Commit | Line | Data |
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a4b6fc86 | 1 | /* Native-dependent code for GNU/Linux x86-64. |
0a65a603 | 2 | |
af233647 | 3 | Copyright 2001, 2002, 2003, 2004 Free Software Foundation, Inc. |
53e95fcf JS |
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" | |
4056d258 | 27 | #include "linux-nat.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 MK |
50 | #include "amd64-tdep.h" |
51 | #include "amd64-linux-tdep.h" | |
60fac5b8 MK |
52 | #include "i386-linux-tdep.h" |
53 | #include "amd64-nat.h" | |
54 | ||
55 | /* Mapping between the general-purpose registers in GNU/Linux x86-64 | |
56 | `struct user' format and GDB's register cache layout. */ | |
57 | ||
430eaf2e | 58 | static int amd64_linux_gregset64_reg_offset[] = |
60fac5b8 MK |
59 | { |
60 | RAX * 8, RBX * 8, /* %rax, %rbx */ | |
61 | RCX * 8, RDX * 8, /* %rcx, %rdx */ | |
62 | RSI * 8, RDI * 8, /* %rsi, %rdi */ | |
63 | RBP * 8, RSP * 8, /* %rbp, %rsp */ | |
64 | R8 * 8, R9 * 8, /* %r8 ... */ | |
65 | R10 * 8, R11 * 8, | |
66 | R12 * 8, R13 * 8, | |
67 | R14 * 8, R15 * 8, /* ... %r15 */ | |
68 | RIP * 8, EFLAGS * 8, /* %rip, %eflags */ | |
af233647 | 69 | CS * 8, SS * 8, /* %cs, %ss */ |
60fac5b8 MK |
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. */ | |
430eaf2e | 84 | static int amd64_linux_gregset32_reg_offset[] = |
60fac5b8 | 85 | { |
f5859b4d MK |
86 | RAX * 8, RCX * 8, /* %eax, %ecx */ |
87 | RDX * 8, RBX * 8, /* %edx, %ebx */ | |
88 | RSP * 8, RBP * 8, /* %esp, %ebp */ | |
89 | RSI * 8, RDI * 8, /* %esi, %edi */ | |
90 | RIP * 8, EFLAGS * 8, /* %eip, %eflags */ | |
91 | CS * 8, SS * 8, /* %cs, %ss */ | |
92 | DS * 8, ES * 8, /* %ds, %es */ | |
93 | FS * 8, GS * 8, /* %fs, %gs */ | |
60fac5b8 MK |
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, | |
f5859b4d | 97 | ORIG_RAX * 8 /* "orig_eax" */ |
60fac5b8 | 98 | }; |
53e95fcf | 99 | |
c4f35dd8 MK |
100 | /* Which ptrace request retrieves which registers? |
101 | These apply to the corresponding SET requests as well. */ | |
53e95fcf | 102 | |
53e95fcf JS |
103 | #define GETFPREGS_SUPPLIES(regno) \ |
104 | (FP0_REGNUM <= (regno) && (regno) <= MXCSR_REGNUM) | |
53e95fcf JS |
105 | \f |
106 | ||
107 | /* Transfering the general-purpose registers between GDB, inferiors | |
108 | and core files. */ | |
109 | ||
60fac5b8 | 110 | /* Fill GDB's register cache with the general-purpose register values |
53e95fcf JS |
111 | in *GREGSETP. */ |
112 | ||
113 | void | |
c4f35dd8 | 114 | supply_gregset (elf_gregset_t *gregsetp) |
53e95fcf | 115 | { |
60fac5b8 | 116 | amd64_supply_native_gregset (current_regcache, gregsetp, -1); |
53e95fcf JS |
117 | } |
118 | ||
60fac5b8 MK |
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, | |
53e95fcf JS |
121 | do this for all registers. */ |
122 | ||
123 | void | |
60fac5b8 | 124 | fill_gregset (elf_gregset_t *gregsetp, int regnum) |
53e95fcf | 125 | { |
60fac5b8 | 126 | amd64_collect_native_gregset (current_regcache, gregsetp, regnum); |
53e95fcf JS |
127 | } |
128 | ||
129 | /* Fetch all general-purpose registers from process/thread TID and | |
60fac5b8 | 130 | store their values in GDB's register cache. */ |
53e95fcf JS |
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) | |
7b3fabf0 | 138 | perror_with_name ("Couldn't get registers"); |
53e95fcf JS |
139 | |
140 | supply_gregset (®s); | |
141 | } | |
142 | ||
60fac5b8 | 143 | /* Store all valid general-purpose registers in GDB's register cache |
53e95fcf JS |
144 | into the process/thread specified by TID. */ |
145 | ||
146 | static void | |
60fac5b8 | 147 | store_regs (int tid, int regnum) |
53e95fcf JS |
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 | ||
60fac5b8 | 154 | fill_gregset (®s, regnum); |
53e95fcf JS |
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 | ||
60fac5b8 | 163 | /* Fill GDB's register cache with the floating-point and SSE register |
c4f35dd8 | 164 | values in *FPREGSETP. */ |
53e95fcf JS |
165 | |
166 | void | |
c4f35dd8 | 167 | supply_fpregset (elf_fpregset_t *fpregsetp) |
53e95fcf | 168 | { |
90f90721 | 169 | amd64_supply_fxsave (current_regcache, -1, fpregsetp); |
53e95fcf JS |
170 | } |
171 | ||
8dda9770 | 172 | /* Fill register REGNUM (if it is a floating-point or SSE register) in |
60fac5b8 | 173 | *FPREGSETP with the value in GDB's register cache. If REGNUM is |
c4f35dd8 | 174 | -1, do this for all registers. */ |
53e95fcf JS |
175 | |
176 | void | |
c4f35dd8 | 177 | fill_fpregset (elf_fpregset_t *fpregsetp, int regnum) |
53e95fcf | 178 | { |
90f90721 | 179 | amd64_fill_fxsave ((char *) fpregsetp, regnum); |
53e95fcf JS |
180 | } |
181 | ||
182 | /* Fetch all floating-point registers from process/thread TID and store | |
60fac5b8 | 183 | thier values in GDB's register cache. */ |
53e95fcf JS |
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 | ||
60fac5b8 | 196 | /* Store all valid floating-point registers in GDB's register cache |
53e95fcf JS |
197 | into the process/thread specified by TID. */ |
198 | ||
199 | static void | |
60fac5b8 | 200 | store_fpregs (int tid, int regnum) |
53e95fcf JS |
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 | ||
60fac5b8 | 207 | fill_fpregset (&fpregs, regnum); |
53e95fcf JS |
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 | ||
60fac5b8 | 216 | /* Fetch register REGNUM from the child process. If REGNUM is -1, do |
53e95fcf JS |
217 | this for all registers (including the floating point and SSE |
218 | registers). */ | |
219 | ||
220 | void | |
60fac5b8 | 221 | fetch_inferior_registers (int regnum) |
53e95fcf JS |
222 | { |
223 | int tid; | |
224 | ||
a4b6fc86 | 225 | /* GNU/Linux LWP ID's are process ID's. */ |
c4f35dd8 MK |
226 | tid = TIDGET (inferior_ptid); |
227 | if (tid == 0) | |
228 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ | |
53e95fcf | 229 | |
60fac5b8 | 230 | if (regnum == -1 || amd64_native_gregset_supplies_p (regnum)) |
53e95fcf JS |
231 | { |
232 | fetch_regs (tid); | |
60fac5b8 MK |
233 | if (regnum != -1) |
234 | return; | |
53e95fcf JS |
235 | } |
236 | ||
60fac5b8 | 237 | if (regnum == -1 || GETFPREGS_SUPPLIES (regnum)) |
53e95fcf JS |
238 | { |
239 | fetch_fpregs (tid); | |
240 | return; | |
241 | } | |
242 | ||
243 | internal_error (__FILE__, __LINE__, | |
60fac5b8 | 244 | "Got request for bad register number %d.", regnum); |
53e95fcf JS |
245 | } |
246 | ||
60fac5b8 MK |
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 | |
53e95fcf | 249 | registers). */ |
c4f35dd8 | 250 | |
53e95fcf | 251 | void |
60fac5b8 | 252 | store_inferior_registers (int regnum) |
53e95fcf JS |
253 | { |
254 | int tid; | |
255 | ||
a4b6fc86 | 256 | /* GNU/Linux LWP ID's are process ID's. */ |
c4f35dd8 MK |
257 | tid = TIDGET (inferior_ptid); |
258 | if (tid == 0) | |
259 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ | |
53e95fcf | 260 | |
60fac5b8 | 261 | if (regnum == -1 || amd64_native_gregset_supplies_p (regnum)) |
53e95fcf | 262 | { |
60fac5b8 MK |
263 | store_regs (tid, regnum); |
264 | if (regnum != -1) | |
265 | return; | |
53e95fcf JS |
266 | } |
267 | ||
60fac5b8 | 268 | if (regnum == -1 || GETFPREGS_SUPPLIES (regnum)) |
53e95fcf | 269 | { |
60fac5b8 | 270 | store_fpregs (tid, regnum); |
53e95fcf JS |
271 | return; |
272 | } | |
273 | ||
274 | internal_error (__FILE__, __LINE__, | |
60fac5b8 | 275 | "Got request to store bad register number %d.", regnum); |
53e95fcf JS |
276 | } |
277 | \f | |
278 | ||
c4f35dd8 | 279 | static unsigned long |
430eaf2e | 280 | amd64_linux_dr_get (int regnum) |
c4f35dd8 MK |
281 | { |
282 | int tid; | |
283 | unsigned long value; | |
53e95fcf | 284 | |
c4f35dd8 MK |
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); | |
53e95fcf | 289 | |
c4f35dd8 MK |
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; | |
53e95fcf JS |
303 | #endif |
304 | ||
c4f35dd8 MK |
305 | return value; |
306 | } | |
53e95fcf JS |
307 | |
308 | static void | |
430eaf2e | 309 | amd64_linux_dr_set (int regnum, unsigned long value) |
53e95fcf | 310 | { |
c4f35dd8 | 311 | int tid; |
53e95fcf | 312 | |
c4f35dd8 MK |
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); | |
53e95fcf | 317 | |
c4f35dd8 MK |
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 | } | |
53e95fcf | 323 | |
c4f35dd8 | 324 | void |
430eaf2e | 325 | amd64_linux_dr_set_control (unsigned long control) |
c4f35dd8 | 326 | { |
430eaf2e | 327 | amd64_linux_dr_set (DR_CONTROL, control); |
c4f35dd8 | 328 | } |
53e95fcf | 329 | |
c4f35dd8 | 330 | void |
430eaf2e | 331 | amd64_linux_dr_set_addr (int regnum, CORE_ADDR addr) |
b7c4cbf8 | 332 | { |
c4f35dd8 MK |
333 | gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR); |
334 | ||
430eaf2e | 335 | amd64_linux_dr_set (DR_FIRSTADDR + regnum, addr); |
b7c4cbf8 AJ |
336 | } |
337 | ||
53e95fcf | 338 | void |
430eaf2e | 339 | amd64_linux_dr_reset_addr (int regnum) |
53e95fcf | 340 | { |
c4f35dd8 MK |
341 | gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR); |
342 | ||
430eaf2e | 343 | amd64_linux_dr_set (DR_FIRSTADDR + regnum, 0L); |
53e95fcf | 344 | } |
8cfda98c | 345 | |
c4f35dd8 | 346 | unsigned long |
430eaf2e | 347 | amd64_linux_dr_get_status (void) |
8cfda98c | 348 | { |
430eaf2e | 349 | return amd64_linux_dr_get (DR_STATUS); |
8cfda98c | 350 | } |
5bca7895 | 351 | \f |
c43af07c | 352 | |
394023e2 AC |
353 | /* This function is called by libthread_db as part of its handling of |
354 | a request for a thread's local storage address. */ | |
355 | ||
5bca7895 | 356 | ps_err_e |
c43af07c EZ |
357 | ps_get_thread_area (const struct ps_prochandle *ph, |
358 | lwpid_t lwpid, int idx, void **base) | |
359 | { | |
394023e2 AC |
360 | switch (gdbarch_ptr_bit (current_gdbarch) == 32) |
361 | { | |
362 | case bfd_mach_i386_i386: | |
363 | case bfd_mach_i386_i386_intel_syntax: | |
364 | { | |
365 | /* The full structure is found in <asm-i386/ldt.h>. The | |
366 | second integer is the LDT's base_address and that is used | |
367 | to locate the thread's local storage. See i386-linux-nat.c | |
368 | more info. */ | |
369 | unsigned int desc[4]; | |
370 | ||
371 | /* This code assumes that "int" is 32 bits and that | |
372 | GET_THREAD_AREA returns no more than 4 int values. */ | |
373 | gdb_assert (sizeof (int) == 4); | |
374 | #ifndef PTRACE_GET_THREAD_AREA | |
375 | #define PTRACE_GET_THREAD_AREA 25 | |
376 | #endif | |
377 | if (ptrace (PTRACE_GET_THREAD_AREA, | |
378 | lwpid, (void *) (long) idx, (unsigned long) &desc) < 0) | |
379 | return PS_ERR; | |
380 | ||
381 | /* Extend the value to 64 bits. Here it's assumed that a | |
382 | "long" and a "void *" are the same. */ | |
383 | (*base) = (void *) (long) desc[1]; | |
384 | return PS_OK; | |
385 | } | |
386 | ||
387 | case bfd_mach_x86_64: | |
388 | case bfd_mach_x86_64_intel_syntax: | |
389 | /* This definition comes from prctl.h, but some kernels may not | |
390 | have it. */ | |
c43af07c EZ |
391 | #ifndef PTRACE_ARCH_PRCTL |
392 | #define PTRACE_ARCH_PRCTL 30 | |
393 | #endif | |
394023e2 AC |
394 | /* FIXME: ezannoni-2003-07-09 see comment above about include |
395 | file order. We could be getting bogus values for these two. */ | |
396 | gdb_assert (FS < ELF_NGREG); | |
397 | gdb_assert (GS < ELF_NGREG); | |
398 | switch (idx) | |
399 | { | |
400 | case FS: | |
401 | if (ptrace (PTRACE_ARCH_PRCTL, lwpid, base, ARCH_GET_FS) == 0) | |
402 | return PS_OK; | |
403 | break; | |
404 | case GS: | |
405 | if (ptrace (PTRACE_ARCH_PRCTL, lwpid, base, ARCH_GET_GS) == 0) | |
406 | return PS_OK; | |
407 | break; | |
408 | default: /* Should not happen. */ | |
409 | return PS_BADADDR; | |
410 | } | |
411 | return PS_ERR; /* ptrace failed. */ | |
412 | ||
413 | case bfd_mach_i386_i8086: | |
414 | internal_error (__FILE__, __LINE__, "bad i8086 machine"); | |
415 | default: | |
416 | internal_error (__FILE__, __LINE__, "bad_switch"); | |
c43af07c | 417 | } |
c43af07c | 418 | } |
5bca7895 | 419 | \f |
c43af07c | 420 | |
4056d258 ML |
421 | void |
422 | child_post_startup_inferior (ptid_t ptid) | |
423 | { | |
424 | i386_cleanup_dregs (); | |
425 | linux_child_post_startup_inferior (ptid); | |
426 | } | |
60fac5b8 MK |
427 | \f |
428 | ||
429 | /* Provide a prototype to silence -Wmissing-prototypes. */ | |
430eaf2e | 430 | void _initialize_amd64_linux_nat (void); |
60fac5b8 MK |
431 | |
432 | void | |
430eaf2e | 433 | _initialize_amd64_linux_nat (void) |
60fac5b8 | 434 | { |
430eaf2e | 435 | amd64_native_gregset32_reg_offset = amd64_linux_gregset32_reg_offset; |
60fac5b8 | 436 | amd64_native_gregset32_num_regs = I386_LINUX_NUM_REGS; |
430eaf2e | 437 | amd64_native_gregset64_reg_offset = amd64_linux_gregset64_reg_offset; |
60fac5b8 | 438 | |
430eaf2e | 439 | gdb_assert (ARRAY_SIZE (amd64_linux_gregset32_reg_offset) |
60fac5b8 | 440 | == amd64_native_gregset32_num_regs); |
430eaf2e | 441 | gdb_assert (ARRAY_SIZE (amd64_linux_gregset64_reg_offset) |
60fac5b8 MK |
442 | == amd64_native_gregset64_num_regs); |
443 | } |