1 /* Xtensa-specific support for 32-bit ELF.
2 Copyright 2003, 2004 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., 59 Temple Place - Suite 330, Boston, MA
24 #ifdef ANSI_PROTOTYPES
34 #include "elf/xtensa.h"
35 #include "xtensa-isa.h"
36 #include "xtensa-config.h"
38 #define XTENSA_NO_NOP_REMOVAL 0
40 extern flagword elf_xtensa_get_private_bfd_flags (bfd *);
42 /* Local helper functions. */
44 static bfd_boolean add_extra_plt_sections (bfd *, int);
45 static char *build_encoding_error_message (xtensa_opcode, bfd_vma);
46 static bfd_reloc_status_type bfd_elf_xtensa_reloc
47 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
48 static bfd_boolean do_fix_for_relocatable_link
49 (Elf_Internal_Rela *, bfd *, asection *, bfd_byte *);
50 static void do_fix_for_final_link
51 (Elf_Internal_Rela *, bfd *, asection *, bfd_byte *, bfd_vma *);
53 /* Local functions to handle Xtensa configurability. */
55 static bfd_boolean is_indirect_call_opcode (xtensa_opcode);
56 static bfd_boolean is_direct_call_opcode (xtensa_opcode);
57 static bfd_boolean is_windowed_call_opcode (xtensa_opcode);
58 static xtensa_opcode get_const16_opcode (void);
59 static xtensa_opcode get_l32r_opcode (void);
60 static bfd_vma l32r_offset (bfd_vma, bfd_vma);
61 static int get_relocation_opnd (xtensa_opcode, int);
62 static int get_relocation_slot (int);
63 static xtensa_opcode get_relocation_opcode
64 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *);
65 static bfd_boolean is_l32r_relocation
66 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *);
67 static bfd_boolean is_alt_relocation (int);
68 static bfd_boolean is_operand_relocation (int);
69 static bfd_size_type insn_decode_len
70 (bfd_byte *, bfd_size_type, bfd_size_type);
71 static xtensa_opcode insn_decode_opcode
72 (bfd_byte *, bfd_size_type, bfd_size_type, int);
73 static bfd_boolean check_branch_target_aligned
74 (bfd_byte *, bfd_size_type, bfd_vma, bfd_vma);
75 static bfd_boolean check_loop_aligned
76 (bfd_byte *, bfd_size_type, bfd_vma, bfd_vma);
77 static bfd_boolean check_branch_target_aligned_address (bfd_vma, int);
78 static bfd_size_type get_asm_simplify_size
79 (bfd_byte *, bfd_size_type, bfd_size_type);
81 /* Functions for link-time code simplifications. */
83 static bfd_reloc_status_type elf_xtensa_do_asm_simplify
84 (bfd_byte *, bfd_vma, bfd_vma, char **);
85 static bfd_reloc_status_type contract_asm_expansion
86 (bfd_byte *, bfd_vma, Elf_Internal_Rela *, char **);
87 static xtensa_opcode swap_callx_for_call_opcode (xtensa_opcode);
88 static xtensa_opcode get_expanded_call_opcode (bfd_byte *, int, bfd_boolean *);
90 /* Access to internal relocations, section contents and symbols. */
92 static Elf_Internal_Rela *retrieve_internal_relocs
93 (bfd *, asection *, bfd_boolean);
94 static void pin_internal_relocs (asection *, Elf_Internal_Rela *);
95 static void release_internal_relocs (asection *, Elf_Internal_Rela *);
96 static bfd_byte *retrieve_contents (bfd *, asection *, bfd_boolean);
97 static void pin_contents (asection *, bfd_byte *);
98 static void release_contents (asection *, bfd_byte *);
99 static Elf_Internal_Sym *retrieve_local_syms (bfd *);
101 /* Miscellaneous utility functions. */
103 static asection *elf_xtensa_get_plt_section (bfd *, int);
104 static asection *elf_xtensa_get_gotplt_section (bfd *, int);
105 static asection *get_elf_r_symndx_section (bfd *, unsigned long);
106 static struct elf_link_hash_entry *get_elf_r_symndx_hash_entry
107 (bfd *, unsigned long);
108 static bfd_vma get_elf_r_symndx_offset (bfd *, unsigned long);
109 static bfd_boolean is_reloc_sym_weak (bfd *, Elf_Internal_Rela *);
110 static bfd_boolean pcrel_reloc_fits (xtensa_opcode, int, bfd_vma, bfd_vma);
111 static bfd_boolean xtensa_is_property_section (asection *);
112 static bfd_boolean xtensa_is_littable_section (asection *);
113 static int internal_reloc_compare (const void *, const void *);
114 static int internal_reloc_matches (const void *, const void *);
115 extern char *xtensa_get_property_section_name (asection *, const char *);
116 static flagword xtensa_get_property_predef_flags (asection *);
118 /* Other functions called directly by the linker. */
120 typedef void (*deps_callback_t)
121 (asection *, bfd_vma, asection *, bfd_vma, void *);
122 extern bfd_boolean xtensa_callback_required_dependence
123 (bfd *, asection *, struct bfd_link_info *, deps_callback_t, void *);
126 /* Globally visible flag for choosing size optimization of NOP removal
127 instead of branch-target-aware minimization for NOP removal.
128 When nonzero, narrow all instructions and remove all NOPs possible
129 around longcall expansions. */
131 int elf32xtensa_size_opt;
134 /* The "new_section_hook" is used to set up a per-section
135 "xtensa_relax_info" data structure with additional information used
136 during relaxation. */
138 typedef struct xtensa_relax_info_struct xtensa_relax_info;
141 /* Total count of PLT relocations seen during check_relocs.
142 The actual PLT code must be split into multiple sections and all
143 the sections have to be created before size_dynamic_sections,
144 where we figure out the exact number of PLT entries that will be
145 needed. It is OK if this count is an overestimate, e.g., some
146 relocations may be removed by GC. */
148 static int plt_reloc_count = 0;
151 /* The GNU tools do not easily allow extending interfaces to pass around
152 the pointer to the Xtensa ISA information, so instead we add a global
153 variable here (in BFD) that can be used by any of the tools that need
156 xtensa_isa xtensa_default_isa;
159 /* When this is true, relocations may have been modified to refer to
160 symbols from other input files. The per-section list of "fix"
161 records needs to be checked when resolving relocations. */
163 static bfd_boolean relaxing_section = FALSE;
165 /* When this is true, during final links, literals that cannot be
166 coalesced and their relocations may be moved to other sections. */
168 int elf32xtensa_no_literal_movement = 1;
171 static reloc_howto_type elf_howto_table[] =
173 HOWTO (R_XTENSA_NONE, 0, 0, 0, FALSE, 0, complain_overflow_dont,
174 bfd_elf_xtensa_reloc, "R_XTENSA_NONE",
175 FALSE, 0x00000000, 0x00000000, FALSE),
176 HOWTO (R_XTENSA_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
177 bfd_elf_xtensa_reloc, "R_XTENSA_32",
178 TRUE, 0xffffffff, 0xffffffff, FALSE),
179 /* Replace a 32-bit value with a value from the runtime linker (only
180 used by linker-generated stub functions). The r_addend value is
181 special: 1 means to substitute a pointer to the runtime linker's
182 dynamic resolver function; 2 means to substitute the link map for
183 the shared object. */
184 HOWTO (R_XTENSA_RTLD, 0, 2, 32, FALSE, 0, complain_overflow_dont,
185 NULL, "R_XTENSA_RTLD",
186 FALSE, 0x00000000, 0x00000000, FALSE),
187 HOWTO (R_XTENSA_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
188 bfd_elf_generic_reloc, "R_XTENSA_GLOB_DAT",
189 FALSE, 0xffffffff, 0xffffffff, FALSE),
190 HOWTO (R_XTENSA_JMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
191 bfd_elf_generic_reloc, "R_XTENSA_JMP_SLOT",
192 FALSE, 0xffffffff, 0xffffffff, FALSE),
193 HOWTO (R_XTENSA_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
194 bfd_elf_generic_reloc, "R_XTENSA_RELATIVE",
195 FALSE, 0xffffffff, 0xffffffff, FALSE),
196 HOWTO (R_XTENSA_PLT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
197 bfd_elf_xtensa_reloc, "R_XTENSA_PLT",
198 FALSE, 0xffffffff, 0xffffffff, FALSE),
200 HOWTO (R_XTENSA_OP0, 0, 0, 0, TRUE, 0, complain_overflow_dont,
201 bfd_elf_xtensa_reloc, "R_XTENSA_OP0",
202 FALSE, 0x00000000, 0x00000000, TRUE),
203 HOWTO (R_XTENSA_OP1, 0, 0, 0, TRUE, 0, complain_overflow_dont,
204 bfd_elf_xtensa_reloc, "R_XTENSA_OP1",
205 FALSE, 0x00000000, 0x00000000, TRUE),
206 HOWTO (R_XTENSA_OP2, 0, 0, 0, TRUE, 0, complain_overflow_dont,
207 bfd_elf_xtensa_reloc, "R_XTENSA_OP2",
208 FALSE, 0x00000000, 0x00000000, TRUE),
209 /* Assembly auto-expansion. */
210 HOWTO (R_XTENSA_ASM_EXPAND, 0, 0, 0, TRUE, 0, complain_overflow_dont,
211 bfd_elf_xtensa_reloc, "R_XTENSA_ASM_EXPAND",
212 FALSE, 0x00000000, 0x00000000, FALSE),
213 /* Relax assembly auto-expansion. */
214 HOWTO (R_XTENSA_ASM_SIMPLIFY, 0, 0, 0, TRUE, 0, complain_overflow_dont,
215 bfd_elf_xtensa_reloc, "R_XTENSA_ASM_SIMPLIFY",
216 FALSE, 0x00000000, 0x00000000, TRUE),
219 /* GNU extension to record C++ vtable hierarchy. */
220 HOWTO (R_XTENSA_GNU_VTINHERIT, 0, 2, 0, FALSE, 0, complain_overflow_dont,
221 NULL, "R_XTENSA_GNU_VTINHERIT",
222 FALSE, 0x00000000, 0x00000000, FALSE),
223 /* GNU extension to record C++ vtable member usage. */
224 HOWTO (R_XTENSA_GNU_VTENTRY, 0, 2, 0, FALSE, 0, complain_overflow_dont,
225 _bfd_elf_rel_vtable_reloc_fn, "R_XTENSA_GNU_VTENTRY",
226 FALSE, 0x00000000, 0x00000000, FALSE),
228 /* Relocations for supporting difference of symbols. */
229 HOWTO (R_XTENSA_DIFF8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
230 bfd_elf_xtensa_reloc, "R_XTENSA_DIFF8",
231 FALSE, 0xffffffff, 0xffffffff, FALSE),
232 HOWTO (R_XTENSA_DIFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
233 bfd_elf_xtensa_reloc, "R_XTENSA_DIFF16",
234 FALSE, 0xffffffff, 0xffffffff, FALSE),
235 HOWTO (R_XTENSA_DIFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
236 bfd_elf_xtensa_reloc, "R_XTENSA_DIFF32",
237 FALSE, 0xffffffff, 0xffffffff, FALSE),
239 /* General immediate operand relocations. */
240 HOWTO (R_XTENSA_SLOT0_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
241 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT0_OP",
242 FALSE, 0x00000000, 0x00000000, TRUE),
243 HOWTO (R_XTENSA_SLOT1_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
244 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT1_OP",
245 FALSE, 0x00000000, 0x00000000, TRUE),
246 HOWTO (R_XTENSA_SLOT2_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
247 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT2_OP",
248 FALSE, 0x00000000, 0x00000000, TRUE),
249 HOWTO (R_XTENSA_SLOT3_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
250 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT3_OP",
251 FALSE, 0x00000000, 0x00000000, TRUE),
252 HOWTO (R_XTENSA_SLOT4_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
253 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT4_OP",
254 FALSE, 0x00000000, 0x00000000, TRUE),
255 HOWTO (R_XTENSA_SLOT5_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
256 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT5_OP",
257 FALSE, 0x00000000, 0x00000000, TRUE),
258 HOWTO (R_XTENSA_SLOT6_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
259 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT6_OP",
260 FALSE, 0x00000000, 0x00000000, TRUE),
261 HOWTO (R_XTENSA_SLOT7_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
262 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT7_OP",
263 FALSE, 0x00000000, 0x00000000, TRUE),
264 HOWTO (R_XTENSA_SLOT8_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
265 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT8_OP",
266 FALSE, 0x00000000, 0x00000000, TRUE),
267 HOWTO (R_XTENSA_SLOT9_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
268 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT9_OP",
269 FALSE, 0x00000000, 0x00000000, TRUE),
270 HOWTO (R_XTENSA_SLOT10_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
271 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT10_OP",
272 FALSE, 0x00000000, 0x00000000, TRUE),
273 HOWTO (R_XTENSA_SLOT11_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
274 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT11_OP",
275 FALSE, 0x00000000, 0x00000000, TRUE),
276 HOWTO (R_XTENSA_SLOT12_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
277 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT12_OP",
278 FALSE, 0x00000000, 0x00000000, TRUE),
279 HOWTO (R_XTENSA_SLOT13_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
280 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT13_OP",
281 FALSE, 0x00000000, 0x00000000, TRUE),
282 HOWTO (R_XTENSA_SLOT14_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
283 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT14_OP",
284 FALSE, 0x00000000, 0x00000000, TRUE),
286 /* "Alternate" relocations. The meaning of these is opcode-specific. */
287 HOWTO (R_XTENSA_SLOT0_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
288 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT0_ALT",
289 FALSE, 0x00000000, 0x00000000, TRUE),
290 HOWTO (R_XTENSA_SLOT1_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
291 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT1_ALT",
292 FALSE, 0x00000000, 0x00000000, TRUE),
293 HOWTO (R_XTENSA_SLOT2_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
294 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT2_ALT",
295 FALSE, 0x00000000, 0x00000000, TRUE),
296 HOWTO (R_XTENSA_SLOT3_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
297 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT3_ALT",
298 FALSE, 0x00000000, 0x00000000, TRUE),
299 HOWTO (R_XTENSA_SLOT4_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
300 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT4_ALT",
301 FALSE, 0x00000000, 0x00000000, TRUE),
302 HOWTO (R_XTENSA_SLOT5_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
303 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT5_ALT",
304 FALSE, 0x00000000, 0x00000000, TRUE),
305 HOWTO (R_XTENSA_SLOT6_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
306 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT6_ALT",
307 FALSE, 0x00000000, 0x00000000, TRUE),
308 HOWTO (R_XTENSA_SLOT7_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
309 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT7_ALT",
310 FALSE, 0x00000000, 0x00000000, TRUE),
311 HOWTO (R_XTENSA_SLOT8_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
312 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT8_ALT",
313 FALSE, 0x00000000, 0x00000000, TRUE),
314 HOWTO (R_XTENSA_SLOT9_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
315 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT9_ALT",
316 FALSE, 0x00000000, 0x00000000, TRUE),
317 HOWTO (R_XTENSA_SLOT10_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
318 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT10_ALT",
319 FALSE, 0x00000000, 0x00000000, TRUE),
320 HOWTO (R_XTENSA_SLOT11_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
321 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT11_ALT",
322 FALSE, 0x00000000, 0x00000000, TRUE),
323 HOWTO (R_XTENSA_SLOT12_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
324 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT12_ALT",
325 FALSE, 0x00000000, 0x00000000, TRUE),
326 HOWTO (R_XTENSA_SLOT13_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
327 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT13_ALT",
328 FALSE, 0x00000000, 0x00000000, TRUE),
329 HOWTO (R_XTENSA_SLOT14_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
330 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT14_ALT",
331 FALSE, 0x00000000, 0x00000000, TRUE)
336 fprintf (stderr, "Xtensa bfd reloc lookup %d (%s)\n", code, str)
341 static reloc_howto_type *
342 elf_xtensa_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
343 bfd_reloc_code_real_type code)
348 TRACE ("BFD_RELOC_NONE");
349 return &elf_howto_table[(unsigned) R_XTENSA_NONE ];
352 TRACE ("BFD_RELOC_32");
353 return &elf_howto_table[(unsigned) R_XTENSA_32 ];
355 case BFD_RELOC_XTENSA_DIFF8:
356 TRACE ("BFD_RELOC_XTENSA_DIFF8");
357 return &elf_howto_table[(unsigned) R_XTENSA_DIFF8 ];
359 case BFD_RELOC_XTENSA_DIFF16:
360 TRACE ("BFD_RELOC_XTENSA_DIFF16");
361 return &elf_howto_table[(unsigned) R_XTENSA_DIFF16 ];
363 case BFD_RELOC_XTENSA_DIFF32:
364 TRACE ("BFD_RELOC_XTENSA_DIFF32");
365 return &elf_howto_table[(unsigned) R_XTENSA_DIFF32 ];
367 case BFD_RELOC_XTENSA_RTLD:
368 TRACE ("BFD_RELOC_XTENSA_RTLD");
369 return &elf_howto_table[(unsigned) R_XTENSA_RTLD ];
371 case BFD_RELOC_XTENSA_GLOB_DAT:
372 TRACE ("BFD_RELOC_XTENSA_GLOB_DAT");
373 return &elf_howto_table[(unsigned) R_XTENSA_GLOB_DAT ];
375 case BFD_RELOC_XTENSA_JMP_SLOT:
376 TRACE ("BFD_RELOC_XTENSA_JMP_SLOT");
377 return &elf_howto_table[(unsigned) R_XTENSA_JMP_SLOT ];
379 case BFD_RELOC_XTENSA_RELATIVE:
380 TRACE ("BFD_RELOC_XTENSA_RELATIVE");
381 return &elf_howto_table[(unsigned) R_XTENSA_RELATIVE ];
383 case BFD_RELOC_XTENSA_PLT:
384 TRACE ("BFD_RELOC_XTENSA_PLT");
385 return &elf_howto_table[(unsigned) R_XTENSA_PLT ];
387 case BFD_RELOC_XTENSA_OP0:
388 TRACE ("BFD_RELOC_XTENSA_OP0");
389 return &elf_howto_table[(unsigned) R_XTENSA_OP0 ];
391 case BFD_RELOC_XTENSA_OP1:
392 TRACE ("BFD_RELOC_XTENSA_OP1");
393 return &elf_howto_table[(unsigned) R_XTENSA_OP1 ];
395 case BFD_RELOC_XTENSA_OP2:
396 TRACE ("BFD_RELOC_XTENSA_OP2");
397 return &elf_howto_table[(unsigned) R_XTENSA_OP2 ];
399 case BFD_RELOC_XTENSA_ASM_EXPAND:
400 TRACE ("BFD_RELOC_XTENSA_ASM_EXPAND");
401 return &elf_howto_table[(unsigned) R_XTENSA_ASM_EXPAND ];
403 case BFD_RELOC_XTENSA_ASM_SIMPLIFY:
404 TRACE ("BFD_RELOC_XTENSA_ASM_SIMPLIFY");
405 return &elf_howto_table[(unsigned) R_XTENSA_ASM_SIMPLIFY ];
407 case BFD_RELOC_VTABLE_INHERIT:
408 TRACE ("BFD_RELOC_VTABLE_INHERIT");
409 return &elf_howto_table[(unsigned) R_XTENSA_GNU_VTINHERIT ];
411 case BFD_RELOC_VTABLE_ENTRY:
412 TRACE ("BFD_RELOC_VTABLE_ENTRY");
413 return &elf_howto_table[(unsigned) R_XTENSA_GNU_VTENTRY ];
416 if (code >= BFD_RELOC_XTENSA_SLOT0_OP
417 && code <= BFD_RELOC_XTENSA_SLOT14_OP)
419 unsigned n = (R_XTENSA_SLOT0_OP +
420 (code - BFD_RELOC_XTENSA_SLOT0_OP));
421 return &elf_howto_table[n];
424 if (code >= BFD_RELOC_XTENSA_SLOT0_ALT
425 && code <= BFD_RELOC_XTENSA_SLOT14_ALT)
427 unsigned n = (R_XTENSA_SLOT0_ALT +
428 (code - BFD_RELOC_XTENSA_SLOT0_ALT));
429 return &elf_howto_table[n];
440 /* Given an ELF "rela" relocation, find the corresponding howto and record
441 it in the BFD internal arelent representation of the relocation. */
444 elf_xtensa_info_to_howto_rela (bfd *abfd ATTRIBUTE_UNUSED,
446 Elf_Internal_Rela *dst)
448 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
450 BFD_ASSERT (r_type < (unsigned int) R_XTENSA_max);
451 cache_ptr->howto = &elf_howto_table[r_type];
455 /* Functions for the Xtensa ELF linker. */
457 /* The name of the dynamic interpreter. This is put in the .interp
460 #define ELF_DYNAMIC_INTERPRETER "/lib/ld.so"
462 /* The size in bytes of an entry in the procedure linkage table.
463 (This does _not_ include the space for the literals associated with
466 #define PLT_ENTRY_SIZE 16
468 /* For _really_ large PLTs, we may need to alternate between literals
469 and code to keep the literals within the 256K range of the L32R
470 instructions in the code. It's unlikely that anyone would ever need
471 such a big PLT, but an arbitrary limit on the PLT size would be bad.
472 Thus, we split the PLT into chunks. Since there's very little
473 overhead (2 extra literals) for each chunk, the chunk size is kept
474 small so that the code for handling multiple chunks get used and
475 tested regularly. With 254 entries, there are 1K of literals for
476 each chunk, and that seems like a nice round number. */
478 #define PLT_ENTRIES_PER_CHUNK 254
480 /* PLT entries are actually used as stub functions for lazy symbol
481 resolution. Once the symbol is resolved, the stub function is never
482 invoked. Note: the 32-byte frame size used here cannot be changed
483 without a corresponding change in the runtime linker. */
485 static const bfd_byte elf_xtensa_be_plt_entry[PLT_ENTRY_SIZE] =
487 0x6c, 0x10, 0x04, /* entry sp, 32 */
488 0x18, 0x00, 0x00, /* l32r a8, [got entry for rtld's resolver] */
489 0x1a, 0x00, 0x00, /* l32r a10, [got entry for rtld's link map] */
490 0x1b, 0x00, 0x00, /* l32r a11, [literal for reloc index] */
491 0x0a, 0x80, 0x00, /* jx a8 */
495 static const bfd_byte elf_xtensa_le_plt_entry[PLT_ENTRY_SIZE] =
497 0x36, 0x41, 0x00, /* entry sp, 32 */
498 0x81, 0x00, 0x00, /* l32r a8, [got entry for rtld's resolver] */
499 0xa1, 0x00, 0x00, /* l32r a10, [got entry for rtld's link map] */
500 0xb1, 0x00, 0x00, /* l32r a11, [literal for reloc index] */
501 0xa0, 0x08, 0x00, /* jx a8 */
506 static inline bfd_boolean
507 xtensa_elf_dynamic_symbol_p (struct elf_link_hash_entry *h,
508 struct bfd_link_info *info)
510 /* Check if we should do dynamic things to this symbol. The
511 "ignore_protected" argument need not be set, because Xtensa code
512 does not require special handling of STV_PROTECTED to make function
513 pointer comparisons work properly. The PLT addresses are never
514 used for function pointers. */
516 return _bfd_elf_dynamic_symbol_p (h, info, 0);
521 property_table_compare (const void *ap, const void *bp)
523 const property_table_entry *a = (const property_table_entry *) ap;
524 const property_table_entry *b = (const property_table_entry *) bp;
526 if (a->address == b->address)
528 /* The only circumstance where two entries may legitimately have the
529 same address is when one of them is a zero-size placeholder to
530 mark a place where fill can be inserted. The zero-size entry should
532 BFD_ASSERT ((a->size == 0 || b->size == 0));
534 if (a->size != b->size)
535 return (a->size - b->size);
537 if ((a->flags & XTENSA_PROP_ALIGN) != (b->flags & XTENSA_PROP_ALIGN))
538 return ((b->flags & XTENSA_PROP_ALIGN)
539 - (a->flags & XTENSA_PROP_ALIGN));
541 if ((a->flags & XTENSA_PROP_ALIGN)
542 && (GET_XTENSA_PROP_ALIGNMENT (a->flags)
543 != GET_XTENSA_PROP_ALIGNMENT (b->flags)))
544 return (GET_XTENSA_PROP_ALIGNMENT (a->flags)
545 - GET_XTENSA_PROP_ALIGNMENT (b->flags));
547 if ((a->flags & XTENSA_PROP_UNREACHABLE)
548 != (b->flags & XTENSA_PROP_UNREACHABLE))
549 return ((b->flags & XTENSA_PROP_UNREACHABLE)
550 - (a->flags & XTENSA_PROP_UNREACHABLE));
552 return (a->flags - b->flags);
555 return (a->address - b->address);
560 property_table_matches (const void *ap, const void *bp)
562 const property_table_entry *a = (const property_table_entry *) ap;
563 const property_table_entry *b = (const property_table_entry *) bp;
565 /* Check if one entry overlaps with the other. */
566 if ((b->address >= a->address && b->address < (a->address + a->size))
567 || (a->address >= b->address && a->address < (b->address + b->size)))
570 return (a->address - b->address);
574 /* Get the literal table or property table entries for the given
575 section. Sets TABLE_P and returns the number of entries. On
576 error, returns a negative value. */
579 xtensa_read_table_entries (bfd *abfd,
581 property_table_entry **table_p,
582 const char *sec_name,
583 bfd_boolean output_addr)
585 asection *table_section;
586 char *table_section_name;
587 bfd_size_type table_size = 0;
588 bfd_byte *table_data;
589 property_table_entry *blocks;
591 bfd_size_type num_records;
592 Elf_Internal_Rela *internal_relocs;
593 bfd_vma section_addr;
594 flagword predef_flags;
595 bfd_size_type table_entry_size;
598 || !(section->flags & SEC_ALLOC)
599 || (section->flags & SEC_DEBUGGING))
605 table_section_name = xtensa_get_property_section_name (section, sec_name);
606 table_section = bfd_get_section_by_name (abfd, table_section_name);
607 free (table_section_name);
609 table_size = table_section->size;
617 predef_flags = xtensa_get_property_predef_flags (table_section);
618 table_entry_size = 12;
620 table_entry_size -= 4;
622 num_records = table_size / table_entry_size;
623 table_data = retrieve_contents (abfd, table_section, TRUE);
624 blocks = (property_table_entry *)
625 bfd_malloc (num_records * sizeof (property_table_entry));
629 section_addr = section->output_section->vma + section->output_offset;
631 section_addr = section->vma;
633 /* If the file has not yet been relocated, process the relocations
634 and sort out the table entries that apply to the specified section. */
635 internal_relocs = retrieve_internal_relocs (abfd, table_section, TRUE);
636 if (internal_relocs && !table_section->reloc_done)
640 for (i = 0; i < table_section->reloc_count; i++)
642 Elf_Internal_Rela *rel = &internal_relocs[i];
643 unsigned long r_symndx;
645 if (ELF32_R_TYPE (rel->r_info) == R_XTENSA_NONE)
648 BFD_ASSERT (ELF32_R_TYPE (rel->r_info) == R_XTENSA_32);
649 r_symndx = ELF32_R_SYM (rel->r_info);
651 if (get_elf_r_symndx_section (abfd, r_symndx) == section)
653 bfd_vma sym_off = get_elf_r_symndx_offset (abfd, r_symndx);
654 BFD_ASSERT (sym_off == 0);
655 BFD_ASSERT (rel->r_addend == 0);
656 blocks[block_count].address =
657 (section_addr + sym_off + rel->r_addend
658 + bfd_get_32 (abfd, table_data + rel->r_offset));
659 blocks[block_count].size =
660 bfd_get_32 (abfd, table_data + rel->r_offset + 4);
662 blocks[block_count].flags = predef_flags;
664 blocks[block_count].flags =
665 bfd_get_32 (abfd, table_data + rel->r_offset + 8);
672 /* The file has already been relocated and the addresses are
673 already in the table. */
675 bfd_size_type section_limit = bfd_get_section_limit (abfd, section);
677 for (off = 0; off < table_size; off += table_entry_size)
679 bfd_vma address = bfd_get_32 (abfd, table_data + off);
681 if (address >= section_addr
682 && address < section_addr + section_limit)
684 blocks[block_count].address = address;
685 blocks[block_count].size =
686 bfd_get_32 (abfd, table_data + off + 4);
688 blocks[block_count].flags = predef_flags;
690 blocks[block_count].flags =
691 bfd_get_32 (abfd, table_data + off + 8);
697 release_contents (table_section, table_data);
698 release_internal_relocs (table_section, internal_relocs);
702 /* Now sort them into address order for easy reference. */
703 qsort (blocks, block_count, sizeof (property_table_entry),
704 property_table_compare);
712 static property_table_entry *
713 elf_xtensa_find_property_entry (property_table_entry *property_table,
714 int property_table_size,
717 property_table_entry entry;
718 property_table_entry *rv;
720 if (property_table_size == 0)
723 entry.address = addr;
727 rv = bsearch (&entry, property_table, property_table_size,
728 sizeof (property_table_entry), property_table_matches);
734 elf_xtensa_in_literal_pool (property_table_entry *lit_table,
738 if (elf_xtensa_find_property_entry (lit_table, lit_table_size, addr))
745 /* Look through the relocs for a section during the first phase, and
746 calculate needed space in the dynamic reloc sections. */
749 elf_xtensa_check_relocs (bfd *abfd,
750 struct bfd_link_info *info,
752 const Elf_Internal_Rela *relocs)
754 Elf_Internal_Shdr *symtab_hdr;
755 struct elf_link_hash_entry **sym_hashes;
756 const Elf_Internal_Rela *rel;
757 const Elf_Internal_Rela *rel_end;
759 if (info->relocatable)
762 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
763 sym_hashes = elf_sym_hashes (abfd);
765 rel_end = relocs + sec->reloc_count;
766 for (rel = relocs; rel < rel_end; rel++)
769 unsigned long r_symndx;
770 struct elf_link_hash_entry *h;
772 r_symndx = ELF32_R_SYM (rel->r_info);
773 r_type = ELF32_R_TYPE (rel->r_info);
775 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
777 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
782 if (r_symndx < symtab_hdr->sh_info)
786 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
787 while (h->root.type == bfd_link_hash_indirect
788 || h->root.type == bfd_link_hash_warning)
789 h = (struct elf_link_hash_entry *) h->root.u.i.link;
798 if ((sec->flags & SEC_ALLOC) != 0)
800 if (h->got.refcount <= 0)
803 h->got.refcount += 1;
808 /* If this relocation is against a local symbol, then it's
809 exactly the same as a normal local GOT entry. */
813 if ((sec->flags & SEC_ALLOC) != 0)
815 if (h->plt.refcount <= 0)
821 h->plt.refcount += 1;
823 /* Keep track of the total PLT relocation count even if we
824 don't yet know whether the dynamic sections will be
826 plt_reloc_count += 1;
828 if (elf_hash_table (info)->dynamic_sections_created)
830 if (!add_extra_plt_sections (elf_hash_table (info)->dynobj,
838 if ((sec->flags & SEC_ALLOC) != 0)
840 bfd_signed_vma *local_got_refcounts;
842 /* This is a global offset table entry for a local symbol. */
843 local_got_refcounts = elf_local_got_refcounts (abfd);
844 if (local_got_refcounts == NULL)
848 size = symtab_hdr->sh_info;
849 size *= sizeof (bfd_signed_vma);
850 local_got_refcounts =
851 (bfd_signed_vma *) bfd_zalloc (abfd, size);
852 if (local_got_refcounts == NULL)
854 elf_local_got_refcounts (abfd) = local_got_refcounts;
856 local_got_refcounts[r_symndx] += 1;
863 case R_XTENSA_SLOT0_OP:
864 case R_XTENSA_SLOT1_OP:
865 case R_XTENSA_SLOT2_OP:
866 case R_XTENSA_SLOT3_OP:
867 case R_XTENSA_SLOT4_OP:
868 case R_XTENSA_SLOT5_OP:
869 case R_XTENSA_SLOT6_OP:
870 case R_XTENSA_SLOT7_OP:
871 case R_XTENSA_SLOT8_OP:
872 case R_XTENSA_SLOT9_OP:
873 case R_XTENSA_SLOT10_OP:
874 case R_XTENSA_SLOT11_OP:
875 case R_XTENSA_SLOT12_OP:
876 case R_XTENSA_SLOT13_OP:
877 case R_XTENSA_SLOT14_OP:
878 case R_XTENSA_SLOT0_ALT:
879 case R_XTENSA_SLOT1_ALT:
880 case R_XTENSA_SLOT2_ALT:
881 case R_XTENSA_SLOT3_ALT:
882 case R_XTENSA_SLOT4_ALT:
883 case R_XTENSA_SLOT5_ALT:
884 case R_XTENSA_SLOT6_ALT:
885 case R_XTENSA_SLOT7_ALT:
886 case R_XTENSA_SLOT8_ALT:
887 case R_XTENSA_SLOT9_ALT:
888 case R_XTENSA_SLOT10_ALT:
889 case R_XTENSA_SLOT11_ALT:
890 case R_XTENSA_SLOT12_ALT:
891 case R_XTENSA_SLOT13_ALT:
892 case R_XTENSA_SLOT14_ALT:
893 case R_XTENSA_ASM_EXPAND:
894 case R_XTENSA_ASM_SIMPLIFY:
896 case R_XTENSA_DIFF16:
897 case R_XTENSA_DIFF32:
898 /* Nothing to do for these. */
901 case R_XTENSA_GNU_VTINHERIT:
902 /* This relocation describes the C++ object vtable hierarchy.
903 Reconstruct it for later use during GC. */
904 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
908 case R_XTENSA_GNU_VTENTRY:
909 /* This relocation describes which C++ vtable entries are actually
910 used. Record for later use during GC. */
911 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
925 elf_xtensa_make_sym_local (struct bfd_link_info *info,
926 struct elf_link_hash_entry *h)
930 if (h->plt.refcount > 0)
932 /* Will use RELATIVE relocs instead of JMP_SLOT relocs. */
933 if (h->got.refcount < 0)
935 h->got.refcount += h->plt.refcount;
941 /* Don't need any dynamic relocations at all. */
949 elf_xtensa_hide_symbol (struct bfd_link_info *info,
950 struct elf_link_hash_entry *h,
951 bfd_boolean force_local)
953 /* For a shared link, move the plt refcount to the got refcount to leave
954 space for RELATIVE relocs. */
955 elf_xtensa_make_sym_local (info, h);
957 _bfd_elf_link_hash_hide_symbol (info, h, force_local);
961 /* Return the section that should be marked against GC for a given
965 elf_xtensa_gc_mark_hook (asection *sec,
966 struct bfd_link_info *info ATTRIBUTE_UNUSED,
967 Elf_Internal_Rela *rel,
968 struct elf_link_hash_entry *h,
969 Elf_Internal_Sym *sym)
973 switch (ELF32_R_TYPE (rel->r_info))
975 case R_XTENSA_GNU_VTINHERIT:
976 case R_XTENSA_GNU_VTENTRY:
980 switch (h->root.type)
982 case bfd_link_hash_defined:
983 case bfd_link_hash_defweak:
984 return h->root.u.def.section;
986 case bfd_link_hash_common:
987 return h->root.u.c.p->section;
995 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
1001 /* Update the GOT & PLT entry reference counts
1002 for the section being removed. */
1005 elf_xtensa_gc_sweep_hook (bfd *abfd,
1006 struct bfd_link_info *info ATTRIBUTE_UNUSED,
1008 const Elf_Internal_Rela *relocs)
1010 Elf_Internal_Shdr *symtab_hdr;
1011 struct elf_link_hash_entry **sym_hashes;
1012 bfd_signed_vma *local_got_refcounts;
1013 const Elf_Internal_Rela *rel, *relend;
1015 if ((sec->flags & SEC_ALLOC) == 0)
1018 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1019 sym_hashes = elf_sym_hashes (abfd);
1020 local_got_refcounts = elf_local_got_refcounts (abfd);
1022 relend = relocs + sec->reloc_count;
1023 for (rel = relocs; rel < relend; rel++)
1025 unsigned long r_symndx;
1026 unsigned int r_type;
1027 struct elf_link_hash_entry *h = NULL;
1029 r_symndx = ELF32_R_SYM (rel->r_info);
1030 if (r_symndx >= symtab_hdr->sh_info)
1031 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1033 r_type = ELF32_R_TYPE (rel->r_info);
1039 if (h->got.refcount > 0)
1046 if (h->plt.refcount > 0)
1051 if (local_got_refcounts[r_symndx] > 0)
1052 local_got_refcounts[r_symndx] -= 1;
1064 /* Create all the dynamic sections. */
1067 elf_xtensa_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
1069 flagword flags, noalloc_flags;
1072 /* First do all the standard stuff. */
1073 if (! _bfd_elf_create_dynamic_sections (dynobj, info))
1076 /* Create any extra PLT sections in case check_relocs has already
1077 been called on all the non-dynamic input files. */
1078 if (!add_extra_plt_sections (dynobj, plt_reloc_count))
1081 noalloc_flags = (SEC_HAS_CONTENTS | SEC_IN_MEMORY
1082 | SEC_LINKER_CREATED | SEC_READONLY);
1083 flags = noalloc_flags | SEC_ALLOC | SEC_LOAD;
1085 /* Mark the ".got.plt" section READONLY. */
1086 s = bfd_get_section_by_name (dynobj, ".got.plt");
1088 || ! bfd_set_section_flags (dynobj, s, flags))
1091 /* Create ".rela.got". */
1092 s = bfd_make_section (dynobj, ".rela.got");
1094 || ! bfd_set_section_flags (dynobj, s, flags)
1095 || ! bfd_set_section_alignment (dynobj, s, 2))
1098 /* Create ".got.loc" (literal tables for use by dynamic linker). */
1099 s = bfd_make_section (dynobj, ".got.loc");
1101 || ! bfd_set_section_flags (dynobj, s, flags)
1102 || ! bfd_set_section_alignment (dynobj, s, 2))
1105 /* Create ".xt.lit.plt" (literal table for ".got.plt*"). */
1106 s = bfd_make_section (dynobj, ".xt.lit.plt");
1108 || ! bfd_set_section_flags (dynobj, s, noalloc_flags)
1109 || ! bfd_set_section_alignment (dynobj, s, 2))
1117 add_extra_plt_sections (bfd *dynobj, int count)
1121 /* Iterate over all chunks except 0 which uses the standard ".plt" and
1122 ".got.plt" sections. */
1123 for (chunk = count / PLT_ENTRIES_PER_CHUNK; chunk > 0; chunk--)
1129 /* Stop when we find a section has already been created. */
1130 if (elf_xtensa_get_plt_section (dynobj, chunk))
1133 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1134 | SEC_LINKER_CREATED | SEC_READONLY);
1136 sname = (char *) bfd_malloc (10);
1137 sprintf (sname, ".plt.%u", chunk);
1138 s = bfd_make_section (dynobj, sname);
1140 || ! bfd_set_section_flags (dynobj, s, flags | SEC_CODE)
1141 || ! bfd_set_section_alignment (dynobj, s, 2))
1144 sname = (char *) bfd_malloc (14);
1145 sprintf (sname, ".got.plt.%u", chunk);
1146 s = bfd_make_section (dynobj, sname);
1148 || ! bfd_set_section_flags (dynobj, s, flags)
1149 || ! bfd_set_section_alignment (dynobj, s, 2))
1157 /* Adjust a symbol defined by a dynamic object and referenced by a
1158 regular object. The current definition is in some section of the
1159 dynamic object, but we're not including those sections. We have to
1160 change the definition to something the rest of the link can
1164 elf_xtensa_adjust_dynamic_symbol (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1165 struct elf_link_hash_entry *h)
1167 /* If this is a weak symbol, and there is a real definition, the
1168 processor independent code will have arranged for us to see the
1169 real definition first, and we can just use the same value. */
1172 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1173 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1174 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1175 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1179 /* This is a reference to a symbol defined by a dynamic object. The
1180 reference must go through the GOT, so there's no need for COPY relocs,
1188 elf_xtensa_fix_refcounts (struct elf_link_hash_entry *h, void *arg)
1190 struct bfd_link_info *info = (struct bfd_link_info *) arg;
1192 if (h->root.type == bfd_link_hash_warning)
1193 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1195 if (! xtensa_elf_dynamic_symbol_p (h, info))
1196 elf_xtensa_make_sym_local (info, h);
1203 elf_xtensa_allocate_plt_size (struct elf_link_hash_entry *h, void *arg)
1205 asection *srelplt = (asection *) arg;
1207 if (h->root.type == bfd_link_hash_warning)
1208 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1210 if (h->plt.refcount > 0)
1211 srelplt->size += (h->plt.refcount * sizeof (Elf32_External_Rela));
1218 elf_xtensa_allocate_got_size (struct elf_link_hash_entry *h, void *arg)
1220 asection *srelgot = (asection *) arg;
1222 if (h->root.type == bfd_link_hash_warning)
1223 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1225 if (h->got.refcount > 0)
1226 srelgot->size += (h->got.refcount * sizeof (Elf32_External_Rela));
1233 elf_xtensa_allocate_local_got_size (struct bfd_link_info *info,
1238 for (i = info->input_bfds; i; i = i->link_next)
1240 bfd_signed_vma *local_got_refcounts;
1241 bfd_size_type j, cnt;
1242 Elf_Internal_Shdr *symtab_hdr;
1244 local_got_refcounts = elf_local_got_refcounts (i);
1245 if (!local_got_refcounts)
1248 symtab_hdr = &elf_tdata (i)->symtab_hdr;
1249 cnt = symtab_hdr->sh_info;
1251 for (j = 0; j < cnt; ++j)
1253 if (local_got_refcounts[j] > 0)
1254 srelgot->size += (local_got_refcounts[j]
1255 * sizeof (Elf32_External_Rela));
1261 /* Set the sizes of the dynamic sections. */
1264 elf_xtensa_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
1265 struct bfd_link_info *info)
1268 asection *s, *srelplt, *splt, *sgotplt, *srelgot, *spltlittbl, *sgotloc;
1269 bfd_boolean relplt, relgot;
1270 int plt_entries, plt_chunks, chunk;
1276 dynobj = elf_hash_table (info)->dynobj;
1280 if (elf_hash_table (info)->dynamic_sections_created)
1282 /* Set the contents of the .interp section to the interpreter. */
1283 if (info->executable)
1285 s = bfd_get_section_by_name (dynobj, ".interp");
1288 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
1289 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1292 /* Allocate room for one word in ".got". */
1293 s = bfd_get_section_by_name (dynobj, ".got");
1298 /* Adjust refcounts for symbols that we now know are not "dynamic". */
1299 elf_link_hash_traverse (elf_hash_table (info),
1300 elf_xtensa_fix_refcounts,
1303 /* Allocate space in ".rela.got" for literals that reference
1305 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
1306 if (srelgot == NULL)
1308 elf_link_hash_traverse (elf_hash_table (info),
1309 elf_xtensa_allocate_got_size,
1312 /* If we are generating a shared object, we also need space in
1313 ".rela.got" for R_XTENSA_RELATIVE relocs for literals that
1314 reference local symbols. */
1316 elf_xtensa_allocate_local_got_size (info, srelgot);
1318 /* Allocate space in ".rela.plt" for literals that have PLT entries. */
1319 srelplt = bfd_get_section_by_name (dynobj, ".rela.plt");
1320 if (srelplt == NULL)
1322 elf_link_hash_traverse (elf_hash_table (info),
1323 elf_xtensa_allocate_plt_size,
1326 /* Allocate space in ".plt" to match the size of ".rela.plt". For
1327 each PLT entry, we need the PLT code plus a 4-byte literal.
1328 For each chunk of ".plt", we also need two more 4-byte
1329 literals, two corresponding entries in ".rela.got", and an
1330 8-byte entry in ".xt.lit.plt". */
1331 spltlittbl = bfd_get_section_by_name (dynobj, ".xt.lit.plt");
1332 if (spltlittbl == NULL)
1335 plt_entries = srelplt->size / sizeof (Elf32_External_Rela);
1337 (plt_entries + PLT_ENTRIES_PER_CHUNK - 1) / PLT_ENTRIES_PER_CHUNK;
1339 /* Iterate over all the PLT chunks, including any extra sections
1340 created earlier because the initial count of PLT relocations
1341 was an overestimate. */
1343 (splt = elf_xtensa_get_plt_section (dynobj, chunk)) != NULL;
1348 sgotplt = elf_xtensa_get_gotplt_section (dynobj, chunk);
1349 if (sgotplt == NULL)
1352 if (chunk < plt_chunks - 1)
1353 chunk_entries = PLT_ENTRIES_PER_CHUNK;
1354 else if (chunk == plt_chunks - 1)
1355 chunk_entries = plt_entries - (chunk * PLT_ENTRIES_PER_CHUNK);
1359 if (chunk_entries != 0)
1361 sgotplt->size = 4 * (chunk_entries + 2);
1362 splt->size = PLT_ENTRY_SIZE * chunk_entries;
1363 srelgot->size += 2 * sizeof (Elf32_External_Rela);
1364 spltlittbl->size += 8;
1373 /* Allocate space in ".got.loc" to match the total size of all the
1375 sgotloc = bfd_get_section_by_name (dynobj, ".got.loc");
1376 if (sgotloc == NULL)
1378 sgotloc->size = spltlittbl->size;
1379 for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link_next)
1381 if (abfd->flags & DYNAMIC)
1383 for (s = abfd->sections; s != NULL; s = s->next)
1385 if (! elf_discarded_section (s)
1386 && xtensa_is_littable_section (s)
1388 sgotloc->size += s->size;
1393 /* Allocate memory for dynamic sections. */
1396 for (s = dynobj->sections; s != NULL; s = s->next)
1401 if ((s->flags & SEC_LINKER_CREATED) == 0)
1404 /* It's OK to base decisions on the section name, because none
1405 of the dynobj section names depend upon the input files. */
1406 name = bfd_get_section_name (dynobj, s);
1410 if (strncmp (name, ".rela", 5) == 0)
1412 if (strcmp (name, ".rela.plt") == 0)
1414 else if (strcmp (name, ".rela.got") == 0)
1417 /* We use the reloc_count field as a counter if we need
1418 to copy relocs into the output file. */
1421 else if (strncmp (name, ".plt.", 5) == 0
1422 || strncmp (name, ".got.plt.", 9) == 0)
1426 /* If we don't need this section, strip it from the output
1427 file. We must create the ".plt*" and ".got.plt*"
1428 sections in create_dynamic_sections and/or check_relocs
1429 based on a conservative estimate of the PLT relocation
1430 count, because the sections must be created before the
1431 linker maps input sections to output sections. The
1432 linker does that before size_dynamic_sections, where we
1433 compute the exact size of the PLT, so there may be more
1434 of these sections than are actually needed. */
1438 else if (strcmp (name, ".got") != 0
1439 && strcmp (name, ".plt") != 0
1440 && strcmp (name, ".got.plt") != 0
1441 && strcmp (name, ".xt.lit.plt") != 0
1442 && strcmp (name, ".got.loc") != 0)
1444 /* It's not one of our sections, so don't allocate space. */
1449 _bfd_strip_section_from_output (info, s);
1452 /* Allocate memory for the section contents. */
1453 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
1454 if (s->contents == NULL && s->size != 0)
1459 if (elf_hash_table (info)->dynamic_sections_created)
1461 /* Add the special XTENSA_RTLD relocations now. The offsets won't be
1462 known until finish_dynamic_sections, but we need to get the relocs
1463 in place before they are sorted. */
1464 if (srelgot == NULL)
1466 for (chunk = 0; chunk < plt_chunks; chunk++)
1468 Elf_Internal_Rela irela;
1472 irela.r_info = ELF32_R_INFO (0, R_XTENSA_RTLD);
1475 loc = (srelgot->contents
1476 + srelgot->reloc_count * sizeof (Elf32_External_Rela));
1477 bfd_elf32_swap_reloca_out (output_bfd, &irela, loc);
1478 bfd_elf32_swap_reloca_out (output_bfd, &irela,
1479 loc + sizeof (Elf32_External_Rela));
1480 srelgot->reloc_count += 2;
1483 /* Add some entries to the .dynamic section. We fill in the
1484 values later, in elf_xtensa_finish_dynamic_sections, but we
1485 must add the entries now so that we get the correct size for
1486 the .dynamic section. The DT_DEBUG entry is filled in by the
1487 dynamic linker and used by the debugger. */
1488 #define add_dynamic_entry(TAG, VAL) \
1489 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
1493 if (!add_dynamic_entry (DT_DEBUG, 0))
1499 if (!add_dynamic_entry (DT_PLTGOT, 0)
1500 || !add_dynamic_entry (DT_PLTRELSZ, 0)
1501 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
1502 || !add_dynamic_entry (DT_JMPREL, 0))
1508 if (!add_dynamic_entry (DT_RELA, 0)
1509 || !add_dynamic_entry (DT_RELASZ, 0)
1510 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
1514 if (!add_dynamic_entry (DT_XTENSA_GOT_LOC_OFF, 0)
1515 || !add_dynamic_entry (DT_XTENSA_GOT_LOC_SZ, 0))
1518 #undef add_dynamic_entry
1524 /* Remove any PT_LOAD segments with no allocated sections. Prior to
1525 binutils 2.13, this function used to remove the non-SEC_ALLOC
1526 sections from PT_LOAD segments, but that task has now been moved
1527 into elf.c. We still need this function to remove any empty
1528 segments that result, but there's nothing Xtensa-specific about
1529 this and it probably ought to be moved into elf.c as well. */
1532 elf_xtensa_modify_segment_map (bfd *abfd,
1533 struct bfd_link_info *info ATTRIBUTE_UNUSED)
1535 struct elf_segment_map **m_p;
1537 m_p = &elf_tdata (abfd)->segment_map;
1540 if ((*m_p)->p_type == PT_LOAD && (*m_p)->count == 0)
1541 *m_p = (*m_p)->next;
1543 m_p = &(*m_p)->next;
1549 /* Perform the specified relocation. The instruction at (contents + address)
1550 is modified to set one operand to represent the value in "relocation". The
1551 operand position is determined by the relocation type recorded in the
1554 #define CALL_SEGMENT_BITS (30)
1555 #define CALL_SEGMENT_SIZE (1 << CALL_SEGMENT_BITS)
1557 static bfd_reloc_status_type
1558 elf_xtensa_do_reloc (reloc_howto_type *howto,
1560 asection *input_section,
1564 bfd_boolean is_weak_undef,
1565 char **error_message)
1568 xtensa_opcode opcode;
1569 xtensa_isa isa = xtensa_default_isa;
1570 static xtensa_insnbuf ibuff = NULL;
1571 static xtensa_insnbuf sbuff = NULL;
1572 bfd_vma self_address = 0;
1573 bfd_size_type input_size;
1579 ibuff = xtensa_insnbuf_alloc (isa);
1580 sbuff = xtensa_insnbuf_alloc (isa);
1583 input_size = bfd_get_section_limit (abfd, input_section);
1585 switch (howto->type)
1588 case R_XTENSA_DIFF8:
1589 case R_XTENSA_DIFF16:
1590 case R_XTENSA_DIFF32:
1591 return bfd_reloc_ok;
1593 case R_XTENSA_ASM_EXPAND:
1596 /* Check for windowed CALL across a 1GB boundary. */
1597 xtensa_opcode opcode =
1598 get_expanded_call_opcode (contents + address,
1599 input_size - address, 0);
1600 if (is_windowed_call_opcode (opcode))
1602 self_address = (input_section->output_section->vma
1603 + input_section->output_offset
1605 if ((self_address >> CALL_SEGMENT_BITS)
1606 != (relocation >> CALL_SEGMENT_BITS))
1608 *error_message = "windowed longcall crosses 1GB boundary; "
1610 return bfd_reloc_dangerous;
1614 return bfd_reloc_ok;
1616 case R_XTENSA_ASM_SIMPLIFY:
1618 /* Convert the L32R/CALLX to CALL. */
1619 bfd_reloc_status_type retval =
1620 elf_xtensa_do_asm_simplify (contents, address, input_size,
1622 if (retval != bfd_reloc_ok)
1623 return bfd_reloc_dangerous;
1625 /* The CALL needs to be relocated. Continue below for that part. */
1627 howto = &elf_howto_table[(unsigned) R_XTENSA_SLOT0_OP ];
1635 x = bfd_get_32 (abfd, contents + address);
1637 bfd_put_32 (abfd, x, contents + address);
1639 return bfd_reloc_ok;
1642 /* Only instruction slot-specific relocations handled below.... */
1643 slot = get_relocation_slot (howto->type);
1644 if (slot == XTENSA_UNDEFINED)
1646 *error_message = "unexpected relocation";
1647 return bfd_reloc_dangerous;
1650 /* Read the instruction into a buffer and decode the opcode. */
1651 xtensa_insnbuf_from_chars (isa, ibuff, contents + address,
1652 input_size - address);
1653 fmt = xtensa_format_decode (isa, ibuff);
1654 if (fmt == XTENSA_UNDEFINED)
1656 *error_message = "cannot decode instruction format";
1657 return bfd_reloc_dangerous;
1660 xtensa_format_get_slot (isa, fmt, slot, ibuff, sbuff);
1662 opcode = xtensa_opcode_decode (isa, fmt, slot, sbuff);
1663 if (opcode == XTENSA_UNDEFINED)
1665 *error_message = "cannot decode instruction opcode";
1666 return bfd_reloc_dangerous;
1669 /* Check for opcode-specific "alternate" relocations. */
1670 if (is_alt_relocation (howto->type))
1672 if (opcode == get_l32r_opcode ())
1674 /* Handle the special-case of non-PC-relative L32R instructions. */
1675 bfd *output_bfd = input_section->output_section->owner;
1676 asection *lit4_sec = bfd_get_section_by_name (output_bfd, ".lit4");
1679 *error_message = "relocation references missing .lit4 section";
1680 return bfd_reloc_dangerous;
1682 self_address = ((lit4_sec->vma & ~0xfff)
1683 + 0x40000 - 3); /* -3 to compensate for do_reloc */
1684 newval = relocation;
1687 else if (opcode == get_const16_opcode ())
1689 /* ALT used for high 16 bits. */
1690 newval = relocation >> 16;
1695 /* No other "alternate" relocations currently defined. */
1696 *error_message = "unexpected relocation";
1697 return bfd_reloc_dangerous;
1700 else /* Not an "alternate" relocation.... */
1702 if (opcode == get_const16_opcode ())
1704 newval = relocation & 0xffff;
1709 /* ...normal PC-relative relocation.... */
1711 /* Determine which operand is being relocated. */
1712 opnd = get_relocation_opnd (opcode, howto->type);
1713 if (opnd == XTENSA_UNDEFINED)
1715 *error_message = "unexpected relocation";
1716 return bfd_reloc_dangerous;
1719 if (!howto->pc_relative)
1721 *error_message = "expected PC-relative relocation";
1722 return bfd_reloc_dangerous;
1725 /* Calculate the PC address for this instruction. */
1726 self_address = (input_section->output_section->vma
1727 + input_section->output_offset
1730 newval = relocation;
1734 /* Apply the relocation. */
1735 if (xtensa_operand_do_reloc (isa, opcode, opnd, &newval, self_address)
1736 || xtensa_operand_encode (isa, opcode, opnd, &newval)
1737 || xtensa_operand_set_field (isa, opcode, opnd, fmt, slot,
1740 *error_message = build_encoding_error_message (opcode, relocation);
1741 return bfd_reloc_dangerous;
1744 /* Check for calls across 1GB boundaries. */
1745 if (is_direct_call_opcode (opcode)
1746 && is_windowed_call_opcode (opcode))
1748 if ((self_address >> CALL_SEGMENT_BITS)
1749 != (relocation >> CALL_SEGMENT_BITS))
1752 "windowed call crosses 1GB boundary; return may fail";
1753 return bfd_reloc_dangerous;
1757 /* Write the modified instruction back out of the buffer. */
1758 xtensa_format_set_slot (isa, fmt, slot, ibuff, sbuff);
1759 xtensa_insnbuf_to_chars (isa, ibuff, contents + address,
1760 input_size - address);
1761 return bfd_reloc_ok;
1766 vsprint_msg (const char *origmsg, const char *fmt, int arglen, ...)
1768 /* To reduce the size of the memory leak,
1769 we only use a single message buffer. */
1770 static bfd_size_type alloc_size = 0;
1771 static char *message = NULL;
1772 bfd_size_type orig_len, len = 0;
1773 bfd_boolean is_append;
1775 VA_OPEN (ap, arglen);
1776 VA_FIXEDARG (ap, const char *, origmsg);
1778 is_append = (origmsg == message);
1780 orig_len = strlen (origmsg);
1781 len = orig_len + strlen (fmt) + arglen + 20;
1782 if (len > alloc_size)
1784 message = (char *) bfd_realloc (message, len);
1788 memcpy (message, origmsg, orig_len);
1789 vsprintf (message + orig_len, fmt, ap);
1796 build_encoding_error_message (xtensa_opcode opcode, bfd_vma target_address)
1798 const char *opname = xtensa_opcode_name (xtensa_default_isa, opcode);
1801 msg = "cannot encode";
1802 if (is_direct_call_opcode (opcode))
1804 if ((target_address & 0x3) != 0)
1805 msg = "misaligned call target";
1807 msg = "call target out of range";
1809 else if (opcode == get_l32r_opcode ())
1811 if ((target_address & 0x3) != 0)
1812 msg = "misaligned literal target";
1814 msg = "literal target out of range";
1817 return vsprint_msg (opname, ": %s", strlen (msg) + 2, msg);
1821 /* This function is registered as the "special_function" in the
1822 Xtensa howto for handling simplify operations.
1823 bfd_perform_relocation / bfd_install_relocation use it to
1824 perform (install) the specified relocation. Since this replaces the code
1825 in bfd_perform_relocation, it is basically an Xtensa-specific,
1826 stripped-down version of bfd_perform_relocation. */
1828 static bfd_reloc_status_type
1829 bfd_elf_xtensa_reloc (bfd *abfd,
1830 arelent *reloc_entry,
1833 asection *input_section,
1835 char **error_message)
1838 bfd_reloc_status_type flag;
1839 bfd_size_type octets = reloc_entry->address * bfd_octets_per_byte (abfd);
1840 bfd_vma output_base = 0;
1841 reloc_howto_type *howto = reloc_entry->howto;
1842 asection *reloc_target_output_section;
1843 bfd_boolean is_weak_undef;
1845 /* ELF relocs are against symbols. If we are producing relocatable
1846 output, and the reloc is against an external symbol, the resulting
1847 reloc will also be against the same symbol. In such a case, we
1848 don't want to change anything about the way the reloc is handled,
1849 since it will all be done at final link time. This test is similar
1850 to what bfd_elf_generic_reloc does except that it lets relocs with
1851 howto->partial_inplace go through even if the addend is non-zero.
1852 (The real problem is that partial_inplace is set for XTENSA_32
1853 relocs to begin with, but that's a long story and there's little we
1854 can do about it now....) */
1856 if (output_bfd && (symbol->flags & BSF_SECTION_SYM) == 0)
1858 reloc_entry->address += input_section->output_offset;
1859 return bfd_reloc_ok;
1862 /* Is the address of the relocation really within the section? */
1863 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section))
1864 return bfd_reloc_outofrange;
1866 /* Work out which section the relocation is targeted at and the
1867 initial relocation command value. */
1869 /* Get symbol value. (Common symbols are special.) */
1870 if (bfd_is_com_section (symbol->section))
1873 relocation = symbol->value;
1875 reloc_target_output_section = symbol->section->output_section;
1877 /* Convert input-section-relative symbol value to absolute. */
1878 if ((output_bfd && !howto->partial_inplace)
1879 || reloc_target_output_section == NULL)
1882 output_base = reloc_target_output_section->vma;
1884 relocation += output_base + symbol->section->output_offset;
1886 /* Add in supplied addend. */
1887 relocation += reloc_entry->addend;
1889 /* Here the variable relocation holds the final address of the
1890 symbol we are relocating against, plus any addend. */
1893 if (!howto->partial_inplace)
1895 /* This is a partial relocation, and we want to apply the relocation
1896 to the reloc entry rather than the raw data. Everything except
1897 relocations against section symbols has already been handled
1900 BFD_ASSERT (symbol->flags & BSF_SECTION_SYM);
1901 reloc_entry->addend = relocation;
1902 reloc_entry->address += input_section->output_offset;
1903 return bfd_reloc_ok;
1907 reloc_entry->address += input_section->output_offset;
1908 reloc_entry->addend = 0;
1912 is_weak_undef = (bfd_is_und_section (symbol->section)
1913 && (symbol->flags & BSF_WEAK) != 0);
1914 flag = elf_xtensa_do_reloc (howto, abfd, input_section, relocation,
1915 (bfd_byte *) data, (bfd_vma) octets,
1916 is_weak_undef, error_message);
1918 if (flag == bfd_reloc_dangerous)
1920 /* Add the symbol name to the error message. */
1921 if (! *error_message)
1922 *error_message = "";
1923 *error_message = vsprint_msg (*error_message, ": (%s + 0x%lx)",
1924 strlen (symbol->name) + 17,
1925 symbol->name, reloc_entry->addend);
1932 /* Set up an entry in the procedure linkage table. */
1935 elf_xtensa_create_plt_entry (bfd *dynobj,
1937 unsigned reloc_index)
1939 asection *splt, *sgotplt;
1940 bfd_vma plt_base, got_base;
1941 bfd_vma code_offset, lit_offset;
1944 chunk = reloc_index / PLT_ENTRIES_PER_CHUNK;
1945 splt = elf_xtensa_get_plt_section (dynobj, chunk);
1946 sgotplt = elf_xtensa_get_gotplt_section (dynobj, chunk);
1947 BFD_ASSERT (splt != NULL && sgotplt != NULL);
1949 plt_base = splt->output_section->vma + splt->output_offset;
1950 got_base = sgotplt->output_section->vma + sgotplt->output_offset;
1952 lit_offset = 8 + (reloc_index % PLT_ENTRIES_PER_CHUNK) * 4;
1953 code_offset = (reloc_index % PLT_ENTRIES_PER_CHUNK) * PLT_ENTRY_SIZE;
1955 /* Fill in the literal entry. This is the offset of the dynamic
1956 relocation entry. */
1957 bfd_put_32 (output_bfd, reloc_index * sizeof (Elf32_External_Rela),
1958 sgotplt->contents + lit_offset);
1960 /* Fill in the entry in the procedure linkage table. */
1961 memcpy (splt->contents + code_offset,
1962 (bfd_big_endian (output_bfd)
1963 ? elf_xtensa_be_plt_entry
1964 : elf_xtensa_le_plt_entry),
1966 bfd_put_16 (output_bfd, l32r_offset (got_base + 0,
1967 plt_base + code_offset + 3),
1968 splt->contents + code_offset + 4);
1969 bfd_put_16 (output_bfd, l32r_offset (got_base + 4,
1970 plt_base + code_offset + 6),
1971 splt->contents + code_offset + 7);
1972 bfd_put_16 (output_bfd, l32r_offset (got_base + lit_offset,
1973 plt_base + code_offset + 9),
1974 splt->contents + code_offset + 10);
1976 return plt_base + code_offset;
1980 /* Relocate an Xtensa ELF section. This is invoked by the linker for
1981 both relocatable and final links. */
1984 elf_xtensa_relocate_section (bfd *output_bfd,
1985 struct bfd_link_info *info,
1987 asection *input_section,
1989 Elf_Internal_Rela *relocs,
1990 Elf_Internal_Sym *local_syms,
1991 asection **local_sections)
1993 Elf_Internal_Shdr *symtab_hdr;
1994 Elf_Internal_Rela *rel;
1995 Elf_Internal_Rela *relend;
1996 struct elf_link_hash_entry **sym_hashes;
1997 asection *srelgot, *srelplt;
1999 property_table_entry *lit_table = 0;
2001 char *error_message = NULL;
2002 bfd_size_type input_size;
2004 if (!xtensa_default_isa)
2005 xtensa_default_isa = xtensa_isa_init (0, 0);
2007 dynobj = elf_hash_table (info)->dynobj;
2008 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
2009 sym_hashes = elf_sym_hashes (input_bfd);
2015 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");;
2016 srelplt = bfd_get_section_by_name (dynobj, ".rela.plt");
2019 if (elf_hash_table (info)->dynamic_sections_created)
2021 ltblsize = xtensa_read_table_entries (input_bfd, input_section,
2022 &lit_table, XTENSA_LIT_SEC_NAME,
2028 input_size = bfd_get_section_limit (input_bfd, input_section);
2031 relend = relocs + input_section->reloc_count;
2032 for (; rel < relend; rel++)
2035 reloc_howto_type *howto;
2036 unsigned long r_symndx;
2037 struct elf_link_hash_entry *h;
2038 Elf_Internal_Sym *sym;
2041 bfd_reloc_status_type r;
2042 bfd_boolean is_weak_undef;
2043 bfd_boolean unresolved_reloc;
2046 r_type = ELF32_R_TYPE (rel->r_info);
2047 if (r_type == (int) R_XTENSA_GNU_VTINHERIT
2048 || r_type == (int) R_XTENSA_GNU_VTENTRY)
2051 if (r_type < 0 || r_type >= (int) R_XTENSA_max)
2053 bfd_set_error (bfd_error_bad_value);
2056 howto = &elf_howto_table[r_type];
2058 r_symndx = ELF32_R_SYM (rel->r_info);
2060 if (info->relocatable)
2062 /* This is a relocatable link.
2063 1) If the reloc is against a section symbol, adjust
2064 according to the output section.
2065 2) If there is a new target for this relocation,
2066 the new target will be in the same output section.
2067 We adjust the relocation by the output section
2070 if (relaxing_section)
2072 /* Check if this references a section in another input file. */
2073 if (!do_fix_for_relocatable_link (rel, input_bfd, input_section,
2076 r_type = ELF32_R_TYPE (rel->r_info);
2079 if (r_type == R_XTENSA_ASM_SIMPLIFY)
2081 char *error_message = NULL;
2082 /* Convert ASM_SIMPLIFY into the simpler relocation
2083 so that they never escape a relaxing link. */
2084 r = contract_asm_expansion (contents, input_size, rel,
2086 if (r != bfd_reloc_ok)
2088 if (!((*info->callbacks->reloc_dangerous)
2089 (info, error_message, input_bfd, input_section,
2093 r_type = ELF32_R_TYPE (rel->r_info);
2096 /* This is a relocatable link, so we don't have to change
2097 anything unless the reloc is against a section symbol,
2098 in which case we have to adjust according to where the
2099 section symbol winds up in the output section. */
2100 if (r_symndx < symtab_hdr->sh_info)
2102 sym = local_syms + r_symndx;
2103 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
2105 sec = local_sections[r_symndx];
2106 rel->r_addend += sec->output_offset + sym->st_value;
2110 /* If there is an addend with a partial_inplace howto,
2111 then move the addend to the contents. This is a hack
2112 to work around problems with DWARF in relocatable links
2113 with some previous version of BFD. Now we can't easily get
2114 rid of the hack without breaking backward compatibility.... */
2117 howto = &elf_howto_table[r_type];
2118 if (howto->partial_inplace)
2120 r = elf_xtensa_do_reloc (howto, input_bfd, input_section,
2121 rel->r_addend, contents,
2122 rel->r_offset, FALSE,
2124 if (r != bfd_reloc_ok)
2126 if (!((*info->callbacks->reloc_dangerous)
2127 (info, error_message, input_bfd, input_section,
2135 /* Done with work for relocatable link; continue with next reloc. */
2139 /* This is a final link. */
2144 is_weak_undef = FALSE;
2145 unresolved_reloc = FALSE;
2148 if (howto->partial_inplace)
2150 /* Because R_XTENSA_32 was made partial_inplace to fix some
2151 problems with DWARF info in partial links, there may be
2152 an addend stored in the contents. Take it out of there
2153 and move it back into the addend field of the reloc. */
2154 rel->r_addend += bfd_get_32 (input_bfd, contents + rel->r_offset);
2155 bfd_put_32 (input_bfd, 0, contents + rel->r_offset);
2158 if (r_symndx < symtab_hdr->sh_info)
2160 sym = local_syms + r_symndx;
2161 sec = local_sections[r_symndx];
2162 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
2166 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2167 r_symndx, symtab_hdr, sym_hashes,
2169 unresolved_reloc, warned);
2172 && !unresolved_reloc
2173 && h->root.type == bfd_link_hash_undefweak)
2174 is_weak_undef = TRUE;
2177 if (relaxing_section)
2179 /* Check if this references a section in another input file. */
2180 do_fix_for_final_link (rel, input_bfd, input_section, contents,
2183 /* Update some already cached values. */
2184 r_type = ELF32_R_TYPE (rel->r_info);
2185 howto = &elf_howto_table[r_type];
2188 /* Sanity check the address. */
2189 if (rel->r_offset >= input_size
2190 && ELF32_R_TYPE (rel->r_info) != R_XTENSA_NONE)
2192 (*_bfd_error_handler)
2193 (_("%B(%A+0x%lx): relocation offset out of range (size=0x%x)"),
2194 input_bfd, input_section, rel->r_offset, input_size);
2195 bfd_set_error (bfd_error_bad_value);
2199 /* Generate dynamic relocations. */
2200 if (elf_hash_table (info)->dynamic_sections_created)
2202 bfd_boolean dynamic_symbol = xtensa_elf_dynamic_symbol_p (h, info);
2204 if (dynamic_symbol && is_operand_relocation (r_type))
2206 /* This is an error. The symbol's real value won't be known
2207 until runtime and it's likely to be out of range anyway. */
2208 const char *name = h->root.root.string;
2209 error_message = vsprint_msg ("invalid relocation for dynamic "
2211 strlen (name) + 2, name);
2212 if (!((*info->callbacks->reloc_dangerous)
2213 (info, error_message, input_bfd, input_section,
2217 else if ((r_type == R_XTENSA_32 || r_type == R_XTENSA_PLT)
2218 && (input_section->flags & SEC_ALLOC) != 0
2219 && (dynamic_symbol || info->shared))
2221 Elf_Internal_Rela outrel;
2225 if (dynamic_symbol && r_type == R_XTENSA_PLT)
2230 BFD_ASSERT (srel != NULL);
2233 _bfd_elf_section_offset (output_bfd, info,
2234 input_section, rel->r_offset);
2236 if ((outrel.r_offset | 1) == (bfd_vma) -1)
2237 memset (&outrel, 0, sizeof outrel);
2240 outrel.r_offset += (input_section->output_section->vma
2241 + input_section->output_offset);
2243 /* Complain if the relocation is in a read-only section
2244 and not in a literal pool. */
2245 if ((input_section->flags & SEC_READONLY) != 0
2246 && !elf_xtensa_in_literal_pool (lit_table, ltblsize,
2250 _("dynamic relocation in read-only section");
2251 if (!((*info->callbacks->reloc_dangerous)
2252 (info, error_message, input_bfd, input_section,
2259 outrel.r_addend = rel->r_addend;
2262 if (r_type == R_XTENSA_32)
2265 ELF32_R_INFO (h->dynindx, R_XTENSA_GLOB_DAT);
2268 else /* r_type == R_XTENSA_PLT */
2271 ELF32_R_INFO (h->dynindx, R_XTENSA_JMP_SLOT);
2273 /* Create the PLT entry and set the initial
2274 contents of the literal entry to the address of
2277 elf_xtensa_create_plt_entry (dynobj, output_bfd,
2280 unresolved_reloc = FALSE;
2284 /* Generate a RELATIVE relocation. */
2285 outrel.r_info = ELF32_R_INFO (0, R_XTENSA_RELATIVE);
2286 outrel.r_addend = 0;
2290 loc = (srel->contents
2291 + srel->reloc_count++ * sizeof (Elf32_External_Rela));
2292 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2293 BFD_ASSERT (sizeof (Elf32_External_Rela) * srel->reloc_count
2298 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
2299 because such sections are not SEC_ALLOC and thus ld.so will
2300 not process them. */
2301 if (unresolved_reloc
2302 && !((input_section->flags & SEC_DEBUGGING) != 0
2304 (*_bfd_error_handler)
2305 (_("%B(%A+0x%lx): unresolvable relocation against symbol `%s'"),
2308 (long) rel->r_offset,
2309 h->root.root.string);
2311 /* There's no point in calling bfd_perform_relocation here.
2312 Just go directly to our "special function". */
2313 r = elf_xtensa_do_reloc (howto, input_bfd, input_section,
2314 relocation + rel->r_addend,
2315 contents, rel->r_offset, is_weak_undef,
2318 if (r != bfd_reloc_ok && !warned)
2322 BFD_ASSERT (r == bfd_reloc_dangerous || r == bfd_reloc_other);
2323 BFD_ASSERT (error_message != NULL);
2326 name = h->root.root.string;
2329 name = bfd_elf_string_from_elf_section
2330 (input_bfd, symtab_hdr->sh_link, sym->st_name);
2331 if (name && *name == '\0')
2332 name = bfd_section_name (input_bfd, sec);
2336 if (rel->r_addend == 0)
2337 error_message = vsprint_msg (error_message, ": %s",
2338 strlen (name) + 2, name);
2340 error_message = vsprint_msg (error_message, ": (%s+0x%x)",
2342 name, rel->r_addend);
2345 if (!((*info->callbacks->reloc_dangerous)
2346 (info, error_message, input_bfd, input_section,
2355 input_section->reloc_done = TRUE;
2361 /* Finish up dynamic symbol handling. There's not much to do here since
2362 the PLT and GOT entries are all set up by relocate_section. */
2365 elf_xtensa_finish_dynamic_symbol (bfd *output_bfd ATTRIBUTE_UNUSED,
2366 struct bfd_link_info *info ATTRIBUTE_UNUSED,
2367 struct elf_link_hash_entry *h,
2368 Elf_Internal_Sym *sym)
2373 /* Mark the symbol as undefined, rather than as defined in
2374 the .plt section. Leave the value alone. */
2375 sym->st_shndx = SHN_UNDEF;
2378 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
2379 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
2380 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
2381 sym->st_shndx = SHN_ABS;
2387 /* Combine adjacent literal table entries in the output. Adjacent
2388 entries within each input section may have been removed during
2389 relaxation, but we repeat the process here, even though it's too late
2390 to shrink the output section, because it's important to minimize the
2391 number of literal table entries to reduce the start-up work for the
2392 runtime linker. Returns the number of remaining table entries or -1
2396 elf_xtensa_combine_prop_entries (bfd *output_bfd,
2401 property_table_entry *table;
2402 bfd_size_type section_size, sgotloc_size;
2406 section_size = sxtlit->size;
2407 BFD_ASSERT (section_size % 8 == 0);
2408 num = section_size / 8;
2410 sgotloc_size = sgotloc->size;
2411 if (sgotloc_size != section_size)
2413 (*_bfd_error_handler)
2414 (_("internal inconsistency in size of .got.loc section"));
2418 table = bfd_malloc (num * sizeof (property_table_entry));
2422 /* The ".xt.lit.plt" section has the SEC_IN_MEMORY flag set and this
2423 propagates to the output section, where it doesn't really apply and
2424 where it breaks the following call to bfd_malloc_and_get_section. */
2425 sxtlit->flags &= ~SEC_IN_MEMORY;
2427 if (!bfd_malloc_and_get_section (output_bfd, sxtlit, &contents))
2435 /* There should never be any relocations left at this point, so this
2436 is quite a bit easier than what is done during relaxation. */
2438 /* Copy the raw contents into a property table array and sort it. */
2440 for (n = 0; n < num; n++)
2442 table[n].address = bfd_get_32 (output_bfd, &contents[offset]);
2443 table[n].size = bfd_get_32 (output_bfd, &contents[offset + 4]);
2446 qsort (table, num, sizeof (property_table_entry), property_table_compare);
2448 for (n = 0; n < num; n++)
2450 bfd_boolean remove = FALSE;
2452 if (table[n].size == 0)
2455 (table[n-1].address + table[n-1].size == table[n].address))
2457 table[n-1].size += table[n].size;
2463 for (m = n; m < num - 1; m++)
2465 table[m].address = table[m+1].address;
2466 table[m].size = table[m+1].size;
2474 /* Copy the data back to the raw contents. */
2476 for (n = 0; n < num; n++)
2478 bfd_put_32 (output_bfd, table[n].address, &contents[offset]);
2479 bfd_put_32 (output_bfd, table[n].size, &contents[offset + 4]);
2483 /* Clear the removed bytes. */
2484 if ((bfd_size_type) (num * 8) < section_size)
2485 memset (&contents[num * 8], 0, section_size - num * 8);
2487 if (! bfd_set_section_contents (output_bfd, sxtlit, contents, 0,
2491 /* Copy the contents to ".got.loc". */
2492 memcpy (sgotloc->contents, contents, section_size);
2500 /* Finish up the dynamic sections. */
2503 elf_xtensa_finish_dynamic_sections (bfd *output_bfd,
2504 struct bfd_link_info *info)
2507 asection *sdyn, *srelplt, *sgot, *sxtlit, *sgotloc;
2508 Elf32_External_Dyn *dyncon, *dynconend;
2509 int num_xtlit_entries;
2511 if (! elf_hash_table (info)->dynamic_sections_created)
2514 dynobj = elf_hash_table (info)->dynobj;
2515 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
2516 BFD_ASSERT (sdyn != NULL);
2518 /* Set the first entry in the global offset table to the address of
2519 the dynamic section. */
2520 sgot = bfd_get_section_by_name (dynobj, ".got");
2523 BFD_ASSERT (sgot->size == 4);
2525 bfd_put_32 (output_bfd, 0, sgot->contents);
2527 bfd_put_32 (output_bfd,
2528 sdyn->output_section->vma + sdyn->output_offset,
2532 srelplt = bfd_get_section_by_name (dynobj, ".rela.plt");
2533 if (srelplt && srelplt->size != 0)
2535 asection *sgotplt, *srelgot, *spltlittbl;
2536 int chunk, plt_chunks, plt_entries;
2537 Elf_Internal_Rela irela;
2539 unsigned rtld_reloc;
2541 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");;
2542 BFD_ASSERT (srelgot != NULL);
2544 spltlittbl = bfd_get_section_by_name (dynobj, ".xt.lit.plt");
2545 BFD_ASSERT (spltlittbl != NULL);
2547 /* Find the first XTENSA_RTLD relocation. Presumably the rest
2548 of them follow immediately after.... */
2549 for (rtld_reloc = 0; rtld_reloc < srelgot->reloc_count; rtld_reloc++)
2551 loc = srelgot->contents + rtld_reloc * sizeof (Elf32_External_Rela);
2552 bfd_elf32_swap_reloca_in (output_bfd, loc, &irela);
2553 if (ELF32_R_TYPE (irela.r_info) == R_XTENSA_RTLD)
2556 BFD_ASSERT (rtld_reloc < srelgot->reloc_count);
2558 plt_entries = srelplt->size / sizeof (Elf32_External_Rela);
2560 (plt_entries + PLT_ENTRIES_PER_CHUNK - 1) / PLT_ENTRIES_PER_CHUNK;
2562 for (chunk = 0; chunk < plt_chunks; chunk++)
2564 int chunk_entries = 0;
2566 sgotplt = elf_xtensa_get_gotplt_section (dynobj, chunk);
2567 BFD_ASSERT (sgotplt != NULL);
2569 /* Emit special RTLD relocations for the first two entries in
2570 each chunk of the .got.plt section. */
2572 loc = srelgot->contents + rtld_reloc * sizeof (Elf32_External_Rela);
2573 bfd_elf32_swap_reloca_in (output_bfd, loc, &irela);
2574 BFD_ASSERT (ELF32_R_TYPE (irela.r_info) == R_XTENSA_RTLD);
2575 irela.r_offset = (sgotplt->output_section->vma
2576 + sgotplt->output_offset);
2577 irela.r_addend = 1; /* tell rtld to set value to resolver function */
2578 bfd_elf32_swap_reloca_out (output_bfd, &irela, loc);
2580 BFD_ASSERT (rtld_reloc <= srelgot->reloc_count);
2582 /* Next literal immediately follows the first. */
2583 loc += sizeof (Elf32_External_Rela);
2584 bfd_elf32_swap_reloca_in (output_bfd, loc, &irela);
2585 BFD_ASSERT (ELF32_R_TYPE (irela.r_info) == R_XTENSA_RTLD);
2586 irela.r_offset = (sgotplt->output_section->vma
2587 + sgotplt->output_offset + 4);
2588 /* Tell rtld to set value to object's link map. */
2590 bfd_elf32_swap_reloca_out (output_bfd, &irela, loc);
2592 BFD_ASSERT (rtld_reloc <= srelgot->reloc_count);
2594 /* Fill in the literal table. */
2595 if (chunk < plt_chunks - 1)
2596 chunk_entries = PLT_ENTRIES_PER_CHUNK;
2598 chunk_entries = plt_entries - (chunk * PLT_ENTRIES_PER_CHUNK);
2600 BFD_ASSERT ((unsigned) (chunk + 1) * 8 <= spltlittbl->size);
2601 bfd_put_32 (output_bfd,
2602 sgotplt->output_section->vma + sgotplt->output_offset,
2603 spltlittbl->contents + (chunk * 8) + 0);
2604 bfd_put_32 (output_bfd,
2605 8 + (chunk_entries * 4),
2606 spltlittbl->contents + (chunk * 8) + 4);
2609 /* All the dynamic relocations have been emitted at this point.
2610 Make sure the relocation sections are the correct size. */
2611 if (srelgot->size != (sizeof (Elf32_External_Rela)
2612 * srelgot->reloc_count)
2613 || srelplt->size != (sizeof (Elf32_External_Rela)
2614 * srelplt->reloc_count))
2617 /* The .xt.lit.plt section has just been modified. This must
2618 happen before the code below which combines adjacent literal
2619 table entries, and the .xt.lit.plt contents have to be forced to
2621 if (! bfd_set_section_contents (output_bfd,
2622 spltlittbl->output_section,
2623 spltlittbl->contents,
2624 spltlittbl->output_offset,
2627 /* Clear SEC_HAS_CONTENTS so the contents won't be output again. */
2628 spltlittbl->flags &= ~SEC_HAS_CONTENTS;
2631 /* Combine adjacent literal table entries. */
2632 BFD_ASSERT (! info->relocatable);
2633 sxtlit = bfd_get_section_by_name (output_bfd, ".xt.lit");
2634 sgotloc = bfd_get_section_by_name (dynobj, ".got.loc");
2635 BFD_ASSERT (sxtlit && sgotloc);
2637 elf_xtensa_combine_prop_entries (output_bfd, sxtlit, sgotloc);
2638 if (num_xtlit_entries < 0)
2641 dyncon = (Elf32_External_Dyn *) sdyn->contents;
2642 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
2643 for (; dyncon < dynconend; dyncon++)
2645 Elf_Internal_Dyn dyn;
2649 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
2656 case DT_XTENSA_GOT_LOC_SZ:
2657 dyn.d_un.d_val = num_xtlit_entries;
2660 case DT_XTENSA_GOT_LOC_OFF:
2669 s = bfd_get_section_by_name (output_bfd, name);
2671 dyn.d_un.d_ptr = s->vma;
2675 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2677 dyn.d_un.d_val = s->size;
2681 /* Adjust RELASZ to not include JMPREL. This matches what
2682 glibc expects and what is done for several other ELF
2683 targets (e.g., i386, alpha), but the "correct" behavior
2684 seems to be unresolved. Since the linker script arranges
2685 for .rela.plt to follow all other relocation sections, we
2686 don't have to worry about changing the DT_RELA entry. */
2687 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2689 dyn.d_un.d_val -= s->size;
2693 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2700 /* Functions for dealing with the e_flags field. */
2702 /* Merge backend specific data from an object file to the output
2703 object file when linking. */
2706 elf_xtensa_merge_private_bfd_data (bfd *ibfd, bfd *obfd)
2708 unsigned out_mach, in_mach;
2709 flagword out_flag, in_flag;
2711 /* Check if we have the same endianess. */
2712 if (!_bfd_generic_verify_endian_match (ibfd, obfd))
2715 /* Don't even pretend to support mixed-format linking. */
2716 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
2717 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
2720 out_flag = elf_elfheader (obfd)->e_flags;
2721 in_flag = elf_elfheader (ibfd)->e_flags;
2723 out_mach = out_flag & EF_XTENSA_MACH;
2724 in_mach = in_flag & EF_XTENSA_MACH;
2725 if (out_mach != in_mach)
2727 (*_bfd_error_handler)
2728 (_("%B: incompatible machine type. Output is 0x%x. Input is 0x%x"),
2729 ibfd, out_mach, in_mach);
2730 bfd_set_error (bfd_error_wrong_format);
2734 if (! elf_flags_init (obfd))
2736 elf_flags_init (obfd) = TRUE;
2737 elf_elfheader (obfd)->e_flags = in_flag;
2739 if (bfd_get_arch (obfd) == bfd_get_arch (ibfd)
2740 && bfd_get_arch_info (obfd)->the_default)
2741 return bfd_set_arch_mach (obfd, bfd_get_arch (ibfd),
2742 bfd_get_mach (ibfd));
2747 if ((out_flag & EF_XTENSA_XT_INSN) != (in_flag & EF_XTENSA_XT_INSN))
2748 elf_elfheader (obfd)->e_flags &= (~ EF_XTENSA_XT_INSN);
2750 if ((out_flag & EF_XTENSA_XT_LIT) != (in_flag & EF_XTENSA_XT_LIT))
2751 elf_elfheader (obfd)->e_flags &= (~ EF_XTENSA_XT_LIT);
2758 elf_xtensa_set_private_flags (bfd *abfd, flagword flags)
2760 BFD_ASSERT (!elf_flags_init (abfd)
2761 || elf_elfheader (abfd)->e_flags == flags);
2763 elf_elfheader (abfd)->e_flags |= flags;
2764 elf_flags_init (abfd) = TRUE;
2771 elf_xtensa_get_private_bfd_flags (bfd *abfd)
2773 return elf_elfheader (abfd)->e_flags;
2778 elf_xtensa_print_private_bfd_data (bfd *abfd, void *farg)
2780 FILE *f = (FILE *) farg;
2781 flagword e_flags = elf_elfheader (abfd)->e_flags;
2783 fprintf (f, "\nXtensa header:\n");
2784 if ((e_flags & EF_XTENSA_MACH) == E_XTENSA_MACH)
2785 fprintf (f, "\nMachine = Base\n");
2787 fprintf (f, "\nMachine Id = 0x%x\n", e_flags & EF_XTENSA_MACH);
2789 fprintf (f, "Insn tables = %s\n",
2790 (e_flags & EF_XTENSA_XT_INSN) ? "true" : "false");
2792 fprintf (f, "Literal tables = %s\n",
2793 (e_flags & EF_XTENSA_XT_LIT) ? "true" : "false");
2795 return _bfd_elf_print_private_bfd_data (abfd, farg);
2799 /* Set the right machine number for an Xtensa ELF file. */
2802 elf_xtensa_object_p (bfd *abfd)
2805 unsigned long arch = elf_elfheader (abfd)->e_flags & EF_XTENSA_MACH;
2810 mach = bfd_mach_xtensa;
2816 (void) bfd_default_set_arch_mach (abfd, bfd_arch_xtensa, mach);
2821 /* The final processing done just before writing out an Xtensa ELF object
2822 file. This gets the Xtensa architecture right based on the machine
2826 elf_xtensa_final_write_processing (bfd *abfd,
2827 bfd_boolean linker ATTRIBUTE_UNUSED)
2832 switch (mach = bfd_get_mach (abfd))
2834 case bfd_mach_xtensa:
2835 val = E_XTENSA_MACH;
2841 elf_elfheader (abfd)->e_flags &= (~ EF_XTENSA_MACH);
2842 elf_elfheader (abfd)->e_flags |= val;
2846 static enum elf_reloc_type_class
2847 elf_xtensa_reloc_type_class (const Elf_Internal_Rela *rela)
2849 switch ((int) ELF32_R_TYPE (rela->r_info))
2851 case R_XTENSA_RELATIVE:
2852 return reloc_class_relative;
2853 case R_XTENSA_JMP_SLOT:
2854 return reloc_class_plt;
2856 return reloc_class_normal;
2862 elf_xtensa_discard_info_for_section (bfd *abfd,
2863 struct elf_reloc_cookie *cookie,
2864 struct bfd_link_info *info,
2868 bfd_vma section_size;
2869 bfd_vma offset, actual_offset;
2870 size_t removed_bytes = 0;
2872 section_size = sec->size;
2873 if (section_size == 0 || section_size % 8 != 0)
2876 if (sec->output_section
2877 && bfd_is_abs_section (sec->output_section))
2880 contents = retrieve_contents (abfd, sec, info->keep_memory);
2884 cookie->rels = retrieve_internal_relocs (abfd, sec, info->keep_memory);
2887 release_contents (sec, contents);
2891 cookie->rel = cookie->rels;
2892 cookie->relend = cookie->rels + sec->reloc_count;
2894 for (offset = 0; offset < section_size; offset += 8)
2896 actual_offset = offset - removed_bytes;
2898 /* The ...symbol_deleted_p function will skip over relocs but it
2899 won't adjust their offsets, so do that here. */
2900 while (cookie->rel < cookie->relend
2901 && cookie->rel->r_offset < offset)
2903 cookie->rel->r_offset -= removed_bytes;
2907 while (cookie->rel < cookie->relend
2908 && cookie->rel->r_offset == offset)
2910 if (bfd_elf_reloc_symbol_deleted_p (offset, cookie))
2912 /* Remove the table entry. (If the reloc type is NONE, then
2913 the entry has already been merged with another and deleted
2914 during relaxation.) */
2915 if (ELF32_R_TYPE (cookie->rel->r_info) != R_XTENSA_NONE)
2917 /* Shift the contents up. */
2918 if (offset + 8 < section_size)
2919 memmove (&contents[actual_offset],
2920 &contents[actual_offset+8],
2921 section_size - offset - 8);
2925 /* Remove this relocation. */
2926 cookie->rel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
2929 /* Adjust the relocation offset for previous removals. This
2930 should not be done before calling ...symbol_deleted_p
2931 because it might mess up the offset comparisons there.
2932 Make sure the offset doesn't underflow in the case where
2933 the first entry is removed. */
2934 if (cookie->rel->r_offset >= removed_bytes)
2935 cookie->rel->r_offset -= removed_bytes;
2937 cookie->rel->r_offset = 0;
2943 if (removed_bytes != 0)
2945 /* Adjust any remaining relocs (shouldn't be any). */
2946 for (; cookie->rel < cookie->relend; cookie->rel++)
2948 if (cookie->rel->r_offset >= removed_bytes)
2949 cookie->rel->r_offset -= removed_bytes;
2951 cookie->rel->r_offset = 0;
2954 /* Clear the removed bytes. */
2955 memset (&contents[section_size - removed_bytes], 0, removed_bytes);
2957 pin_contents (sec, contents);
2958 pin_internal_relocs (sec, cookie->rels);
2961 sec->size = section_size - removed_bytes;
2963 if (xtensa_is_littable_section (sec))
2965 bfd *dynobj = elf_hash_table (info)->dynobj;
2969 bfd_get_section_by_name (dynobj, ".got.loc");
2971 sgotloc->size -= removed_bytes;
2977 release_contents (sec, contents);
2978 release_internal_relocs (sec, cookie->rels);
2981 return (removed_bytes != 0);
2986 elf_xtensa_discard_info (bfd *abfd,
2987 struct elf_reloc_cookie *cookie,
2988 struct bfd_link_info *info)
2991 bfd_boolean changed = FALSE;
2993 for (sec = abfd->sections; sec != NULL; sec = sec->next)
2995 if (xtensa_is_property_section (sec))
2997 if (elf_xtensa_discard_info_for_section (abfd, cookie, info, sec))
3007 elf_xtensa_ignore_discarded_relocs (asection *sec)
3009 return xtensa_is_property_section (sec);
3013 /* Support for core dump NOTE sections. */
3016 elf_xtensa_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
3021 /* The size for Xtensa is variable, so don't try to recognize the format
3022 based on the size. Just assume this is GNU/Linux. */
3025 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12);
3028 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24);
3032 size = note->descsz - offset - 4;
3034 /* Make a ".reg/999" section. */
3035 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
3036 size, note->descpos + offset);
3041 elf_xtensa_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
3043 switch (note->descsz)
3048 case 128: /* GNU/Linux elf_prpsinfo */
3049 elf_tdata (abfd)->core_program
3050 = _bfd_elfcore_strndup (abfd, note->descdata + 32, 16);
3051 elf_tdata (abfd)->core_command
3052 = _bfd_elfcore_strndup (abfd, note->descdata + 48, 80);
3055 /* Note that for some reason, a spurious space is tacked
3056 onto the end of the args in some (at least one anyway)
3057 implementations, so strip it off if it exists. */
3060 char *command = elf_tdata (abfd)->core_command;
3061 int n = strlen (command);
3063 if (0 < n && command[n - 1] == ' ')
3064 command[n - 1] = '\0';
3071 /* Generic Xtensa configurability stuff. */
3073 static xtensa_opcode callx0_op = XTENSA_UNDEFINED;
3074 static xtensa_opcode callx4_op = XTENSA_UNDEFINED;
3075 static xtensa_opcode callx8_op = XTENSA_UNDEFINED;
3076 static xtensa_opcode callx12_op = XTENSA_UNDEFINED;
3077 static xtensa_opcode call0_op = XTENSA_UNDEFINED;
3078 static xtensa_opcode call4_op = XTENSA_UNDEFINED;
3079 static xtensa_opcode call8_op = XTENSA_UNDEFINED;
3080 static xtensa_opcode call12_op = XTENSA_UNDEFINED;
3083 init_call_opcodes (void)
3085 if (callx0_op == XTENSA_UNDEFINED)
3087 callx0_op = xtensa_opcode_lookup (xtensa_default_isa, "callx0");
3088 callx4_op = xtensa_opcode_lookup (xtensa_default_isa, "callx4");
3089 callx8_op = xtensa_opcode_lookup (xtensa_default_isa, "callx8");
3090 callx12_op = xtensa_opcode_lookup (xtensa_default_isa, "callx12");
3091 call0_op = xtensa_opcode_lookup (xtensa_default_isa, "call0");
3092 call4_op = xtensa_opcode_lookup (xtensa_default_isa, "call4");
3093 call8_op = xtensa_opcode_lookup (xtensa_default_isa, "call8");
3094 call12_op = xtensa_opcode_lookup (xtensa_default_isa, "call12");
3100 is_indirect_call_opcode (xtensa_opcode opcode)
3102 init_call_opcodes ();
3103 return (opcode == callx0_op
3104 || opcode == callx4_op
3105 || opcode == callx8_op
3106 || opcode == callx12_op);
3111 is_direct_call_opcode (xtensa_opcode opcode)
3113 init_call_opcodes ();
3114 return (opcode == call0_op
3115 || opcode == call4_op
3116 || opcode == call8_op
3117 || opcode == call12_op);
3122 is_windowed_call_opcode (xtensa_opcode opcode)
3124 init_call_opcodes ();
3125 return (opcode == call4_op
3126 || opcode == call8_op
3127 || opcode == call12_op
3128 || opcode == callx4_op
3129 || opcode == callx8_op
3130 || opcode == callx12_op);
3134 static xtensa_opcode
3135 get_const16_opcode (void)
3137 static bfd_boolean done_lookup = FALSE;
3138 static xtensa_opcode const16_opcode = XTENSA_UNDEFINED;
3141 const16_opcode = xtensa_opcode_lookup (xtensa_default_isa, "const16");
3144 return const16_opcode;
3148 static xtensa_opcode
3149 get_l32r_opcode (void)
3151 static xtensa_opcode l32r_opcode = XTENSA_UNDEFINED;
3152 static bfd_boolean done_lookup = FALSE;
3156 l32r_opcode = xtensa_opcode_lookup (xtensa_default_isa, "l32r");
3164 l32r_offset (bfd_vma addr, bfd_vma pc)
3168 offset = addr - ((pc+3) & -4);
3169 BFD_ASSERT ((offset & ((1 << 2) - 1)) == 0);
3170 offset = (signed int) offset >> 2;
3171 BFD_ASSERT ((signed int) offset >> 16 == -1);
3177 get_relocation_opnd (xtensa_opcode opcode, int r_type)
3179 xtensa_isa isa = xtensa_default_isa;
3180 int last_immed, last_opnd, opi;
3182 if (opcode == XTENSA_UNDEFINED)
3183 return XTENSA_UNDEFINED;
3185 /* Find the last visible PC-relative immediate operand for the opcode.
3186 If there are no PC-relative immediates, then choose the last visible
3187 immediate; otherwise, fail and return XTENSA_UNDEFINED. */
3188 last_immed = XTENSA_UNDEFINED;
3189 last_opnd = xtensa_opcode_num_operands (isa, opcode);
3190 for (opi = last_opnd - 1; opi >= 0; opi--)
3192 if (xtensa_operand_is_visible (isa, opcode, opi) == 0)
3194 if (xtensa_operand_is_PCrelative (isa, opcode, opi) == 1)
3199 if (last_immed == XTENSA_UNDEFINED
3200 && xtensa_operand_is_register (isa, opcode, opi) == 0)
3204 return XTENSA_UNDEFINED;
3206 /* If the operand number was specified in an old-style relocation,
3207 check for consistency with the operand computed above. */
3208 if (r_type >= R_XTENSA_OP0 && r_type <= R_XTENSA_OP2)
3210 int reloc_opnd = r_type - R_XTENSA_OP0;
3211 if (reloc_opnd != last_immed)
3212 return XTENSA_UNDEFINED;
3220 get_relocation_slot (int r_type)
3230 if (r_type >= R_XTENSA_SLOT0_OP && r_type <= R_XTENSA_SLOT14_OP)
3231 return r_type - R_XTENSA_SLOT0_OP;
3232 if (r_type >= R_XTENSA_SLOT0_ALT && r_type <= R_XTENSA_SLOT14_ALT)
3233 return r_type - R_XTENSA_SLOT0_ALT;
3237 return XTENSA_UNDEFINED;
3241 /* Get the opcode for a relocation. */
3243 static xtensa_opcode
3244 get_relocation_opcode (bfd *abfd,
3247 Elf_Internal_Rela *irel)
3249 static xtensa_insnbuf ibuff = NULL;
3250 static xtensa_insnbuf sbuff = NULL;
3251 xtensa_isa isa = xtensa_default_isa;
3255 if (contents == NULL)
3256 return XTENSA_UNDEFINED;
3258 if (bfd_get_section_limit (abfd, sec) <= irel->r_offset)
3259 return XTENSA_UNDEFINED;
3263 ibuff = xtensa_insnbuf_alloc (isa);
3264 sbuff = xtensa_insnbuf_alloc (isa);
3267 /* Decode the instruction. */
3268 xtensa_insnbuf_from_chars (isa, ibuff, &contents[irel->r_offset],
3269 sec->size - irel->r_offset);
3270 fmt = xtensa_format_decode (isa, ibuff);
3271 slot = get_relocation_slot (ELF32_R_TYPE (irel->r_info));
3272 if (slot == XTENSA_UNDEFINED)
3273 return XTENSA_UNDEFINED;
3274 xtensa_format_get_slot (isa, fmt, slot, ibuff, sbuff);
3275 return xtensa_opcode_decode (isa, fmt, slot, sbuff);
3280 is_l32r_relocation (bfd *abfd,
3283 Elf_Internal_Rela *irel)
3285 xtensa_opcode opcode;
3286 if (!is_operand_relocation (ELF32_R_TYPE (irel->r_info)))
3288 opcode = get_relocation_opcode (abfd, sec, contents, irel);
3289 return (opcode == get_l32r_opcode ());
3293 static bfd_size_type
3294 get_asm_simplify_size (bfd_byte *contents,
3295 bfd_size_type content_len,
3296 bfd_size_type offset)
3298 bfd_size_type insnlen, size = 0;
3300 /* Decode the size of the next two instructions. */
3301 insnlen = insn_decode_len (contents, content_len, offset);
3307 insnlen = insn_decode_len (contents, content_len, offset + size);
3317 is_alt_relocation (int r_type)
3319 return (r_type >= R_XTENSA_SLOT0_ALT
3320 && r_type <= R_XTENSA_SLOT14_ALT);
3325 is_operand_relocation (int r_type)
3335 if (r_type >= R_XTENSA_SLOT0_OP && r_type <= R_XTENSA_SLOT14_OP)
3337 if (r_type >= R_XTENSA_SLOT0_ALT && r_type <= R_XTENSA_SLOT14_ALT)
3346 #define MIN_INSN_LENGTH 2
3348 /* Return 0 if it fails to decode. */
3351 insn_decode_len (bfd_byte *contents,
3352 bfd_size_type content_len,
3353 bfd_size_type offset)
3356 xtensa_isa isa = xtensa_default_isa;
3358 static xtensa_insnbuf ibuff = NULL;
3360 if (offset + MIN_INSN_LENGTH > content_len)
3364 ibuff = xtensa_insnbuf_alloc (isa);
3365 xtensa_insnbuf_from_chars (isa, ibuff, &contents[offset],
3366 content_len - offset);
3367 fmt = xtensa_format_decode (isa, ibuff);
3368 if (fmt == XTENSA_UNDEFINED)
3370 insn_len = xtensa_format_length (isa, fmt);
3371 if (insn_len == XTENSA_UNDEFINED)
3377 /* Decode the opcode for a single slot instruction.
3378 Return 0 if it fails to decode or the instruction is multi-slot. */
3381 insn_decode_opcode (bfd_byte *contents,
3382 bfd_size_type content_len,
3383 bfd_size_type offset,
3386 xtensa_isa isa = xtensa_default_isa;
3388 static xtensa_insnbuf insnbuf = NULL;
3389 static xtensa_insnbuf slotbuf = NULL;
3391 if (offset + MIN_INSN_LENGTH > content_len)
3392 return XTENSA_UNDEFINED;
3394 if (insnbuf == NULL)
3396 insnbuf = xtensa_insnbuf_alloc (isa);
3397 slotbuf = xtensa_insnbuf_alloc (isa);
3400 xtensa_insnbuf_from_chars (isa, insnbuf, &contents[offset],
3401 content_len - offset);
3402 fmt = xtensa_format_decode (isa, insnbuf);
3403 if (fmt == XTENSA_UNDEFINED)
3404 return XTENSA_UNDEFINED;
3406 if (slot >= xtensa_format_num_slots (isa, fmt))
3407 return XTENSA_UNDEFINED;
3409 xtensa_format_get_slot (isa, fmt, slot, insnbuf, slotbuf);
3410 return xtensa_opcode_decode (isa, fmt, slot, slotbuf);
3414 /* The offset is the offset in the contents.
3415 The address is the address of that offset. */
3418 check_branch_target_aligned (bfd_byte *contents,
3419 bfd_size_type content_length,
3423 bfd_size_type insn_len = insn_decode_len (contents, content_length, offset);
3426 return check_branch_target_aligned_address (address, insn_len);
3431 check_loop_aligned (bfd_byte *contents,
3432 bfd_size_type content_length,
3436 bfd_size_type loop_len, insn_len;
3437 xtensa_opcode opcode =
3438 insn_decode_opcode (contents, content_length, offset, 0);
3439 BFD_ASSERT (opcode != XTENSA_UNDEFINED);
3440 if (opcode != XTENSA_UNDEFINED)
3442 BFD_ASSERT (xtensa_opcode_is_loop (xtensa_default_isa, opcode));
3443 if (!xtensa_opcode_is_loop (xtensa_default_isa, opcode))
3446 loop_len = insn_decode_len (contents, content_length, offset);
3447 BFD_ASSERT (loop_len != 0);
3451 insn_len = insn_decode_len (contents, content_length, offset + loop_len);
3452 BFD_ASSERT (insn_len != 0);
3456 return check_branch_target_aligned_address (address + loop_len, insn_len);
3461 check_branch_target_aligned_address (bfd_vma addr, int len)
3464 return (addr % 8 == 0);
3465 return ((addr >> 2) == ((addr + len - 1) >> 2));
3469 /* Instruction widening and narrowing. */
3471 /* When FLIX is available we need to access certain instructions only
3472 when they are 16-bit or 24-bit instructions. This table caches
3473 information about such instructions by walking through all the
3474 opcodes and finding the smallest single-slot format into which each
3477 static xtensa_format *op_single_fmt_table = NULL;
3481 init_op_single_format_table (void)
3483 xtensa_isa isa = xtensa_default_isa;
3484 xtensa_insnbuf ibuf;
3485 xtensa_opcode opcode;
3489 if (op_single_fmt_table)
3492 ibuf = xtensa_insnbuf_alloc (isa);
3493 num_opcodes = xtensa_isa_num_opcodes (isa);
3495 op_single_fmt_table = (xtensa_format *)
3496 bfd_malloc (sizeof (xtensa_format) * num_opcodes);
3497 for (opcode = 0; opcode < num_opcodes; opcode++)
3499 op_single_fmt_table[opcode] = XTENSA_UNDEFINED;
3500 for (fmt = 0; fmt < xtensa_isa_num_formats (isa); fmt++)
3502 if (xtensa_format_num_slots (isa, fmt) == 1
3503 && xtensa_opcode_encode (isa, fmt, 0, ibuf, opcode) == 0)
3505 xtensa_opcode old_fmt = op_single_fmt_table[opcode];
3506 int fmt_length = xtensa_format_length (isa, fmt);
3507 if (old_fmt == XTENSA_UNDEFINED
3508 || fmt_length < xtensa_format_length (isa, old_fmt))
3509 op_single_fmt_table[opcode] = fmt;
3513 xtensa_insnbuf_free (isa, ibuf);
3517 static xtensa_format
3518 get_single_format (xtensa_opcode opcode)
3520 init_op_single_format_table ();
3521 return op_single_fmt_table[opcode];
3525 /* For the set of narrowable instructions we do NOT include the
3526 narrowings beqz -> beqz.n or bnez -> bnez.n because of complexities
3527 involved during linker relaxation that may require these to
3528 re-expand in some conditions. Also, the narrowing "or" -> mov.n
3529 requires special case code to ensure it only works when op1 == op2. */
3537 struct string_pair narrowable[] =
3540 { "addi", "addi.n" },
3541 { "addmi", "addi.n" },
3542 { "l32i", "l32i.n" },
3543 { "movi", "movi.n" },
3545 { "retw", "retw.n" },
3546 { "s32i", "s32i.n" },
3547 { "or", "mov.n" } /* special case only when op1 == op2 */
3550 struct string_pair widenable[] =
3553 { "addi", "addi.n" },
3554 { "addmi", "addi.n" },
3555 { "beqz", "beqz.n" },
3556 { "bnez", "bnez.n" },
3557 { "l32i", "l32i.n" },
3558 { "movi", "movi.n" },
3560 { "retw", "retw.n" },
3561 { "s32i", "s32i.n" },
3562 { "or", "mov.n" } /* special case only when op1 == op2 */
3566 /* Attempt to narrow an instruction. Return true if the narrowing is
3567 valid. If the do_it parameter is non-zero, then perform the action
3568 in-place directly into the contents. Otherwise, do not modify the
3569 contents. The set of valid narrowing are specified by a string table
3570 but require some special case operand checks in some cases. */
3573 narrow_instruction (bfd_byte *contents,
3574 bfd_size_type content_length,
3575 bfd_size_type offset,
3578 xtensa_opcode opcode;
3579 bfd_size_type insn_len, opi;
3580 xtensa_isa isa = xtensa_default_isa;
3581 xtensa_format fmt, o_fmt;
3583 static xtensa_insnbuf insnbuf = NULL;
3584 static xtensa_insnbuf slotbuf = NULL;
3585 static xtensa_insnbuf o_insnbuf = NULL;
3586 static xtensa_insnbuf o_slotbuf = NULL;
3588 if (insnbuf == NULL)
3590 insnbuf = xtensa_insnbuf_alloc (isa);
3591 slotbuf = xtensa_insnbuf_alloc (isa);
3592 o_insnbuf = xtensa_insnbuf_alloc (isa);
3593 o_slotbuf = xtensa_insnbuf_alloc (isa);
3596 BFD_ASSERT (offset < content_length);
3598 if (content_length < 2)
3601 /* We will hand-code a few of these for a little while.
3602 These have all been specified in the assembler aleady. */
3603 xtensa_insnbuf_from_chars (isa, insnbuf, &contents[offset],
3604 content_length - offset);
3605 fmt = xtensa_format_decode (isa, insnbuf);
3606 if (xtensa_format_num_slots (isa, fmt) != 1)
3609 if (xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf) != 0)
3612 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
3613 if (opcode == XTENSA_UNDEFINED)
3615 insn_len = xtensa_format_length (isa, fmt);
3616 if (insn_len > content_length)
3619 for (opi = 0; opi < (sizeof (narrowable)/sizeof (struct string_pair)); ++opi)
3621 bfd_boolean is_or = (strcmp ("or", narrowable[opi].wide) == 0);
3623 if (opcode == xtensa_opcode_lookup (isa, narrowable[opi].wide))
3625 uint32 value, newval;
3626 int i, operand_count, o_operand_count;
3627 xtensa_opcode o_opcode;
3629 /* Address does not matter in this case. We might need to
3630 fix it to handle branches/jumps. */
3631 bfd_vma self_address = 0;
3633 o_opcode = xtensa_opcode_lookup (isa, narrowable[opi].narrow);
3634 if (o_opcode == XTENSA_UNDEFINED)
3636 o_fmt = get_single_format (o_opcode);
3637 if (o_fmt == XTENSA_UNDEFINED)
3640 if (xtensa_format_length (isa, fmt) != 3
3641 || xtensa_format_length (isa, o_fmt) != 2)
3644 xtensa_format_encode (isa, o_fmt, o_slotbuf);
3645 xtensa_format_encode (isa, o_fmt, o_insnbuf);
3646 operand_count = xtensa_opcode_num_operands (isa, opcode);
3647 o_operand_count = xtensa_opcode_num_operands (isa, o_opcode);
3649 if (xtensa_opcode_encode (isa, o_fmt, 0, o_slotbuf, o_opcode) != 0)
3654 if (xtensa_opcode_num_operands (isa, o_opcode) != operand_count)
3659 uint32 rawval0, rawval1, rawval2;
3661 if (o_operand_count + 1 != operand_count)
3663 if (xtensa_operand_get_field (isa, opcode, 0,
3664 fmt, 0, slotbuf, &rawval0) != 0)
3666 if (xtensa_operand_get_field (isa, opcode, 1,
3667 fmt, 0, slotbuf, &rawval1) != 0)
3669 if (xtensa_operand_get_field (isa, opcode, 2,
3670 fmt, 0, slotbuf, &rawval2) != 0)
3673 if (rawval1 != rawval2)
3675 if (rawval0 == rawval1) /* it is a nop */
3679 for (i = 0; i < o_operand_count; ++i)
3681 if (xtensa_operand_get_field (isa, opcode, i, fmt, 0,
3683 || xtensa_operand_decode (isa, opcode, i, &value))
3686 /* PC-relative branches need adjustment, but
3687 the PC-rel operand will always have a relocation. */
3689 if (xtensa_operand_do_reloc (isa, o_opcode, i, &newval,
3691 || xtensa_operand_encode (isa, o_opcode, i, &newval)
3692 || xtensa_operand_set_field (isa, o_opcode, i, o_fmt, 0,
3697 if (xtensa_format_set_slot (isa, o_fmt, 0,
3698 o_insnbuf, o_slotbuf) != 0)
3702 xtensa_insnbuf_to_chars (isa, o_insnbuf, contents + offset,
3703 content_length - offset);
3711 /* Attempt to widen an instruction. Return true if the widening is
3712 valid. If the do_it parameter is non-zero, then the action should
3713 be performed inplace into the contents. Otherwise, do not modify
3714 the contents. The set of valid widenings are specified by a string
3715 table but require some special case operand checks in some
3719 widen_instruction (bfd_byte *contents,
3720 bfd_size_type content_length,
3721 bfd_size_type offset,
3724 xtensa_opcode opcode;
3725 bfd_size_type insn_len, opi;
3726 xtensa_isa isa = xtensa_default_isa;
3727 xtensa_format fmt, o_fmt;
3729 static xtensa_insnbuf insnbuf = NULL;
3730 static xtensa_insnbuf slotbuf = NULL;
3731 static xtensa_insnbuf o_insnbuf = NULL;
3732 static xtensa_insnbuf o_slotbuf = NULL;
3734 if (insnbuf == NULL)
3736 insnbuf = xtensa_insnbuf_alloc (isa);
3737 slotbuf = xtensa_insnbuf_alloc (isa);
3738 o_insnbuf = xtensa_insnbuf_alloc (isa);
3739 o_slotbuf = xtensa_insnbuf_alloc (isa);
3742 BFD_ASSERT (offset < content_length);
3744 if (content_length < 2)
3747 /* We will hand code a few of these for a little while.
3748 These have all been specified in the assembler aleady. */
3749 xtensa_insnbuf_from_chars (isa, insnbuf, &contents[offset],
3750 content_length - offset);
3751 fmt = xtensa_format_decode (isa, insnbuf);
3752 if (xtensa_format_num_slots (isa, fmt) != 1)
3755 if (xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf) != 0)
3758 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
3759 if (opcode == XTENSA_UNDEFINED)
3761 insn_len = xtensa_format_length (isa, fmt);
3762 if (insn_len > content_length)
3765 for (opi = 0; opi < (sizeof (widenable)/sizeof (struct string_pair)); ++opi)
3767 bfd_boolean is_or = (strcmp ("or", widenable[opi].wide) == 0);
3768 bfd_boolean is_branch = (strcmp ("beqz", widenable[opi].wide) == 0
3769 || strcmp ("bnez", widenable[opi].wide) == 0);
3771 if (opcode == xtensa_opcode_lookup (isa, widenable[opi].narrow))
3773 uint32 value, newval;
3774 int i, operand_count, o_operand_count, check_operand_count;
3775 xtensa_opcode o_opcode;
3777 /* Address does not matter in this case. We might need to fix it
3778 to handle branches/jumps. */
3779 bfd_vma self_address = 0;
3781 o_opcode = xtensa_opcode_lookup (isa, widenable[opi].wide);
3782 if (o_opcode == XTENSA_UNDEFINED)
3784 o_fmt = get_single_format (o_opcode);
3785 if (o_fmt == XTENSA_UNDEFINED)
3788 if (xtensa_format_length (isa, fmt) != 2
3789 || xtensa_format_length (isa, o_fmt) != 3)
3792 xtensa_format_encode (isa, o_fmt, o_slotbuf);
3793 xtensa_format_encode (isa, o_fmt, o_insnbuf);
3794 operand_count = xtensa_opcode_num_operands (isa, opcode);
3795 o_operand_count = xtensa_opcode_num_operands (isa, o_opcode);
3796 check_operand_count = o_operand_count;
3798 if (xtensa_opcode_encode (isa, o_fmt, 0, o_slotbuf, o_opcode) != 0)
3803 if (xtensa_opcode_num_operands (isa, o_opcode) != operand_count)
3808 uint32 rawval0, rawval1;
3810 if (o_operand_count != operand_count + 1)
3812 if (xtensa_operand_get_field (isa, opcode, 0,
3813 fmt, 0, slotbuf, &rawval0) != 0)
3815 if (xtensa_operand_get_field (isa, opcode, 1,
3816 fmt, 0, slotbuf, &rawval1) != 0)
3818 if (rawval0 == rawval1) /* it is a nop */
3822 check_operand_count--;
3824 for (i = 0; i < check_operand_count; ++i)
3827 if (is_or && i == o_operand_count - 1)
3829 if (xtensa_operand_get_field (isa, opcode, new_i, fmt, 0,
3831 || xtensa_operand_decode (isa, opcode, new_i, &value))
3834 /* PC-relative branches need adjustment, but
3835 the PC-rel operand will always have a relocation. */
3837 if (xtensa_operand_do_reloc (isa, o_opcode, i, &newval,
3839 || xtensa_operand_encode (isa, o_opcode, i, &newval)
3840 || xtensa_operand_set_field (isa, o_opcode, i, o_fmt, 0,
3845 if (xtensa_format_set_slot (isa, o_fmt, 0, o_insnbuf, o_slotbuf))
3849 xtensa_insnbuf_to_chars (isa, o_insnbuf, contents + offset,
3850 content_length - offset);
3858 /* Code for transforming CALLs at link-time. */
3860 static bfd_reloc_status_type
3861 elf_xtensa_do_asm_simplify (bfd_byte *contents,
3863 bfd_vma content_length,
3864 char **error_message)
3866 static xtensa_insnbuf insnbuf = NULL;
3867 static xtensa_insnbuf slotbuf = NULL;
3868 xtensa_format core_format = XTENSA_UNDEFINED;
3869 xtensa_opcode opcode;
3870 xtensa_opcode direct_call_opcode;
3871 xtensa_isa isa = xtensa_default_isa;
3872 bfd_byte *chbuf = contents + address;
3875 if (insnbuf == NULL)
3877 insnbuf = xtensa_insnbuf_alloc (isa);
3878 slotbuf = xtensa_insnbuf_alloc (isa);
3881 if (content_length < address)
3883 *error_message = _("Attempt to convert L32R/CALLX to CALL failed");
3884 return bfd_reloc_other;
3887 opcode = get_expanded_call_opcode (chbuf, content_length - address, 0);
3888 direct_call_opcode = swap_callx_for_call_opcode (opcode);
3889 if (direct_call_opcode == XTENSA_UNDEFINED)
3891 *error_message = _("Attempt to convert L32R/CALLX to CALL failed");
3892 return bfd_reloc_other;
3895 /* Assemble a NOP ("or a1, a1, a1") into the 0 byte offset. */
3896 core_format = xtensa_format_lookup (isa, "x24");
3897 opcode = xtensa_opcode_lookup (isa, "or");
3898 xtensa_opcode_encode (isa, core_format, 0, slotbuf, opcode);
3899 for (opn = 0; opn < 3; opn++)
3902 xtensa_operand_encode (isa, opcode, opn, ®no);
3903 xtensa_operand_set_field (isa, opcode, opn, core_format, 0,
3906 xtensa_format_encode (isa, core_format, insnbuf);
3907 xtensa_format_set_slot (isa, core_format, 0, insnbuf, slotbuf);
3908 xtensa_insnbuf_to_chars (isa, insnbuf, chbuf, content_length - address);
3910 /* Assemble a CALL ("callN 0") into the 3 byte offset. */
3911 xtensa_opcode_encode (isa, core_format, 0, slotbuf, direct_call_opcode);
3912 xtensa_operand_set_field (isa, opcode, 0, core_format, 0, slotbuf, 0);
3914 xtensa_format_encode (isa, core_format, insnbuf);
3915 xtensa_format_set_slot (isa, core_format, 0, insnbuf, slotbuf);
3916 xtensa_insnbuf_to_chars (isa, insnbuf, chbuf + 3,
3917 content_length - address - 3);
3919 return bfd_reloc_ok;
3923 static bfd_reloc_status_type
3924 contract_asm_expansion (bfd_byte *contents,
3925 bfd_vma content_length,
3926 Elf_Internal_Rela *irel,
3927 char **error_message)
3929 bfd_reloc_status_type retval =
3930 elf_xtensa_do_asm_simplify (contents, irel->r_offset, content_length,
3933 if (retval != bfd_reloc_ok)
3934 return bfd_reloc_dangerous;
3936 /* Update the irel->r_offset field so that the right immediate and
3937 the right instruction are modified during the relocation. */
3938 irel->r_offset += 3;
3939 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), R_XTENSA_SLOT0_OP);
3940 return bfd_reloc_ok;
3944 static xtensa_opcode
3945 swap_callx_for_call_opcode (xtensa_opcode opcode)
3947 init_call_opcodes ();
3949 if (opcode == callx0_op) return call0_op;
3950 if (opcode == callx4_op) return call4_op;
3951 if (opcode == callx8_op) return call8_op;
3952 if (opcode == callx12_op) return call12_op;
3954 /* Return XTENSA_UNDEFINED if the opcode is not an indirect call. */
3955 return XTENSA_UNDEFINED;
3959 /* Check if "buf" is pointing to a "L32R aN; CALLX aN" or "CONST16 aN;
3960 CONST16 aN; CALLX aN" sequence, and if so, return the CALLX opcode.
3961 If not, return XTENSA_UNDEFINED. */
3963 #define L32R_TARGET_REG_OPERAND 0
3964 #define CONST16_TARGET_REG_OPERAND 0
3965 #define CALLN_SOURCE_OPERAND 0
3967 static xtensa_opcode
3968 get_expanded_call_opcode (bfd_byte *buf, int bufsize, bfd_boolean *p_uses_l32r)
3970 static xtensa_insnbuf insnbuf = NULL;
3971 static xtensa_insnbuf slotbuf = NULL;
3973 xtensa_opcode opcode;
3974 xtensa_isa isa = xtensa_default_isa;
3975 uint32 regno, const16_regno, call_regno;
3978 if (insnbuf == NULL)
3980 insnbuf = xtensa_insnbuf_alloc (isa);
3981 slotbuf = xtensa_insnbuf_alloc (isa);
3984 xtensa_insnbuf_from_chars (isa, insnbuf, buf, bufsize);
3985 fmt = xtensa_format_decode (isa, insnbuf);
3986 if (fmt == XTENSA_UNDEFINED
3987 || xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf))
3988 return XTENSA_UNDEFINED;
3990 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
3991 if (opcode == XTENSA_UNDEFINED)
3992 return XTENSA_UNDEFINED;
3994 if (opcode == get_l32r_opcode ())
3997 *p_uses_l32r = TRUE;
3998 if (xtensa_operand_get_field (isa, opcode, L32R_TARGET_REG_OPERAND,
3999 fmt, 0, slotbuf, ®no)
4000 || xtensa_operand_decode (isa, opcode, L32R_TARGET_REG_OPERAND,
4002 return XTENSA_UNDEFINED;
4004 else if (opcode == get_const16_opcode ())
4007 *p_uses_l32r = FALSE;
4008 if (xtensa_operand_get_field (isa, opcode, CONST16_TARGET_REG_OPERAND,
4009 fmt, 0, slotbuf, ®no)
4010 || xtensa_operand_decode (isa, opcode, CONST16_TARGET_REG_OPERAND,
4012 return XTENSA_UNDEFINED;
4014 /* Check that the next instruction is also CONST16. */
4015 offset += xtensa_format_length (isa, fmt);
4016 xtensa_insnbuf_from_chars (isa, insnbuf, buf + offset, bufsize - offset);
4017 fmt = xtensa_format_decode (isa, insnbuf);
4018 if (fmt == XTENSA_UNDEFINED
4019 || xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf))
4020 return XTENSA_UNDEFINED;
4021 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
4022 if (opcode != get_const16_opcode ())
4023 return XTENSA_UNDEFINED;
4025 if (xtensa_operand_get_field (isa, opcode, CONST16_TARGET_REG_OPERAND,
4026 fmt, 0, slotbuf, &const16_regno)
4027 || xtensa_operand_decode (isa, opcode, CONST16_TARGET_REG_OPERAND,
4029 || const16_regno != regno)
4030 return XTENSA_UNDEFINED;
4033 return XTENSA_UNDEFINED;
4035 /* Next instruction should be an CALLXn with operand 0 == regno. */
4036 offset += xtensa_format_length (isa, fmt);
4037 xtensa_insnbuf_from_chars (isa, insnbuf, buf + offset, bufsize - offset);
4038 fmt = xtensa_format_decode (isa, insnbuf);
4039 if (fmt == XTENSA_UNDEFINED
4040 || xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf))
4041 return XTENSA_UNDEFINED;
4042 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
4043 if (opcode == XTENSA_UNDEFINED
4044 || !is_indirect_call_opcode (opcode))
4045 return XTENSA_UNDEFINED;
4047 if (xtensa_operand_get_field (isa, opcode, CALLN_SOURCE_OPERAND,
4048 fmt, 0, slotbuf, &call_regno)
4049 || xtensa_operand_decode (isa, opcode, CALLN_SOURCE_OPERAND,
4051 return XTENSA_UNDEFINED;
4053 if (call_regno != regno)
4054 return XTENSA_UNDEFINED;
4060 /* Data structures used during relaxation. */
4062 /* r_reloc: relocation values. */
4064 /* Through the relaxation process, we need to keep track of the values
4065 that will result from evaluating relocations. The standard ELF
4066 relocation structure is not sufficient for this purpose because we're
4067 operating on multiple input files at once, so we need to know which
4068 input file a relocation refers to. The r_reloc structure thus
4069 records both the input file (bfd) and ELF relocation.
4071 For efficiency, an r_reloc also contains a "target_offset" field to
4072 cache the target-section-relative offset value that is represented by
4075 The r_reloc also contains a virtual offset that allows multiple
4076 inserted literals to be placed at the same "address" with
4077 different offsets. */
4079 typedef struct r_reloc_struct r_reloc;
4081 struct r_reloc_struct
4084 Elf_Internal_Rela rela;
4085 bfd_vma target_offset;
4086 bfd_vma virtual_offset;
4090 /* The r_reloc structure is included by value in literal_value, but not
4091 every literal_value has an associated relocation -- some are simple
4092 constants. In such cases, we set all the fields in the r_reloc
4093 struct to zero. The r_reloc_is_const function should be used to
4094 detect this case. */
4097 r_reloc_is_const (const r_reloc *r_rel)
4099 return (r_rel->abfd == NULL);
4104 r_reloc_get_target_offset (const r_reloc *r_rel)
4106 bfd_vma target_offset;
4107 unsigned long r_symndx;
4109 BFD_ASSERT (!r_reloc_is_const (r_rel));
4110 r_symndx = ELF32_R_SYM (r_rel->rela.r_info);
4111 target_offset = get_elf_r_symndx_offset (r_rel->abfd, r_symndx);
4112 return (target_offset + r_rel->rela.r_addend);
4116 static struct elf_link_hash_entry *
4117 r_reloc_get_hash_entry (const r_reloc *r_rel)
4119 unsigned long r_symndx = ELF32_R_SYM (r_rel->rela.r_info);
4120 return get_elf_r_symndx_hash_entry (r_rel->abfd, r_symndx);
4125 r_reloc_get_section (const r_reloc *r_rel)
4127 unsigned long r_symndx = ELF32_R_SYM (r_rel->rela.r_info);
4128 return get_elf_r_symndx_section (r_rel->abfd, r_symndx);
4133 r_reloc_is_defined (const r_reloc *r_rel)
4139 sec = r_reloc_get_section (r_rel);
4140 if (sec == bfd_abs_section_ptr
4141 || sec == bfd_com_section_ptr
4142 || sec == bfd_und_section_ptr)
4149 r_reloc_init (r_reloc *r_rel,
4151 Elf_Internal_Rela *irel,
4153 bfd_size_type content_length)
4156 reloc_howto_type *howto;
4160 r_rel->rela = *irel;
4162 r_rel->target_offset = r_reloc_get_target_offset (r_rel);
4163 r_rel->virtual_offset = 0;
4164 r_type = ELF32_R_TYPE (r_rel->rela.r_info);
4165 howto = &elf_howto_table[r_type];
4166 if (howto->partial_inplace)
4168 bfd_vma inplace_val;
4169 BFD_ASSERT (r_rel->rela.r_offset < content_length);
4171 inplace_val = bfd_get_32 (abfd, &contents[r_rel->rela.r_offset]);
4172 r_rel->target_offset += inplace_val;
4176 memset (r_rel, 0, sizeof (r_reloc));
4183 print_r_reloc (FILE *fp, const r_reloc *r_rel)
4185 if (r_reloc_is_defined (r_rel))
4187 asection *sec = r_reloc_get_section (r_rel);
4188 fprintf (fp, " %s(%s + ", sec->owner->filename, sec->name);
4190 else if (r_reloc_get_hash_entry (r_rel))
4191 fprintf (fp, " %s + ", r_reloc_get_hash_entry (r_rel)->root.root.string);
4193 fprintf (fp, " ?? + ");
4195 fprintf_vma (fp, r_rel->target_offset);
4196 if (r_rel->virtual_offset)
4198 fprintf (fp, " + ");
4199 fprintf_vma (fp, r_rel->virtual_offset);
4208 /* source_reloc: relocations that reference literals. */
4210 /* To determine whether literals can be coalesced, we need to first
4211 record all the relocations that reference the literals. The
4212 source_reloc structure below is used for this purpose. The
4213 source_reloc entries are kept in a per-literal-section array, sorted
4214 by offset within the literal section (i.e., target offset).
4216 The source_sec and r_rel.rela.r_offset fields identify the source of
4217 the relocation. The r_rel field records the relocation value, i.e.,
4218 the offset of the literal being referenced. The opnd field is needed
4219 to determine the range of the immediate field to which the relocation
4220 applies, so we can determine whether another literal with the same
4221 value is within range. The is_null field is true when the relocation
4222 is being removed (e.g., when an L32R is being removed due to a CALLX
4223 that is converted to a direct CALL). */
4225 typedef struct source_reloc_struct source_reloc;
4227 struct source_reloc_struct
4229 asection *source_sec;
4231 xtensa_opcode opcode;
4233 bfd_boolean is_null;
4234 bfd_boolean is_abs_literal;
4239 init_source_reloc (source_reloc *reloc,
4240 asection *source_sec,
4241 const r_reloc *r_rel,
4242 xtensa_opcode opcode,
4244 bfd_boolean is_abs_literal)
4246 reloc->source_sec = source_sec;
4247 reloc->r_rel = *r_rel;
4248 reloc->opcode = opcode;
4250 reloc->is_null = FALSE;
4251 reloc->is_abs_literal = is_abs_literal;
4255 /* Find the source_reloc for a particular source offset and relocation
4256 type. Note that the array is sorted by _target_ offset, so this is
4257 just a linear search. */
4259 static source_reloc *
4260 find_source_reloc (source_reloc *src_relocs,
4263 Elf_Internal_Rela *irel)
4267 for (i = 0; i < src_count; i++)
4269 if (src_relocs[i].source_sec == sec
4270 && src_relocs[i].r_rel.rela.r_offset == irel->r_offset
4271 && (ELF32_R_TYPE (src_relocs[i].r_rel.rela.r_info)
4272 == ELF32_R_TYPE (irel->r_info)))
4273 return &src_relocs[i];
4281 source_reloc_compare (const void *ap, const void *bp)
4283 const source_reloc *a = (const source_reloc *) ap;
4284 const source_reloc *b = (const source_reloc *) bp;
4286 if (a->r_rel.target_offset != b->r_rel.target_offset)
4287 return (a->r_rel.target_offset - b->r_rel.target_offset);
4289 /* We don't need to sort on these criteria for correctness,
4290 but enforcing a more strict ordering prevents unstable qsort
4291 from behaving differently with different implementations.
4292 Without the code below we get correct but different results
4293 on Solaris 2.7 and 2.8. We would like to always produce the
4294 same results no matter the host. */
4296 if ((!a->is_null) - (!b->is_null))
4297 return ((!a->is_null) - (!b->is_null));
4298 return internal_reloc_compare (&a->r_rel.rela, &b->r_rel.rela);
4302 /* Literal values and value hash tables. */
4304 /* Literals with the same value can be coalesced. The literal_value
4305 structure records the value of a literal: the "r_rel" field holds the
4306 information from the relocation on the literal (if there is one) and
4307 the "value" field holds the contents of the literal word itself.
4309 The value_map structure records a literal value along with the
4310 location of a literal holding that value. The value_map hash table
4311 is indexed by the literal value, so that we can quickly check if a
4312 particular literal value has been seen before and is thus a candidate
4315 typedef struct literal_value_struct literal_value;
4316 typedef struct value_map_struct value_map;
4317 typedef struct value_map_hash_table_struct value_map_hash_table;
4319 struct literal_value_struct
4322 unsigned long value;
4323 bfd_boolean is_abs_literal;
4326 struct value_map_struct
4328 literal_value val; /* The literal value. */
4329 r_reloc loc; /* Location of the literal. */
4333 struct value_map_hash_table_struct
4335 unsigned bucket_count;
4336 value_map **buckets;
4338 bfd_boolean has_last_loc;
4344 init_literal_value (literal_value *lit,
4345 const r_reloc *r_rel,
4346 unsigned long value,
4347 bfd_boolean is_abs_literal)
4349 lit->r_rel = *r_rel;
4351 lit->is_abs_literal = is_abs_literal;
4356 literal_value_equal (const literal_value *src1,
4357 const literal_value *src2,
4358 bfd_boolean final_static_link)
4360 struct elf_link_hash_entry *h1, *h2;
4362 if (r_reloc_is_const (&src1->r_rel) != r_reloc_is_const (&src2->r_rel))
4365 if (r_reloc_is_const (&src1->r_rel))
4366 return (src1->value == src2->value);
4368 if (ELF32_R_TYPE (src1->r_rel.rela.r_info)
4369 != ELF32_R_TYPE (src2->r_rel.rela.r_info))
4372 if (src1->r_rel.target_offset != src2->r_rel.target_offset)
4375 if (src1->r_rel.virtual_offset != src2->r_rel.virtual_offset)
4378 if (src1->value != src2->value)
4381 /* Now check for the same section (if defined) or the same elf_hash
4382 (if undefined or weak). */
4383 h1 = r_reloc_get_hash_entry (&src1->r_rel);
4384 h2 = r_reloc_get_hash_entry (&src2->r_rel);
4385 if (r_reloc_is_defined (&src1->r_rel)
4386 && (final_static_link
4387 || ((!h1 || h1->root.type != bfd_link_hash_defweak)
4388 && (!h2 || h2->root.type != bfd_link_hash_defweak))))
4390 if (r_reloc_get_section (&src1->r_rel)
4391 != r_reloc_get_section (&src2->r_rel))
4396 /* Require that the hash entries (i.e., symbols) be identical. */
4397 if (h1 != h2 || h1 == 0)
4401 if (src1->is_abs_literal != src2->is_abs_literal)
4408 /* Must be power of 2. */
4409 #define INITIAL_HASH_RELOC_BUCKET_COUNT 1024
4411 static value_map_hash_table *
4412 value_map_hash_table_init (void)
4414 value_map_hash_table *values;
4416 values = (value_map_hash_table *)
4417 bfd_zmalloc (sizeof (value_map_hash_table));
4418 values->bucket_count = INITIAL_HASH_RELOC_BUCKET_COUNT;
4420 values->buckets = (value_map **)
4421 bfd_zmalloc (sizeof (value_map *) * values->bucket_count);
4422 if (values->buckets == NULL)
4427 values->has_last_loc = FALSE;
4434 value_map_hash_table_delete (value_map_hash_table *table)
4436 free (table->buckets);
4442 hash_bfd_vma (bfd_vma val)
4444 return (val >> 2) + (val >> 10);
4449 literal_value_hash (const literal_value *src)
4453 hash_val = hash_bfd_vma (src->value);
4454 if (!r_reloc_is_const (&src->r_rel))
4458 hash_val += hash_bfd_vma (src->is_abs_literal * 1000);
4459 hash_val += hash_bfd_vma (src->r_rel.target_offset);
4460 hash_val += hash_bfd_vma (src->r_rel.virtual_offset);
4462 /* Now check for the same section and the same elf_hash. */
4463 if (r_reloc_is_defined (&src->r_rel))
4464 sec_or_hash = r_reloc_get_section (&src->r_rel);
4466 sec_or_hash = r_reloc_get_hash_entry (&src->r_rel);
4467 hash_val += hash_bfd_vma ((bfd_vma) (unsigned) sec_or_hash);
4473 /* Check if the specified literal_value has been seen before. */
4476 value_map_get_cached_value (value_map_hash_table *map,
4477 const literal_value *val,
4478 bfd_boolean final_static_link)
4484 idx = literal_value_hash (val);
4485 idx = idx & (map->bucket_count - 1);
4486 bucket = map->buckets[idx];
4487 for (map_e = bucket; map_e; map_e = map_e->next)
4489 if (literal_value_equal (&map_e->val, val, final_static_link))
4496 /* Record a new literal value. It is illegal to call this if VALUE
4497 already has an entry here. */
4500 add_value_map (value_map_hash_table *map,
4501 const literal_value *val,
4503 bfd_boolean final_static_link)
4505 value_map **bucket_p;
4508 value_map *val_e = (value_map *) bfd_zmalloc (sizeof (value_map));
4511 bfd_set_error (bfd_error_no_memory);
4515 BFD_ASSERT (!value_map_get_cached_value (map, val, final_static_link));
4519 idx = literal_value_hash (val);
4520 idx = idx & (map->bucket_count - 1);
4521 bucket_p = &map->buckets[idx];
4523 val_e->next = *bucket_p;
4526 /* FIXME: Consider resizing the hash table if we get too many entries. */
4532 /* Lists of text actions (ta_) for narrowing, widening, longcall
4533 conversion, space fill, code & literal removal, etc. */
4535 /* The following text actions are generated:
4537 "ta_remove_insn" remove an instruction or instructions
4538 "ta_remove_longcall" convert longcall to call
4539 "ta_convert_longcall" convert longcall to nop/call
4540 "ta_narrow_insn" narrow a wide instruction
4541 "ta_widen" widen a narrow instruction
4542 "ta_fill" add fill or remove fill
4543 removed < 0 is a fill; branches to the fill address will be
4544 changed to address + fill size (e.g., address - removed)
4545 removed >= 0 branches to the fill address will stay unchanged
4546 "ta_remove_literal" remove a literal; this action is
4547 indicated when a literal is removed
4549 "ta_add_literal" insert a new literal; this action is
4550 indicated when a literal has been moved.
4551 It may use a virtual_offset because
4552 multiple literals can be placed at the
4555 For each of these text actions, we also record the number of bytes
4556 removed by performing the text action. In the case of a "ta_widen"
4557 or a "ta_fill" that adds space, the removed_bytes will be negative. */
4559 typedef struct text_action_struct text_action;
4560 typedef struct text_action_list_struct text_action_list;
4561 typedef enum text_action_enum_t text_action_t;
4563 enum text_action_enum_t
4566 ta_remove_insn, /* removed = -size */
4567 ta_remove_longcall, /* removed = -size */
4568 ta_convert_longcall, /* removed = 0 */
4569 ta_narrow_insn, /* removed = -1 */
4570 ta_widen_insn, /* removed = +1 */
4571 ta_fill, /* removed = +size */
4577 /* Structure for a text action record. */
4578 struct text_action_struct
4580 text_action_t action;
4581 asection *sec; /* Optional */
4583 bfd_vma virtual_offset; /* Zero except for adding literals. */
4585 literal_value value; /* Only valid when adding literals. */
4591 /* List of all of the actions taken on a text section. */
4592 struct text_action_list_struct
4598 static text_action *
4599 find_fill_action (text_action_list *l, asection *sec, bfd_vma offset)
4603 /* It is not necessary to fill at the end of a section. */
4604 if (sec->size == offset)
4607 for (m_p = &l->head; *m_p && (*m_p)->offset <= offset; m_p = &(*m_p)->next)
4609 text_action *t = *m_p;
4610 /* When the action is another fill at the same address,
4611 just increase the size. */
4612 if (t->offset == offset && t->action == ta_fill)
4620 compute_removed_action_diff (const text_action *ta,
4624 int removable_space)
4627 int current_removed = 0;
4630 current_removed = ta->removed_bytes;
4632 BFD_ASSERT (ta == NULL || ta->offset == offset);
4633 BFD_ASSERT (ta == NULL || ta->action == ta_fill);
4635 /* It is not necessary to fill at the end of a section. Clean this up. */
4636 if (sec->size == offset)
4637 new_removed = removable_space - 0;
4641 int added = -removed - current_removed;
4642 /* Ignore multiples of the section alignment. */
4643 added = ((1 << sec->alignment_power) - 1) & added;
4644 new_removed = (-added);
4646 /* Modify for removable. */
4647 space = removable_space - new_removed;
4648 new_removed = (removable_space
4649 - (((1 << sec->alignment_power) - 1) & space));
4651 return (new_removed - current_removed);
4656 adjust_fill_action (text_action *ta, int fill_diff)
4658 ta->removed_bytes += fill_diff;
4662 /* Add a modification action to the text. For the case of adding or
4663 removing space, modify any current fill and assume that
4664 "unreachable_space" bytes can be freely contracted. Note that a
4665 negative removed value is a fill. */
4668 text_action_add (text_action_list *l,
4669 text_action_t action,
4677 /* It is not necessary to fill at the end of a section. */
4678 if (action == ta_fill && sec->size == offset)
4681 /* It is not necessary to fill 0 bytes. */
4682 if (action == ta_fill && removed == 0)
4685 for (m_p = &l->head; *m_p && (*m_p)->offset <= offset; m_p = &(*m_p)->next)
4687 text_action *t = *m_p;
4688 /* When the action is another fill at the same address,
4689 just increase the size. */
4690 if (t->offset == offset && t->action == ta_fill && action == ta_fill)
4692 t->removed_bytes += removed;
4697 /* Create a new record and fill it up. */
4698 ta = (text_action *) bfd_zmalloc (sizeof (text_action));
4699 ta->action = action;
4701 ta->offset = offset;
4702 ta->removed_bytes = removed;
4709 text_action_add_literal (text_action_list *l,
4710 text_action_t action,
4712 const literal_value *value,
4717 asection *sec = r_reloc_get_section (loc);
4718 bfd_vma offset = loc->target_offset;
4719 bfd_vma virtual_offset = loc->virtual_offset;
4721 BFD_ASSERT (action == ta_add_literal);
4723 for (m_p = &l->head; *m_p != NULL; m_p = &(*m_p)->next)
4725 if ((*m_p)->offset > offset
4726 && ((*m_p)->offset != offset
4727 || (*m_p)->virtual_offset > virtual_offset))
4731 /* Create a new record and fill it up. */
4732 ta = (text_action *) bfd_zmalloc (sizeof (text_action));
4733 ta->action = action;
4735 ta->offset = offset;
4736 ta->virtual_offset = virtual_offset;
4738 ta->removed_bytes = removed;
4745 offset_with_removed_text (text_action_list *action_list, bfd_vma offset)
4750 for (r = action_list->head; r && r->offset <= offset; r = r->next)
4752 if (r->offset < offset
4753 || (r->action == ta_fill && r->removed_bytes < 0))
4754 removed += r->removed_bytes;
4757 return (offset - removed);
4762 offset_with_removed_text_before_fill (text_action_list *action_list,
4768 for (r = action_list->head; r && r->offset < offset; r = r->next)
4769 removed += r->removed_bytes;
4771 return (offset - removed);
4775 /* The find_insn_action routine will only find non-fill actions. */
4777 static text_action *
4778 find_insn_action (text_action_list *action_list, bfd_vma offset)
4781 for (t = action_list->head; t; t = t->next)
4783 if (t->offset == offset)
4790 case ta_remove_insn:
4791 case ta_remove_longcall:
4792 case ta_convert_longcall:
4793 case ta_narrow_insn:
4796 case ta_remove_literal:
4797 case ta_add_literal:
4810 print_action_list (FILE *fp, text_action_list *action_list)
4814 fprintf (fp, "Text Action\n");
4815 for (r = action_list->head; r != NULL; r = r->next)
4817 const char *t = "unknown";
4820 case ta_remove_insn:
4821 t = "remove_insn"; break;
4822 case ta_remove_longcall:
4823 t = "remove_longcall"; break;
4824 case ta_convert_longcall:
4825 t = "remove_longcall"; break;
4826 case ta_narrow_insn:
4827 t = "narrow_insn"; break;
4829 t = "widen_insn"; break;
4834 case ta_remove_literal:
4835 t = "remove_literal"; break;
4836 case ta_add_literal:
4837 t = "add_literal"; break;
4840 fprintf (fp, "%s: %s[0x%lx] \"%s\" %d\n",
4841 r->sec->owner->filename,
4842 r->sec->name, r->offset, t, r->removed_bytes);
4849 /* Lists of literals being coalesced or removed. */
4851 /* In the usual case, the literal identified by "from" is being
4852 coalesced with another literal identified by "to". If the literal is
4853 unused and is being removed altogether, "to.abfd" will be NULL.
4854 The removed_literal entries are kept on a per-section list, sorted
4855 by the "from" offset field. */
4857 typedef struct removed_literal_struct removed_literal;
4858 typedef struct removed_literal_list_struct removed_literal_list;
4860 struct removed_literal_struct
4864 removed_literal *next;
4867 struct removed_literal_list_struct
4869 removed_literal *head;
4870 removed_literal *tail;
4874 /* Record that the literal at "from" is being removed. If "to" is not
4875 NULL, the "from" literal is being coalesced with the "to" literal. */
4878 add_removed_literal (removed_literal_list *removed_list,
4879 const r_reloc *from,
4882 removed_literal *r, *new_r, *next_r;
4884 new_r = (removed_literal *) bfd_zmalloc (sizeof (removed_literal));
4886 new_r->from = *from;
4890 new_r->to.abfd = NULL;
4893 r = removed_list->head;
4896 removed_list->head = new_r;
4897 removed_list->tail = new_r;
4899 /* Special check for common case of append. */
4900 else if (removed_list->tail->from.target_offset < from->target_offset)
4902 removed_list->tail->next = new_r;
4903 removed_list->tail = new_r;
4907 while (r->from.target_offset < from->target_offset && r->next)
4913 new_r->next = next_r;
4915 removed_list->tail = new_r;
4920 /* Check if the list of removed literals contains an entry for the
4921 given address. Return the entry if found. */
4923 static removed_literal *
4924 find_removed_literal (removed_literal_list *removed_list, bfd_vma addr)
4926 removed_literal *r = removed_list->head;
4927 while (r && r->from.target_offset < addr)
4929 if (r && r->from.target_offset == addr)
4938 print_removed_literals (FILE *fp, removed_literal_list *removed_list)
4941 r = removed_list->head;
4943 fprintf (fp, "Removed Literals\n");
4944 for (; r != NULL; r = r->next)
4946 print_r_reloc (fp, &r->from);
4947 fprintf (fp, " => ");
4948 if (r->to.abfd == NULL)
4949 fprintf (fp, "REMOVED");
4951 print_r_reloc (fp, &r->to);
4959 /* Per-section data for relaxation. */
4961 typedef struct reloc_bfd_fix_struct reloc_bfd_fix;
4963 struct xtensa_relax_info_struct
4965 bfd_boolean is_relaxable_literal_section;
4966 bfd_boolean is_relaxable_asm_section;
4967 int visited; /* Number of times visited. */
4969 source_reloc *src_relocs; /* Array[src_count]. */
4971 int src_next; /* Next src_relocs entry to assign. */
4973 removed_literal_list removed_list;
4974 text_action_list action_list;
4976 reloc_bfd_fix *fix_list;
4977 reloc_bfd_fix *fix_array;
4978 unsigned fix_array_count;
4980 /* Support for expanding the reloc array that is stored
4981 in the section structure. If the relocations have been
4982 reallocated, the newly allocated relocations will be referenced
4983 here along with the actual size allocated. The relocation
4984 count will always be found in the section structure. */
4985 Elf_Internal_Rela *allocated_relocs;
4986 unsigned relocs_count;
4987 unsigned allocated_relocs_count;
4990 struct elf_xtensa_section_data
4992 struct bfd_elf_section_data elf;
4993 xtensa_relax_info relax_info;
4998 elf_xtensa_new_section_hook (bfd *abfd, asection *sec)
5000 struct elf_xtensa_section_data *sdata;
5001 bfd_size_type amt = sizeof (*sdata);
5003 sdata = (struct elf_xtensa_section_data *) bfd_zalloc (abfd, amt);
5006 sec->used_by_bfd = (void *) sdata;
5008 return _bfd_elf_new_section_hook (abfd, sec);
5012 static xtensa_relax_info *
5013 get_xtensa_relax_info (asection *sec)
5015 struct elf_xtensa_section_data *section_data;
5017 /* No info available if no section or if it is an output section. */
5018 if (!sec || sec == sec->output_section)
5021 section_data = (struct elf_xtensa_section_data *) elf_section_data (sec);
5022 return §ion_data->relax_info;
5027 init_xtensa_relax_info (asection *sec)
5029 xtensa_relax_info *relax_info = get_xtensa_relax_info (sec);
5031 relax_info->is_relaxable_literal_section = FALSE;
5032 relax_info->is_relaxable_asm_section = FALSE;
5033 relax_info->visited = 0;
5035 relax_info->src_relocs = NULL;
5036 relax_info->src_count = 0;
5037 relax_info->src_next = 0;
5039 relax_info->removed_list.head = NULL;
5040 relax_info->removed_list.tail = NULL;
5042 relax_info->action_list.head = NULL;
5044 relax_info->fix_list = NULL;
5045 relax_info->fix_array = NULL;
5046 relax_info->fix_array_count = 0;
5048 relax_info->allocated_relocs = NULL;
5049 relax_info->relocs_count = 0;
5050 relax_info->allocated_relocs_count = 0;
5054 /* Coalescing literals may require a relocation to refer to a section in
5055 a different input file, but the standard relocation information
5056 cannot express that. Instead, the reloc_bfd_fix structures are used
5057 to "fix" the relocations that refer to sections in other input files.
5058 These structures are kept on per-section lists. The "src_type" field
5059 records the relocation type in case there are multiple relocations on
5060 the same location. FIXME: This is ugly; an alternative might be to
5061 add new symbols with the "owner" field to some other input file. */
5063 struct reloc_bfd_fix_struct
5067 unsigned src_type; /* Relocation type. */
5070 asection *target_sec;
5071 bfd_vma target_offset;
5072 bfd_boolean translated;
5074 reloc_bfd_fix *next;
5078 static reloc_bfd_fix *
5079 reloc_bfd_fix_init (asection *src_sec,
5083 asection *target_sec,
5084 bfd_vma target_offset,
5085 bfd_boolean translated)
5089 fix = (reloc_bfd_fix *) bfd_malloc (sizeof (reloc_bfd_fix));
5090 fix->src_sec = src_sec;
5091 fix->src_offset = src_offset;
5092 fix->src_type = src_type;
5093 fix->target_abfd = target_abfd;
5094 fix->target_sec = target_sec;
5095 fix->target_offset = target_offset;
5096 fix->translated = translated;
5103 add_fix (asection *src_sec, reloc_bfd_fix *fix)
5105 xtensa_relax_info *relax_info;
5107 relax_info = get_xtensa_relax_info (src_sec);
5108 fix->next = relax_info->fix_list;
5109 relax_info->fix_list = fix;
5114 fix_compare (const void *ap, const void *bp)
5116 const reloc_bfd_fix *a = (const reloc_bfd_fix *) ap;
5117 const reloc_bfd_fix *b = (const reloc_bfd_fix *) bp;
5119 if (a->src_offset != b->src_offset)
5120 return (a->src_offset - b->src_offset);
5121 return (a->src_type - b->src_type);
5126 cache_fix_array (asection *sec)
5128 unsigned i, count = 0;
5130 xtensa_relax_info *relax_info = get_xtensa_relax_info (sec);
5132 if (relax_info == NULL)
5134 if (relax_info->fix_list == NULL)
5137 for (r = relax_info->fix_list; r != NULL; r = r->next)
5140 relax_info->fix_array =
5141 (reloc_bfd_fix *) bfd_malloc (sizeof (reloc_bfd_fix) * count);
5142 relax_info->fix_array_count = count;
5144 r = relax_info->fix_list;
5145 for (i = 0; i < count; i++, r = r->next)
5147 relax_info->fix_array[count - 1 - i] = *r;
5148 relax_info->fix_array[count - 1 - i].next = NULL;
5151 qsort (relax_info->fix_array, relax_info->fix_array_count,
5152 sizeof (reloc_bfd_fix), fix_compare);
5156 static reloc_bfd_fix *
5157 get_bfd_fix (asection *sec, bfd_vma offset, unsigned type)
5159 xtensa_relax_info *relax_info = get_xtensa_relax_info (sec);
5163 if (relax_info == NULL)
5165 if (relax_info->fix_list == NULL)
5168 if (relax_info->fix_array == NULL)
5169 cache_fix_array (sec);
5171 key.src_offset = offset;
5172 key.src_type = type;
5173 rv = bsearch (&key, relax_info->fix_array, relax_info->fix_array_count,
5174 sizeof (reloc_bfd_fix), fix_compare);
5179 /* Section caching. */
5181 typedef struct section_cache_struct section_cache_t;
5183 struct section_cache_struct
5187 bfd_byte *contents; /* Cache of the section contents. */
5188 bfd_size_type content_length;
5190 property_table_entry *ptbl; /* Cache of the section property table. */
5193 Elf_Internal_Rela *relocs; /* Cache of the section relocations. */
5194 unsigned reloc_count;
5199 init_section_cache (section_cache_t *sec_cache)
5201 memset (sec_cache, 0, sizeof (*sec_cache));
5206 clear_section_cache (section_cache_t *sec_cache)
5210 release_contents (sec_cache->sec, sec_cache->contents);
5211 release_internal_relocs (sec_cache->sec, sec_cache->relocs);
5212 if (sec_cache->ptbl)
5213 free (sec_cache->ptbl);
5214 memset (sec_cache, 0, sizeof (sec_cache));
5220 section_cache_section (section_cache_t *sec_cache,
5222 struct bfd_link_info *link_info)
5225 property_table_entry *prop_table = NULL;
5227 bfd_byte *contents = NULL;
5228 Elf_Internal_Rela *internal_relocs = NULL;
5229 bfd_size_type sec_size;
5233 if (sec == sec_cache->sec)
5237 sec_size = bfd_get_section_limit (abfd, sec);
5239 /* Get the contents. */
5240 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
5241 if (contents == NULL && sec_size != 0)
5244 /* Get the relocations. */
5245 internal_relocs = retrieve_internal_relocs (abfd, sec,
5246 link_info->keep_memory);
5248 /* Get the entry table. */
5249 ptblsize = xtensa_read_table_entries (abfd, sec, &prop_table,
5250 XTENSA_PROP_SEC_NAME, FALSE);
5254 /* Fill in the new section cache. */
5255 clear_section_cache (sec_cache);
5256 memset (sec_cache, 0, sizeof (sec_cache));
5258 sec_cache->sec = sec;
5259 sec_cache->contents = contents;
5260 sec_cache->content_length = sec_size;
5261 sec_cache->relocs = internal_relocs;
5262 sec_cache->reloc_count = sec->reloc_count;
5263 sec_cache->pte_count = ptblsize;
5264 sec_cache->ptbl = prop_table;
5269 release_contents (sec, contents);
5270 release_internal_relocs (sec, internal_relocs);
5277 /* Extended basic blocks. */
5279 /* An ebb_struct represents an Extended Basic Block. Within this
5280 range, we guarantee that all instructions are decodable, the
5281 property table entries are contiguous, and no property table
5282 specifies a segment that cannot have instructions moved. This
5283 structure contains caches of the contents, property table and
5284 relocations for the specified section for easy use. The range is
5285 specified by ranges of indices for the byte offset, property table
5286 offsets and relocation offsets. These must be consistent. */
5288 typedef struct ebb_struct ebb_t;
5294 bfd_byte *contents; /* Cache of the section contents. */
5295 bfd_size_type content_length;
5297 property_table_entry *ptbl; /* Cache of the section property table. */
5300 Elf_Internal_Rela *relocs; /* Cache of the section relocations. */
5301 unsigned reloc_count;
5303 bfd_vma start_offset; /* Offset in section. */
5304 unsigned start_ptbl_idx; /* Offset in the property table. */
5305 unsigned start_reloc_idx; /* Offset in the relocations. */
5308 unsigned end_ptbl_idx;
5309 unsigned end_reloc_idx;
5311 bfd_boolean ends_section; /* Is this the last ebb in a section? */
5313 /* The unreachable property table at the end of this set of blocks;
5314 NULL if the end is not an unreachable block. */
5315 property_table_entry *ends_unreachable;
5319 enum ebb_target_enum
5322 EBB_DESIRE_TGT_ALIGN,
5323 EBB_REQUIRE_TGT_ALIGN,
5324 EBB_REQUIRE_LOOP_ALIGN,
5329 /* proposed_action_struct is similar to the text_action_struct except
5330 that is represents a potential transformation, not one that will
5331 occur. We build a list of these for an extended basic block
5332 and use them to compute the actual actions desired. We must be
5333 careful that the entire set of actual actions we perform do not
5334 break any relocations that would fit if the actions were not
5337 typedef struct proposed_action_struct proposed_action;
5339 struct proposed_action_struct
5341 enum ebb_target_enum align_type; /* for the target alignment */
5342 bfd_vma alignment_pow;
5343 text_action_t action;
5346 bfd_boolean do_action; /* If false, then we will not perform the action. */
5350 /* The ebb_constraint_struct keeps a set of proposed actions for an
5351 extended basic block. */
5353 typedef struct ebb_constraint_struct ebb_constraint;
5355 struct ebb_constraint_struct
5358 bfd_boolean start_movable;
5360 /* Bytes of extra space at the beginning if movable. */
5361 int start_extra_space;
5363 enum ebb_target_enum start_align;
5365 bfd_boolean end_movable;
5367 /* Bytes of extra space at the end if movable. */
5368 int end_extra_space;
5370 unsigned action_count;
5371 unsigned action_allocated;
5373 /* Array of proposed actions. */
5374 proposed_action *actions;
5376 /* Action alignments -- one for each proposed action. */
5377 enum ebb_target_enum *action_aligns;
5382 init_ebb_constraint (ebb_constraint *c)
5384 memset (c, 0, sizeof (ebb_constraint));
5389 free_ebb_constraint (ebb_constraint *c)
5397 init_ebb (ebb_t *ebb,
5400 bfd_size_type content_length,
5401 property_table_entry *prop_table,
5403 Elf_Internal_Rela *internal_relocs,
5404 unsigned reloc_count)
5406 memset (ebb, 0, sizeof (ebb_t));
5408 ebb->contents = contents;
5409 ebb->content_length = content_length;
5410 ebb->ptbl = prop_table;
5411 ebb->pte_count = ptblsize;
5412 ebb->relocs = internal_relocs;
5413 ebb->reloc_count = reloc_count;
5414 ebb->start_offset = 0;
5415 ebb->end_offset = ebb->content_length - 1;
5416 ebb->start_ptbl_idx = 0;
5417 ebb->end_ptbl_idx = ptblsize;
5418 ebb->start_reloc_idx = 0;
5419 ebb->end_reloc_idx = reloc_count;
5423 /* Extend the ebb to all decodable contiguous sections. The algorithm
5424 for building a basic block around an instruction is to push it
5425 forward until we hit the end of a section, an unreachable block or
5426 a block that cannot be transformed. Then we push it backwards
5427 searching for similar conditions. */
5429 static bfd_boolean extend_ebb_bounds_forward (ebb_t *);
5430 static bfd_boolean extend_ebb_bounds_backward (ebb_t *);
5431 static bfd_size_type insn_block_decodable_len
5432 (bfd_byte *, bfd_size_type, bfd_vma, bfd_size_type);
5435 extend_ebb_bounds (ebb_t *ebb)
5437 if (!extend_ebb_bounds_forward (ebb))
5439 if (!extend_ebb_bounds_backward (ebb))
5446 extend_ebb_bounds_forward (ebb_t *ebb)
5448 property_table_entry *the_entry, *new_entry;
5450 the_entry = &ebb->ptbl[ebb->end_ptbl_idx];
5452 /* Stop when (1) we cannot decode an instruction, (2) we are at
5453 the end of the property tables, (3) we hit a non-contiguous property
5454 table entry, (4) we hit a NO_TRANSFORM region. */
5459 bfd_size_type insn_block_len;
5461 entry_end = the_entry->address - ebb->sec->vma + the_entry->size;
5463 insn_block_decodable_len (ebb->contents, ebb->content_length,
5465 entry_end - ebb->end_offset);
5466 if (insn_block_len != (entry_end - ebb->end_offset))
5468 (*_bfd_error_handler)
5469 (_("%B(%A+0x%lx): could not decode instruction; possible configuration mismatch"),
5470 ebb->sec->owner, ebb->sec, ebb->end_offset + insn_block_len);
5473 ebb->end_offset += insn_block_len;
5475 if (ebb->end_offset == ebb->sec->size)
5476 ebb->ends_section = TRUE;
5478 /* Update the reloc counter. */
5479 while (ebb->end_reloc_idx + 1 < ebb->reloc_count
5480 && (ebb->relocs[ebb->end_reloc_idx + 1].r_offset
5483 ebb->end_reloc_idx++;
5486 if (ebb->end_ptbl_idx + 1 == ebb->pte_count)
5489 new_entry = &ebb->ptbl[ebb->end_ptbl_idx + 1];
5490 if (((new_entry->flags & XTENSA_PROP_INSN) == 0)
5491 || ((new_entry->flags & XTENSA_PROP_INSN_NO_TRANSFORM) != 0)
5492 || ((the_entry->flags & XTENSA_PROP_ALIGN) != 0))
5495 if (the_entry->address + the_entry->size != new_entry->address)
5498 the_entry = new_entry;
5499 ebb->end_ptbl_idx++;
5502 /* Quick check for an unreachable or end of file just at the end. */
5503 if (ebb->end_ptbl_idx + 1 == ebb->pte_count)
5505 if (ebb->end_offset == ebb->content_length)
5506 ebb->ends_section = TRUE;
5510 new_entry = &ebb->ptbl[ebb->end_ptbl_idx + 1];
5511 if ((new_entry->flags & XTENSA_PROP_UNREACHABLE) != 0
5512 && the_entry->address + the_entry->size == new_entry->address)
5513 ebb->ends_unreachable = new_entry;
5516 /* Any other ending requires exact alignment. */
5522 extend_ebb_bounds_backward (ebb_t *ebb)
5524 property_table_entry *the_entry, *new_entry;
5526 the_entry = &ebb->ptbl[ebb->start_ptbl_idx];
5528 /* Stop when (1) we cannot decode the instructions in the current entry.
5529 (2) we are at the beginning of the property tables, (3) we hit a
5530 non-contiguous property table entry, (4) we hit a NO_TRANSFORM region. */
5534 bfd_vma block_begin;
5535 bfd_size_type insn_block_len;
5537 block_begin = the_entry->address - ebb->sec->vma;
5539 insn_block_decodable_len (ebb->contents, ebb->content_length,
5541 ebb->start_offset - block_begin);
5542 if (insn_block_len != ebb->start_offset - block_begin)
5544 (*_bfd_error_handler)
5545 (_("%B(%A+0x%lx): could not decode instruction; possible configuration mismatch"),
5546 ebb->sec->owner, ebb->sec, ebb->end_offset + insn_block_len);
5549 ebb->start_offset -= insn_block_len;
5551 /* Update the reloc counter. */
5552 while (ebb->start_reloc_idx > 0
5553 && (ebb->relocs[ebb->start_reloc_idx - 1].r_offset
5554 >= ebb->start_offset))
5556 ebb->start_reloc_idx--;
5559 if (ebb->start_ptbl_idx == 0)
5562 new_entry = &ebb->ptbl[ebb->start_ptbl_idx - 1];
5563 if ((new_entry->flags & XTENSA_PROP_INSN) == 0
5564 || ((new_entry->flags & XTENSA_PROP_INSN_NO_TRANSFORM) != 0)
5565 || ((new_entry->flags & XTENSA_PROP_ALIGN) != 0))
5567 if (new_entry->address + new_entry->size != the_entry->address)
5570 the_entry = new_entry;
5571 ebb->start_ptbl_idx--;
5577 static bfd_size_type
5578 insn_block_decodable_len (bfd_byte *contents,
5579 bfd_size_type content_len,
5580 bfd_vma block_offset,
5581 bfd_size_type block_len)
5583 bfd_vma offset = block_offset;
5585 while (offset < block_offset + block_len)
5587 bfd_size_type insn_len = 0;
5589 insn_len = insn_decode_len (contents, content_len, offset);
5591 return (offset - block_offset);
5594 return (offset - block_offset);
5598 static void ebb_add_proposed_action (ebb_constraint *, proposed_action *);
5601 ebb_propose_action (ebb_constraint *c,
5602 bfd_vma alignment_pow,
5603 enum ebb_target_enum align_type,
5604 text_action_t action,
5607 bfd_boolean do_action)
5609 proposed_action paction;
5610 paction.align_type = align_type;
5611 paction.alignment_pow = alignment_pow;
5612 paction.action = action;
5613 paction.offset = offset;
5614 paction.removed_bytes = removed_bytes;
5615 paction.do_action = do_action;
5616 ebb_add_proposed_action (c, &paction);
5621 ebb_add_proposed_action (ebb_constraint *c, proposed_action *action)
5624 if (c->action_allocated <= c->action_count)
5626 unsigned new_allocated = (c->action_count + 2) * 2;
5627 proposed_action *new_actions = (proposed_action *)
5628 bfd_zmalloc (sizeof (proposed_action) * new_allocated);
5630 for (i = 0; i < c->action_count; i++)
5631 new_actions[i] = c->actions[i];
5634 c->actions = new_actions;
5635 c->action_allocated = new_allocated;
5637 c->actions[c->action_count] = *action;
5642 /* Access to internal relocations, section contents and symbols. */
5644 /* During relaxation, we need to modify relocations, section contents,
5645 and symbol definitions, and we need to keep the original values from
5646 being reloaded from the input files, i.e., we need to "pin" the
5647 modified values in memory. We also want to continue to observe the
5648 setting of the "keep-memory" flag. The following functions wrap the
5649 standard BFD functions to take care of this for us. */
5651 static Elf_Internal_Rela *
5652 retrieve_internal_relocs (bfd *abfd, asection *sec, bfd_boolean keep_memory)
5654 Elf_Internal_Rela *internal_relocs;
5656 if ((sec->flags & SEC_LINKER_CREATED) != 0)
5659 internal_relocs = elf_section_data (sec)->relocs;
5660 if (internal_relocs == NULL)
5661 internal_relocs = (_bfd_elf_link_read_relocs
5662 (abfd, sec, NULL, NULL, keep_memory));
5663 return internal_relocs;
5668 pin_internal_relocs (asection *sec, Elf_Internal_Rela *internal_relocs)
5670 elf_section_data (sec)->relocs = internal_relocs;
5675 release_internal_relocs (asection *sec, Elf_Internal_Rela *internal_relocs)
5678 && elf_section_data (sec)->relocs != internal_relocs)
5679 free (internal_relocs);
5684 retrieve_contents (bfd *abfd, asection *sec, bfd_boolean keep_memory)
5687 bfd_size_type sec_size;
5689 sec_size = bfd_get_section_limit (abfd, sec);
5690 contents = elf_section_data (sec)->this_hdr.contents;
5692 if (contents == NULL && sec_size != 0)
5694 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
5701 elf_section_data (sec)->this_hdr.contents = contents;
5708 pin_contents (asection *sec, bfd_byte *contents)
5710 elf_section_data (sec)->this_hdr.contents = contents;
5715 release_contents (asection *sec, bfd_byte *contents)
5717 if (contents && elf_section_data (sec)->this_hdr.contents != contents)
5722 static Elf_Internal_Sym *
5723 retrieve_local_syms (bfd *input_bfd)
5725 Elf_Internal_Shdr *symtab_hdr;
5726 Elf_Internal_Sym *isymbuf;
5729 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
5730 locsymcount = symtab_hdr->sh_info;
5732 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
5733 if (isymbuf == NULL && locsymcount != 0)
5734 isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, locsymcount, 0,
5737 /* Save the symbols for this input file so they won't be read again. */
5738 if (isymbuf && isymbuf != (Elf_Internal_Sym *) symtab_hdr->contents)
5739 symtab_hdr->contents = (unsigned char *) isymbuf;
5745 /* Code for link-time relaxation. */
5747 /* Initialization for relaxation: */
5748 static bfd_boolean analyze_relocations (struct bfd_link_info *);
5749 static bfd_boolean find_relaxable_sections
5750 (bfd *, asection *, struct bfd_link_info *, bfd_boolean *);
5751 static bfd_boolean collect_source_relocs
5752 (bfd *, asection *, struct bfd_link_info *);
5753 static bfd_boolean is_resolvable_asm_expansion
5754 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, struct bfd_link_info *,
5756 static Elf_Internal_Rela *find_associated_l32r_irel
5757 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, Elf_Internal_Rela *);
5758 static bfd_boolean compute_text_actions
5759 (bfd *, asection *, struct bfd_link_info *);
5760 static bfd_boolean compute_ebb_proposed_actions (ebb_constraint *);
5761 static bfd_boolean compute_ebb_actions (ebb_constraint *);
5762 static bfd_boolean check_section_ebb_pcrels_fit
5763 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, const ebb_constraint *);
5764 static bfd_boolean check_section_ebb_reduces (const ebb_constraint *);
5765 static void text_action_add_proposed
5766 (text_action_list *, const ebb_constraint *, asection *);
5767 static int compute_fill_extra_space (property_table_entry *);
5770 static bfd_boolean compute_removed_literals
5771 (bfd *, asection *, struct bfd_link_info *, value_map_hash_table *);
5772 static Elf_Internal_Rela *get_irel_at_offset
5773 (asection *, Elf_Internal_Rela *, bfd_vma);
5774 static bfd_boolean is_removable_literal
5775 (const source_reloc *, int, const source_reloc *, int);
5776 static bfd_boolean remove_dead_literal
5777 (bfd *, asection *, struct bfd_link_info *, Elf_Internal_Rela *,
5778 Elf_Internal_Rela *, source_reloc *, property_table_entry *, int);
5779 static bfd_boolean identify_literal_placement
5780 (bfd *, asection *, bfd_byte *, struct bfd_link_info *,
5781 value_map_hash_table *, bfd_boolean *, Elf_Internal_Rela *, int,
5782 source_reloc *, property_table_entry *, int, section_cache_t *,
5784 static bfd_boolean relocations_reach (source_reloc *, int, const r_reloc *);
5785 static bfd_boolean coalesce_shared_literal
5786 (asection *, source_reloc *, property_table_entry *, int, value_map *);
5787 static bfd_boolean move_shared_literal
5788 (asection *, struct bfd_link_info *, source_reloc *, property_table_entry *,
5789 int, const r_reloc *, const literal_value *, section_cache_t *);
5792 static bfd_boolean relax_section (bfd *, asection *, struct bfd_link_info *);
5793 static bfd_boolean translate_section_fixes (asection *);
5794 static bfd_boolean translate_reloc_bfd_fix (reloc_bfd_fix *);
5795 static void translate_reloc (const r_reloc *, r_reloc *);
5796 static void shrink_dynamic_reloc_sections
5797 (struct bfd_link_info *, bfd *, asection *, Elf_Internal_Rela *);
5798 static bfd_boolean move_literal
5799 (bfd *, struct bfd_link_info *, asection *, bfd_vma, bfd_byte *,
5800 xtensa_relax_info *, Elf_Internal_Rela **, const literal_value *);
5801 static bfd_boolean relax_property_section
5802 (bfd *, asection *, struct bfd_link_info *);
5805 static bfd_boolean relax_section_symbols (bfd *, asection *);
5809 elf_xtensa_relax_section (bfd *abfd,
5811 struct bfd_link_info *link_info,
5814 static value_map_hash_table *values = NULL;
5815 static bfd_boolean relocations_analyzed = FALSE;
5816 xtensa_relax_info *relax_info;
5818 if (!relocations_analyzed)
5820 /* Do some overall initialization for relaxation. */
5821 values = value_map_hash_table_init ();
5824 relaxing_section = TRUE;
5825 if (!analyze_relocations (link_info))
5827 relocations_analyzed = TRUE;
5831 /* Don't mess with linker-created sections. */
5832 if ((sec->flags & SEC_LINKER_CREATED) != 0)
5835 relax_info = get_xtensa_relax_info (sec);
5836 BFD_ASSERT (relax_info != NULL);
5838 switch (relax_info->visited)
5841 /* Note: It would be nice to fold this pass into
5842 analyze_relocations, but it is important for this step that the
5843 sections be examined in link order. */
5844 if (!compute_removed_literals (abfd, sec, link_info, values))
5851 value_map_hash_table_delete (values);
5853 if (!relax_section (abfd, sec, link_info))
5859 if (!relax_section_symbols (abfd, sec))
5864 relax_info->visited++;
5869 /* Initialization for relaxation. */
5871 /* This function is called once at the start of relaxation. It scans
5872 all the input sections and marks the ones that are relaxable (i.e.,
5873 literal sections with L32R relocations against them), and then
5874 collects source_reloc information for all the relocations against
5875 those relaxable sections. During this process, it also detects
5876 longcalls, i.e., calls relaxed by the assembler into indirect
5877 calls, that can be optimized back into direct calls. Within each
5878 extended basic block (ebb) containing an optimized longcall, it
5879 computes a set of "text actions" that can be performed to remove
5880 the L32R associated with the longcall while optionally preserving
5881 branch target alignments. */
5884 analyze_relocations (struct bfd_link_info *link_info)
5888 bfd_boolean is_relaxable = FALSE;
5890 /* Initialize the per-section relaxation info. */
5891 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next)
5892 for (sec = abfd->sections; sec != NULL; sec = sec->next)
5894 init_xtensa_relax_info (sec);
5897 /* Mark relaxable sections (and count relocations against each one). */
5898 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next)
5899 for (sec = abfd->sections; sec != NULL; sec = sec->next)
5901 if (!find_relaxable_sections (abfd, sec, link_info, &is_relaxable))
5905 /* Bail out if there are no relaxable sections. */
5909 /* Allocate space for source_relocs. */
5910 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next)
5911 for (sec = abfd->sections; sec != NULL; sec = sec->next)
5913 xtensa_relax_info *relax_info;
5915 relax_info = get_xtensa_relax_info (sec);
5916 if (relax_info->is_relaxable_literal_section
5917 || relax_info->is_relaxable_asm_section)
5919 relax_info->src_relocs = (source_reloc *)
5920 bfd_malloc (relax_info->src_count * sizeof (source_reloc));
5924 /* Collect info on relocations against each relaxable section. */
5925 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next)
5926 for (sec = abfd->sections; sec != NULL; sec = sec->next)
5928 if (!collect_source_relocs (abfd, sec, link_info))
5932 /* Compute the text actions. */
5933 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next)
5934 for (sec = abfd->sections; sec != NULL; sec = sec->next)
5936 if (!compute_text_actions (abfd, sec, link_info))
5944 /* Find all the sections that might be relaxed. The motivation for
5945 this pass is that collect_source_relocs() needs to record _all_ the
5946 relocations that target each relaxable section. That is expensive
5947 and unnecessary unless the target section is actually going to be
5948 relaxed. This pass identifies all such sections by checking if
5949 they have L32Rs pointing to them. In the process, the total number
5950 of relocations targeting each section is also counted so that we
5951 know how much space to allocate for source_relocs against each
5952 relaxable literal section. */
5955 find_relaxable_sections (bfd *abfd,
5957 struct bfd_link_info *link_info,
5958 bfd_boolean *is_relaxable_p)
5960 Elf_Internal_Rela *internal_relocs;
5962 bfd_boolean ok = TRUE;
5964 xtensa_relax_info *source_relax_info;
5966 internal_relocs = retrieve_internal_relocs (abfd, sec,
5967 link_info->keep_memory);
5968 if (internal_relocs == NULL)
5971 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
5972 if (contents == NULL && sec->size != 0)
5978 source_relax_info = get_xtensa_relax_info (sec);
5979 for (i = 0; i < sec->reloc_count; i++)
5981 Elf_Internal_Rela *irel = &internal_relocs[i];
5983 asection *target_sec;
5984 xtensa_relax_info *target_relax_info;
5986 /* If this section has not already been marked as "relaxable", and
5987 if it contains any ASM_EXPAND relocations (marking expanded
5988 longcalls) that can be optimized into direct calls, then mark
5989 the section as "relaxable". */
5990 if (source_relax_info
5991 && !source_relax_info->is_relaxable_asm_section
5992 && ELF32_R_TYPE (irel->r_info) == R_XTENSA_ASM_EXPAND)
5994 bfd_boolean is_reachable = FALSE;
5995 if (is_resolvable_asm_expansion (abfd, sec, contents, irel,
5996 link_info, &is_reachable)
5999 source_relax_info->is_relaxable_asm_section = TRUE;
6000 *is_relaxable_p = TRUE;
6004 r_reloc_init (&r_rel, abfd, irel, contents,
6005 bfd_get_section_limit (abfd, sec));
6007 target_sec = r_reloc_get_section (&r_rel);
6008 target_relax_info = get_xtensa_relax_info (target_sec);
6009 if (!target_relax_info)
6012 /* Count PC-relative operand relocations against the target section.
6013 Note: The conditions tested here must match the conditions under
6014 which init_source_reloc is called in collect_source_relocs(). */
6015 if (is_operand_relocation (ELF32_R_TYPE (irel->r_info))
6016 && (!is_alt_relocation (ELF32_R_TYPE (irel->r_info))
6017 || is_l32r_relocation (abfd, sec, contents, irel)))
6018 target_relax_info->src_count++;
6020 if (is_l32r_relocation (abfd, sec, contents, irel)
6021 && r_reloc_is_defined (&r_rel))
6023 /* Mark the target section as relaxable. */
6024 target_relax_info->is_relaxable_literal_section = TRUE;
6025 *is_relaxable_p = TRUE;
6030 release_contents (sec, contents);
6031 release_internal_relocs (sec, internal_relocs);
6036 /* Record _all_ the relocations that point to relaxable sections, and
6037 get rid of ASM_EXPAND relocs by either converting them to
6038 ASM_SIMPLIFY or by removing them. */
6041 collect_source_relocs (bfd *abfd,
6043 struct bfd_link_info *link_info)
6045 Elf_Internal_Rela *internal_relocs;
6047 bfd_boolean ok = TRUE;
6049 bfd_size_type sec_size;
6051 internal_relocs = retrieve_internal_relocs (abfd, sec,
6052 link_info->keep_memory);
6053 if (internal_relocs == NULL)
6056 sec_size = bfd_get_section_limit (abfd, sec);
6057 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
6058 if (contents == NULL && sec_size != 0)
6064 /* Record relocations against relaxable literal sections. */
6065 for (i = 0; i < sec->reloc_count; i++)
6067 Elf_Internal_Rela *irel = &internal_relocs[i];
6069 asection *target_sec;
6070 xtensa_relax_info *target_relax_info;
6072 r_reloc_init (&r_rel, abfd, irel, contents, sec_size);
6074 target_sec = r_reloc_get_section (&r_rel);
6075 target_relax_info = get_xtensa_relax_info (target_sec);
6077 if (target_relax_info
6078 && (target_relax_info->is_relaxable_literal_section
6079 || target_relax_info->is_relaxable_asm_section))
6081 xtensa_opcode opcode = XTENSA_UNDEFINED;
6083 bfd_boolean is_abs_literal = FALSE;
6085 if (is_alt_relocation (ELF32_R_TYPE (irel->r_info)))
6087 /* None of the current alternate relocs are PC-relative,
6088 and only PC-relative relocs matter here. However, we
6089 still need to record the opcode for literal
6091 opcode = get_relocation_opcode (abfd, sec, contents, irel);
6092 if (opcode == get_l32r_opcode ())
6094 is_abs_literal = TRUE;
6098 opcode = XTENSA_UNDEFINED;
6100 else if (is_operand_relocation (ELF32_R_TYPE (irel->r_info)))
6102 opcode = get_relocation_opcode (abfd, sec, contents, irel);
6103 opnd = get_relocation_opnd (opcode, ELF32_R_TYPE (irel->r_info));
6106 if (opcode != XTENSA_UNDEFINED)
6108 int src_next = target_relax_info->src_next++;
6109 source_reloc *s_reloc = &target_relax_info->src_relocs[src_next];
6111 init_source_reloc (s_reloc, sec, &r_rel, opcode, opnd,
6117 /* Now get rid of ASM_EXPAND relocations. At this point, the
6118 src_relocs array for the target literal section may still be
6119 incomplete, but it must at least contain the entries for the L32R
6120 relocations associated with ASM_EXPANDs because they were just
6121 added in the preceding loop over the relocations. */
6123 for (i = 0; i < sec->reloc_count; i++)
6125 Elf_Internal_Rela *irel = &internal_relocs[i];
6126 bfd_boolean is_reachable;
6128 if (!is_resolvable_asm_expansion (abfd, sec, contents, irel, link_info,
6134 Elf_Internal_Rela *l32r_irel;
6136 asection *target_sec;
6137 xtensa_relax_info *target_relax_info;
6139 /* Mark the source_reloc for the L32R so that it will be
6140 removed in compute_removed_literals(), along with the
6141 associated literal. */
6142 l32r_irel = find_associated_l32r_irel (abfd, sec, contents,
6143 irel, internal_relocs);
6144 if (l32r_irel == NULL)
6147 r_reloc_init (&r_rel, abfd, l32r_irel, contents, sec_size);
6149 target_sec = r_reloc_get_section (&r_rel);
6150 target_relax_info = get_xtensa_relax_info (target_sec);
6152 if (target_relax_info
6153 && (target_relax_info->is_relaxable_literal_section
6154 || target_relax_info->is_relaxable_asm_section))
6156 source_reloc *s_reloc;
6158 /* Search the source_relocs for the entry corresponding to
6159 the l32r_irel. Note: The src_relocs array is not yet
6160 sorted, but it wouldn't matter anyway because we're
6161 searching by source offset instead of target offset. */
6162 s_reloc = find_source_reloc (target_relax_info->src_relocs,
6163 target_relax_info->src_next,
6165 BFD_ASSERT (s_reloc);
6166 s_reloc->is_null = TRUE;
6169 /* Convert this reloc to ASM_SIMPLIFY. */
6170 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
6171 R_XTENSA_ASM_SIMPLIFY);
6172 l32r_irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
6174 pin_internal_relocs (sec, internal_relocs);
6178 /* It is resolvable but doesn't reach. We resolve now
6179 by eliminating the relocation -- the call will remain
6180 expanded into L32R/CALLX. */
6181 irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
6182 pin_internal_relocs (sec, internal_relocs);
6187 release_contents (sec, contents);
6188 release_internal_relocs (sec, internal_relocs);
6193 /* Return TRUE if the asm expansion can be resolved. Generally it can
6194 be resolved on a final link or when a partial link locates it in the
6195 same section as the target. Set "is_reachable" flag if the target of
6196 the call is within the range of a direct call, given the current VMA
6197 for this section and the target section. */
6200 is_resolvable_asm_expansion (bfd *abfd,
6203 Elf_Internal_Rela *irel,
6204 struct bfd_link_info *link_info,
6205 bfd_boolean *is_reachable_p)
6207 asection *target_sec;
6208 bfd_vma target_offset;
6210 xtensa_opcode opcode, direct_call_opcode;
6211 bfd_vma self_address;
6212 bfd_vma dest_address;
6213 bfd_boolean uses_l32r;
6214 bfd_size_type sec_size;
6216 *is_reachable_p = FALSE;
6218 if (contents == NULL)
6221 if (ELF32_R_TYPE (irel->r_info) != R_XTENSA_ASM_EXPAND)
6224 sec_size = bfd_get_section_limit (abfd, sec);
6225 opcode = get_expanded_call_opcode (contents + irel->r_offset,
6226 sec_size - irel->r_offset, &uses_l32r);
6227 /* Optimization of longcalls that use CONST16 is not yet implemented. */
6231 direct_call_opcode = swap_callx_for_call_opcode (opcode);
6232 if (direct_call_opcode == XTENSA_UNDEFINED)
6235 /* Check and see that the target resolves. */
6236 r_reloc_init (&r_rel, abfd, irel, contents, sec_size);
6237 if (!r_reloc_is_defined (&r_rel))
6240 target_sec = r_reloc_get_section (&r_rel);
6241 target_offset = r_rel.target_offset;
6243 /* If the target is in a shared library, then it doesn't reach. This
6244 isn't supposed to come up because the compiler should never generate
6245 non-PIC calls on systems that use shared libraries, but the linker
6246 shouldn't crash regardless. */
6247 if (!target_sec->output_section)
6250 /* For relocatable sections, we can only simplify when the output
6251 section of the target is the same as the output section of the
6253 if (link_info->relocatable
6254 && (target_sec->output_section != sec->output_section
6255 || is_reloc_sym_weak (abfd, irel)))
6258 self_address = (sec->output_section->vma
6259 + sec->output_offset + irel->r_offset + 3);
6260 dest_address = (target_sec->output_section->vma
6261 + target_sec->output_offset + target_offset);
6263 *is_reachable_p = pcrel_reloc_fits (direct_call_opcode, 0,
6264 self_address, dest_address);
6266 if ((self_address >> CALL_SEGMENT_BITS) !=
6267 (dest_address >> CALL_SEGMENT_BITS))
6274 static Elf_Internal_Rela *
6275 find_associated_l32r_irel (bfd *abfd,
6278 Elf_Internal_Rela *other_irel,
6279 Elf_Internal_Rela *internal_relocs)
6283 for (i = 0; i < sec->reloc_count; i++)
6285 Elf_Internal_Rela *irel = &internal_relocs[i];
6287 if (irel == other_irel)
6289 if (irel->r_offset != other_irel->r_offset)
6291 if (is_l32r_relocation (abfd, sec, contents, irel))
6299 /* The compute_text_actions function will build a list of potential
6300 transformation actions for code in the extended basic block of each
6301 longcall that is optimized to a direct call. From this list we
6302 generate a set of actions to actually perform that optimizes for
6303 space and, if not using size_opt, maintains branch target
6306 These actions to be performed are placed on a per-section list.
6307 The actual changes are performed by relax_section() in the second
6311 compute_text_actions (bfd *abfd,
6313 struct bfd_link_info *link_info)
6315 xtensa_relax_info *relax_info;
6317 Elf_Internal_Rela *internal_relocs;
6318 bfd_boolean ok = TRUE;
6320 property_table_entry *prop_table = 0;
6322 bfd_size_type sec_size;
6323 static bfd_boolean no_insn_move = FALSE;
6328 /* Do nothing if the section contains no optimized longcalls. */
6329 relax_info = get_xtensa_relax_info (sec);
6330 BFD_ASSERT (relax_info);
6331 if (!relax_info->is_relaxable_asm_section)
6334 internal_relocs = retrieve_internal_relocs (abfd, sec,
6335 link_info->keep_memory);
6337 if (internal_relocs)
6338 qsort (internal_relocs, sec->reloc_count, sizeof (Elf_Internal_Rela),
6339 internal_reloc_compare);
6341 sec_size = bfd_get_section_limit (abfd, sec);
6342 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
6343 if (contents == NULL && sec_size != 0)
6349 ptblsize = xtensa_read_table_entries (abfd, sec, &prop_table,
6350 XTENSA_PROP_SEC_NAME, FALSE);
6357 for (i = 0; i < sec->reloc_count; i++)
6359 Elf_Internal_Rela *irel = &internal_relocs[i];
6361 property_table_entry *the_entry;
6364 ebb_constraint ebb_table;
6365 bfd_size_type simplify_size;
6367 if (irel && ELF32_R_TYPE (irel->r_info) != R_XTENSA_ASM_SIMPLIFY)
6369 r_offset = irel->r_offset;
6371 simplify_size = get_asm_simplify_size (contents, sec_size, r_offset);
6372 if (simplify_size == 0)
6374 (*_bfd_error_handler)
6375 (_("%B(%A+0x%lx): could not decode instruction for XTENSA_ASM_SIMPLIFY relocation; possible configuration mismatch"),
6376 sec->owner, sec, r_offset);
6380 /* If the instruction table is not around, then don't do this
6382 the_entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
6383 sec->vma + irel->r_offset);
6384 if (the_entry == NULL || XTENSA_NO_NOP_REMOVAL)
6386 text_action_add (&relax_info->action_list,
6387 ta_convert_longcall, sec, r_offset,
6392 /* If the next longcall happens to be at the same address as an
6393 unreachable section of size 0, then skip forward. */
6394 ptbl_idx = the_entry - prop_table;
6395 while ((the_entry->flags & XTENSA_PROP_UNREACHABLE)
6396 && the_entry->size == 0
6397 && ptbl_idx + 1 < ptblsize
6398 && (prop_table[ptbl_idx + 1].address
6399 == prop_table[ptbl_idx].address))
6405 if (the_entry->flags & XTENSA_PROP_INSN_NO_TRANSFORM)
6406 /* NO_REORDER is OK */
6409 init_ebb_constraint (&ebb_table);
6410 ebb = &ebb_table.ebb;
6411 init_ebb (ebb, sec, contents, sec_size, prop_table, ptblsize,
6412 internal_relocs, sec->reloc_count);
6413 ebb->start_offset = r_offset + simplify_size;
6414 ebb->end_offset = r_offset + simplify_size;
6415 ebb->start_ptbl_idx = ptbl_idx;
6416 ebb->end_ptbl_idx = ptbl_idx;
6417 ebb->start_reloc_idx = i;
6418 ebb->end_reloc_idx = i;
6420 if (!extend_ebb_bounds (ebb)
6421 || !compute_ebb_proposed_actions (&ebb_table)
6422 || !compute_ebb_actions (&ebb_table)
6423 || !check_section_ebb_pcrels_fit (abfd, sec, contents,
6424 internal_relocs, &ebb_table)
6425 || !check_section_ebb_reduces (&ebb_table))
6427 /* If anything goes wrong or we get unlucky and something does
6428 not fit, with our plan because of expansion between
6429 critical branches, just convert to a NOP. */
6431 text_action_add (&relax_info->action_list,
6432 ta_convert_longcall, sec, r_offset, 0);
6433 i = ebb_table.ebb.end_reloc_idx;
6434 free_ebb_constraint (&ebb_table);
6438 text_action_add_proposed (&relax_info->action_list, &ebb_table, sec);
6440 /* Update the index so we do not go looking at the relocations
6441 we have already processed. */
6442 i = ebb_table.ebb.end_reloc_idx;
6443 free_ebb_constraint (&ebb_table);
6447 if (relax_info->action_list.head)
6448 print_action_list (stderr, &relax_info->action_list);
6452 release_contents (sec, contents);
6453 release_internal_relocs (sec, internal_relocs);
6461 /* Find all of the possible actions for an extended basic block. */
6464 compute_ebb_proposed_actions (ebb_constraint *ebb_table)
6466 const ebb_t *ebb = &ebb_table->ebb;
6467 unsigned rel_idx = ebb->start_reloc_idx;
6468 property_table_entry *entry, *start_entry, *end_entry;
6470 start_entry = &ebb->ptbl[ebb->start_ptbl_idx];
6471 end_entry = &ebb->ptbl[ebb->end_ptbl_idx];
6473 for (entry = start_entry; entry <= end_entry; entry++)
6475 bfd_vma offset, start_offset, end_offset;
6476 bfd_size_type insn_len;
6478 start_offset = entry->address - ebb->sec->vma;
6479 end_offset = entry->address + entry->size - ebb->sec->vma;
6481 if (entry == start_entry)
6482 start_offset = ebb->start_offset;
6483 if (entry == end_entry)
6484 end_offset = ebb->end_offset;
6485 offset = start_offset;
6487 if (offset == entry->address - ebb->sec->vma
6488 && (entry->flags & XTENSA_PROP_INSN_BRANCH_TARGET) != 0)
6490 enum ebb_target_enum align_type = EBB_DESIRE_TGT_ALIGN;
6491 BFD_ASSERT (offset != end_offset);
6492 if (offset == end_offset)
6495 insn_len = insn_decode_len (ebb->contents, ebb->content_length,
6498 /* Propose no actions for a section with an undecodable offset. */
6501 (*_bfd_error_handler)
6502 (_("%B(%A+0x%lx): could not decode instruction; possible configuration mismatch"),
6503 ebb->sec->owner, ebb->sec, offset);
6506 if (check_branch_target_aligned_address (offset, insn_len))
6507 align_type = EBB_REQUIRE_TGT_ALIGN;
6509 ebb_propose_action (ebb_table, align_type, 0,
6510 ta_none, offset, 0, TRUE);
6513 while (offset != end_offset)
6515 Elf_Internal_Rela *irel;
6516 xtensa_opcode opcode;
6518 while (rel_idx < ebb->end_reloc_idx
6519 && (ebb->relocs[rel_idx].r_offset < offset
6520 || (ebb->relocs[rel_idx].r_offset == offset
6521 && (ELF32_R_TYPE (ebb->relocs[rel_idx].r_info)
6522 != R_XTENSA_ASM_SIMPLIFY))))
6525 /* Check for longcall. */
6526 irel = &ebb->relocs[rel_idx];
6527 if (irel->r_offset == offset
6528 && ELF32_R_TYPE (irel->r_info) == R_XTENSA_ASM_SIMPLIFY)
6530 bfd_size_type simplify_size;
6532 simplify_size = get_asm_simplify_size (ebb->contents,
6533 ebb->content_length,
6535 if (simplify_size == 0)
6537 (*_bfd_error_handler)
6538 (_("%B(%A+0x%lx): could not decode instruction for XTENSA_ASM_SIMPLIFY relocation; possible configuration mismatch"),
6539 ebb->sec->owner, ebb->sec, offset);
6543 ebb_propose_action (ebb_table, EBB_NO_ALIGN, 0,
6544 ta_convert_longcall, offset, 0, TRUE);
6546 offset += simplify_size;
6550 insn_len = insn_decode_len (ebb->contents, ebb->content_length,
6552 /* If the instruction is undecodable, then report an error. */
6555 (*_bfd_error_handler)
6556 (_("%B(%A+0x%lx): could not decode instruction; possible configuration mismatch"),
6557 ebb->sec->owner, ebb->sec, offset);
6561 if ((entry->flags & XTENSA_PROP_INSN_NO_DENSITY) == 0
6562 && (entry->flags & XTENSA_PROP_INSN_NO_TRANSFORM) == 0
6563 && narrow_instruction (ebb->contents, ebb->content_length,
6566 /* Add an instruction narrow action. */
6567 ebb_propose_action (ebb_table, EBB_NO_ALIGN, 0,
6568 ta_narrow_insn, offset, 0, FALSE);
6572 if ((entry->flags & XTENSA_PROP_INSN_NO_TRANSFORM) == 0
6573 && widen_instruction (ebb->contents, ebb->content_length,
6576 /* Add an instruction widen action. */
6577 ebb_propose_action (ebb_table, EBB_NO_ALIGN, 0,
6578 ta_widen_insn, offset, 0, FALSE);
6582 opcode = insn_decode_opcode (ebb->contents, ebb->content_length,
6584 if (xtensa_opcode_is_loop (xtensa_default_isa, opcode))
6586 /* Check for branch targets. */
6587 ebb_propose_action (ebb_table, EBB_REQUIRE_LOOP_ALIGN, 0,
6588 ta_none, offset, 0, TRUE);
6597 if (ebb->ends_unreachable)
6599 ebb_propose_action (ebb_table, EBB_NO_ALIGN, 0,
6600 ta_fill, ebb->end_offset, 0, TRUE);
6607 /* After all of the information has collected about the
6608 transformations possible in an EBB, compute the appropriate actions
6609 here in compute_ebb_actions. We still must check later to make
6610 sure that the actions do not break any relocations. The algorithm
6611 used here is pretty greedy. Basically, it removes as many no-ops
6612 as possible so that the end of the EBB has the same alignment
6613 characteristics as the original. First, it uses narrowing, then
6614 fill space at the end of the EBB, and finally widenings. If that
6615 does not work, it tries again with one fewer no-op removed. The
6616 optimization will only be performed if all of the branch targets
6617 that were aligned before transformation are also aligned after the
6620 When the size_opt flag is set, ignore the branch target alignments,
6621 narrow all wide instructions, and remove all no-ops unless the end
6622 of the EBB prevents it. */
6625 compute_ebb_actions (ebb_constraint *ebb_table)
6629 int removed_bytes = 0;
6630 ebb_t *ebb = &ebb_table->ebb;
6631 unsigned seg_idx_start = 0;
6632 unsigned seg_idx_end = 0;
6634 /* We perform this like the assembler relaxation algorithm: Start by
6635 assuming all instructions are narrow and all no-ops removed; then
6638 /* For each segment of this that has a solid constraint, check to
6639 see if there are any combinations that will keep the constraint.
6641 for (seg_idx_end = 0; seg_idx_end < ebb_table->action_count; seg_idx_end++)
6643 bfd_boolean requires_text_end_align = FALSE;
6644 unsigned longcall_count = 0;
6645 unsigned longcall_convert_count = 0;
6646 unsigned narrowable_count = 0;
6647 unsigned narrowable_convert_count = 0;
6648 unsigned widenable_count = 0;
6649 unsigned widenable_convert_count = 0;
6651 proposed_action *action = NULL;
6652 int align = (1 << ebb_table->ebb.sec->alignment_power);
6654 seg_idx_start = seg_idx_end;
6656 for (i = seg_idx_start; i < ebb_table->action_count; i++)
6658 action = &ebb_table->actions[i];
6659 if (action->action == ta_convert_longcall)
6661 if (action->action == ta_narrow_insn)
6663 if (action->action == ta_widen_insn)
6665 if (action->action == ta_fill)
6667 if (action->align_type == EBB_REQUIRE_LOOP_ALIGN)
6669 if (action->align_type == EBB_REQUIRE_TGT_ALIGN
6670 && !elf32xtensa_size_opt)
6675 if (seg_idx_end == ebb_table->action_count && !ebb->ends_unreachable)
6676 requires_text_end_align = TRUE;
6678 if (elf32xtensa_size_opt && !requires_text_end_align
6679 && action->align_type != EBB_REQUIRE_LOOP_ALIGN
6680 && action->align_type != EBB_REQUIRE_TGT_ALIGN)
6682 longcall_convert_count = longcall_count;
6683 narrowable_convert_count = narrowable_count;
6684 widenable_convert_count = 0;
6688 /* There is a constraint. Convert the max number of longcalls. */
6689 narrowable_convert_count = 0;
6690 longcall_convert_count = 0;
6691 widenable_convert_count = 0;
6693 for (j = 0; j < longcall_count; j++)
6695 int removed = (longcall_count - j) * 3 & (align - 1);
6696 unsigned desire_narrow = (align - removed) & (align - 1);
6697 unsigned desire_widen = removed;
6698 if (desire_narrow <= narrowable_count)
6700 narrowable_convert_count = desire_narrow;
6701 narrowable_convert_count +=
6702 (align * ((narrowable_count - narrowable_convert_count)
6704 longcall_convert_count = (longcall_count - j);
6705 widenable_convert_count = 0;
6708 if (desire_widen <= widenable_count && !elf32xtensa_size_opt)
6710 narrowable_convert_count = 0;
6711 longcall_convert_count = longcall_count - j;
6712 widenable_convert_count = desire_widen;
6718 /* Now the number of conversions are saved. Do them. */
6719 for (i = seg_idx_start; i < seg_idx_end; i++)
6721 action = &ebb_table->actions[i];
6722 switch (action->action)
6724 case ta_convert_longcall:
6725 if (longcall_convert_count != 0)
6727 action->action = ta_remove_longcall;
6728 action->do_action = TRUE;
6729 action->removed_bytes += 3;
6730 longcall_convert_count--;
6733 case ta_narrow_insn:
6734 if (narrowable_convert_count != 0)
6736 action->do_action = TRUE;
6737 action->removed_bytes += 1;
6738 narrowable_convert_count--;
6742 if (widenable_convert_count != 0)
6744 action->do_action = TRUE;
6745 action->removed_bytes -= 1;
6746 widenable_convert_count--;
6755 /* Now we move on to some local opts. Try to remove each of the
6756 remaining longcalls. */
6758 if (ebb_table->ebb.ends_section || ebb_table->ebb.ends_unreachable)
6761 for (i = 0; i < ebb_table->action_count; i++)
6763 int old_removed_bytes = removed_bytes;
6764 proposed_action *action = &ebb_table->actions[i];
6766 if (action->do_action && action->action == ta_convert_longcall)
6768 bfd_boolean bad_alignment = FALSE;
6770 for (j = i + 1; j < ebb_table->action_count; j++)
6772 proposed_action *new_action = &ebb_table->actions[j];
6773 bfd_vma offset = new_action->offset;
6774 if (new_action->align_type == EBB_REQUIRE_TGT_ALIGN)
6776 if (!check_branch_target_aligned
6777 (ebb_table->ebb.contents,
6778 ebb_table->ebb.content_length,
6779 offset, offset - removed_bytes))
6781 bad_alignment = TRUE;
6785 if (new_action->align_type == EBB_REQUIRE_LOOP_ALIGN)
6787 if (!check_loop_aligned (ebb_table->ebb.contents,
6788 ebb_table->ebb.content_length,
6790 offset - removed_bytes))
6792 bad_alignment = TRUE;
6796 if (new_action->action == ta_narrow_insn
6797 && !new_action->do_action
6798 && ebb_table->ebb.sec->alignment_power == 2)
6800 /* Narrow an instruction and we are done. */
6801 new_action->do_action = TRUE;
6802 new_action->removed_bytes += 1;
6803 bad_alignment = FALSE;
6806 if (new_action->action == ta_widen_insn
6807 && new_action->do_action
6808 && ebb_table->ebb.sec->alignment_power == 2)
6810 /* Narrow an instruction and we are done. */
6811 new_action->do_action = FALSE;
6812 new_action->removed_bytes += 1;
6813 bad_alignment = FALSE;
6819 action->removed_bytes += 3;
6820 action->action = ta_remove_longcall;
6821 action->do_action = TRUE;
6824 removed_bytes = old_removed_bytes;
6825 if (action->do_action)
6826 removed_bytes += action->removed_bytes;
6831 for (i = 0; i < ebb_table->action_count; ++i)
6833 proposed_action *action = &ebb_table->actions[i];
6834 if (action->do_action)
6835 removed_bytes += action->removed_bytes;
6838 if ((removed_bytes % (1 << ebb_table->ebb.sec->alignment_power)) != 0
6839 && ebb->ends_unreachable)
6841 proposed_action *action;
6845 BFD_ASSERT (ebb_table->action_count != 0);
6846 action = &ebb_table->actions[ebb_table->action_count - 1];
6847 BFD_ASSERT (action->action == ta_fill);
6848 BFD_ASSERT (ebb->ends_unreachable->flags & XTENSA_PROP_UNREACHABLE);
6850 extra_space = compute_fill_extra_space (ebb->ends_unreachable);
6851 br = action->removed_bytes + removed_bytes + extra_space;
6852 br = br & ((1 << ebb->sec->alignment_power ) - 1);
6854 action->removed_bytes = extra_space - br;
6860 /* Use check_section_ebb_pcrels_fit to make sure that all of the
6861 relocations in a section will fit if a proposed set of actions
6865 check_section_ebb_pcrels_fit (bfd *abfd,
6868 Elf_Internal_Rela *internal_relocs,
6869 const ebb_constraint *constraint)
6872 Elf_Internal_Rela *irel;
6873 xtensa_relax_info *relax_info;
6875 relax_info = get_xtensa_relax_info (sec);
6877 for (i = 0; i < sec->reloc_count; i++)
6880 bfd_vma orig_self_offset, orig_target_offset;
6881 bfd_vma self_offset, target_offset;
6883 reloc_howto_type *howto;
6884 int self_removed_bytes, target_removed_bytes;
6886 irel = &internal_relocs[i];
6887 r_type = ELF32_R_TYPE (irel->r_info);
6889 howto = &elf_howto_table[r_type];
6890 /* We maintain the required invariant: PC-relative relocations
6891 that fit before linking must fit after linking. Thus we only
6892 need to deal with relocations to the same section that are
6894 if (ELF32_R_TYPE (irel->r_info) == R_XTENSA_ASM_SIMPLIFY
6895 || !howto->pc_relative)
6898 r_reloc_init (&r_rel, abfd, irel, contents,
6899 bfd_get_section_limit (abfd, sec));
6901 if (r_reloc_get_section (&r_rel) != sec)
6904 orig_self_offset = irel->r_offset;
6905 orig_target_offset = r_rel.target_offset;
6907 self_offset = orig_self_offset;
6908 target_offset = orig_target_offset;
6912 self_offset = offset_with_removed_text (&relax_info->action_list,
6914 target_offset = offset_with_removed_text (&relax_info->action_list,
6915 orig_target_offset);
6918 self_removed_bytes = 0;
6919 target_removed_bytes = 0;
6921 for (j = 0; j < constraint->action_count; ++j)
6923 proposed_action *action = &constraint->actions[j];
6924 bfd_vma offset = action->offset;
6925 int removed_bytes = action->removed_bytes;
6926 if (offset < orig_self_offset
6927 || (offset == orig_self_offset && action->action == ta_fill
6928 && action->removed_bytes < 0))
6929 self_removed_bytes += removed_bytes;
6930 if (offset < orig_target_offset
6931 || (offset == orig_target_offset && action->action == ta_fill
6932 && action->removed_bytes < 0))
6933 target_removed_bytes += removed_bytes;
6935 self_offset -= self_removed_bytes;
6936 target_offset -= target_removed_bytes;
6938 /* Try to encode it. Get the operand and check. */
6939 if (is_alt_relocation (ELF32_R_TYPE (irel->r_info)))
6941 /* None of the current alternate relocs are PC-relative,
6942 and only PC-relative relocs matter here. */
6946 xtensa_opcode opcode;
6949 opcode = get_relocation_opcode (abfd, sec, contents, irel);
6950 if (opcode == XTENSA_UNDEFINED)
6953 opnum = get_relocation_opnd (opcode, ELF32_R_TYPE (irel->r_info));
6954 if (opnum == XTENSA_UNDEFINED)
6957 if (!pcrel_reloc_fits (opcode, opnum, self_offset, target_offset))
6967 check_section_ebb_reduces (const ebb_constraint *constraint)
6972 for (i = 0; i < constraint->action_count; i++)
6974 const proposed_action *action = &constraint->actions[i];
6975 if (action->do_action)
6976 removed += action->removed_bytes;
6986 text_action_add_proposed (text_action_list *l,
6987 const ebb_constraint *ebb_table,
6992 for (i = 0; i < ebb_table->action_count; i++)
6994 proposed_action *action = &ebb_table->actions[i];
6996 if (!action->do_action)
6998 switch (action->action)
7000 case ta_remove_insn:
7001 case ta_remove_longcall:
7002 case ta_convert_longcall:
7003 case ta_narrow_insn:
7006 case ta_remove_literal:
7007 text_action_add (l, action->action, sec, action->offset,
7008 action->removed_bytes);
7021 compute_fill_extra_space (property_table_entry *entry)
7023 int fill_extra_space;
7028 if ((entry->flags & XTENSA_PROP_UNREACHABLE) == 0)
7031 fill_extra_space = entry->size;
7032 if ((entry->flags & XTENSA_PROP_ALIGN) != 0)
7034 /* Fill bytes for alignment:
7035 (2**n)-1 - (addr + (2**n)-1) & (2**n -1) */
7036 int pow = GET_XTENSA_PROP_ALIGNMENT (entry->flags);
7037 int nsm = (1 << pow) - 1;
7038 bfd_vma addr = entry->address + entry->size;
7039 bfd_vma align_fill = nsm - ((addr + nsm) & nsm);
7040 fill_extra_space += align_fill;
7042 return fill_extra_space;
7046 /* First relaxation pass. */
7048 /* If the section contains relaxable literals, check each literal to
7049 see if it has the same value as another literal that has already
7050 been seen, either in the current section or a previous one. If so,
7051 add an entry to the per-section list of removed literals. The
7052 actual changes are deferred until the next pass. */
7055 compute_removed_literals (bfd *abfd,
7057 struct bfd_link_info *link_info,
7058 value_map_hash_table *values)
7060 xtensa_relax_info *relax_info;
7062 Elf_Internal_Rela *internal_relocs;
7063 source_reloc *src_relocs, *rel;
7064 bfd_boolean ok = TRUE;
7065 property_table_entry *prop_table = NULL;
7068 bfd_boolean last_loc_is_prev = FALSE;
7069 bfd_vma last_target_offset = 0;
7070 section_cache_t target_sec_cache;
7071 bfd_size_type sec_size;
7073 init_section_cache (&target_sec_cache);
7075 /* Do nothing if it is not a relaxable literal section. */
7076 relax_info = get_xtensa_relax_info (sec);
7077 BFD_ASSERT (relax_info);
7078 if (!relax_info->is_relaxable_literal_section)
7081 internal_relocs = retrieve_internal_relocs (abfd, sec,
7082 link_info->keep_memory);
7084 sec_size = bfd_get_section_limit (abfd, sec);
7085 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
7086 if (contents == NULL && sec_size != 0)
7092 /* Sort the source_relocs by target offset. */
7093 src_relocs = relax_info->src_relocs;
7094 qsort (src_relocs, relax_info->src_count,
7095 sizeof (source_reloc), source_reloc_compare);
7096 qsort (internal_relocs, sec->reloc_count, sizeof (Elf_Internal_Rela),
7097 internal_reloc_compare);
7099 ptblsize = xtensa_read_table_entries (abfd, sec, &prop_table,
7100 XTENSA_PROP_SEC_NAME, FALSE);
7108 for (i = 0; i < relax_info->src_count; i++)
7110 Elf_Internal_Rela *irel = NULL;
7112 rel = &src_relocs[i];
7113 if (get_l32r_opcode () != rel->opcode)
7115 irel = get_irel_at_offset (sec, internal_relocs,
7116 rel->r_rel.target_offset);
7118 /* If the relocation on this is not a simple R_XTENSA_32 or
7119 R_XTENSA_PLT then do not consider it. This may happen when
7120 the difference of two symbols is used in a literal. */
7121 if (irel && (ELF32_R_TYPE (irel->r_info) != R_XTENSA_32
7122 && ELF32_R_TYPE (irel->r_info) != R_XTENSA_PLT))
7125 /* If the target_offset for this relocation is the same as the
7126 previous relocation, then we've already considered whether the
7127 literal can be coalesced. Skip to the next one.... */
7128 if (i != 0 && prev_i != -1
7129 && src_relocs[i-1].r_rel.target_offset == rel->r_rel.target_offset)
7133 if (last_loc_is_prev &&
7134 last_target_offset + 4 != rel->r_rel.target_offset)
7135 last_loc_is_prev = FALSE;
7137 /* Check if the relocation was from an L32R that is being removed
7138 because a CALLX was converted to a direct CALL, and check if
7139 there are no other relocations to the literal. */
7140 if (is_removable_literal (rel, i, src_relocs, relax_info->src_count))
7142 if (!remove_dead_literal (abfd, sec, link_info, internal_relocs,
7143 irel, rel, prop_table, ptblsize))
7148 last_target_offset = rel->r_rel.target_offset;
7152 if (!identify_literal_placement (abfd, sec, contents, link_info,
7154 &last_loc_is_prev, irel,
7155 relax_info->src_count - i, rel,
7156 prop_table, ptblsize,
7157 &target_sec_cache, rel->is_abs_literal))
7162 last_target_offset = rel->r_rel.target_offset;
7166 print_removed_literals (stderr, &relax_info->removed_list);
7167 print_action_list (stderr, &relax_info->action_list);
7171 if (prop_table) free (prop_table);
7172 clear_section_cache (&target_sec_cache);
7174 release_contents (sec, contents);
7175 release_internal_relocs (sec, internal_relocs);
7180 static Elf_Internal_Rela *
7181 get_irel_at_offset (asection *sec,
7182 Elf_Internal_Rela *internal_relocs,
7186 Elf_Internal_Rela *irel;
7188 Elf_Internal_Rela key;
7190 if (!internal_relocs)
7193 key.r_offset = offset;
7194 irel = bsearch (&key, internal_relocs, sec->reloc_count,
7195 sizeof (Elf_Internal_Rela), internal_reloc_matches);
7199 /* bsearch does not guarantee which will be returned if there are
7200 multiple matches. We need the first that is not an alignment. */
7201 i = irel - internal_relocs;
7204 if (internal_relocs[i-1].r_offset != offset)
7208 for ( ; i < sec->reloc_count; i++)
7210 irel = &internal_relocs[i];
7211 r_type = ELF32_R_TYPE (irel->r_info);
7212 if (irel->r_offset == offset && r_type != R_XTENSA_NONE)
7221 is_removable_literal (const source_reloc *rel,
7223 const source_reloc *src_relocs,
7226 const source_reloc *curr_rel;
7230 for (++i; i < src_count; ++i)
7232 curr_rel = &src_relocs[i];
7233 /* If all others have the same target offset.... */
7234 if (curr_rel->r_rel.target_offset != rel->r_rel.target_offset)
7237 if (!curr_rel->is_null
7238 && !xtensa_is_property_section (curr_rel->source_sec)
7239 && !(curr_rel->source_sec->flags & SEC_DEBUGGING))
7247 remove_dead_literal (bfd *abfd,
7249 struct bfd_link_info *link_info,
7250 Elf_Internal_Rela *internal_relocs,
7251 Elf_Internal_Rela *irel,
7253 property_table_entry *prop_table,
7256 property_table_entry *entry;
7257 xtensa_relax_info *relax_info;
7259 relax_info = get_xtensa_relax_info (sec);
7263 entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
7264 sec->vma + rel->r_rel.target_offset);
7266 /* Mark the unused literal so that it will be removed. */
7267 add_removed_literal (&relax_info->removed_list, &rel->r_rel, NULL);
7269 text_action_add (&relax_info->action_list,
7270 ta_remove_literal, sec, rel->r_rel.target_offset, 4);
7272 /* If the section is 4-byte aligned, do not add fill. */
7273 if (sec->alignment_power > 2)
7275 int fill_extra_space;
7276 bfd_vma entry_sec_offset;
7278 property_table_entry *the_add_entry;
7282 entry_sec_offset = entry->address - sec->vma + entry->size;
7284 entry_sec_offset = rel->r_rel.target_offset + 4;
7286 /* If the literal range is at the end of the section,
7288 the_add_entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
7290 fill_extra_space = compute_fill_extra_space (the_add_entry);
7292 fa = find_fill_action (&relax_info->action_list, sec, entry_sec_offset);
7293 removed_diff = compute_removed_action_diff (fa, sec, entry_sec_offset,
7294 -4, fill_extra_space);
7296 adjust_fill_action (fa, removed_diff);
7298 text_action_add (&relax_info->action_list,
7299 ta_fill, sec, entry_sec_offset, removed_diff);
7302 /* Zero out the relocation on this literal location. */
7305 if (elf_hash_table (link_info)->dynamic_sections_created)
7306 shrink_dynamic_reloc_sections (link_info, abfd, sec, irel);
7308 irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
7309 pin_internal_relocs (sec, internal_relocs);
7312 /* Do not modify "last_loc_is_prev". */
7318 identify_literal_placement (bfd *abfd,
7321 struct bfd_link_info *link_info,
7322 value_map_hash_table *values,
7323 bfd_boolean *last_loc_is_prev_p,
7324 Elf_Internal_Rela *irel,
7325 int remaining_src_rels,
7327 property_table_entry *prop_table,
7329 section_cache_t *target_sec_cache,
7330 bfd_boolean is_abs_literal)
7334 xtensa_relax_info *relax_info;
7335 bfd_boolean literal_placed = FALSE;
7337 unsigned long value;
7338 bfd_boolean final_static_link;
7339 bfd_size_type sec_size;
7341 relax_info = get_xtensa_relax_info (sec);
7345 sec_size = bfd_get_section_limit (abfd, sec);
7348 (!link_info->relocatable
7349 && !elf_hash_table (link_info)->dynamic_sections_created);
7351 /* The placement algorithm first checks to see if the literal is
7352 already in the value map. If so and the value map is reachable
7353 from all uses, then the literal is moved to that location. If
7354 not, then we identify the last location where a fresh literal was
7355 placed. If the literal can be safely moved there, then we do so.
7356 If not, then we assume that the literal is not to move and leave
7357 the literal where it is, marking it as the last literal
7360 /* Find the literal value. */
7362 r_reloc_init (&r_rel, abfd, irel, contents, sec_size);
7365 BFD_ASSERT (rel->r_rel.target_offset < sec_size);
7366 value = bfd_get_32 (abfd, contents + rel->r_rel.target_offset);
7368 init_literal_value (&val, &r_rel, value, is_abs_literal);
7370 /* Check if we've seen another literal with the same value that
7371 is in the same output section. */
7372 val_map = value_map_get_cached_value (values, &val, final_static_link);
7375 && (r_reloc_get_section (&val_map->loc)->output_section
7376 == sec->output_section)
7377 && relocations_reach (rel, remaining_src_rels, &val_map->loc)
7378 && coalesce_shared_literal (sec, rel, prop_table, ptblsize, val_map))
7380 /* No change to last_loc_is_prev. */
7381 literal_placed = TRUE;
7384 /* For relocatable links, do not try to move literals. To do it
7385 correctly might increase the number of relocations in an input
7386 section making the default relocatable linking fail. */
7387 if (!link_info->relocatable && !literal_placed
7388 && values->has_last_loc && !(*last_loc_is_prev_p))
7390 asection *target_sec = r_reloc_get_section (&values->last_loc);
7391 if (target_sec && target_sec->output_section == sec->output_section)
7393 /* Increment the virtual offset. */
7394 r_reloc try_loc = values->last_loc;
7395 try_loc.virtual_offset += 4;
7397 /* There is a last loc that was in the same output section. */
7398 if (relocations_reach (rel, remaining_src_rels, &try_loc)
7399 && move_shared_literal (sec, link_info, rel,
7400 prop_table, ptblsize,
7401 &try_loc, &val, target_sec_cache))
7403 values->last_loc.virtual_offset += 4;
7404 literal_placed = TRUE;
7406 val_map = add_value_map (values, &val, &try_loc,
7409 val_map->loc = try_loc;
7414 if (!literal_placed)
7416 /* Nothing worked, leave the literal alone but update the last loc. */
7417 values->has_last_loc = TRUE;
7418 values->last_loc = rel->r_rel;
7420 val_map = add_value_map (values, &val, &rel->r_rel, final_static_link);
7422 val_map->loc = rel->r_rel;
7423 *last_loc_is_prev_p = TRUE;
7430 /* Check if the original relocations (presumably on L32R instructions)
7431 identified by reloc[0..N] can be changed to reference the literal
7432 identified by r_rel. If r_rel is out of range for any of the
7433 original relocations, then we don't want to coalesce the original
7434 literal with the one at r_rel. We only check reloc[0..N], where the
7435 offsets are all the same as for reloc[0] (i.e., they're all
7436 referencing the same literal) and where N is also bounded by the
7437 number of remaining entries in the "reloc" array. The "reloc" array
7438 is sorted by target offset so we know all the entries for the same
7439 literal will be contiguous. */
7442 relocations_reach (source_reloc *reloc,
7443 int remaining_relocs,
7444 const r_reloc *r_rel)
7446 bfd_vma from_offset, source_address, dest_address;
7450 if (!r_reloc_is_defined (r_rel))
7453 sec = r_reloc_get_section (r_rel);
7454 from_offset = reloc[0].r_rel.target_offset;
7456 for (i = 0; i < remaining_relocs; i++)
7458 if (reloc[i].r_rel.target_offset != from_offset)
7461 /* Ignore relocations that have been removed. */
7462 if (reloc[i].is_null)
7465 /* The original and new output section for these must be the same
7466 in order to coalesce. */
7467 if (r_reloc_get_section (&reloc[i].r_rel)->output_section
7468 != sec->output_section)
7471 /* A literal with no PC-relative relocations can be moved anywhere. */
7472 if (reloc[i].opnd != -1)
7474 /* Otherwise, check to see that it fits. */
7475 source_address = (reloc[i].source_sec->output_section->vma
7476 + reloc[i].source_sec->output_offset
7477 + reloc[i].r_rel.rela.r_offset);
7478 dest_address = (sec->output_section->vma
7479 + sec->output_offset
7480 + r_rel->target_offset);
7482 if (!pcrel_reloc_fits (reloc[i].opcode, reloc[i].opnd,
7483 source_address, dest_address))
7492 /* Move a literal to another literal location because it is
7493 the same as the other literal value. */
7496 coalesce_shared_literal (asection *sec,
7498 property_table_entry *prop_table,
7502 property_table_entry *entry;
7504 property_table_entry *the_add_entry;
7506 xtensa_relax_info *relax_info;
7508 relax_info = get_xtensa_relax_info (sec);
7512 entry = elf_xtensa_find_property_entry
7513 (prop_table, ptblsize, sec->vma + rel->r_rel.target_offset);
7514 if (entry && (entry->flags & XTENSA_PROP_INSN_NO_TRANSFORM))
7517 /* Mark that the literal will be coalesced. */
7518 add_removed_literal (&relax_info->removed_list, &rel->r_rel, &val_map->loc);
7520 text_action_add (&relax_info->action_list,
7521 ta_remove_literal, sec, rel->r_rel.target_offset, 4);
7523 /* If the section is 4-byte aligned, do not add fill. */
7524 if (sec->alignment_power > 2)
7526 int fill_extra_space;
7527 bfd_vma entry_sec_offset;
7530 entry_sec_offset = entry->address - sec->vma + entry->size;
7532 entry_sec_offset = rel->r_rel.target_offset + 4;
7534 /* If the literal range is at the end of the section,
7536 fill_extra_space = 0;
7537 the_add_entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
7539 if (the_add_entry && (the_add_entry->flags & XTENSA_PROP_UNREACHABLE))
7540 fill_extra_space = the_add_entry->size;
7542 fa = find_fill_action (&relax_info->action_list, sec, entry_sec_offset);
7543 removed_diff = compute_removed_action_diff (fa, sec, entry_sec_offset,
7544 -4, fill_extra_space);
7546 adjust_fill_action (fa, removed_diff);
7548 text_action_add (&relax_info->action_list,
7549 ta_fill, sec, entry_sec_offset, removed_diff);
7556 /* Move a literal to another location. This may actually increase the
7557 total amount of space used because of alignments so we need to do
7558 this carefully. Also, it may make a branch go out of range. */
7561 move_shared_literal (asection *sec,
7562 struct bfd_link_info *link_info,
7564 property_table_entry *prop_table,
7566 const r_reloc *target_loc,
7567 const literal_value *lit_value,
7568 section_cache_t *target_sec_cache)
7570 property_table_entry *the_add_entry, *src_entry, *target_entry = NULL;
7571 text_action *fa, *target_fa;
7573 xtensa_relax_info *relax_info, *target_relax_info;
7574 asection *target_sec;
7576 ebb_constraint ebb_table;
7577 bfd_boolean relocs_fit;
7579 /* If this routine always returns FALSE, the literals that cannot be
7580 coalesced will not be moved. */
7581 if (elf32xtensa_no_literal_movement)
7584 relax_info = get_xtensa_relax_info (sec);
7588 target_sec = r_reloc_get_section (target_loc);
7589 target_relax_info = get_xtensa_relax_info (target_sec);
7591 /* Literals to undefined sections may not be moved because they
7592 must report an error. */
7593 if (bfd_is_und_section (target_sec))
7596 src_entry = elf_xtensa_find_property_entry
7597 (prop_table, ptblsize, sec->vma + rel->r_rel.target_offset);
7599 if (!section_cache_section (target_sec_cache, target_sec, link_info))
7602 target_entry = elf_xtensa_find_property_entry
7603 (target_sec_cache->ptbl, target_sec_cache->pte_count,
7604 target_sec->vma + target_loc->target_offset);
7609 /* Make sure that we have not broken any branches. */
7612 init_ebb_constraint (&ebb_table);
7613 ebb = &ebb_table.ebb;
7614 init_ebb (ebb, target_sec_cache->sec, target_sec_cache->contents,
7615 target_sec_cache->content_length,
7616 target_sec_cache->ptbl, target_sec_cache->pte_count,
7617 target_sec_cache->relocs, target_sec_cache->reloc_count);
7619 /* Propose to add 4 bytes + worst-case alignment size increase to
7621 ebb_propose_action (&ebb_table, EBB_NO_ALIGN, 0,
7622 ta_fill, target_loc->target_offset,
7623 -4 - (1 << target_sec->alignment_power), TRUE);
7625 /* Check all of the PC-relative relocations to make sure they still fit. */
7626 relocs_fit = check_section_ebb_pcrels_fit (target_sec->owner, target_sec,
7627 target_sec_cache->contents,
7628 target_sec_cache->relocs,
7634 text_action_add_literal (&target_relax_info->action_list,
7635 ta_add_literal, target_loc, lit_value, -4);
7637 if (target_sec->alignment_power > 2 && target_entry != src_entry)
7639 /* May need to add or remove some fill to maintain alignment. */
7640 int fill_extra_space;
7641 bfd_vma entry_sec_offset;
7644 target_entry->address - target_sec->vma + target_entry->size;
7646 /* If the literal range is at the end of the section,
7648 fill_extra_space = 0;
7650 elf_xtensa_find_property_entry (target_sec_cache->ptbl,
7651 target_sec_cache->pte_count,
7653 if (the_add_entry && (the_add_entry->flags & XTENSA_PROP_UNREACHABLE))
7654 fill_extra_space = the_add_entry->size;
7656 target_fa = find_fill_action (&target_relax_info->action_list,
7657 target_sec, entry_sec_offset);
7658 removed_diff = compute_removed_action_diff (target_fa, target_sec,
7659 entry_sec_offset, 4,
7662 adjust_fill_action (target_fa, removed_diff);
7664 text_action_add (&target_relax_info->action_list,
7665 ta_fill, target_sec, entry_sec_offset, removed_diff);
7668 /* Mark that the literal will be moved to the new location. */
7669 add_removed_literal (&relax_info->removed_list, &rel->r_rel, target_loc);
7671 /* Remove the literal. */
7672 text_action_add (&relax_info->action_list,
7673 ta_remove_literal, sec, rel->r_rel.target_offset, 4);
7675 /* If the section is 4-byte aligned, do not add fill. */
7676 if (sec->alignment_power > 2 && target_entry != src_entry)
7678 int fill_extra_space;
7679 bfd_vma entry_sec_offset;
7682 entry_sec_offset = src_entry->address - sec->vma + src_entry->size;
7684 entry_sec_offset = rel->r_rel.target_offset+4;
7686 /* If the literal range is at the end of the section,
7688 fill_extra_space = 0;
7689 the_add_entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
7691 if (the_add_entry && (the_add_entry->flags & XTENSA_PROP_UNREACHABLE))
7692 fill_extra_space = the_add_entry->size;
7694 fa = find_fill_action (&relax_info->action_list, sec, entry_sec_offset);
7695 removed_diff = compute_removed_action_diff (fa, sec, entry_sec_offset,
7696 -4, fill_extra_space);
7698 adjust_fill_action (fa, removed_diff);
7700 text_action_add (&relax_info->action_list,
7701 ta_fill, sec, entry_sec_offset, removed_diff);
7708 /* Second relaxation pass. */
7710 /* Modify all of the relocations to point to the right spot, and if this
7711 is a relaxable section, delete the unwanted literals and fix the
7715 relax_section (bfd *abfd, asection *sec, struct bfd_link_info *link_info)
7717 Elf_Internal_Rela *internal_relocs;
7718 xtensa_relax_info *relax_info;
7720 bfd_boolean ok = TRUE;
7722 bfd_boolean rv = FALSE;
7723 bfd_boolean virtual_action;
7724 bfd_size_type sec_size;
7726 sec_size = bfd_get_section_limit (abfd, sec);
7727 relax_info = get_xtensa_relax_info (sec);
7728 BFD_ASSERT (relax_info);
7730 /* First translate any of the fixes that have been added already. */
7731 translate_section_fixes (sec);
7733 /* Handle property sections (e.g., literal tables) specially. */
7734 if (xtensa_is_property_section (sec))
7736 BFD_ASSERT (!relax_info->is_relaxable_literal_section);
7737 return relax_property_section (abfd, sec, link_info);
7740 internal_relocs = retrieve_internal_relocs (abfd, sec,
7741 link_info->keep_memory);
7742 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
7743 if (contents == NULL && sec_size != 0)
7749 if (internal_relocs)
7751 for (i = 0; i < sec->reloc_count; i++)
7753 Elf_Internal_Rela *irel;
7754 xtensa_relax_info *target_relax_info;
7755 bfd_vma source_offset, old_source_offset;
7758 asection *target_sec;
7760 /* Locally change the source address.
7761 Translate the target to the new target address.
7762 If it points to this section and has been removed,
7766 irel = &internal_relocs[i];
7767 source_offset = irel->r_offset;
7768 old_source_offset = source_offset;
7770 r_type = ELF32_R_TYPE (irel->r_info);
7771 r_reloc_init (&r_rel, abfd, irel, contents,
7772 bfd_get_section_limit (abfd, sec));
7774 /* If this section could have changed then we may need to
7775 change the relocation's offset. */
7777 if (relax_info->is_relaxable_literal_section
7778 || relax_info->is_relaxable_asm_section)
7780 if (r_type != R_XTENSA_NONE
7781 && find_removed_literal (&relax_info->removed_list,
7784 /* Remove this relocation. */
7785 if (elf_hash_table (link_info)->dynamic_sections_created)
7786 shrink_dynamic_reloc_sections (link_info, abfd, sec, irel);
7787 irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
7788 irel->r_offset = offset_with_removed_text
7789 (&relax_info->action_list, irel->r_offset);
7790 pin_internal_relocs (sec, internal_relocs);
7794 if (r_type == R_XTENSA_ASM_SIMPLIFY)
7796 text_action *action =
7797 find_insn_action (&relax_info->action_list,
7799 if (action && (action->action == ta_convert_longcall
7800 || action->action == ta_remove_longcall))
7802 bfd_reloc_status_type retval;
7803 char *error_message = NULL;
7805 retval = contract_asm_expansion (contents, sec_size,
7806 irel, &error_message);
7807 if (retval != bfd_reloc_ok)
7809 (*link_info->callbacks->reloc_dangerous)
7810 (link_info, error_message, abfd, sec,
7814 /* Update the action so that the code that moves
7815 the contents will do the right thing. */
7816 if (action->action == ta_remove_longcall)
7817 action->action = ta_remove_insn;
7819 action->action = ta_none;
7820 /* Refresh the info in the r_rel. */
7821 r_reloc_init (&r_rel, abfd, irel, contents, sec_size);
7822 r_type = ELF32_R_TYPE (irel->r_info);
7826 source_offset = offset_with_removed_text
7827 (&relax_info->action_list, irel->r_offset);
7828 irel->r_offset = source_offset;
7831 /* If the target section could have changed then
7832 we may need to change the relocation's target offset. */
7834 target_sec = r_reloc_get_section (&r_rel);
7835 target_relax_info = get_xtensa_relax_info (target_sec);
7837 if (target_relax_info
7838 && (target_relax_info->is_relaxable_literal_section
7839 || target_relax_info->is_relaxable_asm_section))
7843 bfd_vma addend_displacement;
7845 translate_reloc (&r_rel, &new_reloc);
7847 if (r_type == R_XTENSA_DIFF8
7848 || r_type == R_XTENSA_DIFF16
7849 || r_type == R_XTENSA_DIFF32)
7851 bfd_vma diff_value = 0, new_end_offset, diff_mask = 0;
7853 if (bfd_get_section_limit (abfd, sec) < old_source_offset)
7855 (*link_info->callbacks->reloc_dangerous)
7856 (link_info, _("invalid relocation address"),
7857 abfd, sec, old_source_offset);
7863 case R_XTENSA_DIFF8:
7865 bfd_get_8 (abfd, &contents[old_source_offset]);
7867 case R_XTENSA_DIFF16:
7869 bfd_get_16 (abfd, &contents[old_source_offset]);
7871 case R_XTENSA_DIFF32:
7873 bfd_get_32 (abfd, &contents[old_source_offset]);
7877 new_end_offset = offset_with_removed_text
7878 (&target_relax_info->action_list,
7879 r_rel.target_offset + diff_value);
7880 diff_value = new_end_offset - new_reloc.target_offset;
7884 case R_XTENSA_DIFF8:
7886 bfd_put_8 (abfd, diff_value,
7887 &contents[old_source_offset]);
7889 case R_XTENSA_DIFF16:
7891 bfd_put_16 (abfd, diff_value,
7892 &contents[old_source_offset]);
7894 case R_XTENSA_DIFF32:
7895 diff_mask = 0xffffffff;
7896 bfd_put_32 (abfd, diff_value,
7897 &contents[old_source_offset]);
7901 /* Check for overflow. */
7902 if ((diff_value & ~diff_mask) != 0)
7904 (*link_info->callbacks->reloc_dangerous)
7905 (link_info, _("overflow after relaxation"),
7906 abfd, sec, old_source_offset);
7910 pin_contents (sec, contents);
7913 /* FIXME: If the relocation still references a section in
7914 the same input file, the relocation should be modified
7915 directly instead of adding a "fix" record. */
7917 addend_displacement =
7918 new_reloc.target_offset + new_reloc.virtual_offset;
7920 fix = reloc_bfd_fix_init (sec, source_offset, r_type, 0,
7921 r_reloc_get_section (&new_reloc),
7922 addend_displacement, TRUE);
7926 pin_internal_relocs (sec, internal_relocs);
7930 if ((relax_info->is_relaxable_literal_section
7931 || relax_info->is_relaxable_asm_section)
7932 && relax_info->action_list.head)
7934 /* Walk through the planned actions and build up a table
7935 of move, copy and fill records. Use the move, copy and
7936 fill records to perform the actions once. */
7938 bfd_size_type size = sec->size;
7940 bfd_size_type final_size, copy_size, orig_insn_size;
7941 bfd_byte *scratch = NULL;
7942 bfd_byte *dup_contents = NULL;
7943 bfd_size_type orig_size = size;
7944 bfd_vma orig_dot = 0;
7945 bfd_vma orig_dot_copied = 0; /* Byte copied already from
7946 orig dot in physical memory. */
7947 bfd_vma orig_dot_vo = 0; /* Virtual offset from orig_dot. */
7948 bfd_vma dup_dot = 0;
7950 text_action *action = relax_info->action_list.head;
7952 final_size = sec->size;
7953 for (action = relax_info->action_list.head; action;
7954 action = action->next)
7956 final_size -= action->removed_bytes;
7959 scratch = (bfd_byte *) bfd_zmalloc (final_size);
7960 dup_contents = (bfd_byte *) bfd_zmalloc (final_size);
7962 /* The dot is the current fill location. */
7964 print_action_list (stderr, &relax_info->action_list);
7967 for (action = relax_info->action_list.head; action;
7968 action = action->next)
7970 virtual_action = FALSE;
7971 if (action->offset > orig_dot)
7973 orig_dot += orig_dot_copied;
7974 orig_dot_copied = 0;
7976 /* Out of the virtual world. */
7979 if (action->offset > orig_dot)
7981 copy_size = action->offset - orig_dot;
7982 memmove (&dup_contents[dup_dot], &contents[orig_dot], copy_size);
7983 orig_dot += copy_size;
7984 dup_dot += copy_size;
7985 BFD_ASSERT (action->offset == orig_dot);
7987 else if (action->offset < orig_dot)
7989 if (action->action == ta_fill
7990 && action->offset - action->removed_bytes == orig_dot)
7992 /* This is OK because the fill only effects the dup_dot. */
7994 else if (action->action == ta_add_literal)
7996 /* TBD. Might need to handle this. */
7999 if (action->offset == orig_dot)
8001 if (action->virtual_offset > orig_dot_vo)
8003 if (orig_dot_vo == 0)
8005 /* Need to copy virtual_offset bytes. Probably four. */
8006 copy_size = action->virtual_offset - orig_dot_vo;
8007 memmove (&dup_contents[dup_dot],
8008 &contents[orig_dot], copy_size);
8009 orig_dot_copied = copy_size;
8010 dup_dot += copy_size;
8012 virtual_action = TRUE;
8015 BFD_ASSERT (action->virtual_offset <= orig_dot_vo);
8017 switch (action->action)
8019 case ta_remove_literal:
8020 case ta_remove_insn:
8021 BFD_ASSERT (action->removed_bytes >= 0);
8022 orig_dot += action->removed_bytes;
8025 case ta_narrow_insn:
8028 memmove (scratch, &contents[orig_dot], orig_insn_size);
8029 BFD_ASSERT (action->removed_bytes == 1);
8030 rv = narrow_instruction (scratch, final_size, 0, TRUE);
8032 memmove (&dup_contents[dup_dot], scratch, copy_size);
8033 orig_dot += orig_insn_size;
8034 dup_dot += copy_size;
8038 if (action->removed_bytes >= 0)
8039 orig_dot += action->removed_bytes;
8042 /* Already zeroed in dup_contents. Just bump the
8044 dup_dot += (-action->removed_bytes);
8049 BFD_ASSERT (action->removed_bytes == 0);
8052 case ta_convert_longcall:
8053 case ta_remove_longcall:
8054 /* These will be removed or converted before we get here. */
8061 memmove (scratch, &contents[orig_dot], orig_insn_size);
8062 BFD_ASSERT (action->removed_bytes == -1);
8063 rv = widen_instruction (scratch, final_size, 0, TRUE);
8065 memmove (&dup_contents[dup_dot], scratch, copy_size);
8066 orig_dot += orig_insn_size;
8067 dup_dot += copy_size;
8070 case ta_add_literal:
8073 BFD_ASSERT (action->removed_bytes == -4);
8074 /* TBD -- place the literal value here and insert
8076 memset (&dup_contents[dup_dot], 0, 4);
8077 pin_internal_relocs (sec, internal_relocs);
8078 pin_contents (sec, contents);
8080 if (!move_literal (abfd, link_info, sec, dup_dot, dup_contents,
8081 relax_info, &internal_relocs, &action->value))
8085 orig_dot_vo += copy_size;
8087 orig_dot += orig_insn_size;
8088 dup_dot += copy_size;
8092 /* Not implemented yet. */
8097 size -= action->removed_bytes;
8098 removed += action->removed_bytes;
8099 BFD_ASSERT (dup_dot <= final_size);
8100 BFD_ASSERT (orig_dot <= orig_size);
8103 orig_dot += orig_dot_copied;
8104 orig_dot_copied = 0;
8106 if (orig_dot != orig_size)
8108 copy_size = orig_size - orig_dot;
8109 BFD_ASSERT (orig_size > orig_dot);
8110 BFD_ASSERT (dup_dot + copy_size == final_size);
8111 memmove (&dup_contents[dup_dot], &contents[orig_dot], copy_size);
8112 orig_dot += copy_size;
8113 dup_dot += copy_size;
8115 BFD_ASSERT (orig_size == orig_dot);
8116 BFD_ASSERT (final_size == dup_dot);
8118 /* Move the dup_contents back. */
8119 if (final_size > orig_size)
8121 /* Contents need to be reallocated. Swap the dup_contents into
8123 sec->contents = dup_contents;
8125 contents = dup_contents;
8126 pin_contents (sec, contents);
8130 BFD_ASSERT (final_size <= orig_size);
8131 memset (contents, 0, orig_size);
8132 memcpy (contents, dup_contents, final_size);
8133 free (dup_contents);
8136 pin_contents (sec, contents);
8138 sec->size = final_size;
8142 release_internal_relocs (sec, internal_relocs);
8143 release_contents (sec, contents);
8149 translate_section_fixes (asection *sec)
8151 xtensa_relax_info *relax_info;
8154 relax_info = get_xtensa_relax_info (sec);
8158 for (r = relax_info->fix_list; r != NULL; r = r->next)
8159 if (!translate_reloc_bfd_fix (r))
8166 /* Translate a fix given the mapping in the relax info for the target
8167 section. If it has already been translated, no work is required. */
8170 translate_reloc_bfd_fix (reloc_bfd_fix *fix)
8172 reloc_bfd_fix new_fix;
8174 xtensa_relax_info *relax_info;
8175 removed_literal *removed;
8176 bfd_vma new_offset, target_offset;
8178 if (fix->translated)
8181 sec = fix->target_sec;
8182 target_offset = fix->target_offset;
8184 relax_info = get_xtensa_relax_info (sec);
8187 fix->translated = TRUE;
8193 /* The fix does not need to be translated if the section cannot change. */
8194 if (!relax_info->is_relaxable_literal_section
8195 && !relax_info->is_relaxable_asm_section)
8197 fix->translated = TRUE;
8201 /* If the literal has been moved and this relocation was on an
8202 opcode, then the relocation should move to the new literal
8203 location. Otherwise, the relocation should move within the
8207 if (is_operand_relocation (fix->src_type))
8209 /* Check if the original relocation is against a literal being
8211 removed = find_removed_literal (&relax_info->removed_list,
8219 /* The fact that there is still a relocation to this literal indicates
8220 that the literal is being coalesced, not simply removed. */
8221 BFD_ASSERT (removed->to.abfd != NULL);
8223 /* This was moved to some other address (possibly another section). */
8224 new_sec = r_reloc_get_section (&removed->to);
8228 relax_info = get_xtensa_relax_info (sec);
8230 (!relax_info->is_relaxable_literal_section
8231 && !relax_info->is_relaxable_asm_section))
8233 target_offset = removed->to.target_offset;
8234 new_fix.target_sec = new_sec;
8235 new_fix.target_offset = target_offset;
8236 new_fix.translated = TRUE;
8241 target_offset = removed->to.target_offset;
8242 new_fix.target_sec = new_sec;
8245 /* The target address may have been moved within its section. */
8246 new_offset = offset_with_removed_text (&relax_info->action_list,
8249 new_fix.target_offset = new_offset;
8250 new_fix.target_offset = new_offset;
8251 new_fix.translated = TRUE;
8257 /* Fix up a relocation to take account of removed literals. */
8260 translate_reloc (const r_reloc *orig_rel, r_reloc *new_rel)
8263 xtensa_relax_info *relax_info;
8264 removed_literal *removed;
8265 bfd_vma new_offset, target_offset, removed_bytes;
8267 *new_rel = *orig_rel;
8269 if (!r_reloc_is_defined (orig_rel))
8271 sec = r_reloc_get_section (orig_rel);
8273 relax_info = get_xtensa_relax_info (sec);
8274 BFD_ASSERT (relax_info);
8276 if (!relax_info->is_relaxable_literal_section
8277 && !relax_info->is_relaxable_asm_section)
8280 target_offset = orig_rel->target_offset;
8283 if (is_operand_relocation (ELF32_R_TYPE (orig_rel->rela.r_info)))
8285 /* Check if the original relocation is against a literal being
8287 removed = find_removed_literal (&relax_info->removed_list,
8290 if (removed && removed->to.abfd)
8294 /* The fact that there is still a relocation to this literal indicates
8295 that the literal is being coalesced, not simply removed. */
8296 BFD_ASSERT (removed->to.abfd != NULL);
8298 /* This was moved to some other address
8299 (possibly in another section). */
8300 *new_rel = removed->to;
8301 new_sec = r_reloc_get_section (new_rel);
8305 relax_info = get_xtensa_relax_info (sec);
8307 || (!relax_info->is_relaxable_literal_section
8308 && !relax_info->is_relaxable_asm_section))
8311 target_offset = new_rel->target_offset;
8314 /* ...and the target address may have been moved within its section. */
8315 new_offset = offset_with_removed_text (&relax_info->action_list,
8318 /* Modify the offset and addend. */
8319 removed_bytes = target_offset - new_offset;
8320 new_rel->target_offset = new_offset;
8321 new_rel->rela.r_addend -= removed_bytes;
8325 /* For dynamic links, there may be a dynamic relocation for each
8326 literal. The number of dynamic relocations must be computed in
8327 size_dynamic_sections, which occurs before relaxation. When a
8328 literal is removed, this function checks if there is a corresponding
8329 dynamic relocation and shrinks the size of the appropriate dynamic
8330 relocation section accordingly. At this point, the contents of the
8331 dynamic relocation sections have not yet been filled in, so there's
8332 nothing else that needs to be done. */
8335 shrink_dynamic_reloc_sections (struct bfd_link_info *info,
8337 asection *input_section,
8338 Elf_Internal_Rela *rel)
8340 Elf_Internal_Shdr *symtab_hdr;
8341 struct elf_link_hash_entry **sym_hashes;
8342 unsigned long r_symndx;
8344 struct elf_link_hash_entry *h;
8345 bfd_boolean dynamic_symbol;
8347 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
8348 sym_hashes = elf_sym_hashes (abfd);
8350 r_type = ELF32_R_TYPE (rel->r_info);
8351 r_symndx = ELF32_R_SYM (rel->r_info);
8353 if (r_symndx < symtab_hdr->sh_info)
8356 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
8358 dynamic_symbol = xtensa_elf_dynamic_symbol_p (h, info);
8360 if ((r_type == R_XTENSA_32 || r_type == R_XTENSA_PLT)
8361 && (input_section->flags & SEC_ALLOC) != 0
8362 && (dynamic_symbol || info->shared))
8365 const char *srel_name;
8367 bfd_boolean is_plt = FALSE;
8369 dynobj = elf_hash_table (info)->dynobj;
8370 BFD_ASSERT (dynobj != NULL);
8372 if (dynamic_symbol && r_type == R_XTENSA_PLT)
8374 srel_name = ".rela.plt";
8378 srel_name = ".rela.got";
8380 /* Reduce size of the .rela.* section by one reloc. */
8381 srel = bfd_get_section_by_name (dynobj, srel_name);
8382 BFD_ASSERT (srel != NULL);
8383 BFD_ASSERT (srel->size >= sizeof (Elf32_External_Rela));
8384 srel->size -= sizeof (Elf32_External_Rela);
8388 asection *splt, *sgotplt, *srelgot;
8389 int reloc_index, chunk;
8391 /* Find the PLT reloc index of the entry being removed. This
8392 is computed from the size of ".rela.plt". It is needed to
8393 figure out which PLT chunk to resize. Usually "last index
8394 = size - 1" since the index starts at zero, but in this
8395 context, the size has just been decremented so there's no
8396 need to subtract one. */
8397 reloc_index = srel->size / sizeof (Elf32_External_Rela);
8399 chunk = reloc_index / PLT_ENTRIES_PER_CHUNK;
8400 splt = elf_xtensa_get_plt_section (dynobj, chunk);
8401 sgotplt = elf_xtensa_get_gotplt_section (dynobj, chunk);
8402 BFD_ASSERT (splt != NULL && sgotplt != NULL);
8404 /* Check if an entire PLT chunk has just been eliminated. */
8405 if (reloc_index % PLT_ENTRIES_PER_CHUNK == 0)
8407 /* The two magic GOT entries for that chunk can go away. */
8408 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
8409 BFD_ASSERT (srelgot != NULL);
8410 srelgot->reloc_count -= 2;
8411 srelgot->size -= 2 * sizeof (Elf32_External_Rela);
8414 /* There should be only one entry left (and it will be
8416 BFD_ASSERT (sgotplt->size == 4);
8417 BFD_ASSERT (splt->size == PLT_ENTRY_SIZE);
8420 BFD_ASSERT (sgotplt->size >= 4);
8421 BFD_ASSERT (splt->size >= PLT_ENTRY_SIZE);
8424 splt->size -= PLT_ENTRY_SIZE;
8430 /* Take an r_rel and move it to another section. This usually
8431 requires extending the interal_relocation array and pinning it. If
8432 the original r_rel is from the same BFD, we can complete this here.
8433 Otherwise, we add a fix record to let the final link fix the
8434 appropriate address. Contents and internal relocations for the
8435 section must be pinned after calling this routine. */
8438 move_literal (bfd *abfd,
8439 struct bfd_link_info *link_info,
8443 xtensa_relax_info *relax_info,
8444 Elf_Internal_Rela **internal_relocs_p,
8445 const literal_value *lit)
8447 Elf_Internal_Rela *new_relocs = NULL;
8448 size_t new_relocs_count = 0;
8449 Elf_Internal_Rela this_rela;
8450 const r_reloc *r_rel;
8452 r_rel = &lit->r_rel;
8453 BFD_ASSERT (elf_section_data (sec)->relocs == *internal_relocs_p);
8455 if (r_reloc_is_const (r_rel))
8456 bfd_put_32 (abfd, lit->value, contents + offset);
8461 asection *target_sec;
8465 r_type = ELF32_R_TYPE (r_rel->rela.r_info);
8466 target_sec = r_reloc_get_section (r_rel);
8468 /* This is the difficult case. We have to create a fix up. */
8469 this_rela.r_offset = offset;
8470 this_rela.r_info = ELF32_R_INFO (0, r_type);
8471 this_rela.r_addend =
8472 r_rel->target_offset - r_reloc_get_target_offset (r_rel);
8473 bfd_put_32 (abfd, lit->value, contents + offset);
8475 /* Currently, we cannot move relocations during a relocatable link. */
8476 BFD_ASSERT (!link_info->relocatable);
8477 fix = reloc_bfd_fix_init (sec, offset, r_type, r_rel->abfd,
8478 r_reloc_get_section (r_rel),
8479 r_rel->target_offset + r_rel->virtual_offset,
8481 /* We also need to mark that relocations are needed here. */
8482 sec->flags |= SEC_RELOC;
8484 translate_reloc_bfd_fix (fix);
8485 /* This fix has not yet been translated. */
8488 /* Add the relocation. If we have already allocated our own
8489 space for the relocations and we have room for more, then use
8490 it. Otherwise, allocate new space and move the literals. */
8491 insert_at = sec->reloc_count;
8492 for (i = 0; i < sec->reloc_count; ++i)
8494 if (this_rela.r_offset < (*internal_relocs_p)[i].r_offset)
8501 if (*internal_relocs_p != relax_info->allocated_relocs
8502 || sec->reloc_count + 1 > relax_info->allocated_relocs_count)
8504 BFD_ASSERT (relax_info->allocated_relocs == NULL
8505 || sec->reloc_count == relax_info->relocs_count);
8507 if (relax_info->allocated_relocs_count == 0)
8508 new_relocs_count = (sec->reloc_count + 2) * 2;
8510 new_relocs_count = (relax_info->allocated_relocs_count + 2) * 2;
8512 new_relocs = (Elf_Internal_Rela *)
8513 bfd_zmalloc (sizeof (Elf_Internal_Rela) * (new_relocs_count));
8517 /* We could handle this more quickly by finding the split point. */
8519 memcpy (new_relocs, *internal_relocs_p,
8520 insert_at * sizeof (Elf_Internal_Rela));
8522 new_relocs[insert_at] = this_rela;
8524 if (insert_at != sec->reloc_count)
8525 memcpy (new_relocs + insert_at + 1,
8526 (*internal_relocs_p) + insert_at,
8527 (sec->reloc_count - insert_at)
8528 * sizeof (Elf_Internal_Rela));
8530 if (*internal_relocs_p != relax_info->allocated_relocs)
8532 /* The first time we re-allocate, we can only free the
8533 old relocs if they were allocated with bfd_malloc.
8534 This is not true when keep_memory is in effect. */
8535 if (!link_info->keep_memory)
8536 free (*internal_relocs_p);
8539 free (*internal_relocs_p);
8540 relax_info->allocated_relocs = new_relocs;
8541 relax_info->allocated_relocs_count = new_relocs_count;
8542 elf_section_data (sec)->relocs = new_relocs;
8544 relax_info->relocs_count = sec->reloc_count;
8545 *internal_relocs_p = new_relocs;
8549 if (insert_at != sec->reloc_count)
8552 for (idx = sec->reloc_count; idx > insert_at; idx--)
8553 (*internal_relocs_p)[idx] = (*internal_relocs_p)[idx-1];
8555 (*internal_relocs_p)[insert_at] = this_rela;
8557 if (relax_info->allocated_relocs)
8558 relax_info->relocs_count = sec->reloc_count;
8565 /* This is similar to relax_section except that when a target is moved,
8566 we shift addresses up. We also need to modify the size. This
8567 algorithm does NOT allow for relocations into the middle of the
8568 property sections. */
8571 relax_property_section (bfd *abfd,
8573 struct bfd_link_info *link_info)
8575 Elf_Internal_Rela *internal_relocs;
8578 bfd_boolean ok = TRUE;
8579 bfd_boolean is_full_prop_section;
8580 size_t last_zfill_target_offset = 0;
8581 asection *last_zfill_target_sec = NULL;
8582 bfd_size_type sec_size;
8584 sec_size = bfd_get_section_limit (abfd, sec);
8585 internal_relocs = retrieve_internal_relocs (abfd, sec,
8586 link_info->keep_memory);
8587 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
8588 if (contents == NULL && sec_size != 0)
8594 is_full_prop_section =
8595 ((strcmp (sec->name, XTENSA_PROP_SEC_NAME) == 0)
8596 || (strncmp (sec->name, ".gnu.linkonce.prop.",
8597 sizeof ".gnu.linkonce.prop." - 1) == 0));
8599 if (internal_relocs)
8601 for (i = 0; i < sec->reloc_count; i++)
8603 Elf_Internal_Rela *irel;
8604 xtensa_relax_info *target_relax_info;
8606 asection *target_sec;
8608 bfd_byte *size_p, *flags_p;
8610 /* Locally change the source address.
8611 Translate the target to the new target address.
8612 If it points to this section and has been removed, MOVE IT.
8613 Also, don't forget to modify the associated SIZE at
8616 irel = &internal_relocs[i];
8617 r_type = ELF32_R_TYPE (irel->r_info);
8618 if (r_type == R_XTENSA_NONE)
8621 /* Find the literal value. */
8622 r_reloc_init (&val.r_rel, abfd, irel, contents, sec_size);
8623 size_p = &contents[irel->r_offset + 4];
8625 if (is_full_prop_section)
8627 flags_p = &contents[irel->r_offset + 8];
8628 BFD_ASSERT (irel->r_offset + 12 <= sec_size);
8631 BFD_ASSERT (irel->r_offset + 8 <= sec_size);
8633 target_sec = r_reloc_get_section (&val.r_rel);
8634 target_relax_info = get_xtensa_relax_info (target_sec);
8636 if (target_relax_info
8637 && (target_relax_info->is_relaxable_literal_section
8638 || target_relax_info->is_relaxable_asm_section ))
8640 /* Translate the relocation's destination. */
8641 bfd_vma new_offset, new_end_offset;
8642 long old_size, new_size;
8644 new_offset = offset_with_removed_text
8645 (&target_relax_info->action_list, val.r_rel.target_offset);
8647 /* Assert that we are not out of bounds. */
8648 old_size = bfd_get_32 (abfd, size_p);
8652 /* Only the first zero-sized unreachable entry is
8653 allowed to expand. In this case the new offset
8654 should be the offset before the fill and the new
8655 size is the expansion size. For other zero-sized
8656 entries the resulting size should be zero with an
8657 offset before or after the fill address depending
8658 on whether the expanding unreachable entry
8660 if (last_zfill_target_sec
8661 && last_zfill_target_sec == target_sec
8662 && last_zfill_target_offset == val.r_rel.target_offset)
8663 new_end_offset = new_offset;
8666 new_end_offset = new_offset;
8667 new_offset = offset_with_removed_text_before_fill
8668 (&target_relax_info->action_list,
8669 val.r_rel.target_offset);
8671 /* If it is not unreachable and we have not yet
8672 seen an unreachable at this address, place it
8673 before the fill address. */
8675 || (bfd_get_32 (abfd, flags_p)
8676 & XTENSA_PROP_UNREACHABLE) == 0)
8677 new_end_offset = new_offset;
8680 last_zfill_target_sec = target_sec;
8681 last_zfill_target_offset = val.r_rel.target_offset;
8687 new_end_offset = offset_with_removed_text_before_fill
8688 (&target_relax_info->action_list,
8689 val.r_rel.target_offset + old_size);
8692 new_size = new_end_offset - new_offset;
8694 if (new_size != old_size)
8696 bfd_put_32 (abfd, new_size, size_p);
8697 pin_contents (sec, contents);
8700 if (new_offset != val.r_rel.target_offset)
8702 bfd_vma diff = new_offset - val.r_rel.target_offset;
8703 irel->r_addend += diff;
8704 pin_internal_relocs (sec, internal_relocs);
8710 /* Combine adjacent property table entries. This is also done in
8711 finish_dynamic_sections() but at that point it's too late to
8712 reclaim the space in the output section, so we do this twice. */
8714 if (internal_relocs && (!link_info->relocatable
8715 || strcmp (sec->name, XTENSA_LIT_SEC_NAME) == 0))
8717 Elf_Internal_Rela *last_irel = NULL;
8718 int removed_bytes = 0;
8719 bfd_vma offset, last_irel_offset;
8720 bfd_vma section_size;
8721 bfd_size_type entry_size;
8722 flagword predef_flags;
8724 if (is_full_prop_section)
8729 predef_flags = xtensa_get_property_predef_flags (sec);
8731 /* Walk over memory and irels at the same time.
8732 This REQUIRES that the internal_relocs be sorted by offset. */
8733 qsort (internal_relocs, sec->reloc_count, sizeof (Elf_Internal_Rela),
8734 internal_reloc_compare);
8735 nexti = 0; /* Index into internal_relocs. */
8737 pin_internal_relocs (sec, internal_relocs);
8738 pin_contents (sec, contents);
8740 last_irel_offset = (bfd_vma) -1;
8741 section_size = sec->size;
8742 BFD_ASSERT (section_size % entry_size == 0);
8744 for (offset = 0; offset < section_size; offset += entry_size)
8746 Elf_Internal_Rela *irel, *next_irel;
8747 bfd_vma bytes_to_remove, size, actual_offset;
8748 bfd_boolean remove_this_irel;
8754 /* Find the next two relocations (if there are that many left),
8755 skipping over any R_XTENSA_NONE relocs. On entry, "nexti" is
8756 the starting reloc index. After these two loops, "i"
8757 is the index of the first non-NONE reloc past that starting
8758 index, and "nexti" is the index for the next non-NONE reloc
8761 for (i = nexti; i < sec->reloc_count; i++)
8763 if (ELF32_R_TYPE (internal_relocs[i].r_info) != R_XTENSA_NONE)
8765 irel = &internal_relocs[i];
8768 internal_relocs[i].r_offset -= removed_bytes;
8771 for (nexti = i + 1; nexti < sec->reloc_count; nexti++)
8773 if (ELF32_R_TYPE (internal_relocs[nexti].r_info)
8776 next_irel = &internal_relocs[nexti];
8779 internal_relocs[nexti].r_offset -= removed_bytes;
8782 remove_this_irel = FALSE;
8783 bytes_to_remove = 0;
8784 actual_offset = offset - removed_bytes;
8785 size = bfd_get_32 (abfd, &contents[actual_offset + 4]);
8787 if (is_full_prop_section)
8788 flags = bfd_get_32 (abfd, &contents[actual_offset + 8]);
8790 flags = predef_flags;
8792 /* Check that the irels are sorted by offset,
8793 with only one per address. */
8794 BFD_ASSERT (!irel || (int) irel->r_offset > (int) last_irel_offset);
8795 BFD_ASSERT (!next_irel || next_irel->r_offset > irel->r_offset);
8797 /* Make sure there aren't relocs on the size or flag fields. */
8798 if ((irel && irel->r_offset == offset + 4)
8799 || (is_full_prop_section
8800 && irel && irel->r_offset == offset + 8))
8802 irel->r_offset -= removed_bytes;
8803 last_irel_offset = irel->r_offset;
8805 else if (next_irel && (next_irel->r_offset == offset + 4
8806 || (is_full_prop_section
8807 && next_irel->r_offset == offset + 8)))
8810 irel->r_offset -= removed_bytes;
8811 next_irel->r_offset -= removed_bytes;
8812 last_irel_offset = next_irel->r_offset;
8814 else if (size == 0 && (flags & XTENSA_PROP_ALIGN) == 0
8815 && (flags & XTENSA_PROP_UNREACHABLE) == 0)
8817 /* Always remove entries with zero size and no alignment. */
8818 bytes_to_remove = entry_size;
8819 if (irel && irel->r_offset == offset)
8821 remove_this_irel = TRUE;
8823 irel->r_offset -= removed_bytes;
8824 last_irel_offset = irel->r_offset;
8827 else if (irel && irel->r_offset == offset)
8829 if (ELF32_R_TYPE (irel->r_info) == R_XTENSA_32)
8835 bfd_get_32 (abfd, &contents[last_irel->r_offset + 4]);
8836 bfd_vma old_address =
8837 (last_irel->r_addend
8838 + bfd_get_32 (abfd, &contents[last_irel->r_offset]));
8839 bfd_vma new_address =
8841 + bfd_get_32 (abfd, &contents[actual_offset]));
8842 if (is_full_prop_section)
8843 old_flags = bfd_get_32
8844 (abfd, &contents[last_irel->r_offset + 8]);
8846 old_flags = predef_flags;
8848 if ((ELF32_R_SYM (irel->r_info)
8849 == ELF32_R_SYM (last_irel->r_info))
8850 && old_address + old_size == new_address
8851 && old_flags == flags
8852 && (old_flags & XTENSA_PROP_INSN_BRANCH_TARGET) == 0
8853 && (old_flags & XTENSA_PROP_INSN_LOOP_TARGET) == 0)
8855 /* Fix the old size. */
8856 bfd_put_32 (abfd, old_size + size,
8857 &contents[last_irel->r_offset + 4]);
8858 bytes_to_remove = entry_size;
8859 remove_this_irel = TRUE;
8868 irel->r_offset -= removed_bytes;
8869 last_irel_offset = irel->r_offset;
8872 if (remove_this_irel)
8874 irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
8875 irel->r_offset -= bytes_to_remove;
8878 if (bytes_to_remove != 0)
8880 removed_bytes += bytes_to_remove;
8881 if (offset + bytes_to_remove < section_size)
8882 memmove (&contents[actual_offset],
8883 &contents[actual_offset + bytes_to_remove],
8884 section_size - offset - bytes_to_remove);
8890 /* Clear the removed bytes. */
8891 memset (&contents[section_size - removed_bytes], 0, removed_bytes);
8893 sec->size = section_size - removed_bytes;
8895 if (xtensa_is_littable_section (sec))
8897 bfd *dynobj = elf_hash_table (link_info)->dynobj;
8901 bfd_get_section_by_name (dynobj, ".got.loc");
8903 sgotloc->size -= removed_bytes;
8910 release_internal_relocs (sec, internal_relocs);
8911 release_contents (sec, contents);
8916 /* Third relaxation pass. */
8918 /* Change symbol values to account for removed literals. */
8921 relax_section_symbols (bfd *abfd, asection *sec)
8923 xtensa_relax_info *relax_info;
8924 unsigned int sec_shndx;
8925 Elf_Internal_Shdr *symtab_hdr;
8926 Elf_Internal_Sym *isymbuf;
8927 unsigned i, num_syms, num_locals;
8929 relax_info = get_xtensa_relax_info (sec);
8930 BFD_ASSERT (relax_info);
8932 if (!relax_info->is_relaxable_literal_section
8933 && !relax_info->is_relaxable_asm_section)
8936 sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
8938 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
8939 isymbuf = retrieve_local_syms (abfd);
8941 num_syms = symtab_hdr->sh_size / sizeof (Elf32_External_Sym);
8942 num_locals = symtab_hdr->sh_info;
8944 /* Adjust the local symbols defined in this section. */
8945 for (i = 0; i < num_locals; i++)
8947 Elf_Internal_Sym *isym = &isymbuf[i];
8949 if (isym->st_shndx == sec_shndx)
8951 bfd_vma new_address = offset_with_removed_text
8952 (&relax_info->action_list, isym->st_value);
8953 bfd_vma new_size = isym->st_size;
8955 if (ELF32_ST_TYPE (isym->st_info) == STT_FUNC)
8957 bfd_vma new_end = offset_with_removed_text
8958 (&relax_info->action_list, isym->st_value + isym->st_size);
8959 new_size = new_end - new_address;
8962 isym->st_value = new_address;
8963 isym->st_size = new_size;
8967 /* Now adjust the global symbols defined in this section. */
8968 for (i = 0; i < (num_syms - num_locals); i++)
8970 struct elf_link_hash_entry *sym_hash;
8972 sym_hash = elf_sym_hashes (abfd)[i];
8974 if (sym_hash->root.type == bfd_link_hash_warning)
8975 sym_hash = (struct elf_link_hash_entry *) sym_hash->root.u.i.link;
8977 if ((sym_hash->root.type == bfd_link_hash_defined
8978 || sym_hash->root.type == bfd_link_hash_defweak)
8979 && sym_hash->root.u.def.section == sec)
8981 bfd_vma new_address = offset_with_removed_text
8982 (&relax_info->action_list, sym_hash->root.u.def.value);
8983 bfd_vma new_size = sym_hash->size;
8985 if (sym_hash->type == STT_FUNC)
8987 bfd_vma new_end = offset_with_removed_text
8988 (&relax_info->action_list,
8989 sym_hash->root.u.def.value + sym_hash->size);
8990 new_size = new_end - new_address;
8993 sym_hash->root.u.def.value = new_address;
8994 sym_hash->size = new_size;
9002 /* "Fix" handling functions, called while performing relocations. */
9005 do_fix_for_relocatable_link (Elf_Internal_Rela *rel,
9007 asection *input_section,
9011 asection *sec, *old_sec;
9013 int r_type = ELF32_R_TYPE (rel->r_info);
9016 if (r_type == R_XTENSA_NONE)
9019 fix = get_bfd_fix (input_section, rel->r_offset, r_type);
9023 r_reloc_init (&r_rel, input_bfd, rel, contents,
9024 bfd_get_section_limit (input_bfd, input_section));
9025 old_sec = r_reloc_get_section (&r_rel);
9026 old_offset = r_rel.target_offset;
9028 if (!old_sec || !r_reloc_is_defined (&r_rel))
9030 if (r_type != R_XTENSA_ASM_EXPAND)
9032 (*_bfd_error_handler)
9033 (_("%B(%A+0x%lx): unexpected fix for %s relocation"),
9034 input_bfd, input_section, rel->r_offset,
9035 elf_howto_table[r_type].name);
9038 /* Leave it be. Resolution will happen in a later stage. */
9042 sec = fix->target_sec;
9043 rel->r_addend += ((sec->output_offset + fix->target_offset)
9044 - (old_sec->output_offset + old_offset));
9051 do_fix_for_final_link (Elf_Internal_Rela *rel,
9053 asection *input_section,
9055 bfd_vma *relocationp)
9058 int r_type = ELF32_R_TYPE (rel->r_info);
9062 if (r_type == R_XTENSA_NONE)
9065 fix = get_bfd_fix (input_section, rel->r_offset, r_type);
9069 sec = fix->target_sec;
9071 fixup_diff = rel->r_addend;
9072 if (elf_howto_table[fix->src_type].partial_inplace)
9074 bfd_vma inplace_val;
9075 BFD_ASSERT (fix->src_offset
9076 < bfd_get_section_limit (input_bfd, input_section));
9077 inplace_val = bfd_get_32 (input_bfd, &contents[fix->src_offset]);
9078 fixup_diff += inplace_val;
9081 *relocationp = (sec->output_section->vma
9082 + sec->output_offset
9083 + fix->target_offset - fixup_diff);
9087 /* Miscellaneous utility functions.... */
9090 elf_xtensa_get_plt_section (bfd *dynobj, int chunk)
9095 return bfd_get_section_by_name (dynobj, ".plt");
9097 sprintf (plt_name, ".plt.%u", chunk);
9098 return bfd_get_section_by_name (dynobj, plt_name);
9103 elf_xtensa_get_gotplt_section (bfd *dynobj, int chunk)
9108 return bfd_get_section_by_name (dynobj, ".got.plt");
9110 sprintf (got_name, ".got.plt.%u", chunk);
9111 return bfd_get_section_by_name (dynobj, got_name);
9115 /* Get the input section for a given symbol index.
9117 . a section symbol, return the section;
9118 . a common symbol, return the common section;
9119 . an undefined symbol, return the undefined section;
9120 . an indirect symbol, follow the links;
9121 . an absolute value, return the absolute section. */
9124 get_elf_r_symndx_section (bfd *abfd, unsigned long r_symndx)
9126 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
9127 asection *target_sec = NULL;
9128 if (r_symndx < symtab_hdr->sh_info)
9130 Elf_Internal_Sym *isymbuf;
9131 unsigned int section_index;
9133 isymbuf = retrieve_local_syms (abfd);
9134 section_index = isymbuf[r_symndx].st_shndx;
9136 if (section_index == SHN_UNDEF)
9137 target_sec = bfd_und_section_ptr;
9138 else if (section_index > 0 && section_index < SHN_LORESERVE)
9139 target_sec = bfd_section_from_elf_index (abfd, section_index);
9140 else if (section_index == SHN_ABS)
9141 target_sec = bfd_abs_section_ptr;
9142 else if (section_index == SHN_COMMON)
9143 target_sec = bfd_com_section_ptr;
9150 unsigned long indx = r_symndx - symtab_hdr->sh_info;
9151 struct elf_link_hash_entry *h = elf_sym_hashes (abfd)[indx];
9153 while (h->root.type == bfd_link_hash_indirect
9154 || h->root.type == bfd_link_hash_warning)
9155 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9157 switch (h->root.type)
9159 case bfd_link_hash_defined:
9160 case bfd_link_hash_defweak:
9161 target_sec = h->root.u.def.section;
9163 case bfd_link_hash_common:
9164 target_sec = bfd_com_section_ptr;
9166 case bfd_link_hash_undefined:
9167 case bfd_link_hash_undefweak:
9168 target_sec = bfd_und_section_ptr;
9170 default: /* New indirect warning. */
9171 target_sec = bfd_und_section_ptr;
9179 static struct elf_link_hash_entry *
9180 get_elf_r_symndx_hash_entry (bfd *abfd, unsigned long r_symndx)
9183 struct elf_link_hash_entry *h;
9184 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
9186 if (r_symndx < symtab_hdr->sh_info)
9189 indx = r_symndx - symtab_hdr->sh_info;
9190 h = elf_sym_hashes (abfd)[indx];
9191 while (h->root.type == bfd_link_hash_indirect
9192 || h->root.type == bfd_link_hash_warning)
9193 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9198 /* Get the section-relative offset for a symbol number. */
9201 get_elf_r_symndx_offset (bfd *abfd, unsigned long r_symndx)
9203 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
9206 if (r_symndx < symtab_hdr->sh_info)
9208 Elf_Internal_Sym *isymbuf;
9209 isymbuf = retrieve_local_syms (abfd);
9210 offset = isymbuf[r_symndx].st_value;
9214 unsigned long indx = r_symndx - symtab_hdr->sh_info;
9215 struct elf_link_hash_entry *h =
9216 elf_sym_hashes (abfd)[indx];
9218 while (h->root.type == bfd_link_hash_indirect
9219 || h->root.type == bfd_link_hash_warning)
9220 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9221 if (h->root.type == bfd_link_hash_defined
9222 || h->root.type == bfd_link_hash_defweak)
9223 offset = h->root.u.def.value;
9230 is_reloc_sym_weak (bfd *abfd, Elf_Internal_Rela *rel)
9232 unsigned long r_symndx = ELF32_R_SYM (rel->r_info);
9233 struct elf_link_hash_entry *h;
9235 h = get_elf_r_symndx_hash_entry (abfd, r_symndx);
9236 if (h && h->root.type == bfd_link_hash_defweak)
9243 pcrel_reloc_fits (xtensa_opcode opc,
9245 bfd_vma self_address,
9246 bfd_vma dest_address)
9248 xtensa_isa isa = xtensa_default_isa;
9249 uint32 valp = dest_address;
9250 if (xtensa_operand_do_reloc (isa, opc, opnd, &valp, self_address)
9251 || xtensa_operand_encode (isa, opc, opnd, &valp))
9257 static int linkonce_len = sizeof (".gnu.linkonce.") - 1;
9258 static int insn_sec_len = sizeof (XTENSA_INSN_SEC_NAME) - 1;
9259 static int lit_sec_len = sizeof (XTENSA_LIT_SEC_NAME) - 1;
9260 static int prop_sec_len = sizeof (XTENSA_PROP_SEC_NAME) - 1;
9264 xtensa_is_property_section (asection *sec)
9266 if (strncmp (XTENSA_INSN_SEC_NAME, sec->name, insn_sec_len) == 0
9267 || strncmp (XTENSA_LIT_SEC_NAME, sec->name, lit_sec_len) == 0
9268 || strncmp (XTENSA_PROP_SEC_NAME, sec->name, prop_sec_len) == 0)
9271 if (strncmp (".gnu.linkonce.", sec->name, linkonce_len) == 0
9272 && (strncmp (&sec->name[linkonce_len], "x.", 2) == 0
9273 || strncmp (&sec->name[linkonce_len], "p.", 2) == 0
9274 || strncmp (&sec->name[linkonce_len], "prop.", 5) == 0))
9282 xtensa_is_littable_section (asection *sec)
9284 if (strncmp (XTENSA_LIT_SEC_NAME, sec->name, lit_sec_len) == 0)
9287 if (strncmp (".gnu.linkonce.", sec->name, linkonce_len) == 0
9288 && sec->name[linkonce_len] == 'p'
9289 && sec->name[linkonce_len + 1] == '.')
9297 internal_reloc_compare (const void *ap, const void *bp)
9299 const Elf_Internal_Rela *a = (const Elf_Internal_Rela *) ap;
9300 const Elf_Internal_Rela *b = (const Elf_Internal_Rela *) bp;
9302 if (a->r_offset != b->r_offset)
9303 return (a->r_offset - b->r_offset);
9305 /* We don't need to sort on these criteria for correctness,
9306 but enforcing a more strict ordering prevents unstable qsort
9307 from behaving differently with different implementations.
9308 Without the code below we get correct but different results
9309 on Solaris 2.7 and 2.8. We would like to always produce the
9310 same results no matter the host. */
9312 if (a->r_info != b->r_info)
9313 return (a->r_info - b->r_info);
9315 return (a->r_addend - b->r_addend);
9320 internal_reloc_matches (const void *ap, const void *bp)
9322 const Elf_Internal_Rela *a = (const Elf_Internal_Rela *) ap;
9323 const Elf_Internal_Rela *b = (const Elf_Internal_Rela *) bp;
9325 /* Check if one entry overlaps with the other; this shouldn't happen
9326 except when searching for a match. */
9327 return (a->r_offset - b->r_offset);
9332 xtensa_get_property_section_name (asection *sec, const char *base_name)
9334 if (strncmp (sec->name, ".gnu.linkonce.", linkonce_len) == 0)
9336 char *prop_sec_name;
9338 char *linkonce_kind = 0;
9340 if (strcmp (base_name, XTENSA_INSN_SEC_NAME) == 0)
9341 linkonce_kind = "x";
9342 else if (strcmp (base_name, XTENSA_LIT_SEC_NAME) == 0)
9343 linkonce_kind = "p";
9344 else if (strcmp (base_name, XTENSA_PROP_SEC_NAME) == 0)
9345 linkonce_kind = "prop.";
9349 prop_sec_name = (char *) bfd_malloc (strlen (sec->name)
9350 + strlen (linkonce_kind) + 1);
9351 memcpy (prop_sec_name, ".gnu.linkonce.", linkonce_len);
9352 strcpy (prop_sec_name + linkonce_len, linkonce_kind);
9354 suffix = sec->name + linkonce_len;
9355 /* For backward compatibility, replace "t." instead of inserting
9356 the new linkonce_kind (but not for "prop" sections). */
9357 if (strncmp (suffix, "t.", 2) == 0 && linkonce_kind[1] == '.')
9359 strcat (prop_sec_name + linkonce_len, suffix);
9361 return prop_sec_name;
9364 return strdup (base_name);
9369 xtensa_get_property_predef_flags (asection *sec)
9371 if (strcmp (sec->name, XTENSA_INSN_SEC_NAME) == 0
9372 || strncmp (sec->name, ".gnu.linkonce.x.",
9373 sizeof ".gnu.linkonce.x." - 1) == 0)
9374 return (XTENSA_PROP_INSN
9375 | XTENSA_PROP_INSN_NO_TRANSFORM
9376 | XTENSA_PROP_INSN_NO_REORDER);
9378 if (xtensa_is_littable_section (sec))
9379 return (XTENSA_PROP_LITERAL
9380 | XTENSA_PROP_INSN_NO_TRANSFORM
9381 | XTENSA_PROP_INSN_NO_REORDER);
9387 /* Other functions called directly by the linker. */
9390 xtensa_callback_required_dependence (bfd *abfd,
9392 struct bfd_link_info *link_info,
9393 deps_callback_t callback,
9396 Elf_Internal_Rela *internal_relocs;
9399 bfd_boolean ok = TRUE;
9400 bfd_size_type sec_size;
9402 sec_size = bfd_get_section_limit (abfd, sec);
9404 /* ".plt*" sections have no explicit relocations but they contain L32R
9405 instructions that reference the corresponding ".got.plt*" sections. */
9406 if ((sec->flags & SEC_LINKER_CREATED) != 0
9407 && strncmp (sec->name, ".plt", 4) == 0)
9411 /* Find the corresponding ".got.plt*" section. */
9412 if (sec->name[4] == '\0')
9413 sgotplt = bfd_get_section_by_name (sec->owner, ".got.plt");
9419 BFD_ASSERT (sec->name[4] == '.');
9420 chunk = strtol (&sec->name[5], NULL, 10);
9422 sprintf (got_name, ".got.plt.%u", chunk);
9423 sgotplt = bfd_get_section_by_name (sec->owner, got_name);
9425 BFD_ASSERT (sgotplt);
9427 /* Assume worst-case offsets: L32R at the very end of the ".plt"
9428 section referencing a literal at the very beginning of
9429 ".got.plt". This is very close to the real dependence, anyway. */
9430 (*callback) (sec, sec_size, sgotplt, 0, closure);
9433 internal_relocs = retrieve_internal_relocs (abfd, sec,
9434 link_info->keep_memory);
9435 if (internal_relocs == NULL
9436 || sec->reloc_count == 0)
9439 /* Cache the contents for the duration of this scan. */
9440 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
9441 if (contents == NULL && sec_size != 0)
9447 if (!xtensa_default_isa)
9448 xtensa_default_isa = xtensa_isa_init (0, 0);
9450 for (i = 0; i < sec->reloc_count; i++)
9452 Elf_Internal_Rela *irel = &internal_relocs[i];
9453 if (is_l32r_relocation (abfd, sec, contents, irel))
9456 asection *target_sec;
9457 bfd_vma target_offset;
9459 r_reloc_init (&l32r_rel, abfd, irel, contents, sec_size);
9462 /* L32Rs must be local to the input file. */
9463 if (r_reloc_is_defined (&l32r_rel))
9465 target_sec = r_reloc_get_section (&l32r_rel);
9466 target_offset = l32r_rel.target_offset;
9468 (*callback) (sec, irel->r_offset, target_sec, target_offset,
9474 release_internal_relocs (sec, internal_relocs);
9475 release_contents (sec, contents);
9479 /* The default literal sections should always be marked as "code" (i.e.,
9480 SHF_EXECINSTR). This is particularly important for the Linux kernel
9481 module loader so that the literals are not placed after the text. */
9482 static struct bfd_elf_special_section const elf_xtensa_special_sections[]=
9484 { ".literal", 8, 0, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR },
9485 { ".init.literal", 13, 0, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR },
9486 { ".fini.literal", 13, 0, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR },
9487 { NULL, 0, 0, 0, 0 }
9492 #define TARGET_LITTLE_SYM bfd_elf32_xtensa_le_vec
9493 #define TARGET_LITTLE_NAME "elf32-xtensa-le"
9494 #define TARGET_BIG_SYM bfd_elf32_xtensa_be_vec
9495 #define TARGET_BIG_NAME "elf32-xtensa-be"
9496 #define ELF_ARCH bfd_arch_xtensa
9498 /* The new EM_XTENSA value will be recognized beginning in the Xtensa T1040
9499 release. However, we still have to generate files with the EM_XTENSA_OLD
9500 value so that pre-T1040 tools can read the files. As soon as we stop
9501 caring about pre-T1040 tools, the following two values should be
9502 swapped. At the same time, any other code that uses EM_XTENSA_OLD
9503 should be changed to use EM_XTENSA. */
9504 #define ELF_MACHINE_CODE EM_XTENSA_OLD
9505 #define ELF_MACHINE_ALT1 EM_XTENSA
9508 #define ELF_MAXPAGESIZE (1 << XCHAL_MMU_MIN_PTE_PAGE_SIZE)
9509 #else /* !XCHAL_HAVE_MMU */
9510 #define ELF_MAXPAGESIZE 1
9511 #endif /* !XCHAL_HAVE_MMU */
9512 #endif /* ELF_ARCH */
9514 #define elf_backend_can_gc_sections 1
9515 #define elf_backend_can_refcount 1
9516 #define elf_backend_plt_readonly 1
9517 #define elf_backend_got_header_size 4
9518 #define elf_backend_want_dynbss 0
9519 #define elf_backend_want_got_plt 1
9521 #define elf_info_to_howto elf_xtensa_info_to_howto_rela
9523 #define bfd_elf32_bfd_merge_private_bfd_data elf_xtensa_merge_private_bfd_data
9524 #define bfd_elf32_new_section_hook elf_xtensa_new_section_hook
9525 #define bfd_elf32_bfd_print_private_bfd_data elf_xtensa_print_private_bfd_data
9526 #define bfd_elf32_bfd_relax_section elf_xtensa_relax_section
9527 #define bfd_elf32_bfd_reloc_type_lookup elf_xtensa_reloc_type_lookup
9528 #define bfd_elf32_bfd_set_private_flags elf_xtensa_set_private_flags
9530 #define elf_backend_adjust_dynamic_symbol elf_xtensa_adjust_dynamic_symbol
9531 #define elf_backend_check_relocs elf_xtensa_check_relocs
9532 #define elf_backend_create_dynamic_sections elf_xtensa_create_dynamic_sections
9533 #define elf_backend_discard_info elf_xtensa_discard_info
9534 #define elf_backend_ignore_discarded_relocs elf_xtensa_ignore_discarded_relocs
9535 #define elf_backend_final_write_processing elf_xtensa_final_write_processing
9536 #define elf_backend_finish_dynamic_sections elf_xtensa_finish_dynamic_sections
9537 #define elf_backend_finish_dynamic_symbol elf_xtensa_finish_dynamic_symbol
9538 #define elf_backend_gc_mark_hook elf_xtensa_gc_mark_hook
9539 #define elf_backend_gc_sweep_hook elf_xtensa_gc_sweep_hook
9540 #define elf_backend_grok_prstatus elf_xtensa_grok_prstatus
9541 #define elf_backend_grok_psinfo elf_xtensa_grok_psinfo
9542 #define elf_backend_hide_symbol elf_xtensa_hide_symbol
9543 #define elf_backend_modify_segment_map elf_xtensa_modify_segment_map
9544 #define elf_backend_object_p elf_xtensa_object_p
9545 #define elf_backend_reloc_type_class elf_xtensa_reloc_type_class
9546 #define elf_backend_relocate_section elf_xtensa_relocate_section
9547 #define elf_backend_size_dynamic_sections elf_xtensa_size_dynamic_sections
9548 #define elf_backend_special_sections elf_xtensa_special_sections
9550 #include "elf32-target.h"