gdb/amd64-bsd-nat.c

   1 /* Native-dependent code for AMD64 BSD's.
   2
   3    Copyright (C) 2003-2019 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "defs.h"
  21 #include "inferior.h"
  22 #include "regcache.h"
  23 #include "target.h"
  24
  25 /* We include <signal.h> to make sure `struct fxsave64' is defined on
  26    NetBSD, since NetBSD's <machine/reg.h> needs it.  */
  27 #include <signal.h>
  28 #include <sys/types.h>
  29 #include <sys/ptrace.h>
  30 #include <machine/reg.h>
  31
  32 #include "amd64-tdep.h"
  33 #include "amd64-nat.h"
  34 #include "x86-bsd-nat.h"
  35 #include "inf-ptrace.h"
  36 \f
  37
  38 /* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this
  39    for all registers (including the floating-point registers).  */
  40
  41 void
  42 amd64bsd_fetch_inferior_registers (struct regcache *regcache, int regnum)
  43 {
  44   struct gdbarch *gdbarch = regcache->arch ();
  45   pid_t pid = get_ptrace_pid (regcache->ptid ());
  46
  47   if (regnum == -1 || amd64_native_gregset_supplies_p (gdbarch, regnum))
  48     {
  49       struct reg regs;
  50
  51       if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  52         perror_with_name (_("Couldn't get registers"));
  53
  54       amd64_supply_native_gregset (regcache, &regs, -1);
  55       if (regnum != -1)
  56         return;
  57     }
  58
  59 #ifdef PT_GETFSBASE
  60   if (regnum == -1 || regnum == AMD64_FSBASE_REGNUM)
  61     {
  62       register_t base;
  63
  64       if (ptrace (PT_GETFSBASE, pid, (PTRACE_TYPE_ARG3) &base, 0) == -1)
  65         perror_with_name (_("Couldn't get segment register fs_base"));
  66
  67       regcache->raw_supply (AMD64_FSBASE_REGNUM, &base);
  68       if (regnum != -1)
  69         return;
  70     }
  71 #endif
  72 #ifdef PT_GETGSBASE
  73   if (regnum == -1 || regnum == AMD64_GSBASE_REGNUM)
  74     {
  75       register_t base;
  76
  77       if (ptrace (PT_GETGSBASE, pid, (PTRACE_TYPE_ARG3) &base, 0) == -1)
  78         perror_with_name (_("Couldn't get segment register gs_base"));
  79
  80       regcache->raw_supply (AMD64_GSBASE_REGNUM, &base);
  81       if (regnum != -1)
  82         return;
  83     }
  84 #endif
  85
  86   if (regnum == -1 || !amd64_native_gregset_supplies_p (gdbarch, regnum))
  87     {
  88       struct fpreg fpregs;
  89 #ifdef PT_GETXSTATE_INFO
  90       void *xstateregs;
  91
  92       if (x86bsd_xsave_len != 0)
  93         {
  94           xstateregs = alloca (x86bsd_xsave_len);
  95           if (ptrace (PT_GETXSTATE, pid, (PTRACE_TYPE_ARG3) xstateregs, 0)
  96               == -1)
  97             perror_with_name (_("Couldn't get extended state status"));
  98
  99           amd64_supply_xsave (regcache, -1, xstateregs);
 100           return;
 101         }
 102 #endif
 103
 104       if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 105         perror_with_name (_("Couldn't get floating point status"));
 106
 107       amd64_supply_fxsave (regcache, -1, &fpregs);
 108     }
 109 }
 110
 111 /* Store register REGNUM back into the inferior.  If REGNUM is -1, do
 112    this for all registers (including the floating-point registers).  */
 113
 114 void
 115 amd64bsd_store_inferior_registers (struct regcache *regcache, int regnum)
 116 {
 117   struct gdbarch *gdbarch = regcache->arch ();
 118   pid_t pid = get_ptrace_pid (regcache->ptid ());
 119
 120   if (regnum == -1 || amd64_native_gregset_supplies_p (gdbarch, regnum))
 121     {
 122       struct reg regs;
 123
 124       if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 125         perror_with_name (_("Couldn't get registers"));
 126
 127       amd64_collect_native_gregset (regcache, &regs, regnum);
 128
 129       if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 130         perror_with_name (_("Couldn't write registers"));
 131
 132       if (regnum != -1)
 133         return;
 134     }
 135
 136 #ifdef PT_SETFSBASE
 137   if (regnum == -1 || regnum == AMD64_FSBASE_REGNUM)
 138     {
 139       register_t base;
 140
 141       regcache->raw_collect (AMD64_FSBASE_REGNUM, &base);
 142
 143       if (ptrace (PT_SETFSBASE, pid, (PTRACE_TYPE_ARG3) &base, 0) == -1)
 144         perror_with_name (_("Couldn't write segment register fs_base"));
 145       if (regnum != -1)
 146         return;
 147     }
 148 #endif
 149 #ifdef PT_SETGSBASE
 150   if (regnum == -1 || regnum == AMD64_GSBASE_REGNUM)
 151     {
 152       register_t base;
 153
 154       regcache->raw_collect (AMD64_GSBASE_REGNUM, &base);
 155
 156       if (ptrace (PT_SETGSBASE, pid, (PTRACE_TYPE_ARG3) &base, 0) == -1)
 157         perror_with_name (_("Couldn't write segment register gs_base"));
 158       if (regnum != -1)
 159         return;
 160     }
 161 #endif
 162
 163   if (regnum == -1 || !amd64_native_gregset_supplies_p (gdbarch, regnum))
 164     {
 165       struct fpreg fpregs;
 166 #ifdef PT_GETXSTATE_INFO
 167       void *xstateregs;
 168
 169       if (x86bsd_xsave_len != 0)
 170         {
 171           xstateregs = alloca (x86bsd_xsave_len);
 172           if (ptrace (PT_GETXSTATE, pid, (PTRACE_TYPE_ARG3) xstateregs, 0)
 173               == -1)
 174             perror_with_name (_("Couldn't get extended state status"));
 175
 176           amd64_collect_xsave (regcache, regnum, xstateregs, 0);
 177
 178           if (ptrace (PT_SETXSTATE, pid, (PTRACE_TYPE_ARG3) xstateregs,
 179                       x86bsd_xsave_len) == -1)
 180             perror_with_name (_("Couldn't write extended state status"));
 181           return;
 182         }
 183 #endif
 184
 185       if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 186         perror_with_name (_("Couldn't get floating point status"));
 187
 188       amd64_collect_fxsave (regcache, regnum, &fpregs);
 189
 190       if (ptrace (PT_SETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 191         perror_with_name (_("Couldn't write floating point status"));
 192     }
 193 }