| 1 | /* Native-dependent code for GNU/Linux x86-64. |
| 2 | |
| 3 | Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 |
| 4 | 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 "linux-nat.h" |
| 27 | #include "amd64-linux-tdep.h" |
| 28 | |
| 29 | #include "gdb_assert.h" |
| 30 | #include "gdb_string.h" |
| 31 | #include <sys/ptrace.h> |
| 32 | #include <sys/debugreg.h> |
| 33 | #include <sys/syscall.h> |
| 34 | #include <sys/procfs.h> |
| 35 | #include <asm/prctl.h> |
| 36 | /* FIXME ezannoni-2003-07-09: we need <sys/reg.h> to be included after |
| 37 | <asm/ptrace.h> because the latter redefines FS and GS for no apparent |
| 38 | reason, and those definitions don't match the ones that libpthread_db |
| 39 | uses, which come from <sys/reg.h>. */ |
| 40 | /* ezannoni-2003-07-09: I think this is fixed. The extraneous defs have |
| 41 | been removed from ptrace.h in the kernel. However, better safe than |
| 42 | sorry. */ |
| 43 | #include <asm/ptrace.h> |
| 44 | #include <sys/reg.h> |
| 45 | #include "gdb_proc_service.h" |
| 46 | |
| 47 | /* Prototypes for supply_gregset etc. */ |
| 48 | #include "gregset.h" |
| 49 | |
| 50 | #include "amd64-tdep.h" |
| 51 | #include "i386-linux-tdep.h" |
| 52 | #include "amd64-nat.h" |
| 53 | |
| 54 | /* Mapping between the general-purpose registers in GNU/Linux x86-64 |
| 55 | `struct user' format and GDB's register cache layout. */ |
| 56 | |
| 57 | static int amd64_linux_gregset64_reg_offset[] = |
| 58 | { |
| 59 | RAX * 8, RBX * 8, /* %rax, %rbx */ |
| 60 | RCX * 8, RDX * 8, /* %rcx, %rdx */ |
| 61 | RSI * 8, RDI * 8, /* %rsi, %rdi */ |
| 62 | RBP * 8, RSP * 8, /* %rbp, %rsp */ |
| 63 | R8 * 8, R9 * 8, /* %r8 ... */ |
| 64 | R10 * 8, R11 * 8, |
| 65 | R12 * 8, R13 * 8, |
| 66 | R14 * 8, R15 * 8, /* ... %r15 */ |
| 67 | RIP * 8, EFLAGS * 8, /* %rip, %eflags */ |
| 68 | CS * 8, SS * 8, /* %cs, %ss */ |
| 69 | DS * 8, ES * 8, /* %ds, %es */ |
| 70 | FS * 8, GS * 8, /* %fs, %gs */ |
| 71 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 72 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 73 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 74 | -1, -1, -1, -1, -1, -1, -1, -1, -1, |
| 75 | ORIG_RAX * 8 |
| 76 | }; |
| 77 | \f |
| 78 | |
| 79 | /* Mapping between the general-purpose registers in GNU/Linux x86-64 |
| 80 | `struct user' format and GDB's register cache layout for GNU/Linux |
| 81 | i386. |
| 82 | |
| 83 | Note that most GNU/Linux x86-64 registers are 64-bit, while the |
| 84 | GNU/Linux i386 registers are all 32-bit, but since we're |
| 85 | little-endian we get away with that. */ |
| 86 | |
| 87 | /* From <sys/reg.h> on GNU/Linux i386. */ |
| 88 | static int amd64_linux_gregset32_reg_offset[] = |
| 89 | { |
| 90 | RAX * 8, RCX * 8, /* %eax, %ecx */ |
| 91 | RDX * 8, RBX * 8, /* %edx, %ebx */ |
| 92 | RSP * 8, RBP * 8, /* %esp, %ebp */ |
| 93 | RSI * 8, RDI * 8, /* %esi, %edi */ |
| 94 | RIP * 8, EFLAGS * 8, /* %eip, %eflags */ |
| 95 | CS * 8, SS * 8, /* %cs, %ss */ |
| 96 | DS * 8, ES * 8, /* %ds, %es */ |
| 97 | FS * 8, GS * 8, /* %fs, %gs */ |
| 98 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 99 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 100 | -1, -1, -1, -1, -1, -1, -1, -1, -1, |
| 101 | ORIG_RAX * 8 /* "orig_eax" */ |
| 102 | }; |
| 103 | \f |
| 104 | |
| 105 | /* Transfering the general-purpose registers between GDB, inferiors |
| 106 | and core files. */ |
| 107 | |
| 108 | /* Fill GDB's register cache with the general-purpose register values |
| 109 | in *GREGSETP. */ |
| 110 | |
| 111 | void |
| 112 | supply_gregset (struct regcache *regcache, const elf_gregset_t *gregsetp) |
| 113 | { |
| 114 | amd64_supply_native_gregset (regcache, gregsetp, -1); |
| 115 | } |
| 116 | |
| 117 | /* Fill register REGNUM (if it is a general-purpose register) in |
| 118 | *GREGSETP with the value in GDB's register cache. If REGNUM is -1, |
| 119 | do this for all registers. */ |
| 120 | |
| 121 | void |
| 122 | fill_gregset (const struct regcache *regcache, |
| 123 | elf_gregset_t *gregsetp, int regnum) |
| 124 | { |
| 125 | amd64_collect_native_gregset (regcache, gregsetp, regnum); |
| 126 | } |
| 127 | |
| 128 | /* Transfering floating-point registers between GDB, inferiors and cores. */ |
| 129 | |
| 130 | /* Fill GDB's register cache with the floating-point and SSE register |
| 131 | values in *FPREGSETP. */ |
| 132 | |
| 133 | void |
| 134 | supply_fpregset (struct regcache *regcache, const elf_fpregset_t *fpregsetp) |
| 135 | { |
| 136 | amd64_supply_fxsave (regcache, -1, fpregsetp); |
| 137 | } |
| 138 | |
| 139 | /* Fill register REGNUM (if it is a floating-point or SSE register) in |
| 140 | *FPREGSETP with the value in GDB's register cache. If REGNUM is |
| 141 | -1, do this for all registers. */ |
| 142 | |
| 143 | void |
| 144 | fill_fpregset (const struct regcache *regcache, |
| 145 | elf_fpregset_t *fpregsetp, int regnum) |
| 146 | { |
| 147 | amd64_collect_fxsave (regcache, regnum, fpregsetp); |
| 148 | } |
| 149 | \f |
| 150 | |
| 151 | /* Transferring arbitrary registers between GDB and inferior. */ |
| 152 | |
| 153 | /* Fetch register REGNUM from the child process. If REGNUM is -1, do |
| 154 | this for all registers (including the floating point and SSE |
| 155 | registers). */ |
| 156 | |
| 157 | static void |
| 158 | amd64_linux_fetch_inferior_registers (struct regcache *regcache, int regnum) |
| 159 | { |
| 160 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 161 | int tid; |
| 162 | |
| 163 | /* GNU/Linux LWP ID's are process ID's. */ |
| 164 | tid = TIDGET (inferior_ptid); |
| 165 | if (tid == 0) |
| 166 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ |
| 167 | |
| 168 | if (regnum == -1 || amd64_native_gregset_supplies_p (gdbarch, regnum)) |
| 169 | { |
| 170 | elf_gregset_t regs; |
| 171 | |
| 172 | if (ptrace (PTRACE_GETREGS, tid, 0, (long) ®s) < 0) |
| 173 | perror_with_name (_("Couldn't get registers")); |
| 174 | |
| 175 | amd64_supply_native_gregset (regcache, ®s, -1); |
| 176 | if (regnum != -1) |
| 177 | return; |
| 178 | } |
| 179 | |
| 180 | if (regnum == -1 || !amd64_native_gregset_supplies_p (gdbarch, regnum)) |
| 181 | { |
| 182 | elf_fpregset_t fpregs; |
| 183 | |
| 184 | if (ptrace (PTRACE_GETFPREGS, tid, 0, (long) &fpregs) < 0) |
| 185 | perror_with_name (_("Couldn't get floating point status")); |
| 186 | |
| 187 | amd64_supply_fxsave (regcache, -1, &fpregs); |
| 188 | } |
| 189 | } |
| 190 | |
| 191 | /* Store register REGNUM back into the child process. If REGNUM is |
| 192 | -1, do this for all registers (including the floating-point and SSE |
| 193 | registers). */ |
| 194 | |
| 195 | static void |
| 196 | amd64_linux_store_inferior_registers (struct regcache *regcache, int regnum) |
| 197 | { |
| 198 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 199 | int tid; |
| 200 | |
| 201 | /* GNU/Linux LWP ID's are process ID's. */ |
| 202 | tid = TIDGET (inferior_ptid); |
| 203 | if (tid == 0) |
| 204 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ |
| 205 | |
| 206 | if (regnum == -1 || amd64_native_gregset_supplies_p (gdbarch, regnum)) |
| 207 | { |
| 208 | elf_gregset_t regs; |
| 209 | |
| 210 | if (ptrace (PTRACE_GETREGS, tid, 0, (long) ®s) < 0) |
| 211 | perror_with_name (_("Couldn't get registers")); |
| 212 | |
| 213 | amd64_collect_native_gregset (regcache, ®s, regnum); |
| 214 | |
| 215 | if (ptrace (PTRACE_SETREGS, tid, 0, (long) ®s) < 0) |
| 216 | perror_with_name (_("Couldn't write registers")); |
| 217 | |
| 218 | if (regnum != -1) |
| 219 | return; |
| 220 | } |
| 221 | |
| 222 | if (regnum == -1 || !amd64_native_gregset_supplies_p (gdbarch, regnum)) |
| 223 | { |
| 224 | elf_fpregset_t fpregs; |
| 225 | |
| 226 | if (ptrace (PTRACE_GETFPREGS, tid, 0, (long) &fpregs) < 0) |
| 227 | perror_with_name (_("Couldn't get floating point status")); |
| 228 | |
| 229 | amd64_collect_fxsave (regcache, regnum, &fpregs); |
| 230 | |
| 231 | if (ptrace (PTRACE_SETFPREGS, tid, 0, (long) &fpregs) < 0) |
| 232 | perror_with_name (_("Couldn't write floating point status")); |
| 233 | |
| 234 | return; |
| 235 | } |
| 236 | } |
| 237 | \f |
| 238 | /* Support for debug registers. */ |
| 239 | |
| 240 | static unsigned long amd64_linux_dr[DR_CONTROL + 1]; |
| 241 | |
| 242 | static unsigned long |
| 243 | amd64_linux_dr_get (ptid_t ptid, int regnum) |
| 244 | { |
| 245 | int tid; |
| 246 | unsigned long value; |
| 247 | |
| 248 | tid = TIDGET (ptid); |
| 249 | if (tid == 0) |
| 250 | tid = PIDGET (ptid); |
| 251 | |
| 252 | /* FIXME: kettenis/2001-03-27: Calling perror_with_name if the |
| 253 | ptrace call fails breaks debugging remote targets. The correct |
| 254 | way to fix this is to add the hardware breakpoint and watchpoint |
| 255 | stuff to the target vector. For now, just return zero if the |
| 256 | ptrace call fails. */ |
| 257 | errno = 0; |
| 258 | value = ptrace (PTRACE_PEEKUSER, tid, |
| 259 | offsetof (struct user, u_debugreg[regnum]), 0); |
| 260 | if (errno != 0) |
| 261 | #if 0 |
| 262 | perror_with_name (_("Couldn't read debug register")); |
| 263 | #else |
| 264 | return 0; |
| 265 | #endif |
| 266 | |
| 267 | return value; |
| 268 | } |
| 269 | |
| 270 | static void |
| 271 | amd64_linux_dr_set (ptid_t ptid, int regnum, unsigned long value) |
| 272 | { |
| 273 | int tid; |
| 274 | |
| 275 | tid = TIDGET (ptid); |
| 276 | if (tid == 0) |
| 277 | tid = PIDGET (ptid); |
| 278 | |
| 279 | errno = 0; |
| 280 | ptrace (PTRACE_POKEUSER, tid, |
| 281 | offsetof (struct user, u_debugreg[regnum]), value); |
| 282 | if (errno != 0) |
| 283 | perror_with_name (_("Couldn't write debug register")); |
| 284 | } |
| 285 | |
| 286 | void |
| 287 | amd64_linux_dr_set_control (unsigned long control) |
| 288 | { |
| 289 | struct lwp_info *lp; |
| 290 | ptid_t ptid; |
| 291 | |
| 292 | amd64_linux_dr[DR_CONTROL] = control; |
| 293 | ALL_LWPS (lp, ptid) |
| 294 | amd64_linux_dr_set (ptid, DR_CONTROL, control); |
| 295 | } |
| 296 | |
| 297 | void |
| 298 | amd64_linux_dr_set_addr (int regnum, CORE_ADDR addr) |
| 299 | { |
| 300 | struct lwp_info *lp; |
| 301 | ptid_t ptid; |
| 302 | |
| 303 | gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR); |
| 304 | |
| 305 | amd64_linux_dr[DR_FIRSTADDR + regnum] = addr; |
| 306 | ALL_LWPS (lp, ptid) |
| 307 | amd64_linux_dr_set (ptid, DR_FIRSTADDR + regnum, addr); |
| 308 | } |
| 309 | |
| 310 | void |
| 311 | amd64_linux_dr_reset_addr (int regnum) |
| 312 | { |
| 313 | amd64_linux_dr_set_addr (regnum, 0); |
| 314 | } |
| 315 | |
| 316 | unsigned long |
| 317 | amd64_linux_dr_get_status (void) |
| 318 | { |
| 319 | return amd64_linux_dr_get (inferior_ptid, DR_STATUS); |
| 320 | } |
| 321 | |
| 322 | static void |
| 323 | amd64_linux_new_thread (ptid_t ptid) |
| 324 | { |
| 325 | int i; |
| 326 | |
| 327 | for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++) |
| 328 | amd64_linux_dr_set (ptid, i, amd64_linux_dr[i]); |
| 329 | |
| 330 | amd64_linux_dr_set (ptid, DR_CONTROL, amd64_linux_dr[DR_CONTROL]); |
| 331 | } |
| 332 | \f |
| 333 | |
| 334 | /* This function is called by libthread_db as part of its handling of |
| 335 | a request for a thread's local storage address. */ |
| 336 | |
| 337 | ps_err_e |
| 338 | ps_get_thread_area (const struct ps_prochandle *ph, |
| 339 | lwpid_t lwpid, int idx, void **base) |
| 340 | { |
| 341 | if (gdbarch_ptr_bit (current_gdbarch) == 32) |
| 342 | { |
| 343 | /* The full structure is found in <asm-i386/ldt.h>. The second |
| 344 | integer is the LDT's base_address and that is used to locate |
| 345 | the thread's local storage. See i386-linux-nat.c more |
| 346 | info. */ |
| 347 | unsigned int desc[4]; |
| 348 | |
| 349 | /* This code assumes that "int" is 32 bits and that |
| 350 | GET_THREAD_AREA returns no more than 4 int values. */ |
| 351 | gdb_assert (sizeof (int) == 4); |
| 352 | #ifndef PTRACE_GET_THREAD_AREA |
| 353 | #define PTRACE_GET_THREAD_AREA 25 |
| 354 | #endif |
| 355 | if (ptrace (PTRACE_GET_THREAD_AREA, |
| 356 | lwpid, (void *) (long) idx, (unsigned long) &desc) < 0) |
| 357 | return PS_ERR; |
| 358 | |
| 359 | /* Extend the value to 64 bits. Here it's assumed that a "long" |
| 360 | and a "void *" are the same. */ |
| 361 | (*base) = (void *) (long) desc[1]; |
| 362 | return PS_OK; |
| 363 | } |
| 364 | else |
| 365 | { |
| 366 | /* This definition comes from prctl.h, but some kernels may not |
| 367 | have it. */ |
| 368 | #ifndef PTRACE_ARCH_PRCTL |
| 369 | #define PTRACE_ARCH_PRCTL 30 |
| 370 | #endif |
| 371 | /* FIXME: ezannoni-2003-07-09 see comment above about include |
| 372 | file order. We could be getting bogus values for these two. */ |
| 373 | gdb_assert (FS < ELF_NGREG); |
| 374 | gdb_assert (GS < ELF_NGREG); |
| 375 | switch (idx) |
| 376 | { |
| 377 | case FS: |
| 378 | if (ptrace (PTRACE_ARCH_PRCTL, lwpid, base, ARCH_GET_FS) == 0) |
| 379 | return PS_OK; |
| 380 | break; |
| 381 | case GS: |
| 382 | if (ptrace (PTRACE_ARCH_PRCTL, lwpid, base, ARCH_GET_GS) == 0) |
| 383 | return PS_OK; |
| 384 | break; |
| 385 | default: /* Should not happen. */ |
| 386 | return PS_BADADDR; |
| 387 | } |
| 388 | } |
| 389 | return PS_ERR; /* ptrace failed. */ |
| 390 | } |
| 391 | \f |
| 392 | |
| 393 | static void (*super_post_startup_inferior) (ptid_t ptid); |
| 394 | |
| 395 | static void |
| 396 | amd64_linux_child_post_startup_inferior (ptid_t ptid) |
| 397 | { |
| 398 | i386_cleanup_dregs (); |
| 399 | super_post_startup_inferior (ptid); |
| 400 | } |
| 401 | \f |
| 402 | |
| 403 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
| 404 | void _initialize_amd64_linux_nat (void); |
| 405 | |
| 406 | void |
| 407 | _initialize_amd64_linux_nat (void) |
| 408 | { |
| 409 | struct target_ops *t; |
| 410 | |
| 411 | amd64_native_gregset32_reg_offset = amd64_linux_gregset32_reg_offset; |
| 412 | amd64_native_gregset32_num_regs = I386_LINUX_NUM_REGS; |
| 413 | amd64_native_gregset64_reg_offset = amd64_linux_gregset64_reg_offset; |
| 414 | amd64_native_gregset64_num_regs = AMD64_LINUX_NUM_REGS; |
| 415 | |
| 416 | gdb_assert (ARRAY_SIZE (amd64_linux_gregset32_reg_offset) |
| 417 | == amd64_native_gregset32_num_regs); |
| 418 | gdb_assert (ARRAY_SIZE (amd64_linux_gregset64_reg_offset) |
| 419 | == amd64_native_gregset64_num_regs); |
| 420 | |
| 421 | /* Fill in the generic GNU/Linux methods. */ |
| 422 | t = linux_target (); |
| 423 | |
| 424 | i386_use_watchpoints (t); |
| 425 | |
| 426 | /* Override the GNU/Linux inferior startup hook. */ |
| 427 | super_post_startup_inferior = t->to_post_startup_inferior; |
| 428 | t->to_post_startup_inferior = amd64_linux_child_post_startup_inferior; |
| 429 | |
| 430 | /* Add our register access methods. */ |
| 431 | t->to_fetch_registers = amd64_linux_fetch_inferior_registers; |
| 432 | t->to_store_registers = amd64_linux_store_inferior_registers; |
| 433 | |
| 434 | /* Register the target. */ |
| 435 | linux_nat_add_target (t); |
| 436 | linux_nat_set_new_thread (t, amd64_linux_new_thread); |
| 437 | } |