| 1 | /* Native-dependent code for Linux running on i386's, for GDB. |
| 2 | Copyright (C) 1999, 2000 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, |
| 19 | Boston, MA 02111-1307, USA. */ |
| 20 | |
| 21 | #include "defs.h" |
| 22 | #include "inferior.h" |
| 23 | #include "gdbcore.h" |
| 24 | |
| 25 | /* For i386_linux_skip_solib_resolver. */ |
| 26 | #include "symtab.h" |
| 27 | #include "symfile.h" |
| 28 | #include "objfiles.h" |
| 29 | |
| 30 | #include <sys/ptrace.h> |
| 31 | #include <sys/user.h> |
| 32 | #include <sys/procfs.h> |
| 33 | |
| 34 | #ifdef HAVE_SYS_REG_H |
| 35 | #include <sys/reg.h> |
| 36 | #endif |
| 37 | |
| 38 | /* On Linux, threads are implemented as pseudo-processes, in which |
| 39 | case we may be tracing more than one process at a time. In that |
| 40 | case, inferior_pid will contain the main process ID and the |
| 41 | individual thread (process) ID mashed together. These macros are |
| 42 | used to separate them out. These definitions should be overridden |
| 43 | if thread support is included. */ |
| 44 | |
| 45 | #if !defined (PIDGET) /* Default definition for PIDGET/TIDGET. */ |
| 46 | #define PIDGET(PID) PID |
| 47 | #define TIDGET(PID) 0 |
| 48 | #endif |
| 49 | |
| 50 | |
| 51 | /* The register sets used in Linux ELF core-dumps are identical to the |
| 52 | register sets in `struct user' that is used for a.out core-dumps, |
| 53 | and is also used by `ptrace'. The corresponding types are |
| 54 | `elf_gregset_t' for the general-purpose registers (with |
| 55 | `elf_greg_t' the type of a single GP register) and `elf_fpregset_t' |
| 56 | for the floating-point registers. |
| 57 | |
| 58 | Those types used to be available under the names `gregset_t' and |
| 59 | `fpregset_t' too, and this file used those names in the past. But |
| 60 | those names are now used for the register sets used in the |
| 61 | `mcontext_t' type, and have a different size and layout. */ |
| 62 | |
| 63 | /* Mapping between the general-purpose registers in `struct user' |
| 64 | format and GDB's register array layout. */ |
| 65 | static int regmap[] = |
| 66 | { |
| 67 | EAX, ECX, EDX, EBX, |
| 68 | UESP, EBP, ESI, EDI, |
| 69 | EIP, EFL, CS, SS, |
| 70 | DS, ES, FS, GS |
| 71 | }; |
| 72 | |
| 73 | /* Which ptrace request retrieves which registers? |
| 74 | These apply to the corresponding SET requests as well. */ |
| 75 | #define GETREGS_SUPPLIES(regno) \ |
| 76 | (0 <= (regno) && (regno) <= 15) |
| 77 | #define GETFPREGS_SUPPLIES(regno) \ |
| 78 | (FP0_REGNUM <= (regno) && (regno) <= LAST_FPU_CTRL_REGNUM) |
| 79 | #define GETXFPREGS_SUPPLIES(regno) \ |
| 80 | (FP0_REGNUM <= (regno) && (regno) <= MXCSR_REGNUM) |
| 81 | |
| 82 | /* Does the current host support the GETREGS request? */ |
| 83 | int have_ptrace_getregs = |
| 84 | #ifdef HAVE_PTRACE_GETREGS |
| 85 | 1 |
| 86 | #else |
| 87 | 0 |
| 88 | #endif |
| 89 | ; |
| 90 | |
| 91 | /* Does the current host support the GETXFPREGS request? The header |
| 92 | file may or may not define it, and even if it is defined, the |
| 93 | kernel will return EIO if it's running on a pre-SSE processor. |
| 94 | |
| 95 | PTRACE_GETXFPREGS is a Cygnus invention, since we wrote our own |
| 96 | Linux kernel patch for SSE support. That patch may or may not |
| 97 | actually make it into the official distribution. If you find that |
| 98 | years have gone by since this stuff was added, and Linux isn't |
| 99 | using PTRACE_GETXFPREGS, that means that our patch didn't make it, |
| 100 | and you can delete this, and the related code. |
| 101 | |
| 102 | My instinct is to attach this to some architecture- or |
| 103 | target-specific data structure, but really, a particular GDB |
| 104 | process can only run on top of one kernel at a time. So it's okay |
| 105 | for this to be a simple variable. */ |
| 106 | int have_ptrace_getxfpregs = |
| 107 | #ifdef HAVE_PTRACE_GETXFPREGS |
| 108 | 1 |
| 109 | #else |
| 110 | 0 |
| 111 | #endif |
| 112 | ; |
| 113 | |
| 114 | \f |
| 115 | /* Fetching registers directly from the U area, one at a time. */ |
| 116 | |
| 117 | /* FIXME: kettenis/2000-03-05: This duplicates code from `inptrace.c'. |
| 118 | The problem is that we define FETCH_INFERIOR_REGISTERS since we |
| 119 | want to use our own versions of {fetch,store}_inferior_registers |
| 120 | that use the GETREGS request. This means that the code in |
| 121 | `infptrace.c' is #ifdef'd out. But we need to fall back on that |
| 122 | code when GDB is running on top of a kernel that doesn't support |
| 123 | the GETREGS request. I want to avoid changing `infptrace.c' right |
| 124 | now. */ |
| 125 | |
| 126 | #ifndef PT_READ_U |
| 127 | #define PT_READ_U PTRACE_PEEKUSR |
| 128 | #endif |
| 129 | #ifndef PT_WRITE_U |
| 130 | #define PT_WRITE_U PTRACE_POKEUSR |
| 131 | #endif |
| 132 | |
| 133 | /* Default the type of the ptrace transfer to int. */ |
| 134 | #ifndef PTRACE_XFER_TYPE |
| 135 | #define PTRACE_XFER_TYPE int |
| 136 | #endif |
| 137 | |
| 138 | /* Registers we shouldn't try to fetch. */ |
| 139 | #if !defined (CANNOT_FETCH_REGISTER) |
| 140 | #define CANNOT_FETCH_REGISTER(regno) 0 |
| 141 | #endif |
| 142 | |
| 143 | /* Fetch one register. */ |
| 144 | |
| 145 | static void |
| 146 | fetch_register (regno) |
| 147 | int regno; |
| 148 | { |
| 149 | /* This isn't really an address. But ptrace thinks of it as one. */ |
| 150 | CORE_ADDR regaddr; |
| 151 | char mess[128]; /* For messages */ |
| 152 | register int i; |
| 153 | unsigned int offset; /* Offset of registers within the u area. */ |
| 154 | char buf[MAX_REGISTER_RAW_SIZE]; |
| 155 | int tid; |
| 156 | |
| 157 | if (CANNOT_FETCH_REGISTER (regno)) |
| 158 | { |
| 159 | memset (buf, '\0', REGISTER_RAW_SIZE (regno)); /* Supply zeroes */ |
| 160 | supply_register (regno, buf); |
| 161 | return; |
| 162 | } |
| 163 | |
| 164 | /* Overload thread id onto process id */ |
| 165 | if ((tid = TIDGET (inferior_pid)) == 0) |
| 166 | tid = inferior_pid; /* no thread id, just use process id */ |
| 167 | |
| 168 | offset = U_REGS_OFFSET; |
| 169 | |
| 170 | regaddr = register_addr (regno, offset); |
| 171 | for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (PTRACE_XFER_TYPE)) |
| 172 | { |
| 173 | errno = 0; |
| 174 | *(PTRACE_XFER_TYPE *) & buf[i] = ptrace (PT_READ_U, tid, |
| 175 | (PTRACE_ARG3_TYPE) regaddr, 0); |
| 176 | regaddr += sizeof (PTRACE_XFER_TYPE); |
| 177 | if (errno != 0) |
| 178 | { |
| 179 | sprintf (mess, "reading register %s (#%d)", |
| 180 | REGISTER_NAME (regno), regno); |
| 181 | perror_with_name (mess); |
| 182 | } |
| 183 | } |
| 184 | supply_register (regno, buf); |
| 185 | } |
| 186 | |
| 187 | /* Fetch register values from the inferior. |
| 188 | If REGNO is negative, do this for all registers. |
| 189 | Otherwise, REGNO specifies which register (so we can save time). */ |
| 190 | |
| 191 | void |
| 192 | old_fetch_inferior_registers (regno) |
| 193 | int regno; |
| 194 | { |
| 195 | if (regno >= 0) |
| 196 | { |
| 197 | fetch_register (regno); |
| 198 | } |
| 199 | else |
| 200 | { |
| 201 | for (regno = 0; regno < ARCH_NUM_REGS; regno++) |
| 202 | { |
| 203 | fetch_register (regno); |
| 204 | } |
| 205 | } |
| 206 | } |
| 207 | |
| 208 | /* Registers we shouldn't try to store. */ |
| 209 | #if !defined (CANNOT_STORE_REGISTER) |
| 210 | #define CANNOT_STORE_REGISTER(regno) 0 |
| 211 | #endif |
| 212 | |
| 213 | /* Store one register. */ |
| 214 | |
| 215 | static void |
| 216 | store_register (regno) |
| 217 | int regno; |
| 218 | { |
| 219 | /* This isn't really an address. But ptrace thinks of it as one. */ |
| 220 | CORE_ADDR regaddr; |
| 221 | char mess[128]; /* For messages */ |
| 222 | register int i; |
| 223 | unsigned int offset; /* Offset of registers within the u area. */ |
| 224 | int tid; |
| 225 | |
| 226 | if (CANNOT_STORE_REGISTER (regno)) |
| 227 | { |
| 228 | return; |
| 229 | } |
| 230 | |
| 231 | /* Overload thread id onto process id */ |
| 232 | if ((tid = TIDGET (inferior_pid)) == 0) |
| 233 | tid = inferior_pid; /* no thread id, just use process id */ |
| 234 | |
| 235 | offset = U_REGS_OFFSET; |
| 236 | |
| 237 | regaddr = register_addr (regno, offset); |
| 238 | for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (PTRACE_XFER_TYPE)) |
| 239 | { |
| 240 | errno = 0; |
| 241 | ptrace (PT_WRITE_U, tid, (PTRACE_ARG3_TYPE) regaddr, |
| 242 | *(PTRACE_XFER_TYPE *) & registers[REGISTER_BYTE (regno) + i]); |
| 243 | regaddr += sizeof (PTRACE_XFER_TYPE); |
| 244 | if (errno != 0) |
| 245 | { |
| 246 | sprintf (mess, "writing register %s (#%d)", |
| 247 | REGISTER_NAME (regno), regno); |
| 248 | perror_with_name (mess); |
| 249 | } |
| 250 | } |
| 251 | } |
| 252 | |
| 253 | /* Store our register values back into the inferior. |
| 254 | If REGNO is negative, do this for all registers. |
| 255 | Otherwise, REGNO specifies which register (so we can save time). */ |
| 256 | |
| 257 | void |
| 258 | old_store_inferior_registers (regno) |
| 259 | int regno; |
| 260 | { |
| 261 | if (regno >= 0) |
| 262 | { |
| 263 | store_register (regno); |
| 264 | } |
| 265 | else |
| 266 | { |
| 267 | for (regno = 0; regno < ARCH_NUM_REGS; regno++) |
| 268 | { |
| 269 | store_register (regno); |
| 270 | } |
| 271 | } |
| 272 | } |
| 273 | |
| 274 | \f |
| 275 | /* Transfering the general-purpose registers between GDB, inferiors |
| 276 | and core files. */ |
| 277 | |
| 278 | /* Fill GDB's register array with the genereal-purpose register values |
| 279 | in *GREGSETP. */ |
| 280 | |
| 281 | void |
| 282 | supply_gregset (elf_gregset_t *gregsetp) |
| 283 | { |
| 284 | elf_greg_t *regp = (elf_greg_t *) gregsetp; |
| 285 | int regi; |
| 286 | |
| 287 | for (regi = 0; regi < NUM_GREGS; regi++) |
| 288 | supply_register (regi, (char *) (regp + regmap[regi])); |
| 289 | } |
| 290 | |
| 291 | /* Convert the valid general-purpose register values in GDB's register |
| 292 | array to `struct user' format and store them in *GREGSETP. The |
| 293 | array VALID indicates which register values are valid. If VALID is |
| 294 | NULL, all registers are assumed to be valid. */ |
| 295 | |
| 296 | static void |
| 297 | convert_to_gregset (elf_gregset_t *gregsetp, signed char *valid) |
| 298 | { |
| 299 | elf_greg_t *regp = (elf_greg_t *) gregsetp; |
| 300 | int regi; |
| 301 | |
| 302 | for (regi = 0; regi < NUM_GREGS; regi++) |
| 303 | if (! valid || valid[regi]) |
| 304 | *(regp + regmap[regi]) = * (int *) ®isters[REGISTER_BYTE (regi)]; |
| 305 | } |
| 306 | |
| 307 | /* Fill register REGNO (if it is a general-purpose register) in |
| 308 | *GREGSETPS with the value in GDB's register array. If REGNO is -1, |
| 309 | do this for all registers. */ |
| 310 | void |
| 311 | fill_gregset (elf_gregset_t *gregsetp, int regno) |
| 312 | { |
| 313 | if (regno == -1) |
| 314 | { |
| 315 | convert_to_gregset (gregsetp, NULL); |
| 316 | return; |
| 317 | } |
| 318 | |
| 319 | if (GETREGS_SUPPLIES (regno)) |
| 320 | { |
| 321 | signed char valid[NUM_GREGS]; |
| 322 | |
| 323 | memset (valid, 0, sizeof (valid)); |
| 324 | valid[regno] = 1; |
| 325 | |
| 326 | convert_to_gregset (gregsetp, valid); |
| 327 | } |
| 328 | } |
| 329 | |
| 330 | #ifdef HAVE_PTRACE_GETREGS |
| 331 | |
| 332 | /* Fetch all general-purpose registers from process/thread TID and |
| 333 | store their values in GDB's register array. */ |
| 334 | |
| 335 | static void |
| 336 | fetch_regs (int tid) |
| 337 | { |
| 338 | elf_gregset_t regs; |
| 339 | int ret; |
| 340 | |
| 341 | ret = ptrace (PTRACE_GETREGS, tid, 0, (int) ®s); |
| 342 | if (ret < 0) |
| 343 | { |
| 344 | if (errno == EIO) |
| 345 | { |
| 346 | /* The kernel we're running on doesn't support the GETREGS |
| 347 | request. Reset `have_ptrace_getregs'. */ |
| 348 | have_ptrace_getregs = 0; |
| 349 | return; |
| 350 | } |
| 351 | |
| 352 | warning ("Couldn't get registers."); |
| 353 | return; |
| 354 | } |
| 355 | |
| 356 | supply_gregset (®s); |
| 357 | } |
| 358 | |
| 359 | /* Store all valid general-purpose registers in GDB's register array |
| 360 | into the process/thread specified by TID. */ |
| 361 | |
| 362 | static void |
| 363 | store_regs (int tid) |
| 364 | { |
| 365 | elf_gregset_t regs; |
| 366 | int ret; |
| 367 | |
| 368 | ret = ptrace (PTRACE_GETREGS, tid, 0, (int) ®s); |
| 369 | if (ret < 0) |
| 370 | { |
| 371 | warning ("Couldn't get registers."); |
| 372 | return; |
| 373 | } |
| 374 | |
| 375 | convert_to_gregset (®s, register_valid); |
| 376 | |
| 377 | ret = ptrace (PTRACE_SETREGS, tid, 0, (int) ®s); |
| 378 | if (ret < 0) |
| 379 | { |
| 380 | warning ("Couldn't write registers."); |
| 381 | return; |
| 382 | } |
| 383 | } |
| 384 | |
| 385 | #else |
| 386 | |
| 387 | static void fetch_regs (int tid) {} |
| 388 | static void store_regs (int tid) {} |
| 389 | |
| 390 | #endif |
| 391 | |
| 392 | \f |
| 393 | /* Transfering floating-point registers between GDB, inferiors and cores. */ |
| 394 | |
| 395 | /* What is the address of st(N) within the floating-point register set F? */ |
| 396 | #define FPREG_ADDR(f, n) ((char *) &(f)->st_space + (n) * 10) |
| 397 | |
| 398 | /* Fill GDB's register array with the floating-point register values in |
| 399 | *FPREGSETP. */ |
| 400 | |
| 401 | void |
| 402 | supply_fpregset (elf_fpregset_t *fpregsetp) |
| 403 | { |
| 404 | int reg; |
| 405 | long l; |
| 406 | |
| 407 | /* Supply the floating-point registers. */ |
| 408 | for (reg = 0; reg < 8; reg++) |
| 409 | supply_register (FP0_REGNUM + reg, FPREG_ADDR (fpregsetp, reg)); |
| 410 | |
| 411 | /* We have to mask off the reserved bits in *FPREGSETP before |
| 412 | storing the values in GDB's register file. */ |
| 413 | #define supply(REGNO, MEMBER) \ |
| 414 | l = fpregsetp->MEMBER & 0xffff; \ |
| 415 | supply_register (REGNO, (char *) &l) |
| 416 | |
| 417 | supply (FCTRL_REGNUM, cwd); |
| 418 | supply (FSTAT_REGNUM, swd); |
| 419 | supply (FTAG_REGNUM, twd); |
| 420 | supply_register (FCOFF_REGNUM, (char *) &fpregsetp->fip); |
| 421 | supply (FDS_REGNUM, fos); |
| 422 | supply_register (FDOFF_REGNUM, (char *) &fpregsetp->foo); |
| 423 | |
| 424 | #undef supply |
| 425 | |
| 426 | /* Extract the code segment and opcode from the "fcs" member. */ |
| 427 | l = fpregsetp->fcs & 0xffff; |
| 428 | supply_register (FCS_REGNUM, (char *) &l); |
| 429 | |
| 430 | l = (fpregsetp->fcs >> 16) & ((1 << 11) - 1); |
| 431 | supply_register (FOP_REGNUM, (char *) &l); |
| 432 | } |
| 433 | |
| 434 | /* Convert the valid floating-point register values in GDB's register |
| 435 | array to `struct user' format and store them in *FPREGSETP. The |
| 436 | array VALID indicates which register values are valid. If VALID is |
| 437 | NULL, all registers are assumed to be valid. */ |
| 438 | |
| 439 | static void |
| 440 | convert_to_fpregset (elf_fpregset_t *fpregsetp, signed char *valid) |
| 441 | { |
| 442 | int reg; |
| 443 | |
| 444 | /* Fill in the floating-point registers. */ |
| 445 | for (reg = 0; reg < 8; reg++) |
| 446 | if (!valid || valid[reg]) |
| 447 | memcpy (FPREG_ADDR (fpregsetp, reg), |
| 448 | ®isters[REGISTER_BYTE (FP0_REGNUM + reg)], |
| 449 | REGISTER_RAW_SIZE(FP0_REGNUM + reg)); |
| 450 | |
| 451 | /* We're not supposed to touch the reserved bits in *FPREGSETP. */ |
| 452 | |
| 453 | #define fill(MEMBER, REGNO) \ |
| 454 | if (! valid || valid[(REGNO)]) \ |
| 455 | fpregsetp->MEMBER \ |
| 456 | = ((fpregsetp->MEMBER & ~0xffff) \ |
| 457 | | (* (int *) ®isters[REGISTER_BYTE (REGNO)] & 0xffff)) |
| 458 | |
| 459 | #define fill_register(MEMBER, REGNO) \ |
| 460 | if (! valid || valid[(REGNO)]) \ |
| 461 | memcpy (&fpregsetp->MEMBER, ®isters[REGISTER_BYTE (REGNO)], \ |
| 462 | sizeof (fpregsetp->MEMBER)) |
| 463 | |
| 464 | fill (cwd, FCTRL_REGNUM); |
| 465 | fill (swd, FSTAT_REGNUM); |
| 466 | fill (twd, FTAG_REGNUM); |
| 467 | fill_register (fip, FCOFF_REGNUM); |
| 468 | fill (foo, FDOFF_REGNUM); |
| 469 | fill_register (fos, FDS_REGNUM); |
| 470 | |
| 471 | #undef fill |
| 472 | #undef fill_register |
| 473 | |
| 474 | if (! valid || valid[FCS_REGNUM]) |
| 475 | fpregsetp->fcs |
| 476 | = ((fpregsetp->fcs & ~0xffff) |
| 477 | | (* (int *) ®isters[REGISTER_BYTE (FCS_REGNUM)] & 0xffff)); |
| 478 | |
| 479 | if (! valid || valid[FOP_REGNUM]) |
| 480 | fpregsetp->fcs |
| 481 | = ((fpregsetp->fcs & 0xffff) |
| 482 | | ((*(int *) ®isters[REGISTER_BYTE (FOP_REGNUM)] & ((1 << 11) - 1)) |
| 483 | << 16)); |
| 484 | } |
| 485 | |
| 486 | /* Fill register REGNO (if it is a floating-point register) in |
| 487 | *FPREGSETP with the value in GDB's register array. If REGNO is -1, |
| 488 | do this for all registers. */ |
| 489 | |
| 490 | void |
| 491 | fill_fpregset (elf_fpregset_t *fpregsetp, int regno) |
| 492 | { |
| 493 | if (regno == -1) |
| 494 | { |
| 495 | convert_to_fpregset (fpregsetp, NULL); |
| 496 | return; |
| 497 | } |
| 498 | |
| 499 | if (GETFPREGS_SUPPLIES(regno)) |
| 500 | { |
| 501 | signed char valid[MAX_NUM_REGS]; |
| 502 | |
| 503 | memset (valid, 0, sizeof (valid)); |
| 504 | valid[regno] = 1; |
| 505 | |
| 506 | convert_to_fpregset (fpregsetp, valid); |
| 507 | } |
| 508 | } |
| 509 | |
| 510 | #ifdef HAVE_PTRACE_GETREGS |
| 511 | |
| 512 | /* Fetch all floating-point registers from process/thread TID and store |
| 513 | thier values in GDB's register array. */ |
| 514 | |
| 515 | static void |
| 516 | fetch_fpregs (int tid) |
| 517 | { |
| 518 | elf_fpregset_t fpregs; |
| 519 | int ret; |
| 520 | |
| 521 | ret = ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs); |
| 522 | if (ret < 0) |
| 523 | { |
| 524 | warning ("Couldn't get floating point status."); |
| 525 | return; |
| 526 | } |
| 527 | |
| 528 | supply_fpregset (&fpregs); |
| 529 | } |
| 530 | |
| 531 | /* Store all valid floating-point registers in GDB's register array |
| 532 | into the process/thread specified by TID. */ |
| 533 | |
| 534 | static void |
| 535 | store_fpregs (int tid) |
| 536 | { |
| 537 | elf_fpregset_t fpregs; |
| 538 | int ret; |
| 539 | |
| 540 | ret = ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs); |
| 541 | if (ret < 0) |
| 542 | { |
| 543 | warning ("Couldn't get floating point status."); |
| 544 | return; |
| 545 | } |
| 546 | |
| 547 | convert_to_fpregset (&fpregs, register_valid); |
| 548 | |
| 549 | ret = ptrace (PTRACE_SETFPREGS, tid, 0, (int) &fpregs); |
| 550 | if (ret < 0) |
| 551 | { |
| 552 | warning ("Couldn't write floating point status."); |
| 553 | return; |
| 554 | } |
| 555 | } |
| 556 | |
| 557 | #else |
| 558 | |
| 559 | static void fetch_fpregs (int tid) {} |
| 560 | static void store_fpregs (int tid) {} |
| 561 | |
| 562 | #endif |
| 563 | |
| 564 | \f |
| 565 | /* Transfering floating-point and SSE registers to and from GDB. */ |
| 566 | |
| 567 | /* PTRACE_GETXFPREGS is a Cygnus invention, since we wrote our own |
| 568 | Linux kernel patch for SSE support. That patch may or may not |
| 569 | actually make it into the official distribution. If you find that |
| 570 | years have gone by since this code was added, and Linux isn't using |
| 571 | PTRACE_GETXFPREGS, that means that our patch didn't make it, and |
| 572 | you can delete this code. */ |
| 573 | |
| 574 | #ifdef HAVE_PTRACE_GETXFPREGS |
| 575 | |
| 576 | /* Fill GDB's register array with the floating-point and SSE register |
| 577 | values in *XFPREGS. */ |
| 578 | |
| 579 | static void |
| 580 | supply_xfpregset (struct user_xfpregs_struct *xfpregs) |
| 581 | { |
| 582 | int reg; |
| 583 | |
| 584 | /* Supply the floating-point registers. */ |
| 585 | for (reg = 0; reg < 8; reg++) |
| 586 | supply_register (FP0_REGNUM + reg, (char *) &xfpregs->st_space[reg]); |
| 587 | |
| 588 | { |
| 589 | supply_register (FCTRL_REGNUM, (char *) &xfpregs->cwd); |
| 590 | supply_register (FSTAT_REGNUM, (char *) &xfpregs->swd); |
| 591 | supply_register (FTAG_REGNUM, (char *) &xfpregs->twd); |
| 592 | supply_register (FCOFF_REGNUM, (char *) &xfpregs->fip); |
| 593 | supply_register (FDS_REGNUM, (char *) &xfpregs->fos); |
| 594 | supply_register (FDOFF_REGNUM, (char *) &xfpregs->foo); |
| 595 | |
| 596 | /* Extract the code segment and opcode from the "fcs" member. */ |
| 597 | { |
| 598 | long l; |
| 599 | |
| 600 | l = xfpregs->fcs & 0xffff; |
| 601 | supply_register (FCS_REGNUM, (char *) &l); |
| 602 | |
| 603 | l = (xfpregs->fcs >> 16) & ((1 << 11) - 1); |
| 604 | supply_register (FOP_REGNUM, (char *) &l); |
| 605 | } |
| 606 | } |
| 607 | |
| 608 | /* Supply the SSE registers. */ |
| 609 | for (reg = 0; reg < 8; reg++) |
| 610 | supply_register (XMM0_REGNUM + reg, (char *) &xfpregs->xmm_space[reg]); |
| 611 | supply_register (MXCSR_REGNUM, (char *) &xfpregs->mxcsr); |
| 612 | } |
| 613 | |
| 614 | /* Convert the valid floating-point and SSE registers in GDB's |
| 615 | register array to `struct user' format and store them in *XFPREGS. |
| 616 | The array VALID indicates which registers are valid. If VALID is |
| 617 | NULL, all registers are assumed to be valid. */ |
| 618 | |
| 619 | static void |
| 620 | convert_to_xfpregset (struct user_xfpregs_struct *xfpregs, |
| 621 | signed char *valid) |
| 622 | { |
| 623 | int reg; |
| 624 | |
| 625 | /* Fill in the floating-point registers. */ |
| 626 | for (reg = 0; reg < 8; reg++) |
| 627 | if (!valid || valid[reg]) |
| 628 | memcpy (&xfpregs->st_space[reg], |
| 629 | ®isters[REGISTER_BYTE (FP0_REGNUM + reg)], |
| 630 | REGISTER_RAW_SIZE(FP0_REGNUM + reg)); |
| 631 | |
| 632 | #define fill(MEMBER, REGNO) \ |
| 633 | if (! valid || valid[(REGNO)]) \ |
| 634 | memcpy (&xfpregs->MEMBER, ®isters[REGISTER_BYTE (REGNO)], \ |
| 635 | sizeof (xfpregs->MEMBER)) |
| 636 | |
| 637 | fill (cwd, FCTRL_REGNUM); |
| 638 | fill (swd, FSTAT_REGNUM); |
| 639 | fill (twd, FTAG_REGNUM); |
| 640 | fill (fip, FCOFF_REGNUM); |
| 641 | fill (foo, FDOFF_REGNUM); |
| 642 | fill (fos, FDS_REGNUM); |
| 643 | |
| 644 | #undef fill |
| 645 | |
| 646 | if (! valid || valid[FCS_REGNUM]) |
| 647 | xfpregs->fcs |
| 648 | = ((xfpregs->fcs & ~0xffff) |
| 649 | | (* (int *) ®isters[REGISTER_BYTE (FCS_REGNUM)] & 0xffff)); |
| 650 | |
| 651 | if (! valid || valid[FOP_REGNUM]) |
| 652 | xfpregs->fcs |
| 653 | = ((xfpregs->fcs & 0xffff) |
| 654 | | ((*(int *) ®isters[REGISTER_BYTE (FOP_REGNUM)] & ((1 << 11) - 1)) |
| 655 | << 16)); |
| 656 | |
| 657 | /* Fill in the XMM registers. */ |
| 658 | for (reg = 0; reg < 8; reg++) |
| 659 | if (! valid || valid[reg]) |
| 660 | memcpy (&xfpregs->xmm_space[reg], |
| 661 | ®isters[REGISTER_BYTE (XMM0_REGNUM + reg)], |
| 662 | REGISTER_RAW_SIZE (XMM0_REGNUM + reg)); |
| 663 | } |
| 664 | |
| 665 | /* Fetch all registers covered by the PTRACE_SETXFPREGS request from |
| 666 | process/thread TID and store their values in GDB's register array. |
| 667 | Return non-zero if successful, zero otherwise. */ |
| 668 | |
| 669 | static int |
| 670 | fetch_xfpregs (int tid) |
| 671 | { |
| 672 | struct user_xfpregs_struct xfpregs; |
| 673 | int ret; |
| 674 | |
| 675 | if (! have_ptrace_getxfpregs) |
| 676 | return 0; |
| 677 | |
| 678 | ret = ptrace (PTRACE_GETXFPREGS, tid, 0, &xfpregs); |
| 679 | if (ret == -1) |
| 680 | { |
| 681 | if (errno == EIO) |
| 682 | { |
| 683 | have_ptrace_getxfpregs = 0; |
| 684 | return 0; |
| 685 | } |
| 686 | |
| 687 | warning ("Couldn't read floating-point and SSE registers."); |
| 688 | return 0; |
| 689 | } |
| 690 | |
| 691 | supply_xfpregset (&xfpregs); |
| 692 | return 1; |
| 693 | } |
| 694 | |
| 695 | /* Store all valid registers in GDB's register array covered by the |
| 696 | PTRACE_SETXFPREGS request into the process/thread specified by TID. |
| 697 | Return non-zero if successful, zero otherwise. */ |
| 698 | |
| 699 | static int |
| 700 | store_xfpregs (int tid) |
| 701 | { |
| 702 | struct user_xfpregs_struct xfpregs; |
| 703 | int ret; |
| 704 | |
| 705 | if (! have_ptrace_getxfpregs) |
| 706 | return 0; |
| 707 | |
| 708 | ret = ptrace (PTRACE_GETXFPREGS, tid, 0, &xfpregs); |
| 709 | if (ret == -1) |
| 710 | { |
| 711 | if (errno == EIO) |
| 712 | { |
| 713 | have_ptrace_getxfpregs = 0; |
| 714 | return 0; |
| 715 | } |
| 716 | |
| 717 | warning ("Couldn't read floating-point and SSE registers."); |
| 718 | return 0; |
| 719 | } |
| 720 | |
| 721 | convert_to_xfpregset (&xfpregs, register_valid); |
| 722 | |
| 723 | if (ptrace (PTRACE_SETXFPREGS, tid, 0, &xfpregs) < 0) |
| 724 | { |
| 725 | warning ("Couldn't write floating-point and SSE registers."); |
| 726 | return 0; |
| 727 | } |
| 728 | |
| 729 | return 1; |
| 730 | } |
| 731 | |
| 732 | /* Fill the XMM registers in the register array with dummy values. For |
| 733 | cases where we don't have access to the XMM registers. I think |
| 734 | this is cleaner than printing a warning. For a cleaner solution, |
| 735 | we should gdbarchify the i386 family. */ |
| 736 | |
| 737 | static void |
| 738 | dummy_sse_values (void) |
| 739 | { |
| 740 | /* C doesn't have a syntax for NaN's, so write it out as an array of |
| 741 | longs. */ |
| 742 | static long dummy[4] = { 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff }; |
| 743 | static long mxcsr = 0x1f80; |
| 744 | int reg; |
| 745 | |
| 746 | for (reg = 0; reg < 8; reg++) |
| 747 | supply_register (XMM0_REGNUM + reg, (char *) dummy); |
| 748 | supply_register (MXCSR_REGNUM, (char *) &mxcsr); |
| 749 | } |
| 750 | |
| 751 | #else |
| 752 | |
| 753 | /* Stub versions of the above routines, for systems that don't have |
| 754 | PTRACE_GETXFPREGS. */ |
| 755 | static int store_xfpregs (int tid) { return 0; } |
| 756 | static int fetch_xfpregs (int tid) { return 0; } |
| 757 | static void dummy_sse_values (void) {} |
| 758 | |
| 759 | #endif |
| 760 | |
| 761 | \f |
| 762 | /* Transferring arbitrary registers between GDB and inferior. */ |
| 763 | |
| 764 | /* Fetch register REGNO from the child process. If REGNO is -1, do |
| 765 | this for all registers (including the floating point and SSE |
| 766 | registers). */ |
| 767 | |
| 768 | void |
| 769 | fetch_inferior_registers (int regno) |
| 770 | { |
| 771 | int tid; |
| 772 | |
| 773 | /* Use the old method of peeking around in `struct user' if the |
| 774 | GETREGS request isn't available. */ |
| 775 | if (! have_ptrace_getregs) |
| 776 | { |
| 777 | old_fetch_inferior_registers (regno); |
| 778 | return; |
| 779 | } |
| 780 | |
| 781 | /* Linux LWP ID's are process ID's. */ |
| 782 | if ((tid = TIDGET (inferior_pid)) == 0) |
| 783 | tid = inferior_pid; /* Not a threaded program. */ |
| 784 | |
| 785 | /* Use the PTRACE_GETXFPREGS request whenever possible, since it |
| 786 | transfers more registers in one system call, and we'll cache the |
| 787 | results. But remember that fetch_xfpregs can fail, and return |
| 788 | zero. */ |
| 789 | if (regno == -1) |
| 790 | { |
| 791 | fetch_regs (tid); |
| 792 | |
| 793 | /* The call above might reset `have_ptrace_getregs'. */ |
| 794 | if (! have_ptrace_getregs) |
| 795 | { |
| 796 | old_fetch_inferior_registers (-1); |
| 797 | return; |
| 798 | } |
| 799 | |
| 800 | if (fetch_xfpregs (tid)) |
| 801 | return; |
| 802 | fetch_fpregs (tid); |
| 803 | return; |
| 804 | } |
| 805 | |
| 806 | if (GETREGS_SUPPLIES (regno)) |
| 807 | { |
| 808 | fetch_regs (tid); |
| 809 | return; |
| 810 | } |
| 811 | |
| 812 | if (GETXFPREGS_SUPPLIES (regno)) |
| 813 | { |
| 814 | if (fetch_xfpregs (tid)) |
| 815 | return; |
| 816 | |
| 817 | /* Either our processor or our kernel doesn't support the SSE |
| 818 | registers, so read the FP registers in the traditional way, |
| 819 | and fill the SSE registers with dummy values. It would be |
| 820 | more graceful to handle differences in the register set using |
| 821 | gdbarch. Until then, this will at least make things work |
| 822 | plausibly. */ |
| 823 | fetch_fpregs (tid); |
| 824 | dummy_sse_values (); |
| 825 | return; |
| 826 | } |
| 827 | |
| 828 | internal_error ("i386-linux-nat.c (fetch_inferior_registers): " |
| 829 | "got request for bad register number %d", regno); |
| 830 | } |
| 831 | |
| 832 | /* Store register REGNO back into the child process. If REGNO is -1, |
| 833 | do this for all registers (including the floating point and SSE |
| 834 | registers). */ |
| 835 | void |
| 836 | store_inferior_registers (int regno) |
| 837 | { |
| 838 | int tid; |
| 839 | |
| 840 | /* Use the old method of poking around in `struct user' if the |
| 841 | SETREGS request isn't available. */ |
| 842 | if (! have_ptrace_getregs) |
| 843 | { |
| 844 | old_store_inferior_registers (regno); |
| 845 | return; |
| 846 | } |
| 847 | |
| 848 | /* Linux LWP ID's are process ID's. */ |
| 849 | if ((tid = TIDGET (inferior_pid)) == 0) |
| 850 | tid = inferior_pid; /* Not a threaded program. */ |
| 851 | |
| 852 | /* Use the PTRACE_SETXFPREGS requests whenever possibl, since it |
| 853 | transfers more registers in one system call. But remember that |
| 854 | store_xfpregs can fail, and return zero. */ |
| 855 | if (regno == -1) |
| 856 | { |
| 857 | store_regs (tid); |
| 858 | if (store_xfpregs (tid)) |
| 859 | return; |
| 860 | store_fpregs (tid); |
| 861 | return; |
| 862 | } |
| 863 | |
| 864 | if (GETREGS_SUPPLIES (regno)) |
| 865 | { |
| 866 | store_regs (tid); |
| 867 | return; |
| 868 | } |
| 869 | |
| 870 | if (GETXFPREGS_SUPPLIES (regno)) |
| 871 | { |
| 872 | if (store_xfpregs (tid)) |
| 873 | return; |
| 874 | |
| 875 | /* Either our processor or our kernel doesn't support the SSE |
| 876 | registers, so just write the FP registers in the traditional |
| 877 | way. */ |
| 878 | store_fpregs (tid); |
| 879 | return; |
| 880 | } |
| 881 | |
| 882 | internal_error ("Got request to store bad register number %d.", regno); |
| 883 | } |
| 884 | |
| 885 | \f |
| 886 | /* Interpreting register set info found in core files. */ |
| 887 | |
| 888 | /* Provide registers to GDB from a core file. |
| 889 | |
| 890 | (We can't use the generic version of this function in |
| 891 | core-regset.c, because Linux has *three* different kinds of |
| 892 | register set notes. core-regset.c would have to call |
| 893 | supply_xfpregset, which most platforms don't have.) |
| 894 | |
| 895 | CORE_REG_SECT points to an array of bytes, which are the contents |
| 896 | of a `note' from a core file which BFD thinks might contain |
| 897 | register contents. CORE_REG_SIZE is its size. |
| 898 | |
| 899 | WHICH says which register set corelow suspects this is: |
| 900 | 0 --- the general-purpose register set, in elf_gregset_t format |
| 901 | 2 --- the floating-point register set, in elf_fpregset_t format |
| 902 | 3 --- the extended floating-point register set, in struct |
| 903 | user_xfpregs_struct format |
| 904 | |
| 905 | REG_ADDR isn't used on Linux. */ |
| 906 | |
| 907 | static void |
| 908 | fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, |
| 909 | int which, CORE_ADDR reg_addr) |
| 910 | { |
| 911 | elf_gregset_t gregset; |
| 912 | elf_fpregset_t fpregset; |
| 913 | |
| 914 | switch (which) |
| 915 | { |
| 916 | case 0: |
| 917 | if (core_reg_size != sizeof (gregset)) |
| 918 | warning ("Wrong size gregset in core file."); |
| 919 | else |
| 920 | { |
| 921 | memcpy (&gregset, core_reg_sect, sizeof (gregset)); |
| 922 | supply_gregset (&gregset); |
| 923 | } |
| 924 | break; |
| 925 | |
| 926 | case 2: |
| 927 | if (core_reg_size != sizeof (fpregset)) |
| 928 | warning ("Wrong size fpregset in core file."); |
| 929 | else |
| 930 | { |
| 931 | memcpy (&fpregset, core_reg_sect, sizeof (fpregset)); |
| 932 | supply_fpregset (&fpregset); |
| 933 | } |
| 934 | break; |
| 935 | |
| 936 | #ifdef HAVE_PTRACE_GETXFPREGS |
| 937 | { |
| 938 | struct user_xfpregs_struct xfpregset; |
| 939 | |
| 940 | case 3: |
| 941 | if (core_reg_size != sizeof (xfpregset)) |
| 942 | warning ("Wrong size user_xfpregs_struct in core file."); |
| 943 | else |
| 944 | { |
| 945 | memcpy (&xfpregset, core_reg_sect, sizeof (xfpregset)); |
| 946 | supply_xfpregset (&xfpregset); |
| 947 | } |
| 948 | break; |
| 949 | } |
| 950 | #endif |
| 951 | |
| 952 | default: |
| 953 | /* We've covered all the kinds of registers we know about here, |
| 954 | so this must be something we wouldn't know what to do with |
| 955 | anyway. Just ignore it. */ |
| 956 | break; |
| 957 | } |
| 958 | } |
| 959 | |
| 960 | \f |
| 961 | /* The instruction for a Linux system call is: |
| 962 | int $0x80 |
| 963 | or 0xcd 0x80. */ |
| 964 | |
| 965 | static const unsigned char linux_syscall[] = { 0xcd, 0x80 }; |
| 966 | |
| 967 | #define LINUX_SYSCALL_LEN (sizeof linux_syscall) |
| 968 | |
| 969 | /* The system call number is stored in the %eax register. */ |
| 970 | #define LINUX_SYSCALL_REGNUM 0 /* %eax */ |
| 971 | |
| 972 | /* We are specifically interested in the sigreturn and rt_sigreturn |
| 973 | system calls. */ |
| 974 | |
| 975 | #ifndef SYS_sigreturn |
| 976 | #define SYS_sigreturn 0x77 |
| 977 | #endif |
| 978 | #ifndef SYS_rt_sigreturn |
| 979 | #define SYS_rt_sigreturn 0xad |
| 980 | #endif |
| 981 | |
| 982 | /* Offset to saved processor flags, from <asm/sigcontext.h>. */ |
| 983 | #define LINUX_SIGCONTEXT_EFLAGS_OFFSET (64) |
| 984 | |
| 985 | /* Resume execution of the inferior process. |
| 986 | If STEP is nonzero, single-step it. |
| 987 | If SIGNAL is nonzero, give it that signal. */ |
| 988 | |
| 989 | void |
| 990 | child_resume (int pid, int step, enum target_signal signal) |
| 991 | { |
| 992 | int request = PTRACE_CONT; |
| 993 | |
| 994 | if (pid == -1) |
| 995 | /* Resume all threads. */ |
| 996 | /* I think this only gets used in the non-threaded case, where "resume |
| 997 | all threads" and "resume inferior_pid" are the same. */ |
| 998 | pid = inferior_pid; |
| 999 | |
| 1000 | if (step) |
| 1001 | { |
| 1002 | CORE_ADDR pc = read_pc_pid (pid); |
| 1003 | unsigned char buf[LINUX_SYSCALL_LEN]; |
| 1004 | |
| 1005 | request = PTRACE_SINGLESTEP; |
| 1006 | |
| 1007 | /* Returning from a signal trampoline is done by calling a |
| 1008 | special system call (sigreturn or rt_sigreturn, see |
| 1009 | i386-linux-tdep.c for more information). This system call |
| 1010 | restores the registers that were saved when the signal was |
| 1011 | raised, including %eflags. That means that single-stepping |
| 1012 | won't work. Instead, we'll have to modify the signal context |
| 1013 | that's about to be restored, and set the trace flag there. */ |
| 1014 | |
| 1015 | /* First check if PC is at a system call. */ |
| 1016 | if (read_memory_nobpt (pc, (char *) buf, LINUX_SYSCALL_LEN) == 0 |
| 1017 | && memcmp (buf, linux_syscall, LINUX_SYSCALL_LEN) == 0) |
| 1018 | { |
| 1019 | int syscall = read_register_pid (LINUX_SYSCALL_REGNUM, pid); |
| 1020 | |
| 1021 | /* Then check the system call number. */ |
| 1022 | if (syscall == SYS_sigreturn || syscall == SYS_rt_sigreturn) |
| 1023 | { |
| 1024 | CORE_ADDR sp = read_register (SP_REGNUM); |
| 1025 | CORE_ADDR addr = sp; |
| 1026 | unsigned long int eflags; |
| 1027 | |
| 1028 | if (syscall == SYS_rt_sigreturn) |
| 1029 | addr = read_memory_integer (sp + 8, 4) + 20; |
| 1030 | |
| 1031 | /* Set the trace flag in the context that's about to be |
| 1032 | restored. */ |
| 1033 | addr += LINUX_SIGCONTEXT_EFLAGS_OFFSET; |
| 1034 | read_memory (addr, (char *) &eflags, 4); |
| 1035 | eflags |= 0x0100; |
| 1036 | write_memory (addr, (char *) &eflags, 4); |
| 1037 | } |
| 1038 | } |
| 1039 | } |
| 1040 | |
| 1041 | if (ptrace (request, pid, 0, target_signal_to_host (signal)) == -1) |
| 1042 | perror_with_name ("ptrace"); |
| 1043 | } |
| 1044 | |
| 1045 | \f |
| 1046 | /* Calling functions in shared libraries. */ |
| 1047 | /* FIXME: kettenis/2000-03-05: Doesn't this belong in a |
| 1048 | target-dependent file? The function |
| 1049 | `i386_linux_skip_solib_resolver' is mentioned in |
| 1050 | `config/i386/tm-linux.h'. */ |
| 1051 | |
| 1052 | /* Find the minimal symbol named NAME, and return both the minsym |
| 1053 | struct and its objfile. This probably ought to be in minsym.c, but |
| 1054 | everything there is trying to deal with things like C++ and |
| 1055 | SOFUN_ADDRESS_MAYBE_TURQUOISE, ... Since this is so simple, it may |
| 1056 | be considered too special-purpose for general consumption. */ |
| 1057 | |
| 1058 | static struct minimal_symbol * |
| 1059 | find_minsym_and_objfile (char *name, struct objfile **objfile_p) |
| 1060 | { |
| 1061 | struct objfile *objfile; |
| 1062 | |
| 1063 | ALL_OBJFILES (objfile) |
| 1064 | { |
| 1065 | struct minimal_symbol *msym; |
| 1066 | |
| 1067 | ALL_OBJFILE_MSYMBOLS (objfile, msym) |
| 1068 | { |
| 1069 | if (SYMBOL_NAME (msym) |
| 1070 | && STREQ (SYMBOL_NAME (msym), name)) |
| 1071 | { |
| 1072 | *objfile_p = objfile; |
| 1073 | return msym; |
| 1074 | } |
| 1075 | } |
| 1076 | } |
| 1077 | |
| 1078 | return 0; |
| 1079 | } |
| 1080 | |
| 1081 | |
| 1082 | static CORE_ADDR |
| 1083 | skip_hurd_resolver (CORE_ADDR pc) |
| 1084 | { |
| 1085 | /* The HURD dynamic linker is part of the GNU C library, so many |
| 1086 | GNU/Linux distributions use it. (All ELF versions, as far as I |
| 1087 | know.) An unresolved PLT entry points to "_dl_runtime_resolve", |
| 1088 | which calls "fixup" to patch the PLT, and then passes control to |
| 1089 | the function. |
| 1090 | |
| 1091 | We look for the symbol `_dl_runtime_resolve', and find `fixup' in |
| 1092 | the same objfile. If we are at the entry point of `fixup', then |
| 1093 | we set a breakpoint at the return address (at the top of the |
| 1094 | stack), and continue. |
| 1095 | |
| 1096 | It's kind of gross to do all these checks every time we're |
| 1097 | called, since they don't change once the executable has gotten |
| 1098 | started. But this is only a temporary hack --- upcoming versions |
| 1099 | of Linux will provide a portable, efficient interface for |
| 1100 | debugging programs that use shared libraries. */ |
| 1101 | |
| 1102 | struct objfile *objfile; |
| 1103 | struct minimal_symbol *resolver |
| 1104 | = find_minsym_and_objfile ("_dl_runtime_resolve", &objfile); |
| 1105 | |
| 1106 | if (resolver) |
| 1107 | { |
| 1108 | struct minimal_symbol *fixup |
| 1109 | = lookup_minimal_symbol ("fixup", 0, objfile); |
| 1110 | |
| 1111 | if (fixup && SYMBOL_VALUE_ADDRESS (fixup) == pc) |
| 1112 | return (SAVED_PC_AFTER_CALL (get_current_frame ())); |
| 1113 | } |
| 1114 | |
| 1115 | return 0; |
| 1116 | } |
| 1117 | |
| 1118 | /* See the comments for SKIP_SOLIB_RESOLVER at the top of infrun.c. |
| 1119 | This function: |
| 1120 | 1) decides whether a PLT has sent us into the linker to resolve |
| 1121 | a function reference, and |
| 1122 | 2) if so, tells us where to set a temporary breakpoint that will |
| 1123 | trigger when the dynamic linker is done. */ |
| 1124 | |
| 1125 | CORE_ADDR |
| 1126 | i386_linux_skip_solib_resolver (CORE_ADDR pc) |
| 1127 | { |
| 1128 | CORE_ADDR result; |
| 1129 | |
| 1130 | /* Plug in functions for other kinds of resolvers here. */ |
| 1131 | result = skip_hurd_resolver (pc); |
| 1132 | if (result) |
| 1133 | return result; |
| 1134 | |
| 1135 | return 0; |
| 1136 | } |
| 1137 | |
| 1138 | \f |
| 1139 | /* Register that we are able to handle Linux ELF core file formats. */ |
| 1140 | |
| 1141 | static struct core_fns linux_elf_core_fns = |
| 1142 | { |
| 1143 | bfd_target_elf_flavour, /* core_flavour */ |
| 1144 | default_check_format, /* check_format */ |
| 1145 | default_core_sniffer, /* core_sniffer */ |
| 1146 | fetch_core_registers, /* core_read_registers */ |
| 1147 | NULL /* next */ |
| 1148 | }; |
| 1149 | |
| 1150 | void |
| 1151 | _initialize_i386_linux_nat () |
| 1152 | { |
| 1153 | add_core_fns (&linux_elf_core_fns); |
| 1154 | } |