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>
38 #include <asm/prctl.h>
39 /* FIXME ezannoni-2003-07-09: we need <sys/reg.h> to be included after
40 <asm/ptrace.h> because the latter redefines FS and GS for no apparent
41 reason, and those definitions don't match the ones that libpthread_db
42 uses, which come from <sys/reg.h>. */
43 /* ezannoni-2003-07-09: I think this is fixed. The extraneous defs have
44 been removed from ptrace.h in the kernel. However, better safe than
46 #include <asm/ptrace.h>
48 #include "gdb_proc_service.h"
50 /* Prototypes for supply_gregset etc. */
53 #include "amd64-tdep.h"
54 #include "i386-linux-tdep.h"
55 #include "amd64-nat.h"
57 #include "i386-xstate.h"
59 #ifndef PTRACE_GETREGSET
60 #define PTRACE_GETREGSET 0x4204
63 #ifndef PTRACE_SETREGSET
64 #define PTRACE_SETREGSET 0x4205
67 /* Per-thread arch-specific data we want to keep. */
71 /* Non-zero if our copy differs from what's recorded in the thread. */
72 int debug_registers_changed
;
75 /* Does the current host support PTRACE_GETREGSET? */
76 static int have_ptrace_getregset
= -1;
78 /* Mapping between the general-purpose registers in GNU/Linux x86-64
79 `struct user' format and GDB's register cache layout for GNU/Linux
82 Note that most GNU/Linux x86-64 registers are 64-bit, while the
83 GNU/Linux i386 registers are all 32-bit, but since we're
84 little-endian we get away with that. */
86 /* From <sys/reg.h> on GNU/Linux i386. */
87 static int amd64_linux_gregset32_reg_offset
[] =
89 RAX
* 8, RCX
* 8, /* %eax, %ecx */
90 RDX
* 8, RBX
* 8, /* %edx, %ebx */
91 RSP
* 8, RBP
* 8, /* %esp, %ebp */
92 RSI
* 8, RDI
* 8, /* %esi, %edi */
93 RIP
* 8, EFLAGS
* 8, /* %eip, %eflags */
94 CS
* 8, SS
* 8, /* %cs, %ss */
95 DS
* 8, ES
* 8, /* %ds, %es */
96 FS
* 8, GS
* 8, /* %fs, %gs */
97 -1, -1, -1, -1, -1, -1, -1, -1,
98 -1, -1, -1, -1, -1, -1, -1, -1,
99 -1, -1, -1, -1, -1, -1, -1, -1, -1,
100 -1, -1, -1, -1, -1, -1, -1, -1,
101 ORIG_RAX
* 8 /* "orig_eax" */
105 /* Transfering the general-purpose registers between GDB, inferiors
108 /* Fill GDB's register cache with the general-purpose register values
112 supply_gregset (struct regcache
*regcache
, const elf_gregset_t
*gregsetp
)
114 amd64_supply_native_gregset (regcache
, gregsetp
, -1);
117 /* Fill register REGNUM (if it is a general-purpose register) in
118 *GREGSETP with the value in GDB's register cache. If REGNUM is -1,
119 do this for all registers. */
122 fill_gregset (const struct regcache
*regcache
,
123 elf_gregset_t
*gregsetp
, int regnum
)
125 amd64_collect_native_gregset (regcache
, gregsetp
, regnum
);
128 /* Transfering floating-point registers between GDB, inferiors and cores. */
130 /* Fill GDB's register cache with the floating-point and SSE register
131 values in *FPREGSETP. */
134 supply_fpregset (struct regcache
*regcache
, const elf_fpregset_t
*fpregsetp
)
136 amd64_supply_fxsave (regcache
, -1, fpregsetp
);
139 /* Fill register REGNUM (if it is a floating-point or SSE register) in
140 *FPREGSETP with the value in GDB's register cache. If REGNUM is
141 -1, do this for all registers. */
144 fill_fpregset (const struct regcache
*regcache
,
145 elf_fpregset_t
*fpregsetp
, int regnum
)
147 amd64_collect_fxsave (regcache
, regnum
, fpregsetp
);
151 /* Transferring arbitrary registers between GDB and inferior. */
153 /* Fetch register REGNUM from the child process. If REGNUM is -1, do
154 this for all registers (including the floating point and SSE
158 amd64_linux_fetch_inferior_registers (struct target_ops
*ops
,
159 struct regcache
*regcache
, int regnum
)
161 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
164 /* GNU/Linux LWP ID's are process ID's. */
165 tid
= TIDGET (inferior_ptid
);
167 tid
= PIDGET (inferior_ptid
); /* Not a threaded program. */
169 if (regnum
== -1 || amd64_native_gregset_supplies_p (gdbarch
, regnum
))
173 if (ptrace (PTRACE_GETREGS
, tid
, 0, (long) ®s
) < 0)
174 perror_with_name (_("Couldn't get registers"));
176 amd64_supply_native_gregset (regcache
, ®s
, -1);
181 if (regnum
== -1 || !amd64_native_gregset_supplies_p (gdbarch
, regnum
))
183 elf_fpregset_t fpregs
;
185 if (have_ptrace_getregset
)
187 char xstateregs
[I386_XSTATE_MAX_SIZE
];
190 iov
.iov_base
= xstateregs
;
191 iov
.iov_len
= sizeof (xstateregs
);
192 if (ptrace (PTRACE_GETREGSET
, tid
,
193 (unsigned int) NT_X86_XSTATE
, (long) &iov
) < 0)
194 perror_with_name (_("Couldn't get extended state status"));
196 amd64_supply_xsave (regcache
, -1, xstateregs
);
200 if (ptrace (PTRACE_GETFPREGS
, tid
, 0, (long) &fpregs
) < 0)
201 perror_with_name (_("Couldn't get floating point status"));
203 amd64_supply_fxsave (regcache
, -1, &fpregs
);
208 /* Store register REGNUM back into the child process. If REGNUM is
209 -1, do this for all registers (including the floating-point and SSE
213 amd64_linux_store_inferior_registers (struct target_ops
*ops
,
214 struct regcache
*regcache
, int regnum
)
216 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
219 /* GNU/Linux LWP ID's are process ID's. */
220 tid
= TIDGET (inferior_ptid
);
222 tid
= PIDGET (inferior_ptid
); /* Not a threaded program. */
224 if (regnum
== -1 || amd64_native_gregset_supplies_p (gdbarch
, regnum
))
228 if (ptrace (PTRACE_GETREGS
, tid
, 0, (long) ®s
) < 0)
229 perror_with_name (_("Couldn't get registers"));
231 amd64_collect_native_gregset (regcache
, ®s
, regnum
);
233 if (ptrace (PTRACE_SETREGS
, tid
, 0, (long) ®s
) < 0)
234 perror_with_name (_("Couldn't write registers"));
240 if (regnum
== -1 || !amd64_native_gregset_supplies_p (gdbarch
, regnum
))
242 elf_fpregset_t fpregs
;
244 if (have_ptrace_getregset
)
246 char xstateregs
[I386_XSTATE_MAX_SIZE
];
249 iov
.iov_base
= xstateregs
;
250 iov
.iov_len
= sizeof (xstateregs
);
251 if (ptrace (PTRACE_GETREGSET
, tid
,
252 (unsigned int) NT_X86_XSTATE
, (long) &iov
) < 0)
253 perror_with_name (_("Couldn't get extended state status"));
255 amd64_collect_xsave (regcache
, regnum
, xstateregs
, 0);
257 if (ptrace (PTRACE_SETREGSET
, tid
,
258 (unsigned int) NT_X86_XSTATE
, (long) &iov
) < 0)
259 perror_with_name (_("Couldn't write extended state status"));
263 if (ptrace (PTRACE_GETFPREGS
, tid
, 0, (long) &fpregs
) < 0)
264 perror_with_name (_("Couldn't get floating point status"));
266 amd64_collect_fxsave (regcache
, regnum
, &fpregs
);
268 if (ptrace (PTRACE_SETFPREGS
, tid
, 0, (long) &fpregs
) < 0)
269 perror_with_name (_("Couldn't write floating point status"));
274 /* Support for debug registers. */
277 amd64_linux_dr_get (ptid_t ptid
, int regnum
)
287 value
= ptrace (PTRACE_PEEKUSER
, tid
,
288 offsetof (struct user
, u_debugreg
[regnum
]), 0);
290 perror_with_name (_("Couldn't read debug register"));
295 /* Set debug register REGNUM to VALUE in only the one LWP of PTID. */
298 amd64_linux_dr_set (ptid_t ptid
, int regnum
, unsigned long value
)
307 ptrace (PTRACE_POKEUSER
, tid
,
308 offsetof (struct user
, u_debugreg
[regnum
]), value
);
310 perror_with_name (_("Couldn't write debug register"));
313 /* Return the inferior's debug register REGNUM. */
316 amd64_linux_dr_get_addr (int regnum
)
318 /* DR6 and DR7 are retrieved with some other way. */
319 gdb_assert (DR_FIRSTADDR
<= regnum
&& regnum
<= DR_LASTADDR
);
321 return amd64_linux_dr_get (inferior_ptid
, regnum
);
324 /* Return the inferior's DR7 debug control register. */
327 amd64_linux_dr_get_control (void)
329 return amd64_linux_dr_get (inferior_ptid
, DR_CONTROL
);
332 /* Get DR_STATUS from only the one LWP of INFERIOR_PTID. */
335 amd64_linux_dr_get_status (void)
337 return amd64_linux_dr_get (inferior_ptid
, DR_STATUS
);
340 /* Callback for linux_nat_iterate_watchpoint_lwps. Update the debug registers
344 update_debug_registers_callback (struct lwp_info
*lwp
, void *arg
)
346 if (lwp
->arch_private
== NULL
)
347 lwp
->arch_private
= XCNEW (struct arch_lwp_info
);
349 /* The actual update is done later just before resuming the lwp, we
350 just mark that the registers need updating. */
351 lwp
->arch_private
->debug_registers_changed
= 1;
353 /* If the lwp isn't stopped, force it to momentarily pause, so we
354 can update its debug registers. */
356 linux_stop_lwp (lwp
);
358 /* Continue the iteration. */
362 /* Set DR_CONTROL to CONTROL in all LWPs of the current inferior. */
365 amd64_linux_dr_set_control (unsigned long control
)
367 linux_nat_iterate_watchpoint_lwps (update_debug_registers_callback
, NULL
);
370 /* Set address REGNUM (zero based) to ADDR in all LWPs of the current
374 amd64_linux_dr_set_addr (int regnum
, CORE_ADDR addr
)
376 gdb_assert (regnum
>= 0 && regnum
<= DR_LASTADDR
- DR_FIRSTADDR
);
378 linux_nat_iterate_watchpoint_lwps (update_debug_registers_callback
, NULL
);
381 /* Called when resuming a thread.
382 If the debug regs have changed, update the thread's copies. */
385 amd64_linux_prepare_to_resume (struct lwp_info
*lwp
)
387 int clear_status
= 0;
389 /* NULL means this is the main thread still going through the shell,
390 or, no watchpoint has been set yet. In that case, there's
392 if (lwp
->arch_private
== NULL
)
395 if (lwp
->arch_private
->debug_registers_changed
)
397 struct i386_debug_reg_state
*state
= i386_debug_reg_state ();
400 /* On Linux kernel before 2.6.33 commit
401 72f674d203cd230426437cdcf7dd6f681dad8b0d
402 if you enable a breakpoint by the DR_CONTROL bits you need to have
403 already written the corresponding DR_FIRSTADDR...DR_LASTADDR registers.
405 Ensure DR_CONTROL gets written as the very last register here. */
407 for (i
= DR_FIRSTADDR
; i
<= DR_LASTADDR
; i
++)
408 if (state
->dr_ref_count
[i
] > 0)
410 amd64_linux_dr_set (lwp
->ptid
, i
, state
->dr_mirror
[i
]);
412 /* If we're setting a watchpoint, any change the inferior
413 had done itself to the debug registers needs to be
414 discarded, otherwise, i386_stopped_data_address can get
419 amd64_linux_dr_set (lwp
->ptid
, DR_CONTROL
, state
->dr_control_mirror
);
421 lwp
->arch_private
->debug_registers_changed
= 0;
424 if (clear_status
|| lwp
->stopped_by_watchpoint
)
425 amd64_linux_dr_set (lwp
->ptid
, DR_STATUS
, 0);
429 amd64_linux_new_thread (struct lwp_info
*lp
)
431 struct arch_lwp_info
*info
= XCNEW (struct arch_lwp_info
);
433 info
->debug_registers_changed
= 1;
435 lp
->arch_private
= info
;
439 /* This function is called by libthread_db as part of its handling of
440 a request for a thread's local storage address. */
443 ps_get_thread_area (const struct ps_prochandle
*ph
,
444 lwpid_t lwpid
, int idx
, void **base
)
446 if (gdbarch_bfd_arch_info (target_gdbarch
)->bits_per_word
== 32)
448 /* The full structure is found in <asm-i386/ldt.h>. The second
449 integer is the LDT's base_address and that is used to locate
450 the thread's local storage. See i386-linux-nat.c more
452 unsigned int desc
[4];
454 /* This code assumes that "int" is 32 bits and that
455 GET_THREAD_AREA returns no more than 4 int values. */
456 gdb_assert (sizeof (int) == 4);
457 #ifndef PTRACE_GET_THREAD_AREA
458 #define PTRACE_GET_THREAD_AREA 25
460 if (ptrace (PTRACE_GET_THREAD_AREA
,
461 lwpid
, (void *) (long) idx
, (unsigned long) &desc
) < 0)
464 /* Extend the value to 64 bits. Here it's assumed that a "long"
465 and a "void *" are the same. */
466 (*base
) = (void *) (long) desc
[1];
471 /* This definition comes from prctl.h, but some kernels may not
473 #ifndef PTRACE_ARCH_PRCTL
474 #define PTRACE_ARCH_PRCTL 30
476 /* FIXME: ezannoni-2003-07-09 see comment above about include
477 file order. We could be getting bogus values for these two. */
478 gdb_assert (FS
< ELF_NGREG
);
479 gdb_assert (GS
< ELF_NGREG
);
483 #ifdef HAVE_STRUCT_USER_REGS_STRUCT_FS_BASE
485 /* PTRACE_ARCH_PRCTL is obsolete since 2.6.25, where the
486 fs_base and gs_base fields of user_regs_struct can be
490 fs
= ptrace (PTRACE_PEEKUSER
, lwpid
,
491 offsetof (struct user_regs_struct
, fs_base
), 0);
499 if (ptrace (PTRACE_ARCH_PRCTL
, lwpid
, base
, ARCH_GET_FS
) == 0)
503 #ifdef HAVE_STRUCT_USER_REGS_STRUCT_GS_BASE
507 gs
= ptrace (PTRACE_PEEKUSER
, lwpid
,
508 offsetof (struct user_regs_struct
, gs_base
), 0);
516 if (ptrace (PTRACE_ARCH_PRCTL
, lwpid
, base
, ARCH_GET_GS
) == 0)
519 default: /* Should not happen. */
523 return PS_ERR
; /* ptrace failed. */
527 static void (*super_post_startup_inferior
) (ptid_t ptid
);
530 amd64_linux_child_post_startup_inferior (ptid_t ptid
)
532 i386_cleanup_dregs ();
533 super_post_startup_inferior (ptid
);
537 /* When GDB is built as a 64-bit application on linux, the
538 PTRACE_GETSIGINFO data is always presented in 64-bit layout. Since
539 debugging a 32-bit inferior with a 64-bit GDB should look the same
540 as debugging it with a 32-bit GDB, we do the 32-bit <-> 64-bit
541 conversion in-place ourselves. */
543 /* These types below (compat_*) define a siginfo type that is layout
544 compatible with the siginfo type exported by the 32-bit userspace
547 typedef int compat_int_t
;
548 typedef unsigned int compat_uptr_t
;
550 typedef int compat_time_t
;
551 typedef int compat_timer_t
;
552 typedef int compat_clock_t
;
554 struct compat_timeval
556 compat_time_t tv_sec
;
560 typedef union compat_sigval
562 compat_int_t sival_int
;
563 compat_uptr_t sival_ptr
;
566 typedef struct compat_siginfo
574 int _pad
[((128 / sizeof (int)) - 3)];
583 /* POSIX.1b timers */
588 compat_sigval_t _sigval
;
591 /* POSIX.1b signals */
596 compat_sigval_t _sigval
;
605 compat_clock_t _utime
;
606 compat_clock_t _stime
;
609 /* SIGILL, SIGFPE, SIGSEGV, SIGBUS */
624 /* For x32, clock_t in _sigchld is 64bit aligned at 4 bytes. */
625 typedef struct compat_x32_clock
629 } compat_x32_clock_t
;
631 typedef struct compat_x32_siginfo
639 int _pad
[((128 / sizeof (int)) - 3)];
648 /* POSIX.1b timers */
653 compat_sigval_t _sigval
;
656 /* POSIX.1b signals */
661 compat_sigval_t _sigval
;
670 compat_x32_clock_t _utime
;
671 compat_x32_clock_t _stime
;
674 /* SIGILL, SIGFPE, SIGSEGV, SIGBUS */
687 } compat_x32_siginfo_t
;
689 #define cpt_si_pid _sifields._kill._pid
690 #define cpt_si_uid _sifields._kill._uid
691 #define cpt_si_timerid _sifields._timer._tid
692 #define cpt_si_overrun _sifields._timer._overrun
693 #define cpt_si_status _sifields._sigchld._status
694 #define cpt_si_utime _sifields._sigchld._utime
695 #define cpt_si_stime _sifields._sigchld._stime
696 #define cpt_si_ptr _sifields._rt._sigval.sival_ptr
697 #define cpt_si_addr _sifields._sigfault._addr
698 #define cpt_si_band _sifields._sigpoll._band
699 #define cpt_si_fd _sifields._sigpoll._fd
701 /* glibc at least up to 2.3.2 doesn't have si_timerid, si_overrun.
702 In their place is si_timer1,si_timer2. */
704 #define si_timerid si_timer1
707 #define si_overrun si_timer2
711 compat_siginfo_from_siginfo (compat_siginfo_t
*to
, siginfo_t
*from
)
713 memset (to
, 0, sizeof (*to
));
715 to
->si_signo
= from
->si_signo
;
716 to
->si_errno
= from
->si_errno
;
717 to
->si_code
= from
->si_code
;
719 if (to
->si_code
== SI_TIMER
)
721 to
->cpt_si_timerid
= from
->si_timerid
;
722 to
->cpt_si_overrun
= from
->si_overrun
;
723 to
->cpt_si_ptr
= (intptr_t) from
->si_ptr
;
725 else if (to
->si_code
== SI_USER
)
727 to
->cpt_si_pid
= from
->si_pid
;
728 to
->cpt_si_uid
= from
->si_uid
;
730 else if (to
->si_code
< 0)
732 to
->cpt_si_pid
= from
->si_pid
;
733 to
->cpt_si_uid
= from
->si_uid
;
734 to
->cpt_si_ptr
= (intptr_t) from
->si_ptr
;
738 switch (to
->si_signo
)
741 to
->cpt_si_pid
= from
->si_pid
;
742 to
->cpt_si_uid
= from
->si_uid
;
743 to
->cpt_si_status
= from
->si_status
;
744 to
->cpt_si_utime
= from
->si_utime
;
745 to
->cpt_si_stime
= from
->si_stime
;
751 to
->cpt_si_addr
= (intptr_t) from
->si_addr
;
754 to
->cpt_si_band
= from
->si_band
;
755 to
->cpt_si_fd
= from
->si_fd
;
758 to
->cpt_si_pid
= from
->si_pid
;
759 to
->cpt_si_uid
= from
->si_uid
;
760 to
->cpt_si_ptr
= (intptr_t) from
->si_ptr
;
767 siginfo_from_compat_siginfo (siginfo_t
*to
, compat_siginfo_t
*from
)
769 memset (to
, 0, sizeof (*to
));
771 to
->si_signo
= from
->si_signo
;
772 to
->si_errno
= from
->si_errno
;
773 to
->si_code
= from
->si_code
;
775 if (to
->si_code
== SI_TIMER
)
777 to
->si_timerid
= from
->cpt_si_timerid
;
778 to
->si_overrun
= from
->cpt_si_overrun
;
779 to
->si_ptr
= (void *) (intptr_t) from
->cpt_si_ptr
;
781 else if (to
->si_code
== SI_USER
)
783 to
->si_pid
= from
->cpt_si_pid
;
784 to
->si_uid
= from
->cpt_si_uid
;
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
;
794 switch (to
->si_signo
)
797 to
->si_pid
= from
->cpt_si_pid
;
798 to
->si_uid
= from
->cpt_si_uid
;
799 to
->si_status
= from
->cpt_si_status
;
800 to
->si_utime
= from
->cpt_si_utime
;
801 to
->si_stime
= from
->cpt_si_stime
;
807 to
->si_addr
= (void *) (intptr_t) from
->cpt_si_addr
;
810 to
->si_band
= from
->cpt_si_band
;
811 to
->si_fd
= from
->cpt_si_fd
;
814 to
->si_pid
= from
->cpt_si_pid
;
815 to
->si_uid
= from
->cpt_si_uid
;
816 to
->si_ptr
= (void* ) (intptr_t) from
->cpt_si_ptr
;
823 compat_x32_siginfo_from_siginfo (compat_x32_siginfo_t
*to
,
826 memset (to
, 0, sizeof (*to
));
828 to
->si_signo
= from
->si_signo
;
829 to
->si_errno
= from
->si_errno
;
830 to
->si_code
= from
->si_code
;
832 if (to
->si_code
== SI_TIMER
)
834 to
->cpt_si_timerid
= from
->si_timerid
;
835 to
->cpt_si_overrun
= from
->si_overrun
;
836 to
->cpt_si_ptr
= (intptr_t) from
->si_ptr
;
838 else if (to
->si_code
== SI_USER
)
840 to
->cpt_si_pid
= from
->si_pid
;
841 to
->cpt_si_uid
= from
->si_uid
;
843 else if (to
->si_code
< 0)
845 to
->cpt_si_pid
= from
->si_pid
;
846 to
->cpt_si_uid
= from
->si_uid
;
847 to
->cpt_si_ptr
= (intptr_t) from
->si_ptr
;
851 switch (to
->si_signo
)
854 to
->cpt_si_pid
= from
->si_pid
;
855 to
->cpt_si_uid
= from
->si_uid
;
856 to
->cpt_si_status
= from
->si_status
;
857 memcpy (&to
->cpt_si_utime
, &from
->si_utime
,
858 sizeof (to
->cpt_si_utime
));
859 memcpy (&to
->cpt_si_stime
, &from
->si_stime
,
860 sizeof (to
->cpt_si_stime
));
866 to
->cpt_si_addr
= (intptr_t) from
->si_addr
;
869 to
->cpt_si_band
= from
->si_band
;
870 to
->cpt_si_fd
= from
->si_fd
;
873 to
->cpt_si_pid
= from
->si_pid
;
874 to
->cpt_si_uid
= from
->si_uid
;
875 to
->cpt_si_ptr
= (intptr_t) from
->si_ptr
;
882 siginfo_from_compat_x32_siginfo (siginfo_t
*to
,
883 compat_x32_siginfo_t
*from
)
885 memset (to
, 0, sizeof (*to
));
887 to
->si_signo
= from
->si_signo
;
888 to
->si_errno
= from
->si_errno
;
889 to
->si_code
= from
->si_code
;
891 if (to
->si_code
== SI_TIMER
)
893 to
->si_timerid
= from
->cpt_si_timerid
;
894 to
->si_overrun
= from
->cpt_si_overrun
;
895 to
->si_ptr
= (void *) (intptr_t) from
->cpt_si_ptr
;
897 else if (to
->si_code
== SI_USER
)
899 to
->si_pid
= from
->cpt_si_pid
;
900 to
->si_uid
= from
->cpt_si_uid
;
904 to
->si_pid
= from
->cpt_si_pid
;
905 to
->si_uid
= from
->cpt_si_uid
;
906 to
->si_ptr
= (void *) (intptr_t) from
->cpt_si_ptr
;
910 switch (to
->si_signo
)
913 to
->si_pid
= from
->cpt_si_pid
;
914 to
->si_uid
= from
->cpt_si_uid
;
915 to
->si_status
= from
->cpt_si_status
;
916 memcpy (&to
->si_utime
, &from
->cpt_si_utime
,
917 sizeof (to
->si_utime
));
918 memcpy (&to
->si_stime
, &from
->cpt_si_stime
,
919 sizeof (to
->si_stime
));
925 to
->si_addr
= (void *) (intptr_t) from
->cpt_si_addr
;
928 to
->si_band
= from
->cpt_si_band
;
929 to
->si_fd
= from
->cpt_si_fd
;
932 to
->si_pid
= from
->cpt_si_pid
;
933 to
->si_uid
= from
->cpt_si_uid
;
934 to
->si_ptr
= (void* ) (intptr_t) from
->cpt_si_ptr
;
940 /* Convert a native/host siginfo object, into/from the siginfo in the
941 layout of the inferiors' architecture. Returns true if any
942 conversion was done; false otherwise. If DIRECTION is 1, then copy
943 from INF to NATIVE. If DIRECTION is 0, copy from NATIVE to
947 amd64_linux_siginfo_fixup (siginfo_t
*native
, gdb_byte
*inf
, int direction
)
949 struct gdbarch
*gdbarch
= get_frame_arch (get_current_frame ());
951 /* Is the inferior 32-bit? If so, then do fixup the siginfo
953 if (gdbarch_bfd_arch_info (gdbarch
)->bits_per_word
== 32)
955 gdb_assert (sizeof (siginfo_t
) == sizeof (compat_siginfo_t
));
958 compat_siginfo_from_siginfo ((struct compat_siginfo
*) inf
, native
);
960 siginfo_from_compat_siginfo (native
, (struct compat_siginfo
*) inf
);
964 /* No fixup for native x32 GDB. */
965 else if (gdbarch_addr_bit (gdbarch
) == 32 && sizeof (void *) == 8)
967 gdb_assert (sizeof (siginfo_t
) == sizeof (compat_x32_siginfo_t
));
970 compat_x32_siginfo_from_siginfo ((struct compat_x32_siginfo
*) inf
,
973 siginfo_from_compat_x32_siginfo (native
,
974 (struct compat_x32_siginfo
*) inf
);
982 /* Get Linux/x86 target description from running target.
984 Value of CS segment register:
985 1. 64bit process: 0x33.
986 2. 32bit process: 0x23.
988 Value of DS segment register:
989 1. LP64 process: 0x0.
990 2. X32 process: 0x2b.
993 #define AMD64_LINUX_USER64_CS 0x33
994 #define AMD64_LINUX_X32_DS 0x2b
996 static const struct target_desc
*
997 amd64_linux_read_description (struct target_ops
*ops
)
1004 static uint64_t xcr0
;
1006 /* GNU/Linux LWP ID's are process ID's. */
1007 tid
= TIDGET (inferior_ptid
);
1009 tid
= PIDGET (inferior_ptid
); /* Not a threaded program. */
1011 /* Get CS register. */
1013 cs
= ptrace (PTRACE_PEEKUSER
, tid
,
1014 offsetof (struct user_regs_struct
, cs
), 0);
1016 perror_with_name (_("Couldn't get CS register"));
1018 is_64bit
= cs
== AMD64_LINUX_USER64_CS
;
1020 /* Get DS register. */
1022 ds
= ptrace (PTRACE_PEEKUSER
, tid
,
1023 offsetof (struct user_regs_struct
, ds
), 0);
1025 perror_with_name (_("Couldn't get DS register"));
1027 is_x32
= ds
== AMD64_LINUX_X32_DS
;
1029 if (sizeof (void *) == 4 && is_64bit
&& !is_x32
)
1030 error (_("Can't debug 64-bit process with 32-bit GDB"));
1032 if (have_ptrace_getregset
== -1)
1034 uint64_t xstateregs
[(I386_XSTATE_SSE_SIZE
/ sizeof (uint64_t))];
1037 iov
.iov_base
= xstateregs
;
1038 iov
.iov_len
= sizeof (xstateregs
);
1040 /* Check if PTRACE_GETREGSET works. */
1041 if (ptrace (PTRACE_GETREGSET
, tid
,
1042 (unsigned int) NT_X86_XSTATE
, (long) &iov
) < 0)
1043 have_ptrace_getregset
= 0;
1046 have_ptrace_getregset
= 1;
1048 /* Get XCR0 from XSAVE extended state. */
1049 xcr0
= xstateregs
[(I386_LINUX_XSAVE_XCR0_OFFSET
1050 / sizeof (uint64_t))];
1054 /* Check the native XCR0 only if PTRACE_GETREGSET is available. */
1055 if (have_ptrace_getregset
1056 && (xcr0
& I386_XSTATE_AVX_MASK
) == I386_XSTATE_AVX_MASK
)
1061 return tdesc_x32_avx_linux
;
1063 return tdesc_amd64_avx_linux
;
1066 return tdesc_i386_avx_linux
;
1073 return tdesc_x32_linux
;
1075 return tdesc_amd64_linux
;
1078 return tdesc_i386_linux
;
1082 /* Provide a prototype to silence -Wmissing-prototypes. */
1083 void _initialize_amd64_linux_nat (void);
1086 _initialize_amd64_linux_nat (void)
1088 struct target_ops
*t
;
1090 amd64_native_gregset32_reg_offset
= amd64_linux_gregset32_reg_offset
;
1091 amd64_native_gregset32_num_regs
= I386_LINUX_NUM_REGS
;
1092 amd64_native_gregset64_reg_offset
= amd64_linux_gregset_reg_offset
;
1093 amd64_native_gregset64_num_regs
= AMD64_LINUX_NUM_REGS
;
1095 gdb_assert (ARRAY_SIZE (amd64_linux_gregset32_reg_offset
)
1096 == amd64_native_gregset32_num_regs
);
1098 /* Fill in the generic GNU/Linux methods. */
1099 t
= linux_target ();
1101 i386_use_watchpoints (t
);
1103 i386_dr_low
.set_control
= amd64_linux_dr_set_control
;
1104 i386_dr_low
.set_addr
= amd64_linux_dr_set_addr
;
1105 i386_dr_low
.get_addr
= amd64_linux_dr_get_addr
;
1106 i386_dr_low
.get_status
= amd64_linux_dr_get_status
;
1107 i386_dr_low
.get_control
= amd64_linux_dr_get_control
;
1108 i386_set_debug_register_length (8);
1110 /* Override the GNU/Linux inferior startup hook. */
1111 super_post_startup_inferior
= t
->to_post_startup_inferior
;
1112 t
->to_post_startup_inferior
= amd64_linux_child_post_startup_inferior
;
1114 /* Add our register access methods. */
1115 t
->to_fetch_registers
= amd64_linux_fetch_inferior_registers
;
1116 t
->to_store_registers
= amd64_linux_store_inferior_registers
;
1118 t
->to_read_description
= amd64_linux_read_description
;
1120 /* Register the target. */
1121 linux_nat_add_target (t
);
1122 linux_nat_set_new_thread (t
, amd64_linux_new_thread
);
1123 linux_nat_set_siginfo_fixup (t
, amd64_linux_siginfo_fixup
);
1124 linux_nat_set_prepare_to_resume (t
, amd64_linux_prepare_to_resume
);