gdb/amd64-bsd-nat.c

   1 /* Native-dependent code for AMD64 BSD's.
   2
   3    Copyright (C) 2003-2020 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 #if defined(PT_GETFSBASE) || defined(PT_GETGSBASE)
  47   const struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
  48 #endif
  49
  50   if (regnum == -1 || amd64_native_gregset_supplies_p (gdbarch, regnum))
  51     {
  52       struct reg regs;
  53
  54       if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  55         perror_with_name (_("Couldn't get registers"));
  56
  57       amd64_supply_native_gregset (regcache, &regs, -1);
  58       if (regnum != -1)
  59         return;
  60     }
  61
  62 #ifdef PT_GETFSBASE
  63   if (regnum == -1 || regnum == tdep->fsbase_regnum)
  64     {
  65       register_t base;
  66
  67       if (ptrace (PT_GETFSBASE, pid, (PTRACE_TYPE_ARG3) &base, 0) == -1)
  68         perror_with_name (_("Couldn't get segment register fs_base"));
  69
  70       regcache->raw_supply (tdep->fsbase_regnum, &base);
  71       if (regnum != -1)
  72         return;
  73     }
  74 #endif
  75 #ifdef PT_GETGSBASE
  76   if (regnum == -1 || regnum == tdep->fsbase_regnum + 1)
  77     {
  78       register_t base;
  79
  80       if (ptrace (PT_GETGSBASE, pid, (PTRACE_TYPE_ARG3) &base, 0) == -1)
  81         perror_with_name (_("Couldn't get segment register gs_base"));
  82
  83       regcache->raw_supply (tdep->fsbase_regnum + 1, &base);
  84       if (regnum != -1)
  85         return;
  86     }
  87 #endif
  88
  89   if (regnum == -1 || !amd64_native_gregset_supplies_p (gdbarch, regnum))
  90     {
  91       struct fpreg fpregs;
  92 #ifdef PT_GETXSTATE_INFO
  93       void *xstateregs;
  94
  95       if (x86bsd_xsave_len != 0)
  96         {
  97           xstateregs = alloca (x86bsd_xsave_len);
  98           if (ptrace (PT_GETXSTATE, pid, (PTRACE_TYPE_ARG3) xstateregs, 0)
  99               == -1)
 100             perror_with_name (_("Couldn't get extended state status"));
 101
 102           amd64_supply_xsave (regcache, -1, xstateregs);
 103           return;
 104         }
 105 #endif
 106
 107       if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 108         perror_with_name (_("Couldn't get floating point status"));
 109
 110       amd64_supply_fxsave (regcache, -1, &fpregs);
 111     }
 112 }
 113
 114 /* Store register REGNUM back into the inferior.  If REGNUM is -1, do
 115    this for all registers (including the floating-point registers).  */
 116
 117 void
 118 amd64bsd_store_inferior_registers (struct regcache *regcache, int regnum)
 119 {
 120   struct gdbarch *gdbarch = regcache->arch ();
 121   pid_t pid = get_ptrace_pid (regcache->ptid ());
 122 #if defined(PT_SETFSBASE) || defined(PT_SETGSBASE)
 123   const struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 124 #endif
 125
 126   if (regnum == -1 || amd64_native_gregset_supplies_p (gdbarch, regnum))
 127     {
 128       struct reg regs;
 129
 130       if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 131         perror_with_name (_("Couldn't get registers"));
 132
 133       amd64_collect_native_gregset (regcache, &regs, regnum);
 134
 135       if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 136         perror_with_name (_("Couldn't write registers"));
 137
 138       if (regnum != -1)
 139         return;
 140     }
 141
 142 #ifdef PT_SETFSBASE
 143   if (regnum == -1 || regnum == tdep->fsbase_regnum)
 144     {
 145       register_t base;
 146
 147       /* Clear the full base value to support 32-bit targets.  */
 148       base = 0;
 149       regcache->raw_collect (tdep->fsbase_regnum, &base);
 150
 151       if (ptrace (PT_SETFSBASE, pid, (PTRACE_TYPE_ARG3) &base, 0) == -1)
 152         perror_with_name (_("Couldn't write segment register fs_base"));
 153       if (regnum != -1)
 154         return;
 155     }
 156 #endif
 157 #ifdef PT_SETGSBASE
 158   if (regnum == -1 || regnum == tdep->fsbase_regnum + 1)
 159     {
 160       register_t base;
 161
 162       /* Clear the full base value to support 32-bit targets.  */
 163       base = 0;
 164       regcache->raw_collect (tdep->fsbase_regnum + 1, &base);
 165
 166       if (ptrace (PT_SETGSBASE, pid, (PTRACE_TYPE_ARG3) &base, 0) == -1)
 167         perror_with_name (_("Couldn't write segment register gs_base"));
 168       if (regnum != -1)
 169         return;
 170     }
 171 #endif
 172
 173   if (regnum == -1 || !amd64_native_gregset_supplies_p (gdbarch, regnum))
 174     {
 175       struct fpreg fpregs;
 176 #ifdef PT_GETXSTATE_INFO
 177       void *xstateregs;
 178
 179       if (x86bsd_xsave_len != 0)
 180         {
 181           xstateregs = alloca (x86bsd_xsave_len);
 182           if (ptrace (PT_GETXSTATE, pid, (PTRACE_TYPE_ARG3) xstateregs, 0)
 183               == -1)
 184             perror_with_name (_("Couldn't get extended state status"));
 185
 186           amd64_collect_xsave (regcache, regnum, xstateregs, 0);
 187
 188           if (ptrace (PT_SETXSTATE, pid, (PTRACE_TYPE_ARG3) xstateregs,
 189                       x86bsd_xsave_len) == -1)
 190             perror_with_name (_("Couldn't write extended state status"));
 191           return;
 192         }
 193 #endif
 194
 195       if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 196         perror_with_name (_("Couldn't get floating point status"));
 197
 198       amd64_collect_fxsave (regcache, regnum, &fpregs);
 199
 200       if (ptrace (PT_SETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 201         perror_with_name (_("Couldn't write floating point status"));
 202     }
 203 }