| 1 | /* Native-dependent code for GNU/Linux x86-64. |
| 2 | |
| 3 | Copyright 2001, 2002, 2003 Free Software Foundation, Inc. |
| 4 | |
| 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 2 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, write to the Free Software |
| 21 | Foundation, Inc., 59 Temple Place - Suite 330, |
| 22 | Boston, MA 02111-1307, USA. */ |
| 23 | |
| 24 | #include "defs.h" |
| 25 | #include "inferior.h" |
| 26 | #include "gdbcore.h" |
| 27 | #include "regcache.h" |
| 28 | #include "linux-nat.h" |
| 29 | |
| 30 | #include "gdb_assert.h" |
| 31 | #include "gdb_string.h" |
| 32 | #include <sys/ptrace.h> |
| 33 | #include <sys/debugreg.h> |
| 34 | #include <sys/syscall.h> |
| 35 | #include <sys/procfs.h> |
| 36 | #include <asm/prctl.h> |
| 37 | /* FIXME ezannoni-2003-07-09: we need <sys/reg.h> to be included after |
| 38 | <asm/ptrace.h> because the latter redefines FS and GS for no apparent |
| 39 | reason, and those definitions don't match the ones that libpthread_db |
| 40 | uses, which come from <sys/reg.h>. */ |
| 41 | /* ezannoni-2003-07-09: I think this is fixed. The extraneous defs have |
| 42 | been removed from ptrace.h in the kernel. However, better safe than |
| 43 | sorry. */ |
| 44 | #include <asm/ptrace.h> |
| 45 | #include <sys/reg.h> |
| 46 | #include "gdb_proc_service.h" |
| 47 | |
| 48 | /* Prototypes for supply_gregset etc. */ |
| 49 | #include "gregset.h" |
| 50 | |
| 51 | #include "x86-64-tdep.h" |
| 52 | #include "x86-64-linux-tdep.h" |
| 53 | #include "i386-linux-tdep.h" |
| 54 | #include "amd64-nat.h" |
| 55 | |
| 56 | /* Mapping between the general-purpose registers in GNU/Linux x86-64 |
| 57 | `struct user' format and GDB's register cache layout. */ |
| 58 | |
| 59 | static int x86_64_linux_gregset64_reg_offset[] = |
| 60 | { |
| 61 | RAX * 8, RBX * 8, /* %rax, %rbx */ |
| 62 | RCX * 8, RDX * 8, /* %rcx, %rdx */ |
| 63 | RSI * 8, RDI * 8, /* %rsi, %rdi */ |
| 64 | RBP * 8, RSP * 8, /* %rbp, %rsp */ |
| 65 | R8 * 8, R9 * 8, /* %r8 ... */ |
| 66 | R10 * 8, R11 * 8, |
| 67 | R12 * 8, R13 * 8, |
| 68 | R14 * 8, R15 * 8, /* ... %r15 */ |
| 69 | RIP * 8, EFLAGS * 8, /* %rip, %eflags */ |
| 70 | DS * 8, ES * 8, /* %ds, %es */ |
| 71 | FS * 8, GS * 8 /* %fs, %gs */ |
| 72 | }; |
| 73 | \f |
| 74 | |
| 75 | /* Mapping between the general-purpose registers in GNU/Linux x86-64 |
| 76 | `struct user' format and GDB's register cache layout for GNU/Linux |
| 77 | i386. |
| 78 | |
| 79 | Note that most GNU/Linux x86-64 registers are 64-bit, while the |
| 80 | GNU/Linux i386 registers are all 32-bit, but since we're |
| 81 | little-endian we get away with that. */ |
| 82 | |
| 83 | /* From <sys/reg.h> on GNU/Linux i386. */ |
| 84 | static int x86_64_linux_gregset32_reg_offset[] = |
| 85 | { |
| 86 | 10 * 8, 11 * 8, /* %eax, %ecx */ |
| 87 | 12 * 8, 13 * 8, /* %edx, %ebx */ |
| 88 | 19 * 8, 4 * 8, /* %esp, %ebp */ |
| 89 | 13 * 8, 14 * 8, /* %esi, %edi */ |
| 90 | 16 * 8, 18 * 8, /* %eip, %eflags */ |
| 91 | 17 * 8, 20 * 8, /* %cs, %ss */ |
| 92 | 23 * 8, 24 * 8, /* %ds, %es */ |
| 93 | 25 * 4, 26 * 4, /* %fs, %gs */ |
| 94 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 95 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 96 | -1, -1, -1, -1, -1, -1, -1, -1, -1, |
| 97 | 15 * 8 /* "orig_eax" */ |
| 98 | }; |
| 99 | |
| 100 | /* Which ptrace request retrieves which registers? |
| 101 | These apply to the corresponding SET requests as well. */ |
| 102 | |
| 103 | #define GETFPREGS_SUPPLIES(regno) \ |
| 104 | (FP0_REGNUM <= (regno) && (regno) <= MXCSR_REGNUM) |
| 105 | \f |
| 106 | |
| 107 | /* Transfering the general-purpose registers between GDB, inferiors |
| 108 | and core files. */ |
| 109 | |
| 110 | /* Fill GDB's register cache with the general-purpose register values |
| 111 | in *GREGSETP. */ |
| 112 | |
| 113 | void |
| 114 | supply_gregset (elf_gregset_t *gregsetp) |
| 115 | { |
| 116 | amd64_supply_native_gregset (current_regcache, gregsetp, -1); |
| 117 | } |
| 118 | |
| 119 | /* Fill register REGNUM (if it is a general-purpose register) in |
| 120 | *GREGSETP with the value in GDB's register cache. If REGNUM is -1, |
| 121 | do this for all registers. */ |
| 122 | |
| 123 | void |
| 124 | fill_gregset (elf_gregset_t *gregsetp, int regnum) |
| 125 | { |
| 126 | amd64_collect_native_gregset (current_regcache, gregsetp, regnum); |
| 127 | } |
| 128 | |
| 129 | /* Fetch all general-purpose registers from process/thread TID and |
| 130 | store their values in GDB's register cache. */ |
| 131 | |
| 132 | static void |
| 133 | fetch_regs (int tid) |
| 134 | { |
| 135 | elf_gregset_t regs; |
| 136 | |
| 137 | if (ptrace (PTRACE_GETREGS, tid, 0, (long) ®s) < 0) |
| 138 | perror_with_name ("Couldn't get registers"); |
| 139 | |
| 140 | supply_gregset (®s); |
| 141 | } |
| 142 | |
| 143 | /* Store all valid general-purpose registers in GDB's register cache |
| 144 | into the process/thread specified by TID. */ |
| 145 | |
| 146 | static void |
| 147 | store_regs (int tid, int regnum) |
| 148 | { |
| 149 | elf_gregset_t regs; |
| 150 | |
| 151 | if (ptrace (PTRACE_GETREGS, tid, 0, (long) ®s) < 0) |
| 152 | perror_with_name ("Couldn't get registers"); |
| 153 | |
| 154 | fill_gregset (®s, regnum); |
| 155 | |
| 156 | if (ptrace (PTRACE_SETREGS, tid, 0, (long) ®s) < 0) |
| 157 | perror_with_name ("Couldn't write registers"); |
| 158 | } |
| 159 | \f |
| 160 | |
| 161 | /* Transfering floating-point registers between GDB, inferiors and cores. */ |
| 162 | |
| 163 | /* Fill GDB's register cache with the floating-point and SSE register |
| 164 | values in *FPREGSETP. */ |
| 165 | |
| 166 | void |
| 167 | supply_fpregset (elf_fpregset_t *fpregsetp) |
| 168 | { |
| 169 | x86_64_supply_fxsave ((const char *) fpregsetp, -1); |
| 170 | } |
| 171 | |
| 172 | /* Fill register REGNUM (if it is a floating-point or SSE register) in |
| 173 | *FPREGSETP with the value in GDB's register cache. If REGNUM is |
| 174 | -1, do this for all registers. */ |
| 175 | |
| 176 | void |
| 177 | fill_fpregset (elf_fpregset_t *fpregsetp, int regnum) |
| 178 | { |
| 179 | x86_64_fill_fxsave ((char *) fpregsetp, regnum); |
| 180 | } |
| 181 | |
| 182 | /* Fetch all floating-point registers from process/thread TID and store |
| 183 | thier values in GDB's register cache. */ |
| 184 | |
| 185 | static void |
| 186 | fetch_fpregs (int tid) |
| 187 | { |
| 188 | elf_fpregset_t fpregs; |
| 189 | |
| 190 | if (ptrace (PTRACE_GETFPREGS, tid, 0, (long) &fpregs) < 0) |
| 191 | perror_with_name ("Couldn't get floating point status"); |
| 192 | |
| 193 | supply_fpregset (&fpregs); |
| 194 | } |
| 195 | |
| 196 | /* Store all valid floating-point registers in GDB's register cache |
| 197 | into the process/thread specified by TID. */ |
| 198 | |
| 199 | static void |
| 200 | store_fpregs (int tid, int regnum) |
| 201 | { |
| 202 | elf_fpregset_t fpregs; |
| 203 | |
| 204 | if (ptrace (PTRACE_GETFPREGS, tid, 0, (long) &fpregs) < 0) |
| 205 | perror_with_name ("Couldn't get floating point status"); |
| 206 | |
| 207 | fill_fpregset (&fpregs, regnum); |
| 208 | |
| 209 | if (ptrace (PTRACE_SETFPREGS, tid, 0, (long) &fpregs) < 0) |
| 210 | perror_with_name ("Couldn't write floating point status"); |
| 211 | } |
| 212 | \f |
| 213 | |
| 214 | /* Transferring arbitrary registers between GDB and inferior. */ |
| 215 | |
| 216 | /* Fetch register REGNUM from the child process. If REGNUM is -1, do |
| 217 | this for all registers (including the floating point and SSE |
| 218 | registers). */ |
| 219 | |
| 220 | void |
| 221 | fetch_inferior_registers (int regnum) |
| 222 | { |
| 223 | int tid; |
| 224 | |
| 225 | /* GNU/Linux LWP ID's are process ID's. */ |
| 226 | tid = TIDGET (inferior_ptid); |
| 227 | if (tid == 0) |
| 228 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ |
| 229 | |
| 230 | if (regnum == -1 || amd64_native_gregset_supplies_p (regnum)) |
| 231 | { |
| 232 | fetch_regs (tid); |
| 233 | if (regnum != -1) |
| 234 | return; |
| 235 | } |
| 236 | |
| 237 | if (regnum == -1 || GETFPREGS_SUPPLIES (regnum)) |
| 238 | { |
| 239 | fetch_fpregs (tid); |
| 240 | return; |
| 241 | } |
| 242 | |
| 243 | internal_error (__FILE__, __LINE__, |
| 244 | "Got request for bad register number %d.", regnum); |
| 245 | } |
| 246 | |
| 247 | /* Store register REGNUM back into the child process. If REGNUM is |
| 248 | -1, do this for all registers (including the floating-point and SSE |
| 249 | registers). */ |
| 250 | |
| 251 | void |
| 252 | store_inferior_registers (int regnum) |
| 253 | { |
| 254 | int tid; |
| 255 | |
| 256 | /* GNU/Linux LWP ID's are process ID's. */ |
| 257 | tid = TIDGET (inferior_ptid); |
| 258 | if (tid == 0) |
| 259 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ |
| 260 | |
| 261 | if (regnum == -1 || amd64_native_gregset_supplies_p (regnum)) |
| 262 | { |
| 263 | store_regs (tid, regnum); |
| 264 | if (regnum != -1) |
| 265 | return; |
| 266 | } |
| 267 | |
| 268 | if (regnum == -1 || GETFPREGS_SUPPLIES (regnum)) |
| 269 | { |
| 270 | store_fpregs (tid, regnum); |
| 271 | return; |
| 272 | } |
| 273 | |
| 274 | internal_error (__FILE__, __LINE__, |
| 275 | "Got request to store bad register number %d.", regnum); |
| 276 | } |
| 277 | \f |
| 278 | |
| 279 | static unsigned long |
| 280 | x86_64_linux_dr_get (int regnum) |
| 281 | { |
| 282 | int tid; |
| 283 | unsigned long value; |
| 284 | |
| 285 | /* FIXME: kettenis/2001-01-29: It's not clear what we should do with |
| 286 | multi-threaded processes here. For now, pretend there is just |
| 287 | one thread. */ |
| 288 | tid = PIDGET (inferior_ptid); |
| 289 | |
| 290 | /* FIXME: kettenis/2001-03-27: Calling perror_with_name if the |
| 291 | ptrace call fails breaks debugging remote targets. The correct |
| 292 | way to fix this is to add the hardware breakpoint and watchpoint |
| 293 | stuff to the target vectore. For now, just return zero if the |
| 294 | ptrace call fails. */ |
| 295 | errno = 0; |
| 296 | value = ptrace (PT_READ_U, tid, |
| 297 | offsetof (struct user, u_debugreg[regnum]), 0); |
| 298 | if (errno != 0) |
| 299 | #if 0 |
| 300 | perror_with_name ("Couldn't read debug register"); |
| 301 | #else |
| 302 | return 0; |
| 303 | #endif |
| 304 | |
| 305 | return value; |
| 306 | } |
| 307 | |
| 308 | static void |
| 309 | x86_64_linux_dr_set (int regnum, unsigned long value) |
| 310 | { |
| 311 | int tid; |
| 312 | |
| 313 | /* FIXME: kettenis/2001-01-29: It's not clear what we should do with |
| 314 | multi-threaded processes here. For now, pretend there is just |
| 315 | one thread. */ |
| 316 | tid = PIDGET (inferior_ptid); |
| 317 | |
| 318 | errno = 0; |
| 319 | ptrace (PT_WRITE_U, tid, offsetof (struct user, u_debugreg[regnum]), value); |
| 320 | if (errno != 0) |
| 321 | perror_with_name ("Couldn't write debug register"); |
| 322 | } |
| 323 | |
| 324 | void |
| 325 | x86_64_linux_dr_set_control (unsigned long control) |
| 326 | { |
| 327 | x86_64_linux_dr_set (DR_CONTROL, control); |
| 328 | } |
| 329 | |
| 330 | void |
| 331 | x86_64_linux_dr_set_addr (int regnum, CORE_ADDR addr) |
| 332 | { |
| 333 | gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR); |
| 334 | |
| 335 | x86_64_linux_dr_set (DR_FIRSTADDR + regnum, addr); |
| 336 | } |
| 337 | |
| 338 | void |
| 339 | x86_64_linux_dr_reset_addr (int regnum) |
| 340 | { |
| 341 | gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR); |
| 342 | |
| 343 | x86_64_linux_dr_set (DR_FIRSTADDR + regnum, 0L); |
| 344 | } |
| 345 | |
| 346 | unsigned long |
| 347 | x86_64_linux_dr_get_status (void) |
| 348 | { |
| 349 | return x86_64_linux_dr_get (DR_STATUS); |
| 350 | } |
| 351 | |
| 352 | extern ps_err_e |
| 353 | ps_get_thread_area (const struct ps_prochandle *ph, |
| 354 | lwpid_t lwpid, int idx, void **base) |
| 355 | { |
| 356 | |
| 357 | /* This definition comes from prctl.h, but some kernels may not have it. */ |
| 358 | #ifndef PTRACE_ARCH_PRCTL |
| 359 | #define PTRACE_ARCH_PRCTL 30 |
| 360 | #endif |
| 361 | |
| 362 | /* FIXME: ezannoni-2003-07-09 see comment above about include file order. |
| 363 | We could be getting bogus values for these two. */ |
| 364 | gdb_assert (FS < ELF_NGREG); |
| 365 | gdb_assert (GS < ELF_NGREG); |
| 366 | switch (idx) |
| 367 | { |
| 368 | case FS: |
| 369 | if (ptrace (PTRACE_ARCH_PRCTL, lwpid, base, ARCH_GET_FS) == 0) |
| 370 | return PS_OK; |
| 371 | break; |
| 372 | case GS: |
| 373 | if (ptrace (PTRACE_ARCH_PRCTL, lwpid, base, ARCH_GET_GS) == 0) |
| 374 | return PS_OK; |
| 375 | break; |
| 376 | default: /* Should not happen. */ |
| 377 | return PS_BADADDR; |
| 378 | } |
| 379 | return PS_ERR; /* ptrace failed. */ |
| 380 | } |
| 381 | |
| 382 | void |
| 383 | child_post_startup_inferior (ptid_t ptid) |
| 384 | { |
| 385 | i386_cleanup_dregs (); |
| 386 | linux_child_post_startup_inferior (ptid); |
| 387 | } |
| 388 | \f |
| 389 | |
| 390 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
| 391 | void _initialize_x86_64_linux_nat (void); |
| 392 | |
| 393 | void |
| 394 | _initialize_x86_64_linux_nat (void) |
| 395 | { |
| 396 | amd64_native_gregset32_reg_offset = x86_64_linux_gregset32_reg_offset; |
| 397 | amd64_native_gregset32_num_regs = I386_LINUX_NUM_REGS; |
| 398 | amd64_native_gregset64_reg_offset = x86_64_linux_gregset64_reg_offset; |
| 399 | |
| 400 | gdb_assert (ARRAY_SIZE (x86_64_linux_gregset32_reg_offset) |
| 401 | == amd64_native_gregset32_num_regs); |
| 402 | gdb_assert (ARRAY_SIZE (x86_64_linux_gregset64_reg_offset) |
| 403 | == amd64_native_gregset64_num_regs); |
| 404 | } |