| 1 | /* Target-dependent code for GNU/Linux on MIPS processors. |
| 2 | |
| 3 | Copyright 2001, 2002 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 2 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, write to the Free Software |
| 19 | Foundation, Inc., 59 Temple Place - Suite 330, |
| 20 | Boston, MA 02111-1307, USA. */ |
| 21 | |
| 22 | #include "defs.h" |
| 23 | #include "gdbcore.h" |
| 24 | #include "target.h" |
| 25 | #include "solib-svr4.h" |
| 26 | #include "osabi.h" |
| 27 | #include "mips-tdep.h" |
| 28 | #include "gdb_string.h" |
| 29 | #include "gdb_assert.h" |
| 30 | |
| 31 | /* Copied from <asm/elf.h>. */ |
| 32 | #define ELF_NGREG 45 |
| 33 | #define ELF_NFPREG 33 |
| 34 | |
| 35 | typedef unsigned char elf_greg_t[4]; |
| 36 | typedef elf_greg_t elf_gregset_t[ELF_NGREG]; |
| 37 | |
| 38 | typedef unsigned char elf_fpreg_t[8]; |
| 39 | typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG]; |
| 40 | |
| 41 | /* 0 - 31 are integer registers, 32 - 63 are fp registers. */ |
| 42 | #define FPR_BASE 32 |
| 43 | #define PC 64 |
| 44 | #define CAUSE 65 |
| 45 | #define BADVADDR 66 |
| 46 | #define MMHI 67 |
| 47 | #define MMLO 68 |
| 48 | #define FPC_CSR 69 |
| 49 | #define FPC_EIR 70 |
| 50 | |
| 51 | #define EF_REG0 6 |
| 52 | #define EF_REG31 37 |
| 53 | #define EF_LO 38 |
| 54 | #define EF_HI 39 |
| 55 | #define EF_CP0_EPC 40 |
| 56 | #define EF_CP0_BADVADDR 41 |
| 57 | #define EF_CP0_STATUS 42 |
| 58 | #define EF_CP0_CAUSE 43 |
| 59 | |
| 60 | #define EF_SIZE 180 |
| 61 | |
| 62 | /* Figure out where the longjmp will land. |
| 63 | We expect the first arg to be a pointer to the jmp_buf structure from |
| 64 | which we extract the pc (MIPS_LINUX_JB_PC) that we will land at. The pc |
| 65 | is copied into PC. This routine returns 1 on success. */ |
| 66 | |
| 67 | #define MIPS_LINUX_JB_ELEMENT_SIZE 4 |
| 68 | #define MIPS_LINUX_JB_PC 0 |
| 69 | |
| 70 | static int |
| 71 | mips_linux_get_longjmp_target (CORE_ADDR *pc) |
| 72 | { |
| 73 | CORE_ADDR jb_addr; |
| 74 | char buf[TARGET_PTR_BIT / TARGET_CHAR_BIT]; |
| 75 | |
| 76 | jb_addr = read_register (A0_REGNUM); |
| 77 | |
| 78 | if (target_read_memory (jb_addr |
| 79 | + MIPS_LINUX_JB_PC * MIPS_LINUX_JB_ELEMENT_SIZE, |
| 80 | buf, TARGET_PTR_BIT / TARGET_CHAR_BIT)) |
| 81 | return 0; |
| 82 | |
| 83 | *pc = extract_unsigned_integer (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT); |
| 84 | |
| 85 | return 1; |
| 86 | } |
| 87 | |
| 88 | /* Transform the bits comprising a 32-bit register to the right |
| 89 | size for supply_register(). This is needed when MIPS_REGSIZE is 8. */ |
| 90 | |
| 91 | static void |
| 92 | supply_32bit_reg (int regnum, const void *addr) |
| 93 | { |
| 94 | char buf[MAX_REGISTER_SIZE]; |
| 95 | store_signed_integer (buf, REGISTER_RAW_SIZE (regnum), |
| 96 | extract_signed_integer (addr, 4)); |
| 97 | supply_register (regnum, buf); |
| 98 | } |
| 99 | |
| 100 | /* Unpack an elf_gregset_t into GDB's register cache. */ |
| 101 | |
| 102 | void |
| 103 | supply_gregset (elf_gregset_t *gregsetp) |
| 104 | { |
| 105 | int regi; |
| 106 | elf_greg_t *regp = *gregsetp; |
| 107 | char zerobuf[MAX_REGISTER_SIZE]; |
| 108 | |
| 109 | memset (zerobuf, 0, MAX_REGISTER_SIZE); |
| 110 | |
| 111 | for (regi = EF_REG0; regi <= EF_REG31; regi++) |
| 112 | supply_32bit_reg ((regi - EF_REG0), (char *)(regp + regi)); |
| 113 | |
| 114 | supply_32bit_reg (LO_REGNUM, (char *)(regp + EF_LO)); |
| 115 | supply_32bit_reg (HI_REGNUM, (char *)(regp + EF_HI)); |
| 116 | |
| 117 | supply_32bit_reg (PC_REGNUM, (char *)(regp + EF_CP0_EPC)); |
| 118 | supply_32bit_reg (BADVADDR_REGNUM, (char *)(regp + EF_CP0_BADVADDR)); |
| 119 | supply_32bit_reg (PS_REGNUM, (char *)(regp + EF_CP0_STATUS)); |
| 120 | supply_32bit_reg (CAUSE_REGNUM, (char *)(regp + EF_CP0_CAUSE)); |
| 121 | |
| 122 | /* Fill inaccessible registers with zero. */ |
| 123 | supply_register (UNUSED_REGNUM, zerobuf); |
| 124 | for (regi = FIRST_EMBED_REGNUM; regi < LAST_EMBED_REGNUM; regi++) |
| 125 | supply_register (regi, zerobuf); |
| 126 | } |
| 127 | |
| 128 | /* Pack our registers (or one register) into an elf_gregset_t. */ |
| 129 | |
| 130 | void |
| 131 | fill_gregset (elf_gregset_t *gregsetp, int regno) |
| 132 | { |
| 133 | int regaddr, regi; |
| 134 | elf_greg_t *regp = *gregsetp; |
| 135 | void *dst; |
| 136 | |
| 137 | if (regno == -1) |
| 138 | { |
| 139 | memset (regp, 0, sizeof (elf_gregset_t)); |
| 140 | for (regi = 0; regi < 32; regi++) |
| 141 | fill_gregset (gregsetp, regi); |
| 142 | fill_gregset (gregsetp, LO_REGNUM); |
| 143 | fill_gregset (gregsetp, HI_REGNUM); |
| 144 | fill_gregset (gregsetp, PC_REGNUM); |
| 145 | fill_gregset (gregsetp, BADVADDR_REGNUM); |
| 146 | fill_gregset (gregsetp, PS_REGNUM); |
| 147 | fill_gregset (gregsetp, CAUSE_REGNUM); |
| 148 | |
| 149 | return; |
| 150 | } |
| 151 | |
| 152 | if (regno < 32) |
| 153 | { |
| 154 | dst = regp + regno + EF_REG0; |
| 155 | regcache_collect (regno, dst); |
| 156 | return; |
| 157 | } |
| 158 | |
| 159 | regaddr = -1; |
| 160 | switch (regno) |
| 161 | { |
| 162 | case LO_REGNUM: |
| 163 | regaddr = EF_LO; |
| 164 | break; |
| 165 | case HI_REGNUM: |
| 166 | regaddr = EF_HI; |
| 167 | break; |
| 168 | case PC_REGNUM: |
| 169 | regaddr = EF_CP0_EPC; |
| 170 | break; |
| 171 | case BADVADDR_REGNUM: |
| 172 | regaddr = EF_CP0_BADVADDR; |
| 173 | break; |
| 174 | case PS_REGNUM: |
| 175 | regaddr = EF_CP0_STATUS; |
| 176 | break; |
| 177 | case CAUSE_REGNUM: |
| 178 | regaddr = EF_CP0_CAUSE; |
| 179 | break; |
| 180 | } |
| 181 | |
| 182 | if (regaddr != -1) |
| 183 | { |
| 184 | dst = regp + regaddr; |
| 185 | regcache_collect (regno, dst); |
| 186 | } |
| 187 | } |
| 188 | |
| 189 | /* Likewise, unpack an elf_fpregset_t. */ |
| 190 | |
| 191 | void |
| 192 | supply_fpregset (elf_fpregset_t *fpregsetp) |
| 193 | { |
| 194 | register int regi; |
| 195 | char zerobuf[MAX_REGISTER_SIZE]; |
| 196 | |
| 197 | memset (zerobuf, 0, MAX_REGISTER_SIZE); |
| 198 | |
| 199 | for (regi = 0; regi < 32; regi++) |
| 200 | supply_register (FP0_REGNUM + regi, |
| 201 | (char *)(*fpregsetp + regi)); |
| 202 | |
| 203 | supply_register (FCRCS_REGNUM, (char *)(*fpregsetp + 32)); |
| 204 | |
| 205 | /* FIXME: how can we supply FCRIR_REGNUM? The ABI doesn't tell us. */ |
| 206 | supply_register (FCRIR_REGNUM, zerobuf); |
| 207 | } |
| 208 | |
| 209 | /* Likewise, pack one or all floating point registers into an |
| 210 | elf_fpregset_t. */ |
| 211 | |
| 212 | void |
| 213 | fill_fpregset (elf_fpregset_t *fpregsetp, int regno) |
| 214 | { |
| 215 | char *from, *to; |
| 216 | |
| 217 | if ((regno >= FP0_REGNUM) && (regno < FP0_REGNUM + 32)) |
| 218 | { |
| 219 | from = (char *) &deprecated_registers[REGISTER_BYTE (regno)]; |
| 220 | to = (char *) (*fpregsetp + regno - FP0_REGNUM); |
| 221 | memcpy (to, from, REGISTER_RAW_SIZE (regno - FP0_REGNUM)); |
| 222 | } |
| 223 | else if (regno == FCRCS_REGNUM) |
| 224 | { |
| 225 | from = (char *) &deprecated_registers[REGISTER_BYTE (regno)]; |
| 226 | to = (char *) (*fpregsetp + 32); |
| 227 | memcpy (to, from, REGISTER_RAW_SIZE (regno)); |
| 228 | } |
| 229 | else if (regno == -1) |
| 230 | { |
| 231 | int regi; |
| 232 | |
| 233 | for (regi = 0; regi < 32; regi++) |
| 234 | fill_fpregset (fpregsetp, FP0_REGNUM + regi); |
| 235 | fill_fpregset(fpregsetp, FCRCS_REGNUM); |
| 236 | } |
| 237 | } |
| 238 | |
| 239 | /* Map gdb internal register number to ptrace ``address''. |
| 240 | These ``addresses'' are normally defined in <asm/ptrace.h>. */ |
| 241 | |
| 242 | static CORE_ADDR |
| 243 | mips_linux_register_addr (int regno, CORE_ADDR blockend) |
| 244 | { |
| 245 | int regaddr; |
| 246 | |
| 247 | if (regno < 0 || regno >= NUM_REGS) |
| 248 | error ("Bogon register number %d.", regno); |
| 249 | |
| 250 | if (regno < 32) |
| 251 | regaddr = regno; |
| 252 | else if ((regno >= FP0_REGNUM) && (regno < FP0_REGNUM + 32)) |
| 253 | regaddr = FPR_BASE + (regno - FP0_REGNUM); |
| 254 | else if (regno == PC_REGNUM) |
| 255 | regaddr = PC; |
| 256 | else if (regno == CAUSE_REGNUM) |
| 257 | regaddr = CAUSE; |
| 258 | else if (regno == BADVADDR_REGNUM) |
| 259 | regaddr = BADVADDR; |
| 260 | else if (regno == LO_REGNUM) |
| 261 | regaddr = MMLO; |
| 262 | else if (regno == HI_REGNUM) |
| 263 | regaddr = MMHI; |
| 264 | else if (regno == FCRCS_REGNUM) |
| 265 | regaddr = FPC_CSR; |
| 266 | else if (regno == FCRIR_REGNUM) |
| 267 | regaddr = FPC_EIR; |
| 268 | else |
| 269 | error ("Unknowable register number %d.", regno); |
| 270 | |
| 271 | return regaddr; |
| 272 | } |
| 273 | |
| 274 | |
| 275 | /* Fetch (and possibly build) an appropriate link_map_offsets |
| 276 | structure for native GNU/Linux MIPS targets using the struct offsets |
| 277 | defined in link.h (but without actual reference to that file). |
| 278 | |
| 279 | This makes it possible to access GNU/Linux MIPS shared libraries from a |
| 280 | GDB that was built on a different host platform (for cross debugging). */ |
| 281 | |
| 282 | static struct link_map_offsets * |
| 283 | mips_linux_svr4_fetch_link_map_offsets (void) |
| 284 | { |
| 285 | static struct link_map_offsets lmo; |
| 286 | static struct link_map_offsets *lmp = NULL; |
| 287 | |
| 288 | if (lmp == NULL) |
| 289 | { |
| 290 | lmp = &lmo; |
| 291 | |
| 292 | lmo.r_debug_size = 8; /* The actual size is 20 bytes, but |
| 293 | this is all we need. */ |
| 294 | lmo.r_map_offset = 4; |
| 295 | lmo.r_map_size = 4; |
| 296 | |
| 297 | lmo.link_map_size = 20; |
| 298 | |
| 299 | lmo.l_addr_offset = 0; |
| 300 | lmo.l_addr_size = 4; |
| 301 | |
| 302 | lmo.l_name_offset = 4; |
| 303 | lmo.l_name_size = 4; |
| 304 | |
| 305 | lmo.l_next_offset = 12; |
| 306 | lmo.l_next_size = 4; |
| 307 | |
| 308 | lmo.l_prev_offset = 16; |
| 309 | lmo.l_prev_size = 4; |
| 310 | } |
| 311 | |
| 312 | return lmp; |
| 313 | } |
| 314 | |
| 315 | /* Support for 64-bit ABIs. */ |
| 316 | |
| 317 | /* Copied from <asm/elf.h>. */ |
| 318 | #define MIPS64_ELF_NGREG 45 |
| 319 | #define MIPS64_ELF_NFPREG 33 |
| 320 | |
| 321 | typedef unsigned char mips64_elf_greg_t[8]; |
| 322 | typedef mips64_elf_greg_t mips64_elf_gregset_t[MIPS64_ELF_NGREG]; |
| 323 | |
| 324 | typedef unsigned char mips64_elf_fpreg_t[8]; |
| 325 | typedef mips64_elf_fpreg_t mips64_elf_fpregset_t[MIPS64_ELF_NFPREG]; |
| 326 | |
| 327 | /* 0 - 31 are integer registers, 32 - 63 are fp registers. */ |
| 328 | #define MIPS64_FPR_BASE 32 |
| 329 | #define MIPS64_PC 64 |
| 330 | #define MIPS64_CAUSE 65 |
| 331 | #define MIPS64_BADVADDR 66 |
| 332 | #define MIPS64_MMHI 67 |
| 333 | #define MIPS64_MMLO 68 |
| 334 | #define MIPS64_FPC_CSR 69 |
| 335 | #define MIPS64_FPC_EIR 70 |
| 336 | |
| 337 | #define MIPS64_EF_REG0 0 |
| 338 | #define MIPS64_EF_REG31 31 |
| 339 | #define MIPS64_EF_LO 32 |
| 340 | #define MIPS64_EF_HI 33 |
| 341 | #define MIPS64_EF_CP0_EPC 34 |
| 342 | #define MIPS64_EF_CP0_BADVADDR 35 |
| 343 | #define MIPS64_EF_CP0_STATUS 36 |
| 344 | #define MIPS64_EF_CP0_CAUSE 37 |
| 345 | |
| 346 | #define MIPS64_EF_SIZE 304 |
| 347 | |
| 348 | /* Figure out where the longjmp will land. |
| 349 | We expect the first arg to be a pointer to the jmp_buf structure from |
| 350 | which we extract the pc (MIPS_LINUX_JB_PC) that we will land at. The pc |
| 351 | is copied into PC. This routine returns 1 on success. */ |
| 352 | |
| 353 | /* Details about jmp_buf. */ |
| 354 | |
| 355 | #define MIPS64_LINUX_JB_PC 0 |
| 356 | |
| 357 | static int |
| 358 | mips64_linux_get_longjmp_target (CORE_ADDR *pc) |
| 359 | { |
| 360 | CORE_ADDR jb_addr; |
| 361 | void *buf = alloca (TARGET_PTR_BIT / TARGET_CHAR_BIT); |
| 362 | int element_size = TARGET_PTR_BIT == 32 ? 4 : 8; |
| 363 | |
| 364 | jb_addr = read_register (A0_REGNUM); |
| 365 | |
| 366 | if (target_read_memory (jb_addr + MIPS64_LINUX_JB_PC * element_size, |
| 367 | buf, TARGET_PTR_BIT / TARGET_CHAR_BIT)) |
| 368 | return 0; |
| 369 | |
| 370 | *pc = extract_unsigned_integer (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT); |
| 371 | |
| 372 | return 1; |
| 373 | } |
| 374 | |
| 375 | /* Unpack an elf_gregset_t into GDB's register cache. */ |
| 376 | |
| 377 | static void |
| 378 | mips64_supply_gregset (mips64_elf_gregset_t *gregsetp) |
| 379 | { |
| 380 | int regi; |
| 381 | mips64_elf_greg_t *regp = *gregsetp; |
| 382 | char zerobuf[MAX_REGISTER_SIZE]; |
| 383 | |
| 384 | memset (zerobuf, 0, MAX_REGISTER_SIZE); |
| 385 | |
| 386 | for (regi = MIPS64_EF_REG0; regi <= MIPS64_EF_REG31; regi++) |
| 387 | supply_register ((regi - MIPS64_EF_REG0), (char *)(regp + regi)); |
| 388 | |
| 389 | supply_register (LO_REGNUM, (char *)(regp + MIPS64_EF_LO)); |
| 390 | supply_register (HI_REGNUM, (char *)(regp + MIPS64_EF_HI)); |
| 391 | |
| 392 | supply_register (PC_REGNUM, (char *)(regp + MIPS64_EF_CP0_EPC)); |
| 393 | supply_register (BADVADDR_REGNUM, (char *)(regp + MIPS64_EF_CP0_BADVADDR)); |
| 394 | supply_register (PS_REGNUM, (char *)(regp + MIPS64_EF_CP0_STATUS)); |
| 395 | supply_register (CAUSE_REGNUM, (char *)(regp + MIPS64_EF_CP0_CAUSE)); |
| 396 | |
| 397 | /* Fill inaccessible registers with zero. */ |
| 398 | supply_register (UNUSED_REGNUM, zerobuf); |
| 399 | for (regi = FIRST_EMBED_REGNUM; regi < LAST_EMBED_REGNUM; regi++) |
| 400 | supply_register (regi, zerobuf); |
| 401 | } |
| 402 | |
| 403 | /* Pack our registers (or one register) into an elf_gregset_t. */ |
| 404 | |
| 405 | static void |
| 406 | mips64_fill_gregset (mips64_elf_gregset_t *gregsetp, int regno) |
| 407 | { |
| 408 | int regaddr, regi; |
| 409 | mips64_elf_greg_t *regp = *gregsetp; |
| 410 | void *src, *dst; |
| 411 | |
| 412 | if (regno == -1) |
| 413 | { |
| 414 | memset (regp, 0, sizeof (mips64_elf_gregset_t)); |
| 415 | for (regi = 0; regi < 32; regi++) |
| 416 | mips64_fill_gregset (gregsetp, regi); |
| 417 | mips64_fill_gregset (gregsetp, LO_REGNUM); |
| 418 | mips64_fill_gregset (gregsetp, HI_REGNUM); |
| 419 | mips64_fill_gregset (gregsetp, PC_REGNUM); |
| 420 | mips64_fill_gregset (gregsetp, BADVADDR_REGNUM); |
| 421 | mips64_fill_gregset (gregsetp, PS_REGNUM); |
| 422 | mips64_fill_gregset (gregsetp, CAUSE_REGNUM); |
| 423 | |
| 424 | return; |
| 425 | } |
| 426 | |
| 427 | if (regno < 32) |
| 428 | { |
| 429 | dst = regp + regno + MIPS64_EF_REG0; |
| 430 | regcache_collect (regno, dst); |
| 431 | return; |
| 432 | } |
| 433 | |
| 434 | regaddr = -1; |
| 435 | switch (regno) |
| 436 | { |
| 437 | case LO_REGNUM: |
| 438 | regaddr = MIPS64_EF_LO; |
| 439 | break; |
| 440 | case HI_REGNUM: |
| 441 | regaddr = MIPS64_EF_HI; |
| 442 | break; |
| 443 | case PC_REGNUM: |
| 444 | regaddr = MIPS64_EF_CP0_EPC; |
| 445 | break; |
| 446 | case BADVADDR_REGNUM: |
| 447 | regaddr = MIPS64_EF_CP0_BADVADDR; |
| 448 | break; |
| 449 | case PS_REGNUM: |
| 450 | regaddr = MIPS64_EF_CP0_STATUS; |
| 451 | break; |
| 452 | case CAUSE_REGNUM: |
| 453 | regaddr = MIPS64_EF_CP0_CAUSE; |
| 454 | break; |
| 455 | } |
| 456 | |
| 457 | if (regaddr != -1) |
| 458 | { |
| 459 | dst = regp + regaddr; |
| 460 | regcache_collect (regno, dst); |
| 461 | } |
| 462 | } |
| 463 | |
| 464 | /* Likewise, unpack an elf_fpregset_t. */ |
| 465 | |
| 466 | static void |
| 467 | mips64_supply_fpregset (mips64_elf_fpregset_t *fpregsetp) |
| 468 | { |
| 469 | register int regi; |
| 470 | char zerobuf[MAX_REGISTER_SIZE]; |
| 471 | |
| 472 | memset (zerobuf, 0, MAX_REGISTER_SIZE); |
| 473 | |
| 474 | for (regi = 0; regi < 32; regi++) |
| 475 | supply_register (FP0_REGNUM + regi, |
| 476 | (char *)(*fpregsetp + regi)); |
| 477 | |
| 478 | supply_register (FCRCS_REGNUM, (char *)(*fpregsetp + 32)); |
| 479 | |
| 480 | /* FIXME: how can we supply FCRIR_REGNUM? The ABI doesn't tell us. */ |
| 481 | supply_register (FCRIR_REGNUM, zerobuf); |
| 482 | } |
| 483 | |
| 484 | /* Likewise, pack one or all floating point registers into an |
| 485 | elf_fpregset_t. */ |
| 486 | |
| 487 | static void |
| 488 | mips64_fill_fpregset (mips64_elf_fpregset_t *fpregsetp, int regno) |
| 489 | { |
| 490 | char *from, *to; |
| 491 | |
| 492 | if ((regno >= FP0_REGNUM) && (regno < FP0_REGNUM + 32)) |
| 493 | { |
| 494 | from = (char *) &deprecated_registers[REGISTER_BYTE (regno)]; |
| 495 | to = (char *) (*fpregsetp + regno - FP0_REGNUM); |
| 496 | memcpy (to, from, REGISTER_RAW_SIZE (regno - FP0_REGNUM)); |
| 497 | } |
| 498 | else if (regno == FCRCS_REGNUM) |
| 499 | { |
| 500 | from = (char *) &deprecated_registers[REGISTER_BYTE (regno)]; |
| 501 | to = (char *) (*fpregsetp + 32); |
| 502 | memcpy (to, from, REGISTER_RAW_SIZE (regno)); |
| 503 | } |
| 504 | else if (regno == -1) |
| 505 | { |
| 506 | int regi; |
| 507 | |
| 508 | for (regi = 0; regi < 32; regi++) |
| 509 | mips64_fill_fpregset (fpregsetp, FP0_REGNUM + regi); |
| 510 | mips64_fill_fpregset(fpregsetp, FCRCS_REGNUM); |
| 511 | } |
| 512 | } |
| 513 | |
| 514 | |
| 515 | /* Map gdb internal register number to ptrace ``address''. |
| 516 | These ``addresses'' are normally defined in <asm/ptrace.h>. */ |
| 517 | |
| 518 | static CORE_ADDR |
| 519 | mips64_linux_register_addr (int regno, CORE_ADDR blockend) |
| 520 | { |
| 521 | int regaddr; |
| 522 | |
| 523 | if (regno < 0 || regno >= NUM_REGS) |
| 524 | error ("Bogon register number %d.", regno); |
| 525 | |
| 526 | if (regno < 32) |
| 527 | regaddr = regno; |
| 528 | else if ((regno >= FP0_REGNUM) && (regno < FP0_REGNUM + 32)) |
| 529 | regaddr = MIPS64_FPR_BASE + (regno - FP0_REGNUM); |
| 530 | else if (regno == PC_REGNUM) |
| 531 | regaddr = MIPS64_PC; |
| 532 | else if (regno == CAUSE_REGNUM) |
| 533 | regaddr = MIPS64_CAUSE; |
| 534 | else if (regno == BADVADDR_REGNUM) |
| 535 | regaddr = MIPS64_BADVADDR; |
| 536 | else if (regno == LO_REGNUM) |
| 537 | regaddr = MIPS64_MMLO; |
| 538 | else if (regno == HI_REGNUM) |
| 539 | regaddr = MIPS64_MMHI; |
| 540 | else if (regno == FCRCS_REGNUM) |
| 541 | regaddr = MIPS64_FPC_CSR; |
| 542 | else if (regno == FCRIR_REGNUM) |
| 543 | regaddr = MIPS64_FPC_EIR; |
| 544 | else |
| 545 | error ("Unknowable register number %d.", regno); |
| 546 | |
| 547 | return regaddr; |
| 548 | } |
| 549 | |
| 550 | /* Use a local version of this function to get the correct types for |
| 551 | regsets, until multi-arch core support is ready. */ |
| 552 | |
| 553 | static void |
| 554 | fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, |
| 555 | int which, CORE_ADDR reg_addr) |
| 556 | { |
| 557 | elf_gregset_t gregset; |
| 558 | elf_fpregset_t fpregset; |
| 559 | mips64_elf_gregset_t gregset64; |
| 560 | mips64_elf_fpregset_t fpregset64; |
| 561 | |
| 562 | if (which == 0) |
| 563 | { |
| 564 | if (core_reg_size == sizeof (gregset)) |
| 565 | { |
| 566 | memcpy ((char *) &gregset, core_reg_sect, sizeof (gregset)); |
| 567 | supply_gregset (&gregset); |
| 568 | } |
| 569 | else if (core_reg_size == sizeof (gregset64)) |
| 570 | { |
| 571 | memcpy ((char *) &gregset64, core_reg_sect, sizeof (gregset64)); |
| 572 | mips64_supply_gregset (&gregset64); |
| 573 | } |
| 574 | else |
| 575 | { |
| 576 | warning ("wrong size gregset struct in core file"); |
| 577 | } |
| 578 | } |
| 579 | else if (which == 2) |
| 580 | { |
| 581 | if (core_reg_size == sizeof (fpregset)) |
| 582 | { |
| 583 | memcpy ((char *) &fpregset, core_reg_sect, sizeof (fpregset)); |
| 584 | supply_fpregset (&fpregset); |
| 585 | } |
| 586 | else if (core_reg_size == sizeof (fpregset64)) |
| 587 | { |
| 588 | memcpy ((char *) &fpregset64, core_reg_sect, sizeof (fpregset64)); |
| 589 | mips64_supply_fpregset (&fpregset64); |
| 590 | } |
| 591 | else |
| 592 | { |
| 593 | warning ("wrong size fpregset struct in core file"); |
| 594 | } |
| 595 | } |
| 596 | } |
| 597 | |
| 598 | /* Register that we are able to handle ELF file formats using standard |
| 599 | procfs "regset" structures. */ |
| 600 | |
| 601 | static struct core_fns regset_core_fns = |
| 602 | { |
| 603 | bfd_target_elf_flavour, /* core_flavour */ |
| 604 | default_check_format, /* check_format */ |
| 605 | default_core_sniffer, /* core_sniffer */ |
| 606 | fetch_core_registers, /* core_read_registers */ |
| 607 | NULL /* next */ |
| 608 | }; |
| 609 | |
| 610 | /* Fetch (and possibly build) an appropriate link_map_offsets |
| 611 | structure for native GNU/Linux MIPS targets using the struct offsets |
| 612 | defined in link.h (but without actual reference to that file). |
| 613 | |
| 614 | This makes it possible to access GNU/Linux MIPS shared libraries from a |
| 615 | GDB that was built on a different host platform (for cross debugging). */ |
| 616 | |
| 617 | static struct link_map_offsets * |
| 618 | mips64_linux_svr4_fetch_link_map_offsets (void) |
| 619 | { |
| 620 | static struct link_map_offsets lmo; |
| 621 | static struct link_map_offsets *lmp = NULL; |
| 622 | |
| 623 | if (lmp == NULL) |
| 624 | { |
| 625 | lmp = &lmo; |
| 626 | |
| 627 | lmo.r_debug_size = 16; /* The actual size is 40 bytes, but |
| 628 | this is all we need. */ |
| 629 | lmo.r_map_offset = 8; |
| 630 | lmo.r_map_size = 8; |
| 631 | |
| 632 | lmo.link_map_size = 40; |
| 633 | |
| 634 | lmo.l_addr_offset = 0; |
| 635 | lmo.l_addr_size = 8; |
| 636 | |
| 637 | lmo.l_name_offset = 8; |
| 638 | lmo.l_name_size = 8; |
| 639 | |
| 640 | lmo.l_next_offset = 24; |
| 641 | lmo.l_next_size = 8; |
| 642 | |
| 643 | lmo.l_prev_offset = 32; |
| 644 | lmo.l_prev_size = 8; |
| 645 | } |
| 646 | |
| 647 | return lmp; |
| 648 | } |
| 649 | |
| 650 | /* Handle for obtaining pointer to the current register_addr() function |
| 651 | for a given architecture. */ |
| 652 | static struct gdbarch_data *register_addr_data; |
| 653 | |
| 654 | CORE_ADDR |
| 655 | register_addr (int regno, CORE_ADDR blockend) |
| 656 | { |
| 657 | CORE_ADDR (*register_addr_ptr) (int, CORE_ADDR) = |
| 658 | gdbarch_data (current_gdbarch, register_addr_data); |
| 659 | |
| 660 | gdb_assert (register_addr_ptr != 0); |
| 661 | |
| 662 | return register_addr_ptr (regno, blockend); |
| 663 | } |
| 664 | |
| 665 | static void |
| 666 | set_mips_linux_register_addr (struct gdbarch *gdbarch, |
| 667 | CORE_ADDR (*register_addr_ptr) (int, CORE_ADDR)) |
| 668 | { |
| 669 | set_gdbarch_data (gdbarch, register_addr_data, register_addr_ptr); |
| 670 | } |
| 671 | |
| 672 | static void * |
| 673 | init_register_addr_data (struct gdbarch *gdbarch) |
| 674 | { |
| 675 | return 0; |
| 676 | } |
| 677 | |
| 678 | static void |
| 679 | mips_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| 680 | { |
| 681 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 682 | enum mips_abi abi = mips_abi (gdbarch); |
| 683 | |
| 684 | switch (abi) |
| 685 | { |
| 686 | case MIPS_ABI_O32: |
| 687 | set_gdbarch_get_longjmp_target (gdbarch, |
| 688 | mips_linux_get_longjmp_target); |
| 689 | set_solib_svr4_fetch_link_map_offsets |
| 690 | (gdbarch, mips_linux_svr4_fetch_link_map_offsets); |
| 691 | set_mips_linux_register_addr (gdbarch, mips_linux_register_addr); |
| 692 | break; |
| 693 | case MIPS_ABI_N32: |
| 694 | set_gdbarch_get_longjmp_target (gdbarch, |
| 695 | mips_linux_get_longjmp_target); |
| 696 | set_solib_svr4_fetch_link_map_offsets |
| 697 | (gdbarch, mips_linux_svr4_fetch_link_map_offsets); |
| 698 | set_mips_linux_register_addr (gdbarch, mips64_linux_register_addr); |
| 699 | break; |
| 700 | case MIPS_ABI_N64: |
| 701 | set_gdbarch_get_longjmp_target (gdbarch, |
| 702 | mips64_linux_get_longjmp_target); |
| 703 | set_solib_svr4_fetch_link_map_offsets |
| 704 | (gdbarch, mips64_linux_svr4_fetch_link_map_offsets); |
| 705 | set_mips_linux_register_addr (gdbarch, mips64_linux_register_addr); |
| 706 | break; |
| 707 | default: |
| 708 | internal_error (__FILE__, __LINE__, "can't handle ABI"); |
| 709 | break; |
| 710 | } |
| 711 | } |
| 712 | |
| 713 | void |
| 714 | _initialize_mips_linux_tdep (void) |
| 715 | { |
| 716 | const struct bfd_arch_info *arch_info; |
| 717 | |
| 718 | register_addr_data = |
| 719 | register_gdbarch_data (init_register_addr_data, 0); |
| 720 | |
| 721 | for (arch_info = bfd_lookup_arch (bfd_arch_mips, 0); |
| 722 | arch_info != NULL; |
| 723 | arch_info = arch_info->next) |
| 724 | { |
| 725 | gdbarch_register_osabi (bfd_arch_mips, arch_info->mach, GDB_OSABI_LINUX, |
| 726 | mips_linux_init_abi); |
| 727 | } |
| 728 | |
| 729 | add_core_fns (®set_core_fns); |
| 730 | } |