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d0722149 DE |
1 | /* GNU/Linux/x86-64 specific low level interface, for the remote server |
2 | for GDB. | |
4c38e0a4 | 3 | Copyright (C) 2002, 2004, 2005, 2006, 2007, 2008, 2009, 2010 |
d0722149 DE |
4 | Free Software Foundation, Inc. |
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 3 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, see <http://www.gnu.org/licenses/>. */ | |
20 | ||
aa5ca48f | 21 | #include <stddef.h> |
d0722149 DE |
22 | #include <signal.h> |
23 | #include "server.h" | |
24 | #include "linux-low.h" | |
25 | #include "i387-fp.h" | |
aa5ca48f | 26 | #include "i386-low.h" |
d0722149 DE |
27 | |
28 | #include "gdb_proc_service.h" | |
29 | ||
90884b2b | 30 | /* Defined in auto-generated file i386-linux.c. */ |
d0722149 | 31 | void init_registers_i386_linux (void); |
90884b2b L |
32 | /* Defined in auto-generated file amd64-linux.c. */ |
33 | void init_registers_amd64_linux (void); | |
d0722149 DE |
34 | |
35 | #include <sys/reg.h> | |
36 | #include <sys/procfs.h> | |
37 | #include <sys/ptrace.h> | |
38 | ||
39 | #ifndef PTRACE_GET_THREAD_AREA | |
40 | #define PTRACE_GET_THREAD_AREA 25 | |
41 | #endif | |
42 | ||
43 | /* This definition comes from prctl.h, but some kernels may not have it. */ | |
44 | #ifndef PTRACE_ARCH_PRCTL | |
45 | #define PTRACE_ARCH_PRCTL 30 | |
46 | #endif | |
47 | ||
48 | /* The following definitions come from prctl.h, but may be absent | |
49 | for certain configurations. */ | |
50 | #ifndef ARCH_GET_FS | |
51 | #define ARCH_SET_GS 0x1001 | |
52 | #define ARCH_SET_FS 0x1002 | |
53 | #define ARCH_GET_FS 0x1003 | |
54 | #define ARCH_GET_GS 0x1004 | |
55 | #endif | |
56 | ||
aa5ca48f DE |
57 | /* Per-process arch-specific data we want to keep. */ |
58 | ||
59 | struct arch_process_info | |
60 | { | |
61 | struct i386_debug_reg_state debug_reg_state; | |
62 | }; | |
63 | ||
64 | /* Per-thread arch-specific data we want to keep. */ | |
65 | ||
66 | struct arch_lwp_info | |
67 | { | |
68 | /* Non-zero if our copy differs from what's recorded in the thread. */ | |
69 | int debug_registers_changed; | |
70 | }; | |
71 | ||
d0722149 DE |
72 | #ifdef __x86_64__ |
73 | ||
74 | /* Mapping between the general-purpose registers in `struct user' | |
75 | format and GDB's register array layout. | |
76 | Note that the transfer layout uses 64-bit regs. */ | |
77 | static /*const*/ int i386_regmap[] = | |
78 | { | |
79 | RAX * 8, RCX * 8, RDX * 8, RBX * 8, | |
80 | RSP * 8, RBP * 8, RSI * 8, RDI * 8, | |
81 | RIP * 8, EFLAGS * 8, CS * 8, SS * 8, | |
82 | DS * 8, ES * 8, FS * 8, GS * 8 | |
83 | }; | |
84 | ||
85 | #define I386_NUM_REGS (sizeof (i386_regmap) / sizeof (i386_regmap[0])) | |
86 | ||
87 | /* So code below doesn't have to care, i386 or amd64. */ | |
88 | #define ORIG_EAX ORIG_RAX | |
89 | ||
90 | static const int x86_64_regmap[] = | |
91 | { | |
92 | RAX * 8, RBX * 8, RCX * 8, RDX * 8, | |
93 | RSI * 8, RDI * 8, RBP * 8, RSP * 8, | |
94 | R8 * 8, R9 * 8, R10 * 8, R11 * 8, | |
95 | R12 * 8, R13 * 8, R14 * 8, R15 * 8, | |
96 | RIP * 8, EFLAGS * 8, CS * 8, SS * 8, | |
97 | DS * 8, ES * 8, FS * 8, GS * 8, | |
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, | |
101 | -1, -1, -1, -1, -1, -1, -1, -1, -1, | |
102 | ORIG_RAX * 8 | |
103 | }; | |
104 | ||
105 | #define X86_64_NUM_REGS (sizeof (x86_64_regmap) / sizeof (x86_64_regmap[0])) | |
106 | ||
107 | #else /* ! __x86_64__ */ | |
108 | ||
109 | /* Mapping between the general-purpose registers in `struct user' | |
110 | format and GDB's register array layout. */ | |
111 | static /*const*/ int i386_regmap[] = | |
112 | { | |
113 | EAX * 4, ECX * 4, EDX * 4, EBX * 4, | |
114 | UESP * 4, EBP * 4, ESI * 4, EDI * 4, | |
115 | EIP * 4, EFL * 4, CS * 4, SS * 4, | |
116 | DS * 4, ES * 4, FS * 4, GS * 4 | |
117 | }; | |
118 | ||
119 | #define I386_NUM_REGS (sizeof (i386_regmap) / sizeof (i386_regmap[0])) | |
120 | ||
121 | #endif | |
122 | \f | |
123 | /* Called by libthread_db. */ | |
124 | ||
125 | ps_err_e | |
126 | ps_get_thread_area (const struct ps_prochandle *ph, | |
127 | lwpid_t lwpid, int idx, void **base) | |
128 | { | |
129 | #ifdef __x86_64__ | |
130 | int use_64bit = register_size (0) == 8; | |
131 | ||
132 | if (use_64bit) | |
133 | { | |
134 | switch (idx) | |
135 | { | |
136 | case FS: | |
137 | if (ptrace (PTRACE_ARCH_PRCTL, lwpid, base, ARCH_GET_FS) == 0) | |
138 | return PS_OK; | |
139 | break; | |
140 | case GS: | |
141 | if (ptrace (PTRACE_ARCH_PRCTL, lwpid, base, ARCH_GET_GS) == 0) | |
142 | return PS_OK; | |
143 | break; | |
144 | default: | |
145 | return PS_BADADDR; | |
146 | } | |
147 | return PS_ERR; | |
148 | } | |
149 | #endif | |
150 | ||
151 | { | |
152 | unsigned int desc[4]; | |
153 | ||
154 | if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, | |
155 | (void *) (intptr_t) idx, (unsigned long) &desc) < 0) | |
156 | return PS_ERR; | |
157 | ||
158 | *(int *)base = desc[1]; | |
159 | return PS_OK; | |
160 | } | |
161 | } | |
162 | \f | |
163 | static int | |
164 | i386_cannot_store_register (int regno) | |
165 | { | |
166 | return regno >= I386_NUM_REGS; | |
167 | } | |
168 | ||
169 | static int | |
170 | i386_cannot_fetch_register (int regno) | |
171 | { | |
172 | return regno >= I386_NUM_REGS; | |
173 | } | |
174 | ||
175 | static void | |
442ea881 | 176 | x86_fill_gregset (struct regcache *regcache, void *buf) |
d0722149 DE |
177 | { |
178 | int i; | |
179 | ||
180 | #ifdef __x86_64__ | |
181 | if (register_size (0) == 8) | |
182 | { | |
183 | for (i = 0; i < X86_64_NUM_REGS; i++) | |
184 | if (x86_64_regmap[i] != -1) | |
442ea881 | 185 | collect_register (regcache, i, ((char *) buf) + x86_64_regmap[i]); |
d0722149 DE |
186 | return; |
187 | } | |
188 | #endif | |
189 | ||
190 | for (i = 0; i < I386_NUM_REGS; i++) | |
442ea881 | 191 | collect_register (regcache, i, ((char *) buf) + i386_regmap[i]); |
d0722149 | 192 | |
442ea881 PA |
193 | collect_register_by_name (regcache, "orig_eax", |
194 | ((char *) buf) + ORIG_EAX * 4); | |
d0722149 DE |
195 | } |
196 | ||
197 | static void | |
442ea881 | 198 | x86_store_gregset (struct regcache *regcache, const void *buf) |
d0722149 DE |
199 | { |
200 | int i; | |
201 | ||
202 | #ifdef __x86_64__ | |
203 | if (register_size (0) == 8) | |
204 | { | |
205 | for (i = 0; i < X86_64_NUM_REGS; i++) | |
206 | if (x86_64_regmap[i] != -1) | |
442ea881 | 207 | supply_register (regcache, i, ((char *) buf) + x86_64_regmap[i]); |
d0722149 DE |
208 | return; |
209 | } | |
210 | #endif | |
211 | ||
212 | for (i = 0; i < I386_NUM_REGS; i++) | |
442ea881 | 213 | supply_register (regcache, i, ((char *) buf) + i386_regmap[i]); |
d0722149 | 214 | |
442ea881 PA |
215 | supply_register_by_name (regcache, "orig_eax", |
216 | ((char *) buf) + ORIG_EAX * 4); | |
d0722149 DE |
217 | } |
218 | ||
219 | static void | |
442ea881 | 220 | x86_fill_fpregset (struct regcache *regcache, void *buf) |
d0722149 DE |
221 | { |
222 | #ifdef __x86_64__ | |
442ea881 | 223 | i387_cache_to_fxsave (regcache, buf); |
d0722149 | 224 | #else |
442ea881 | 225 | i387_cache_to_fsave (regcache, buf); |
d0722149 DE |
226 | #endif |
227 | } | |
228 | ||
229 | static void | |
442ea881 | 230 | x86_store_fpregset (struct regcache *regcache, const void *buf) |
d0722149 DE |
231 | { |
232 | #ifdef __x86_64__ | |
442ea881 | 233 | i387_fxsave_to_cache (regcache, buf); |
d0722149 | 234 | #else |
442ea881 | 235 | i387_fsave_to_cache (regcache, buf); |
d0722149 DE |
236 | #endif |
237 | } | |
238 | ||
239 | #ifndef __x86_64__ | |
240 | ||
241 | static void | |
442ea881 | 242 | x86_fill_fpxregset (struct regcache *regcache, void *buf) |
d0722149 | 243 | { |
442ea881 | 244 | i387_cache_to_fxsave (regcache, buf); |
d0722149 DE |
245 | } |
246 | ||
247 | static void | |
442ea881 | 248 | x86_store_fpxregset (struct regcache *regcache, const void *buf) |
d0722149 | 249 | { |
442ea881 | 250 | i387_fxsave_to_cache (regcache, buf); |
d0722149 DE |
251 | } |
252 | ||
253 | #endif | |
254 | ||
255 | /* ??? The non-biarch i386 case stores all the i387 regs twice. | |
256 | Once in i387_.*fsave.* and once in i387_.*fxsave.*. | |
257 | This is, presumably, to handle the case where PTRACE_[GS]ETFPXREGS | |
258 | doesn't work. IWBN to avoid the duplication in the case where it | |
259 | does work. Maybe the arch_setup routine could check whether it works | |
260 | and update target_regsets accordingly, maybe by moving target_regsets | |
261 | to linux_target_ops and set the right one there, rather than having to | |
262 | modify the target_regsets global. */ | |
263 | ||
264 | struct regset_info target_regsets[] = | |
265 | { | |
266 | #ifdef HAVE_PTRACE_GETREGS | |
267 | { PTRACE_GETREGS, PTRACE_SETREGS, sizeof (elf_gregset_t), | |
268 | GENERAL_REGS, | |
269 | x86_fill_gregset, x86_store_gregset }, | |
270 | # ifndef __x86_64__ | |
271 | # ifdef HAVE_PTRACE_GETFPXREGS | |
272 | { PTRACE_GETFPXREGS, PTRACE_SETFPXREGS, sizeof (elf_fpxregset_t), | |
273 | EXTENDED_REGS, | |
274 | x86_fill_fpxregset, x86_store_fpxregset }, | |
275 | # endif | |
276 | # endif | |
277 | { PTRACE_GETFPREGS, PTRACE_SETFPREGS, sizeof (elf_fpregset_t), | |
278 | FP_REGS, | |
279 | x86_fill_fpregset, x86_store_fpregset }, | |
280 | #endif /* HAVE_PTRACE_GETREGS */ | |
281 | { 0, 0, -1, -1, NULL, NULL } | |
282 | }; | |
283 | ||
284 | static CORE_ADDR | |
442ea881 | 285 | x86_get_pc (struct regcache *regcache) |
d0722149 DE |
286 | { |
287 | int use_64bit = register_size (0) == 8; | |
288 | ||
289 | if (use_64bit) | |
290 | { | |
291 | unsigned long pc; | |
442ea881 | 292 | collect_register_by_name (regcache, "rip", &pc); |
d0722149 DE |
293 | return (CORE_ADDR) pc; |
294 | } | |
295 | else | |
296 | { | |
297 | unsigned int pc; | |
442ea881 | 298 | collect_register_by_name (regcache, "eip", &pc); |
d0722149 DE |
299 | return (CORE_ADDR) pc; |
300 | } | |
301 | } | |
302 | ||
303 | static void | |
442ea881 | 304 | x86_set_pc (struct regcache *regcache, CORE_ADDR pc) |
d0722149 DE |
305 | { |
306 | int use_64bit = register_size (0) == 8; | |
307 | ||
308 | if (use_64bit) | |
309 | { | |
310 | unsigned long newpc = pc; | |
442ea881 | 311 | supply_register_by_name (regcache, "rip", &newpc); |
d0722149 DE |
312 | } |
313 | else | |
314 | { | |
315 | unsigned int newpc = pc; | |
442ea881 | 316 | supply_register_by_name (regcache, "eip", &newpc); |
d0722149 DE |
317 | } |
318 | } | |
319 | \f | |
320 | static const unsigned char x86_breakpoint[] = { 0xCC }; | |
321 | #define x86_breakpoint_len 1 | |
322 | ||
323 | static int | |
324 | x86_breakpoint_at (CORE_ADDR pc) | |
325 | { | |
326 | unsigned char c; | |
327 | ||
fc7238bb | 328 | (*the_target->read_memory) (pc, &c, 1); |
d0722149 DE |
329 | if (c == 0xCC) |
330 | return 1; | |
331 | ||
332 | return 0; | |
333 | } | |
334 | \f | |
aa5ca48f DE |
335 | /* Support for debug registers. */ |
336 | ||
337 | static unsigned long | |
338 | x86_linux_dr_get (ptid_t ptid, int regnum) | |
339 | { | |
340 | int tid; | |
341 | unsigned long value; | |
342 | ||
343 | tid = ptid_get_lwp (ptid); | |
344 | ||
345 | errno = 0; | |
346 | value = ptrace (PTRACE_PEEKUSER, tid, | |
347 | offsetof (struct user, u_debugreg[regnum]), 0); | |
348 | if (errno != 0) | |
349 | error ("Couldn't read debug register"); | |
350 | ||
351 | return value; | |
352 | } | |
353 | ||
354 | static void | |
355 | x86_linux_dr_set (ptid_t ptid, int regnum, unsigned long value) | |
356 | { | |
357 | int tid; | |
358 | ||
359 | tid = ptid_get_lwp (ptid); | |
360 | ||
361 | errno = 0; | |
362 | ptrace (PTRACE_POKEUSER, tid, | |
363 | offsetof (struct user, u_debugreg[regnum]), value); | |
364 | if (errno != 0) | |
365 | error ("Couldn't write debug register"); | |
366 | } | |
367 | ||
368 | /* Update the inferior's debug register REGNUM from STATE. */ | |
369 | ||
370 | void | |
371 | i386_dr_low_set_addr (const struct i386_debug_reg_state *state, int regnum) | |
372 | { | |
373 | struct inferior_list_entry *lp; | |
374 | CORE_ADDR addr; | |
375 | /* Only need to update the threads of this process. */ | |
376 | int pid = pid_of (get_thread_lwp (current_inferior)); | |
377 | ||
378 | if (! (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR)) | |
379 | fatal ("Invalid debug register %d", regnum); | |
380 | ||
381 | addr = state->dr_mirror[regnum]; | |
382 | ||
383 | for (lp = all_lwps.head; lp; lp = lp->next) | |
384 | { | |
385 | struct lwp_info *lwp = (struct lwp_info *) lp; | |
386 | ||
387 | /* The actual update is done later, we just mark that the register | |
388 | needs updating. */ | |
389 | if (pid_of (lwp) == pid) | |
390 | lwp->arch_private->debug_registers_changed = 1; | |
391 | } | |
392 | } | |
393 | ||
394 | /* Update the inferior's DR7 debug control register from STATE. */ | |
395 | ||
396 | void | |
397 | i386_dr_low_set_control (const struct i386_debug_reg_state *state) | |
398 | { | |
399 | struct inferior_list_entry *lp; | |
400 | /* Only need to update the threads of this process. */ | |
401 | int pid = pid_of (get_thread_lwp (current_inferior)); | |
402 | ||
403 | for (lp = all_lwps.head; lp; lp = lp->next) | |
404 | { | |
405 | struct lwp_info *lwp = (struct lwp_info *) lp; | |
406 | ||
407 | /* The actual update is done later, we just mark that the register | |
408 | needs updating. */ | |
409 | if (pid_of (lwp) == pid) | |
410 | lwp->arch_private->debug_registers_changed = 1; | |
411 | } | |
412 | } | |
413 | ||
414 | /* Get the value of the DR6 debug status register from the inferior | |
415 | and record it in STATE. */ | |
416 | ||
417 | void | |
418 | i386_dr_low_get_status (struct i386_debug_reg_state *state) | |
419 | { | |
420 | struct lwp_info *lwp = get_thread_lwp (current_inferior); | |
421 | ptid_t ptid = ptid_of (lwp); | |
422 | ||
423 | state->dr_status_mirror = x86_linux_dr_get (ptid, DR_STATUS); | |
424 | } | |
425 | \f | |
426 | /* Watchpoint support. */ | |
427 | ||
428 | static int | |
429 | x86_insert_point (char type, CORE_ADDR addr, int len) | |
430 | { | |
431 | struct process_info *proc = current_process (); | |
432 | switch (type) | |
433 | { | |
8b07ae33 PA |
434 | case '0': |
435 | return set_gdb_breakpoint_at (addr); | |
aa5ca48f DE |
436 | case '2': |
437 | case '3': | |
438 | case '4': | |
439 | return i386_low_insert_watchpoint (&proc->private->arch_private->debug_reg_state, | |
440 | type, addr, len); | |
441 | default: | |
442 | /* Unsupported. */ | |
443 | return 1; | |
444 | } | |
445 | } | |
446 | ||
447 | static int | |
448 | x86_remove_point (char type, CORE_ADDR addr, int len) | |
449 | { | |
450 | struct process_info *proc = current_process (); | |
451 | switch (type) | |
452 | { | |
8b07ae33 PA |
453 | case '0': |
454 | return delete_gdb_breakpoint_at (addr); | |
aa5ca48f DE |
455 | case '2': |
456 | case '3': | |
457 | case '4': | |
458 | return i386_low_remove_watchpoint (&proc->private->arch_private->debug_reg_state, | |
459 | type, addr, len); | |
460 | default: | |
461 | /* Unsupported. */ | |
462 | return 1; | |
463 | } | |
464 | } | |
465 | ||
466 | static int | |
467 | x86_stopped_by_watchpoint (void) | |
468 | { | |
469 | struct process_info *proc = current_process (); | |
470 | return i386_low_stopped_by_watchpoint (&proc->private->arch_private->debug_reg_state); | |
471 | } | |
472 | ||
473 | static CORE_ADDR | |
474 | x86_stopped_data_address (void) | |
475 | { | |
476 | struct process_info *proc = current_process (); | |
477 | CORE_ADDR addr; | |
478 | if (i386_low_stopped_data_address (&proc->private->arch_private->debug_reg_state, | |
479 | &addr)) | |
480 | return addr; | |
481 | return 0; | |
482 | } | |
483 | \f | |
484 | /* Called when a new process is created. */ | |
485 | ||
486 | static struct arch_process_info * | |
487 | x86_linux_new_process (void) | |
488 | { | |
489 | struct arch_process_info *info = xcalloc (1, sizeof (*info)); | |
490 | ||
491 | i386_low_init_dregs (&info->debug_reg_state); | |
492 | ||
493 | return info; | |
494 | } | |
495 | ||
496 | /* Called when a new thread is detected. */ | |
497 | ||
498 | static struct arch_lwp_info * | |
499 | x86_linux_new_thread (void) | |
500 | { | |
501 | struct arch_lwp_info *info = xcalloc (1, sizeof (*info)); | |
502 | ||
503 | info->debug_registers_changed = 1; | |
504 | ||
505 | return info; | |
506 | } | |
507 | ||
508 | /* Called when resuming a thread. | |
509 | If the debug regs have changed, update the thread's copies. */ | |
510 | ||
511 | static void | |
512 | x86_linux_prepare_to_resume (struct lwp_info *lwp) | |
513 | { | |
b9a881c2 PA |
514 | ptid_t ptid = ptid_of (lwp); |
515 | ||
aa5ca48f DE |
516 | if (lwp->arch_private->debug_registers_changed) |
517 | { | |
518 | int i; | |
aa5ca48f DE |
519 | int pid = ptid_get_pid (ptid); |
520 | struct process_info *proc = find_process_pid (pid); | |
521 | struct i386_debug_reg_state *state = &proc->private->arch_private->debug_reg_state; | |
522 | ||
523 | for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++) | |
524 | x86_linux_dr_set (ptid, i, state->dr_mirror[i]); | |
525 | ||
526 | x86_linux_dr_set (ptid, DR_CONTROL, state->dr_control_mirror); | |
527 | ||
528 | lwp->arch_private->debug_registers_changed = 0; | |
529 | } | |
b9a881c2 PA |
530 | |
531 | if (lwp->stopped_by_watchpoint) | |
532 | x86_linux_dr_set (ptid, DR_STATUS, 0); | |
aa5ca48f DE |
533 | } |
534 | \f | |
d0722149 DE |
535 | /* When GDBSERVER is built as a 64-bit application on linux, the |
536 | PTRACE_GETSIGINFO data is always presented in 64-bit layout. Since | |
537 | debugging a 32-bit inferior with a 64-bit GDBSERVER should look the same | |
538 | as debugging it with a 32-bit GDBSERVER, we do the 32-bit <-> 64-bit | |
539 | conversion in-place ourselves. */ | |
540 | ||
541 | /* These types below (compat_*) define a siginfo type that is layout | |
542 | compatible with the siginfo type exported by the 32-bit userspace | |
543 | support. */ | |
544 | ||
545 | #ifdef __x86_64__ | |
546 | ||
547 | typedef int compat_int_t; | |
548 | typedef unsigned int compat_uptr_t; | |
549 | ||
550 | typedef int compat_time_t; | |
551 | typedef int compat_timer_t; | |
552 | typedef int compat_clock_t; | |
553 | ||
554 | struct compat_timeval | |
555 | { | |
556 | compat_time_t tv_sec; | |
557 | int tv_usec; | |
558 | }; | |
559 | ||
560 | typedef union compat_sigval | |
561 | { | |
562 | compat_int_t sival_int; | |
563 | compat_uptr_t sival_ptr; | |
564 | } compat_sigval_t; | |
565 | ||
566 | typedef struct compat_siginfo | |
567 | { | |
568 | int si_signo; | |
569 | int si_errno; | |
570 | int si_code; | |
571 | ||
572 | union | |
573 | { | |
574 | int _pad[((128 / sizeof (int)) - 3)]; | |
575 | ||
576 | /* kill() */ | |
577 | struct | |
578 | { | |
579 | unsigned int _pid; | |
580 | unsigned int _uid; | |
581 | } _kill; | |
582 | ||
583 | /* POSIX.1b timers */ | |
584 | struct | |
585 | { | |
586 | compat_timer_t _tid; | |
587 | int _overrun; | |
588 | compat_sigval_t _sigval; | |
589 | } _timer; | |
590 | ||
591 | /* POSIX.1b signals */ | |
592 | struct | |
593 | { | |
594 | unsigned int _pid; | |
595 | unsigned int _uid; | |
596 | compat_sigval_t _sigval; | |
597 | } _rt; | |
598 | ||
599 | /* SIGCHLD */ | |
600 | struct | |
601 | { | |
602 | unsigned int _pid; | |
603 | unsigned int _uid; | |
604 | int _status; | |
605 | compat_clock_t _utime; | |
606 | compat_clock_t _stime; | |
607 | } _sigchld; | |
608 | ||
609 | /* SIGILL, SIGFPE, SIGSEGV, SIGBUS */ | |
610 | struct | |
611 | { | |
612 | unsigned int _addr; | |
613 | } _sigfault; | |
614 | ||
615 | /* SIGPOLL */ | |
616 | struct | |
617 | { | |
618 | int _band; | |
619 | int _fd; | |
620 | } _sigpoll; | |
621 | } _sifields; | |
622 | } compat_siginfo_t; | |
623 | ||
624 | #define cpt_si_pid _sifields._kill._pid | |
625 | #define cpt_si_uid _sifields._kill._uid | |
626 | #define cpt_si_timerid _sifields._timer._tid | |
627 | #define cpt_si_overrun _sifields._timer._overrun | |
628 | #define cpt_si_status _sifields._sigchld._status | |
629 | #define cpt_si_utime _sifields._sigchld._utime | |
630 | #define cpt_si_stime _sifields._sigchld._stime | |
631 | #define cpt_si_ptr _sifields._rt._sigval.sival_ptr | |
632 | #define cpt_si_addr _sifields._sigfault._addr | |
633 | #define cpt_si_band _sifields._sigpoll._band | |
634 | #define cpt_si_fd _sifields._sigpoll._fd | |
635 | ||
636 | /* glibc at least up to 2.3.2 doesn't have si_timerid, si_overrun. | |
637 | In their place is si_timer1,si_timer2. */ | |
638 | #ifndef si_timerid | |
639 | #define si_timerid si_timer1 | |
640 | #endif | |
641 | #ifndef si_overrun | |
642 | #define si_overrun si_timer2 | |
643 | #endif | |
644 | ||
645 | static void | |
646 | compat_siginfo_from_siginfo (compat_siginfo_t *to, siginfo_t *from) | |
647 | { | |
648 | memset (to, 0, sizeof (*to)); | |
649 | ||
650 | to->si_signo = from->si_signo; | |
651 | to->si_errno = from->si_errno; | |
652 | to->si_code = from->si_code; | |
653 | ||
654 | if (to->si_code < 0) | |
655 | { | |
656 | to->cpt_si_ptr = (intptr_t) from->si_ptr; | |
657 | } | |
658 | else if (to->si_code == SI_USER) | |
659 | { | |
660 | to->cpt_si_pid = from->si_pid; | |
661 | to->cpt_si_uid = from->si_uid; | |
662 | } | |
663 | else if (to->si_code == SI_TIMER) | |
664 | { | |
665 | to->cpt_si_timerid = from->si_timerid; | |
666 | to->cpt_si_overrun = from->si_overrun; | |
667 | to->cpt_si_ptr = (intptr_t) from->si_ptr; | |
668 | } | |
669 | else | |
670 | { | |
671 | switch (to->si_signo) | |
672 | { | |
673 | case SIGCHLD: | |
674 | to->cpt_si_pid = from->si_pid; | |
675 | to->cpt_si_uid = from->si_uid; | |
676 | to->cpt_si_status = from->si_status; | |
677 | to->cpt_si_utime = from->si_utime; | |
678 | to->cpt_si_stime = from->si_stime; | |
679 | break; | |
680 | case SIGILL: | |
681 | case SIGFPE: | |
682 | case SIGSEGV: | |
683 | case SIGBUS: | |
684 | to->cpt_si_addr = (intptr_t) from->si_addr; | |
685 | break; | |
686 | case SIGPOLL: | |
687 | to->cpt_si_band = from->si_band; | |
688 | to->cpt_si_fd = from->si_fd; | |
689 | break; | |
690 | default: | |
691 | to->cpt_si_pid = from->si_pid; | |
692 | to->cpt_si_uid = from->si_uid; | |
693 | to->cpt_si_ptr = (intptr_t) from->si_ptr; | |
694 | break; | |
695 | } | |
696 | } | |
697 | } | |
698 | ||
699 | static void | |
700 | siginfo_from_compat_siginfo (siginfo_t *to, compat_siginfo_t *from) | |
701 | { | |
702 | memset (to, 0, sizeof (*to)); | |
703 | ||
704 | to->si_signo = from->si_signo; | |
705 | to->si_errno = from->si_errno; | |
706 | to->si_code = from->si_code; | |
707 | ||
708 | if (to->si_code < 0) | |
709 | { | |
710 | to->si_ptr = (void *) (intptr_t) from->cpt_si_ptr; | |
711 | } | |
712 | else if (to->si_code == SI_USER) | |
713 | { | |
714 | to->si_pid = from->cpt_si_pid; | |
715 | to->si_uid = from->cpt_si_uid; | |
716 | } | |
717 | else if (to->si_code == SI_TIMER) | |
718 | { | |
719 | to->si_timerid = from->cpt_si_timerid; | |
720 | to->si_overrun = from->cpt_si_overrun; | |
721 | to->si_ptr = (void *) (intptr_t) from->cpt_si_ptr; | |
722 | } | |
723 | else | |
724 | { | |
725 | switch (to->si_signo) | |
726 | { | |
727 | case SIGCHLD: | |
728 | to->si_pid = from->cpt_si_pid; | |
729 | to->si_uid = from->cpt_si_uid; | |
730 | to->si_status = from->cpt_si_status; | |
731 | to->si_utime = from->cpt_si_utime; | |
732 | to->si_stime = from->cpt_si_stime; | |
733 | break; | |
734 | case SIGILL: | |
735 | case SIGFPE: | |
736 | case SIGSEGV: | |
737 | case SIGBUS: | |
738 | to->si_addr = (void *) (intptr_t) from->cpt_si_addr; | |
739 | break; | |
740 | case SIGPOLL: | |
741 | to->si_band = from->cpt_si_band; | |
742 | to->si_fd = from->cpt_si_fd; | |
743 | break; | |
744 | default: | |
745 | to->si_pid = from->cpt_si_pid; | |
746 | to->si_uid = from->cpt_si_uid; | |
747 | to->si_ptr = (void* ) (intptr_t) from->cpt_si_ptr; | |
748 | break; | |
749 | } | |
750 | } | |
751 | } | |
752 | ||
753 | #endif /* __x86_64__ */ | |
754 | ||
755 | /* Convert a native/host siginfo object, into/from the siginfo in the | |
756 | layout of the inferiors' architecture. Returns true if any | |
757 | conversion was done; false otherwise. If DIRECTION is 1, then copy | |
758 | from INF to NATIVE. If DIRECTION is 0, copy from NATIVE to | |
759 | INF. */ | |
760 | ||
761 | static int | |
762 | x86_siginfo_fixup (struct siginfo *native, void *inf, int direction) | |
763 | { | |
764 | #ifdef __x86_64__ | |
765 | /* Is the inferior 32-bit? If so, then fixup the siginfo object. */ | |
766 | if (register_size (0) == 4) | |
767 | { | |
9f1036c1 DE |
768 | if (sizeof (struct siginfo) != sizeof (compat_siginfo_t)) |
769 | fatal ("unexpected difference in siginfo"); | |
d0722149 DE |
770 | |
771 | if (direction == 0) | |
772 | compat_siginfo_from_siginfo ((struct compat_siginfo *) inf, native); | |
773 | else | |
774 | siginfo_from_compat_siginfo (native, (struct compat_siginfo *) inf); | |
775 | ||
776 | return 1; | |
777 | } | |
778 | #endif | |
779 | ||
780 | return 0; | |
781 | } | |
782 | \f | |
9f1036c1 | 783 | /* Initialize gdbserver for the architecture of the inferior. */ |
d0722149 DE |
784 | |
785 | static void | |
786 | x86_arch_setup (void) | |
787 | { | |
788 | #ifdef __x86_64__ | |
789 | int pid = pid_of (get_thread_lwp (current_inferior)); | |
790 | char *file = linux_child_pid_to_exec_file (pid); | |
791 | int use_64bit = elf_64_file_p (file); | |
792 | ||
793 | free (file); | |
794 | ||
795 | if (use_64bit < 0) | |
796 | { | |
797 | /* This can only happen if /proc/<pid>/exe is unreadable, | |
798 | but "that can't happen" if we've gotten this far. | |
799 | Fall through and assume this is a 32-bit program. */ | |
800 | } | |
801 | else if (use_64bit) | |
802 | { | |
90884b2b | 803 | init_registers_amd64_linux (); |
d0722149 DE |
804 | |
805 | /* Amd64 doesn't have HAVE_LINUX_USRREGS. */ | |
806 | the_low_target.num_regs = -1; | |
807 | the_low_target.regmap = NULL; | |
808 | the_low_target.cannot_fetch_register = NULL; | |
809 | the_low_target.cannot_store_register = NULL; | |
810 | ||
811 | /* Amd64 has 16 xmm regs. */ | |
812 | num_xmm_registers = 16; | |
813 | ||
814 | return; | |
815 | } | |
816 | #endif | |
817 | ||
818 | /* Ok we have a 32-bit inferior. */ | |
819 | ||
820 | init_registers_i386_linux (); | |
821 | ||
822 | the_low_target.num_regs = I386_NUM_REGS; | |
823 | the_low_target.regmap = i386_regmap; | |
824 | the_low_target.cannot_fetch_register = i386_cannot_fetch_register; | |
825 | the_low_target.cannot_store_register = i386_cannot_store_register; | |
826 | ||
827 | /* I386 has 8 xmm regs. */ | |
828 | num_xmm_registers = 8; | |
829 | } | |
830 | ||
831 | /* This is initialized assuming an amd64 target. | |
832 | x86_arch_setup will correct it for i386 or amd64 targets. */ | |
833 | ||
834 | struct linux_target_ops the_low_target = | |
835 | { | |
836 | x86_arch_setup, | |
837 | -1, | |
838 | NULL, | |
839 | NULL, | |
840 | NULL, | |
841 | x86_get_pc, | |
842 | x86_set_pc, | |
843 | x86_breakpoint, | |
844 | x86_breakpoint_len, | |
845 | NULL, | |
846 | 1, | |
847 | x86_breakpoint_at, | |
aa5ca48f DE |
848 | x86_insert_point, |
849 | x86_remove_point, | |
850 | x86_stopped_by_watchpoint, | |
851 | x86_stopped_data_address, | |
d0722149 DE |
852 | /* collect_ptrace_register/supply_ptrace_register are not needed in the |
853 | native i386 case (no registers smaller than an xfer unit), and are not | |
854 | used in the biarch case (HAVE_LINUX_USRREGS is not defined). */ | |
855 | NULL, | |
856 | NULL, | |
857 | /* need to fix up i386 siginfo if host is amd64 */ | |
858 | x86_siginfo_fixup, | |
aa5ca48f DE |
859 | x86_linux_new_process, |
860 | x86_linux_new_thread, | |
861 | x86_linux_prepare_to_resume | |
d0722149 | 862 | }; |