| 1 | /* Native-dependent code for GNU/Linux x86-64. |
| 2 | |
| 3 | Copyright (C) 2001-2014 Free Software Foundation, Inc. |
| 4 | Contributed by Jiri Smid, SuSE Labs. |
| 5 | |
| 6 | This file is part of GDB. |
| 7 | |
| 8 | This program is free software; you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation; either version 3 of the License, or |
| 11 | (at your option) any later version. |
| 12 | |
| 13 | This program is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 20 | |
| 21 | #include "defs.h" |
| 22 | #include "inferior.h" |
| 23 | #include "gdbcore.h" |
| 24 | #include "regcache.h" |
| 25 | #include "regset.h" |
| 26 | #include "linux-nat.h" |
| 27 | #include "amd64-linux-tdep.h" |
| 28 | #include "linux-btrace.h" |
| 29 | #include "btrace.h" |
| 30 | |
| 31 | #include "gdb_assert.h" |
| 32 | #include <string.h> |
| 33 | #include "elf/common.h" |
| 34 | #include <sys/uio.h> |
| 35 | #include <sys/ptrace.h> |
| 36 | #include <sys/debugreg.h> |
| 37 | #include <sys/syscall.h> |
| 38 | #include <sys/procfs.h> |
| 39 | #include <sys/user.h> |
| 40 | #include <asm/prctl.h> |
| 41 | /* FIXME ezannoni-2003-07-09: we need <sys/reg.h> to be included after |
| 42 | <asm/ptrace.h> because the latter redefines FS and GS for no apparent |
| 43 | reason, and those definitions don't match the ones that libpthread_db |
| 44 | uses, which come from <sys/reg.h>. */ |
| 45 | /* ezannoni-2003-07-09: I think this is fixed. The extraneous defs have |
| 46 | been removed from ptrace.h in the kernel. However, better safe than |
| 47 | sorry. */ |
| 48 | #include <asm/ptrace.h> |
| 49 | #include <sys/reg.h> |
| 50 | #include "gdb_proc_service.h" |
| 51 | |
| 52 | /* Prototypes for supply_gregset etc. */ |
| 53 | #include "gregset.h" |
| 54 | |
| 55 | #include "amd64-tdep.h" |
| 56 | #include "i386-linux-tdep.h" |
| 57 | #include "amd64-nat.h" |
| 58 | #include "i386-nat.h" |
| 59 | #include "i386-xstate.h" |
| 60 | |
| 61 | #ifndef PTRACE_GETREGSET |
| 62 | #define PTRACE_GETREGSET 0x4204 |
| 63 | #endif |
| 64 | |
| 65 | #ifndef PTRACE_SETREGSET |
| 66 | #define PTRACE_SETREGSET 0x4205 |
| 67 | #endif |
| 68 | |
| 69 | /* Per-thread arch-specific data we want to keep. */ |
| 70 | |
| 71 | struct arch_lwp_info |
| 72 | { |
| 73 | /* Non-zero if our copy differs from what's recorded in the thread. */ |
| 74 | int debug_registers_changed; |
| 75 | }; |
| 76 | |
| 77 | /* Does the current host support PTRACE_GETREGSET? */ |
| 78 | static int have_ptrace_getregset = -1; |
| 79 | |
| 80 | /* Mapping between the general-purpose registers in GNU/Linux x86-64 |
| 81 | `struct user' format and GDB's register cache layout for GNU/Linux |
| 82 | i386. |
| 83 | |
| 84 | Note that most GNU/Linux x86-64 registers are 64-bit, while the |
| 85 | GNU/Linux i386 registers are all 32-bit, but since we're |
| 86 | little-endian we get away with that. */ |
| 87 | |
| 88 | /* From <sys/reg.h> on GNU/Linux i386. */ |
| 89 | static int amd64_linux_gregset32_reg_offset[] = |
| 90 | { |
| 91 | RAX * 8, RCX * 8, /* %eax, %ecx */ |
| 92 | RDX * 8, RBX * 8, /* %edx, %ebx */ |
| 93 | RSP * 8, RBP * 8, /* %esp, %ebp */ |
| 94 | RSI * 8, RDI * 8, /* %esi, %edi */ |
| 95 | RIP * 8, EFLAGS * 8, /* %eip, %eflags */ |
| 96 | CS * 8, SS * 8, /* %cs, %ss */ |
| 97 | DS * 8, ES * 8, /* %ds, %es */ |
| 98 | FS * 8, GS * 8, /* %fs, %gs */ |
| 99 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 100 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 101 | -1, -1, -1, -1, -1, -1, -1, -1, -1, |
| 102 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 103 | -1, -1, -1, -1, /* MPX registers BND0 ... BND3. */ |
| 104 | -1, -1, /* MPX registers BNDCFGU, BNDSTATUS. */ |
| 105 | ORIG_RAX * 8, /* "orig_eax" */ |
| 106 | }; |
| 107 | \f |
| 108 | |
| 109 | /* Transfering the general-purpose registers between GDB, inferiors |
| 110 | and core files. */ |
| 111 | |
| 112 | /* Fill GDB's register cache with the general-purpose register values |
| 113 | in *GREGSETP. */ |
| 114 | |
| 115 | void |
| 116 | supply_gregset (struct regcache *regcache, const elf_gregset_t *gregsetp) |
| 117 | { |
| 118 | amd64_supply_native_gregset (regcache, gregsetp, -1); |
| 119 | } |
| 120 | |
| 121 | /* Fill register REGNUM (if it is a general-purpose register) in |
| 122 | *GREGSETP with the value in GDB's register cache. If REGNUM is -1, |
| 123 | do this for all registers. */ |
| 124 | |
| 125 | void |
| 126 | fill_gregset (const struct regcache *regcache, |
| 127 | elf_gregset_t *gregsetp, int regnum) |
| 128 | { |
| 129 | amd64_collect_native_gregset (regcache, gregsetp, regnum); |
| 130 | } |
| 131 | |
| 132 | /* Transfering floating-point registers between GDB, inferiors and cores. */ |
| 133 | |
| 134 | /* Fill GDB's register cache with the floating-point and SSE register |
| 135 | values in *FPREGSETP. */ |
| 136 | |
| 137 | void |
| 138 | supply_fpregset (struct regcache *regcache, const elf_fpregset_t *fpregsetp) |
| 139 | { |
| 140 | amd64_supply_fxsave (regcache, -1, fpregsetp); |
| 141 | } |
| 142 | |
| 143 | /* Fill register REGNUM (if it is a floating-point or SSE register) in |
| 144 | *FPREGSETP with the value in GDB's register cache. If REGNUM is |
| 145 | -1, do this for all registers. */ |
| 146 | |
| 147 | void |
| 148 | fill_fpregset (const struct regcache *regcache, |
| 149 | elf_fpregset_t *fpregsetp, int regnum) |
| 150 | { |
| 151 | amd64_collect_fxsave (regcache, regnum, fpregsetp); |
| 152 | } |
| 153 | \f |
| 154 | |
| 155 | /* Transferring arbitrary registers between GDB and inferior. */ |
| 156 | |
| 157 | /* Fetch register REGNUM from the child process. If REGNUM is -1, do |
| 158 | this for all registers (including the floating point and SSE |
| 159 | registers). */ |
| 160 | |
| 161 | static void |
| 162 | amd64_linux_fetch_inferior_registers (struct target_ops *ops, |
| 163 | struct regcache *regcache, int regnum) |
| 164 | { |
| 165 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 166 | int tid; |
| 167 | |
| 168 | /* GNU/Linux LWP ID's are process ID's. */ |
| 169 | tid = ptid_get_lwp (inferior_ptid); |
| 170 | if (tid == 0) |
| 171 | tid = ptid_get_pid (inferior_ptid); /* Not a threaded program. */ |
| 172 | |
| 173 | if (regnum == -1 || amd64_native_gregset_supplies_p (gdbarch, regnum)) |
| 174 | { |
| 175 | elf_gregset_t regs; |
| 176 | |
| 177 | if (ptrace (PTRACE_GETREGS, tid, 0, (long) ®s) < 0) |
| 178 | perror_with_name (_("Couldn't get registers")); |
| 179 | |
| 180 | amd64_supply_native_gregset (regcache, ®s, -1); |
| 181 | if (regnum != -1) |
| 182 | return; |
| 183 | } |
| 184 | |
| 185 | if (regnum == -1 || !amd64_native_gregset_supplies_p (gdbarch, regnum)) |
| 186 | { |
| 187 | elf_fpregset_t fpregs; |
| 188 | |
| 189 | if (have_ptrace_getregset) |
| 190 | { |
| 191 | char xstateregs[I386_XSTATE_MAX_SIZE]; |
| 192 | struct iovec iov; |
| 193 | |
| 194 | iov.iov_base = xstateregs; |
| 195 | iov.iov_len = sizeof (xstateregs); |
| 196 | if (ptrace (PTRACE_GETREGSET, tid, |
| 197 | (unsigned int) NT_X86_XSTATE, (long) &iov) < 0) |
| 198 | perror_with_name (_("Couldn't get extended state status")); |
| 199 | |
| 200 | amd64_supply_xsave (regcache, -1, xstateregs); |
| 201 | } |
| 202 | else |
| 203 | { |
| 204 | if (ptrace (PTRACE_GETFPREGS, tid, 0, (long) &fpregs) < 0) |
| 205 | perror_with_name (_("Couldn't get floating point status")); |
| 206 | |
| 207 | amd64_supply_fxsave (regcache, -1, &fpregs); |
| 208 | } |
| 209 | } |
| 210 | } |
| 211 | |
| 212 | /* Store register REGNUM back into the child process. If REGNUM is |
| 213 | -1, do this for all registers (including the floating-point and SSE |
| 214 | registers). */ |
| 215 | |
| 216 | static void |
| 217 | amd64_linux_store_inferior_registers (struct target_ops *ops, |
| 218 | struct regcache *regcache, int regnum) |
| 219 | { |
| 220 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 221 | int tid; |
| 222 | |
| 223 | /* GNU/Linux LWP ID's are process ID's. */ |
| 224 | tid = ptid_get_lwp (inferior_ptid); |
| 225 | if (tid == 0) |
| 226 | tid = ptid_get_pid (inferior_ptid); /* Not a threaded program. */ |
| 227 | |
| 228 | if (regnum == -1 || amd64_native_gregset_supplies_p (gdbarch, regnum)) |
| 229 | { |
| 230 | elf_gregset_t regs; |
| 231 | |
| 232 | if (ptrace (PTRACE_GETREGS, tid, 0, (long) ®s) < 0) |
| 233 | perror_with_name (_("Couldn't get registers")); |
| 234 | |
| 235 | amd64_collect_native_gregset (regcache, ®s, regnum); |
| 236 | |
| 237 | if (ptrace (PTRACE_SETREGS, tid, 0, (long) ®s) < 0) |
| 238 | perror_with_name (_("Couldn't write registers")); |
| 239 | |
| 240 | if (regnum != -1) |
| 241 | return; |
| 242 | } |
| 243 | |
| 244 | if (regnum == -1 || !amd64_native_gregset_supplies_p (gdbarch, regnum)) |
| 245 | { |
| 246 | elf_fpregset_t fpregs; |
| 247 | |
| 248 | if (have_ptrace_getregset) |
| 249 | { |
| 250 | char xstateregs[I386_XSTATE_MAX_SIZE]; |
| 251 | struct iovec iov; |
| 252 | |
| 253 | iov.iov_base = xstateregs; |
| 254 | iov.iov_len = sizeof (xstateregs); |
| 255 | if (ptrace (PTRACE_GETREGSET, tid, |
| 256 | (unsigned int) NT_X86_XSTATE, (long) &iov) < 0) |
| 257 | perror_with_name (_("Couldn't get extended state status")); |
| 258 | |
| 259 | amd64_collect_xsave (regcache, regnum, xstateregs, 0); |
| 260 | |
| 261 | if (ptrace (PTRACE_SETREGSET, tid, |
| 262 | (unsigned int) NT_X86_XSTATE, (long) &iov) < 0) |
| 263 | perror_with_name (_("Couldn't write extended state status")); |
| 264 | } |
| 265 | else |
| 266 | { |
| 267 | if (ptrace (PTRACE_GETFPREGS, tid, 0, (long) &fpregs) < 0) |
| 268 | perror_with_name (_("Couldn't get floating point status")); |
| 269 | |
| 270 | amd64_collect_fxsave (regcache, regnum, &fpregs); |
| 271 | |
| 272 | if (ptrace (PTRACE_SETFPREGS, tid, 0, (long) &fpregs) < 0) |
| 273 | perror_with_name (_("Couldn't write floating point status")); |
| 274 | } |
| 275 | } |
| 276 | } |
| 277 | \f |
| 278 | /* Support for debug registers. */ |
| 279 | |
| 280 | static unsigned long |
| 281 | amd64_linux_dr_get (ptid_t ptid, int regnum) |
| 282 | { |
| 283 | int tid; |
| 284 | unsigned long value; |
| 285 | |
| 286 | tid = ptid_get_lwp (ptid); |
| 287 | if (tid == 0) |
| 288 | tid = ptid_get_pid (ptid); |
| 289 | |
| 290 | errno = 0; |
| 291 | value = ptrace (PTRACE_PEEKUSER, tid, |
| 292 | offsetof (struct user, u_debugreg[regnum]), 0); |
| 293 | if (errno != 0) |
| 294 | perror_with_name (_("Couldn't read debug register")); |
| 295 | |
| 296 | return value; |
| 297 | } |
| 298 | |
| 299 | /* Set debug register REGNUM to VALUE in only the one LWP of PTID. */ |
| 300 | |
| 301 | static void |
| 302 | amd64_linux_dr_set (ptid_t ptid, int regnum, unsigned long value) |
| 303 | { |
| 304 | int tid; |
| 305 | |
| 306 | tid = ptid_get_lwp (ptid); |
| 307 | if (tid == 0) |
| 308 | tid = ptid_get_pid (ptid); |
| 309 | |
| 310 | errno = 0; |
| 311 | ptrace (PTRACE_POKEUSER, tid, |
| 312 | offsetof (struct user, u_debugreg[regnum]), value); |
| 313 | if (errno != 0) |
| 314 | perror_with_name (_("Couldn't write debug register")); |
| 315 | } |
| 316 | |
| 317 | /* Return the inferior's debug register REGNUM. */ |
| 318 | |
| 319 | static CORE_ADDR |
| 320 | amd64_linux_dr_get_addr (int regnum) |
| 321 | { |
| 322 | /* DR6 and DR7 are retrieved with some other way. */ |
| 323 | gdb_assert (DR_FIRSTADDR <= regnum && regnum <= DR_LASTADDR); |
| 324 | |
| 325 | return amd64_linux_dr_get (inferior_ptid, regnum); |
| 326 | } |
| 327 | |
| 328 | /* Return the inferior's DR7 debug control register. */ |
| 329 | |
| 330 | static unsigned long |
| 331 | amd64_linux_dr_get_control (void) |
| 332 | { |
| 333 | return amd64_linux_dr_get (inferior_ptid, DR_CONTROL); |
| 334 | } |
| 335 | |
| 336 | /* Get DR_STATUS from only the one LWP of INFERIOR_PTID. */ |
| 337 | |
| 338 | static unsigned long |
| 339 | amd64_linux_dr_get_status (void) |
| 340 | { |
| 341 | return amd64_linux_dr_get (inferior_ptid, DR_STATUS); |
| 342 | } |
| 343 | |
| 344 | /* Callback for iterate_over_lwps. Update the debug registers of |
| 345 | LWP. */ |
| 346 | |
| 347 | static int |
| 348 | update_debug_registers_callback (struct lwp_info *lwp, void *arg) |
| 349 | { |
| 350 | if (lwp->arch_private == NULL) |
| 351 | lwp->arch_private = XCNEW (struct arch_lwp_info); |
| 352 | |
| 353 | /* The actual update is done later just before resuming the lwp, we |
| 354 | just mark that the registers need updating. */ |
| 355 | lwp->arch_private->debug_registers_changed = 1; |
| 356 | |
| 357 | /* If the lwp isn't stopped, force it to momentarily pause, so we |
| 358 | can update its debug registers. */ |
| 359 | if (!lwp->stopped) |
| 360 | linux_stop_lwp (lwp); |
| 361 | |
| 362 | /* Continue the iteration. */ |
| 363 | return 0; |
| 364 | } |
| 365 | |
| 366 | /* Set DR_CONTROL to CONTROL in all LWPs of the current inferior. */ |
| 367 | |
| 368 | static void |
| 369 | amd64_linux_dr_set_control (unsigned long control) |
| 370 | { |
| 371 | ptid_t pid_ptid = pid_to_ptid (ptid_get_pid (inferior_ptid)); |
| 372 | |
| 373 | iterate_over_lwps (pid_ptid, update_debug_registers_callback, NULL); |
| 374 | } |
| 375 | |
| 376 | /* Set address REGNUM (zero based) to ADDR in all LWPs of the current |
| 377 | inferior. */ |
| 378 | |
| 379 | static void |
| 380 | amd64_linux_dr_set_addr (int regnum, CORE_ADDR addr) |
| 381 | { |
| 382 | ptid_t pid_ptid = pid_to_ptid (ptid_get_pid (inferior_ptid)); |
| 383 | |
| 384 | gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR); |
| 385 | |
| 386 | iterate_over_lwps (pid_ptid, update_debug_registers_callback, NULL); |
| 387 | } |
| 388 | |
| 389 | /* Called when resuming a thread. |
| 390 | If the debug regs have changed, update the thread's copies. */ |
| 391 | |
| 392 | static void |
| 393 | amd64_linux_prepare_to_resume (struct lwp_info *lwp) |
| 394 | { |
| 395 | int clear_status = 0; |
| 396 | |
| 397 | /* NULL means this is the main thread still going through the shell, |
| 398 | or, no watchpoint has been set yet. In that case, there's |
| 399 | nothing to do. */ |
| 400 | if (lwp->arch_private == NULL) |
| 401 | return; |
| 402 | |
| 403 | if (lwp->arch_private->debug_registers_changed) |
| 404 | { |
| 405 | struct i386_debug_reg_state *state |
| 406 | = i386_debug_reg_state (ptid_get_pid (lwp->ptid)); |
| 407 | int i; |
| 408 | |
| 409 | /* On Linux kernel before 2.6.33 commit |
| 410 | 72f674d203cd230426437cdcf7dd6f681dad8b0d |
| 411 | if you enable a breakpoint by the DR_CONTROL bits you need to have |
| 412 | already written the corresponding DR_FIRSTADDR...DR_LASTADDR registers. |
| 413 | |
| 414 | Ensure DR_CONTROL gets written as the very last register here. */ |
| 415 | |
| 416 | for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++) |
| 417 | if (state->dr_ref_count[i] > 0) |
| 418 | { |
| 419 | amd64_linux_dr_set (lwp->ptid, i, state->dr_mirror[i]); |
| 420 | |
| 421 | /* If we're setting a watchpoint, any change the inferior |
| 422 | had done itself to the debug registers needs to be |
| 423 | discarded, otherwise, i386_stopped_data_address can get |
| 424 | confused. */ |
| 425 | clear_status = 1; |
| 426 | } |
| 427 | |
| 428 | amd64_linux_dr_set (lwp->ptid, DR_CONTROL, state->dr_control_mirror); |
| 429 | |
| 430 | lwp->arch_private->debug_registers_changed = 0; |
| 431 | } |
| 432 | |
| 433 | if (clear_status || lwp->stopped_by_watchpoint) |
| 434 | amd64_linux_dr_set (lwp->ptid, DR_STATUS, 0); |
| 435 | } |
| 436 | |
| 437 | static void |
| 438 | amd64_linux_new_thread (struct lwp_info *lp) |
| 439 | { |
| 440 | struct arch_lwp_info *info = XCNEW (struct arch_lwp_info); |
| 441 | |
| 442 | info->debug_registers_changed = 1; |
| 443 | |
| 444 | lp->arch_private = info; |
| 445 | } |
| 446 | |
| 447 | /* linux_nat_new_fork hook. */ |
| 448 | |
| 449 | static void |
| 450 | amd64_linux_new_fork (struct lwp_info *parent, pid_t child_pid) |
| 451 | { |
| 452 | pid_t parent_pid; |
| 453 | struct i386_debug_reg_state *parent_state; |
| 454 | struct i386_debug_reg_state *child_state; |
| 455 | |
| 456 | /* NULL means no watchpoint has ever been set in the parent. In |
| 457 | that case, there's nothing to do. */ |
| 458 | if (parent->arch_private == NULL) |
| 459 | return; |
| 460 | |
| 461 | /* Linux kernel before 2.6.33 commit |
| 462 | 72f674d203cd230426437cdcf7dd6f681dad8b0d |
| 463 | will inherit hardware debug registers from parent |
| 464 | on fork/vfork/clone. Newer Linux kernels create such tasks with |
| 465 | zeroed debug registers. |
| 466 | |
| 467 | GDB core assumes the child inherits the watchpoints/hw |
| 468 | breakpoints of the parent, and will remove them all from the |
| 469 | forked off process. Copy the debug registers mirrors into the |
| 470 | new process so that all breakpoints and watchpoints can be |
| 471 | removed together. The debug registers mirror will become zeroed |
| 472 | in the end before detaching the forked off process, thus making |
| 473 | this compatible with older Linux kernels too. */ |
| 474 | |
| 475 | parent_pid = ptid_get_pid (parent->ptid); |
| 476 | parent_state = i386_debug_reg_state (parent_pid); |
| 477 | child_state = i386_debug_reg_state (child_pid); |
| 478 | *child_state = *parent_state; |
| 479 | } |
| 480 | |
| 481 | \f |
| 482 | |
| 483 | /* This function is called by libthread_db as part of its handling of |
| 484 | a request for a thread's local storage address. */ |
| 485 | |
| 486 | ps_err_e |
| 487 | ps_get_thread_area (const struct ps_prochandle *ph, |
| 488 | lwpid_t lwpid, int idx, void **base) |
| 489 | { |
| 490 | if (gdbarch_bfd_arch_info (target_gdbarch ())->bits_per_word == 32) |
| 491 | { |
| 492 | /* The full structure is found in <asm-i386/ldt.h>. The second |
| 493 | integer is the LDT's base_address and that is used to locate |
| 494 | the thread's local storage. See i386-linux-nat.c more |
| 495 | info. */ |
| 496 | unsigned int desc[4]; |
| 497 | |
| 498 | /* This code assumes that "int" is 32 bits and that |
| 499 | GET_THREAD_AREA returns no more than 4 int values. */ |
| 500 | gdb_assert (sizeof (int) == 4); |
| 501 | #ifndef PTRACE_GET_THREAD_AREA |
| 502 | #define PTRACE_GET_THREAD_AREA 25 |
| 503 | #endif |
| 504 | if (ptrace (PTRACE_GET_THREAD_AREA, |
| 505 | lwpid, (void *) (long) idx, (unsigned long) &desc) < 0) |
| 506 | return PS_ERR; |
| 507 | |
| 508 | /* Extend the value to 64 bits. Here it's assumed that a "long" |
| 509 | and a "void *" are the same. */ |
| 510 | (*base) = (void *) (long) desc[1]; |
| 511 | return PS_OK; |
| 512 | } |
| 513 | else |
| 514 | { |
| 515 | /* This definition comes from prctl.h, but some kernels may not |
| 516 | have it. */ |
| 517 | #ifndef PTRACE_ARCH_PRCTL |
| 518 | #define PTRACE_ARCH_PRCTL 30 |
| 519 | #endif |
| 520 | /* FIXME: ezannoni-2003-07-09 see comment above about include |
| 521 | file order. We could be getting bogus values for these two. */ |
| 522 | gdb_assert (FS < ELF_NGREG); |
| 523 | gdb_assert (GS < ELF_NGREG); |
| 524 | switch (idx) |
| 525 | { |
| 526 | case FS: |
| 527 | #ifdef HAVE_STRUCT_USER_REGS_STRUCT_FS_BASE |
| 528 | { |
| 529 | /* PTRACE_ARCH_PRCTL is obsolete since 2.6.25, where the |
| 530 | fs_base and gs_base fields of user_regs_struct can be |
| 531 | used directly. */ |
| 532 | unsigned long fs; |
| 533 | errno = 0; |
| 534 | fs = ptrace (PTRACE_PEEKUSER, lwpid, |
| 535 | offsetof (struct user_regs_struct, fs_base), 0); |
| 536 | if (errno == 0) |
| 537 | { |
| 538 | *base = (void *) fs; |
| 539 | return PS_OK; |
| 540 | } |
| 541 | } |
| 542 | #endif |
| 543 | if (ptrace (PTRACE_ARCH_PRCTL, lwpid, base, ARCH_GET_FS) == 0) |
| 544 | return PS_OK; |
| 545 | break; |
| 546 | case GS: |
| 547 | #ifdef HAVE_STRUCT_USER_REGS_STRUCT_GS_BASE |
| 548 | { |
| 549 | unsigned long gs; |
| 550 | errno = 0; |
| 551 | gs = ptrace (PTRACE_PEEKUSER, lwpid, |
| 552 | offsetof (struct user_regs_struct, gs_base), 0); |
| 553 | if (errno == 0) |
| 554 | { |
| 555 | *base = (void *) gs; |
| 556 | return PS_OK; |
| 557 | } |
| 558 | } |
| 559 | #endif |
| 560 | if (ptrace (PTRACE_ARCH_PRCTL, lwpid, base, ARCH_GET_GS) == 0) |
| 561 | return PS_OK; |
| 562 | break; |
| 563 | default: /* Should not happen. */ |
| 564 | return PS_BADADDR; |
| 565 | } |
| 566 | } |
| 567 | return PS_ERR; /* ptrace failed. */ |
| 568 | } |
| 569 | \f |
| 570 | |
| 571 | static void (*super_post_startup_inferior) (struct target_ops *self, |
| 572 | ptid_t ptid); |
| 573 | |
| 574 | static void |
| 575 | amd64_linux_child_post_startup_inferior (struct target_ops *self, ptid_t ptid) |
| 576 | { |
| 577 | i386_cleanup_dregs (); |
| 578 | super_post_startup_inferior (self, ptid); |
| 579 | } |
| 580 | \f |
| 581 | |
| 582 | /* When GDB is built as a 64-bit application on linux, the |
| 583 | PTRACE_GETSIGINFO data is always presented in 64-bit layout. Since |
| 584 | debugging a 32-bit inferior with a 64-bit GDB should look the same |
| 585 | as debugging it with a 32-bit GDB, we do the 32-bit <-> 64-bit |
| 586 | conversion in-place ourselves. */ |
| 587 | |
| 588 | /* These types below (compat_*) define a siginfo type that is layout |
| 589 | compatible with the siginfo type exported by the 32-bit userspace |
| 590 | support. */ |
| 591 | |
| 592 | typedef int compat_int_t; |
| 593 | typedef unsigned int compat_uptr_t; |
| 594 | |
| 595 | typedef int compat_time_t; |
| 596 | typedef int compat_timer_t; |
| 597 | typedef int compat_clock_t; |
| 598 | |
| 599 | struct compat_timeval |
| 600 | { |
| 601 | compat_time_t tv_sec; |
| 602 | int tv_usec; |
| 603 | }; |
| 604 | |
| 605 | typedef union compat_sigval |
| 606 | { |
| 607 | compat_int_t sival_int; |
| 608 | compat_uptr_t sival_ptr; |
| 609 | } compat_sigval_t; |
| 610 | |
| 611 | typedef struct compat_siginfo |
| 612 | { |
| 613 | int si_signo; |
| 614 | int si_errno; |
| 615 | int si_code; |
| 616 | |
| 617 | union |
| 618 | { |
| 619 | int _pad[((128 / sizeof (int)) - 3)]; |
| 620 | |
| 621 | /* kill() */ |
| 622 | struct |
| 623 | { |
| 624 | unsigned int _pid; |
| 625 | unsigned int _uid; |
| 626 | } _kill; |
| 627 | |
| 628 | /* POSIX.1b timers */ |
| 629 | struct |
| 630 | { |
| 631 | compat_timer_t _tid; |
| 632 | int _overrun; |
| 633 | compat_sigval_t _sigval; |
| 634 | } _timer; |
| 635 | |
| 636 | /* POSIX.1b signals */ |
| 637 | struct |
| 638 | { |
| 639 | unsigned int _pid; |
| 640 | unsigned int _uid; |
| 641 | compat_sigval_t _sigval; |
| 642 | } _rt; |
| 643 | |
| 644 | /* SIGCHLD */ |
| 645 | struct |
| 646 | { |
| 647 | unsigned int _pid; |
| 648 | unsigned int _uid; |
| 649 | int _status; |
| 650 | compat_clock_t _utime; |
| 651 | compat_clock_t _stime; |
| 652 | } _sigchld; |
| 653 | |
| 654 | /* SIGILL, SIGFPE, SIGSEGV, SIGBUS */ |
| 655 | struct |
| 656 | { |
| 657 | unsigned int _addr; |
| 658 | } _sigfault; |
| 659 | |
| 660 | /* SIGPOLL */ |
| 661 | struct |
| 662 | { |
| 663 | int _band; |
| 664 | int _fd; |
| 665 | } _sigpoll; |
| 666 | } _sifields; |
| 667 | } compat_siginfo_t; |
| 668 | |
| 669 | /* For x32, clock_t in _sigchld is 64bit aligned at 4 bytes. */ |
| 670 | typedef struct compat_x32_clock |
| 671 | { |
| 672 | int lower; |
| 673 | int upper; |
| 674 | } compat_x32_clock_t; |
| 675 | |
| 676 | typedef struct compat_x32_siginfo |
| 677 | { |
| 678 | int si_signo; |
| 679 | int si_errno; |
| 680 | int si_code; |
| 681 | |
| 682 | union |
| 683 | { |
| 684 | int _pad[((128 / sizeof (int)) - 3)]; |
| 685 | |
| 686 | /* kill() */ |
| 687 | struct |
| 688 | { |
| 689 | unsigned int _pid; |
| 690 | unsigned int _uid; |
| 691 | } _kill; |
| 692 | |
| 693 | /* POSIX.1b timers */ |
| 694 | struct |
| 695 | { |
| 696 | compat_timer_t _tid; |
| 697 | int _overrun; |
| 698 | compat_sigval_t _sigval; |
| 699 | } _timer; |
| 700 | |
| 701 | /* POSIX.1b signals */ |
| 702 | struct |
| 703 | { |
| 704 | unsigned int _pid; |
| 705 | unsigned int _uid; |
| 706 | compat_sigval_t _sigval; |
| 707 | } _rt; |
| 708 | |
| 709 | /* SIGCHLD */ |
| 710 | struct |
| 711 | { |
| 712 | unsigned int _pid; |
| 713 | unsigned int _uid; |
| 714 | int _status; |
| 715 | compat_x32_clock_t _utime; |
| 716 | compat_x32_clock_t _stime; |
| 717 | } _sigchld; |
| 718 | |
| 719 | /* SIGILL, SIGFPE, SIGSEGV, SIGBUS */ |
| 720 | struct |
| 721 | { |
| 722 | unsigned int _addr; |
| 723 | } _sigfault; |
| 724 | |
| 725 | /* SIGPOLL */ |
| 726 | struct |
| 727 | { |
| 728 | int _band; |
| 729 | int _fd; |
| 730 | } _sigpoll; |
| 731 | } _sifields; |
| 732 | } compat_x32_siginfo_t; |
| 733 | |
| 734 | #define cpt_si_pid _sifields._kill._pid |
| 735 | #define cpt_si_uid _sifields._kill._uid |
| 736 | #define cpt_si_timerid _sifields._timer._tid |
| 737 | #define cpt_si_overrun _sifields._timer._overrun |
| 738 | #define cpt_si_status _sifields._sigchld._status |
| 739 | #define cpt_si_utime _sifields._sigchld._utime |
| 740 | #define cpt_si_stime _sifields._sigchld._stime |
| 741 | #define cpt_si_ptr _sifields._rt._sigval.sival_ptr |
| 742 | #define cpt_si_addr _sifields._sigfault._addr |
| 743 | #define cpt_si_band _sifields._sigpoll._band |
| 744 | #define cpt_si_fd _sifields._sigpoll._fd |
| 745 | |
| 746 | /* glibc at least up to 2.3.2 doesn't have si_timerid, si_overrun. |
| 747 | In their place is si_timer1,si_timer2. */ |
| 748 | #ifndef si_timerid |
| 749 | #define si_timerid si_timer1 |
| 750 | #endif |
| 751 | #ifndef si_overrun |
| 752 | #define si_overrun si_timer2 |
| 753 | #endif |
| 754 | |
| 755 | static void |
| 756 | compat_siginfo_from_siginfo (compat_siginfo_t *to, siginfo_t *from) |
| 757 | { |
| 758 | memset (to, 0, sizeof (*to)); |
| 759 | |
| 760 | to->si_signo = from->si_signo; |
| 761 | to->si_errno = from->si_errno; |
| 762 | to->si_code = from->si_code; |
| 763 | |
| 764 | if (to->si_code == SI_TIMER) |
| 765 | { |
| 766 | to->cpt_si_timerid = from->si_timerid; |
| 767 | to->cpt_si_overrun = from->si_overrun; |
| 768 | to->cpt_si_ptr = (intptr_t) from->si_ptr; |
| 769 | } |
| 770 | else if (to->si_code == SI_USER) |
| 771 | { |
| 772 | to->cpt_si_pid = from->si_pid; |
| 773 | to->cpt_si_uid = from->si_uid; |
| 774 | } |
| 775 | else if (to->si_code < 0) |
| 776 | { |
| 777 | to->cpt_si_pid = from->si_pid; |
| 778 | to->cpt_si_uid = from->si_uid; |
| 779 | to->cpt_si_ptr = (intptr_t) from->si_ptr; |
| 780 | } |
| 781 | else |
| 782 | { |
| 783 | switch (to->si_signo) |
| 784 | { |
| 785 | case SIGCHLD: |
| 786 | to->cpt_si_pid = from->si_pid; |
| 787 | to->cpt_si_uid = from->si_uid; |
| 788 | to->cpt_si_status = from->si_status; |
| 789 | to->cpt_si_utime = from->si_utime; |
| 790 | to->cpt_si_stime = from->si_stime; |
| 791 | break; |
| 792 | case SIGILL: |
| 793 | case SIGFPE: |
| 794 | case SIGSEGV: |
| 795 | case SIGBUS: |
| 796 | to->cpt_si_addr = (intptr_t) from->si_addr; |
| 797 | break; |
| 798 | case SIGPOLL: |
| 799 | to->cpt_si_band = from->si_band; |
| 800 | to->cpt_si_fd = from->si_fd; |
| 801 | break; |
| 802 | default: |
| 803 | to->cpt_si_pid = from->si_pid; |
| 804 | to->cpt_si_uid = from->si_uid; |
| 805 | to->cpt_si_ptr = (intptr_t) from->si_ptr; |
| 806 | break; |
| 807 | } |
| 808 | } |
| 809 | } |
| 810 | |
| 811 | static void |
| 812 | siginfo_from_compat_siginfo (siginfo_t *to, compat_siginfo_t *from) |
| 813 | { |
| 814 | memset (to, 0, sizeof (*to)); |
| 815 | |
| 816 | to->si_signo = from->si_signo; |
| 817 | to->si_errno = from->si_errno; |
| 818 | to->si_code = from->si_code; |
| 819 | |
| 820 | if (to->si_code == SI_TIMER) |
| 821 | { |
| 822 | to->si_timerid = from->cpt_si_timerid; |
| 823 | to->si_overrun = from->cpt_si_overrun; |
| 824 | to->si_ptr = (void *) (intptr_t) from->cpt_si_ptr; |
| 825 | } |
| 826 | else if (to->si_code == SI_USER) |
| 827 | { |
| 828 | to->si_pid = from->cpt_si_pid; |
| 829 | to->si_uid = from->cpt_si_uid; |
| 830 | } |
| 831 | if (to->si_code < 0) |
| 832 | { |
| 833 | to->si_pid = from->cpt_si_pid; |
| 834 | to->si_uid = from->cpt_si_uid; |
| 835 | to->si_ptr = (void *) (intptr_t) from->cpt_si_ptr; |
| 836 | } |
| 837 | else |
| 838 | { |
| 839 | switch (to->si_signo) |
| 840 | { |
| 841 | case SIGCHLD: |
| 842 | to->si_pid = from->cpt_si_pid; |
| 843 | to->si_uid = from->cpt_si_uid; |
| 844 | to->si_status = from->cpt_si_status; |
| 845 | to->si_utime = from->cpt_si_utime; |
| 846 | to->si_stime = from->cpt_si_stime; |
| 847 | break; |
| 848 | case SIGILL: |
| 849 | case SIGFPE: |
| 850 | case SIGSEGV: |
| 851 | case SIGBUS: |
| 852 | to->si_addr = (void *) (intptr_t) from->cpt_si_addr; |
| 853 | break; |
| 854 | case SIGPOLL: |
| 855 | to->si_band = from->cpt_si_band; |
| 856 | to->si_fd = from->cpt_si_fd; |
| 857 | break; |
| 858 | default: |
| 859 | to->si_pid = from->cpt_si_pid; |
| 860 | to->si_uid = from->cpt_si_uid; |
| 861 | to->si_ptr = (void* ) (intptr_t) from->cpt_si_ptr; |
| 862 | break; |
| 863 | } |
| 864 | } |
| 865 | } |
| 866 | |
| 867 | static void |
| 868 | compat_x32_siginfo_from_siginfo (compat_x32_siginfo_t *to, |
| 869 | siginfo_t *from) |
| 870 | { |
| 871 | memset (to, 0, sizeof (*to)); |
| 872 | |
| 873 | to->si_signo = from->si_signo; |
| 874 | to->si_errno = from->si_errno; |
| 875 | to->si_code = from->si_code; |
| 876 | |
| 877 | if (to->si_code == SI_TIMER) |
| 878 | { |
| 879 | to->cpt_si_timerid = from->si_timerid; |
| 880 | to->cpt_si_overrun = from->si_overrun; |
| 881 | to->cpt_si_ptr = (intptr_t) from->si_ptr; |
| 882 | } |
| 883 | else if (to->si_code == SI_USER) |
| 884 | { |
| 885 | to->cpt_si_pid = from->si_pid; |
| 886 | to->cpt_si_uid = from->si_uid; |
| 887 | } |
| 888 | else if (to->si_code < 0) |
| 889 | { |
| 890 | to->cpt_si_pid = from->si_pid; |
| 891 | to->cpt_si_uid = from->si_uid; |
| 892 | to->cpt_si_ptr = (intptr_t) from->si_ptr; |
| 893 | } |
| 894 | else |
| 895 | { |
| 896 | switch (to->si_signo) |
| 897 | { |
| 898 | case SIGCHLD: |
| 899 | to->cpt_si_pid = from->si_pid; |
| 900 | to->cpt_si_uid = from->si_uid; |
| 901 | to->cpt_si_status = from->si_status; |
| 902 | memcpy (&to->cpt_si_utime, &from->si_utime, |
| 903 | sizeof (to->cpt_si_utime)); |
| 904 | memcpy (&to->cpt_si_stime, &from->si_stime, |
| 905 | sizeof (to->cpt_si_stime)); |
| 906 | break; |
| 907 | case SIGILL: |
| 908 | case SIGFPE: |
| 909 | case SIGSEGV: |
| 910 | case SIGBUS: |
| 911 | to->cpt_si_addr = (intptr_t) from->si_addr; |
| 912 | break; |
| 913 | case SIGPOLL: |
| 914 | to->cpt_si_band = from->si_band; |
| 915 | to->cpt_si_fd = from->si_fd; |
| 916 | break; |
| 917 | default: |
| 918 | to->cpt_si_pid = from->si_pid; |
| 919 | to->cpt_si_uid = from->si_uid; |
| 920 | to->cpt_si_ptr = (intptr_t) from->si_ptr; |
| 921 | break; |
| 922 | } |
| 923 | } |
| 924 | } |
| 925 | |
| 926 | static void |
| 927 | siginfo_from_compat_x32_siginfo (siginfo_t *to, |
| 928 | compat_x32_siginfo_t *from) |
| 929 | { |
| 930 | memset (to, 0, sizeof (*to)); |
| 931 | |
| 932 | to->si_signo = from->si_signo; |
| 933 | to->si_errno = from->si_errno; |
| 934 | to->si_code = from->si_code; |
| 935 | |
| 936 | if (to->si_code == SI_TIMER) |
| 937 | { |
| 938 | to->si_timerid = from->cpt_si_timerid; |
| 939 | to->si_overrun = from->cpt_si_overrun; |
| 940 | to->si_ptr = (void *) (intptr_t) from->cpt_si_ptr; |
| 941 | } |
| 942 | else if (to->si_code == SI_USER) |
| 943 | { |
| 944 | to->si_pid = from->cpt_si_pid; |
| 945 | to->si_uid = from->cpt_si_uid; |
| 946 | } |
| 947 | if (to->si_code < 0) |
| 948 | { |
| 949 | to->si_pid = from->cpt_si_pid; |
| 950 | to->si_uid = from->cpt_si_uid; |
| 951 | to->si_ptr = (void *) (intptr_t) from->cpt_si_ptr; |
| 952 | } |
| 953 | else |
| 954 | { |
| 955 | switch (to->si_signo) |
| 956 | { |
| 957 | case SIGCHLD: |
| 958 | to->si_pid = from->cpt_si_pid; |
| 959 | to->si_uid = from->cpt_si_uid; |
| 960 | to->si_status = from->cpt_si_status; |
| 961 | memcpy (&to->si_utime, &from->cpt_si_utime, |
| 962 | sizeof (to->si_utime)); |
| 963 | memcpy (&to->si_stime, &from->cpt_si_stime, |
| 964 | sizeof (to->si_stime)); |
| 965 | break; |
| 966 | case SIGILL: |
| 967 | case SIGFPE: |
| 968 | case SIGSEGV: |
| 969 | case SIGBUS: |
| 970 | to->si_addr = (void *) (intptr_t) from->cpt_si_addr; |
| 971 | break; |
| 972 | case SIGPOLL: |
| 973 | to->si_band = from->cpt_si_band; |
| 974 | to->si_fd = from->cpt_si_fd; |
| 975 | break; |
| 976 | default: |
| 977 | to->si_pid = from->cpt_si_pid; |
| 978 | to->si_uid = from->cpt_si_uid; |
| 979 | to->si_ptr = (void* ) (intptr_t) from->cpt_si_ptr; |
| 980 | break; |
| 981 | } |
| 982 | } |
| 983 | } |
| 984 | |
| 985 | /* Convert a native/host siginfo object, into/from the siginfo in the |
| 986 | layout of the inferiors' architecture. Returns true if any |
| 987 | conversion was done; false otherwise. If DIRECTION is 1, then copy |
| 988 | from INF to NATIVE. If DIRECTION is 0, copy from NATIVE to |
| 989 | INF. */ |
| 990 | |
| 991 | static int |
| 992 | amd64_linux_siginfo_fixup (siginfo_t *native, gdb_byte *inf, int direction) |
| 993 | { |
| 994 | struct gdbarch *gdbarch = get_frame_arch (get_current_frame ()); |
| 995 | |
| 996 | /* Is the inferior 32-bit? If so, then do fixup the siginfo |
| 997 | object. */ |
| 998 | if (gdbarch_bfd_arch_info (gdbarch)->bits_per_word == 32) |
| 999 | { |
| 1000 | gdb_assert (sizeof (siginfo_t) == sizeof (compat_siginfo_t)); |
| 1001 | |
| 1002 | if (direction == 0) |
| 1003 | compat_siginfo_from_siginfo ((struct compat_siginfo *) inf, native); |
| 1004 | else |
| 1005 | siginfo_from_compat_siginfo (native, (struct compat_siginfo *) inf); |
| 1006 | |
| 1007 | return 1; |
| 1008 | } |
| 1009 | /* No fixup for native x32 GDB. */ |
| 1010 | else if (gdbarch_addr_bit (gdbarch) == 32 && sizeof (void *) == 8) |
| 1011 | { |
| 1012 | gdb_assert (sizeof (siginfo_t) == sizeof (compat_x32_siginfo_t)); |
| 1013 | |
| 1014 | if (direction == 0) |
| 1015 | compat_x32_siginfo_from_siginfo ((struct compat_x32_siginfo *) inf, |
| 1016 | native); |
| 1017 | else |
| 1018 | siginfo_from_compat_x32_siginfo (native, |
| 1019 | (struct compat_x32_siginfo *) inf); |
| 1020 | |
| 1021 | return 1; |
| 1022 | } |
| 1023 | else |
| 1024 | return 0; |
| 1025 | } |
| 1026 | |
| 1027 | /* Get Linux/x86 target description from running target. |
| 1028 | |
| 1029 | Value of CS segment register: |
| 1030 | 1. 64bit process: 0x33. |
| 1031 | 2. 32bit process: 0x23. |
| 1032 | |
| 1033 | Value of DS segment register: |
| 1034 | 1. LP64 process: 0x0. |
| 1035 | 2. X32 process: 0x2b. |
| 1036 | */ |
| 1037 | |
| 1038 | #define AMD64_LINUX_USER64_CS 0x33 |
| 1039 | #define AMD64_LINUX_X32_DS 0x2b |
| 1040 | |
| 1041 | static const struct target_desc * |
| 1042 | amd64_linux_read_description (struct target_ops *ops) |
| 1043 | { |
| 1044 | unsigned long cs; |
| 1045 | unsigned long ds; |
| 1046 | int tid; |
| 1047 | int is_64bit; |
| 1048 | int is_x32; |
| 1049 | static uint64_t xcr0; |
| 1050 | |
| 1051 | /* GNU/Linux LWP ID's are process ID's. */ |
| 1052 | tid = ptid_get_lwp (inferior_ptid); |
| 1053 | if (tid == 0) |
| 1054 | tid = ptid_get_pid (inferior_ptid); /* Not a threaded program. */ |
| 1055 | |
| 1056 | /* Get CS register. */ |
| 1057 | errno = 0; |
| 1058 | cs = ptrace (PTRACE_PEEKUSER, tid, |
| 1059 | offsetof (struct user_regs_struct, cs), 0); |
| 1060 | if (errno != 0) |
| 1061 | perror_with_name (_("Couldn't get CS register")); |
| 1062 | |
| 1063 | is_64bit = cs == AMD64_LINUX_USER64_CS; |
| 1064 | |
| 1065 | /* Get DS register. */ |
| 1066 | errno = 0; |
| 1067 | ds = ptrace (PTRACE_PEEKUSER, tid, |
| 1068 | offsetof (struct user_regs_struct, ds), 0); |
| 1069 | if (errno != 0) |
| 1070 | perror_with_name (_("Couldn't get DS register")); |
| 1071 | |
| 1072 | is_x32 = ds == AMD64_LINUX_X32_DS; |
| 1073 | |
| 1074 | if (sizeof (void *) == 4 && is_64bit && !is_x32) |
| 1075 | error (_("Can't debug 64-bit process with 32-bit GDB")); |
| 1076 | |
| 1077 | if (have_ptrace_getregset == -1) |
| 1078 | { |
| 1079 | uint64_t xstateregs[(I386_XSTATE_SSE_SIZE / sizeof (uint64_t))]; |
| 1080 | struct iovec iov; |
| 1081 | |
| 1082 | iov.iov_base = xstateregs; |
| 1083 | iov.iov_len = sizeof (xstateregs); |
| 1084 | |
| 1085 | /* Check if PTRACE_GETREGSET works. */ |
| 1086 | if (ptrace (PTRACE_GETREGSET, tid, |
| 1087 | (unsigned int) NT_X86_XSTATE, (long) &iov) < 0) |
| 1088 | have_ptrace_getregset = 0; |
| 1089 | else |
| 1090 | { |
| 1091 | have_ptrace_getregset = 1; |
| 1092 | |
| 1093 | /* Get XCR0 from XSAVE extended state. */ |
| 1094 | xcr0 = xstateregs[(I386_LINUX_XSAVE_XCR0_OFFSET |
| 1095 | / sizeof (uint64_t))]; |
| 1096 | } |
| 1097 | } |
| 1098 | |
| 1099 | /* Check the native XCR0 only if PTRACE_GETREGSET is available. */ |
| 1100 | if (have_ptrace_getregset && (xcr0 & I386_XSTATE_ALL_MASK)) |
| 1101 | { |
| 1102 | switch (xcr0 & I386_XSTATE_ALL_MASK) |
| 1103 | { |
| 1104 | case I386_XSTATE_MPX_MASK: |
| 1105 | if (is_64bit) |
| 1106 | { |
| 1107 | if (is_x32) |
| 1108 | return tdesc_x32_avx_linux; /* No MPX on x32 using AVX. */ |
| 1109 | else |
| 1110 | return tdesc_amd64_mpx_linux; |
| 1111 | } |
| 1112 | else |
| 1113 | return tdesc_i386_mpx_linux; |
| 1114 | case I386_XSTATE_AVX_MASK: |
| 1115 | if (is_64bit) |
| 1116 | { |
| 1117 | if (is_x32) |
| 1118 | return tdesc_x32_avx_linux; |
| 1119 | else |
| 1120 | return tdesc_amd64_avx_linux; |
| 1121 | } |
| 1122 | else |
| 1123 | return tdesc_i386_avx_linux; |
| 1124 | default: |
| 1125 | if (is_64bit) |
| 1126 | { |
| 1127 | if (is_x32) |
| 1128 | return tdesc_x32_linux; |
| 1129 | else |
| 1130 | return tdesc_amd64_linux; |
| 1131 | } |
| 1132 | else |
| 1133 | return tdesc_i386_linux; |
| 1134 | } |
| 1135 | } |
| 1136 | else |
| 1137 | { |
| 1138 | if (is_64bit) |
| 1139 | { |
| 1140 | if (is_x32) |
| 1141 | return tdesc_x32_linux; |
| 1142 | else |
| 1143 | return tdesc_amd64_linux; |
| 1144 | } |
| 1145 | else |
| 1146 | return tdesc_i386_linux; |
| 1147 | } |
| 1148 | } |
| 1149 | |
| 1150 | /* Enable branch tracing. */ |
| 1151 | |
| 1152 | static struct btrace_target_info * |
| 1153 | amd64_linux_enable_btrace (struct target_ops *self, ptid_t ptid) |
| 1154 | { |
| 1155 | struct btrace_target_info *tinfo; |
| 1156 | struct gdbarch *gdbarch; |
| 1157 | |
| 1158 | errno = 0; |
| 1159 | tinfo = linux_enable_btrace (ptid); |
| 1160 | |
| 1161 | if (tinfo == NULL) |
| 1162 | error (_("Could not enable branch tracing for %s: %s."), |
| 1163 | target_pid_to_str (ptid), safe_strerror (errno)); |
| 1164 | |
| 1165 | /* Fill in the size of a pointer in bits. */ |
| 1166 | gdbarch = target_thread_architecture (ptid); |
| 1167 | tinfo->ptr_bits = gdbarch_ptr_bit (gdbarch); |
| 1168 | |
| 1169 | return tinfo; |
| 1170 | } |
| 1171 | |
| 1172 | /* Disable branch tracing. */ |
| 1173 | |
| 1174 | static void |
| 1175 | amd64_linux_disable_btrace (struct target_ops *self, |
| 1176 | struct btrace_target_info *tinfo) |
| 1177 | { |
| 1178 | enum btrace_error errcode = linux_disable_btrace (tinfo); |
| 1179 | |
| 1180 | if (errcode != BTRACE_ERR_NONE) |
| 1181 | error (_("Could not disable branch tracing.")); |
| 1182 | } |
| 1183 | |
| 1184 | /* Teardown branch tracing. */ |
| 1185 | |
| 1186 | static void |
| 1187 | amd64_linux_teardown_btrace (struct target_ops *self, |
| 1188 | struct btrace_target_info *tinfo) |
| 1189 | { |
| 1190 | /* Ignore errors. */ |
| 1191 | linux_disable_btrace (tinfo); |
| 1192 | } |
| 1193 | |
| 1194 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
| 1195 | void _initialize_amd64_linux_nat (void); |
| 1196 | |
| 1197 | void |
| 1198 | _initialize_amd64_linux_nat (void) |
| 1199 | { |
| 1200 | struct target_ops *t; |
| 1201 | |
| 1202 | amd64_native_gregset32_reg_offset = amd64_linux_gregset32_reg_offset; |
| 1203 | amd64_native_gregset32_num_regs = I386_LINUX_NUM_REGS; |
| 1204 | amd64_native_gregset64_reg_offset = amd64_linux_gregset_reg_offset; |
| 1205 | amd64_native_gregset64_num_regs = AMD64_LINUX_NUM_REGS; |
| 1206 | |
| 1207 | gdb_assert (ARRAY_SIZE (amd64_linux_gregset32_reg_offset) |
| 1208 | == amd64_native_gregset32_num_regs); |
| 1209 | |
| 1210 | /* Fill in the generic GNU/Linux methods. */ |
| 1211 | t = linux_target (); |
| 1212 | |
| 1213 | i386_use_watchpoints (t); |
| 1214 | |
| 1215 | i386_dr_low.set_control = amd64_linux_dr_set_control; |
| 1216 | i386_dr_low.set_addr = amd64_linux_dr_set_addr; |
| 1217 | i386_dr_low.get_addr = amd64_linux_dr_get_addr; |
| 1218 | i386_dr_low.get_status = amd64_linux_dr_get_status; |
| 1219 | i386_dr_low.get_control = amd64_linux_dr_get_control; |
| 1220 | i386_set_debug_register_length (8); |
| 1221 | |
| 1222 | /* Override the GNU/Linux inferior startup hook. */ |
| 1223 | super_post_startup_inferior = t->to_post_startup_inferior; |
| 1224 | t->to_post_startup_inferior = amd64_linux_child_post_startup_inferior; |
| 1225 | |
| 1226 | /* Add our register access methods. */ |
| 1227 | t->to_fetch_registers = amd64_linux_fetch_inferior_registers; |
| 1228 | t->to_store_registers = amd64_linux_store_inferior_registers; |
| 1229 | |
| 1230 | t->to_read_description = amd64_linux_read_description; |
| 1231 | |
| 1232 | /* Add btrace methods. */ |
| 1233 | t->to_supports_btrace = linux_supports_btrace; |
| 1234 | t->to_enable_btrace = amd64_linux_enable_btrace; |
| 1235 | t->to_disable_btrace = amd64_linux_disable_btrace; |
| 1236 | t->to_teardown_btrace = amd64_linux_teardown_btrace; |
| 1237 | t->to_read_btrace = linux_read_btrace; |
| 1238 | |
| 1239 | /* Register the target. */ |
| 1240 | linux_nat_add_target (t); |
| 1241 | linux_nat_set_new_thread (t, amd64_linux_new_thread); |
| 1242 | linux_nat_set_new_fork (t, amd64_linux_new_fork); |
| 1243 | linux_nat_set_forget_process (t, i386_forget_process); |
| 1244 | linux_nat_set_siginfo_fixup (t, amd64_linux_siginfo_fixup); |
| 1245 | linux_nat_set_prepare_to_resume (t, amd64_linux_prepare_to_resume); |
| 1246 | } |