2005-08-24 H.J. Lu <hongjiu.lu@intel.com>
[deliverable/binutils-gdb.git] / bfd / elf32-xtensa.c
1 /* Xtensa-specific support for 32-bit ELF.
2 Copyright 2003, 2004, 2005 Free Software Foundation, Inc.
3
4 This file is part of BFD, the Binary File Descriptor library.
5
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.
10
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.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
19 02110-1301, USA. */
20
21 #include "bfd.h"
22 #include "sysdep.h"
23
24 #include <stdarg.h>
25 #include <strings.h>
26
27 #include "bfdlink.h"
28 #include "libbfd.h"
29 #include "elf-bfd.h"
30 #include "elf/xtensa.h"
31 #include "xtensa-isa.h"
32 #include "xtensa-config.h"
33
34 #define XTENSA_NO_NOP_REMOVAL 0
35
36 /* Local helper functions. */
37
38 static bfd_boolean add_extra_plt_sections (bfd *, int);
39 static char *vsprint_msg (const char *, const char *, int, ...) ATTRIBUTE_PRINTF(2,4);
40 static bfd_reloc_status_type bfd_elf_xtensa_reloc
41 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
42 static bfd_boolean do_fix_for_relocatable_link
43 (Elf_Internal_Rela *, bfd *, asection *, bfd_byte *);
44 static void do_fix_for_final_link
45 (Elf_Internal_Rela *, bfd *, asection *, bfd_byte *, bfd_vma *);
46
47 /* Local functions to handle Xtensa configurability. */
48
49 static bfd_boolean is_indirect_call_opcode (xtensa_opcode);
50 static bfd_boolean is_direct_call_opcode (xtensa_opcode);
51 static bfd_boolean is_windowed_call_opcode (xtensa_opcode);
52 static xtensa_opcode get_const16_opcode (void);
53 static xtensa_opcode get_l32r_opcode (void);
54 static bfd_vma l32r_offset (bfd_vma, bfd_vma);
55 static int get_relocation_opnd (xtensa_opcode, int);
56 static int get_relocation_slot (int);
57 static xtensa_opcode get_relocation_opcode
58 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *);
59 static bfd_boolean is_l32r_relocation
60 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *);
61 static bfd_boolean is_alt_relocation (int);
62 static bfd_boolean is_operand_relocation (int);
63 static bfd_size_type insn_decode_len
64 (bfd_byte *, bfd_size_type, bfd_size_type);
65 static xtensa_opcode insn_decode_opcode
66 (bfd_byte *, bfd_size_type, bfd_size_type, int);
67 static bfd_boolean check_branch_target_aligned
68 (bfd_byte *, bfd_size_type, bfd_vma, bfd_vma);
69 static bfd_boolean check_loop_aligned
70 (bfd_byte *, bfd_size_type, bfd_vma, bfd_vma);
71 static bfd_boolean check_branch_target_aligned_address (bfd_vma, int);
72 static bfd_size_type get_asm_simplify_size
73 (bfd_byte *, bfd_size_type, bfd_size_type);
74
75 /* Functions for link-time code simplifications. */
76
77 static bfd_reloc_status_type elf_xtensa_do_asm_simplify
78 (bfd_byte *, bfd_vma, bfd_vma, char **);
79 static bfd_reloc_status_type contract_asm_expansion
80 (bfd_byte *, bfd_vma, Elf_Internal_Rela *, char **);
81 static xtensa_opcode swap_callx_for_call_opcode (xtensa_opcode);
82 static xtensa_opcode get_expanded_call_opcode (bfd_byte *, int, bfd_boolean *);
83
84 /* Access to internal relocations, section contents and symbols. */
85
86 static Elf_Internal_Rela *retrieve_internal_relocs
87 (bfd *, asection *, bfd_boolean);
88 static void pin_internal_relocs (asection *, Elf_Internal_Rela *);
89 static void release_internal_relocs (asection *, Elf_Internal_Rela *);
90 static bfd_byte *retrieve_contents (bfd *, asection *, bfd_boolean);
91 static void pin_contents (asection *, bfd_byte *);
92 static void release_contents (asection *, bfd_byte *);
93 static Elf_Internal_Sym *retrieve_local_syms (bfd *);
94
95 /* Miscellaneous utility functions. */
96
97 static asection *elf_xtensa_get_plt_section (bfd *, int);
98 static asection *elf_xtensa_get_gotplt_section (bfd *, int);
99 static asection *get_elf_r_symndx_section (bfd *, unsigned long);
100 static struct elf_link_hash_entry *get_elf_r_symndx_hash_entry
101 (bfd *, unsigned long);
102 static bfd_vma get_elf_r_symndx_offset (bfd *, unsigned long);
103 static bfd_boolean is_reloc_sym_weak (bfd *, Elf_Internal_Rela *);
104 static bfd_boolean pcrel_reloc_fits (xtensa_opcode, int, bfd_vma, bfd_vma);
105 static bfd_boolean xtensa_is_property_section (asection *);
106 static bfd_boolean xtensa_is_littable_section (asection *);
107 static int internal_reloc_compare (const void *, const void *);
108 static int internal_reloc_matches (const void *, const void *);
109 extern char *xtensa_get_property_section_name (asection *, const char *);
110 static flagword xtensa_get_property_predef_flags (asection *);
111
112 /* Other functions called directly by the linker. */
113
114 typedef void (*deps_callback_t)
115 (asection *, bfd_vma, asection *, bfd_vma, void *);
116 extern bfd_boolean xtensa_callback_required_dependence
117 (bfd *, asection *, struct bfd_link_info *, deps_callback_t, void *);
118
119
120 /* Globally visible flag for choosing size optimization of NOP removal
121 instead of branch-target-aware minimization for NOP removal.
122 When nonzero, narrow all instructions and remove all NOPs possible
123 around longcall expansions. */
124
125 int elf32xtensa_size_opt;
126
127
128 /* The "new_section_hook" is used to set up a per-section
129 "xtensa_relax_info" data structure with additional information used
130 during relaxation. */
131
132 typedef struct xtensa_relax_info_struct xtensa_relax_info;
133
134
135 /* Total count of PLT relocations seen during check_relocs.
136 The actual PLT code must be split into multiple sections and all
137 the sections have to be created before size_dynamic_sections,
138 where we figure out the exact number of PLT entries that will be
139 needed. It is OK if this count is an overestimate, e.g., some
140 relocations may be removed by GC. */
141
142 static int plt_reloc_count = 0;
143
144
145 /* The GNU tools do not easily allow extending interfaces to pass around
146 the pointer to the Xtensa ISA information, so instead we add a global
147 variable here (in BFD) that can be used by any of the tools that need
148 this information. */
149
150 xtensa_isa xtensa_default_isa;
151
152
153 /* When this is true, relocations may have been modified to refer to
154 symbols from other input files. The per-section list of "fix"
155 records needs to be checked when resolving relocations. */
156
157 static bfd_boolean relaxing_section = FALSE;
158
159 /* When this is true, during final links, literals that cannot be
160 coalesced and their relocations may be moved to other sections. */
161
162 int elf32xtensa_no_literal_movement = 1;
163
164 \f
165 static reloc_howto_type elf_howto_table[] =
166 {
167 HOWTO (R_XTENSA_NONE, 0, 0, 0, FALSE, 0, complain_overflow_dont,
168 bfd_elf_xtensa_reloc, "R_XTENSA_NONE",
169 FALSE, 0x00000000, 0x00000000, FALSE),
170 HOWTO (R_XTENSA_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
171 bfd_elf_xtensa_reloc, "R_XTENSA_32",
172 TRUE, 0xffffffff, 0xffffffff, FALSE),
173 /* Replace a 32-bit value with a value from the runtime linker (only
174 used by linker-generated stub functions). The r_addend value is
175 special: 1 means to substitute a pointer to the runtime linker's
176 dynamic resolver function; 2 means to substitute the link map for
177 the shared object. */
178 HOWTO (R_XTENSA_RTLD, 0, 2, 32, FALSE, 0, complain_overflow_dont,
179 NULL, "R_XTENSA_RTLD",
180 FALSE, 0x00000000, 0x00000000, FALSE),
181 HOWTO (R_XTENSA_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
182 bfd_elf_generic_reloc, "R_XTENSA_GLOB_DAT",
183 FALSE, 0xffffffff, 0xffffffff, FALSE),
184 HOWTO (R_XTENSA_JMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
185 bfd_elf_generic_reloc, "R_XTENSA_JMP_SLOT",
186 FALSE, 0xffffffff, 0xffffffff, FALSE),
187 HOWTO (R_XTENSA_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
188 bfd_elf_generic_reloc, "R_XTENSA_RELATIVE",
189 FALSE, 0xffffffff, 0xffffffff, FALSE),
190 HOWTO (R_XTENSA_PLT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
191 bfd_elf_xtensa_reloc, "R_XTENSA_PLT",
192 FALSE, 0xffffffff, 0xffffffff, FALSE),
193 EMPTY_HOWTO (7),
194 HOWTO (R_XTENSA_OP0, 0, 0, 0, TRUE, 0, complain_overflow_dont,
195 bfd_elf_xtensa_reloc, "R_XTENSA_OP0",
196 FALSE, 0x00000000, 0x00000000, TRUE),
197 HOWTO (R_XTENSA_OP1, 0, 0, 0, TRUE, 0, complain_overflow_dont,
198 bfd_elf_xtensa_reloc, "R_XTENSA_OP1",
199 FALSE, 0x00000000, 0x00000000, TRUE),
200 HOWTO (R_XTENSA_OP2, 0, 0, 0, TRUE, 0, complain_overflow_dont,
201 bfd_elf_xtensa_reloc, "R_XTENSA_OP2",
202 FALSE, 0x00000000, 0x00000000, TRUE),
203 /* Assembly auto-expansion. */
204 HOWTO (R_XTENSA_ASM_EXPAND, 0, 0, 0, TRUE, 0, complain_overflow_dont,
205 bfd_elf_xtensa_reloc, "R_XTENSA_ASM_EXPAND",
206 FALSE, 0x00000000, 0x00000000, FALSE),
207 /* Relax assembly auto-expansion. */
208 HOWTO (R_XTENSA_ASM_SIMPLIFY, 0, 0, 0, TRUE, 0, complain_overflow_dont,
209 bfd_elf_xtensa_reloc, "R_XTENSA_ASM_SIMPLIFY",
210 FALSE, 0x00000000, 0x00000000, TRUE),
211 EMPTY_HOWTO (13),
212 EMPTY_HOWTO (14),
213 /* GNU extension to record C++ vtable hierarchy. */
214 HOWTO (R_XTENSA_GNU_VTINHERIT, 0, 2, 0, FALSE, 0, complain_overflow_dont,
215 NULL, "R_XTENSA_GNU_VTINHERIT",
216 FALSE, 0x00000000, 0x00000000, FALSE),
217 /* GNU extension to record C++ vtable member usage. */
218 HOWTO (R_XTENSA_GNU_VTENTRY, 0, 2, 0, FALSE, 0, complain_overflow_dont,
219 _bfd_elf_rel_vtable_reloc_fn, "R_XTENSA_GNU_VTENTRY",
220 FALSE, 0x00000000, 0x00000000, FALSE),
221
222 /* Relocations for supporting difference of symbols. */
223 HOWTO (R_XTENSA_DIFF8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
224 bfd_elf_xtensa_reloc, "R_XTENSA_DIFF8",
225 FALSE, 0xffffffff, 0xffffffff, FALSE),
226 HOWTO (R_XTENSA_DIFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
227 bfd_elf_xtensa_reloc, "R_XTENSA_DIFF16",
228 FALSE, 0xffffffff, 0xffffffff, FALSE),
229 HOWTO (R_XTENSA_DIFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
230 bfd_elf_xtensa_reloc, "R_XTENSA_DIFF32",
231 FALSE, 0xffffffff, 0xffffffff, FALSE),
232
233 /* General immediate operand relocations. */
234 HOWTO (R_XTENSA_SLOT0_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
235 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT0_OP",
236 FALSE, 0x00000000, 0x00000000, TRUE),
237 HOWTO (R_XTENSA_SLOT1_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
238 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT1_OP",
239 FALSE, 0x00000000, 0x00000000, TRUE),
240 HOWTO (R_XTENSA_SLOT2_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
241 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT2_OP",
242 FALSE, 0x00000000, 0x00000000, TRUE),
243 HOWTO (R_XTENSA_SLOT3_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
244 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT3_OP",
245 FALSE, 0x00000000, 0x00000000, TRUE),
246 HOWTO (R_XTENSA_SLOT4_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
247 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT4_OP",
248 FALSE, 0x00000000, 0x00000000, TRUE),
249 HOWTO (R_XTENSA_SLOT5_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
250 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT5_OP",
251 FALSE, 0x00000000, 0x00000000, TRUE),
252 HOWTO (R_XTENSA_SLOT6_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
253 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT6_OP",
254 FALSE, 0x00000000, 0x00000000, TRUE),
255 HOWTO (R_XTENSA_SLOT7_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
256 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT7_OP",
257 FALSE, 0x00000000, 0x00000000, TRUE),
258 HOWTO (R_XTENSA_SLOT8_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
259 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT8_OP",
260 FALSE, 0x00000000, 0x00000000, TRUE),
261 HOWTO (R_XTENSA_SLOT9_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
262 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT9_OP",
263 FALSE, 0x00000000, 0x00000000, TRUE),
264 HOWTO (R_XTENSA_SLOT10_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
265 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT10_OP",
266 FALSE, 0x00000000, 0x00000000, TRUE),
267 HOWTO (R_XTENSA_SLOT11_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
268 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT11_OP",
269 FALSE, 0x00000000, 0x00000000, TRUE),
270 HOWTO (R_XTENSA_SLOT12_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
271 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT12_OP",
272 FALSE, 0x00000000, 0x00000000, TRUE),
273 HOWTO (R_XTENSA_SLOT13_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
274 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT13_OP",
275 FALSE, 0x00000000, 0x00000000, TRUE),
276 HOWTO (R_XTENSA_SLOT14_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
277 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT14_OP",
278 FALSE, 0x00000000, 0x00000000, TRUE),
279
280 /* "Alternate" relocations. The meaning of these is opcode-specific. */
281 HOWTO (R_XTENSA_SLOT0_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
282 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT0_ALT",
283 FALSE, 0x00000000, 0x00000000, TRUE),
284 HOWTO (R_XTENSA_SLOT1_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
285 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT1_ALT",
286 FALSE, 0x00000000, 0x00000000, TRUE),
287 HOWTO (R_XTENSA_SLOT2_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
288 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT2_ALT",
289 FALSE, 0x00000000, 0x00000000, TRUE),
290 HOWTO (R_XTENSA_SLOT3_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
291 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT3_ALT",
292 FALSE, 0x00000000, 0x00000000, TRUE),
293 HOWTO (R_XTENSA_SLOT4_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
294 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT4_ALT",
295 FALSE, 0x00000000, 0x00000000, TRUE),
296 HOWTO (R_XTENSA_SLOT5_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
297 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT5_ALT",
298 FALSE, 0x00000000, 0x00000000, TRUE),
299 HOWTO (R_XTENSA_SLOT6_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
300 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT6_ALT",
301 FALSE, 0x00000000, 0x00000000, TRUE),
302 HOWTO (R_XTENSA_SLOT7_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
303 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT7_ALT",
304 FALSE, 0x00000000, 0x00000000, TRUE),
305 HOWTO (R_XTENSA_SLOT8_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
306 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT8_ALT",
307 FALSE, 0x00000000, 0x00000000, TRUE),
308 HOWTO (R_XTENSA_SLOT9_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
309 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT9_ALT",
310 FALSE, 0x00000000, 0x00000000, TRUE),
311 HOWTO (R_XTENSA_SLOT10_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
312 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT10_ALT",
313 FALSE, 0x00000000, 0x00000000, TRUE),
314 HOWTO (R_XTENSA_SLOT11_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
315 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT11_ALT",
316 FALSE, 0x00000000, 0x00000000, TRUE),
317 HOWTO (R_XTENSA_SLOT12_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
318 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT12_ALT",
319 FALSE, 0x00000000, 0x00000000, TRUE),
320 HOWTO (R_XTENSA_SLOT13_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
321 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT13_ALT",
322 FALSE, 0x00000000, 0x00000000, TRUE),
323 HOWTO (R_XTENSA_SLOT14_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
324 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT14_ALT",
325 FALSE, 0x00000000, 0x00000000, TRUE)
326 };
327
328 #if DEBUG_GEN_RELOC
329 #define TRACE(str) \
330 fprintf (stderr, "Xtensa bfd reloc lookup %d (%s)\n", code, str)
331 #else
332 #define TRACE(str)
333 #endif
334
335 static reloc_howto_type *
336 elf_xtensa_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
337 bfd_reloc_code_real_type code)
338 {
339 switch (code)
340 {
341 case BFD_RELOC_NONE:
342 TRACE ("BFD_RELOC_NONE");
343 return &elf_howto_table[(unsigned) R_XTENSA_NONE ];
344
345 case BFD_RELOC_32:
346 TRACE ("BFD_RELOC_32");
347 return &elf_howto_table[(unsigned) R_XTENSA_32 ];
348
349 case BFD_RELOC_XTENSA_DIFF8:
350 TRACE ("BFD_RELOC_XTENSA_DIFF8");
351 return &elf_howto_table[(unsigned) R_XTENSA_DIFF8 ];
352
353 case BFD_RELOC_XTENSA_DIFF16:
354 TRACE ("BFD_RELOC_XTENSA_DIFF16");
355 return &elf_howto_table[(unsigned) R_XTENSA_DIFF16 ];
356
357 case BFD_RELOC_XTENSA_DIFF32:
358 TRACE ("BFD_RELOC_XTENSA_DIFF32");
359 return &elf_howto_table[(unsigned) R_XTENSA_DIFF32 ];
360
361 case BFD_RELOC_XTENSA_RTLD:
362 TRACE ("BFD_RELOC_XTENSA_RTLD");
363 return &elf_howto_table[(unsigned) R_XTENSA_RTLD ];
364
365 case BFD_RELOC_XTENSA_GLOB_DAT:
366 TRACE ("BFD_RELOC_XTENSA_GLOB_DAT");
367 return &elf_howto_table[(unsigned) R_XTENSA_GLOB_DAT ];
368
369 case BFD_RELOC_XTENSA_JMP_SLOT:
370 TRACE ("BFD_RELOC_XTENSA_JMP_SLOT");
371 return &elf_howto_table[(unsigned) R_XTENSA_JMP_SLOT ];
372
373 case BFD_RELOC_XTENSA_RELATIVE:
374 TRACE ("BFD_RELOC_XTENSA_RELATIVE");
375 return &elf_howto_table[(unsigned) R_XTENSA_RELATIVE ];
376
377 case BFD_RELOC_XTENSA_PLT:
378 TRACE ("BFD_RELOC_XTENSA_PLT");
379 return &elf_howto_table[(unsigned) R_XTENSA_PLT ];
380
381 case BFD_RELOC_XTENSA_OP0:
382 TRACE ("BFD_RELOC_XTENSA_OP0");
383 return &elf_howto_table[(unsigned) R_XTENSA_OP0 ];
384
385 case BFD_RELOC_XTENSA_OP1:
386 TRACE ("BFD_RELOC_XTENSA_OP1");
387 return &elf_howto_table[(unsigned) R_XTENSA_OP1 ];
388
389 case BFD_RELOC_XTENSA_OP2:
390 TRACE ("BFD_RELOC_XTENSA_OP2");
391 return &elf_howto_table[(unsigned) R_XTENSA_OP2 ];
392
393 case BFD_RELOC_XTENSA_ASM_EXPAND:
394 TRACE ("BFD_RELOC_XTENSA_ASM_EXPAND");
395 return &elf_howto_table[(unsigned) R_XTENSA_ASM_EXPAND ];
396
397 case BFD_RELOC_XTENSA_ASM_SIMPLIFY:
398 TRACE ("BFD_RELOC_XTENSA_ASM_SIMPLIFY");
399 return &elf_howto_table[(unsigned) R_XTENSA_ASM_SIMPLIFY ];
400
401 case BFD_RELOC_VTABLE_INHERIT:
402 TRACE ("BFD_RELOC_VTABLE_INHERIT");
403 return &elf_howto_table[(unsigned) R_XTENSA_GNU_VTINHERIT ];
404
405 case BFD_RELOC_VTABLE_ENTRY:
406 TRACE ("BFD_RELOC_VTABLE_ENTRY");
407 return &elf_howto_table[(unsigned) R_XTENSA_GNU_VTENTRY ];
408
409 default:
410 if (code >= BFD_RELOC_XTENSA_SLOT0_OP
411 && code <= BFD_RELOC_XTENSA_SLOT14_OP)
412 {
413 unsigned n = (R_XTENSA_SLOT0_OP +
414 (code - BFD_RELOC_XTENSA_SLOT0_OP));
415 return &elf_howto_table[n];
416 }
417
418 if (code >= BFD_RELOC_XTENSA_SLOT0_ALT
419 && code <= BFD_RELOC_XTENSA_SLOT14_ALT)
420 {
421 unsigned n = (R_XTENSA_SLOT0_ALT +
422 (code - BFD_RELOC_XTENSA_SLOT0_ALT));
423 return &elf_howto_table[n];
424 }
425
426 break;
427 }
428
429 TRACE ("Unknown");
430 return NULL;
431 }
432
433
434 /* Given an ELF "rela" relocation, find the corresponding howto and record
435 it in the BFD internal arelent representation of the relocation. */
436
437 static void
438 elf_xtensa_info_to_howto_rela (bfd *abfd ATTRIBUTE_UNUSED,
439 arelent *cache_ptr,
440 Elf_Internal_Rela *dst)
441 {
442 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
443
444 BFD_ASSERT (r_type < (unsigned int) R_XTENSA_max);
445 cache_ptr->howto = &elf_howto_table[r_type];
446 }
447
448 \f
449 /* Functions for the Xtensa ELF linker. */
450
451 /* The name of the dynamic interpreter. This is put in the .interp
452 section. */
453
454 #define ELF_DYNAMIC_INTERPRETER "/lib/ld.so"
455
456 /* The size in bytes of an entry in the procedure linkage table.
457 (This does _not_ include the space for the literals associated with
458 the PLT entry.) */
459
460 #define PLT_ENTRY_SIZE 16
461
462 /* For _really_ large PLTs, we may need to alternate between literals
463 and code to keep the literals within the 256K range of the L32R
464 instructions in the code. It's unlikely that anyone would ever need
465 such a big PLT, but an arbitrary limit on the PLT size would be bad.
466 Thus, we split the PLT into chunks. Since there's very little
467 overhead (2 extra literals) for each chunk, the chunk size is kept
468 small so that the code for handling multiple chunks get used and
469 tested regularly. With 254 entries, there are 1K of literals for
470 each chunk, and that seems like a nice round number. */
471
472 #define PLT_ENTRIES_PER_CHUNK 254
473
474 /* PLT entries are actually used as stub functions for lazy symbol
475 resolution. Once the symbol is resolved, the stub function is never
476 invoked. Note: the 32-byte frame size used here cannot be changed
477 without a corresponding change in the runtime linker. */
478
479 static const bfd_byte elf_xtensa_be_plt_entry[PLT_ENTRY_SIZE] =
480 {
481 0x6c, 0x10, 0x04, /* entry sp, 32 */
482 0x18, 0x00, 0x00, /* l32r a8, [got entry for rtld's resolver] */
483 0x1a, 0x00, 0x00, /* l32r a10, [got entry for rtld's link map] */
484 0x1b, 0x00, 0x00, /* l32r a11, [literal for reloc index] */
485 0x0a, 0x80, 0x00, /* jx a8 */
486 0 /* unused */
487 };
488
489 static const bfd_byte elf_xtensa_le_plt_entry[PLT_ENTRY_SIZE] =
490 {
491 0x36, 0x41, 0x00, /* entry sp, 32 */
492 0x81, 0x00, 0x00, /* l32r a8, [got entry for rtld's resolver] */
493 0xa1, 0x00, 0x00, /* l32r a10, [got entry for rtld's link map] */
494 0xb1, 0x00, 0x00, /* l32r a11, [literal for reloc index] */
495 0xa0, 0x08, 0x00, /* jx a8 */
496 0 /* unused */
497 };
498
499
500 static inline bfd_boolean
501 xtensa_elf_dynamic_symbol_p (struct elf_link_hash_entry *h,
502 struct bfd_link_info *info)
503 {
504 /* Check if we should do dynamic things to this symbol. The
505 "ignore_protected" argument need not be set, because Xtensa code
506 does not require special handling of STV_PROTECTED to make function
507 pointer comparisons work properly. The PLT addresses are never
508 used for function pointers. */
509
510 return _bfd_elf_dynamic_symbol_p (h, info, 0);
511 }
512
513 \f
514 static int
515 property_table_compare (const void *ap, const void *bp)
516 {
517 const property_table_entry *a = (const property_table_entry *) ap;
518 const property_table_entry *b = (const property_table_entry *) bp;
519
520 if (a->address == b->address)
521 {
522 if (a->size != b->size)
523 return (a->size - b->size);
524
525 if ((a->flags & XTENSA_PROP_ALIGN) != (b->flags & XTENSA_PROP_ALIGN))
526 return ((b->flags & XTENSA_PROP_ALIGN)
527 - (a->flags & XTENSA_PROP_ALIGN));
528
529 if ((a->flags & XTENSA_PROP_ALIGN)
530 && (GET_XTENSA_PROP_ALIGNMENT (a->flags)
531 != GET_XTENSA_PROP_ALIGNMENT (b->flags)))
532 return (GET_XTENSA_PROP_ALIGNMENT (a->flags)
533 - GET_XTENSA_PROP_ALIGNMENT (b->flags));
534
535 if ((a->flags & XTENSA_PROP_UNREACHABLE)
536 != (b->flags & XTENSA_PROP_UNREACHABLE))
537 return ((b->flags & XTENSA_PROP_UNREACHABLE)
538 - (a->flags & XTENSA_PROP_UNREACHABLE));
539
540 return (a->flags - b->flags);
541 }
542
543 return (a->address - b->address);
544 }
545
546
547 static int
548 property_table_matches (const void *ap, const void *bp)
549 {
550 const property_table_entry *a = (const property_table_entry *) ap;
551 const property_table_entry *b = (const property_table_entry *) bp;
552
553 /* Check if one entry overlaps with the other. */
554 if ((b->address >= a->address && b->address < (a->address + a->size))
555 || (a->address >= b->address && a->address < (b->address + b->size)))
556 return 0;
557
558 return (a->address - b->address);
559 }
560
561
562 /* Get the literal table or property table entries for the given
563 section. Sets TABLE_P and returns the number of entries. On
564 error, returns a negative value. */
565
566 static int
567 xtensa_read_table_entries (bfd *abfd,
568 asection *section,
569 property_table_entry **table_p,
570 const char *sec_name,
571 bfd_boolean output_addr)
572 {
573 asection *table_section;
574 char *table_section_name;
575 bfd_size_type table_size = 0;
576 bfd_byte *table_data;
577 property_table_entry *blocks;
578 int blk, block_count;
579 bfd_size_type num_records;
580 Elf_Internal_Rela *internal_relocs;
581 bfd_vma section_addr;
582 flagword predef_flags;
583 bfd_size_type table_entry_size;
584
585 if (!section
586 || !(section->flags & SEC_ALLOC)
587 || (section->flags & SEC_DEBUGGING))
588 {
589 *table_p = NULL;
590 return 0;
591 }
592
593 table_section_name = xtensa_get_property_section_name (section, sec_name);
594 table_section = bfd_get_section_by_name (abfd, table_section_name);
595 free (table_section_name);
596 if (table_section)
597 table_size = table_section->size;
598
599 if (table_size == 0)
600 {
601 *table_p = NULL;
602 return 0;
603 }
604
605 predef_flags = xtensa_get_property_predef_flags (table_section);
606 table_entry_size = 12;
607 if (predef_flags)
608 table_entry_size -= 4;
609
610 num_records = table_size / table_entry_size;
611 table_data = retrieve_contents (abfd, table_section, TRUE);
612 blocks = (property_table_entry *)
613 bfd_malloc (num_records * sizeof (property_table_entry));
614 block_count = 0;
615
616 if (output_addr)
617 section_addr = section->output_section->vma + section->output_offset;
618 else
619 section_addr = section->vma;
620
621 /* If the file has not yet been relocated, process the relocations
622 and sort out the table entries that apply to the specified section. */
623 internal_relocs = retrieve_internal_relocs (abfd, table_section, TRUE);
624 if (internal_relocs && !table_section->reloc_done)
625 {
626 unsigned i;
627
628 for (i = 0; i < table_section->reloc_count; i++)
629 {
630 Elf_Internal_Rela *rel = &internal_relocs[i];
631 unsigned long r_symndx;
632
633 if (ELF32_R_TYPE (rel->r_info) == R_XTENSA_NONE)
634 continue;
635
636 BFD_ASSERT (ELF32_R_TYPE (rel->r_info) == R_XTENSA_32);
637 r_symndx = ELF32_R_SYM (rel->r_info);
638
639 if (get_elf_r_symndx_section (abfd, r_symndx) == section)
640 {
641 bfd_vma sym_off = get_elf_r_symndx_offset (abfd, r_symndx);
642 BFD_ASSERT (sym_off == 0);
643 BFD_ASSERT (rel->r_addend == 0);
644 blocks[block_count].address =
645 (section_addr + sym_off + rel->r_addend
646 + bfd_get_32 (abfd, table_data + rel->r_offset));
647 blocks[block_count].size =
648 bfd_get_32 (abfd, table_data + rel->r_offset + 4);
649 if (predef_flags)
650 blocks[block_count].flags = predef_flags;
651 else
652 blocks[block_count].flags =
653 bfd_get_32 (abfd, table_data + rel->r_offset + 8);
654 block_count++;
655 }
656 }
657 }
658 else
659 {
660 /* The file has already been relocated and the addresses are
661 already in the table. */
662 bfd_vma off;
663 bfd_size_type section_limit = bfd_get_section_limit (abfd, section);
664
665 for (off = 0; off < table_size; off += table_entry_size)
666 {
667 bfd_vma address = bfd_get_32 (abfd, table_data + off);
668
669 if (address >= section_addr
670 && address < section_addr + section_limit)
671 {
672 blocks[block_count].address = address;
673 blocks[block_count].size =
674 bfd_get_32 (abfd, table_data + off + 4);
675 if (predef_flags)
676 blocks[block_count].flags = predef_flags;
677 else
678 blocks[block_count].flags =
679 bfd_get_32 (abfd, table_data + off + 8);
680 block_count++;
681 }
682 }
683 }
684
685 release_contents (table_section, table_data);
686 release_internal_relocs (table_section, internal_relocs);
687
688 if (block_count > 0)
689 {
690 /* Now sort them into address order for easy reference. */
691 qsort (blocks, block_count, sizeof (property_table_entry),
692 property_table_compare);
693
694 /* Check that the table contents are valid. Problems may occur,
695 for example, if an unrelocated object file is stripped. */
696 for (blk = 1; blk < block_count; blk++)
697 {
698 /* The only circumstance where two entries may legitimately
699 have the same address is when one of them is a zero-size
700 placeholder to mark a place where fill can be inserted.
701 The zero-size entry should come first. */
702 if (blocks[blk - 1].address == blocks[blk].address &&
703 blocks[blk - 1].size != 0)
704 {
705 (*_bfd_error_handler) (_("%B(%A): invalid property table"),
706 abfd, section);
707 bfd_set_error (bfd_error_bad_value);
708 free (blocks);
709 return -1;
710 }
711 }
712 }
713
714 *table_p = blocks;
715 return block_count;
716 }
717
718
719 static property_table_entry *
720 elf_xtensa_find_property_entry (property_table_entry *property_table,
721 int property_table_size,
722 bfd_vma addr)
723 {
724 property_table_entry entry;
725 property_table_entry *rv;
726
727 if (property_table_size == 0)
728 return NULL;
729
730 entry.address = addr;
731 entry.size = 1;
732 entry.flags = 0;
733
734 rv = bsearch (&entry, property_table, property_table_size,
735 sizeof (property_table_entry), property_table_matches);
736 return rv;
737 }
738
739
740 static bfd_boolean
741 elf_xtensa_in_literal_pool (property_table_entry *lit_table,
742 int lit_table_size,
743 bfd_vma addr)
744 {
745 if (elf_xtensa_find_property_entry (lit_table, lit_table_size, addr))
746 return TRUE;
747
748 return FALSE;
749 }
750
751 \f
752 /* Look through the relocs for a section during the first phase, and
753 calculate needed space in the dynamic reloc sections. */
754
755 static bfd_boolean
756 elf_xtensa_check_relocs (bfd *abfd,
757 struct bfd_link_info *info,
758 asection *sec,
759 const Elf_Internal_Rela *relocs)
760 {
761 Elf_Internal_Shdr *symtab_hdr;
762 struct elf_link_hash_entry **sym_hashes;
763 const Elf_Internal_Rela *rel;
764 const Elf_Internal_Rela *rel_end;
765
766 if (info->relocatable)
767 return TRUE;
768
769 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
770 sym_hashes = elf_sym_hashes (abfd);
771
772 rel_end = relocs + sec->reloc_count;
773 for (rel = relocs; rel < rel_end; rel++)
774 {
775 unsigned int r_type;
776 unsigned long r_symndx;
777 struct elf_link_hash_entry *h;
778
779 r_symndx = ELF32_R_SYM (rel->r_info);
780 r_type = ELF32_R_TYPE (rel->r_info);
781
782 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
783 {
784 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
785 abfd, r_symndx);
786 return FALSE;
787 }
788
789 if (r_symndx < symtab_hdr->sh_info)
790 h = NULL;
791 else
792 {
793 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
794 while (h->root.type == bfd_link_hash_indirect
795 || h->root.type == bfd_link_hash_warning)
796 h = (struct elf_link_hash_entry *) h->root.u.i.link;
797 }
798
799 switch (r_type)
800 {
801 case R_XTENSA_32:
802 if (h == NULL)
803 goto local_literal;
804
805 if ((sec->flags & SEC_ALLOC) != 0)
806 {
807 if (h->got.refcount <= 0)
808 h->got.refcount = 1;
809 else
810 h->got.refcount += 1;
811 }
812 break;
813
814 case R_XTENSA_PLT:
815 /* If this relocation is against a local symbol, then it's
816 exactly the same as a normal local GOT entry. */
817 if (h == NULL)
818 goto local_literal;
819
820 if ((sec->flags & SEC_ALLOC) != 0)
821 {
822 if (h->plt.refcount <= 0)
823 {
824 h->needs_plt = 1;
825 h->plt.refcount = 1;
826 }
827 else
828 h->plt.refcount += 1;
829
830 /* Keep track of the total PLT relocation count even if we
831 don't yet know whether the dynamic sections will be
832 created. */
833 plt_reloc_count += 1;
834
835 if (elf_hash_table (info)->dynamic_sections_created)
836 {
837 if (!add_extra_plt_sections (elf_hash_table (info)->dynobj,
838 plt_reloc_count))
839 return FALSE;
840 }
841 }
842 break;
843
844 local_literal:
845 if ((sec->flags & SEC_ALLOC) != 0)
846 {
847 bfd_signed_vma *local_got_refcounts;
848
849 /* This is a global offset table entry for a local symbol. */
850 local_got_refcounts = elf_local_got_refcounts (abfd);
851 if (local_got_refcounts == NULL)
852 {
853 bfd_size_type size;
854
855 size = symtab_hdr->sh_info;
856 size *= sizeof (bfd_signed_vma);
857 local_got_refcounts =
858 (bfd_signed_vma *) bfd_zalloc (abfd, size);
859 if (local_got_refcounts == NULL)
860 return FALSE;
861 elf_local_got_refcounts (abfd) = local_got_refcounts;
862 }
863 local_got_refcounts[r_symndx] += 1;
864 }
865 break;
866
867 case R_XTENSA_OP0:
868 case R_XTENSA_OP1:
869 case R_XTENSA_OP2:
870 case R_XTENSA_SLOT0_OP:
871 case R_XTENSA_SLOT1_OP:
872 case R_XTENSA_SLOT2_OP:
873 case R_XTENSA_SLOT3_OP:
874 case R_XTENSA_SLOT4_OP:
875 case R_XTENSA_SLOT5_OP:
876 case R_XTENSA_SLOT6_OP:
877 case R_XTENSA_SLOT7_OP:
878 case R_XTENSA_SLOT8_OP:
879 case R_XTENSA_SLOT9_OP:
880 case R_XTENSA_SLOT10_OP:
881 case R_XTENSA_SLOT11_OP:
882 case R_XTENSA_SLOT12_OP:
883 case R_XTENSA_SLOT13_OP:
884 case R_XTENSA_SLOT14_OP:
885 case R_XTENSA_SLOT0_ALT:
886 case R_XTENSA_SLOT1_ALT:
887 case R_XTENSA_SLOT2_ALT:
888 case R_XTENSA_SLOT3_ALT:
889 case R_XTENSA_SLOT4_ALT:
890 case R_XTENSA_SLOT5_ALT:
891 case R_XTENSA_SLOT6_ALT:
892 case R_XTENSA_SLOT7_ALT:
893 case R_XTENSA_SLOT8_ALT:
894 case R_XTENSA_SLOT9_ALT:
895 case R_XTENSA_SLOT10_ALT:
896 case R_XTENSA_SLOT11_ALT:
897 case R_XTENSA_SLOT12_ALT:
898 case R_XTENSA_SLOT13_ALT:
899 case R_XTENSA_SLOT14_ALT:
900 case R_XTENSA_ASM_EXPAND:
901 case R_XTENSA_ASM_SIMPLIFY:
902 case R_XTENSA_DIFF8:
903 case R_XTENSA_DIFF16:
904 case R_XTENSA_DIFF32:
905 /* Nothing to do for these. */
906 break;
907
908 case R_XTENSA_GNU_VTINHERIT:
909 /* This relocation describes the C++ object vtable hierarchy.
910 Reconstruct it for later use during GC. */
911 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
912 return FALSE;
913 break;
914
915 case R_XTENSA_GNU_VTENTRY:
916 /* This relocation describes which C++ vtable entries are actually
917 used. Record for later use during GC. */
918 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
919 return FALSE;
920 break;
921
922 default:
923 break;
924 }
925 }
926
927 return TRUE;
928 }
929
930
931 static void
932 elf_xtensa_make_sym_local (struct bfd_link_info *info,
933 struct elf_link_hash_entry *h)
934 {
935 if (info->shared)
936 {
937 if (h->plt.refcount > 0)
938 {
939 /* Will use RELATIVE relocs instead of JMP_SLOT relocs. */
940 if (h->got.refcount < 0)
941 h->got.refcount = 0;
942 h->got.refcount += h->plt.refcount;
943 h->plt.refcount = 0;
944 }
945 }
946 else
947 {
948 /* Don't need any dynamic relocations at all. */
949 h->plt.refcount = 0;
950 h->got.refcount = 0;
951 }
952 }
953
954
955 static void
956 elf_xtensa_hide_symbol (struct bfd_link_info *info,
957 struct elf_link_hash_entry *h,
958 bfd_boolean force_local)
959 {
960 /* For a shared link, move the plt refcount to the got refcount to leave
961 space for RELATIVE relocs. */
962 elf_xtensa_make_sym_local (info, h);
963
964 _bfd_elf_link_hash_hide_symbol (info, h, force_local);
965 }
966
967
968 /* Return the section that should be marked against GC for a given
969 relocation. */
970
971 static asection *
972 elf_xtensa_gc_mark_hook (asection *sec,
973 struct bfd_link_info *info ATTRIBUTE_UNUSED,
974 Elf_Internal_Rela *rel,
975 struct elf_link_hash_entry *h,
976 Elf_Internal_Sym *sym)
977 {
978 if (h)
979 {
980 switch (ELF32_R_TYPE (rel->r_info))
981 {
982 case R_XTENSA_GNU_VTINHERIT:
983 case R_XTENSA_GNU_VTENTRY:
984 break;
985
986 default:
987 switch (h->root.type)
988 {
989 case bfd_link_hash_defined:
990 case bfd_link_hash_defweak:
991 return h->root.u.def.section;
992
993 case bfd_link_hash_common:
994 return h->root.u.c.p->section;
995
996 default:
997 break;
998 }
999 }
1000 }
1001 else
1002 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
1003
1004 return NULL;
1005 }
1006
1007
1008 /* Update the GOT & PLT entry reference counts
1009 for the section being removed. */
1010
1011 static bfd_boolean
1012 elf_xtensa_gc_sweep_hook (bfd *abfd,
1013 struct bfd_link_info *info ATTRIBUTE_UNUSED,
1014 asection *sec,
1015 const Elf_Internal_Rela *relocs)
1016 {
1017 Elf_Internal_Shdr *symtab_hdr;
1018 struct elf_link_hash_entry **sym_hashes;
1019 bfd_signed_vma *local_got_refcounts;
1020 const Elf_Internal_Rela *rel, *relend;
1021
1022 if ((sec->flags & SEC_ALLOC) == 0)
1023 return TRUE;
1024
1025 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1026 sym_hashes = elf_sym_hashes (abfd);
1027 local_got_refcounts = elf_local_got_refcounts (abfd);
1028
1029 relend = relocs + sec->reloc_count;
1030 for (rel = relocs; rel < relend; rel++)
1031 {
1032 unsigned long r_symndx;
1033 unsigned int r_type;
1034 struct elf_link_hash_entry *h = NULL;
1035
1036 r_symndx = ELF32_R_SYM (rel->r_info);
1037 if (r_symndx >= symtab_hdr->sh_info)
1038 {
1039 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1040 while (h->root.type == bfd_link_hash_indirect
1041 || h->root.type == bfd_link_hash_warning)
1042 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1043 }
1044
1045 r_type = ELF32_R_TYPE (rel->r_info);
1046 switch (r_type)
1047 {
1048 case R_XTENSA_32:
1049 if (h == NULL)
1050 goto local_literal;
1051 if (h->got.refcount > 0)
1052 h->got.refcount--;
1053 break;
1054
1055 case R_XTENSA_PLT:
1056 if (h == NULL)
1057 goto local_literal;
1058 if (h->plt.refcount > 0)
1059 h->plt.refcount--;
1060 break;
1061
1062 local_literal:
1063 if (local_got_refcounts[r_symndx] > 0)
1064 local_got_refcounts[r_symndx] -= 1;
1065 break;
1066
1067 default:
1068 break;
1069 }
1070 }
1071
1072 return TRUE;
1073 }
1074
1075
1076 /* Create all the dynamic sections. */
1077
1078 static bfd_boolean
1079 elf_xtensa_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
1080 {
1081 flagword flags, noalloc_flags;
1082 asection *s;
1083
1084 /* First do all the standard stuff. */
1085 if (! _bfd_elf_create_dynamic_sections (dynobj, info))
1086 return FALSE;
1087
1088 /* Create any extra PLT sections in case check_relocs has already
1089 been called on all the non-dynamic input files. */
1090 if (!add_extra_plt_sections (dynobj, plt_reloc_count))
1091 return FALSE;
1092
1093 noalloc_flags = (SEC_HAS_CONTENTS | SEC_IN_MEMORY
1094 | SEC_LINKER_CREATED | SEC_READONLY);
1095 flags = noalloc_flags | SEC_ALLOC | SEC_LOAD;
1096
1097 /* Mark the ".got.plt" section READONLY. */
1098 s = bfd_get_section_by_name (dynobj, ".got.plt");
1099 if (s == NULL
1100 || ! bfd_set_section_flags (dynobj, s, flags))
1101 return FALSE;
1102
1103 /* Create ".rela.got". */
1104 s = bfd_make_section_with_flags (dynobj, ".rela.got", flags);
1105 if (s == NULL
1106 || ! bfd_set_section_alignment (dynobj, s, 2))
1107 return FALSE;
1108
1109 /* Create ".got.loc" (literal tables for use by dynamic linker). */
1110 s = bfd_make_section_with_flags (dynobj, ".got.loc", flags);
1111 if (s == NULL
1112 || ! bfd_set_section_alignment (dynobj, s, 2))
1113 return FALSE;
1114
1115 /* Create ".xt.lit.plt" (literal table for ".got.plt*"). */
1116 s = bfd_make_section_with_flags (dynobj, ".xt.lit.plt",
1117 noalloc_flags);
1118 if (s == NULL
1119 || ! bfd_set_section_alignment (dynobj, s, 2))
1120 return FALSE;
1121
1122 return TRUE;
1123 }
1124
1125
1126 static bfd_boolean
1127 add_extra_plt_sections (bfd *dynobj, int count)
1128 {
1129 int chunk;
1130
1131 /* Iterate over all chunks except 0 which uses the standard ".plt" and
1132 ".got.plt" sections. */
1133 for (chunk = count / PLT_ENTRIES_PER_CHUNK; chunk > 0; chunk--)
1134 {
1135 char *sname;
1136 flagword flags;
1137 asection *s;
1138
1139 /* Stop when we find a section has already been created. */
1140 if (elf_xtensa_get_plt_section (dynobj, chunk))
1141 break;
1142
1143 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1144 | SEC_LINKER_CREATED | SEC_READONLY);
1145
1146 sname = (char *) bfd_malloc (10);
1147 sprintf (sname, ".plt.%u", chunk);
1148 s = bfd_make_section_with_flags (dynobj, sname,
1149 flags | SEC_CODE);
1150 if (s == NULL
1151 || ! bfd_set_section_alignment (dynobj, s, 2))
1152 return FALSE;
1153
1154 sname = (char *) bfd_malloc (14);
1155 sprintf (sname, ".got.plt.%u", chunk);
1156 s = bfd_make_section_with_flags (dynobj, sname, flags);
1157 if (s == NULL
1158 || ! bfd_set_section_alignment (dynobj, s, 2))
1159 return FALSE;
1160 }
1161
1162 return TRUE;
1163 }
1164
1165
1166 /* Adjust a symbol defined by a dynamic object and referenced by a
1167 regular object. The current definition is in some section of the
1168 dynamic object, but we're not including those sections. We have to
1169 change the definition to something the rest of the link can
1170 understand. */
1171
1172 static bfd_boolean
1173 elf_xtensa_adjust_dynamic_symbol (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1174 struct elf_link_hash_entry *h)
1175 {
1176 /* If this is a weak symbol, and there is a real definition, the
1177 processor independent code will have arranged for us to see the
1178 real definition first, and we can just use the same value. */
1179 if (h->u.weakdef)
1180 {
1181 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1182 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1183 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1184 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1185 return TRUE;
1186 }
1187
1188 /* This is a reference to a symbol defined by a dynamic object. The
1189 reference must go through the GOT, so there's no need for COPY relocs,
1190 .dynbss, etc. */
1191
1192 return TRUE;
1193 }
1194
1195
1196 static bfd_boolean
1197 elf_xtensa_fix_refcounts (struct elf_link_hash_entry *h, void *arg)
1198 {
1199 struct bfd_link_info *info = (struct bfd_link_info *) arg;
1200
1201 if (h->root.type == bfd_link_hash_warning)
1202 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1203
1204 if (! xtensa_elf_dynamic_symbol_p (h, info))
1205 elf_xtensa_make_sym_local (info, h);
1206
1207 return TRUE;
1208 }
1209
1210
1211 static bfd_boolean
1212 elf_xtensa_allocate_plt_size (struct elf_link_hash_entry *h, void *arg)
1213 {
1214 asection *srelplt = (asection *) arg;
1215
1216 if (h->root.type == bfd_link_hash_warning)
1217 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1218
1219 if (h->plt.refcount > 0)
1220 srelplt->size += (h->plt.refcount * sizeof (Elf32_External_Rela));
1221
1222 return TRUE;
1223 }
1224
1225
1226 static bfd_boolean
1227 elf_xtensa_allocate_got_size (struct elf_link_hash_entry *h, void *arg)
1228 {
1229 asection *srelgot = (asection *) arg;
1230
1231 if (h->root.type == bfd_link_hash_warning)
1232 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1233
1234 if (h->got.refcount > 0)
1235 srelgot->size += (h->got.refcount * sizeof (Elf32_External_Rela));
1236
1237 return TRUE;
1238 }
1239
1240
1241 static void
1242 elf_xtensa_allocate_local_got_size (struct bfd_link_info *info,
1243 asection *srelgot)
1244 {
1245 bfd *i;
1246
1247 for (i = info->input_bfds; i; i = i->link_next)
1248 {
1249 bfd_signed_vma *local_got_refcounts;
1250 bfd_size_type j, cnt;
1251 Elf_Internal_Shdr *symtab_hdr;
1252
1253 local_got_refcounts = elf_local_got_refcounts (i);
1254 if (!local_got_refcounts)
1255 continue;
1256
1257 symtab_hdr = &elf_tdata (i)->symtab_hdr;
1258 cnt = symtab_hdr->sh_info;
1259
1260 for (j = 0; j < cnt; ++j)
1261 {
1262 if (local_got_refcounts[j] > 0)
1263 srelgot->size += (local_got_refcounts[j]
1264 * sizeof (Elf32_External_Rela));
1265 }
1266 }
1267 }
1268
1269
1270 /* Set the sizes of the dynamic sections. */
1271
1272 static bfd_boolean
1273 elf_xtensa_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
1274 struct bfd_link_info *info)
1275 {
1276 bfd *dynobj, *abfd;
1277 asection *s, *srelplt, *splt, *sgotplt, *srelgot, *spltlittbl, *sgotloc;
1278 bfd_boolean relplt, relgot;
1279 int plt_entries, plt_chunks, chunk;
1280
1281 plt_entries = 0;
1282 plt_chunks = 0;
1283 srelgot = 0;
1284
1285 dynobj = elf_hash_table (info)->dynobj;
1286 if (dynobj == NULL)
1287 abort ();
1288
1289 if (elf_hash_table (info)->dynamic_sections_created)
1290 {
1291 /* Set the contents of the .interp section to the interpreter. */
1292 if (info->executable)
1293 {
1294 s = bfd_get_section_by_name (dynobj, ".interp");
1295 if (s == NULL)
1296 abort ();
1297 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
1298 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1299 }
1300
1301 /* Allocate room for one word in ".got". */
1302 s = bfd_get_section_by_name (dynobj, ".got");
1303 if (s == NULL)
1304 abort ();
1305 s->size = 4;
1306
1307 /* Adjust refcounts for symbols that we now know are not "dynamic". */
1308 elf_link_hash_traverse (elf_hash_table (info),
1309 elf_xtensa_fix_refcounts,
1310 (void *) info);
1311
1312 /* Allocate space in ".rela.got" for literals that reference
1313 global symbols. */
1314 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
1315 if (srelgot == NULL)
1316 abort ();
1317 elf_link_hash_traverse (elf_hash_table (info),
1318 elf_xtensa_allocate_got_size,
1319 (void *) srelgot);
1320
1321 /* If we are generating a shared object, we also need space in
1322 ".rela.got" for R_XTENSA_RELATIVE relocs for literals that
1323 reference local symbols. */
1324 if (info->shared)
1325 elf_xtensa_allocate_local_got_size (info, srelgot);
1326
1327 /* Allocate space in ".rela.plt" for literals that have PLT entries. */
1328 srelplt = bfd_get_section_by_name (dynobj, ".rela.plt");
1329 if (srelplt == NULL)
1330 abort ();
1331 elf_link_hash_traverse (elf_hash_table (info),
1332 elf_xtensa_allocate_plt_size,
1333 (void *) srelplt);
1334
1335 /* Allocate space in ".plt" to match the size of ".rela.plt". For
1336 each PLT entry, we need the PLT code plus a 4-byte literal.
1337 For each chunk of ".plt", we also need two more 4-byte
1338 literals, two corresponding entries in ".rela.got", and an
1339 8-byte entry in ".xt.lit.plt". */
1340 spltlittbl = bfd_get_section_by_name (dynobj, ".xt.lit.plt");
1341 if (spltlittbl == NULL)
1342 abort ();
1343
1344 plt_entries = srelplt->size / sizeof (Elf32_External_Rela);
1345 plt_chunks =
1346 (plt_entries + PLT_ENTRIES_PER_CHUNK - 1) / PLT_ENTRIES_PER_CHUNK;
1347
1348 /* Iterate over all the PLT chunks, including any extra sections
1349 created earlier because the initial count of PLT relocations
1350 was an overestimate. */
1351 for (chunk = 0;
1352 (splt = elf_xtensa_get_plt_section (dynobj, chunk)) != NULL;
1353 chunk++)
1354 {
1355 int chunk_entries;
1356
1357 sgotplt = elf_xtensa_get_gotplt_section (dynobj, chunk);
1358 if (sgotplt == NULL)
1359 abort ();
1360
1361 if (chunk < plt_chunks - 1)
1362 chunk_entries = PLT_ENTRIES_PER_CHUNK;
1363 else if (chunk == plt_chunks - 1)
1364 chunk_entries = plt_entries - (chunk * PLT_ENTRIES_PER_CHUNK);
1365 else
1366 chunk_entries = 0;
1367
1368 if (chunk_entries != 0)
1369 {
1370 sgotplt->size = 4 * (chunk_entries + 2);
1371 splt->size = PLT_ENTRY_SIZE * chunk_entries;
1372 srelgot->size += 2 * sizeof (Elf32_External_Rela);
1373 spltlittbl->size += 8;
1374 }
1375 else
1376 {
1377 sgotplt->size = 0;
1378 splt->size = 0;
1379 }
1380 }
1381
1382 /* Allocate space in ".got.loc" to match the total size of all the
1383 literal tables. */
1384 sgotloc = bfd_get_section_by_name (dynobj, ".got.loc");
1385 if (sgotloc == NULL)
1386 abort ();
1387 sgotloc->size = spltlittbl->size;
1388 for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link_next)
1389 {
1390 if (abfd->flags & DYNAMIC)
1391 continue;
1392 for (s = abfd->sections; s != NULL; s = s->next)
1393 {
1394 if (! elf_discarded_section (s)
1395 && xtensa_is_littable_section (s)
1396 && s != spltlittbl)
1397 sgotloc->size += s->size;
1398 }
1399 }
1400 }
1401
1402 /* Allocate memory for dynamic sections. */
1403 relplt = FALSE;
1404 relgot = FALSE;
1405 for (s = dynobj->sections; s != NULL; s = s->next)
1406 {
1407 const char *name;
1408
1409 if ((s->flags & SEC_LINKER_CREATED) == 0)
1410 continue;
1411
1412 /* It's OK to base decisions on the section name, because none
1413 of the dynobj section names depend upon the input files. */
1414 name = bfd_get_section_name (dynobj, s);
1415
1416 if (strncmp (name, ".rela", 5) == 0)
1417 {
1418 if (s->size != 0)
1419 {
1420 if (strcmp (name, ".rela.plt") == 0)
1421 relplt = TRUE;
1422 else if (strcmp (name, ".rela.got") == 0)
1423 relgot = TRUE;
1424
1425 /* We use the reloc_count field as a counter if we need
1426 to copy relocs into the output file. */
1427 s->reloc_count = 0;
1428 }
1429 }
1430 else if (strncmp (name, ".plt.", 5) != 0
1431 && strncmp (name, ".got.plt.", 9) != 0
1432 && strcmp (name, ".got") != 0
1433 && strcmp (name, ".plt") != 0
1434 && strcmp (name, ".got.plt") != 0
1435 && strcmp (name, ".xt.lit.plt") != 0
1436 && strcmp (name, ".got.loc") != 0)
1437 {
1438 /* It's not one of our sections, so don't allocate space. */
1439 continue;
1440 }
1441
1442 if (s->size == 0)
1443 {
1444 /* If we don't need this section, strip it from the output
1445 file. We must create the ".plt*" and ".got.plt*"
1446 sections in create_dynamic_sections and/or check_relocs
1447 based on a conservative estimate of the PLT relocation
1448 count, because the sections must be created before the
1449 linker maps input sections to output sections. The
1450 linker does that before size_dynamic_sections, where we
1451 compute the exact size of the PLT, so there may be more
1452 of these sections than are actually needed. */
1453 s->flags |= SEC_EXCLUDE;
1454 }
1455 else if ((s->flags & SEC_HAS_CONTENTS) != 0)
1456 {
1457 /* Allocate memory for the section contents. */
1458 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
1459 if (s->contents == NULL)
1460 return FALSE;
1461 }
1462 }
1463
1464 if (elf_hash_table (info)->dynamic_sections_created)
1465 {
1466 /* Add the special XTENSA_RTLD relocations now. The offsets won't be
1467 known until finish_dynamic_sections, but we need to get the relocs
1468 in place before they are sorted. */
1469 if (srelgot == NULL)
1470 abort ();
1471 for (chunk = 0; chunk < plt_chunks; chunk++)
1472 {
1473 Elf_Internal_Rela irela;
1474 bfd_byte *loc;
1475
1476 irela.r_offset = 0;
1477 irela.r_info = ELF32_R_INFO (0, R_XTENSA_RTLD);
1478 irela.r_addend = 0;
1479
1480 loc = (srelgot->contents
1481 + srelgot->reloc_count * sizeof (Elf32_External_Rela));
1482 bfd_elf32_swap_reloca_out (output_bfd, &irela, loc);
1483 bfd_elf32_swap_reloca_out (output_bfd, &irela,
1484 loc + sizeof (Elf32_External_Rela));
1485 srelgot->reloc_count += 2;
1486 }
1487
1488 /* Add some entries to the .dynamic section. We fill in the
1489 values later, in elf_xtensa_finish_dynamic_sections, but we
1490 must add the entries now so that we get the correct size for
1491 the .dynamic section. The DT_DEBUG entry is filled in by the
1492 dynamic linker and used by the debugger. */
1493 #define add_dynamic_entry(TAG, VAL) \
1494 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
1495
1496 if (! info->shared)
1497 {
1498 if (!add_dynamic_entry (DT_DEBUG, 0))
1499 return FALSE;
1500 }
1501
1502 if (relplt)
1503 {
1504 if (!add_dynamic_entry (DT_PLTGOT, 0)
1505 || !add_dynamic_entry (DT_PLTRELSZ, 0)
1506 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
1507 || !add_dynamic_entry (DT_JMPREL, 0))
1508 return FALSE;
1509 }
1510
1511 if (relgot)
1512 {
1513 if (!add_dynamic_entry (DT_RELA, 0)
1514 || !add_dynamic_entry (DT_RELASZ, 0)
1515 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
1516 return FALSE;
1517 }
1518
1519 if (!add_dynamic_entry (DT_XTENSA_GOT_LOC_OFF, 0)
1520 || !add_dynamic_entry (DT_XTENSA_GOT_LOC_SZ, 0))
1521 return FALSE;
1522 }
1523 #undef add_dynamic_entry
1524
1525 return TRUE;
1526 }
1527
1528 \f
1529 /* Remove any PT_LOAD segments with no allocated sections. Prior to
1530 binutils 2.13, this function used to remove the non-SEC_ALLOC
1531 sections from PT_LOAD segments, but that task has now been moved
1532 into elf.c. We still need this function to remove any empty
1533 segments that result, but there's nothing Xtensa-specific about
1534 this and it probably ought to be moved into elf.c as well. */
1535
1536 static bfd_boolean
1537 elf_xtensa_modify_segment_map (bfd *abfd,
1538 struct bfd_link_info *info ATTRIBUTE_UNUSED)
1539 {
1540 struct elf_segment_map **m_p;
1541
1542 m_p = &elf_tdata (abfd)->segment_map;
1543 while (*m_p)
1544 {
1545 if ((*m_p)->p_type == PT_LOAD && (*m_p)->count == 0)
1546 *m_p = (*m_p)->next;
1547 else
1548 m_p = &(*m_p)->next;
1549 }
1550 return TRUE;
1551 }
1552
1553 \f
1554 /* Perform the specified relocation. The instruction at (contents + address)
1555 is modified to set one operand to represent the value in "relocation". The
1556 operand position is determined by the relocation type recorded in the
1557 howto. */
1558
1559 #define CALL_SEGMENT_BITS (30)
1560 #define CALL_SEGMENT_SIZE (1 << CALL_SEGMENT_BITS)
1561
1562 static bfd_reloc_status_type
1563 elf_xtensa_do_reloc (reloc_howto_type *howto,
1564 bfd *abfd,
1565 asection *input_section,
1566 bfd_vma relocation,
1567 bfd_byte *contents,
1568 bfd_vma address,
1569 bfd_boolean is_weak_undef,
1570 char **error_message)
1571 {
1572 xtensa_format fmt;
1573 xtensa_opcode opcode;
1574 xtensa_isa isa = xtensa_default_isa;
1575 static xtensa_insnbuf ibuff = NULL;
1576 static xtensa_insnbuf sbuff = NULL;
1577 bfd_vma self_address = 0;
1578 bfd_size_type input_size;
1579 int opnd, slot;
1580 uint32 newval;
1581
1582 if (!ibuff)
1583 {
1584 ibuff = xtensa_insnbuf_alloc (isa);
1585 sbuff = xtensa_insnbuf_alloc (isa);
1586 }
1587
1588 input_size = bfd_get_section_limit (abfd, input_section);
1589
1590 switch (howto->type)
1591 {
1592 case R_XTENSA_NONE:
1593 case R_XTENSA_DIFF8:
1594 case R_XTENSA_DIFF16:
1595 case R_XTENSA_DIFF32:
1596 return bfd_reloc_ok;
1597
1598 case R_XTENSA_ASM_EXPAND:
1599 if (!is_weak_undef)
1600 {
1601 /* Check for windowed CALL across a 1GB boundary. */
1602 xtensa_opcode opcode =
1603 get_expanded_call_opcode (contents + address,
1604 input_size - address, 0);
1605 if (is_windowed_call_opcode (opcode))
1606 {
1607 self_address = (input_section->output_section->vma
1608 + input_section->output_offset
1609 + address);
1610 if ((self_address >> CALL_SEGMENT_BITS)
1611 != (relocation >> CALL_SEGMENT_BITS))
1612 {
1613 *error_message = "windowed longcall crosses 1GB boundary; "
1614 "return may fail";
1615 return bfd_reloc_dangerous;
1616 }
1617 }
1618 }
1619 return bfd_reloc_ok;
1620
1621 case R_XTENSA_ASM_SIMPLIFY:
1622 {
1623 /* Convert the L32R/CALLX to CALL. */
1624 bfd_reloc_status_type retval =
1625 elf_xtensa_do_asm_simplify (contents, address, input_size,
1626 error_message);
1627 if (retval != bfd_reloc_ok)
1628 return bfd_reloc_dangerous;
1629
1630 /* The CALL needs to be relocated. Continue below for that part. */
1631 address += 3;
1632 howto = &elf_howto_table[(unsigned) R_XTENSA_SLOT0_OP ];
1633 }
1634 break;
1635
1636 case R_XTENSA_32:
1637 case R_XTENSA_PLT:
1638 {
1639 bfd_vma x;
1640 x = bfd_get_32 (abfd, contents + address);
1641 x = x + relocation;
1642 bfd_put_32 (abfd, x, contents + address);
1643 }
1644 return bfd_reloc_ok;
1645 }
1646
1647 /* Only instruction slot-specific relocations handled below.... */
1648 slot = get_relocation_slot (howto->type);
1649 if (slot == XTENSA_UNDEFINED)
1650 {
1651 *error_message = "unexpected relocation";
1652 return bfd_reloc_dangerous;
1653 }
1654
1655 /* Read the instruction into a buffer and decode the opcode. */
1656 xtensa_insnbuf_from_chars (isa, ibuff, contents + address,
1657 input_size - address);
1658 fmt = xtensa_format_decode (isa, ibuff);
1659 if (fmt == XTENSA_UNDEFINED)
1660 {
1661 *error_message = "cannot decode instruction format";
1662 return bfd_reloc_dangerous;
1663 }
1664
1665 xtensa_format_get_slot (isa, fmt, slot, ibuff, sbuff);
1666
1667 opcode = xtensa_opcode_decode (isa, fmt, slot, sbuff);
1668 if (opcode == XTENSA_UNDEFINED)
1669 {
1670 *error_message = "cannot decode instruction opcode";
1671 return bfd_reloc_dangerous;
1672 }
1673
1674 /* Check for opcode-specific "alternate" relocations. */
1675 if (is_alt_relocation (howto->type))
1676 {
1677 if (opcode == get_l32r_opcode ())
1678 {
1679 /* Handle the special-case of non-PC-relative L32R instructions. */
1680 bfd *output_bfd = input_section->output_section->owner;
1681 asection *lit4_sec = bfd_get_section_by_name (output_bfd, ".lit4");
1682 if (!lit4_sec)
1683 {
1684 *error_message = "relocation references missing .lit4 section";
1685 return bfd_reloc_dangerous;
1686 }
1687 self_address = ((lit4_sec->vma & ~0xfff)
1688 + 0x40000 - 3); /* -3 to compensate for do_reloc */
1689 newval = relocation;
1690 opnd = 1;
1691 }
1692 else if (opcode == get_const16_opcode ())
1693 {
1694 /* ALT used for high 16 bits. */
1695 newval = relocation >> 16;
1696 opnd = 1;
1697 }
1698 else
1699 {
1700 /* No other "alternate" relocations currently defined. */
1701 *error_message = "unexpected relocation";
1702 return bfd_reloc_dangerous;
1703 }
1704 }
1705 else /* Not an "alternate" relocation.... */
1706 {
1707 if (opcode == get_const16_opcode ())
1708 {
1709 newval = relocation & 0xffff;
1710 opnd = 1;
1711 }
1712 else
1713 {
1714 /* ...normal PC-relative relocation.... */
1715
1716 /* Determine which operand is being relocated. */
1717 opnd = get_relocation_opnd (opcode, howto->type);
1718 if (opnd == XTENSA_UNDEFINED)
1719 {
1720 *error_message = "unexpected relocation";
1721 return bfd_reloc_dangerous;
1722 }
1723
1724 if (!howto->pc_relative)
1725 {
1726 *error_message = "expected PC-relative relocation";
1727 return bfd_reloc_dangerous;
1728 }
1729
1730 /* Calculate the PC address for this instruction. */
1731 self_address = (input_section->output_section->vma
1732 + input_section->output_offset
1733 + address);
1734
1735 newval = relocation;
1736 }
1737 }
1738
1739 /* Apply the relocation. */
1740 if (xtensa_operand_do_reloc (isa, opcode, opnd, &newval, self_address)
1741 || xtensa_operand_encode (isa, opcode, opnd, &newval)
1742 || xtensa_operand_set_field (isa, opcode, opnd, fmt, slot,
1743 sbuff, newval))
1744 {
1745 const char *opname = xtensa_opcode_name (isa, opcode);
1746 const char *msg;
1747
1748 msg = "cannot encode";
1749 if (is_direct_call_opcode (opcode))
1750 {
1751 if ((relocation & 0x3) != 0)
1752 msg = "misaligned call target";
1753 else
1754 msg = "call target out of range";
1755 }
1756 else if (opcode == get_l32r_opcode ())
1757 {
1758 if ((relocation & 0x3) != 0)
1759 msg = "misaligned literal target";
1760 else if (is_alt_relocation (howto->type))
1761 msg = "literal target out of range (too many literals)";
1762 else if (self_address > relocation)
1763 msg = "literal target out of range (try using text-section-literals)";
1764 else
1765 msg = "literal placed after use";
1766 }
1767
1768 *error_message = vsprint_msg (opname, ": %s", strlen (msg) + 2, msg);
1769 return bfd_reloc_dangerous;
1770 }
1771
1772 /* Check for calls across 1GB boundaries. */
1773 if (is_direct_call_opcode (opcode)
1774 && is_windowed_call_opcode (opcode))
1775 {
1776 if ((self_address >> CALL_SEGMENT_BITS)
1777 != (relocation >> CALL_SEGMENT_BITS))
1778 {
1779 *error_message =
1780 "windowed call crosses 1GB boundary; return may fail";
1781 return bfd_reloc_dangerous;
1782 }
1783 }
1784
1785 /* Write the modified instruction back out of the buffer. */
1786 xtensa_format_set_slot (isa, fmt, slot, ibuff, sbuff);
1787 xtensa_insnbuf_to_chars (isa, ibuff, contents + address,
1788 input_size - address);
1789 return bfd_reloc_ok;
1790 }
1791
1792
1793 static char *
1794 vsprint_msg (const char *origmsg, const char *fmt, int arglen, ...)
1795 {
1796 /* To reduce the size of the memory leak,
1797 we only use a single message buffer. */
1798 static bfd_size_type alloc_size = 0;
1799 static char *message = NULL;
1800 bfd_size_type orig_len, len = 0;
1801 bfd_boolean is_append;
1802
1803 VA_OPEN (ap, arglen);
1804 VA_FIXEDARG (ap, const char *, origmsg);
1805
1806 is_append = (origmsg == message);
1807
1808 orig_len = strlen (origmsg);
1809 len = orig_len + strlen (fmt) + arglen + 20;
1810 if (len > alloc_size)
1811 {
1812 message = (char *) bfd_realloc (message, len);
1813 alloc_size = len;
1814 }
1815 if (!is_append)
1816 memcpy (message, origmsg, orig_len);
1817 vsprintf (message + orig_len, fmt, ap);
1818 VA_CLOSE (ap);
1819 return message;
1820 }
1821
1822
1823 /* This function is registered as the "special_function" in the
1824 Xtensa howto for handling simplify operations.
1825 bfd_perform_relocation / bfd_install_relocation use it to
1826 perform (install) the specified relocation. Since this replaces the code
1827 in bfd_perform_relocation, it is basically an Xtensa-specific,
1828 stripped-down version of bfd_perform_relocation. */
1829
1830 static bfd_reloc_status_type
1831 bfd_elf_xtensa_reloc (bfd *abfd,
1832 arelent *reloc_entry,
1833 asymbol *symbol,
1834 void *data,
1835 asection *input_section,
1836 bfd *output_bfd,
1837 char **error_message)
1838 {
1839 bfd_vma relocation;
1840 bfd_reloc_status_type flag;
1841 bfd_size_type octets = reloc_entry->address * bfd_octets_per_byte (abfd);
1842 bfd_vma output_base = 0;
1843 reloc_howto_type *howto = reloc_entry->howto;
1844 asection *reloc_target_output_section;
1845 bfd_boolean is_weak_undef;
1846
1847 if (!xtensa_default_isa)
1848 xtensa_default_isa = xtensa_isa_init (0, 0);
1849
1850 /* ELF relocs are against symbols. If we are producing relocatable
1851 output, and the reloc is against an external symbol, the resulting
1852 reloc will also be against the same symbol. In such a case, we
1853 don't want to change anything about the way the reloc is handled,
1854 since it will all be done at final link time. This test is similar
1855 to what bfd_elf_generic_reloc does except that it lets relocs with
1856 howto->partial_inplace go through even if the addend is non-zero.
1857 (The real problem is that partial_inplace is set for XTENSA_32
1858 relocs to begin with, but that's a long story and there's little we
1859 can do about it now....) */
1860
1861 if (output_bfd && (symbol->flags & BSF_SECTION_SYM) == 0)
1862 {
1863 reloc_entry->address += input_section->output_offset;
1864 return bfd_reloc_ok;
1865 }
1866
1867 /* Is the address of the relocation really within the section? */
1868 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section))
1869 return bfd_reloc_outofrange;
1870
1871 /* Work out which section the relocation is targeted at and the
1872 initial relocation command value. */
1873
1874 /* Get symbol value. (Common symbols are special.) */
1875 if (bfd_is_com_section (symbol->section))
1876 relocation = 0;
1877 else
1878 relocation = symbol->value;
1879
1880 reloc_target_output_section = symbol->section->output_section;
1881
1882 /* Convert input-section-relative symbol value to absolute. */
1883 if ((output_bfd && !howto->partial_inplace)
1884 || reloc_target_output_section == NULL)
1885 output_base = 0;
1886 else
1887 output_base = reloc_target_output_section->vma;
1888
1889 relocation += output_base + symbol->section->output_offset;
1890
1891 /* Add in supplied addend. */
1892 relocation += reloc_entry->addend;
1893
1894 /* Here the variable relocation holds the final address of the
1895 symbol we are relocating against, plus any addend. */
1896 if (output_bfd)
1897 {
1898 if (!howto->partial_inplace)
1899 {
1900 /* This is a partial relocation, and we want to apply the relocation
1901 to the reloc entry rather than the raw data. Everything except
1902 relocations against section symbols has already been handled
1903 above. */
1904
1905 BFD_ASSERT (symbol->flags & BSF_SECTION_SYM);
1906 reloc_entry->addend = relocation;
1907 reloc_entry->address += input_section->output_offset;
1908 return bfd_reloc_ok;
1909 }
1910 else
1911 {
1912 reloc_entry->address += input_section->output_offset;
1913 reloc_entry->addend = 0;
1914 }
1915 }
1916
1917 is_weak_undef = (bfd_is_und_section (symbol->section)
1918 && (symbol->flags & BSF_WEAK) != 0);
1919 flag = elf_xtensa_do_reloc (howto, abfd, input_section, relocation,
1920 (bfd_byte *) data, (bfd_vma) octets,
1921 is_weak_undef, error_message);
1922
1923 if (flag == bfd_reloc_dangerous)
1924 {
1925 /* Add the symbol name to the error message. */
1926 if (! *error_message)
1927 *error_message = "";
1928 *error_message = vsprint_msg (*error_message, ": (%s + 0x%lx)",
1929 strlen (symbol->name) + 17,
1930 symbol->name,
1931 (unsigned long) reloc_entry->addend);
1932 }
1933
1934 return flag;
1935 }
1936
1937
1938 /* Set up an entry in the procedure linkage table. */
1939
1940 static bfd_vma
1941 elf_xtensa_create_plt_entry (bfd *dynobj,
1942 bfd *output_bfd,
1943 unsigned reloc_index)
1944 {
1945 asection *splt, *sgotplt;
1946 bfd_vma plt_base, got_base;
1947 bfd_vma code_offset, lit_offset;
1948 int chunk;
1949
1950 chunk = reloc_index / PLT_ENTRIES_PER_CHUNK;
1951 splt = elf_xtensa_get_plt_section (dynobj, chunk);
1952 sgotplt = elf_xtensa_get_gotplt_section (dynobj, chunk);
1953 BFD_ASSERT (splt != NULL && sgotplt != NULL);
1954
1955 plt_base = splt->output_section->vma + splt->output_offset;
1956 got_base = sgotplt->output_section->vma + sgotplt->output_offset;
1957
1958 lit_offset = 8 + (reloc_index % PLT_ENTRIES_PER_CHUNK) * 4;
1959 code_offset = (reloc_index % PLT_ENTRIES_PER_CHUNK) * PLT_ENTRY_SIZE;
1960
1961 /* Fill in the literal entry. This is the offset of the dynamic
1962 relocation entry. */
1963 bfd_put_32 (output_bfd, reloc_index * sizeof (Elf32_External_Rela),
1964 sgotplt->contents + lit_offset);
1965
1966 /* Fill in the entry in the procedure linkage table. */
1967 memcpy (splt->contents + code_offset,
1968 (bfd_big_endian (output_bfd)
1969 ? elf_xtensa_be_plt_entry
1970 : elf_xtensa_le_plt_entry),
1971 PLT_ENTRY_SIZE);
1972 bfd_put_16 (output_bfd, l32r_offset (got_base + 0,
1973 plt_base + code_offset + 3),
1974 splt->contents + code_offset + 4);
1975 bfd_put_16 (output_bfd, l32r_offset (got_base + 4,
1976 plt_base + code_offset + 6),
1977 splt->contents + code_offset + 7);
1978 bfd_put_16 (output_bfd, l32r_offset (got_base + lit_offset,
1979 plt_base + code_offset + 9),
1980 splt->contents + code_offset + 10);
1981
1982 return plt_base + code_offset;
1983 }
1984
1985
1986 /* Relocate an Xtensa ELF section. This is invoked by the linker for
1987 both relocatable and final links. */
1988
1989 static bfd_boolean
1990 elf_xtensa_relocate_section (bfd *output_bfd,
1991 struct bfd_link_info *info,
1992 bfd *input_bfd,
1993 asection *input_section,
1994 bfd_byte *contents,
1995 Elf_Internal_Rela *relocs,
1996 Elf_Internal_Sym *local_syms,
1997 asection **local_sections)
1998 {
1999 Elf_Internal_Shdr *symtab_hdr;
2000 Elf_Internal_Rela *rel;
2001 Elf_Internal_Rela *relend;
2002 struct elf_link_hash_entry **sym_hashes;
2003 asection *srelgot, *srelplt;
2004 bfd *dynobj;
2005 property_table_entry *lit_table = 0;
2006 int ltblsize = 0;
2007 char *error_message = NULL;
2008 bfd_size_type input_size;
2009
2010 if (!xtensa_default_isa)
2011 xtensa_default_isa = xtensa_isa_init (0, 0);
2012
2013 dynobj = elf_hash_table (info)->dynobj;
2014 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
2015 sym_hashes = elf_sym_hashes (input_bfd);
2016
2017 srelgot = NULL;
2018 srelplt = NULL;
2019 if (dynobj)
2020 {
2021 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");;
2022 srelplt = bfd_get_section_by_name (dynobj, ".rela.plt");
2023 }
2024
2025 if (elf_hash_table (info)->dynamic_sections_created)
2026 {
2027 ltblsize = xtensa_read_table_entries (input_bfd, input_section,
2028 &lit_table, XTENSA_LIT_SEC_NAME,
2029 TRUE);
2030 if (ltblsize < 0)
2031 return FALSE;
2032 }
2033
2034 input_size = bfd_get_section_limit (input_bfd, input_section);
2035
2036 rel = relocs;
2037 relend = relocs + input_section->reloc_count;
2038 for (; rel < relend; rel++)
2039 {
2040 int r_type;
2041 reloc_howto_type *howto;
2042 unsigned long r_symndx;
2043 struct elf_link_hash_entry *h;
2044 Elf_Internal_Sym *sym;
2045 asection *sec;
2046 bfd_vma relocation;
2047 bfd_reloc_status_type r;
2048 bfd_boolean is_weak_undef;
2049 bfd_boolean unresolved_reloc;
2050 bfd_boolean warned;
2051
2052 r_type = ELF32_R_TYPE (rel->r_info);
2053 if (r_type == (int) R_XTENSA_GNU_VTINHERIT
2054 || r_type == (int) R_XTENSA_GNU_VTENTRY)
2055 continue;
2056
2057 if (r_type < 0 || r_type >= (int) R_XTENSA_max)
2058 {
2059 bfd_set_error (bfd_error_bad_value);
2060 return FALSE;
2061 }
2062 howto = &elf_howto_table[r_type];
2063
2064 r_symndx = ELF32_R_SYM (rel->r_info);
2065
2066 if (info->relocatable)
2067 {
2068 /* This is a relocatable link.
2069 1) If the reloc is against a section symbol, adjust
2070 according to the output section.
2071 2) If there is a new target for this relocation,
2072 the new target will be in the same output section.
2073 We adjust the relocation by the output section
2074 difference. */
2075
2076 if (relaxing_section)
2077 {
2078 /* Check if this references a section in another input file. */
2079 if (!do_fix_for_relocatable_link (rel, input_bfd, input_section,
2080 contents))
2081 return FALSE;
2082 r_type = ELF32_R_TYPE (rel->r_info);
2083 }
2084
2085 if (r_type == R_XTENSA_ASM_SIMPLIFY)
2086 {
2087 char *error_message = NULL;
2088 /* Convert ASM_SIMPLIFY into the simpler relocation
2089 so that they never escape a relaxing link. */
2090 r = contract_asm_expansion (contents, input_size, rel,
2091 &error_message);
2092 if (r != bfd_reloc_ok)
2093 {
2094 if (!((*info->callbacks->reloc_dangerous)
2095 (info, error_message, input_bfd, input_section,
2096 rel->r_offset)))
2097 return FALSE;
2098 }
2099 r_type = ELF32_R_TYPE (rel->r_info);
2100 }
2101
2102 /* This is a relocatable link, so we don't have to change
2103 anything unless the reloc is against a section symbol,
2104 in which case we have to adjust according to where the
2105 section symbol winds up in the output section. */
2106 if (r_symndx < symtab_hdr->sh_info)
2107 {
2108 sym = local_syms + r_symndx;
2109 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
2110 {
2111 sec = local_sections[r_symndx];
2112 rel->r_addend += sec->output_offset + sym->st_value;
2113 }
2114 }
2115
2116 /* If there is an addend with a partial_inplace howto,
2117 then move the addend to the contents. This is a hack
2118 to work around problems with DWARF in relocatable links
2119 with some previous version of BFD. Now we can't easily get
2120 rid of the hack without breaking backward compatibility.... */
2121 if (rel->r_addend)
2122 {
2123 howto = &elf_howto_table[r_type];
2124 if (howto->partial_inplace)
2125 {
2126 r = elf_xtensa_do_reloc (howto, input_bfd, input_section,
2127 rel->r_addend, contents,
2128 rel->r_offset, FALSE,
2129 &error_message);
2130 if (r != bfd_reloc_ok)
2131 {
2132 if (!((*info->callbacks->reloc_dangerous)
2133 (info, error_message, input_bfd, input_section,
2134 rel->r_offset)))
2135 return FALSE;
2136 }
2137 rel->r_addend = 0;
2138 }
2139 }
2140
2141 /* Done with work for relocatable link; continue with next reloc. */
2142 continue;
2143 }
2144
2145 /* This is a final link. */
2146
2147 h = NULL;
2148 sym = NULL;
2149 sec = NULL;
2150 is_weak_undef = FALSE;
2151 unresolved_reloc = FALSE;
2152 warned = FALSE;
2153
2154 if (howto->partial_inplace)
2155 {
2156 /* Because R_XTENSA_32 was made partial_inplace to fix some
2157 problems with DWARF info in partial links, there may be
2158 an addend stored in the contents. Take it out of there
2159 and move it back into the addend field of the reloc. */
2160 rel->r_addend += bfd_get_32 (input_bfd, contents + rel->r_offset);
2161 bfd_put_32 (input_bfd, 0, contents + rel->r_offset);
2162 }
2163
2164 if (r_symndx < symtab_hdr->sh_info)
2165 {
2166 sym = local_syms + r_symndx;
2167 sec = local_sections[r_symndx];
2168 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
2169 }
2170 else
2171 {
2172 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2173 r_symndx, symtab_hdr, sym_hashes,
2174 h, sec, relocation,
2175 unresolved_reloc, warned);
2176
2177 if (relocation == 0
2178 && !unresolved_reloc
2179 && h->root.type == bfd_link_hash_undefweak)
2180 is_weak_undef = TRUE;
2181 }
2182
2183 if (relaxing_section)
2184 {
2185 /* Check if this references a section in another input file. */
2186 do_fix_for_final_link (rel, input_bfd, input_section, contents,
2187 &relocation);
2188
2189 /* Update some already cached values. */
2190 r_type = ELF32_R_TYPE (rel->r_info);
2191 howto = &elf_howto_table[r_type];
2192 }
2193
2194 /* Sanity check the address. */
2195 if (rel->r_offset >= input_size
2196 && ELF32_R_TYPE (rel->r_info) != R_XTENSA_NONE)
2197 {
2198 (*_bfd_error_handler)
2199 (_("%B(%A+0x%lx): relocation offset out of range (size=0x%x)"),
2200 input_bfd, input_section, rel->r_offset, input_size);
2201 bfd_set_error (bfd_error_bad_value);
2202 return FALSE;
2203 }
2204
2205 /* Generate dynamic relocations. */
2206 if (elf_hash_table (info)->dynamic_sections_created)
2207 {
2208 bfd_boolean dynamic_symbol = xtensa_elf_dynamic_symbol_p (h, info);
2209
2210 if (dynamic_symbol && is_operand_relocation (r_type))
2211 {
2212 /* This is an error. The symbol's real value won't be known
2213 until runtime and it's likely to be out of range anyway. */
2214 const char *name = h->root.root.string;
2215 error_message = vsprint_msg ("invalid relocation for dynamic "
2216 "symbol", ": %s",
2217 strlen (name) + 2, name);
2218 if (!((*info->callbacks->reloc_dangerous)
2219 (info, error_message, input_bfd, input_section,
2220 rel->r_offset)))
2221 return FALSE;
2222 }
2223 else if ((r_type == R_XTENSA_32 || r_type == R_XTENSA_PLT)
2224 && (input_section->flags & SEC_ALLOC) != 0
2225 && (dynamic_symbol || info->shared))
2226 {
2227 Elf_Internal_Rela outrel;
2228 bfd_byte *loc;
2229 asection *srel;
2230
2231 if (dynamic_symbol && r_type == R_XTENSA_PLT)
2232 srel = srelplt;
2233 else
2234 srel = srelgot;
2235
2236 BFD_ASSERT (srel != NULL);
2237
2238 outrel.r_offset =
2239 _bfd_elf_section_offset (output_bfd, info,
2240 input_section, rel->r_offset);
2241
2242 if ((outrel.r_offset | 1) == (bfd_vma) -1)
2243 memset (&outrel, 0, sizeof outrel);
2244 else
2245 {
2246 outrel.r_offset += (input_section->output_section->vma
2247 + input_section->output_offset);
2248
2249 /* Complain if the relocation is in a read-only section
2250 and not in a literal pool. */
2251 if ((input_section->flags & SEC_READONLY) != 0
2252 && !elf_xtensa_in_literal_pool (lit_table, ltblsize,
2253 outrel.r_offset))
2254 {
2255 error_message =
2256 _("dynamic relocation in read-only section");
2257 if (!((*info->callbacks->reloc_dangerous)
2258 (info, error_message, input_bfd, input_section,
2259 rel->r_offset)))
2260 return FALSE;
2261 }
2262
2263 if (dynamic_symbol)
2264 {
2265 outrel.r_addend = rel->r_addend;
2266 rel->r_addend = 0;
2267
2268 if (r_type == R_XTENSA_32)
2269 {
2270 outrel.r_info =
2271 ELF32_R_INFO (h->dynindx, R_XTENSA_GLOB_DAT);
2272 relocation = 0;
2273 }
2274 else /* r_type == R_XTENSA_PLT */
2275 {
2276 outrel.r_info =
2277 ELF32_R_INFO (h->dynindx, R_XTENSA_JMP_SLOT);
2278
2279 /* Create the PLT entry and set the initial
2280 contents of the literal entry to the address of
2281 the PLT entry. */
2282 relocation =
2283 elf_xtensa_create_plt_entry (dynobj, output_bfd,
2284 srel->reloc_count);
2285 }
2286 unresolved_reloc = FALSE;
2287 }
2288 else
2289 {
2290 /* Generate a RELATIVE relocation. */
2291 outrel.r_info = ELF32_R_INFO (0, R_XTENSA_RELATIVE);
2292 outrel.r_addend = 0;
2293 }
2294 }
2295
2296 loc = (srel->contents
2297 + srel->reloc_count++ * sizeof (Elf32_External_Rela));
2298 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2299 BFD_ASSERT (sizeof (Elf32_External_Rela) * srel->reloc_count
2300 <= srel->size);
2301 }
2302 }
2303
2304 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
2305 because such sections are not SEC_ALLOC and thus ld.so will
2306 not process them. */
2307 if (unresolved_reloc
2308 && !((input_section->flags & SEC_DEBUGGING) != 0
2309 && h->def_dynamic))
2310 (*_bfd_error_handler)
2311 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
2312 input_bfd,
2313 input_section,
2314 (long) rel->r_offset,
2315 howto->name,
2316 h->root.root.string);
2317
2318 /* There's no point in calling bfd_perform_relocation here.
2319 Just go directly to our "special function". */
2320 r = elf_xtensa_do_reloc (howto, input_bfd, input_section,
2321 relocation + rel->r_addend,
2322 contents, rel->r_offset, is_weak_undef,
2323 &error_message);
2324
2325 if (r != bfd_reloc_ok && !warned)
2326 {
2327 const char *name;
2328
2329 BFD_ASSERT (r == bfd_reloc_dangerous || r == bfd_reloc_other);
2330 BFD_ASSERT (error_message != NULL);
2331
2332 if (h)
2333 name = h->root.root.string;
2334 else
2335 {
2336 name = bfd_elf_string_from_elf_section
2337 (input_bfd, symtab_hdr->sh_link, sym->st_name);
2338 if (name && *name == '\0')
2339 name = bfd_section_name (input_bfd, sec);
2340 }
2341 if (name)
2342 {
2343 if (rel->r_addend == 0)
2344 error_message = vsprint_msg (error_message, ": %s",
2345 strlen (name) + 2, name);
2346 else
2347 error_message = vsprint_msg (error_message, ": (%s+0x%x)",
2348 strlen (name) + 22,
2349 name, (int)rel->r_addend);
2350 }
2351
2352 if (!((*info->callbacks->reloc_dangerous)
2353 (info, error_message, input_bfd, input_section,
2354 rel->r_offset)))
2355 return FALSE;
2356 }
2357 }
2358
2359 if (lit_table)
2360 free (lit_table);
2361
2362 input_section->reloc_done = TRUE;
2363
2364 return TRUE;
2365 }
2366
2367
2368 /* Finish up dynamic symbol handling. There's not much to do here since
2369 the PLT and GOT entries are all set up by relocate_section. */
2370
2371 static bfd_boolean
2372 elf_xtensa_finish_dynamic_symbol (bfd *output_bfd ATTRIBUTE_UNUSED,
2373 struct bfd_link_info *info ATTRIBUTE_UNUSED,
2374 struct elf_link_hash_entry *h,
2375 Elf_Internal_Sym *sym)
2376 {
2377 if (h->needs_plt
2378 && !h->def_regular)
2379 {
2380 /* Mark the symbol as undefined, rather than as defined in
2381 the .plt section. Leave the value alone. */
2382 sym->st_shndx = SHN_UNDEF;
2383 }
2384
2385 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
2386 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
2387 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
2388 sym->st_shndx = SHN_ABS;
2389
2390 return TRUE;
2391 }
2392
2393
2394 /* Combine adjacent literal table entries in the output. Adjacent
2395 entries within each input section may have been removed during
2396 relaxation, but we repeat the process here, even though it's too late
2397 to shrink the output section, because it's important to minimize the
2398 number of literal table entries to reduce the start-up work for the
2399 runtime linker. Returns the number of remaining table entries or -1
2400 on error. */
2401
2402 static int
2403 elf_xtensa_combine_prop_entries (bfd *output_bfd,
2404 asection *sxtlit,
2405 asection *sgotloc)
2406 {
2407 bfd_byte *contents;
2408 property_table_entry *table;
2409 bfd_size_type section_size, sgotloc_size;
2410 bfd_vma offset;
2411 int n, m, num;
2412
2413 section_size = sxtlit->size;
2414 BFD_ASSERT (section_size % 8 == 0);
2415 num = section_size / 8;
2416
2417 sgotloc_size = sgotloc->size;
2418 if (sgotloc_size != section_size)
2419 {
2420 (*_bfd_error_handler)
2421 (_("internal inconsistency in size of .got.loc section"));
2422 return -1;
2423 }
2424
2425 table = bfd_malloc (num * sizeof (property_table_entry));
2426 if (table == 0)
2427 return -1;
2428
2429 /* The ".xt.lit.plt" section has the SEC_IN_MEMORY flag set and this
2430 propagates to the output section, where it doesn't really apply and
2431 where it breaks the following call to bfd_malloc_and_get_section. */
2432 sxtlit->flags &= ~SEC_IN_MEMORY;
2433
2434 if (!bfd_malloc_and_get_section (output_bfd, sxtlit, &contents))
2435 {
2436 if (contents != 0)
2437 free (contents);
2438 free (table);
2439 return -1;
2440 }
2441
2442 /* There should never be any relocations left at this point, so this
2443 is quite a bit easier than what is done during relaxation. */
2444
2445 /* Copy the raw contents into a property table array and sort it. */
2446 offset = 0;
2447 for (n = 0; n < num; n++)
2448 {
2449 table[n].address = bfd_get_32 (output_bfd, &contents[offset]);
2450 table[n].size = bfd_get_32 (output_bfd, &contents[offset + 4]);
2451 offset += 8;
2452 }
2453 qsort (table, num, sizeof (property_table_entry), property_table_compare);
2454
2455 for (n = 0; n < num; n++)
2456 {
2457 bfd_boolean remove = FALSE;
2458
2459 if (table[n].size == 0)
2460 remove = TRUE;
2461 else if (n > 0 &&
2462 (table[n-1].address + table[n-1].size == table[n].address))
2463 {
2464 table[n-1].size += table[n].size;
2465 remove = TRUE;
2466 }
2467
2468 if (remove)
2469 {
2470 for (m = n; m < num - 1; m++)
2471 {
2472 table[m].address = table[m+1].address;
2473 table[m].size = table[m+1].size;
2474 }
2475
2476 n--;
2477 num--;
2478 }
2479 }
2480
2481 /* Copy the data back to the raw contents. */
2482 offset = 0;
2483 for (n = 0; n < num; n++)
2484 {
2485 bfd_put_32 (output_bfd, table[n].address, &contents[offset]);
2486 bfd_put_32 (output_bfd, table[n].size, &contents[offset + 4]);
2487 offset += 8;
2488 }
2489
2490 /* Clear the removed bytes. */
2491 if ((bfd_size_type) (num * 8) < section_size)
2492 memset (&contents[num * 8], 0, section_size - num * 8);
2493
2494 if (! bfd_set_section_contents (output_bfd, sxtlit, contents, 0,
2495 section_size))
2496 return -1;
2497
2498 /* Copy the contents to ".got.loc". */
2499 memcpy (sgotloc->contents, contents, section_size);
2500
2501 free (contents);
2502 free (table);
2503 return num;
2504 }
2505
2506
2507 /* Finish up the dynamic sections. */
2508
2509 static bfd_boolean
2510 elf_xtensa_finish_dynamic_sections (bfd *output_bfd,
2511 struct bfd_link_info *info)
2512 {
2513 bfd *dynobj;
2514 asection *sdyn, *srelplt, *sgot, *sxtlit, *sgotloc;
2515 Elf32_External_Dyn *dyncon, *dynconend;
2516 int num_xtlit_entries;
2517
2518 if (! elf_hash_table (info)->dynamic_sections_created)
2519 return TRUE;
2520
2521 dynobj = elf_hash_table (info)->dynobj;
2522 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
2523 BFD_ASSERT (sdyn != NULL);
2524
2525 /* Set the first entry in the global offset table to the address of
2526 the dynamic section. */
2527 sgot = bfd_get_section_by_name (dynobj, ".got");
2528 if (sgot)
2529 {
2530 BFD_ASSERT (sgot->size == 4);
2531 if (sdyn == NULL)
2532 bfd_put_32 (output_bfd, 0, sgot->contents);
2533 else
2534 bfd_put_32 (output_bfd,
2535 sdyn->output_section->vma + sdyn->output_offset,
2536 sgot->contents);
2537 }
2538
2539 srelplt = bfd_get_section_by_name (dynobj, ".rela.plt");
2540 if (srelplt && srelplt->size != 0)
2541 {
2542 asection *sgotplt, *srelgot, *spltlittbl;
2543 int chunk, plt_chunks, plt_entries;
2544 Elf_Internal_Rela irela;
2545 bfd_byte *loc;
2546 unsigned rtld_reloc;
2547
2548 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");;
2549 BFD_ASSERT (srelgot != NULL);
2550
2551 spltlittbl = bfd_get_section_by_name (dynobj, ".xt.lit.plt");
2552 BFD_ASSERT (spltlittbl != NULL);
2553
2554 /* Find the first XTENSA_RTLD relocation. Presumably the rest
2555 of them follow immediately after.... */
2556 for (rtld_reloc = 0; rtld_reloc < srelgot->reloc_count; rtld_reloc++)
2557 {
2558 loc = srelgot->contents + rtld_reloc * sizeof (Elf32_External_Rela);
2559 bfd_elf32_swap_reloca_in (output_bfd, loc, &irela);
2560 if (ELF32_R_TYPE (irela.r_info) == R_XTENSA_RTLD)
2561 break;
2562 }
2563 BFD_ASSERT (rtld_reloc < srelgot->reloc_count);
2564
2565 plt_entries = srelplt->size / sizeof (Elf32_External_Rela);
2566 plt_chunks =
2567 (plt_entries + PLT_ENTRIES_PER_CHUNK - 1) / PLT_ENTRIES_PER_CHUNK;
2568
2569 for (chunk = 0; chunk < plt_chunks; chunk++)
2570 {
2571 int chunk_entries = 0;
2572
2573 sgotplt = elf_xtensa_get_gotplt_section (dynobj, chunk);
2574 BFD_ASSERT (sgotplt != NULL);
2575
2576 /* Emit special RTLD relocations for the first two entries in
2577 each chunk of the .got.plt section. */
2578
2579 loc = srelgot->contents + rtld_reloc * sizeof (Elf32_External_Rela);
2580 bfd_elf32_swap_reloca_in (output_bfd, loc, &irela);
2581 BFD_ASSERT (ELF32_R_TYPE (irela.r_info) == R_XTENSA_RTLD);
2582 irela.r_offset = (sgotplt->output_section->vma
2583 + sgotplt->output_offset);
2584 irela.r_addend = 1; /* tell rtld to set value to resolver function */
2585 bfd_elf32_swap_reloca_out (output_bfd, &irela, loc);
2586 rtld_reloc += 1;
2587 BFD_ASSERT (rtld_reloc <= srelgot->reloc_count);
2588
2589 /* Next literal immediately follows the first. */
2590 loc += sizeof (Elf32_External_Rela);
2591 bfd_elf32_swap_reloca_in (output_bfd, loc, &irela);
2592 BFD_ASSERT (ELF32_R_TYPE (irela.r_info) == R_XTENSA_RTLD);
2593 irela.r_offset = (sgotplt->output_section->vma
2594 + sgotplt->output_offset + 4);
2595 /* Tell rtld to set value to object's link map. */
2596 irela.r_addend = 2;
2597 bfd_elf32_swap_reloca_out (output_bfd, &irela, loc);
2598 rtld_reloc += 1;
2599 BFD_ASSERT (rtld_reloc <= srelgot->reloc_count);
2600
2601 /* Fill in the literal table. */
2602 if (chunk < plt_chunks - 1)
2603 chunk_entries = PLT_ENTRIES_PER_CHUNK;
2604 else
2605 chunk_entries = plt_entries - (chunk * PLT_ENTRIES_PER_CHUNK);
2606
2607 BFD_ASSERT ((unsigned) (chunk + 1) * 8 <= spltlittbl->size);
2608 bfd_put_32 (output_bfd,
2609 sgotplt->output_section->vma + sgotplt->output_offset,
2610 spltlittbl->contents + (chunk * 8) + 0);
2611 bfd_put_32 (output_bfd,
2612 8 + (chunk_entries * 4),
2613 spltlittbl->contents + (chunk * 8) + 4);
2614 }
2615
2616 /* All the dynamic relocations have been emitted at this point.
2617 Make sure the relocation sections are the correct size. */
2618 if (srelgot->size != (sizeof (Elf32_External_Rela)
2619 * srelgot->reloc_count)
2620 || srelplt->size != (sizeof (Elf32_External_Rela)
2621 * srelplt->reloc_count))
2622 abort ();
2623
2624 /* The .xt.lit.plt section has just been modified. This must
2625 happen before the code below which combines adjacent literal
2626 table entries, and the .xt.lit.plt contents have to be forced to
2627 the output here. */
2628 if (! bfd_set_section_contents (output_bfd,
2629 spltlittbl->output_section,
2630 spltlittbl->contents,
2631 spltlittbl->output_offset,
2632 spltlittbl->size))
2633 return FALSE;
2634 /* Clear SEC_HAS_CONTENTS so the contents won't be output again. */
2635 spltlittbl->flags &= ~SEC_HAS_CONTENTS;
2636 }
2637
2638 /* Combine adjacent literal table entries. */
2639 BFD_ASSERT (! info->relocatable);
2640 sxtlit = bfd_get_section_by_name (output_bfd, ".xt.lit");
2641 sgotloc = bfd_get_section_by_name (dynobj, ".got.loc");
2642 BFD_ASSERT (sxtlit && sgotloc);
2643 num_xtlit_entries =
2644 elf_xtensa_combine_prop_entries (output_bfd, sxtlit, sgotloc);
2645 if (num_xtlit_entries < 0)
2646 return FALSE;
2647
2648 dyncon = (Elf32_External_Dyn *) sdyn->contents;
2649 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
2650 for (; dyncon < dynconend; dyncon++)
2651 {
2652 Elf_Internal_Dyn dyn;
2653 const char *name;
2654 asection *s;
2655
2656 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
2657
2658 switch (dyn.d_tag)
2659 {
2660 default:
2661 break;
2662
2663 case DT_XTENSA_GOT_LOC_SZ:
2664 dyn.d_un.d_val = num_xtlit_entries;
2665 break;
2666
2667 case DT_XTENSA_GOT_LOC_OFF:
2668 name = ".got.loc";
2669 goto get_vma;
2670 case DT_PLTGOT:
2671 name = ".got";
2672 goto get_vma;
2673 case DT_JMPREL:
2674 name = ".rela.plt";
2675 get_vma:
2676 s = bfd_get_section_by_name (output_bfd, name);
2677 BFD_ASSERT (s);
2678 dyn.d_un.d_ptr = s->vma;
2679 break;
2680
2681 case DT_PLTRELSZ:
2682 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2683 BFD_ASSERT (s);
2684 dyn.d_un.d_val = s->size;
2685 break;
2686
2687 case DT_RELASZ:
2688 /* Adjust RELASZ to not include JMPREL. This matches what
2689 glibc expects and what is done for several other ELF
2690 targets (e.g., i386, alpha), but the "correct" behavior
2691 seems to be unresolved. Since the linker script arranges
2692 for .rela.plt to follow all other relocation sections, we
2693 don't have to worry about changing the DT_RELA entry. */
2694 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2695 if (s)
2696 dyn.d_un.d_val -= s->size;
2697 break;
2698 }
2699
2700 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2701 }
2702
2703 return TRUE;
2704 }
2705
2706 \f
2707 /* Functions for dealing with the e_flags field. */
2708
2709 /* Merge backend specific data from an object file to the output
2710 object file when linking. */
2711
2712 static bfd_boolean
2713 elf_xtensa_merge_private_bfd_data (bfd *ibfd, bfd *obfd)
2714 {
2715 unsigned out_mach, in_mach;
2716 flagword out_flag, in_flag;
2717
2718 /* Check if we have the same endianess. */
2719 if (!_bfd_generic_verify_endian_match (ibfd, obfd))
2720 return FALSE;
2721
2722 /* Don't even pretend to support mixed-format linking. */
2723 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
2724 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
2725 return FALSE;
2726
2727 out_flag = elf_elfheader (obfd)->e_flags;
2728 in_flag = elf_elfheader (ibfd)->e_flags;
2729
2730 out_mach = out_flag & EF_XTENSA_MACH;
2731 in_mach = in_flag & EF_XTENSA_MACH;
2732 if (out_mach != in_mach)
2733 {
2734 (*_bfd_error_handler)
2735 (_("%B: incompatible machine type. Output is 0x%x. Input is 0x%x"),
2736 ibfd, out_mach, in_mach);
2737 bfd_set_error (bfd_error_wrong_format);
2738 return FALSE;
2739 }
2740
2741 if (! elf_flags_init (obfd))
2742 {
2743 elf_flags_init (obfd) = TRUE;
2744 elf_elfheader (obfd)->e_flags = in_flag;
2745
2746 if (bfd_get_arch (obfd) == bfd_get_arch (ibfd)
2747 && bfd_get_arch_info (obfd)->the_default)
2748 return bfd_set_arch_mach (obfd, bfd_get_arch (ibfd),
2749 bfd_get_mach (ibfd));
2750
2751 return TRUE;
2752 }
2753
2754 if ((out_flag & EF_XTENSA_XT_INSN) != (in_flag & EF_XTENSA_XT_INSN))
2755 elf_elfheader (obfd)->e_flags &= (~ EF_XTENSA_XT_INSN);
2756
2757 if ((out_flag & EF_XTENSA_XT_LIT) != (in_flag & EF_XTENSA_XT_LIT))
2758 elf_elfheader (obfd)->e_flags &= (~ EF_XTENSA_XT_LIT);
2759
2760 return TRUE;
2761 }
2762
2763
2764 static bfd_boolean
2765 elf_xtensa_set_private_flags (bfd *abfd, flagword flags)
2766 {
2767 BFD_ASSERT (!elf_flags_init (abfd)
2768 || elf_elfheader (abfd)->e_flags == flags);
2769
2770 elf_elfheader (abfd)->e_flags |= flags;
2771 elf_flags_init (abfd) = TRUE;
2772
2773 return TRUE;
2774 }
2775
2776
2777 static bfd_boolean
2778 elf_xtensa_print_private_bfd_data (bfd *abfd, void *farg)
2779 {
2780 FILE *f = (FILE *) farg;
2781 flagword e_flags = elf_elfheader (abfd)->e_flags;
2782
2783 fprintf (f, "\nXtensa header:\n");
2784 if ((e_flags & EF_XTENSA_MACH) == E_XTENSA_MACH)
2785 fprintf (f, "\nMachine = Base\n");
2786 else
2787 fprintf (f, "\nMachine Id = 0x%x\n", e_flags & EF_XTENSA_MACH);
2788
2789 fprintf (f, "Insn tables = %s\n",
2790 (e_flags & EF_XTENSA_XT_INSN) ? "true" : "false");
2791
2792 fprintf (f, "Literal tables = %s\n",
2793 (e_flags & EF_XTENSA_XT_LIT) ? "true" : "false");
2794
2795 return _bfd_elf_print_private_bfd_data (abfd, farg);
2796 }
2797
2798
2799 /* Set the right machine number for an Xtensa ELF file. */
2800
2801 static bfd_boolean
2802 elf_xtensa_object_p (bfd *abfd)
2803 {
2804 int mach;
2805 unsigned long arch = elf_elfheader (abfd)->e_flags & EF_XTENSA_MACH;
2806
2807 switch (arch)
2808 {
2809 case E_XTENSA_MACH:
2810 mach = bfd_mach_xtensa;
2811 break;
2812 default:
2813 return FALSE;
2814 }
2815
2816 (void) bfd_default_set_arch_mach (abfd, bfd_arch_xtensa, mach);
2817 return TRUE;
2818 }
2819
2820
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
2823 number. */
2824
2825 static void
2826 elf_xtensa_final_write_processing (bfd *abfd,
2827 bfd_boolean linker ATTRIBUTE_UNUSED)
2828 {
2829 int mach;
2830 unsigned long val;
2831
2832 switch (mach = bfd_get_mach (abfd))
2833 {
2834 case bfd_mach_xtensa:
2835 val = E_XTENSA_MACH;
2836 break;
2837 default:
2838 return;
2839 }
2840
2841 elf_elfheader (abfd)->e_flags &= (~ EF_XTENSA_MACH);
2842 elf_elfheader (abfd)->e_flags |= val;
2843 }
2844
2845
2846 static enum elf_reloc_type_class
2847 elf_xtensa_reloc_type_class (const Elf_Internal_Rela *rela)
2848 {
2849 switch ((int) ELF32_R_TYPE (rela->r_info))
2850 {
2851 case R_XTENSA_RELATIVE:
2852 return reloc_class_relative;
2853 case R_XTENSA_JMP_SLOT:
2854 return reloc_class_plt;
2855 default:
2856 return reloc_class_normal;
2857 }
2858 }
2859
2860 \f
2861 static bfd_boolean
2862 elf_xtensa_discard_info_for_section (bfd *abfd,
2863 struct elf_reloc_cookie *cookie,
2864 struct bfd_link_info *info,
2865 asection *sec)
2866 {
2867 bfd_byte *contents;
2868 bfd_vma section_size;
2869 bfd_vma offset, actual_offset;
2870 size_t removed_bytes = 0;
2871
2872 section_size = sec->size;
2873 if (section_size == 0 || section_size % 8 != 0)
2874 return FALSE;
2875
2876 if (sec->output_section
2877 && bfd_is_abs_section (sec->output_section))
2878 return FALSE;
2879
2880 contents = retrieve_contents (abfd, sec, info->keep_memory);
2881 if (!contents)
2882 return FALSE;
2883
2884 cookie->rels = retrieve_internal_relocs (abfd, sec, info->keep_memory);
2885 if (!cookie->rels)
2886 {
2887 release_contents (sec, contents);
2888 return FALSE;
2889 }
2890
2891 cookie->rel = cookie->rels;
2892 cookie->relend = cookie->rels + sec->reloc_count;
2893
2894 for (offset = 0; offset < section_size; offset += 8)
2895 {
2896 actual_offset = offset - removed_bytes;
2897
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)
2902 {
2903 cookie->rel->r_offset -= removed_bytes;
2904 cookie->rel++;
2905 }
2906
2907 while (cookie->rel < cookie->relend
2908 && cookie->rel->r_offset == offset)
2909 {
2910 if (bfd_elf_reloc_symbol_deleted_p (offset, cookie))
2911 {
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)
2916 {
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);
2922 removed_bytes += 8;
2923 }
2924
2925 /* Remove this relocation. */
2926 cookie->rel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
2927 }
2928
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;
2936 else
2937 cookie->rel->r_offset = 0;
2938
2939 cookie->rel++;
2940 }
2941 }
2942
2943 if (removed_bytes != 0)
2944 {
2945 /* Adjust any remaining relocs (shouldn't be any). */
2946 for (; cookie->rel < cookie->relend; cookie->rel++)
2947 {
2948 if (cookie->rel->r_offset >= removed_bytes)
2949 cookie->rel->r_offset -= removed_bytes;
2950 else
2951 cookie->rel->r_offset = 0;
2952 }
2953
2954 /* Clear the removed bytes. */
2955 memset (&contents[section_size - removed_bytes], 0, removed_bytes);
2956
2957 pin_contents (sec, contents);
2958 pin_internal_relocs (sec, cookie->rels);
2959
2960 /* Shrink size. */
2961 sec->size = section_size - removed_bytes;
2962
2963 if (xtensa_is_littable_section (sec))
2964 {
2965 bfd *dynobj = elf_hash_table (info)->dynobj;
2966 if (dynobj)
2967 {
2968 asection *sgotloc =
2969 bfd_get_section_by_name (dynobj, ".got.loc");
2970 if (sgotloc)
2971 sgotloc->size -= removed_bytes;
2972 }
2973 }
2974 }
2975 else
2976 {
2977 release_contents (sec, contents);
2978 release_internal_relocs (sec, cookie->rels);
2979 }
2980
2981 return (removed_bytes != 0);
2982 }
2983
2984
2985 static bfd_boolean
2986 elf_xtensa_discard_info (bfd *abfd,
2987 struct elf_reloc_cookie *cookie,
2988 struct bfd_link_info *info)
2989 {
2990 asection *sec;
2991 bfd_boolean changed = FALSE;
2992
2993 for (sec = abfd->sections; sec != NULL; sec = sec->next)
2994 {
2995 if (xtensa_is_property_section (sec))
2996 {
2997 if (elf_xtensa_discard_info_for_section (abfd, cookie, info, sec))
2998 changed = TRUE;
2999 }
3000 }
3001
3002 return changed;
3003 }
3004
3005
3006 static bfd_boolean
3007 elf_xtensa_ignore_discarded_relocs (asection *sec)
3008 {
3009 return xtensa_is_property_section (sec);
3010 }
3011
3012 \f
3013 /* Support for core dump NOTE sections. */
3014
3015 static bfd_boolean
3016 elf_xtensa_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
3017 {
3018 int offset;
3019 unsigned int size;
3020
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. */
3023
3024 /* pr_cursig */
3025 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12);
3026
3027 /* pr_pid */
3028 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24);
3029
3030 /* pr_reg */
3031 offset = 72;
3032 size = note->descsz - offset - 4;
3033
3034 /* Make a ".reg/999" section. */
3035 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
3036 size, note->descpos + offset);
3037 }
3038
3039
3040 static bfd_boolean
3041 elf_xtensa_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
3042 {
3043 switch (note->descsz)
3044 {
3045 default:
3046 return FALSE;
3047
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);
3053 }
3054
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. */
3058
3059 {
3060 char *command = elf_tdata (abfd)->core_command;
3061 int n = strlen (command);
3062
3063 if (0 < n && command[n - 1] == ' ')
3064 command[n - 1] = '\0';
3065 }
3066
3067 return TRUE;
3068 }
3069
3070 \f
3071 /* Generic Xtensa configurability stuff. */
3072
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;
3081
3082 static void
3083 init_call_opcodes (void)
3084 {
3085 if (callx0_op == XTENSA_UNDEFINED)
3086 {
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");
3095 }
3096 }
3097
3098
3099 static bfd_boolean
3100 is_indirect_call_opcode (xtensa_opcode opcode)
3101 {
3102 init_call_opcodes ();
3103 return (opcode == callx0_op
3104 || opcode == callx4_op
3105 || opcode == callx8_op
3106 || opcode == callx12_op);
3107 }
3108
3109
3110 static bfd_boolean
3111 is_direct_call_opcode (xtensa_opcode opcode)
3112 {
3113 init_call_opcodes ();
3114 return (opcode == call0_op
3115 || opcode == call4_op
3116 || opcode == call8_op
3117 || opcode == call12_op);
3118 }
3119
3120
3121 static bfd_boolean
3122 is_windowed_call_opcode (xtensa_opcode opcode)
3123 {
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);
3131 }
3132
3133
3134 static xtensa_opcode
3135 get_const16_opcode (void)
3136 {
3137 static bfd_boolean done_lookup = FALSE;
3138 static xtensa_opcode const16_opcode = XTENSA_UNDEFINED;
3139 if (!done_lookup)
3140 {
3141 const16_opcode = xtensa_opcode_lookup (xtensa_default_isa, "const16");
3142 done_lookup = TRUE;
3143 }
3144 return const16_opcode;
3145 }
3146
3147
3148 static xtensa_opcode
3149 get_l32r_opcode (void)
3150 {
3151 static xtensa_opcode l32r_opcode = XTENSA_UNDEFINED;
3152 static bfd_boolean done_lookup = FALSE;
3153
3154 if (!done_lookup)
3155 {
3156 l32r_opcode = xtensa_opcode_lookup (xtensa_default_isa, "l32r");
3157 done_lookup = TRUE;
3158 }
3159 return l32r_opcode;
3160 }
3161
3162
3163 static bfd_vma
3164 l32r_offset (bfd_vma addr, bfd_vma pc)
3165 {
3166 bfd_vma offset;
3167
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);
3172 return offset;
3173 }
3174
3175
3176 static int
3177 get_relocation_opnd (xtensa_opcode opcode, int r_type)
3178 {
3179 xtensa_isa isa = xtensa_default_isa;
3180 int last_immed, last_opnd, opi;
3181
3182 if (opcode == XTENSA_UNDEFINED)
3183 return XTENSA_UNDEFINED;
3184
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--)
3191 {
3192 if (xtensa_operand_is_visible (isa, opcode, opi) == 0)
3193 continue;
3194 if (xtensa_operand_is_PCrelative (isa, opcode, opi) == 1)
3195 {
3196 last_immed = opi;
3197 break;
3198 }
3199 if (last_immed == XTENSA_UNDEFINED
3200 && xtensa_operand_is_register (isa, opcode, opi) == 0)
3201 last_immed = opi;
3202 }
3203 if (last_immed < 0)
3204 return XTENSA_UNDEFINED;
3205
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)
3209 {
3210 int reloc_opnd = r_type - R_XTENSA_OP0;
3211 if (reloc_opnd != last_immed)
3212 return XTENSA_UNDEFINED;
3213 }
3214
3215 return last_immed;
3216 }
3217
3218
3219 int
3220 get_relocation_slot (int r_type)
3221 {
3222 switch (r_type)
3223 {
3224 case R_XTENSA_OP0:
3225 case R_XTENSA_OP1:
3226 case R_XTENSA_OP2:
3227 return 0;
3228
3229 default:
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;
3234 break;
3235 }
3236
3237 return XTENSA_UNDEFINED;
3238 }
3239
3240
3241 /* Get the opcode for a relocation. */
3242
3243 static xtensa_opcode
3244 get_relocation_opcode (bfd *abfd,
3245 asection *sec,
3246 bfd_byte *contents,
3247 Elf_Internal_Rela *irel)
3248 {
3249 static xtensa_insnbuf ibuff = NULL;
3250 static xtensa_insnbuf sbuff = NULL;
3251 xtensa_isa isa = xtensa_default_isa;
3252 xtensa_format fmt;
3253 int slot;
3254
3255 if (contents == NULL)
3256 return XTENSA_UNDEFINED;
3257
3258 if (bfd_get_section_limit (abfd, sec) <= irel->r_offset)
3259 return XTENSA_UNDEFINED;
3260
3261 if (ibuff == NULL)
3262 {
3263 ibuff = xtensa_insnbuf_alloc (isa);
3264 sbuff = xtensa_insnbuf_alloc (isa);
3265 }
3266
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);
3276 }
3277
3278
3279 bfd_boolean
3280 is_l32r_relocation (bfd *abfd,
3281 asection *sec,
3282 bfd_byte *contents,
3283 Elf_Internal_Rela *irel)
3284 {
3285 xtensa_opcode opcode;
3286 if (!is_operand_relocation (ELF32_R_TYPE (irel->r_info)))
3287 return FALSE;
3288 opcode = get_relocation_opcode (abfd, sec, contents, irel);
3289 return (opcode == get_l32r_opcode ());
3290 }
3291
3292
3293 static bfd_size_type
3294 get_asm_simplify_size (bfd_byte *contents,
3295 bfd_size_type content_len,
3296 bfd_size_type offset)
3297 {
3298 bfd_size_type insnlen, size = 0;
3299
3300 /* Decode the size of the next two instructions. */
3301 insnlen = insn_decode_len (contents, content_len, offset);
3302 if (insnlen == 0)
3303 return 0;
3304
3305 size += insnlen;
3306
3307 insnlen = insn_decode_len (contents, content_len, offset + size);
3308 if (insnlen == 0)
3309 return 0;
3310
3311 size += insnlen;
3312 return size;
3313 }
3314
3315
3316 bfd_boolean
3317 is_alt_relocation (int r_type)
3318 {
3319 return (r_type >= R_XTENSA_SLOT0_ALT
3320 && r_type <= R_XTENSA_SLOT14_ALT);
3321 }
3322
3323
3324 bfd_boolean
3325 is_operand_relocation (int r_type)
3326 {
3327 switch (r_type)
3328 {
3329 case R_XTENSA_OP0:
3330 case R_XTENSA_OP1:
3331 case R_XTENSA_OP2:
3332 return TRUE;
3333
3334 default:
3335 if (r_type >= R_XTENSA_SLOT0_OP && r_type <= R_XTENSA_SLOT14_OP)
3336 return TRUE;
3337 if (r_type >= R_XTENSA_SLOT0_ALT && r_type <= R_XTENSA_SLOT14_ALT)
3338 return TRUE;
3339 break;
3340 }
3341
3342 return FALSE;
3343 }
3344
3345
3346 #define MIN_INSN_LENGTH 2
3347
3348 /* Return 0 if it fails to decode. */
3349
3350 bfd_size_type
3351 insn_decode_len (bfd_byte *contents,
3352 bfd_size_type content_len,
3353 bfd_size_type offset)
3354 {
3355 int insn_len;
3356 xtensa_isa isa = xtensa_default_isa;
3357 xtensa_format fmt;
3358 static xtensa_insnbuf ibuff = NULL;
3359
3360 if (offset + MIN_INSN_LENGTH > content_len)
3361 return 0;
3362
3363 if (ibuff == NULL)
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)
3369 return 0;
3370 insn_len = xtensa_format_length (isa, fmt);
3371 if (insn_len == XTENSA_UNDEFINED)
3372 return 0;
3373 return insn_len;
3374 }
3375
3376
3377 /* Decode the opcode for a single slot instruction.
3378 Return 0 if it fails to decode or the instruction is multi-slot. */
3379
3380 xtensa_opcode
3381 insn_decode_opcode (bfd_byte *contents,
3382 bfd_size_type content_len,
3383 bfd_size_type offset,
3384 int slot)
3385 {
3386 xtensa_isa isa = xtensa_default_isa;
3387 xtensa_format fmt;
3388 static xtensa_insnbuf insnbuf = NULL;
3389 static xtensa_insnbuf slotbuf = NULL;
3390
3391 if (offset + MIN_INSN_LENGTH > content_len)
3392 return XTENSA_UNDEFINED;
3393
3394 if (insnbuf == NULL)
3395 {
3396 insnbuf = xtensa_insnbuf_alloc (isa);
3397 slotbuf = xtensa_insnbuf_alloc (isa);
3398 }
3399
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;
3405
3406 if (slot >= xtensa_format_num_slots (isa, fmt))
3407 return XTENSA_UNDEFINED;
3408
3409 xtensa_format_get_slot (isa, fmt, slot, insnbuf, slotbuf);
3410 return xtensa_opcode_decode (isa, fmt, slot, slotbuf);
3411 }
3412
3413
3414 /* The offset is the offset in the contents.
3415 The address is the address of that offset. */
3416
3417 static bfd_boolean
3418 check_branch_target_aligned (bfd_byte *contents,
3419 bfd_size_type content_length,
3420 bfd_vma offset,
3421 bfd_vma address)
3422 {
3423 bfd_size_type insn_len = insn_decode_len (contents, content_length, offset);
3424 if (insn_len == 0)
3425 return FALSE;
3426 return check_branch_target_aligned_address (address, insn_len);
3427 }
3428
3429
3430 static bfd_boolean
3431 check_loop_aligned (bfd_byte *contents,
3432 bfd_size_type content_length,
3433 bfd_vma offset,
3434 bfd_vma address)
3435 {
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)
3441 return FALSE;
3442 BFD_ASSERT (xtensa_opcode_is_loop (xtensa_default_isa, opcode));
3443 if (!xtensa_opcode_is_loop (xtensa_default_isa, opcode))
3444 return FALSE;
3445
3446 loop_len = insn_decode_len (contents, content_length, offset);
3447 BFD_ASSERT (loop_len != 0);
3448 if (loop_len == 0)
3449 return FALSE;
3450
3451 insn_len = insn_decode_len (contents, content_length, offset + loop_len);
3452 BFD_ASSERT (insn_len != 0);
3453 if (insn_len == 0)
3454 return FALSE;
3455
3456 return check_branch_target_aligned_address (address + loop_len, insn_len);
3457 }
3458
3459
3460 static bfd_boolean
3461 check_branch_target_aligned_address (bfd_vma addr, int len)
3462 {
3463 if (len == 8)
3464 return (addr % 8 == 0);
3465 return ((addr >> 2) == ((addr + len - 1) >> 2));
3466 }
3467
3468 \f
3469 /* Instruction widening and narrowing. */
3470
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
3475 can be encoded. */
3476
3477 static xtensa_format *op_single_fmt_table = NULL;
3478
3479
3480 static void
3481 init_op_single_format_table (void)
3482 {
3483 xtensa_isa isa = xtensa_default_isa;
3484 xtensa_insnbuf ibuf;
3485 xtensa_opcode opcode;
3486 xtensa_format fmt;
3487 int num_opcodes;
3488
3489 if (op_single_fmt_table)
3490 return;
3491
3492 ibuf = xtensa_insnbuf_alloc (isa);
3493 num_opcodes = xtensa_isa_num_opcodes (isa);
3494
3495 op_single_fmt_table = (xtensa_format *)
3496 bfd_malloc (sizeof (xtensa_format) * num_opcodes);
3497 for (opcode = 0; opcode < num_opcodes; opcode++)
3498 {
3499 op_single_fmt_table[opcode] = XTENSA_UNDEFINED;
3500 for (fmt = 0; fmt < xtensa_isa_num_formats (isa); fmt++)
3501 {
3502 if (xtensa_format_num_slots (isa, fmt) == 1
3503 && xtensa_opcode_encode (isa, fmt, 0, ibuf, opcode) == 0)
3504 {
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;
3510 }
3511 }
3512 }
3513 xtensa_insnbuf_free (isa, ibuf);
3514 }
3515
3516
3517 static xtensa_format
3518 get_single_format (xtensa_opcode opcode)
3519 {
3520 init_op_single_format_table ();
3521 return op_single_fmt_table[opcode];
3522 }
3523
3524
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. */
3530
3531 struct string_pair
3532 {
3533 const char *wide;
3534 const char *narrow;
3535 };
3536
3537 struct string_pair narrowable[] =
3538 {
3539 { "add", "add.n" },
3540 { "addi", "addi.n" },
3541 { "addmi", "addi.n" },
3542 { "l32i", "l32i.n" },
3543 { "movi", "movi.n" },
3544 { "ret", "ret.n" },
3545 { "retw", "retw.n" },
3546 { "s32i", "s32i.n" },
3547 { "or", "mov.n" } /* special case only when op1 == op2 */
3548 };
3549
3550 struct string_pair widenable[] =
3551 {
3552 { "add", "add.n" },
3553 { "addi", "addi.n" },
3554 { "addmi", "addi.n" },
3555 { "beqz", "beqz.n" },
3556 { "bnez", "bnez.n" },
3557 { "l32i", "l32i.n" },
3558 { "movi", "movi.n" },
3559 { "ret", "ret.n" },
3560 { "retw", "retw.n" },
3561 { "s32i", "s32i.n" },
3562 { "or", "mov.n" } /* special case only when op1 == op2 */
3563 };
3564
3565
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. */
3571
3572 static bfd_boolean
3573 narrow_instruction (bfd_byte *contents,
3574 bfd_size_type content_length,
3575 bfd_size_type offset,
3576 bfd_boolean do_it)
3577 {
3578 xtensa_opcode opcode;
3579 bfd_size_type insn_len, opi;
3580 xtensa_isa isa = xtensa_default_isa;
3581 xtensa_format fmt, o_fmt;
3582
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;
3587
3588 if (insnbuf == NULL)
3589 {
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);
3594 }
3595
3596 BFD_ASSERT (offset < content_length);
3597
3598 if (content_length < 2)
3599 return FALSE;
3600
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)
3607 return FALSE;
3608
3609 if (xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf) != 0)
3610 return FALSE;
3611
3612 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
3613 if (opcode == XTENSA_UNDEFINED)
3614 return FALSE;
3615 insn_len = xtensa_format_length (isa, fmt);
3616 if (insn_len > content_length)
3617 return FALSE;
3618
3619 for (opi = 0; opi < (sizeof (narrowable)/sizeof (struct string_pair)); ++opi)
3620 {
3621 bfd_boolean is_or = (strcmp ("or", narrowable[opi].wide) == 0);
3622
3623 if (opcode == xtensa_opcode_lookup (isa, narrowable[opi].wide))
3624 {
3625 uint32 value, newval;
3626 int i, operand_count, o_operand_count;
3627 xtensa_opcode o_opcode;
3628
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;
3632
3633 o_opcode = xtensa_opcode_lookup (isa, narrowable[opi].narrow);
3634 if (o_opcode == XTENSA_UNDEFINED)
3635 return FALSE;
3636 o_fmt = get_single_format (o_opcode);
3637 if (o_fmt == XTENSA_UNDEFINED)
3638 return FALSE;
3639
3640 if (xtensa_format_length (isa, fmt) != 3
3641 || xtensa_format_length (isa, o_fmt) != 2)
3642 return FALSE;
3643
3644 xtensa_format_encode (isa, o_fmt, o_insnbuf);
3645 operand_count = xtensa_opcode_num_operands (isa, opcode);
3646 o_operand_count = xtensa_opcode_num_operands (isa, o_opcode);
3647
3648 if (xtensa_opcode_encode (isa, o_fmt, 0, o_slotbuf, o_opcode) != 0)
3649 return FALSE;
3650
3651 if (!is_or)
3652 {
3653 if (xtensa_opcode_num_operands (isa, o_opcode) != operand_count)
3654 return FALSE;
3655 }
3656 else
3657 {
3658 uint32 rawval0, rawval1, rawval2;
3659
3660 if (o_operand_count + 1 != operand_count)
3661 return FALSE;
3662 if (xtensa_operand_get_field (isa, opcode, 0,
3663 fmt, 0, slotbuf, &rawval0) != 0)
3664 return FALSE;
3665 if (xtensa_operand_get_field (isa, opcode, 1,
3666 fmt, 0, slotbuf, &rawval1) != 0)
3667 return FALSE;
3668 if (xtensa_operand_get_field (isa, opcode, 2,
3669 fmt, 0, slotbuf, &rawval2) != 0)
3670 return FALSE;
3671
3672 if (rawval1 != rawval2)
3673 return FALSE;
3674 if (rawval0 == rawval1) /* it is a nop */
3675 return FALSE;
3676 }
3677
3678 for (i = 0; i < o_operand_count; ++i)
3679 {
3680 if (xtensa_operand_get_field (isa, opcode, i, fmt, 0,
3681 slotbuf, &value)
3682 || xtensa_operand_decode (isa, opcode, i, &value))
3683 return FALSE;
3684
3685 /* PC-relative branches need adjustment, but
3686 the PC-rel operand will always have a relocation. */
3687 newval = value;
3688 if (xtensa_operand_do_reloc (isa, o_opcode, i, &newval,
3689 self_address)
3690 || xtensa_operand_encode (isa, o_opcode, i, &newval)
3691 || xtensa_operand_set_field (isa, o_opcode, i, o_fmt, 0,
3692 o_slotbuf, newval))
3693 return FALSE;
3694 }
3695
3696 if (xtensa_format_set_slot (isa, o_fmt, 0,
3697 o_insnbuf, o_slotbuf) != 0)
3698 return FALSE;
3699
3700 if (do_it)
3701 xtensa_insnbuf_to_chars (isa, o_insnbuf, contents + offset,
3702 content_length - offset);
3703 return TRUE;
3704 }
3705 }
3706 return FALSE;
3707 }
3708
3709
3710 /* Attempt to widen an instruction. Return true if the widening is
3711 valid. If the do_it parameter is non-zero, then the action should
3712 be performed inplace into the contents. Otherwise, do not modify
3713 the contents. The set of valid widenings are specified by a string
3714 table but require some special case operand checks in some
3715 cases. */
3716
3717 static bfd_boolean
3718 widen_instruction (bfd_byte *contents,
3719 bfd_size_type content_length,
3720 bfd_size_type offset,
3721 bfd_boolean do_it)
3722 {
3723 xtensa_opcode opcode;
3724 bfd_size_type insn_len, opi;
3725 xtensa_isa isa = xtensa_default_isa;
3726 xtensa_format fmt, o_fmt;
3727
3728 static xtensa_insnbuf insnbuf = NULL;
3729 static xtensa_insnbuf slotbuf = NULL;
3730 static xtensa_insnbuf o_insnbuf = NULL;
3731 static xtensa_insnbuf o_slotbuf = NULL;
3732
3733 if (insnbuf == NULL)
3734 {
3735 insnbuf = xtensa_insnbuf_alloc (isa);
3736 slotbuf = xtensa_insnbuf_alloc (isa);
3737 o_insnbuf = xtensa_insnbuf_alloc (isa);
3738 o_slotbuf = xtensa_insnbuf_alloc (isa);
3739 }
3740
3741 BFD_ASSERT (offset < content_length);
3742
3743 if (content_length < 2)
3744 return FALSE;
3745
3746 /* We will hand code a few of these for a little while.
3747 These have all been specified in the assembler aleady. */
3748 xtensa_insnbuf_from_chars (isa, insnbuf, &contents[offset],
3749 content_length - offset);
3750 fmt = xtensa_format_decode (isa, insnbuf);
3751 if (xtensa_format_num_slots (isa, fmt) != 1)
3752 return FALSE;
3753
3754 if (xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf) != 0)
3755 return FALSE;
3756
3757 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
3758 if (opcode == XTENSA_UNDEFINED)
3759 return FALSE;
3760 insn_len = xtensa_format_length (isa, fmt);
3761 if (insn_len > content_length)
3762 return FALSE;
3763
3764 for (opi = 0; opi < (sizeof (widenable)/sizeof (struct string_pair)); ++opi)
3765 {
3766 bfd_boolean is_or = (strcmp ("or", widenable[opi].wide) == 0);
3767 bfd_boolean is_branch = (strcmp ("beqz", widenable[opi].wide) == 0
3768 || strcmp ("bnez", widenable[opi].wide) == 0);
3769
3770 if (opcode == xtensa_opcode_lookup (isa, widenable[opi].narrow))
3771 {
3772 uint32 value, newval;
3773 int i, operand_count, o_operand_count, check_operand_count;
3774 xtensa_opcode o_opcode;
3775
3776 /* Address does not matter in this case. We might need to fix it
3777 to handle branches/jumps. */
3778 bfd_vma self_address = 0;
3779
3780 o_opcode = xtensa_opcode_lookup (isa, widenable[opi].wide);
3781 if (o_opcode == XTENSA_UNDEFINED)
3782 return FALSE;
3783 o_fmt = get_single_format (o_opcode);
3784 if (o_fmt == XTENSA_UNDEFINED)
3785 return FALSE;
3786
3787 if (xtensa_format_length (isa, fmt) != 2
3788 || xtensa_format_length (isa, o_fmt) != 3)
3789 return FALSE;
3790
3791 xtensa_format_encode (isa, o_fmt, o_insnbuf);
3792 operand_count = xtensa_opcode_num_operands (isa, opcode);
3793 o_operand_count = xtensa_opcode_num_operands (isa, o_opcode);
3794 check_operand_count = o_operand_count;
3795
3796 if (xtensa_opcode_encode (isa, o_fmt, 0, o_slotbuf, o_opcode) != 0)
3797 return FALSE;
3798
3799 if (!is_or)
3800 {
3801 if (xtensa_opcode_num_operands (isa, o_opcode) != operand_count)
3802 return FALSE;
3803 }
3804 else
3805 {
3806 uint32 rawval0, rawval1;
3807
3808 if (o_operand_count != operand_count + 1)
3809 return FALSE;
3810 if (xtensa_operand_get_field (isa, opcode, 0,
3811 fmt, 0, slotbuf, &rawval0) != 0)
3812 return FALSE;
3813 if (xtensa_operand_get_field (isa, opcode, 1,
3814 fmt, 0, slotbuf, &rawval1) != 0)
3815 return FALSE;
3816 if (rawval0 == rawval1) /* it is a nop */
3817 return FALSE;
3818 }
3819 if (is_branch)
3820 check_operand_count--;
3821
3822 for (i = 0; i < check_operand_count; ++i)
3823 {
3824 int new_i = i;
3825 if (is_or && i == o_operand_count - 1)
3826 new_i = i - 1;
3827 if (xtensa_operand_get_field (isa, opcode, new_i, fmt, 0,
3828 slotbuf, &value)
3829 || xtensa_operand_decode (isa, opcode, new_i, &value))
3830 return FALSE;
3831
3832 /* PC-relative branches need adjustment, but
3833 the PC-rel operand will always have a relocation. */
3834 newval = value;
3835 if (xtensa_operand_do_reloc (isa, o_opcode, i, &newval,
3836 self_address)
3837 || xtensa_operand_encode (isa, o_opcode, i, &newval)
3838 || xtensa_operand_set_field (isa, o_opcode, i, o_fmt, 0,
3839 o_slotbuf, newval))
3840 return FALSE;
3841 }
3842
3843 if (xtensa_format_set_slot (isa, o_fmt, 0, o_insnbuf, o_slotbuf))
3844 return FALSE;
3845
3846 if (do_it)
3847 xtensa_insnbuf_to_chars (isa, o_insnbuf, contents + offset,
3848 content_length - offset);
3849 return TRUE;
3850 }
3851 }
3852 return FALSE;
3853 }
3854
3855 \f
3856 /* Code for transforming CALLs at link-time. */
3857
3858 static bfd_reloc_status_type
3859 elf_xtensa_do_asm_simplify (bfd_byte *contents,
3860 bfd_vma address,
3861 bfd_vma content_length,
3862 char **error_message)
3863 {
3864 static xtensa_insnbuf insnbuf = NULL;
3865 static xtensa_insnbuf slotbuf = NULL;
3866 xtensa_format core_format = XTENSA_UNDEFINED;
3867 xtensa_opcode opcode;
3868 xtensa_opcode direct_call_opcode;
3869 xtensa_isa isa = xtensa_default_isa;
3870 bfd_byte *chbuf = contents + address;
3871 int opn;
3872
3873 if (insnbuf == NULL)
3874 {
3875 insnbuf = xtensa_insnbuf_alloc (isa);
3876 slotbuf = xtensa_insnbuf_alloc (isa);
3877 }
3878
3879 if (content_length < address)
3880 {
3881 *error_message = _("Attempt to convert L32R/CALLX to CALL failed");
3882 return bfd_reloc_other;
3883 }
3884
3885 opcode = get_expanded_call_opcode (chbuf, content_length - address, 0);
3886 direct_call_opcode = swap_callx_for_call_opcode (opcode);
3887 if (direct_call_opcode == XTENSA_UNDEFINED)
3888 {
3889 *error_message = _("Attempt to convert L32R/CALLX to CALL failed");
3890 return bfd_reloc_other;
3891 }
3892
3893 /* Assemble a NOP ("or a1, a1, a1") into the 0 byte offset. */
3894 core_format = xtensa_format_lookup (isa, "x24");
3895 opcode = xtensa_opcode_lookup (isa, "or");
3896 xtensa_opcode_encode (isa, core_format, 0, slotbuf, opcode);
3897 for (opn = 0; opn < 3; opn++)
3898 {
3899 uint32 regno = 1;
3900 xtensa_operand_encode (isa, opcode, opn, &regno);
3901 xtensa_operand_set_field (isa, opcode, opn, core_format, 0,
3902 slotbuf, regno);
3903 }
3904 xtensa_format_encode (isa, core_format, insnbuf);
3905 xtensa_format_set_slot (isa, core_format, 0, insnbuf, slotbuf);
3906 xtensa_insnbuf_to_chars (isa, insnbuf, chbuf, content_length - address);
3907
3908 /* Assemble a CALL ("callN 0") into the 3 byte offset. */
3909 xtensa_opcode_encode (isa, core_format, 0, slotbuf, direct_call_opcode);
3910 xtensa_operand_set_field (isa, opcode, 0, core_format, 0, slotbuf, 0);
3911
3912 xtensa_format_encode (isa, core_format, insnbuf);
3913 xtensa_format_set_slot (isa, core_format, 0, insnbuf, slotbuf);
3914 xtensa_insnbuf_to_chars (isa, insnbuf, chbuf + 3,
3915 content_length - address - 3);
3916
3917 return bfd_reloc_ok;
3918 }
3919
3920
3921 static bfd_reloc_status_type
3922 contract_asm_expansion (bfd_byte *contents,
3923 bfd_vma content_length,
3924 Elf_Internal_Rela *irel,
3925 char **error_message)
3926 {
3927 bfd_reloc_status_type retval =
3928 elf_xtensa_do_asm_simplify (contents, irel->r_offset, content_length,
3929 error_message);
3930
3931 if (retval != bfd_reloc_ok)
3932 return bfd_reloc_dangerous;
3933
3934 /* Update the irel->r_offset field so that the right immediate and
3935 the right instruction are modified during the relocation. */
3936 irel->r_offset += 3;
3937 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), R_XTENSA_SLOT0_OP);
3938 return bfd_reloc_ok;
3939 }
3940
3941
3942 static xtensa_opcode
3943 swap_callx_for_call_opcode (xtensa_opcode opcode)
3944 {
3945 init_call_opcodes ();
3946
3947 if (opcode == callx0_op) return call0_op;
3948 if (opcode == callx4_op) return call4_op;
3949 if (opcode == callx8_op) return call8_op;
3950 if (opcode == callx12_op) return call12_op;
3951
3952 /* Return XTENSA_UNDEFINED if the opcode is not an indirect call. */
3953 return XTENSA_UNDEFINED;
3954 }
3955
3956
3957 /* Check if "buf" is pointing to a "L32R aN; CALLX aN" or "CONST16 aN;
3958 CONST16 aN; CALLX aN" sequence, and if so, return the CALLX opcode.
3959 If not, return XTENSA_UNDEFINED. */
3960
3961 #define L32R_TARGET_REG_OPERAND 0
3962 #define CONST16_TARGET_REG_OPERAND 0
3963 #define CALLN_SOURCE_OPERAND 0
3964
3965 static xtensa_opcode
3966 get_expanded_call_opcode (bfd_byte *buf, int bufsize, bfd_boolean *p_uses_l32r)
3967 {
3968 static xtensa_insnbuf insnbuf = NULL;
3969 static xtensa_insnbuf slotbuf = NULL;
3970 xtensa_format fmt;
3971 xtensa_opcode opcode;
3972 xtensa_isa isa = xtensa_default_isa;
3973 uint32 regno, const16_regno, call_regno;
3974 int offset = 0;
3975
3976 if (insnbuf == NULL)
3977 {
3978 insnbuf = xtensa_insnbuf_alloc (isa);
3979 slotbuf = xtensa_insnbuf_alloc (isa);
3980 }
3981
3982 xtensa_insnbuf_from_chars (isa, insnbuf, buf, bufsize);
3983 fmt = xtensa_format_decode (isa, insnbuf);
3984 if (fmt == XTENSA_UNDEFINED
3985 || xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf))
3986 return XTENSA_UNDEFINED;
3987
3988 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
3989 if (opcode == XTENSA_UNDEFINED)
3990 return XTENSA_UNDEFINED;
3991
3992 if (opcode == get_l32r_opcode ())
3993 {
3994 if (p_uses_l32r)
3995 *p_uses_l32r = TRUE;
3996 if (xtensa_operand_get_field (isa, opcode, L32R_TARGET_REG_OPERAND,
3997 fmt, 0, slotbuf, &regno)
3998 || xtensa_operand_decode (isa, opcode, L32R_TARGET_REG_OPERAND,
3999 &regno))
4000 return XTENSA_UNDEFINED;
4001 }
4002 else if (opcode == get_const16_opcode ())
4003 {
4004 if (p_uses_l32r)
4005 *p_uses_l32r = FALSE;
4006 if (xtensa_operand_get_field (isa, opcode, CONST16_TARGET_REG_OPERAND,
4007 fmt, 0, slotbuf, &regno)
4008 || xtensa_operand_decode (isa, opcode, CONST16_TARGET_REG_OPERAND,
4009 &regno))
4010 return XTENSA_UNDEFINED;
4011
4012 /* Check that the next instruction is also CONST16. */
4013 offset += xtensa_format_length (isa, fmt);
4014 xtensa_insnbuf_from_chars (isa, insnbuf, buf + offset, bufsize - offset);
4015 fmt = xtensa_format_decode (isa, insnbuf);
4016 if (fmt == XTENSA_UNDEFINED
4017 || xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf))
4018 return XTENSA_UNDEFINED;
4019 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
4020 if (opcode != get_const16_opcode ())
4021 return XTENSA_UNDEFINED;
4022
4023 if (xtensa_operand_get_field (isa, opcode, CONST16_TARGET_REG_OPERAND,
4024 fmt, 0, slotbuf, &const16_regno)
4025 || xtensa_operand_decode (isa, opcode, CONST16_TARGET_REG_OPERAND,
4026 &const16_regno)
4027 || const16_regno != regno)
4028 return XTENSA_UNDEFINED;
4029 }
4030 else
4031 return XTENSA_UNDEFINED;
4032
4033 /* Next instruction should be an CALLXn with operand 0 == regno. */
4034 offset += xtensa_format_length (isa, fmt);
4035 xtensa_insnbuf_from_chars (isa, insnbuf, buf + offset, bufsize - offset);
4036 fmt = xtensa_format_decode (isa, insnbuf);
4037 if (fmt == XTENSA_UNDEFINED
4038 || xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf))
4039 return XTENSA_UNDEFINED;
4040 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
4041 if (opcode == XTENSA_UNDEFINED
4042 || !is_indirect_call_opcode (opcode))
4043 return XTENSA_UNDEFINED;
4044
4045 if (xtensa_operand_get_field (isa, opcode, CALLN_SOURCE_OPERAND,
4046 fmt, 0, slotbuf, &call_regno)
4047 || xtensa_operand_decode (isa, opcode, CALLN_SOURCE_OPERAND,
4048 &call_regno))
4049 return XTENSA_UNDEFINED;
4050
4051 if (call_regno != regno)
4052 return XTENSA_UNDEFINED;
4053
4054 return opcode;
4055 }
4056
4057 \f
4058 /* Data structures used during relaxation. */
4059
4060 /* r_reloc: relocation values. */
4061
4062 /* Through the relaxation process, we need to keep track of the values
4063 that will result from evaluating relocations. The standard ELF
4064 relocation structure is not sufficient for this purpose because we're
4065 operating on multiple input files at once, so we need to know which
4066 input file a relocation refers to. The r_reloc structure thus
4067 records both the input file (bfd) and ELF relocation.
4068
4069 For efficiency, an r_reloc also contains a "target_offset" field to
4070 cache the target-section-relative offset value that is represented by
4071 the relocation.
4072
4073 The r_reloc also contains a virtual offset that allows multiple
4074 inserted literals to be placed at the same "address" with
4075 different offsets. */
4076
4077 typedef struct r_reloc_struct r_reloc;
4078
4079 struct r_reloc_struct
4080 {
4081 bfd *abfd;
4082 Elf_Internal_Rela rela;
4083 bfd_vma target_offset;
4084 bfd_vma virtual_offset;
4085 };
4086
4087
4088 /* The r_reloc structure is included by value in literal_value, but not
4089 every literal_value has an associated relocation -- some are simple
4090 constants. In such cases, we set all the fields in the r_reloc
4091 struct to zero. The r_reloc_is_const function should be used to
4092 detect this case. */
4093
4094 static bfd_boolean
4095 r_reloc_is_const (const r_reloc *r_rel)
4096 {
4097 return (r_rel->abfd == NULL);
4098 }
4099
4100
4101 static bfd_vma
4102 r_reloc_get_target_offset (const r_reloc *r_rel)
4103 {
4104 bfd_vma target_offset;
4105 unsigned long r_symndx;
4106
4107 BFD_ASSERT (!r_reloc_is_const (r_rel));
4108 r_symndx = ELF32_R_SYM (r_rel->rela.r_info);
4109 target_offset = get_elf_r_symndx_offset (r_rel->abfd, r_symndx);
4110 return (target_offset + r_rel->rela.r_addend);
4111 }
4112
4113
4114 static struct elf_link_hash_entry *
4115 r_reloc_get_hash_entry (const r_reloc *r_rel)
4116 {
4117 unsigned long r_symndx = ELF32_R_SYM (r_rel->rela.r_info);
4118 return get_elf_r_symndx_hash_entry (r_rel->abfd, r_symndx);
4119 }
4120
4121
4122 static asection *
4123 r_reloc_get_section (const r_reloc *r_rel)
4124 {
4125 unsigned long r_symndx = ELF32_R_SYM (r_rel->rela.r_info);
4126 return get_elf_r_symndx_section (r_rel->abfd, r_symndx);
4127 }
4128
4129
4130 static bfd_boolean
4131 r_reloc_is_defined (const r_reloc *r_rel)
4132 {
4133 asection *sec;
4134 if (r_rel == NULL)
4135 return FALSE;
4136
4137 sec = r_reloc_get_section (r_rel);
4138 if (sec == bfd_abs_section_ptr
4139 || sec == bfd_com_section_ptr
4140 || sec == bfd_und_section_ptr)
4141 return FALSE;
4142 return TRUE;
4143 }
4144
4145
4146 static void
4147 r_reloc_init (r_reloc *r_rel,
4148 bfd *abfd,
4149 Elf_Internal_Rela *irel,
4150 bfd_byte *contents,
4151 bfd_size_type content_length)
4152 {
4153 int r_type;
4154 reloc_howto_type *howto;
4155
4156 if (irel)
4157 {
4158 r_rel->rela = *irel;
4159 r_rel->abfd = abfd;
4160 r_rel->target_offset = r_reloc_get_target_offset (r_rel);
4161 r_rel->virtual_offset = 0;
4162 r_type = ELF32_R_TYPE (r_rel->rela.r_info);
4163 howto = &elf_howto_table[r_type];
4164 if (howto->partial_inplace)
4165 {
4166 bfd_vma inplace_val;
4167 BFD_ASSERT (r_rel->rela.r_offset < content_length);
4168
4169 inplace_val = bfd_get_32 (abfd, &contents[r_rel->rela.r_offset]);
4170 r_rel->target_offset += inplace_val;
4171 }
4172 }
4173 else
4174 memset (r_rel, 0, sizeof (r_reloc));
4175 }
4176
4177
4178 #if DEBUG
4179
4180 static void
4181 print_r_reloc (FILE *fp, const r_reloc *r_rel)
4182 {
4183 if (r_reloc_is_defined (r_rel))
4184 {
4185 asection *sec = r_reloc_get_section (r_rel);
4186 fprintf (fp, " %s(%s + ", sec->owner->filename, sec->name);
4187 }
4188 else if (r_reloc_get_hash_entry (r_rel))
4189 fprintf (fp, " %s + ", r_reloc_get_hash_entry (r_rel)->root.root.string);
4190 else
4191 fprintf (fp, " ?? + ");
4192
4193 fprintf_vma (fp, r_rel->target_offset);
4194 if (r_rel->virtual_offset)
4195 {
4196 fprintf (fp, " + ");
4197 fprintf_vma (fp, r_rel->virtual_offset);
4198 }
4199
4200 fprintf (fp, ")");
4201 }
4202
4203 #endif /* DEBUG */
4204
4205 \f
4206 /* source_reloc: relocations that reference literals. */
4207
4208 /* To determine whether literals can be coalesced, we need to first
4209 record all the relocations that reference the literals. The
4210 source_reloc structure below is used for this purpose. The
4211 source_reloc entries are kept in a per-literal-section array, sorted
4212 by offset within the literal section (i.e., target offset).
4213
4214 The source_sec and r_rel.rela.r_offset fields identify the source of
4215 the relocation. The r_rel field records the relocation value, i.e.,
4216 the offset of the literal being referenced. The opnd field is needed
4217 to determine the range of the immediate field to which the relocation
4218 applies, so we can determine whether another literal with the same
4219 value is within range. The is_null field is true when the relocation
4220 is being removed (e.g., when an L32R is being removed due to a CALLX
4221 that is converted to a direct CALL). */
4222
4223 typedef struct source_reloc_struct source_reloc;
4224
4225 struct source_reloc_struct
4226 {
4227 asection *source_sec;
4228 r_reloc r_rel;
4229 xtensa_opcode opcode;
4230 int opnd;
4231 bfd_boolean is_null;
4232 bfd_boolean is_abs_literal;
4233 };
4234
4235
4236 static void
4237 init_source_reloc (source_reloc *reloc,
4238 asection *source_sec,
4239 const r_reloc *r_rel,
4240 xtensa_opcode opcode,
4241 int opnd,
4242 bfd_boolean is_abs_literal)
4243 {
4244 reloc->source_sec = source_sec;
4245 reloc->r_rel = *r_rel;
4246 reloc->opcode = opcode;
4247 reloc->opnd = opnd;
4248 reloc->is_null = FALSE;
4249 reloc->is_abs_literal = is_abs_literal;
4250 }
4251
4252
4253 /* Find the source_reloc for a particular source offset and relocation
4254 type. Note that the array is sorted by _target_ offset, so this is
4255 just a linear search. */
4256
4257 static source_reloc *
4258 find_source_reloc (source_reloc *src_relocs,
4259 int src_count,
4260 asection *sec,
4261 Elf_Internal_Rela *irel)
4262 {
4263 int i;
4264
4265 for (i = 0; i < src_count; i++)
4266 {
4267 if (src_relocs[i].source_sec == sec
4268 && src_relocs[i].r_rel.rela.r_offset == irel->r_offset
4269 && (ELF32_R_TYPE (src_relocs[i].r_rel.rela.r_info)
4270 == ELF32_R_TYPE (irel->r_info)))
4271 return &src_relocs[i];
4272 }
4273
4274 return NULL;
4275 }
4276
4277
4278 static int
4279 source_reloc_compare (const void *ap, const void *bp)
4280 {
4281 const source_reloc *a = (const source_reloc *) ap;
4282 const source_reloc *b = (const source_reloc *) bp;
4283
4284 if (a->r_rel.target_offset != b->r_rel.target_offset)
4285 return (a->r_rel.target_offset - b->r_rel.target_offset);
4286
4287 /* We don't need to sort on these criteria for correctness,
4288 but enforcing a more strict ordering prevents unstable qsort
4289 from behaving differently with different implementations.
4290 Without the code below we get correct but different results
4291 on Solaris 2.7 and 2.8. We would like to always produce the
4292 same results no matter the host. */
4293
4294 if ((!a->is_null) - (!b->is_null))
4295 return ((!a->is_null) - (!b->is_null));
4296 return internal_reloc_compare (&a->r_rel.rela, &b->r_rel.rela);
4297 }
4298
4299 \f
4300 /* Literal values and value hash tables. */
4301
4302 /* Literals with the same value can be coalesced. The literal_value
4303 structure records the value of a literal: the "r_rel" field holds the
4304 information from the relocation on the literal (if there is one) and
4305 the "value" field holds the contents of the literal word itself.
4306
4307 The value_map structure records a literal value along with the
4308 location of a literal holding that value. The value_map hash table
4309 is indexed by the literal value, so that we can quickly check if a
4310 particular literal value has been seen before and is thus a candidate
4311 for coalescing. */
4312
4313 typedef struct literal_value_struct literal_value;
4314 typedef struct value_map_struct value_map;
4315 typedef struct value_map_hash_table_struct value_map_hash_table;
4316
4317 struct literal_value_struct
4318 {
4319 r_reloc r_rel;
4320 unsigned long value;
4321 bfd_boolean is_abs_literal;
4322 };
4323
4324 struct value_map_struct
4325 {
4326 literal_value val; /* The literal value. */
4327 r_reloc loc; /* Location of the literal. */
4328 value_map *next;
4329 };
4330
4331 struct value_map_hash_table_struct
4332 {
4333 unsigned bucket_count;
4334 value_map **buckets;
4335 unsigned count;
4336 bfd_boolean has_last_loc;
4337 r_reloc last_loc;
4338 };
4339
4340
4341 static void
4342 init_literal_value (literal_value *lit,
4343 const r_reloc *r_rel,
4344 unsigned long value,
4345 bfd_boolean is_abs_literal)
4346 {
4347 lit->r_rel = *r_rel;
4348 lit->value = value;
4349 lit->is_abs_literal = is_abs_literal;
4350 }
4351
4352
4353 static bfd_boolean
4354 literal_value_equal (const literal_value *src1,
4355 const literal_value *src2,
4356 bfd_boolean final_static_link)
4357 {
4358 struct elf_link_hash_entry *h1, *h2;
4359
4360 if (r_reloc_is_const (&src1->r_rel) != r_reloc_is_const (&src2->r_rel))
4361 return FALSE;
4362
4363 if (r_reloc_is_const (&src1->r_rel))
4364 return (src1->value == src2->value);
4365
4366 if (ELF32_R_TYPE (src1->r_rel.rela.r_info)
4367 != ELF32_R_TYPE (src2->r_rel.rela.r_info))
4368 return FALSE;
4369
4370 if (src1->r_rel.target_offset != src2->r_rel.target_offset)
4371 return FALSE;
4372
4373 if (src1->r_rel.virtual_offset != src2->r_rel.virtual_offset)
4374 return FALSE;
4375
4376 if (src1->value != src2->value)
4377 return FALSE;
4378
4379 /* Now check for the same section (if defined) or the same elf_hash
4380 (if undefined or weak). */
4381 h1 = r_reloc_get_hash_entry (&src1->r_rel);
4382 h2 = r_reloc_get_hash_entry (&src2->r_rel);
4383 if (r_reloc_is_defined (&src1->r_rel)
4384 && (final_static_link
4385 || ((!h1 || h1->root.type != bfd_link_hash_defweak)
4386 && (!h2 || h2->root.type != bfd_link_hash_defweak))))
4387 {
4388 if (r_reloc_get_section (&src1->r_rel)
4389 != r_reloc_get_section (&src2->r_rel))
4390 return FALSE;
4391 }
4392 else
4393 {
4394 /* Require that the hash entries (i.e., symbols) be identical. */
4395 if (h1 != h2 || h1 == 0)
4396 return FALSE;
4397 }
4398
4399 if (src1->is_abs_literal != src2->is_abs_literal)
4400 return FALSE;
4401
4402 return TRUE;
4403 }
4404
4405
4406 /* Must be power of 2. */
4407 #define INITIAL_HASH_RELOC_BUCKET_COUNT 1024
4408
4409 static value_map_hash_table *
4410 value_map_hash_table_init (void)
4411 {
4412 value_map_hash_table *values;
4413
4414 values = (value_map_hash_table *)
4415 bfd_zmalloc (sizeof (value_map_hash_table));
4416 values->bucket_count = INITIAL_HASH_RELOC_BUCKET_COUNT;
4417 values->count = 0;
4418 values->buckets = (value_map **)
4419 bfd_zmalloc (sizeof (value_map *) * values->bucket_count);
4420 if (values->buckets == NULL)
4421 {
4422 free (values);
4423 return NULL;
4424 }
4425 values->has_last_loc = FALSE;
4426
4427 return values;
4428 }
4429
4430
4431 static void
4432 value_map_hash_table_delete (value_map_hash_table *table)
4433 {
4434 free (table->buckets);
4435 free (table);
4436 }
4437
4438
4439 static unsigned
4440 hash_bfd_vma (bfd_vma val)
4441 {
4442 return (val >> 2) + (val >> 10);
4443 }
4444
4445
4446 static unsigned
4447 literal_value_hash (const literal_value *src)
4448 {
4449 unsigned hash_val;
4450
4451 hash_val = hash_bfd_vma (src->value);
4452 if (!r_reloc_is_const (&src->r_rel))
4453 {
4454 void *sec_or_hash;
4455
4456 hash_val += hash_bfd_vma (src->is_abs_literal * 1000);
4457 hash_val += hash_bfd_vma (src->r_rel.target_offset);
4458 hash_val += hash_bfd_vma (src->r_rel.virtual_offset);
4459
4460 /* Now check for the same section and the same elf_hash. */
4461 if (r_reloc_is_defined (&src->r_rel))
4462 sec_or_hash = r_reloc_get_section (&src->r_rel);
4463 else
4464 sec_or_hash = r_reloc_get_hash_entry (&src->r_rel);
4465 hash_val += hash_bfd_vma ((bfd_vma) (size_t) sec_or_hash);
4466 }
4467 return hash_val;
4468 }
4469
4470
4471 /* Check if the specified literal_value has been seen before. */
4472
4473 static value_map *
4474 value_map_get_cached_value (value_map_hash_table *map,
4475 const literal_value *val,
4476 bfd_boolean final_static_link)
4477 {
4478 value_map *map_e;
4479 value_map *bucket;
4480 unsigned idx;
4481
4482 idx = literal_value_hash (val);
4483 idx = idx & (map->bucket_count - 1);
4484 bucket = map->buckets[idx];
4485 for (map_e = bucket; map_e; map_e = map_e->next)
4486 {
4487 if (literal_value_equal (&map_e->val, val, final_static_link))
4488 return map_e;
4489 }
4490 return NULL;
4491 }
4492
4493
4494 /* Record a new literal value. It is illegal to call this if VALUE
4495 already has an entry here. */
4496
4497 static value_map *
4498 add_value_map (value_map_hash_table *map,
4499 const literal_value *val,
4500 const r_reloc *loc,
4501 bfd_boolean final_static_link)
4502 {
4503 value_map **bucket_p;
4504 unsigned idx;
4505
4506 value_map *val_e = (value_map *) bfd_zmalloc (sizeof (value_map));
4507 if (val_e == NULL)
4508 {
4509 bfd_set_error (bfd_error_no_memory);
4510 return NULL;
4511 }
4512
4513 BFD_ASSERT (!value_map_get_cached_value (map, val, final_static_link));
4514 val_e->val = *val;
4515 val_e->loc = *loc;
4516
4517 idx = literal_value_hash (val);
4518 idx = idx & (map->bucket_count - 1);
4519 bucket_p = &map->buckets[idx];
4520
4521 val_e->next = *bucket_p;
4522 *bucket_p = val_e;
4523 map->count++;
4524 /* FIXME: Consider resizing the hash table if we get too many entries. */
4525
4526 return val_e;
4527 }
4528
4529 \f
4530 /* Lists of text actions (ta_) for narrowing, widening, longcall
4531 conversion, space fill, code & literal removal, etc. */
4532
4533 /* The following text actions are generated:
4534
4535 "ta_remove_insn" remove an instruction or instructions
4536 "ta_remove_longcall" convert longcall to call
4537 "ta_convert_longcall" convert longcall to nop/call
4538 "ta_narrow_insn" narrow a wide instruction
4539 "ta_widen" widen a narrow instruction
4540 "ta_fill" add fill or remove fill
4541 removed < 0 is a fill; branches to the fill address will be
4542 changed to address + fill size (e.g., address - removed)
4543 removed >= 0 branches to the fill address will stay unchanged
4544 "ta_remove_literal" remove a literal; this action is
4545 indicated when a literal is removed
4546 or replaced.
4547 "ta_add_literal" insert a new literal; this action is
4548 indicated when a literal has been moved.
4549 It may use a virtual_offset because
4550 multiple literals can be placed at the
4551 same location.
4552
4553 For each of these text actions, we also record the number of bytes
4554 removed by performing the text action. In the case of a "ta_widen"
4555 or a "ta_fill" that adds space, the removed_bytes will be negative. */
4556
4557 typedef struct text_action_struct text_action;
4558 typedef struct text_action_list_struct text_action_list;
4559 typedef enum text_action_enum_t text_action_t;
4560
4561 enum text_action_enum_t
4562 {
4563 ta_none,
4564 ta_remove_insn, /* removed = -size */
4565 ta_remove_longcall, /* removed = -size */
4566 ta_convert_longcall, /* removed = 0 */
4567 ta_narrow_insn, /* removed = -1 */
4568 ta_widen_insn, /* removed = +1 */
4569 ta_fill, /* removed = +size */
4570 ta_remove_literal,
4571 ta_add_literal
4572 };
4573
4574
4575 /* Structure for a text action record. */
4576 struct text_action_struct
4577 {
4578 text_action_t action;
4579 asection *sec; /* Optional */
4580 bfd_vma offset;
4581 bfd_vma virtual_offset; /* Zero except for adding literals. */
4582 int removed_bytes;
4583 literal_value value; /* Only valid when adding literals. */
4584
4585 text_action *next;
4586 };
4587
4588
4589 /* List of all of the actions taken on a text section. */
4590 struct text_action_list_struct
4591 {
4592 text_action *head;
4593 };
4594
4595
4596 static text_action *
4597 find_fill_action (text_action_list *l, asection *sec, bfd_vma offset)
4598 {
4599 text_action **m_p;
4600
4601 /* It is not necessary to fill at the end of a section. */
4602 if (sec->size == offset)
4603 return NULL;
4604
4605 for (m_p = &l->head; *m_p && (*m_p)->offset <= offset; m_p = &(*m_p)->next)
4606 {
4607 text_action *t = *m_p;
4608 /* When the action is another fill at the same address,
4609 just increase the size. */
4610 if (t->offset == offset && t->action == ta_fill)
4611 return t;
4612 }
4613 return NULL;
4614 }
4615
4616
4617 static int
4618 compute_removed_action_diff (const text_action *ta,
4619 asection *sec,
4620 bfd_vma offset,
4621 int removed,
4622 int removable_space)
4623 {
4624 int new_removed;
4625 int current_removed = 0;
4626
4627 if (ta)
4628 current_removed = ta->removed_bytes;
4629
4630 BFD_ASSERT (ta == NULL || ta->offset == offset);
4631 BFD_ASSERT (ta == NULL || ta->action == ta_fill);
4632
4633 /* It is not necessary to fill at the end of a section. Clean this up. */
4634 if (sec->size == offset)
4635 new_removed = removable_space - 0;
4636 else
4637 {
4638 int space;
4639 int added = -removed - current_removed;
4640 /* Ignore multiples of the section alignment. */
4641 added = ((1 << sec->alignment_power) - 1) & added;
4642 new_removed = (-added);
4643
4644 /* Modify for removable. */
4645 space = removable_space - new_removed;
4646 new_removed = (removable_space
4647 - (((1 << sec->alignment_power) - 1) & space));
4648 }
4649 return (new_removed - current_removed);
4650 }
4651
4652
4653 static void
4654 adjust_fill_action (text_action *ta, int fill_diff)
4655 {
4656 ta->removed_bytes += fill_diff;
4657 }
4658
4659
4660 /* Add a modification action to the text. For the case of adding or
4661 removing space, modify any current fill and assume that
4662 "unreachable_space" bytes can be freely contracted. Note that a
4663 negative removed value is a fill. */
4664
4665 static void
4666 text_action_add (text_action_list *l,
4667 text_action_t action,
4668 asection *sec,
4669 bfd_vma offset,
4670 int removed)
4671 {
4672 text_action **m_p;
4673 text_action *ta;
4674
4675 /* It is not necessary to fill at the end of a section. */
4676 if (action == ta_fill && sec->size == offset)
4677 return;
4678
4679 /* It is not necessary to fill 0 bytes. */
4680 if (action == ta_fill && removed == 0)
4681 return;
4682
4683 for (m_p = &l->head; *m_p && (*m_p)->offset <= offset; m_p = &(*m_p)->next)
4684 {
4685 text_action *t = *m_p;
4686 /* When the action is another fill at the same address,
4687 just increase the size. */
4688 if (t->offset == offset && t->action == ta_fill && action == ta_fill)
4689 {
4690 t->removed_bytes += removed;
4691 return;
4692 }
4693 }
4694
4695 /* Create a new record and fill it up. */
4696 ta = (text_action *) bfd_zmalloc (sizeof (text_action));
4697 ta->action = action;
4698 ta->sec = sec;
4699 ta->offset = offset;
4700 ta->removed_bytes = removed;
4701 ta->next = (*m_p);
4702 *m_p = ta;
4703 }
4704
4705
4706 static void
4707 text_action_add_literal (text_action_list *l,
4708 text_action_t action,
4709 const r_reloc *loc,
4710 const literal_value *value,
4711 int removed)
4712 {
4713 text_action **m_p;
4714 text_action *ta;
4715 asection *sec = r_reloc_get_section (loc);
4716 bfd_vma offset = loc->target_offset;
4717 bfd_vma virtual_offset = loc->virtual_offset;
4718
4719 BFD_ASSERT (action == ta_add_literal);
4720
4721 for (m_p = &l->head; *m_p != NULL; m_p = &(*m_p)->next)
4722 {
4723 if ((*m_p)->offset > offset
4724 && ((*m_p)->offset != offset
4725 || (*m_p)->virtual_offset > virtual_offset))
4726 break;
4727 }
4728
4729 /* Create a new record and fill it up. */
4730 ta = (text_action *) bfd_zmalloc (sizeof (text_action));
4731 ta->action = action;
4732 ta->sec = sec;
4733 ta->offset = offset;
4734 ta->virtual_offset = virtual_offset;
4735 ta->value = *value;
4736 ta->removed_bytes = removed;
4737 ta->next = (*m_p);
4738 *m_p = ta;
4739 }
4740
4741
4742 static bfd_vma
4743 offset_with_removed_text (text_action_list *action_list, bfd_vma offset)
4744 {
4745 text_action *r;
4746 int removed = 0;
4747
4748 for (r = action_list->head; r && r->offset <= offset; r = r->next)
4749 {
4750 if (r->offset < offset
4751 || (r->action == ta_fill && r->removed_bytes < 0))
4752 removed += r->removed_bytes;
4753 }
4754
4755 return (offset - removed);
4756 }
4757
4758
4759 static bfd_vma
4760 offset_with_removed_text_before_fill (text_action_list *action_list,
4761 bfd_vma offset)
4762 {
4763 text_action *r;
4764 int removed = 0;
4765
4766 for (r = action_list->head; r && r->offset < offset; r = r->next)
4767 removed += r->removed_bytes;
4768
4769 return (offset - removed);
4770 }
4771
4772
4773 /* The find_insn_action routine will only find non-fill actions. */
4774
4775 static text_action *
4776 find_insn_action (text_action_list *action_list, bfd_vma offset)
4777 {
4778 text_action *t;
4779 for (t = action_list->head; t; t = t->next)
4780 {
4781 if (t->offset == offset)
4782 {
4783 switch (t->action)
4784 {
4785 case ta_none:
4786 case ta_fill:
4787 break;
4788 case ta_remove_insn:
4789 case ta_remove_longcall:
4790 case ta_convert_longcall:
4791 case ta_narrow_insn:
4792 case ta_widen_insn:
4793 return t;
4794 case ta_remove_literal:
4795 case ta_add_literal:
4796 BFD_ASSERT (0);
4797 break;
4798 }
4799 }
4800 }
4801 return NULL;
4802 }
4803
4804
4805 #if DEBUG
4806
4807 static void
4808 print_action_list (FILE *fp, text_action_list *action_list)
4809 {
4810 text_action *r;
4811
4812 fprintf (fp, "Text Action\n");
4813 for (r = action_list->head; r != NULL; r = r->next)
4814 {
4815 const char *t = "unknown";
4816 switch (r->action)
4817 {
4818 case ta_remove_insn:
4819 t = "remove_insn"; break;
4820 case ta_remove_longcall:
4821 t = "remove_longcall"; break;
4822 case ta_convert_longcall:
4823 t = "remove_longcall"; break;
4824 case ta_narrow_insn:
4825 t = "narrow_insn"; break;
4826 case ta_widen_insn:
4827 t = "widen_insn"; break;
4828 case ta_fill:
4829 t = "fill"; break;
4830 case ta_none:
4831 t = "none"; break;
4832 case ta_remove_literal:
4833 t = "remove_literal"; break;
4834 case ta_add_literal:
4835 t = "add_literal"; break;
4836 }
4837
4838 fprintf (fp, "%s: %s[0x%lx] \"%s\" %d\n",
4839 r->sec->owner->filename,
4840 r->sec->name, r->offset, t, r->removed_bytes);
4841 }
4842 }
4843
4844 #endif /* DEBUG */
4845
4846 \f
4847 /* Lists of literals being coalesced or removed. */
4848
4849 /* In the usual case, the literal identified by "from" is being
4850 coalesced with another literal identified by "to". If the literal is
4851 unused and is being removed altogether, "to.abfd" will be NULL.
4852 The removed_literal entries are kept on a per-section list, sorted
4853 by the "from" offset field. */
4854
4855 typedef struct removed_literal_struct removed_literal;
4856 typedef struct removed_literal_list_struct removed_literal_list;
4857
4858 struct removed_literal_struct
4859 {
4860 r_reloc from;
4861 r_reloc to;
4862 removed_literal *next;
4863 };
4864
4865 struct removed_literal_list_struct
4866 {
4867 removed_literal *head;
4868 removed_literal *tail;
4869 };
4870
4871
4872 /* Record that the literal at "from" is being removed. If "to" is not
4873 NULL, the "from" literal is being coalesced with the "to" literal. */
4874
4875 static void
4876 add_removed_literal (removed_literal_list *removed_list,
4877 const r_reloc *from,
4878 const r_reloc *to)
4879 {
4880 removed_literal *r, *new_r, *next_r;
4881
4882 new_r = (removed_literal *) bfd_zmalloc (sizeof (removed_literal));
4883
4884 new_r->from = *from;
4885 if (to)
4886 new_r->to = *to;
4887 else
4888 new_r->to.abfd = NULL;
4889 new_r->next = NULL;
4890
4891 r = removed_list->head;
4892 if (r == NULL)
4893 {
4894 removed_list->head = new_r;
4895 removed_list->tail = new_r;
4896 }
4897 /* Special check for common case of append. */
4898 else if (removed_list->tail->from.target_offset < from->target_offset)
4899 {
4900 removed_list->tail->next = new_r;
4901 removed_list->tail = new_r;
4902 }
4903 else
4904 {
4905 while (r->from.target_offset < from->target_offset && r->next)
4906 {
4907 r = r->next;
4908 }
4909 next_r = r->next;
4910 r->next = new_r;
4911 new_r->next = next_r;
4912 if (next_r == NULL)
4913 removed_list->tail = new_r;
4914 }
4915 }
4916
4917
4918 /* Check if the list of removed literals contains an entry for the
4919 given address. Return the entry if found. */
4920
4921 static removed_literal *
4922 find_removed_literal (removed_literal_list *removed_list, bfd_vma addr)
4923 {
4924 removed_literal *r = removed_list->head;
4925 while (r && r->from.target_offset < addr)
4926 r = r->next;
4927 if (r && r->from.target_offset == addr)
4928 return r;
4929 return NULL;
4930 }
4931
4932
4933 #if DEBUG
4934
4935 static void
4936 print_removed_literals (FILE *fp, removed_literal_list *removed_list)
4937 {
4938 removed_literal *r;
4939 r = removed_list->head;
4940 if (r)
4941 fprintf (fp, "Removed Literals\n");
4942 for (; r != NULL; r = r->next)
4943 {
4944 print_r_reloc (fp, &r->from);
4945 fprintf (fp, " => ");
4946 if (r->to.abfd == NULL)
4947 fprintf (fp, "REMOVED");
4948 else
4949 print_r_reloc (fp, &r->to);
4950 fprintf (fp, "\n");
4951 }
4952 }
4953
4954 #endif /* DEBUG */
4955
4956 \f
4957 /* Per-section data for relaxation. */
4958
4959 typedef struct reloc_bfd_fix_struct reloc_bfd_fix;
4960
4961 struct xtensa_relax_info_struct
4962 {
4963 bfd_boolean is_relaxable_literal_section;
4964 bfd_boolean is_relaxable_asm_section;
4965 int visited; /* Number of times visited. */
4966
4967 source_reloc *src_relocs; /* Array[src_count]. */
4968 int src_count;
4969 int src_next; /* Next src_relocs entry to assign. */
4970
4971 removed_literal_list removed_list;
4972 text_action_list action_list;
4973
4974 reloc_bfd_fix *fix_list;
4975 reloc_bfd_fix *fix_array;
4976 unsigned fix_array_count;
4977
4978 /* Support for expanding the reloc array that is stored
4979 in the section structure. If the relocations have been
4980 reallocated, the newly allocated relocations will be referenced
4981 here along with the actual size allocated. The relocation
4982 count will always be found in the section structure. */
4983 Elf_Internal_Rela *allocated_relocs;
4984 unsigned relocs_count;
4985 unsigned allocated_relocs_count;
4986 };
4987
4988 struct elf_xtensa_section_data
4989 {
4990 struct bfd_elf_section_data elf;
4991 xtensa_relax_info relax_info;
4992 };
4993
4994
4995 static bfd_boolean
4996 elf_xtensa_new_section_hook (bfd *abfd, asection *sec)
4997 {
4998 struct elf_xtensa_section_data *sdata;
4999 bfd_size_type amt = sizeof (*sdata);
5000
5001 sdata = (struct elf_xtensa_section_data *) bfd_zalloc (abfd, amt);
5002 if (sdata == NULL)
5003 return FALSE;
5004 sec->used_by_bfd = (void *) sdata;
5005
5006 return _bfd_elf_new_section_hook (abfd, sec);
5007 }
5008
5009
5010 static xtensa_relax_info *
5011 get_xtensa_relax_info (asection *sec)
5012 {
5013 struct elf_xtensa_section_data *section_data;
5014
5015 /* No info available if no section or if it is an output section. */
5016 if (!sec || sec == sec->output_section)
5017 return NULL;
5018
5019 section_data = (struct elf_xtensa_section_data *) elf_section_data (sec);
5020 return &section_data->relax_info;
5021 }
5022
5023
5024 static void
5025 init_xtensa_relax_info (asection *sec)
5026 {
5027 xtensa_relax_info *relax_info = get_xtensa_relax_info (sec);
5028
5029 relax_info->is_relaxable_literal_section = FALSE;
5030 relax_info->is_relaxable_asm_section = FALSE;
5031 relax_info->visited = 0;
5032
5033 relax_info->src_relocs = NULL;
5034 relax_info->src_count = 0;
5035 relax_info->src_next = 0;
5036
5037 relax_info->removed_list.head = NULL;
5038 relax_info->removed_list.tail = NULL;
5039
5040 relax_info->action_list.head = NULL;
5041
5042 relax_info->fix_list = NULL;
5043 relax_info->fix_array = NULL;
5044 relax_info->fix_array_count = 0;
5045
5046 relax_info->allocated_relocs = NULL;
5047 relax_info->relocs_count = 0;
5048 relax_info->allocated_relocs_count = 0;
5049 }
5050
5051 \f
5052 /* Coalescing literals may require a relocation to refer to a section in
5053 a different input file, but the standard relocation information
5054 cannot express that. Instead, the reloc_bfd_fix structures are used
5055 to "fix" the relocations that refer to sections in other input files.
5056 These structures are kept on per-section lists. The "src_type" field
5057 records the relocation type in case there are multiple relocations on
5058 the same location. FIXME: This is ugly; an alternative might be to
5059 add new symbols with the "owner" field to some other input file. */
5060
5061 struct reloc_bfd_fix_struct
5062 {
5063 asection *src_sec;
5064 bfd_vma src_offset;
5065 unsigned src_type; /* Relocation type. */
5066
5067 bfd *target_abfd;
5068 asection *target_sec;
5069 bfd_vma target_offset;
5070 bfd_boolean translated;
5071
5072 reloc_bfd_fix *next;
5073 };
5074
5075
5076 static reloc_bfd_fix *
5077 reloc_bfd_fix_init (asection *src_sec,
5078 bfd_vma src_offset,
5079 unsigned src_type,
5080 bfd *target_abfd,
5081 asection *target_sec,
5082 bfd_vma target_offset,
5083 bfd_boolean translated)
5084 {
5085 reloc_bfd_fix *fix;
5086
5087 fix = (reloc_bfd_fix *) bfd_malloc (sizeof (reloc_bfd_fix));
5088 fix->src_sec = src_sec;
5089 fix->src_offset = src_offset;
5090 fix->src_type = src_type;
5091 fix->target_abfd = target_abfd;
5092 fix->target_sec = target_sec;
5093 fix->target_offset = target_offset;
5094 fix->translated = translated;
5095
5096 return fix;
5097 }
5098
5099
5100 static void
5101 add_fix (asection *src_sec, reloc_bfd_fix *fix)
5102 {
5103 xtensa_relax_info *relax_info;
5104
5105 relax_info = get_xtensa_relax_info (src_sec);
5106 fix->next = relax_info->fix_list;
5107 relax_info->fix_list = fix;
5108 }
5109
5110
5111 static int
5112 fix_compare (const void *ap, const void *bp)
5113 {
5114 const reloc_bfd_fix *a = (const reloc_bfd_fix *) ap;
5115 const reloc_bfd_fix *b = (const reloc_bfd_fix *) bp;
5116
5117 if (a->src_offset != b->src_offset)
5118 return (a->src_offset - b->src_offset);
5119 return (a->src_type - b->src_type);
5120 }
5121
5122
5123 static void
5124 cache_fix_array (asection *sec)
5125 {
5126 unsigned i, count = 0;
5127 reloc_bfd_fix *r;
5128 xtensa_relax_info *relax_info = get_xtensa_relax_info (sec);
5129
5130 if (relax_info == NULL)
5131 return;
5132 if (relax_info->fix_list == NULL)
5133 return;
5134
5135 for (r = relax_info->fix_list; r != NULL; r = r->next)
5136 count++;
5137
5138 relax_info->fix_array =
5139 (reloc_bfd_fix *) bfd_malloc (sizeof (reloc_bfd_fix) * count);
5140 relax_info->fix_array_count = count;
5141
5142 r = relax_info->fix_list;
5143 for (i = 0; i < count; i++, r = r->next)
5144 {
5145 relax_info->fix_array[count - 1 - i] = *r;
5146 relax_info->fix_array[count - 1 - i].next = NULL;
5147 }
5148
5149 qsort (relax_info->fix_array, relax_info->fix_array_count,
5150 sizeof (reloc_bfd_fix), fix_compare);
5151 }
5152
5153
5154 static reloc_bfd_fix *
5155 get_bfd_fix (asection *sec, bfd_vma offset, unsigned type)
5156 {
5157 xtensa_relax_info *relax_info = get_xtensa_relax_info (sec);
5158 reloc_bfd_fix *rv;
5159 reloc_bfd_fix key;
5160
5161 if (relax_info == NULL)
5162 return NULL;
5163 if (relax_info->fix_list == NULL)
5164 return NULL;
5165
5166 if (relax_info->fix_array == NULL)
5167 cache_fix_array (sec);
5168
5169 key.src_offset = offset;
5170 key.src_type = type;
5171 rv = bsearch (&key, relax_info->fix_array, relax_info->fix_array_count,
5172 sizeof (reloc_bfd_fix), fix_compare);
5173 return rv;
5174 }
5175
5176 \f
5177 /* Section caching. */
5178
5179 typedef struct section_cache_struct section_cache_t;
5180
5181 struct section_cache_struct
5182 {
5183 asection *sec;
5184
5185 bfd_byte *contents; /* Cache of the section contents. */
5186 bfd_size_type content_length;
5187
5188 property_table_entry *ptbl; /* Cache of the section property table. */
5189 unsigned pte_count;
5190
5191 Elf_Internal_Rela *relocs; /* Cache of the section relocations. */
5192 unsigned reloc_count;
5193 };
5194
5195
5196 static void
5197 init_section_cache (section_cache_t *sec_cache)
5198 {
5199 memset (sec_cache, 0, sizeof (*sec_cache));
5200 }
5201
5202
5203 static void
5204 clear_section_cache (section_cache_t *sec_cache)
5205 {
5206 if (sec_cache->sec)
5207 {
5208 release_contents (sec_cache->sec, sec_cache->contents);
5209 release_internal_relocs (sec_cache->sec, sec_cache->relocs);
5210 if (sec_cache->ptbl)
5211 free (sec_cache->ptbl);
5212 memset (sec_cache, 0, sizeof (sec_cache));
5213 }
5214 }
5215
5216
5217 static bfd_boolean
5218 section_cache_section (section_cache_t *sec_cache,
5219 asection *sec,
5220 struct bfd_link_info *link_info)
5221 {
5222 bfd *abfd;
5223 property_table_entry *prop_table = NULL;
5224 int ptblsize = 0;
5225 bfd_byte *contents = NULL;
5226 Elf_Internal_Rela *internal_relocs = NULL;
5227 bfd_size_type sec_size;
5228
5229 if (sec == NULL)
5230 return FALSE;
5231 if (sec == sec_cache->sec)
5232 return TRUE;
5233
5234 abfd = sec->owner;
5235 sec_size = bfd_get_section_limit (abfd, sec);
5236
5237 /* Get the contents. */
5238 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
5239 if (contents == NULL && sec_size != 0)
5240 goto err;
5241
5242 /* Get the relocations. */
5243 internal_relocs = retrieve_internal_relocs (abfd, sec,
5244 link_info->keep_memory);
5245
5246 /* Get the entry table. */
5247 ptblsize = xtensa_read_table_entries (abfd, sec, &prop_table,
5248 XTENSA_PROP_SEC_NAME, FALSE);
5249 if (ptblsize < 0)
5250 goto err;
5251
5252 /* Fill in the new section cache. */
5253 clear_section_cache (sec_cache);
5254 memset (sec_cache, 0, sizeof (sec_cache));
5255
5256 sec_cache->sec = sec;
5257 sec_cache->contents = contents;
5258 sec_cache->content_length = sec_size;
5259 sec_cache->relocs = internal_relocs;
5260 sec_cache->reloc_count = sec->reloc_count;
5261 sec_cache->pte_count = ptblsize;
5262 sec_cache->ptbl = prop_table;
5263
5264 return TRUE;
5265
5266 err:
5267 release_contents (sec, contents);
5268 release_internal_relocs (sec, internal_relocs);
5269 if (prop_table)
5270 free (prop_table);
5271 return FALSE;
5272 }
5273
5274 \f
5275 /* Extended basic blocks. */
5276
5277 /* An ebb_struct represents an Extended Basic Block. Within this
5278 range, we guarantee that all instructions are decodable, the
5279 property table entries are contiguous, and no property table
5280 specifies a segment that cannot have instructions moved. This
5281 structure contains caches of the contents, property table and
5282 relocations for the specified section for easy use. The range is
5283 specified by ranges of indices for the byte offset, property table
5284 offsets and relocation offsets. These must be consistent. */
5285
5286 typedef struct ebb_struct ebb_t;
5287
5288 struct ebb_struct
5289 {
5290 asection *sec;
5291
5292 bfd_byte *contents; /* Cache of the section contents. */
5293 bfd_size_type content_length;
5294
5295 property_table_entry *ptbl; /* Cache of the section property table. */
5296 unsigned pte_count;
5297
5298 Elf_Internal_Rela *relocs; /* Cache of the section relocations. */
5299 unsigned reloc_count;
5300
5301 bfd_vma start_offset; /* Offset in section. */
5302 unsigned start_ptbl_idx; /* Offset in the property table. */
5303 unsigned start_reloc_idx; /* Offset in the relocations. */
5304
5305 bfd_vma end_offset;
5306 unsigned end_ptbl_idx;
5307 unsigned end_reloc_idx;
5308
5309 bfd_boolean ends_section; /* Is this the last ebb in a section? */
5310
5311 /* The unreachable property table at the end of this set of blocks;
5312 NULL if the end is not an unreachable block. */
5313 property_table_entry *ends_unreachable;
5314 };
5315
5316
5317 enum ebb_target_enum
5318 {
5319 EBB_NO_ALIGN = 0,
5320 EBB_DESIRE_TGT_ALIGN,
5321 EBB_REQUIRE_TGT_ALIGN,
5322 EBB_REQUIRE_LOOP_ALIGN,
5323 EBB_REQUIRE_ALIGN
5324 };
5325
5326
5327 /* proposed_action_struct is similar to the text_action_struct except
5328 that is represents a potential transformation, not one that will
5329 occur. We build a list of these for an extended basic block
5330 and use them to compute the actual actions desired. We must be
5331 careful that the entire set of actual actions we perform do not
5332 break any relocations that would fit if the actions were not
5333 performed. */
5334
5335 typedef struct proposed_action_struct proposed_action;
5336
5337 struct proposed_action_struct
5338 {
5339 enum ebb_target_enum align_type; /* for the target alignment */
5340 bfd_vma alignment_pow;
5341 text_action_t action;
5342 bfd_vma offset;
5343 int removed_bytes;
5344 bfd_boolean do_action; /* If false, then we will not perform the action. */
5345 };
5346
5347
5348 /* The ebb_constraint_struct keeps a set of proposed actions for an
5349 extended basic block. */
5350
5351 typedef struct ebb_constraint_struct ebb_constraint;
5352
5353 struct ebb_constraint_struct
5354 {
5355 ebb_t ebb;
5356 bfd_boolean start_movable;
5357
5358 /* Bytes of extra space at the beginning if movable. */
5359 int start_extra_space;
5360
5361 enum ebb_target_enum start_align;
5362
5363 bfd_boolean end_movable;
5364
5365 /* Bytes of extra space at the end if movable. */
5366 int end_extra_space;
5367
5368 unsigned action_count;
5369 unsigned action_allocated;
5370
5371 /* Array of proposed actions. */
5372 proposed_action *actions;
5373
5374 /* Action alignments -- one for each proposed action. */
5375 enum ebb_target_enum *action_aligns;
5376 };
5377
5378
5379 static void
5380 init_ebb_constraint (ebb_constraint *c)
5381 {
5382 memset (c, 0, sizeof (ebb_constraint));
5383 }
5384
5385
5386 static void
5387 free_ebb_constraint (ebb_constraint *c)
5388 {
5389 if (c->actions)
5390 free (c->actions);
5391 }
5392
5393
5394 static void
5395 init_ebb (ebb_t *ebb,
5396 asection *sec,
5397 bfd_byte *contents,
5398 bfd_size_type content_length,
5399 property_table_entry *prop_table,
5400 unsigned ptblsize,
5401 Elf_Internal_Rela *internal_relocs,
5402 unsigned reloc_count)
5403 {
5404 memset (ebb, 0, sizeof (ebb_t));
5405 ebb->sec = sec;
5406 ebb->contents = contents;
5407 ebb->content_length = content_length;
5408 ebb->ptbl = prop_table;
5409 ebb->pte_count = ptblsize;
5410 ebb->relocs = internal_relocs;
5411 ebb->reloc_count = reloc_count;
5412 ebb->start_offset = 0;
5413 ebb->end_offset = ebb->content_length - 1;
5414 ebb->start_ptbl_idx = 0;
5415 ebb->end_ptbl_idx = ptblsize;
5416 ebb->start_reloc_idx = 0;
5417 ebb->end_reloc_idx = reloc_count;
5418 }
5419
5420
5421 /* Extend the ebb to all decodable contiguous sections. The algorithm
5422 for building a basic block around an instruction is to push it
5423 forward until we hit the end of a section, an unreachable block or
5424 a block that cannot be transformed. Then we push it backwards
5425 searching for similar conditions. */
5426
5427 static bfd_boolean extend_ebb_bounds_forward (ebb_t *);
5428 static bfd_boolean extend_ebb_bounds_backward (ebb_t *);
5429 static bfd_size_type insn_block_decodable_len
5430 (bfd_byte *, bfd_size_type, bfd_vma, bfd_size_type);
5431
5432 static bfd_boolean
5433 extend_ebb_bounds (ebb_t *ebb)
5434 {
5435 if (!extend_ebb_bounds_forward (ebb))
5436 return FALSE;
5437 if (!extend_ebb_bounds_backward (ebb))
5438 return FALSE;
5439 return TRUE;
5440 }
5441
5442
5443 static bfd_boolean
5444 extend_ebb_bounds_forward (ebb_t *ebb)
5445 {
5446 property_table_entry *the_entry, *new_entry;
5447
5448 the_entry = &ebb->ptbl[ebb->end_ptbl_idx];
5449
5450 /* Stop when (1) we cannot decode an instruction, (2) we are at
5451 the end of the property tables, (3) we hit a non-contiguous property
5452 table entry, (4) we hit a NO_TRANSFORM region. */
5453
5454 while (1)
5455 {
5456 bfd_vma entry_end;
5457 bfd_size_type insn_block_len;
5458
5459 entry_end = the_entry->address - ebb->sec->vma + the_entry->size;
5460 insn_block_len =
5461 insn_block_decodable_len (ebb->contents, ebb->content_length,
5462 ebb->end_offset,
5463 entry_end - ebb->end_offset);
5464 if (insn_block_len != (entry_end - ebb->end_offset))
5465 {
5466 (*_bfd_error_handler)
5467 (_("%B(%A+0x%lx): could not decode instruction; possible configuration mismatch"),
5468 ebb->sec->owner, ebb->sec, ebb->end_offset + insn_block_len);
5469 return FALSE;
5470 }
5471 ebb->end_offset += insn_block_len;
5472
5473 if (ebb->end_offset == ebb->sec->size)
5474 ebb->ends_section = TRUE;
5475
5476 /* Update the reloc counter. */
5477 while (ebb->end_reloc_idx + 1 < ebb->reloc_count
5478 && (ebb->relocs[ebb->end_reloc_idx + 1].r_offset
5479 < ebb->end_offset))
5480 {
5481 ebb->end_reloc_idx++;
5482 }
5483
5484 if (ebb->end_ptbl_idx + 1 == ebb->pte_count)
5485 return TRUE;
5486
5487 new_entry = &ebb->ptbl[ebb->end_ptbl_idx + 1];
5488 if (((new_entry->flags & XTENSA_PROP_INSN) == 0)
5489 || ((new_entry->flags & XTENSA_PROP_INSN_NO_TRANSFORM) != 0)
5490 || ((the_entry->flags & XTENSA_PROP_ALIGN) != 0))
5491 break;
5492
5493 if (the_entry->address + the_entry->size != new_entry->address)
5494 break;
5495
5496 the_entry = new_entry;
5497 ebb->end_ptbl_idx++;
5498 }
5499
5500 /* Quick check for an unreachable or end of file just at the end. */
5501 if (ebb->end_ptbl_idx + 1 == ebb->pte_count)
5502 {
5503 if (ebb->end_offset == ebb->content_length)
5504 ebb->ends_section = TRUE;
5505 }
5506 else
5507 {
5508 new_entry = &ebb->ptbl[ebb->end_ptbl_idx + 1];
5509 if ((new_entry->flags & XTENSA_PROP_UNREACHABLE) != 0
5510 && the_entry->address + the_entry->size == new_entry->address)
5511 ebb->ends_unreachable = new_entry;
5512 }
5513
5514 /* Any other ending requires exact alignment. */
5515 return TRUE;
5516 }
5517
5518
5519 static bfd_boolean
5520 extend_ebb_bounds_backward (ebb_t *ebb)
5521 {
5522 property_table_entry *the_entry, *new_entry;
5523
5524 the_entry = &ebb->ptbl[ebb->start_ptbl_idx];
5525
5526 /* Stop when (1) we cannot decode the instructions in the current entry.
5527 (2) we are at the beginning of the property tables, (3) we hit a
5528 non-contiguous property table entry, (4) we hit a NO_TRANSFORM region. */
5529
5530 while (1)
5531 {
5532 bfd_vma block_begin;
5533 bfd_size_type insn_block_len;
5534
5535 block_begin = the_entry->address - ebb->sec->vma;
5536 insn_block_len =
5537 insn_block_decodable_len (ebb->contents, ebb->content_length,
5538 block_begin,
5539 ebb->start_offset - block_begin);
5540 if (insn_block_len != ebb->start_offset - block_begin)
5541 {
5542 (*_bfd_error_handler)
5543 (_("%B(%A+0x%lx): could not decode instruction; possible configuration mismatch"),
5544 ebb->sec->owner, ebb->sec, ebb->end_offset + insn_block_len);
5545 return FALSE;
5546 }
5547 ebb->start_offset -= insn_block_len;
5548
5549 /* Update the reloc counter. */
5550 while (ebb->start_reloc_idx > 0
5551 && (ebb->relocs[ebb->start_reloc_idx - 1].r_offset
5552 >= ebb->start_offset))
5553 {
5554 ebb->start_reloc_idx--;
5555 }
5556
5557 if (ebb->start_ptbl_idx == 0)
5558 return TRUE;
5559
5560 new_entry = &ebb->ptbl[ebb->start_ptbl_idx - 1];
5561 if ((new_entry->flags & XTENSA_PROP_INSN) == 0
5562 || ((new_entry->flags & XTENSA_PROP_INSN_NO_TRANSFORM) != 0)
5563 || ((new_entry->flags & XTENSA_PROP_ALIGN) != 0))
5564 return TRUE;
5565 if (new_entry->address + new_entry->size != the_entry->address)
5566 return TRUE;
5567
5568 the_entry = new_entry;
5569 ebb->start_ptbl_idx--;
5570 }
5571 return TRUE;
5572 }
5573
5574
5575 static bfd_size_type
5576 insn_block_decodable_len (bfd_byte *contents,
5577 bfd_size_type content_len,
5578 bfd_vma block_offset,
5579 bfd_size_type block_len)
5580 {
5581 bfd_vma offset = block_offset;
5582
5583 while (offset < block_offset + block_len)
5584 {
5585 bfd_size_type insn_len = 0;
5586
5587 insn_len = insn_decode_len (contents, content_len, offset);
5588 if (insn_len == 0)
5589 return (offset - block_offset);
5590 offset += insn_len;
5591 }
5592 return (offset - block_offset);
5593 }
5594
5595
5596 static void
5597 ebb_propose_action (ebb_constraint *c,
5598 enum ebb_target_enum align_type,
5599 bfd_vma alignment_pow,
5600 text_action_t action,
5601 bfd_vma offset,
5602 int removed_bytes,
5603 bfd_boolean do_action)
5604 {
5605 proposed_action *act;
5606
5607 if (c->action_allocated <= c->action_count)
5608 {
5609 unsigned new_allocated, i;
5610 proposed_action *new_actions;
5611
5612 new_allocated = (c->action_count + 2) * 2;
5613 new_actions = (proposed_action *)
5614 bfd_zmalloc (sizeof (proposed_action) * new_allocated);
5615
5616 for (i = 0; i < c->action_count; i++)
5617 new_actions[i] = c->actions[i];
5618 if (c->actions)
5619 free (c->actions);
5620 c->actions = new_actions;
5621 c->action_allocated = new_allocated;
5622 }
5623
5624 act = &c->actions[c->action_count];
5625 act->align_type = align_type;
5626 act->alignment_pow = alignment_pow;
5627 act->action = action;
5628 act->offset = offset;
5629 act->removed_bytes = removed_bytes;
5630 act->do_action = do_action;
5631
5632 c->action_count++;
5633 }
5634
5635 \f
5636 /* Access to internal relocations, section contents and symbols. */
5637
5638 /* During relaxation, we need to modify relocations, section contents,
5639 and symbol definitions, and we need to keep the original values from
5640 being reloaded from the input files, i.e., we need to "pin" the
5641 modified values in memory. We also want to continue to observe the
5642 setting of the "keep-memory" flag. The following functions wrap the
5643 standard BFD functions to take care of this for us. */
5644
5645 static Elf_Internal_Rela *
5646 retrieve_internal_relocs (bfd *abfd, asection *sec, bfd_boolean keep_memory)
5647 {
5648 Elf_Internal_Rela *internal_relocs;
5649
5650 if ((sec->flags & SEC_LINKER_CREATED) != 0)
5651 return NULL;
5652
5653 internal_relocs = elf_section_data (sec)->relocs;
5654 if (internal_relocs == NULL)
5655 internal_relocs = (_bfd_elf_link_read_relocs
5656 (abfd, sec, NULL, NULL, keep_memory));
5657 return internal_relocs;
5658 }
5659
5660
5661 static void
5662 pin_internal_relocs (asection *sec, Elf_Internal_Rela *internal_relocs)
5663 {
5664 elf_section_data (sec)->relocs = internal_relocs;
5665 }
5666
5667
5668 static void
5669 release_internal_relocs (asection *sec, Elf_Internal_Rela *internal_relocs)
5670 {
5671 if (internal_relocs
5672 && elf_section_data (sec)->relocs != internal_relocs)
5673 free (internal_relocs);
5674 }
5675
5676
5677 static bfd_byte *
5678 retrieve_contents (bfd *abfd, asection *sec, bfd_boolean keep_memory)
5679 {
5680 bfd_byte *contents;
5681 bfd_size_type sec_size;
5682
5683 sec_size = bfd_get_section_limit (abfd, sec);
5684 contents = elf_section_data (sec)->this_hdr.contents;
5685
5686 if (contents == NULL && sec_size != 0)
5687 {
5688 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
5689 {
5690 if (contents)
5691 free (contents);
5692 return NULL;
5693 }
5694 if (keep_memory)
5695 elf_section_data (sec)->this_hdr.contents = contents;
5696 }
5697 return contents;
5698 }
5699
5700
5701 static void
5702 pin_contents (asection *sec, bfd_byte *contents)
5703 {
5704 elf_section_data (sec)->this_hdr.contents = contents;
5705 }
5706
5707
5708 static void
5709 release_contents (asection *sec, bfd_byte *contents)
5710 {
5711 if (contents && elf_section_data (sec)->this_hdr.contents != contents)
5712 free (contents);
5713 }
5714
5715
5716 static Elf_Internal_Sym *
5717 retrieve_local_syms (bfd *input_bfd)
5718 {
5719 Elf_Internal_Shdr *symtab_hdr;
5720 Elf_Internal_Sym *isymbuf;
5721 size_t locsymcount;
5722
5723 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
5724 locsymcount = symtab_hdr->sh_info;
5725
5726 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
5727 if (isymbuf == NULL && locsymcount != 0)
5728 isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, locsymcount, 0,
5729 NULL, NULL, NULL);
5730
5731 /* Save the symbols for this input file so they won't be read again. */
5732 if (isymbuf && isymbuf != (Elf_Internal_Sym *) symtab_hdr->contents)
5733 symtab_hdr->contents = (unsigned char *) isymbuf;
5734
5735 return isymbuf;
5736 }
5737
5738 \f
5739 /* Code for link-time relaxation. */
5740
5741 /* Initialization for relaxation: */
5742 static bfd_boolean analyze_relocations (struct bfd_link_info *);
5743 static bfd_boolean find_relaxable_sections
5744 (bfd *, asection *, struct bfd_link_info *, bfd_boolean *);
5745 static bfd_boolean collect_source_relocs
5746 (bfd *, asection *, struct bfd_link_info *);
5747 static bfd_boolean is_resolvable_asm_expansion
5748 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, struct bfd_link_info *,
5749 bfd_boolean *);
5750 static Elf_Internal_Rela *find_associated_l32r_irel
5751 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, Elf_Internal_Rela *);
5752 static bfd_boolean compute_text_actions
5753 (bfd *, asection *, struct bfd_link_info *);
5754 static bfd_boolean compute_ebb_proposed_actions (ebb_constraint *);
5755 static bfd_boolean compute_ebb_actions (ebb_constraint *);
5756 static bfd_boolean check_section_ebb_pcrels_fit
5757 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, const ebb_constraint *);
5758 static bfd_boolean check_section_ebb_reduces (const ebb_constraint *);
5759 static void text_action_add_proposed
5760 (text_action_list *, const ebb_constraint *, asection *);
5761 static int compute_fill_extra_space (property_table_entry *);
5762
5763 /* First pass: */
5764 static bfd_boolean compute_removed_literals
5765 (bfd *, asection *, struct bfd_link_info *, value_map_hash_table *);
5766 static Elf_Internal_Rela *get_irel_at_offset
5767 (asection *, Elf_Internal_Rela *, bfd_vma);
5768 static bfd_boolean is_removable_literal
5769 (const source_reloc *, int, const source_reloc *, int);
5770 static bfd_boolean remove_dead_literal
5771 (bfd *, asection *, struct bfd_link_info *, Elf_Internal_Rela *,
5772 Elf_Internal_Rela *, source_reloc *, property_table_entry *, int);
5773 static bfd_boolean identify_literal_placement
5774 (bfd *, asection *, bfd_byte *, struct bfd_link_info *,
5775 value_map_hash_table *, bfd_boolean *, Elf_Internal_Rela *, int,
5776 source_reloc *, property_table_entry *, int, section_cache_t *,
5777 bfd_boolean);
5778 static bfd_boolean relocations_reach (source_reloc *, int, const r_reloc *);
5779 static bfd_boolean coalesce_shared_literal
5780 (asection *, source_reloc *, property_table_entry *, int, value_map *);
5781 static bfd_boolean move_shared_literal
5782 (asection *, struct bfd_link_info *, source_reloc *, property_table_entry *,
5783 int, const r_reloc *, const literal_value *, section_cache_t *);
5784
5785 /* Second pass: */
5786 static bfd_boolean relax_section (bfd *, asection *, struct bfd_link_info *);
5787 static bfd_boolean translate_section_fixes (asection *);
5788 static bfd_boolean translate_reloc_bfd_fix (reloc_bfd_fix *);
5789 static void translate_reloc (const r_reloc *, r_reloc *);
5790 static void shrink_dynamic_reloc_sections
5791 (struct bfd_link_info *, bfd *, asection *, Elf_Internal_Rela *);
5792 static bfd_boolean move_literal
5793 (bfd *, struct bfd_link_info *, asection *, bfd_vma, bfd_byte *,
5794 xtensa_relax_info *, Elf_Internal_Rela **, const literal_value *);
5795 static bfd_boolean relax_property_section
5796 (bfd *, asection *, struct bfd_link_info *);
5797
5798 /* Third pass: */
5799 static bfd_boolean relax_section_symbols (bfd *, asection *);
5800
5801
5802 static bfd_boolean
5803 elf_xtensa_relax_section (bfd *abfd,
5804 asection *sec,
5805 struct bfd_link_info *link_info,
5806 bfd_boolean *again)
5807 {
5808 static value_map_hash_table *values = NULL;
5809 static bfd_boolean relocations_analyzed = FALSE;
5810 xtensa_relax_info *relax_info;
5811
5812 if (!relocations_analyzed)
5813 {
5814 /* Do some overall initialization for relaxation. */
5815 values = value_map_hash_table_init ();
5816 if (values == NULL)
5817 return FALSE;
5818 relaxing_section = TRUE;
5819 if (!analyze_relocations (link_info))
5820 return FALSE;
5821 relocations_analyzed = TRUE;
5822 }
5823 *again = FALSE;
5824
5825 /* Don't mess with linker-created sections. */
5826 if ((sec->flags & SEC_LINKER_CREATED) != 0)
5827 return TRUE;
5828
5829 relax_info = get_xtensa_relax_info (sec);
5830 BFD_ASSERT (relax_info != NULL);
5831
5832 switch (relax_info->visited)
5833 {
5834 case 0:
5835 /* Note: It would be nice to fold this pass into
5836 analyze_relocations, but it is important for this step that the
5837 sections be examined in link order. */
5838 if (!compute_removed_literals (abfd, sec, link_info, values))
5839 return FALSE;
5840 *again = TRUE;
5841 break;
5842
5843 case 1:
5844 if (values)
5845 value_map_hash_table_delete (values);
5846 values = NULL;
5847 if (!relax_section (abfd, sec, link_info))
5848 return FALSE;
5849 *again = TRUE;
5850 break;
5851
5852 case 2:
5853 if (!relax_section_symbols (abfd, sec))
5854 return FALSE;
5855 break;
5856 }
5857
5858 relax_info->visited++;
5859 return TRUE;
5860 }
5861
5862 \f
5863 /* Initialization for relaxation. */
5864
5865 /* This function is called once at the start of relaxation. It scans
5866 all the input sections and marks the ones that are relaxable (i.e.,
5867 literal sections with L32R relocations against them), and then
5868 collects source_reloc information for all the relocations against
5869 those relaxable sections. During this process, it also detects
5870 longcalls, i.e., calls relaxed by the assembler into indirect
5871 calls, that can be optimized back into direct calls. Within each
5872 extended basic block (ebb) containing an optimized longcall, it
5873 computes a set of "text actions" that can be performed to remove
5874 the L32R associated with the longcall while optionally preserving
5875 branch target alignments. */
5876
5877 static bfd_boolean
5878 analyze_relocations (struct bfd_link_info *link_info)
5879 {
5880 bfd *abfd;
5881 asection *sec;
5882 bfd_boolean is_relaxable = FALSE;
5883
5884 /* Initialize the per-section relaxation info. */
5885 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next)
5886 for (sec = abfd->sections; sec != NULL; sec = sec->next)
5887 {
5888 init_xtensa_relax_info (sec);
5889 }
5890
5891 /* Mark relaxable sections (and count relocations against each one). */
5892 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next)
5893 for (sec = abfd->sections; sec != NULL; sec = sec->next)
5894 {
5895 if (!find_relaxable_sections (abfd, sec, link_info, &is_relaxable))
5896 return FALSE;
5897 }
5898
5899 /* Bail out if there are no relaxable sections. */
5900 if (!is_relaxable)
5901 return TRUE;
5902
5903 /* Allocate space for source_relocs. */
5904 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next)
5905 for (sec = abfd->sections; sec != NULL; sec = sec->next)
5906 {
5907 xtensa_relax_info *relax_info;
5908
5909 relax_info = get_xtensa_relax_info (sec);
5910 if (relax_info->is_relaxable_literal_section
5911 || relax_info->is_relaxable_asm_section)
5912 {
5913 relax_info->src_relocs = (source_reloc *)
5914 bfd_malloc (relax_info->src_count * sizeof (source_reloc));
5915 }
5916 }
5917
5918 /* Collect info on relocations against each relaxable section. */
5919 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next)
5920 for (sec = abfd->sections; sec != NULL; sec = sec->next)
5921 {
5922 if (!collect_source_relocs (abfd, sec, link_info))
5923 return FALSE;
5924 }
5925
5926 /* Compute the text actions. */
5927 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next)
5928 for (sec = abfd->sections; sec != NULL; sec = sec->next)
5929 {
5930 if (!compute_text_actions (abfd, sec, link_info))
5931 return FALSE;
5932 }
5933
5934 return TRUE;
5935 }
5936
5937
5938 /* Find all the sections that might be relaxed. The motivation for
5939 this pass is that collect_source_relocs() needs to record _all_ the
5940 relocations that target each relaxable section. That is expensive
5941 and unnecessary unless the target section is actually going to be
5942 relaxed. This pass identifies all such sections by checking if
5943 they have L32Rs pointing to them. In the process, the total number
5944 of relocations targeting each section is also counted so that we
5945 know how much space to allocate for source_relocs against each
5946 relaxable literal section. */
5947
5948 static bfd_boolean
5949 find_relaxable_sections (bfd *abfd,
5950 asection *sec,
5951 struct bfd_link_info *link_info,
5952 bfd_boolean *is_relaxable_p)
5953 {
5954 Elf_Internal_Rela *internal_relocs;
5955 bfd_byte *contents;
5956 bfd_boolean ok = TRUE;
5957 unsigned i;
5958 xtensa_relax_info *source_relax_info;
5959
5960 internal_relocs = retrieve_internal_relocs (abfd, sec,
5961 link_info->keep_memory);
5962 if (internal_relocs == NULL)
5963 return ok;
5964
5965 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
5966 if (contents == NULL && sec->size != 0)
5967 {
5968 ok = FALSE;
5969 goto error_return;
5970 }
5971
5972 source_relax_info = get_xtensa_relax_info (sec);
5973 for (i = 0; i < sec->reloc_count; i++)
5974 {
5975 Elf_Internal_Rela *irel = &internal_relocs[i];
5976 r_reloc r_rel;
5977 asection *target_sec;
5978 xtensa_relax_info *target_relax_info;
5979
5980 /* If this section has not already been marked as "relaxable", and
5981 if it contains any ASM_EXPAND relocations (marking expanded
5982 longcalls) that can be optimized into direct calls, then mark
5983 the section as "relaxable". */
5984 if (source_relax_info
5985 && !source_relax_info->is_relaxable_asm_section
5986 && ELF32_R_TYPE (irel->r_info) == R_XTENSA_ASM_EXPAND)
5987 {
5988 bfd_boolean is_reachable = FALSE;
5989 if (is_resolvable_asm_expansion (abfd, sec, contents, irel,
5990 link_info, &is_reachable)
5991 && is_reachable)
5992 {
5993 source_relax_info->is_relaxable_asm_section = TRUE;
5994 *is_relaxable_p = TRUE;
5995 }
5996 }
5997
5998 r_reloc_init (&r_rel, abfd, irel, contents,
5999 bfd_get_section_limit (abfd, sec));
6000
6001 target_sec = r_reloc_get_section (&r_rel);
6002 target_relax_info = get_xtensa_relax_info (target_sec);
6003 if (!target_relax_info)
6004 continue;
6005
6006 /* Count PC-relative operand relocations against the target section.
6007 Note: The conditions tested here must match the conditions under
6008 which init_source_reloc is called in collect_source_relocs(). */
6009 if (is_operand_relocation (ELF32_R_TYPE (irel->r_info))
6010 && (!is_alt_relocation (ELF32_R_TYPE (irel->r_info))
6011 || is_l32r_relocation (abfd, sec, contents, irel)))
6012 target_relax_info->src_count++;
6013
6014 if (is_l32r_relocation (abfd, sec, contents, irel)
6015 && r_reloc_is_defined (&r_rel))
6016 {
6017 /* Mark the target section as relaxable. */
6018 target_relax_info->is_relaxable_literal_section = TRUE;
6019 *is_relaxable_p = TRUE;
6020 }
6021 }
6022
6023 error_return:
6024 release_contents (sec, contents);
6025 release_internal_relocs (sec, internal_relocs);
6026 return ok;
6027 }
6028
6029
6030 /* Record _all_ the relocations that point to relaxable sections, and
6031 get rid of ASM_EXPAND relocs by either converting them to
6032 ASM_SIMPLIFY or by removing them. */
6033
6034 static bfd_boolean
6035 collect_source_relocs (bfd *abfd,
6036 asection *sec,
6037 struct bfd_link_info *link_info)
6038 {
6039 Elf_Internal_Rela *internal_relocs;
6040 bfd_byte *contents;
6041 bfd_boolean ok = TRUE;
6042 unsigned i;
6043 bfd_size_type sec_size;
6044
6045 internal_relocs = retrieve_internal_relocs (abfd, sec,
6046 link_info->keep_memory);
6047 if (internal_relocs == NULL)
6048 return ok;
6049
6050 sec_size = bfd_get_section_limit (abfd, sec);
6051 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
6052 if (contents == NULL && sec_size != 0)
6053 {
6054 ok = FALSE;
6055 goto error_return;
6056 }
6057
6058 /* Record relocations against relaxable literal sections. */
6059 for (i = 0; i < sec->reloc_count; i++)
6060 {
6061 Elf_Internal_Rela *irel = &internal_relocs[i];
6062 r_reloc r_rel;
6063 asection *target_sec;
6064 xtensa_relax_info *target_relax_info;
6065
6066 r_reloc_init (&r_rel, abfd, irel, contents, sec_size);
6067
6068 target_sec = r_reloc_get_section (&r_rel);
6069 target_relax_info = get_xtensa_relax_info (target_sec);
6070
6071 if (target_relax_info
6072 && (target_relax_info->is_relaxable_literal_section
6073 || target_relax_info->is_relaxable_asm_section))
6074 {
6075 xtensa_opcode opcode = XTENSA_UNDEFINED;
6076 int opnd = -1;
6077 bfd_boolean is_abs_literal = FALSE;
6078
6079 if (is_alt_relocation (ELF32_R_TYPE (irel->r_info)))
6080 {
6081 /* None of the current alternate relocs are PC-relative,
6082 and only PC-relative relocs matter here. However, we
6083 still need to record the opcode for literal
6084 coalescing. */
6085 opcode = get_relocation_opcode (abfd, sec, contents, irel);
6086 if (opcode == get_l32r_opcode ())
6087 {
6088 is_abs_literal = TRUE;
6089 opnd = 1;
6090 }
6091 else
6092 opcode = XTENSA_UNDEFINED;
6093 }
6094 else if (is_operand_relocation (ELF32_R_TYPE (irel->r_info)))
6095 {
6096 opcode = get_relocation_opcode (abfd, sec, contents, irel);
6097 opnd = get_relocation_opnd (opcode, ELF32_R_TYPE (irel->r_info));
6098 }
6099
6100 if (opcode != XTENSA_UNDEFINED)
6101 {
6102 int src_next = target_relax_info->src_next++;
6103 source_reloc *s_reloc = &target_relax_info->src_relocs[src_next];
6104
6105 init_source_reloc (s_reloc, sec, &r_rel, opcode, opnd,
6106 is_abs_literal);
6107 }
6108 }
6109 }
6110
6111 /* Now get rid of ASM_EXPAND relocations. At this point, the
6112 src_relocs array for the target literal section may still be
6113 incomplete, but it must at least contain the entries for the L32R
6114 relocations associated with ASM_EXPANDs because they were just
6115 added in the preceding loop over the relocations. */
6116
6117 for (i = 0; i < sec->reloc_count; i++)
6118 {
6119 Elf_Internal_Rela *irel = &internal_relocs[i];
6120 bfd_boolean is_reachable;
6121
6122 if (!is_resolvable_asm_expansion (abfd, sec, contents, irel, link_info,
6123 &is_reachable))
6124 continue;
6125
6126 if (is_reachable)
6127 {
6128 Elf_Internal_Rela *l32r_irel;
6129 r_reloc r_rel;
6130 asection *target_sec;
6131 xtensa_relax_info *target_relax_info;
6132
6133 /* Mark the source_reloc for the L32R so that it will be
6134 removed in compute_removed_literals(), along with the
6135 associated literal. */
6136 l32r_irel = find_associated_l32r_irel (abfd, sec, contents,
6137 irel, internal_relocs);
6138 if (l32r_irel == NULL)
6139 continue;
6140
6141 r_reloc_init (&r_rel, abfd, l32r_irel, contents, sec_size);
6142
6143 target_sec = r_reloc_get_section (&r_rel);
6144 target_relax_info = get_xtensa_relax_info (target_sec);
6145
6146 if (target_relax_info
6147 && (target_relax_info->is_relaxable_literal_section
6148 || target_relax_info->is_relaxable_asm_section))
6149 {
6150 source_reloc *s_reloc;
6151
6152 /* Search the source_relocs for the entry corresponding to
6153 the l32r_irel. Note: The src_relocs array is not yet
6154 sorted, but it wouldn't matter anyway because we're
6155 searching by source offset instead of target offset. */
6156 s_reloc = find_source_reloc (target_relax_info->src_relocs,
6157 target_relax_info->src_next,
6158 sec, l32r_irel);
6159 BFD_ASSERT (s_reloc);
6160 s_reloc->is_null = TRUE;
6161 }
6162
6163 /* Convert this reloc to ASM_SIMPLIFY. */
6164 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
6165 R_XTENSA_ASM_SIMPLIFY);
6166 l32r_irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
6167
6168 pin_internal_relocs (sec, internal_relocs);
6169 }
6170 else
6171 {
6172 /* It is resolvable but doesn't reach. We resolve now
6173 by eliminating the relocation -- the call will remain
6174 expanded into L32R/CALLX. */
6175 irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
6176 pin_internal_relocs (sec, internal_relocs);
6177 }
6178 }
6179
6180 error_return:
6181 release_contents (sec, contents);
6182 release_internal_relocs (sec, internal_relocs);
6183 return ok;
6184 }
6185
6186
6187 /* Return TRUE if the asm expansion can be resolved. Generally it can
6188 be resolved on a final link or when a partial link locates it in the
6189 same section as the target. Set "is_reachable" flag if the target of
6190 the call is within the range of a direct call, given the current VMA
6191 for this section and the target section. */
6192
6193 bfd_boolean
6194 is_resolvable_asm_expansion (bfd *abfd,
6195 asection *sec,
6196 bfd_byte *contents,
6197 Elf_Internal_Rela *irel,
6198 struct bfd_link_info *link_info,
6199 bfd_boolean *is_reachable_p)
6200 {
6201 asection *target_sec;
6202 bfd_vma target_offset;
6203 r_reloc r_rel;
6204 xtensa_opcode opcode, direct_call_opcode;
6205 bfd_vma self_address;
6206 bfd_vma dest_address;
6207 bfd_boolean uses_l32r;
6208 bfd_size_type sec_size;
6209
6210 *is_reachable_p = FALSE;
6211
6212 if (contents == NULL)
6213 return FALSE;
6214
6215 if (ELF32_R_TYPE (irel->r_info) != R_XTENSA_ASM_EXPAND)
6216 return FALSE;
6217
6218 sec_size = bfd_get_section_limit (abfd, sec);
6219 opcode = get_expanded_call_opcode (contents + irel->r_offset,
6220 sec_size - irel->r_offset, &uses_l32r);
6221 /* Optimization of longcalls that use CONST16 is not yet implemented. */
6222 if (!uses_l32r)
6223 return FALSE;
6224
6225 direct_call_opcode = swap_callx_for_call_opcode (opcode);
6226 if (direct_call_opcode == XTENSA_UNDEFINED)
6227 return FALSE;
6228
6229 /* Check and see that the target resolves. */
6230 r_reloc_init (&r_rel, abfd, irel, contents, sec_size);
6231 if (!r_reloc_is_defined (&r_rel))
6232 return FALSE;
6233
6234 target_sec = r_reloc_get_section (&r_rel);
6235 target_offset = r_rel.target_offset;
6236
6237 /* If the target is in a shared library, then it doesn't reach. This
6238 isn't supposed to come up because the compiler should never generate
6239 non-PIC calls on systems that use shared libraries, but the linker
6240 shouldn't crash regardless. */
6241 if (!target_sec->output_section)
6242 return FALSE;
6243
6244 /* For relocatable sections, we can only simplify when the output
6245 section of the target is the same as the output section of the
6246 source. */
6247 if (link_info->relocatable
6248 && (target_sec->output_section != sec->output_section
6249 || is_reloc_sym_weak (abfd, irel)))
6250 return FALSE;
6251
6252 self_address = (sec->output_section->vma
6253 + sec->output_offset + irel->r_offset + 3);
6254 dest_address = (target_sec->output_section->vma
6255 + target_sec->output_offset + target_offset);
6256
6257 *is_reachable_p = pcrel_reloc_fits (direct_call_opcode, 0,
6258 self_address, dest_address);
6259
6260 if ((self_address >> CALL_SEGMENT_BITS) !=
6261 (dest_address >> CALL_SEGMENT_BITS))
6262 return FALSE;
6263
6264 return TRUE;
6265 }
6266
6267
6268 static Elf_Internal_Rela *
6269 find_associated_l32r_irel (bfd *abfd,
6270 asection *sec,
6271 bfd_byte *contents,
6272 Elf_Internal_Rela *other_irel,
6273 Elf_Internal_Rela *internal_relocs)
6274 {
6275 unsigned i;
6276
6277 for (i = 0; i < sec->reloc_count; i++)
6278 {
6279 Elf_Internal_Rela *irel = &internal_relocs[i];
6280
6281 if (irel == other_irel)
6282 continue;
6283 if (irel->r_offset != other_irel->r_offset)
6284 continue;
6285 if (is_l32r_relocation (abfd, sec, contents, irel))
6286 return irel;
6287 }
6288
6289 return NULL;
6290 }
6291
6292
6293 /* The compute_text_actions function will build a list of potential
6294 transformation actions for code in the extended basic block of each
6295 longcall that is optimized to a direct call. From this list we
6296 generate a set of actions to actually perform that optimizes for
6297 space and, if not using size_opt, maintains branch target
6298 alignments.
6299
6300 These actions to be performed are placed on a per-section list.
6301 The actual changes are performed by relax_section() in the second
6302 pass. */
6303
6304 bfd_boolean
6305 compute_text_actions (bfd *abfd,
6306 asection *sec,
6307 struct bfd_link_info *link_info)
6308 {
6309 xtensa_relax_info *relax_info;
6310 bfd_byte *contents;
6311 Elf_Internal_Rela *internal_relocs;
6312 bfd_boolean ok = TRUE;
6313 unsigned i;
6314 property_table_entry *prop_table = 0;
6315 int ptblsize = 0;
6316 bfd_size_type sec_size;
6317 static bfd_boolean no_insn_move = FALSE;
6318
6319 if (no_insn_move)
6320 return ok;
6321
6322 /* Do nothing if the section contains no optimized longcalls. */
6323 relax_info = get_xtensa_relax_info (sec);
6324 BFD_ASSERT (relax_info);
6325 if (!relax_info->is_relaxable_asm_section)
6326 return ok;
6327
6328 internal_relocs = retrieve_internal_relocs (abfd, sec,
6329 link_info->keep_memory);
6330
6331 if (internal_relocs)
6332 qsort (internal_relocs, sec->reloc_count, sizeof (Elf_Internal_Rela),
6333 internal_reloc_compare);
6334
6335 sec_size = bfd_get_section_limit (abfd, sec);
6336 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
6337 if (contents == NULL && sec_size != 0)
6338 {
6339 ok = FALSE;
6340 goto error_return;
6341 }
6342
6343 ptblsize = xtensa_read_table_entries (abfd, sec, &prop_table,
6344 XTENSA_PROP_SEC_NAME, FALSE);
6345 if (ptblsize < 0)
6346 {
6347 ok = FALSE;
6348 goto error_return;
6349 }
6350
6351 for (i = 0; i < sec->reloc_count; i++)
6352 {
6353 Elf_Internal_Rela *irel = &internal_relocs[i];
6354 bfd_vma r_offset;
6355 property_table_entry *the_entry;
6356 int ptbl_idx;
6357 ebb_t *ebb;
6358 ebb_constraint ebb_table;
6359 bfd_size_type simplify_size;
6360
6361 if (irel && ELF32_R_TYPE (irel->r_info) != R_XTENSA_ASM_SIMPLIFY)
6362 continue;
6363 r_offset = irel->r_offset;
6364
6365 simplify_size = get_asm_simplify_size (contents, sec_size, r_offset);
6366 if (simplify_size == 0)
6367 {
6368 (*_bfd_error_handler)
6369 (_("%B(%A+0x%lx): could not decode instruction for XTENSA_ASM_SIMPLIFY relocation; possible configuration mismatch"),
6370 sec->owner, sec, r_offset);
6371 continue;
6372 }
6373
6374 /* If the instruction table is not around, then don't do this
6375 relaxation. */
6376 the_entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
6377 sec->vma + irel->r_offset);
6378 if (the_entry == NULL || XTENSA_NO_NOP_REMOVAL)
6379 {
6380 text_action_add (&relax_info->action_list,
6381 ta_convert_longcall, sec, r_offset,
6382 0);
6383 continue;
6384 }
6385
6386 /* If the next longcall happens to be at the same address as an
6387 unreachable section of size 0, then skip forward. */
6388 ptbl_idx = the_entry - prop_table;
6389 while ((the_entry->flags & XTENSA_PROP_UNREACHABLE)
6390 && the_entry->size == 0
6391 && ptbl_idx + 1 < ptblsize
6392 && (prop_table[ptbl_idx + 1].address
6393 == prop_table[ptbl_idx].address))
6394 {
6395 ptbl_idx++;
6396 the_entry++;
6397 }
6398
6399 if (the_entry->flags & XTENSA_PROP_INSN_NO_TRANSFORM)
6400 /* NO_REORDER is OK */
6401 continue;
6402
6403 init_ebb_constraint (&ebb_table);
6404 ebb = &ebb_table.ebb;
6405 init_ebb (ebb, sec, contents, sec_size, prop_table, ptblsize,
6406 internal_relocs, sec->reloc_count);
6407 ebb->start_offset = r_offset + simplify_size;
6408 ebb->end_offset = r_offset + simplify_size;
6409 ebb->start_ptbl_idx = ptbl_idx;
6410 ebb->end_ptbl_idx = ptbl_idx;
6411 ebb->start_reloc_idx = i;
6412 ebb->end_reloc_idx = i;
6413
6414 if (!extend_ebb_bounds (ebb)
6415 || !compute_ebb_proposed_actions (&ebb_table)
6416 || !compute_ebb_actions (&ebb_table)
6417 || !check_section_ebb_pcrels_fit (abfd, sec, contents,
6418 internal_relocs, &ebb_table)
6419 || !check_section_ebb_reduces (&ebb_table))
6420 {
6421 /* If anything goes wrong or we get unlucky and something does
6422 not fit, with our plan because of expansion between
6423 critical branches, just convert to a NOP. */
6424
6425 text_action_add (&relax_info->action_list,
6426 ta_convert_longcall, sec, r_offset, 0);
6427 i = ebb_table.ebb.end_reloc_idx;
6428 free_ebb_constraint (&ebb_table);
6429 continue;
6430 }
6431
6432 text_action_add_proposed (&relax_info->action_list, &ebb_table, sec);
6433
6434 /* Update the index so we do not go looking at the relocations
6435 we have already processed. */
6436 i = ebb_table.ebb.end_reloc_idx;
6437 free_ebb_constraint (&ebb_table);
6438 }
6439
6440 #if DEBUG
6441 if (relax_info->action_list.head)
6442 print_action_list (stderr, &relax_info->action_list);
6443 #endif
6444
6445 error_return:
6446 release_contents (sec, contents);
6447 release_internal_relocs (sec, internal_relocs);
6448 if (prop_table)
6449 free (prop_table);
6450
6451 return ok;
6452 }
6453
6454
6455 /* Find all of the possible actions for an extended basic block. */
6456
6457 bfd_boolean
6458 compute_ebb_proposed_actions (ebb_constraint *ebb_table)
6459 {
6460 const ebb_t *ebb = &ebb_table->ebb;
6461 unsigned rel_idx = ebb->start_reloc_idx;
6462 property_table_entry *entry, *start_entry, *end_entry;
6463
6464 start_entry = &ebb->ptbl[ebb->start_ptbl_idx];
6465 end_entry = &ebb->ptbl[ebb->end_ptbl_idx];
6466
6467 for (entry = start_entry; entry <= end_entry; entry++)
6468 {
6469 bfd_vma offset, start_offset, end_offset;
6470 bfd_size_type insn_len;
6471
6472 start_offset = entry->address - ebb->sec->vma;
6473 end_offset = entry->address + entry->size - ebb->sec->vma;
6474
6475 if (entry == start_entry)
6476 start_offset = ebb->start_offset;
6477 if (entry == end_entry)
6478 end_offset = ebb->end_offset;
6479 offset = start_offset;
6480
6481 if (offset == entry->address - ebb->sec->vma
6482 && (entry->flags & XTENSA_PROP_INSN_BRANCH_TARGET) != 0)
6483 {
6484 enum ebb_target_enum align_type = EBB_DESIRE_TGT_ALIGN;
6485 BFD_ASSERT (offset != end_offset);
6486 if (offset == end_offset)
6487 return FALSE;
6488
6489 insn_len = insn_decode_len (ebb->contents, ebb->content_length,
6490 offset);
6491
6492 /* Propose no actions for a section with an undecodable offset. */
6493 if (insn_len == 0)
6494 {
6495 (*_bfd_error_handler)
6496 (_("%B(%A+0x%lx): could not decode instruction; possible configuration mismatch"),
6497 ebb->sec->owner, ebb->sec, offset);
6498 return FALSE;
6499 }
6500 if (check_branch_target_aligned_address (offset, insn_len))
6501 align_type = EBB_REQUIRE_TGT_ALIGN;
6502
6503 ebb_propose_action (ebb_table, align_type, 0,
6504 ta_none, offset, 0, TRUE);
6505 }
6506
6507 while (offset != end_offset)
6508 {
6509 Elf_Internal_Rela *irel;
6510 xtensa_opcode opcode;
6511
6512 while (rel_idx < ebb->end_reloc_idx
6513 && (ebb->relocs[rel_idx].r_offset < offset
6514 || (ebb->relocs[rel_idx].r_offset == offset
6515 && (ELF32_R_TYPE (ebb->relocs[rel_idx].r_info)
6516 != R_XTENSA_ASM_SIMPLIFY))))
6517 rel_idx++;
6518
6519 /* Check for longcall. */
6520 irel = &ebb->relocs[rel_idx];
6521 if (irel->r_offset == offset
6522 && ELF32_R_TYPE (irel->r_info) == R_XTENSA_ASM_SIMPLIFY)
6523 {
6524 bfd_size_type simplify_size;
6525
6526 simplify_size = get_asm_simplify_size (ebb->contents,
6527 ebb->content_length,
6528 irel->r_offset);
6529 if (simplify_size == 0)
6530 {
6531 (*_bfd_error_handler)
6532 (_("%B(%A+0x%lx): could not decode instruction for XTENSA_ASM_SIMPLIFY relocation; possible configuration mismatch"),
6533 ebb->sec->owner, ebb->sec, offset);
6534 return FALSE;
6535 }
6536
6537 ebb_propose_action (ebb_table, EBB_NO_ALIGN, 0,
6538 ta_convert_longcall, offset, 0, TRUE);
6539
6540 offset += simplify_size;
6541 continue;
6542 }
6543
6544 insn_len = insn_decode_len (ebb->contents, ebb->content_length,
6545 offset);
6546 /* If the instruction is undecodable, then report an error. */
6547 if (insn_len == 0)
6548 {
6549 (*_bfd_error_handler)
6550 (_("%B(%A+0x%lx): could not decode instruction; possible configuration mismatch"),
6551 ebb->sec->owner, ebb->sec, offset);
6552 return FALSE;
6553 }
6554
6555 if ((entry->flags & XTENSA_PROP_INSN_NO_DENSITY) == 0
6556 && (entry->flags & XTENSA_PROP_INSN_NO_TRANSFORM) == 0
6557 && narrow_instruction (ebb->contents, ebb->content_length,
6558 offset, FALSE))
6559 {
6560 /* Add an instruction narrow action. */
6561 ebb_propose_action (ebb_table, EBB_NO_ALIGN, 0,
6562 ta_narrow_insn, offset, 0, FALSE);
6563 offset += insn_len;
6564 continue;
6565 }
6566 if ((entry->flags & XTENSA_PROP_INSN_NO_TRANSFORM) == 0
6567 && widen_instruction (ebb->contents, ebb->content_length,
6568 offset, FALSE))
6569 {
6570 /* Add an instruction widen action. */
6571 ebb_propose_action (ebb_table, EBB_NO_ALIGN, 0,
6572 ta_widen_insn, offset, 0, FALSE);
6573 offset += insn_len;
6574 continue;
6575 }
6576 opcode = insn_decode_opcode (ebb->contents, ebb->content_length,
6577 offset, 0);
6578 if (xtensa_opcode_is_loop (xtensa_default_isa, opcode))
6579 {
6580 /* Check for branch targets. */
6581 ebb_propose_action (ebb_table, EBB_REQUIRE_LOOP_ALIGN, 0,
6582 ta_none, offset, 0, TRUE);
6583 offset += insn_len;
6584 continue;
6585 }
6586
6587 offset += insn_len;
6588 }
6589 }
6590
6591 if (ebb->ends_unreachable)
6592 {
6593 ebb_propose_action (ebb_table, EBB_NO_ALIGN, 0,
6594 ta_fill, ebb->end_offset, 0, TRUE);
6595 }
6596
6597 return TRUE;
6598 }
6599
6600
6601 /* After all of the information has collected about the
6602 transformations possible in an EBB, compute the appropriate actions
6603 here in compute_ebb_actions. We still must check later to make
6604 sure that the actions do not break any relocations. The algorithm
6605 used here is pretty greedy. Basically, it removes as many no-ops
6606 as possible so that the end of the EBB has the same alignment
6607 characteristics as the original. First, it uses narrowing, then
6608 fill space at the end of the EBB, and finally widenings. If that
6609 does not work, it tries again with one fewer no-op removed. The
6610 optimization will only be performed if all of the branch targets
6611 that were aligned before transformation are also aligned after the
6612 transformation.
6613
6614 When the size_opt flag is set, ignore the branch target alignments,
6615 narrow all wide instructions, and remove all no-ops unless the end
6616 of the EBB prevents it. */
6617
6618 bfd_boolean
6619 compute_ebb_actions (ebb_constraint *ebb_table)
6620 {
6621 unsigned i = 0;
6622 unsigned j;
6623 int removed_bytes = 0;
6624 ebb_t *ebb = &ebb_table->ebb;
6625 unsigned seg_idx_start = 0;
6626 unsigned seg_idx_end = 0;
6627
6628 /* We perform this like the assembler relaxation algorithm: Start by
6629 assuming all instructions are narrow and all no-ops removed; then
6630 walk through.... */
6631
6632 /* For each segment of this that has a solid constraint, check to
6633 see if there are any combinations that will keep the constraint.
6634 If so, use it. */
6635 for (seg_idx_end = 0; seg_idx_end < ebb_table->action_count; seg_idx_end++)
6636 {
6637 bfd_boolean requires_text_end_align = FALSE;
6638 unsigned longcall_count = 0;
6639 unsigned longcall_convert_count = 0;
6640 unsigned narrowable_count = 0;
6641 unsigned narrowable_convert_count = 0;
6642 unsigned widenable_count = 0;
6643 unsigned widenable_convert_count = 0;
6644
6645 proposed_action *action = NULL;
6646 int align = (1 << ebb_table->ebb.sec->alignment_power);
6647
6648 seg_idx_start = seg_idx_end;
6649
6650 for (i = seg_idx_start; i < ebb_table->action_count; i++)
6651 {
6652 action = &ebb_table->actions[i];
6653 if (action->action == ta_convert_longcall)
6654 longcall_count++;
6655 if (action->action == ta_narrow_insn)
6656 narrowable_count++;
6657 if (action->action == ta_widen_insn)
6658 widenable_count++;
6659 if (action->action == ta_fill)
6660 break;
6661 if (action->align_type == EBB_REQUIRE_LOOP_ALIGN)
6662 break;
6663 if (action->align_type == EBB_REQUIRE_TGT_ALIGN
6664 && !elf32xtensa_size_opt)
6665 break;
6666 }
6667 seg_idx_end = i;
6668
6669 if (seg_idx_end == ebb_table->action_count && !ebb->ends_unreachable)
6670 requires_text_end_align = TRUE;
6671
6672 if (elf32xtensa_size_opt && !requires_text_end_align
6673 && action->align_type != EBB_REQUIRE_LOOP_ALIGN
6674 && action->align_type != EBB_REQUIRE_TGT_ALIGN)
6675 {
6676 longcall_convert_count = longcall_count;
6677 narrowable_convert_count = narrowable_count;
6678 widenable_convert_count = 0;
6679 }
6680 else
6681 {
6682 /* There is a constraint. Convert the max number of longcalls. */
6683 narrowable_convert_count = 0;
6684 longcall_convert_count = 0;
6685 widenable_convert_count = 0;
6686
6687 for (j = 0; j < longcall_count; j++)
6688 {
6689 int removed = (longcall_count - j) * 3 & (align - 1);
6690 unsigned desire_narrow = (align - removed) & (align - 1);
6691 unsigned desire_widen = removed;
6692 if (desire_narrow <= narrowable_count)
6693 {
6694 narrowable_convert_count = desire_narrow;
6695 narrowable_convert_count +=
6696 (align * ((narrowable_count - narrowable_convert_count)
6697 / align));
6698 longcall_convert_count = (longcall_count - j);
6699 widenable_convert_count = 0;
6700 break;
6701 }
6702 if (desire_widen <= widenable_count && !elf32xtensa_size_opt)
6703 {
6704 narrowable_convert_count = 0;
6705 longcall_convert_count = longcall_count - j;
6706 widenable_convert_count = desire_widen;
6707 break;
6708 }
6709 }
6710 }
6711
6712 /* Now the number of conversions are saved. Do them. */
6713 for (i = seg_idx_start; i < seg_idx_end; i++)
6714 {
6715 action = &ebb_table->actions[i];
6716 switch (action->action)
6717 {
6718 case ta_convert_longcall:
6719 if (longcall_convert_count != 0)
6720 {
6721 action->action = ta_remove_longcall;
6722 action->do_action = TRUE;
6723 action->removed_bytes += 3;
6724 longcall_convert_count--;
6725 }
6726 break;
6727 case ta_narrow_insn:
6728 if (narrowable_convert_count != 0)
6729 {
6730 action->do_action = TRUE;
6731 action->removed_bytes += 1;
6732 narrowable_convert_count--;
6733 }
6734 break;
6735 case ta_widen_insn:
6736 if (widenable_convert_count != 0)
6737 {
6738 action->do_action = TRUE;
6739 action->removed_bytes -= 1;
6740 widenable_convert_count--;
6741 }
6742 break;
6743 default:
6744 break;
6745 }
6746 }
6747 }
6748
6749 /* Now we move on to some local opts. Try to remove each of the
6750 remaining longcalls. */
6751
6752 if (ebb_table->ebb.ends_section || ebb_table->ebb.ends_unreachable)
6753 {
6754 removed_bytes = 0;
6755 for (i = 0; i < ebb_table->action_count; i++)
6756 {
6757 int old_removed_bytes = removed_bytes;
6758 proposed_action *action = &ebb_table->actions[i];
6759
6760 if (action->do_action && action->action == ta_convert_longcall)
6761 {
6762 bfd_boolean bad_alignment = FALSE;
6763 removed_bytes += 3;
6764 for (j = i + 1; j < ebb_table->action_count; j++)
6765 {
6766 proposed_action *new_action = &ebb_table->actions[j];
6767 bfd_vma offset = new_action->offset;
6768 if (new_action->align_type == EBB_REQUIRE_TGT_ALIGN)
6769 {
6770 if (!check_branch_target_aligned
6771 (ebb_table->ebb.contents,
6772 ebb_table->ebb.content_length,
6773 offset, offset - removed_bytes))
6774 {
6775 bad_alignment = TRUE;
6776 break;
6777 }
6778 }
6779 if (new_action->align_type == EBB_REQUIRE_LOOP_ALIGN)
6780 {
6781 if (!check_loop_aligned (ebb_table->ebb.contents,
6782 ebb_table->ebb.content_length,
6783 offset,
6784 offset - removed_bytes))
6785 {
6786 bad_alignment = TRUE;
6787 break;
6788 }
6789 }
6790 if (new_action->action == ta_narrow_insn
6791 && !new_action->do_action
6792 && ebb_table->ebb.sec->alignment_power == 2)
6793 {
6794 /* Narrow an instruction and we are done. */
6795 new_action->do_action = TRUE;
6796 new_action->removed_bytes += 1;
6797 bad_alignment = FALSE;
6798 break;
6799 }
6800 if (new_action->action == ta_widen_insn
6801 && new_action->do_action
6802 && ebb_table->ebb.sec->alignment_power == 2)
6803 {
6804 /* Narrow an instruction and we are done. */
6805 new_action->do_action = FALSE;
6806 new_action->removed_bytes += 1;
6807 bad_alignment = FALSE;
6808 break;
6809 }
6810 }
6811 if (!bad_alignment)
6812 {
6813 action->removed_bytes += 3;
6814 action->action = ta_remove_longcall;
6815 action->do_action = TRUE;
6816 }
6817 }
6818 removed_bytes = old_removed_bytes;
6819 if (action->do_action)
6820 removed_bytes += action->removed_bytes;
6821 }
6822 }
6823
6824 removed_bytes = 0;
6825 for (i = 0; i < ebb_table->action_count; ++i)
6826 {
6827 proposed_action *action = &ebb_table->actions[i];
6828 if (action->do_action)
6829 removed_bytes += action->removed_bytes;
6830 }
6831
6832 if ((removed_bytes % (1 << ebb_table->ebb.sec->alignment_power)) != 0
6833 && ebb->ends_unreachable)
6834 {
6835 proposed_action *action;
6836 int br;
6837 int extra_space;
6838
6839 BFD_ASSERT (ebb_table->action_count != 0);
6840 action = &ebb_table->actions[ebb_table->action_count - 1];
6841 BFD_ASSERT (action->action == ta_fill);
6842 BFD_ASSERT (ebb->ends_unreachable->flags & XTENSA_PROP_UNREACHABLE);
6843
6844 extra_space = compute_fill_extra_space (ebb->ends_unreachable);
6845 br = action->removed_bytes + removed_bytes + extra_space;
6846 br = br & ((1 << ebb->sec->alignment_power ) - 1);
6847
6848 action->removed_bytes = extra_space - br;
6849 }
6850 return TRUE;
6851 }
6852
6853
6854 /* Use check_section_ebb_pcrels_fit to make sure that all of the
6855 relocations in a section will fit if a proposed set of actions
6856 are performed. */
6857
6858 static bfd_boolean
6859 check_section_ebb_pcrels_fit (bfd *abfd,
6860 asection *sec,
6861 bfd_byte *contents,
6862 Elf_Internal_Rela *internal_relocs,
6863 const ebb_constraint *constraint)
6864 {
6865 unsigned i, j;
6866 Elf_Internal_Rela *irel;
6867 xtensa_relax_info *relax_info;
6868
6869 relax_info = get_xtensa_relax_info (sec);
6870
6871 for (i = 0; i < sec->reloc_count; i++)
6872 {
6873 r_reloc r_rel;
6874 bfd_vma orig_self_offset, orig_target_offset;
6875 bfd_vma self_offset, target_offset;
6876 int r_type;
6877 reloc_howto_type *howto;
6878 int self_removed_bytes, target_removed_bytes;
6879
6880 irel = &internal_relocs[i];
6881 r_type = ELF32_R_TYPE (irel->r_info);
6882
6883 howto = &elf_howto_table[r_type];
6884 /* We maintain the required invariant: PC-relative relocations
6885 that fit before linking must fit after linking. Thus we only
6886 need to deal with relocations to the same section that are
6887 PC-relative. */
6888 if (ELF32_R_TYPE (irel->r_info) == R_XTENSA_ASM_SIMPLIFY
6889 || !howto->pc_relative)
6890 continue;
6891
6892 r_reloc_init (&r_rel, abfd, irel, contents,
6893 bfd_get_section_limit (abfd, sec));
6894
6895 if (r_reloc_get_section (&r_rel) != sec)
6896 continue;
6897
6898 orig_self_offset = irel->r_offset;
6899 orig_target_offset = r_rel.target_offset;
6900
6901 self_offset = orig_self_offset;
6902 target_offset = orig_target_offset;
6903
6904 if (relax_info)
6905 {
6906 self_offset = offset_with_removed_text (&relax_info->action_list,
6907 orig_self_offset);
6908 target_offset = offset_with_removed_text (&relax_info->action_list,
6909 orig_target_offset);
6910 }
6911
6912 self_removed_bytes = 0;
6913 target_removed_bytes = 0;
6914
6915 for (j = 0; j < constraint->action_count; ++j)
6916 {
6917 proposed_action *action = &constraint->actions[j];
6918 bfd_vma offset = action->offset;
6919 int removed_bytes = action->removed_bytes;
6920 if (offset < orig_self_offset
6921 || (offset == orig_self_offset && action->action == ta_fill
6922 && action->removed_bytes < 0))
6923 self_removed_bytes += removed_bytes;
6924 if (offset < orig_target_offset
6925 || (offset == orig_target_offset && action->action == ta_fill
6926 && action->removed_bytes < 0))
6927 target_removed_bytes += removed_bytes;
6928 }
6929 self_offset -= self_removed_bytes;
6930 target_offset -= target_removed_bytes;
6931
6932 /* Try to encode it. Get the operand and check. */
6933 if (is_alt_relocation (ELF32_R_TYPE (irel->r_info)))
6934 {
6935 /* None of the current alternate relocs are PC-relative,
6936 and only PC-relative relocs matter here. */
6937 }
6938 else
6939 {
6940 xtensa_opcode opcode;
6941 int opnum;
6942
6943 opcode = get_relocation_opcode (abfd, sec, contents, irel);
6944 if (opcode == XTENSA_UNDEFINED)
6945 return FALSE;
6946
6947 opnum = get_relocation_opnd (opcode, ELF32_R_TYPE (irel->r_info));
6948 if (opnum == XTENSA_UNDEFINED)
6949 return FALSE;
6950
6951 if (!pcrel_reloc_fits (opcode, opnum, self_offset, target_offset))
6952 return FALSE;
6953 }
6954 }
6955
6956 return TRUE;
6957 }
6958
6959
6960 static bfd_boolean
6961 check_section_ebb_reduces (const ebb_constraint *constraint)
6962 {
6963 int removed = 0;
6964 unsigned i;
6965
6966 for (i = 0; i < constraint->action_count; i++)
6967 {
6968 const proposed_action *action = &constraint->actions[i];
6969 if (action->do_action)
6970 removed += action->removed_bytes;
6971 }
6972 if (removed < 0)
6973 return FALSE;
6974
6975 return TRUE;
6976 }
6977
6978
6979 void
6980 text_action_add_proposed (text_action_list *l,
6981 const ebb_constraint *ebb_table,
6982 asection *sec)
6983 {
6984 unsigned i;
6985
6986 for (i = 0; i < ebb_table->action_count; i++)
6987 {
6988 proposed_action *action = &ebb_table->actions[i];
6989
6990 if (!action->do_action)
6991 continue;
6992 switch (action->action)
6993 {
6994 case ta_remove_insn:
6995 case ta_remove_longcall:
6996 case ta_convert_longcall:
6997 case ta_narrow_insn:
6998 case ta_widen_insn:
6999 case ta_fill:
7000 case ta_remove_literal:
7001 text_action_add (l, action->action, sec, action->offset,
7002 action->removed_bytes);
7003 break;
7004 case ta_none:
7005 break;
7006 default:
7007 BFD_ASSERT (0);
7008 break;
7009 }
7010 }
7011 }
7012
7013
7014 int
7015 compute_fill_extra_space (property_table_entry *entry)
7016 {
7017 int fill_extra_space;
7018
7019 if (!entry)
7020 return 0;
7021
7022 if ((entry->flags & XTENSA_PROP_UNREACHABLE) == 0)
7023 return 0;
7024
7025 fill_extra_space = entry->size;
7026 if ((entry->flags & XTENSA_PROP_ALIGN) != 0)
7027 {
7028 /* Fill bytes for alignment:
7029 (2**n)-1 - (addr + (2**n)-1) & (2**n -1) */
7030 int pow = GET_XTENSA_PROP_ALIGNMENT (entry->flags);
7031 int nsm = (1 << pow) - 1;
7032 bfd_vma addr = entry->address + entry->size;
7033 bfd_vma align_fill = nsm - ((addr + nsm) & nsm);
7034 fill_extra_space += align_fill;
7035 }
7036 return fill_extra_space;
7037 }
7038
7039 \f
7040 /* First relaxation pass. */
7041
7042 /* If the section contains relaxable literals, check each literal to
7043 see if it has the same value as another literal that has already
7044 been seen, either in the current section or a previous one. If so,
7045 add an entry to the per-section list of removed literals. The
7046 actual changes are deferred until the next pass. */
7047
7048 static bfd_boolean
7049 compute_removed_literals (bfd *abfd,
7050 asection *sec,
7051 struct bfd_link_info *link_info,
7052 value_map_hash_table *values)
7053 {
7054 xtensa_relax_info *relax_info;
7055 bfd_byte *contents;
7056 Elf_Internal_Rela *internal_relocs;
7057 source_reloc *src_relocs, *rel;
7058 bfd_boolean ok = TRUE;
7059 property_table_entry *prop_table = NULL;
7060 int ptblsize;
7061 int i, prev_i;
7062 bfd_boolean last_loc_is_prev = FALSE;
7063 bfd_vma last_target_offset = 0;
7064 section_cache_t target_sec_cache;
7065 bfd_size_type sec_size;
7066
7067 init_section_cache (&target_sec_cache);
7068
7069 /* Do nothing if it is not a relaxable literal section. */
7070 relax_info = get_xtensa_relax_info (sec);
7071 BFD_ASSERT (relax_info);
7072 if (!relax_info->is_relaxable_literal_section)
7073 return ok;
7074
7075 internal_relocs = retrieve_internal_relocs (abfd, sec,
7076 link_info->keep_memory);
7077
7078 sec_size = bfd_get_section_limit (abfd, sec);
7079 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
7080 if (contents == NULL && sec_size != 0)
7081 {
7082 ok = FALSE;
7083 goto error_return;
7084 }
7085
7086 /* Sort the source_relocs by target offset. */
7087 src_relocs = relax_info->src_relocs;
7088 qsort (src_relocs, relax_info->src_count,
7089 sizeof (source_reloc), source_reloc_compare);
7090 qsort (internal_relocs, sec->reloc_count, sizeof (Elf_Internal_Rela),
7091 internal_reloc_compare);
7092
7093 ptblsize = xtensa_read_table_entries (abfd, sec, &prop_table,
7094 XTENSA_PROP_SEC_NAME, FALSE);
7095 if (ptblsize < 0)
7096 {
7097 ok = FALSE;
7098 goto error_return;
7099 }
7100
7101 prev_i = -1;
7102 for (i = 0; i < relax_info->src_count; i++)
7103 {
7104 Elf_Internal_Rela *irel = NULL;
7105
7106 rel = &src_relocs[i];
7107 if (get_l32r_opcode () != rel->opcode)
7108 continue;
7109 irel = get_irel_at_offset (sec, internal_relocs,
7110 rel->r_rel.target_offset);
7111
7112 /* If the relocation on this is not a simple R_XTENSA_32 or
7113 R_XTENSA_PLT then do not consider it. This may happen when
7114 the difference of two symbols is used in a literal. */
7115 if (irel && (ELF32_R_TYPE (irel->r_info) != R_XTENSA_32
7116 && ELF32_R_TYPE (irel->r_info) != R_XTENSA_PLT))
7117 continue;
7118
7119 /* If the target_offset for this relocation is the same as the
7120 previous relocation, then we've already considered whether the
7121 literal can be coalesced. Skip to the next one.... */
7122 if (i != 0 && prev_i != -1
7123 && src_relocs[i-1].r_rel.target_offset == rel->r_rel.target_offset)
7124 continue;
7125 prev_i = i;
7126
7127 if (last_loc_is_prev &&
7128 last_target_offset + 4 != rel->r_rel.target_offset)
7129 last_loc_is_prev = FALSE;
7130
7131 /* Check if the relocation was from an L32R that is being removed
7132 because a CALLX was converted to a direct CALL, and check if
7133 there are no other relocations to the literal. */
7134 if (is_removable_literal (rel, i, src_relocs, relax_info->src_count))
7135 {
7136 if (!remove_dead_literal (abfd, sec, link_info, internal_relocs,
7137 irel, rel, prop_table, ptblsize))
7138 {
7139 ok = FALSE;
7140 goto error_return;
7141 }
7142 last_target_offset = rel->r_rel.target_offset;
7143 continue;
7144 }
7145
7146 if (!identify_literal_placement (abfd, sec, contents, link_info,
7147 values,
7148 &last_loc_is_prev, irel,
7149 relax_info->src_count - i, rel,
7150 prop_table, ptblsize,
7151 &target_sec_cache, rel->is_abs_literal))
7152 {
7153 ok = FALSE;
7154 goto error_return;
7155 }
7156 last_target_offset = rel->r_rel.target_offset;
7157 }
7158
7159 #if DEBUG
7160 print_removed_literals (stderr, &relax_info->removed_list);
7161 print_action_list (stderr, &relax_info->action_list);
7162 #endif /* DEBUG */
7163
7164 error_return:
7165 if (prop_table) free (prop_table);
7166 clear_section_cache (&target_sec_cache);
7167
7168 release_contents (sec, contents);
7169 release_internal_relocs (sec, internal_relocs);
7170 return ok;
7171 }
7172
7173
7174 static Elf_Internal_Rela *
7175 get_irel_at_offset (asection *sec,
7176 Elf_Internal_Rela *internal_relocs,
7177 bfd_vma offset)
7178 {
7179 unsigned i;
7180 Elf_Internal_Rela *irel;
7181 unsigned r_type;
7182 Elf_Internal_Rela key;
7183
7184 if (!internal_relocs)
7185 return NULL;
7186
7187 key.r_offset = offset;
7188 irel = bsearch (&key, internal_relocs, sec->reloc_count,
7189 sizeof (Elf_Internal_Rela), internal_reloc_matches);
7190 if (!irel)
7191 return NULL;
7192
7193 /* bsearch does not guarantee which will be returned if there are
7194 multiple matches. We need the first that is not an alignment. */
7195 i = irel - internal_relocs;
7196 while (i > 0)
7197 {
7198 if (internal_relocs[i-1].r_offset != offset)
7199 break;
7200 i--;
7201 }
7202 for ( ; i < sec->reloc_count; i++)
7203 {
7204 irel = &internal_relocs[i];
7205 r_type = ELF32_R_TYPE (irel->r_info);
7206 if (irel->r_offset == offset && r_type != R_XTENSA_NONE)
7207 return irel;
7208 }
7209
7210 return NULL;
7211 }
7212
7213
7214 bfd_boolean
7215 is_removable_literal (const source_reloc *rel,
7216 int i,
7217 const source_reloc *src_relocs,
7218 int src_count)
7219 {
7220 const source_reloc *curr_rel;
7221 if (!rel->is_null)
7222 return FALSE;
7223
7224 for (++i; i < src_count; ++i)
7225 {
7226 curr_rel = &src_relocs[i];
7227 /* If all others have the same target offset.... */
7228 if (curr_rel->r_rel.target_offset != rel->r_rel.target_offset)
7229 return TRUE;
7230
7231 if (!curr_rel->is_null
7232 && !xtensa_is_property_section (curr_rel->source_sec)
7233 && !(curr_rel->source_sec->flags & SEC_DEBUGGING))
7234 return FALSE;
7235 }
7236 return TRUE;
7237 }
7238
7239
7240 bfd_boolean
7241 remove_dead_literal (bfd *abfd,
7242 asection *sec,
7243 struct bfd_link_info *link_info,
7244 Elf_Internal_Rela *internal_relocs,
7245 Elf_Internal_Rela *irel,
7246 source_reloc *rel,
7247 property_table_entry *prop_table,
7248 int ptblsize)
7249 {
7250 property_table_entry *entry;
7251 xtensa_relax_info *relax_info;
7252
7253 relax_info = get_xtensa_relax_info (sec);
7254 if (!relax_info)
7255 return FALSE;
7256
7257 entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
7258 sec->vma + rel->r_rel.target_offset);
7259
7260 /* Mark the unused literal so that it will be removed. */
7261 add_removed_literal (&relax_info->removed_list, &rel->r_rel, NULL);
7262
7263 text_action_add (&relax_info->action_list,
7264 ta_remove_literal, sec, rel->r_rel.target_offset, 4);
7265
7266 /* If the section is 4-byte aligned, do not add fill. */
7267 if (sec->alignment_power > 2)
7268 {
7269 int fill_extra_space;
7270 bfd_vma entry_sec_offset;
7271 text_action *fa;
7272 property_table_entry *the_add_entry;
7273 int removed_diff;
7274
7275 if (entry)
7276 entry_sec_offset = entry->address - sec->vma + entry->size;
7277 else
7278 entry_sec_offset = rel->r_rel.target_offset + 4;
7279
7280 /* If the literal range is at the end of the section,
7281 do not add fill. */
7282 the_add_entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
7283 entry_sec_offset);
7284 fill_extra_space = compute_fill_extra_space (the_add_entry);
7285
7286 fa = find_fill_action (&relax_info->action_list, sec, entry_sec_offset);
7287 removed_diff = compute_removed_action_diff (fa, sec, entry_sec_offset,
7288 -4, fill_extra_space);
7289 if (fa)
7290 adjust_fill_action (fa, removed_diff);
7291 else
7292 text_action_add (&relax_info->action_list,
7293 ta_fill, sec, entry_sec_offset, removed_diff);
7294 }
7295
7296 /* Zero out the relocation on this literal location. */
7297 if (irel)
7298 {
7299 if (elf_hash_table (link_info)->dynamic_sections_created)
7300 shrink_dynamic_reloc_sections (link_info, abfd, sec, irel);
7301
7302 irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
7303 pin_internal_relocs (sec, internal_relocs);
7304 }
7305
7306 /* Do not modify "last_loc_is_prev". */
7307 return TRUE;
7308 }
7309
7310
7311 bfd_boolean
7312 identify_literal_placement (bfd *abfd,
7313 asection *sec,
7314 bfd_byte *contents,
7315 struct bfd_link_info *link_info,
7316 value_map_hash_table *values,
7317 bfd_boolean *last_loc_is_prev_p,
7318 Elf_Internal_Rela *irel,
7319 int remaining_src_rels,
7320 source_reloc *rel,
7321 property_table_entry *prop_table,
7322 int ptblsize,
7323 section_cache_t *target_sec_cache,
7324 bfd_boolean is_abs_literal)
7325 {
7326 literal_value val;
7327 value_map *val_map;
7328 xtensa_relax_info *relax_info;
7329 bfd_boolean literal_placed = FALSE;
7330 r_reloc r_rel;
7331 unsigned long value;
7332 bfd_boolean final_static_link;
7333 bfd_size_type sec_size;
7334
7335 relax_info = get_xtensa_relax_info (sec);
7336 if (!relax_info)
7337 return FALSE;
7338
7339 sec_size = bfd_get_section_limit (abfd, sec);
7340
7341 final_static_link =
7342 (!link_info->relocatable
7343 && !elf_hash_table (link_info)->dynamic_sections_created);
7344
7345 /* The placement algorithm first checks to see if the literal is
7346 already in the value map. If so and the value map is reachable
7347 from all uses, then the literal is moved to that location. If
7348 not, then we identify the last location where a fresh literal was
7349 placed. If the literal can be safely moved there, then we do so.
7350 If not, then we assume that the literal is not to move and leave
7351 the literal where it is, marking it as the last literal
7352 location. */
7353
7354 /* Find the literal value. */
7355 value = 0;
7356 r_reloc_init (&r_rel, abfd, irel, contents, sec_size);
7357 if (!irel)
7358 {
7359 BFD_ASSERT (rel->r_rel.target_offset < sec_size);
7360 value = bfd_get_32 (abfd, contents + rel->r_rel.target_offset);
7361 }
7362 init_literal_value (&val, &r_rel, value, is_abs_literal);
7363
7364 /* Check if we've seen another literal with the same value that
7365 is in the same output section. */
7366 val_map = value_map_get_cached_value (values, &val, final_static_link);
7367
7368 if (val_map
7369 && (r_reloc_get_section (&val_map->loc)->output_section
7370 == sec->output_section)
7371 && relocations_reach (rel, remaining_src_rels, &val_map->loc)
7372 && coalesce_shared_literal (sec, rel, prop_table, ptblsize, val_map))
7373 {
7374 /* No change to last_loc_is_prev. */
7375 literal_placed = TRUE;
7376 }
7377
7378 /* For relocatable links, do not try to move literals. To do it
7379 correctly might increase the number of relocations in an input
7380 section making the default relocatable linking fail. */
7381 if (!link_info->relocatable && !literal_placed
7382 && values->has_last_loc && !(*last_loc_is_prev_p))
7383 {
7384 asection *target_sec = r_reloc_get_section (&values->last_loc);
7385 if (target_sec && target_sec->output_section == sec->output_section)
7386 {
7387 /* Increment the virtual offset. */
7388 r_reloc try_loc = values->last_loc;
7389 try_loc.virtual_offset += 4;
7390
7391 /* There is a last loc that was in the same output section. */
7392 if (relocations_reach (rel, remaining_src_rels, &try_loc)
7393 && move_shared_literal (sec, link_info, rel,
7394 prop_table, ptblsize,
7395 &try_loc, &val, target_sec_cache))
7396 {
7397 values->last_loc.virtual_offset += 4;
7398 literal_placed = TRUE;
7399 if (!val_map)
7400 val_map = add_value_map (values, &val, &try_loc,
7401 final_static_link);
7402 else
7403 val_map->loc = try_loc;
7404 }
7405 }
7406 }
7407
7408 if (!literal_placed)
7409 {
7410 /* Nothing worked, leave the literal alone but update the last loc. */
7411 values->has_last_loc = TRUE;
7412 values->last_loc = rel->r_rel;
7413 if (!val_map)
7414 val_map = add_value_map (values, &val, &rel->r_rel, final_static_link);
7415 else
7416 val_map->loc = rel->r_rel;
7417 *last_loc_is_prev_p = TRUE;
7418 }
7419
7420 return TRUE;
7421 }
7422
7423
7424 /* Check if the original relocations (presumably on L32R instructions)
7425 identified by reloc[0..N] can be changed to reference the literal
7426 identified by r_rel. If r_rel is out of range for any of the
7427 original relocations, then we don't want to coalesce the original
7428 literal with the one at r_rel. We only check reloc[0..N], where the
7429 offsets are all the same as for reloc[0] (i.e., they're all
7430 referencing the same literal) and where N is also bounded by the
7431 number of remaining entries in the "reloc" array. The "reloc" array
7432 is sorted by target offset so we know all the entries for the same
7433 literal will be contiguous. */
7434
7435 static bfd_boolean
7436 relocations_reach (source_reloc *reloc,
7437 int remaining_relocs,
7438 const r_reloc *r_rel)
7439 {
7440 bfd_vma from_offset, source_address, dest_address;
7441 asection *sec;
7442 int i;
7443
7444 if (!r_reloc_is_defined (r_rel))
7445 return FALSE;
7446
7447 sec = r_reloc_get_section (r_rel);
7448 from_offset = reloc[0].r_rel.target_offset;
7449
7450 for (i = 0; i < remaining_relocs; i++)
7451 {
7452 if (reloc[i].r_rel.target_offset != from_offset)
7453 break;
7454
7455 /* Ignore relocations that have been removed. */
7456 if (reloc[i].is_null)
7457 continue;
7458
7459 /* The original and new output section for these must be the same
7460 in order to coalesce. */
7461 if (r_reloc_get_section (&reloc[i].r_rel)->output_section
7462 != sec->output_section)
7463 return FALSE;
7464
7465 /* A literal with no PC-relative relocations can be moved anywhere. */
7466 if (reloc[i].opnd != -1)
7467 {
7468 /* Otherwise, check to see that it fits. */
7469 source_address = (reloc[i].source_sec->output_section->vma
7470 + reloc[i].source_sec->output_offset
7471 + reloc[i].r_rel.rela.r_offset);
7472 dest_address = (sec->output_section->vma
7473 + sec->output_offset
7474 + r_rel->target_offset);
7475
7476 if (!pcrel_reloc_fits (reloc[i].opcode, reloc[i].opnd,
7477 source_address, dest_address))
7478 return FALSE;
7479 }
7480 }
7481
7482 return TRUE;
7483 }
7484
7485
7486 /* Move a literal to another literal location because it is
7487 the same as the other literal value. */
7488
7489 static bfd_boolean
7490 coalesce_shared_literal (asection *sec,
7491 source_reloc *rel,
7492 property_table_entry *prop_table,
7493 int ptblsize,
7494 value_map *val_map)
7495 {
7496 property_table_entry *entry;
7497 text_action *fa;
7498 property_table_entry *the_add_entry;
7499 int removed_diff;
7500 xtensa_relax_info *relax_info;
7501
7502 relax_info = get_xtensa_relax_info (sec);
7503 if (!relax_info)
7504 return FALSE;
7505
7506 entry = elf_xtensa_find_property_entry
7507 (prop_table, ptblsize, sec->vma + rel->r_rel.target_offset);
7508 if (entry && (entry->flags & XTENSA_PROP_INSN_NO_TRANSFORM))
7509 return TRUE;
7510
7511 /* Mark that the literal will be coalesced. */
7512 add_removed_literal (&relax_info->removed_list, &rel->r_rel, &val_map->loc);
7513
7514 text_action_add (&relax_info->action_list,
7515 ta_remove_literal, sec, rel->r_rel.target_offset, 4);
7516
7517 /* If the section is 4-byte aligned, do not add fill. */
7518 if (sec->alignment_power > 2)
7519 {
7520 int fill_extra_space;
7521 bfd_vma entry_sec_offset;
7522
7523 if (entry)
7524 entry_sec_offset = entry->address - sec->vma + entry->size;
7525 else
7526 entry_sec_offset = rel->r_rel.target_offset + 4;
7527
7528 /* If the literal range is at the end of the section,
7529 do not add fill. */
7530 fill_extra_space = 0;
7531 the_add_entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
7532 entry_sec_offset);
7533 if (the_add_entry && (the_add_entry->flags & XTENSA_PROP_UNREACHABLE))
7534 fill_extra_space = the_add_entry->size;
7535
7536 fa = find_fill_action (&relax_info->action_list, sec, entry_sec_offset);
7537 removed_diff = compute_removed_action_diff (fa, sec, entry_sec_offset,
7538 -4, fill_extra_space);
7539 if (fa)
7540 adjust_fill_action (fa, removed_diff);
7541 else
7542 text_action_add (&relax_info->action_list,
7543 ta_fill, sec, entry_sec_offset, removed_diff);
7544 }
7545
7546 return TRUE;
7547 }
7548
7549
7550 /* Move a literal to another location. This may actually increase the
7551 total amount of space used because of alignments so we need to do
7552 this carefully. Also, it may make a branch go out of range. */
7553
7554 static bfd_boolean
7555 move_shared_literal (asection *sec,
7556 struct bfd_link_info *link_info,
7557 source_reloc *rel,
7558 property_table_entry *prop_table,
7559 int ptblsize,
7560 const r_reloc *target_loc,
7561 const literal_value *lit_value,
7562 section_cache_t *target_sec_cache)
7563 {
7564 property_table_entry *the_add_entry, *src_entry, *target_entry = NULL;
7565 text_action *fa, *target_fa;
7566 int removed_diff;
7567 xtensa_relax_info *relax_info, *target_relax_info;
7568 asection *target_sec;
7569 ebb_t *ebb;
7570 ebb_constraint ebb_table;
7571 bfd_boolean relocs_fit;
7572
7573 /* If this routine always returns FALSE, the literals that cannot be
7574 coalesced will not be moved. */
7575 if (elf32xtensa_no_literal_movement)
7576 return FALSE;
7577
7578 relax_info = get_xtensa_relax_info (sec);
7579 if (!relax_info)
7580 return FALSE;
7581
7582 target_sec = r_reloc_get_section (target_loc);
7583 target_relax_info = get_xtensa_relax_info (target_sec);
7584
7585 /* Literals to undefined sections may not be moved because they
7586 must report an error. */
7587 if (bfd_is_und_section (target_sec))
7588 return FALSE;
7589
7590 src_entry = elf_xtensa_find_property_entry
7591 (prop_table, ptblsize, sec->vma + rel->r_rel.target_offset);
7592
7593 if (!section_cache_section (target_sec_cache, target_sec, link_info))
7594 return FALSE;
7595
7596 target_entry = elf_xtensa_find_property_entry
7597 (target_sec_cache->ptbl, target_sec_cache->pte_count,
7598 target_sec->vma + target_loc->target_offset);
7599
7600 if (!target_entry)
7601 return FALSE;
7602
7603 /* Make sure that we have not broken any branches. */
7604 relocs_fit = FALSE;
7605
7606 init_ebb_constraint (&ebb_table);
7607 ebb = &ebb_table.ebb;
7608 init_ebb (ebb, target_sec_cache->sec, target_sec_cache->contents,
7609 target_sec_cache->content_length,
7610 target_sec_cache->ptbl, target_sec_cache->pte_count,
7611 target_sec_cache->relocs, target_sec_cache->reloc_count);
7612
7613 /* Propose to add 4 bytes + worst-case alignment size increase to
7614 destination. */
7615 ebb_propose_action (&ebb_table, EBB_NO_ALIGN, 0,
7616 ta_fill, target_loc->target_offset,
7617 -4 - (1 << target_sec->alignment_power), TRUE);
7618
7619 /* Check all of the PC-relative relocations to make sure they still fit. */
7620 relocs_fit = check_section_ebb_pcrels_fit (target_sec->owner, target_sec,
7621 target_sec_cache->contents,
7622 target_sec_cache->relocs,
7623 &ebb_table);
7624
7625 if (!relocs_fit)
7626 return FALSE;
7627
7628 text_action_add_literal (&target_relax_info->action_list,
7629 ta_add_literal, target_loc, lit_value, -4);
7630
7631 if (target_sec->alignment_power > 2 && target_entry != src_entry)
7632 {
7633 /* May need to add or remove some fill to maintain alignment. */
7634 int fill_extra_space;
7635 bfd_vma entry_sec_offset;
7636
7637 entry_sec_offset =
7638 target_entry->address - target_sec->vma + target_entry->size;
7639
7640 /* If the literal range is at the end of the section,
7641 do not add fill. */
7642 fill_extra_space = 0;
7643 the_add_entry =
7644 elf_xtensa_find_property_entry (target_sec_cache->ptbl,
7645 target_sec_cache->pte_count,
7646 entry_sec_offset);
7647 if (the_add_entry && (the_add_entry->flags & XTENSA_PROP_UNREACHABLE))
7648 fill_extra_space = the_add_entry->size;
7649
7650 target_fa = find_fill_action (&target_relax_info->action_list,
7651 target_sec, entry_sec_offset);
7652 removed_diff = compute_removed_action_diff (target_fa, target_sec,
7653 entry_sec_offset, 4,
7654 fill_extra_space);
7655 if (target_fa)
7656 adjust_fill_action (target_fa, removed_diff);
7657 else
7658 text_action_add (&target_relax_info->action_list,
7659 ta_fill, target_sec, entry_sec_offset, removed_diff);
7660 }
7661
7662 /* Mark that the literal will be moved to the new location. */
7663 add_removed_literal (&relax_info->removed_list, &rel->r_rel, target_loc);
7664
7665 /* Remove the literal. */
7666 text_action_add (&relax_info->action_list,
7667 ta_remove_literal, sec, rel->r_rel.target_offset, 4);
7668
7669 /* If the section is 4-byte aligned, do not add fill. */
7670 if (sec->alignment_power > 2 && target_entry != src_entry)
7671 {
7672 int fill_extra_space;
7673 bfd_vma entry_sec_offset;
7674
7675 if (src_entry)
7676 entry_sec_offset = src_entry->address - sec->vma + src_entry->size;
7677 else
7678 entry_sec_offset = rel->r_rel.target_offset+4;
7679
7680 /* If the literal range is at the end of the section,
7681 do not add fill. */
7682 fill_extra_space = 0;
7683 the_add_entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
7684 entry_sec_offset);
7685 if (the_add_entry && (the_add_entry->flags & XTENSA_PROP_UNREACHABLE))
7686 fill_extra_space = the_add_entry->size;
7687
7688 fa = find_fill_action (&relax_info->action_list, sec, entry_sec_offset);
7689 removed_diff = compute_removed_action_diff (fa, sec, entry_sec_offset,
7690 -4, fill_extra_space);
7691 if (fa)
7692 adjust_fill_action (fa, removed_diff);
7693 else
7694 text_action_add (&relax_info->action_list,
7695 ta_fill, sec, entry_sec_offset, removed_diff);
7696 }
7697
7698 return TRUE;
7699 }
7700
7701 \f
7702 /* Second relaxation pass. */
7703
7704 /* Modify all of the relocations to point to the right spot, and if this
7705 is a relaxable section, delete the unwanted literals and fix the
7706 section size. */
7707
7708 bfd_boolean
7709 relax_section (bfd *abfd, asection *sec, struct bfd_link_info *link_info)
7710 {
7711 Elf_Internal_Rela *internal_relocs;
7712 xtensa_relax_info *relax_info;
7713 bfd_byte *contents;
7714 bfd_boolean ok = TRUE;
7715 unsigned i;
7716 bfd_boolean rv = FALSE;
7717 bfd_boolean virtual_action;
7718 bfd_size_type sec_size;
7719
7720 sec_size = bfd_get_section_limit (abfd, sec);
7721 relax_info = get_xtensa_relax_info (sec);
7722 BFD_ASSERT (relax_info);
7723
7724 /* First translate any of the fixes that have been added already. */
7725 translate_section_fixes (sec);
7726
7727 /* Handle property sections (e.g., literal tables) specially. */
7728 if (xtensa_is_property_section (sec))
7729 {
7730 BFD_ASSERT (!relax_info->is_relaxable_literal_section);
7731 return relax_property_section (abfd, sec, link_info);
7732 }
7733
7734 internal_relocs = retrieve_internal_relocs (abfd, sec,
7735 link_info->keep_memory);
7736 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
7737 if (contents == NULL && sec_size != 0)
7738 {
7739 ok = FALSE;
7740 goto error_return;
7741 }
7742
7743 if (internal_relocs)
7744 {
7745 for (i = 0; i < sec->reloc_count; i++)
7746 {
7747 Elf_Internal_Rela *irel;
7748 xtensa_relax_info *target_relax_info;
7749 bfd_vma source_offset, old_source_offset;
7750 r_reloc r_rel;
7751 unsigned r_type;
7752 asection *target_sec;
7753
7754 /* Locally change the source address.
7755 Translate the target to the new target address.
7756 If it points to this section and has been removed,
7757 NULLify it.
7758 Write it back. */
7759
7760 irel = &internal_relocs[i];
7761 source_offset = irel->r_offset;
7762 old_source_offset = source_offset;
7763
7764 r_type = ELF32_R_TYPE (irel->r_info);
7765 r_reloc_init (&r_rel, abfd, irel, contents,
7766 bfd_get_section_limit (abfd, sec));
7767
7768 /* If this section could have changed then we may need to
7769 change the relocation's offset. */
7770
7771 if (relax_info->is_relaxable_literal_section
7772 || relax_info->is_relaxable_asm_section)
7773 {
7774 if (r_type != R_XTENSA_NONE
7775 && find_removed_literal (&relax_info->removed_list,
7776 irel->r_offset))
7777 {
7778 /* Remove this relocation. */
7779 if (elf_hash_table (link_info)->dynamic_sections_created)
7780 shrink_dynamic_reloc_sections (link_info, abfd, sec, irel);
7781 irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
7782 irel->r_offset = offset_with_removed_text
7783 (&relax_info->action_list, irel->r_offset);
7784 pin_internal_relocs (sec, internal_relocs);
7785 continue;
7786 }
7787
7788 if (r_type == R_XTENSA_ASM_SIMPLIFY)
7789 {
7790 text_action *action =
7791 find_insn_action (&relax_info->action_list,
7792 irel->r_offset);
7793 if (action && (action->action == ta_convert_longcall
7794 || action->action == ta_remove_longcall))
7795 {
7796 bfd_reloc_status_type retval;
7797 char *error_message = NULL;
7798
7799 retval = contract_asm_expansion (contents, sec_size,
7800 irel, &error_message);
7801 if (retval != bfd_reloc_ok)
7802 {
7803 (*link_info->callbacks->reloc_dangerous)
7804 (link_info, error_message, abfd, sec,
7805 irel->r_offset);
7806 goto error_return;
7807 }
7808 /* Update the action so that the code that moves
7809 the contents will do the right thing. */
7810 if (action->action == ta_remove_longcall)
7811 action->action = ta_remove_insn;
7812 else
7813 action->action = ta_none;
7814 /* Refresh the info in the r_rel. */
7815 r_reloc_init (&r_rel, abfd, irel, contents, sec_size);
7816 r_type = ELF32_R_TYPE (irel->r_info);
7817 }
7818 }
7819
7820 source_offset = offset_with_removed_text
7821 (&relax_info->action_list, irel->r_offset);
7822 irel->r_offset = source_offset;
7823 }
7824
7825 /* If the target section could have changed then
7826 we may need to change the relocation's target offset. */
7827
7828 target_sec = r_reloc_get_section (&r_rel);
7829 target_relax_info = get_xtensa_relax_info (target_sec);
7830
7831 if (target_relax_info
7832 && (target_relax_info->is_relaxable_literal_section
7833 || target_relax_info->is_relaxable_asm_section))
7834 {
7835 r_reloc new_reloc;
7836 reloc_bfd_fix *fix;
7837 bfd_vma addend_displacement;
7838
7839 translate_reloc (&r_rel, &new_reloc);
7840
7841 if (r_type == R_XTENSA_DIFF8
7842 || r_type == R_XTENSA_DIFF16
7843 || r_type == R_XTENSA_DIFF32)
7844 {
7845 bfd_vma diff_value = 0, new_end_offset, diff_mask = 0;
7846
7847 if (bfd_get_section_limit (abfd, sec) < old_source_offset)
7848 {
7849 (*link_info->callbacks->reloc_dangerous)
7850 (link_info, _("invalid relocation address"),
7851 abfd, sec, old_source_offset);
7852 goto error_return;
7853 }
7854
7855 switch (r_type)
7856 {
7857 case R_XTENSA_DIFF8:
7858 diff_value =
7859 bfd_get_8 (abfd, &contents[old_source_offset]);
7860 break;
7861 case R_XTENSA_DIFF16:
7862 diff_value =
7863 bfd_get_16 (abfd, &contents[old_source_offset]);
7864 break;
7865 case R_XTENSA_DIFF32:
7866 diff_value =
7867 bfd_get_32 (abfd, &contents[old_source_offset]);
7868 break;
7869 }
7870
7871 new_end_offset = offset_with_removed_text
7872 (&target_relax_info->action_list,
7873 r_rel.target_offset + diff_value);
7874 diff_value = new_end_offset - new_reloc.target_offset;
7875
7876 switch (r_type)
7877 {
7878 case R_XTENSA_DIFF8:
7879 diff_mask = 0xff;
7880 bfd_put_8 (abfd, diff_value,
7881 &contents[old_source_offset]);
7882 break;
7883 case R_XTENSA_DIFF16:
7884 diff_mask = 0xffff;
7885 bfd_put_16 (abfd, diff_value,
7886 &contents[old_source_offset]);
7887 break;
7888 case R_XTENSA_DIFF32:
7889 diff_mask = 0xffffffff;
7890 bfd_put_32 (abfd, diff_value,
7891 &contents[old_source_offset]);
7892 break;
7893 }
7894
7895 /* Check for overflow. */
7896 if ((diff_value & ~diff_mask) != 0)
7897 {
7898 (*link_info->callbacks->reloc_dangerous)
7899 (link_info, _("overflow after relaxation"),
7900 abfd, sec, old_source_offset);
7901 goto error_return;
7902 }
7903
7904 pin_contents (sec, contents);
7905 }
7906
7907 /* FIXME: If the relocation still references a section in
7908 the same input file, the relocation should be modified
7909 directly instead of adding a "fix" record. */
7910
7911 addend_displacement =
7912 new_reloc.target_offset + new_reloc.virtual_offset;
7913
7914 fix = reloc_bfd_fix_init (sec, source_offset, r_type, 0,
7915 r_reloc_get_section (&new_reloc),
7916 addend_displacement, TRUE);
7917 add_fix (sec, fix);
7918 }
7919
7920 pin_internal_relocs (sec, internal_relocs);
7921 }
7922 }
7923
7924 if ((relax_info->is_relaxable_literal_section
7925 || relax_info->is_relaxable_asm_section)
7926 && relax_info->action_list.head)
7927 {
7928 /* Walk through the planned actions and build up a table
7929 of move, copy and fill records. Use the move, copy and
7930 fill records to perform the actions once. */
7931
7932 bfd_size_type size = sec->size;
7933 int removed = 0;
7934 bfd_size_type final_size, copy_size, orig_insn_size;
7935 bfd_byte *scratch = NULL;
7936 bfd_byte *dup_contents = NULL;
7937 bfd_size_type orig_size = size;
7938 bfd_vma orig_dot = 0;
7939 bfd_vma orig_dot_copied = 0; /* Byte copied already from
7940 orig dot in physical memory. */
7941 bfd_vma orig_dot_vo = 0; /* Virtual offset from orig_dot. */
7942 bfd_vma dup_dot = 0;
7943
7944 text_action *action = relax_info->action_list.head;
7945
7946 final_size = sec->size;
7947 for (action = relax_info->action_list.head; action;
7948 action = action->next)
7949 {
7950 final_size -= action->removed_bytes;
7951 }
7952
7953 scratch = (bfd_byte *) bfd_zmalloc (final_size);
7954 dup_contents = (bfd_byte *) bfd_zmalloc (final_size);
7955
7956 /* The dot is the current fill location. */
7957 #if DEBUG
7958 print_action_list (stderr, &relax_info->action_list);
7959 #endif
7960
7961 for (action = relax_info->action_list.head; action;
7962 action = action->next)
7963 {
7964 virtual_action = FALSE;
7965 if (action->offset > orig_dot)
7966 {
7967 orig_dot += orig_dot_copied;
7968 orig_dot_copied = 0;
7969 orig_dot_vo = 0;
7970 /* Out of the virtual world. */
7971 }
7972
7973 if (action->offset > orig_dot)
7974 {
7975 copy_size = action->offset - orig_dot;
7976 memmove (&dup_contents[dup_dot], &contents[orig_dot], copy_size);
7977 orig_dot += copy_size;
7978 dup_dot += copy_size;
7979 BFD_ASSERT (action->offset == orig_dot);
7980 }
7981 else if (action->offset < orig_dot)
7982 {
7983 if (action->action == ta_fill
7984 && action->offset - action->removed_bytes == orig_dot)
7985 {
7986 /* This is OK because the fill only effects the dup_dot. */
7987 }
7988 else if (action->action == ta_add_literal)
7989 {
7990 /* TBD. Might need to handle this. */
7991 }
7992 }
7993 if (action->offset == orig_dot)
7994 {
7995 if (action->virtual_offset > orig_dot_vo)
7996 {
7997 if (orig_dot_vo == 0)
7998 {
7999 /* Need to copy virtual_offset bytes. Probably four. */
8000 copy_size = action->virtual_offset - orig_dot_vo;
8001 memmove (&dup_contents[dup_dot],
8002 &contents[orig_dot], copy_size);
8003 orig_dot_copied = copy_size;
8004 dup_dot += copy_size;
8005 }
8006 virtual_action = TRUE;
8007 }
8008 else
8009 BFD_ASSERT (action->virtual_offset <= orig_dot_vo);
8010 }
8011 switch (action->action)
8012 {
8013 case ta_remove_literal:
8014 case ta_remove_insn:
8015 BFD_ASSERT (action->removed_bytes >= 0);
8016 orig_dot += action->removed_bytes;
8017 break;
8018
8019 case ta_narrow_insn:
8020 orig_insn_size = 3;
8021 copy_size = 2;
8022 memmove (scratch, &contents[orig_dot], orig_insn_size);
8023 BFD_ASSERT (action->removed_bytes == 1);
8024 rv = narrow_instruction (scratch, final_size, 0, TRUE);
8025 BFD_ASSERT (rv);
8026 memmove (&dup_contents[dup_dot], scratch, copy_size);
8027 orig_dot += orig_insn_size;
8028 dup_dot += copy_size;
8029 break;
8030
8031 case ta_fill:
8032 if (action->removed_bytes >= 0)
8033 orig_dot += action->removed_bytes;
8034 else
8035 {
8036 /* Already zeroed in dup_contents. Just bump the
8037 counters. */
8038 dup_dot += (-action->removed_bytes);
8039 }
8040 break;
8041
8042 case ta_none:
8043 BFD_ASSERT (action->removed_bytes == 0);
8044 break;
8045
8046 case ta_convert_longcall:
8047 case ta_remove_longcall:
8048 /* These will be removed or converted before we get here. */
8049 BFD_ASSERT (0);
8050 break;
8051
8052 case ta_widen_insn:
8053 orig_insn_size = 2;
8054 copy_size = 3;
8055 memmove (scratch, &contents[orig_dot], orig_insn_size);
8056 BFD_ASSERT (action->removed_bytes == -1);
8057 rv = widen_instruction (scratch, final_size, 0, TRUE);
8058 BFD_ASSERT (rv);
8059 memmove (&dup_contents[dup_dot], scratch, copy_size);
8060 orig_dot += orig_insn_size;
8061 dup_dot += copy_size;
8062 break;
8063
8064 case ta_add_literal:
8065 orig_insn_size = 0;
8066 copy_size = 4;
8067 BFD_ASSERT (action->removed_bytes == -4);
8068 /* TBD -- place the literal value here and insert
8069 into the table. */
8070 memset (&dup_contents[dup_dot], 0, 4);
8071 pin_internal_relocs (sec, internal_relocs);
8072 pin_contents (sec, contents);
8073
8074 if (!move_literal (abfd, link_info, sec, dup_dot, dup_contents,
8075 relax_info, &internal_relocs, &action->value))
8076 goto error_return;
8077
8078 if (virtual_action)
8079 orig_dot_vo += copy_size;
8080
8081 orig_dot += orig_insn_size;
8082 dup_dot += copy_size;
8083 break;
8084
8085 default:
8086 /* Not implemented yet. */
8087 BFD_ASSERT (0);
8088 break;
8089 }
8090
8091 size -= action->removed_bytes;
8092 removed += action->removed_bytes;
8093 BFD_ASSERT (dup_dot <= final_size);
8094 BFD_ASSERT (orig_dot <= orig_size);
8095 }
8096
8097 orig_dot += orig_dot_copied;
8098 orig_dot_copied = 0;
8099
8100 if (orig_dot != orig_size)
8101 {
8102 copy_size = orig_size - orig_dot;
8103 BFD_ASSERT (orig_size > orig_dot);
8104 BFD_ASSERT (dup_dot + copy_size == final_size);
8105 memmove (&dup_contents[dup_dot], &contents[orig_dot], copy_size);
8106 orig_dot += copy_size;
8107 dup_dot += copy_size;
8108 }
8109 BFD_ASSERT (orig_size == orig_dot);
8110 BFD_ASSERT (final_size == dup_dot);
8111
8112 /* Move the dup_contents back. */
8113 if (final_size > orig_size)
8114 {
8115 /* Contents need to be reallocated. Swap the dup_contents into
8116 contents. */
8117 sec->contents = dup_contents;
8118 free (contents);
8119 contents = dup_contents;
8120 pin_contents (sec, contents);
8121 }
8122 else
8123 {
8124 BFD_ASSERT (final_size <= orig_size);
8125 memset (contents, 0, orig_size);
8126 memcpy (contents, dup_contents, final_size);
8127 free (dup_contents);
8128 }
8129 free (scratch);
8130 pin_contents (sec, contents);
8131
8132 sec->size = final_size;
8133 }
8134
8135 error_return:
8136 release_internal_relocs (sec, internal_relocs);
8137 release_contents (sec, contents);
8138 return ok;
8139 }
8140
8141
8142 static bfd_boolean
8143 translate_section_fixes (asection *sec)
8144 {
8145 xtensa_relax_info *relax_info;
8146 reloc_bfd_fix *r;
8147
8148 relax_info = get_xtensa_relax_info (sec);
8149 if (!relax_info)
8150 return TRUE;
8151
8152 for (r = relax_info->fix_list; r != NULL; r = r->next)
8153 if (!translate_reloc_bfd_fix (r))
8154 return FALSE;
8155
8156 return TRUE;
8157 }
8158
8159
8160 /* Translate a fix given the mapping in the relax info for the target
8161 section. If it has already been translated, no work is required. */
8162
8163 static bfd_boolean
8164 translate_reloc_bfd_fix (reloc_bfd_fix *fix)
8165 {
8166 reloc_bfd_fix new_fix;
8167 asection *sec;
8168 xtensa_relax_info *relax_info;
8169 removed_literal *removed;
8170 bfd_vma new_offset, target_offset;
8171
8172 if (fix->translated)
8173 return TRUE;
8174
8175 sec = fix->target_sec;
8176 target_offset = fix->target_offset;
8177
8178 relax_info = get_xtensa_relax_info (sec);
8179 if (!relax_info)
8180 {
8181 fix->translated = TRUE;
8182 return TRUE;
8183 }
8184
8185 new_fix = *fix;
8186
8187 /* The fix does not need to be translated if the section cannot change. */
8188 if (!relax_info->is_relaxable_literal_section
8189 && !relax_info->is_relaxable_asm_section)
8190 {
8191 fix->translated = TRUE;
8192 return TRUE;
8193 }
8194
8195 /* If the literal has been moved and this relocation was on an
8196 opcode, then the relocation should move to the new literal
8197 location. Otherwise, the relocation should move within the
8198 section. */
8199
8200 removed = FALSE;
8201 if (is_operand_relocation (fix->src_type))
8202 {
8203 /* Check if the original relocation is against a literal being
8204 removed. */
8205 removed = find_removed_literal (&relax_info->removed_list,
8206 target_offset);
8207 }
8208
8209 if (removed)
8210 {
8211 asection *new_sec;
8212
8213 /* The fact that there is still a relocation to this literal indicates
8214 that the literal is being coalesced, not simply removed. */
8215 BFD_ASSERT (removed->to.abfd != NULL);
8216
8217 /* This was moved to some other address (possibly another section). */
8218 new_sec = r_reloc_get_section (&removed->to);
8219 if (new_sec != sec)
8220 {
8221 sec = new_sec;
8222 relax_info = get_xtensa_relax_info (sec);
8223 if (!relax_info ||
8224 (!relax_info->is_relaxable_literal_section
8225 && !relax_info->is_relaxable_asm_section))
8226 {
8227 target_offset = removed->to.target_offset;
8228 new_fix.target_sec = new_sec;
8229 new_fix.target_offset = target_offset;
8230 new_fix.translated = TRUE;
8231 *fix = new_fix;
8232 return TRUE;
8233 }
8234 }
8235 target_offset = removed->to.target_offset;
8236 new_fix.target_sec = new_sec;
8237 }
8238
8239 /* The target address may have been moved within its section. */
8240 new_offset = offset_with_removed_text (&relax_info->action_list,
8241 target_offset);
8242
8243 new_fix.target_offset = new_offset;
8244 new_fix.target_offset = new_offset;
8245 new_fix.translated = TRUE;
8246 *fix = new_fix;
8247 return TRUE;
8248 }
8249
8250
8251 /* Fix up a relocation to take account of removed literals. */
8252
8253 static void
8254 translate_reloc (const r_reloc *orig_rel, r_reloc *new_rel)
8255 {
8256 asection *sec;
8257 xtensa_relax_info *relax_info;
8258 removed_literal *removed;
8259 bfd_vma new_offset, target_offset, removed_bytes;
8260
8261 *new_rel = *orig_rel;
8262
8263 if (!r_reloc_is_defined (orig_rel))
8264 return;
8265 sec = r_reloc_get_section (orig_rel);
8266
8267 relax_info = get_xtensa_relax_info (sec);
8268 BFD_ASSERT (relax_info);
8269
8270 if (!relax_info->is_relaxable_literal_section
8271 && !relax_info->is_relaxable_asm_section)
8272 return;
8273
8274 target_offset = orig_rel->target_offset;
8275
8276 removed = FALSE;
8277 if (is_operand_relocation (ELF32_R_TYPE (orig_rel->rela.r_info)))
8278 {
8279 /* Check if the original relocation is against a literal being
8280 removed. */
8281 removed = find_removed_literal (&relax_info->removed_list,
8282 target_offset);
8283 }
8284 if (removed && removed->to.abfd)
8285 {
8286 asection *new_sec;
8287
8288 /* The fact that there is still a relocation to this literal indicates
8289 that the literal is being coalesced, not simply removed. */
8290 BFD_ASSERT (removed->to.abfd != NULL);
8291
8292 /* This was moved to some other address
8293 (possibly in another section). */
8294 *new_rel = removed->to;
8295 new_sec = r_reloc_get_section (new_rel);
8296 if (new_sec != sec)
8297 {
8298 sec = new_sec;
8299 relax_info = get_xtensa_relax_info (sec);
8300 if (!relax_info
8301 || (!relax_info->is_relaxable_literal_section
8302 && !relax_info->is_relaxable_asm_section))
8303 return;
8304 }
8305 target_offset = new_rel->target_offset;
8306 }
8307
8308 /* ...and the target address may have been moved within its section. */
8309 new_offset = offset_with_removed_text (&relax_info->action_list,
8310 target_offset);
8311
8312 /* Modify the offset and addend. */
8313 removed_bytes = target_offset - new_offset;
8314 new_rel->target_offset = new_offset;
8315 new_rel->rela.r_addend -= removed_bytes;
8316 }
8317
8318
8319 /* For dynamic links, there may be a dynamic relocation for each
8320 literal. The number of dynamic relocations must be computed in
8321 size_dynamic_sections, which occurs before relaxation. When a
8322 literal is removed, this function checks if there is a corresponding
8323 dynamic relocation and shrinks the size of the appropriate dynamic
8324 relocation section accordingly. At this point, the contents of the
8325 dynamic relocation sections have not yet been filled in, so there's
8326 nothing else that needs to be done. */
8327
8328 static void
8329 shrink_dynamic_reloc_sections (struct bfd_link_info *info,
8330 bfd *abfd,
8331 asection *input_section,
8332 Elf_Internal_Rela *rel)
8333 {
8334 Elf_Internal_Shdr *symtab_hdr;
8335 struct elf_link_hash_entry **sym_hashes;
8336 unsigned long r_symndx;
8337 int r_type;
8338 struct elf_link_hash_entry *h;
8339 bfd_boolean dynamic_symbol;
8340
8341 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
8342 sym_hashes = elf_sym_hashes (abfd);
8343
8344 r_type = ELF32_R_TYPE (rel->r_info);
8345 r_symndx = ELF32_R_SYM (rel->r_info);
8346
8347 if (r_symndx < symtab_hdr->sh_info)
8348 h = NULL;
8349 else
8350 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
8351
8352 dynamic_symbol = xtensa_elf_dynamic_symbol_p (h, info);
8353
8354 if ((r_type == R_XTENSA_32 || r_type == R_XTENSA_PLT)
8355 && (input_section->flags & SEC_ALLOC) != 0
8356 && (dynamic_symbol || info->shared))
8357 {
8358 bfd *dynobj;
8359 const char *srel_name;
8360 asection *srel;
8361 bfd_boolean is_plt = FALSE;
8362
8363 dynobj = elf_hash_table (info)->dynobj;
8364 BFD_ASSERT (dynobj != NULL);
8365
8366 if (dynamic_symbol && r_type == R_XTENSA_PLT)
8367 {
8368 srel_name = ".rela.plt";
8369 is_plt = TRUE;
8370 }
8371 else
8372 srel_name = ".rela.got";
8373
8374 /* Reduce size of the .rela.* section by one reloc. */
8375 srel = bfd_get_section_by_name (dynobj, srel_name);
8376 BFD_ASSERT (srel != NULL);
8377 BFD_ASSERT (srel->size >= sizeof (Elf32_External_Rela));
8378 srel->size -= sizeof (Elf32_External_Rela);
8379
8380 if (is_plt)
8381 {
8382 asection *splt, *sgotplt, *srelgot;
8383 int reloc_index, chunk;
8384
8385 /* Find the PLT reloc index of the entry being removed. This
8386 is computed from the size of ".rela.plt". It is needed to
8387 figure out which PLT chunk to resize. Usually "last index
8388 = size - 1" since the index starts at zero, but in this
8389 context, the size has just been decremented so there's no
8390 need to subtract one. */
8391 reloc_index = srel->size / sizeof (Elf32_External_Rela);
8392
8393 chunk = reloc_index / PLT_ENTRIES_PER_CHUNK;
8394 splt = elf_xtensa_get_plt_section (dynobj, chunk);
8395 sgotplt = elf_xtensa_get_gotplt_section (dynobj, chunk);
8396 BFD_ASSERT (splt != NULL && sgotplt != NULL);
8397
8398 /* Check if an entire PLT chunk has just been eliminated. */
8399 if (reloc_index % PLT_ENTRIES_PER_CHUNK == 0)
8400 {
8401 /* The two magic GOT entries for that chunk can go away. */
8402 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
8403 BFD_ASSERT (srelgot != NULL);
8404 srelgot->reloc_count -= 2;
8405 srelgot->size -= 2 * sizeof (Elf32_External_Rela);
8406 sgotplt->size -= 8;
8407
8408 /* There should be only one entry left (and it will be
8409 removed below). */
8410 BFD_ASSERT (sgotplt->size == 4);
8411 BFD_ASSERT (splt->size == PLT_ENTRY_SIZE);
8412 }
8413
8414 BFD_ASSERT (sgotplt->size >= 4);
8415 BFD_ASSERT (splt->size >= PLT_ENTRY_SIZE);
8416
8417 sgotplt->size -= 4;
8418 splt->size -= PLT_ENTRY_SIZE;
8419 }
8420 }
8421 }
8422
8423
8424 /* Take an r_rel and move it to another section. This usually
8425 requires extending the interal_relocation array and pinning it. If
8426 the original r_rel is from the same BFD, we can complete this here.
8427 Otherwise, we add a fix record to let the final link fix the
8428 appropriate address. Contents and internal relocations for the
8429 section must be pinned after calling this routine. */
8430
8431 static bfd_boolean
8432 move_literal (bfd *abfd,
8433 struct bfd_link_info *link_info,
8434 asection *sec,
8435 bfd_vma offset,
8436 bfd_byte *contents,
8437 xtensa_relax_info *relax_info,
8438 Elf_Internal_Rela **internal_relocs_p,
8439 const literal_value *lit)
8440 {
8441 Elf_Internal_Rela *new_relocs = NULL;
8442 size_t new_relocs_count = 0;
8443 Elf_Internal_Rela this_rela;
8444 const r_reloc *r_rel;
8445
8446 r_rel = &lit->r_rel;
8447 BFD_ASSERT (elf_section_data (sec)->relocs == *internal_relocs_p);
8448
8449 if (r_reloc_is_const (r_rel))
8450 bfd_put_32 (abfd, lit->value, contents + offset);
8451 else
8452 {
8453 int r_type;
8454 unsigned i;
8455 asection *target_sec;
8456 reloc_bfd_fix *fix;
8457 unsigned insert_at;
8458
8459 r_type = ELF32_R_TYPE (r_rel->rela.r_info);
8460 target_sec = r_reloc_get_section (r_rel);
8461
8462 /* This is the difficult case. We have to create a fix up. */
8463 this_rela.r_offset = offset;
8464 this_rela.r_info = ELF32_R_INFO (0, r_type);
8465 this_rela.r_addend =
8466 r_rel->target_offset - r_reloc_get_target_offset (r_rel);
8467 bfd_put_32 (abfd, lit->value, contents + offset);
8468
8469 /* Currently, we cannot move relocations during a relocatable link. */
8470 BFD_ASSERT (!link_info->relocatable);
8471 fix = reloc_bfd_fix_init (sec, offset, r_type, r_rel->abfd,
8472 r_reloc_get_section (r_rel),
8473 r_rel->target_offset + r_rel->virtual_offset,
8474 FALSE);
8475 /* We also need to mark that relocations are needed here. */
8476 sec->flags |= SEC_RELOC;
8477
8478 translate_reloc_bfd_fix (fix);
8479 /* This fix has not yet been translated. */
8480 add_fix (sec, fix);
8481
8482 /* Add the relocation. If we have already allocated our own
8483 space for the relocations and we have room for more, then use
8484 it. Otherwise, allocate new space and move the literals. */
8485 insert_at = sec->reloc_count;
8486 for (i = 0; i < sec->reloc_count; ++i)
8487 {
8488 if (this_rela.r_offset < (*internal_relocs_p)[i].r_offset)
8489 {
8490 insert_at = i;
8491 break;
8492 }
8493 }
8494
8495 if (*internal_relocs_p != relax_info->allocated_relocs
8496 || sec->reloc_count + 1 > relax_info->allocated_relocs_count)
8497 {
8498 BFD_ASSERT (relax_info->allocated_relocs == NULL
8499 || sec->reloc_count == relax_info->relocs_count);
8500
8501 if (relax_info->allocated_relocs_count == 0)
8502 new_relocs_count = (sec->reloc_count + 2) * 2;
8503 else
8504 new_relocs_count = (relax_info->allocated_relocs_count + 2) * 2;
8505
8506 new_relocs = (Elf_Internal_Rela *)
8507 bfd_zmalloc (sizeof (Elf_Internal_Rela) * (new_relocs_count));
8508 if (!new_relocs)
8509 return FALSE;
8510
8511 /* We could handle this more quickly by finding the split point. */
8512 if (insert_at != 0)
8513 memcpy (new_relocs, *internal_relocs_p,
8514 insert_at * sizeof (Elf_Internal_Rela));
8515
8516 new_relocs[insert_at] = this_rela;
8517
8518 if (insert_at != sec->reloc_count)
8519 memcpy (new_relocs + insert_at + 1,
8520 (*internal_relocs_p) + insert_at,
8521 (sec->reloc_count - insert_at)
8522 * sizeof (Elf_Internal_Rela));
8523
8524 if (*internal_relocs_p != relax_info->allocated_relocs)
8525 {
8526 /* The first time we re-allocate, we can only free the
8527 old relocs if they were allocated with bfd_malloc.
8528 This is not true when keep_memory is in effect. */
8529 if (!link_info->keep_memory)
8530 free (*internal_relocs_p);
8531 }
8532 else
8533 free (*internal_relocs_p);
8534 relax_info->allocated_relocs = new_relocs;
8535 relax_info->allocated_relocs_count = new_relocs_count;
8536 elf_section_data (sec)->relocs = new_relocs;
8537 sec->reloc_count++;
8538 relax_info->relocs_count = sec->reloc_count;
8539 *internal_relocs_p = new_relocs;
8540 }
8541 else
8542 {
8543 if (insert_at != sec->reloc_count)
8544 {
8545 unsigned idx;
8546 for (idx = sec->reloc_count; idx > insert_at; idx--)
8547 (*internal_relocs_p)[idx] = (*internal_relocs_p)[idx-1];
8548 }
8549 (*internal_relocs_p)[insert_at] = this_rela;
8550 sec->reloc_count++;
8551 if (relax_info->allocated_relocs)
8552 relax_info->relocs_count = sec->reloc_count;
8553 }
8554 }
8555 return TRUE;
8556 }
8557
8558
8559 /* This is similar to relax_section except that when a target is moved,
8560 we shift addresses up. We also need to modify the size. This
8561 algorithm does NOT allow for relocations into the middle of the
8562 property sections. */
8563
8564 static bfd_boolean
8565 relax_property_section (bfd *abfd,
8566 asection *sec,
8567 struct bfd_link_info *link_info)
8568 {
8569 Elf_Internal_Rela *internal_relocs;
8570 bfd_byte *contents;
8571 unsigned i, nexti;
8572 bfd_boolean ok = TRUE;
8573 bfd_boolean is_full_prop_section;
8574 size_t last_zfill_target_offset = 0;
8575 asection *last_zfill_target_sec = NULL;
8576 bfd_size_type sec_size;
8577
8578 sec_size = bfd_get_section_limit (abfd, sec);
8579 internal_relocs = retrieve_internal_relocs (abfd, sec,
8580 link_info->keep_memory);
8581 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
8582 if (contents == NULL && sec_size != 0)
8583 {
8584 ok = FALSE;
8585 goto error_return;
8586 }
8587
8588 is_full_prop_section =
8589 ((strcmp (sec->name, XTENSA_PROP_SEC_NAME) == 0)
8590 || (strncmp (sec->name, ".gnu.linkonce.prop.",
8591 sizeof ".gnu.linkonce.prop." - 1) == 0));
8592
8593 if (internal_relocs)
8594 {
8595 for (i = 0; i < sec->reloc_count; i++)
8596 {
8597 Elf_Internal_Rela *irel;
8598 xtensa_relax_info *target_relax_info;
8599 unsigned r_type;
8600 asection *target_sec;
8601 literal_value val;
8602 bfd_byte *size_p, *flags_p;
8603
8604 /* Locally change the source address.
8605 Translate the target to the new target address.
8606 If it points to this section and has been removed, MOVE IT.
8607 Also, don't forget to modify the associated SIZE at
8608 (offset + 4). */
8609
8610 irel = &internal_relocs[i];
8611 r_type = ELF32_R_TYPE (irel->r_info);
8612 if (r_type == R_XTENSA_NONE)
8613 continue;
8614
8615 /* Find the literal value. */
8616 r_reloc_init (&val.r_rel, abfd, irel, contents, sec_size);
8617 size_p = &contents[irel->r_offset + 4];
8618 flags_p = NULL;
8619 if (is_full_prop_section)
8620 {
8621 flags_p = &contents[irel->r_offset + 8];
8622 BFD_ASSERT (irel->r_offset + 12 <= sec_size);
8623 }
8624 else
8625 BFD_ASSERT (irel->r_offset + 8 <= sec_size);
8626
8627 target_sec = r_reloc_get_section (&val.r_rel);
8628 target_relax_info = get_xtensa_relax_info (target_sec);
8629
8630 if (target_relax_info
8631 && (target_relax_info->is_relaxable_literal_section
8632 || target_relax_info->is_relaxable_asm_section ))
8633 {
8634 /* Translate the relocation's destination. */
8635 bfd_vma new_offset, new_end_offset;
8636 long old_size, new_size;
8637
8638 new_offset = offset_with_removed_text
8639 (&target_relax_info->action_list, val.r_rel.target_offset);
8640
8641 /* Assert that we are not out of bounds. */
8642 old_size = bfd_get_32 (abfd, size_p);
8643
8644 if (old_size == 0)
8645 {
8646 /* Only the first zero-sized unreachable entry is
8647 allowed to expand. In this case the new offset
8648 should be the offset before the fill and the new
8649 size is the expansion size. For other zero-sized
8650 entries the resulting size should be zero with an
8651 offset before or after the fill address depending
8652 on whether the expanding unreachable entry
8653 preceeds it. */
8654 if (last_zfill_target_sec
8655 && last_zfill_target_sec == target_sec
8656 && last_zfill_target_offset == val.r_rel.target_offset)
8657 new_end_offset = new_offset;
8658 else
8659 {
8660 new_end_offset = new_offset;
8661 new_offset = offset_with_removed_text_before_fill
8662 (&target_relax_info->action_list,
8663 val.r_rel.target_offset);
8664
8665 /* If it is not unreachable and we have not yet
8666 seen an unreachable at this address, place it
8667 before the fill address. */
8668 if (!flags_p
8669 || (bfd_get_32 (abfd, flags_p)
8670 & XTENSA_PROP_UNREACHABLE) == 0)
8671 new_end_offset = new_offset;
8672 else
8673 {
8674 last_zfill_target_sec = target_sec;
8675 last_zfill_target_offset = val.r_rel.target_offset;
8676 }
8677 }
8678 }
8679 else
8680 {
8681 new_end_offset = offset_with_removed_text_before_fill
8682 (&target_relax_info->action_list,
8683 val.r_rel.target_offset + old_size);
8684 }
8685
8686 new_size = new_end_offset - new_offset;
8687
8688 if (new_size != old_size)
8689 {
8690 bfd_put_32 (abfd, new_size, size_p);
8691 pin_contents (sec, contents);
8692 }
8693
8694 if (new_offset != val.r_rel.target_offset)
8695 {
8696 bfd_vma diff = new_offset - val.r_rel.target_offset;
8697 irel->r_addend += diff;
8698 pin_internal_relocs (sec, internal_relocs);
8699 }
8700 }
8701 }
8702 }
8703
8704 /* Combine adjacent property table entries. This is also done in
8705 finish_dynamic_sections() but at that point it's too late to
8706 reclaim the space in the output section, so we do this twice. */
8707
8708 if (internal_relocs && (!link_info->relocatable
8709 || strcmp (sec->name, XTENSA_LIT_SEC_NAME) == 0))
8710 {
8711 Elf_Internal_Rela *last_irel = NULL;
8712 int removed_bytes = 0;
8713 bfd_vma offset, last_irel_offset;
8714 bfd_vma section_size;
8715 bfd_size_type entry_size;
8716 flagword predef_flags;
8717
8718 if (is_full_prop_section)
8719 entry_size = 12;
8720 else
8721 entry_size = 8;
8722
8723 predef_flags = xtensa_get_property_predef_flags (sec);
8724
8725 /* Walk over memory and irels at the same time.
8726 This REQUIRES that the internal_relocs be sorted by offset. */
8727 qsort (internal_relocs, sec->reloc_count, sizeof (Elf_Internal_Rela),
8728 internal_reloc_compare);
8729 nexti = 0; /* Index into internal_relocs. */
8730
8731 pin_internal_relocs (sec, internal_relocs);
8732 pin_contents (sec, contents);
8733
8734 last_irel_offset = (bfd_vma) -1;
8735 section_size = sec->size;
8736 BFD_ASSERT (section_size % entry_size == 0);
8737
8738 for (offset = 0; offset < section_size; offset += entry_size)
8739 {
8740 Elf_Internal_Rela *irel, *next_irel;
8741 bfd_vma bytes_to_remove, size, actual_offset;
8742 bfd_boolean remove_this_irel;
8743 flagword flags;
8744
8745 irel = NULL;
8746 next_irel = NULL;
8747
8748 /* Find the next two relocations (if there are that many left),
8749 skipping over any R_XTENSA_NONE relocs. On entry, "nexti" is
8750 the starting reloc index. After these two loops, "i"
8751 is the index of the first non-NONE reloc past that starting
8752 index, and "nexti" is the index for the next non-NONE reloc
8753 after "i". */
8754
8755 for (i = nexti; i < sec->reloc_count; i++)
8756 {
8757 if (ELF32_R_TYPE (internal_relocs[i].r_info) != R_XTENSA_NONE)
8758 {
8759 irel = &internal_relocs[i];
8760 break;
8761 }
8762 internal_relocs[i].r_offset -= removed_bytes;
8763 }
8764
8765 for (nexti = i + 1; nexti < sec->reloc_count; nexti++)
8766 {
8767 if (ELF32_R_TYPE (internal_relocs[nexti].r_info)
8768 != R_XTENSA_NONE)
8769 {
8770 next_irel = &internal_relocs[nexti];
8771 break;
8772 }
8773 internal_relocs[nexti].r_offset -= removed_bytes;
8774 }
8775
8776 remove_this_irel = FALSE;
8777 bytes_to_remove = 0;
8778 actual_offset = offset - removed_bytes;
8779 size = bfd_get_32 (abfd, &contents[actual_offset + 4]);
8780
8781 if (is_full_prop_section)
8782 flags = bfd_get_32 (abfd, &contents[actual_offset + 8]);
8783 else
8784 flags = predef_flags;
8785
8786 /* Check that the irels are sorted by offset,
8787 with only one per address. */
8788 BFD_ASSERT (!irel || (int) irel->r_offset > (int) last_irel_offset);
8789 BFD_ASSERT (!next_irel || next_irel->r_offset > irel->r_offset);
8790
8791 /* Make sure there aren't relocs on the size or flag fields. */
8792 if ((irel && irel->r_offset == offset + 4)
8793 || (is_full_prop_section
8794 && irel && irel->r_offset == offset + 8))
8795 {
8796 irel->r_offset -= removed_bytes;
8797 last_irel_offset = irel->r_offset;
8798 }
8799 else if (next_irel && (next_irel->r_offset == offset + 4
8800 || (is_full_prop_section
8801 && next_irel->r_offset == offset + 8)))
8802 {
8803 nexti += 1;
8804 irel->r_offset -= removed_bytes;
8805 next_irel->r_offset -= removed_bytes;
8806 last_irel_offset = next_irel->r_offset;
8807 }
8808 else if (size == 0 && (flags & XTENSA_PROP_ALIGN) == 0
8809 && (flags & XTENSA_PROP_UNREACHABLE) == 0)
8810 {
8811 /* Always remove entries with zero size and no alignment. */
8812 bytes_to_remove = entry_size;
8813 if (irel && irel->r_offset == offset)
8814 {
8815 remove_this_irel = TRUE;
8816
8817 irel->r_offset -= removed_bytes;
8818 last_irel_offset = irel->r_offset;
8819 }
8820 }
8821 else if (irel && irel->r_offset == offset)
8822 {
8823 if (ELF32_R_TYPE (irel->r_info) == R_XTENSA_32)
8824 {
8825 if (last_irel)
8826 {
8827 flagword old_flags;
8828 bfd_vma old_size =
8829 bfd_get_32 (abfd, &contents[last_irel->r_offset + 4]);
8830 bfd_vma old_address =
8831 (last_irel->r_addend
8832 + bfd_get_32 (abfd, &contents[last_irel->r_offset]));
8833 bfd_vma new_address =
8834 (irel->r_addend
8835 + bfd_get_32 (abfd, &contents[actual_offset]));
8836 if (is_full_prop_section)
8837 old_flags = bfd_get_32
8838 (abfd, &contents[last_irel->r_offset + 8]);
8839 else
8840 old_flags = predef_flags;
8841
8842 if ((ELF32_R_SYM (irel->r_info)
8843 == ELF32_R_SYM (last_irel->r_info))
8844 && old_address + old_size == new_address
8845 && old_flags == flags
8846 && (old_flags & XTENSA_PROP_INSN_BRANCH_TARGET) == 0
8847 && (old_flags & XTENSA_PROP_INSN_LOOP_TARGET) == 0)
8848 {
8849 /* Fix the old size. */
8850 bfd_put_32 (abfd, old_size + size,
8851 &contents[last_irel->r_offset + 4]);
8852 bytes_to_remove = entry_size;
8853 remove_this_irel = TRUE;
8854 }
8855 else
8856 last_irel = irel;
8857 }
8858 else
8859 last_irel = irel;
8860 }
8861
8862 irel->r_offset -= removed_bytes;
8863 last_irel_offset = irel->r_offset;
8864 }
8865
8866 if (remove_this_irel)
8867 {
8868 irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
8869 irel->r_offset -= bytes_to_remove;
8870 }
8871
8872 if (bytes_to_remove != 0)
8873 {
8874 removed_bytes += bytes_to_remove;
8875 if (offset + bytes_to_remove < section_size)
8876 memmove (&contents[actual_offset],
8877 &contents[actual_offset + bytes_to_remove],
8878 section_size - offset - bytes_to_remove);
8879 }
8880 }
8881
8882 if (removed_bytes)
8883 {
8884 /* Clear the removed bytes. */
8885 memset (&contents[section_size - removed_bytes], 0, removed_bytes);
8886
8887 sec->size = section_size - removed_bytes;
8888
8889 if (xtensa_is_littable_section (sec))
8890 {
8891 bfd *dynobj = elf_hash_table (link_info)->dynobj;
8892 if (dynobj)
8893 {
8894 asection *sgotloc =
8895 bfd_get_section_by_name (dynobj, ".got.loc");
8896 if (sgotloc)
8897 sgotloc->size -= removed_bytes;
8898 }
8899 }
8900 }
8901 }
8902
8903 error_return:
8904 release_internal_relocs (sec, internal_relocs);
8905 release_contents (sec, contents);
8906 return ok;
8907 }
8908
8909 \f
8910 /* Third relaxation pass. */
8911
8912 /* Change symbol values to account for removed literals. */
8913
8914 bfd_boolean
8915 relax_section_symbols (bfd *abfd, asection *sec)
8916 {
8917 xtensa_relax_info *relax_info;
8918 unsigned int sec_shndx;
8919 Elf_Internal_Shdr *symtab_hdr;
8920 Elf_Internal_Sym *isymbuf;
8921 unsigned i, num_syms, num_locals;
8922
8923 relax_info = get_xtensa_relax_info (sec);
8924 BFD_ASSERT (relax_info);
8925
8926 if (!relax_info->is_relaxable_literal_section
8927 && !relax_info->is_relaxable_asm_section)
8928 return TRUE;
8929
8930 sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
8931
8932 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
8933 isymbuf = retrieve_local_syms (abfd);
8934
8935 num_syms = symtab_hdr->sh_size / sizeof (Elf32_External_Sym);
8936 num_locals = symtab_hdr->sh_info;
8937
8938 /* Adjust the local symbols defined in this section. */
8939 for (i = 0; i < num_locals; i++)
8940 {
8941 Elf_Internal_Sym *isym = &isymbuf[i];
8942
8943 if (isym->st_shndx == sec_shndx)
8944 {
8945 bfd_vma new_address = offset_with_removed_text
8946 (&relax_info->action_list, isym->st_value);
8947 bfd_vma new_size = isym->st_size;
8948
8949 if (ELF32_ST_TYPE (isym->st_info) == STT_FUNC)
8950 {
8951 bfd_vma new_end = offset_with_removed_text
8952 (&relax_info->action_list, isym->st_value + isym->st_size);
8953 new_size = new_end - new_address;
8954 }
8955
8956 isym->st_value = new_address;
8957 isym->st_size = new_size;
8958 }
8959 }
8960
8961 /* Now adjust the global symbols defined in this section. */
8962 for (i = 0; i < (num_syms - num_locals); i++)
8963 {
8964 struct elf_link_hash_entry *sym_hash;
8965
8966 sym_hash = elf_sym_hashes (abfd)[i];
8967
8968 if (sym_hash->root.type == bfd_link_hash_warning)
8969 sym_hash = (struct elf_link_hash_entry *) sym_hash->root.u.i.link;
8970
8971 if ((sym_hash->root.type == bfd_link_hash_defined
8972 || sym_hash->root.type == bfd_link_hash_defweak)
8973 && sym_hash->root.u.def.section == sec)
8974 {
8975 bfd_vma new_address = offset_with_removed_text
8976 (&relax_info->action_list, sym_hash->root.u.def.value);
8977 bfd_vma new_size = sym_hash->size;
8978
8979 if (sym_hash->type == STT_FUNC)
8980 {
8981 bfd_vma new_end = offset_with_removed_text
8982 (&relax_info->action_list,
8983 sym_hash->root.u.def.value + sym_hash->size);
8984 new_size = new_end - new_address;
8985 }
8986
8987 sym_hash->root.u.def.value = new_address;
8988 sym_hash->size = new_size;
8989 }
8990 }
8991
8992 return TRUE;
8993 }
8994
8995 \f
8996 /* "Fix" handling functions, called while performing relocations. */
8997
8998 static bfd_boolean
8999 do_fix_for_relocatable_link (Elf_Internal_Rela *rel,
9000 bfd *input_bfd,
9001 asection *input_section,
9002 bfd_byte *contents)
9003 {
9004 r_reloc r_rel;
9005 asection *sec, *old_sec;
9006 bfd_vma old_offset;
9007 int r_type = ELF32_R_TYPE (rel->r_info);
9008 reloc_bfd_fix *fix;
9009
9010 if (r_type == R_XTENSA_NONE)
9011 return TRUE;
9012
9013 fix = get_bfd_fix (input_section, rel->r_offset, r_type);
9014 if (!fix)
9015 return TRUE;
9016
9017 r_reloc_init (&r_rel, input_bfd, rel, contents,
9018 bfd_get_section_limit (input_bfd, input_section));
9019 old_sec = r_reloc_get_section (&r_rel);
9020 old_offset = r_rel.target_offset;
9021
9022 if (!old_sec || !r_reloc_is_defined (&r_rel))
9023 {
9024 if (r_type != R_XTENSA_ASM_EXPAND)
9025 {
9026 (*_bfd_error_handler)
9027 (_("%B(%A+0x%lx): unexpected fix for %s relocation"),
9028 input_bfd, input_section, rel->r_offset,
9029 elf_howto_table[r_type].name);
9030 return FALSE;
9031 }
9032 /* Leave it be. Resolution will happen in a later stage. */
9033 }
9034 else
9035 {
9036 sec = fix->target_sec;
9037 rel->r_addend += ((sec->output_offset + fix->target_offset)
9038 - (old_sec->output_offset + old_offset));
9039 }
9040 return TRUE;
9041 }
9042
9043
9044 static void
9045 do_fix_for_final_link (Elf_Internal_Rela *rel,
9046 bfd *input_bfd,
9047 asection *input_section,
9048 bfd_byte *contents,
9049 bfd_vma *relocationp)
9050 {
9051 asection *sec;
9052 int r_type = ELF32_R_TYPE (rel->r_info);
9053 reloc_bfd_fix *fix;
9054 bfd_vma fixup_diff;
9055
9056 if (r_type == R_XTENSA_NONE)
9057 return;
9058
9059 fix = get_bfd_fix (input_section, rel->r_offset, r_type);
9060 if (!fix)
9061 return;
9062
9063 sec = fix->target_sec;
9064
9065 fixup_diff = rel->r_addend;
9066 if (elf_howto_table[fix->src_type].partial_inplace)
9067 {
9068 bfd_vma inplace_val;
9069 BFD_ASSERT (fix->src_offset
9070 < bfd_get_section_limit (input_bfd, input_section));
9071 inplace_val = bfd_get_32 (input_bfd, &contents[fix->src_offset]);
9072 fixup_diff += inplace_val;
9073 }
9074
9075 *relocationp = (sec->output_section->vma
9076 + sec->output_offset
9077 + fix->target_offset - fixup_diff);
9078 }
9079
9080 \f
9081 /* Miscellaneous utility functions.... */
9082
9083 static asection *
9084 elf_xtensa_get_plt_section (bfd *dynobj, int chunk)
9085 {
9086 char plt_name[10];
9087
9088 if (chunk == 0)
9089 return bfd_get_section_by_name (dynobj, ".plt");
9090
9091 sprintf (plt_name, ".plt.%u", chunk);
9092 return bfd_get_section_by_name (dynobj, plt_name);
9093 }
9094
9095
9096 static asection *
9097 elf_xtensa_get_gotplt_section (bfd *dynobj, int chunk)
9098 {
9099 char got_name[14];
9100
9101 if (chunk == 0)
9102 return bfd_get_section_by_name (dynobj, ".got.plt");
9103
9104 sprintf (got_name, ".got.plt.%u", chunk);
9105 return bfd_get_section_by_name (dynobj, got_name);
9106 }
9107
9108
9109 /* Get the input section for a given symbol index.
9110 If the symbol is:
9111 . a section symbol, return the section;
9112 . a common symbol, return the common section;
9113 . an undefined symbol, return the undefined section;
9114 . an indirect symbol, follow the links;
9115 . an absolute value, return the absolute section. */
9116
9117 static asection *
9118 get_elf_r_symndx_section (bfd *abfd, unsigned long r_symndx)
9119 {
9120 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
9121 asection *target_sec = NULL;
9122 if (r_symndx < symtab_hdr->sh_info)
9123 {
9124 Elf_Internal_Sym *isymbuf;
9125 unsigned int section_index;
9126
9127 isymbuf = retrieve_local_syms (abfd);
9128 section_index = isymbuf[r_symndx].st_shndx;
9129
9130 if (section_index == SHN_UNDEF)
9131 target_sec = bfd_und_section_ptr;
9132 else if (section_index > 0 && section_index < SHN_LORESERVE)
9133 target_sec = bfd_section_from_elf_index (abfd, section_index);
9134 else if (section_index == SHN_ABS)
9135 target_sec = bfd_abs_section_ptr;
9136 else if (section_index == SHN_COMMON)
9137 target_sec = bfd_com_section_ptr;
9138 else
9139 /* Who knows? */
9140 target_sec = NULL;
9141 }
9142 else
9143 {
9144 unsigned long indx = r_symndx - symtab_hdr->sh_info;
9145 struct elf_link_hash_entry *h = elf_sym_hashes (abfd)[indx];
9146
9147 while (h->root.type == bfd_link_hash_indirect
9148 || h->root.type == bfd_link_hash_warning)
9149 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9150
9151 switch (h->root.type)
9152 {
9153 case bfd_link_hash_defined:
9154 case bfd_link_hash_defweak:
9155 target_sec = h->root.u.def.section;
9156 break;
9157 case bfd_link_hash_common:
9158 target_sec = bfd_com_section_ptr;
9159 break;
9160 case bfd_link_hash_undefined:
9161 case bfd_link_hash_undefweak:
9162 target_sec = bfd_und_section_ptr;
9163 break;
9164 default: /* New indirect warning. */
9165 target_sec = bfd_und_section_ptr;
9166 break;
9167 }
9168 }
9169 return target_sec;
9170 }
9171
9172
9173 static struct elf_link_hash_entry *
9174 get_elf_r_symndx_hash_entry (bfd *abfd, unsigned long r_symndx)
9175 {
9176 unsigned long indx;
9177 struct elf_link_hash_entry *h;
9178 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
9179
9180 if (r_symndx < symtab_hdr->sh_info)
9181 return NULL;
9182
9183 indx = r_symndx - symtab_hdr->sh_info;
9184 h = elf_sym_hashes (abfd)[indx];
9185 while (h->root.type == bfd_link_hash_indirect
9186 || h->root.type == bfd_link_hash_warning)
9187 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9188 return h;
9189 }
9190
9191
9192 /* Get the section-relative offset for a symbol number. */
9193
9194 static bfd_vma
9195 get_elf_r_symndx_offset (bfd *abfd, unsigned long r_symndx)
9196 {
9197 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
9198 bfd_vma offset = 0;
9199
9200 if (r_symndx < symtab_hdr->sh_info)
9201 {
9202 Elf_Internal_Sym *isymbuf;
9203 isymbuf = retrieve_local_syms (abfd);
9204 offset = isymbuf[r_symndx].st_value;
9205 }
9206 else
9207 {
9208 unsigned long indx = r_symndx - symtab_hdr->sh_info;
9209 struct elf_link_hash_entry *h =
9210 elf_sym_hashes (abfd)[indx];
9211
9212 while (h->root.type == bfd_link_hash_indirect
9213 || h->root.type == bfd_link_hash_warning)
9214 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9215 if (h->root.type == bfd_link_hash_defined
9216 || h->root.type == bfd_link_hash_defweak)
9217 offset = h->root.u.def.value;
9218 }
9219 return offset;
9220 }
9221
9222
9223 static bfd_boolean
9224 is_reloc_sym_weak (bfd *abfd, Elf_Internal_Rela *rel)
9225 {
9226 unsigned long r_symndx = ELF32_R_SYM (rel->r_info);
9227 struct elf_link_hash_entry *h;
9228
9229 h = get_elf_r_symndx_hash_entry (abfd, r_symndx);
9230 if (h && h->root.type == bfd_link_hash_defweak)
9231 return TRUE;
9232 return FALSE;
9233 }
9234
9235
9236 static bfd_boolean
9237 pcrel_reloc_fits (xtensa_opcode opc,
9238 int opnd,
9239 bfd_vma self_address,
9240 bfd_vma dest_address)
9241 {
9242 xtensa_isa isa = xtensa_default_isa;
9243 uint32 valp = dest_address;
9244 if (xtensa_operand_do_reloc (isa, opc, opnd, &valp, self_address)
9245 || xtensa_operand_encode (isa, opc, opnd, &valp))
9246 return FALSE;
9247 return TRUE;
9248 }
9249
9250
9251 static int linkonce_len = sizeof (".gnu.linkonce.") - 1;
9252 static int insn_sec_len = sizeof (XTENSA_INSN_SEC_NAME) - 1;
9253 static int lit_sec_len = sizeof (XTENSA_LIT_SEC_NAME) - 1;
9254 static int prop_sec_len = sizeof (XTENSA_PROP_SEC_NAME) - 1;
9255
9256
9257 static bfd_boolean
9258 xtensa_is_property_section (asection *sec)
9259 {
9260 if (strncmp (XTENSA_INSN_SEC_NAME, sec->name, insn_sec_len) == 0
9261 || strncmp (XTENSA_LIT_SEC_NAME, sec->name, lit_sec_len) == 0
9262 || strncmp (XTENSA_PROP_SEC_NAME, sec->name, prop_sec_len) == 0)
9263 return TRUE;
9264
9265 if (strncmp (".gnu.linkonce.", sec->name, linkonce_len) == 0
9266 && (strncmp (&sec->name[linkonce_len], "x.", 2) == 0
9267 || strncmp (&sec->name[linkonce_len], "p.", 2) == 0
9268 || strncmp (&sec->name[linkonce_len], "prop.", 5) == 0))
9269 return TRUE;
9270
9271 return FALSE;
9272 }
9273
9274
9275 static bfd_boolean
9276 xtensa_is_littable_section (asection *sec)
9277 {
9278 if (strncmp (XTENSA_LIT_SEC_NAME, sec->name, lit_sec_len) == 0)
9279 return TRUE;
9280
9281 if (strncmp (".gnu.linkonce.", sec->name, linkonce_len) == 0
9282 && sec->name[linkonce_len] == 'p'
9283 && sec->name[linkonce_len + 1] == '.')
9284 return TRUE;
9285
9286 return FALSE;
9287 }
9288
9289
9290 static int
9291 internal_reloc_compare (const void *ap, const void *bp)
9292 {
9293 const Elf_Internal_Rela *a = (const Elf_Internal_Rela *) ap;
9294 const Elf_Internal_Rela *b = (const Elf_Internal_Rela *) bp;
9295
9296 if (a->r_offset != b->r_offset)
9297 return (a->r_offset - b->r_offset);
9298
9299 /* We don't need to sort on these criteria for correctness,
9300 but enforcing a more strict ordering prevents unstable qsort
9301 from behaving differently with different implementations.
9302 Without the code below we get correct but different results
9303 on Solaris 2.7 and 2.8. We would like to always produce the
9304 same results no matter the host. */
9305
9306 if (a->r_info != b->r_info)
9307 return (a->r_info - b->r_info);
9308
9309 return (a->r_addend - b->r_addend);
9310 }
9311
9312
9313 static int
9314 internal_reloc_matches (const void *ap, const void *bp)
9315 {
9316 const Elf_Internal_Rela *a = (const Elf_Internal_Rela *) ap;
9317 const Elf_Internal_Rela *b = (const Elf_Internal_Rela *) bp;
9318
9319 /* Check if one entry overlaps with the other; this shouldn't happen
9320 except when searching for a match. */
9321 return (a->r_offset - b->r_offset);
9322 }
9323
9324
9325 char *
9326 xtensa_get_property_section_name (asection *sec, const char *base_name)
9327 {
9328 if (strncmp (sec->name, ".gnu.linkonce.", linkonce_len) == 0)
9329 {
9330 char *prop_sec_name;
9331 const char *suffix;
9332 char *linkonce_kind = 0;
9333
9334 if (strcmp (base_name, XTENSA_INSN_SEC_NAME) == 0)
9335 linkonce_kind = "x.";
9336 else if (strcmp (base_name, XTENSA_LIT_SEC_NAME) == 0)
9337 linkonce_kind = "p.";
9338 else if (strcmp (base_name, XTENSA_PROP_SEC_NAME) == 0)
9339 linkonce_kind = "prop.";
9340 else
9341 abort ();
9342
9343 prop_sec_name = (char *) bfd_malloc (strlen (sec->name)
9344 + strlen (linkonce_kind) + 1);
9345 memcpy (prop_sec_name, ".gnu.linkonce.", linkonce_len);
9346 strcpy (prop_sec_name + linkonce_len, linkonce_kind);
9347
9348 suffix = sec->name + linkonce_len;
9349 /* For backward compatibility, replace "t." instead of inserting
9350 the new linkonce_kind (but not for "prop" sections). */
9351 if (strncmp (suffix, "t.", 2) == 0 && linkonce_kind[1] == '.')
9352 suffix += 2;
9353 strcat (prop_sec_name + linkonce_len, suffix);
9354
9355 return prop_sec_name;
9356 }
9357
9358 return strdup (base_name);
9359 }
9360
9361
9362 flagword
9363 xtensa_get_property_predef_flags (asection *sec)
9364 {
9365 if (strcmp (sec->name, XTENSA_INSN_SEC_NAME) == 0
9366 || strncmp (sec->name, ".gnu.linkonce.x.",
9367 sizeof ".gnu.linkonce.x." - 1) == 0)
9368 return (XTENSA_PROP_INSN
9369 | XTENSA_PROP_INSN_NO_TRANSFORM
9370 | XTENSA_PROP_INSN_NO_REORDER);
9371
9372 if (xtensa_is_littable_section (sec))
9373 return (XTENSA_PROP_LITERAL
9374 | XTENSA_PROP_INSN_NO_TRANSFORM
9375 | XTENSA_PROP_INSN_NO_REORDER);
9376
9377 return 0;
9378 }
9379
9380 \f
9381 /* Other functions called directly by the linker. */
9382
9383 bfd_boolean
9384 xtensa_callback_required_dependence (bfd *abfd,
9385 asection *sec,
9386 struct bfd_link_info *link_info,
9387 deps_callback_t callback,
9388 void *closure)
9389 {
9390 Elf_Internal_Rela *internal_relocs;
9391 bfd_byte *contents;
9392 unsigned i;
9393 bfd_boolean ok = TRUE;
9394 bfd_size_type sec_size;
9395
9396 sec_size = bfd_get_section_limit (abfd, sec);
9397
9398 /* ".plt*" sections have no explicit relocations but they contain L32R
9399 instructions that reference the corresponding ".got.plt*" sections. */
9400 if ((sec->flags & SEC_LINKER_CREATED) != 0
9401 && strncmp (sec->name, ".plt", 4) == 0)
9402 {
9403 asection *sgotplt;
9404
9405 /* Find the corresponding ".got.plt*" section. */
9406 if (sec->name[4] == '\0')
9407 sgotplt = bfd_get_section_by_name (sec->owner, ".got.plt");
9408 else
9409 {
9410 char got_name[14];
9411 int chunk = 0;
9412
9413 BFD_ASSERT (sec->name[4] == '.');
9414 chunk = strtol (&sec->name[5], NULL, 10);
9415
9416 sprintf (got_name, ".got.plt.%u", chunk);
9417 sgotplt = bfd_get_section_by_name (sec->owner, got_name);
9418 }
9419 BFD_ASSERT (sgotplt);
9420
9421 /* Assume worst-case offsets: L32R at the very end of the ".plt"
9422 section referencing a literal at the very beginning of
9423 ".got.plt". This is very close to the real dependence, anyway. */
9424 (*callback) (sec, sec_size, sgotplt, 0, closure);
9425 }
9426
9427 internal_relocs = retrieve_internal_relocs (abfd, sec,
9428 link_info->keep_memory);
9429 if (internal_relocs == NULL
9430 || sec->reloc_count == 0)
9431 return ok;
9432
9433 /* Cache the contents for the duration of this scan. */
9434 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
9435 if (contents == NULL && sec_size != 0)
9436 {
9437 ok = FALSE;
9438 goto error_return;
9439 }
9440
9441 if (!xtensa_default_isa)
9442 xtensa_default_isa = xtensa_isa_init (0, 0);
9443
9444 for (i = 0; i < sec->reloc_count; i++)
9445 {
9446 Elf_Internal_Rela *irel = &internal_relocs[i];
9447 if (is_l32r_relocation (abfd, sec, contents, irel))
9448 {
9449 r_reloc l32r_rel;
9450 asection *target_sec;
9451 bfd_vma target_offset;
9452
9453 r_reloc_init (&l32r_rel, abfd, irel, contents, sec_size);
9454 target_sec = NULL;
9455 target_offset = 0;
9456 /* L32Rs must be local to the input file. */
9457 if (r_reloc_is_defined (&l32r_rel))
9458 {
9459 target_sec = r_reloc_get_section (&l32r_rel);
9460 target_offset = l32r_rel.target_offset;
9461 }
9462 (*callback) (sec, irel->r_offset, target_sec, target_offset,
9463 closure);
9464 }
9465 }
9466
9467 error_return:
9468 release_internal_relocs (sec, internal_relocs);
9469 release_contents (sec, contents);
9470 return ok;
9471 }
9472
9473 /* The default literal sections should always be marked as "code" (i.e.,
9474 SHF_EXECINSTR). This is particularly important for the Linux kernel
9475 module loader so that the literals are not placed after the text. */
9476 static const struct bfd_elf_special_section elf_xtensa_special_sections[] =
9477 {
9478 { ".fini.literal", 13, 0, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR },
9479 { ".init.literal", 13, 0, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR },
9480 { ".literal", 8, 0, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR },
9481 { NULL, 0, 0, 0, 0 }
9482 };
9483 \f
9484 #ifndef ELF_ARCH
9485 #define TARGET_LITTLE_SYM bfd_elf32_xtensa_le_vec
9486 #define TARGET_LITTLE_NAME "elf32-xtensa-le"
9487 #define TARGET_BIG_SYM bfd_elf32_xtensa_be_vec
9488 #define TARGET_BIG_NAME "elf32-xtensa-be"
9489 #define ELF_ARCH bfd_arch_xtensa
9490
9491 #define ELF_MACHINE_CODE EM_XTENSA
9492 #define ELF_MACHINE_ALT1 EM_XTENSA_OLD
9493
9494 #if XCHAL_HAVE_MMU
9495 #define ELF_MAXPAGESIZE (1 << XCHAL_MMU_MIN_PTE_PAGE_SIZE)
9496 #else /* !XCHAL_HAVE_MMU */
9497 #define ELF_MAXPAGESIZE 1
9498 #endif /* !XCHAL_HAVE_MMU */
9499 #endif /* ELF_ARCH */
9500
9501 #define elf_backend_can_gc_sections 1
9502 #define elf_backend_can_refcount 1
9503 #define elf_backend_plt_readonly 1
9504 #define elf_backend_got_header_size 4
9505 #define elf_backend_want_dynbss 0
9506 #define elf_backend_want_got_plt 1
9507
9508 #define elf_info_to_howto elf_xtensa_info_to_howto_rela
9509
9510 #define bfd_elf32_bfd_merge_private_bfd_data elf_xtensa_merge_private_bfd_data
9511 #define bfd_elf32_new_section_hook elf_xtensa_new_section_hook
9512 #define bfd_elf32_bfd_print_private_bfd_data elf_xtensa_print_private_bfd_data
9513 #define bfd_elf32_bfd_relax_section elf_xtensa_relax_section
9514 #define bfd_elf32_bfd_reloc_type_lookup elf_xtensa_reloc_type_lookup
9515 #define bfd_elf32_bfd_set_private_flags elf_xtensa_set_private_flags
9516
9517 #define elf_backend_adjust_dynamic_symbol elf_xtensa_adjust_dynamic_symbol
9518 #define elf_backend_check_relocs elf_xtensa_check_relocs
9519 #define elf_backend_create_dynamic_sections elf_xtensa_create_dynamic_sections
9520 #define elf_backend_discard_info elf_xtensa_discard_info
9521 #define elf_backend_ignore_discarded_relocs elf_xtensa_ignore_discarded_relocs
9522 #define elf_backend_final_write_processing elf_xtensa_final_write_processing
9523 #define elf_backend_finish_dynamic_sections elf_xtensa_finish_dynamic_sections
9524 #define elf_backend_finish_dynamic_symbol elf_xtensa_finish_dynamic_symbol
9525 #define elf_backend_gc_mark_hook elf_xtensa_gc_mark_hook
9526 #define elf_backend_gc_sweep_hook elf_xtensa_gc_sweep_hook
9527 #define elf_backend_grok_prstatus elf_xtensa_grok_prstatus
9528 #define elf_backend_grok_psinfo elf_xtensa_grok_psinfo
9529 #define elf_backend_hide_symbol elf_xtensa_hide_symbol
9530 #define elf_backend_modify_segment_map elf_xtensa_modify_segment_map
9531 #define elf_backend_object_p elf_xtensa_object_p
9532 #define elf_backend_reloc_type_class elf_xtensa_reloc_type_class
9533 #define elf_backend_relocate_section elf_xtensa_relocate_section
9534 #define elf_backend_size_dynamic_sections elf_xtensa_size_dynamic_sections
9535 #define elf_backend_special_sections elf_xtensa_special_sections
9536
9537 #include "elf32-target.h"
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