retrieve_local_syms (abfd);
9133 section_index = isymbuf[r_symndx].st_shndx;
9135 if (section_index == SHN_UNDEF)
9136 target_sec = bfd_und_section_ptr;
9137 else if (section_index > 0 && section_index < SHN_LORESERVE)
9138 target_sec = bfd_section_from_elf_index (abfd, section_index);
9139 else if (section_index == SHN_ABS)
9140 target_sec = bfd_abs_section_ptr;
9141 else if (section_index == SHN_COMMON)
9142 target_sec = bfd_com_section_ptr;
9149 unsigned long indx = r_symndx - symtab_hdr->sh_info;
9150 struct elf_link_hash_entry *h = elf_sym_hashes (abfd)[indx];
9152 while (h->root.type == bfd_link_hash_indirect
9153 || h->root.type == bfd_link_hash_warning)
9154 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9156 switch (h->root.type)
9158 case bfd_link_hash_defined:
9159 case bfd_link_hash_defweak:
9160 target_sec = h->root.u.def.section;
9162 case bfd_link_hash_common:
9163 target_sec = bfd_com_section_ptr;
9165 case bfd_link_hash_undefined:
9166 case bfd_link_hash_undefweak:
9167 target_sec = bfd_und_section_ptr;
9169 default: /* New indirect warning. */
9170 target_sec = bfd_und_section_ptr;
9178 static struct elf_link_hash_entry *
9179 get_elf_r_symndx_hash_entry (bfd *abfd, unsigned long r_symndx)
9182 struct elf_link_hash_entry *h;
9183 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
9185 if (r_symndx < symtab_hdr->sh_info)
9188 indx = r_symndx - symtab_hdr->sh_info;
9189 h = elf_sym_hashes (abfd)[indx];
9190 while (h->root.type == bfd_link_hash_indirect
9191 || h->root.type == bfd_link_hash_warning)
9192 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9197 /* Get the section-relative offset for a symbol number. */
9200 get_elf_r_symndx_offset (bfd *abfd, unsigned long r_symndx)
9202 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
9205 if (r_symndx < symtab_hdr->sh_info)
9207 Elf_Internal_Sym *isymbuf;
9208 isymbuf = retrieve_local_syms (abfd);
9209 offset = isymbuf[r_symndx].st_value;
9213 unsigned long indx = r_symndx - symtab_hdr->sh_info;
9214 struct elf_link_hash_entry *h =
9215 elf_sym_hashes (abfd)[indx];
9217 while (h->root.type == bfd_link_hash_indirect
9218 || h->root.type == bfd_link_hash_warning)
9219 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9220 if (h->root.type == bfd_link_hash_defined
9221 || h->root.type == bfd_link_hash_defweak)
9222 offset = h->root.u.def.value;
9229 is_reloc_sym_weak (bfd *abfd, Elf_Internal_Rela *rel)
9231 unsigned long r_symndx = ELF32_R_SYM (rel->r_info);
9232 struct elf_link_hash_entry *h;
9234 h = get_elf_r_symndx_hash_entry (abfd, r_symndx);
9235 if (h && h->root.type == bfd_link_hash_defweak)
9242 pcrel_reloc_fits (xtensa_opcode opc,
9244 bfd_vma self_address,
9245 bfd_vma dest_address)
9247 xtensa_isa isa = xtensa_default_isa;
9248 uint32 valp = dest_address;
9249 if (xtensa_operand_do_reloc (isa, opc, opnd, &valp, self_address)
9250 || xtensa_operand_encode (isa, opc, opnd, &valp))
9256 static int linkonce_len = sizeof (".gnu.linkonce.") - 1;
9257 static int insn_sec_len = sizeof (XTENSA_INSN_SEC_NAME) - 1;
9258 static int lit_sec_len = sizeof (XTENSA_LIT_SEC_NAME) - 1;
9259 static int prop_sec_len = sizeof (XTENSA_PROP_SEC_NAME) - 1;
9263 xtensa_is_property_section (asection *sec)
9265 if (strncmp (XTENSA_INSN_SEC_NAME, sec->name, insn_sec_len) == 0
9266 || strncmp (XTENSA_LIT_SEC_NAME, sec->name, lit_sec_len) == 0
9267 || strncmp (XTENSA_PROP_SEC_NAME, sec->name, prop_sec_len) == 0)
9270 if (strncmp (".gnu.linkonce.", sec->name, linkonce_len) == 0
9271 && (strncmp (&sec->name[linkonce_len], "x.", 2) == 0
9272 || strncmp (&sec->name[linkonce_len], "p.", 2) == 0
9273 || strncmp (&sec->name[linkonce_len], "prop.", 5) == 0))
9281 xtensa_is_littable_section (asection *sec)
9283 if (strncmp (XTENSA_LIT_SEC_NAME, sec->name, lit_sec_len) == 0)
9286 if (strncmp (".gnu.linkonce.", sec->name, linkonce_len) == 0
9287 && sec->name[linkonce_len] == 'p'
9288 && sec->name[linkonce_len + 1] == '.')
9296 internal_reloc_compare (const void *ap, const void *bp)
9298 const Elf_Internal_Rela *a = (const Elf_Internal_Rela *) ap;
9299 const Elf_Internal_Rela *b = (const Elf_Internal_Rela *) bp;
9301 if (a->r_offset != b->r_offset)
9302 return (a->r_offset - b->r_offset);
9304 /* We don't need to sort on these criteria for correctness,
9305 but enforcing a more strict ordering prevents unstable qsort
9306 from behaving differently with different implementations.
9307 Without the code below we get correct but different results
9308 on Solaris 2.7 and 2.8. We would like to always produce the
9309 same results no matter the host. */
9311 if (a->r_info != b->r_info)
9312 return (a->r_info - b->r_info);
9314 return (a->r_addend - b->r_addend);
9319 internal_reloc_matches (const void *ap, const void *bp)
9321 const Elf_Internal_Rela *a = (const Elf_Internal_Rela *) ap;
9322 const Elf_Internal_Rela *b = (const Elf_Internal_Rela *) bp;
9324 /* Check if one entry overlaps with the other; this shouldn't happen
9325 except when searching for a match. */
9326 return (a->r_offset - b->r_offset);
9331 xtensa_get_property_section_name (asection *sec, const char *base_name)
9333 if (strncmp (sec->name, ".gnu.linkonce.", linkonce_len) == 0)
9335 char *prop_sec_name;
9337 char *linkonce_kind = 0;
9339 if (strcmp (base_name, XTENSA_INSN_SEC_NAME) == 0)
9340 linkonce_kind = "x.";
9341 else if (strcmp (base_name, XTENSA_LIT_SEC_NAME) == 0)
9342 linkonce_kind = "p.";
9343 else if (strcmp (base_name, XTENSA_PROP_SEC_NAME) == 0)
9344 linkonce_kind = "prop.";
9348 prop_sec_name = (char *) bfd_malloc (strlen (sec->name)
9349 + strlen (linkonce_kind) + 1);
9350 memcpy (prop_sec_name, ".gnu.linkonce.", linkonce_len);
9351 strcpy (prop_sec_name + linkonce_len, linkonce_kind);
9353 suffix = sec->name + linkonce_len;
9354 /* For backward compatibility, replace "t." instead of inserting
9355 the new linkonce_kind (but not for "prop" sections). */
9356 if (strncmp (suffix, "t.", 2) == 0 && linkonce_kind[1] == '.')
9358 strcat (prop_sec_name + linkonce_len, suffix);
9360 return prop_sec_name;
9363 return strdup (base_name);
9368 xtensa_get_property_predef_flags (asection *sec)
9370 if (strcmp (sec->name, XTENSA_INSN_SEC_NAME) == 0
9371 || strncmp (sec->name, ".gnu.linkonce.x.",
9372 sizeof ".gnu.linkonce.x." - 1) == 0)
9373 return (XTENSA_PROP_INSN
9374 | XTENSA_PROP_INSN_NO_TRANSFORM
9375 | XTENSA_PROP_INSN_NO_REORDER);
9377 if (xtensa_is_littable_section (sec))
9378 return (XTENSA_PROP_LITERAL
9379 | XTENSA_PROP_INSN_NO_TRANSFORM
9380 | XTENSA_PROP_INSN_NO_REORDER);
9386 /* Other functions called directly by the linker. */
9389 xtensa_callback_required_dependence (bfd *abfd,
9391 struct bfd_link_info *link_info,
9392 deps_callback_t callback,
9395 Elf_Internal_Rela *internal_relocs;
9398 bfd_boolean ok = TRUE;
9399 bfd_size_type sec_size;
9401 sec_size = bfd_get_section_limit (abfd, sec);
9403 /* ".plt*" sections have no explicit relocations but they contain L32R
9404 instructions that reference the corresponding ".got.plt*" sections. */
9405 if ((sec->flags & SEC_LINKER_CREATED) != 0
9406 && strncmp (sec->name, ".plt", 4) == 0)
9410 /* Find the corresponding ".got.plt*" section. */
9411 if (sec->name[4] == '\0')
9412 sgotplt = bfd_get_section_by_name (sec->owner, ".got.plt");
9418 BFD_ASSERT (sec->name[4] == '.');
9419 chunk = strtol (&sec->name[5], NULL, 10);
9421 sprintf (got_name, ".got.plt.%u", chunk);
9422 sgotplt = bfd_get_section_by_name (sec->owner, got_name);
9424 BFD_ASSERT (sgotplt);
9426 /* Assume worst-case offsets: L32R at the very end of the ".plt"
9427 section referencing a literal at the very beginning of
9428 ".got.plt". This is very close to the real dependence, anyway. */
9429 (*callback) (sec, sec_size, sgotplt, 0, closure);
9432 internal_relocs = retrieve_internal_relocs (abfd, sec,
9433 link_info->keep_memory);
9434 if (internal_relocs == NULL
9435 || sec->reloc_count == 0)
9438 /* Cache the contents for the duration of this scan. */
9439 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
9440 if (contents == NULL && sec_size != 0)
9446 if (!xtensa_default_isa)
9447 xtensa_default_isa = xtensa_isa_init (0, 0);
9449 for (i = 0; i < sec->reloc_count; i++)
9451 Elf_Internal_Rela *irel = &internal_relocs[i];
9452 if (is_l32r_relocation (abfd, sec, contents, irel))
9455 asection *target_sec;
9456 bfd_vma target_offset;
9458 r_reloc_init (&l32r_rel, abfd, irel, contents, sec_size);
9461 /* L32Rs must be local to the input file. */
9462 if (r_reloc_is_defined (&l32r_rel))
9464 target_sec = r_reloc_get_section (&l32r_rel);
9465 target_offset = l32r_rel.target_offset;
9467 (*callback) (sec, irel->r_offset, target_sec, target_offset,
9473 release_internal_relocs (sec, internal_relocs);
9474 release_contents (sec, contents);
9478 /* The default literal sections should always be marked as "code" (i.e.,
9479 SHF_EXECINSTR). This is particularly important for the Linux kernel
9480 module loader so that the literals are not placed after the text. */
9481 static const struct bfd_elf_special_section elf_xtensa_special_sections[] =
9483 { ".fini.literal", 13, 0, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR },
9484 { ".init.literal", 13, 0, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR },
9485 { ".literal", 8, 0, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR },
9486 { NULL, 0, 0, 0, 0 }
9490 #define TARGET_LITTLE_SYM bfd_elf32_xtensa_le_vec
9491 #define TARGET_LITTLE_NAME "elf32-xtensa-le"
9492 #define TARGET_BIG_SYM bfd_elf32_xtensa_be_vec
9493 #define TARGET_BIG_NAME "elf32-xtensa-be"
9494 #define ELF_ARCH bfd_arch_xtensa
9496 /* The new EM_XTENSA value will be recognized beginning in the Xtensa T1040
9497 release. However, we still have to generate files with the EM_XTENSA_OLD
9498 value so that pre-T1040 tools can read the files. As soon as we stop
9499 caring about pre-T1040 tools, the following two values should be
9500 swapped. At the same time, any other code that uses EM_XTENSA_OLD
9501 should be changed to use EM_XTENSA. */
9502 #define ELF_MACHINE_CODE EM_XTENSA_OLD
9503 #define ELF_MACHINE_ALT1 EM_XTENSA
9506 #define ELF_MAXPAGESIZE (1 << XCHAL_MMU_MIN_PTE_PAGE_SIZE)
9507 #else /* !XCHAL_HAVE_MMU */
9508 #define ELF_MAXPAGESIZE 1
9509 #endif /* !XCHAL_HAVE_MMU */
9510 #endif /* ELF_ARCH */
9512 #define elf_backend_can_gc_sections 1
9513 #define elf_backend_can_refcount 1
9514 #define elf_backend_plt_readonly 1
9515 #define elf_backend_got_header_size 4
9516 #define elf_backend_want_dynbss 0
9517 #define elf_backend_want_got_plt 1
9519 #define elf_info_to_howto elf_xtensa_info_to_howto_rela
9521 #define bfd_elf32_bfd_merge_private_bfd_data elf_xtensa_merge_private_bfd_data
9522 #define bfd_elf32_new_section_hook elf_xtensa_new_section_hook
9523 #define bfd_elf32_bfd_print_private_bfd_data elf_xtensa_print_private_bfd_data
9524 #define bfd_elf32_bfd_relax_section elf_xtensa_relax_section
9525 #define bfd_elf32_bfd_reloc_type_lookup elf_xtensa_reloc_type_lookup
9526 #define bfd_elf32_bfd_set_private_flags elf_xtensa_set_private_flags
9528 #define elf_backend_adjust_dynamic_symbol elf_xtensa_adjust_dynamic_symbol
9529 #define elf_backend_check_relocs elf_xtensa_check_relocs
9530 #define elf_backend_create_dynamic_sections elf_xtensa_create_dynamic_sections
9531 #define elf_backend_discard_info elf_xtensa_discard_info
9532 #define elf_backend_ignore_discarded_relocs elf_xtensa_ignore_discarded_relocs
9533 #define elf_backend_final_write_processing elf_xtensa_final_write_processing
9534 #define elf_backend_finish_dynamic_sections elf_xtensa_finish_dynamic_sections
9535 #define elf_backend_finish_dynamic_symbol elf_xtensa_finish_dynamic_symbol
9536 #define elf_backend_gc_mark_hook elf_xtensa_gc_mark_hook
9537 #define elf_backend_gc_sweep_hook elf_xtensa_gc_sweep_hook
9538 #define elf_backend_grok_prstatus elf_xtensa_grok_prstatus
9539 #define elf_backend_grok_psinfo elf_xtensa_grok_psinfo
9540 #define elf_backend_hide_symbol elf_xtensa_hide_symbol
9541 #define elf_backend_modify_segment_map elf_xtensa_modify_segment_map
9542 #define elf_backend_object_p elf_xtensa_object_p
9543 #define elf_backend_reloc_type_class elf_xtensa_reloc_type_class
9544 #define elf_backend_relocate_section elf_xtensa_relocate_section
9545 #define elf_backend_size_dynamic_sections elf_xtensa_size_dynamic_sections
9546 #define elf_backend_special_sections elf_xtensa_special_sections
9548 #include "elf32-target.h"