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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 | ||
d0722149 DE |
30 | /* Defined in auto-generated file reg-i386-linux.c. */ |
31 | void init_registers_i386_linux (void); | |
32 | /* Defined in auto-generated file reg-x86-64-linux.c. */ | |
33 | void init_registers_x86_64_linux (void); | |
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 | |
176 | x86_fill_gregset (void *buf) | |
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) | |
185 | collect_register (i, ((char *) buf) + x86_64_regmap[i]); | |
186 | return; | |
187 | } | |
188 | #endif | |
189 | ||
190 | for (i = 0; i < I386_NUM_REGS; i++) | |
191 | collect_register (i, ((char *) buf) + i386_regmap[i]); | |
192 | ||
193 | collect_register_by_name ("orig_eax", ((char *) buf) + ORIG_EAX * 4); | |
194 | } | |
195 | ||
196 | static void | |
197 | x86_store_gregset (const void *buf) | |
198 | { | |
199 | int i; | |
200 | ||
201 | #ifdef __x86_64__ | |
202 | if (register_size (0) == 8) | |
203 | { | |
204 | for (i = 0; i < X86_64_NUM_REGS; i++) | |
205 | if (x86_64_regmap[i] != -1) | |
206 | supply_register (i, ((char *) buf) + x86_64_regmap[i]); | |
207 | return; | |
208 | } | |
209 | #endif | |
210 | ||
211 | for (i = 0; i < I386_NUM_REGS; i++) | |
212 | supply_register (i, ((char *) buf) + i386_regmap[i]); | |
213 | ||
214 | supply_register_by_name ("orig_eax", ((char *) buf) + ORIG_EAX * 4); | |
215 | } | |
216 | ||
217 | static void | |
218 | x86_fill_fpregset (void *buf) | |
219 | { | |
220 | #ifdef __x86_64__ | |
221 | i387_cache_to_fxsave (buf); | |
222 | #else | |
223 | i387_cache_to_fsave (buf); | |
224 | #endif | |
225 | } | |
226 | ||
227 | static void | |
228 | x86_store_fpregset (const void *buf) | |
229 | { | |
230 | #ifdef __x86_64__ | |
231 | i387_fxsave_to_cache (buf); | |
232 | #else | |
233 | i387_fsave_to_cache (buf); | |
234 | #endif | |
235 | } | |
236 | ||
237 | #ifndef __x86_64__ | |
238 | ||
239 | static void | |
240 | x86_fill_fpxregset (void *buf) | |
241 | { | |
242 | i387_cache_to_fxsave (buf); | |
243 | } | |
244 | ||
245 | static void | |
246 | x86_store_fpxregset (const void *buf) | |
247 | { | |
248 | i387_fxsave_to_cache (buf); | |
249 | } | |
250 | ||
251 | #endif | |
252 | ||
253 | /* ??? The non-biarch i386 case stores all the i387 regs twice. | |
254 | Once in i387_.*fsave.* and once in i387_.*fxsave.*. | |
255 | This is, presumably, to handle the case where PTRACE_[GS]ETFPXREGS | |
256 | doesn't work. IWBN to avoid the duplication in the case where it | |
257 | does work. Maybe the arch_setup routine could check whether it works | |
258 | and update target_regsets accordingly, maybe by moving target_regsets | |
259 | to linux_target_ops and set the right one there, rather than having to | |
260 | modify the target_regsets global. */ | |
261 | ||
262 | struct regset_info target_regsets[] = | |
263 | { | |
264 | #ifdef HAVE_PTRACE_GETREGS | |
265 | { PTRACE_GETREGS, PTRACE_SETREGS, sizeof (elf_gregset_t), | |
266 | GENERAL_REGS, | |
267 | x86_fill_gregset, x86_store_gregset }, | |
268 | # ifndef __x86_64__ | |
269 | # ifdef HAVE_PTRACE_GETFPXREGS | |
270 | { PTRACE_GETFPXREGS, PTRACE_SETFPXREGS, sizeof (elf_fpxregset_t), | |
271 | EXTENDED_REGS, | |
272 | x86_fill_fpxregset, x86_store_fpxregset }, | |
273 | # endif | |
274 | # endif | |
275 | { PTRACE_GETFPREGS, PTRACE_SETFPREGS, sizeof (elf_fpregset_t), | |
276 | FP_REGS, | |
277 | x86_fill_fpregset, x86_store_fpregset }, | |
278 | #endif /* HAVE_PTRACE_GETREGS */ | |
279 | { 0, 0, -1, -1, NULL, NULL } | |
280 | }; | |
281 | ||
282 | static CORE_ADDR | |
283 | x86_get_pc (void) | |
284 | { | |
285 | int use_64bit = register_size (0) == 8; | |
286 | ||
287 | if (use_64bit) | |
288 | { | |
289 | unsigned long pc; | |
290 | collect_register_by_name ("rip", &pc); | |
291 | return (CORE_ADDR) pc; | |
292 | } | |
293 | else | |
294 | { | |
295 | unsigned int pc; | |
296 | collect_register_by_name ("eip", &pc); | |
297 | return (CORE_ADDR) pc; | |
298 | } | |
299 | } | |
300 | ||
301 | static void | |
302 | x86_set_pc (CORE_ADDR pc) | |
303 | { | |
304 | int use_64bit = register_size (0) == 8; | |
305 | ||
306 | if (use_64bit) | |
307 | { | |
308 | unsigned long newpc = pc; | |
309 | supply_register_by_name ("rip", &newpc); | |
310 | } | |
311 | else | |
312 | { | |
313 | unsigned int newpc = pc; | |
314 | supply_register_by_name ("eip", &newpc); | |
315 | } | |
316 | } | |
317 | \f | |
318 | static const unsigned char x86_breakpoint[] = { 0xCC }; | |
319 | #define x86_breakpoint_len 1 | |
320 | ||
321 | static int | |
322 | x86_breakpoint_at (CORE_ADDR pc) | |
323 | { | |
324 | unsigned char c; | |
325 | ||
326 | read_inferior_memory (pc, &c, 1); | |
327 | if (c == 0xCC) | |
328 | return 1; | |
329 | ||
330 | return 0; | |
331 | } | |
332 | \f | |
aa5ca48f DE |
333 | /* Support for debug registers. */ |
334 | ||
335 | static unsigned long | |
336 | x86_linux_dr_get (ptid_t ptid, int regnum) | |
337 | { | |
338 | int tid; | |
339 | unsigned long value; | |
340 | ||
341 | tid = ptid_get_lwp (ptid); | |
342 | ||
343 | errno = 0; | |
344 | value = ptrace (PTRACE_PEEKUSER, tid, | |
345 | offsetof (struct user, u_debugreg[regnum]), 0); | |
346 | if (errno != 0) | |
347 | error ("Couldn't read debug register"); | |
348 | ||
349 | return value; | |
350 | } | |
351 | ||
352 | static void | |
353 | x86_linux_dr_set (ptid_t ptid, int regnum, unsigned long value) | |
354 | { | |
355 | int tid; | |
356 | ||
357 | tid = ptid_get_lwp (ptid); | |
358 | ||
359 | errno = 0; | |
360 | ptrace (PTRACE_POKEUSER, tid, | |
361 | offsetof (struct user, u_debugreg[regnum]), value); | |
362 | if (errno != 0) | |
363 | error ("Couldn't write debug register"); | |
364 | } | |
365 | ||
366 | /* Update the inferior's debug register REGNUM from STATE. */ | |
367 | ||
368 | void | |
369 | i386_dr_low_set_addr (const struct i386_debug_reg_state *state, int regnum) | |
370 | { | |
371 | struct inferior_list_entry *lp; | |
372 | CORE_ADDR addr; | |
373 | /* Only need to update the threads of this process. */ | |
374 | int pid = pid_of (get_thread_lwp (current_inferior)); | |
375 | ||
376 | if (! (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR)) | |
377 | fatal ("Invalid debug register %d", regnum); | |
378 | ||
379 | addr = state->dr_mirror[regnum]; | |
380 | ||
381 | for (lp = all_lwps.head; lp; lp = lp->next) | |
382 | { | |
383 | struct lwp_info *lwp = (struct lwp_info *) lp; | |
384 | ||
385 | /* The actual update is done later, we just mark that the register | |
386 | needs updating. */ | |
387 | if (pid_of (lwp) == pid) | |
388 | lwp->arch_private->debug_registers_changed = 1; | |
389 | } | |
390 | } | |
391 | ||
392 | /* Update the inferior's DR7 debug control register from STATE. */ | |
393 | ||
394 | void | |
395 | i386_dr_low_set_control (const struct i386_debug_reg_state *state) | |
396 | { | |
397 | struct inferior_list_entry *lp; | |
398 | /* Only need to update the threads of this process. */ | |
399 | int pid = pid_of (get_thread_lwp (current_inferior)); | |
400 | ||
401 | for (lp = all_lwps.head; lp; lp = lp->next) | |
402 | { | |
403 | struct lwp_info *lwp = (struct lwp_info *) lp; | |
404 | ||
405 | /* The actual update is done later, we just mark that the register | |
406 | needs updating. */ | |
407 | if (pid_of (lwp) == pid) | |
408 | lwp->arch_private->debug_registers_changed = 1; | |
409 | } | |
410 | } | |
411 | ||
412 | /* Get the value of the DR6 debug status register from the inferior | |
413 | and record it in STATE. */ | |
414 | ||
415 | void | |
416 | i386_dr_low_get_status (struct i386_debug_reg_state *state) | |
417 | { | |
418 | struct lwp_info *lwp = get_thread_lwp (current_inferior); | |
419 | ptid_t ptid = ptid_of (lwp); | |
420 | ||
421 | state->dr_status_mirror = x86_linux_dr_get (ptid, DR_STATUS); | |
422 | } | |
423 | \f | |
424 | /* Watchpoint support. */ | |
425 | ||
426 | static int | |
427 | x86_insert_point (char type, CORE_ADDR addr, int len) | |
428 | { | |
429 | struct process_info *proc = current_process (); | |
430 | switch (type) | |
431 | { | |
432 | case '2': | |
433 | case '3': | |
434 | case '4': | |
435 | return i386_low_insert_watchpoint (&proc->private->arch_private->debug_reg_state, | |
436 | type, addr, len); | |
437 | default: | |
438 | /* Unsupported. */ | |
439 | return 1; | |
440 | } | |
441 | } | |
442 | ||
443 | static int | |
444 | x86_remove_point (char type, CORE_ADDR addr, int len) | |
445 | { | |
446 | struct process_info *proc = current_process (); | |
447 | switch (type) | |
448 | { | |
449 | case '2': | |
450 | case '3': | |
451 | case '4': | |
452 | return i386_low_remove_watchpoint (&proc->private->arch_private->debug_reg_state, | |
453 | type, addr, len); | |
454 | default: | |
455 | /* Unsupported. */ | |
456 | return 1; | |
457 | } | |
458 | } | |
459 | ||
460 | static int | |
461 | x86_stopped_by_watchpoint (void) | |
462 | { | |
463 | struct process_info *proc = current_process (); | |
464 | return i386_low_stopped_by_watchpoint (&proc->private->arch_private->debug_reg_state); | |
465 | } | |
466 | ||
467 | static CORE_ADDR | |
468 | x86_stopped_data_address (void) | |
469 | { | |
470 | struct process_info *proc = current_process (); | |
471 | CORE_ADDR addr; | |
472 | if (i386_low_stopped_data_address (&proc->private->arch_private->debug_reg_state, | |
473 | &addr)) | |
474 | return addr; | |
475 | return 0; | |
476 | } | |
477 | \f | |
478 | /* Called when a new process is created. */ | |
479 | ||
480 | static struct arch_process_info * | |
481 | x86_linux_new_process (void) | |
482 | { | |
483 | struct arch_process_info *info = xcalloc (1, sizeof (*info)); | |
484 | ||
485 | i386_low_init_dregs (&info->debug_reg_state); | |
486 | ||
487 | return info; | |
488 | } | |
489 | ||
490 | /* Called when a new thread is detected. */ | |
491 | ||
492 | static struct arch_lwp_info * | |
493 | x86_linux_new_thread (void) | |
494 | { | |
495 | struct arch_lwp_info *info = xcalloc (1, sizeof (*info)); | |
496 | ||
497 | info->debug_registers_changed = 1; | |
498 | ||
499 | return info; | |
500 | } | |
501 | ||
502 | /* Called when resuming a thread. | |
503 | If the debug regs have changed, update the thread's copies. */ | |
504 | ||
505 | static void | |
506 | x86_linux_prepare_to_resume (struct lwp_info *lwp) | |
507 | { | |
508 | if (lwp->arch_private->debug_registers_changed) | |
509 | { | |
510 | int i; | |
511 | ptid_t ptid = ptid_of (lwp); | |
512 | int pid = ptid_get_pid (ptid); | |
513 | struct process_info *proc = find_process_pid (pid); | |
514 | struct i386_debug_reg_state *state = &proc->private->arch_private->debug_reg_state; | |
515 | ||
516 | for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++) | |
517 | x86_linux_dr_set (ptid, i, state->dr_mirror[i]); | |
518 | ||
519 | x86_linux_dr_set (ptid, DR_CONTROL, state->dr_control_mirror); | |
520 | ||
521 | lwp->arch_private->debug_registers_changed = 0; | |
522 | } | |
523 | } | |
524 | \f | |
d0722149 DE |
525 | /* When GDBSERVER is built as a 64-bit application on linux, the |
526 | PTRACE_GETSIGINFO data is always presented in 64-bit layout. Since | |
527 | debugging a 32-bit inferior with a 64-bit GDBSERVER should look the same | |
528 | as debugging it with a 32-bit GDBSERVER, we do the 32-bit <-> 64-bit | |
529 | conversion in-place ourselves. */ | |
530 | ||
531 | /* These types below (compat_*) define a siginfo type that is layout | |
532 | compatible with the siginfo type exported by the 32-bit userspace | |
533 | support. */ | |
534 | ||
535 | #ifdef __x86_64__ | |
536 | ||
537 | typedef int compat_int_t; | |
538 | typedef unsigned int compat_uptr_t; | |
539 | ||
540 | typedef int compat_time_t; | |
541 | typedef int compat_timer_t; | |
542 | typedef int compat_clock_t; | |
543 | ||
544 | struct compat_timeval | |
545 | { | |
546 | compat_time_t tv_sec; | |
547 | int tv_usec; | |
548 | }; | |
549 | ||
550 | typedef union compat_sigval | |
551 | { | |
552 | compat_int_t sival_int; | |
553 | compat_uptr_t sival_ptr; | |
554 | } compat_sigval_t; | |
555 | ||
556 | typedef struct compat_siginfo | |
557 | { | |
558 | int si_signo; | |
559 | int si_errno; | |
560 | int si_code; | |
561 | ||
562 | union | |
563 | { | |
564 | int _pad[((128 / sizeof (int)) - 3)]; | |
565 | ||
566 | /* kill() */ | |
567 | struct | |
568 | { | |
569 | unsigned int _pid; | |
570 | unsigned int _uid; | |
571 | } _kill; | |
572 | ||
573 | /* POSIX.1b timers */ | |
574 | struct | |
575 | { | |
576 | compat_timer_t _tid; | |
577 | int _overrun; | |
578 | compat_sigval_t _sigval; | |
579 | } _timer; | |
580 | ||
581 | /* POSIX.1b signals */ | |
582 | struct | |
583 | { | |
584 | unsigned int _pid; | |
585 | unsigned int _uid; | |
586 | compat_sigval_t _sigval; | |
587 | } _rt; | |
588 | ||
589 | /* SIGCHLD */ | |
590 | struct | |
591 | { | |
592 | unsigned int _pid; | |
593 | unsigned int _uid; | |
594 | int _status; | |
595 | compat_clock_t _utime; | |
596 | compat_clock_t _stime; | |
597 | } _sigchld; | |
598 | ||
599 | /* SIGILL, SIGFPE, SIGSEGV, SIGBUS */ | |
600 | struct | |
601 | { | |
602 | unsigned int _addr; | |
603 | } _sigfault; | |
604 | ||
605 | /* SIGPOLL */ | |
606 | struct | |
607 | { | |
608 | int _band; | |
609 | int _fd; | |
610 | } _sigpoll; | |
611 | } _sifields; | |
612 | } compat_siginfo_t; | |
613 | ||
614 | #define cpt_si_pid _sifields._kill._pid | |
615 | #define cpt_si_uid _sifields._kill._uid | |
616 | #define cpt_si_timerid _sifields._timer._tid | |
617 | #define cpt_si_overrun _sifields._timer._overrun | |
618 | #define cpt_si_status _sifields._sigchld._status | |
619 | #define cpt_si_utime _sifields._sigchld._utime | |
620 | #define cpt_si_stime _sifields._sigchld._stime | |
621 | #define cpt_si_ptr _sifields._rt._sigval.sival_ptr | |
622 | #define cpt_si_addr _sifields._sigfault._addr | |
623 | #define cpt_si_band _sifields._sigpoll._band | |
624 | #define cpt_si_fd _sifields._sigpoll._fd | |
625 | ||
626 | /* glibc at least up to 2.3.2 doesn't have si_timerid, si_overrun. | |
627 | In their place is si_timer1,si_timer2. */ | |
628 | #ifndef si_timerid | |
629 | #define si_timerid si_timer1 | |
630 | #endif | |
631 | #ifndef si_overrun | |
632 | #define si_overrun si_timer2 | |
633 | #endif | |
634 | ||
635 | static void | |
636 | compat_siginfo_from_siginfo (compat_siginfo_t *to, siginfo_t *from) | |
637 | { | |
638 | memset (to, 0, sizeof (*to)); | |
639 | ||
640 | to->si_signo = from->si_signo; | |
641 | to->si_errno = from->si_errno; | |
642 | to->si_code = from->si_code; | |
643 | ||
644 | if (to->si_code < 0) | |
645 | { | |
646 | to->cpt_si_ptr = (intptr_t) from->si_ptr; | |
647 | } | |
648 | else if (to->si_code == SI_USER) | |
649 | { | |
650 | to->cpt_si_pid = from->si_pid; | |
651 | to->cpt_si_uid = from->si_uid; | |
652 | } | |
653 | else if (to->si_code == SI_TIMER) | |
654 | { | |
655 | to->cpt_si_timerid = from->si_timerid; | |
656 | to->cpt_si_overrun = from->si_overrun; | |
657 | to->cpt_si_ptr = (intptr_t) from->si_ptr; | |
658 | } | |
659 | else | |
660 | { | |
661 | switch (to->si_signo) | |
662 | { | |
663 | case SIGCHLD: | |
664 | to->cpt_si_pid = from->si_pid; | |
665 | to->cpt_si_uid = from->si_uid; | |
666 | to->cpt_si_status = from->si_status; | |
667 | to->cpt_si_utime = from->si_utime; | |
668 | to->cpt_si_stime = from->si_stime; | |
669 | break; | |
670 | case SIGILL: | |
671 | case SIGFPE: | |
672 | case SIGSEGV: | |
673 | case SIGBUS: | |
674 | to->cpt_si_addr = (intptr_t) from->si_addr; | |
675 | break; | |
676 | case SIGPOLL: | |
677 | to->cpt_si_band = from->si_band; | |
678 | to->cpt_si_fd = from->si_fd; | |
679 | break; | |
680 | default: | |
681 | to->cpt_si_pid = from->si_pid; | |
682 | to->cpt_si_uid = from->si_uid; | |
683 | to->cpt_si_ptr = (intptr_t) from->si_ptr; | |
684 | break; | |
685 | } | |
686 | } | |
687 | } | |
688 | ||
689 | static void | |
690 | siginfo_from_compat_siginfo (siginfo_t *to, compat_siginfo_t *from) | |
691 | { | |
692 | memset (to, 0, sizeof (*to)); | |
693 | ||
694 | to->si_signo = from->si_signo; | |
695 | to->si_errno = from->si_errno; | |
696 | to->si_code = from->si_code; | |
697 | ||
698 | if (to->si_code < 0) | |
699 | { | |
700 | to->si_ptr = (void *) (intptr_t) from->cpt_si_ptr; | |
701 | } | |
702 | else if (to->si_code == SI_USER) | |
703 | { | |
704 | to->si_pid = from->cpt_si_pid; | |
705 | to->si_uid = from->cpt_si_uid; | |
706 | } | |
707 | else if (to->si_code == SI_TIMER) | |
708 | { | |
709 | to->si_timerid = from->cpt_si_timerid; | |
710 | to->si_overrun = from->cpt_si_overrun; | |
711 | to->si_ptr = (void *) (intptr_t) from->cpt_si_ptr; | |
712 | } | |
713 | else | |
714 | { | |
715 | switch (to->si_signo) | |
716 | { | |
717 | case SIGCHLD: | |
718 | to->si_pid = from->cpt_si_pid; | |
719 | to->si_uid = from->cpt_si_uid; | |
720 | to->si_status = from->cpt_si_status; | |
721 | to->si_utime = from->cpt_si_utime; | |
722 | to->si_stime = from->cpt_si_stime; | |
723 | break; | |
724 | case SIGILL: | |
725 | case SIGFPE: | |
726 | case SIGSEGV: | |
727 | case SIGBUS: | |
728 | to->si_addr = (void *) (intptr_t) from->cpt_si_addr; | |
729 | break; | |
730 | case SIGPOLL: | |
731 | to->si_band = from->cpt_si_band; | |
732 | to->si_fd = from->cpt_si_fd; | |
733 | break; | |
734 | default: | |
735 | to->si_pid = from->cpt_si_pid; | |
736 | to->si_uid = from->cpt_si_uid; | |
737 | to->si_ptr = (void* ) (intptr_t) from->cpt_si_ptr; | |
738 | break; | |
739 | } | |
740 | } | |
741 | } | |
742 | ||
743 | #endif /* __x86_64__ */ | |
744 | ||
745 | /* Convert a native/host siginfo object, into/from the siginfo in the | |
746 | layout of the inferiors' architecture. Returns true if any | |
747 | conversion was done; false otherwise. If DIRECTION is 1, then copy | |
748 | from INF to NATIVE. If DIRECTION is 0, copy from NATIVE to | |
749 | INF. */ | |
750 | ||
751 | static int | |
752 | x86_siginfo_fixup (struct siginfo *native, void *inf, int direction) | |
753 | { | |
754 | #ifdef __x86_64__ | |
755 | /* Is the inferior 32-bit? If so, then fixup the siginfo object. */ | |
756 | if (register_size (0) == 4) | |
757 | { | |
9f1036c1 DE |
758 | if (sizeof (struct siginfo) != sizeof (compat_siginfo_t)) |
759 | fatal ("unexpected difference in siginfo"); | |
d0722149 DE |
760 | |
761 | if (direction == 0) | |
762 | compat_siginfo_from_siginfo ((struct compat_siginfo *) inf, native); | |
763 | else | |
764 | siginfo_from_compat_siginfo (native, (struct compat_siginfo *) inf); | |
765 | ||
766 | return 1; | |
767 | } | |
768 | #endif | |
769 | ||
770 | return 0; | |
771 | } | |
772 | \f | |
9f1036c1 | 773 | /* Initialize gdbserver for the architecture of the inferior. */ |
d0722149 DE |
774 | |
775 | static void | |
776 | x86_arch_setup (void) | |
777 | { | |
778 | #ifdef __x86_64__ | |
779 | int pid = pid_of (get_thread_lwp (current_inferior)); | |
780 | char *file = linux_child_pid_to_exec_file (pid); | |
781 | int use_64bit = elf_64_file_p (file); | |
782 | ||
783 | free (file); | |
784 | ||
785 | if (use_64bit < 0) | |
786 | { | |
787 | /* This can only happen if /proc/<pid>/exe is unreadable, | |
788 | but "that can't happen" if we've gotten this far. | |
789 | Fall through and assume this is a 32-bit program. */ | |
790 | } | |
791 | else if (use_64bit) | |
792 | { | |
793 | init_registers_x86_64_linux (); | |
794 | ||
795 | /* Amd64 doesn't have HAVE_LINUX_USRREGS. */ | |
796 | the_low_target.num_regs = -1; | |
797 | the_low_target.regmap = NULL; | |
798 | the_low_target.cannot_fetch_register = NULL; | |
799 | the_low_target.cannot_store_register = NULL; | |
800 | ||
801 | /* Amd64 has 16 xmm regs. */ | |
802 | num_xmm_registers = 16; | |
803 | ||
804 | return; | |
805 | } | |
806 | #endif | |
807 | ||
808 | /* Ok we have a 32-bit inferior. */ | |
809 | ||
810 | init_registers_i386_linux (); | |
811 | ||
812 | the_low_target.num_regs = I386_NUM_REGS; | |
813 | the_low_target.regmap = i386_regmap; | |
814 | the_low_target.cannot_fetch_register = i386_cannot_fetch_register; | |
815 | the_low_target.cannot_store_register = i386_cannot_store_register; | |
816 | ||
817 | /* I386 has 8 xmm regs. */ | |
818 | num_xmm_registers = 8; | |
819 | } | |
820 | ||
821 | /* This is initialized assuming an amd64 target. | |
822 | x86_arch_setup will correct it for i386 or amd64 targets. */ | |
823 | ||
824 | struct linux_target_ops the_low_target = | |
825 | { | |
826 | x86_arch_setup, | |
827 | -1, | |
828 | NULL, | |
829 | NULL, | |
830 | NULL, | |
831 | x86_get_pc, | |
832 | x86_set_pc, | |
833 | x86_breakpoint, | |
834 | x86_breakpoint_len, | |
835 | NULL, | |
836 | 1, | |
837 | x86_breakpoint_at, | |
aa5ca48f DE |
838 | x86_insert_point, |
839 | x86_remove_point, | |
840 | x86_stopped_by_watchpoint, | |
841 | x86_stopped_data_address, | |
d0722149 DE |
842 | /* collect_ptrace_register/supply_ptrace_register are not needed in the |
843 | native i386 case (no registers smaller than an xfer unit), and are not | |
844 | used in the biarch case (HAVE_LINUX_USRREGS is not defined). */ | |
845 | NULL, | |
846 | NULL, | |
847 | /* need to fix up i386 siginfo if host is amd64 */ | |
848 | x86_siginfo_fixup, | |
aa5ca48f DE |
849 | x86_linux_new_process, |
850 | x86_linux_new_thread, | |
851 | x86_linux_prepare_to_resume | |
d0722149 | 852 | }; |