1 /* Xtensa-specific support for 32-bit ELF.
2 Copyright 2003, 2004, 2005, 2006 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 *vsprint_msg (const char *, const char *, int, ...) ATTRIBUTE_PRINTF(2,4);
40 static bfd_reloc_status_type bfd_elf_xtensa_reloc
41 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
42 static bfd_boolean do_fix_for_relocatable_link
43 (Elf_Internal_Rela *, bfd *, asection *, bfd_byte *);
44 static void do_fix_for_final_link
45 (Elf_Internal_Rela *, bfd *, asection *, bfd_byte *, bfd_vma *);
47 /* Local functions to handle Xtensa configurability. */
49 static bfd_boolean is_indirect_call_opcode (xtensa_opcode);
50 static bfd_boolean is_direct_call_opcode (xtensa_opcode);
51 static bfd_boolean is_windowed_call_opcode (xtensa_opcode);
52 static xtensa_opcode get_const16_opcode (void);
53 static xtensa_opcode get_l32r_opcode (void);
54 static bfd_vma l32r_offset (bfd_vma, bfd_vma);
55 static int get_relocation_opnd (xtensa_opcode, int);
56 static int get_relocation_slot (int);
57 static xtensa_opcode get_relocation_opcode
58 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *);
59 static bfd_boolean is_l32r_relocation
60 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *);
61 static bfd_boolean is_alt_relocation (int);
62 static bfd_boolean is_operand_relocation (int);
63 static bfd_size_type insn_decode_len
64 (bfd_byte *, bfd_size_type, bfd_size_type);
65 static xtensa_opcode insn_decode_opcode
66 (bfd_byte *, bfd_size_type, bfd_size_type, int);
67 static bfd_boolean check_branch_target_aligned
68 (bfd_byte *, bfd_size_type, bfd_vma, bfd_vma);
69 static bfd_boolean check_loop_aligned
70 (bfd_byte *, bfd_size_type, bfd_vma, bfd_vma);
71 static bfd_boolean check_branch_target_aligned_address (bfd_vma, int);
72 static bfd_size_type get_asm_simplify_size
73 (bfd_byte *, bfd_size_type, bfd_size_type);
75 /* Functions for link-time code simplifications. */
77 static bfd_reloc_status_type elf_xtensa_do_asm_simplify
78 (bfd_byte *, bfd_vma, bfd_vma, char **);
79 static bfd_reloc_status_type contract_asm_expansion
80 (bfd_byte *, bfd_vma, Elf_Internal_Rela *, char **);
81 static xtensa_opcode swap_callx_for_call_opcode (xtensa_opcode);
82 static xtensa_opcode get_expanded_call_opcode (bfd_byte *, int, bfd_boolean *);
84 /* Access to internal relocations, section contents and symbols. */
86 static Elf_Internal_Rela *retrieve_internal_relocs
87 (bfd *, asection *, bfd_boolean);
88 static void pin_internal_relocs (asection *, Elf_Internal_Rela *);
89 static void release_internal_relocs (asection *, Elf_Internal_Rela *);
90 static bfd_byte *retrieve_contents (bfd *, asection *, bfd_boolean);
91 static void pin_contents (asection *, bfd_byte *);
92 static void release_contents (asection *, bfd_byte *);
93 static Elf_Internal_Sym *retrieve_local_syms (bfd *);
95 /* Miscellaneous utility functions. */
97 static asection *elf_xtensa_get_plt_section (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 asection *xtensa_get_property_section (asection *, const char *);
110 static flagword xtensa_get_property_predef_flags (asection *);
112 /* Other functions called directly by the linker. */
114 typedef void (*deps_callback_t)
115 (asection *, bfd_vma, asection *, bfd_vma, void *);
116 extern bfd_boolean xtensa_callback_required_dependence
117 (bfd *, asection *, struct bfd_link_info *, deps_callback_t, void *);
120 /* Globally visible flag for choosing size optimization of NOP removal
121 instead of branch-target-aware minimization for NOP removal.
122 When nonzero, narrow all instructions and remove all NOPs possible
123 around longcall expansions. */
125 int elf32xtensa_size_opt;
128 /* The "new_section_hook" is used to set up a per-section
129 "xtensa_relax_info" data structure with additional information used
130 during relaxation. */
132 typedef struct xtensa_relax_info_struct xtensa_relax_info;
135 /* 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 bfd_size_type table_size = 0;
575 bfd_byte *table_data;
576 property_table_entry *blocks;
577 int blk, block_count;
578 bfd_size_type num_records;
579 Elf_Internal_Rela *internal_relocs;
580 bfd_vma section_addr;
581 flagword predef_flags;
582 bfd_size_type table_entry_size;
585 || !(section->flags & SEC_ALLOC)
586 || (section->flags & SEC_DEBUGGING))
592 table_section = xtensa_get_property_section (section, sec_name);
594 table_size = table_section->size;
602 predef_flags = xtensa_get_property_predef_flags (table_section);
603 table_entry_size = 12;
605 table_entry_size -= 4;
607 num_records = table_size / table_entry_size;
608 table_data = retrieve_contents (abfd, table_section, TRUE);
609 blocks = (property_table_entry *)
610 bfd_malloc (num_records * sizeof (property_table_entry));
614 section_addr = section->output_section->vma + section->output_offset;
616 section_addr = section->vma;
618 /* If the file has not yet been relocated, process the relocations
619 and sort out the table entries that apply to the specified section. */
620 internal_relocs = retrieve_internal_relocs (abfd, table_section, TRUE);
621 if (internal_relocs && !table_section->reloc_done)
625 for (i = 0; i < table_section->reloc_count; i++)
627 Elf_Internal_Rela *rel = &internal_relocs[i];
628 unsigned long r_symndx;
630 if (ELF32_R_TYPE (rel->r_info) == R_XTENSA_NONE)
633 BFD_ASSERT (ELF32_R_TYPE (rel->r_info) == R_XTENSA_32);
634 r_symndx = ELF32_R_SYM (rel->r_info);
636 if (get_elf_r_symndx_section (abfd, r_symndx) == section)
638 bfd_vma sym_off = get_elf_r_symndx_offset (abfd, r_symndx);
639 BFD_ASSERT (sym_off == 0);
640 blocks[block_count].address =
641 (section_addr + sym_off + rel->r_addend
642 + bfd_get_32 (abfd, table_data + rel->r_offset));
643 blocks[block_count].size =
644 bfd_get_32 (abfd, table_data + rel->r_offset + 4);
646 blocks[block_count].flags = predef_flags;
648 blocks[block_count].flags =
649 bfd_get_32 (abfd, table_data + rel->r_offset + 8);
656 /* The file has already been relocated and the addresses are
657 already in the table. */
659 bfd_size_type section_limit = bfd_get_section_limit (abfd, section);
661 for (off = 0; off < table_size; off += table_entry_size)
663 bfd_vma address = bfd_get_32 (abfd, table_data + off);
665 if (address >= section_addr
666 && address < section_addr + section_limit)
668 blocks[block_count].address = address;
669 blocks[block_count].size =
670 bfd_get_32 (abfd, table_data + off + 4);
672 blocks[block_count].flags = predef_flags;
674 blocks[block_count].flags =
675 bfd_get_32 (abfd, table_data + off + 8);
681 release_contents (table_section, table_data);
682 release_internal_relocs (table_section, internal_relocs);
686 /* Now sort them into address order for easy reference. */
687 qsort (blocks, block_count, sizeof (property_table_entry),
688 property_table_compare);
690 /* Check that the table contents are valid. Problems may occur,
691 for example, if an unrelocated object file is stripped. */
692 for (blk = 1; blk < block_count; blk++)
694 /* The only circumstance where two entries may legitimately
695 have the same address is when one of them is a zero-size
696 placeholder to mark a place where fill can be inserted.
697 The zero-size entry should come first. */
698 if (blocks[blk - 1].address == blocks[blk].address &&
699 blocks[blk - 1].size != 0)
701 (*_bfd_error_handler) (_("%B(%A): invalid property table"),
703 bfd_set_error (bfd_error_bad_value);
715 static property_table_entry *
716 elf_xtensa_find_property_entry (property_table_entry *property_table,
717 int property_table_size,
720 property_table_entry entry;
721 property_table_entry *rv;
723 if (property_table_size == 0)
726 entry.address = addr;
730 rv = bsearch (&entry, property_table, property_table_size,
731 sizeof (property_table_entry), property_table_matches);
737 elf_xtensa_in_literal_pool (property_table_entry *lit_table,
741 if (elf_xtensa_find_property_entry (lit_table, lit_table_size, addr))
748 /* Look through the relocs for a section during the first phase, and
749 calculate needed space in the dynamic reloc sections. */
752 elf_xtensa_check_relocs (bfd *abfd,
753 struct bfd_link_info *info,
755 const Elf_Internal_Rela *relocs)
757 Elf_Internal_Shdr *symtab_hdr;
758 struct elf_link_hash_entry **sym_hashes;
759 const Elf_Internal_Rela *rel;
760 const Elf_Internal_Rela *rel_end;
762 if (info->relocatable)
765 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
766 sym_hashes = elf_sym_hashes (abfd);
768 rel_end = relocs + sec->reloc_count;
769 for (rel = relocs; rel < rel_end; rel++)
772 unsigned long r_symndx;
773 struct elf_link_hash_entry *h;
775 r_symndx = ELF32_R_SYM (rel->r_info);
776 r_type = ELF32_R_TYPE (rel->r_info);
778 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
780 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
785 if (r_symndx < symtab_hdr->sh_info)
789 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
790 while (h->root.type == bfd_link_hash_indirect
791 || h->root.type == bfd_link_hash_warning)
792 h = (struct elf_link_hash_entry *) h->root.u.i.link;
801 if ((sec->flags & SEC_ALLOC) != 0)
803 if (h->got.refcount <= 0)
806 h->got.refcount += 1;
811 /* If this relocation is against a local symbol, then it's
812 exactly the same as a normal local GOT entry. */
816 if ((sec->flags & SEC_ALLOC) != 0)
818 if (h->plt.refcount <= 0)
824 h->plt.refcount += 1;
826 /* Keep track of the total PLT relocation count even if we
827 don't yet know whether the dynamic sections will be
829 plt_reloc_count += 1;
831 if (elf_hash_table (info)->dynamic_sections_created)
833 if (!add_extra_plt_sections (elf_hash_table (info)->dynobj,
841 if ((sec->flags & SEC_ALLOC) != 0)
843 bfd_signed_vma *local_got_refcounts;
845 /* This is a global offset table entry for a local symbol. */
846 local_got_refcounts = elf_local_got_refcounts (abfd);
847 if (local_got_refcounts == NULL)
851 size = symtab_hdr->sh_info;
852 size *= sizeof (bfd_signed_vma);
853 local_got_refcounts =
854 (bfd_signed_vma *) bfd_zalloc (abfd, size);
855 if (local_got_refcounts == NULL)
857 elf_local_got_refcounts (abfd) = local_got_refcounts;
859 local_got_refcounts[r_symndx] += 1;
866 case R_XTENSA_SLOT0_OP:
867 case R_XTENSA_SLOT1_OP:
868 case R_XTENSA_SLOT2_OP:
869 case R_XTENSA_SLOT3_OP:
870 case R_XTENSA_SLOT4_OP:
871 case R_XTENSA_SLOT5_OP:
872 case R_XTENSA_SLOT6_OP:
873 case R_XTENSA_SLOT7_OP:
874 case R_XTENSA_SLOT8_OP:
875 case R_XTENSA_SLOT9_OP:
876 case R_XTENSA_SLOT10_OP:
877 case R_XTENSA_SLOT11_OP:
878 case R_XTENSA_SLOT12_OP:
879 case R_XTENSA_SLOT13_OP:
880 case R_XTENSA_SLOT14_OP:
881 case R_XTENSA_SLOT0_ALT:
882 case R_XTENSA_SLOT1_ALT:
883 case R_XTENSA_SLOT2_ALT:
884 case R_XTENSA_SLOT3_ALT:
885 case R_XTENSA_SLOT4_ALT:
886 case R_XTENSA_SLOT5_ALT:
887 case R_XTENSA_SLOT6_ALT:
888 case R_XTENSA_SLOT7_ALT:
889 case R_XTENSA_SLOT8_ALT:
890 case R_XTENSA_SLOT9_ALT:
891 case R_XTENSA_SLOT10_ALT:
892 case R_XTENSA_SLOT11_ALT:
893 case R_XTENSA_SLOT12_ALT:
894 case R_XTENSA_SLOT13_ALT:
895 case R_XTENSA_SLOT14_ALT:
896 case R_XTENSA_ASM_EXPAND:
897 case R_XTENSA_ASM_SIMPLIFY:
899 case R_XTENSA_DIFF16:
900 case R_XTENSA_DIFF32:
901 /* Nothing to do for these. */
904 case R_XTENSA_GNU_VTINHERIT:
905 /* This relocation describes the C++ object vtable hierarchy.
906 Reconstruct it for later use during GC. */
907 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
911 case R_XTENSA_GNU_VTENTRY:
912 /* This relocation describes which C++ vtable entries are actually
913 used. Record for later use during GC. */
914 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
928 elf_xtensa_make_sym_local (struct bfd_link_info *info,
929 struct elf_link_hash_entry *h)
933 if (h->plt.refcount > 0)
935 /* Will use RELATIVE relocs instead of JMP_SLOT relocs. */
936 if (h->got.refcount < 0)
938 h->got.refcount += h->plt.refcount;
944 /* Don't need any dynamic relocations at all. */
952 elf_xtensa_hide_symbol (struct bfd_link_info *info,
953 struct elf_link_hash_entry *h,
954 bfd_boolean force_local)
956 /* For a shared link, move the plt refcount to the got refcount to leave
957 space for RELATIVE relocs. */
958 elf_xtensa_make_sym_local (info, h);
960 _bfd_elf_link_hash_hide_symbol (info, h, force_local);
964 /* Return the section that should be marked against GC for a given
968 elf_xtensa_gc_mark_hook (asection *sec,
969 struct bfd_link_info *info ATTRIBUTE_UNUSED,
970 Elf_Internal_Rela *rel,
971 struct elf_link_hash_entry *h,
972 Elf_Internal_Sym *sym)
976 switch (ELF32_R_TYPE (rel->r_info))
978 case R_XTENSA_GNU_VTINHERIT:
979 case R_XTENSA_GNU_VTENTRY:
983 switch (h->root.type)
985 case bfd_link_hash_defined:
986 case bfd_link_hash_defweak:
987 return h->root.u.def.section;
989 case bfd_link_hash_common:
990 return h->root.u.c.p->section;
998 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
1004 /* Update the GOT & PLT entry reference counts
1005 for the section being removed. */
1008 elf_xtensa_gc_sweep_hook (bfd *abfd,
1009 struct bfd_link_info *info ATTRIBUTE_UNUSED,
1011 const Elf_Internal_Rela *relocs)
1013 Elf_Internal_Shdr *symtab_hdr;
1014 struct elf_link_hash_entry **sym_hashes;
1015 bfd_signed_vma *local_got_refcounts;
1016 const Elf_Internal_Rela *rel, *relend;
1018 if ((sec->flags & SEC_ALLOC) == 0)
1021 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1022 sym_hashes = elf_sym_hashes (abfd);
1023 local_got_refcounts = elf_local_got_refcounts (abfd);
1025 relend = relocs + sec->reloc_count;
1026 for (rel = relocs; rel < relend; rel++)
1028 unsigned long r_symndx;
1029 unsigned int r_type;
1030 struct elf_link_hash_entry *h = NULL;
1032 r_symndx = ELF32_R_SYM (rel->r_info);
1033 if (r_symndx >= symtab_hdr->sh_info)
1035 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1036 while (h->root.type == bfd_link_hash_indirect
1037 || h->root.type == bfd_link_hash_warning)
1038 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1041 r_type = ELF32_R_TYPE (rel->r_info);
1047 if (h->got.refcount > 0)
1054 if (h->plt.refcount > 0)
1059 if (local_got_refcounts[r_symndx] > 0)
1060 local_got_refcounts[r_symndx] -= 1;
1072 /* Create all the dynamic sections. */
1075 elf_xtensa_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
1077 flagword flags, noalloc_flags;
1080 /* First do all the standard stuff. */
1081 if (! _bfd_elf_create_dynamic_sections (dynobj, info))
1084 /* Create any extra PLT sections in case check_relocs has already
1085 been called on all the non-dynamic input files. */
1086 if (!add_extra_plt_sections (dynobj, plt_reloc_count))
1089 noalloc_flags = (SEC_HAS_CONTENTS | SEC_IN_MEMORY
1090 | SEC_LINKER_CREATED | SEC_READONLY);
1091 flags = noalloc_flags | SEC_ALLOC | SEC_LOAD;
1093 /* Mark the ".got.plt" section READONLY. */
1094 s = bfd_get_section_by_name (dynobj, ".got.plt");
1096 || ! bfd_set_section_flags (dynobj, s, flags))
1099 /* Create ".rela.got". */
1100 s = bfd_make_section_with_flags (dynobj, ".rela.got", flags);
1102 || ! bfd_set_section_alignment (dynobj, s, 2))
1105 /* Create ".got.loc" (literal tables for use by dynamic linker). */
1106 s = bfd_make_section_with_flags (dynobj, ".got.loc", flags);
1108 || ! bfd_set_section_alignment (dynobj, s, 2))
1111 /* Create ".xt.lit.plt" (literal table for ".got.plt*"). */
1112 s = bfd_make_section_with_flags (dynobj, ".xt.lit.plt",
1115 || ! bfd_set_section_alignment (dynobj, s, 2))
1123 add_extra_plt_sections (bfd *dynobj, int count)
1127 /* Iterate over all chunks except 0 which uses the standard ".plt" and
1128 ".got.plt" sections. */
1129 for (chunk = count / PLT_ENTRIES_PER_CHUNK; chunk > 0; chunk--)
1135 /* Stop when we find a section has already been created. */
1136 if (elf_xtensa_get_plt_section (dynobj, chunk))
1139 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1140 | SEC_LINKER_CREATED | SEC_READONLY);
1142 sname = (char *) bfd_malloc (10);
1143 sprintf (sname, ".plt.%u", chunk);
1144 s = bfd_make_section_with_flags (dynobj, sname,
1147 || ! bfd_set_section_alignment (dynobj, s, 2))
1150 sname = (char *) bfd_malloc (14);
1151 sprintf (sname, ".got.plt.%u", chunk);
1152 s = bfd_make_section_with_flags (dynobj, sname, flags);
1154 || ! bfd_set_section_alignment (dynobj, s, 2))
1162 /* Adjust a symbol defined by a dynamic object and referenced by a
1163 regular object. The current definition is in some section of the
1164 dynamic object, but we're not including those sections. We have to
1165 change the definition to something the rest of the link can
1169 elf_xtensa_adjust_dynamic_symbol (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1170 struct elf_link_hash_entry *h)
1172 /* If this is a weak symbol, and there is a real definition, the
1173 processor independent code will have arranged for us to see the
1174 real definition first, and we can just use the same value. */
1177 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1178 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1179 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1180 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1184 /* This is a reference to a symbol defined by a dynamic object. The
1185 reference must go through the GOT, so there's no need for COPY relocs,
1193 elf_xtensa_fix_refcounts (struct elf_link_hash_entry *h, void *arg)
1195 struct bfd_link_info *info = (struct bfd_link_info *) arg;
1197 if (h->root.type == bfd_link_hash_warning)
1198 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1200 if (! xtensa_elf_dynamic_symbol_p (h, info))
1201 elf_xtensa_make_sym_local (info, h);
1208 elf_xtensa_allocate_plt_size (struct elf_link_hash_entry *h, void *arg)
1210 asection *srelplt = (asection *) arg;
1212 if (h->root.type == bfd_link_hash_warning)
1213 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1215 if (h->plt.refcount > 0)
1216 srelplt->size += (h->plt.refcount * sizeof (Elf32_External_Rela));
1223 elf_xtensa_allocate_got_size (struct elf_link_hash_entry *h, void *arg)
1225 asection *srelgot = (asection *) arg;
1227 if (h->root.type == bfd_link_hash_warning)
1228 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1230 if (h->got.refcount > 0)
1231 srelgot->size += (h->got.refcount * sizeof (Elf32_External_Rela));
1238 elf_xtensa_allocate_local_got_size (struct bfd_link_info *info,
1243 for (i = info->input_bfds; i; i = i->link_next)
1245 bfd_signed_vma *local_got_refcounts;
1246 bfd_size_type j, cnt;
1247 Elf_Internal_Shdr *symtab_hdr;
1249 local_got_refcounts = elf_local_got_refcounts (i);
1250 if (!local_got_refcounts)
1253 symtab_hdr = &elf_tdata (i)->symtab_hdr;
1254 cnt = symtab_hdr->sh_info;
1256 for (j = 0; j < cnt; ++j)
1258 if (local_got_refcounts[j] > 0)
1259 srelgot->size += (local_got_refcounts[j]
1260 * sizeof (Elf32_External_Rela));
1266 /* Set the sizes of the dynamic sections. */
1269 elf_xtensa_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
1270 struct bfd_link_info *info)
1273 asection *s, *srelplt, *splt, *sgotplt, *srelgot, *spltlittbl, *sgotloc;
1274 bfd_boolean relplt, relgot;
1275 int plt_entries, plt_chunks, chunk;
1281 dynobj = elf_hash_table (info)->dynobj;
1285 if (elf_hash_table (info)->dynamic_sections_created)
1287 /* Set the contents of the .interp section to the interpreter. */
1288 if (info->executable)
1290 s = bfd_get_section_by_name (dynobj, ".interp");
1293 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
1294 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1297 /* Allocate room for one word in ".got". */
1298 s = bfd_get_section_by_name (dynobj, ".got");
1303 /* Adjust refcounts for symbols that we now know are not "dynamic". */
1304 elf_link_hash_traverse (elf_hash_table (info),
1305 elf_xtensa_fix_refcounts,
1308 /* Allocate space in ".rela.got" for literals that reference
1310 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
1311 if (srelgot == NULL)
1313 elf_link_hash_traverse (elf_hash_table (info),
1314 elf_xtensa_allocate_got_size,
1317 /* If we are generating a shared object, we also need space in
1318 ".rela.got" for R_XTENSA_RELATIVE relocs for literals that
1319 reference local symbols. */
1321 elf_xtensa_allocate_local_got_size (info, srelgot);
1323 /* Allocate space in ".rela.plt" for literals that have PLT entries. */
1324 srelplt = bfd_get_section_by_name (dynobj, ".rela.plt");
1325 if (srelplt == NULL)
1327 elf_link_hash_traverse (elf_hash_table (info),
1328 elf_xtensa_allocate_plt_size,
1331 /* Allocate space in ".plt" to match the size of ".rela.plt". For
1332 each PLT entry, we need the PLT code plus a 4-byte literal.
1333 For each chunk of ".plt", we also need two more 4-byte
1334 literals, two corresponding entries in ".rela.got", and an
1335 8-byte entry in ".xt.lit.plt". */
1336 spltlittbl = bfd_get_section_by_name (dynobj, ".xt.lit.plt");
1337 if (spltlittbl == NULL)
1340 plt_entries = srelplt->size / sizeof (Elf32_External_Rela);
1342 (plt_entries + PLT_ENTRIES_PER_CHUNK - 1) / PLT_ENTRIES_PER_CHUNK;
1344 /* Iterate over all the PLT chunks, including any extra sections
1345 created earlier because the initial count of PLT relocations
1346 was an overestimate. */
1348 (splt = elf_xtensa_get_plt_section (dynobj, chunk)) != NULL;
1353 sgotplt = elf_xtensa_get_gotplt_section (dynobj, chunk);
1354 if (sgotplt == NULL)
1357 if (chunk < plt_chunks - 1)
1358 chunk_entries = PLT_ENTRIES_PER_CHUNK;
1359 else if (chunk == plt_chunks - 1)
1360 chunk_entries = plt_entries - (chunk * PLT_ENTRIES_PER_CHUNK);
1364 if (chunk_entries != 0)
1366 sgotplt->size = 4 * (chunk_entries + 2);
1367 splt->size = PLT_ENTRY_SIZE * chunk_entries;
1368 srelgot->size += 2 * sizeof (Elf32_External_Rela);
1369 spltlittbl->size += 8;
1378 /* Allocate space in ".got.loc" to match the total size of all the
1380 sgotloc = bfd_get_section_by_name (dynobj, ".got.loc");
1381 if (sgotloc == NULL)
1383 sgotloc->size = spltlittbl->size;
1384 for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link_next)
1386 if (abfd->flags & DYNAMIC)
1388 for (s = abfd->sections; s != NULL; s = s->next)
1390 if (! elf_discarded_section (s)
1391 && xtensa_is_littable_section (s)
1393 sgotloc->size += s->size;
1398 /* Allocate memory for dynamic sections. */
1401 for (s = dynobj->sections; s != NULL; s = s->next)
1405 if ((s->flags & SEC_LINKER_CREATED) == 0)
1408 /* It's OK to base decisions on the section name, because none
1409 of the dynobj section names depend upon the input files. */
1410 name = bfd_get_section_name (dynobj, s);
1412 if (strncmp (name, ".rela", 5) == 0)
1416 if (strcmp (name, ".rela.plt") == 0)
1418 else if (strcmp (name, ".rela.got") == 0)
1421 /* We use the reloc_count field as a counter if we need
1422 to copy relocs into the output file. */
1426 else if (strncmp (name, ".plt.", 5) != 0
1427 && strncmp (name, ".got.plt.", 9) != 0
1428 && strcmp (name, ".got") != 0
1429 && strcmp (name, ".plt") != 0
1430 && strcmp (name, ".got.plt") != 0
1431 && strcmp (name, ".xt.lit.plt") != 0
1432 && strcmp (name, ".got.loc") != 0)
1434 /* It's not one of our sections, so don't allocate space. */
1440 /* If we don't need this section, strip it from the output
1441 file. We must create the ".plt*" and ".got.plt*"
1442 sections in create_dynamic_sections and/or check_relocs
1443 based on a conservative estimate of the PLT relocation
1444 count, because the sections must be created before the
1445 linker maps input sections to output sections. The
1446 linker does that before size_dynamic_sections, where we
1447 compute the exact size of the PLT, so there may be more
1448 of these sections than are actually needed. */
1449 s->flags |= SEC_EXCLUDE;
1451 else if ((s->flags & SEC_HAS_CONTENTS) != 0)
1453 /* Allocate memory for the section contents. */
1454 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
1455 if (s->contents == NULL)
1460 if (elf_hash_table (info)->dynamic_sections_created)
1462 /* Add the special XTENSA_RTLD relocations now. The offsets won't be
1463 known until finish_dynamic_sections, but we need to get the relocs
1464 in place before they are sorted. */
1465 if (srelgot == NULL)
1467 for (chunk = 0; chunk < plt_chunks; chunk++)
1469 Elf_Internal_Rela irela;
1473 irela.r_info = ELF32_R_INFO (0, R_XTENSA_RTLD);
1476 loc = (srelgot->contents
1477 + srelgot->reloc_count * sizeof (Elf32_External_Rela));
1478 bfd_elf32_swap_reloca_out (output_bfd, &irela, loc);
1479 bfd_elf32_swap_reloca_out (output_bfd, &irela,
1480 loc + sizeof (Elf32_External_Rela));
1481 srelgot->reloc_count += 2;
1484 /* Add some entries to the .dynamic section. We fill in the
1485 values later, in elf_xtensa_finish_dynamic_sections, but we
1486 must add the entries now so that we get the correct size for
1487 the .dynamic section. The DT_DEBUG entry is filled in by the
1488 dynamic linker and used by the debugger. */
1489 #define add_dynamic_entry(TAG, VAL) \
1490 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
1494 if (!add_dynamic_entry (DT_DEBUG, 0))
1500 if (!add_dynamic_entry (DT_PLTGOT, 0)
1501 || !add_dynamic_entry (DT_PLTRELSZ, 0)
1502 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
1503 || !add_dynamic_entry (DT_JMPREL, 0))
1509 if (!add_dynamic_entry (DT_RELA, 0)
1510 || !add_dynamic_entry (DT_RELASZ, 0)
1511 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
1515 if (!add_dynamic_entry (DT_XTENSA_GOT_LOC_OFF, 0)
1516 || !add_dynamic_entry (DT_XTENSA_GOT_LOC_SZ, 0))
1519 #undef add_dynamic_entry
1525 /* Perform the specified relocation. The instruction at (contents + address)
1526 is modified to set one operand to represent the value in "relocation". The
1527 operand position is determined by the relocation type recorded in the
1530 #define CALL_SEGMENT_BITS (30)
1531 #define CALL_SEGMENT_SIZE (1 << CALL_SEGMENT_BITS)
1533 static bfd_reloc_status_type
1534 elf_xtensa_do_reloc (reloc_howto_type *howto,
1536 asection *input_section,
1540 bfd_boolean is_weak_undef,
1541 char **error_message)
1544 xtensa_opcode opcode;
1545 xtensa_isa isa = xtensa_default_isa;
1546 static xtensa_insnbuf ibuff = NULL;
1547 static xtensa_insnbuf sbuff = NULL;
1548 bfd_vma self_address = 0;
1549 bfd_size_type input_size;
1555 ibuff = xtensa_insnbuf_alloc (isa);
1556 sbuff = xtensa_insnbuf_alloc (isa);
1559 input_size = bfd_get_section_limit (abfd, input_section);
1561 switch (howto->type)
1564 case R_XTENSA_DIFF8:
1565 case R_XTENSA_DIFF16:
1566 case R_XTENSA_DIFF32:
1567 return bfd_reloc_ok;
1569 case R_XTENSA_ASM_EXPAND:
1572 /* Check for windowed CALL across a 1GB boundary. */
1573 xtensa_opcode opcode =
1574 get_expanded_call_opcode (contents + address,
1575 input_size - address, 0);
1576 if (is_windowed_call_opcode (opcode))
1578 self_address = (input_section->output_section->vma
1579 + input_section->output_offset
1581 if ((self_address >> CALL_SEGMENT_BITS)
1582 != (relocation >> CALL_SEGMENT_BITS))
1584 *error_message = "windowed longcall crosses 1GB boundary; "
1586 return bfd_reloc_dangerous;
1590 return bfd_reloc_ok;
1592 case R_XTENSA_ASM_SIMPLIFY:
1594 /* Convert the L32R/CALLX to CALL. */
1595 bfd_reloc_status_type retval =
1596 elf_xtensa_do_asm_simplify (contents, address, input_size,
1598 if (retval != bfd_reloc_ok)
1599 return bfd_reloc_dangerous;
1601 /* The CALL needs to be relocated. Continue below for that part. */
1603 howto = &elf_howto_table[(unsigned) R_XTENSA_SLOT0_OP ];
1611 x = bfd_get_32 (abfd, contents + address);
1613 bfd_put_32 (abfd, x, contents + address);
1615 return bfd_reloc_ok;
1618 /* Only instruction slot-specific relocations handled below.... */
1619 slot = get_relocation_slot (howto->type);
1620 if (slot == XTENSA_UNDEFINED)
1622 *error_message = "unexpected relocation";
1623 return bfd_reloc_dangerous;
1626 /* Read the instruction into a buffer and decode the opcode. */
1627 xtensa_insnbuf_from_chars (isa, ibuff, contents + address,
1628 input_size - address);
1629 fmt = xtensa_format_decode (isa, ibuff);
1630 if (fmt == XTENSA_UNDEFINED)
1632 *error_message = "cannot decode instruction format";
1633 return bfd_reloc_dangerous;
1636 xtensa_format_get_slot (isa, fmt, slot, ibuff, sbuff);
1638 opcode = xtensa_opcode_decode (isa, fmt, slot, sbuff);
1639 if (opcode == XTENSA_UNDEFINED)
1641 *error_message = "cannot decode instruction opcode";
1642 return bfd_reloc_dangerous;
1645 /* Check for opcode-specific "alternate" relocations. */
1646 if (is_alt_relocation (howto->type))
1648 if (opcode == get_l32r_opcode ())
1650 /* Handle the special-case of non-PC-relative L32R instructions. */
1651 bfd *output_bfd = input_section->output_section->owner;
1652 asection *lit4_sec = bfd_get_section_by_name (output_bfd, ".lit4");
1655 *error_message = "relocation references missing .lit4 section";
1656 return bfd_reloc_dangerous;
1658 self_address = ((lit4_sec->vma & ~0xfff)
1659 + 0x40000 - 3); /* -3 to compensate for do_reloc */
1660 newval = relocation;
1663 else if (opcode == get_const16_opcode ())
1665 /* ALT used for high 16 bits. */
1666 newval = relocation >> 16;
1671 /* No other "alternate" relocations currently defined. */
1672 *error_message = "unexpected relocation";
1673 return bfd_reloc_dangerous;
1676 else /* Not an "alternate" relocation.... */
1678 if (opcode == get_const16_opcode ())
1680 newval = relocation & 0xffff;
1685 /* ...normal PC-relative relocation.... */
1687 /* Determine which operand is being relocated. */
1688 opnd = get_relocation_opnd (opcode, howto->type);
1689 if (opnd == XTENSA_UNDEFINED)
1691 *error_message = "unexpected relocation";
1692 return bfd_reloc_dangerous;
1695 if (!howto->pc_relative)
1697 *error_message = "expected PC-relative relocation";
1698 return bfd_reloc_dangerous;
1701 /* Calculate the PC address for this instruction. */
1702 self_address = (input_section->output_section->vma
1703 + input_section->output_offset
1706 newval = relocation;
1710 /* Apply the relocation. */
1711 if (xtensa_operand_do_reloc (isa, opcode, opnd, &newval, self_address)
1712 || xtensa_operand_encode (isa, opcode, opnd, &newval)
1713 || xtensa_operand_set_field (isa, opcode, opnd, fmt, slot,
1716 const char *opname = xtensa_opcode_name (isa, opcode);
1719 msg = "cannot encode";
1720 if (is_direct_call_opcode (opcode))
1722 if ((relocation & 0x3) != 0)
1723 msg = "misaligned call target";
1725 msg = "call target out of range";
1727 else if (opcode == get_l32r_opcode ())
1729 if ((relocation & 0x3) != 0)
1730 msg = "misaligned literal target";
1731 else if (is_alt_relocation (howto->type))
1732 msg = "literal target out of range (too many literals)";
1733 else if (self_address > relocation)
1734 msg = "literal target out of range (try using text-section-literals)";
1736 msg = "literal placed after use";
1739 *error_message = vsprint_msg (opname, ": %s", strlen (msg) + 2, msg);
1740 return bfd_reloc_dangerous;
1743 /* Check for calls across 1GB boundaries. */
1744 if (is_direct_call_opcode (opcode)
1745 && is_windowed_call_opcode (opcode))
1747 if ((self_address >> CALL_SEGMENT_BITS)
1748 != (relocation >> CALL_SEGMENT_BITS))
1751 "windowed call crosses 1GB boundary; return may fail";
1752 return bfd_reloc_dangerous;
1756 /* Write the modified instruction back out of the buffer. */
1757 xtensa_format_set_slot (isa, fmt, slot, ibuff, sbuff);
1758 xtensa_insnbuf_to_chars (isa, ibuff, contents + address,
1759 input_size - address);
1760 return bfd_reloc_ok;
1765 vsprint_msg (const char *origmsg, const char *fmt, int arglen, ...)
1767 /* To reduce the size of the memory leak,
1768 we only use a single message buffer. */
1769 static bfd_size_type alloc_size = 0;
1770 static char *message = NULL;
1771 bfd_size_type orig_len, len = 0;
1772 bfd_boolean is_append;
1774 VA_OPEN (ap, arglen);
1775 VA_FIXEDARG (ap, const char *, origmsg);
1777 is_append = (origmsg == message);
1779 orig_len = strlen (origmsg);
1780 len = orig_len + strlen (fmt) + arglen + 20;
1781 if (len > alloc_size)
1783 message = (char *) bfd_realloc (message, len);
1787 memcpy (message, origmsg, orig_len);
1788 vsprintf (message + orig_len, fmt, ap);
1794 /* This function is registered as the "special_function" in the
1795 Xtensa howto for handling simplify operations.
1796 bfd_perform_relocation / bfd_install_relocation use it to
1797 perform (install) the specified relocation. Since this replaces the code
1798 in bfd_perform_relocation, it is basically an Xtensa-specific,
1799 stripped-down version of bfd_perform_relocation. */
1801 static bfd_reloc_status_type
1802 bfd_elf_xtensa_reloc (bfd *abfd,
1803 arelent *reloc_entry,
1806 asection *input_section,
1808 char **error_message)
1811 bfd_reloc_status_type flag;
1812 bfd_size_type octets = reloc_entry->address * bfd_octets_per_byte (abfd);
1813 bfd_vma output_base = 0;
1814 reloc_howto_type *howto = reloc_entry->howto;
1815 asection *reloc_target_output_section;
1816 bfd_boolean is_weak_undef;
1818 if (!xtensa_default_isa)
1819 xtensa_default_isa = xtensa_isa_init (0, 0);
1821 /* ELF relocs are against symbols. If we are producing relocatable
1822 output, and the reloc is against an external symbol, the resulting
1823 reloc will also be against the same symbol. In such a case, we
1824 don't want to change anything about the way the reloc is handled,
1825 since it will all be done at final link time. This test is similar
1826 to what bfd_elf_generic_reloc does except that it lets relocs with
1827 howto->partial_inplace go through even if the addend is non-zero.
1828 (The real problem is that partial_inplace is set for XTENSA_32
1829 relocs to begin with, but that's a long story and there's little we
1830 can do about it now....) */
1832 if (output_bfd && (symbol->flags & BSF_SECTION_SYM) == 0)
1834 reloc_entry->address += input_section->output_offset;
1835 return bfd_reloc_ok;
1838 /* Is the address of the relocation really within the section? */
1839 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section))
1840 return bfd_reloc_outofrange;
1842 /* Work out which section the relocation is targeted at and the
1843 initial relocation command value. */
1845 /* Get symbol value. (Common symbols are special.) */
1846 if (bfd_is_com_section (symbol->section))
1849 relocation = symbol->value;
1851 reloc_target_output_section = symbol->section->output_section;
1853 /* Convert input-section-relative symbol value to absolute. */
1854 if ((output_bfd && !howto->partial_inplace)
1855 || reloc_target_output_section == NULL)
1858 output_base = reloc_target_output_section->vma;
1860 relocation += output_base + symbol->section->output_offset;
1862 /* Add in supplied addend. */
1863 relocation += reloc_entry->addend;
1865 /* Here the variable relocation holds the final address of the
1866 symbol we are relocating against, plus any addend. */
1869 if (!howto->partial_inplace)
1871 /* This is a partial relocation, and we want to apply the relocation
1872 to the reloc entry rather than the raw data. Everything except
1873 relocations against section symbols has already been handled
1876 BFD_ASSERT (symbol->flags & BSF_SECTION_SYM);
1877 reloc_entry->addend = relocation;
1878 reloc_entry->address += input_section->output_offset;
1879 return bfd_reloc_ok;
1883 reloc_entry->address += input_section->output_offset;
1884 reloc_entry->addend = 0;
1888 is_weak_undef = (bfd_is_und_section (symbol->section)
1889 && (symbol->flags & BSF_WEAK) != 0);
1890 flag = elf_xtensa_do_reloc (howto, abfd, input_section, relocation,
1891 (bfd_byte *) data, (bfd_vma) octets,
1892 is_weak_undef, error_message);
1894 if (flag == bfd_reloc_dangerous)
1896 /* Add the symbol name to the error message. */
1897 if (! *error_message)
1898 *error_message = "";
1899 *error_message = vsprint_msg (*error_message, ": (%s + 0x%lx)",
1900 strlen (symbol->name) + 17,
1902 (unsigned long) reloc_entry->addend);
1909 /* Set up an entry in the procedure linkage table. */
1912 elf_xtensa_create_plt_entry (bfd *dynobj,
1914 unsigned reloc_index)
1916 asection *splt, *sgotplt;
1917 bfd_vma plt_base, got_base;
1918 bfd_vma code_offset, lit_offset;
1921 chunk = reloc_index / PLT_ENTRIES_PER_CHUNK;
1922 splt = elf_xtensa_get_plt_section (dynobj, chunk);
1923 sgotplt = elf_xtensa_get_gotplt_section (dynobj, chunk);
1924 BFD_ASSERT (splt != NULL && sgotplt != NULL);
1926 plt_base = splt->output_section->vma + splt->output_offset;
1927 got_base = sgotplt->output_section->vma + sgotplt->output_offset;
1929 lit_offset = 8 + (reloc_index % PLT_ENTRIES_PER_CHUNK) * 4;
1930 code_offset = (reloc_index % PLT_ENTRIES_PER_CHUNK) * PLT_ENTRY_SIZE;
1932 /* Fill in the literal entry. This is the offset of the dynamic
1933 relocation entry. */
1934 bfd_put_32 (output_bfd, reloc_index * sizeof (Elf32_External_Rela),
1935 sgotplt->contents + lit_offset);
1937 /* Fill in the entry in the procedure linkage table. */
1938 memcpy (splt->contents + code_offset,
1939 (bfd_big_endian (output_bfd)
1940 ? elf_xtensa_be_plt_entry
1941 : elf_xtensa_le_plt_entry),
1943 bfd_put_16 (output_bfd, l32r_offset (got_base + 0,
1944 plt_base + code_offset + 3),
1945 splt->contents + code_offset + 4);
1946 bfd_put_16 (output_bfd, l32r_offset (got_base + 4,
1947 plt_base + code_offset + 6),
1948 splt->contents + code_offset + 7);
1949 bfd_put_16 (output_bfd, l32r_offset (got_base + lit_offset,
1950 plt_base + code_offset + 9),
1951 splt->contents + code_offset + 10);
1953 return plt_base + code_offset;
1957 /* Relocate an Xtensa ELF section. This is invoked by the linker for
1958 both relocatable and final links. */
1961 elf_xtensa_relocate_section (bfd *output_bfd,
1962 struct bfd_link_info *info,
1964 asection *input_section,
1966 Elf_Internal_Rela *relocs,
1967 Elf_Internal_Sym *local_syms,
1968 asection **local_sections)
1970 Elf_Internal_Shdr *symtab_hdr;
1971 Elf_Internal_Rela *rel;
1972 Elf_Internal_Rela *relend;
1973 struct elf_link_hash_entry **sym_hashes;
1974 asection *srelgot, *srelplt;
1976 property_table_entry *lit_table = 0;
1978 char *error_message = NULL;
1979 bfd_size_type input_size;
1981 if (!xtensa_default_isa)
1982 xtensa_default_isa = xtensa_isa_init (0, 0);
1984 dynobj = elf_hash_table (info)->dynobj;
1985 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1986 sym_hashes = elf_sym_hashes (input_bfd);
1992 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");;
1993 srelplt = bfd_get_section_by_name (dynobj, ".rela.plt");
1996 if (elf_hash_table (info)->dynamic_sections_created)
1998 ltblsize = xtensa_read_table_entries (input_bfd, input_section,
1999 &lit_table, XTENSA_LIT_SEC_NAME,
2005 input_size = bfd_get_section_limit (input_bfd, input_section);
2008 relend = relocs + input_section->reloc_count;
2009 for (; rel < relend; rel++)
2012 reloc_howto_type *howto;
2013 unsigned long r_symndx;
2014 struct elf_link_hash_entry *h;
2015 Elf_Internal_Sym *sym;
2018 bfd_reloc_status_type r;
2019 bfd_boolean is_weak_undef;
2020 bfd_boolean unresolved_reloc;
2023 r_type = ELF32_R_TYPE (rel->r_info);
2024 if (r_type == (int) R_XTENSA_GNU_VTINHERIT
2025 || r_type == (int) R_XTENSA_GNU_VTENTRY)
2028 if (r_type < 0 || r_type >= (int) R_XTENSA_max)
2030 bfd_set_error (bfd_error_bad_value);
2033 howto = &elf_howto_table[r_type];
2035 r_symndx = ELF32_R_SYM (rel->r_info);
2037 if (info->relocatable)
2039 /* This is a relocatable link.
2040 1) If the reloc is against a section symbol, adjust
2041 according to the output section.
2042 2) If there is a new target for this relocation,
2043 the new target will be in the same output section.
2044 We adjust the relocation by the output section
2047 if (relaxing_section)
2049 /* Check if this references a section in another input file. */
2050 if (!do_fix_for_relocatable_link (rel, input_bfd, input_section,
2053 r_type = ELF32_R_TYPE (rel->r_info);
2056 if (r_type == R_XTENSA_ASM_SIMPLIFY)
2058 char *error_message = NULL;
2059 /* Convert ASM_SIMPLIFY into the simpler relocation
2060 so that they never escape a relaxing link. */
2061 r = contract_asm_expansion (contents, input_size, rel,
2063 if (r != bfd_reloc_ok)
2065 if (!((*info->callbacks->reloc_dangerous)
2066 (info, error_message, input_bfd, input_section,
2070 r_type = ELF32_R_TYPE (rel->r_info);
2073 /* This is a relocatable link, so we don't have to change
2074 anything unless the reloc is against a section symbol,
2075 in which case we have to adjust according to where the
2076 section symbol winds up in the output section. */
2077 if (r_symndx < symtab_hdr->sh_info)
2079 sym = local_syms + r_symndx;
2080 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
2082 sec = local_sections[r_symndx];
2083 rel->r_addend += sec->output_offset + sym->st_value;
2087 /* If there is an addend with a partial_inplace howto,
2088 then move the addend to the contents. This is a hack
2089 to work around problems with DWARF in relocatable links
2090 with some previous version of BFD. Now we can't easily get
2091 rid of the hack without breaking backward compatibility.... */
2094 howto = &elf_howto_table[r_type];
2095 if (howto->partial_inplace)
2097 r = elf_xtensa_do_reloc (howto, input_bfd, input_section,
2098 rel->r_addend, contents,
2099 rel->r_offset, FALSE,
2101 if (r != bfd_reloc_ok)
2103 if (!((*info->callbacks->reloc_dangerous)
2104 (info, error_message, input_bfd, input_section,
2112 /* Done with work for relocatable link; continue with next reloc. */
2116 /* This is a final link. */
2121 is_weak_undef = FALSE;
2122 unresolved_reloc = FALSE;
2125 if (howto->partial_inplace)
2127 /* Because R_XTENSA_32 was made partial_inplace to fix some
2128 problems with DWARF info in partial links, there may be
2129 an addend stored in the contents. Take it out of there
2130 and move it back into the addend field of the reloc. */
2131 rel->r_addend += bfd_get_32 (input_bfd, contents + rel->r_offset);
2132 bfd_put_32 (input_bfd, 0, contents + rel->r_offset);
2135 if (r_symndx < symtab_hdr->sh_info)
2137 sym = local_syms + r_symndx;
2138 sec = local_sections[r_symndx];
2139 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
2143 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2144 r_symndx, symtab_hdr, sym_hashes,
2146 unresolved_reloc, warned);
2149 && !unresolved_reloc
2150 && h->root.type == bfd_link_hash_undefweak)
2151 is_weak_undef = TRUE;
2154 if (relaxing_section)
2156 /* Check if this references a section in another input file. */
2157 do_fix_for_final_link (rel, input_bfd, input_section, contents,
2160 /* Update some already cached values. */
2161 r_type = ELF32_R_TYPE (rel->r_info);
2162 howto = &elf_howto_table[r_type];
2165 /* Sanity check the address. */
2166 if (rel->r_offset >= input_size
2167 && ELF32_R_TYPE (rel->r_info) != R_XTENSA_NONE)
2169 (*_bfd_error_handler)
2170 (_("%B(%A+0x%lx): relocation offset out of range (size=0x%x)"),
2171 input_bfd, input_section, rel->r_offset, input_size);
2172 bfd_set_error (bfd_error_bad_value);
2176 /* Generate dynamic relocations. */
2177 if (elf_hash_table (info)->dynamic_sections_created)
2179 bfd_boolean dynamic_symbol = xtensa_elf_dynamic_symbol_p (h, info);
2181 if (dynamic_symbol && is_operand_relocation (r_type))
2183 /* This is an error. The symbol's real value won't be known
2184 until runtime and it's likely to be out of range anyway. */
2185 const char *name = h->root.root.string;
2186 error_message = vsprint_msg ("invalid relocation for dynamic "
2188 strlen (name) + 2, name);
2189 if (!((*info->callbacks->reloc_dangerous)
2190 (info, error_message, input_bfd, input_section,
2194 else if ((r_type == R_XTENSA_32 || r_type == R_XTENSA_PLT)
2195 && (input_section->flags & SEC_ALLOC) != 0
2196 && (dynamic_symbol || info->shared))
2198 Elf_Internal_Rela outrel;
2202 if (dynamic_symbol && r_type == R_XTENSA_PLT)
2207 BFD_ASSERT (srel != NULL);
2210 _bfd_elf_section_offset (output_bfd, info,
2211 input_section, rel->r_offset);
2213 if ((outrel.r_offset | 1) == (bfd_vma) -1)
2214 memset (&outrel, 0, sizeof outrel);
2217 outrel.r_offset += (input_section->output_section->vma
2218 + input_section->output_offset);
2220 /* Complain if the relocation is in a read-only section
2221 and not in a literal pool. */
2222 if ((input_section->flags & SEC_READONLY) != 0
2223 && !elf_xtensa_in_literal_pool (lit_table, ltblsize,
2227 _("dynamic relocation in read-only section");
2228 if (!((*info->callbacks->reloc_dangerous)
2229 (info, error_message, input_bfd, input_section,
2236 outrel.r_addend = rel->r_addend;
2239 if (r_type == R_XTENSA_32)
2242 ELF32_R_INFO (h->dynindx, R_XTENSA_GLOB_DAT);
2245 else /* r_type == R_XTENSA_PLT */
2248 ELF32_R_INFO (h->dynindx, R_XTENSA_JMP_SLOT);
2250 /* Create the PLT entry and set the initial
2251 contents of the literal entry to the address of
2254 elf_xtensa_create_plt_entry (dynobj, output_bfd,
2257 unresolved_reloc = FALSE;
2261 /* Generate a RELATIVE relocation. */
2262 outrel.r_info = ELF32_R_INFO (0, R_XTENSA_RELATIVE);
2263 outrel.r_addend = 0;
2267 loc = (srel->contents
2268 + srel->reloc_count++ * sizeof (Elf32_External_Rela));
2269 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2270 BFD_ASSERT (sizeof (Elf32_External_Rela) * srel->reloc_count
2275 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
2276 because such sections are not SEC_ALLOC and thus ld.so will
2277 not process them. */
2278 if (unresolved_reloc
2279 && !((input_section->flags & SEC_DEBUGGING) != 0
2281 (*_bfd_error_handler)
2282 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
2285 (long) rel->r_offset,
2287 h->root.root.string);
2289 /* There's no point in calling bfd_perform_relocation here.
2290 Just go directly to our "special function". */
2291 r = elf_xtensa_do_reloc (howto, input_bfd, input_section,
2292 relocation + rel->r_addend,
2293 contents, rel->r_offset, is_weak_undef,
2296 if (r != bfd_reloc_ok && !warned)
2300 BFD_ASSERT (r == bfd_reloc_dangerous || r == bfd_reloc_other);
2301 BFD_ASSERT (error_message != NULL);
2304 name = h->root.root.string;
2307 name = bfd_elf_string_from_elf_section
2308 (input_bfd, symtab_hdr->sh_link, sym->st_name);
2309 if (name && *name == '\0')
2310 name = bfd_section_name (input_bfd, sec);
2314 if (rel->r_addend == 0)
2315 error_message = vsprint_msg (error_message, ": %s",
2316 strlen (name) + 2, name);
2318 error_message = vsprint_msg (error_message, ": (%s+0x%x)",
2320 name, (int)rel->r_addend);
2323 if (!((*info->callbacks->reloc_dangerous)
2324 (info, error_message, input_bfd, input_section,
2333 input_section->reloc_done = TRUE;
2339 /* Finish up dynamic symbol handling. There's not much to do here since
2340 the PLT and GOT entries are all set up by relocate_section. */
2343 elf_xtensa_finish_dynamic_symbol (bfd *output_bfd ATTRIBUTE_UNUSED,
2344 struct bfd_link_info *info ATTRIBUTE_UNUSED,
2345 struct elf_link_hash_entry *h,
2346 Elf_Internal_Sym *sym)
2351 /* Mark the symbol as undefined, rather than as defined in
2352 the .plt section. Leave the value alone. */
2353 sym->st_shndx = SHN_UNDEF;
2356 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
2357 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
2358 || h == elf_hash_table (info)->hgot)
2359 sym->st_shndx = SHN_ABS;
2365 /* Combine adjacent literal table entries in the output. Adjacent
2366 entries within each input section may have been removed during
2367 relaxation, but we repeat the process here, even though it's too late
2368 to shrink the output section, because it's important to minimize the
2369 number of literal table entries to reduce the start-up work for the
2370 runtime linker. Returns the number of remaining table entries or -1
2374 elf_xtensa_combine_prop_entries (bfd *output_bfd,
2379 property_table_entry *table;
2380 bfd_size_type section_size, sgotloc_size;
2384 section_size = sxtlit->size;
2385 BFD_ASSERT (section_size % 8 == 0);
2386 num = section_size / 8;
2388 sgotloc_size = sgotloc->size;
2389 if (sgotloc_size != section_size)
2391 (*_bfd_error_handler)
2392 (_("internal inconsistency in size of .got.loc section"));
2396 table = bfd_malloc (num * sizeof (property_table_entry));
2400 /* The ".xt.lit.plt" section has the SEC_IN_MEMORY flag set and this
2401 propagates to the output section, where it doesn't really apply and
2402 where it breaks the following call to bfd_malloc_and_get_section. */
2403 sxtlit->flags &= ~SEC_IN_MEMORY;
2405 if (!bfd_malloc_and_get_section (output_bfd, sxtlit, &contents))
2413 /* There should never be any relocations left at this point, so this
2414 is quite a bit easier than what is done during relaxation. */
2416 /* Copy the raw contents into a property table array and sort it. */
2418 for (n = 0; n < num; n++)
2420 table[n].address = bfd_get_32 (output_bfd, &contents[offset]);
2421 table[n].size = bfd_get_32 (output_bfd, &contents[offset + 4]);
2424 qsort (table, num, sizeof (property_table_entry), property_table_compare);
2426 for (n = 0; n < num; n++)
2428 bfd_boolean remove = FALSE;
2430 if (table[n].size == 0)
2433 (table[n-1].address + table[n-1].size == table[n].address))
2435 table[n-1].size += table[n].size;
2441 for (m = n; m < num - 1; m++)
2443 table[m].address = table[m+1].address;
2444 table[m].size = table[m+1].size;
2452 /* Copy the data back to the raw contents. */
2454 for (n = 0; n < num; n++)
2456 bfd_put_32 (output_bfd, table[n].address, &contents[offset]);
2457 bfd_put_32 (output_bfd, table[n].size, &contents[offset + 4]);
2461 /* Clear the removed bytes. */
2462 if ((bfd_size_type) (num * 8) < section_size)
2463 memset (&contents[num * 8], 0, section_size - num * 8);
2465 if (! bfd_set_section_contents (output_bfd, sxtlit, contents, 0,
2469 /* Copy the contents to ".got.loc". */
2470 memcpy (sgotloc->contents, contents, section_size);
2478 /* Finish up the dynamic sections. */
2481 elf_xtensa_finish_dynamic_sections (bfd *output_bfd,
2482 struct bfd_link_info *info)
2485 asection *sdyn, *srelplt, *sgot, *sxtlit, *sgotloc;
2486 Elf32_External_Dyn *dyncon, *dynconend;
2487 int num_xtlit_entries;
2489 if (! elf_hash_table (info)->dynamic_sections_created)
2492 dynobj = elf_hash_table (info)->dynobj;
2493 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
2494 BFD_ASSERT (sdyn != NULL);
2496 /* Set the first entry in the global offset table to the address of
2497 the dynamic section. */
2498 sgot = bfd_get_section_by_name (dynobj, ".got");
2501 BFD_ASSERT (sgot->size == 4);
2503 bfd_put_32 (output_bfd, 0, sgot->contents);
2505 bfd_put_32 (output_bfd,
2506 sdyn->output_section->vma + sdyn->output_offset,
2510 srelplt = bfd_get_section_by_name (dynobj, ".rela.plt");
2511 if (srelplt && srelplt->size != 0)
2513 asection *sgotplt, *srelgot, *spltlittbl;
2514 int chunk, plt_chunks, plt_entries;
2515 Elf_Internal_Rela irela;
2517 unsigned rtld_reloc;
2519 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");;
2520 BFD_ASSERT (srelgot != NULL);
2522 spltlittbl = bfd_get_section_by_name (dynobj, ".xt.lit.plt");
2523 BFD_ASSERT (spltlittbl != NULL);
2525 /* Find the first XTENSA_RTLD relocation. Presumably the rest
2526 of them follow immediately after.... */
2527 for (rtld_reloc = 0; rtld_reloc < srelgot->reloc_count; rtld_reloc++)
2529 loc = srelgot->contents + rtld_reloc * sizeof (Elf32_External_Rela);
2530 bfd_elf32_swap_reloca_in (output_bfd, loc, &irela);
2531 if (ELF32_R_TYPE (irela.r_info) == R_XTENSA_RTLD)
2534 BFD_ASSERT (rtld_reloc < srelgot->reloc_count);
2536 plt_entries = srelplt->size / sizeof (Elf32_External_Rela);
2538 (plt_entries + PLT_ENTRIES_PER_CHUNK - 1) / PLT_ENTRIES_PER_CHUNK;
2540 for (chunk = 0; chunk < plt_chunks; chunk++)
2542 int chunk_entries = 0;
2544 sgotplt = elf_xtensa_get_gotplt_section (dynobj, chunk);
2545 BFD_ASSERT (sgotplt != NULL);
2547 /* Emit special RTLD relocations for the first two entries in
2548 each chunk of the .got.plt section. */
2550 loc = srelgot->contents + rtld_reloc * sizeof (Elf32_External_Rela);
2551 bfd_elf32_swap_reloca_in (output_bfd, loc, &irela);
2552 BFD_ASSERT (ELF32_R_TYPE (irela.r_info) == R_XTENSA_RTLD);
2553 irela.r_offset = (sgotplt->output_section->vma
2554 + sgotplt->output_offset);
2555 irela.r_addend = 1; /* tell rtld to set value to resolver function */
2556 bfd_elf32_swap_reloca_out (output_bfd, &irela, loc);
2558 BFD_ASSERT (rtld_reloc <= srelgot->reloc_count);
2560 /* Next literal immediately follows the first. */
2561 loc += sizeof (Elf32_External_Rela);
2562 bfd_elf32_swap_reloca_in (output_bfd, loc, &irela);
2563 BFD_ASSERT (ELF32_R_TYPE (irela.r_info) == R_XTENSA_RTLD);
2564 irela.r_offset = (sgotplt->output_section->vma
2565 + sgotplt->output_offset + 4);
2566 /* Tell rtld to set value to object's link map. */
2568 bfd_elf32_swap_reloca_out (output_bfd, &irela, loc);
2570 BFD_ASSERT (rtld_reloc <= srelgot->reloc_count);
2572 /* Fill in the literal table. */
2573 if (chunk < plt_chunks - 1)
2574 chunk_entries = PLT_ENTRIES_PER_CHUNK;
2576 chunk_entries = plt_entries - (chunk * PLT_ENTRIES_PER_CHUNK);
2578 BFD_ASSERT ((unsigned) (chunk + 1) * 8 <= spltlittbl->size);
2579 bfd_put_32 (output_bfd,
2580 sgotplt->output_section->vma + sgotplt->output_offset,
2581 spltlittbl->contents + (chunk * 8) + 0);
2582 bfd_put_32 (output_bfd,
2583 8 + (chunk_entries * 4),
2584 spltlittbl->contents + (chunk * 8) + 4);
2587 /* All the dynamic relocations have been emitted at this point.
2588 Make sure the relocation sections are the correct size. */
2589 if (srelgot->size != (sizeof (Elf32_External_Rela)
2590 * srelgot->reloc_count)
2591 || srelplt->size != (sizeof (Elf32_External_Rela)
2592 * srelplt->reloc_count))
2595 /* The .xt.lit.plt section has just been modified. This must
2596 happen before the code below which combines adjacent literal
2597 table entries, and the .xt.lit.plt contents have to be forced to
2599 if (! bfd_set_section_contents (output_bfd,
2600 spltlittbl->output_section,
2601 spltlittbl->contents,
2602 spltlittbl->output_offset,
2605 /* Clear SEC_HAS_CONTENTS so the contents won't be output again. */
2606 spltlittbl->flags &= ~SEC_HAS_CONTENTS;
2609 /* Combine adjacent literal table entries. */
2610 BFD_ASSERT (! info->relocatable);
2611 sxtlit = bfd_get_section_by_name (output_bfd, ".xt.lit");
2612 sgotloc = bfd_get_section_by_name (dynobj, ".got.loc");
2613 BFD_ASSERT (sxtlit && sgotloc);
2615 elf_xtensa_combine_prop_entries (output_bfd, sxtlit, sgotloc);
2616 if (num_xtlit_entries < 0)
2619 dyncon = (Elf32_External_Dyn *) sdyn->contents;
2620 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
2621 for (; dyncon < dynconend; dyncon++)
2623 Elf_Internal_Dyn dyn;
2627 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
2634 case DT_XTENSA_GOT_LOC_SZ:
2635 dyn.d_un.d_val = num_xtlit_entries;
2638 case DT_XTENSA_GOT_LOC_OFF:
2647 s = bfd_get_section_by_name (output_bfd, name);
2649 dyn.d_un.d_ptr = s->vma;
2653 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2655 dyn.d_un.d_val = s->size;
2659 /* Adjust RELASZ to not include JMPREL. This matches what
2660 glibc expects and what is done for several other ELF
2661 targets (e.g., i386, alpha), but the "correct" behavior
2662 seems to be unresolved. Since the linker script arranges
2663 for .rela.plt to follow all other relocation sections, we
2664 don't have to worry about changing the DT_RELA entry. */
2665 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2667 dyn.d_un.d_val -= s->size;
2671 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2678 /* Functions for dealing with the e_flags field. */
2680 /* Merge backend specific data from an object file to the output
2681 object file when linking. */
2684 elf_xtensa_merge_private_bfd_data (bfd *ibfd, bfd *obfd)
2686 unsigned out_mach, in_mach;
2687 flagword out_flag, in_flag;
2689 /* Check if we have the same endianess. */
2690 if (!_bfd_generic_verify_endian_match (ibfd, obfd))
2693 /* Don't even pretend to support mixed-format linking. */
2694 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
2695 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
2698 out_flag = elf_elfheader (obfd)->e_flags;
2699 in_flag = elf_elfheader (ibfd)->e_flags;
2701 out_mach = out_flag & EF_XTENSA_MACH;
2702 in_mach = in_flag & EF_XTENSA_MACH;
2703 if (out_mach != in_mach)
2705 (*_bfd_error_handler)
2706 (_("%B: incompatible machine type. Output is 0x%x. Input is 0x%x"),
2707 ibfd, out_mach, in_mach);
2708 bfd_set_error (bfd_error_wrong_format);
2712 if (! elf_flags_init (obfd))
2714 elf_flags_init (obfd) = TRUE;
2715 elf_elfheader (obfd)->e_flags = in_flag;
2717 if (bfd_get_arch (obfd) == bfd_get_arch (ibfd)
2718 && bfd_get_arch_info (obfd)->the_default)
2719 return bfd_set_arch_mach (obfd, bfd_get_arch (ibfd),
2720 bfd_get_mach (ibfd));
2725 if ((out_flag & EF_XTENSA_XT_INSN) != (in_flag & EF_XTENSA_XT_INSN))
2726 elf_elfheader (obfd)->e_flags &= (~ EF_XTENSA_XT_INSN);
2728 if ((out_flag & EF_XTENSA_XT_LIT) != (in_flag & EF_XTENSA_XT_LIT))
2729 elf_elfheader (obfd)->e_flags &= (~ EF_XTENSA_XT_LIT);
2736 elf_xtensa_set_private_flags (bfd *abfd, flagword flags)
2738 BFD_ASSERT (!elf_flags_init (abfd)
2739 || elf_elfheader (abfd)->e_flags == flags);
2741 elf_elfheader (abfd)->e_flags |= flags;
2742 elf_flags_init (abfd) = TRUE;
2749 elf_xtensa_print_private_bfd_data (bfd *abfd, void *farg)
2751 FILE *f = (FILE *) farg;
2752 flagword e_flags = elf_elfheader (abfd)->e_flags;
2754 fprintf (f, "\nXtensa header:\n");
2755 if ((e_flags & EF_XTENSA_MACH) == E_XTENSA_MACH)
2756 fprintf (f, "\nMachine = Base\n");
2758 fprintf (f, "\nMachine Id = 0x%x\n", e_flags & EF_XTENSA_MACH);
2760 fprintf (f, "Insn tables = %s\n",
2761 (e_flags & EF_XTENSA_XT_INSN) ? "true" : "false");
2763 fprintf (f, "Literal tables = %s\n",
2764 (e_flags & EF_XTENSA_XT_LIT) ? "true" : "false");
2766 return _bfd_elf_print_private_bfd_data (abfd, farg);
2770 /* Set the right machine number for an Xtensa ELF file. */
2773 elf_xtensa_object_p (bfd *abfd)
2776 unsigned long arch = elf_elfheader (abfd)->e_flags & EF_XTENSA_MACH;
2781 mach = bfd_mach_xtensa;
2787 (void) bfd_default_set_arch_mach (abfd, bfd_arch_xtensa, mach);
2792 /* The final processing done just before writing out an Xtensa ELF object
2793 file. This gets the Xtensa architecture right based on the machine
2797 elf_xtensa_final_write_processing (bfd *abfd,
2798 bfd_boolean linker ATTRIBUTE_UNUSED)
2803 switch (mach = bfd_get_mach (abfd))
2805 case bfd_mach_xtensa:
2806 val = E_XTENSA_MACH;
2812 elf_elfheader (abfd)->e_flags &= (~ EF_XTENSA_MACH);
2813 elf_elfheader (abfd)->e_flags |= val;
2817 static enum elf_reloc_type_class
2818 elf_xtensa_reloc_type_class (const Elf_Internal_Rela *rela)
2820 switch ((int) ELF32_R_TYPE (rela->r_info))
2822 case R_XTENSA_RELATIVE:
2823 return reloc_class_relative;
2824 case R_XTENSA_JMP_SLOT:
2825 return reloc_class_plt;
2827 return reloc_class_normal;
2833 elf_xtensa_discard_info_for_section (bfd *abfd,
2834 struct elf_reloc_cookie *cookie,
2835 struct bfd_link_info *info,
2839 bfd_vma section_size;
2840 bfd_vma offset, actual_offset;
2841 size_t removed_bytes = 0;
2843 section_size = sec->size;
2844 if (section_size == 0 || section_size % 8 != 0)
2847 if (sec->output_section
2848 && bfd_is_abs_section (sec->output_section))
2851 contents = retrieve_contents (abfd, sec, info->keep_memory);
2855 cookie->rels = retrieve_internal_relocs (abfd, sec, info->keep_memory);
2858 release_contents (sec, contents);
2862 cookie->rel = cookie->rels;
2863 cookie->relend = cookie->rels + sec->reloc_count;
2865 for (offset = 0; offset < section_size; offset += 8)
2867 actual_offset = offset - removed_bytes;
2869 /* The ...symbol_deleted_p function will skip over relocs but it
2870 won't adjust their offsets, so do that here. */
2871 while (cookie->rel < cookie->relend
2872 && cookie->rel->r_offset < offset)
2874 cookie->rel->r_offset -= removed_bytes;
2878 while (cookie->rel < cookie->relend
2879 && cookie->rel->r_offset == offset)
2881 if (bfd_elf_reloc_symbol_deleted_p (offset, cookie))
2883 /* Remove the table entry. (If the reloc type is NONE, then
2884 the entry has already been merged with another and deleted
2885 during relaxation.) */
2886 if (ELF32_R_TYPE (cookie->rel->r_info) != R_XTENSA_NONE)
2888 /* Shift the contents up. */
2889 if (offset + 8 < section_size)
2890 memmove (&contents[actual_offset],
2891 &contents[actual_offset+8],
2892 section_size - offset - 8);
2896 /* Remove this relocation. */
2897 cookie->rel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
2900 /* Adjust the relocation offset for previous removals. This
2901 should not be done before calling ...symbol_deleted_p
2902 because it might mess up the offset comparisons there.
2903 Make sure the offset doesn't underflow in the case where
2904 the first entry is removed. */
2905 if (cookie->rel->r_offset >= removed_bytes)
2906 cookie->rel->r_offset -= removed_bytes;
2908 cookie->rel->r_offset = 0;
2914 if (removed_bytes != 0)
2916 /* Adjust any remaining relocs (shouldn't be any). */
2917 for (; cookie->rel < cookie->relend; cookie->rel++)
2919 if (cookie->rel->r_offset >= removed_bytes)
2920 cookie->rel->r_offset -= removed_bytes;
2922 cookie->rel->r_offset = 0;
2925 /* Clear the removed bytes. */
2926 memset (&contents[section_size - removed_bytes], 0, removed_bytes);
2928 pin_contents (sec, contents);
2929 pin_internal_relocs (sec, cookie->rels);
2932 sec->size = section_size - removed_bytes;
2934 if (xtensa_is_littable_section (sec))
2936 bfd *dynobj = elf_hash_table (info)->dynobj;
2940 bfd_get_section_by_name (dynobj, ".got.loc");
2942 sgotloc->size -= removed_bytes;
2948 release_contents (sec, contents);
2949 release_internal_relocs (sec, cookie->rels);
2952 return (removed_bytes != 0);
2957 elf_xtensa_discard_info (bfd *abfd,
2958 struct elf_reloc_cookie *cookie,
2959 struct bfd_link_info *info)
2962 bfd_boolean changed = FALSE;
2964 for (sec = abfd->sections; sec != NULL; sec = sec->next)
2966 if (xtensa_is_property_section (sec))
2968 if (elf_xtensa_discard_info_for_section (abfd, cookie, info, sec))
2978 elf_xtensa_ignore_discarded_relocs (asection *sec)
2980 return xtensa_is_property_section (sec);
2984 /* Support for core dump NOTE sections. */
2987 elf_xtensa_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
2992 /* The size for Xtensa is variable, so don't try to recognize the format
2993 based on the size. Just assume this is GNU/Linux. */
2996 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12);
2999 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24);
3003 size = note->descsz - offset - 4;
3005 /* Make a ".reg/999" section. */
3006 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
3007 size, note->descpos + offset);
3012 elf_xtensa_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
3014 switch (note->descsz)
3019 case 128: /* GNU/Linux elf_prpsinfo */
3020 elf_tdata (abfd)->core_program
3021 = _bfd_elfcore_strndup (abfd, note->descdata + 32, 16);
3022 elf_tdata (abfd)->core_command
3023 = _bfd_elfcore_strndup (abfd, note->descdata + 48, 80);
3026 /* Note that for some reason, a spurious space is tacked
3027 onto the end of the args in some (at least one anyway)
3028 implementations, so strip it off if it exists. */
3031 char *command = elf_tdata (abfd)->core_command;
3032 int n = strlen (command);
3034 if (0 < n && command[n - 1] == ' ')
3035 command[n - 1] = '\0';
3042 /* Generic Xtensa configurability stuff. */
3044 static xtensa_opcode callx0_op = XTENSA_UNDEFINED;
3045 static xtensa_opcode callx4_op = XTENSA_UNDEFINED;
3046 static xtensa_opcode callx8_op = XTENSA_UNDEFINED;
3047 static xtensa_opcode callx12_op = XTENSA_UNDEFINED;
3048 static xtensa_opcode call0_op = XTENSA_UNDEFINED;
3049 static xtensa_opcode call4_op = XTENSA_UNDEFINED;
3050 static xtensa_opcode call8_op = XTENSA_UNDEFINED;
3051 static xtensa_opcode call12_op = XTENSA_UNDEFINED;
3054 init_call_opcodes (void)
3056 if (callx0_op == XTENSA_UNDEFINED)
3058 callx0_op = xtensa_opcode_lookup (xtensa_default_isa, "callx0");
3059 callx4_op = xtensa_opcode_lookup (xtensa_default_isa, "callx4");
3060 callx8_op = xtensa_opcode_lookup (xtensa_default_isa, "callx8");
3061 callx12_op = xtensa_opcode_lookup (xtensa_default_isa, "callx12");
3062 call0_op = xtensa_opcode_lookup (xtensa_default_isa, "call0");
3063 call4_op = xtensa_opcode_lookup (xtensa_default_isa, "call4");
3064 call8_op = xtensa_opcode_lookup (xtensa_default_isa, "call8");
3065 call12_op = xtensa_opcode_lookup (xtensa_default_isa, "call12");
3071 is_indirect_call_opcode (xtensa_opcode opcode)
3073 init_call_opcodes ();
3074 return (opcode == callx0_op
3075 || opcode == callx4_op
3076 || opcode == callx8_op
3077 || opcode == callx12_op);
3082 is_direct_call_opcode (xtensa_opcode opcode)
3084 init_call_opcodes ();
3085 return (opcode == call0_op
3086 || opcode == call4_op
3087 || opcode == call8_op
3088 || opcode == call12_op);
3093 is_windowed_call_opcode (xtensa_opcode opcode)
3095 init_call_opcodes ();
3096 return (opcode == call4_op
3097 || opcode == call8_op
3098 || opcode == call12_op
3099 || opcode == callx4_op
3100 || opcode == callx8_op
3101 || opcode == callx12_op);
3105 static xtensa_opcode
3106 get_const16_opcode (void)
3108 static bfd_boolean done_lookup = FALSE;
3109 static xtensa_opcode const16_opcode = XTENSA_UNDEFINED;
3112 const16_opcode = xtensa_opcode_lookup (xtensa_default_isa, "const16");
3115 return const16_opcode;
3119 static xtensa_opcode
3120 get_l32r_opcode (void)
3122 static xtensa_opcode l32r_opcode = XTENSA_UNDEFINED;
3123 static bfd_boolean done_lookup = FALSE;
3127 l32r_opcode = xtensa_opcode_lookup (xtensa_default_isa, "l32r");
3135 l32r_offset (bfd_vma addr, bfd_vma pc)
3139 offset = addr - ((pc+3) & -4);
3140 BFD_ASSERT ((offset & ((1 << 2) - 1)) == 0);
3141 offset = (signed int) offset >> 2;
3142 BFD_ASSERT ((signed int) offset >> 16 == -1);
3148 get_relocation_opnd (xtensa_opcode opcode, int r_type)
3150 xtensa_isa isa = xtensa_default_isa;
3151 int last_immed, last_opnd, opi;
3153 if (opcode == XTENSA_UNDEFINED)
3154 return XTENSA_UNDEFINED;
3156 /* Find the last visible PC-relative immediate operand for the opcode.
3157 If there are no PC-relative immediates, then choose the last visible
3158 immediate; otherwise, fail and return XTENSA_UNDEFINED. */
3159 last_immed = XTENSA_UNDEFINED;
3160 last_opnd = xtensa_opcode_num_operands (isa, opcode);
3161 for (opi = last_opnd - 1; opi >= 0; opi--)
3163 if (xtensa_operand_is_visible (isa, opcode, opi) == 0)
3165 if (xtensa_operand_is_PCrelative (isa, opcode, opi) == 1)
3170 if (last_immed == XTENSA_UNDEFINED
3171 && xtensa_operand_is_register (isa, opcode, opi) == 0)
3175 return XTENSA_UNDEFINED;
3177 /* If the operand number was specified in an old-style relocation,
3178 check for consistency with the operand computed above. */
3179 if (r_type >= R_XTENSA_OP0 && r_type <= R_XTENSA_OP2)
3181 int reloc_opnd = r_type - R_XTENSA_OP0;
3182 if (reloc_opnd != last_immed)
3183 return XTENSA_UNDEFINED;
3191 get_relocation_slot (int r_type)
3201 if (r_type >= R_XTENSA_SLOT0_OP && r_type <= R_XTENSA_SLOT14_OP)
3202 return r_type - R_XTENSA_SLOT0_OP;
3203 if (r_type >= R_XTENSA_SLOT0_ALT && r_type <= R_XTENSA_SLOT14_ALT)
3204 return r_type - R_XTENSA_SLOT0_ALT;
3208 return XTENSA_UNDEFINED;
3212 /* Get the opcode for a relocation. */
3214 static xtensa_opcode
3215 get_relocation_opcode (bfd *abfd,
3218 Elf_Internal_Rela *irel)
3220 static xtensa_insnbuf ibuff = NULL;
3221 static xtensa_insnbuf sbuff = NULL;
3222 xtensa_isa isa = xtensa_default_isa;
3226 if (contents == NULL)
3227 return XTENSA_UNDEFINED;
3229 if (bfd_get_section_limit (abfd, sec) <= irel->r_offset)
3230 return XTENSA_UNDEFINED;
3234 ibuff = xtensa_insnbuf_alloc (isa);
3235 sbuff = xtensa_insnbuf_alloc (isa);
3238 /* Decode the instruction. */
3239 xtensa_insnbuf_from_chars (isa, ibuff, &contents[irel->r_offset],
3240 sec->size - irel->r_offset);
3241 fmt = xtensa_format_decode (isa, ibuff);
3242 slot = get_relocation_slot (ELF32_R_TYPE (irel->r_info));
3243 if (slot == XTENSA_UNDEFINED)
3244 return XTENSA_UNDEFINED;
3245 xtensa_format_get_slot (isa, fmt, slot, ibuff, sbuff);
3246 return xtensa_opcode_decode (isa, fmt, slot, sbuff);
3251 is_l32r_relocation (bfd *abfd,
3254 Elf_Internal_Rela *irel)
3256 xtensa_opcode opcode;
3257 if (!is_operand_relocation (ELF32_R_TYPE (irel->r_info)))
3259 opcode = get_relocation_opcode (abfd, sec, contents, irel);
3260 return (opcode == get_l32r_opcode ());
3264 static bfd_size_type
3265 get_asm_simplify_size (bfd_byte *contents,
3266 bfd_size_type content_len,
3267 bfd_size_type offset)
3269 bfd_size_type insnlen, size = 0;
3271 /* Decode the size of the next two instructions. */
3272 insnlen = insn_decode_len (contents, content_len, offset);
3278 insnlen = insn_decode_len (contents, content_len, offset + size);
3288 is_alt_relocation (int r_type)
3290 return (r_type >= R_XTENSA_SLOT0_ALT
3291 && r_type <= R_XTENSA_SLOT14_ALT);
3296 is_operand_relocation (int r_type)
3306 if (r_type >= R_XTENSA_SLOT0_OP && r_type <= R_XTENSA_SLOT14_OP)
3308 if (r_type >= R_XTENSA_SLOT0_ALT && r_type <= R_XTENSA_SLOT14_ALT)
3317 #define MIN_INSN_LENGTH 2
3319 /* Return 0 if it fails to decode. */
3322 insn_decode_len (bfd_byte *contents,
3323 bfd_size_type content_len,
3324 bfd_size_type offset)
3327 xtensa_isa isa = xtensa_default_isa;
3329 static xtensa_insnbuf ibuff = NULL;
3331 if (offset + MIN_INSN_LENGTH > content_len)
3335 ibuff = xtensa_insnbuf_alloc (isa);
3336 xtensa_insnbuf_from_chars (isa, ibuff, &contents[offset],
3337 content_len - offset);
3338 fmt = xtensa_format_decode (isa, ibuff);
3339 if (fmt == XTENSA_UNDEFINED)
3341 insn_len = xtensa_format_length (isa, fmt);
3342 if (insn_len == XTENSA_UNDEFINED)
3348 /* Decode the opcode for a single slot instruction.
3349 Return 0 if it fails to decode or the instruction is multi-slot. */
3352 insn_decode_opcode (bfd_byte *contents,
3353 bfd_size_type content_len,
3354 bfd_size_type offset,
3357 xtensa_isa isa = xtensa_default_isa;
3359 static xtensa_insnbuf insnbuf = NULL;
3360 static xtensa_insnbuf slotbuf = NULL;
3362 if (offset + MIN_INSN_LENGTH > content_len)
3363 return XTENSA_UNDEFINED;
3365 if (insnbuf == NULL)
3367 insnbuf = xtensa_insnbuf_alloc (isa);
3368 slotbuf = xtensa_insnbuf_alloc (isa);
3371 xtensa_insnbuf_from_chars (isa, insnbuf, &contents[offset],
3372 content_len - offset);
3373 fmt = xtensa_format_decode (isa, insnbuf);
3374 if (fmt == XTENSA_UNDEFINED)
3375 return XTENSA_UNDEFINED;
3377 if (slot >= xtensa_format_num_slots (isa, fmt))
3378 return XTENSA_UNDEFINED;
3380 xtensa_format_get_slot (isa, fmt, slot, insnbuf, slotbuf);
3381 return xtensa_opcode_decode (isa, fmt, slot, slotbuf);
3385 /* The offset is the offset in the contents.
3386 The address is the address of that offset. */
3389 check_branch_target_aligned (bfd_byte *contents,
3390 bfd_size_type content_length,
3394 bfd_size_type insn_len = insn_decode_len (contents, content_length, offset);
3397 return check_branch_target_aligned_address (address, insn_len);
3402 check_loop_aligned (bfd_byte *contents,
3403 bfd_size_type content_length,
3407 bfd_size_type loop_len, insn_len;
3408 xtensa_opcode opcode;
3410 opcode = insn_decode_opcode (contents, content_length, offset, 0);
3411 if (opcode == XTENSA_UNDEFINED
3412 || xtensa_opcode_is_loop (xtensa_default_isa, opcode) != 1)
3418 loop_len = insn_decode_len (contents, content_length, offset);
3419 insn_len = insn_decode_len (contents, content_length, offset + loop_len);
3420 if (loop_len == 0 || insn_len == 0)
3426 return check_branch_target_aligned_address (address + loop_len, insn_len);
3431 check_branch_target_aligned_address (bfd_vma addr, int len)
3434 return (addr % 8 == 0);
3435 return ((addr >> 2) == ((addr + len - 1) >> 2));
3439 /* Instruction widening and narrowing. */
3441 /* When FLIX is available we need to access certain instructions only
3442 when they are 16-bit or 24-bit instructions. This table caches
3443 information about such instructions by walking through all the
3444 opcodes and finding the smallest single-slot format into which each
3447 static xtensa_format *op_single_fmt_table = NULL;
3451 init_op_single_format_table (void)
3453 xtensa_isa isa = xtensa_default_isa;
3454 xtensa_insnbuf ibuf;
3455 xtensa_opcode opcode;
3459 if (op_single_fmt_table)
3462 ibuf = xtensa_insnbuf_alloc (isa);
3463 num_opcodes = xtensa_isa_num_opcodes (isa);
3465 op_single_fmt_table = (xtensa_format *)
3466 bfd_malloc (sizeof (xtensa_format) * num_opcodes);
3467 for (opcode = 0; opcode < num_opcodes; opcode++)
3469 op_single_fmt_table[opcode] = XTENSA_UNDEFINED;
3470 for (fmt = 0; fmt < xtensa_isa_num_formats (isa); fmt++)
3472 if (xtensa_format_num_slots (isa, fmt) == 1
3473 && xtensa_opcode_encode (isa, fmt, 0, ibuf, opcode) == 0)
3475 xtensa_opcode old_fmt = op_single_fmt_table[opcode];
3476 int fmt_length = xtensa_format_length (isa, fmt);
3477 if (old_fmt == XTENSA_UNDEFINED
3478 || fmt_length < xtensa_format_length (isa, old_fmt))
3479 op_single_fmt_table[opcode] = fmt;
3483 xtensa_insnbuf_free (isa, ibuf);
3487 static xtensa_format
3488 get_single_format (xtensa_opcode opcode)
3490 init_op_single_format_table ();
3491 return op_single_fmt_table[opcode];
3495 /* For the set of narrowable instructions we do NOT include the
3496 narrowings beqz -> beqz.n or bnez -> bnez.n because of complexities
3497 involved during linker relaxation that may require these to
3498 re-expand in some conditions. Also, the narrowing "or" -> mov.n
3499 requires special case code to ensure it only works when op1 == op2. */
3507 struct string_pair narrowable[] =
3510 { "addi", "addi.n" },
3511 { "addmi", "addi.n" },
3512 { "l32i", "l32i.n" },
3513 { "movi", "movi.n" },
3515 { "retw", "retw.n" },
3516 { "s32i", "s32i.n" },
3517 { "or", "mov.n" } /* special case only when op1 == op2 */
3520 struct string_pair widenable[] =
3523 { "addi", "addi.n" },
3524 { "addmi", "addi.n" },
3525 { "beqz", "beqz.n" },
3526 { "bnez", "bnez.n" },
3527 { "l32i", "l32i.n" },
3528 { "movi", "movi.n" },
3530 { "retw", "retw.n" },
3531 { "s32i", "s32i.n" },
3532 { "or", "mov.n" } /* special case only when op1 == op2 */
3536 /* Check if an instruction can be "narrowed", i.e., changed from a standard
3537 3-byte instruction to a 2-byte "density" instruction. If it is valid,
3538 return the instruction buffer holding the narrow instruction. Otherwise,
3539 return 0. The set of valid narrowing are specified by a string table
3540 but require some special case operand checks in some cases. */
3542 static xtensa_insnbuf
3543 can_narrow_instruction (xtensa_insnbuf slotbuf,
3545 xtensa_opcode opcode)
3547 xtensa_isa isa = xtensa_default_isa;
3548 xtensa_format o_fmt;
3551 static xtensa_insnbuf o_insnbuf = NULL;
3552 static xtensa_insnbuf o_slotbuf = NULL;
3554 if (o_insnbuf == NULL)
3556 o_insnbuf = xtensa_insnbuf_alloc (isa);
3557 o_slotbuf = xtensa_insnbuf_alloc (isa);
3560 for (opi = 0; opi < (sizeof (narrowable)/sizeof (struct string_pair)); opi++)
3562 bfd_boolean is_or = (strcmp ("or", narrowable[opi].wide) == 0);
3564 if (opcode == xtensa_opcode_lookup (isa, narrowable[opi].wide))
3566 uint32 value, newval;
3567 int i, operand_count, o_operand_count;
3568 xtensa_opcode o_opcode;
3570 /* Address does not matter in this case. We might need to
3571 fix it to handle branches/jumps. */
3572 bfd_vma self_address = 0;
3574 o_opcode = xtensa_opcode_lookup (isa, narrowable[opi].narrow);
3575 if (o_opcode == XTENSA_UNDEFINED)
3577 o_fmt = get_single_format (o_opcode);
3578 if (o_fmt == XTENSA_UNDEFINED)
3581 if (xtensa_format_length (isa, fmt) != 3
3582 || xtensa_format_length (isa, o_fmt) != 2)
3585 xtensa_format_encode (isa, o_fmt, o_insnbuf);
3586 operand_count = xtensa_opcode_num_operands (isa, opcode);
3587 o_operand_count = xtensa_opcode_num_operands (isa, o_opcode);
3589 if (xtensa_opcode_encode (isa, o_fmt, 0, o_slotbuf, o_opcode) != 0)
3594 if (xtensa_opcode_num_operands (isa, o_opcode) != operand_count)
3599 uint32 rawval0, rawval1, rawval2;
3601 if (o_operand_count + 1 != operand_count
3602 || xtensa_operand_get_field (isa, opcode, 0,
3603 fmt, 0, slotbuf, &rawval0) != 0
3604 || xtensa_operand_get_field (isa, opcode, 1,
3605 fmt, 0, slotbuf, &rawval1) != 0
3606 || xtensa_operand_get_field (isa, opcode, 2,
3607 fmt, 0, slotbuf, &rawval2) != 0
3608 || rawval1 != rawval2
3609 || rawval0 == rawval1 /* it is a nop */)
3613 for (i = 0; i < o_operand_count; ++i)
3615 if (xtensa_operand_get_field (isa, opcode, i, fmt, 0,
3617 || xtensa_operand_decode (isa, opcode, i, &value))
3620 /* PC-relative branches need adjustment, but
3621 the PC-rel operand will always have a relocation. */
3623 if (xtensa_operand_do_reloc (isa, o_opcode, i, &newval,
3625 || xtensa_operand_encode (isa, o_opcode, i, &newval)
3626 || xtensa_operand_set_field (isa, o_opcode, i, o_fmt, 0,
3631 if (xtensa_format_set_slot (isa, o_fmt, 0, o_insnbuf, o_slotbuf))
3641 /* Attempt to narrow an instruction. If the narrowing is valid, perform
3642 the action in-place directly into the contents and return TRUE. Otherwise,
3643 the return value is FALSE and the contents are not modified. */
3646 narrow_instruction (bfd_byte *contents,
3647 bfd_size_type content_length,
3648 bfd_size_type offset)
3650 xtensa_opcode opcode;
3651 bfd_size_type insn_len;
3652 xtensa_isa isa = xtensa_default_isa;
3654 xtensa_insnbuf o_insnbuf;
3656 static xtensa_insnbuf insnbuf = NULL;
3657 static xtensa_insnbuf slotbuf = NULL;
3659 if (insnbuf == NULL)
3661 insnbuf = xtensa_insnbuf_alloc (isa);
3662 slotbuf = xtensa_insnbuf_alloc (isa);
3665 BFD_ASSERT (offset < content_length);
3667 if (content_length < 2)
3670 /* We will hand-code a few of these for a little while.
3671 These have all been specified in the assembler aleady. */
3672 xtensa_insnbuf_from_chars (isa, insnbuf, &contents[offset],
3673 content_length - offset);
3674 fmt = xtensa_format_decode (isa, insnbuf);
3675 if (xtensa_format_num_slots (isa, fmt) != 1)
3678 if (xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf) != 0)
3681 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
3682 if (opcode == XTENSA_UNDEFINED)
3684 insn_len = xtensa_format_length (isa, fmt);
3685 if (insn_len > content_length)
3688 o_insnbuf = can_narrow_instruction (slotbuf, fmt, opcode);
3691 xtensa_insnbuf_to_chars (isa, o_insnbuf, contents + offset,
3692 content_length - offset);
3700 /* Check if an instruction can be "widened", i.e., changed from a 2-byte
3701 "density" instruction to a standard 3-byte instruction. If it is valid,
3702 return the instruction buffer holding the wide instruction. Otherwise,
3703 return 0. The set of valid widenings are specified by a string table
3704 but require some special case operand checks in some cases. */
3706 static xtensa_insnbuf
3707 can_widen_instruction (xtensa_insnbuf slotbuf,
3709 xtensa_opcode opcode)
3711 xtensa_isa isa = xtensa_default_isa;
3712 xtensa_format o_fmt;
3715 static xtensa_insnbuf o_insnbuf = NULL;
3716 static xtensa_insnbuf o_slotbuf = NULL;
3718 if (o_insnbuf == NULL)
3720 o_insnbuf = xtensa_insnbuf_alloc (isa);
3721 o_slotbuf = xtensa_insnbuf_alloc (isa);
3724 for (opi = 0; opi < (sizeof (widenable)/sizeof (struct string_pair)); opi++)
3726 bfd_boolean is_or = (strcmp ("or", widenable[opi].wide) == 0);
3727 bfd_boolean is_branch = (strcmp ("beqz", widenable[opi].wide) == 0
3728 || strcmp ("bnez", widenable[opi].wide) == 0);
3730 if (opcode == xtensa_opcode_lookup (isa, widenable[opi].narrow))
3732 uint32 value, newval;
3733 int i, operand_count, o_operand_count, check_operand_count;
3734 xtensa_opcode o_opcode;
3736 /* Address does not matter in this case. We might need to fix it
3737 to handle branches/jumps. */
3738 bfd_vma self_address = 0;
3740 o_opcode = xtensa_opcode_lookup (isa, widenable[opi].wide);
3741 if (o_opcode == XTENSA_UNDEFINED)
3743 o_fmt = get_single_format (o_opcode);
3744 if (o_fmt == XTENSA_UNDEFINED)
3747 if (xtensa_format_length (isa, fmt) != 2
3748 || xtensa_format_length (isa, o_fmt) != 3)
3751 xtensa_format_encode (isa, o_fmt, o_insnbuf);
3752 operand_count = xtensa_opcode_num_operands (isa, opcode);
3753 o_operand_count = xtensa_opcode_num_operands (isa, o_opcode);
3754 check_operand_count = o_operand_count;
3756 if (xtensa_opcode_encode (isa, o_fmt, 0, o_slotbuf, o_opcode) != 0)
3761 if (xtensa_opcode_num_operands (isa, o_opcode) != operand_count)
3766 uint32 rawval0, rawval1;
3768 if (o_operand_count != operand_count + 1
3769 || xtensa_operand_get_field (isa, opcode, 0,
3770 fmt, 0, slotbuf, &rawval0) != 0
3771 || xtensa_operand_get_field (isa, opcode, 1,
3772 fmt, 0, slotbuf, &rawval1) != 0
3773 || rawval0 == rawval1 /* it is a nop */)
3777 check_operand_count--;
3779 for (i = 0; i < check_operand_count; i++)
3782 if (is_or && i == o_operand_count - 1)
3784 if (xtensa_operand_get_field (isa, opcode, new_i, fmt, 0,
3786 || xtensa_operand_decode (isa, opcode, new_i, &value))
3789 /* PC-relative branches need adjustment, but
3790 the PC-rel operand will always have a relocation. */
3792 if (xtensa_operand_do_reloc (isa, o_opcode, i, &newval,
3794 || xtensa_operand_encode (isa, o_opcode, i, &newval)
3795 || xtensa_operand_set_field (isa, o_opcode, i, o_fmt, 0,
3800 if (xtensa_format_set_slot (isa, o_fmt, 0, o_insnbuf, o_slotbuf))
3810 /* Attempt to widen an instruction. If the widening is valid, perform
3811 the action in-place directly into the contents and return TRUE. Otherwise,
3812 the return value is FALSE and the contents are not modified. */
3815 widen_instruction (bfd_byte *contents,
3816 bfd_size_type content_length,
3817 bfd_size_type offset)
3819 xtensa_opcode opcode;
3820 bfd_size_type insn_len;
3821 xtensa_isa isa = xtensa_default_isa;
3823 xtensa_insnbuf o_insnbuf;
3825 static xtensa_insnbuf insnbuf = NULL;
3826 static xtensa_insnbuf slotbuf = NULL;
3828 if (insnbuf == NULL)
3830 insnbuf = xtensa_insnbuf_alloc (isa);
3831 slotbuf = xtensa_insnbuf_alloc (isa);
3834 BFD_ASSERT (offset < content_length);
3836 if (content_length < 2)
3839 /* We will hand-code a few of these for a little while.
3840 These have all been specified in the assembler aleady. */
3841 xtensa_insnbuf_from_chars (isa, insnbuf, &contents[offset],
3842 content_length - offset);
3843 fmt = xtensa_format_decode (isa, insnbuf);
3844 if (xtensa_format_num_slots (isa, fmt) != 1)
3847 if (xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf) != 0)
3850 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
3851 if (opcode == XTENSA_UNDEFINED)
3853 insn_len = xtensa_format_length (isa, fmt);
3854 if (insn_len > content_length)
3857 o_insnbuf = can_widen_instruction (slotbuf, fmt, opcode);
3860 xtensa_insnbuf_to_chars (isa, o_insnbuf, contents + offset,
3861 content_length - offset);
3868 /* Code for transforming CALLs at link-time. */
3870 static bfd_reloc_status_type
3871 elf_xtensa_do_asm_simplify (bfd_byte *contents,
3873 bfd_vma content_length,
3874 char **error_message)
3876 static xtensa_insnbuf insnbuf = NULL;
3877 static xtensa_insnbuf slotbuf = NULL;
3878 xtensa_format core_format = XTENSA_UNDEFINED;
3879 xtensa_opcode opcode;
3880 xtensa_opcode direct_call_opcode;
3881 xtensa_isa isa = xtensa_default_isa;
3882 bfd_byte *chbuf = contents + address;
3885 if (insnbuf == NULL)
3887 insnbuf = xtensa_insnbuf_alloc (isa);
3888 slotbuf = xtensa_insnbuf_alloc (isa);
3891 if (content_length < address)
3893 *error_message = _("Attempt to convert L32R/CALLX to CALL failed");
3894 return bfd_reloc_other;
3897 opcode = get_expanded_call_opcode (chbuf, content_length - address, 0);
3898 direct_call_opcode = swap_callx_for_call_opcode (opcode);
3899 if (direct_call_opcode == XTENSA_UNDEFINED)
3901 *error_message = _("Attempt to convert L32R/CALLX to CALL failed");
3902 return bfd_reloc_other;
3905 /* Assemble a NOP ("or a1, a1, a1") into the 0 byte offset. */
3906 core_format = xtensa_format_lookup (isa, "x24");
3907 opcode = xtensa_opcode_lookup (isa, "or");
3908 xtensa_opcode_encode (isa, core_format, 0, slotbuf, opcode);
3909 for (opn = 0; opn < 3; opn++)
3912 xtensa_operand_encode (isa, opcode, opn, ®no);
3913 xtensa_operand_set_field (isa, opcode, opn, core_format, 0,
3916 xtensa_format_encode (isa, core_format, insnbuf);
3917 xtensa_format_set_slot (isa, core_format, 0, insnbuf, slotbuf);
3918 xtensa_insnbuf_to_chars (isa, insnbuf, chbuf, content_length - address);
3920 /* Assemble a CALL ("callN 0") into the 3 byte offset. */
3921 xtensa_opcode_encode (isa, core_format, 0, slotbuf, direct_call_opcode);
3922 xtensa_operand_set_field (isa, opcode, 0, core_format, 0, slotbuf, 0);
3924 xtensa_format_encode (isa, core_format, insnbuf);
3925 xtensa_format_set_slot (isa, core_format, 0, insnbuf, slotbuf);
3926 xtensa_insnbuf_to_chars (isa, insnbuf, chbuf + 3,
3927 content_length - address - 3);
3929 return bfd_reloc_ok;
3933 static bfd_reloc_status_type
3934 contract_asm_expansion (bfd_byte *contents,
3935 bfd_vma content_length,
3936 Elf_Internal_Rela *irel,
3937 char **error_message)
3939 bfd_reloc_status_type retval =
3940 elf_xtensa_do_asm_simplify (contents, irel->r_offset, content_length,
3943 if (retval != bfd_reloc_ok)
3944 return bfd_reloc_dangerous;
3946 /* Update the irel->r_offset field so that the right immediate and
3947 the right instruction are modified during the relocation. */
3948 irel->r_offset += 3;
3949 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), R_XTENSA_SLOT0_OP);
3950 return bfd_reloc_ok;
3954 static xtensa_opcode
3955 swap_callx_for_call_opcode (xtensa_opcode opcode)
3957 init_call_opcodes ();
3959 if (opcode == callx0_op) return call0_op;
3960 if (opcode == callx4_op) return call4_op;
3961 if (opcode == callx8_op) return call8_op;
3962 if (opcode == callx12_op) return call12_op;
3964 /* Return XTENSA_UNDEFINED if the opcode is not an indirect call. */
3965 return XTENSA_UNDEFINED;
3969 /* Check if "buf" is pointing to a "L32R aN; CALLX aN" or "CONST16 aN;
3970 CONST16 aN; CALLX aN" sequence, and if so, return the CALLX opcode.
3971 If not, return XTENSA_UNDEFINED. */
3973 #define L32R_TARGET_REG_OPERAND 0
3974 #define CONST16_TARGET_REG_OPERAND 0
3975 #define CALLN_SOURCE_OPERAND 0
3977 static xtensa_opcode
3978 get_expanded_call_opcode (bfd_byte *buf, int bufsize, bfd_boolean *p_uses_l32r)
3980 static xtensa_insnbuf insnbuf = NULL;
3981 static xtensa_insnbuf slotbuf = NULL;
3983 xtensa_opcode opcode;
3984 xtensa_isa isa = xtensa_default_isa;
3985 uint32 regno, const16_regno, call_regno;
3988 if (insnbuf == NULL)
3990 insnbuf = xtensa_insnbuf_alloc (isa);
3991 slotbuf = xtensa_insnbuf_alloc (isa);
3994 xtensa_insnbuf_from_chars (isa, insnbuf, buf, bufsize);
3995 fmt = xtensa_format_decode (isa, insnbuf);
3996 if (fmt == XTENSA_UNDEFINED
3997 || xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf))
3998 return XTENSA_UNDEFINED;
4000 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
4001 if (opcode == XTENSA_UNDEFINED)
4002 return XTENSA_UNDEFINED;
4004 if (opcode == get_l32r_opcode ())
4007 *p_uses_l32r = TRUE;
4008 if (xtensa_operand_get_field (isa, opcode, L32R_TARGET_REG_OPERAND,
4009 fmt, 0, slotbuf, ®no)
4010 || xtensa_operand_decode (isa, opcode, L32R_TARGET_REG_OPERAND,
4012 return XTENSA_UNDEFINED;
4014 else if (opcode == get_const16_opcode ())
4017 *p_uses_l32r = FALSE;
4018 if (xtensa_operand_get_field (isa, opcode, CONST16_TARGET_REG_OPERAND,
4019 fmt, 0, slotbuf, ®no)
4020 || xtensa_operand_decode (isa, opcode, CONST16_TARGET_REG_OPERAND,
4022 return XTENSA_UNDEFINED;
4024 /* Check that the next instruction is also CONST16. */
4025 offset += xtensa_format_length (isa, fmt);
4026 xtensa_insnbuf_from_chars (isa, insnbuf, buf + offset, bufsize - offset);
4027 fmt = xtensa_format_decode (isa, insnbuf);
4028 if (fmt == XTENSA_UNDEFINED
4029 || xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf))
4030 return XTENSA_UNDEFINED;
4031 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
4032 if (opcode != get_const16_opcode ())
4033 return XTENSA_UNDEFINED;
4035 if (xtensa_operand_get_field (isa, opcode, CONST16_TARGET_REG_OPERAND,
4036 fmt, 0, slotbuf, &const16_regno)
4037 || xtensa_operand_decode (isa, opcode, CONST16_TARGET_REG_OPERAND,
4039 || const16_regno != regno)
4040 return XTENSA_UNDEFINED;
4043 return XTENSA_UNDEFINED;
4045 /* Next instruction should be an CALLXn with operand 0 == regno. */
4046 offset += xtensa_format_length (isa, fmt);
4047 xtensa_insnbuf_from_chars (isa, insnbuf, buf + offset, bufsize - offset);
4048 fmt = xtensa_format_decode (isa, insnbuf);
4049 if (fmt == XTENSA_UNDEFINED
4050 || xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf))
4051 return XTENSA_UNDEFINED;
4052 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
4053 if (opcode == XTENSA_UNDEFINED
4054 || !is_indirect_call_opcode (opcode))
4055 return XTENSA_UNDEFINED;
4057 if (xtensa_operand_get_field (isa, opcode, CALLN_SOURCE_OPERAND,
4058 fmt, 0, slotbuf, &call_regno)
4059 || xtensa_operand_decode (isa, opcode, CALLN_SOURCE_OPERAND,
4061 return XTENSA_UNDEFINED;
4063 if (call_regno != regno)
4064 return XTENSA_UNDEFINED;
4070 /* Data structures used during relaxation. */
4072 /* r_reloc: relocation values. */
4074 /* Through the relaxation process, we need to keep track of the values
4075 that will result from evaluating relocations. The standard ELF
4076 relocation structure is not sufficient for this purpose because we're
4077 operating on multiple input files at once, so we need to know which
4078 input file a relocation refers to. The r_reloc structure thus
4079 records both the input file (bfd) and ELF relocation.
4081 For efficiency, an r_reloc also contains a "target_offset" field to
4082 cache the target-section-relative offset value that is represented by
4085 The r_reloc also contains a virtual offset that allows multiple
4086 inserted literals to be placed at the same "address" with
4087 different offsets. */
4089 typedef struct r_reloc_struct r_reloc;
4091 struct r_reloc_struct
4094 Elf_Internal_Rela rela;
4095 bfd_vma target_offset;
4096 bfd_vma virtual_offset;
4100 /* The r_reloc structure is included by value in literal_value, but not
4101 every literal_value has an associated relocation -- some are simple
4102 constants. In such cases, we set all the fields in the r_reloc
4103 struct to zero. The r_reloc_is_const function should be used to
4104 detect this case. */
4107 r_reloc_is_const (const r_reloc *r_rel)
4109 return (r_rel->abfd == NULL);
4114 r_reloc_get_target_offset (const r_reloc *r_rel)
4116 bfd_vma target_offset;
4117 unsigned long r_symndx;
4119 BFD_ASSERT (!r_reloc_is_const (r_rel));
4120 r_symndx = ELF32_R_SYM (r_rel->rela.r_info);
4121 target_offset = get_elf_r_symndx_offset (r_rel->abfd, r_symndx);
4122 return (target_offset + r_rel->rela.r_addend);
4126 static struct elf_link_hash_entry *
4127 r_reloc_get_hash_entry (const r_reloc *r_rel)
4129 unsigned long r_symndx = ELF32_R_SYM (r_rel->rela.r_info);
4130 return get_elf_r_symndx_hash_entry (r_rel->abfd, r_symndx);
4135 r_reloc_get_section (const r_reloc *r_rel)
4137 unsigned long r_symndx = ELF32_R_SYM (r_rel->rela.r_info);
4138 return get_elf_r_symndx_section (r_rel->abfd, r_symndx);
4143 r_reloc_is_defined (const r_reloc *r_rel)
4149 sec = r_reloc_get_section (r_rel);
4150 if (sec == bfd_abs_section_ptr
4151 || sec == bfd_com_section_ptr
4152 || sec == bfd_und_section_ptr)
4159 r_reloc_init (r_reloc *r_rel,
4161 Elf_Internal_Rela *irel,
4163 bfd_size_type content_length)
4166 reloc_howto_type *howto;
4170 r_rel->rela = *irel;
4172 r_rel->target_offset = r_reloc_get_target_offset (r_rel);
4173 r_rel->virtual_offset = 0;
4174 r_type = ELF32_R_TYPE (r_rel->rela.r_info);
4175 howto = &elf_howto_table[r_type];
4176 if (howto->partial_inplace)
4178 bfd_vma inplace_val;
4179 BFD_ASSERT (r_rel->rela.r_offset < content_length);
4181 inplace_val = bfd_get_32 (abfd, &contents[r_rel->rela.r_offset]);
4182 r_rel->target_offset += inplace_val;
4186 memset (r_rel, 0, sizeof (r_reloc));
4193 print_r_reloc (FILE *fp, const r_reloc *r_rel)
4195 if (r_reloc_is_defined (r_rel))
4197 asection *sec = r_reloc_get_section (r_rel);
4198 fprintf (fp, " %s(%s + ", sec->owner->filename, sec->name);
4200 else if (r_reloc_get_hash_entry (r_rel))
4201 fprintf (fp, " %s + ", r_reloc_get_hash_entry (r_rel)->root.root.string);
4203 fprintf (fp, " ?? + ");
4205 fprintf_vma (fp, r_rel->target_offset);
4206 if (r_rel->virtual_offset)
4208 fprintf (fp, " + ");
4209 fprintf_vma (fp, r_rel->virtual_offset);
4218 /* source_reloc: relocations that reference literals. */
4220 /* To determine whether literals can be coalesced, we need to first
4221 record all the relocations that reference the literals. The
4222 source_reloc structure below is used for this purpose. The
4223 source_reloc entries are kept in a per-literal-section array, sorted
4224 by offset within the literal section (i.e., target offset).
4226 The source_sec and r_rel.rela.r_offset fields identify the source of
4227 the relocation. The r_rel field records the relocation value, i.e.,
4228 the offset of the literal being referenced. The opnd field is needed
4229 to determine the range of the immediate field to which the relocation
4230 applies, so we can determine whether another literal with the same
4231 value is within range. The is_null field is true when the relocation
4232 is being removed (e.g., when an L32R is being removed due to a CALLX
4233 that is converted to a direct CALL). */
4235 typedef struct source_reloc_struct source_reloc;
4237 struct source_reloc_struct
4239 asection *source_sec;
4241 xtensa_opcode opcode;
4243 bfd_boolean is_null;
4244 bfd_boolean is_abs_literal;
4249 init_source_reloc (source_reloc *reloc,
4250 asection *source_sec,
4251 const r_reloc *r_rel,
4252 xtensa_opcode opcode,
4254 bfd_boolean is_abs_literal)
4256 reloc->source_sec = source_sec;
4257 reloc->r_rel = *r_rel;
4258 reloc->opcode = opcode;
4260 reloc->is_null = FALSE;
4261 reloc->is_abs_literal = is_abs_literal;
4265 /* Find the source_reloc for a particular source offset and relocation
4266 type. Note that the array is sorted by _target_ offset, so this is
4267 just a linear search. */
4269 static source_reloc *
4270 find_source_reloc (source_reloc *src_relocs,
4273 Elf_Internal_Rela *irel)
4277 for (i = 0; i < src_count; i++)
4279 if (src_relocs[i].source_sec == sec
4280 && src_relocs[i].r_rel.rela.r_offset == irel->r_offset
4281 && (ELF32_R_TYPE (src_relocs[i].r_rel.rela.r_info)
4282 == ELF32_R_TYPE (irel->r_info)))
4283 return &src_relocs[i];
4291 source_reloc_compare (const void *ap, const void *bp)
4293 const source_reloc *a = (const source_reloc *) ap;
4294 const source_reloc *b = (const source_reloc *) bp;
4296 if (a->r_rel.target_offset != b->r_rel.target_offset)
4297 return (a->r_rel.target_offset - b->r_rel.target_offset);
4299 /* We don't need to sort on these criteria for correctness,
4300 but enforcing a more strict ordering prevents unstable qsort
4301 from behaving differently with different implementations.
4302 Without the code below we get correct but different results
4303 on Solaris 2.7 and 2.8. We would like to always produce the
4304 same results no matter the host. */
4306 if ((!a->is_null) - (!b->is_null))
4307 return ((!a->is_null) - (!b->is_null));
4308 return internal_reloc_compare (&a->r_rel.rela, &b->r_rel.rela);
4312 /* Literal values and value hash tables. */
4314 /* Literals with the same value can be coalesced. The literal_value
4315 structure records the value of a literal: the "r_rel" field holds the
4316 information from the relocation on the literal (if there is one) and
4317 the "value" field holds the contents of the literal word itself.
4319 The value_map structure records a literal value along with the
4320 location of a literal holding that value. The value_map hash table
4321 is indexed by the literal value, so that we can quickly check if a
4322 particular literal value has been seen before and is thus a candidate
4325 typedef struct literal_value_struct literal_value;
4326 typedef struct value_map_struct value_map;
4327 typedef struct value_map_hash_table_struct value_map_hash_table;
4329 struct literal_value_struct
4332 unsigned long value;
4333 bfd_boolean is_abs_literal;
4336 struct value_map_struct
4338 literal_value val; /* The literal value. */
4339 r_reloc loc; /* Location of the literal. */
4343 struct value_map_hash_table_struct
4345 unsigned bucket_count;
4346 value_map **buckets;
4348 bfd_boolean has_last_loc;
4354 init_literal_value (literal_value *lit,
4355 const r_reloc *r_rel,
4356 unsigned long value,
4357 bfd_boolean is_abs_literal)
4359 lit->r_rel = *r_rel;
4361 lit->is_abs_literal = is_abs_literal;
4366 literal_value_equal (const literal_value *src1,
4367 const literal_value *src2,
4368 bfd_boolean final_static_link)
4370 struct elf_link_hash_entry *h1, *h2;
4372 if (r_reloc_is_const (&src1->r_rel) != r_reloc_is_const (&src2->r_rel))
4375 if (r_reloc_is_const (&src1->r_rel))
4376 return (src1->value == src2->value);
4378 if (ELF32_R_TYPE (src1->r_rel.rela.r_info)
4379 != ELF32_R_TYPE (src2->r_rel.rela.r_info))
4382 if (src1->r_rel.target_offset != src2->r_rel.target_offset)
4385 if (src1->r_rel.virtual_offset != src2->r_rel.virtual_offset)
4388 if (src1->value != src2->value)
4391 /* Now check for the same section (if defined) or the same elf_hash
4392 (if undefined or weak). */
4393 h1 = r_reloc_get_hash_entry (&src1->r_rel);
4394 h2 = r_reloc_get_hash_entry (&src2->r_rel);
4395 if (r_reloc_is_defined (&src1->r_rel)
4396 && (final_static_link
4397 || ((!h1 || h1->root.type != bfd_link_hash_defweak)
4398 && (!h2 || h2->root.type != bfd_link_hash_defweak))))
4400 if (r_reloc_get_section (&src1->r_rel)
4401 != r_reloc_get_section (&src2->r_rel))
4406 /* Require that the hash entries (i.e., symbols) be identical. */
4407 if (h1 != h2 || h1 == 0)
4411 if (src1->is_abs_literal != src2->is_abs_literal)
4418 /* Must be power of 2. */
4419 #define INITIAL_HASH_RELOC_BUCKET_COUNT 1024
4421 static value_map_hash_table *
4422 value_map_hash_table_init (void)
4424 value_map_hash_table *values;
4426 values = (value_map_hash_table *)
4427 bfd_zmalloc (sizeof (value_map_hash_table));
4428 values->bucket_count = INITIAL_HASH_RELOC_BUCKET_COUNT;
4430 values->buckets = (value_map **)
4431 bfd_zmalloc (sizeof (value_map *) * values->bucket_count);
4432 if (values->buckets == NULL)
4437 values->has_last_loc = FALSE;
4444 value_map_hash_table_delete (value_map_hash_table *table)
4446 free (table->buckets);
4452 hash_bfd_vma (bfd_vma val)
4454 return (val >> 2) + (val >> 10);
4459 literal_value_hash (const literal_value *src)
4463 hash_val = hash_bfd_vma (src->value);
4464 if (!r_reloc_is_const (&src->r_rel))
4468 hash_val += hash_bfd_vma (src->is_abs_literal * 1000);
4469 hash_val += hash_bfd_vma (src->r_rel.target_offset);
4470 hash_val += hash_bfd_vma (src->r_rel.virtual_offset);
4472 /* Now check for the same section and the same elf_hash. */
4473 if (r_reloc_is_defined (&src->r_rel))
4474 sec_or_hash = r_reloc_get_section (&src->r_rel);
4476 sec_or_hash = r_reloc_get_hash_entry (&src->r_rel);
4477 hash_val += hash_bfd_vma ((bfd_vma) (size_t) sec_or_hash);
4483 /* Check if the specified literal_value has been seen before. */
4486 value_map_get_cached_value (value_map_hash_table *map,
4487 const literal_value *val,
4488 bfd_boolean final_static_link)
4494 idx = literal_value_hash (val);
4495 idx = idx & (map->bucket_count - 1);
4496 bucket = map->buckets[idx];
4497 for (map_e = bucket; map_e; map_e = map_e->next)
4499 if (literal_value_equal (&map_e->val, val, final_static_link))
4506 /* Record a new literal value. It is illegal to call this if VALUE
4507 already has an entry here. */
4510 add_value_map (value_map_hash_table *map,
4511 const literal_value *val,
4513 bfd_boolean final_static_link)
4515 value_map **bucket_p;
4518 value_map *val_e = (value_map *) bfd_zmalloc (sizeof (value_map));
4521 bfd_set_error (bfd_error_no_memory);
4525 BFD_ASSERT (!value_map_get_cached_value (map, val, final_static_link));
4529 idx = literal_value_hash (val);
4530 idx = idx & (map->bucket_count - 1);
4531 bucket_p = &map->buckets[idx];
4533 val_e->next = *bucket_p;
4536 /* FIXME: Consider resizing the hash table if we get too many entries. */
4542 /* Lists of text actions (ta_) for narrowing, widening, longcall
4543 conversion, space fill, code & literal removal, etc. */
4545 /* The following text actions are generated:
4547 "ta_remove_insn" remove an instruction or instructions
4548 "ta_remove_longcall" convert longcall to call
4549 "ta_convert_longcall" convert longcall to nop/call
4550 "ta_narrow_insn" narrow a wide instruction
4551 "ta_widen" widen a narrow instruction
4552 "ta_fill" add fill or remove fill
4553 removed < 0 is a fill; branches to the fill address will be
4554 changed to address + fill size (e.g., address - removed)
4555 removed >= 0 branches to the fill address will stay unchanged
4556 "ta_remove_literal" remove a literal; this action is
4557 indicated when a literal is removed
4559 "ta_add_literal" insert a new literal; this action is
4560 indicated when a literal has been moved.
4561 It may use a virtual_offset because
4562 multiple literals can be placed at the
4565 For each of these text actions, we also record the number of bytes
4566 removed by performing the text action. In the case of a "ta_widen"
4567 or a "ta_fill" that adds space, the removed_bytes will be negative. */
4569 typedef struct text_action_struct text_action;
4570 typedef struct text_action_list_struct text_action_list;
4571 typedef enum text_action_enum_t text_action_t;
4573 enum text_action_enum_t
4576 ta_remove_insn, /* removed = -size */
4577 ta_remove_longcall, /* removed = -size */
4578 ta_convert_longcall, /* removed = 0 */
4579 ta_narrow_insn, /* removed = -1 */
4580 ta_widen_insn, /* removed = +1 */
4581 ta_fill, /* removed = +size */
4587 /* Structure for a text action record. */
4588 struct text_action_struct
4590 text_action_t action;
4591 asection *sec; /* Optional */
4593 bfd_vma virtual_offset; /* Zero except for adding literals. */
4595 literal_value value; /* Only valid when adding literals. */
4601 /* List of all of the actions taken on a text section. */
4602 struct text_action_list_struct
4608 static text_action *
4609 find_fill_action (text_action_list *l, asection *sec, bfd_vma offset)
4613 /* It is not necessary to fill at the end of a section. */
4614 if (sec->size == offset)
4617 for (m_p = &l->head; *m_p && (*m_p)->offset <= offset; m_p = &(*m_p)->next)
4619 text_action *t = *m_p;
4620 /* When the action is another fill at the same address,
4621 just increase the size. */
4622 if (t->offset == offset && t->action == ta_fill)
4630 compute_removed_action_diff (const text_action *ta,
4634 int removable_space)
4637 int current_removed = 0;
4640 current_removed = ta->removed_bytes;
4642 BFD_ASSERT (ta == NULL || ta->offset == offset);
4643 BFD_ASSERT (ta == NULL || ta->action == ta_fill);
4645 /* It is not necessary to fill at the end of a section. Clean this up. */
4646 if (sec->size == offset)
4647 new_removed = removable_space - 0;
4651 int added = -removed - current_removed;
4652 /* Ignore multiples of the section alignment. */
4653 added = ((1 << sec->alignment_power) - 1) & added;
4654 new_removed = (-added);
4656 /* Modify for removable. */
4657 space = removable_space - new_removed;
4658 new_removed = (removable_space
4659 - (((1 << sec->alignment_power) - 1) & space));
4661 return (new_removed - current_removed);
4666 adjust_fill_action (text_action *ta, int fill_diff)
4668 ta->removed_bytes += fill_diff;
4672 /* Add a modification action to the text. For the case of adding or
4673 removing space, modify any current fill and assume that
4674 "unreachable_space" bytes can be freely contracted. Note that a
4675 negative removed value is a fill. */
4678 text_action_add (text_action_list *l,
4679 text_action_t action,
4687 /* It is not necessary to fill at the end of a section. */
4688 if (action == ta_fill && sec->size == offset)
4691 /* It is not necessary to fill 0 bytes. */
4692 if (action == ta_fill && removed == 0)
4695 for (m_p = &l->head; *m_p && (*m_p)->offset <= offset; m_p = &(*m_p)->next)
4697 text_action *t = *m_p;
4698 /* When the action is another fill at the same address,
4699 just increase the size. */
4700 if (t->offset == offset && t->action == ta_fill && action == ta_fill)
4702 t->removed_bytes += removed;
4707 /* Create a new record and fill it up. */
4708 ta = (text_action *) bfd_zmalloc (sizeof (text_action));
4709 ta->action = action;
4711 ta->offset = offset;
4712 ta->removed_bytes = removed;
4719 text_action_add_literal (text_action_list *l,
4720 text_action_t action,
4722 const literal_value *value,
4727 asection *sec = r_reloc_get_section (loc);
4728 bfd_vma offset = loc->target_offset;
4729 bfd_vma virtual_offset = loc->virtual_offset;
4731 BFD_ASSERT (action == ta_add_literal);
4733 for (m_p = &l->head; *m_p != NULL; m_p = &(*m_p)->next)
4735 if ((*m_p)->offset > offset
4736 && ((*m_p)->offset != offset
4737 || (*m_p)->virtual_offset > virtual_offset))
4741 /* Create a new record and fill it up. */
4742 ta = (text_action *) bfd_zmalloc (sizeof (text_action));
4743 ta->action = action;
4745 ta->offset = offset;
4746 ta->virtual_offset = virtual_offset;
4748 ta->removed_bytes = removed;
4755 offset_with_removed_text (text_action_list *action_list, bfd_vma offset)
4760 for (r = action_list->head; r && r->offset <= offset; r = r->next)
4762 if (r->offset < offset
4763 || (r->action == ta_fill && r->removed_bytes < 0))
4764 removed += r->removed_bytes;
4767 return (offset - removed);
4772 action_list_count (text_action_list *action_list)
4774 text_action *r = action_list->head;
4776 for (r = action_list->head; r != NULL; r = r->next)
4785 offset_with_removed_text_before_fill (text_action_list *action_list,
4791 for (r = action_list->head; r && r->offset < offset; r = r->next)
4792 removed += r->removed_bytes;
4794 return (offset - removed);
4798 /* The find_insn_action routine will only find non-fill actions. */
4800 static text_action *
4801 find_insn_action (text_action_list *action_list, bfd_vma offset)
4804 for (t = action_list->head; t; t = t->next)
4806 if (t->offset == offset)
4813 case ta_remove_insn:
4814 case ta_remove_longcall:
4815 case ta_convert_longcall:
4816 case ta_narrow_insn:
4819 case ta_remove_literal:
4820 case ta_add_literal:
4833 print_action_list (FILE *fp, text_action_list *action_list)
4837 fprintf (fp, "Text Action\n");
4838 for (r = action_list->head; r != NULL; r = r->next)
4840 const char *t = "unknown";
4843 case ta_remove_insn:
4844 t = "remove_insn"; break;
4845 case ta_remove_longcall:
4846 t = "remove_longcall"; break;
4847 case ta_convert_longcall:
4848 t = "remove_longcall"; break;
4849 case ta_narrow_insn:
4850 t = "narrow_insn"; break;
4852 t = "widen_insn"; break;
4857 case ta_remove_literal:
4858 t = "remove_literal"; break;
4859 case ta_add_literal:
4860 t = "add_literal"; break;
4863 fprintf (fp, "%s: %s[0x%lx] \"%s\" %d\n",
4864 r->sec->owner->filename,
4865 r->sec->name, r->offset, t, r->removed_bytes);
4872 /* Lists of literals being coalesced or removed. */
4874 /* In the usual case, the literal identified by "from" is being
4875 coalesced with another literal identified by "to". If the literal is
4876 unused and is being removed altogether, "to.abfd" will be NULL.
4877 The removed_literal entries are kept on a per-section list, sorted
4878 by the "from" offset field. */
4880 typedef struct removed_literal_struct removed_literal;
4881 typedef struct removed_literal_list_struct removed_literal_list;
4883 struct removed_literal_struct
4887 removed_literal *next;
4890 struct removed_literal_list_struct
4892 removed_literal *head;
4893 removed_literal *tail;
4897 /* Record that the literal at "from" is being removed. If "to" is not
4898 NULL, the "from" literal is being coalesced with the "to" literal. */
4901 add_removed_literal (removed_literal_list *removed_list,
4902 const r_reloc *from,
4905 removed_literal *r, *new_r, *next_r;
4907 new_r = (removed_literal *) bfd_zmalloc (sizeof (removed_literal));
4909 new_r->from = *from;
4913 new_r->to.abfd = NULL;
4916 r = removed_list->head;
4919 removed_list->head = new_r;
4920 removed_list->tail = new_r;
4922 /* Special check for common case of append. */
4923 else if (removed_list->tail->from.target_offset < from->target_offset)
4925 removed_list->tail->next = new_r;
4926 removed_list->tail = new_r;
4930 while (r->from.target_offset < from->target_offset && r->next)
4936 new_r->next = next_r;
4938 removed_list->tail = new_r;
4943 /* Check if the list of removed literals contains an entry for the
4944 given address. Return the entry if found. */
4946 static removed_literal *
4947 find_removed_literal (removed_literal_list *removed_list, bfd_vma addr)
4949 removed_literal *r = removed_list->head;
4950 while (r && r->from.target_offset < addr)
4952 if (r && r->from.target_offset == addr)
4961 print_removed_literals (FILE *fp, removed_literal_list *removed_list)
4964 r = removed_list->head;
4966 fprintf (fp, "Removed Literals\n");
4967 for (; r != NULL; r = r->next)
4969 print_r_reloc (fp, &r->from);
4970 fprintf (fp, " => ");
4971 if (r->to.abfd == NULL)
4972 fprintf (fp, "REMOVED");
4974 print_r_reloc (fp, &r->to);
4982 /* Per-section data for relaxation. */
4984 typedef struct reloc_bfd_fix_struct reloc_bfd_fix;
4986 struct xtensa_relax_info_struct
4988 bfd_boolean is_relaxable_literal_section;
4989 bfd_boolean is_relaxable_asm_section;
4990 int visited; /* Number of times visited. */
4992 source_reloc *src_relocs; /* Array[src_count]. */
4994 int src_next; /* Next src_relocs entry to assign. */
4996 removed_literal_list removed_list;
4997 text_action_list action_list;
4999 reloc_bfd_fix *fix_list;
5000 reloc_bfd_fix *fix_array;
5001 unsigned fix_array_count;
5003 /* Support for expanding the reloc array that is stored
5004 in the section structure. If the relocations have been
5005 reallocated, the newly allocated relocations will be referenced
5006 here along with the actual size allocated. The relocation
5007 count will always be found in the section structure. */
5008 Elf_Internal_Rela *allocated_relocs;
5009 unsigned relocs_count;
5010 unsigned allocated_relocs_count;
5013 struct elf_xtensa_section_data
5015 struct bfd_elf_section_data elf;
5016 xtensa_relax_info relax_info;
5021 elf_xtensa_new_section_hook (bfd *abfd, asection *sec)
5023 if (!sec->used_by_bfd)
5025 struct elf_xtensa_section_data *sdata;
5026 bfd_size_type amt = sizeof (*sdata);
5028 sdata = bfd_zalloc (abfd, amt);
5031 sec->used_by_bfd = sdata;
5034 return _bfd_elf_new_section_hook (abfd, sec);
5038 static xtensa_relax_info *
5039 get_xtensa_relax_info (asection *sec)
5041 struct elf_xtensa_section_data *section_data;
5043 /* No info available if no section or if it is an output section. */
5044 if (!sec || sec == sec->output_section)
5047 section_data = (struct elf_xtensa_section_data *) elf_section_data (sec);
5048 return §ion_data->relax_info;
5053 init_xtensa_relax_info (asection *sec)
5055 xtensa_relax_info *relax_info = get_xtensa_relax_info (sec);
5057 relax_info->is_relaxable_literal_section = FALSE;
5058 relax_info->is_relaxable_asm_section = FALSE;
5059 relax_info->visited = 0;
5061 relax_info->src_relocs = NULL;
5062 relax_info->src_count = 0;
5063 relax_info->src_next = 0;
5065 relax_info->removed_list.head = NULL;
5066 relax_info->removed_list.tail = NULL;
5068 relax_info->action_list.head = NULL;
5070 relax_info->fix_list = NULL;
5071 relax_info->fix_array = NULL;
5072 relax_info->fix_array_count = 0;
5074 relax_info->allocated_relocs = NULL;
5075 relax_info->relocs_count = 0;
5076 relax_info->allocated_relocs_count = 0;
5080 /* Coalescing literals may require a relocation to refer to a section in
5081 a different input file, but the standard relocation information
5082 cannot express that. Instead, the reloc_bfd_fix structures are used
5083 to "fix" the relocations that refer to sections in other input files.
5084 These structures are kept on per-section lists. The "src_type" field
5085 records the relocation type in case there are multiple relocations on
5086 the same location. FIXME: This is ugly; an alternative might be to
5087 add new symbols with the "owner" field to some other input file. */
5089 struct reloc_bfd_fix_struct
5093 unsigned src_type; /* Relocation type. */
5096 asection *target_sec;
5097 bfd_vma target_offset;
5098 bfd_boolean translated;
5100 reloc_bfd_fix *next;
5104 static reloc_bfd_fix *
5105 reloc_bfd_fix_init (asection *src_sec,
5109 asection *target_sec,
5110 bfd_vma target_offset,
5111 bfd_boolean translated)
5115 fix = (reloc_bfd_fix *) bfd_malloc (sizeof (reloc_bfd_fix));
5116 fix->src_sec = src_sec;
5117 fix->src_offset = src_offset;
5118 fix->src_type = src_type;
5119 fix->target_abfd = target_abfd;
5120 fix->target_sec = target_sec;
5121 fix->target_offset = target_offset;
5122 fix->translated = translated;
5129 add_fix (asection *src_sec, reloc_bfd_fix *fix)
5131 xtensa_relax_info *relax_info;
5133 relax_info = get_xtensa_relax_info (src_sec);
5134 fix->next = relax_info->fix_list;
5135 relax_info->fix_list = fix;
5140 fix_compare (const void *ap, const void *bp)
5142 const reloc_bfd_fix *a = (const reloc_bfd_fix *) ap;
5143 const reloc_bfd_fix *b = (const reloc_bfd_fix *) bp;
5145 if (a->src_offset != b->src_offset)
5146 return (a->src_offset - b->src_offset);
5147 return (a->src_type - b->src_type);
5152 cache_fix_array (asection *sec)
5154 unsigned i, count = 0;
5156 xtensa_relax_info *relax_info = get_xtensa_relax_info (sec);
5158 if (relax_info == NULL)
5160 if (relax_info->fix_list == NULL)
5163 for (r = relax_info->fix_list; r != NULL; r = r->next)
5166 relax_info->fix_array =
5167 (reloc_bfd_fix *) bfd_malloc (sizeof (reloc_bfd_fix) * count);
5168 relax_info->fix_array_count = count;
5170 r = relax_info->fix_list;
5171 for (i = 0; i < count; i++, r = r->next)
5173 relax_info->fix_array[count - 1 - i] = *r;
5174 relax_info->fix_array[count - 1 - i].next = NULL;
5177 qsort (relax_info->fix_array, relax_info->fix_array_count,
5178 sizeof (reloc_bfd_fix), fix_compare);
5182 static reloc_bfd_fix *
5183 get_bfd_fix (asection *sec, bfd_vma offset, unsigned type)
5185 xtensa_relax_info *relax_info = get_xtensa_relax_info (sec);
5189 if (relax_info == NULL)
5191 if (relax_info->fix_list == NULL)
5194 if (relax_info->fix_array == NULL)
5195 cache_fix_array (sec);
5197 key.src_offset = offset;
5198 key.src_type = type;
5199 rv = bsearch (&key, relax_info->fix_array, relax_info->fix_array_count,
5200 sizeof (reloc_bfd_fix), fix_compare);
5205 /* Section caching. */
5207 typedef struct section_cache_struct section_cache_t;
5209 struct section_cache_struct
5213 bfd_byte *contents; /* Cache of the section contents. */
5214 bfd_size_type content_length;
5216 property_table_entry *ptbl; /* Cache of the section property table. */
5219 Elf_Internal_Rela *relocs; /* Cache of the section relocations. */
5220 unsigned reloc_count;
5225 init_section_cache (section_cache_t *sec_cache)
5227 memset (sec_cache, 0, sizeof (*sec_cache));
5232 clear_section_cache (section_cache_t *sec_cache)
5236 release_contents (sec_cache->sec, sec_cache->contents);
5237 release_internal_relocs (sec_cache->sec, sec_cache->relocs);
5238 if (sec_cache->ptbl)
5239 free (sec_cache->ptbl);
5240 memset (sec_cache, 0, sizeof (sec_cache));
5246 section_cache_section (section_cache_t *sec_cache,
5248 struct bfd_link_info *link_info)
5251 property_table_entry *prop_table = NULL;
5253 bfd_byte *contents = NULL;
5254 Elf_Internal_Rela *internal_relocs = NULL;
5255 bfd_size_type sec_size;
5259 if (sec == sec_cache->sec)
5263 sec_size = bfd_get_section_limit (abfd, sec);
5265 /* Get the contents. */
5266 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
5267 if (contents == NULL && sec_size != 0)
5270 /* Get the relocations. */
5271 internal_relocs = retrieve_internal_relocs (abfd, sec,
5272 link_info->keep_memory);
5274 /* Get the entry table. */
5275 ptblsize = xtensa_read_table_entries (abfd, sec, &prop_table,
5276 XTENSA_PROP_SEC_NAME, FALSE);
5280 /* Fill in the new section cache. */
5281 clear_section_cache (sec_cache);
5282 memset (sec_cache, 0, sizeof (sec_cache));
5284 sec_cache->sec = sec;
5285 sec_cache->contents = contents;
5286 sec_cache->content_length = sec_size;
5287 sec_cache->relocs = internal_relocs;
5288 sec_cache->reloc_count = sec->reloc_count;
5289 sec_cache->pte_count = ptblsize;
5290 sec_cache->ptbl = prop_table;
5295 release_contents (sec, contents);
5296 release_internal_relocs (sec, internal_relocs);
5303 /* Extended basic blocks. */
5305 /* An ebb_struct represents an Extended Basic Block. Within this
5306 range, we guarantee that all instructions are decodable, the
5307 property table entries are contiguous, and no property table
5308 specifies a segment that cannot have instructions moved. This
5309 structure contains caches of the contents, property table and
5310 relocations for the specified section for easy use. The range is
5311 specified by ranges of indices for the byte offset, property table
5312 offsets and relocation offsets. These must be consistent. */
5314 typedef struct ebb_struct ebb_t;
5320 bfd_byte *contents; /* Cache of the section contents. */
5321 bfd_size_type content_length;
5323 property_table_entry *ptbl; /* Cache of the section property table. */
5326 Elf_Internal_Rela *relocs; /* Cache of the section relocations. */
5327 unsigned reloc_count;
5329 bfd_vma start_offset; /* Offset in section. */
5330 unsigned start_ptbl_idx; /* Offset in the property table. */
5331 unsigned start_reloc_idx; /* Offset in the relocations. */
5334 unsigned end_ptbl_idx;
5335 unsigned end_reloc_idx;
5337 bfd_boolean ends_section; /* Is this the last ebb in a section? */
5339 /* The unreachable property table at the end of this set of blocks;
5340 NULL if the end is not an unreachable block. */
5341 property_table_entry *ends_unreachable;
5345 enum ebb_target_enum
5348 EBB_DESIRE_TGT_ALIGN,
5349 EBB_REQUIRE_TGT_ALIGN,
5350 EBB_REQUIRE_LOOP_ALIGN,
5355 /* proposed_action_struct is similar to the text_action_struct except
5356 that is represents a potential transformation, not one that will
5357 occur. We build a list of these for an extended basic block
5358 and use them to compute the actual actions desired. We must be
5359 careful that the entire set of actual actions we perform do not
5360 break any relocations that would fit if the actions were not
5363 typedef struct proposed_action_struct proposed_action;
5365 struct proposed_action_struct
5367 enum ebb_target_enum align_type; /* for the target alignment */
5368 bfd_vma alignment_pow;
5369 text_action_t action;
5372 bfd_boolean do_action; /* If false, then we will not perform the action. */
5376 /* The ebb_constraint_struct keeps a set of proposed actions for an
5377 extended basic block. */
5379 typedef struct ebb_constraint_struct ebb_constraint;
5381 struct ebb_constraint_struct
5384 bfd_boolean start_movable;
5386 /* Bytes of extra space at the beginning if movable. */
5387 int start_extra_space;
5389 enum ebb_target_enum start_align;
5391 bfd_boolean end_movable;
5393 /* Bytes of extra space at the end if movable. */
5394 int end_extra_space;
5396 unsigned action_count;
5397 unsigned action_allocated;
5399 /* Array of proposed actions. */
5400 proposed_action *actions;
5402 /* Action alignments -- one for each proposed action. */
5403 enum ebb_target_enum *action_aligns;
5408 init_ebb_constraint (ebb_constraint *c)
5410 memset (c, 0, sizeof (ebb_constraint));
5415 free_ebb_constraint (ebb_constraint *c)
5423 init_ebb (ebb_t *ebb,
5426 bfd_size_type content_length,
5427 property_table_entry *prop_table,
5429 Elf_Internal_Rela *internal_relocs,
5430 unsigned reloc_count)
5432 memset (ebb, 0, sizeof (ebb_t));
5434 ebb->contents = contents;
5435 ebb->content_length = content_length;
5436 ebb->ptbl = prop_table;
5437 ebb->pte_count = ptblsize;
5438 ebb->relocs = internal_relocs;
5439 ebb->reloc_count = reloc_count;
5440 ebb->start_offset = 0;
5441 ebb->end_offset = ebb->content_length - 1;
5442 ebb->start_ptbl_idx = 0;
5443 ebb->end_ptbl_idx = ptblsize;
5444 ebb->start_reloc_idx = 0;
5445 ebb->end_reloc_idx = reloc_count;
5449 /* Extend the ebb to all decodable contiguous sections. The algorithm
5450 for building a basic block around an instruction is to push it
5451 forward until we hit the end of a section, an unreachable block or
5452 a block that cannot be transformed. Then we push it backwards
5453 searching for similar conditions. */
5455 static bfd_boolean extend_ebb_bounds_forward (ebb_t *);
5456 static bfd_boolean extend_ebb_bounds_backward (ebb_t *);
5457 static bfd_size_type insn_block_decodable_len
5458 (bfd_byte *, bfd_size_type, bfd_vma, bfd_size_type);
5461 extend_ebb_bounds (ebb_t *ebb)
5463 if (!extend_ebb_bounds_forward (ebb))
5465 if (!extend_ebb_bounds_backward (ebb))
5472 extend_ebb_bounds_forward (ebb_t *ebb)
5474 property_table_entry *the_entry, *new_entry;
5476 the_entry = &ebb->ptbl[ebb->end_ptbl_idx];
5478 /* Stop when (1) we cannot decode an instruction, (2) we are at
5479 the end of the property tables, (3) we hit a non-contiguous property
5480 table entry, (4) we hit a NO_TRANSFORM region. */
5485 bfd_size_type insn_block_len;
5487 entry_end = the_entry->address - ebb->sec->vma + the_entry->size;
5489 insn_block_decodable_len (ebb->contents, ebb->content_length,
5491 entry_end - ebb->end_offset);
5492 if (insn_block_len != (entry_end - ebb->end_offset))
5494 (*_bfd_error_handler)
5495 (_("%B(%A+0x%lx): could not decode instruction; possible configuration mismatch"),
5496 ebb->sec->owner, ebb->sec, ebb->end_offset + insn_block_len);
5499 ebb->end_offset += insn_block_len;
5501 if (ebb->end_offset == ebb->sec->size)
5502 ebb->ends_section = TRUE;
5504 /* Update the reloc counter. */
5505 while (ebb->end_reloc_idx + 1 < ebb->reloc_count
5506 && (ebb->relocs[ebb->end_reloc_idx + 1].r_offset
5509 ebb->end_reloc_idx++;
5512 if (ebb->end_ptbl_idx + 1 == ebb->pte_count)
5515 new_entry = &ebb->ptbl[ebb->end_ptbl_idx + 1];
5516 if (((new_entry->flags & XTENSA_PROP_INSN) == 0)
5517 || ((new_entry->flags & XTENSA_PROP_INSN_NO_TRANSFORM) != 0)
5518 || ((the_entry->flags & XTENSA_PROP_ALIGN) != 0))
5521 if (the_entry->address + the_entry->size != new_entry->address)
5524 the_entry = new_entry;
5525 ebb->end_ptbl_idx++;
5528 /* Quick check for an unreachable or end of file just at the end. */
5529 if (ebb->end_ptbl_idx + 1 == ebb->pte_count)
5531 if (ebb->end_offset == ebb->content_length)
5532 ebb->ends_section = TRUE;
5536 new_entry = &ebb->ptbl[ebb->end_ptbl_idx + 1];
5537 if ((new_entry->flags & XTENSA_PROP_UNREACHABLE) != 0
5538 && the_entry->address + the_entry->size == new_entry->address)
5539 ebb->ends_unreachable = new_entry;
5542 /* Any other ending requires exact alignment. */
5548 extend_ebb_bounds_backward (ebb_t *ebb)
5550 property_table_entry *the_entry, *new_entry;
5552 the_entry = &ebb->ptbl[ebb->start_ptbl_idx];
5554 /* Stop when (1) we cannot decode the instructions in the current entry.
5555 (2) we are at the beginning of the property tables, (3) we hit a
5556 non-contiguous property table entry, (4) we hit a NO_TRANSFORM region. */
5560 bfd_vma block_begin;
5561 bfd_size_type insn_block_len;
5563 block_begin = the_entry->address - ebb->sec->vma;
5565 insn_block_decodable_len (ebb->contents, ebb->content_length,
5567 ebb->start_offset - block_begin);
5568 if (insn_block_len != ebb->start_offset - block_begin)
5570 (*_bfd_error_handler)
5571 (_("%B(%A+0x%lx): could not decode instruction; possible configuration mismatch"),
5572 ebb->sec->owner, ebb->sec, ebb->end_offset + insn_block_len);
5575 ebb->start_offset -= insn_block_len;
5577 /* Update the reloc counter. */
5578 while (ebb->start_reloc_idx > 0
5579 && (ebb->relocs[ebb->start_reloc_idx - 1].r_offset
5580 >= ebb->start_offset))
5582 ebb->start_reloc_idx--;
5585 if (ebb->start_ptbl_idx == 0)
5588 new_entry = &ebb->ptbl[ebb->start_ptbl_idx - 1];
5589 if ((new_entry->flags & XTENSA_PROP_INSN) == 0
5590 || ((new_entry->flags & XTENSA_PROP_INSN_NO_TRANSFORM) != 0)
5591 || ((new_entry->flags & XTENSA_PROP_ALIGN) != 0))
5593 if (new_entry->address + new_entry->size != the_entry->address)
5596 the_entry = new_entry;
5597 ebb->start_ptbl_idx--;
5603 static bfd_size_type
5604 insn_block_decodable_len (bfd_byte *contents,
5605 bfd_size_type content_len,
5606 bfd_vma block_offset,
5607 bfd_size_type block_len)
5609 bfd_vma offset = block_offset;
5611 while (offset < block_offset + block_len)
5613 bfd_size_type insn_len = 0;
5615 insn_len = insn_decode_len (contents, content_len, offset);
5617 return (offset - block_offset);
5620 return (offset - block_offset);
5625 ebb_propose_action (ebb_constraint *c,
5626 enum ebb_target_enum align_type,
5627 bfd_vma alignment_pow,
5628 text_action_t action,
5631 bfd_boolean do_action)
5633 proposed_action *act;
5635 if (c->action_allocated <= c->action_count)
5637 unsigned new_allocated, i;
5638 proposed_action *new_actions;
5640 new_allocated = (c->action_count + 2) * 2;
5641 new_actions = (proposed_action *)
5642 bfd_zmalloc (sizeof (proposed_action) * new_allocated);
5644 for (i = 0; i < c->action_count; i++)
5645 new_actions[i] = c->actions[i];
5648 c->actions = new_actions;
5649 c->action_allocated = new_allocated;
5652 act = &c->actions[c->action_count];
5653 act->align_type = align_type;
5654 act->alignment_pow = alignment_pow;
5655 act->action = action;
5656 act->offset = offset;
5657 act->removed_bytes = removed_bytes;
5658 act->do_action = do_action;
5664 /* Access to internal relocations, section contents and symbols. */
5666 /* During relaxation, we need to modify relocations, section contents,
5667 and symbol definitions, and we need to keep the original values from
5668 being reloaded from the input files, i.e., we need to "pin" the
5669 modified values in memory. We also want to continue to observe the
5670 setting of the "keep-memory" flag. The following functions wrap the
5671 standard BFD functions to take care of this for us. */
5673 static Elf_Internal_Rela *
5674 retrieve_internal_relocs (bfd *abfd, asection *sec, bfd_boolean keep_memory)
5676 Elf_Internal_Rela *internal_relocs;
5678 if ((sec->flags & SEC_LINKER_CREATED) != 0)
5681 internal_relocs = elf_section_data (sec)->relocs;
5682 if (internal_relocs == NULL)
5683 internal_relocs = (_bfd_elf_link_read_relocs
5684 (abfd, sec, NULL, NULL, keep_memory));
5685 return internal_relocs;
5690 pin_internal_relocs (asection *sec, Elf_Internal_Rela *internal_relocs)
5692 elf_section_data (sec)->relocs = internal_relocs;
5697 release_internal_relocs (asection *sec, Elf_Internal_Rela *internal_relocs)
5700 && elf_section_data (sec)->relocs != internal_relocs)
5701 free (internal_relocs);
5706 retrieve_contents (bfd *abfd, asection *sec, bfd_boolean keep_memory)
5709 bfd_size_type sec_size;
5711 sec_size = bfd_get_section_limit (abfd, sec);
5712 contents = elf_section_data (sec)->this_hdr.contents;
5714 if (contents == NULL && sec_size != 0)
5716 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
5723 elf_section_data (sec)->this_hdr.contents = contents;
5730 pin_contents (asection *sec, bfd_byte *contents)
5732 elf_section_data (sec)->this_hdr.contents = contents;
5737 release_contents (asection *sec, bfd_byte *contents)
5739 if (contents && elf_section_data (sec)->this_hdr.contents != contents)
5744 static Elf_Internal_Sym *
5745 retrieve_local_syms (bfd *input_bfd)
5747 Elf_Internal_Shdr *symtab_hdr;
5748 Elf_Internal_Sym *isymbuf;
5751 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
5752 locsymcount = symtab_hdr->sh_info;
5754 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
5755 if (isymbuf == NULL && locsymcount != 0)
5756 isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, locsymcount, 0,
5759 /* Save the symbols for this input file so they won't be read again. */
5760 if (isymbuf && isymbuf != (Elf_Internal_Sym *) symtab_hdr->contents)
5761 symtab_hdr->contents = (unsigned char *) isymbuf;
5767 /* Code for link-time relaxation. */
5769 /* Initialization for relaxation: */
5770 static bfd_boolean analyze_relocations (struct bfd_link_info *);
5771 static bfd_boolean find_relaxable_sections
5772 (bfd *, asection *, struct bfd_link_info *, bfd_boolean *);
5773 static bfd_boolean collect_source_relocs
5774 (bfd *, asection *, struct bfd_link_info *);
5775 static bfd_boolean is_resolvable_asm_expansion
5776 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, struct bfd_link_info *,
5778 static Elf_Internal_Rela *find_associated_l32r_irel
5779 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, Elf_Internal_Rela *);
5780 static bfd_boolean compute_text_actions
5781 (bfd *, asection *, struct bfd_link_info *);
5782 static bfd_boolean compute_ebb_proposed_actions (ebb_constraint *);
5783 static bfd_boolean compute_ebb_actions (ebb_constraint *);
5784 static bfd_boolean check_section_ebb_pcrels_fit
5785 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, const ebb_constraint *,
5786 const xtensa_opcode *);
5787 static bfd_boolean check_section_ebb_reduces (const ebb_constraint *);
5788 static void text_action_add_proposed
5789 (text_action_list *, const ebb_constraint *, asection *);
5790 static int compute_fill_extra_space (property_table_entry *);
5793 static bfd_boolean compute_removed_literals
5794 (bfd *, asection *, struct bfd_link_info *, value_map_hash_table *);
5795 static Elf_Internal_Rela *get_irel_at_offset
5796 (asection *, Elf_Internal_Rela *, bfd_vma);
5797 static bfd_boolean is_removable_literal
5798 (const source_reloc *, int, const source_reloc *, int);
5799 static bfd_boolean remove_dead_literal
5800 (bfd *, asection *, struct bfd_link_info *, Elf_Internal_Rela *,
5801 Elf_Internal_Rela *, source_reloc *, property_table_entry *, int);
5802 static bfd_boolean identify_literal_placement
5803 (bfd *, asection *, bfd_byte *, struct bfd_link_info *,
5804 value_map_hash_table *, bfd_boolean *, Elf_Internal_Rela *, int,
5805 source_reloc *, property_table_entry *, int, section_cache_t *,
5807 static bfd_boolean relocations_reach (source_reloc *, int, const r_reloc *);
5808 static bfd_boolean coalesce_shared_literal
5809 (asection *, source_reloc *, property_table_entry *, int, value_map *);
5810 static bfd_boolean move_shared_literal
5811 (asection *, struct bfd_link_info *, source_reloc *, property_table_entry *,
5812 int, const r_reloc *, const literal_value *, section_cache_t *);
5815 static bfd_boolean relax_section (bfd *, asection *, struct bfd_link_info *);
5816 static bfd_boolean translate_section_fixes (asection *);
5817 static bfd_boolean translate_reloc_bfd_fix (reloc_bfd_fix *);
5818 static void translate_reloc (const r_reloc *, r_reloc *);
5819 static void shrink_dynamic_reloc_sections
5820 (struct bfd_link_info *, bfd *, asection *, Elf_Internal_Rela *);
5821 static bfd_boolean move_literal
5822 (bfd *, struct bfd_link_info *, asection *, bfd_vma, bfd_byte *,
5823 xtensa_relax_info *, Elf_Internal_Rela **, const literal_value *);
5824 static bfd_boolean relax_property_section
5825 (bfd *, asection *, struct bfd_link_info *);
5828 static bfd_boolean relax_section_symbols (bfd *, asection *);
5832 elf_xtensa_relax_section (bfd *abfd,
5834 struct bfd_link_info *link_info,
5837 static value_map_hash_table *values = NULL;
5838 static bfd_boolean relocations_analyzed = FALSE;
5839 xtensa_relax_info *relax_info;
5841 if (!relocations_analyzed)
5843 /* Do some overall initialization for relaxation. */
5844 values = value_map_hash_table_init ();
5847 relaxing_section = TRUE;
5848 if (!analyze_relocations (link_info))
5850 relocations_analyzed = TRUE;
5854 /* Don't mess with linker-created sections. */
5855 if ((sec->flags & SEC_LINKER_CREATED) != 0)
5858 relax_info = get_xtensa_relax_info (sec);
5859 BFD_ASSERT (relax_info != NULL);
5861 switch (relax_info->visited)
5864 /* Note: It would be nice to fold this pass into
5865 analyze_relocations, but it is important for this step that the
5866 sections be examined in link order. */
5867 if (!compute_removed_literals (abfd, sec, link_info, values))
5874 value_map_hash_table_delete (values);
5876 if (!relax_section (abfd, sec, link_info))
5882 if (!relax_section_symbols (abfd, sec))
5887 relax_info->visited++;
5892 /* Initialization for relaxation. */
5894 /* This function is called once at the start of relaxation. It scans
5895 all the input sections and marks the ones that are relaxable (i.e.,
5896 literal sections with L32R relocations against them), and then
5897 collects source_reloc information for all the relocations against
5898 those relaxable sections. During this process, it also detects
5899 longcalls, i.e., calls relaxed by the assembler into indirect
5900 calls, that can be optimized back into direct calls. Within each
5901 extended basic block (ebb) containing an optimized longcall, it
5902 computes a set of "text actions" that can be performed to remove
5903 the L32R associated with the longcall while optionally preserving
5904 branch target alignments. */
5907 analyze_relocations (struct bfd_link_info *link_info)
5911 bfd_boolean is_relaxable = FALSE;
5913 /* Initialize the per-section relaxation info. */
5914 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next)
5915 for (sec = abfd->sections; sec != NULL; sec = sec->next)
5917 init_xtensa_relax_info (sec);
5920 /* Mark relaxable sections (and count relocations against each one). */
5921 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next)
5922 for (sec = abfd->sections; sec != NULL; sec = sec->next)
5924 if (!find_relaxable_sections (abfd, sec, link_info, &is_relaxable))
5928 /* Bail out if there are no relaxable sections. */
5932 /* Allocate space for source_relocs. */
5933 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next)
5934 for (sec = abfd->sections; sec != NULL; sec = sec->next)
5936 xtensa_relax_info *relax_info;
5938 relax_info = get_xtensa_relax_info (sec);
5939 if (relax_info->is_relaxable_literal_section
5940 || relax_info->is_relaxable_asm_section)
5942 relax_info->src_relocs = (source_reloc *)
5943 bfd_malloc (relax_info->src_count * sizeof (source_reloc));
5947 /* Collect info on relocations against each relaxable section. */
5948 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next)
5949 for (sec = abfd->sections; sec != NULL; sec = sec->next)
5951 if (!collect_source_relocs (abfd, sec, link_info))
5955 /* Compute the text actions. */
5956 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next)
5957 for (sec = abfd->sections; sec != NULL; sec = sec->next)
5959 if (!compute_text_actions (abfd, sec, link_info))
5967 /* Find all the sections that might be relaxed. The motivation for
5968 this pass is that collect_source_relocs() needs to record _all_ the
5969 relocations that target each relaxable section. That is expensive
5970 and unnecessary unless the target section is actually going to be
5971 relaxed. This pass identifies all such sections by checking if
5972 they have L32Rs pointing to them. In the process, the total number
5973 of relocations targeting each section is also counted so that we
5974 know how much space to allocate for source_relocs against each
5975 relaxable literal section. */
5978 find_relaxable_sections (bfd *abfd,
5980 struct bfd_link_info *link_info,
5981 bfd_boolean *is_relaxable_p)
5983 Elf_Internal_Rela *internal_relocs;
5985 bfd_boolean ok = TRUE;
5987 xtensa_relax_info *source_relax_info;
5989 internal_relocs = retrieve_internal_relocs (abfd, sec,
5990 link_info->keep_memory);
5991 if (internal_relocs == NULL)
5994 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
5995 if (contents == NULL && sec->size != 0)
6001 source_relax_info = get_xtensa_relax_info (sec);
6002 for (i = 0; i < sec->reloc_count; i++)
6004 Elf_Internal_Rela *irel = &internal_relocs[i];
6006 asection *target_sec;
6007 xtensa_relax_info *target_relax_info;
6009 /* If this section has not already been marked as "relaxable", and
6010 if it contains any ASM_EXPAND relocations (marking expanded
6011 longcalls) that can be optimized into direct calls, then mark
6012 the section as "relaxable". */
6013 if (source_relax_info
6014 && !source_relax_info->is_relaxable_asm_section
6015 && ELF32_R_TYPE (irel->r_info) == R_XTENSA_ASM_EXPAND)
6017 bfd_boolean is_reachable = FALSE;
6018 if (is_resolvable_asm_expansion (abfd, sec, contents, irel,
6019 link_info, &is_reachable)
6022 source_relax_info->is_relaxable_asm_section = TRUE;
6023 *is_relaxable_p = TRUE;
6027 r_reloc_init (&r_rel, abfd, irel, contents,
6028 bfd_get_section_limit (abfd, sec));
6030 target_sec = r_reloc_get_section (&r_rel);
6031 target_relax_info = get_xtensa_relax_info (target_sec);
6032 if (!target_relax_info)
6035 /* Count PC-relative operand relocations against the target section.
6036 Note: The conditions tested here must match the conditions under
6037 which init_source_reloc is called in collect_source_relocs(). */
6038 if (is_operand_relocation (ELF32_R_TYPE (irel->r_info))
6039 && (!is_alt_relocation (ELF32_R_TYPE (irel->r_info))
6040 || is_l32r_relocation (abfd, sec, contents, irel)))
6041 target_relax_info->src_count++;
6043 if (is_l32r_relocation (abfd, sec, contents, irel)
6044 && r_reloc_is_defined (&r_rel))
6046 /* Mark the target section as relaxable. */
6047 target_relax_info->is_relaxable_literal_section = TRUE;
6048 *is_relaxable_p = TRUE;
6053 release_contents (sec, contents);
6054 release_internal_relocs (sec, internal_relocs);
6059 /* Record _all_ the relocations that point to relaxable sections, and
6060 get rid of ASM_EXPAND relocs by either converting them to
6061 ASM_SIMPLIFY or by removing them. */
6064 collect_source_relocs (bfd *abfd,
6066 struct bfd_link_info *link_info)
6068 Elf_Internal_Rela *internal_relocs;
6070 bfd_boolean ok = TRUE;
6072 bfd_size_type sec_size;
6074 internal_relocs = retrieve_internal_relocs (abfd, sec,
6075 link_info->keep_memory);
6076 if (internal_relocs == NULL)
6079 sec_size = bfd_get_section_limit (abfd, sec);
6080 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
6081 if (contents == NULL && sec_size != 0)
6087 /* Record relocations against relaxable literal sections. */
6088 for (i = 0; i < sec->reloc_count; i++)
6090 Elf_Internal_Rela *irel = &internal_relocs[i];
6092 asection *target_sec;
6093 xtensa_relax_info *target_relax_info;
6095 r_reloc_init (&r_rel, abfd, irel, contents, sec_size);
6097 target_sec = r_reloc_get_section (&r_rel);
6098 target_relax_info = get_xtensa_relax_info (target_sec);
6100 if (target_relax_info
6101 && (target_relax_info->is_relaxable_literal_section
6102 || target_relax_info->is_relaxable_asm_section))
6104 xtensa_opcode opcode = XTENSA_UNDEFINED;
6106 bfd_boolean is_abs_literal = FALSE;
6108 if (is_alt_relocation (ELF32_R_TYPE (irel->r_info)))
6110 /* None of the current alternate relocs are PC-relative,
6111 and only PC-relative relocs matter here. However, we
6112 still need to record the opcode for literal
6114 opcode = get_relocation_opcode (abfd, sec, contents, irel);
6115 if (opcode == get_l32r_opcode ())
6117 is_abs_literal = TRUE;
6121 opcode = XTENSA_UNDEFINED;
6123 else if (is_operand_relocation (ELF32_R_TYPE (irel->r_info)))
6125 opcode = get_relocation_opcode (abfd, sec, contents, irel);
6126 opnd = get_relocation_opnd (opcode, ELF32_R_TYPE (irel->r_info));
6129 if (opcode != XTENSA_UNDEFINED)
6131 int src_next = target_relax_info->src_next++;
6132 source_reloc *s_reloc = &target_relax_info->src_relocs[src_next];
6134 init_source_reloc (s_reloc, sec, &r_rel, opcode, opnd,
6140 /* Now get rid of ASM_EXPAND relocations. At this point, the
6141 src_relocs array for the target literal section may still be
6142 incomplete, but it must at least contain the entries for the L32R
6143 relocations associated with ASM_EXPANDs because they were just
6144 added in the preceding loop over the relocations. */
6146 for (i = 0; i < sec->reloc_count; i++)
6148 Elf_Internal_Rela *irel = &internal_relocs[i];
6149 bfd_boolean is_reachable;
6151 if (!is_resolvable_asm_expansion (abfd, sec, contents, irel, link_info,
6157 Elf_Internal_Rela *l32r_irel;
6159 asection *target_sec;
6160 xtensa_relax_info *target_relax_info;
6162 /* Mark the source_reloc for the L32R so that it will be
6163 removed in compute_removed_literals(), along with the
6164 associated literal. */
6165 l32r_irel = find_associated_l32r_irel (abfd, sec, contents,
6166 irel, internal_relocs);
6167 if (l32r_irel == NULL)
6170 r_reloc_init (&r_rel, abfd, l32r_irel, contents, sec_size);
6172 target_sec = r_reloc_get_section (&r_rel);
6173 target_relax_info = get_xtensa_relax_info (target_sec);
6175 if (target_relax_info
6176 && (target_relax_info->is_relaxable_literal_section
6177 || target_relax_info->is_relaxable_asm_section))
6179 source_reloc *s_reloc;
6181 /* Search the source_relocs for the entry corresponding to
6182 the l32r_irel. Note: The src_relocs array is not yet
6183 sorted, but it wouldn't matter anyway because we're
6184 searching by source offset instead of target offset. */
6185 s_reloc = find_source_reloc (target_relax_info->src_relocs,
6186 target_relax_info->src_next,
6188 BFD_ASSERT (s_reloc);
6189 s_reloc->is_null = TRUE;
6192 /* Convert this reloc to ASM_SIMPLIFY. */
6193 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
6194 R_XTENSA_ASM_SIMPLIFY);
6195 l32r_irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
6197 pin_internal_relocs (sec, internal_relocs);
6201 /* It is resolvable but doesn't reach. We resolve now
6202 by eliminating the relocation -- the call will remain
6203 expanded into L32R/CALLX. */
6204 irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
6205 pin_internal_relocs (sec, internal_relocs);
6210 release_contents (sec, contents);
6211 release_internal_relocs (sec, internal_relocs);
6216 /* Return TRUE if the asm expansion can be resolved. Generally it can
6217 be resolved on a final link or when a partial link locates it in the
6218 same section as the target. Set "is_reachable" flag if the target of
6219 the call is within the range of a direct call, given the current VMA
6220 for this section and the target section. */
6223 is_resolvable_asm_expansion (bfd *abfd,
6226 Elf_Internal_Rela *irel,
6227 struct bfd_link_info *link_info,
6228 bfd_boolean *is_reachable_p)
6230 asection *target_sec;
6231 bfd_vma target_offset;
6233 xtensa_opcode opcode, direct_call_opcode;
6234 bfd_vma self_address;
6235 bfd_vma dest_address;
6236 bfd_boolean uses_l32r;
6237 bfd_size_type sec_size;
6239 *is_reachable_p = FALSE;
6241 if (contents == NULL)
6244 if (ELF32_R_TYPE (irel->r_info) != R_XTENSA_ASM_EXPAND)
6247 sec_size = bfd_get_section_limit (abfd, sec);
6248 opcode = get_expanded_call_opcode (contents + irel->r_offset,
6249 sec_size - irel->r_offset, &uses_l32r);
6250 /* Optimization of longcalls that use CONST16 is not yet implemented. */
6254 direct_call_opcode = swap_callx_for_call_opcode (opcode);
6255 if (direct_call_opcode == XTENSA_UNDEFINED)
6258 /* Check and see that the target resolves. */
6259 r_reloc_init (&r_rel, abfd, irel, contents, sec_size);
6260 if (!r_reloc_is_defined (&r_rel))
6263 target_sec = r_reloc_get_section (&r_rel);
6264 target_offset = r_rel.target_offset;
6266 /* If the target is in a shared library, then it doesn't reach. This
6267 isn't supposed to come up because the compiler should never generate
6268 non-PIC calls on systems that use shared libraries, but the linker
6269 shouldn't crash regardless. */
6270 if (!target_sec->output_section)
6273 /* For relocatable sections, we can only simplify when the output
6274 section of the target is the same as the output section of the
6276 if (link_info->relocatable
6277 && (target_sec->output_section != sec->output_section
6278 || is_reloc_sym_weak (abfd, irel)))
6281 self_address = (sec->output_section->vma
6282 + sec->output_offset + irel->r_offset + 3);
6283 dest_address = (target_sec->output_section->vma
6284 + target_sec->output_offset + target_offset);
6286 *is_reachable_p = pcrel_reloc_fits (direct_call_opcode, 0,
6287 self_address, dest_address);
6289 if ((self_address >> CALL_SEGMENT_BITS) !=
6290 (dest_address >> CALL_SEGMENT_BITS))
6297 static Elf_Internal_Rela *
6298 find_associated_l32r_irel (bfd *abfd,
6301 Elf_Internal_Rela *other_irel,
6302 Elf_Internal_Rela *internal_relocs)
6306 for (i = 0; i < sec->reloc_count; i++)
6308 Elf_Internal_Rela *irel = &internal_relocs[i];
6310 if (irel == other_irel)
6312 if (irel->r_offset != other_irel->r_offset)
6314 if (is_l32r_relocation (abfd, sec, contents, irel))
6322 static xtensa_opcode *
6323 build_reloc_opcodes (bfd *abfd,
6326 Elf_Internal_Rela *internal_relocs)
6329 xtensa_opcode *reloc_opcodes =
6330 (xtensa_opcode *) bfd_malloc (sizeof (xtensa_opcode) * sec->reloc_count);
6331 for (i = 0; i < sec->reloc_count; i++)
6333 Elf_Internal_Rela *irel = &internal_relocs[i];
6334 reloc_opcodes[i] = get_relocation_opcode (abfd, sec, contents, irel);
6336 return reloc_opcodes;
6340 /* The compute_text_actions function will build a list of potential
6341 transformation actions for code in the extended basic block of each
6342 longcall that is optimized to a direct call. From this list we
6343 generate a set of actions to actually perform that optimizes for
6344 space and, if not using size_opt, maintains branch target
6347 These actions to be performed are placed on a per-section list.
6348 The actual changes are performed by relax_section() in the second
6352 compute_text_actions (bfd *abfd,
6354 struct bfd_link_info *link_info)
6356 xtensa_opcode *reloc_opcodes = NULL;
6357 xtensa_relax_info *relax_info;
6359 Elf_Internal_Rela *internal_relocs;
6360 bfd_boolean ok = TRUE;
6362 property_table_entry *prop_table = 0;
6364 bfd_size_type sec_size;
6365 static bfd_boolean no_insn_move = FALSE;
6370 /* Do nothing if the section contains no optimized longcalls. */
6371 relax_info = get_xtensa_relax_info (sec);
6372 BFD_ASSERT (relax_info);
6373 if (!relax_info->is_relaxable_asm_section)
6376 internal_relocs = retrieve_internal_relocs (abfd, sec,
6377 link_info->keep_memory);
6379 if (internal_relocs)
6380 qsort (internal_relocs, sec->reloc_count, sizeof (Elf_Internal_Rela),
6381 internal_reloc_compare);
6383 sec_size = bfd_get_section_limit (abfd, sec);
6384 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
6385 if (contents == NULL && sec_size != 0)
6391 ptblsize = xtensa_read_table_entries (abfd, sec, &prop_table,
6392 XTENSA_PROP_SEC_NAME, FALSE);
6399 for (i = 0; i < sec->reloc_count; i++)
6401 Elf_Internal_Rela *irel = &internal_relocs[i];
6403 property_table_entry *the_entry;
6406 ebb_constraint ebb_table;
6407 bfd_size_type simplify_size;
6409 if (irel && ELF32_R_TYPE (irel->r_info) != R_XTENSA_ASM_SIMPLIFY)
6411 r_offset = irel->r_offset;
6413 simplify_size = get_asm_simplify_size (contents, sec_size, r_offset);
6414 if (simplify_size == 0)
6416 (*_bfd_error_handler)
6417 (_("%B(%A+0x%lx): could not decode instruction for XTENSA_ASM_SIMPLIFY relocation; possible configuration mismatch"),
6418 sec->owner, sec, r_offset);
6422 /* If the instruction table is not around, then don't do this
6424 the_entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
6425 sec->vma + irel->r_offset);
6426 if (the_entry == NULL || XTENSA_NO_NOP_REMOVAL)
6428 text_action_add (&relax_info->action_list,
6429 ta_convert_longcall, sec, r_offset,
6434 /* If the next longcall happens to be at the same address as an
6435 unreachable section of size 0, then skip forward. */
6436 ptbl_idx = the_entry - prop_table;
6437 while ((the_entry->flags & XTENSA_PROP_UNREACHABLE)
6438 && the_entry->size == 0
6439 && ptbl_idx + 1 < ptblsize
6440 && (prop_table[ptbl_idx + 1].address
6441 == prop_table[ptbl_idx].address))
6447 if (the_entry->flags & XTENSA_PROP_INSN_NO_TRANSFORM)
6448 /* NO_REORDER is OK */
6451 init_ebb_constraint (&ebb_table);
6452 ebb = &ebb_table.ebb;
6453 init_ebb (ebb, sec, contents, sec_size, prop_table, ptblsize,
6454 internal_relocs, sec->reloc_count);
6455 ebb->start_offset = r_offset + simplify_size;
6456 ebb->end_offset = r_offset + simplify_size;
6457 ebb->start_ptbl_idx = ptbl_idx;
6458 ebb->end_ptbl_idx = ptbl_idx;
6459 ebb->start_reloc_idx = i;
6460 ebb->end_reloc_idx = i;
6462 /* Precompute the opcode for each relocation. */
6463 if (reloc_opcodes == NULL)
6464 reloc_opcodes = build_reloc_opcodes (abfd, sec, contents,
6467 if (!extend_ebb_bounds (ebb)
6468 || !compute_ebb_proposed_actions (&ebb_table)
6469 || !compute_ebb_actions (&ebb_table)
6470 || !check_section_ebb_pcrels_fit (abfd, sec, contents,
6471 internal_relocs, &ebb_table,
6473 || !check_section_ebb_reduces (&ebb_table))
6475 /* If anything goes wrong or we get unlucky and something does
6476 not fit, with our plan because of expansion between
6477 critical branches, just convert to a NOP. */
6479 text_action_add (&relax_info->action_list,
6480 ta_convert_longcall, sec, r_offset, 0);
6481 i = ebb_table.ebb.end_reloc_idx;
6482 free_ebb_constraint (&ebb_table);
6486 text_action_add_proposed (&relax_info->action_list, &ebb_table, sec);
6488 /* Update the index so we do not go looking at the relocations
6489 we have already processed. */
6490 i = ebb_table.ebb.end_reloc_idx;
6491 free_ebb_constraint (&ebb_table);
6495 if (relax_info->action_list.head)
6496 print_action_list (stderr, &relax_info->action_list);
6500 release_contents (sec, contents);
6501 release_internal_relocs (sec, internal_relocs);
6505 free (reloc_opcodes);
6511 /* Do not widen an instruction if it is preceeded by a
6512 loop opcode. It might cause misalignment. */
6515 prev_instr_is_a_loop (bfd_byte *contents,
6516 bfd_size_type content_length,
6517 bfd_size_type offset)
6519 xtensa_opcode prev_opcode;
6523 prev_opcode = insn_decode_opcode (contents, content_length, offset-3, 0);
6524 return (xtensa_opcode_is_loop (xtensa_default_isa, prev_opcode) == 1);
6528 /* Find all of the possible actions for an extended basic block. */
6531 compute_ebb_proposed_actions (ebb_constraint *ebb_table)
6533 const ebb_t *ebb = &ebb_table->ebb;
6534 unsigned rel_idx = ebb->start_reloc_idx;
6535 property_table_entry *entry, *start_entry, *end_entry;
6537 xtensa_isa isa = xtensa_default_isa;
6539 static xtensa_insnbuf insnbuf = NULL;
6540 static xtensa_insnbuf slotbuf = NULL;
6542 if (insnbuf == NULL)
6544 insnbuf = xtensa_insnbuf_alloc (isa);
6545 slotbuf = xtensa_insnbuf_alloc (isa);
6548 start_entry = &ebb->ptbl[ebb->start_ptbl_idx];
6549 end_entry = &ebb->ptbl[ebb->end_ptbl_idx];
6551 for (entry = start_entry; entry <= end_entry; entry++)
6553 bfd_vma start_offset, end_offset;
6554 bfd_size_type insn_len;
6556 start_offset = entry->address - ebb->sec->vma;
6557 end_offset = entry->address + entry->size - ebb->sec->vma;
6559 if (entry == start_entry)
6560 start_offset = ebb->start_offset;
6561 if (entry == end_entry)
6562 end_offset = ebb->end_offset;
6563 offset = start_offset;
6565 if (offset == entry->address - ebb->sec->vma
6566 && (entry->flags & XTENSA_PROP_INSN_BRANCH_TARGET) != 0)
6568 enum ebb_target_enum align_type = EBB_DESIRE_TGT_ALIGN;
6569 BFD_ASSERT (offset != end_offset);
6570 if (offset == end_offset)
6573 insn_len = insn_decode_len (ebb->contents, ebb->content_length,
6578 if (check_branch_target_aligned_address (offset, insn_len))
6579 align_type = EBB_REQUIRE_TGT_ALIGN;
6581 ebb_propose_action (ebb_table, align_type, 0,
6582 ta_none, offset, 0, TRUE);
6585 while (offset != end_offset)
6587 Elf_Internal_Rela *irel;
6588 xtensa_opcode opcode;
6590 while (rel_idx < ebb->end_reloc_idx
6591 && (ebb->relocs[rel_idx].r_offset < offset
6592 || (ebb->relocs[rel_idx].r_offset == offset
6593 && (ELF32_R_TYPE (ebb->relocs[rel_idx].r_info)
6594 != R_XTENSA_ASM_SIMPLIFY))))
6597 /* Check for longcall. */
6598 irel = &ebb->relocs[rel_idx];
6599 if (irel->r_offset == offset
6600 && ELF32_R_TYPE (irel->r_info) == R_XTENSA_ASM_SIMPLIFY)
6602 bfd_size_type simplify_size;
6604 simplify_size = get_asm_simplify_size (ebb->contents,
6605 ebb->content_length,
6607 if (simplify_size == 0)
6610 ebb_propose_action (ebb_table, EBB_NO_ALIGN, 0,
6611 ta_convert_longcall, offset, 0, TRUE);
6613 offset += simplify_size;
6617 if (offset + MIN_INSN_LENGTH > ebb->content_length)
6619 xtensa_insnbuf_from_chars (isa, insnbuf, &ebb->contents[offset],
6620 ebb->content_length - offset);
6621 fmt = xtensa_format_decode (isa, insnbuf);
6622 if (fmt == XTENSA_UNDEFINED)
6624 insn_len = xtensa_format_length (isa, fmt);
6625 if (insn_len == (bfd_size_type) XTENSA_UNDEFINED)
6628 if (xtensa_format_num_slots (isa, fmt) != 1)
6634 xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf);
6635 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
6636 if (opcode == XTENSA_UNDEFINED)
6639 if ((entry->flags & XTENSA_PROP_INSN_NO_DENSITY) == 0
6640 && (entry->flags & XTENSA_PROP_INSN_NO_TRANSFORM) == 0
6641 && can_narrow_instruction (slotbuf, fmt, opcode) != 0)
6643 /* Add an instruction narrow action. */
6644 ebb_propose_action (ebb_table, EBB_NO_ALIGN, 0,
6645 ta_narrow_insn, offset, 0, FALSE);
6647 else if ((entry->flags & XTENSA_PROP_INSN_NO_TRANSFORM) == 0
6648 && can_widen_instruction (slotbuf, fmt, opcode) != 0
6649 && ! prev_instr_is_a_loop (ebb->contents,
6650 ebb->content_length, offset))
6652 /* Add an instruction widen action. */
6653 ebb_propose_action (ebb_table, EBB_NO_ALIGN, 0,
6654 ta_widen_insn, offset, 0, FALSE);
6656 else if (xtensa_opcode_is_loop (xtensa_default_isa, opcode) == 1)
6658 /* Check for branch targets. */
6659 ebb_propose_action (ebb_table, EBB_REQUIRE_LOOP_ALIGN, 0,
6660 ta_none, offset, 0, TRUE);
6667 if (ebb->ends_unreachable)
6669 ebb_propose_action (ebb_table, EBB_NO_ALIGN, 0,
6670 ta_fill, ebb->end_offset, 0, TRUE);
6676 (*_bfd_error_handler)
6677 (_("%B(%A+0x%lx): could not decode instruction; possible configuration mismatch"),
6678 ebb->sec->owner, ebb->sec, offset);
6683 /* After all of the information has collected about the
6684 transformations possible in an EBB, compute the appropriate actions
6685 here in compute_ebb_actions. We still must check later to make
6686 sure that the actions do not break any relocations. The algorithm
6687 used here is pretty greedy. Basically, it removes as many no-ops
6688 as possible so that the end of the EBB has the same alignment
6689 characteristics as the original. First, it uses narrowing, then
6690 fill space at the end of the EBB, and finally widenings. If that
6691 does not work, it tries again with one fewer no-op removed. The
6692 optimization will only be performed if all of the branch targets
6693 that were aligned before transformation are also aligned after the
6696 When the size_opt flag is set, ignore the branch target alignments,
6697 narrow all wide instructions, and remove all no-ops unless the end
6698 of the EBB prevents it. */
6701 compute_ebb_actions (ebb_constraint *ebb_table)
6705 int removed_bytes = 0;
6706 ebb_t *ebb = &ebb_table->ebb;
6707 unsigned seg_idx_start = 0;
6708 unsigned seg_idx_end = 0;
6710 /* We perform this like the assembler relaxation algorithm: Start by
6711 assuming all instructions are narrow and all no-ops removed; then
6714 /* For each segment of this that has a solid constraint, check to
6715 see if there are any combinations that will keep the constraint.
6717 for (seg_idx_end = 0; seg_idx_end < ebb_table->action_count; seg_idx_end++)
6719 bfd_boolean requires_text_end_align = FALSE;
6720 unsigned longcall_count = 0;
6721 unsigned longcall_convert_count = 0;
6722 unsigned narrowable_count = 0;
6723 unsigned narrowable_convert_count = 0;
6724 unsigned widenable_count = 0;
6725 unsigned widenable_convert_count = 0;
6727 proposed_action *action = NULL;
6728 int align = (1 << ebb_table->ebb.sec->alignment_power);
6730 seg_idx_start = seg_idx_end;
6732 for (i = seg_idx_start; i < ebb_table->action_count; i++)
6734 action = &ebb_table->actions[i];
6735 if (action->action == ta_convert_longcall)
6737 if (action->action == ta_narrow_insn)
6739 if (action->action == ta_widen_insn)
6741 if (action->action == ta_fill)
6743 if (action->align_type == EBB_REQUIRE_LOOP_ALIGN)
6745 if (action->align_type == EBB_REQUIRE_TGT_ALIGN
6746 && !elf32xtensa_size_opt)
6751 if (seg_idx_end == ebb_table->action_count && !ebb->ends_unreachable)
6752 requires_text_end_align = TRUE;
6754 if (elf32xtensa_size_opt && !requires_text_end_align
6755 && action->align_type != EBB_REQUIRE_LOOP_ALIGN
6756 && action->align_type != EBB_REQUIRE_TGT_ALIGN)
6758 longcall_convert_count = longcall_count;
6759 narrowable_convert_count = narrowable_count;
6760 widenable_convert_count = 0;
6764 /* There is a constraint. Convert the max number of longcalls. */
6765 narrowable_convert_count = 0;
6766 longcall_convert_count = 0;
6767 widenable_convert_count = 0;
6769 for (j = 0; j < longcall_count; j++)
6771 int removed = (longcall_count - j) * 3 & (align - 1);
6772 unsigned desire_narrow = (align - removed) & (align - 1);
6773 unsigned desire_widen = removed;
6774 if (desire_narrow <= narrowable_count)
6776 narrowable_convert_count = desire_narrow;
6777 narrowable_convert_count +=
6778 (align * ((narrowable_count - narrowable_convert_count)
6780 longcall_convert_count = (longcall_count - j);
6781 widenable_convert_count = 0;
6784 if (desire_widen <= widenable_count && !elf32xtensa_size_opt)
6786 narrowable_convert_count = 0;
6787 longcall_convert_count = longcall_count - j;
6788 widenable_convert_count = desire_widen;
6794 /* Now the number of conversions are saved. Do them. */
6795 for (i = seg_idx_start; i < seg_idx_end; i++)
6797 action = &ebb_table->actions[i];
6798 switch (action->action)
6800 case ta_convert_longcall:
6801 if (longcall_convert_count != 0)
6803 action->action = ta_remove_longcall;
6804 action->do_action = TRUE;
6805 action->removed_bytes += 3;
6806 longcall_convert_count--;
6809 case ta_narrow_insn:
6810 if (narrowable_convert_count != 0)
6812 action->do_action = TRUE;
6813 action->removed_bytes += 1;
6814 narrowable_convert_count--;
6818 if (widenable_convert_count != 0)
6820 action->do_action = TRUE;
6821 action->removed_bytes -= 1;
6822 widenable_convert_count--;
6831 /* Now we move on to some local opts. Try to remove each of the
6832 remaining longcalls. */
6834 if (ebb_table->ebb.ends_section || ebb_table->ebb.ends_unreachable)
6837 for (i = 0; i < ebb_table->action_count; i++)
6839 int old_removed_bytes = removed_bytes;
6840 proposed_action *action = &ebb_table->actions[i];
6842 if (action->do_action && action->action == ta_convert_longcall)
6844 bfd_boolean bad_alignment = FALSE;
6846 for (j = i + 1; j < ebb_table->action_count; j++)
6848 proposed_action *new_action = &ebb_table->actions[j];
6849 bfd_vma offset = new_action->offset;
6850 if (new_action->align_type == EBB_REQUIRE_TGT_ALIGN)
6852 if (!check_branch_target_aligned
6853 (ebb_table->ebb.contents,
6854 ebb_table->ebb.content_length,
6855 offset, offset - removed_bytes))
6857 bad_alignment = TRUE;
6861 if (new_action->align_type == EBB_REQUIRE_LOOP_ALIGN)
6863 if (!check_loop_aligned (ebb_table->ebb.contents,
6864 ebb_table->ebb.content_length,
6866 offset - removed_bytes))
6868 bad_alignment = TRUE;
6872 if (new_action->action == ta_narrow_insn
6873 && !new_action->do_action
6874 && ebb_table->ebb.sec->alignment_power == 2)
6876 /* Narrow an instruction and we are done. */
6877 new_action->do_action = TRUE;
6878 new_action->removed_bytes += 1;
6879 bad_alignment = FALSE;
6882 if (new_action->action == ta_widen_insn
6883 && new_action->do_action
6884 && ebb_table->ebb.sec->alignment_power == 2)
6886 /* Narrow an instruction and we are done. */
6887 new_action->do_action = FALSE;
6888 new_action->removed_bytes += 1;
6889 bad_alignment = FALSE;
6895 action->removed_bytes += 3;
6896 action->action = ta_remove_longcall;
6897 action->do_action = TRUE;
6900 removed_bytes = old_removed_bytes;
6901 if (action->do_action)
6902 removed_bytes += action->removed_bytes;
6907 for (i = 0; i < ebb_table->action_count; ++i)
6909 proposed_action *action = &ebb_table->actions[i];
6910 if (action->do_action)
6911 removed_bytes += action->removed_bytes;
6914 if ((removed_bytes % (1 << ebb_table->ebb.sec->alignment_power)) != 0
6915 && ebb->ends_unreachable)
6917 proposed_action *action;
6921 BFD_ASSERT (ebb_table->action_count != 0);
6922 action = &ebb_table->actions[ebb_table->action_count - 1];
6923 BFD_ASSERT (action->action == ta_fill);
6924 BFD_ASSERT (ebb->ends_unreachable->flags & XTENSA_PROP_UNREACHABLE);
6926 extra_space = compute_fill_extra_space (ebb->ends_unreachable);
6927 br = action->removed_bytes + removed_bytes + extra_space;
6928 br = br & ((1 << ebb->sec->alignment_power ) - 1);
6930 action->removed_bytes = extra_space - br;
6936 /* The xlate_map is a sorted array of address mappings designed to
6937 answer the offset_with_removed_text() query with a binary search instead
6938 of a linear search through the section's action_list. */
6940 typedef struct xlate_map_entry xlate_map_entry_t;
6941 typedef struct xlate_map xlate_map_t;
6943 struct xlate_map_entry
6945 unsigned orig_address;
6946 unsigned new_address;
6952 unsigned entry_count;
6953 xlate_map_entry_t *entry;
6958 xlate_compare (const void *a_v, const void *b_v)
6960 const xlate_map_entry_t *a = (const xlate_map_entry_t *) a_v;
6961 const xlate_map_entry_t *b = (const xlate_map_entry_t *) b_v;
6962 if (a->orig_address < b->orig_address)
6964 if (a->orig_address > (b->orig_address + b->size - 1))
6971 xlate_offset_with_removed_text (const xlate_map_t *map,
6972 text_action_list *action_list,
6975 xlate_map_entry_t tmp;
6977 xlate_map_entry_t *e;
6980 return offset_with_removed_text (action_list, offset);
6982 if (map->entry_count == 0)
6985 tmp.orig_address = offset;
6986 tmp.new_address = offset;
6989 r = bsearch (&offset, map->entry, map->entry_count,
6990 sizeof (xlate_map_entry_t), &xlate_compare);
6991 e = (xlate_map_entry_t *) r;
6993 BFD_ASSERT (e != NULL);
6996 return e->new_address - e->orig_address + offset;
7000 /* Build a binary searchable offset translation map from a section's
7003 static xlate_map_t *
7004 build_xlate_map (asection *sec, xtensa_relax_info *relax_info)
7006 xlate_map_t *map = (xlate_map_t *) bfd_malloc (sizeof (xlate_map_t));
7007 text_action_list *action_list = &relax_info->action_list;
7008 unsigned num_actions = 0;
7011 xlate_map_entry_t *current_entry;
7016 num_actions = action_list_count (action_list);
7017 map->entry = (xlate_map_entry_t *)
7018 bfd_malloc (sizeof (xlate_map_entry_t) * (num_actions + 1));
7019 if (map->entry == NULL)
7024 map->entry_count = 0;
7027 current_entry = &map->entry[0];
7029 current_entry->orig_address = 0;
7030 current_entry->new_address = 0;
7031 current_entry->size = 0;
7033 for (r = action_list->head; r != NULL; r = r->next)
7035 unsigned orig_size = 0;
7039 case ta_remove_insn:
7040 case ta_convert_longcall:
7041 case ta_remove_literal:
7042 case ta_add_literal:
7044 case ta_remove_longcall:
7047 case ta_narrow_insn:
7056 current_entry->size =
7057 r->offset + orig_size - current_entry->orig_address;
7058 if (current_entry->size != 0)
7063 current_entry->orig_address = r->offset + orig_size;
7064 removed += r->removed_bytes;
7065 current_entry->new_address = r->offset + orig_size - removed;
7066 current_entry->size = 0;
7069 current_entry->size = (bfd_get_section_limit (sec->owner, sec)
7070 - current_entry->orig_address);
7071 if (current_entry->size != 0)
7078 /* Free an offset translation map. */
7081 free_xlate_map (xlate_map_t *map)
7083 if (map && map->entry)
7090 /* Use check_section_ebb_pcrels_fit to make sure that all of the
7091 relocations in a section will fit if a proposed set of actions
7095 check_section_ebb_pcrels_fit (bfd *abfd,
7098 Elf_Internal_Rela *internal_relocs,
7099 const ebb_constraint *constraint,
7100 const xtensa_opcode *reloc_opcodes)
7103 Elf_Internal_Rela *irel;
7104 xlate_map_t *xmap = NULL;
7105 bfd_boolean ok = TRUE;
7106 xtensa_relax_info *relax_info;
7108 relax_info = get_xtensa_relax_info (sec);
7110 if (relax_info && sec->reloc_count > 100)
7112 xmap = build_xlate_map (sec, relax_info);
7113 /* NULL indicates out of memory, but the slow version
7114 can still be used. */
7117 for (i = 0; i < sec->reloc_count; i++)
7120 bfd_vma orig_self_offset, orig_target_offset;
7121 bfd_vma self_offset, target_offset;
7123 reloc_howto_type *howto;
7124 int self_removed_bytes, target_removed_bytes;
7126 irel = &internal_relocs[i];
7127 r_type = ELF32_R_TYPE (irel->r_info);
7129 howto = &elf_howto_table[r_type];
7130 /* We maintain the required invariant: PC-relative relocations
7131 that fit before linking must fit after linking. Thus we only
7132 need to deal with relocations to the same section that are
7134 if (ELF32_R_TYPE (irel->r_info) == R_XTENSA_ASM_SIMPLIFY
7135 || !howto->pc_relative)
7138 r_reloc_init (&r_rel, abfd, irel, contents,
7139 bfd_get_section_limit (abfd, sec));
7141 if (r_reloc_get_section (&r_rel) != sec)
7144 orig_self_offset = irel->r_offset;
7145 orig_target_offset = r_rel.target_offset;
7147 self_offset = orig_self_offset;
7148 target_offset = orig_target_offset;
7153 xlate_offset_with_removed_text (xmap, &relax_info->action_list,
7156 xlate_offset_with_removed_text (xmap, &relax_info->action_list,
7157 orig_target_offset);
7160 self_removed_bytes = 0;
7161 target_removed_bytes = 0;
7163 for (j = 0; j < constraint->action_count; ++j)
7165 proposed_action *action = &constraint->actions[j];
7166 bfd_vma offset = action->offset;
7167 int removed_bytes = action->removed_bytes;
7168 if (offset < orig_self_offset
7169 || (offset == orig_self_offset && action->action == ta_fill
7170 && action->removed_bytes < 0))
7171 self_removed_bytes += removed_bytes;
7172 if (offset < orig_target_offset
7173 || (offset == orig_target_offset && action->action == ta_fill
7174 && action->removed_bytes < 0))
7175 target_removed_bytes += removed_bytes;
7177 self_offset -= self_removed_bytes;
7178 target_offset -= target_removed_bytes;
7180 /* Try to encode it. Get the operand and check. */
7181 if (is_alt_relocation (ELF32_R_TYPE (irel->r_info)))
7183 /* None of the current alternate relocs are PC-relative,
7184 and only PC-relative relocs matter here. */
7188 xtensa_opcode opcode;
7192 opcode = reloc_opcodes[i];
7194 opcode = get_relocation_opcode (abfd, sec, contents, irel);
7195 if (opcode == XTENSA_UNDEFINED)
7201 opnum = get_relocation_opnd (opcode, ELF32_R_TYPE (irel->r_info));
7202 if (opnum == XTENSA_UNDEFINED)
7208 if (!pcrel_reloc_fits (opcode, opnum, self_offset, target_offset))
7217 free_xlate_map (xmap);
7224 check_section_ebb_reduces (const ebb_constraint *constraint)
7229 for (i = 0; i < constraint->action_count; i++)
7231 const proposed_action *action = &constraint->actions[i];
7232 if (action->do_action)
7233 removed += action->removed_bytes;
7243 text_action_add_proposed (text_action_list *l,
7244 const ebb_constraint *ebb_table,
7249 for (i = 0; i < ebb_table->action_count; i++)
7251 proposed_action *action = &ebb_table->actions[i];
7253 if (!action->do_action)
7255 switch (action->action)
7257 case ta_remove_insn:
7258 case ta_remove_longcall:
7259 case ta_convert_longcall:
7260 case ta_narrow_insn:
7263 case ta_remove_literal:
7264 text_action_add (l, action->action, sec, action->offset,
7265 action->removed_bytes);
7278 compute_fill_extra_space (property_table_entry *entry)
7280 int fill_extra_space;
7285 if ((entry->flags & XTENSA_PROP_UNREACHABLE) == 0)
7288 fill_extra_space = entry->size;
7289 if ((entry->flags & XTENSA_PROP_ALIGN) != 0)
7291 /* Fill bytes for alignment:
7292 (2**n)-1 - (addr + (2**n)-1) & (2**n -1) */
7293 int pow = GET_XTENSA_PROP_ALIGNMENT (entry->flags);
7294 int nsm = (1 << pow) - 1;
7295 bfd_vma addr = entry->address + entry->size;
7296 bfd_vma align_fill = nsm - ((addr + nsm) & nsm);
7297 fill_extra_space += align_fill;
7299 return fill_extra_space;
7303 /* First relaxation pass. */
7305 /* If the section contains relaxable literals, check each literal to
7306 see if it has the same value as another literal that has already
7307 been seen, either in the current section or a previous one. If so,
7308 add an entry to the per-section list of removed literals. The
7309 actual changes are deferred until the next pass. */
7312 compute_removed_literals (bfd *abfd,
7314 struct bfd_link_info *link_info,
7315 value_map_hash_table *values)
7317 xtensa_relax_info *relax_info;
7319 Elf_Internal_Rela *internal_relocs;
7320 source_reloc *src_relocs, *rel;
7321 bfd_boolean ok = TRUE;
7322 property_table_entry *prop_table = NULL;
7325 bfd_boolean last_loc_is_prev = FALSE;
7326 bfd_vma last_target_offset = 0;
7327 section_cache_t target_sec_cache;
7328 bfd_size_type sec_size;
7330 init_section_cache (&target_sec_cache);
7332 /* Do nothing if it is not a relaxable literal section. */
7333 relax_info = get_xtensa_relax_info (sec);
7334 BFD_ASSERT (relax_info);
7335 if (!relax_info->is_relaxable_literal_section)
7338 internal_relocs = retrieve_internal_relocs (abfd, sec,
7339 link_info->keep_memory);
7341 sec_size = bfd_get_section_limit (abfd, sec);
7342 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
7343 if (contents == NULL && sec_size != 0)
7349 /* Sort the source_relocs by target offset. */
7350 src_relocs = relax_info->src_relocs;
7351 qsort (src_relocs, relax_info->src_count,
7352 sizeof (source_reloc), source_reloc_compare);
7353 qsort (internal_relocs, sec->reloc_count, sizeof (Elf_Internal_Rela),
7354 internal_reloc_compare);
7356 ptblsize = xtensa_read_table_entries (abfd, sec, &prop_table,
7357 XTENSA_PROP_SEC_NAME, FALSE);
7365 for (i = 0; i < relax_info->src_count; i++)
7367 Elf_Internal_Rela *irel = NULL;
7369 rel = &src_relocs[i];
7370 if (get_l32r_opcode () != rel->opcode)
7372 irel = get_irel_at_offset (sec, internal_relocs,
7373 rel->r_rel.target_offset);
7375 /* If the relocation on this is not a simple R_XTENSA_32 or
7376 R_XTENSA_PLT then do not consider it. This may happen when
7377 the difference of two symbols is used in a literal. */
7378 if (irel && (ELF32_R_TYPE (irel->r_info) != R_XTENSA_32
7379 && ELF32_R_TYPE (irel->r_info) != R_XTENSA_PLT))
7382 /* If the target_offset for this relocation is the same as the
7383 previous relocation, then we've already considered whether the
7384 literal can be coalesced. Skip to the next one.... */
7385 if (i != 0 && prev_i != -1
7386 && src_relocs[i-1].r_rel.target_offset == rel->r_rel.target_offset)
7390 if (last_loc_is_prev &&
7391 last_target_offset + 4 != rel->r_rel.target_offset)
7392 last_loc_is_prev = FALSE;
7394 /* Check if the relocation was from an L32R that is being removed
7395 because a CALLX was converted to a direct CALL, and check if
7396 there are no other relocations to the literal. */
7397 if (is_removable_literal (rel, i, src_relocs, relax_info->src_count))
7399 if (!remove_dead_literal (abfd, sec, link_info, internal_relocs,
7400 irel, rel, prop_table, ptblsize))
7405 last_target_offset = rel->r_rel.target_offset;
7409 if (!identify_literal_placement (abfd, sec, contents, link_info,
7411 &last_loc_is_prev, irel,
7412 relax_info->src_count - i, rel,
7413 prop_table, ptblsize,
7414 &target_sec_cache, rel->is_abs_literal))
7419 last_target_offset = rel->r_rel.target_offset;
7423 print_removed_literals (stderr, &relax_info->removed_list);
7424 print_action_list (stderr, &relax_info->action_list);
7428 if (prop_table) free (prop_table);
7429 clear_section_cache (&target_sec_cache);
7431 release_contents (sec, contents);
7432 release_internal_relocs (sec, internal_relocs);
7437 static Elf_Internal_Rela *
7438 get_irel_at_offset (asection *sec,
7439 Elf_Internal_Rela *internal_relocs,
7443 Elf_Internal_Rela *irel;
7445 Elf_Internal_Rela key;
7447 if (!internal_relocs)
7450 key.r_offset = offset;
7451 irel = bsearch (&key, internal_relocs, sec->reloc_count,
7452 sizeof (Elf_Internal_Rela), internal_reloc_matches);
7456 /* bsearch does not guarantee which will be returned if there are
7457 multiple matches. We need the first that is not an alignment. */
7458 i = irel - internal_relocs;
7461 if (internal_relocs[i-1].r_offset != offset)
7465 for ( ; i < sec->reloc_count; i++)
7467 irel = &internal_relocs[i];
7468 r_type = ELF32_R_TYPE (irel->r_info);
7469 if (irel->r_offset == offset && r_type != R_XTENSA_NONE)
7478 is_removable_literal (const source_reloc *rel,
7480 const source_reloc *src_relocs,
7483 const source_reloc *curr_rel;
7487 for (++i; i < src_count; ++i)
7489 curr_rel = &src_relocs[i];
7490 /* If all others have the same target offset.... */
7491 if (curr_rel->r_rel.target_offset != rel->r_rel.target_offset)
7494 if (!curr_rel->is_null
7495 && !xtensa_is_property_section (curr_rel->source_sec)
7496 && !(curr_rel->source_sec->flags & SEC_DEBUGGING))
7504 remove_dead_literal (bfd *abfd,
7506 struct bfd_link_info *link_info,
7507 Elf_Internal_Rela *internal_relocs,
7508 Elf_Internal_Rela *irel,
7510 property_table_entry *prop_table,
7513 property_table_entry *entry;
7514 xtensa_relax_info *relax_info;
7516 relax_info = get_xtensa_relax_info (sec);
7520 entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
7521 sec->vma + rel->r_rel.target_offset);
7523 /* Mark the unused literal so that it will be removed. */
7524 add_removed_literal (&relax_info->removed_list, &rel->r_rel, NULL);
7526 text_action_add (&relax_info->action_list,
7527 ta_remove_literal, sec, rel->r_rel.target_offset, 4);
7529 /* If the section is 4-byte aligned, do not add fill. */
7530 if (sec->alignment_power > 2)
7532 int fill_extra_space;
7533 bfd_vma entry_sec_offset;
7535 property_table_entry *the_add_entry;
7539 entry_sec_offset = entry->address - sec->vma + entry->size;
7541 entry_sec_offset = rel->r_rel.target_offset + 4;
7543 /* If the literal range is at the end of the section,
7545 the_add_entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
7547 fill_extra_space = compute_fill_extra_space (the_add_entry);
7549 fa = find_fill_action (&relax_info->action_list, sec, entry_sec_offset);
7550 removed_diff = compute_removed_action_diff (fa, sec, entry_sec_offset,
7551 -4, fill_extra_space);
7553 adjust_fill_action (fa, removed_diff);
7555 text_action_add (&relax_info->action_list,
7556 ta_fill, sec, entry_sec_offset, removed_diff);
7559 /* Zero out the relocation on this literal location. */
7562 if (elf_hash_table (link_info)->dynamic_sections_created)
7563 shrink_dynamic_reloc_sections (link_info, abfd, sec, irel);
7565 irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
7566 pin_internal_relocs (sec, internal_relocs);
7569 /* Do not modify "last_loc_is_prev". */
7575 identify_literal_placement (bfd *abfd,
7578 struct bfd_link_info *link_info,
7579 value_map_hash_table *values,
7580 bfd_boolean *last_loc_is_prev_p,
7581 Elf_Internal_Rela *irel,
7582 int remaining_src_rels,
7584 property_table_entry *prop_table,
7586 section_cache_t *target_sec_cache,
7587 bfd_boolean is_abs_literal)
7591 xtensa_relax_info *relax_info;
7592 bfd_boolean literal_placed = FALSE;
7594 unsigned long value;
7595 bfd_boolean final_static_link;
7596 bfd_size_type sec_size;
7598 relax_info = get_xtensa_relax_info (sec);
7602 sec_size = bfd_get_section_limit (abfd, sec);
7605 (!link_info->relocatable
7606 && !elf_hash_table (link_info)->dynamic_sections_created);
7608 /* The placement algorithm first checks to see if the literal is
7609 already in the value map. If so and the value map is reachable
7610 from all uses, then the literal is moved to that location. If
7611 not, then we identify the last location where a fresh literal was
7612 placed. If the literal can be safely moved there, then we do so.
7613 If not, then we assume that the literal is not to move and leave
7614 the literal where it is, marking it as the last literal
7617 /* Find the literal value. */
7619 r_reloc_init (&r_rel, abfd, irel, contents, sec_size);
7622 BFD_ASSERT (rel->r_rel.target_offset < sec_size);
7623 value = bfd_get_32 (abfd, contents + rel->r_rel.target_offset);
7625 init_literal_value (&val, &r_rel, value, is_abs_literal);
7627 /* Check if we've seen another literal with the same value that
7628 is in the same output section. */
7629 val_map = value_map_get_cached_value (values, &val, final_static_link);
7632 && (r_reloc_get_section (&val_map->loc)->output_section
7633 == sec->output_section)
7634 && relocations_reach (rel, remaining_src_rels, &val_map->loc)
7635 && coalesce_shared_literal (sec, rel, prop_table, ptblsize, val_map))
7637 /* No change to last_loc_is_prev. */
7638 literal_placed = TRUE;
7641 /* For relocatable links, do not try to move literals. To do it
7642 correctly might increase the number of relocations in an input
7643 section making the default relocatable linking fail. */
7644 if (!link_info->relocatable && !literal_placed
7645 && values->has_last_loc && !(*last_loc_is_prev_p))
7647 asection *target_sec = r_reloc_get_section (&values->last_loc);
7648 if (target_sec && target_sec->output_section == sec->output_section)
7650 /* Increment the virtual offset. */
7651 r_reloc try_loc = values->last_loc;
7652 try_loc.virtual_offset += 4;
7654 /* There is a last loc that was in the same output section. */
7655 if (relocations_reach (rel, remaining_src_rels, &try_loc)
7656 && move_shared_literal (sec, link_info, rel,
7657 prop_table, ptblsize,
7658 &try_loc, &val, target_sec_cache))
7660 values->last_loc.virtual_offset += 4;
7661 literal_placed = TRUE;
7663 val_map = add_value_map (values, &val, &try_loc,
7666 val_map->loc = try_loc;
7671 if (!literal_placed)
7673 /* Nothing worked, leave the literal alone but update the last loc. */
7674 values->has_last_loc = TRUE;
7675 values->last_loc = rel->r_rel;
7677 val_map = add_value_map (values, &val, &rel->r_rel, final_static_link);
7679 val_map->loc = rel->r_rel;
7680 *last_loc_is_prev_p = TRUE;
7687 /* Check if the original relocations (presumably on L32R instructions)
7688 identified by reloc[0..N] can be changed to reference the literal
7689 identified by r_rel. If r_rel is out of range for any of the
7690 original relocations, then we don't want to coalesce the original
7691 literal with the one at r_rel. We only check reloc[0..N], where the
7692 offsets are all the same as for reloc[0] (i.e., they're all
7693 referencing the same literal) and where N is also bounded by the
7694 number of remaining entries in the "reloc" array. The "reloc" array
7695 is sorted by target offset so we know all the entries for the same
7696 literal will be contiguous. */
7699 relocations_reach (source_reloc *reloc,
7700 int remaining_relocs,
7701 const r_reloc *r_rel)
7703 bfd_vma from_offset, source_address, dest_address;
7707 if (!r_reloc_is_defined (r_rel))
7710 sec = r_reloc_get_section (r_rel);
7711 from_offset = reloc[0].r_rel.target_offset;
7713 for (i = 0; i < remaining_relocs; i++)
7715 if (reloc[i].r_rel.target_offset != from_offset)
7718 /* Ignore relocations that have been removed. */
7719 if (reloc[i].is_null)
7722 /* The original and new output section for these must be the same
7723 in order to coalesce. */
7724 if (r_reloc_get_section (&reloc[i].r_rel)->output_section
7725 != sec->output_section)
7728 /* Absolute literals in the same output section can always be
7730 if (reloc[i].is_abs_literal)
7733 /* A literal with no PC-relative relocations can be moved anywhere. */
7734 if (reloc[i].opnd != -1)
7736 /* Otherwise, check to see that it fits. */
7737 source_address = (reloc[i].source_sec->output_section->vma
7738 + reloc[i].source_sec->output_offset
7739 + reloc[i].r_rel.rela.r_offset);
7740 dest_address = (sec->output_section->vma
7741 + sec->output_offset
7742 + r_rel->target_offset);
7744 if (!pcrel_reloc_fits (reloc[i].opcode, reloc[i].opnd,
7745 source_address, dest_address))
7754 /* Move a literal to another literal location because it is
7755 the same as the other literal value. */
7758 coalesce_shared_literal (asection *sec,
7760 property_table_entry *prop_table,
7764 property_table_entry *entry;
7766 property_table_entry *the_add_entry;
7768 xtensa_relax_info *relax_info;
7770 relax_info = get_xtensa_relax_info (sec);
7774 entry = elf_xtensa_find_property_entry
7775 (prop_table, ptblsize, sec->vma + rel->r_rel.target_offset);
7776 if (entry && (entry->flags & XTENSA_PROP_INSN_NO_TRANSFORM))
7779 /* Mark that the literal will be coalesced. */
7780 add_removed_literal (&relax_info->removed_list, &rel->r_rel, &val_map->loc);
7782 text_action_add (&relax_info->action_list,
7783 ta_remove_literal, sec, rel->r_rel.target_offset, 4);
7785 /* If the section is 4-byte aligned, do not add fill. */
7786 if (sec->alignment_power > 2)
7788 int fill_extra_space;
7789 bfd_vma entry_sec_offset;
7792 entry_sec_offset = entry->address - sec->vma + entry->size;
7794 entry_sec_offset = rel->r_rel.target_offset + 4;
7796 /* If the literal range is at the end of the section,
7798 fill_extra_space = 0;
7799 the_add_entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
7801 if (the_add_entry && (the_add_entry->flags & XTENSA_PROP_UNREACHABLE))
7802 fill_extra_space = the_add_entry->size;
7804 fa = find_fill_action (&relax_info->action_list, sec, entry_sec_offset);
7805 removed_diff = compute_removed_action_diff (fa, sec, entry_sec_offset,
7806 -4, fill_extra_space);
7808 adjust_fill_action (fa, removed_diff);
7810 text_action_add (&relax_info->action_list,
7811 ta_fill, sec, entry_sec_offset, removed_diff);
7818 /* Move a literal to another location. This may actually increase the
7819 total amount of space used because of alignments so we need to do
7820 this carefully. Also, it may make a branch go out of range. */
7823 move_shared_literal (asection *sec,
7824 struct bfd_link_info *link_info,
7826 property_table_entry *prop_table,
7828 const r_reloc *target_loc,
7829 const literal_value *lit_value,
7830 section_cache_t *target_sec_cache)
7832 property_table_entry *the_add_entry, *src_entry, *target_entry = NULL;
7833 text_action *fa, *target_fa;
7835 xtensa_relax_info *relax_info, *target_relax_info;
7836 asection *target_sec;
7838 ebb_constraint ebb_table;
7839 bfd_boolean relocs_fit;
7841 /* If this routine always returns FALSE, the literals that cannot be
7842 coalesced will not be moved. */
7843 if (elf32xtensa_no_literal_movement)
7846 relax_info = get_xtensa_relax_info (sec);
7850 target_sec = r_reloc_get_section (target_loc);
7851 target_relax_info = get_xtensa_relax_info (target_sec);
7853 /* Literals to undefined sections may not be moved because they
7854 must report an error. */
7855 if (bfd_is_und_section (target_sec))
7858 src_entry = elf_xtensa_find_property_entry
7859 (prop_table, ptblsize, sec->vma + rel->r_rel.target_offset);
7861 if (!section_cache_section (target_sec_cache, target_sec, link_info))
7864 target_entry = elf_xtensa_find_property_entry
7865 (target_sec_cache->ptbl, target_sec_cache->pte_count,
7866 target_sec->vma + target_loc->target_offset);
7871 /* Make sure that we have not broken any branches. */
7874 init_ebb_constraint (&ebb_table);
7875 ebb = &ebb_table.ebb;
7876 init_ebb (ebb, target_sec_cache->sec, target_sec_cache->contents,
7877 target_sec_cache->content_length,
7878 target_sec_cache->ptbl, target_sec_cache->pte_count,
7879 target_sec_cache->relocs, target_sec_cache->reloc_count);
7881 /* Propose to add 4 bytes + worst-case alignment size increase to
7883 ebb_propose_action (&ebb_table, EBB_NO_ALIGN, 0,
7884 ta_fill, target_loc->target_offset,
7885 -4 - (1 << target_sec->alignment_power), TRUE);
7887 /* Check all of the PC-relative relocations to make sure they still fit. */
7888 relocs_fit = check_section_ebb_pcrels_fit (target_sec->owner, target_sec,
7889 target_sec_cache->contents,
7890 target_sec_cache->relocs,
7896 text_action_add_literal (&target_relax_info->action_list,
7897 ta_add_literal, target_loc, lit_value, -4);
7899 if (target_sec->alignment_power > 2 && target_entry != src_entry)
7901 /* May need to add or remove some fill to maintain alignment. */
7902 int fill_extra_space;
7903 bfd_vma entry_sec_offset;
7906 target_entry->address - target_sec->vma + target_entry->size;
7908 /* If the literal range is at the end of the section,
7910 fill_extra_space = 0;
7912 elf_xtensa_find_property_entry (target_sec_cache->ptbl,
7913 target_sec_cache->pte_count,
7915 if (the_add_entry && (the_add_entry->flags & XTENSA_PROP_UNREACHABLE))
7916 fill_extra_space = the_add_entry->size;
7918 target_fa = find_fill_action (&target_relax_info->action_list,
7919 target_sec, entry_sec_offset);
7920 removed_diff = compute_removed_action_diff (target_fa, target_sec,
7921 entry_sec_offset, 4,
7924 adjust_fill_action (target_fa, removed_diff);
7926 text_action_add (&target_relax_info->action_list,
7927 ta_fill, target_sec, entry_sec_offset, removed_diff);
7930 /* Mark that the literal will be moved to the new location. */
7931 add_removed_literal (&relax_info->removed_list, &rel->r_rel, target_loc);
7933 /* Remove the literal. */
7934 text_action_add (&relax_info->action_list,
7935 ta_remove_literal, sec, rel->r_rel.target_offset, 4);
7937 /* If the section is 4-byte aligned, do not add fill. */
7938 if (sec->alignment_power > 2 && target_entry != src_entry)
7940 int fill_extra_space;
7941 bfd_vma entry_sec_offset;
7944 entry_sec_offset = src_entry->address - sec->vma + src_entry->size;
7946 entry_sec_offset = rel->r_rel.target_offset+4;
7948 /* If the literal range is at the end of the section,
7950 fill_extra_space = 0;
7951 the_add_entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
7953 if (the_add_entry && (the_add_entry->flags & XTENSA_PROP_UNREACHABLE))
7954 fill_extra_space = the_add_entry->size;
7956 fa = find_fill_action (&relax_info->action_list, sec, entry_sec_offset);
7957 removed_diff = compute_removed_action_diff (fa, sec, entry_sec_offset,
7958 -4, fill_extra_space);
7960 adjust_fill_action (fa, removed_diff);
7962 text_action_add (&relax_info->action_list,
7963 ta_fill, sec, entry_sec_offset, removed_diff);
7970 /* Second relaxation pass. */
7972 /* Modify all of the relocations to point to the right spot, and if this
7973 is a relaxable section, delete the unwanted literals and fix the
7977 relax_section (bfd *abfd, asection *sec, struct bfd_link_info *link_info)
7979 Elf_Internal_Rela *internal_relocs;
7980 xtensa_relax_info *relax_info;
7982 bfd_boolean ok = TRUE;
7984 bfd_boolean rv = FALSE;
7985 bfd_boolean virtual_action;
7986 bfd_size_type sec_size;
7988 sec_size = bfd_get_section_limit (abfd, sec);
7989 relax_info = get_xtensa_relax_info (sec);
7990 BFD_ASSERT (relax_info);
7992 /* First translate any of the fixes that have been added already. */
7993 translate_section_fixes (sec);
7995 /* Handle property sections (e.g., literal tables) specially. */
7996 if (xtensa_is_property_section (sec))
7998 BFD_ASSERT (!relax_info->is_relaxable_literal_section);
7999 return relax_property_section (abfd, sec, link_info);
8002 internal_relocs = retrieve_internal_relocs (abfd, sec,
8003 link_info->keep_memory);
8004 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
8005 if (contents == NULL && sec_size != 0)
8011 if (internal_relocs)
8013 for (i = 0; i < sec->reloc_count; i++)
8015 Elf_Internal_Rela *irel;
8016 xtensa_relax_info *target_relax_info;
8017 bfd_vma source_offset, old_source_offset;
8020 asection *target_sec;
8022 /* Locally change the source address.
8023 Translate the target to the new target address.
8024 If it points to this section and has been removed,
8028 irel = &internal_relocs[i];
8029 source_offset = irel->r_offset;
8030 old_source_offset = source_offset;
8032 r_type = ELF32_R_TYPE (irel->r_info);
8033 r_reloc_init (&r_rel, abfd, irel, contents,
8034 bfd_get_section_limit (abfd, sec));
8036 /* If this section could have changed then we may need to
8037 change the relocation's offset. */
8039 if (relax_info->is_relaxable_literal_section
8040 || relax_info->is_relaxable_asm_section)
8042 if (r_type != R_XTENSA_NONE
8043 && find_removed_literal (&relax_info->removed_list,
8046 /* Remove this relocation. */
8047 if (elf_hash_table (link_info)->dynamic_sections_created)
8048 shrink_dynamic_reloc_sections (link_info, abfd, sec, irel);
8049 irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
8050 irel->r_offset = offset_with_removed_text
8051 (&relax_info->action_list, irel->r_offset);
8052 pin_internal_relocs (sec, internal_relocs);
8056 if (r_type == R_XTENSA_ASM_SIMPLIFY)
8058 text_action *action =
8059 find_insn_action (&relax_info->action_list,
8061 if (action && (action->action == ta_convert_longcall
8062 || action->action == ta_remove_longcall))
8064 bfd_reloc_status_type retval;
8065 char *error_message = NULL;
8067 retval = contract_asm_expansion (contents, sec_size,
8068 irel, &error_message);
8069 if (retval != bfd_reloc_ok)
8071 (*link_info->callbacks->reloc_dangerous)
8072 (link_info, error_message, abfd, sec,
8076 /* Update the action so that the code that moves
8077 the contents will do the right thing. */
8078 if (action->action == ta_remove_longcall)
8079 action->action = ta_remove_insn;
8081 action->action = ta_none;
8082 /* Refresh the info in the r_rel. */
8083 r_reloc_init (&r_rel, abfd, irel, contents, sec_size);
8084 r_type = ELF32_R_TYPE (irel->r_info);
8088 source_offset = offset_with_removed_text
8089 (&relax_info->action_list, irel->r_offset);
8090 irel->r_offset = source_offset;
8093 /* If the target section could have changed then
8094 we may need to change the relocation's target offset. */
8096 target_sec = r_reloc_get_section (&r_rel);
8097 target_relax_info = get_xtensa_relax_info (target_sec);
8099 if (target_relax_info
8100 && (target_relax_info->is_relaxable_literal_section
8101 || target_relax_info->is_relaxable_asm_section))
8105 bfd_vma addend_displacement;
8107 translate_reloc (&r_rel, &new_reloc);
8109 if (r_type == R_XTENSA_DIFF8
8110 || r_type == R_XTENSA_DIFF16
8111 || r_type == R_XTENSA_DIFF32)
8113 bfd_vma diff_value = 0, new_end_offset, diff_mask = 0;
8115 if (bfd_get_section_limit (abfd, sec) < old_source_offset)
8117 (*link_info->callbacks->reloc_dangerous)
8118 (link_info, _("invalid relocation address"),
8119 abfd, sec, old_source_offset);
8125 case R_XTENSA_DIFF8:
8127 bfd_get_8 (abfd, &contents[old_source_offset]);
8129 case R_XTENSA_DIFF16:
8131 bfd_get_16 (abfd, &contents[old_source_offset]);
8133 case R_XTENSA_DIFF32:
8135 bfd_get_32 (abfd, &contents[old_source_offset]);
8139 new_end_offset = offset_with_removed_text
8140 (&target_relax_info->action_list,
8141 r_rel.target_offset + diff_value);
8142 diff_value = new_end_offset - new_reloc.target_offset;
8146 case R_XTENSA_DIFF8:
8148 bfd_put_8 (abfd, diff_value,
8149 &contents[old_source_offset]);
8151 case R_XTENSA_DIFF16:
8153 bfd_put_16 (abfd, diff_value,
8154 &contents[old_source_offset]);
8156 case R_XTENSA_DIFF32:
8157 diff_mask = 0xffffffff;
8158 bfd_put_32 (abfd, diff_value,
8159 &contents[old_source_offset]);
8163 /* Check for overflow. */
8164 if ((diff_value & ~diff_mask) != 0)
8166 (*link_info->callbacks->reloc_dangerous)
8167 (link_info, _("overflow after relaxation"),
8168 abfd, sec, old_source_offset);
8172 pin_contents (sec, contents);
8175 /* FIXME: If the relocation still references a section in
8176 the same input file, the relocation should be modified
8177 directly instead of adding a "fix" record. */
8179 addend_displacement =
8180 new_reloc.target_offset + new_reloc.virtual_offset;
8182 fix = reloc_bfd_fix_init (sec, source_offset, r_type, 0,
8183 r_reloc_get_section (&new_reloc),
8184 addend_displacement, TRUE);
8188 pin_internal_relocs (sec, internal_relocs);
8192 if ((relax_info->is_relaxable_literal_section
8193 || relax_info->is_relaxable_asm_section)
8194 && relax_info->action_list.head)
8196 /* Walk through the planned actions and build up a table
8197 of move, copy and fill records. Use the move, copy and
8198 fill records to perform the actions once. */
8200 bfd_size_type size = sec->size;
8202 bfd_size_type final_size, copy_size, orig_insn_size;
8203 bfd_byte *scratch = NULL;
8204 bfd_byte *dup_contents = NULL;
8205 bfd_size_type orig_size = size;
8206 bfd_vma orig_dot = 0;
8207 bfd_vma orig_dot_copied = 0; /* Byte copied already from
8208 orig dot in physical memory. */
8209 bfd_vma orig_dot_vo = 0; /* Virtual offset from orig_dot. */
8210 bfd_vma dup_dot = 0;
8212 text_action *action = relax_info->action_list.head;
8214 final_size = sec->size;
8215 for (action = relax_info->action_list.head; action;
8216 action = action->next)
8218 final_size -= action->removed_bytes;
8221 scratch = (bfd_byte *) bfd_zmalloc (final_size);
8222 dup_contents = (bfd_byte *) bfd_zmalloc (final_size);
8224 /* The dot is the current fill location. */
8226 print_action_list (stderr, &relax_info->action_list);
8229 for (action = relax_info->action_list.head; action;
8230 action = action->next)
8232 virtual_action = FALSE;
8233 if (action->offset > orig_dot)
8235 orig_dot += orig_dot_copied;
8236 orig_dot_copied = 0;
8238 /* Out of the virtual world. */
8241 if (action->offset > orig_dot)
8243 copy_size = action->offset - orig_dot;
8244 memmove (&dup_contents[dup_dot], &contents[orig_dot], copy_size);
8245 orig_dot += copy_size;
8246 dup_dot += copy_size;
8247 BFD_ASSERT (action->offset == orig_dot);
8249 else if (action->offset < orig_dot)
8251 if (action->action == ta_fill
8252 && action->offset - action->removed_bytes == orig_dot)
8254 /* This is OK because the fill only effects the dup_dot. */
8256 else if (action->action == ta_add_literal)
8258 /* TBD. Might need to handle this. */
8261 if (action->offset == orig_dot)
8263 if (action->virtual_offset > orig_dot_vo)
8265 if (orig_dot_vo == 0)
8267 /* Need to copy virtual_offset bytes. Probably four. */
8268 copy_size = action->virtual_offset - orig_dot_vo;
8269 memmove (&dup_contents[dup_dot],
8270 &contents[orig_dot], copy_size);
8271 orig_dot_copied = copy_size;
8272 dup_dot += copy_size;
8274 virtual_action = TRUE;
8277 BFD_ASSERT (action->virtual_offset <= orig_dot_vo);
8279 switch (action->action)
8281 case ta_remove_literal:
8282 case ta_remove_insn:
8283 BFD_ASSERT (action->removed_bytes >= 0);
8284 orig_dot += action->removed_bytes;
8287 case ta_narrow_insn:
8290 memmove (scratch, &contents[orig_dot], orig_insn_size);
8291 BFD_ASSERT (action->removed_bytes == 1);
8292 rv = narrow_instruction (scratch, final_size, 0);
8294 memmove (&dup_contents[dup_dot], scratch, copy_size);
8295 orig_dot += orig_insn_size;
8296 dup_dot += copy_size;
8300 if (action->removed_bytes >= 0)
8301 orig_dot += action->removed_bytes;
8304 /* Already zeroed in dup_contents. Just bump the
8306 dup_dot += (-action->removed_bytes);
8311 BFD_ASSERT (action->removed_bytes == 0);
8314 case ta_convert_longcall:
8315 case ta_remove_longcall:
8316 /* These will be removed or converted before we get here. */
8323 memmove (scratch, &contents[orig_dot], orig_insn_size);
8324 BFD_ASSERT (action->removed_bytes == -1);
8325 rv = widen_instruction (scratch, final_size, 0);
8327 memmove (&dup_contents[dup_dot], scratch, copy_size);
8328 orig_dot += orig_insn_size;
8329 dup_dot += copy_size;
8332 case ta_add_literal:
8335 BFD_ASSERT (action->removed_bytes == -4);
8336 /* TBD -- place the literal value here and insert
8338 memset (&dup_contents[dup_dot], 0, 4);
8339 pin_internal_relocs (sec, internal_relocs);
8340 pin_contents (sec, contents);
8342 if (!move_literal (abfd, link_info, sec, dup_dot, dup_contents,
8343 relax_info, &internal_relocs, &action->value))
8347 orig_dot_vo += copy_size;
8349 orig_dot += orig_insn_size;
8350 dup_dot += copy_size;
8354 /* Not implemented yet. */
8359 size -= action->removed_bytes;
8360 removed += action->removed_bytes;
8361 BFD_ASSERT (dup_dot <= final_size);
8362 BFD_ASSERT (orig_dot <= orig_size);
8365 orig_dot += orig_dot_copied;
8366 orig_dot_copied = 0;
8368 if (orig_dot != orig_size)
8370 copy_size = orig_size - orig_dot;
8371 BFD_ASSERT (orig_size > orig_dot);
8372 BFD_ASSERT (dup_dot + copy_size == final_size);
8373 memmove (&dup_contents[dup_dot], &contents[orig_dot], copy_size);
8374 orig_dot += copy_size;
8375 dup_dot += copy_size;
8377 BFD_ASSERT (orig_size == orig_dot);
8378 BFD_ASSERT (final_size == dup_dot);
8380 /* Move the dup_contents back. */
8381 if (final_size > orig_size)
8383 /* Contents need to be reallocated. Swap the dup_contents into
8385 sec->contents = dup_contents;
8387 contents = dup_contents;
8388 pin_contents (sec, contents);
8392 BFD_ASSERT (final_size <= orig_size);
8393 memset (contents, 0, orig_size);
8394 memcpy (contents, dup_contents, final_size);
8395 free (dup_contents);
8398 pin_contents (sec, contents);
8400 sec->size = final_size;
8404 release_internal_relocs (sec, internal_relocs);
8405 release_contents (sec, contents);
8411 translate_section_fixes (asection *sec)
8413 xtensa_relax_info *relax_info;
8416 relax_info = get_xtensa_relax_info (sec);
8420 for (r = relax_info->fix_list; r != NULL; r = r->next)
8421 if (!translate_reloc_bfd_fix (r))
8428 /* Translate a fix given the mapping in the relax info for the target
8429 section. If it has already been translated, no work is required. */
8432 translate_reloc_bfd_fix (reloc_bfd_fix *fix)
8434 reloc_bfd_fix new_fix;
8436 xtensa_relax_info *relax_info;
8437 removed_literal *removed;
8438 bfd_vma new_offset, target_offset;
8440 if (fix->translated)
8443 sec = fix->target_sec;
8444 target_offset = fix->target_offset;
8446 relax_info = get_xtensa_relax_info (sec);
8449 fix->translated = TRUE;
8455 /* The fix does not need to be translated if the section cannot change. */
8456 if (!relax_info->is_relaxable_literal_section
8457 && !relax_info->is_relaxable_asm_section)
8459 fix->translated = TRUE;
8463 /* If the literal has been moved and this relocation was on an
8464 opcode, then the relocation should move to the new literal
8465 location. Otherwise, the relocation should move within the
8469 if (is_operand_relocation (fix->src_type))
8471 /* Check if the original relocation is against a literal being
8473 removed = find_removed_literal (&relax_info->removed_list,
8481 /* The fact that there is still a relocation to this literal indicates
8482 that the literal is being coalesced, not simply removed. */
8483 BFD_ASSERT (removed->to.abfd != NULL);
8485 /* This was moved to some other address (possibly another section). */
8486 new_sec = r_reloc_get_section (&removed->to);
8490 relax_info = get_xtensa_relax_info (sec);
8492 (!relax_info->is_relaxable_literal_section
8493 && !relax_info->is_relaxable_asm_section))
8495 target_offset = removed->to.target_offset;
8496 new_fix.target_sec = new_sec;
8497 new_fix.target_offset = target_offset;
8498 new_fix.translated = TRUE;
8503 target_offset = removed->to.target_offset;
8504 new_fix.target_sec = new_sec;
8507 /* The target address may have been moved within its section. */
8508 new_offset = offset_with_removed_text (&relax_info->action_list,
8511 new_fix.target_offset = new_offset;
8512 new_fix.target_offset = new_offset;
8513 new_fix.translated = TRUE;
8519 /* Fix up a relocation to take account of removed literals. */
8522 translate_reloc (const r_reloc *orig_rel, r_reloc *new_rel)
8525 xtensa_relax_info *relax_info;
8526 removed_literal *removed;
8527 bfd_vma new_offset, target_offset, removed_bytes;
8529 *new_rel = *orig_rel;
8531 if (!r_reloc_is_defined (orig_rel))
8533 sec = r_reloc_get_section (orig_rel);
8535 relax_info = get_xtensa_relax_info (sec);
8536 BFD_ASSERT (relax_info);
8538 if (!relax_info->is_relaxable_literal_section
8539 && !relax_info->is_relaxable_asm_section)
8542 target_offset = orig_rel->target_offset;
8545 if (is_operand_relocation (ELF32_R_TYPE (orig_rel->rela.r_info)))
8547 /* Check if the original relocation is against a literal being
8549 removed = find_removed_literal (&relax_info->removed_list,
8552 if (removed && removed->to.abfd)
8556 /* The fact that there is still a relocation to this literal indicates
8557 that the literal is being coalesced, not simply removed. */
8558 BFD_ASSERT (removed->to.abfd != NULL);
8560 /* This was moved to some other address
8561 (possibly in another section). */
8562 *new_rel = removed->to;
8563 new_sec = r_reloc_get_section (new_rel);
8567 relax_info = get_xtensa_relax_info (sec);
8569 || (!relax_info->is_relaxable_literal_section
8570 && !relax_info->is_relaxable_asm_section))
8573 target_offset = new_rel->target_offset;
8576 /* ...and the target address may have been moved within its section. */
8577 new_offset = offset_with_removed_text (&relax_info->action_list,
8580 /* Modify the offset and addend. */
8581 removed_bytes = target_offset - new_offset;
8582 new_rel->target_offset = new_offset;
8583 new_rel->rela.r_addend -= removed_bytes;
8587 /* For dynamic links, there may be a dynamic relocation for each
8588 literal. The number of dynamic relocations must be computed in
8589 size_dynamic_sections, which occurs before relaxation. When a
8590 literal is removed, this function checks if there is a corresponding
8591 dynamic relocation and shrinks the size of the appropriate dynamic
8592 relocation section accordingly. At this point, the contents of the
8593 dynamic relocation sections have not yet been filled in, so there's
8594 nothing else that needs to be done. */
8597 shrink_dynamic_reloc_sections (struct bfd_link_info *info,
8599 asection *input_section,
8600 Elf_Internal_Rela *rel)
8602 Elf_Internal_Shdr *symtab_hdr;
8603 struct elf_link_hash_entry **sym_hashes;
8604 unsigned long r_symndx;
8606 struct elf_link_hash_entry *h;
8607 bfd_boolean dynamic_symbol;
8609 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
8610 sym_hashes = elf_sym_hashes (abfd);
8612 r_type = ELF32_R_TYPE (rel->r_info);
8613 r_symndx = ELF32_R_SYM (rel->r_info);
8615 if (r_symndx < symtab_hdr->sh_info)
8618 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
8620 dynamic_symbol = xtensa_elf_dynamic_symbol_p (h, info);
8622 if ((r_type == R_XTENSA_32 || r_type == R_XTENSA_PLT)
8623 && (input_section->flags & SEC_ALLOC) != 0
8624 && (dynamic_symbol || info->shared))
8627 const char *srel_name;
8629 bfd_boolean is_plt = FALSE;
8631 dynobj = elf_hash_table (info)->dynobj;
8632 BFD_ASSERT (dynobj != NULL);
8634 if (dynamic_symbol && r_type == R_XTENSA_PLT)
8636 srel_name = ".rela.plt";
8640 srel_name = ".rela.got";
8642 /* Reduce size of the .rela.* section by one reloc. */
8643 srel = bfd_get_section_by_name (dynobj, srel_name);
8644 BFD_ASSERT (srel != NULL);
8645 BFD_ASSERT (srel->size >= sizeof (Elf32_External_Rela));
8646 srel->size -= sizeof (Elf32_External_Rela);
8650 asection *splt, *sgotplt, *srelgot;
8651 int reloc_index, chunk;
8653 /* Find the PLT reloc index of the entry being removed. This
8654 is computed from the size of ".rela.plt". It is needed to
8655 figure out which PLT chunk to resize. Usually "last index
8656 = size - 1" since the index starts at zero, but in this
8657 context, the size has just been decremented so there's no
8658 need to subtract one. */
8659 reloc_index = srel->size / sizeof (Elf32_External_Rela);
8661 chunk = reloc_index / PLT_ENTRIES_PER_CHUNK;
8662 splt = elf_xtensa_get_plt_section (dynobj, chunk);
8663 sgotplt = elf_xtensa_get_gotplt_section (dynobj, chunk);
8664 BFD_ASSERT (splt != NULL && sgotplt != NULL);
8666 /* Check if an entire PLT chunk has just been eliminated. */
8667 if (reloc_index % PLT_ENTRIES_PER_CHUNK == 0)
8669 /* The two magic GOT entries for that chunk can go away. */
8670 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
8671 BFD_ASSERT (srelgot != NULL);
8672 srelgot->reloc_count -= 2;
8673 srelgot->size -= 2 * sizeof (Elf32_External_Rela);
8676 /* There should be only one entry left (and it will be
8678 BFD_ASSERT (sgotplt->size == 4);
8679 BFD_ASSERT (splt->size == PLT_ENTRY_SIZE);
8682 BFD_ASSERT (sgotplt->size >= 4);
8683 BFD_ASSERT (splt->size >= PLT_ENTRY_SIZE);
8686 splt->size -= PLT_ENTRY_SIZE;
8692 /* Take an r_rel and move it to another section. This usually
8693 requires extending the interal_relocation array and pinning it. If
8694 the original r_rel is from the same BFD, we can complete this here.
8695 Otherwise, we add a fix record to let the final link fix the
8696 appropriate address. Contents and internal relocations for the
8697 section must be pinned after calling this routine. */
8700 move_literal (bfd *abfd,
8701 struct bfd_link_info *link_info,
8705 xtensa_relax_info *relax_info,
8706 Elf_Internal_Rela **internal_relocs_p,
8707 const literal_value *lit)
8709 Elf_Internal_Rela *new_relocs = NULL;
8710 size_t new_relocs_count = 0;
8711 Elf_Internal_Rela this_rela;
8712 const r_reloc *r_rel;
8714 r_rel = &lit->r_rel;
8715 BFD_ASSERT (elf_section_data (sec)->relocs == *internal_relocs_p);
8717 if (r_reloc_is_const (r_rel))
8718 bfd_put_32 (abfd, lit->value, contents + offset);
8723 asection *target_sec;
8727 r_type = ELF32_R_TYPE (r_rel->rela.r_info);
8728 target_sec = r_reloc_get_section (r_rel);
8730 /* This is the difficult case. We have to create a fix up. */
8731 this_rela.r_offset = offset;
8732 this_rela.r_info = ELF32_R_INFO (0, r_type);
8733 this_rela.r_addend =
8734 r_rel->target_offset - r_reloc_get_target_offset (r_rel);
8735 bfd_put_32 (abfd, lit->value, contents + offset);
8737 /* Currently, we cannot move relocations during a relocatable link. */
8738 BFD_ASSERT (!link_info->relocatable);
8739 fix = reloc_bfd_fix_init (sec, offset, r_type, r_rel->abfd,
8740 r_reloc_get_section (r_rel),
8741 r_rel->target_offset + r_rel->virtual_offset,
8743 /* We also need to mark that relocations are needed here. */
8744 sec->flags |= SEC_RELOC;
8746 translate_reloc_bfd_fix (fix);
8747 /* This fix has not yet been translated. */
8750 /* Add the relocation. If we have already allocated our own
8751 space for the relocations and we have room for more, then use
8752 it. Otherwise, allocate new space and move the literals. */
8753 insert_at = sec->reloc_count;
8754 for (i = 0; i < sec->reloc_count; ++i)
8756 if (this_rela.r_offset < (*internal_relocs_p)[i].r_offset)
8763 if (*internal_relocs_p != relax_info->allocated_relocs
8764 || sec->reloc_count + 1 > relax_info->allocated_relocs_count)
8766 BFD_ASSERT (relax_info->allocated_relocs == NULL
8767 || sec->reloc_count == relax_info->relocs_count);
8769 if (relax_info->allocated_relocs_count == 0)
8770 new_relocs_count = (sec->reloc_count + 2) * 2;
8772 new_relocs_count = (relax_info->allocated_relocs_count + 2) * 2;
8774 new_relocs = (Elf_Internal_Rela *)
8775 bfd_zmalloc (sizeof (Elf_Internal_Rela) * (new_relocs_count));
8779 /* We could handle this more quickly by finding the split point. */
8781 memcpy (new_relocs, *internal_relocs_p,
8782 insert_at * sizeof (Elf_Internal_Rela));
8784 new_relocs[insert_at] = this_rela;
8786 if (insert_at != sec->reloc_count)
8787 memcpy (new_relocs + insert_at + 1,
8788 (*internal_relocs_p) + insert_at,
8789 (sec->reloc_count - insert_at)
8790 * sizeof (Elf_Internal_Rela));
8792 if (*internal_relocs_p != relax_info->allocated_relocs)
8794 /* The first time we re-allocate, we can only free the
8795 old relocs if they were allocated with bfd_malloc.
8796 This is not true when keep_memory is in effect. */
8797 if (!link_info->keep_memory)
8798 free (*internal_relocs_p);
8801 free (*internal_relocs_p);
8802 relax_info->allocated_relocs = new_relocs;
8803 relax_info->allocated_relocs_count = new_relocs_count;
8804 elf_section_data (sec)->relocs = new_relocs;
8806 relax_info->relocs_count = sec->reloc_count;
8807 *internal_relocs_p = new_relocs;
8811 if (insert_at != sec->reloc_count)
8814 for (idx = sec->reloc_count; idx > insert_at; idx--)
8815 (*internal_relocs_p)[idx] = (*internal_relocs_p)[idx-1];
8817 (*internal_relocs_p)[insert_at] = this_rela;
8819 if (relax_info->allocated_relocs)
8820 relax_info->relocs_count = sec->reloc_count;
8827 /* This is similar to relax_section except that when a target is moved,
8828 we shift addresses up. We also need to modify the size. This
8829 algorithm does NOT allow for relocations into the middle of the
8830 property sections. */
8833 relax_property_section (bfd *abfd,
8835 struct bfd_link_info *link_info)
8837 Elf_Internal_Rela *internal_relocs;
8840 bfd_boolean ok = TRUE;
8841 bfd_boolean is_full_prop_section;
8842 size_t last_zfill_target_offset = 0;
8843 asection *last_zfill_target_sec = NULL;
8844 bfd_size_type sec_size;
8846 sec_size = bfd_get_section_limit (abfd, sec);
8847 internal_relocs = retrieve_internal_relocs (abfd, sec,
8848 link_info->keep_memory);
8849 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
8850 if (contents == NULL && sec_size != 0)
8856 is_full_prop_section =
8857 ((strncmp (sec->name, XTENSA_PROP_SEC_NAME,
8858 sizeof (XTENSA_PROP_SEC_NAME) - 1) == 0)
8859 || (strncmp (sec->name, ".gnu.linkonce.prop.",
8860 sizeof ".gnu.linkonce.prop." - 1) == 0));
8862 if (internal_relocs)
8864 for (i = 0; i < sec->reloc_count; i++)
8866 Elf_Internal_Rela *irel;
8867 xtensa_relax_info *target_relax_info;
8869 asection *target_sec;
8871 bfd_byte *size_p, *flags_p;
8873 /* Locally change the source address.
8874 Translate the target to the new target address.
8875 If it points to this section and has been removed, MOVE IT.
8876 Also, don't forget to modify the associated SIZE at
8879 irel = &internal_relocs[i];
8880 r_type = ELF32_R_TYPE (irel->r_info);
8881 if (r_type == R_XTENSA_NONE)
8884 /* Find the literal value. */
8885 r_reloc_init (&val.r_rel, abfd, irel, contents, sec_size);
8886 size_p = &contents[irel->r_offset + 4];
8888 if (is_full_prop_section)
8890 flags_p = &contents[irel->r_offset + 8];
8891 BFD_ASSERT (irel->r_offset + 12 <= sec_size);
8894 BFD_ASSERT (irel->r_offset + 8 <= sec_size);
8896 target_sec = r_reloc_get_section (&val.r_rel);
8897 target_relax_info = get_xtensa_relax_info (target_sec);
8899 if (target_relax_info
8900 && (target_relax_info->is_relaxable_literal_section
8901 || target_relax_info->is_relaxable_asm_section ))
8903 /* Translate the relocation's destination. */
8904 bfd_vma new_offset, new_end_offset;
8905 long old_size, new_size;
8907 new_offset = offset_with_removed_text
8908 (&target_relax_info->action_list, val.r_rel.target_offset);
8910 /* Assert that we are not out of bounds. */
8911 old_size = bfd_get_32 (abfd, size_p);
8915 /* Only the first zero-sized unreachable entry is
8916 allowed to expand. In this case the new offset
8917 should be the offset before the fill and the new
8918 size is the expansion size. For other zero-sized
8919 entries the resulting size should be zero with an
8920 offset before or after the fill address depending
8921 on whether the expanding unreachable entry
8923 if (last_zfill_target_sec
8924 && last_zfill_target_sec == target_sec
8925 && last_zfill_target_offset == val.r_rel.target_offset)
8926 new_end_offset = new_offset;
8929 new_end_offset = new_offset;
8930 new_offset = offset_with_removed_text_before_fill
8931 (&target_relax_info->action_list,
8932 val.r_rel.target_offset);
8934 /* If it is not unreachable and we have not yet
8935 seen an unreachable at this address, place it
8936 before the fill address. */
8938 || (bfd_get_32 (abfd, flags_p)
8939 & XTENSA_PROP_UNREACHABLE) == 0)
8940 new_end_offset = new_offset;
8943 last_zfill_target_sec = target_sec;
8944 last_zfill_target_offset = val.r_rel.target_offset;
8950 new_end_offset = offset_with_removed_text_before_fill
8951 (&target_relax_info->action_list,
8952 val.r_rel.target_offset + old_size);
8955 new_size = new_end_offset - new_offset;
8957 if (new_size != old_size)
8959 bfd_put_32 (abfd, new_size, size_p);
8960 pin_contents (sec, contents);
8963 if (new_offset != val.r_rel.target_offset)
8965 bfd_vma diff = new_offset - val.r_rel.target_offset;
8966 irel->r_addend += diff;
8967 pin_internal_relocs (sec, internal_relocs);
8973 /* Combine adjacent property table entries. This is also done in
8974 finish_dynamic_sections() but at that point it's too late to
8975 reclaim the space in the output section, so we do this twice. */
8977 if (internal_relocs && (!link_info->relocatable
8978 || strcmp (sec->name, XTENSA_LIT_SEC_NAME) == 0))
8980 Elf_Internal_Rela *last_irel = NULL;
8981 int removed_bytes = 0;
8982 bfd_vma offset, last_irel_offset;
8983 bfd_vma section_size;
8984 bfd_size_type entry_size;
8985 flagword predef_flags;
8987 if (is_full_prop_section)
8992 predef_flags = xtensa_get_property_predef_flags (sec);
8994 /* Walk over memory and irels at the same time.
8995 This REQUIRES that the internal_relocs be sorted by offset. */
8996 qsort (internal_relocs, sec->reloc_count, sizeof (Elf_Internal_Rela),
8997 internal_reloc_compare);
8998 nexti = 0; /* Index into internal_relocs. */
9000 pin_internal_relocs (sec, internal_relocs);
9001 pin_contents (sec, contents);
9003 last_irel_offset = (bfd_vma) -1;
9004 section_size = sec->size;
9005 BFD_ASSERT (section_size % entry_size == 0);
9007 for (offset = 0; offset < section_size; offset += entry_size)
9009 Elf_Internal_Rela *irel, *next_irel;
9010 bfd_vma bytes_to_remove, size, actual_offset;
9011 bfd_boolean remove_this_irel;
9017 /* Find the next two relocations (if there are that many left),
9018 skipping over any R_XTENSA_NONE relocs. On entry, "nexti" is
9019 the starting reloc index. After these two loops, "i"
9020 is the index of the first non-NONE reloc past that starting
9021 index, and "nexti" is the index for the next non-NONE reloc
9024 for (i = nexti; i < sec->reloc_count; i++)
9026 if (ELF32_R_TYPE (internal_relocs[i].r_info) != R_XTENSA_NONE)
9028 irel = &internal_relocs[i];
9031 internal_relocs[i].r_offset -= removed_bytes;
9034 for (nexti = i + 1; nexti < sec->reloc_count; nexti++)
9036 if (ELF32_R_TYPE (internal_relocs[nexti].r_info)
9039 next_irel = &internal_relocs[nexti];
9042 internal_relocs[nexti].r_offset -= removed_bytes;
9045 remove_this_irel = FALSE;
9046 bytes_to_remove = 0;
9047 actual_offset = offset - removed_bytes;
9048 size = bfd_get_32 (abfd, &contents[actual_offset + 4]);
9050 if (is_full_prop_section)
9051 flags = bfd_get_32 (abfd, &contents[actual_offset + 8]);
9053 flags = predef_flags;
9055 /* Check that the irels are sorted by offset,
9056 with only one per address. */
9057 BFD_ASSERT (!irel || (int) irel->r_offset > (int) last_irel_offset);
9058 BFD_ASSERT (!next_irel || next_irel->r_offset > irel->r_offset);
9060 /* Make sure there aren't relocs on the size or flag fields. */
9061 if ((irel && irel->r_offset == offset + 4)
9062 || (is_full_prop_section
9063 && irel && irel->r_offset == offset + 8))
9065 irel->r_offset -= removed_bytes;
9066 last_irel_offset = irel->r_offset;
9068 else if (next_irel && (next_irel->r_offset == offset + 4
9069 || (is_full_prop_section
9070 && next_irel->r_offset == offset + 8)))
9073 irel->r_offset -= removed_bytes;
9074 next_irel->r_offset -= removed_bytes;
9075 last_irel_offset = next_irel->r_offset;
9077 else if (size == 0 && (flags & XTENSA_PROP_ALIGN) == 0
9078 && (flags & XTENSA_PROP_UNREACHABLE) == 0)
9080 /* Always remove entries with zero size and no alignment. */
9081 bytes_to_remove = entry_size;
9082 if (irel && irel->r_offset == offset)
9084 remove_this_irel = TRUE;
9086 irel->r_offset -= removed_bytes;
9087 last_irel_offset = irel->r_offset;
9090 else if (irel && irel->r_offset == offset)
9092 if (ELF32_R_TYPE (irel->r_info) == R_XTENSA_32)
9098 bfd_get_32 (abfd, &contents[last_irel->r_offset + 4]);
9099 bfd_vma old_address =
9100 (last_irel->r_addend
9101 + bfd_get_32 (abfd, &contents[last_irel->r_offset]));
9102 bfd_vma new_address =
9104 + bfd_get_32 (abfd, &contents[actual_offset]));
9105 if (is_full_prop_section)
9106 old_flags = bfd_get_32
9107 (abfd, &contents[last_irel->r_offset + 8]);
9109 old_flags = predef_flags;
9111 if ((ELF32_R_SYM (irel->r_info)
9112 == ELF32_R_SYM (last_irel->r_info))
9113 && old_address + old_size == new_address
9114 && old_flags == flags
9115 && (old_flags & XTENSA_PROP_INSN_BRANCH_TARGET) == 0
9116 && (old_flags & XTENSA_PROP_INSN_LOOP_TARGET) == 0)
9118 /* Fix the old size. */
9119 bfd_put_32 (abfd, old_size + size,
9120 &contents[last_irel->r_offset + 4]);
9121 bytes_to_remove = entry_size;
9122 remove_this_irel = TRUE;
9131 irel->r_offset -= removed_bytes;
9132 last_irel_offset = irel->r_offset;
9135 if (remove_this_irel)
9137 irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
9138 irel->r_offset -= bytes_to_remove;
9141 if (bytes_to_remove != 0)
9143 removed_bytes += bytes_to_remove;
9144 if (offset + bytes_to_remove < section_size)
9145 memmove (&contents[actual_offset],
9146 &contents[actual_offset + bytes_to_remove],
9147 section_size - offset - bytes_to_remove);
9153 /* Clear the removed bytes. */
9154 memset (&contents[section_size - removed_bytes], 0, removed_bytes);
9156 sec->size = section_size - removed_bytes;
9158 if (xtensa_is_littable_section (sec))
9160 bfd *dynobj = elf_hash_table (link_info)->dynobj;
9164 bfd_get_section_by_name (dynobj, ".got.loc");
9166 sgotloc->size -= removed_bytes;
9173 release_internal_relocs (sec, internal_relocs);
9174 release_contents (sec, contents);
9179 /* Third relaxation pass. */
9181 /* Change symbol values to account for removed literals. */
9184 relax_section_symbols (bfd *abfd, asection *sec)
9186 xtensa_relax_info *relax_info;
9187 unsigned int sec_shndx;
9188 Elf_Internal_Shdr *symtab_hdr;
9189 Elf_Internal_Sym *isymbuf;
9190 unsigned i, num_syms, num_locals;
9192 relax_info = get_xtensa_relax_info (sec);
9193 BFD_ASSERT (relax_info);
9195 if (!relax_info->is_relaxable_literal_section
9196 && !relax_info->is_relaxable_asm_section)
9199 sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
9201 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
9202 isymbuf = retrieve_local_syms (abfd);
9204 num_syms = symtab_hdr->sh_size / sizeof (Elf32_External_Sym);
9205 num_locals = symtab_hdr->sh_info;
9207 /* Adjust the local symbols defined in this section. */
9208 for (i = 0; i < num_locals; i++)
9210 Elf_Internal_Sym *isym = &isymbuf[i];
9212 if (isym->st_shndx == sec_shndx)
9214 bfd_vma new_address = offset_with_removed_text
9215 (&relax_info->action_list, isym->st_value);
9216 bfd_vma new_size = isym->st_size;
9218 if (ELF32_ST_TYPE (isym->st_info) == STT_FUNC)
9220 bfd_vma new_end = offset_with_removed_text
9221 (&relax_info->action_list, isym->st_value + isym->st_size);
9222 new_size = new_end - new_address;
9225 isym->st_value = new_address;
9226 isym->st_size = new_size;
9230 /* Now adjust the global symbols defined in this section. */
9231 for (i = 0; i < (num_syms - num_locals); i++)
9233 struct elf_link_hash_entry *sym_hash;
9235 sym_hash = elf_sym_hashes (abfd)[i];
9237 if (sym_hash->root.type == bfd_link_hash_warning)
9238 sym_hash = (struct elf_link_hash_entry *) sym_hash->root.u.i.link;
9240 if ((sym_hash->root.type == bfd_link_hash_defined
9241 || sym_hash->root.type == bfd_link_hash_defweak)
9242 && sym_hash->root.u.def.section == sec)
9244 bfd_vma new_address = offset_with_removed_text
9245 (&relax_info->action_list, sym_hash->root.u.def.value);
9246 bfd_vma new_size = sym_hash->size;
9248 if (sym_hash->type == STT_FUNC)
9250 bfd_vma new_end = offset_with_removed_text
9251 (&relax_info->action_list,
9252 sym_hash->root.u.def.value + sym_hash->size);
9253 new_size = new_end - new_address;
9256 sym_hash->root.u.def.value = new_address;
9257 sym_hash->size = new_size;
9265 /* "Fix" handling functions, called while performing relocations. */
9268 do_fix_for_relocatable_link (Elf_Internal_Rela *rel,
9270 asection *input_section,
9274 asection *sec, *old_sec;
9276 int r_type = ELF32_R_TYPE (rel->r_info);
9279 if (r_type == R_XTENSA_NONE)
9282 fix = get_bfd_fix (input_section, rel->r_offset, r_type);
9286 r_reloc_init (&r_rel, input_bfd, rel, contents,
9287 bfd_get_section_limit (input_bfd, input_section));
9288 old_sec = r_reloc_get_section (&r_rel);
9289 old_offset = r_rel.target_offset;
9291 if (!old_sec || !r_reloc_is_defined (&r_rel))
9293 if (r_type != R_XTENSA_ASM_EXPAND)
9295 (*_bfd_error_handler)
9296 (_("%B(%A+0x%lx): unexpected fix for %s relocation"),
9297 input_bfd, input_section, rel->r_offset,
9298 elf_howto_table[r_type].name);
9301 /* Leave it be. Resolution will happen in a later stage. */
9305 sec = fix->target_sec;
9306 rel->r_addend += ((sec->output_offset + fix->target_offset)
9307 - (old_sec->output_offset + old_offset));
9314 do_fix_for_final_link (Elf_Internal_Rela *rel,
9316 asection *input_section,
9318 bfd_vma *relocationp)
9321 int r_type = ELF32_R_TYPE (rel->r_info);
9325 if (r_type == R_XTENSA_NONE)
9328 fix = get_bfd_fix (input_section, rel->r_offset, r_type);
9332 sec = fix->target_sec;
9334 fixup_diff = rel->r_addend;
9335 if (elf_howto_table[fix->src_type].partial_inplace)
9337 bfd_vma inplace_val;
9338 BFD_ASSERT (fix->src_offset
9339 < bfd_get_section_limit (input_bfd, input_section));
9340 inplace_val = bfd_get_32 (input_bfd, &contents[fix->src_offset]);
9341 fixup_diff += inplace_val;
9344 *relocationp = (sec->output_section->vma
9345 + sec->output_offset
9346 + fix->target_offset - fixup_diff);
9350 /* Miscellaneous utility functions.... */
9353 elf_xtensa_get_plt_section (bfd *dynobj, int chunk)
9358 return bfd_get_section_by_name (dynobj, ".plt");
9360 sprintf (plt_name, ".plt.%u", chunk);
9361 return bfd_get_section_by_name (dynobj, plt_name);
9366 elf_xtensa_get_gotplt_section (bfd *dynobj, int chunk)
9371 return bfd_get_section_by_name (dynobj, ".got.plt");
9373 sprintf (got_name, ".got.plt.%u", chunk);
9374 return bfd_get_section_by_name (dynobj, got_name);
9378 /* Get the input section for a given symbol index.
9380 . a section symbol, return the section;
9381 . a common symbol, return the common section;
9382 . an undefined symbol, return the undefined section;
9383 . an indirect symbol, follow the links;
9384 . an absolute value, return the absolute section. */
9387 get_elf_r_symndx_section (bfd *abfd, unsigned long r_symndx)
9389 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
9390 asection *target_sec = NULL;
9391 if (r_symndx < symtab_hdr->sh_info)
9393 Elf_Internal_Sym *isymbuf;
9394 unsigned int section_index;
9396 isymbuf = retrieve_local_syms (abfd);
9397 section_index = isymbuf[r_symndx].st_shndx;
9399 if (section_index == SHN_UNDEF)
9400 target_sec = bfd_und_section_ptr;
9401 else if (section_index > 0 && section_index < SHN_LORESERVE)
9402 target_sec = bfd_section_from_elf_index (abfd, section_index);
9403 else if (section_index == SHN_ABS)
9404 target_sec = bfd_abs_section_ptr;
9405 else if (section_index == SHN_COMMON)
9406 target_sec = bfd_com_section_ptr;
9413 unsigned long indx = r_symndx - symtab_hdr->sh_info;
9414 struct elf_link_hash_entry *h = elf_sym_hashes (abfd)[indx];
9416 while (h->root.type == bfd_link_hash_indirect
9417 || h->root.type == bfd_link_hash_warning)
9418 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9420 switch (h->root.type)
9422 case bfd_link_hash_defined:
9423 case bfd_link_hash_defweak:
9424 target_sec = h->root.u.def.section;
9426 case bfd_link_hash_common:
9427 target_sec = bfd_com_section_ptr;
9429 case bfd_link_hash_undefined:
9430 case bfd_link_hash_undefweak:
9431 target_sec = bfd_und_section_ptr;
9433 default: /* New indirect warning. */
9434 target_sec = bfd_und_section_ptr;
9442 static struct elf_link_hash_entry *
9443 get_elf_r_symndx_hash_entry (bfd *abfd, unsigned long r_symndx)
9446 struct elf_link_hash_entry *h;
9447 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
9449 if (r_symndx < symtab_hdr->sh_info)
9452 indx = r_symndx - symtab_hdr->sh_info;
9453 h = elf_sym_hashes (abfd)[indx];
9454 while (h->root.type == bfd_link_hash_indirect
9455 || h->root.type == bfd_link_hash_warning)
9456 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9461 /* Get the section-relative offset for a symbol number. */
9464 get_elf_r_symndx_offset (bfd *abfd, unsigned long r_symndx)
9466 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
9469 if (r_symndx < symtab_hdr->sh_info)
9471 Elf_Internal_Sym *isymbuf;
9472 isymbuf = retrieve_local_syms (abfd);
9473 offset = isymbuf[r_symndx].st_value;
9477 unsigned long indx = r_symndx - symtab_hdr->sh_info;
9478 struct elf_link_hash_entry *h =
9479 elf_sym_hashes (abfd)[indx];
9481 while (h->root.type == bfd_link_hash_indirect
9482 || h->root.type == bfd_link_hash_warning)
9483 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9484 if (h->root.type == bfd_link_hash_defined
9485 || h->root.type == bfd_link_hash_defweak)
9486 offset = h->root.u.def.value;
9493 is_reloc_sym_weak (bfd *abfd, Elf_Internal_Rela *rel)
9495 unsigned long r_symndx = ELF32_R_SYM (rel->r_info);
9496 struct elf_link_hash_entry *h;
9498 h = get_elf_r_symndx_hash_entry (abfd, r_symndx);
9499 if (h && h->root.type == bfd_link_hash_defweak)
9506 pcrel_reloc_fits (xtensa_opcode opc,
9508 bfd_vma self_address,
9509 bfd_vma dest_address)
9511 xtensa_isa isa = xtensa_default_isa;
9512 uint32 valp = dest_address;
9513 if (xtensa_operand_do_reloc (isa, opc, opnd, &valp, self_address)
9514 || xtensa_operand_encode (isa, opc, opnd, &valp))
9520 static int linkonce_len = sizeof (".gnu.linkonce.") - 1;
9521 static int insn_sec_len = sizeof (XTENSA_INSN_SEC_NAME) - 1;
9522 static int lit_sec_len = sizeof (XTENSA_LIT_SEC_NAME) - 1;
9523 static int prop_sec_len = sizeof (XTENSA_PROP_SEC_NAME) - 1;
9527 xtensa_is_property_section (asection *sec)
9529 if (strncmp (XTENSA_INSN_SEC_NAME, sec->name, insn_sec_len) == 0
9530 || strncmp (XTENSA_LIT_SEC_NAME, sec->name, lit_sec_len) == 0
9531 || strncmp (XTENSA_PROP_SEC_NAME, sec->name, prop_sec_len) == 0)
9534 if (strncmp (".gnu.linkonce.", sec->name, linkonce_len) == 0
9535 && (strncmp (&sec->name[linkonce_len], "x.", 2) == 0
9536 || strncmp (&sec->name[linkonce_len], "p.", 2) == 0
9537 || strncmp (&sec->name[linkonce_len], "prop.", 5) == 0))
9545 xtensa_is_littable_section (asection *sec)
9547 if (strncmp (XTENSA_LIT_SEC_NAME, sec->name, lit_sec_len) == 0)
9550 if (strncmp (".gnu.linkonce.", sec->name, linkonce_len) == 0
9551 && sec->name[linkonce_len] == 'p'
9552 && sec->name[linkonce_len + 1] == '.')
9560 internal_reloc_compare (const void *ap, const void *bp)
9562 const Elf_Internal_Rela *a = (const Elf_Internal_Rela *) ap;
9563 const Elf_Internal_Rela *b = (const Elf_Internal_Rela *) bp;
9565 if (a->r_offset != b->r_offset)
9566 return (a->r_offset - b->r_offset);
9568 /* We don't need to sort on these criteria for correctness,
9569 but enforcing a more strict ordering prevents unstable qsort
9570 from behaving differently with different implementations.
9571 Without the code below we get correct but different results
9572 on Solaris 2.7 and 2.8. We would like to always produce the
9573 same results no matter the host. */
9575 if (a->r_info != b->r_info)
9576 return (a->r_info - b->r_info);
9578 return (a->r_addend - b->r_addend);
9583 internal_reloc_matches (const void *ap, const void *bp)
9585 const Elf_Internal_Rela *a = (const Elf_Internal_Rela *) ap;
9586 const Elf_Internal_Rela *b = (const Elf_Internal_Rela *) bp;
9588 /* Check if one entry overlaps with the other; this shouldn't happen
9589 except when searching for a match. */
9590 return (a->r_offset - b->r_offset);
9594 /* Predicate function used to look up a section in a particular group. */
9597 match_section_group (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, void *inf)
9599 const char *gname = inf;
9600 const char *group_name = elf_group_name (sec);
9602 return (group_name == gname
9603 || (group_name != NULL
9605 && strcmp (group_name, gname) == 0));
9610 xtensa_get_property_section (asection *sec, const char *base_name)
9612 const char *suffix, *group_name;
9613 char *prop_sec_name;
9616 group_name = elf_group_name (sec);
9619 suffix = strrchr (sec->name, '.');
9620 if (suffix == sec->name)
9622 prop_sec_name = (char *) bfd_malloc (strlen (base_name) + 1
9623 + (suffix ? strlen (suffix) : 0));
9624 strcpy (prop_sec_name, base_name);
9626 strcat (prop_sec_name, suffix);
9628 else if (strncmp (sec->name, ".gnu.linkonce.", linkonce_len) == 0)
9630 char *linkonce_kind = 0;
9632 if (strcmp (base_name, XTENSA_INSN_SEC_NAME) == 0)
9633 linkonce_kind = "x.";
9634 else if (strcmp (base_name, XTENSA_LIT_SEC_NAME) == 0)
9635 linkonce_kind = "p.";
9636 else if (strcmp (base_name, XTENSA_PROP_SEC_NAME) == 0)
9637 linkonce_kind = "prop.";
9641 prop_sec_name = (char *) bfd_malloc (strlen (sec->name)
9642 + strlen (linkonce_kind) + 1);
9643 memcpy (prop_sec_name, ".gnu.linkonce.", linkonce_len);
9644 strcpy (prop_sec_name + linkonce_len, linkonce_kind);
9646 suffix = sec->name + linkonce_len;
9647 /* For backward compatibility, replace "t." instead of inserting
9648 the new linkonce_kind (but not for "prop" sections). */
9649 if (strncmp (suffix, "t.", 2) == 0 && linkonce_kind[1] == '.')
9651 strcat (prop_sec_name + linkonce_len, suffix);
9654 prop_sec_name = strdup (base_name);
9656 /* Check if the section already exists. */
9657 prop_sec = bfd_get_section_by_name_if (sec->owner, prop_sec_name,
9658 match_section_group,
9659 (void *) group_name);
9660 /* If not, create it. */
9663 flagword flags = (SEC_RELOC | SEC_HAS_CONTENTS | SEC_READONLY);
9664 flags |= (bfd_get_section_flags (sec->owner, sec)
9665 & (SEC_LINK_ONCE | SEC_LINK_DUPLICATES));
9667 prop_sec = bfd_make_section_anyway_with_flags
9668 (sec->owner, strdup (prop_sec_name), flags);
9672 elf_group_name (prop_sec) = group_name;
9675 free (prop_sec_name);
9681 xtensa_get_property_predef_flags (asection *sec)
9683 if (strncmp (sec->name, XTENSA_INSN_SEC_NAME,
9684 sizeof (XTENSA_INSN_SEC_NAME) - 1) == 0
9685 || strncmp (sec->name, ".gnu.linkonce.x.",
9686 sizeof ".gnu.linkonce.x." - 1) == 0)
9687 return (XTENSA_PROP_INSN
9688 | XTENSA_PROP_INSN_NO_TRANSFORM
9689 | XTENSA_PROP_INSN_NO_REORDER);
9691 if (xtensa_is_littable_section (sec))
9692 return (XTENSA_PROP_LITERAL
9693 | XTENSA_PROP_INSN_NO_TRANSFORM
9694 | XTENSA_PROP_INSN_NO_REORDER);
9700 /* Other functions called directly by the linker. */
9703 xtensa_callback_required_dependence (bfd *abfd,
9705 struct bfd_link_info *link_info,
9706 deps_callback_t callback,
9709 Elf_Internal_Rela *internal_relocs;
9712 bfd_boolean ok = TRUE;
9713 bfd_size_type sec_size;
9715 sec_size = bfd_get_section_limit (abfd, sec);
9717 /* ".plt*" sections have no explicit relocations but they contain L32R
9718 instructions that reference the corresponding ".got.plt*" sections. */
9719 if ((sec->flags & SEC_LINKER_CREATED) != 0
9720 && strncmp (sec->name, ".plt", 4) == 0)
9724 /* Find the corresponding ".got.plt*" section. */
9725 if (sec->name[4] == '\0')
9726 sgotplt = bfd_get_section_by_name (sec->owner, ".got.plt");
9732 BFD_ASSERT (sec->name[4] == '.');
9733 chunk = strtol (&sec->name[5], NULL, 10);
9735 sprintf (got_name, ".got.plt.%u", chunk);
9736 sgotplt = bfd_get_section_by_name (sec->owner, got_name);
9738 BFD_ASSERT (sgotplt);
9740 /* Assume worst-case offsets: L32R at the very end of the ".plt"
9741 section referencing a literal at the very beginning of
9742 ".got.plt". This is very close to the real dependence, anyway. */
9743 (*callback) (sec, sec_size, sgotplt, 0, closure);
9746 internal_relocs = retrieve_internal_relocs (abfd, sec,
9747 link_info->keep_memory);
9748 if (internal_relocs == NULL
9749 || sec->reloc_count == 0)
9752 /* Cache the contents for the duration of this scan. */
9753 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
9754 if (contents == NULL && sec_size != 0)
9760 if (!xtensa_default_isa)
9761 xtensa_default_isa = xtensa_isa_init (0, 0);
9763 for (i = 0; i < sec->reloc_count; i++)
9765 Elf_Internal_Rela *irel = &internal_relocs[i];
9766 if (is_l32r_relocation (abfd, sec, contents, irel))
9769 asection *target_sec;
9770 bfd_vma target_offset;
9772 r_reloc_init (&l32r_rel, abfd, irel, contents, sec_size);
9775 /* L32Rs must be local to the input file. */
9776 if (r_reloc_is_defined (&l32r_rel))
9778 target_sec = r_reloc_get_section (&l32r_rel);
9779 target_offset = l32r_rel.target_offset;
9781 (*callback) (sec, irel->r_offset, target_sec, target_offset,
9787 release_internal_relocs (sec, internal_relocs);
9788 release_contents (sec, contents);
9792 /* The default literal sections should always be marked as "code" (i.e.,
9793 SHF_EXECINSTR). This is particularly important for the Linux kernel
9794 module loader so that the literals are not placed after the text. */
9795 static const struct bfd_elf_special_section elf_xtensa_special_sections[] =
9797 { ".fini.literal", 13, 0, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR },
9798 { ".init.literal", 13, 0, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR },
9799 { ".literal", 8, 0, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR },
9800 { NULL, 0, 0, 0, 0 }
9804 #define TARGET_LITTLE_SYM bfd_elf32_xtensa_le_vec
9805 #define TARGET_LITTLE_NAME "elf32-xtensa-le"
9806 #define TARGET_BIG_SYM bfd_elf32_xtensa_be_vec
9807 #define TARGET_BIG_NAME "elf32-xtensa-be"
9808 #define ELF_ARCH bfd_arch_xtensa
9810 #define ELF_MACHINE_CODE EM_XTENSA
9811 #define ELF_MACHINE_ALT1 EM_XTENSA_OLD
9814 #define ELF_MAXPAGESIZE (1 << XCHAL_MMU_MIN_PTE_PAGE_SIZE)
9815 #else /* !XCHAL_HAVE_MMU */
9816 #define ELF_MAXPAGESIZE 1
9817 #endif /* !XCHAL_HAVE_MMU */
9818 #endif /* ELF_ARCH */
9820 #define elf_backend_can_gc_sections 1
9821 #define elf_backend_can_refcount 1
9822 #define elf_backend_plt_readonly 1
9823 #define elf_backend_got_header_size 4
9824 #define elf_backend_want_dynbss 0
9825 #define elf_backend_want_got_plt 1
9827 #define elf_info_to_howto elf_xtensa_info_to_howto_rela
9829 #define bfd_elf32_bfd_merge_private_bfd_data elf_xtensa_merge_private_bfd_data
9830 #define bfd_elf32_new_section_hook elf_xtensa_new_section_hook
9831 #define bfd_elf32_bfd_print_private_bfd_data elf_xtensa_print_private_bfd_data
9832 #define bfd_elf32_bfd_relax_section elf_xtensa_relax_section
9833 #define bfd_elf32_bfd_reloc_type_lookup elf_xtensa_reloc_type_lookup
9834 #define bfd_elf32_bfd_set_private_flags elf_xtensa_set_private_flags
9836 #define elf_backend_adjust_dynamic_symbol elf_xtensa_adjust_dynamic_symbol
9837 #define elf_backend_check_relocs elf_xtensa_check_relocs
9838 #define elf_backend_create_dynamic_sections elf_xtensa_create_dynamic_sections
9839 #define elf_backend_discard_info elf_xtensa_discard_info
9840 #define elf_backend_ignore_discarded_relocs elf_xtensa_ignore_discarded_relocs
9841 #define elf_backend_final_write_processing elf_xtensa_final_write_processing
9842 #define elf_backend_finish_dynamic_sections elf_xtensa_finish_dynamic_sections
9843 #define elf_backend_finish_dynamic_symbol elf_xtensa_finish_dynamic_symbol
9844 #define elf_backend_gc_mark_hook elf_xtensa_gc_mark_hook
9845 #define elf_backend_gc_sweep_hook elf_xtensa_gc_sweep_hook
9846 #define elf_backend_grok_prstatus elf_xtensa_grok_prstatus
9847 #define elf_backend_grok_psinfo elf_xtensa_grok_psinfo
9848 #define elf_backend_hide_symbol elf_xtensa_hide_symbol
9849 #define elf_backend_object_p elf_xtensa_object_p
9850 #define elf_backend_reloc_type_class elf_xtensa_reloc_type_class
9851 #define elf_backend_relocate_section elf_xtensa_relocate_section
9852 #define elf_backend_size_dynamic_sections elf_xtensa_size_dynamic_sections
9853 #define elf_backend_special_sections elf_xtensa_special_sections
9855 #include "elf32-target.h"