Commit | Line | Data |
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a4b6fc86 | 1 | /* Native-dependent code for GNU/Linux x86-64. |
0a65a603 | 2 | |
6aba47ca | 3 | Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007 |
f973ed9c | 4 | Free Software Foundation, Inc. |
53e95fcf JS |
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 | |
a9762ec7 | 11 | the Free Software Foundation; either version 3 of the License, or |
53e95fcf JS |
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 | |
a9762ec7 | 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
53e95fcf JS |
21 | |
22 | #include "defs.h" | |
23 | #include "inferior.h" | |
24 | #include "gdbcore.h" | |
25 | #include "regcache.h" | |
4056d258 | 26 | #include "linux-nat.h" |
8695c747 | 27 | #include "amd64-linux-tdep.h" |
c4f35dd8 | 28 | |
53e95fcf | 29 | #include "gdb_assert.h" |
30d52491 | 30 | #include "gdb_string.h" |
53e95fcf JS |
31 | #include <sys/ptrace.h> |
32 | #include <sys/debugreg.h> | |
33 | #include <sys/syscall.h> | |
34 | #include <sys/procfs.h> | |
c43af07c EZ |
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> | |
33a0a2ac | 44 | #include <sys/reg.h> |
c43af07c | 45 | #include "gdb_proc_service.h" |
33a0a2ac | 46 | |
c4f35dd8 MK |
47 | /* Prototypes for supply_gregset etc. */ |
48 | #include "gregset.h" | |
49 | ||
9c1488cb | 50 | #include "amd64-tdep.h" |
60fac5b8 MK |
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 | ||
430eaf2e | 57 | static int amd64_linux_gregset64_reg_offset[] = |
60fac5b8 MK |
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 */ | |
af233647 | 68 | CS * 8, SS * 8, /* %cs, %ss */ |
60fac5b8 | 69 | DS * 8, ES * 8, /* %ds, %es */ |
8695c747 DJ |
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 | |
60fac5b8 MK |
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. */ | |
430eaf2e | 88 | static int amd64_linux_gregset32_reg_offset[] = |
60fac5b8 | 89 | { |
f5859b4d MK |
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 */ | |
60fac5b8 MK |
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, | |
f5859b4d | 101 | ORIG_RAX * 8 /* "orig_eax" */ |
60fac5b8 | 102 | }; |
53e95fcf JS |
103 | \f |
104 | ||
105 | /* Transfering the general-purpose registers between GDB, inferiors | |
106 | and core files. */ | |
107 | ||
60fac5b8 | 108 | /* Fill GDB's register cache with the general-purpose register values |
53e95fcf JS |
109 | in *GREGSETP. */ |
110 | ||
111 | void | |
7f7fe91e | 112 | supply_gregset (struct regcache *regcache, const elf_gregset_t *gregsetp) |
53e95fcf | 113 | { |
7f7fe91e | 114 | amd64_supply_native_gregset (regcache, gregsetp, -1); |
53e95fcf JS |
115 | } |
116 | ||
60fac5b8 MK |
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, | |
53e95fcf JS |
119 | do this for all registers. */ |
120 | ||
121 | void | |
7f7fe91e UW |
122 | fill_gregset (const struct regcache *regcache, |
123 | elf_gregset_t *gregsetp, int regnum) | |
53e95fcf | 124 | { |
7f7fe91e | 125 | amd64_collect_native_gregset (regcache, gregsetp, regnum); |
53e95fcf JS |
126 | } |
127 | ||
53e95fcf JS |
128 | /* Transfering floating-point registers between GDB, inferiors and cores. */ |
129 | ||
60fac5b8 | 130 | /* Fill GDB's register cache with the floating-point and SSE register |
c4f35dd8 | 131 | values in *FPREGSETP. */ |
53e95fcf JS |
132 | |
133 | void | |
7f7fe91e | 134 | supply_fpregset (struct regcache *regcache, const elf_fpregset_t *fpregsetp) |
53e95fcf | 135 | { |
7f7fe91e | 136 | amd64_supply_fxsave (regcache, -1, fpregsetp); |
53e95fcf JS |
137 | } |
138 | ||
8dda9770 | 139 | /* Fill register REGNUM (if it is a floating-point or SSE register) in |
60fac5b8 | 140 | *FPREGSETP with the value in GDB's register cache. If REGNUM is |
c4f35dd8 | 141 | -1, do this for all registers. */ |
53e95fcf JS |
142 | |
143 | void | |
7f7fe91e UW |
144 | fill_fpregset (const struct regcache *regcache, |
145 | elf_fpregset_t *fpregsetp, int regnum) | |
53e95fcf | 146 | { |
7f7fe91e | 147 | amd64_collect_fxsave (regcache, regnum, fpregsetp); |
53e95fcf | 148 | } |
53e95fcf JS |
149 | \f |
150 | ||
151 | /* Transferring arbitrary registers between GDB and inferior. */ | |
152 | ||
60fac5b8 | 153 | /* Fetch register REGNUM from the child process. If REGNUM is -1, do |
53e95fcf JS |
154 | this for all registers (including the floating point and SSE |
155 | registers). */ | |
156 | ||
10d6c8cd | 157 | static void |
56be3814 | 158 | amd64_linux_fetch_inferior_registers (struct regcache *regcache, int regnum) |
53e95fcf JS |
159 | { |
160 | int tid; | |
161 | ||
a4b6fc86 | 162 | /* GNU/Linux LWP ID's are process ID's. */ |
c4f35dd8 MK |
163 | tid = TIDGET (inferior_ptid); |
164 | if (tid == 0) | |
165 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ | |
53e95fcf | 166 | |
60fac5b8 | 167 | if (regnum == -1 || amd64_native_gregset_supplies_p (regnum)) |
53e95fcf | 168 | { |
99679982 MK |
169 | elf_gregset_t regs; |
170 | ||
171 | if (ptrace (PTRACE_GETREGS, tid, 0, (long) ®s) < 0) | |
edefbb7c | 172 | perror_with_name (_("Couldn't get registers")); |
99679982 | 173 | |
56be3814 | 174 | amd64_supply_native_gregset (regcache, ®s, -1); |
60fac5b8 MK |
175 | if (regnum != -1) |
176 | return; | |
53e95fcf JS |
177 | } |
178 | ||
18bbbd9e | 179 | if (regnum == -1 || !amd64_native_gregset_supplies_p (regnum)) |
53e95fcf | 180 | { |
99679982 | 181 | elf_fpregset_t fpregs; |
53e95fcf | 182 | |
99679982 | 183 | if (ptrace (PTRACE_GETFPREGS, tid, 0, (long) &fpregs) < 0) |
edefbb7c | 184 | perror_with_name (_("Couldn't get floating point status")); |
99679982 | 185 | |
56be3814 | 186 | amd64_supply_fxsave (regcache, -1, &fpregs); |
99679982 | 187 | } |
53e95fcf JS |
188 | } |
189 | ||
60fac5b8 MK |
190 | /* Store register REGNUM back into the child process. If REGNUM is |
191 | -1, do this for all registers (including the floating-point and SSE | |
53e95fcf | 192 | registers). */ |
c4f35dd8 | 193 | |
10d6c8cd | 194 | static void |
56be3814 | 195 | amd64_linux_store_inferior_registers (struct regcache *regcache, int regnum) |
53e95fcf JS |
196 | { |
197 | int tid; | |
198 | ||
a4b6fc86 | 199 | /* GNU/Linux LWP ID's are process ID's. */ |
c4f35dd8 MK |
200 | tid = TIDGET (inferior_ptid); |
201 | if (tid == 0) | |
202 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ | |
53e95fcf | 203 | |
60fac5b8 | 204 | if (regnum == -1 || amd64_native_gregset_supplies_p (regnum)) |
53e95fcf | 205 | { |
99679982 MK |
206 | elf_gregset_t regs; |
207 | ||
208 | if (ptrace (PTRACE_GETREGS, tid, 0, (long) ®s) < 0) | |
edefbb7c | 209 | perror_with_name (_("Couldn't get registers")); |
99679982 | 210 | |
56be3814 | 211 | amd64_collect_native_gregset (regcache, ®s, regnum); |
99679982 MK |
212 | |
213 | if (ptrace (PTRACE_SETREGS, tid, 0, (long) ®s) < 0) | |
edefbb7c | 214 | perror_with_name (_("Couldn't write registers")); |
99679982 | 215 | |
60fac5b8 MK |
216 | if (regnum != -1) |
217 | return; | |
53e95fcf JS |
218 | } |
219 | ||
18bbbd9e | 220 | if (regnum == -1 || !amd64_native_gregset_supplies_p (regnum)) |
53e95fcf | 221 | { |
99679982 MK |
222 | elf_fpregset_t fpregs; |
223 | ||
224 | if (ptrace (PTRACE_GETFPREGS, tid, 0, (long) &fpregs) < 0) | |
edefbb7c | 225 | perror_with_name (_("Couldn't get floating point status")); |
99679982 | 226 | |
56be3814 | 227 | amd64_collect_fxsave (regcache, regnum, &fpregs); |
99679982 MK |
228 | |
229 | if (ptrace (PTRACE_SETFPREGS, tid, 0, (long) &fpregs) < 0) | |
edefbb7c | 230 | perror_with_name (_("Couldn't write floating point status")); |
99679982 | 231 | |
53e95fcf JS |
232 | return; |
233 | } | |
53e95fcf JS |
234 | } |
235 | \f | |
236 | ||
c4f35dd8 | 237 | static unsigned long |
430eaf2e | 238 | amd64_linux_dr_get (int regnum) |
c4f35dd8 MK |
239 | { |
240 | int tid; | |
241 | unsigned long value; | |
53e95fcf | 242 | |
c4f35dd8 MK |
243 | /* FIXME: kettenis/2001-01-29: It's not clear what we should do with |
244 | multi-threaded processes here. For now, pretend there is just | |
245 | one thread. */ | |
246 | tid = PIDGET (inferior_ptid); | |
53e95fcf | 247 | |
c4f35dd8 MK |
248 | /* FIXME: kettenis/2001-03-27: Calling perror_with_name if the |
249 | ptrace call fails breaks debugging remote targets. The correct | |
250 | way to fix this is to add the hardware breakpoint and watchpoint | |
251 | stuff to the target vectore. For now, just return zero if the | |
252 | ptrace call fails. */ | |
253 | errno = 0; | |
254 | value = ptrace (PT_READ_U, tid, | |
255 | offsetof (struct user, u_debugreg[regnum]), 0); | |
256 | if (errno != 0) | |
257 | #if 0 | |
edefbb7c | 258 | perror_with_name (_("Couldn't read debug register")); |
c4f35dd8 MK |
259 | #else |
260 | return 0; | |
53e95fcf JS |
261 | #endif |
262 | ||
c4f35dd8 MK |
263 | return value; |
264 | } | |
53e95fcf JS |
265 | |
266 | static void | |
430eaf2e | 267 | amd64_linux_dr_set (int regnum, unsigned long value) |
53e95fcf | 268 | { |
c4f35dd8 | 269 | int tid; |
53e95fcf | 270 | |
c4f35dd8 MK |
271 | /* FIXME: kettenis/2001-01-29: It's not clear what we should do with |
272 | multi-threaded processes here. For now, pretend there is just | |
273 | one thread. */ | |
274 | tid = PIDGET (inferior_ptid); | |
53e95fcf | 275 | |
c4f35dd8 MK |
276 | errno = 0; |
277 | ptrace (PT_WRITE_U, tid, offsetof (struct user, u_debugreg[regnum]), value); | |
278 | if (errno != 0) | |
edefbb7c | 279 | perror_with_name (_("Couldn't write debug register")); |
c4f35dd8 | 280 | } |
53e95fcf | 281 | |
c4f35dd8 | 282 | void |
430eaf2e | 283 | amd64_linux_dr_set_control (unsigned long control) |
c4f35dd8 | 284 | { |
430eaf2e | 285 | amd64_linux_dr_set (DR_CONTROL, control); |
c4f35dd8 | 286 | } |
53e95fcf | 287 | |
c4f35dd8 | 288 | void |
430eaf2e | 289 | amd64_linux_dr_set_addr (int regnum, CORE_ADDR addr) |
b7c4cbf8 | 290 | { |
c4f35dd8 MK |
291 | gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR); |
292 | ||
430eaf2e | 293 | amd64_linux_dr_set (DR_FIRSTADDR + regnum, addr); |
b7c4cbf8 AJ |
294 | } |
295 | ||
53e95fcf | 296 | void |
430eaf2e | 297 | amd64_linux_dr_reset_addr (int regnum) |
53e95fcf | 298 | { |
c4f35dd8 MK |
299 | gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR); |
300 | ||
430eaf2e | 301 | amd64_linux_dr_set (DR_FIRSTADDR + regnum, 0L); |
53e95fcf | 302 | } |
8cfda98c | 303 | |
c4f35dd8 | 304 | unsigned long |
430eaf2e | 305 | amd64_linux_dr_get_status (void) |
8cfda98c | 306 | { |
430eaf2e | 307 | return amd64_linux_dr_get (DR_STATUS); |
8cfda98c | 308 | } |
5bca7895 | 309 | \f |
c43af07c | 310 | |
50d71875 AC |
311 | /* This function is called by libthread_db as part of its handling of |
312 | a request for a thread's local storage address. */ | |
313 | ||
5bca7895 | 314 | ps_err_e |
c43af07c EZ |
315 | ps_get_thread_area (const struct ps_prochandle *ph, |
316 | lwpid_t lwpid, int idx, void **base) | |
317 | { | |
50d71875 AC |
318 | if (gdbarch_ptr_bit (current_gdbarch) == 32) |
319 | { | |
320 | /* The full structure is found in <asm-i386/ldt.h>. The second | |
321 | integer is the LDT's base_address and that is used to locate | |
322 | the thread's local storage. See i386-linux-nat.c more | |
323 | info. */ | |
324 | unsigned int desc[4]; | |
325 | ||
326 | /* This code assumes that "int" is 32 bits and that | |
327 | GET_THREAD_AREA returns no more than 4 int values. */ | |
328 | gdb_assert (sizeof (int) == 4); | |
329 | #ifndef PTRACE_GET_THREAD_AREA | |
330 | #define PTRACE_GET_THREAD_AREA 25 | |
331 | #endif | |
332 | if (ptrace (PTRACE_GET_THREAD_AREA, | |
333 | lwpid, (void *) (long) idx, (unsigned long) &desc) < 0) | |
334 | return PS_ERR; | |
335 | ||
336 | /* Extend the value to 64 bits. Here it's assumed that a "long" | |
337 | and a "void *" are the same. */ | |
338 | (*base) = (void *) (long) desc[1]; | |
339 | return PS_OK; | |
340 | } | |
341 | else | |
342 | { | |
343 | /* This definition comes from prctl.h, but some kernels may not | |
344 | have it. */ | |
c43af07c EZ |
345 | #ifndef PTRACE_ARCH_PRCTL |
346 | #define PTRACE_ARCH_PRCTL 30 | |
347 | #endif | |
50d71875 AC |
348 | /* FIXME: ezannoni-2003-07-09 see comment above about include |
349 | file order. We could be getting bogus values for these two. */ | |
350 | gdb_assert (FS < ELF_NGREG); | |
351 | gdb_assert (GS < ELF_NGREG); | |
352 | switch (idx) | |
353 | { | |
354 | case FS: | |
355 | if (ptrace (PTRACE_ARCH_PRCTL, lwpid, base, ARCH_GET_FS) == 0) | |
356 | return PS_OK; | |
357 | break; | |
358 | case GS: | |
359 | if (ptrace (PTRACE_ARCH_PRCTL, lwpid, base, ARCH_GET_GS) == 0) | |
360 | return PS_OK; | |
361 | break; | |
362 | default: /* Should not happen. */ | |
363 | return PS_BADADDR; | |
364 | } | |
c43af07c | 365 | } |
b6d42148 | 366 | return PS_ERR; /* ptrace failed. */ |
c43af07c | 367 | } |
5bca7895 | 368 | \f |
c43af07c | 369 | |
10d6c8cd DJ |
370 | static void (*super_post_startup_inferior) (ptid_t ptid); |
371 | ||
372 | static void | |
373 | amd64_linux_child_post_startup_inferior (ptid_t ptid) | |
4056d258 ML |
374 | { |
375 | i386_cleanup_dregs (); | |
10d6c8cd | 376 | super_post_startup_inferior (ptid); |
4056d258 | 377 | } |
60fac5b8 MK |
378 | \f |
379 | ||
380 | /* Provide a prototype to silence -Wmissing-prototypes. */ | |
430eaf2e | 381 | void _initialize_amd64_linux_nat (void); |
60fac5b8 MK |
382 | |
383 | void | |
430eaf2e | 384 | _initialize_amd64_linux_nat (void) |
60fac5b8 | 385 | { |
10d6c8cd DJ |
386 | struct target_ops *t; |
387 | ||
430eaf2e | 388 | amd64_native_gregset32_reg_offset = amd64_linux_gregset32_reg_offset; |
60fac5b8 | 389 | amd64_native_gregset32_num_regs = I386_LINUX_NUM_REGS; |
430eaf2e | 390 | amd64_native_gregset64_reg_offset = amd64_linux_gregset64_reg_offset; |
8695c747 | 391 | amd64_native_gregset64_num_regs = AMD64_LINUX_NUM_REGS; |
60fac5b8 | 392 | |
430eaf2e | 393 | gdb_assert (ARRAY_SIZE (amd64_linux_gregset32_reg_offset) |
60fac5b8 | 394 | == amd64_native_gregset32_num_regs); |
430eaf2e | 395 | gdb_assert (ARRAY_SIZE (amd64_linux_gregset64_reg_offset) |
60fac5b8 | 396 | == amd64_native_gregset64_num_regs); |
10d6c8cd DJ |
397 | |
398 | /* Fill in the generic GNU/Linux methods. */ | |
399 | t = linux_target (); | |
400 | ||
401 | /* Override the GNU/Linux inferior startup hook. */ | |
402 | super_post_startup_inferior = t->to_post_startup_inferior; | |
403 | t->to_post_startup_inferior = amd64_linux_child_post_startup_inferior; | |
404 | ||
405 | /* Add our register access methods. */ | |
406 | t->to_fetch_registers = amd64_linux_fetch_inferior_registers; | |
407 | t->to_store_registers = amd64_linux_store_inferior_registers; | |
408 | ||
409 | /* Register the target. */ | |
f973ed9c | 410 | linux_nat_add_target (t); |
60fac5b8 | 411 | } |