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);