| 1 | /* Native-dependent code for LynxOS. |
| 2 | Copyright 1993, 1994 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of GDB. |
| 5 | |
| 6 | This program is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 2 of the License, or |
| 9 | (at your option) any later version. |
| 10 | |
| 11 | This program is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| 19 | |
| 20 | #include "defs.h" |
| 21 | #include "frame.h" |
| 22 | #include "inferior.h" |
| 23 | #include "target.h" |
| 24 | #include "gdbcore.h" |
| 25 | |
| 26 | #include <sys/ptrace.h> |
| 27 | #include <sys/wait.h> |
| 28 | #include <sys/fpp.h> |
| 29 | |
| 30 | static unsigned long registers_addr PARAMS ((int pid)); |
| 31 | static void fetch_core_registers PARAMS ((char *, unsigned, int, CORE_ADDR); |
| 32 | |
| 33 | #define X(ENTRY)(offsetof(struct econtext, ENTRY)) |
| 34 | |
| 35 | #ifdef I386 |
| 36 | /* Mappings from tm-i386v.h */ |
| 37 | |
| 38 | static int regmap[] = |
| 39 | { |
| 40 | X(eax), |
| 41 | X(ecx), |
| 42 | X(edx), |
| 43 | X(ebx), |
| 44 | X(esp), /* sp */ |
| 45 | X(ebp), /* fp */ |
| 46 | X(esi), |
| 47 | X(edi), |
| 48 | X(eip), /* pc */ |
| 49 | X(flags), /* ps */ |
| 50 | X(cs), |
| 51 | X(ss), |
| 52 | X(ds), |
| 53 | X(es), |
| 54 | X(ecode), /* Lynx doesn't give us either fs or gs, so */ |
| 55 | X(fault), /* we just substitute these two in the hopes |
| 56 | that they are useful. */ |
| 57 | }; |
| 58 | #endif /* I386 */ |
| 59 | |
| 60 | #ifdef M68K |
| 61 | /* Mappings from tm-m68k.h */ |
| 62 | |
| 63 | static int regmap[] = |
| 64 | { |
| 65 | X(regs[0]), /* d0 */ |
| 66 | X(regs[1]), /* d1 */ |
| 67 | X(regs[2]), /* d2 */ |
| 68 | X(regs[3]), /* d3 */ |
| 69 | X(regs[4]), /* d4 */ |
| 70 | X(regs[5]), /* d5 */ |
| 71 | X(regs[6]), /* d6 */ |
| 72 | X(regs[7]), /* d7 */ |
| 73 | X(regs[8]), /* a0 */ |
| 74 | X(regs[9]), /* a1 */ |
| 75 | X(regs[10]), /* a2 */ |
| 76 | X(regs[11]), /* a3 */ |
| 77 | X(regs[12]), /* a4 */ |
| 78 | X(regs[13]), /* a5 */ |
| 79 | X(regs[14]), /* fp */ |
| 80 | offsetof (st_t, usp) - offsetof (st_t, ec), /* sp */ |
| 81 | X(status), /* ps */ |
| 82 | X(pc), |
| 83 | |
| 84 | X(fregs[0*3]), /* fp0 */ |
| 85 | X(fregs[1*3]), /* fp1 */ |
| 86 | X(fregs[2*3]), /* fp2 */ |
| 87 | X(fregs[3*3]), /* fp3 */ |
| 88 | X(fregs[4*3]), /* fp4 */ |
| 89 | X(fregs[5*3]), /* fp5 */ |
| 90 | X(fregs[6*3]), /* fp6 */ |
| 91 | X(fregs[7*3]), /* fp7 */ |
| 92 | |
| 93 | X(fcregs[0]), /* fpcontrol */ |
| 94 | X(fcregs[1]), /* fpstatus */ |
| 95 | X(fcregs[2]), /* fpiaddr */ |
| 96 | X(ssw), /* fpcode */ |
| 97 | X(fault), /* fpflags */ |
| 98 | }; |
| 99 | #endif /* M68K */ |
| 100 | |
| 101 | #ifdef SPARC |
| 102 | /* Mappings from tm-sparc.h */ |
| 103 | |
| 104 | #define FX(ENTRY)(offsetof(struct fcontext, ENTRY)) |
| 105 | |
| 106 | static int regmap[] = |
| 107 | { |
| 108 | -1, /* g0 */ |
| 109 | X(g1), |
| 110 | X(g2), |
| 111 | X(g3), |
| 112 | X(g4), |
| 113 | -1, /* g5->g7 aren't saved by Lynx */ |
| 114 | -1, |
| 115 | -1, |
| 116 | |
| 117 | X(o[0]), |
| 118 | X(o[1]), |
| 119 | X(o[2]), |
| 120 | X(o[3]), |
| 121 | X(o[4]), |
| 122 | X(o[5]), |
| 123 | X(o[6]), /* sp */ |
| 124 | X(o[7]), /* ra */ |
| 125 | |
| 126 | -1,-1,-1,-1,-1,-1,-1,-1, /* l0 -> l7 */ |
| 127 | |
| 128 | -1,-1,-1,-1,-1,-1,-1,-1, /* i0 -> i7 */ |
| 129 | |
| 130 | FX(f.fregs[0]), /* f0 */ |
| 131 | FX(f.fregs[1]), |
| 132 | FX(f.fregs[2]), |
| 133 | FX(f.fregs[3]), |
| 134 | FX(f.fregs[4]), |
| 135 | FX(f.fregs[5]), |
| 136 | FX(f.fregs[6]), |
| 137 | FX(f.fregs[7]), |
| 138 | FX(f.fregs[8]), |
| 139 | FX(f.fregs[9]), |
| 140 | FX(f.fregs[10]), |
| 141 | FX(f.fregs[11]), |
| 142 | FX(f.fregs[12]), |
| 143 | FX(f.fregs[13]), |
| 144 | FX(f.fregs[14]), |
| 145 | FX(f.fregs[15]), |
| 146 | FX(f.fregs[16]), |
| 147 | FX(f.fregs[17]), |
| 148 | FX(f.fregs[18]), |
| 149 | FX(f.fregs[19]), |
| 150 | FX(f.fregs[20]), |
| 151 | FX(f.fregs[21]), |
| 152 | FX(f.fregs[22]), |
| 153 | FX(f.fregs[23]), |
| 154 | FX(f.fregs[24]), |
| 155 | FX(f.fregs[25]), |
| 156 | FX(f.fregs[26]), |
| 157 | FX(f.fregs[27]), |
| 158 | FX(f.fregs[28]), |
| 159 | FX(f.fregs[29]), |
| 160 | FX(f.fregs[30]), |
| 161 | FX(f.fregs[31]), |
| 162 | |
| 163 | X(y), |
| 164 | X(psr), |
| 165 | X(wim), |
| 166 | X(tbr), |
| 167 | X(pc), |
| 168 | X(npc), |
| 169 | FX(fsr), /* fpsr */ |
| 170 | -1, /* cpsr */ |
| 171 | }; |
| 172 | #endif /* SPARC */ |
| 173 | |
| 174 | #ifdef rs6000 |
| 175 | |
| 176 | static int regmap[] = |
| 177 | { |
| 178 | X(iregs[0]), /* r0 */ |
| 179 | X(iregs[1]), |
| 180 | X(iregs[2]), |
| 181 | X(iregs[3]), |
| 182 | X(iregs[4]), |
| 183 | X(iregs[5]), |
| 184 | X(iregs[6]), |
| 185 | X(iregs[7]), |
| 186 | X(iregs[8]), |
| 187 | X(iregs[9]), |
| 188 | X(iregs[10]), |
| 189 | X(iregs[11]), |
| 190 | X(iregs[12]), |
| 191 | X(iregs[13]), |
| 192 | X(iregs[14]), |
| 193 | X(iregs[15]), |
| 194 | X(iregs[16]), |
| 195 | X(iregs[17]), |
| 196 | X(iregs[18]), |
| 197 | X(iregs[19]), |
| 198 | X(iregs[20]), |
| 199 | X(iregs[21]), |
| 200 | X(iregs[22]), |
| 201 | X(iregs[23]), |
| 202 | X(iregs[24]), |
| 203 | X(iregs[25]), |
| 204 | X(iregs[26]), |
| 205 | X(iregs[27]), |
| 206 | X(iregs[28]), |
| 207 | X(iregs[29]), |
| 208 | X(iregs[30]), |
| 209 | X(iregs[31]), |
| 210 | |
| 211 | X(fregs[0]), /* f0 */ |
| 212 | X(fregs[1]), |
| 213 | X(fregs[2]), |
| 214 | X(fregs[3]), |
| 215 | X(fregs[4]), |
| 216 | X(fregs[5]), |
| 217 | X(fregs[6]), |
| 218 | X(fregs[7]), |
| 219 | X(fregs[8]), |
| 220 | X(fregs[9]), |
| 221 | X(fregs[10]), |
| 222 | X(fregs[11]), |
| 223 | X(fregs[12]), |
| 224 | X(fregs[13]), |
| 225 | X(fregs[14]), |
| 226 | X(fregs[15]), |
| 227 | X(fregs[16]), |
| 228 | X(fregs[17]), |
| 229 | X(fregs[18]), |
| 230 | X(fregs[19]), |
| 231 | X(fregs[20]), |
| 232 | X(fregs[21]), |
| 233 | X(fregs[22]), |
| 234 | X(fregs[23]), |
| 235 | X(fregs[24]), |
| 236 | X(fregs[25]), |
| 237 | X(fregs[26]), |
| 238 | X(fregs[27]), |
| 239 | X(fregs[28]), |
| 240 | X(fregs[29]), |
| 241 | X(fregs[30]), |
| 242 | X(fregs[31]), |
| 243 | |
| 244 | X(srr0), /* IAR (PC) */ |
| 245 | X(srr1), /* MSR (PS) */ |
| 246 | X(cr), /* CR */ |
| 247 | X(lr), /* LR */ |
| 248 | X(ctr), /* CTR */ |
| 249 | X(xer), /* XER */ |
| 250 | X(mq) /* MQ */ |
| 251 | }; |
| 252 | |
| 253 | #endif /* rs6000 */ |
| 254 | |
| 255 | #ifdef SPARC |
| 256 | |
| 257 | /* This routine handles some oddball cases for Sparc registers and LynxOS. |
| 258 | In partucular, it causes refs to G0, g5->7, and all fp regs to return zero. |
| 259 | It also handles knows where to find the I & L regs on the stack. */ |
| 260 | |
| 261 | void |
| 262 | fetch_inferior_registers (regno) |
| 263 | int regno; |
| 264 | { |
| 265 | int whatregs = 0; |
| 266 | |
| 267 | #define WHATREGS_FLOAT 1 |
| 268 | #define WHATREGS_GEN 2 |
| 269 | #define WHATREGS_STACK 4 |
| 270 | |
| 271 | if (regno == -1) |
| 272 | whatregs = WHATREGS_FLOAT | WHATREGS_GEN | WHATREGS_STACK; |
| 273 | else if (regno >= L0_REGNUM && regno <= I7_REGNUM) |
| 274 | whatregs = WHATREGS_STACK; |
| 275 | else if (regno >= FP0_REGNUM && regno < FP0_REGNUM + 32) |
| 276 | whatregs = WHATREGS_FLOAT; |
| 277 | else |
| 278 | whatregs = WHATREGS_GEN; |
| 279 | |
| 280 | if (whatregs & WHATREGS_GEN) |
| 281 | { |
| 282 | struct econtext ec; /* general regs */ |
| 283 | char buf[MAX_REGISTER_RAW_SIZE]; |
| 284 | int retval; |
| 285 | int i; |
| 286 | |
| 287 | errno = 0; |
| 288 | retval = ptrace (PTRACE_GETREGS, inferior_pid, (PTRACE_ARG3_TYPE) &ec, |
| 289 | 0); |
| 290 | if (errno) |
| 291 | perror_with_name ("ptrace(PTRACE_GETREGS)"); |
| 292 | |
| 293 | memset (buf, 0, REGISTER_RAW_SIZE (G0_REGNUM)); |
| 294 | supply_register (G0_REGNUM, buf); |
| 295 | supply_register (TBR_REGNUM, (char *)&ec.tbr); |
| 296 | |
| 297 | memcpy (®isters[REGISTER_BYTE (G1_REGNUM)], &ec.g1, |
| 298 | 4 * REGISTER_RAW_SIZE (G1_REGNUM)); |
| 299 | for (i = G1_REGNUM; i <= G1_REGNUM + 3; i++) |
| 300 | register_valid[i] = 1; |
| 301 | |
| 302 | supply_register (PS_REGNUM, (char *)&ec.psr); |
| 303 | supply_register (Y_REGNUM, (char *)&ec.y); |
| 304 | supply_register (PC_REGNUM, (char *)&ec.pc); |
| 305 | supply_register (NPC_REGNUM, (char *)&ec.npc); |
| 306 | supply_register (WIM_REGNUM, (char *)&ec.wim); |
| 307 | |
| 308 | memcpy (®isters[REGISTER_BYTE (O0_REGNUM)], ec.o, |
| 309 | 8 * REGISTER_RAW_SIZE (O0_REGNUM)); |
| 310 | for (i = O0_REGNUM; i <= O0_REGNUM + 7; i++) |
| 311 | register_valid[i] = 1; |
| 312 | } |
| 313 | |
| 314 | if (whatregs & WHATREGS_STACK) |
| 315 | { |
| 316 | CORE_ADDR sp; |
| 317 | int i; |
| 318 | |
| 319 | sp = read_register (SP_REGNUM); |
| 320 | |
| 321 | target_xfer_memory (sp + FRAME_SAVED_I0, |
| 322 | ®isters[REGISTER_BYTE(I0_REGNUM)], |
| 323 | 8 * REGISTER_RAW_SIZE (I0_REGNUM), 0); |
| 324 | for (i = I0_REGNUM; i <= I7_REGNUM; i++) |
| 325 | register_valid[i] = 1; |
| 326 | |
| 327 | target_xfer_memory (sp + FRAME_SAVED_L0, |
| 328 | ®isters[REGISTER_BYTE(L0_REGNUM)], |
| 329 | 8 * REGISTER_RAW_SIZE (L0_REGNUM), 0); |
| 330 | for (i = L0_REGNUM; i <= L0_REGNUM + 7; i++) |
| 331 | register_valid[i] = 1; |
| 332 | } |
| 333 | |
| 334 | if (whatregs & WHATREGS_FLOAT) |
| 335 | { |
| 336 | struct fcontext fc; /* fp regs */ |
| 337 | int retval; |
| 338 | int i; |
| 339 | |
| 340 | errno = 0; |
| 341 | retval = ptrace (PTRACE_GETFPREGS, inferior_pid, (PTRACE_ARG3_TYPE) &fc, |
| 342 | 0); |
| 343 | if (errno) |
| 344 | perror_with_name ("ptrace(PTRACE_GETFPREGS)"); |
| 345 | |
| 346 | memcpy (®isters[REGISTER_BYTE (FP0_REGNUM)], fc.f.fregs, |
| 347 | 32 * REGISTER_RAW_SIZE (FP0_REGNUM)); |
| 348 | for (i = FP0_REGNUM; i <= FP0_REGNUM + 31; i++) |
| 349 | register_valid[i] = 1; |
| 350 | |
| 351 | supply_register (FPS_REGNUM, (char *)&fc.fsr); |
| 352 | } |
| 353 | } |
| 354 | |
| 355 | /* This routine handles storing of the I & L regs for the Sparc. The trick |
| 356 | here is that they actually live on the stack. The really tricky part is |
| 357 | that when changing the stack pointer, the I & L regs must be written to |
| 358 | where the new SP points, otherwise the regs will be incorrect when the |
| 359 | process is started up again. We assume that the I & L regs are valid at |
| 360 | this point. */ |
| 361 | |
| 362 | void |
| 363 | store_inferior_registers (regno) |
| 364 | int regno; |
| 365 | { |
| 366 | int whatregs = 0; |
| 367 | |
| 368 | if (regno == -1) |
| 369 | whatregs = WHATREGS_FLOAT | WHATREGS_GEN | WHATREGS_STACK; |
| 370 | else if (regno >= L0_REGNUM && regno <= I7_REGNUM) |
| 371 | whatregs = WHATREGS_STACK; |
| 372 | else if (regno >= FP0_REGNUM && regno < FP0_REGNUM + 32) |
| 373 | whatregs = WHATREGS_FLOAT; |
| 374 | else if (regno == SP_REGNUM) |
| 375 | whatregs = WHATREGS_STACK | WHATREGS_GEN; |
| 376 | else |
| 377 | whatregs = WHATREGS_GEN; |
| 378 | |
| 379 | if (whatregs & WHATREGS_GEN) |
| 380 | { |
| 381 | struct econtext ec; /* general regs */ |
| 382 | int retval; |
| 383 | |
| 384 | ec.tbr = read_register (TBR_REGNUM); |
| 385 | memcpy (&ec.g1, ®isters[REGISTER_BYTE (G1_REGNUM)], |
| 386 | 4 * REGISTER_RAW_SIZE (G1_REGNUM)); |
| 387 | |
| 388 | ec.psr = read_register (PS_REGNUM); |
| 389 | ec.y = read_register (Y_REGNUM); |
| 390 | ec.pc = read_register (PC_REGNUM); |
| 391 | ec.npc = read_register (NPC_REGNUM); |
| 392 | ec.wim = read_register (WIM_REGNUM); |
| 393 | |
| 394 | memcpy (ec.o, ®isters[REGISTER_BYTE (O0_REGNUM)], |
| 395 | 8 * REGISTER_RAW_SIZE (O0_REGNUM)); |
| 396 | |
| 397 | errno = 0; |
| 398 | retval = ptrace (PTRACE_SETREGS, inferior_pid, (PTRACE_ARG3_TYPE) &ec, |
| 399 | 0); |
| 400 | if (errno) |
| 401 | perror_with_name ("ptrace(PTRACE_SETREGS)"); |
| 402 | } |
| 403 | |
| 404 | if (whatregs & WHATREGS_STACK) |
| 405 | { |
| 406 | int regoffset; |
| 407 | CORE_ADDR sp; |
| 408 | |
| 409 | sp = read_register (SP_REGNUM); |
| 410 | |
| 411 | if (regno == -1 || regno == SP_REGNUM) |
| 412 | { |
| 413 | if (!register_valid[L0_REGNUM+5]) |
| 414 | abort(); |
| 415 | target_xfer_memory (sp + FRAME_SAVED_I0, |
| 416 | ®isters[REGISTER_BYTE (I0_REGNUM)], |
| 417 | 8 * REGISTER_RAW_SIZE (I0_REGNUM), 1); |
| 418 | |
| 419 | target_xfer_memory (sp + FRAME_SAVED_L0, |
| 420 | ®isters[REGISTER_BYTE (L0_REGNUM)], |
| 421 | 8 * REGISTER_RAW_SIZE (L0_REGNUM), 1); |
| 422 | } |
| 423 | else if (regno >= L0_REGNUM && regno <= I7_REGNUM) |
| 424 | { |
| 425 | if (!register_valid[regno]) |
| 426 | abort(); |
| 427 | if (regno >= L0_REGNUM && regno <= L0_REGNUM + 7) |
| 428 | regoffset = REGISTER_BYTE (regno) - REGISTER_BYTE (L0_REGNUM) |
| 429 | + FRAME_SAVED_L0; |
| 430 | else |
| 431 | regoffset = REGISTER_BYTE (regno) - REGISTER_BYTE (I0_REGNUM) |
| 432 | + FRAME_SAVED_I0; |
| 433 | target_xfer_memory (sp + regoffset, ®isters[REGISTER_BYTE (regno)], |
| 434 | REGISTER_RAW_SIZE (regno), 1); |
| 435 | } |
| 436 | } |
| 437 | |
| 438 | if (whatregs & WHATREGS_FLOAT) |
| 439 | { |
| 440 | struct fcontext fc; /* fp regs */ |
| 441 | int retval; |
| 442 | |
| 443 | /* We read fcontext first so that we can get good values for fq_t... */ |
| 444 | errno = 0; |
| 445 | retval = ptrace (PTRACE_GETFPREGS, inferior_pid, (PTRACE_ARG3_TYPE) &fc, |
| 446 | 0); |
| 447 | if (errno) |
| 448 | perror_with_name ("ptrace(PTRACE_GETFPREGS)"); |
| 449 | |
| 450 | memcpy (fc.f.fregs, ®isters[REGISTER_BYTE (FP0_REGNUM)], |
| 451 | 32 * REGISTER_RAW_SIZE (FP0_REGNUM)); |
| 452 | |
| 453 | fc.fsr = read_register (FPS_REGNUM); |
| 454 | |
| 455 | errno = 0; |
| 456 | retval = ptrace (PTRACE_SETFPREGS, inferior_pid, (PTRACE_ARG3_TYPE) &fc, |
| 457 | 0); |
| 458 | if (errno) |
| 459 | perror_with_name ("ptrace(PTRACE_SETFPREGS)"); |
| 460 | } |
| 461 | } |
| 462 | #endif /* SPARC */ |
| 463 | |
| 464 | #if defined (I386) || defined (M68K) || defined (rs6000) |
| 465 | |
| 466 | /* Return the offset relative to the start of the per-thread data to the |
| 467 | saved context block. */ |
| 468 | |
| 469 | static unsigned long |
| 470 | registers_addr(pid) |
| 471 | int pid; |
| 472 | { |
| 473 | CORE_ADDR stblock; |
| 474 | int ecpoff = offsetof(st_t, ecp); |
| 475 | CORE_ADDR ecp; |
| 476 | |
| 477 | errno = 0; |
| 478 | stblock = (CORE_ADDR) ptrace (PTRACE_THREADUSER, pid, (PTRACE_ARG3_TYPE)0, |
| 479 | 0); |
| 480 | if (errno) |
| 481 | perror_with_name ("ptrace(PTRACE_THREADUSER)"); |
| 482 | |
| 483 | ecp = (CORE_ADDR) ptrace (PTRACE_PEEKTHREAD, pid, (PTRACE_ARG3_TYPE)ecpoff, |
| 484 | 0); |
| 485 | if (errno) |
| 486 | perror_with_name ("ptrace(PTRACE_PEEKTHREAD)"); |
| 487 | |
| 488 | return ecp - stblock; |
| 489 | } |
| 490 | |
| 491 | /* Fetch one or more registers from the inferior. REGNO == -1 to get |
| 492 | them all. We actually fetch more than requested, when convenient, |
| 493 | marking them as valid so we won't fetch them again. */ |
| 494 | |
| 495 | void |
| 496 | fetch_inferior_registers (regno) |
| 497 | int regno; |
| 498 | { |
| 499 | int reglo, reghi; |
| 500 | int i; |
| 501 | unsigned long ecp; |
| 502 | |
| 503 | if (regno == -1) |
| 504 | { |
| 505 | reglo = 0; |
| 506 | reghi = NUM_REGS - 1; |
| 507 | } |
| 508 | else |
| 509 | reglo = reghi = regno; |
| 510 | |
| 511 | ecp = registers_addr (inferior_pid); |
| 512 | |
| 513 | for (regno = reglo; regno <= reghi; regno++) |
| 514 | { |
| 515 | char buf[MAX_REGISTER_RAW_SIZE]; |
| 516 | int ptrace_fun = PTRACE_PEEKTHREAD; |
| 517 | |
| 518 | #ifdef M68K |
| 519 | ptrace_fun = regno == SP_REGNUM ? PTRACE_PEEKUSP : PTRACE_PEEKTHREAD; |
| 520 | #endif |
| 521 | |
| 522 | for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int)) |
| 523 | { |
| 524 | unsigned int reg; |
| 525 | |
| 526 | errno = 0; |
| 527 | reg = ptrace (ptrace_fun, inferior_pid, |
| 528 | (PTRACE_ARG3_TYPE) (ecp + regmap[regno] + i), 0); |
| 529 | if (errno) |
| 530 | perror_with_name ("ptrace(PTRACE_PEEKUSP)"); |
| 531 | |
| 532 | *(int *)&buf[i] = reg; |
| 533 | } |
| 534 | supply_register (regno, buf); |
| 535 | } |
| 536 | } |
| 537 | |
| 538 | /* Store our register values back into the inferior. |
| 539 | If REGNO is -1, do this for all registers. |
| 540 | Otherwise, REGNO specifies which register (so we can save time). */ |
| 541 | |
| 542 | /* Registers we shouldn't try to store. */ |
| 543 | #if !defined (CANNOT_STORE_REGISTER) |
| 544 | #define CANNOT_STORE_REGISTER(regno) 0 |
| 545 | #endif |
| 546 | |
| 547 | void |
| 548 | store_inferior_registers (regno) |
| 549 | int regno; |
| 550 | { |
| 551 | int reglo, reghi; |
| 552 | int i; |
| 553 | unsigned long ecp; |
| 554 | |
| 555 | if (regno == -1) |
| 556 | { |
| 557 | reglo = 0; |
| 558 | reghi = NUM_REGS - 1; |
| 559 | } |
| 560 | else |
| 561 | reglo = reghi = regno; |
| 562 | |
| 563 | ecp = registers_addr (inferior_pid); |
| 564 | |
| 565 | for (regno = reglo; regno <= reghi; regno++) |
| 566 | { |
| 567 | int ptrace_fun = PTRACE_POKEUSER; |
| 568 | |
| 569 | if (CANNOT_STORE_REGISTER (regno)) |
| 570 | continue; |
| 571 | |
| 572 | #ifdef M68K |
| 573 | ptrace_fun = regno == SP_REGNUM ? PTRACE_POKEUSP : PTRACE_POKEUSER; |
| 574 | #endif |
| 575 | |
| 576 | for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int)) |
| 577 | { |
| 578 | unsigned int reg; |
| 579 | |
| 580 | reg = *(unsigned int *)®isters[REGISTER_BYTE (regno) + i]; |
| 581 | |
| 582 | errno = 0; |
| 583 | ptrace (ptrace_fun, inferior_pid, |
| 584 | (PTRACE_ARG3_TYPE) (ecp + regmap[regno] + i), reg); |
| 585 | if (errno) |
| 586 | perror_with_name ("ptrace(PTRACE_POKEUSP)"); |
| 587 | } |
| 588 | } |
| 589 | } |
| 590 | #endif /* defined (I386) || defined (M68K) || defined (rs6000) */ |
| 591 | |
| 592 | /* Wait for child to do something. Return pid of child, or -1 in case |
| 593 | of error; store status through argument pointer OURSTATUS. */ |
| 594 | |
| 595 | int |
| 596 | child_wait (pid, ourstatus) |
| 597 | int pid; |
| 598 | struct target_waitstatus *ourstatus; |
| 599 | { |
| 600 | int save_errno; |
| 601 | int thread; |
| 602 | union wait status; |
| 603 | |
| 604 | while (1) |
| 605 | { |
| 606 | int sig; |
| 607 | |
| 608 | set_sigint_trap(); /* Causes SIGINT to be passed on to the |
| 609 | attached process. */ |
| 610 | pid = wait (&status); |
| 611 | |
| 612 | save_errno = errno; |
| 613 | |
| 614 | clear_sigint_trap(); |
| 615 | |
| 616 | if (pid == -1) |
| 617 | { |
| 618 | if (save_errno == EINTR) |
| 619 | continue; |
| 620 | fprintf_unfiltered (gdb_stderr, "Child process unexpectedly missing: %s.\n", |
| 621 | safe_strerror (save_errno)); |
| 622 | /* Claim it exited with unknown signal. */ |
| 623 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; |
| 624 | ourstatus->value.sig = TARGET_SIGNAL_UNKNOWN; |
| 625 | return -1; |
| 626 | } |
| 627 | |
| 628 | if (pid != PIDGET (inferior_pid)) /* Some other process?!? */ |
| 629 | continue; |
| 630 | |
| 631 | thread = status.w_tid; /* Get thread id from status */ |
| 632 | |
| 633 | /* Initial thread value can only be acquired via wait, so we have to |
| 634 | resort to this hack. */ |
| 635 | |
| 636 | if (TIDGET (inferior_pid) == 0 && thread != 0) |
| 637 | { |
| 638 | inferior_pid = BUILDPID (inferior_pid, thread); |
| 639 | add_thread (inferior_pid); |
| 640 | } |
| 641 | |
| 642 | pid = BUILDPID (pid, thread); |
| 643 | |
| 644 | /* We've become a single threaded process again. */ |
| 645 | if (thread == 0) |
| 646 | inferior_pid = pid; |
| 647 | |
| 648 | /* Check for thread creation. */ |
| 649 | if (WIFSTOPPED(status) |
| 650 | && WSTOPSIG(status) == SIGTRAP |
| 651 | && !in_thread_list (pid)) |
| 652 | { |
| 653 | int realsig; |
| 654 | |
| 655 | realsig = ptrace (PTRACE_GETTRACESIG, pid, (PTRACE_ARG3_TYPE)0, 0); |
| 656 | |
| 657 | if (realsig == SIGNEWTHREAD) |
| 658 | { |
| 659 | /* It's a new thread notification. We don't want to much with |
| 660 | realsig -- the code in wait_for_inferior expects SIGTRAP. */ |
| 661 | ourstatus->kind = TARGET_WAITKIND_SPURIOUS; |
| 662 | ourstatus->value.sig = TARGET_SIGNAL_0; |
| 663 | return pid; |
| 664 | } |
| 665 | else |
| 666 | error ("Signal for unknown thread was not SIGNEWTHREAD"); |
| 667 | } |
| 668 | |
| 669 | /* Check for thread termination. */ |
| 670 | else if (WIFSTOPPED(status) |
| 671 | && WSTOPSIG(status) == SIGTRAP |
| 672 | && in_thread_list (pid)) |
| 673 | { |
| 674 | int realsig; |
| 675 | |
| 676 | realsig = ptrace (PTRACE_GETTRACESIG, pid, (PTRACE_ARG3_TYPE)0, 0); |
| 677 | |
| 678 | if (realsig == SIGTHREADEXIT) |
| 679 | { |
| 680 | ptrace (PTRACE_CONT, PIDGET (pid), (PTRACE_ARG3_TYPE)0, 0); |
| 681 | continue; |
| 682 | } |
| 683 | } |
| 684 | |
| 685 | #ifdef SPARC |
| 686 | /* SPARC Lynx uses an byte reversed wait status; we must use the |
| 687 | host macros to access it. These lines just a copy of |
| 688 | store_waitstatus. We can't use CHILD_SPECIAL_WAITSTATUS |
| 689 | because target.c can't include the Lynx <sys/wait.h>. */ |
| 690 | if (WIFEXITED (status)) |
| 691 | { |
| 692 | ourstatus->kind = TARGET_WAITKIND_EXITED; |
| 693 | ourstatus->value.integer = WEXITSTATUS (status); |
| 694 | } |
| 695 | else if (!WIFSTOPPED (status)) |
| 696 | { |
| 697 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; |
| 698 | ourstatus->value.sig = |
| 699 | target_signal_from_host (WTERMSIG (status)); |
| 700 | } |
| 701 | else |
| 702 | { |
| 703 | ourstatus->kind = TARGET_WAITKIND_STOPPED; |
| 704 | ourstatus->value.sig = |
| 705 | target_signal_from_host (WSTOPSIG (status)); |
| 706 | } |
| 707 | #else |
| 708 | store_waitstatus (ourstatus, status.w_status); |
| 709 | #endif |
| 710 | |
| 711 | return pid; |
| 712 | } |
| 713 | } |
| 714 | |
| 715 | /* Return nonzero if the given thread is still alive. */ |
| 716 | int |
| 717 | child_thread_alive (pid) |
| 718 | int pid; |
| 719 | { |
| 720 | /* Arggh. Apparently pthread_kill only works for threads within |
| 721 | the process that calls pthread_kill. |
| 722 | |
| 723 | We want to avoid the lynx signal extensions as they simply don't |
| 724 | map well to the generic gdb interface we want to keep. |
| 725 | |
| 726 | All we want to do is determine if a particular thread is alive; |
| 727 | it appears as if we can just make a harmless thread specific |
| 728 | ptrace call to do that. */ |
| 729 | return (ptrace (PTRACE_THREADUSER, pid, 0, 0) != -1); |
| 730 | } |
| 731 | |
| 732 | /* Resume execution of the inferior process. |
| 733 | If STEP is nonzero, single-step it. |
| 734 | If SIGNAL is nonzero, give it that signal. */ |
| 735 | |
| 736 | void |
| 737 | child_resume (pid, step, signal) |
| 738 | int pid; |
| 739 | int step; |
| 740 | enum target_signal signal; |
| 741 | { |
| 742 | int func; |
| 743 | |
| 744 | errno = 0; |
| 745 | |
| 746 | /* If pid == -1, then we want to step/continue all threads, else |
| 747 | we only want to step/continue a single thread. */ |
| 748 | if (pid == -1) |
| 749 | { |
| 750 | pid = inferior_pid; |
| 751 | func = step ? PTRACE_SINGLESTEP : PTRACE_CONT; |
| 752 | } |
| 753 | else |
| 754 | func = step ? PTRACE_SINGLESTEP_ONE : PTRACE_CONT_ONE; |
| 755 | |
| 756 | |
| 757 | /* An address of (PTRACE_ARG3_TYPE)1 tells ptrace to continue from where |
| 758 | it was. (If GDB wanted it to start some other way, we have already |
| 759 | written a new PC value to the child.) |
| 760 | |
| 761 | If this system does not support PT_STEP, a higher level function will |
| 762 | have called single_step() to transmute the step request into a |
| 763 | continue request (by setting breakpoints on all possible successor |
| 764 | instructions), so we don't have to worry about that here. */ |
| 765 | |
| 766 | ptrace (func, pid, (PTRACE_ARG3_TYPE) 1, target_signal_to_host (signal)); |
| 767 | |
| 768 | if (errno) |
| 769 | perror_with_name ("ptrace"); |
| 770 | } |
| 771 | |
| 772 | /* Convert a Lynx process ID to a string. Returns the string in a static |
| 773 | buffer. */ |
| 774 | |
| 775 | char * |
| 776 | lynx_pid_to_str (pid) |
| 777 | int pid; |
| 778 | { |
| 779 | static char buf[40]; |
| 780 | |
| 781 | sprintf (buf, "process %d thread %d", PIDGET (pid), TIDGET (pid)); |
| 782 | |
| 783 | return buf; |
| 784 | } |
| 785 | |
| 786 | /* Extract the register values out of the core file and store |
| 787 | them where `read_register' will find them. |
| 788 | |
| 789 | CORE_REG_SECT points to the register values themselves, read into memory. |
| 790 | CORE_REG_SIZE is the size of that area. |
| 791 | WHICH says which set of registers we are handling (0 = int, 2 = float |
| 792 | on machines where they are discontiguous). |
| 793 | REG_ADDR is the offset from u.u_ar0 to the register values relative to |
| 794 | core_reg_sect. This is used with old-fashioned core files to |
| 795 | locate the registers in a large upage-plus-stack ".reg" section. |
| 796 | Original upage address X is at location core_reg_sect+x+reg_addr. |
| 797 | */ |
| 798 | |
| 799 | static void |
| 800 | fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr) |
| 801 | char *core_reg_sect; |
| 802 | unsigned core_reg_size; |
| 803 | int which; |
| 804 | CORE_ADDR reg_addr; |
| 805 | { |
| 806 | struct st_entry s; |
| 807 | unsigned int regno; |
| 808 | |
| 809 | for (regno = 0; regno < NUM_REGS; regno++) |
| 810 | if (regmap[regno] != -1) |
| 811 | supply_register (regno, core_reg_sect + offsetof (st_t, ec) |
| 812 | + regmap[regno]); |
| 813 | |
| 814 | #ifdef SPARC |
| 815 | /* Fetching this register causes all of the I & L regs to be read from the |
| 816 | stack and validated. */ |
| 817 | |
| 818 | fetch_inferior_registers (I0_REGNUM); |
| 819 | #endif |
| 820 | } |
| 821 | |
| 822 | \f |
| 823 | /* Register that we are able to handle lynx core file formats. |
| 824 | FIXME: is this really bfd_target_unknown_flavour? */ |
| 825 | |
| 826 | static struct core_fns lynx_core_fns = |
| 827 | { |
| 828 | bfd_target_unknown_flavour, |
| 829 | fetch_core_registers, |
| 830 | NULL |
| 831 | }; |
| 832 | |
| 833 | void |
| 834 | _initialize_core_lynx () |
| 835 | { |
| 836 | add_core_fns (&lynx_core_fns); |
| 837 | } |