| 1 | /* Target-dependent code for FreeBSD/mips. |
| 2 | |
| 3 | Copyright (C) 2017 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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_gregset, |
| 249 | NULL, cb_data); |
| 250 | cb (".reg2", MIPS_FBSD_NUM_FPREGS * regsize, &mips_fbsd_fpregset, |
| 251 | 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 |
| 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, -1 }, /* addiu a0, sp, SIGF_UC */ |
| 346 | { MIPS_INST_LI_V0_SIGRETURN, -1 }, /* li v0, SYS_sigreturn */ |
| 347 | { MIPS_INST_SYSCALL, -1 }, /* syscall */ |
| 348 | { MIPS_INST_BREAK, -1 }, /* break */ |
| 349 | { TRAMP_SENTINEL_INSN, -1 } |
| 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 |
| 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, -1 }, /* addiu a0, sp, SIGF_UC */ |
| 438 | { MIPS_INST_LI_V0_SIGRETURN, -1 }, /* li v0, SYS_sigreturn */ |
| 439 | { MIPS_INST_SYSCALL, -1 }, /* syscall */ |
| 440 | { MIPS_INST_BREAK, -1 }, /* break */ |
| 441 | { TRAMP_SENTINEL_INSN, -1 } |
| 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, -1 }, /* daddiu a0, sp, SIGF_UC */ |
| 455 | { MIPS_INST_LI_V0_SIGRETURN, -1 }, /* li v0, SYS_sigreturn */ |
| 456 | { MIPS_INST_SYSCALL, -1 }, /* syscall */ |
| 457 | { MIPS_INST_BREAK, -1 }, /* break */ |
| 458 | { TRAMP_SENTINEL_INSN, -1 } |
| 459 | }, |
| 460 | mips64_fbsd_sigframe_init |
| 461 | }; |
| 462 | |
| 463 | /* Shared library support. */ |
| 464 | |
| 465 | /* FreeBSD/mips uses a slightly different `struct link_map' than the |
| 466 | other FreeBSD platforms as it includes an additional `l_off' |
| 467 | member. */ |
| 468 | |
| 469 | static struct link_map_offsets * |
| 470 | mips_fbsd_ilp32_fetch_link_map_offsets (void) |
| 471 | { |
| 472 | static struct link_map_offsets lmo; |
| 473 | static struct link_map_offsets *lmp = NULL; |
| 474 | |
| 475 | if (lmp == NULL) |
| 476 | { |
| 477 | lmp = &lmo; |
| 478 | |
| 479 | lmo.r_version_offset = 0; |
| 480 | lmo.r_version_size = 4; |
| 481 | lmo.r_map_offset = 4; |
| 482 | lmo.r_brk_offset = 8; |
| 483 | lmo.r_ldsomap_offset = -1; |
| 484 | |
| 485 | lmo.link_map_size = 24; |
| 486 | lmo.l_addr_offset = 0; |
| 487 | lmo.l_name_offset = 8; |
| 488 | lmo.l_ld_offset = 12; |
| 489 | lmo.l_next_offset = 16; |
| 490 | lmo.l_prev_offset = 20; |
| 491 | } |
| 492 | |
| 493 | return lmp; |
| 494 | } |
| 495 | |
| 496 | static struct link_map_offsets * |
| 497 | mips_fbsd_lp64_fetch_link_map_offsets (void) |
| 498 | { |
| 499 | static struct link_map_offsets lmo; |
| 500 | static struct link_map_offsets *lmp = NULL; |
| 501 | |
| 502 | if (lmp == NULL) |
| 503 | { |
| 504 | lmp = &lmo; |
| 505 | |
| 506 | lmo.r_version_offset = 0; |
| 507 | lmo.r_version_size = 4; |
| 508 | lmo.r_map_offset = 8; |
| 509 | lmo.r_brk_offset = 16; |
| 510 | lmo.r_ldsomap_offset = -1; |
| 511 | |
| 512 | lmo.link_map_size = 48; |
| 513 | lmo.l_addr_offset = 0; |
| 514 | lmo.l_name_offset = 16; |
| 515 | lmo.l_ld_offset = 24; |
| 516 | lmo.l_next_offset = 32; |
| 517 | lmo.l_prev_offset = 40; |
| 518 | } |
| 519 | |
| 520 | return lmp; |
| 521 | } |
| 522 | |
| 523 | static void |
| 524 | mips_fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| 525 | { |
| 526 | enum mips_abi abi = mips_abi (gdbarch); |
| 527 | |
| 528 | /* Generic FreeBSD support. */ |
| 529 | fbsd_init_abi (info, gdbarch); |
| 530 | |
| 531 | set_gdbarch_software_single_step (gdbarch, mips_software_single_step); |
| 532 | |
| 533 | switch (abi) |
| 534 | { |
| 535 | case MIPS_ABI_O32: |
| 536 | tramp_frame_prepend_unwinder (gdbarch, &mips_fbsd_sigframe); |
| 537 | break; |
| 538 | case MIPS_ABI_N32: |
| 539 | tramp_frame_prepend_unwinder (gdbarch, &mipsn32_fbsd_sigframe); |
| 540 | break; |
| 541 | case MIPS_ABI_N64: |
| 542 | tramp_frame_prepend_unwinder (gdbarch, &mips64_fbsd_sigframe); |
| 543 | break; |
| 544 | } |
| 545 | |
| 546 | set_gdbarch_iterate_over_regset_sections |
| 547 | (gdbarch, mips_fbsd_iterate_over_regset_sections); |
| 548 | |
| 549 | /* FreeBSD/mips has SVR4-style shared libraries. */ |
| 550 | set_solib_svr4_fetch_link_map_offsets |
| 551 | (gdbarch, (gdbarch_ptr_bit (gdbarch) == 32 ? |
| 552 | mips_fbsd_ilp32_fetch_link_map_offsets : |
| 553 | mips_fbsd_lp64_fetch_link_map_offsets)); |
| 554 | } |
| 555 | |
| 556 | void |
| 557 | _initialize_mips_fbsd_tdep (void) |
| 558 | { |
| 559 | gdbarch_register_osabi (bfd_arch_mips, 0, GDB_OSABI_FREEBSD, |
| 560 | mips_fbsd_init_abi); |
| 561 | } |