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* regcache.c (set_register_cache): Invalidate regcaches before
[deliverable/binutils-gdb.git] / gdb / gdbserver / linux-x86-low.c
CommitLineData
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"
1570b33e
L		 27#include "i386-xstate.h"
28#include "elf/common.h"
d0722149
DE		 29
30#include "gdb_proc_service.h"
31
90884b2b 32/* Defined in auto-generated file i386-linux.c. */
d0722149 33void init_registers_i386_linux (void);
90884b2b
L		 34/* Defined in auto-generated file amd64-linux.c. */
35void init_registers_amd64_linux (void);
1570b33e
L		 36/* Defined in auto-generated file i386-avx-linux.c. */
37void init_registers_i386_avx_linux (void);
38/* Defined in auto-generated file amd64-avx-linux.c. */
39void init_registers_amd64_avx_linux (void);
3a13a53b
L		 40/* Defined in auto-generated file i386-mmx-linux.c. */
41void init_registers_i386_mmx_linux (void);
1570b33e
L		 42
43/* Backward compatibility for gdb without XML support. */
44
45static const char *xmltarget_i386_linux_no_xml = "@<target>\
46<architecture>i386</architecture>\
47<osabi>GNU/Linux</osabi>\
48</target>";
49static const char *xmltarget_amd64_linux_no_xml = "@<target>\
50<architecture>i386:x86-64</architecture>\
51<osabi>GNU/Linux</osabi>\
52</target>";
d0722149
DE		 53
54#include <sys/reg.h>
55#include <sys/procfs.h>
56#include <sys/ptrace.h>
1570b33e
L		 57#include <sys/uio.h>
58
59#ifndef PTRACE_GETREGSET
60#define PTRACE_GETREGSET 0x4204
61#endif
62
63#ifndef PTRACE_SETREGSET
64#define PTRACE_SETREGSET 0x4205
65#endif
66
d0722149
DE		 67
68#ifndef PTRACE_GET_THREAD_AREA
69#define PTRACE_GET_THREAD_AREA 25
70#endif
71
72/* This definition comes from prctl.h, but some kernels may not have it. */
73#ifndef PTRACE_ARCH_PRCTL
74#define PTRACE_ARCH_PRCTL 30
75#endif
76
77/* The following definitions come from prctl.h, but may be absent
78 for certain configurations. */
79#ifndef ARCH_GET_FS
80#define ARCH_SET_GS 0x1001
81#define ARCH_SET_FS 0x1002
82#define ARCH_GET_FS 0x1003
83#define ARCH_GET_GS 0x1004
84#endif
85
aa5ca48f
DE		 86/* Per-process arch-specific data we want to keep. */
87
88struct arch_process_info
89{
90 struct i386_debug_reg_state debug_reg_state;
91};
92
93/* Per-thread arch-specific data we want to keep. */
94
95struct arch_lwp_info
96{
97 /* Non-zero if our copy differs from what's recorded in the thread. */
98 int debug_registers_changed;
99};
100
d0722149
DE		 101#ifdef __x86_64__
102
103/* Mapping between the general-purpose registers in `struct user'
104 format and GDB's register array layout.
105 Note that the transfer layout uses 64-bit regs. */
106static /*const*/ int i386_regmap[] =
107{
108 RAX * 8, RCX * 8, RDX * 8, RBX * 8,
109 RSP * 8, RBP * 8, RSI * 8, RDI * 8,
110 RIP * 8, EFLAGS * 8, CS * 8, SS * 8,
111 DS * 8, ES * 8, FS * 8, GS * 8
112};
113
114#define I386_NUM_REGS (sizeof (i386_regmap) / sizeof (i386_regmap[0]))
115
116/* So code below doesn't have to care, i386 or amd64. */
117#define ORIG_EAX ORIG_RAX
118
119static const int x86_64_regmap[] =
120{
121 RAX * 8, RBX * 8, RCX * 8, RDX * 8,
122 RSI * 8, RDI * 8, RBP * 8, RSP * 8,
123 R8 * 8, R9 * 8, R10 * 8, R11 * 8,
124 R12 * 8, R13 * 8, R14 * 8, R15 * 8,
125 RIP * 8, EFLAGS * 8, CS * 8, SS * 8,
126 DS * 8, ES * 8, FS * 8, GS * 8,
127 -1, -1, -1, -1, -1, -1, -1, -1,
128 -1, -1, -1, -1, -1, -1, -1, -1,
129 -1, -1, -1, -1, -1, -1, -1, -1,
130 -1, -1, -1, -1, -1, -1, -1, -1, -1,
131 ORIG_RAX * 8
132};
133
134#define X86_64_NUM_REGS (sizeof (x86_64_regmap) / sizeof (x86_64_regmap[0]))
135
136#else /* ! __x86_64__ */
137
138/* Mapping between the general-purpose registers in `struct user'
139 format and GDB's register array layout. */
140static /*const*/ int i386_regmap[] =
141{
142 EAX * 4, ECX * 4, EDX * 4, EBX * 4,
143 UESP * 4, EBP * 4, ESI * 4, EDI * 4,
144 EIP * 4, EFL * 4, CS * 4, SS * 4,
145 DS * 4, ES * 4, FS * 4, GS * 4
146};
147
148#define I386_NUM_REGS (sizeof (i386_regmap) / sizeof (i386_regmap[0]))
149
150#endif
151\f
152/* Called by libthread_db. */
153
154ps_err_e
155ps_get_thread_area (const struct ps_prochandle *ph,
156 lwpid_t lwpid, int idx, void **base)
157{
158#ifdef __x86_64__
159 int use_64bit = register_size (0) == 8;
160
161 if (use_64bit)
162 {
163 switch (idx)
164 {
165 case FS:
166 if (ptrace (PTRACE_ARCH_PRCTL, lwpid, base, ARCH_GET_FS) == 0)
167 return PS_OK;
168 break;
169 case GS:
170 if (ptrace (PTRACE_ARCH_PRCTL, lwpid, base, ARCH_GET_GS) == 0)
171 return PS_OK;
172 break;
173 default:
174 return PS_BADADDR;
175 }
176 return PS_ERR;
177 }
178#endif
179
180 {
181 unsigned int desc[4];
182
183 if (ptrace (PTRACE_GET_THREAD_AREA, lwpid,
184 (void *) (intptr_t) idx, (unsigned long) &desc) < 0)
185 return PS_ERR;
186
187 *(int *)base = desc[1];
188 return PS_OK;
189 }
190}
191\f
192static int
193i386_cannot_store_register (int regno)
194{
195 return regno >= I386_NUM_REGS;
196}
197
198static int
199i386_cannot_fetch_register (int regno)
200{
201 return regno >= I386_NUM_REGS;
202}
203
204static void
442ea881 205x86_fill_gregset (struct regcache *regcache, void *buf)
d0722149
DE		 206{
207 int i;
208
209#ifdef __x86_64__
210 if (register_size (0) == 8)
211 {
212 for (i = 0; i < X86_64_NUM_REGS; i++)
213 if (x86_64_regmap[i] != -1)
442ea881 214 collect_register (regcache, i, ((char *) buf) + x86_64_regmap[i]);
d0722149
DE		 215 return;
216 }
217#endif
218
219 for (i = 0; i < I386_NUM_REGS; i++)
442ea881 220 collect_register (regcache, i, ((char *) buf) + i386_regmap[i]);
d0722149 221
442ea881
PA		 222 collect_register_by_name (regcache, "orig_eax",
223 ((char *) buf) + ORIG_EAX * 4);
d0722149
DE		 224}
225
226static void
442ea881 227x86_store_gregset (struct regcache *regcache, const void *buf)
d0722149
DE		 228{
229 int i;
230
231#ifdef __x86_64__
232 if (register_size (0) == 8)
233 {
234 for (i = 0; i < X86_64_NUM_REGS; i++)
235 if (x86_64_regmap[i] != -1)
442ea881 236 supply_register (regcache, i, ((char *) buf) + x86_64_regmap[i]);
d0722149
DE		 237 return;
238 }
239#endif
240
241 for (i = 0; i < I386_NUM_REGS; i++)
442ea881 242 supply_register (regcache, i, ((char *) buf) + i386_regmap[i]);
d0722149 243
442ea881
PA		 244 supply_register_by_name (regcache, "orig_eax",
245 ((char *) buf) + ORIG_EAX * 4);
d0722149
DE		 246}
247
248static void
442ea881 249x86_fill_fpregset (struct regcache *regcache, void *buf)
d0722149
DE		 250{
251#ifdef __x86_64__
442ea881 252 i387_cache_to_fxsave (regcache, buf);
d0722149 253#else
442ea881 254 i387_cache_to_fsave (regcache, buf);
d0722149
DE		 255#endif
256}
257
258static void
442ea881 259x86_store_fpregset (struct regcache *regcache, const void *buf)
d0722149
DE		 260{
261#ifdef __x86_64__
442ea881 262 i387_fxsave_to_cache (regcache, buf);
d0722149 263#else
442ea881 264 i387_fsave_to_cache (regcache, buf);
d0722149
DE		 265#endif
266}
267
268#ifndef __x86_64__
269
270static void
442ea881 271x86_fill_fpxregset (struct regcache *regcache, void *buf)
d0722149 272{
442ea881 273 i387_cache_to_fxsave (regcache, buf);
d0722149
DE		 274}
275
276static void
442ea881 277x86_store_fpxregset (struct regcache *regcache, const void *buf)
d0722149 278{
442ea881 279 i387_fxsave_to_cache (regcache, buf);
d0722149
DE		 280}
281
282#endif
283
1570b33e
L		 284static void
285x86_fill_xstateregset (struct regcache *regcache, void *buf)
286{
287 i387_cache_to_xsave (regcache, buf);
288}
289
290static void
291x86_store_xstateregset (struct regcache *regcache, const void *buf)
292{
293 i387_xsave_to_cache (regcache, buf);
294}
295
d0722149
DE		 296/* ??? The non-biarch i386 case stores all the i387 regs twice.
297 Once in i387_.*fsave.* and once in i387_.*fxsave.*.
298 This is, presumably, to handle the case where PTRACE_[GS]ETFPXREGS
299 doesn't work. IWBN to avoid the duplication in the case where it
300 does work. Maybe the arch_setup routine could check whether it works
301 and update target_regsets accordingly, maybe by moving target_regsets
302 to linux_target_ops and set the right one there, rather than having to
303 modify the target_regsets global. */
304
305struct regset_info target_regsets[] =
306{
307#ifdef HAVE_PTRACE_GETREGS
1570b33e 308 { PTRACE_GETREGS, PTRACE_SETREGS, 0, sizeof (elf_gregset_t),
d0722149
DE		 309 GENERAL_REGS,
310 x86_fill_gregset, x86_store_gregset },
1570b33e
L		 311 { PTRACE_GETREGSET, PTRACE_SETREGSET, NT_X86_XSTATE, 0,
312 EXTENDED_REGS, x86_fill_xstateregset, x86_store_xstateregset },
d0722149
DE		 313# ifndef __x86_64__
314# ifdef HAVE_PTRACE_GETFPXREGS
1570b33e 315 { PTRACE_GETFPXREGS, PTRACE_SETFPXREGS, 0, sizeof (elf_fpxregset_t),
d0722149
DE		 316 EXTENDED_REGS,
317 x86_fill_fpxregset, x86_store_fpxregset },
318# endif
319# endif
1570b33e 320 { PTRACE_GETFPREGS, PTRACE_SETFPREGS, 0, sizeof (elf_fpregset_t),
d0722149
DE		 321 FP_REGS,
322 x86_fill_fpregset, x86_store_fpregset },
323#endif /* HAVE_PTRACE_GETREGS */
1570b33e 324 { 0, 0, 0, -1, -1, NULL, NULL }
d0722149
DE		 325};
326
327static CORE_ADDR
442ea881 328x86_get_pc (struct regcache *regcache)
d0722149
DE		 329{
330 int use_64bit = register_size (0) == 8;
331
332 if (use_64bit)
333 {
334 unsigned long pc;
442ea881 335 collect_register_by_name (regcache, "rip", &pc);
d0722149
DE		 336 return (CORE_ADDR) pc;
337 }
338 else
339 {
340 unsigned int pc;
442ea881 341 collect_register_by_name (regcache, "eip", &pc);
d0722149
DE		 342 return (CORE_ADDR) pc;
343 }
344}
345
346static void
442ea881 347x86_set_pc (struct regcache *regcache, CORE_ADDR pc)
d0722149
DE		 348{
349 int use_64bit = register_size (0) == 8;
350
351 if (use_64bit)
352 {
353 unsigned long newpc = pc;
442ea881 354 supply_register_by_name (regcache, "rip", &newpc);
d0722149
DE		 355 }
356 else
357 {
358 unsigned int newpc = pc;
442ea881 359 supply_register_by_name (regcache, "eip", &newpc);
d0722149
DE		 360 }
361}
362\f
363static const unsigned char x86_breakpoint[] = { 0xCC };
364#define x86_breakpoint_len 1
365
366static int
367x86_breakpoint_at (CORE_ADDR pc)
368{
369 unsigned char c;
370
fc7238bb 371 (*the_target->read_memory) (pc, &c, 1);
d0722149
DE		 372 if (c == 0xCC)
373 return 1;
374
375 return 0;
376}
377\f
aa5ca48f
DE		 378/* Support for debug registers. */
379
380static unsigned long
381x86_linux_dr_get (ptid_t ptid, int regnum)
382{
383 int tid;
384 unsigned long value;
385
386 tid = ptid_get_lwp (ptid);
387
388 errno = 0;
389 value = ptrace (PTRACE_PEEKUSER, tid,
390 offsetof (struct user, u_debugreg[regnum]), 0);
391 if (errno != 0)
392 error ("Couldn't read debug register");
393
394 return value;
395}
396
397static void
398x86_linux_dr_set (ptid_t ptid, int regnum, unsigned long value)
399{
400 int tid;
401
402 tid = ptid_get_lwp (ptid);
403
404 errno = 0;
405 ptrace (PTRACE_POKEUSER, tid,
406 offsetof (struct user, u_debugreg[regnum]), value);
407 if (errno != 0)
408 error ("Couldn't write debug register");
409}
410
411/* Update the inferior's debug register REGNUM from STATE. */
412
413void
414i386_dr_low_set_addr (const struct i386_debug_reg_state *state, int regnum)
415{
416 struct inferior_list_entry *lp;
417 CORE_ADDR addr;
418 /* Only need to update the threads of this process. */
419 int pid = pid_of (get_thread_lwp (current_inferior));
420
421 if (! (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR))
422 fatal ("Invalid debug register %d", regnum);
423
424 addr = state->dr_mirror[regnum];
425
426 for (lp = all_lwps.head; lp; lp = lp->next)
427 {
428 struct lwp_info *lwp = (struct lwp_info *) lp;
429
430 /* The actual update is done later, we just mark that the register
431 needs updating. */
432 if (pid_of (lwp) == pid)
433 lwp->arch_private->debug_registers_changed = 1;
434 }
435}
436
437/* Update the inferior's DR7 debug control register from STATE. */
438
439void
440i386_dr_low_set_control (const struct i386_debug_reg_state *state)
441{
442 struct inferior_list_entry *lp;
443 /* Only need to update the threads of this process. */
444 int pid = pid_of (get_thread_lwp (current_inferior));
445
446 for (lp = all_lwps.head; lp; lp = lp->next)
447 {
448 struct lwp_info *lwp = (struct lwp_info *) lp;
449
450 /* The actual update is done later, we just mark that the register
451 needs updating. */
452 if (pid_of (lwp) == pid)
453 lwp->arch_private->debug_registers_changed = 1;
454 }
455}
456
457/* Get the value of the DR6 debug status register from the inferior
458 and record it in STATE. */
459
460void
461i386_dr_low_get_status (struct i386_debug_reg_state *state)
462{
463 struct lwp_info *lwp = get_thread_lwp (current_inferior);
464 ptid_t ptid = ptid_of (lwp);
465
466 state->dr_status_mirror = x86_linux_dr_get (ptid, DR_STATUS);
467}
468\f
469/* Watchpoint support. */
470
471static int
472x86_insert_point (char type, CORE_ADDR addr, int len)
473{
474 struct process_info *proc = current_process ();
475 switch (type)
476 {
8b07ae33
PA		 477 case '0':
478 return set_gdb_breakpoint_at (addr);
aa5ca48f
DE		 479 case '2':
480 case '3':
481 case '4':
482 return i386_low_insert_watchpoint (&proc->private->arch_private->debug_reg_state,
483 type, addr, len);
484 default:
485 /* Unsupported. */
486 return 1;
487 }
488}
489
490static int
491x86_remove_point (char type, CORE_ADDR addr, int len)
492{
493 struct process_info *proc = current_process ();
494 switch (type)
495 {
8b07ae33
PA		 496 case '0':
497 return delete_gdb_breakpoint_at (addr);
aa5ca48f
DE		 498 case '2':
499 case '3':
500 case '4':
501 return i386_low_remove_watchpoint (&proc->private->arch_private->debug_reg_state,
502 type, addr, len);
503 default:
504 /* Unsupported. */
505 return 1;
506 }
507}
508
509static int
510x86_stopped_by_watchpoint (void)
511{
512 struct process_info *proc = current_process ();
513 return i386_low_stopped_by_watchpoint (&proc->private->arch_private->debug_reg_state);
514}
515
516static CORE_ADDR
517x86_stopped_data_address (void)
518{
519 struct process_info *proc = current_process ();
520 CORE_ADDR addr;
521 if (i386_low_stopped_data_address (&proc->private->arch_private->debug_reg_state,
522 &addr))
523 return addr;
524 return 0;
525}
526\f
527/* Called when a new process is created. */
528
529static struct arch_process_info *
530x86_linux_new_process (void)
531{
532 struct arch_process_info *info = xcalloc (1, sizeof (*info));
533
534 i386_low_init_dregs (&info->debug_reg_state);
535
536 return info;
537}
538
539/* Called when a new thread is detected. */
540
541static struct arch_lwp_info *
542x86_linux_new_thread (void)
543{
544 struct arch_lwp_info *info = xcalloc (1, sizeof (*info));
545
546 info->debug_registers_changed = 1;
547
548 return info;
549}
550
551/* Called when resuming a thread.
552 If the debug regs have changed, update the thread's copies. */
553
554static void
555x86_linux_prepare_to_resume (struct lwp_info *lwp)
556{
b9a881c2
PA		 557 ptid_t ptid = ptid_of (lwp);
558
aa5ca48f
DE		 559 if (lwp->arch_private->debug_registers_changed)
560 {
561 int i;
aa5ca48f
DE		 562 int pid = ptid_get_pid (ptid);
563 struct process_info *proc = find_process_pid (pid);
564 struct i386_debug_reg_state *state = &proc->private->arch_private->debug_reg_state;
565
566 for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++)
567 x86_linux_dr_set (ptid, i, state->dr_mirror[i]);
568
569 x86_linux_dr_set (ptid, DR_CONTROL, state->dr_control_mirror);
570
571 lwp->arch_private->debug_registers_changed = 0;
572 }
b9a881c2
PA		 573
574 if (lwp->stopped_by_watchpoint)
575 x86_linux_dr_set (ptid, DR_STATUS, 0);
aa5ca48f
DE		 576}
577\f
d0722149
DE		 578/* When GDBSERVER is built as a 64-bit application on linux, the
579 PTRACE_GETSIGINFO data is always presented in 64-bit layout. Since
580 debugging a 32-bit inferior with a 64-bit GDBSERVER should look the same
581 as debugging it with a 32-bit GDBSERVER, we do the 32-bit <-> 64-bit
582 conversion in-place ourselves. */
583
584/* These types below (compat_*) define a siginfo type that is layout
585 compatible with the siginfo type exported by the 32-bit userspace
586 support. */
587
588#ifdef __x86_64__
589
590typedef int compat_int_t;
591typedef unsigned int compat_uptr_t;
592
593typedef int compat_time_t;
594typedef int compat_timer_t;
595typedef int compat_clock_t;
596
597struct compat_timeval
598{
599 compat_time_t tv_sec;
600 int tv_usec;
601};
602
603typedef union compat_sigval
604{
605 compat_int_t sival_int;
606 compat_uptr_t sival_ptr;
607} compat_sigval_t;
608
609typedef struct compat_siginfo
610{
611 int si_signo;
612 int si_errno;
613 int si_code;
614
615 union
616 {
617 int _pad[((128 / sizeof (int)) - 3)];
618
619 /* kill() */
620 struct
621 {
622 unsigned int _pid;
623 unsigned int _uid;
624 } _kill;
625
626 /* POSIX.1b timers */
627 struct
628 {
629 compat_timer_t _tid;
630 int _overrun;
631 compat_sigval_t _sigval;
632 } _timer;
633
634 /* POSIX.1b signals */
635 struct
636 {
637 unsigned int _pid;
638 unsigned int _uid;
639 compat_sigval_t _sigval;
640 } _rt;
641
642 /* SIGCHLD */
643 struct
644 {
645 unsigned int _pid;
646 unsigned int _uid;
647 int _status;
648 compat_clock_t _utime;
649 compat_clock_t _stime;
650 } _sigchld;
651
652 /* SIGILL, SIGFPE, SIGSEGV, SIGBUS */
653 struct
654 {
655 unsigned int _addr;
656 } _sigfault;
657
658 /* SIGPOLL */
659 struct
660 {
661 int _band;
662 int _fd;
663 } _sigpoll;
664 } _sifields;
665} compat_siginfo_t;
666
667#define cpt_si_pid _sifields._kill._pid
668#define cpt_si_uid _sifields._kill._uid
669#define cpt_si_timerid _sifields._timer._tid
670#define cpt_si_overrun _sifields._timer._overrun
671#define cpt_si_status _sifields._sigchld._status
672#define cpt_si_utime _sifields._sigchld._utime
673#define cpt_si_stime _sifields._sigchld._stime
674#define cpt_si_ptr _sifields._rt._sigval.sival_ptr
675#define cpt_si_addr _sifields._sigfault._addr
676#define cpt_si_band _sifields._sigpoll._band
677#define cpt_si_fd _sifields._sigpoll._fd
678
679/* glibc at least up to 2.3.2 doesn't have si_timerid, si_overrun.
680 In their place is si_timer1,si_timer2. */
681#ifndef si_timerid
682#define si_timerid si_timer1
683#endif
684#ifndef si_overrun
685#define si_overrun si_timer2
686#endif
687
688static void
689compat_siginfo_from_siginfo (compat_siginfo_t *to, siginfo_t *from)
690{
691 memset (to, 0, sizeof (*to));
692
693 to->si_signo = from->si_signo;
694 to->si_errno = from->si_errno;
695 to->si_code = from->si_code;
696
697 if (to->si_code < 0)
698 {
699 to->cpt_si_ptr = (intptr_t) from->si_ptr;
700 }
701 else if (to->si_code == SI_USER)
702 {
703 to->cpt_si_pid = from->si_pid;
704 to->cpt_si_uid = from->si_uid;
705 }
706 else if (to->si_code == SI_TIMER)
707 {
708 to->cpt_si_timerid = from->si_timerid;
709 to->cpt_si_overrun = from->si_overrun;
710 to->cpt_si_ptr = (intptr_t) from->si_ptr;
711 }
712 else
713 {
714 switch (to->si_signo)
715 {
716 case SIGCHLD:
717 to->cpt_si_pid = from->si_pid;
718 to->cpt_si_uid = from->si_uid;
719 to->cpt_si_status = from->si_status;
720 to->cpt_si_utime = from->si_utime;
721 to->cpt_si_stime = from->si_stime;
722 break;
723 case SIGILL:
724 case SIGFPE:
725 case SIGSEGV:
726 case SIGBUS:
727 to->cpt_si_addr = (intptr_t) from->si_addr;
728 break;
729 case SIGPOLL:
730 to->cpt_si_band = from->si_band;
731 to->cpt_si_fd = from->si_fd;
732 break;
733 default:
734 to->cpt_si_pid = from->si_pid;
735 to->cpt_si_uid = from->si_uid;
736 to->cpt_si_ptr = (intptr_t) from->si_ptr;
737 break;
738 }
739 }
740}
741
742static void
743siginfo_from_compat_siginfo (siginfo_t *to, compat_siginfo_t *from)
744{
745 memset (to, 0, sizeof (*to));
746
747 to->si_signo = from->si_signo;
748 to->si_errno = from->si_errno;
749 to->si_code = from->si_code;
750
751 if (to->si_code < 0)
752 {
753 to->si_ptr = (void *) (intptr_t) from->cpt_si_ptr;
754 }
755 else if (to->si_code == SI_USER)
756 {
757 to->si_pid = from->cpt_si_pid;
758 to->si_uid = from->cpt_si_uid;
759 }
760 else if (to->si_code == SI_TIMER)
761 {
762 to->si_timerid = from->cpt_si_timerid;
763 to->si_overrun = from->cpt_si_overrun;
764 to->si_ptr = (void *) (intptr_t) from->cpt_si_ptr;
765 }
766 else
767 {
768 switch (to->si_signo)
769 {
770 case SIGCHLD:
771 to->si_pid = from->cpt_si_pid;
772 to->si_uid = from->cpt_si_uid;
773 to->si_status = from->cpt_si_status;
774 to->si_utime = from->cpt_si_utime;
775 to->si_stime = from->cpt_si_stime;
776 break;
777 case SIGILL:
778 case SIGFPE:
779 case SIGSEGV:
780 case SIGBUS:
781 to->si_addr = (void *) (intptr_t) from->cpt_si_addr;
782 break;
783 case SIGPOLL:
784 to->si_band = from->cpt_si_band;
785 to->si_fd = from->cpt_si_fd;
786 break;
787 default:
788 to->si_pid = from->cpt_si_pid;
789 to->si_uid = from->cpt_si_uid;
790 to->si_ptr = (void* ) (intptr_t) from->cpt_si_ptr;
791 break;
792 }
793 }
794}
795
796#endif /* __x86_64__ */
797
798/* Convert a native/host siginfo object, into/from the siginfo in the
799 layout of the inferiors' architecture. Returns true if any
800 conversion was done; false otherwise. If DIRECTION is 1, then copy
801 from INF to NATIVE. If DIRECTION is 0, copy from NATIVE to
802 INF. */
803
804static int
805x86_siginfo_fixup (struct siginfo *native, void *inf, int direction)
806{
807#ifdef __x86_64__
808 /* Is the inferior 32-bit? If so, then fixup the siginfo object. */
809 if (register_size (0) == 4)
810 {
9f1036c1
DE		 811 if (sizeof (struct siginfo) != sizeof (compat_siginfo_t))
812 fatal ("unexpected difference in siginfo");
d0722149
DE		 813
814 if (direction == 0)
815 compat_siginfo_from_siginfo ((struct compat_siginfo *) inf, native);
816 else
817 siginfo_from_compat_siginfo (native, (struct compat_siginfo *) inf);
818
819 return 1;
820 }
821#endif
822
823 return 0;
824}
825\f
1570b33e
L		 826static int use_xml;
827
828/* Update gdbserver_xmltarget. */
829
830static void
831x86_linux_update_xmltarget (void)
832{
3a13a53b
L		 833 int pid;
834 struct regset_info *regset;
1570b33e
L		 835 static unsigned long long xcr0;
836 static int have_ptrace_getregset = -1;
59e04013 837#if !defined(__x86_64__) && defined(HAVE_PTRACE_GETFPXREGS)
3a13a53b
L		 838 static int have_ptrace_getfpxregs = -1;
839#endif
1570b33e
L		 840
841 if (!current_inferior)
842 return;
843
45ba0d02
PA		 844 /* Before changing the register cache internal layout or the target
845 regsets, flush the contents of the current valid caches back to
846 the threads. */
847 regcache_invalidate ();
848
3a13a53b 849 pid = pid_of (get_thread_lwp (current_inferior));
1570b33e
L		 850#ifdef __x86_64__
851 if (num_xmm_registers == 8)
852 init_registers_i386_linux ();
853 else
854 init_registers_amd64_linux ();
855#else
3a13a53b
L		 856 {
857# ifdef HAVE_PTRACE_GETFPXREGS
858 if (have_ptrace_getfpxregs == -1)
859 {
860 elf_fpxregset_t fpxregs;
861
862 if (ptrace (PTRACE_GETFPXREGS, pid, 0, (int) &fpxregs) < 0)
863 {
864 have_ptrace_getfpxregs = 0;
865 x86_xcr0 = I386_XSTATE_X87_MASK;
866
867 /* Disable PTRACE_GETFPXREGS. */
868 for (regset = target_regsets;
869 regset->fill_function != NULL; regset++)
870 if (regset->get_request == PTRACE_GETFPXREGS)
871 {
872 regset->size = 0;
873 break;
874 }
875 }
876 else
877 have_ptrace_getfpxregs = 1;
878 }
879
880 if (!have_ptrace_getfpxregs)
881 {
882 init_registers_i386_mmx_linux ();
883 return;
884 }
885# endif
886 init_registers_i386_linux ();
887 }
1570b33e
L		 888#endif
889
890 if (!use_xml)
891 {
892 /* Don't use XML. */
893#ifdef __x86_64__
894 if (num_xmm_registers == 8)
895 gdbserver_xmltarget = xmltarget_i386_linux_no_xml;
896 else
897 gdbserver_xmltarget = xmltarget_amd64_linux_no_xml;
898#else
899 gdbserver_xmltarget = xmltarget_i386_linux_no_xml;
900#endif
901
902 x86_xcr0 = I386_XSTATE_SSE_MASK;
903
904 return;
905 }
906
907 /* Check if XSAVE extended state is supported. */
908 if (have_ptrace_getregset == -1)
909 {
1570b33e
L		 910 unsigned long long xstateregs[I386_XSTATE_SSE_SIZE / sizeof (long long)];
911 struct iovec iov;
1570b33e
L		 912
913 iov.iov_base = xstateregs;
914 iov.iov_len = sizeof (xstateregs);
915
916 /* Check if PTRACE_GETREGSET works. */
917 if (ptrace (PTRACE_GETREGSET, pid, (unsigned int) NT_X86_XSTATE,
918 &iov) < 0)
919 {
920 have_ptrace_getregset = 0;
921 return;
922 }
923 else
924 have_ptrace_getregset = 1;
925
926 /* Get XCR0 from XSAVE extended state at byte 464. */
927 xcr0 = xstateregs[464 / sizeof (long long)];
928
929 /* Use PTRACE_GETREGSET if it is available. */
930 for (regset = target_regsets;
931 regset->fill_function != NULL; regset++)
932 if (regset->get_request == PTRACE_GETREGSET)
933 regset->size = I386_XSTATE_SIZE (xcr0);
934 else if (regset->type != GENERAL_REGS)
935 regset->size = 0;
936 }
937
938 if (have_ptrace_getregset)
939 {
940 /* AVX is the highest feature we support. */
941 if ((xcr0 & I386_XSTATE_AVX_MASK) == I386_XSTATE_AVX_MASK)
942 {
943 x86_xcr0 = xcr0;
944
945#ifdef __x86_64__
946 /* I386 has 8 xmm regs. */
947 if (num_xmm_registers == 8)
948 init_registers_i386_avx_linux ();
949 else
950 init_registers_amd64_avx_linux ();
951#else
952 init_registers_i386_avx_linux ();
953#endif
954 }
955 }
956}
957
958/* Process qSupported query, "xmlRegisters=". Update the buffer size for
959 PTRACE_GETREGSET. */
960
961static void
962x86_linux_process_qsupported (const char *query)
963{
964 /* Return if gdb doesn't support XML. If gdb sends "xmlRegisters="
965 with "i386" in qSupported query, it supports x86 XML target
966 descriptions. */
967 use_xml = 0;
968 if (query != NULL && strncmp (query, "xmlRegisters=", 13) == 0)
969 {
970 char *copy = xstrdup (query + 13);
971 char *p;
972
973 for (p = strtok (copy, ","); p != NULL; p = strtok (NULL, ","))
974 {
975 if (strcmp (p, "i386") == 0)
976 {
977 use_xml = 1;
978 break;
979 }
980 }
981
982 free (copy);
983 }
984
985 x86_linux_update_xmltarget ();
986}
987
9f1036c1 988/* Initialize gdbserver for the architecture of the inferior. */
d0722149
DE		 989
990static void
991x86_arch_setup (void)
992{
993#ifdef __x86_64__
994 int pid = pid_of (get_thread_lwp (current_inferior));
995 char *file = linux_child_pid_to_exec_file (pid);
996 int use_64bit = elf_64_file_p (file);
997
998 free (file);
999
1000 if (use_64bit < 0)
1001 {
1002 /* This can only happen if /proc/<pid>/exe is unreadable,
1003 but "that can't happen" if we've gotten this far.
1004 Fall through and assume this is a 32-bit program. */
1005 }
1006 else if (use_64bit)
1007 {
d0722149
DE		 1008 /* Amd64 doesn't have HAVE_LINUX_USRREGS. */
1009 the_low_target.num_regs = -1;
1010 the_low_target.regmap = NULL;
1011 the_low_target.cannot_fetch_register = NULL;
1012 the_low_target.cannot_store_register = NULL;
1013
1014 /* Amd64 has 16 xmm regs. */
1015 num_xmm_registers = 16;
1016
1570b33e 1017 x86_linux_update_xmltarget ();
d0722149
DE		 1018 return;
1019 }
1020#endif
1021
1022 /* Ok we have a 32-bit inferior. */
1023
d0722149
DE		 1024 the_low_target.num_regs = I386_NUM_REGS;
1025 the_low_target.regmap = i386_regmap;
1026 the_low_target.cannot_fetch_register = i386_cannot_fetch_register;
1027 the_low_target.cannot_store_register = i386_cannot_store_register;
1028
1029 /* I386 has 8 xmm regs. */
1030 num_xmm_registers = 8;
1570b33e
L		 1031
1032 x86_linux_update_xmltarget ();
d0722149
DE		 1033}
1034
219f2f23
PA		 1035static int
1036x86_supports_tracepoints (void)
1037{
1038 return 1;
1039}
1040
d0722149
DE		 1041/* This is initialized assuming an amd64 target.
1042 x86_arch_setup will correct it for i386 or amd64 targets. */
1043
1044struct linux_target_ops the_low_target =
1045{
1046 x86_arch_setup,
1047 -1,
1048 NULL,
1049 NULL,
1050 NULL,
1051 x86_get_pc,
1052 x86_set_pc,
1053 x86_breakpoint,
1054 x86_breakpoint_len,
1055 NULL,
1056 1,
1057 x86_breakpoint_at,
aa5ca48f
DE		 1058 x86_insert_point,
1059 x86_remove_point,
1060 x86_stopped_by_watchpoint,
1061 x86_stopped_data_address,
d0722149
DE		 1062 /* collect_ptrace_register/supply_ptrace_register are not needed in the
1063 native i386 case (no registers smaller than an xfer unit), and are not
1064 used in the biarch case (HAVE_LINUX_USRREGS is not defined). */
1065 NULL,
1066 NULL,
1067 /* need to fix up i386 siginfo if host is amd64 */
1068 x86_siginfo_fixup,
aa5ca48f
DE		 1069 x86_linux_new_process,
1070 x86_linux_new_thread,
1570b33e 1071 x86_linux_prepare_to_resume,
219f2f23
PA		 1072 x86_linux_process_qsupported,
1073 x86_supports_tracepoints
d0722149 1074};
GDB Binutils - Deliverables
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