1 /* Native-dependent code for GNU/Linux x86-64.
3 Copyright (C) 2001-2012 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"
29 #include "gdb_assert.h"
30 #include "gdb_string.h"
31 #include "elf/common.h"
33 #include <sys/ptrace.h>
34 #include <sys/debugreg.h>
35 #include <sys/syscall.h>
36 #include <sys/procfs.h>
37 #include <asm/prctl.h>
38 /* FIXME ezannoni-2003-07-09: we need <sys/reg.h> to be included after
39 <asm/ptrace.h> because the latter redefines FS and GS for no apparent
40 reason, and those definitions don't match the ones that libpthread_db
41 uses, which come from <sys/reg.h>. */
42 /* ezannoni-2003-07-09: I think this is fixed. The extraneous defs have
43 been removed from ptrace.h in the kernel. However, better safe than
45 #include <asm/ptrace.h>
47 #include "gdb_proc_service.h"
49 /* Prototypes for supply_gregset etc. */
52 #include "amd64-tdep.h"
53 #include "i386-linux-tdep.h"
54 #include "amd64-nat.h"
56 #include "i386-xstate.h"
58 #ifndef PTRACE_GETREGSET
59 #define PTRACE_GETREGSET 0x4204
62 #ifndef PTRACE_SETREGSET
63 #define PTRACE_SETREGSET 0x4205
66 /* Per-thread arch-specific data we want to keep. */
70 /* Non-zero if our copy differs from what's recorded in the thread. */
71 int debug_registers_changed
;
74 /* Does the current host support PTRACE_GETREGSET? */
75 static int have_ptrace_getregset
= -1;
77 /* Mapping between the general-purpose registers in GNU/Linux x86-64
78 `struct user' format and GDB's register cache layout for GNU/Linux
81 Note that most GNU/Linux x86-64 registers are 64-bit, while the
82 GNU/Linux i386 registers are all 32-bit, but since we're
83 little-endian we get away with that. */
85 /* From <sys/reg.h> on GNU/Linux i386. */
86 static int amd64_linux_gregset32_reg_offset
[] =
88 RAX
* 8, RCX
* 8, /* %eax, %ecx */
89 RDX
* 8, RBX
* 8, /* %edx, %ebx */
90 RSP
* 8, RBP
* 8, /* %esp, %ebp */
91 RSI
* 8, RDI
* 8, /* %esi, %edi */
92 RIP
* 8, EFLAGS
* 8, /* %eip, %eflags */
93 CS
* 8, SS
* 8, /* %cs, %ss */
94 DS
* 8, ES
* 8, /* %ds, %es */
95 FS
* 8, GS
* 8, /* %fs, %gs */
96 -1, -1, -1, -1, -1, -1, -1, -1,
97 -1, -1, -1, -1, -1, -1, -1, -1,
98 -1, -1, -1, -1, -1, -1, -1, -1, -1,
99 -1, -1, -1, -1, -1, -1, -1, -1,
100 ORIG_RAX
* 8 /* "orig_eax" */
104 /* Transfering the general-purpose registers between GDB, inferiors
107 /* Fill GDB's register cache with the general-purpose register values
111 supply_gregset (struct regcache
*regcache
, const elf_gregset_t
*gregsetp
)
113 amd64_supply_native_gregset (regcache
, gregsetp
, -1);
116 /* Fill register REGNUM (if it is a general-purpose register) in
117 *GREGSETP with the value in GDB's register cache. If REGNUM is -1,
118 do this for all registers. */
121 fill_gregset (const struct regcache
*regcache
,
122 elf_gregset_t
*gregsetp
, int regnum
)
124 amd64_collect_native_gregset (regcache
, gregsetp
, regnum
);
127 /* Transfering floating-point registers between GDB, inferiors and cores. */
129 /* Fill GDB's register cache with the floating-point and SSE register
130 values in *FPREGSETP. */
133 supply_fpregset (struct regcache
*regcache
, const elf_fpregset_t
*fpregsetp
)
135 amd64_supply_fxsave (regcache
, -1, fpregsetp
);
138 /* Fill register REGNUM (if it is a floating-point or SSE register) in
139 *FPREGSETP with the value in GDB's register cache. If REGNUM is
140 -1, do this for all registers. */
143 fill_fpregset (const struct regcache
*regcache
,
144 elf_fpregset_t
*fpregsetp
, int regnum
)
146 amd64_collect_fxsave (regcache
, regnum
, fpregsetp
);
150 /* Transferring arbitrary registers between GDB and inferior. */
152 /* Fetch register REGNUM from the child process. If REGNUM is -1, do
153 this for all registers (including the floating point and SSE
157 amd64_linux_fetch_inferior_registers (struct target_ops
*ops
,
158 struct regcache
*regcache
, int regnum
)
160 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
163 /* GNU/Linux LWP ID's are process ID's. */
164 tid
= TIDGET (inferior_ptid
);
166 tid
= PIDGET (inferior_ptid
); /* Not a threaded program. */
168 if (regnum
== -1 || amd64_native_gregset_supplies_p (gdbarch
, regnum
))
172 if (ptrace (PTRACE_GETREGS
, tid
, 0, (long) ®s
) < 0)
173 perror_with_name (_("Couldn't get registers"));
175 amd64_supply_native_gregset (regcache
, ®s
, -1);
180 if (regnum
== -1 || !amd64_native_gregset_supplies_p (gdbarch
, regnum
))
182 elf_fpregset_t fpregs
;
184 if (have_ptrace_getregset
)
186 char xstateregs
[I386_XSTATE_MAX_SIZE
];
189 iov
.iov_base
= xstateregs
;
190 iov
.iov_len
= sizeof (xstateregs
);
191 if (ptrace (PTRACE_GETREGSET
, tid
,
192 (unsigned int) NT_X86_XSTATE
, (long) &iov
) < 0)
193 perror_with_name (_("Couldn't get extended state status"));
195 amd64_supply_xsave (regcache
, -1, xstateregs
);
199 if (ptrace (PTRACE_GETFPREGS
, tid
, 0, (long) &fpregs
) < 0)
200 perror_with_name (_("Couldn't get floating point status"));
202 amd64_supply_fxsave (regcache
, -1, &fpregs
);
207 /* Store register REGNUM back into the child process. If REGNUM is
208 -1, do this for all registers (including the floating-point and SSE
212 amd64_linux_store_inferior_registers (struct target_ops
*ops
,
213 struct regcache
*regcache
, int regnum
)
215 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
218 /* GNU/Linux LWP ID's are process ID's. */
219 tid
= TIDGET (inferior_ptid
);
221 tid
= PIDGET (inferior_ptid
); /* Not a threaded program. */
223 if (regnum
== -1 || amd64_native_gregset_supplies_p (gdbarch
, regnum
))
227 if (ptrace (PTRACE_GETREGS
, tid
, 0, (long) ®s
) < 0)
228 perror_with_name (_("Couldn't get registers"));
230 amd64_collect_native_gregset (regcache
, ®s
, regnum
);
232 if (ptrace (PTRACE_SETREGS
, tid
, 0, (long) ®s
) < 0)
233 perror_with_name (_("Couldn't write registers"));
239 if (regnum
== -1 || !amd64_native_gregset_supplies_p (gdbarch
, regnum
))
241 elf_fpregset_t fpregs
;
243 if (have_ptrace_getregset
)
245 char xstateregs
[I386_XSTATE_MAX_SIZE
];
248 iov
.iov_base
= xstateregs
;
249 iov
.iov_len
= sizeof (xstateregs
);
250 if (ptrace (PTRACE_GETREGSET
, tid
,
251 (unsigned int) NT_X86_XSTATE
, (long) &iov
) < 0)
252 perror_with_name (_("Couldn't get extended state status"));
254 amd64_collect_xsave (regcache
, regnum
, xstateregs
, 0);
256 if (ptrace (PTRACE_SETREGSET
, tid
,
257 (unsigned int) NT_X86_XSTATE
, (long) &iov
) < 0)
258 perror_with_name (_("Couldn't write extended state status"));
262 if (ptrace (PTRACE_GETFPREGS
, tid
, 0, (long) &fpregs
) < 0)
263 perror_with_name (_("Couldn't get floating point status"));
265 amd64_collect_fxsave (regcache
, regnum
, &fpregs
);
267 if (ptrace (PTRACE_SETFPREGS
, tid
, 0, (long) &fpregs
) < 0)
268 perror_with_name (_("Couldn't write floating point status"));
273 /* Support for debug registers. */
276 amd64_linux_dr_get (ptid_t ptid
, int regnum
)
286 value
= ptrace (PTRACE_PEEKUSER
, tid
,
287 offsetof (struct user
, u_debugreg
[regnum
]), 0);
289 perror_with_name (_("Couldn't read debug register"));
294 /* Set debug register REGNUM to VALUE in only the one LWP of PTID. */
297 amd64_linux_dr_set (ptid_t ptid
, int regnum
, unsigned long value
)
306 ptrace (PTRACE_POKEUSER
, tid
,
307 offsetof (struct user
, u_debugreg
[regnum
]), value
);
309 perror_with_name (_("Couldn't write debug register"));
312 /* Return the inferior's debug register REGNUM. */
315 amd64_linux_dr_get_addr (int regnum
)
317 /* DR6 and DR7 are retrieved with some other way. */
318 gdb_assert (DR_FIRSTADDR
<= regnum
&& regnum
<= DR_LASTADDR
);
320 return amd64_linux_dr_get (inferior_ptid
, regnum
);
323 /* Return the inferior's DR7 debug control register. */
326 amd64_linux_dr_get_control (void)
328 return amd64_linux_dr_get (inferior_ptid
, DR_CONTROL
);
331 /* Get DR_STATUS from only the one LWP of INFERIOR_PTID. */
334 amd64_linux_dr_get_status (void)
336 return amd64_linux_dr_get (inferior_ptid
, DR_STATUS
);
339 /* Callback for linux_nat_iterate_watchpoint_lwps. Update the debug registers
343 update_debug_registers_callback (struct lwp_info
*lwp
, void *arg
)
345 if (lwp
->arch_private
== NULL
)
346 lwp
->arch_private
= XCNEW (struct arch_lwp_info
);
348 /* The actual update is done later just before resuming the lwp, we
349 just mark that the registers need updating. */
350 lwp
->arch_private
->debug_registers_changed
= 1;
352 /* If the lwp isn't stopped, force it to momentarily pause, so we
353 can update its debug registers. */
355 linux_stop_lwp (lwp
);
357 /* Continue the iteration. */
361 /* Set DR_CONTROL to CONTROL in all LWPs of the current inferior. */
364 amd64_linux_dr_set_control (unsigned long control
)
366 linux_nat_iterate_watchpoint_lwps (update_debug_registers_callback
, NULL
);
369 /* Set address REGNUM (zero based) to ADDR in all LWPs of the current
373 amd64_linux_dr_set_addr (int regnum
, CORE_ADDR addr
)
375 gdb_assert (regnum
>= 0 && regnum
<= DR_LASTADDR
- DR_FIRSTADDR
);
377 linux_nat_iterate_watchpoint_lwps (update_debug_registers_callback
, NULL
);
380 /* Called when resuming a thread.
381 If the debug regs have changed, update the thread's copies. */
384 amd64_linux_prepare_to_resume (struct lwp_info
*lwp
)
386 int clear_status
= 0;
388 /* NULL means this is the main thread still going through the shell,
389 or, no watchpoint has been set yet. In that case, there's
391 if (lwp
->arch_private
== NULL
)
394 if (lwp
->arch_private
->debug_registers_changed
)
396 struct i386_debug_reg_state
*state
= i386_debug_reg_state ();
399 /* On Linux kernel before 2.6.33 commit
400 72f674d203cd230426437cdcf7dd6f681dad8b0d
401 if you enable a breakpoint by the DR_CONTROL bits you need to have
402 already written the corresponding DR_FIRSTADDR...DR_LASTADDR registers.
404 Ensure DR_CONTROL gets written as the very last register here. */
406 for (i
= DR_FIRSTADDR
; i
<= DR_LASTADDR
; i
++)
407 if (state
->dr_ref_count
[i
] > 0)
409 amd64_linux_dr_set (lwp
->ptid
, i
, state
->dr_mirror
[i
]);
411 /* If we're setting a watchpoint, any change the inferior
412 had done itself to the debug registers needs to be
413 discarded, otherwise, i386_stopped_data_address can get
418 amd64_linux_dr_set (lwp
->ptid
, DR_CONTROL
, state
->dr_control_mirror
);
420 lwp
->arch_private
->debug_registers_changed
= 0;
423 if (clear_status
|| lwp
->stopped_by_watchpoint
)
424 amd64_linux_dr_set (lwp
->ptid
, DR_STATUS
, 0);
428 amd64_linux_new_thread (struct lwp_info
*lp
)
430 struct arch_lwp_info
*info
= XCNEW (struct arch_lwp_info
);
432 info
->debug_registers_changed
= 1;
434 lp
->arch_private
= info
;
438 /* This function is called by libthread_db as part of its handling of
439 a request for a thread's local storage address. */
442 ps_get_thread_area (const struct ps_prochandle
*ph
,
443 lwpid_t lwpid
, int idx
, void **base
)
445 if (gdbarch_bfd_arch_info (target_gdbarch
)->bits_per_word
== 32)
447 /* The full structure is found in <asm-i386/ldt.h>. The second
448 integer is the LDT's base_address and that is used to locate
449 the thread's local storage. See i386-linux-nat.c more
451 unsigned int desc
[4];
453 /* This code assumes that "int" is 32 bits and that
454 GET_THREAD_AREA returns no more than 4 int values. */
455 gdb_assert (sizeof (int) == 4);
456 #ifndef PTRACE_GET_THREAD_AREA
457 #define PTRACE_GET_THREAD_AREA 25
459 if (ptrace (PTRACE_GET_THREAD_AREA
,
460 lwpid
, (void *) (long) idx
, (unsigned long) &desc
) < 0)
463 /* Extend the value to 64 bits. Here it's assumed that a "long"
464 and a "void *" are the same. */
465 (*base
) = (void *) (long) desc
[1];
470 /* This definition comes from prctl.h, but some kernels may not
472 #ifndef PTRACE_ARCH_PRCTL
473 #define PTRACE_ARCH_PRCTL 30
475 /* FIXME: ezannoni-2003-07-09 see comment above about include
476 file order. We could be getting bogus values for these two. */
477 gdb_assert (FS
< ELF_NGREG
);
478 gdb_assert (GS
< ELF_NGREG
);
482 if (ptrace (PTRACE_ARCH_PRCTL
, lwpid
, base
, ARCH_GET_FS
) == 0)
486 if (ptrace (PTRACE_ARCH_PRCTL
, lwpid
, base
, ARCH_GET_GS
) == 0)
489 default: /* Should not happen. */
493 return PS_ERR
; /* ptrace failed. */
497 static void (*super_post_startup_inferior
) (ptid_t ptid
);
500 amd64_linux_child_post_startup_inferior (ptid_t ptid
)
502 i386_cleanup_dregs ();
503 super_post_startup_inferior (ptid
);
507 /* When GDB is built as a 64-bit application on linux, the
508 PTRACE_GETSIGINFO data is always presented in 64-bit layout. Since
509 debugging a 32-bit inferior with a 64-bit GDB should look the same
510 as debugging it with a 32-bit GDB, we do the 32-bit <-> 64-bit
511 conversion in-place ourselves. */
513 /* These types below (compat_*) define a siginfo type that is layout
514 compatible with the siginfo type exported by the 32-bit userspace
517 typedef int compat_int_t
;
518 typedef unsigned int compat_uptr_t
;
520 typedef int compat_time_t
;
521 typedef int compat_timer_t
;
522 typedef int compat_clock_t
;
524 struct compat_timeval
526 compat_time_t tv_sec
;
530 typedef union compat_sigval
532 compat_int_t sival_int
;
533 compat_uptr_t sival_ptr
;
536 typedef struct compat_siginfo
544 int _pad
[((128 / sizeof (int)) - 3)];
553 /* POSIX.1b timers */
558 compat_sigval_t _sigval
;
561 /* POSIX.1b signals */
566 compat_sigval_t _sigval
;
575 compat_clock_t _utime
;
576 compat_clock_t _stime
;
579 /* SIGILL, SIGFPE, SIGSEGV, SIGBUS */
594 /* For x32, clock_t in _sigchld is 64bit aligned at 4 bytes. */
595 typedef struct compat_x32_clock
599 } compat_x32_clock_t
;
601 typedef struct compat_x32_siginfo
609 int _pad
[((128 / sizeof (int)) - 3)];
618 /* POSIX.1b timers */
623 compat_sigval_t _sigval
;
626 /* POSIX.1b signals */
631 compat_sigval_t _sigval
;
640 compat_x32_clock_t _utime
;
641 compat_x32_clock_t _stime
;
644 /* SIGILL, SIGFPE, SIGSEGV, SIGBUS */
657 } compat_x32_siginfo_t
;
659 #define cpt_si_pid _sifields._kill._pid
660 #define cpt_si_uid _sifields._kill._uid
661 #define cpt_si_timerid _sifields._timer._tid
662 #define cpt_si_overrun _sifields._timer._overrun
663 #define cpt_si_status _sifields._sigchld._status
664 #define cpt_si_utime _sifields._sigchld._utime
665 #define cpt_si_stime _sifields._sigchld._stime
666 #define cpt_si_ptr _sifields._rt._sigval.sival_ptr
667 #define cpt_si_addr _sifields._sigfault._addr
668 #define cpt_si_band _sifields._sigpoll._band
669 #define cpt_si_fd _sifields._sigpoll._fd
671 /* glibc at least up to 2.3.2 doesn't have si_timerid, si_overrun.
672 In their place is si_timer1,si_timer2. */
674 #define si_timerid si_timer1
677 #define si_overrun si_timer2
681 compat_siginfo_from_siginfo (compat_siginfo_t
*to
, siginfo_t
*from
)
683 memset (to
, 0, sizeof (*to
));
685 to
->si_signo
= from
->si_signo
;
686 to
->si_errno
= from
->si_errno
;
687 to
->si_code
= from
->si_code
;
689 if (to
->si_code
== SI_TIMER
)
691 to
->cpt_si_timerid
= from
->si_timerid
;
692 to
->cpt_si_overrun
= from
->si_overrun
;
693 to
->cpt_si_ptr
= (intptr_t) from
->si_ptr
;
695 else if (to
->si_code
== SI_USER
)
697 to
->cpt_si_pid
= from
->si_pid
;
698 to
->cpt_si_uid
= from
->si_uid
;
700 else if (to
->si_code
< 0)
702 to
->cpt_si_pid
= from
->si_pid
;
703 to
->cpt_si_uid
= from
->si_uid
;
704 to
->cpt_si_ptr
= (intptr_t) from
->si_ptr
;
708 switch (to
->si_signo
)
711 to
->cpt_si_pid
= from
->si_pid
;
712 to
->cpt_si_uid
= from
->si_uid
;
713 to
->cpt_si_status
= from
->si_status
;
714 to
->cpt_si_utime
= from
->si_utime
;
715 to
->cpt_si_stime
= from
->si_stime
;
721 to
->cpt_si_addr
= (intptr_t) from
->si_addr
;
724 to
->cpt_si_band
= from
->si_band
;
725 to
->cpt_si_fd
= from
->si_fd
;
728 to
->cpt_si_pid
= from
->si_pid
;
729 to
->cpt_si_uid
= from
->si_uid
;
730 to
->cpt_si_ptr
= (intptr_t) from
->si_ptr
;
737 siginfo_from_compat_siginfo (siginfo_t
*to
, compat_siginfo_t
*from
)
739 memset (to
, 0, sizeof (*to
));
741 to
->si_signo
= from
->si_signo
;
742 to
->si_errno
= from
->si_errno
;
743 to
->si_code
= from
->si_code
;
745 if (to
->si_code
== SI_TIMER
)
747 to
->si_timerid
= from
->cpt_si_timerid
;
748 to
->si_overrun
= from
->cpt_si_overrun
;
749 to
->si_ptr
= (void *) (intptr_t) from
->cpt_si_ptr
;
751 else if (to
->si_code
== SI_USER
)
753 to
->si_pid
= from
->cpt_si_pid
;
754 to
->si_uid
= from
->cpt_si_uid
;
758 to
->si_pid
= from
->cpt_si_pid
;
759 to
->si_uid
= from
->cpt_si_uid
;
760 to
->si_ptr
= (void *) (intptr_t) from
->cpt_si_ptr
;
764 switch (to
->si_signo
)
767 to
->si_pid
= from
->cpt_si_pid
;
768 to
->si_uid
= from
->cpt_si_uid
;
769 to
->si_status
= from
->cpt_si_status
;
770 to
->si_utime
= from
->cpt_si_utime
;
771 to
->si_stime
= from
->cpt_si_stime
;
777 to
->si_addr
= (void *) (intptr_t) from
->cpt_si_addr
;
780 to
->si_band
= from
->cpt_si_band
;
781 to
->si_fd
= from
->cpt_si_fd
;
784 to
->si_pid
= from
->cpt_si_pid
;
785 to
->si_uid
= from
->cpt_si_uid
;
786 to
->si_ptr
= (void* ) (intptr_t) from
->cpt_si_ptr
;
793 compat_x32_siginfo_from_siginfo (compat_x32_siginfo_t
*to
,
796 memset (to
, 0, sizeof (*to
));
798 to
->si_signo
= from
->si_signo
;
799 to
->si_errno
= from
->si_errno
;
800 to
->si_code
= from
->si_code
;
802 if (to
->si_code
== SI_TIMER
)
804 to
->cpt_si_timerid
= from
->si_timerid
;
805 to
->cpt_si_overrun
= from
->si_overrun
;
806 to
->cpt_si_ptr
= (intptr_t) from
->si_ptr
;
808 else if (to
->si_code
== SI_USER
)
810 to
->cpt_si_pid
= from
->si_pid
;
811 to
->cpt_si_uid
= from
->si_uid
;
813 else if (to
->si_code
< 0)
815 to
->cpt_si_pid
= from
->si_pid
;
816 to
->cpt_si_uid
= from
->si_uid
;
817 to
->cpt_si_ptr
= (intptr_t) from
->si_ptr
;
821 switch (to
->si_signo
)
824 to
->cpt_si_pid
= from
->si_pid
;
825 to
->cpt_si_uid
= from
->si_uid
;
826 to
->cpt_si_status
= from
->si_status
;
827 memcpy (&to
->cpt_si_utime
, &from
->si_utime
,
828 sizeof (to
->cpt_si_utime
));
829 memcpy (&to
->cpt_si_stime
, &from
->si_stime
,
830 sizeof (to
->cpt_si_stime
));
836 to
->cpt_si_addr
= (intptr_t) from
->si_addr
;
839 to
->cpt_si_band
= from
->si_band
;
840 to
->cpt_si_fd
= from
->si_fd
;
843 to
->cpt_si_pid
= from
->si_pid
;
844 to
->cpt_si_uid
= from
->si_uid
;
845 to
->cpt_si_ptr
= (intptr_t) from
->si_ptr
;
852 siginfo_from_compat_x32_siginfo (siginfo_t
*to
,
853 compat_x32_siginfo_t
*from
)
855 memset (to
, 0, sizeof (*to
));
857 to
->si_signo
= from
->si_signo
;
858 to
->si_errno
= from
->si_errno
;
859 to
->si_code
= from
->si_code
;
861 if (to
->si_code
== SI_TIMER
)
863 to
->si_timerid
= from
->cpt_si_timerid
;
864 to
->si_overrun
= from
->cpt_si_overrun
;
865 to
->si_ptr
= (void *) (intptr_t) from
->cpt_si_ptr
;
867 else if (to
->si_code
== SI_USER
)
869 to
->si_pid
= from
->cpt_si_pid
;
870 to
->si_uid
= from
->cpt_si_uid
;
874 to
->si_pid
= from
->cpt_si_pid
;
875 to
->si_uid
= from
->cpt_si_uid
;
876 to
->si_ptr
= (void *) (intptr_t) from
->cpt_si_ptr
;
880 switch (to
->si_signo
)
883 to
->si_pid
= from
->cpt_si_pid
;
884 to
->si_uid
= from
->cpt_si_uid
;
885 to
->si_status
= from
->cpt_si_status
;
886 memcpy (&to
->si_utime
, &from
->cpt_si_utime
,
887 sizeof (to
->si_utime
));
888 memcpy (&to
->si_stime
, &from
->cpt_si_stime
,
889 sizeof (to
->si_stime
));
895 to
->si_addr
= (void *) (intptr_t) from
->cpt_si_addr
;
898 to
->si_band
= from
->cpt_si_band
;
899 to
->si_fd
= from
->cpt_si_fd
;
902 to
->si_pid
= from
->cpt_si_pid
;
903 to
->si_uid
= from
->cpt_si_uid
;
904 to
->si_ptr
= (void* ) (intptr_t) from
->cpt_si_ptr
;
910 /* Convert a native/host siginfo object, into/from the siginfo in the
911 layout of the inferiors' architecture. Returns true if any
912 conversion was done; false otherwise. If DIRECTION is 1, then copy
913 from INF to NATIVE. If DIRECTION is 0, copy from NATIVE to
917 amd64_linux_siginfo_fixup (siginfo_t
*native
, gdb_byte
*inf
, int direction
)
919 struct gdbarch
*gdbarch
= get_frame_arch (get_current_frame ());
921 /* Is the inferior 32-bit? If so, then do fixup the siginfo
923 if (gdbarch_bfd_arch_info (gdbarch
)->bits_per_word
== 32)
925 gdb_assert (sizeof (siginfo_t
) == sizeof (compat_siginfo_t
));
928 compat_siginfo_from_siginfo ((struct compat_siginfo
*) inf
, native
);
930 siginfo_from_compat_siginfo (native
, (struct compat_siginfo
*) inf
);
934 /* No fixup for native x32 GDB. */
935 else if (gdbarch_addr_bit (gdbarch
) == 32 && sizeof (void *) == 8)
937 gdb_assert (sizeof (siginfo_t
) == sizeof (compat_x32_siginfo_t
));
940 compat_x32_siginfo_from_siginfo ((struct compat_x32_siginfo
*) inf
,
943 siginfo_from_compat_x32_siginfo (native
,
944 (struct compat_x32_siginfo
*) inf
);
952 /* Get Linux/x86 target description from running target.
954 Value of CS segment register:
955 1. 64bit process: 0x33.
956 2. 32bit process: 0x23.
958 Value of DS segment register:
959 1. LP64 process: 0x0.
960 2. X32 process: 0x2b.
963 #define AMD64_LINUX_USER64_CS 0x33
964 #define AMD64_LINUX_X32_DS 0x2b
966 static const struct target_desc
*
967 amd64_linux_read_description (struct target_ops
*ops
)
974 static uint64_t xcr0
;
976 /* GNU/Linux LWP ID's are process ID's. */
977 tid
= TIDGET (inferior_ptid
);
979 tid
= PIDGET (inferior_ptid
); /* Not a threaded program. */
981 /* Get CS register. */
983 cs
= ptrace (PTRACE_PEEKUSER
, tid
,
984 offsetof (struct user_regs_struct
, cs
), 0);
986 perror_with_name (_("Couldn't get CS register"));
988 is_64bit
= cs
== AMD64_LINUX_USER64_CS
;
990 /* Get DS register. */
992 ds
= ptrace (PTRACE_PEEKUSER
, tid
,
993 offsetof (struct user_regs_struct
, ds
), 0);
995 perror_with_name (_("Couldn't get DS register"));
997 is_x32
= ds
== AMD64_LINUX_X32_DS
;
999 if (sizeof (void *) == 4 && is_64bit
&& !is_x32
)
1000 error (_("Can't debug 64-bit process with 32-bit GDB"));
1002 if (have_ptrace_getregset
== -1)
1004 uint64_t xstateregs
[(I386_XSTATE_SSE_SIZE
/ sizeof (uint64_t))];
1007 iov
.iov_base
= xstateregs
;
1008 iov
.iov_len
= sizeof (xstateregs
);
1010 /* Check if PTRACE_GETREGSET works. */
1011 if (ptrace (PTRACE_GETREGSET
, tid
,
1012 (unsigned int) NT_X86_XSTATE
, (long) &iov
) < 0)
1013 have_ptrace_getregset
= 0;
1016 have_ptrace_getregset
= 1;
1018 /* Get XCR0 from XSAVE extended state. */
1019 xcr0
= xstateregs
[(I386_LINUX_XSAVE_XCR0_OFFSET
1020 / sizeof (uint64_t))];
1024 /* Check the native XCR0 only if PTRACE_GETREGSET is available. */
1025 if (have_ptrace_getregset
1026 && (xcr0
& I386_XSTATE_AVX_MASK
) == I386_XSTATE_AVX_MASK
)
1031 return tdesc_x32_avx_linux
;
1033 return tdesc_amd64_avx_linux
;
1036 return tdesc_i386_avx_linux
;
1043 return tdesc_x32_linux
;
1045 return tdesc_amd64_linux
;
1048 return tdesc_i386_linux
;
1052 /* Provide a prototype to silence -Wmissing-prototypes. */
1053 void _initialize_amd64_linux_nat (void);
1056 _initialize_amd64_linux_nat (void)
1058 struct target_ops
*t
;
1060 amd64_native_gregset32_reg_offset
= amd64_linux_gregset32_reg_offset
;
1061 amd64_native_gregset32_num_regs
= I386_LINUX_NUM_REGS
;
1062 amd64_native_gregset64_reg_offset
= amd64_linux_gregset_reg_offset
;
1063 amd64_native_gregset64_num_regs
= AMD64_LINUX_NUM_REGS
;
1065 gdb_assert (ARRAY_SIZE (amd64_linux_gregset32_reg_offset
)
1066 == amd64_native_gregset32_num_regs
);
1068 /* Fill in the generic GNU/Linux methods. */
1069 t
= linux_target ();
1071 i386_use_watchpoints (t
);
1073 i386_dr_low
.set_control
= amd64_linux_dr_set_control
;
1074 i386_dr_low
.set_addr
= amd64_linux_dr_set_addr
;
1075 i386_dr_low
.get_addr
= amd64_linux_dr_get_addr
;
1076 i386_dr_low
.get_status
= amd64_linux_dr_get_status
;
1077 i386_dr_low
.get_control
= amd64_linux_dr_get_control
;
1078 i386_set_debug_register_length (8);
1080 /* Override the GNU/Linux inferior startup hook. */
1081 super_post_startup_inferior
= t
->to_post_startup_inferior
;
1082 t
->to_post_startup_inferior
= amd64_linux_child_post_startup_inferior
;
1084 /* Add our register access methods. */
1085 t
->to_fetch_registers
= amd64_linux_fetch_inferior_registers
;
1086 t
->to_store_registers
= amd64_linux_store_inferior_registers
;
1088 t
->to_read_description
= amd64_linux_read_description
;
1090 /* Register the target. */
1091 linux_nat_add_target (t
);
1092 linux_nat_set_new_thread (t
, amd64_linux_new_thread
);
1093 linux_nat_set_siginfo_fixup (t
, amd64_linux_siginfo_fixup
);
1094 linux_nat_set_prepare_to_resume (t
, amd64_linux_prepare_to_resume
);