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