| 1 | /* Native-dependent code for GNU/Linux x86-64. |
| 2 | |
| 3 | Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, |
| 4 | 2011 Free Software Foundation, Inc. |
| 5 | Contributed by Jiri Smid, SuSE Labs. |
| 6 | |
| 7 | This file is part of GDB. |
| 8 | |
| 9 | This program is free software; you can redistribute it and/or modify |
| 10 | it under the terms of the GNU General Public License as published by |
| 11 | the Free Software Foundation; either version 3 of the License, or |
| 12 | (at your option) any later version. |
| 13 | |
| 14 | This program is distributed in the hope that it will be useful, |
| 15 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | GNU General Public License for more details. |
| 18 | |
| 19 | You should have received a copy of the GNU General Public License |
| 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 21 | |
| 22 | #include "defs.h" |
| 23 | #include "inferior.h" |
| 24 | #include "gdbcore.h" |
| 25 | #include "regcache.h" |
| 26 | #include "regset.h" |
| 27 | #include "linux-nat.h" |
| 28 | #include "amd64-linux-tdep.h" |
| 29 | |
| 30 | #include "gdb_assert.h" |
| 31 | #include "gdb_string.h" |
| 32 | #include "elf/common.h" |
| 33 | #include <sys/uio.h> |
| 34 | #include <sys/ptrace.h> |
| 35 | #include <sys/debugreg.h> |
| 36 | #include <sys/syscall.h> |
| 37 | #include <sys/procfs.h> |
| 38 | #include <asm/prctl.h> |
| 39 | /* FIXME ezannoni-2003-07-09: we need <sys/reg.h> to be included after |
| 40 | <asm/ptrace.h> because the latter redefines FS and GS for no apparent |
| 41 | reason, and those definitions don't match the ones that libpthread_db |
| 42 | uses, which come from <sys/reg.h>. */ |
| 43 | /* ezannoni-2003-07-09: I think this is fixed. The extraneous defs have |
| 44 | been removed from ptrace.h in the kernel. However, better safe than |
| 45 | sorry. */ |
| 46 | #include <asm/ptrace.h> |
| 47 | #include <sys/reg.h> |
| 48 | #include "gdb_proc_service.h" |
| 49 | |
| 50 | /* Prototypes for supply_gregset etc. */ |
| 51 | #include "gregset.h" |
| 52 | |
| 53 | #include "amd64-tdep.h" |
| 54 | #include "i386-linux-tdep.h" |
| 55 | #include "amd64-nat.h" |
| 56 | #include "i386-nat.h" |
| 57 | #include "i386-xstate.h" |
| 58 | |
| 59 | #ifndef PTRACE_GETREGSET |
| 60 | #define PTRACE_GETREGSET 0x4204 |
| 61 | #endif |
| 62 | |
| 63 | #ifndef PTRACE_SETREGSET |
| 64 | #define PTRACE_SETREGSET 0x4205 |
| 65 | #endif |
| 66 | |
| 67 | /* Does the current host support PTRACE_GETREGSET? */ |
| 68 | static int have_ptrace_getregset = -1; |
| 69 | |
| 70 | /* Mapping between the general-purpose registers in GNU/Linux x86-64 |
| 71 | `struct user' format and GDB's register cache layout for GNU/Linux |
| 72 | i386. |
| 73 | |
| 74 | Note that most GNU/Linux x86-64 registers are 64-bit, while the |
| 75 | GNU/Linux i386 registers are all 32-bit, but since we're |
| 76 | little-endian we get away with that. */ |
| 77 | |
| 78 | /* From <sys/reg.h> on GNU/Linux i386. */ |
| 79 | static int amd64_linux_gregset32_reg_offset[] = |
| 80 | { |
| 81 | RAX * 8, RCX * 8, /* %eax, %ecx */ |
| 82 | RDX * 8, RBX * 8, /* %edx, %ebx */ |
| 83 | RSP * 8, RBP * 8, /* %esp, %ebp */ |
| 84 | RSI * 8, RDI * 8, /* %esi, %edi */ |
| 85 | RIP * 8, EFLAGS * 8, /* %eip, %eflags */ |
| 86 | CS * 8, SS * 8, /* %cs, %ss */ |
| 87 | DS * 8, ES * 8, /* %ds, %es */ |
| 88 | FS * 8, GS * 8, /* %fs, %gs */ |
| 89 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 90 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 91 | -1, -1, -1, -1, -1, -1, -1, -1, -1, |
| 92 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 93 | ORIG_RAX * 8 /* "orig_eax" */ |
| 94 | }; |
| 95 | \f |
| 96 | |
| 97 | /* Transfering the general-purpose registers between GDB, inferiors |
| 98 | and core files. */ |
| 99 | |
| 100 | /* Fill GDB's register cache with the general-purpose register values |
| 101 | in *GREGSETP. */ |
| 102 | |
| 103 | void |
| 104 | supply_gregset (struct regcache *regcache, const elf_gregset_t *gregsetp) |
| 105 | { |
| 106 | amd64_supply_native_gregset (regcache, gregsetp, -1); |
| 107 | } |
| 108 | |
| 109 | /* Fill register REGNUM (if it is a general-purpose register) in |
| 110 | *GREGSETP with the value in GDB's register cache. If REGNUM is -1, |
| 111 | do this for all registers. */ |
| 112 | |
| 113 | void |
| 114 | fill_gregset (const struct regcache *regcache, |
| 115 | elf_gregset_t *gregsetp, int regnum) |
| 116 | { |
| 117 | amd64_collect_native_gregset (regcache, gregsetp, regnum); |
| 118 | } |
| 119 | |
| 120 | /* Transfering floating-point registers between GDB, inferiors and cores. */ |
| 121 | |
| 122 | /* Fill GDB's register cache with the floating-point and SSE register |
| 123 | values in *FPREGSETP. */ |
| 124 | |
| 125 | void |
| 126 | supply_fpregset (struct regcache *regcache, const elf_fpregset_t *fpregsetp) |
| 127 | { |
| 128 | amd64_supply_fxsave (regcache, -1, fpregsetp); |
| 129 | } |
| 130 | |
| 131 | /* Fill register REGNUM (if it is a floating-point or SSE register) in |
| 132 | *FPREGSETP with the value in GDB's register cache. If REGNUM is |
| 133 | -1, do this for all registers. */ |
| 134 | |
| 135 | void |
| 136 | fill_fpregset (const struct regcache *regcache, |
| 137 | elf_fpregset_t *fpregsetp, int regnum) |
| 138 | { |
| 139 | amd64_collect_fxsave (regcache, regnum, fpregsetp); |
| 140 | } |
| 141 | \f |
| 142 | |
| 143 | /* Transferring arbitrary registers between GDB and inferior. */ |
| 144 | |
| 145 | /* Fetch register REGNUM from the child process. If REGNUM is -1, do |
| 146 | this for all registers (including the floating point and SSE |
| 147 | registers). */ |
| 148 | |
| 149 | static void |
| 150 | amd64_linux_fetch_inferior_registers (struct target_ops *ops, |
| 151 | struct regcache *regcache, int regnum) |
| 152 | { |
| 153 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 154 | int tid; |
| 155 | |
| 156 | /* GNU/Linux LWP ID's are process ID's. */ |
| 157 | tid = TIDGET (inferior_ptid); |
| 158 | if (tid == 0) |
| 159 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ |
| 160 | |
| 161 | if (regnum == -1 || amd64_native_gregset_supplies_p (gdbarch, regnum)) |
| 162 | { |
| 163 | elf_gregset_t regs; |
| 164 | |
| 165 | if (ptrace (PTRACE_GETREGS, tid, 0, (long) ®s) < 0) |
| 166 | perror_with_name (_("Couldn't get registers")); |
| 167 | |
| 168 | amd64_supply_native_gregset (regcache, ®s, -1); |
| 169 | if (regnum != -1) |
| 170 | return; |
| 171 | } |
| 172 | |
| 173 | if (regnum == -1 || !amd64_native_gregset_supplies_p (gdbarch, regnum)) |
| 174 | { |
| 175 | elf_fpregset_t fpregs; |
| 176 | |
| 177 | if (have_ptrace_getregset) |
| 178 | { |
| 179 | char xstateregs[I386_XSTATE_MAX_SIZE]; |
| 180 | struct iovec iov; |
| 181 | |
| 182 | iov.iov_base = xstateregs; |
| 183 | iov.iov_len = sizeof (xstateregs); |
| 184 | if (ptrace (PTRACE_GETREGSET, tid, |
| 185 | (unsigned int) NT_X86_XSTATE, (long) &iov) < 0) |
| 186 | perror_with_name (_("Couldn't get extended state status")); |
| 187 | |
| 188 | amd64_supply_xsave (regcache, -1, xstateregs); |
| 189 | } |
| 190 | else |
| 191 | { |
| 192 | if (ptrace (PTRACE_GETFPREGS, tid, 0, (long) &fpregs) < 0) |
| 193 | perror_with_name (_("Couldn't get floating point status")); |
| 194 | |
| 195 | amd64_supply_fxsave (regcache, -1, &fpregs); |
| 196 | } |
| 197 | } |
| 198 | } |
| 199 | |
| 200 | /* Store register REGNUM back into the child process. If REGNUM is |
| 201 | -1, do this for all registers (including the floating-point and SSE |
| 202 | registers). */ |
| 203 | |
| 204 | static void |
| 205 | amd64_linux_store_inferior_registers (struct target_ops *ops, |
| 206 | struct regcache *regcache, int regnum) |
| 207 | { |
| 208 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 209 | int tid; |
| 210 | |
| 211 | /* GNU/Linux LWP ID's are process ID's. */ |
| 212 | tid = TIDGET (inferior_ptid); |
| 213 | if (tid == 0) |
| 214 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ |
| 215 | |
| 216 | if (regnum == -1 || amd64_native_gregset_supplies_p (gdbarch, regnum)) |
| 217 | { |
| 218 | elf_gregset_t regs; |
| 219 | |
| 220 | if (ptrace (PTRACE_GETREGS, tid, 0, (long) ®s) < 0) |
| 221 | perror_with_name (_("Couldn't get registers")); |
| 222 | |
| 223 | amd64_collect_native_gregset (regcache, ®s, regnum); |
| 224 | |
| 225 | if (ptrace (PTRACE_SETREGS, tid, 0, (long) ®s) < 0) |
| 226 | perror_with_name (_("Couldn't write registers")); |
| 227 | |
| 228 | if (regnum != -1) |
| 229 | return; |
| 230 | } |
| 231 | |
| 232 | if (regnum == -1 || !amd64_native_gregset_supplies_p (gdbarch, regnum)) |
| 233 | { |
| 234 | elf_fpregset_t fpregs; |
| 235 | |
| 236 | if (have_ptrace_getregset) |
| 237 | { |
| 238 | char xstateregs[I386_XSTATE_MAX_SIZE]; |
| 239 | struct iovec iov; |
| 240 | |
| 241 | iov.iov_base = xstateregs; |
| 242 | iov.iov_len = sizeof (xstateregs); |
| 243 | if (ptrace (PTRACE_GETREGSET, tid, |
| 244 | (unsigned int) NT_X86_XSTATE, (long) &iov) < 0) |
| 245 | perror_with_name (_("Couldn't get extended state status")); |
| 246 | |
| 247 | amd64_collect_xsave (regcache, regnum, xstateregs, 0); |
| 248 | |
| 249 | if (ptrace (PTRACE_SETREGSET, tid, |
| 250 | (unsigned int) NT_X86_XSTATE, (long) &iov) < 0) |
| 251 | perror_with_name (_("Couldn't write extended state status")); |
| 252 | } |
| 253 | else |
| 254 | { |
| 255 | if (ptrace (PTRACE_GETFPREGS, tid, 0, (long) &fpregs) < 0) |
| 256 | perror_with_name (_("Couldn't get floating point status")); |
| 257 | |
| 258 | amd64_collect_fxsave (regcache, regnum, &fpregs); |
| 259 | |
| 260 | if (ptrace (PTRACE_SETFPREGS, tid, 0, (long) &fpregs) < 0) |
| 261 | perror_with_name (_("Couldn't write floating point status")); |
| 262 | } |
| 263 | } |
| 264 | } |
| 265 | \f |
| 266 | /* Support for debug registers. */ |
| 267 | |
| 268 | static unsigned long amd64_linux_dr[DR_CONTROL + 1]; |
| 269 | |
| 270 | static unsigned long |
| 271 | amd64_linux_dr_get (ptid_t ptid, int regnum) |
| 272 | { |
| 273 | int tid; |
| 274 | unsigned long value; |
| 275 | |
| 276 | tid = TIDGET (ptid); |
| 277 | if (tid == 0) |
| 278 | tid = PIDGET (ptid); |
| 279 | |
| 280 | /* FIXME: kettenis/2001-03-27: Calling perror_with_name if the |
| 281 | ptrace call fails breaks debugging remote targets. The correct |
| 282 | way to fix this is to add the hardware breakpoint and watchpoint |
| 283 | stuff to the target vector. For now, just return zero if the |
| 284 | ptrace call fails. */ |
| 285 | errno = 0; |
| 286 | value = ptrace (PTRACE_PEEKUSER, tid, |
| 287 | offsetof (struct user, u_debugreg[regnum]), 0); |
| 288 | if (errno != 0) |
| 289 | #if 0 |
| 290 | perror_with_name (_("Couldn't read debug register")); |
| 291 | #else |
| 292 | return 0; |
| 293 | #endif |
| 294 | |
| 295 | return value; |
| 296 | } |
| 297 | |
| 298 | /* Set debug register REGNUM to VALUE in only the one LWP of PTID. */ |
| 299 | |
| 300 | static void |
| 301 | amd64_linux_dr_set (ptid_t ptid, int regnum, unsigned long value) |
| 302 | { |
| 303 | int tid; |
| 304 | |
| 305 | tid = TIDGET (ptid); |
| 306 | if (tid == 0) |
| 307 | tid = PIDGET (ptid); |
| 308 | |
| 309 | errno = 0; |
| 310 | ptrace (PTRACE_POKEUSER, tid, |
| 311 | offsetof (struct user, u_debugreg[regnum]), value); |
| 312 | if (errno != 0) |
| 313 | perror_with_name (_("Couldn't write debug register")); |
| 314 | } |
| 315 | |
| 316 | /* Set DR_CONTROL to ADDR in all LWPs of LWP_LIST. */ |
| 317 | |
| 318 | static void |
| 319 | amd64_linux_dr_set_control (unsigned long control) |
| 320 | { |
| 321 | struct lwp_info *lp; |
| 322 | ptid_t ptid; |
| 323 | |
| 324 | amd64_linux_dr[DR_CONTROL] = control; |
| 325 | ALL_LWPS (lp, ptid) |
| 326 | amd64_linux_dr_set (ptid, DR_CONTROL, control); |
| 327 | } |
| 328 | |
| 329 | /* Set address REGNUM (zero based) to ADDR in all LWPs of LWP_LIST. */ |
| 330 | |
| 331 | static void |
| 332 | amd64_linux_dr_set_addr (int regnum, CORE_ADDR addr) |
| 333 | { |
| 334 | struct lwp_info *lp; |
| 335 | ptid_t ptid; |
| 336 | |
| 337 | gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR); |
| 338 | |
| 339 | amd64_linux_dr[DR_FIRSTADDR + regnum] = addr; |
| 340 | ALL_LWPS (lp, ptid) |
| 341 | amd64_linux_dr_set (ptid, DR_FIRSTADDR + regnum, addr); |
| 342 | } |
| 343 | |
| 344 | /* Set address REGNUM (zero based) to zero in all LWPs of LWP_LIST. */ |
| 345 | |
| 346 | static void |
| 347 | amd64_linux_dr_reset_addr (int regnum) |
| 348 | { |
| 349 | amd64_linux_dr_set_addr (regnum, 0); |
| 350 | } |
| 351 | |
| 352 | /* Get DR_STATUS from only the one LWP of INFERIOR_PTID. */ |
| 353 | |
| 354 | static unsigned long |
| 355 | amd64_linux_dr_get_status (void) |
| 356 | { |
| 357 | return amd64_linux_dr_get (inferior_ptid, DR_STATUS); |
| 358 | } |
| 359 | |
| 360 | /* Unset MASK bits in DR_STATUS in all LWPs of LWP_LIST. */ |
| 361 | |
| 362 | static void |
| 363 | amd64_linux_dr_unset_status (unsigned long mask) |
| 364 | { |
| 365 | struct lwp_info *lp; |
| 366 | ptid_t ptid; |
| 367 | |
| 368 | ALL_LWPS (lp, ptid) |
| 369 | { |
| 370 | unsigned long value; |
| 371 | |
| 372 | value = amd64_linux_dr_get (ptid, DR_STATUS); |
| 373 | value &= ~mask; |
| 374 | amd64_linux_dr_set (ptid, DR_STATUS, value); |
| 375 | } |
| 376 | } |
| 377 | |
| 378 | |
| 379 | static void |
| 380 | amd64_linux_new_thread (ptid_t ptid) |
| 381 | { |
| 382 | int i; |
| 383 | |
| 384 | for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++) |
| 385 | amd64_linux_dr_set (ptid, i, amd64_linux_dr[i]); |
| 386 | |
| 387 | amd64_linux_dr_set (ptid, DR_CONTROL, amd64_linux_dr[DR_CONTROL]); |
| 388 | } |
| 389 | \f |
| 390 | |
| 391 | /* This function is called by libthread_db as part of its handling of |
| 392 | a request for a thread's local storage address. */ |
| 393 | |
| 394 | ps_err_e |
| 395 | ps_get_thread_area (const struct ps_prochandle *ph, |
| 396 | lwpid_t lwpid, int idx, void **base) |
| 397 | { |
| 398 | if (gdbarch_ptr_bit (target_gdbarch) == 32) |
| 399 | { |
| 400 | /* The full structure is found in <asm-i386/ldt.h>. The second |
| 401 | integer is the LDT's base_address and that is used to locate |
| 402 | the thread's local storage. See i386-linux-nat.c more |
| 403 | info. */ |
| 404 | unsigned int desc[4]; |
| 405 | |
| 406 | /* This code assumes that "int" is 32 bits and that |
| 407 | GET_THREAD_AREA returns no more than 4 int values. */ |
| 408 | gdb_assert (sizeof (int) == 4); |
| 409 | #ifndef PTRACE_GET_THREAD_AREA |
| 410 | #define PTRACE_GET_THREAD_AREA 25 |
| 411 | #endif |
| 412 | if (ptrace (PTRACE_GET_THREAD_AREA, |
| 413 | lwpid, (void *) (long) idx, (unsigned long) &desc) < 0) |
| 414 | return PS_ERR; |
| 415 | |
| 416 | /* Extend the value to 64 bits. Here it's assumed that a "long" |
| 417 | and a "void *" are the same. */ |
| 418 | (*base) = (void *) (long) desc[1]; |
| 419 | return PS_OK; |
| 420 | } |
| 421 | else |
| 422 | { |
| 423 | /* This definition comes from prctl.h, but some kernels may not |
| 424 | have it. */ |
| 425 | #ifndef PTRACE_ARCH_PRCTL |
| 426 | #define PTRACE_ARCH_PRCTL 30 |
| 427 | #endif |
| 428 | /* FIXME: ezannoni-2003-07-09 see comment above about include |
| 429 | file order. We could be getting bogus values for these two. */ |
| 430 | gdb_assert (FS < ELF_NGREG); |
| 431 | gdb_assert (GS < ELF_NGREG); |
| 432 | switch (idx) |
| 433 | { |
| 434 | case FS: |
| 435 | if (ptrace (PTRACE_ARCH_PRCTL, lwpid, base, ARCH_GET_FS) == 0) |
| 436 | return PS_OK; |
| 437 | break; |
| 438 | case GS: |
| 439 | if (ptrace (PTRACE_ARCH_PRCTL, lwpid, base, ARCH_GET_GS) == 0) |
| 440 | return PS_OK; |
| 441 | break; |
| 442 | default: /* Should not happen. */ |
| 443 | return PS_BADADDR; |
| 444 | } |
| 445 | } |
| 446 | return PS_ERR; /* ptrace failed. */ |
| 447 | } |
| 448 | \f |
| 449 | |
| 450 | static void (*super_post_startup_inferior) (ptid_t ptid); |
| 451 | |
| 452 | static void |
| 453 | amd64_linux_child_post_startup_inferior (ptid_t ptid) |
| 454 | { |
| 455 | i386_cleanup_dregs (); |
| 456 | super_post_startup_inferior (ptid); |
| 457 | } |
| 458 | \f |
| 459 | |
| 460 | /* When GDB is built as a 64-bit application on linux, the |
| 461 | PTRACE_GETSIGINFO data is always presented in 64-bit layout. Since |
| 462 | debugging a 32-bit inferior with a 64-bit GDB should look the same |
| 463 | as debugging it with a 32-bit GDB, we do the 32-bit <-> 64-bit |
| 464 | conversion in-place ourselves. */ |
| 465 | |
| 466 | /* These types below (compat_*) define a siginfo type that is layout |
| 467 | compatible with the siginfo type exported by the 32-bit userspace |
| 468 | support. */ |
| 469 | |
| 470 | typedef int compat_int_t; |
| 471 | typedef unsigned int compat_uptr_t; |
| 472 | |
| 473 | typedef int compat_time_t; |
| 474 | typedef int compat_timer_t; |
| 475 | typedef int compat_clock_t; |
| 476 | |
| 477 | struct compat_timeval |
| 478 | { |
| 479 | compat_time_t tv_sec; |
| 480 | int tv_usec; |
| 481 | }; |
| 482 | |
| 483 | typedef union compat_sigval |
| 484 | { |
| 485 | compat_int_t sival_int; |
| 486 | compat_uptr_t sival_ptr; |
| 487 | } compat_sigval_t; |
| 488 | |
| 489 | typedef struct compat_siginfo |
| 490 | { |
| 491 | int si_signo; |
| 492 | int si_errno; |
| 493 | int si_code; |
| 494 | |
| 495 | union |
| 496 | { |
| 497 | int _pad[((128 / sizeof (int)) - 3)]; |
| 498 | |
| 499 | /* kill() */ |
| 500 | struct |
| 501 | { |
| 502 | unsigned int _pid; |
| 503 | unsigned int _uid; |
| 504 | } _kill; |
| 505 | |
| 506 | /* POSIX.1b timers */ |
| 507 | struct |
| 508 | { |
| 509 | compat_timer_t _tid; |
| 510 | int _overrun; |
| 511 | compat_sigval_t _sigval; |
| 512 | } _timer; |
| 513 | |
| 514 | /* POSIX.1b signals */ |
| 515 | struct |
| 516 | { |
| 517 | unsigned int _pid; |
| 518 | unsigned int _uid; |
| 519 | compat_sigval_t _sigval; |
| 520 | } _rt; |
| 521 | |
| 522 | /* SIGCHLD */ |
| 523 | struct |
| 524 | { |
| 525 | unsigned int _pid; |
| 526 | unsigned int _uid; |
| 527 | int _status; |
| 528 | compat_clock_t _utime; |
| 529 | compat_clock_t _stime; |
| 530 | } _sigchld; |
| 531 | |
| 532 | /* SIGILL, SIGFPE, SIGSEGV, SIGBUS */ |
| 533 | struct |
| 534 | { |
| 535 | unsigned int _addr; |
| 536 | } _sigfault; |
| 537 | |
| 538 | /* SIGPOLL */ |
| 539 | struct |
| 540 | { |
| 541 | int _band; |
| 542 | int _fd; |
| 543 | } _sigpoll; |
| 544 | } _sifields; |
| 545 | } compat_siginfo_t; |
| 546 | |
| 547 | #define cpt_si_pid _sifields._kill._pid |
| 548 | #define cpt_si_uid _sifields._kill._uid |
| 549 | #define cpt_si_timerid _sifields._timer._tid |
| 550 | #define cpt_si_overrun _sifields._timer._overrun |
| 551 | #define cpt_si_status _sifields._sigchld._status |
| 552 | #define cpt_si_utime _sifields._sigchld._utime |
| 553 | #define cpt_si_stime _sifields._sigchld._stime |
| 554 | #define cpt_si_ptr _sifields._rt._sigval.sival_ptr |
| 555 | #define cpt_si_addr _sifields._sigfault._addr |
| 556 | #define cpt_si_band _sifields._sigpoll._band |
| 557 | #define cpt_si_fd _sifields._sigpoll._fd |
| 558 | |
| 559 | /* glibc at least up to 2.3.2 doesn't have si_timerid, si_overrun. |
| 560 | In their place is si_timer1,si_timer2. */ |
| 561 | #ifndef si_timerid |
| 562 | #define si_timerid si_timer1 |
| 563 | #endif |
| 564 | #ifndef si_overrun |
| 565 | #define si_overrun si_timer2 |
| 566 | #endif |
| 567 | |
| 568 | static void |
| 569 | compat_siginfo_from_siginfo (compat_siginfo_t *to, siginfo_t *from) |
| 570 | { |
| 571 | memset (to, 0, sizeof (*to)); |
| 572 | |
| 573 | to->si_signo = from->si_signo; |
| 574 | to->si_errno = from->si_errno; |
| 575 | to->si_code = from->si_code; |
| 576 | |
| 577 | if (to->si_code == SI_TIMER) |
| 578 | { |
| 579 | to->cpt_si_timerid = from->si_timerid; |
| 580 | to->cpt_si_overrun = from->si_overrun; |
| 581 | to->cpt_si_ptr = (intptr_t) from->si_ptr; |
| 582 | } |
| 583 | else if (to->si_code == SI_USER) |
| 584 | { |
| 585 | to->cpt_si_pid = from->si_pid; |
| 586 | to->cpt_si_uid = from->si_uid; |
| 587 | } |
| 588 | else if (to->si_code < 0) |
| 589 | { |
| 590 | to->cpt_si_pid = from->si_pid; |
| 591 | to->cpt_si_uid = from->si_uid; |
| 592 | to->cpt_si_ptr = (intptr_t) from->si_ptr; |
| 593 | } |
| 594 | else |
| 595 | { |
| 596 | switch (to->si_signo) |
| 597 | { |
| 598 | case SIGCHLD: |
| 599 | to->cpt_si_pid = from->si_pid; |
| 600 | to->cpt_si_uid = from->si_uid; |
| 601 | to->cpt_si_status = from->si_status; |
| 602 | to->cpt_si_utime = from->si_utime; |
| 603 | to->cpt_si_stime = from->si_stime; |
| 604 | break; |
| 605 | case SIGILL: |
| 606 | case SIGFPE: |
| 607 | case SIGSEGV: |
| 608 | case SIGBUS: |
| 609 | to->cpt_si_addr = (intptr_t) from->si_addr; |
| 610 | break; |
| 611 | case SIGPOLL: |
| 612 | to->cpt_si_band = from->si_band; |
| 613 | to->cpt_si_fd = from->si_fd; |
| 614 | break; |
| 615 | default: |
| 616 | to->cpt_si_pid = from->si_pid; |
| 617 | to->cpt_si_uid = from->si_uid; |
| 618 | to->cpt_si_ptr = (intptr_t) from->si_ptr; |
| 619 | break; |
| 620 | } |
| 621 | } |
| 622 | } |
| 623 | |
| 624 | static void |
| 625 | siginfo_from_compat_siginfo (siginfo_t *to, compat_siginfo_t *from) |
| 626 | { |
| 627 | memset (to, 0, sizeof (*to)); |
| 628 | |
| 629 | to->si_signo = from->si_signo; |
| 630 | to->si_errno = from->si_errno; |
| 631 | to->si_code = from->si_code; |
| 632 | |
| 633 | if (to->si_code == SI_TIMER) |
| 634 | { |
| 635 | to->si_timerid = from->cpt_si_timerid; |
| 636 | to->si_overrun = from->cpt_si_overrun; |
| 637 | to->si_ptr = (void *) (intptr_t) from->cpt_si_ptr; |
| 638 | } |
| 639 | else if (to->si_code == SI_USER) |
| 640 | { |
| 641 | to->si_pid = from->cpt_si_pid; |
| 642 | to->si_uid = from->cpt_si_uid; |
| 643 | } |
| 644 | if (to->si_code < 0) |
| 645 | { |
| 646 | to->si_pid = from->cpt_si_pid; |
| 647 | to->si_uid = from->cpt_si_uid; |
| 648 | to->si_ptr = (void *) (intptr_t) from->cpt_si_ptr; |
| 649 | } |
| 650 | else |
| 651 | { |
| 652 | switch (to->si_signo) |
| 653 | { |
| 654 | case SIGCHLD: |
| 655 | to->si_pid = from->cpt_si_pid; |
| 656 | to->si_uid = from->cpt_si_uid; |
| 657 | to->si_status = from->cpt_si_status; |
| 658 | to->si_utime = from->cpt_si_utime; |
| 659 | to->si_stime = from->cpt_si_stime; |
| 660 | break; |
| 661 | case SIGILL: |
| 662 | case SIGFPE: |
| 663 | case SIGSEGV: |
| 664 | case SIGBUS: |
| 665 | to->si_addr = (void *) (intptr_t) from->cpt_si_addr; |
| 666 | break; |
| 667 | case SIGPOLL: |
| 668 | to->si_band = from->cpt_si_band; |
| 669 | to->si_fd = from->cpt_si_fd; |
| 670 | break; |
| 671 | default: |
| 672 | to->si_pid = from->cpt_si_pid; |
| 673 | to->si_uid = from->cpt_si_uid; |
| 674 | to->si_ptr = (void* ) (intptr_t) from->cpt_si_ptr; |
| 675 | break; |
| 676 | } |
| 677 | } |
| 678 | } |
| 679 | |
| 680 | /* Convert a native/host siginfo object, into/from the siginfo in the |
| 681 | layout of the inferiors' architecture. Returns true if any |
| 682 | conversion was done; false otherwise. If DIRECTION is 1, then copy |
| 683 | from INF to NATIVE. If DIRECTION is 0, copy from NATIVE to |
| 684 | INF. */ |
| 685 | |
| 686 | static int |
| 687 | amd64_linux_siginfo_fixup (struct siginfo *native, gdb_byte *inf, int direction) |
| 688 | { |
| 689 | /* Is the inferior 32-bit? If so, then do fixup the siginfo |
| 690 | object. */ |
| 691 | if (gdbarch_addr_bit (get_frame_arch (get_current_frame ())) == 32) |
| 692 | { |
| 693 | gdb_assert (sizeof (struct siginfo) == sizeof (compat_siginfo_t)); |
| 694 | |
| 695 | if (direction == 0) |
| 696 | compat_siginfo_from_siginfo ((struct compat_siginfo *) inf, native); |
| 697 | else |
| 698 | siginfo_from_compat_siginfo (native, (struct compat_siginfo *) inf); |
| 699 | |
| 700 | return 1; |
| 701 | } |
| 702 | else |
| 703 | return 0; |
| 704 | } |
| 705 | |
| 706 | /* Get Linux/x86 target description from running target. |
| 707 | |
| 708 | Value of CS segment register: |
| 709 | 1. 64bit process: 0x33. |
| 710 | 2. 32bit process: 0x23. |
| 711 | */ |
| 712 | |
| 713 | #define AMD64_LINUX_USER64_CS 0x33 |
| 714 | |
| 715 | static const struct target_desc * |
| 716 | amd64_linux_read_description (struct target_ops *ops) |
| 717 | { |
| 718 | unsigned long cs; |
| 719 | int tid; |
| 720 | int is_64bit; |
| 721 | static uint64_t xcr0; |
| 722 | |
| 723 | /* GNU/Linux LWP ID's are process ID's. */ |
| 724 | tid = TIDGET (inferior_ptid); |
| 725 | if (tid == 0) |
| 726 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ |
| 727 | |
| 728 | /* Get CS register. */ |
| 729 | errno = 0; |
| 730 | cs = ptrace (PTRACE_PEEKUSER, tid, |
| 731 | offsetof (struct user_regs_struct, cs), 0); |
| 732 | if (errno != 0) |
| 733 | perror_with_name (_("Couldn't get CS register")); |
| 734 | |
| 735 | is_64bit = cs == AMD64_LINUX_USER64_CS; |
| 736 | |
| 737 | if (have_ptrace_getregset == -1) |
| 738 | { |
| 739 | uint64_t xstateregs[(I386_XSTATE_SSE_SIZE / sizeof (uint64_t))]; |
| 740 | struct iovec iov; |
| 741 | |
| 742 | iov.iov_base = xstateregs; |
| 743 | iov.iov_len = sizeof (xstateregs); |
| 744 | |
| 745 | /* Check if PTRACE_GETREGSET works. */ |
| 746 | if (ptrace (PTRACE_GETREGSET, tid, |
| 747 | (unsigned int) NT_X86_XSTATE, (long) &iov) < 0) |
| 748 | have_ptrace_getregset = 0; |
| 749 | else |
| 750 | { |
| 751 | have_ptrace_getregset = 1; |
| 752 | |
| 753 | /* Get XCR0 from XSAVE extended state. */ |
| 754 | xcr0 = xstateregs[(I386_LINUX_XSAVE_XCR0_OFFSET |
| 755 | / sizeof (uint64_t))]; |
| 756 | } |
| 757 | } |
| 758 | |
| 759 | /* Check the native XCR0 only if PTRACE_GETREGSET is available. */ |
| 760 | if (have_ptrace_getregset |
| 761 | && (xcr0 & I386_XSTATE_AVX_MASK) == I386_XSTATE_AVX_MASK) |
| 762 | { |
| 763 | if (is_64bit) |
| 764 | return tdesc_amd64_avx_linux; |
| 765 | else |
| 766 | return tdesc_i386_avx_linux; |
| 767 | } |
| 768 | else |
| 769 | { |
| 770 | if (is_64bit) |
| 771 | return tdesc_amd64_linux; |
| 772 | else |
| 773 | return tdesc_i386_linux; |
| 774 | } |
| 775 | } |
| 776 | |
| 777 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
| 778 | void _initialize_amd64_linux_nat (void); |
| 779 | |
| 780 | void |
| 781 | _initialize_amd64_linux_nat (void) |
| 782 | { |
| 783 | struct target_ops *t; |
| 784 | |
| 785 | amd64_native_gregset32_reg_offset = amd64_linux_gregset32_reg_offset; |
| 786 | amd64_native_gregset32_num_regs = I386_LINUX_NUM_REGS; |
| 787 | amd64_native_gregset64_reg_offset = amd64_linux_gregset_reg_offset; |
| 788 | amd64_native_gregset64_num_regs = AMD64_LINUX_NUM_REGS; |
| 789 | |
| 790 | gdb_assert (ARRAY_SIZE (amd64_linux_gregset32_reg_offset) |
| 791 | == amd64_native_gregset32_num_regs); |
| 792 | |
| 793 | /* Fill in the generic GNU/Linux methods. */ |
| 794 | t = linux_target (); |
| 795 | |
| 796 | i386_use_watchpoints (t); |
| 797 | |
| 798 | i386_dr_low.set_control = amd64_linux_dr_set_control; |
| 799 | i386_dr_low.set_addr = amd64_linux_dr_set_addr; |
| 800 | i386_dr_low.reset_addr = amd64_linux_dr_reset_addr; |
| 801 | i386_dr_low.get_status = amd64_linux_dr_get_status; |
| 802 | i386_dr_low.unset_status = amd64_linux_dr_unset_status; |
| 803 | i386_set_debug_register_length (8); |
| 804 | |
| 805 | /* Override the GNU/Linux inferior startup hook. */ |
| 806 | super_post_startup_inferior = t->to_post_startup_inferior; |
| 807 | t->to_post_startup_inferior = amd64_linux_child_post_startup_inferior; |
| 808 | |
| 809 | /* Add our register access methods. */ |
| 810 | t->to_fetch_registers = amd64_linux_fetch_inferior_registers; |
| 811 | t->to_store_registers = amd64_linux_store_inferior_registers; |
| 812 | |
| 813 | t->to_read_description = amd64_linux_read_description; |
| 814 | |
| 815 | /* Register the target. */ |
| 816 | linux_nat_add_target (t); |
| 817 | linux_nat_set_new_thread (t, amd64_linux_new_thread); |
| 818 | linux_nat_set_siginfo_fixup (t, amd64_linux_siginfo_fixup); |
| 819 | } |