37fe60f24a5990f2f049d50dda54bb1c5731a936
[deliverable/binutils-gdb.git] / gdb / gdbserver / linux-x86-low.c
1 /* GNU/Linux/x86-64 specific low level interface, for the remote server
2 for GDB.
3 Copyright (C) 2002, 2004, 2005, 2006, 2007, 2008, 2009, 2010
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
21 #include <stddef.h>
22 #include <signal.h>
23 #include "server.h"
24 #include "linux-low.h"
25 #include "i387-fp.h"
26 #include "i386-low.h"
27
28 #include "gdb_proc_service.h"
29
30 /* Defined in auto-generated file i386-linux.c. */
31 void init_registers_i386_linux (void);
32 /* Defined in auto-generated file amd64-linux.c. */
33 void init_registers_amd64_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
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
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 (struct regcache *regcache, 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 (regcache, 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 (regcache, i, ((char *) buf) + i386_regmap[i]);
192
193 collect_register_by_name (regcache, "orig_eax",
194 ((char *) buf) + ORIG_EAX * 4);
195 }
196
197 static void
198 x86_store_gregset (struct regcache *regcache, const void *buf)
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)
207 supply_register (regcache, i, ((char *) buf) + x86_64_regmap[i]);
208 return;
209 }
210 #endif
211
212 for (i = 0; i < I386_NUM_REGS; i++)
213 supply_register (regcache, i, ((char *) buf) + i386_regmap[i]);
214
215 supply_register_by_name (regcache, "orig_eax",
216 ((char *) buf) + ORIG_EAX * 4);
217 }
218
219 static void
220 x86_fill_fpregset (struct regcache *regcache, void *buf)
221 {
222 #ifdef __x86_64__
223 i387_cache_to_fxsave (regcache, buf);
224 #else
225 i387_cache_to_fsave (regcache, buf);
226 #endif
227 }
228
229 static void
230 x86_store_fpregset (struct regcache *regcache, const void *buf)
231 {
232 #ifdef __x86_64__
233 i387_fxsave_to_cache (regcache, buf);
234 #else
235 i387_fsave_to_cache (regcache, buf);
236 #endif
237 }
238
239 #ifndef __x86_64__
240
241 static void
242 x86_fill_fpxregset (struct regcache *regcache, void *buf)
243 {
244 i387_cache_to_fxsave (regcache, buf);
245 }
246
247 static void
248 x86_store_fpxregset (struct regcache *regcache, const void *buf)
249 {
250 i387_fxsave_to_cache (regcache, buf);
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
285 x86_get_pc (struct regcache *regcache)
286 {
287 int use_64bit = register_size (0) == 8;
288
289 if (use_64bit)
290 {
291 unsigned long pc;
292 collect_register_by_name (regcache, "rip", &pc);
293 return (CORE_ADDR) pc;
294 }
295 else
296 {
297 unsigned int pc;
298 collect_register_by_name (regcache, "eip", &pc);
299 return (CORE_ADDR) pc;
300 }
301 }
302
303 static void
304 x86_set_pc (struct regcache *regcache, CORE_ADDR pc)
305 {
306 int use_64bit = register_size (0) == 8;
307
308 if (use_64bit)
309 {
310 unsigned long newpc = pc;
311 supply_register_by_name (regcache, "rip", &newpc);
312 }
313 else
314 {
315 unsigned int newpc = pc;
316 supply_register_by_name (regcache, "eip", &newpc);
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
328 (*the_target->read_memory) (pc, &c, 1);
329 if (c == 0xCC)
330 return 1;
331
332 return 0;
333 }
334 \f
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 {
434 case '0':
435 return set_gdb_breakpoint_at (addr);
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 {
453 case '0':
454 return delete_gdb_breakpoint_at (addr);
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 {
514 ptid_t ptid = ptid_of (lwp);
515
516 if (lwp->arch_private->debug_registers_changed)
517 {
518 int i;
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 }
530
531 if (lwp->stopped_by_watchpoint)
532 x86_linux_dr_set (ptid, DR_STATUS, 0);
533 }
534 \f
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 {
768 if (sizeof (struct siginfo) != sizeof (compat_siginfo_t))
769 fatal ("unexpected difference in siginfo");
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
783 /* Initialize gdbserver for the architecture of the inferior. */
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 {
803 init_registers_amd64_linux ();
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,
848 x86_insert_point,
849 x86_remove_point,
850 x86_stopped_by_watchpoint,
851 x86_stopped_data_address,
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,
859 x86_linux_new_process,
860 x86_linux_new_thread,
861 x86_linux_prepare_to_resume
862 };
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