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
  22 /* Local non-gdb includes.  */
  23 #include "inferior.h"
  24 #include "regcache.h"
  25 #include "target.h"
  26
  27 /* We include <signal.h> to make sure `struct fxsave64' is defined on
  28    NetBSD, since NetBSD's <machine/reg.h> needs it.  */
  29 #include <signal.h>
  30 #include <sys/types.h>
  31 #include <sys/ptrace.h>
  32 #include <machine/reg.h>
  33
  34 #include "amd64-tdep.h"
  35 #include "amd64-nat.h"
  36 #include "x86-bsd-nat.h"
  37 #include "inf-ptrace.h"
  38 \f
  39
  40 /* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this
  41    for all registers (including the floating-point registers).  */
  42
  43 void
  44 amd64bsd_fetch_inferior_registers (struct regcache *regcache, int regnum)
  45 {
  46   struct gdbarch *gdbarch = regcache->arch ();
  47   pid_t pid = get_ptrace_pid (regcache->ptid ());
  48 #if defined(PT_GETFSBASE) || defined(PT_GETGSBASE)
  49   const struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
  50 #endif
  51
  52   if (regnum == -1 || amd64_native_gregset_supplies_p (gdbarch, regnum))
  53     {
  54       struct reg regs;
  55
  56       if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  57         perror_with_name (_("Couldn't get registers"));
  58
  59       amd64_supply_native_gregset (regcache, &regs, -1);
  60       if (regnum != -1)
  61         return;
  62     }
  63
  64 #ifdef PT_GETFSBASE
  65   if (regnum == -1 || regnum == tdep->fsbase_regnum)
  66     {
  67       register_t base;
  68
  69       if (ptrace (PT_GETFSBASE, pid, (PTRACE_TYPE_ARG3) &base, 0) == -1)
  70         perror_with_name (_("Couldn't get segment register fs_base"));
  71
  72       regcache->raw_supply (tdep->fsbase_regnum, &base);
  73       if (regnum != -1)
  74         return;
  75     }
  76 #endif
  77 #ifdef PT_GETGSBASE
  78   if (regnum == -1 || regnum == tdep->fsbase_regnum + 1)
  79     {
  80       register_t base;
  81
  82       if (ptrace (PT_GETGSBASE, pid, (PTRACE_TYPE_ARG3) &base, 0) == -1)
  83         perror_with_name (_("Couldn't get segment register gs_base"));
  84
  85       regcache->raw_supply (tdep->fsbase_regnum + 1, &base);
  86       if (regnum != -1)
  87         return;
  88     }
  89 #endif
  90
  91   if (regnum == -1 || !amd64_native_gregset_supplies_p (gdbarch, regnum))
  92     {
  93       struct fpreg fpregs;
  94 #ifdef PT_GETXSTATE_INFO
  95       void *xstateregs;
  96
  97       if (x86bsd_xsave_len != 0)
  98         {
  99           xstateregs = alloca (x86bsd_xsave_len);
 100           if (ptrace (PT_GETXSTATE, pid, (PTRACE_TYPE_ARG3) xstateregs, 0)
 101               == -1)
 102             perror_with_name (_("Couldn't get extended state status"));
 103
 104           amd64_supply_xsave (regcache, -1, xstateregs);
 105           return;
 106         }
 107 #endif
 108
 109       if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 110         perror_with_name (_("Couldn't get floating point status"));
 111
 112       amd64_supply_fxsave (regcache, -1, &fpregs);
 113     }
 114 }
 115
 116 /* Store register REGNUM back into the inferior.  If REGNUM is -1, do
 117    this for all registers (including the floating-point registers).  */
 118
 119 void
 120 amd64bsd_store_inferior_registers (struct regcache *regcache, int regnum)
 121 {
 122   struct gdbarch *gdbarch = regcache->arch ();
 123   pid_t pid = get_ptrace_pid (regcache->ptid ());
 124 #if defined(PT_SETFSBASE) || defined(PT_SETGSBASE)
 125   const struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 126 #endif
 127
 128   if (regnum == -1 || amd64_native_gregset_supplies_p (gdbarch, regnum))
 129     {
 130       struct reg regs;
 131
 132       if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 133         perror_with_name (_("Couldn't get registers"));
 134
 135       amd64_collect_native_gregset (regcache, &regs, regnum);
 136
 137       if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 138         perror_with_name (_("Couldn't write registers"));
 139
 140       if (regnum != -1)
 141         return;
 142     }
 143
 144 #ifdef PT_SETFSBASE
 145   if (regnum == -1 || regnum == tdep->fsbase_regnum)
 146     {
 147       register_t base;
 148
 149       /* Clear the full base value to support 32-bit targets.  */
 150       base = 0;
 151       regcache->raw_collect (tdep->fsbase_regnum, &base);
 152
 153       if (ptrace (PT_SETFSBASE, pid, (PTRACE_TYPE_ARG3) &base, 0) == -1)
 154         perror_with_name (_("Couldn't write segment register fs_base"));
 155       if (regnum != -1)
 156         return;
 157     }
 158 #endif
 159 #ifdef PT_SETGSBASE
 160   if (regnum == -1 || regnum == tdep->fsbase_regnum + 1)
 161     {
 162       register_t base;
 163
 164       /* Clear the full base value to support 32-bit targets.  */
 165       base = 0;
 166       regcache->raw_collect (tdep->fsbase_regnum + 1, &base);
 167
 168       if (ptrace (PT_SETGSBASE, pid, (PTRACE_TYPE_ARG3) &base, 0) == -1)
 169         perror_with_name (_("Couldn't write segment register gs_base"));
 170       if (regnum != -1)
 171         return;
 172     }
 173 #endif
 174
 175   if (regnum == -1 || !amd64_native_gregset_supplies_p (gdbarch, regnum))
 176     {
 177       struct fpreg fpregs;
 178 #ifdef PT_GETXSTATE_INFO
 179       void *xstateregs;
 180
 181       if (x86bsd_xsave_len != 0)
 182         {
 183           xstateregs = alloca (x86bsd_xsave_len);
 184           if (ptrace (PT_GETXSTATE, pid, (PTRACE_TYPE_ARG3) xstateregs, 0)
 185               == -1)
 186             perror_with_name (_("Couldn't get extended state status"));
 187
 188           amd64_collect_xsave (regcache, regnum, xstateregs, 0);
 189
 190           if (ptrace (PT_SETXSTATE, pid, (PTRACE_TYPE_ARG3) xstateregs,
 191                       x86bsd_xsave_len) == -1)
 192             perror_with_name (_("Couldn't write extended state status"));
 193           return;
 194         }
 195 #endif
 196
 197       if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 198         perror_with_name (_("Couldn't get floating point status"));
 199
 200       amd64_collect_fxsave (regcache, regnum, &fpregs);
 201
 202       if (ptrace (PT_SETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 203         perror_with_name (_("Couldn't write floating point status"));
 204     }
 205 }