1 /* Target-dependent code for FreeBSD/mips.
2
3 Copyright (C) 2017-2021 Free Software Foundation, Inc.
4
5 This file is part of GDB.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
19
20 #include "defs.h"
21 #include "osabi.h"
22 #include "regset.h"
23 #include "trad-frame.h"
24 #include "tramp-frame.h"
25
26 #include "fbsd-tdep.h"
27 #include "mips-tdep.h"
28 #include "mips-fbsd-tdep.h"
29
30 #include "solib-svr4.h"
31
32 /* Core file support. */
33
34 /* Number of registers in `struct reg' from <machine/reg.h>. The
35 first 38 follow the standard MIPS layout. The 39th holds
36 IC_INT_REG on RM7K and RM9K processors. The 40th is a dummy for
37 padding. */
38 #define MIPS_FBSD_NUM_GREGS 40
39
40 /* Number of registers in `struct fpreg' from <machine/reg.h>. The
41 first 32 hold floating point registers. 33 holds the FSR. The
42 34th holds FIR on FreeBSD 12.0 and newer kernels. On older kernels
43 it was a zero-filled dummy for padding. */
44 #define MIPS_FBSD_NUM_FPREGS 34
45
46 /* Supply a single register. The register size might not match, so use
47 regcache->raw_supply_integer (). */
48
49 static void
mips_fbsd_supply_reg(struct regcache * regcache,int regnum,const void * addr,size_t len)50 mips_fbsd_supply_reg (struct regcache *regcache, int regnum, const void *addr,
51 size_t len)
52 {
53 regcache->raw_supply_integer (regnum, (const gdb_byte *) addr, len, true);
54 }
55
56 /* Collect a single register. The register size might not match, so use
57 regcache->raw_collect_integer (). */
58
59 static void
mips_fbsd_collect_reg(const struct regcache * regcache,int regnum,void * addr,size_t len)60 mips_fbsd_collect_reg (const struct regcache *regcache, int regnum, void *addr,
61 size_t len)
62 {
63 regcache->raw_collect_integer (regnum, (gdb_byte *) addr, len, true);
64 }
65
66 /* Supply the floating-point registers stored in FPREGS to REGCACHE.
67 Each floating-point register in FPREGS is REGSIZE bytes in
68 length. */
69
70 void
mips_fbsd_supply_fpregs(struct regcache * regcache,int regnum,const void * fpregs,size_t regsize)71 mips_fbsd_supply_fpregs (struct regcache *regcache, int regnum,
72 const void *fpregs, size_t regsize)
73 {
74 struct gdbarch *gdbarch = regcache->arch ();
75 const gdb_byte *regs = (const gdb_byte *) fpregs;
76 int i, fp0num;
77
78 fp0num = mips_regnum (gdbarch)->fp0;
79 for (i = 0; i <= 32; i++)
80 if (regnum == fp0num + i || regnum == -1)
81 mips_fbsd_supply_reg (regcache, fp0num + i,
82 regs + i * regsize, regsize);
83 if (regnum == mips_regnum (gdbarch)->fp_control_status || regnum == -1)
84 mips_fbsd_supply_reg (regcache, mips_regnum (gdbarch)->fp_control_status,
85 regs + 32 * regsize, regsize);
86 if ((regnum == mips_regnum (gdbarch)->fp_implementation_revision
87 || regnum == -1)
88 && extract_unsigned_integer (regs + 33 * regsize, regsize,
89 gdbarch_byte_order (gdbarch)) != 0)
90 mips_fbsd_supply_reg (regcache,
91 mips_regnum (gdbarch)->fp_implementation_revision,
92 regs + 33 * regsize, regsize);
93 }
94
95 /* Supply the general-purpose registers stored in GREGS to REGCACHE.
96 Each general-purpose register in GREGS is REGSIZE bytes in
97 length. */
98
99 void
mips_fbsd_supply_gregs(struct regcache * regcache,int regnum,const void * gregs,size_t regsize)100 mips_fbsd_supply_gregs (struct regcache *regcache, int regnum,
101 const void *gregs, size_t regsize)
102 {
103 struct gdbarch *gdbarch = regcache->arch ();
104 const gdb_byte *regs = (const gdb_byte *) gregs;
105 int i;
106
107 for (i = 0; i <= mips_regnum (gdbarch)->pc; i++)
108 if (regnum == i || regnum == -1)
109 mips_fbsd_supply_reg (regcache, i, regs + i * regsize, regsize);
110 }
111
112 /* Collect the floating-point registers from REGCACHE and store them
113 in FPREGS. Each floating-point register in FPREGS is REGSIZE bytes
114 in length. */
115
116 void
mips_fbsd_collect_fpregs(const struct regcache * regcache,int regnum,void * fpregs,size_t regsize)117 mips_fbsd_collect_fpregs (const struct regcache *regcache, int regnum,
118 void *fpregs, size_t regsize)
119 {
120 struct gdbarch *gdbarch = regcache->arch ();
121 gdb_byte *regs = (gdb_byte *) fpregs;
122 int i, fp0num;
123
124 fp0num = mips_regnum (gdbarch)->fp0;
125 for (i = 0; i < 32; i++)
126 if (regnum == fp0num + i || regnum == -1)
127 mips_fbsd_collect_reg (regcache, fp0num + i,
128 regs + i * regsize, regsize);
129 if (regnum == mips_regnum (gdbarch)->fp_control_status || regnum == -1)
130 mips_fbsd_collect_reg (regcache, mips_regnum (gdbarch)->fp_control_status,
131 regs + 32 * regsize, regsize);
132 if (regnum == mips_regnum (gdbarch)->fp_implementation_revision
133 || regnum == -1)
134 mips_fbsd_collect_reg (regcache,
135 mips_regnum (gdbarch)->fp_implementation_revision,
136 regs + 33 * regsize, regsize);
137 }
138
139 /* Collect the general-purpose registers from REGCACHE and store them
140 in GREGS. Each general-purpose register in GREGS is REGSIZE bytes
141 in length. */
142
143 void
mips_fbsd_collect_gregs(const struct regcache * regcache,int regnum,void * gregs,size_t regsize)144 mips_fbsd_collect_gregs (const struct regcache *regcache, int regnum,
145 void *gregs, size_t regsize)
146 {
147 struct gdbarch *gdbarch = regcache->arch ();
148 gdb_byte *regs = (gdb_byte *) gregs;
149 int i;
150
151 for (i = 0; i <= mips_regnum (gdbarch)->pc; i++)
152 if (regnum == i || regnum == -1)
153 mips_fbsd_collect_reg (regcache, i, regs + i * regsize, regsize);
154 }
155
156 /* Supply register REGNUM from the buffer specified by FPREGS and LEN
157 in the floating-point register set REGSET to register cache
158 REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
159
160 static void
mips_fbsd_supply_fpregset(const struct regset * regset,struct regcache * regcache,int regnum,const void * fpregs,size_t len)161 mips_fbsd_supply_fpregset (const struct regset *regset,
162 struct regcache *regcache,
163 int regnum, const void *fpregs, size_t len)
164 {
165 size_t regsize = mips_abi_regsize (regcache->arch ());
166
167 gdb_assert (len >= MIPS_FBSD_NUM_FPREGS * regsize);
168
169 mips_fbsd_supply_fpregs (regcache, regnum, fpregs, regsize);
170 }
171
172 /* Collect register REGNUM from the register cache REGCACHE and store
173 it in the buffer specified by FPREGS and LEN in the floating-point
174 register set REGSET. If REGNUM is -1, do this for all registers in
175 REGSET. */
176
177 static void
mips_fbsd_collect_fpregset(const struct regset * regset,const struct regcache * regcache,int regnum,void * fpregs,size_t len)178 mips_fbsd_collect_fpregset (const struct regset *regset,
179 const struct regcache *regcache,
180 int regnum, void *fpregs, size_t len)
181 {
182 size_t regsize = mips_abi_regsize (regcache->arch ());
183
184 gdb_assert (len >= MIPS_FBSD_NUM_FPREGS * regsize);
185
186 mips_fbsd_collect_fpregs (regcache, regnum, fpregs, regsize);
187 }
188
189 /* Supply register REGNUM from the buffer specified by GREGS and LEN
190 in the general-purpose register set REGSET to register cache
191 REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
192
193 static void
mips_fbsd_supply_gregset(const struct regset * regset,struct regcache * regcache,int regnum,const void * gregs,size_t len)194 mips_fbsd_supply_gregset (const struct regset *regset,
195 struct regcache *regcache, int regnum,
196 const void *gregs, size_t len)
197 {
198 size_t regsize = mips_abi_regsize (regcache->arch ());
199
200 gdb_assert (len >= MIPS_FBSD_NUM_GREGS * regsize);
201
202 mips_fbsd_supply_gregs (regcache, regnum, gregs, regsize);
203 }
204
205 /* Collect register REGNUM from the register cache REGCACHE and store
206 it in the buffer specified by GREGS and LEN in the general-purpose
207 register set REGSET. If REGNUM is -1, do this for all registers in
208 REGSET. */
209
210 static void
mips_fbsd_collect_gregset(const struct regset * regset,const struct regcache * regcache,int regnum,void * gregs,size_t len)211 mips_fbsd_collect_gregset (const struct regset *regset,
212 const struct regcache *regcache,
213 int regnum, void *gregs, size_t len)
214 {
215 size_t regsize = mips_abi_regsize (regcache->arch ());
216
217 gdb_assert (len >= MIPS_FBSD_NUM_GREGS * regsize);
218
219 mips_fbsd_collect_gregs (regcache, regnum, gregs, regsize);
220 }
221
222 /* FreeBSD/mips register sets. */
223
224 static const struct regset mips_fbsd_gregset =
225 {
226 NULL,
227 mips_fbsd_supply_gregset,
228 mips_fbsd_collect_gregset,
229 };
230
231 static const struct regset mips_fbsd_fpregset =
232 {
233 NULL,
234 mips_fbsd_supply_fpregset,
235 mips_fbsd_collect_fpregset,
236 };
237
238 /* Iterate over core file register note sections. */
239
240 static void
mips_fbsd_iterate_over_regset_sections(struct gdbarch * gdbarch,iterate_over_regset_sections_cb * cb,void * cb_data,const struct regcache * regcache)241 mips_fbsd_iterate_over_regset_sections (struct gdbarch *gdbarch,
242 iterate_over_regset_sections_cb *cb,
243 void *cb_data,
244 const struct regcache *regcache)
245 {
246 size_t regsize = mips_abi_regsize (gdbarch);
247
248 cb (".reg", MIPS_FBSD_NUM_GREGS * regsize, MIPS_FBSD_NUM_GREGS * regsize,
249 &mips_fbsd_gregset, NULL, cb_data);
250 cb (".reg2", MIPS_FBSD_NUM_FPREGS * regsize, MIPS_FBSD_NUM_FPREGS * regsize,
251 &mips_fbsd_fpregset, NULL, cb_data);
252 }
253
254 /* Signal trampoline support. */
255
256 #define FBSD_SYS_sigreturn 417
257
258 #define MIPS_INST_LI_V0_SIGRETURN 0x24020000 + FBSD_SYS_sigreturn
259 #define MIPS_INST_SYSCALL 0x0000000c
260 #define MIPS_INST_BREAK 0x0000000d
261
262 #define O32_SIGFRAME_UCONTEXT_OFFSET (16)
263 #define O32_SIGSET_T_SIZE (16)
264
265 #define O32_UCONTEXT_ONSTACK (O32_SIGSET_T_SIZE)
266 #define O32_UCONTEXT_PC (O32_UCONTEXT_ONSTACK + 4)
267 #define O32_UCONTEXT_REGS (O32_UCONTEXT_PC + 4)
268 #define O32_UCONTEXT_SR (O32_UCONTEXT_REGS + 4 * 32)
269 #define O32_UCONTEXT_LO (O32_UCONTEXT_SR + 4)
270 #define O32_UCONTEXT_HI (O32_UCONTEXT_LO + 4)
271 #define O32_UCONTEXT_FPUSED (O32_UCONTEXT_HI + 4)
272 #define O32_UCONTEXT_FPREGS (O32_UCONTEXT_FPUSED + 4)
273
274 #define O32_UCONTEXT_REG_SIZE 4
275
276 static void
mips_fbsd_sigframe_init(const struct tramp_frame * self,struct frame_info * this_frame,struct trad_frame_cache * cache,CORE_ADDR func)277 mips_fbsd_sigframe_init (const struct tramp_frame *self,
278 struct frame_info *this_frame,
279 struct trad_frame_cache *cache,
280 CORE_ADDR func)
281 {
282 struct gdbarch *gdbarch = get_frame_arch (this_frame);
283 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
284 CORE_ADDR sp, ucontext_addr, addr;
285 int regnum;
286 gdb_byte buf[4];
287
288 /* We find the appropriate instance of `ucontext_t' at a
289 fixed offset in the signal frame. */
290 sp = get_frame_register_signed (this_frame,
291 MIPS_SP_REGNUM + gdbarch_num_regs (gdbarch));
292 ucontext_addr = sp + O32_SIGFRAME_UCONTEXT_OFFSET;
293
294 /* PC. */
295 regnum = mips_regnum (gdbarch)->pc;
296 trad_frame_set_reg_addr (cache,
297 regnum + gdbarch_num_regs (gdbarch),
298 ucontext_addr + O32_UCONTEXT_PC);
299
300 /* GPRs. */
301 for (regnum = MIPS_ZERO_REGNUM, addr = ucontext_addr + O32_UCONTEXT_REGS;
302 regnum <= MIPS_RA_REGNUM; regnum++, addr += O32_UCONTEXT_REG_SIZE)
303 trad_frame_set_reg_addr (cache,
304 regnum + gdbarch_num_regs (gdbarch),
305 addr);
306
307 regnum = MIPS_PS_REGNUM;
308 trad_frame_set_reg_addr (cache,
309 regnum + gdbarch_num_regs (gdbarch),
310 ucontext_addr + O32_UCONTEXT_SR);
311
312 /* HI and LO. */
313 regnum = mips_regnum (gdbarch)->lo;
314 trad_frame_set_reg_addr (cache,
315 regnum + gdbarch_num_regs (gdbarch),
316 ucontext_addr + O32_UCONTEXT_LO);
317 regnum = mips_regnum (gdbarch)->hi;
318 trad_frame_set_reg_addr (cache,
319 regnum + gdbarch_num_regs (gdbarch),
320 ucontext_addr + O32_UCONTEXT_HI);
321
322 if (target_read_memory (ucontext_addr + O32_UCONTEXT_FPUSED, buf, 4) == 0
323 && extract_unsigned_integer (buf, 4, byte_order) != 0)
324 {
325 for (regnum = 0, addr = ucontext_addr + O32_UCONTEXT_FPREGS;
326 regnum < 32; regnum++, addr += O32_UCONTEXT_REG_SIZE)
327 trad_frame_set_reg_addr (cache,
328 regnum + gdbarch_fp0_regnum (gdbarch),
329 addr);
330 trad_frame_set_reg_addr (cache, mips_regnum (gdbarch)->fp_control_status,
331 addr);
332 }
333
334 trad_frame_set_id (cache, frame_id_build (sp, func));
335 }
336
337 #define MIPS_INST_ADDIU_A0_SP_O32 (0x27a40000 \
338 + O32_SIGFRAME_UCONTEXT_OFFSET)
339
340 static const struct tramp_frame mips_fbsd_sigframe =
341 {
342 SIGTRAMP_FRAME,
343 MIPS_INSN32_SIZE,
344 {
345 { MIPS_INST_ADDIU_A0_SP_O32, ULONGEST_MAX }, /* addiu a0, sp, SIGF_UC */
346 { MIPS_INST_LI_V0_SIGRETURN, ULONGEST_MAX }, /* li v0, SYS_sigreturn */
347 { MIPS_INST_SYSCALL, ULONGEST_MAX }, /* syscall */
348 { MIPS_INST_BREAK, ULONGEST_MAX }, /* break */
349 { TRAMP_SENTINEL_INSN, ULONGEST_MAX }
350 },
351 mips_fbsd_sigframe_init
352 };
353
354 #define N64_SIGFRAME_UCONTEXT_OFFSET (32)
355 #define N64_SIGSET_T_SIZE (16)
356
357 #define N64_UCONTEXT_ONSTACK (N64_SIGSET_T_SIZE)
358 #define N64_UCONTEXT_PC (N64_UCONTEXT_ONSTACK + 8)
359 #define N64_UCONTEXT_REGS (N64_UCONTEXT_PC + 8)
360 #define N64_UCONTEXT_SR (N64_UCONTEXT_REGS + 8 * 32)
361 #define N64_UCONTEXT_LO (N64_UCONTEXT_SR + 8)
362 #define N64_UCONTEXT_HI (N64_UCONTEXT_LO + 8)
363 #define N64_UCONTEXT_FPUSED (N64_UCONTEXT_HI + 8)
364 #define N64_UCONTEXT_FPREGS (N64_UCONTEXT_FPUSED + 8)
365
366 #define N64_UCONTEXT_REG_SIZE 8
367
368 static void
mips64_fbsd_sigframe_init(const struct tramp_frame * self,struct frame_info * this_frame,struct trad_frame_cache * cache,CORE_ADDR func)369 mips64_fbsd_sigframe_init (const struct tramp_frame *self,
370 struct frame_info *this_frame,
371 struct trad_frame_cache *cache,
372 CORE_ADDR func)
373 {
374 struct gdbarch *gdbarch = get_frame_arch (this_frame);
375 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
376 CORE_ADDR sp, ucontext_addr, addr;
377 int regnum;
378 gdb_byte buf[4];
379
380 /* We find the appropriate instance of `ucontext_t' at a
381 fixed offset in the signal frame. */
382 sp = get_frame_register_signed (this_frame,
383 MIPS_SP_REGNUM + gdbarch_num_regs (gdbarch));
384 ucontext_addr = sp + N64_SIGFRAME_UCONTEXT_OFFSET;
385
386 /* PC. */
387 regnum = mips_regnum (gdbarch)->pc;
388 trad_frame_set_reg_addr (cache,
389 regnum + gdbarch_num_regs (gdbarch),
390 ucontext_addr + N64_UCONTEXT_PC);
391
392 /* GPRs. */
393 for (regnum = MIPS_ZERO_REGNUM, addr = ucontext_addr + N64_UCONTEXT_REGS;
394 regnum <= MIPS_RA_REGNUM; regnum++, addr += N64_UCONTEXT_REG_SIZE)
395 trad_frame_set_reg_addr (cache,
396 regnum + gdbarch_num_regs (gdbarch),
397 addr);
398
399 regnum = MIPS_PS_REGNUM;
400 trad_frame_set_reg_addr (cache,
401 regnum + gdbarch_num_regs (gdbarch),
402 ucontext_addr + N64_UCONTEXT_SR);
403
404 /* HI and LO. */
405 regnum = mips_regnum (gdbarch)->lo;
406 trad_frame_set_reg_addr (cache,
407 regnum + gdbarch_num_regs (gdbarch),
408 ucontext_addr + N64_UCONTEXT_LO);
409 regnum = mips_regnum (gdbarch)->hi;
410 trad_frame_set_reg_addr (cache,
411 regnum + gdbarch_num_regs (gdbarch),
412 ucontext_addr + N64_UCONTEXT_HI);
413
414 if (target_read_memory (ucontext_addr + N64_UCONTEXT_FPUSED, buf, 4) == 0
415 && extract_unsigned_integer (buf, 4, byte_order) != 0)
416 {
417 for (regnum = 0, addr = ucontext_addr + N64_UCONTEXT_FPREGS;
418 regnum < 32; regnum++, addr += N64_UCONTEXT_REG_SIZE)
419 trad_frame_set_reg_addr (cache,
420 regnum + gdbarch_fp0_regnum (gdbarch),
421 addr);
422 trad_frame_set_reg_addr (cache, mips_regnum (gdbarch)->fp_control_status,
423 addr);
424 }
425
426 trad_frame_set_id (cache, frame_id_build (sp, func));
427 }
428
429 #define MIPS_INST_ADDIU_A0_SP_N32 (0x27a40000 \
430 + N64_SIGFRAME_UCONTEXT_OFFSET)
431
432 static const struct tramp_frame mipsn32_fbsd_sigframe =
433 {
434 SIGTRAMP_FRAME,
435 MIPS_INSN32_SIZE,
436 {
437 { MIPS_INST_ADDIU_A0_SP_N32, ULONGEST_MAX }, /* addiu a0, sp, SIGF_UC */
438 { MIPS_INST_LI_V0_SIGRETURN, ULONGEST_MAX }, /* li v0, SYS_sigreturn */
439 { MIPS_INST_SYSCALL, ULONGEST_MAX }, /* syscall */
440 { MIPS_INST_BREAK, ULONGEST_MAX }, /* break */
441 { TRAMP_SENTINEL_INSN, ULONGEST_MAX }
442 },
443 mips64_fbsd_sigframe_init
444 };
445
446 #define MIPS_INST_DADDIU_A0_SP_N64 (0x67a40000 \
447 + N64_SIGFRAME_UCONTEXT_OFFSET)
448
449 static const struct tramp_frame mips64_fbsd_sigframe =
450 {
451 SIGTRAMP_FRAME,
452 MIPS_INSN32_SIZE,
453 {
454 { MIPS_INST_DADDIU_A0_SP_N64, ULONGEST_MAX }, /* daddiu a0, sp, SIGF_UC */
455 { MIPS_INST_LI_V0_SIGRETURN, ULONGEST_MAX }, /* li v0, SYS_sigreturn */
456 { MIPS_INST_SYSCALL, ULONGEST_MAX }, /* syscall */
457 { MIPS_INST_BREAK, ULONGEST_MAX }, /* break */
458 { TRAMP_SENTINEL_INSN, ULONGEST_MAX }
459 },
460 mips64_fbsd_sigframe_init
461 };
462
463 /* Shared library support. */
464
465 /* FreeBSD/mips can use an alternate routine in the runtime linker to
466 resolve functions. */
467
468 static CORE_ADDR
mips_fbsd_skip_solib_resolver(struct gdbarch * gdbarch,CORE_ADDR pc)469 mips_fbsd_skip_solib_resolver (struct gdbarch *gdbarch, CORE_ADDR pc)
470 {
471 struct bound_minimal_symbol msym
472 = lookup_bound_minimal_symbol ("_mips_rtld_bind");
473 if (msym.minsym != nullptr && BMSYMBOL_VALUE_ADDRESS (msym) == pc)
474 return frame_unwind_caller_pc (get_current_frame ());
475
476 return fbsd_skip_solib_resolver (gdbarch, pc);
477 }
478
479 /* FreeBSD/mips uses a slightly different `struct link_map' than the
480 other FreeBSD platforms as it includes an additional `l_off'
481 member. */
482
483 static struct link_map_offsets *
mips_fbsd_ilp32_fetch_link_map_offsets(void)484 mips_fbsd_ilp32_fetch_link_map_offsets (void)
485 {
486 static struct link_map_offsets lmo;
487 static struct link_map_offsets *lmp = NULL;
488
489 if (lmp == NULL)
490 {
491 lmp = &lmo;
492
493 lmo.r_version_offset = 0;
494 lmo.r_version_size = 4;
495 lmo.r_map_offset = 4;
496 lmo.r_brk_offset = 8;
497 lmo.r_ldsomap_offset = -1;
498
499 lmo.link_map_size = 24;
500 lmo.l_addr_offset = 0;
501 lmo.l_name_offset = 8;
502 lmo.l_ld_offset = 12;
503 lmo.l_next_offset = 16;
504 lmo.l_prev_offset = 20;
505 }
506
507 return lmp;
508 }
509
510 static struct link_map_offsets *
mips_fbsd_lp64_fetch_link_map_offsets(void)511 mips_fbsd_lp64_fetch_link_map_offsets (void)
512 {
513 static struct link_map_offsets lmo;
514 static struct link_map_offsets *lmp = NULL;
515
516 if (lmp == NULL)
517 {
518 lmp = &lmo;
519
520 lmo.r_version_offset = 0;
521 lmo.r_version_size = 4;
522 lmo.r_map_offset = 8;
523 lmo.r_brk_offset = 16;
524 lmo.r_ldsomap_offset = -1;
525
526 lmo.link_map_size = 48;
527 lmo.l_addr_offset = 0;
528 lmo.l_name_offset = 16;
529 lmo.l_ld_offset = 24;
530 lmo.l_next_offset = 32;
531 lmo.l_prev_offset = 40;
532 }
533
534 return lmp;
535 }
536
537 static void
mips_fbsd_init_abi(struct gdbarch_info info,struct gdbarch * gdbarch)538 mips_fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
539 {
540 enum mips_abi abi = mips_abi (gdbarch);
541
542 /* Generic FreeBSD support. */
543 fbsd_init_abi (info, gdbarch);
544
545 set_gdbarch_software_single_step (gdbarch, mips_software_single_step);
546
547 switch (abi)
548 {
549 case MIPS_ABI_O32:
550 tramp_frame_prepend_unwinder (gdbarch, &mips_fbsd_sigframe);
551 break;
552 case MIPS_ABI_N32:
553 tramp_frame_prepend_unwinder (gdbarch, &mipsn32_fbsd_sigframe);
554 break;
555 case MIPS_ABI_N64:
556 tramp_frame_prepend_unwinder (gdbarch, &mips64_fbsd_sigframe);
557 break;
558 }
559
560 set_gdbarch_iterate_over_regset_sections
561 (gdbarch, mips_fbsd_iterate_over_regset_sections);
562
563 set_gdbarch_skip_solib_resolver (gdbarch, mips_fbsd_skip_solib_resolver);
564
565 /* FreeBSD/mips has SVR4-style shared libraries. */
566 set_solib_svr4_fetch_link_map_offsets
567 (gdbarch, (gdbarch_ptr_bit (gdbarch) == 32 ?
568 mips_fbsd_ilp32_fetch_link_map_offsets :
569 mips_fbsd_lp64_fetch_link_map_offsets));
570 }
571
572 void _initialize_mips_fbsd_tdep ();
573 void
_initialize_mips_fbsd_tdep()574 _initialize_mips_fbsd_tdep ()
575 {
576 gdbarch_register_osabi (bfd_arch_mips, 0, GDB_OSABI_FREEBSD,
577 mips_fbsd_init_abi);
578 }
579