1 /* Native-dependent code for GNU/Linux x86-64.
3 Copyright (C) 2001-2015 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/>. */
24 #include "elf/common.h"
26 #include "nat/gdb_ptrace.h"
27 #include <asm/prctl.h>
30 #include "gdb_proc_service.h"
32 #include "amd64-nat.h"
33 #include "linux-nat.h"
34 #include "amd64-tdep.h"
35 #include "amd64-linux-tdep.h"
36 #include "i386-linux-tdep.h"
37 #include "x86-xstate.h"
39 #include "x86-linux-nat.h"
40 #include "nat/linux-ptrace.h"
42 /* Mapping between the general-purpose registers in GNU/Linux x86-64
43 `struct user' format and GDB's register cache layout for GNU/Linux
46 Note that most GNU/Linux x86-64 registers are 64-bit, while the
47 GNU/Linux i386 registers are all 32-bit, but since we're
48 little-endian we get away with that. */
50 /* From <sys/reg.h> on GNU/Linux i386. */
51 static int amd64_linux_gregset32_reg_offset
[] =
53 RAX
* 8, RCX
* 8, /* %eax, %ecx */
54 RDX
* 8, RBX
* 8, /* %edx, %ebx */
55 RSP
* 8, RBP
* 8, /* %esp, %ebp */
56 RSI
* 8, RDI
* 8, /* %esi, %edi */
57 RIP
* 8, EFLAGS
* 8, /* %eip, %eflags */
58 CS
* 8, SS
* 8, /* %cs, %ss */
59 DS
* 8, ES
* 8, /* %ds, %es */
60 FS
* 8, GS
* 8, /* %fs, %gs */
61 -1, -1, -1, -1, -1, -1, -1, -1,
62 -1, -1, -1, -1, -1, -1, -1, -1,
63 -1, -1, -1, -1, -1, -1, -1, -1, -1,
64 -1, -1, -1, -1, -1, -1, -1, -1,
65 -1, -1, -1, -1, /* MPX registers BND0 ... BND3. */
66 -1, -1, /* MPX registers BNDCFGU, BNDSTATUS. */
67 -1, -1, -1, -1, -1, -1, -1, -1, /* k0 ... k7 (AVX512) */
68 -1, -1, -1, -1, -1, -1, -1, -1, /* zmm0 ... zmm7 (AVX512) */
69 ORIG_RAX
* 8 /* "orig_eax" */
73 /* Transfering the general-purpose registers between GDB, inferiors
76 /* Fill GDB's register cache with the general-purpose register values
80 supply_gregset (struct regcache
*regcache
, const elf_gregset_t
*gregsetp
)
82 amd64_supply_native_gregset (regcache
, gregsetp
, -1);
85 /* Fill register REGNUM (if it is a general-purpose register) in
86 *GREGSETP with the value in GDB's register cache. If REGNUM is -1,
87 do this for all registers. */
90 fill_gregset (const struct regcache
*regcache
,
91 elf_gregset_t
*gregsetp
, int regnum
)
93 amd64_collect_native_gregset (regcache
, gregsetp
, regnum
);
96 /* Transfering floating-point registers between GDB, inferiors and cores. */
98 /* Fill GDB's register cache with the floating-point and SSE register
99 values in *FPREGSETP. */
102 supply_fpregset (struct regcache
*regcache
, const elf_fpregset_t
*fpregsetp
)
104 amd64_supply_fxsave (regcache
, -1, fpregsetp
);
107 /* Fill register REGNUM (if it is a floating-point or SSE register) in
108 *FPREGSETP with the value in GDB's register cache. If REGNUM is
109 -1, do this for all registers. */
112 fill_fpregset (const struct regcache
*regcache
,
113 elf_fpregset_t
*fpregsetp
, int regnum
)
115 amd64_collect_fxsave (regcache
, regnum
, fpregsetp
);
119 /* Transferring arbitrary registers between GDB and inferior. */
121 /* Fetch register REGNUM from the child process. If REGNUM is -1, do
122 this for all registers (including the floating point and SSE
126 amd64_linux_fetch_inferior_registers (struct target_ops
*ops
,
127 struct regcache
*regcache
, int regnum
)
129 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
132 /* GNU/Linux LWP ID's are process ID's. */
133 tid
= ptid_get_lwp (inferior_ptid
);
135 tid
= ptid_get_pid (inferior_ptid
); /* Not a threaded program. */
137 if (regnum
== -1 || amd64_native_gregset_supplies_p (gdbarch
, regnum
))
141 if (ptrace (PTRACE_GETREGS
, tid
, 0, (long) ®s
) < 0)
142 perror_with_name (_("Couldn't get registers"));
144 amd64_supply_native_gregset (regcache
, ®s
, -1);
149 if (regnum
== -1 || !amd64_native_gregset_supplies_p (gdbarch
, regnum
))
151 elf_fpregset_t fpregs
;
153 if (have_ptrace_getregset
== TRIBOOL_TRUE
)
155 char xstateregs
[X86_XSTATE_MAX_SIZE
];
158 iov
.iov_base
= xstateregs
;
159 iov
.iov_len
= sizeof (xstateregs
);
160 if (ptrace (PTRACE_GETREGSET
, tid
,
161 (unsigned int) NT_X86_XSTATE
, (long) &iov
) < 0)
162 perror_with_name (_("Couldn't get extended state status"));
164 amd64_supply_xsave (regcache
, -1, xstateregs
);
168 if (ptrace (PTRACE_GETFPREGS
, tid
, 0, (long) &fpregs
) < 0)
169 perror_with_name (_("Couldn't get floating point status"));
171 amd64_supply_fxsave (regcache
, -1, &fpregs
);
176 /* Store register REGNUM back into the child process. If REGNUM is
177 -1, do this for all registers (including the floating-point and SSE
181 amd64_linux_store_inferior_registers (struct target_ops
*ops
,
182 struct regcache
*regcache
, int regnum
)
184 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
187 /* GNU/Linux LWP ID's are process ID's. */
188 tid
= ptid_get_lwp (inferior_ptid
);
190 tid
= ptid_get_pid (inferior_ptid
); /* Not a threaded program. */
192 if (regnum
== -1 || amd64_native_gregset_supplies_p (gdbarch
, regnum
))
196 if (ptrace (PTRACE_GETREGS
, tid
, 0, (long) ®s
) < 0)
197 perror_with_name (_("Couldn't get registers"));
199 amd64_collect_native_gregset (regcache
, ®s
, regnum
);
201 if (ptrace (PTRACE_SETREGS
, tid
, 0, (long) ®s
) < 0)
202 perror_with_name (_("Couldn't write registers"));
208 if (regnum
== -1 || !amd64_native_gregset_supplies_p (gdbarch
, regnum
))
210 elf_fpregset_t fpregs
;
212 if (have_ptrace_getregset
== TRIBOOL_TRUE
)
214 char xstateregs
[X86_XSTATE_MAX_SIZE
];
217 iov
.iov_base
= xstateregs
;
218 iov
.iov_len
= sizeof (xstateregs
);
219 if (ptrace (PTRACE_GETREGSET
, tid
,
220 (unsigned int) NT_X86_XSTATE
, (long) &iov
) < 0)
221 perror_with_name (_("Couldn't get extended state status"));
223 amd64_collect_xsave (regcache
, regnum
, xstateregs
, 0);
225 if (ptrace (PTRACE_SETREGSET
, tid
,
226 (unsigned int) NT_X86_XSTATE
, (long) &iov
) < 0)
227 perror_with_name (_("Couldn't write extended state status"));
231 if (ptrace (PTRACE_GETFPREGS
, tid
, 0, (long) &fpregs
) < 0)
232 perror_with_name (_("Couldn't get floating point status"));
234 amd64_collect_fxsave (regcache
, regnum
, &fpregs
);
236 if (ptrace (PTRACE_SETFPREGS
, tid
, 0, (long) &fpregs
) < 0)
237 perror_with_name (_("Couldn't write floating point status"));
243 /* This function is called by libthread_db as part of its handling of
244 a request for a thread's local storage address. */
247 ps_get_thread_area (const struct ps_prochandle
*ph
,
248 lwpid_t lwpid
, int idx
, void **base
)
250 if (gdbarch_bfd_arch_info (target_gdbarch ())->bits_per_word
== 32)
252 unsigned int base_addr
;
255 result
= x86_linux_get_thread_area (lwpid
, (void *) (long) idx
,
259 /* Extend the value to 64 bits. Here it's assumed that
260 a "long" and a "void *" are the same. */
261 (*base
) = (void *) (long) base_addr
;
267 /* This definition comes from prctl.h, but some kernels may not
269 #ifndef PTRACE_ARCH_PRCTL
270 #define PTRACE_ARCH_PRCTL 30
272 /* FIXME: ezannoni-2003-07-09 see comment above about include
273 file order. We could be getting bogus values for these two. */
274 gdb_assert (FS
< ELF_NGREG
);
275 gdb_assert (GS
< ELF_NGREG
);
279 #ifdef HAVE_STRUCT_USER_REGS_STRUCT_FS_BASE
281 /* PTRACE_ARCH_PRCTL is obsolete since 2.6.25, where the
282 fs_base and gs_base fields of user_regs_struct can be
286 fs
= ptrace (PTRACE_PEEKUSER
, lwpid
,
287 offsetof (struct user_regs_struct
, fs_base
), 0);
295 if (ptrace (PTRACE_ARCH_PRCTL
, lwpid
, base
, ARCH_GET_FS
) == 0)
299 #ifdef HAVE_STRUCT_USER_REGS_STRUCT_GS_BASE
303 gs
= ptrace (PTRACE_PEEKUSER
, lwpid
,
304 offsetof (struct user_regs_struct
, gs_base
), 0);
312 if (ptrace (PTRACE_ARCH_PRCTL
, lwpid
, base
, ARCH_GET_GS
) == 0)
315 default: /* Should not happen. */
319 return PS_ERR
; /* ptrace failed. */
323 /* When GDB is built as a 64-bit application on linux, the
324 PTRACE_GETSIGINFO data is always presented in 64-bit layout. Since
325 debugging a 32-bit inferior with a 64-bit GDB should look the same
326 as debugging it with a 32-bit GDB, we do the 32-bit <-> 64-bit
327 conversion in-place ourselves. */
329 /* These types below (compat_*) define a siginfo type that is layout
330 compatible with the siginfo type exported by the 32-bit userspace
333 typedef int compat_int_t
;
334 typedef unsigned int compat_uptr_t
;
336 typedef int compat_time_t
;
337 typedef int compat_timer_t
;
338 typedef int compat_clock_t
;
340 struct compat_timeval
342 compat_time_t tv_sec
;
346 typedef union compat_sigval
348 compat_int_t sival_int
;
349 compat_uptr_t sival_ptr
;
352 typedef struct compat_siginfo
360 int _pad
[((128 / sizeof (int)) - 3)];
369 /* POSIX.1b timers */
374 compat_sigval_t _sigval
;
377 /* POSIX.1b signals */
382 compat_sigval_t _sigval
;
391 compat_clock_t _utime
;
392 compat_clock_t _stime
;
395 /* SIGILL, SIGFPE, SIGSEGV, SIGBUS */
410 /* For x32, clock_t in _sigchld is 64bit aligned at 4 bytes. */
411 typedef struct compat_x32_clock
415 } compat_x32_clock_t
;
417 typedef struct compat_x32_siginfo
425 int _pad
[((128 / sizeof (int)) - 3)];
434 /* POSIX.1b timers */
439 compat_sigval_t _sigval
;
442 /* POSIX.1b signals */
447 compat_sigval_t _sigval
;
456 compat_x32_clock_t _utime
;
457 compat_x32_clock_t _stime
;
460 /* SIGILL, SIGFPE, SIGSEGV, SIGBUS */
473 } compat_x32_siginfo_t
;
475 #define cpt_si_pid _sifields._kill._pid
476 #define cpt_si_uid _sifields._kill._uid
477 #define cpt_si_timerid _sifields._timer._tid
478 #define cpt_si_overrun _sifields._timer._overrun
479 #define cpt_si_status _sifields._sigchld._status
480 #define cpt_si_utime _sifields._sigchld._utime
481 #define cpt_si_stime _sifields._sigchld._stime
482 #define cpt_si_ptr _sifields._rt._sigval.sival_ptr
483 #define cpt_si_addr _sifields._sigfault._addr
484 #define cpt_si_band _sifields._sigpoll._band
485 #define cpt_si_fd _sifields._sigpoll._fd
487 /* glibc at least up to 2.3.2 doesn't have si_timerid, si_overrun.
488 In their place is si_timer1,si_timer2. */
490 #define si_timerid si_timer1
493 #define si_overrun si_timer2
497 compat_siginfo_from_siginfo (compat_siginfo_t
*to
, siginfo_t
*from
)
499 memset (to
, 0, sizeof (*to
));
501 to
->si_signo
= from
->si_signo
;
502 to
->si_errno
= from
->si_errno
;
503 to
->si_code
= from
->si_code
;
505 if (to
->si_code
== SI_TIMER
)
507 to
->cpt_si_timerid
= from
->si_timerid
;
508 to
->cpt_si_overrun
= from
->si_overrun
;
509 to
->cpt_si_ptr
= (intptr_t) from
->si_ptr
;
511 else if (to
->si_code
== SI_USER
)
513 to
->cpt_si_pid
= from
->si_pid
;
514 to
->cpt_si_uid
= from
->si_uid
;
516 else if (to
->si_code
< 0)
518 to
->cpt_si_pid
= from
->si_pid
;
519 to
->cpt_si_uid
= from
->si_uid
;
520 to
->cpt_si_ptr
= (intptr_t) from
->si_ptr
;
524 switch (to
->si_signo
)
527 to
->cpt_si_pid
= from
->si_pid
;
528 to
->cpt_si_uid
= from
->si_uid
;
529 to
->cpt_si_status
= from
->si_status
;
530 to
->cpt_si_utime
= from
->si_utime
;
531 to
->cpt_si_stime
= from
->si_stime
;
537 to
->cpt_si_addr
= (intptr_t) from
->si_addr
;
540 to
->cpt_si_band
= from
->si_band
;
541 to
->cpt_si_fd
= from
->si_fd
;
544 to
->cpt_si_pid
= from
->si_pid
;
545 to
->cpt_si_uid
= from
->si_uid
;
546 to
->cpt_si_ptr
= (intptr_t) from
->si_ptr
;
553 siginfo_from_compat_siginfo (siginfo_t
*to
, compat_siginfo_t
*from
)
555 memset (to
, 0, sizeof (*to
));
557 to
->si_signo
= from
->si_signo
;
558 to
->si_errno
= from
->si_errno
;
559 to
->si_code
= from
->si_code
;
561 if (to
->si_code
== SI_TIMER
)
563 to
->si_timerid
= from
->cpt_si_timerid
;
564 to
->si_overrun
= from
->cpt_si_overrun
;
565 to
->si_ptr
= (void *) (intptr_t) from
->cpt_si_ptr
;
567 else if (to
->si_code
== SI_USER
)
569 to
->si_pid
= from
->cpt_si_pid
;
570 to
->si_uid
= from
->cpt_si_uid
;
574 to
->si_pid
= from
->cpt_si_pid
;
575 to
->si_uid
= from
->cpt_si_uid
;
576 to
->si_ptr
= (void *) (intptr_t) from
->cpt_si_ptr
;
580 switch (to
->si_signo
)
583 to
->si_pid
= from
->cpt_si_pid
;
584 to
->si_uid
= from
->cpt_si_uid
;
585 to
->si_status
= from
->cpt_si_status
;
586 to
->si_utime
= from
->cpt_si_utime
;
587 to
->si_stime
= from
->cpt_si_stime
;
593 to
->si_addr
= (void *) (intptr_t) from
->cpt_si_addr
;
596 to
->si_band
= from
->cpt_si_band
;
597 to
->si_fd
= from
->cpt_si_fd
;
600 to
->si_pid
= from
->cpt_si_pid
;
601 to
->si_uid
= from
->cpt_si_uid
;
602 to
->si_ptr
= (void* ) (intptr_t) from
->cpt_si_ptr
;
609 compat_x32_siginfo_from_siginfo (compat_x32_siginfo_t
*to
,
612 memset (to
, 0, sizeof (*to
));
614 to
->si_signo
= from
->si_signo
;
615 to
->si_errno
= from
->si_errno
;
616 to
->si_code
= from
->si_code
;
618 if (to
->si_code
== SI_TIMER
)
620 to
->cpt_si_timerid
= from
->si_timerid
;
621 to
->cpt_si_overrun
= from
->si_overrun
;
622 to
->cpt_si_ptr
= (intptr_t) from
->si_ptr
;
624 else if (to
->si_code
== SI_USER
)
626 to
->cpt_si_pid
= from
->si_pid
;
627 to
->cpt_si_uid
= from
->si_uid
;
629 else if (to
->si_code
< 0)
631 to
->cpt_si_pid
= from
->si_pid
;
632 to
->cpt_si_uid
= from
->si_uid
;
633 to
->cpt_si_ptr
= (intptr_t) from
->si_ptr
;
637 switch (to
->si_signo
)
640 to
->cpt_si_pid
= from
->si_pid
;
641 to
->cpt_si_uid
= from
->si_uid
;
642 to
->cpt_si_status
= from
->si_status
;
643 memcpy (&to
->cpt_si_utime
, &from
->si_utime
,
644 sizeof (to
->cpt_si_utime
));
645 memcpy (&to
->cpt_si_stime
, &from
->si_stime
,
646 sizeof (to
->cpt_si_stime
));
652 to
->cpt_si_addr
= (intptr_t) from
->si_addr
;
655 to
->cpt_si_band
= from
->si_band
;
656 to
->cpt_si_fd
= from
->si_fd
;
659 to
->cpt_si_pid
= from
->si_pid
;
660 to
->cpt_si_uid
= from
->si_uid
;
661 to
->cpt_si_ptr
= (intptr_t) from
->si_ptr
;
668 siginfo_from_compat_x32_siginfo (siginfo_t
*to
,
669 compat_x32_siginfo_t
*from
)
671 memset (to
, 0, sizeof (*to
));
673 to
->si_signo
= from
->si_signo
;
674 to
->si_errno
= from
->si_errno
;
675 to
->si_code
= from
->si_code
;
677 if (to
->si_code
== SI_TIMER
)
679 to
->si_timerid
= from
->cpt_si_timerid
;
680 to
->si_overrun
= from
->cpt_si_overrun
;
681 to
->si_ptr
= (void *) (intptr_t) from
->cpt_si_ptr
;
683 else if (to
->si_code
== SI_USER
)
685 to
->si_pid
= from
->cpt_si_pid
;
686 to
->si_uid
= from
->cpt_si_uid
;
690 to
->si_pid
= from
->cpt_si_pid
;
691 to
->si_uid
= from
->cpt_si_uid
;
692 to
->si_ptr
= (void *) (intptr_t) from
->cpt_si_ptr
;
696 switch (to
->si_signo
)
699 to
->si_pid
= from
->cpt_si_pid
;
700 to
->si_uid
= from
->cpt_si_uid
;
701 to
->si_status
= from
->cpt_si_status
;
702 memcpy (&to
->si_utime
, &from
->cpt_si_utime
,
703 sizeof (to
->si_utime
));
704 memcpy (&to
->si_stime
, &from
->cpt_si_stime
,
705 sizeof (to
->si_stime
));
711 to
->si_addr
= (void *) (intptr_t) from
->cpt_si_addr
;
714 to
->si_band
= from
->cpt_si_band
;
715 to
->si_fd
= from
->cpt_si_fd
;
718 to
->si_pid
= from
->cpt_si_pid
;
719 to
->si_uid
= from
->cpt_si_uid
;
720 to
->si_ptr
= (void* ) (intptr_t) from
->cpt_si_ptr
;
726 /* Convert a native/host siginfo object, into/from the siginfo in the
727 layout of the inferiors' architecture. Returns true if any
728 conversion was done; false otherwise. If DIRECTION is 1, then copy
729 from INF to NATIVE. If DIRECTION is 0, copy from NATIVE to
733 amd64_linux_siginfo_fixup (siginfo_t
*native
, gdb_byte
*inf
, int direction
)
735 struct gdbarch
*gdbarch
= get_frame_arch (get_current_frame ());
737 /* Is the inferior 32-bit? If so, then do fixup the siginfo
739 if (gdbarch_bfd_arch_info (gdbarch
)->bits_per_word
== 32)
741 gdb_assert (sizeof (siginfo_t
) == sizeof (compat_siginfo_t
));
744 compat_siginfo_from_siginfo ((struct compat_siginfo
*) inf
, native
);
746 siginfo_from_compat_siginfo (native
, (struct compat_siginfo
*) inf
);
750 /* No fixup for native x32 GDB. */
751 else if (gdbarch_addr_bit (gdbarch
) == 32 && sizeof (void *) == 8)
753 gdb_assert (sizeof (siginfo_t
) == sizeof (compat_x32_siginfo_t
));
756 compat_x32_siginfo_from_siginfo ((struct compat_x32_siginfo
*) inf
,
759 siginfo_from_compat_x32_siginfo (native
,
760 (struct compat_x32_siginfo
*) inf
);
769 /* Provide a prototype to silence -Wmissing-prototypes. */
770 void _initialize_amd64_linux_nat (void);
773 _initialize_amd64_linux_nat (void)
775 struct target_ops
*t
;
777 amd64_native_gregset32_reg_offset
= amd64_linux_gregset32_reg_offset
;
778 amd64_native_gregset32_num_regs
= I386_LINUX_NUM_REGS
;
779 amd64_native_gregset64_reg_offset
= amd64_linux_gregset_reg_offset
;
780 amd64_native_gregset64_num_regs
= AMD64_LINUX_NUM_REGS
;
782 gdb_assert (ARRAY_SIZE (amd64_linux_gregset32_reg_offset
)
783 == amd64_native_gregset32_num_regs
);
785 /* Create a generic x86 GNU/Linux target. */
786 t
= x86_linux_create_target ();
788 /* Add our register access methods. */
789 t
->to_fetch_registers
= amd64_linux_fetch_inferior_registers
;
790 t
->to_store_registers
= amd64_linux_store_inferior_registers
;
792 /* Add the target. */
793 x86_linux_add_target (t
);
795 /* Add our siginfo layout converter. */
796 linux_nat_set_siginfo_fixup (t
, amd64_linux_siginfo_fixup
);