1 /* Native-dependent code for GNU/Linux x86-64.
3 Copyright (C) 2001-2014 Free Software Foundation, Inc.
4 Contributed by Jiri Smid, SuSE Labs.
6 This file is part of GDB.
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.
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.
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/>. */
26 #include "linux-nat.h"
27 #include "amd64-linux-tdep.h"
28 #include "nat/linux-btrace.h"
31 #include "gdb_assert.h"
33 #include "elf/common.h"
35 #include <sys/ptrace.h>
36 #include <sys/debugreg.h>
37 #include <sys/syscall.h>
38 #include <sys/procfs.h>
40 #include <asm/prctl.h>
41 /* FIXME ezannoni-2003-07-09: we need <sys/reg.h> to be included after
42 <asm/ptrace.h> because the latter redefines FS and GS for no apparent
43 reason, and those definitions don't match the ones that libpthread_db
44 uses, which come from <sys/reg.h>. */
45 /* ezannoni-2003-07-09: I think this is fixed. The extraneous defs have
46 been removed from ptrace.h in the kernel. However, better safe than
48 #include <asm/ptrace.h>
50 #include "gdb_proc_service.h"
52 /* Prototypes for supply_gregset etc. */
55 #include "amd64-tdep.h"
56 #include "i386-linux-tdep.h"
57 #include "amd64-nat.h"
59 #include "i386-xstate.h"
61 #include "x86-linux-nat.h"
63 /* Mapping between the general-purpose registers in GNU/Linux x86-64
64 `struct user' format and GDB's register cache layout for GNU/Linux
67 Note that most GNU/Linux x86-64 registers are 64-bit, while the
68 GNU/Linux i386 registers are all 32-bit, but since we're
69 little-endian we get away with that. */
71 /* From <sys/reg.h> on GNU/Linux i386. */
72 static int amd64_linux_gregset32_reg_offset
[] =
74 RAX
* 8, RCX
* 8, /* %eax, %ecx */
75 RDX
* 8, RBX
* 8, /* %edx, %ebx */
76 RSP
* 8, RBP
* 8, /* %esp, %ebp */
77 RSI
* 8, RDI
* 8, /* %esi, %edi */
78 RIP
* 8, EFLAGS
* 8, /* %eip, %eflags */
79 CS
* 8, SS
* 8, /* %cs, %ss */
80 DS
* 8, ES
* 8, /* %ds, %es */
81 FS
* 8, GS
* 8, /* %fs, %gs */
82 -1, -1, -1, -1, -1, -1, -1, -1,
83 -1, -1, -1, -1, -1, -1, -1, -1,
84 -1, -1, -1, -1, -1, -1, -1, -1, -1,
85 -1, -1, -1, -1, -1, -1, -1, -1,
86 -1, -1, -1, -1, /* MPX registers BND0 ... BND3. */
87 -1, -1, /* MPX registers BNDCFGU, BNDSTATUS. */
88 -1, -1, -1, -1, -1, -1, -1, -1, /* k0 ... k7 (AVX512) */
89 -1, -1, -1, -1, -1, -1, -1, -1, /* zmm0 ... zmm7 (AVX512) */
90 ORIG_RAX
* 8 /* "orig_eax" */
94 /* Transfering the general-purpose registers between GDB, inferiors
97 /* Fill GDB's register cache with the general-purpose register values
101 supply_gregset (struct regcache
*regcache
, const elf_gregset_t
*gregsetp
)
103 amd64_supply_native_gregset (regcache
, gregsetp
, -1);
106 /* Fill register REGNUM (if it is a general-purpose register) in
107 *GREGSETP with the value in GDB's register cache. If REGNUM is -1,
108 do this for all registers. */
111 fill_gregset (const struct regcache
*regcache
,
112 elf_gregset_t
*gregsetp
, int regnum
)
114 amd64_collect_native_gregset (regcache
, gregsetp
, regnum
);
117 /* Transfering floating-point registers between GDB, inferiors and cores. */
119 /* Fill GDB's register cache with the floating-point and SSE register
120 values in *FPREGSETP. */
123 supply_fpregset (struct regcache
*regcache
, const elf_fpregset_t
*fpregsetp
)
125 amd64_supply_fxsave (regcache
, -1, fpregsetp
);
128 /* Fill register REGNUM (if it is a floating-point or SSE register) in
129 *FPREGSETP with the value in GDB's register cache. If REGNUM is
130 -1, do this for all registers. */
133 fill_fpregset (const struct regcache
*regcache
,
134 elf_fpregset_t
*fpregsetp
, int regnum
)
136 amd64_collect_fxsave (regcache
, regnum
, fpregsetp
);
140 /* Transferring arbitrary registers between GDB and inferior. */
142 /* Fetch register REGNUM from the child process. If REGNUM is -1, do
143 this for all registers (including the floating point and SSE
147 amd64_linux_fetch_inferior_registers (struct target_ops
*ops
,
148 struct regcache
*regcache
, int regnum
)
150 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
153 /* GNU/Linux LWP ID's are process ID's. */
154 tid
= ptid_get_lwp (inferior_ptid
);
156 tid
= ptid_get_pid (inferior_ptid
); /* Not a threaded program. */
158 if (regnum
== -1 || amd64_native_gregset_supplies_p (gdbarch
, regnum
))
162 if (ptrace (PTRACE_GETREGS
, tid
, 0, (long) ®s
) < 0)
163 perror_with_name (_("Couldn't get registers"));
165 amd64_supply_native_gregset (regcache
, ®s
, -1);
170 if (regnum
== -1 || !amd64_native_gregset_supplies_p (gdbarch
, regnum
))
172 elf_fpregset_t fpregs
;
174 if (have_ptrace_getregset
)
176 char xstateregs
[I386_XSTATE_MAX_SIZE
];
179 iov
.iov_base
= xstateregs
;
180 iov
.iov_len
= sizeof (xstateregs
);
181 if (ptrace (PTRACE_GETREGSET
, tid
,
182 (unsigned int) NT_X86_XSTATE
, (long) &iov
) < 0)
183 perror_with_name (_("Couldn't get extended state status"));
185 amd64_supply_xsave (regcache
, -1, xstateregs
);
189 if (ptrace (PTRACE_GETFPREGS
, tid
, 0, (long) &fpregs
) < 0)
190 perror_with_name (_("Couldn't get floating point status"));
192 amd64_supply_fxsave (regcache
, -1, &fpregs
);
197 /* Store register REGNUM back into the child process. If REGNUM is
198 -1, do this for all registers (including the floating-point and SSE
202 amd64_linux_store_inferior_registers (struct target_ops
*ops
,
203 struct regcache
*regcache
, int regnum
)
205 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
208 /* GNU/Linux LWP ID's are process ID's. */
209 tid
= ptid_get_lwp (inferior_ptid
);
211 tid
= ptid_get_pid (inferior_ptid
); /* Not a threaded program. */
213 if (regnum
== -1 || amd64_native_gregset_supplies_p (gdbarch
, regnum
))
217 if (ptrace (PTRACE_GETREGS
, tid
, 0, (long) ®s
) < 0)
218 perror_with_name (_("Couldn't get registers"));
220 amd64_collect_native_gregset (regcache
, ®s
, regnum
);
222 if (ptrace (PTRACE_SETREGS
, tid
, 0, (long) ®s
) < 0)
223 perror_with_name (_("Couldn't write registers"));
229 if (regnum
== -1 || !amd64_native_gregset_supplies_p (gdbarch
, regnum
))
231 elf_fpregset_t fpregs
;
233 if (have_ptrace_getregset
)
235 char xstateregs
[I386_XSTATE_MAX_SIZE
];
238 iov
.iov_base
= xstateregs
;
239 iov
.iov_len
= sizeof (xstateregs
);
240 if (ptrace (PTRACE_GETREGSET
, tid
,
241 (unsigned int) NT_X86_XSTATE
, (long) &iov
) < 0)
242 perror_with_name (_("Couldn't get extended state status"));
244 amd64_collect_xsave (regcache
, regnum
, xstateregs
, 0);
246 if (ptrace (PTRACE_SETREGSET
, tid
,
247 (unsigned int) NT_X86_XSTATE
, (long) &iov
) < 0)
248 perror_with_name (_("Couldn't write extended state status"));
252 if (ptrace (PTRACE_GETFPREGS
, tid
, 0, (long) &fpregs
) < 0)
253 perror_with_name (_("Couldn't get floating point status"));
255 amd64_collect_fxsave (regcache
, regnum
, &fpregs
);
257 if (ptrace (PTRACE_SETFPREGS
, tid
, 0, (long) &fpregs
) < 0)
258 perror_with_name (_("Couldn't write floating point status"));
264 /* This function is called by libthread_db as part of its handling of
265 a request for a thread's local storage address. */
268 ps_get_thread_area (const struct ps_prochandle
*ph
,
269 lwpid_t lwpid
, int idx
, void **base
)
271 if (gdbarch_bfd_arch_info (target_gdbarch ())->bits_per_word
== 32)
273 unsigned int base_addr
;
276 result
= x86_linux_get_thread_area (lwpid
, (void *) (long) idx
,
280 /* Extend the value to 64 bits. Here it's assumed that
281 a "long" and a "void *" are the same. */
282 (*base
) = (void *) (long) base_addr
;
288 /* This definition comes from prctl.h, but some kernels may not
290 #ifndef PTRACE_ARCH_PRCTL
291 #define PTRACE_ARCH_PRCTL 30
293 /* FIXME: ezannoni-2003-07-09 see comment above about include
294 file order. We could be getting bogus values for these two. */
295 gdb_assert (FS
< ELF_NGREG
);
296 gdb_assert (GS
< ELF_NGREG
);
300 #ifdef HAVE_STRUCT_USER_REGS_STRUCT_FS_BASE
302 /* PTRACE_ARCH_PRCTL is obsolete since 2.6.25, where the
303 fs_base and gs_base fields of user_regs_struct can be
307 fs
= ptrace (PTRACE_PEEKUSER
, lwpid
,
308 offsetof (struct user_regs_struct
, fs_base
), 0);
316 if (ptrace (PTRACE_ARCH_PRCTL
, lwpid
, base
, ARCH_GET_FS
) == 0)
320 #ifdef HAVE_STRUCT_USER_REGS_STRUCT_GS_BASE
324 gs
= ptrace (PTRACE_PEEKUSER
, lwpid
,
325 offsetof (struct user_regs_struct
, gs_base
), 0);
333 if (ptrace (PTRACE_ARCH_PRCTL
, lwpid
, base
, ARCH_GET_GS
) == 0)
336 default: /* Should not happen. */
340 return PS_ERR
; /* ptrace failed. */
344 /* When GDB is built as a 64-bit application on linux, the
345 PTRACE_GETSIGINFO data is always presented in 64-bit layout. Since
346 debugging a 32-bit inferior with a 64-bit GDB should look the same
347 as debugging it with a 32-bit GDB, we do the 32-bit <-> 64-bit
348 conversion in-place ourselves. */
350 /* These types below (compat_*) define a siginfo type that is layout
351 compatible with the siginfo type exported by the 32-bit userspace
354 typedef int compat_int_t
;
355 typedef unsigned int compat_uptr_t
;
357 typedef int compat_time_t
;
358 typedef int compat_timer_t
;
359 typedef int compat_clock_t
;
361 struct compat_timeval
363 compat_time_t tv_sec
;
367 typedef union compat_sigval
369 compat_int_t sival_int
;
370 compat_uptr_t sival_ptr
;
373 typedef struct compat_siginfo
381 int _pad
[((128 / sizeof (int)) - 3)];
390 /* POSIX.1b timers */
395 compat_sigval_t _sigval
;
398 /* POSIX.1b signals */
403 compat_sigval_t _sigval
;
412 compat_clock_t _utime
;
413 compat_clock_t _stime
;
416 /* SIGILL, SIGFPE, SIGSEGV, SIGBUS */
431 /* For x32, clock_t in _sigchld is 64bit aligned at 4 bytes. */
432 typedef struct compat_x32_clock
436 } compat_x32_clock_t
;
438 typedef struct compat_x32_siginfo
446 int _pad
[((128 / sizeof (int)) - 3)];
455 /* POSIX.1b timers */
460 compat_sigval_t _sigval
;
463 /* POSIX.1b signals */
468 compat_sigval_t _sigval
;
477 compat_x32_clock_t _utime
;
478 compat_x32_clock_t _stime
;
481 /* SIGILL, SIGFPE, SIGSEGV, SIGBUS */
494 } compat_x32_siginfo_t
;
496 #define cpt_si_pid _sifields._kill._pid
497 #define cpt_si_uid _sifields._kill._uid
498 #define cpt_si_timerid _sifields._timer._tid
499 #define cpt_si_overrun _sifields._timer._overrun
500 #define cpt_si_status _sifields._sigchld._status
501 #define cpt_si_utime _sifields._sigchld._utime
502 #define cpt_si_stime _sifields._sigchld._stime
503 #define cpt_si_ptr _sifields._rt._sigval.sival_ptr
504 #define cpt_si_addr _sifields._sigfault._addr
505 #define cpt_si_band _sifields._sigpoll._band
506 #define cpt_si_fd _sifields._sigpoll._fd
508 /* glibc at least up to 2.3.2 doesn't have si_timerid, si_overrun.
509 In their place is si_timer1,si_timer2. */
511 #define si_timerid si_timer1
514 #define si_overrun si_timer2
518 compat_siginfo_from_siginfo (compat_siginfo_t
*to
, siginfo_t
*from
)
520 memset (to
, 0, sizeof (*to
));
522 to
->si_signo
= from
->si_signo
;
523 to
->si_errno
= from
->si_errno
;
524 to
->si_code
= from
->si_code
;
526 if (to
->si_code
== SI_TIMER
)
528 to
->cpt_si_timerid
= from
->si_timerid
;
529 to
->cpt_si_overrun
= from
->si_overrun
;
530 to
->cpt_si_ptr
= (intptr_t) from
->si_ptr
;
532 else if (to
->si_code
== SI_USER
)
534 to
->cpt_si_pid
= from
->si_pid
;
535 to
->cpt_si_uid
= from
->si_uid
;
537 else if (to
->si_code
< 0)
539 to
->cpt_si_pid
= from
->si_pid
;
540 to
->cpt_si_uid
= from
->si_uid
;
541 to
->cpt_si_ptr
= (intptr_t) from
->si_ptr
;
545 switch (to
->si_signo
)
548 to
->cpt_si_pid
= from
->si_pid
;
549 to
->cpt_si_uid
= from
->si_uid
;
550 to
->cpt_si_status
= from
->si_status
;
551 to
->cpt_si_utime
= from
->si_utime
;
552 to
->cpt_si_stime
= from
->si_stime
;
558 to
->cpt_si_addr
= (intptr_t) from
->si_addr
;
561 to
->cpt_si_band
= from
->si_band
;
562 to
->cpt_si_fd
= from
->si_fd
;
565 to
->cpt_si_pid
= from
->si_pid
;
566 to
->cpt_si_uid
= from
->si_uid
;
567 to
->cpt_si_ptr
= (intptr_t) from
->si_ptr
;
574 siginfo_from_compat_siginfo (siginfo_t
*to
, compat_siginfo_t
*from
)
576 memset (to
, 0, sizeof (*to
));
578 to
->si_signo
= from
->si_signo
;
579 to
->si_errno
= from
->si_errno
;
580 to
->si_code
= from
->si_code
;
582 if (to
->si_code
== SI_TIMER
)
584 to
->si_timerid
= from
->cpt_si_timerid
;
585 to
->si_overrun
= from
->cpt_si_overrun
;
586 to
->si_ptr
= (void *) (intptr_t) from
->cpt_si_ptr
;
588 else if (to
->si_code
== SI_USER
)
590 to
->si_pid
= from
->cpt_si_pid
;
591 to
->si_uid
= from
->cpt_si_uid
;
595 to
->si_pid
= from
->cpt_si_pid
;
596 to
->si_uid
= from
->cpt_si_uid
;
597 to
->si_ptr
= (void *) (intptr_t) from
->cpt_si_ptr
;
601 switch (to
->si_signo
)
604 to
->si_pid
= from
->cpt_si_pid
;
605 to
->si_uid
= from
->cpt_si_uid
;
606 to
->si_status
= from
->cpt_si_status
;
607 to
->si_utime
= from
->cpt_si_utime
;
608 to
->si_stime
= from
->cpt_si_stime
;
614 to
->si_addr
= (void *) (intptr_t) from
->cpt_si_addr
;
617 to
->si_band
= from
->cpt_si_band
;
618 to
->si_fd
= from
->cpt_si_fd
;
621 to
->si_pid
= from
->cpt_si_pid
;
622 to
->si_uid
= from
->cpt_si_uid
;
623 to
->si_ptr
= (void* ) (intptr_t) from
->cpt_si_ptr
;
630 compat_x32_siginfo_from_siginfo (compat_x32_siginfo_t
*to
,
633 memset (to
, 0, sizeof (*to
));
635 to
->si_signo
= from
->si_signo
;
636 to
->si_errno
= from
->si_errno
;
637 to
->si_code
= from
->si_code
;
639 if (to
->si_code
== SI_TIMER
)
641 to
->cpt_si_timerid
= from
->si_timerid
;
642 to
->cpt_si_overrun
= from
->si_overrun
;
643 to
->cpt_si_ptr
= (intptr_t) from
->si_ptr
;
645 else if (to
->si_code
== SI_USER
)
647 to
->cpt_si_pid
= from
->si_pid
;
648 to
->cpt_si_uid
= from
->si_uid
;
650 else if (to
->si_code
< 0)
652 to
->cpt_si_pid
= from
->si_pid
;
653 to
->cpt_si_uid
= from
->si_uid
;
654 to
->cpt_si_ptr
= (intptr_t) from
->si_ptr
;
658 switch (to
->si_signo
)
661 to
->cpt_si_pid
= from
->si_pid
;
662 to
->cpt_si_uid
= from
->si_uid
;
663 to
->cpt_si_status
= from
->si_status
;
664 memcpy (&to
->cpt_si_utime
, &from
->si_utime
,
665 sizeof (to
->cpt_si_utime
));
666 memcpy (&to
->cpt_si_stime
, &from
->si_stime
,
667 sizeof (to
->cpt_si_stime
));
673 to
->cpt_si_addr
= (intptr_t) from
->si_addr
;
676 to
->cpt_si_band
= from
->si_band
;
677 to
->cpt_si_fd
= from
->si_fd
;
680 to
->cpt_si_pid
= from
->si_pid
;
681 to
->cpt_si_uid
= from
->si_uid
;
682 to
->cpt_si_ptr
= (intptr_t) from
->si_ptr
;
689 siginfo_from_compat_x32_siginfo (siginfo_t
*to
,
690 compat_x32_siginfo_t
*from
)
692 memset (to
, 0, sizeof (*to
));
694 to
->si_signo
= from
->si_signo
;
695 to
->si_errno
= from
->si_errno
;
696 to
->si_code
= from
->si_code
;
698 if (to
->si_code
== SI_TIMER
)
700 to
->si_timerid
= from
->cpt_si_timerid
;
701 to
->si_overrun
= from
->cpt_si_overrun
;
702 to
->si_ptr
= (void *) (intptr_t) from
->cpt_si_ptr
;
704 else if (to
->si_code
== SI_USER
)
706 to
->si_pid
= from
->cpt_si_pid
;
707 to
->si_uid
= from
->cpt_si_uid
;
711 to
->si_pid
= from
->cpt_si_pid
;
712 to
->si_uid
= from
->cpt_si_uid
;
713 to
->si_ptr
= (void *) (intptr_t) from
->cpt_si_ptr
;
717 switch (to
->si_signo
)
720 to
->si_pid
= from
->cpt_si_pid
;
721 to
->si_uid
= from
->cpt_si_uid
;
722 to
->si_status
= from
->cpt_si_status
;
723 memcpy (&to
->si_utime
, &from
->cpt_si_utime
,
724 sizeof (to
->si_utime
));
725 memcpy (&to
->si_stime
, &from
->cpt_si_stime
,
726 sizeof (to
->si_stime
));
732 to
->si_addr
= (void *) (intptr_t) from
->cpt_si_addr
;
735 to
->si_band
= from
->cpt_si_band
;
736 to
->si_fd
= from
->cpt_si_fd
;
739 to
->si_pid
= from
->cpt_si_pid
;
740 to
->si_uid
= from
->cpt_si_uid
;
741 to
->si_ptr
= (void* ) (intptr_t) from
->cpt_si_ptr
;
747 /* Convert a native/host siginfo object, into/from the siginfo in the
748 layout of the inferiors' architecture. Returns true if any
749 conversion was done; false otherwise. If DIRECTION is 1, then copy
750 from INF to NATIVE. If DIRECTION is 0, copy from NATIVE to
754 amd64_linux_siginfo_fixup (siginfo_t
*native
, gdb_byte
*inf
, int direction
)
756 struct gdbarch
*gdbarch
= get_frame_arch (get_current_frame ());
758 /* Is the inferior 32-bit? If so, then do fixup the siginfo
760 if (gdbarch_bfd_arch_info (gdbarch
)->bits_per_word
== 32)
762 gdb_assert (sizeof (siginfo_t
) == sizeof (compat_siginfo_t
));
765 compat_siginfo_from_siginfo ((struct compat_siginfo
*) inf
, native
);
767 siginfo_from_compat_siginfo (native
, (struct compat_siginfo
*) inf
);
771 /* No fixup for native x32 GDB. */
772 else if (gdbarch_addr_bit (gdbarch
) == 32 && sizeof (void *) == 8)
774 gdb_assert (sizeof (siginfo_t
) == sizeof (compat_x32_siginfo_t
));
777 compat_x32_siginfo_from_siginfo ((struct compat_x32_siginfo
*) inf
,
780 siginfo_from_compat_x32_siginfo (native
,
781 (struct compat_x32_siginfo
*) inf
);
790 /* Provide a prototype to silence -Wmissing-prototypes. */
791 void _initialize_amd64_linux_nat (void);
794 _initialize_amd64_linux_nat (void)
796 struct target_ops
*t
;
798 amd64_native_gregset32_reg_offset
= amd64_linux_gregset32_reg_offset
;
799 amd64_native_gregset32_num_regs
= I386_LINUX_NUM_REGS
;
800 amd64_native_gregset64_reg_offset
= amd64_linux_gregset_reg_offset
;
801 amd64_native_gregset64_num_regs
= AMD64_LINUX_NUM_REGS
;
803 gdb_assert (ARRAY_SIZE (amd64_linux_gregset32_reg_offset
)
804 == amd64_native_gregset32_num_regs
);
806 /* Create a generic x86 GNU/Linux target. */
807 t
= x86_linux_create_target ();
809 /* Add our register access methods. */
810 t
->to_fetch_registers
= amd64_linux_fetch_inferior_registers
;
811 t
->to_store_registers
= amd64_linux_store_inferior_registers
;
813 /* Add the target. */
814 x86_linux_add_target (t
);
816 /* Add our siginfo layout converter. */
817 linux_nat_set_siginfo_fixup (t
, amd64_linux_siginfo_fixup
);