| 1 | /* Native-dependent code for GNU/Linux x86-64. |
| 2 | |
| 3 | Copyright 2001, 2002, 2003, 2004 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 2 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, write to the Free Software |
| 20 | Foundation, Inc., 59 Temple Place - Suite 330, |
| 21 | Boston, MA 02111-1307, USA. */ |
| 22 | |
| 23 | #include "defs.h" |
| 24 | #include "inferior.h" |
| 25 | #include "gdbcore.h" |
| 26 | #include "regcache.h" |
| 27 | #include "linux-nat.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 | }; |
| 72 | \f |
| 73 | |
| 74 | /* Mapping between the general-purpose registers in GNU/Linux x86-64 |
| 75 | `struct user' format and GDB's register cache layout for GNU/Linux |
| 76 | i386. |
| 77 | |
| 78 | Note that most GNU/Linux x86-64 registers are 64-bit, while the |
| 79 | GNU/Linux i386 registers are all 32-bit, but since we're |
| 80 | little-endian we get away with that. */ |
| 81 | |
| 82 | /* From <sys/reg.h> on GNU/Linux i386. */ |
| 83 | static int amd64_linux_gregset32_reg_offset[] = |
| 84 | { |
| 85 | RAX * 8, RCX * 8, /* %eax, %ecx */ |
| 86 | RDX * 8, RBX * 8, /* %edx, %ebx */ |
| 87 | RSP * 8, RBP * 8, /* %esp, %ebp */ |
| 88 | RSI * 8, RDI * 8, /* %esi, %edi */ |
| 89 | RIP * 8, EFLAGS * 8, /* %eip, %eflags */ |
| 90 | CS * 8, SS * 8, /* %cs, %ss */ |
| 91 | DS * 8, ES * 8, /* %ds, %es */ |
| 92 | FS * 8, GS * 8, /* %fs, %gs */ |
| 93 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 94 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 95 | -1, -1, -1, -1, -1, -1, -1, -1, -1, |
| 96 | ORIG_RAX * 8 /* "orig_eax" */ |
| 97 | }; |
| 98 | \f |
| 99 | |
| 100 | /* Transfering the general-purpose registers between GDB, inferiors |
| 101 | and core files. */ |
| 102 | |
| 103 | /* Fill GDB's register cache with the general-purpose register values |
| 104 | in *GREGSETP. */ |
| 105 | |
| 106 | void |
| 107 | supply_gregset (elf_gregset_t *gregsetp) |
| 108 | { |
| 109 | amd64_supply_native_gregset (current_regcache, gregsetp, -1); |
| 110 | } |
| 111 | |
| 112 | /* Fill register REGNUM (if it is a general-purpose register) in |
| 113 | *GREGSETP with the value in GDB's register cache. If REGNUM is -1, |
| 114 | do this for all registers. */ |
| 115 | |
| 116 | void |
| 117 | fill_gregset (elf_gregset_t *gregsetp, int regnum) |
| 118 | { |
| 119 | amd64_collect_native_gregset (current_regcache, gregsetp, regnum); |
| 120 | } |
| 121 | |
| 122 | /* Transfering floating-point registers between GDB, inferiors and cores. */ |
| 123 | |
| 124 | /* Fill GDB's register cache with the floating-point and SSE register |
| 125 | values in *FPREGSETP. */ |
| 126 | |
| 127 | void |
| 128 | supply_fpregset (elf_fpregset_t *fpregsetp) |
| 129 | { |
| 130 | amd64_supply_fxsave (current_regcache, -1, fpregsetp); |
| 131 | } |
| 132 | |
| 133 | /* Fill register REGNUM (if it is a floating-point or SSE register) in |
| 134 | *FPREGSETP with the value in GDB's register cache. If REGNUM is |
| 135 | -1, do this for all registers. */ |
| 136 | |
| 137 | void |
| 138 | fill_fpregset (elf_fpregset_t *fpregsetp, int regnum) |
| 139 | { |
| 140 | amd64_collect_fxsave (current_regcache, regnum, fpregsetp); |
| 141 | } |
| 142 | \f |
| 143 | |
| 144 | /* Transferring arbitrary registers between GDB and inferior. */ |
| 145 | |
| 146 | /* Fetch register REGNUM from the child process. If REGNUM is -1, do |
| 147 | this for all registers (including the floating point and SSE |
| 148 | registers). */ |
| 149 | |
| 150 | void |
| 151 | fetch_inferior_registers (int regnum) |
| 152 | { |
| 153 | int tid; |
| 154 | |
| 155 | /* GNU/Linux LWP ID's are process ID's. */ |
| 156 | tid = TIDGET (inferior_ptid); |
| 157 | if (tid == 0) |
| 158 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ |
| 159 | |
| 160 | if (regnum == -1 || amd64_native_gregset_supplies_p (regnum)) |
| 161 | { |
| 162 | elf_gregset_t regs; |
| 163 | |
| 164 | if (ptrace (PTRACE_GETREGS, tid, 0, (long) ®s) < 0) |
| 165 | perror_with_name ("Couldn't get registers"); |
| 166 | |
| 167 | amd64_supply_native_gregset (current_regcache, ®s, -1); |
| 168 | if (regnum != -1) |
| 169 | return; |
| 170 | } |
| 171 | |
| 172 | if (regnum == -1 || !amd64_native_gregset_supplies_p (regnum)) |
| 173 | { |
| 174 | elf_fpregset_t fpregs; |
| 175 | |
| 176 | if (ptrace (PTRACE_GETFPREGS, tid, 0, (long) &fpregs) < 0) |
| 177 | perror_with_name ("Couldn't get floating point status"); |
| 178 | |
| 179 | amd64_supply_fxsave (current_regcache, -1, &fpregs); |
| 180 | } |
| 181 | } |
| 182 | |
| 183 | /* Store register REGNUM back into the child process. If REGNUM is |
| 184 | -1, do this for all registers (including the floating-point and SSE |
| 185 | registers). */ |
| 186 | |
| 187 | void |
| 188 | store_inferior_registers (int regnum) |
| 189 | { |
| 190 | int tid; |
| 191 | |
| 192 | /* GNU/Linux LWP ID's are process ID's. */ |
| 193 | tid = TIDGET (inferior_ptid); |
| 194 | if (tid == 0) |
| 195 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ |
| 196 | |
| 197 | if (regnum == -1 || amd64_native_gregset_supplies_p (regnum)) |
| 198 | { |
| 199 | elf_gregset_t regs; |
| 200 | |
| 201 | if (ptrace (PTRACE_GETREGS, tid, 0, (long) ®s) < 0) |
| 202 | perror_with_name ("Couldn't get registers"); |
| 203 | |
| 204 | amd64_collect_native_gregset (current_regcache, ®s, regnum); |
| 205 | |
| 206 | if (ptrace (PTRACE_SETREGS, tid, 0, (long) ®s) < 0) |
| 207 | perror_with_name ("Couldn't write registers"); |
| 208 | |
| 209 | if (regnum != -1) |
| 210 | return; |
| 211 | } |
| 212 | |
| 213 | if (regnum == -1 || !amd64_native_gregset_supplies_p (regnum)) |
| 214 | { |
| 215 | elf_fpregset_t fpregs; |
| 216 | |
| 217 | if (ptrace (PTRACE_GETFPREGS, tid, 0, (long) &fpregs) < 0) |
| 218 | perror_with_name ("Couldn't get floating point status"); |
| 219 | |
| 220 | amd64_collect_fxsave (current_regcache, regnum, &fpregs); |
| 221 | |
| 222 | if (ptrace (PTRACE_SETFPREGS, tid, 0, (long) &fpregs) < 0) |
| 223 | perror_with_name ("Couldn't write floating point status"); |
| 224 | |
| 225 | return; |
| 226 | } |
| 227 | } |
| 228 | \f |
| 229 | |
| 230 | static unsigned long |
| 231 | amd64_linux_dr_get (int regnum) |
| 232 | { |
| 233 | int tid; |
| 234 | unsigned long value; |
| 235 | |
| 236 | /* FIXME: kettenis/2001-01-29: It's not clear what we should do with |
| 237 | multi-threaded processes here. For now, pretend there is just |
| 238 | one thread. */ |
| 239 | tid = PIDGET (inferior_ptid); |
| 240 | |
| 241 | /* FIXME: kettenis/2001-03-27: Calling perror_with_name if the |
| 242 | ptrace call fails breaks debugging remote targets. The correct |
| 243 | way to fix this is to add the hardware breakpoint and watchpoint |
| 244 | stuff to the target vectore. For now, just return zero if the |
| 245 | ptrace call fails. */ |
| 246 | errno = 0; |
| 247 | value = ptrace (PT_READ_U, tid, |
| 248 | offsetof (struct user, u_debugreg[regnum]), 0); |
| 249 | if (errno != 0) |
| 250 | #if 0 |
| 251 | perror_with_name ("Couldn't read debug register"); |
| 252 | #else |
| 253 | return 0; |
| 254 | #endif |
| 255 | |
| 256 | return value; |
| 257 | } |
| 258 | |
| 259 | static void |
| 260 | amd64_linux_dr_set (int regnum, unsigned long value) |
| 261 | { |
| 262 | int tid; |
| 263 | |
| 264 | /* FIXME: kettenis/2001-01-29: It's not clear what we should do with |
| 265 | multi-threaded processes here. For now, pretend there is just |
| 266 | one thread. */ |
| 267 | tid = PIDGET (inferior_ptid); |
| 268 | |
| 269 | errno = 0; |
| 270 | ptrace (PT_WRITE_U, tid, offsetof (struct user, u_debugreg[regnum]), value); |
| 271 | if (errno != 0) |
| 272 | perror_with_name ("Couldn't write debug register"); |
| 273 | } |
| 274 | |
| 275 | void |
| 276 | amd64_linux_dr_set_control (unsigned long control) |
| 277 | { |
| 278 | amd64_linux_dr_set (DR_CONTROL, control); |
| 279 | } |
| 280 | |
| 281 | void |
| 282 | amd64_linux_dr_set_addr (int regnum, CORE_ADDR addr) |
| 283 | { |
| 284 | gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR); |
| 285 | |
| 286 | amd64_linux_dr_set (DR_FIRSTADDR + regnum, addr); |
| 287 | } |
| 288 | |
| 289 | void |
| 290 | amd64_linux_dr_reset_addr (int regnum) |
| 291 | { |
| 292 | gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR); |
| 293 | |
| 294 | amd64_linux_dr_set (DR_FIRSTADDR + regnum, 0L); |
| 295 | } |
| 296 | |
| 297 | unsigned long |
| 298 | amd64_linux_dr_get_status (void) |
| 299 | { |
| 300 | return amd64_linux_dr_get (DR_STATUS); |
| 301 | } |
| 302 | \f |
| 303 | |
| 304 | /* This function is called by libthread_db as part of its handling of |
| 305 | a request for a thread's local storage address. */ |
| 306 | |
| 307 | ps_err_e |
| 308 | ps_get_thread_area (const struct ps_prochandle *ph, |
| 309 | lwpid_t lwpid, int idx, void **base) |
| 310 | { |
| 311 | if (gdbarch_ptr_bit (current_gdbarch) == 32) |
| 312 | { |
| 313 | /* The full structure is found in <asm-i386/ldt.h>. The second |
| 314 | integer is the LDT's base_address and that is used to locate |
| 315 | the thread's local storage. See i386-linux-nat.c more |
| 316 | info. */ |
| 317 | unsigned int desc[4]; |
| 318 | |
| 319 | /* This code assumes that "int" is 32 bits and that |
| 320 | GET_THREAD_AREA returns no more than 4 int values. */ |
| 321 | gdb_assert (sizeof (int) == 4); |
| 322 | #ifndef PTRACE_GET_THREAD_AREA |
| 323 | #define PTRACE_GET_THREAD_AREA 25 |
| 324 | #endif |
| 325 | if (ptrace (PTRACE_GET_THREAD_AREA, |
| 326 | lwpid, (void *) (long) idx, (unsigned long) &desc) < 0) |
| 327 | return PS_ERR; |
| 328 | |
| 329 | /* Extend the value to 64 bits. Here it's assumed that a "long" |
| 330 | and a "void *" are the same. */ |
| 331 | (*base) = (void *) (long) desc[1]; |
| 332 | return PS_OK; |
| 333 | } |
| 334 | else |
| 335 | { |
| 336 | /* This definition comes from prctl.h, but some kernels may not |
| 337 | have it. */ |
| 338 | #ifndef PTRACE_ARCH_PRCTL |
| 339 | #define PTRACE_ARCH_PRCTL 30 |
| 340 | #endif |
| 341 | /* FIXME: ezannoni-2003-07-09 see comment above about include |
| 342 | file order. We could be getting bogus values for these two. */ |
| 343 | gdb_assert (FS < ELF_NGREG); |
| 344 | gdb_assert (GS < ELF_NGREG); |
| 345 | switch (idx) |
| 346 | { |
| 347 | case FS: |
| 348 | if (ptrace (PTRACE_ARCH_PRCTL, lwpid, base, ARCH_GET_FS) == 0) |
| 349 | return PS_OK; |
| 350 | break; |
| 351 | case GS: |
| 352 | if (ptrace (PTRACE_ARCH_PRCTL, lwpid, base, ARCH_GET_GS) == 0) |
| 353 | return PS_OK; |
| 354 | break; |
| 355 | default: /* Should not happen. */ |
| 356 | return PS_BADADDR; |
| 357 | } |
| 358 | } |
| 359 | return PS_ERR; /* ptrace failed. */ |
| 360 | } |
| 361 | \f |
| 362 | |
| 363 | void |
| 364 | child_post_startup_inferior (ptid_t ptid) |
| 365 | { |
| 366 | i386_cleanup_dregs (); |
| 367 | linux_child_post_startup_inferior (ptid); |
| 368 | } |
| 369 | \f |
| 370 | |
| 371 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
| 372 | void _initialize_amd64_linux_nat (void); |
| 373 | |
| 374 | void |
| 375 | _initialize_amd64_linux_nat (void) |
| 376 | { |
| 377 | amd64_native_gregset32_reg_offset = amd64_linux_gregset32_reg_offset; |
| 378 | amd64_native_gregset32_num_regs = I386_LINUX_NUM_REGS; |
| 379 | amd64_native_gregset64_reg_offset = amd64_linux_gregset64_reg_offset; |
| 380 | |
| 381 | gdb_assert (ARRAY_SIZE (amd64_linux_gregset32_reg_offset) |
| 382 | == amd64_native_gregset32_num_regs); |
| 383 | gdb_assert (ARRAY_SIZE (amd64_linux_gregset64_reg_offset) |
| 384 | == amd64_native_gregset64_num_regs); |
| 385 | } |