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/>. */
24 #include "elf/common.h"
25 #include <sys/ptrace.h>
26 #include <asm/prctl.h>
29 #include "gdb_proc_service.h"
31 #include "amd64-nat.h"
32 #include "linux-nat.h"
33 #include "amd64-tdep.h"
34 #include "amd64-linux-tdep.h"
35 #include "i386-linux-tdep.h"
36 #include "x86-xstate.h"
38 #include "x86-linux-nat.h"
40 /* Mapping between the general-purpose registers in GNU/Linux x86-64
41 `struct user' format and GDB's register cache layout for GNU/Linux
44 Note that most GNU/Linux x86-64 registers are 64-bit, while the
45 GNU/Linux i386 registers are all 32-bit, but since we're
46 little-endian we get away with that. */
48 /* From <sys/reg.h> on GNU/Linux i386. */
49 static int amd64_linux_gregset32_reg_offset
[] =
51 RAX
* 8, RCX
* 8, /* %eax, %ecx */
52 RDX
* 8, RBX
* 8, /* %edx, %ebx */
53 RSP
* 8, RBP
* 8, /* %esp, %ebp */
54 RSI
* 8, RDI
* 8, /* %esi, %edi */
55 RIP
* 8, EFLAGS
* 8, /* %eip, %eflags */
56 CS
* 8, SS
* 8, /* %cs, %ss */
57 DS
* 8, ES
* 8, /* %ds, %es */
58 FS
* 8, GS
* 8, /* %fs, %gs */
59 -1, -1, -1, -1, -1, -1, -1, -1,
60 -1, -1, -1, -1, -1, -1, -1, -1,
61 -1, -1, -1, -1, -1, -1, -1, -1, -1,
62 -1, -1, -1, -1, -1, -1, -1, -1,
63 -1, -1, -1, -1, /* MPX registers BND0 ... BND3. */
64 -1, -1, /* MPX registers BNDCFGU, BNDSTATUS. */
65 -1, -1, -1, -1, -1, -1, -1, -1, /* k0 ... k7 (AVX512) */
66 -1, -1, -1, -1, -1, -1, -1, -1, /* zmm0 ... zmm7 (AVX512) */
67 ORIG_RAX
* 8 /* "orig_eax" */
71 /* Transfering the general-purpose registers between GDB, inferiors
74 /* Fill GDB's register cache with the general-purpose register values
78 supply_gregset (struct regcache
*regcache
, const elf_gregset_t
*gregsetp
)
80 amd64_supply_native_gregset (regcache
, gregsetp
, -1);
83 /* Fill register REGNUM (if it is a general-purpose register) in
84 *GREGSETP with the value in GDB's register cache. If REGNUM is -1,
85 do this for all registers. */
88 fill_gregset (const struct regcache
*regcache
,
89 elf_gregset_t
*gregsetp
, int regnum
)
91 amd64_collect_native_gregset (regcache
, gregsetp
, regnum
);
94 /* Transfering floating-point registers between GDB, inferiors and cores. */
96 /* Fill GDB's register cache with the floating-point and SSE register
97 values in *FPREGSETP. */
100 supply_fpregset (struct regcache
*regcache
, const elf_fpregset_t
*fpregsetp
)
102 amd64_supply_fxsave (regcache
, -1, fpregsetp
);
105 /* Fill register REGNUM (if it is a floating-point or SSE register) in
106 *FPREGSETP with the value in GDB's register cache. If REGNUM is
107 -1, do this for all registers. */
110 fill_fpregset (const struct regcache
*regcache
,
111 elf_fpregset_t
*fpregsetp
, int regnum
)
113 amd64_collect_fxsave (regcache
, regnum
, fpregsetp
);
117 /* Transferring arbitrary registers between GDB and inferior. */
119 /* Fetch register REGNUM from the child process. If REGNUM is -1, do
120 this for all registers (including the floating point and SSE
124 amd64_linux_fetch_inferior_registers (struct target_ops
*ops
,
125 struct regcache
*regcache
, int regnum
)
127 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
130 /* GNU/Linux LWP ID's are process ID's. */
131 tid
= ptid_get_lwp (inferior_ptid
);
133 tid
= ptid_get_pid (inferior_ptid
); /* Not a threaded program. */
135 if (regnum
== -1 || amd64_native_gregset_supplies_p (gdbarch
, regnum
))
139 if (ptrace (PTRACE_GETREGS
, tid
, 0, (long) ®s
) < 0)
140 perror_with_name (_("Couldn't get registers"));
142 amd64_supply_native_gregset (regcache
, ®s
, -1);
147 if (regnum
== -1 || !amd64_native_gregset_supplies_p (gdbarch
, regnum
))
149 elf_fpregset_t fpregs
;
151 if (have_ptrace_getregset
)
153 char xstateregs
[X86_XSTATE_MAX_SIZE
];
156 iov
.iov_base
= xstateregs
;
157 iov
.iov_len
= sizeof (xstateregs
);
158 if (ptrace (PTRACE_GETREGSET
, tid
,
159 (unsigned int) NT_X86_XSTATE
, (long) &iov
) < 0)
160 perror_with_name (_("Couldn't get extended state status"));
162 amd64_supply_xsave (regcache
, -1, xstateregs
);
166 if (ptrace (PTRACE_GETFPREGS
, tid
, 0, (long) &fpregs
) < 0)
167 perror_with_name (_("Couldn't get floating point status"));
169 amd64_supply_fxsave (regcache
, -1, &fpregs
);
174 /* Store register REGNUM back into the child process. If REGNUM is
175 -1, do this for all registers (including the floating-point and SSE
179 amd64_linux_store_inferior_registers (struct target_ops
*ops
,
180 struct regcache
*regcache
, int regnum
)
182 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
185 /* GNU/Linux LWP ID's are process ID's. */
186 tid
= ptid_get_lwp (inferior_ptid
);
188 tid
= ptid_get_pid (inferior_ptid
); /* Not a threaded program. */
190 if (regnum
== -1 || amd64_native_gregset_supplies_p (gdbarch
, regnum
))
194 if (ptrace (PTRACE_GETREGS
, tid
, 0, (long) ®s
) < 0)
195 perror_with_name (_("Couldn't get registers"));
197 amd64_collect_native_gregset (regcache
, ®s
, regnum
);
199 if (ptrace (PTRACE_SETREGS
, tid
, 0, (long) ®s
) < 0)
200 perror_with_name (_("Couldn't write registers"));
206 if (regnum
== -1 || !amd64_native_gregset_supplies_p (gdbarch
, regnum
))
208 elf_fpregset_t fpregs
;
210 if (have_ptrace_getregset
)
212 char xstateregs
[X86_XSTATE_MAX_SIZE
];
215 iov
.iov_base
= xstateregs
;
216 iov
.iov_len
= sizeof (xstateregs
);
217 if (ptrace (PTRACE_GETREGSET
, tid
,
218 (unsigned int) NT_X86_XSTATE
, (long) &iov
) < 0)
219 perror_with_name (_("Couldn't get extended state status"));
221 amd64_collect_xsave (regcache
, regnum
, xstateregs
, 0);
223 if (ptrace (PTRACE_SETREGSET
, tid
,
224 (unsigned int) NT_X86_XSTATE
, (long) &iov
) < 0)
225 perror_with_name (_("Couldn't write extended state status"));
229 if (ptrace (PTRACE_GETFPREGS
, tid
, 0, (long) &fpregs
) < 0)
230 perror_with_name (_("Couldn't get floating point status"));
232 amd64_collect_fxsave (regcache
, regnum
, &fpregs
);
234 if (ptrace (PTRACE_SETFPREGS
, tid
, 0, (long) &fpregs
) < 0)
235 perror_with_name (_("Couldn't write floating point status"));
241 /* This function is called by libthread_db as part of its handling of
242 a request for a thread's local storage address. */
245 ps_get_thread_area (const struct ps_prochandle
*ph
,
246 lwpid_t lwpid
, int idx
, void **base
)
248 if (gdbarch_bfd_arch_info (target_gdbarch ())->bits_per_word
== 32)
250 unsigned int base_addr
;
253 result
= x86_linux_get_thread_area (lwpid
, (void *) (long) idx
,
257 /* Extend the value to 64 bits. Here it's assumed that
258 a "long" and a "void *" are the same. */
259 (*base
) = (void *) (long) base_addr
;
265 /* This definition comes from prctl.h, but some kernels may not
267 #ifndef PTRACE_ARCH_PRCTL
268 #define PTRACE_ARCH_PRCTL 30
270 /* FIXME: ezannoni-2003-07-09 see comment above about include
271 file order. We could be getting bogus values for these two. */
272 gdb_assert (FS
< ELF_NGREG
);
273 gdb_assert (GS
< ELF_NGREG
);
277 #ifdef HAVE_STRUCT_USER_REGS_STRUCT_FS_BASE
279 /* PTRACE_ARCH_PRCTL is obsolete since 2.6.25, where the
280 fs_base and gs_base fields of user_regs_struct can be
284 fs
= ptrace (PTRACE_PEEKUSER
, lwpid
,
285 offsetof (struct user_regs_struct
, fs_base
), 0);
293 if (ptrace (PTRACE_ARCH_PRCTL
, lwpid
, base
, ARCH_GET_FS
) == 0)
297 #ifdef HAVE_STRUCT_USER_REGS_STRUCT_GS_BASE
301 gs
= ptrace (PTRACE_PEEKUSER
, lwpid
,
302 offsetof (struct user_regs_struct
, gs_base
), 0);
310 if (ptrace (PTRACE_ARCH_PRCTL
, lwpid
, base
, ARCH_GET_GS
) == 0)
313 default: /* Should not happen. */
317 return PS_ERR
; /* ptrace failed. */
321 /* When GDB is built as a 64-bit application on linux, the
322 PTRACE_GETSIGINFO data is always presented in 64-bit layout. Since
323 debugging a 32-bit inferior with a 64-bit GDB should look the same
324 as debugging it with a 32-bit GDB, we do the 32-bit <-> 64-bit
325 conversion in-place ourselves. */
327 /* These types below (compat_*) define a siginfo type that is layout
328 compatible with the siginfo type exported by the 32-bit userspace
331 typedef int compat_int_t
;
332 typedef unsigned int compat_uptr_t
;
334 typedef int compat_time_t
;
335 typedef int compat_timer_t
;
336 typedef int compat_clock_t
;
338 struct compat_timeval
340 compat_time_t tv_sec
;
344 typedef union compat_sigval
346 compat_int_t sival_int
;
347 compat_uptr_t sival_ptr
;
350 typedef struct compat_siginfo
358 int _pad
[((128 / sizeof (int)) - 3)];
367 /* POSIX.1b timers */
372 compat_sigval_t _sigval
;
375 /* POSIX.1b signals */
380 compat_sigval_t _sigval
;
389 compat_clock_t _utime
;
390 compat_clock_t _stime
;
393 /* SIGILL, SIGFPE, SIGSEGV, SIGBUS */
408 /* For x32, clock_t in _sigchld is 64bit aligned at 4 bytes. */
409 typedef struct compat_x32_clock
413 } compat_x32_clock_t
;
415 typedef struct compat_x32_siginfo
423 int _pad
[((128 / sizeof (int)) - 3)];
432 /* POSIX.1b timers */
437 compat_sigval_t _sigval
;
440 /* POSIX.1b signals */
445 compat_sigval_t _sigval
;
454 compat_x32_clock_t _utime
;
455 compat_x32_clock_t _stime
;
458 /* SIGILL, SIGFPE, SIGSEGV, SIGBUS */
471 } compat_x32_siginfo_t
;
473 #define cpt_si_pid _sifields._kill._pid
474 #define cpt_si_uid _sifields._kill._uid
475 #define cpt_si_timerid _sifields._timer._tid
476 #define cpt_si_overrun _sifields._timer._overrun
477 #define cpt_si_status _sifields._sigchld._status
478 #define cpt_si_utime _sifields._sigchld._utime
479 #define cpt_si_stime _sifields._sigchld._stime
480 #define cpt_si_ptr _sifields._rt._sigval.sival_ptr
481 #define cpt_si_addr _sifields._sigfault._addr
482 #define cpt_si_band _sifields._sigpoll._band
483 #define cpt_si_fd _sifields._sigpoll._fd
485 /* glibc at least up to 2.3.2 doesn't have si_timerid, si_overrun.
486 In their place is si_timer1,si_timer2. */
488 #define si_timerid si_timer1
491 #define si_overrun si_timer2
495 compat_siginfo_from_siginfo (compat_siginfo_t
*to
, siginfo_t
*from
)
497 memset (to
, 0, sizeof (*to
));
499 to
->si_signo
= from
->si_signo
;
500 to
->si_errno
= from
->si_errno
;
501 to
->si_code
= from
->si_code
;
503 if (to
->si_code
== SI_TIMER
)
505 to
->cpt_si_timerid
= from
->si_timerid
;
506 to
->cpt_si_overrun
= from
->si_overrun
;
507 to
->cpt_si_ptr
= (intptr_t) from
->si_ptr
;
509 else if (to
->si_code
== SI_USER
)
511 to
->cpt_si_pid
= from
->si_pid
;
512 to
->cpt_si_uid
= from
->si_uid
;
514 else if (to
->si_code
< 0)
516 to
->cpt_si_pid
= from
->si_pid
;
517 to
->cpt_si_uid
= from
->si_uid
;
518 to
->cpt_si_ptr
= (intptr_t) from
->si_ptr
;
522 switch (to
->si_signo
)
525 to
->cpt_si_pid
= from
->si_pid
;
526 to
->cpt_si_uid
= from
->si_uid
;
527 to
->cpt_si_status
= from
->si_status
;
528 to
->cpt_si_utime
= from
->si_utime
;
529 to
->cpt_si_stime
= from
->si_stime
;
535 to
->cpt_si_addr
= (intptr_t) from
->si_addr
;
538 to
->cpt_si_band
= from
->si_band
;
539 to
->cpt_si_fd
= from
->si_fd
;
542 to
->cpt_si_pid
= from
->si_pid
;
543 to
->cpt_si_uid
= from
->si_uid
;
544 to
->cpt_si_ptr
= (intptr_t) from
->si_ptr
;
551 siginfo_from_compat_siginfo (siginfo_t
*to
, compat_siginfo_t
*from
)
553 memset (to
, 0, sizeof (*to
));
555 to
->si_signo
= from
->si_signo
;
556 to
->si_errno
= from
->si_errno
;
557 to
->si_code
= from
->si_code
;
559 if (to
->si_code
== SI_TIMER
)
561 to
->si_timerid
= from
->cpt_si_timerid
;
562 to
->si_overrun
= from
->cpt_si_overrun
;
563 to
->si_ptr
= (void *) (intptr_t) from
->cpt_si_ptr
;
565 else if (to
->si_code
== SI_USER
)
567 to
->si_pid
= from
->cpt_si_pid
;
568 to
->si_uid
= from
->cpt_si_uid
;
572 to
->si_pid
= from
->cpt_si_pid
;
573 to
->si_uid
= from
->cpt_si_uid
;
574 to
->si_ptr
= (void *) (intptr_t) from
->cpt_si_ptr
;
578 switch (to
->si_signo
)
581 to
->si_pid
= from
->cpt_si_pid
;
582 to
->si_uid
= from
->cpt_si_uid
;
583 to
->si_status
= from
->cpt_si_status
;
584 to
->si_utime
= from
->cpt_si_utime
;
585 to
->si_stime
= from
->cpt_si_stime
;
591 to
->si_addr
= (void *) (intptr_t) from
->cpt_si_addr
;
594 to
->si_band
= from
->cpt_si_band
;
595 to
->si_fd
= from
->cpt_si_fd
;
598 to
->si_pid
= from
->cpt_si_pid
;
599 to
->si_uid
= from
->cpt_si_uid
;
600 to
->si_ptr
= (void* ) (intptr_t) from
->cpt_si_ptr
;
607 compat_x32_siginfo_from_siginfo (compat_x32_siginfo_t
*to
,
610 memset (to
, 0, sizeof (*to
));
612 to
->si_signo
= from
->si_signo
;
613 to
->si_errno
= from
->si_errno
;
614 to
->si_code
= from
->si_code
;
616 if (to
->si_code
== SI_TIMER
)
618 to
->cpt_si_timerid
= from
->si_timerid
;
619 to
->cpt_si_overrun
= from
->si_overrun
;
620 to
->cpt_si_ptr
= (intptr_t) from
->si_ptr
;
622 else if (to
->si_code
== SI_USER
)
624 to
->cpt_si_pid
= from
->si_pid
;
625 to
->cpt_si_uid
= from
->si_uid
;
627 else if (to
->si_code
< 0)
629 to
->cpt_si_pid
= from
->si_pid
;
630 to
->cpt_si_uid
= from
->si_uid
;
631 to
->cpt_si_ptr
= (intptr_t) from
->si_ptr
;
635 switch (to
->si_signo
)
638 to
->cpt_si_pid
= from
->si_pid
;
639 to
->cpt_si_uid
= from
->si_uid
;
640 to
->cpt_si_status
= from
->si_status
;
641 memcpy (&to
->cpt_si_utime
, &from
->si_utime
,
642 sizeof (to
->cpt_si_utime
));
643 memcpy (&to
->cpt_si_stime
, &from
->si_stime
,
644 sizeof (to
->cpt_si_stime
));
650 to
->cpt_si_addr
= (intptr_t) from
->si_addr
;
653 to
->cpt_si_band
= from
->si_band
;
654 to
->cpt_si_fd
= from
->si_fd
;
657 to
->cpt_si_pid
= from
->si_pid
;
658 to
->cpt_si_uid
= from
->si_uid
;
659 to
->cpt_si_ptr
= (intptr_t) from
->si_ptr
;
666 siginfo_from_compat_x32_siginfo (siginfo_t
*to
,
667 compat_x32_siginfo_t
*from
)
669 memset (to
, 0, sizeof (*to
));
671 to
->si_signo
= from
->si_signo
;
672 to
->si_errno
= from
->si_errno
;
673 to
->si_code
= from
->si_code
;
675 if (to
->si_code
== SI_TIMER
)
677 to
->si_timerid
= from
->cpt_si_timerid
;
678 to
->si_overrun
= from
->cpt_si_overrun
;
679 to
->si_ptr
= (void *) (intptr_t) from
->cpt_si_ptr
;
681 else if (to
->si_code
== SI_USER
)
683 to
->si_pid
= from
->cpt_si_pid
;
684 to
->si_uid
= from
->cpt_si_uid
;
688 to
->si_pid
= from
->cpt_si_pid
;
689 to
->si_uid
= from
->cpt_si_uid
;
690 to
->si_ptr
= (void *) (intptr_t) from
->cpt_si_ptr
;
694 switch (to
->si_signo
)
697 to
->si_pid
= from
->cpt_si_pid
;
698 to
->si_uid
= from
->cpt_si_uid
;
699 to
->si_status
= from
->cpt_si_status
;
700 memcpy (&to
->si_utime
, &from
->cpt_si_utime
,
701 sizeof (to
->si_utime
));
702 memcpy (&to
->si_stime
, &from
->cpt_si_stime
,
703 sizeof (to
->si_stime
));
709 to
->si_addr
= (void *) (intptr_t) from
->cpt_si_addr
;
712 to
->si_band
= from
->cpt_si_band
;
713 to
->si_fd
= from
->cpt_si_fd
;
716 to
->si_pid
= from
->cpt_si_pid
;
717 to
->si_uid
= from
->cpt_si_uid
;
718 to
->si_ptr
= (void* ) (intptr_t) from
->cpt_si_ptr
;
724 /* Convert a native/host siginfo object, into/from the siginfo in the
725 layout of the inferiors' architecture. Returns true if any
726 conversion was done; false otherwise. If DIRECTION is 1, then copy
727 from INF to NATIVE. If DIRECTION is 0, copy from NATIVE to
731 amd64_linux_siginfo_fixup (siginfo_t
*native
, gdb_byte
*inf
, int direction
)
733 struct gdbarch
*gdbarch
= get_frame_arch (get_current_frame ());
735 /* Is the inferior 32-bit? If so, then do fixup the siginfo
737 if (gdbarch_bfd_arch_info (gdbarch
)->bits_per_word
== 32)
739 gdb_assert (sizeof (siginfo_t
) == sizeof (compat_siginfo_t
));
742 compat_siginfo_from_siginfo ((struct compat_siginfo
*) inf
, native
);
744 siginfo_from_compat_siginfo (native
, (struct compat_siginfo
*) inf
);
748 /* No fixup for native x32 GDB. */
749 else if (gdbarch_addr_bit (gdbarch
) == 32 && sizeof (void *) == 8)
751 gdb_assert (sizeof (siginfo_t
) == sizeof (compat_x32_siginfo_t
));
754 compat_x32_siginfo_from_siginfo ((struct compat_x32_siginfo
*) inf
,
757 siginfo_from_compat_x32_siginfo (native
,
758 (struct compat_x32_siginfo
*) inf
);
767 /* Provide a prototype to silence -Wmissing-prototypes. */
768 void _initialize_amd64_linux_nat (void);
771 _initialize_amd64_linux_nat (void)
773 struct target_ops
*t
;
775 amd64_native_gregset32_reg_offset
= amd64_linux_gregset32_reg_offset
;
776 amd64_native_gregset32_num_regs
= I386_LINUX_NUM_REGS
;
777 amd64_native_gregset64_reg_offset
= amd64_linux_gregset_reg_offset
;
778 amd64_native_gregset64_num_regs
= AMD64_LINUX_NUM_REGS
;
780 gdb_assert (ARRAY_SIZE (amd64_linux_gregset32_reg_offset
)
781 == amd64_native_gregset32_num_regs
);
783 /* Create a generic x86 GNU/Linux target. */
784 t
= x86_linux_create_target ();
786 /* Add our register access methods. */
787 t
->to_fetch_registers
= amd64_linux_fetch_inferior_registers
;
788 t
->to_store_registers
= amd64_linux_store_inferior_registers
;
790 /* Add the target. */
791 x86_linux_add_target (t
);
793 /* Add our siginfo layout converter. */
794 linux_nat_set_siginfo_fixup (t
, amd64_linux_siginfo_fixup
);