gdb/amd64-bsd-nat.c

   1 /* Native-dependent code for AMD64 BSD's.
   2
   3    Copyright (C) 2003-2018 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 static void
  42 amd64bsd_fetch_inferior_registers (struct target_ops *ops,
  43                                    struct regcache *regcache, int regnum)
  44 {
  45   struct gdbarch *gdbarch = regcache->arch ();
  46   pid_t pid = get_ptrace_pid (regcache_get_ptid (regcache));
  47
  48   if (regnum == -1 || amd64_native_gregset_supplies_p (gdbarch, regnum))
  49     {
  50       struct reg regs;
  51
  52       if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  53         perror_with_name (_("Couldn't get registers"));
  54
  55       amd64_supply_native_gregset (regcache, &regs, -1);
  56       if (regnum != -1)
  57         return;
  58     }
  59
  60 #ifdef PT_GETFSBASE
  61   if (regnum == -1 || regnum == AMD64_FSBASE_REGNUM)
  62     {
  63       register_t base;
  64
  65       if (ptrace (PT_GETFSBASE, pid, (PTRACE_TYPE_ARG3) &base, 0) == -1)
  66         perror_with_name (_("Couldn't get segment register fs_base"));
  67
  68       regcache_raw_supply (regcache, AMD64_FSBASE_REGNUM, &base);
  69       if (regnum != -1)
  70         return;
  71     }
  72 #endif
  73 #ifdef PT_GETGSBASE
  74   if (regnum == -1 || regnum == AMD64_GSBASE_REGNUM)
  75     {
  76       register_t base;
  77
  78       if (ptrace (PT_GETGSBASE, pid, (PTRACE_TYPE_ARG3) &base, 0) == -1)
  79         perror_with_name (_("Couldn't get segment register gs_base"));
  80
  81       regcache_raw_supply (regcache, AMD64_GSBASE_REGNUM, &base);
  82       if (regnum != -1)
  83         return;
  84     }
  85 #endif
  86
  87   if (regnum == -1 || !amd64_native_gregset_supplies_p (gdbarch, regnum))
  88     {
  89       struct fpreg fpregs;
  90 #ifdef PT_GETXSTATE_INFO
  91       void *xstateregs;
  92
  93       if (x86bsd_xsave_len != 0)
  94         {
  95           xstateregs = alloca (x86bsd_xsave_len);
  96           if (ptrace (PT_GETXSTATE, pid, (PTRACE_TYPE_ARG3) xstateregs, 0)
  97               == -1)
  98             perror_with_name (_("Couldn't get extended state status"));
  99
 100           amd64_supply_xsave (regcache, -1, xstateregs);
 101           return;
 102         }
 103 #endif
 104
 105       if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 106         perror_with_name (_("Couldn't get floating point status"));
 107
 108       amd64_supply_fxsave (regcache, -1, &fpregs);
 109     }
 110 }
 111
 112 /* Store register REGNUM back into the inferior.  If REGNUM is -1, do
 113    this for all registers (including the floating-point registers).  */
 114
 115 static void
 116 amd64bsd_store_inferior_registers (struct target_ops *ops,
 117                                    struct regcache *regcache, int regnum)
 118 {
 119   struct gdbarch *gdbarch = regcache->arch ();
 120   pid_t pid = get_ptrace_pid (regcache_get_ptid (regcache));
 121
 122   if (regnum == -1 || amd64_native_gregset_supplies_p (gdbarch, regnum))
 123     {
 124       struct reg regs;
 125
 126       if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 127         perror_with_name (_("Couldn't get registers"));
 128
 129       amd64_collect_native_gregset (regcache, &regs, regnum);
 130
 131       if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 132         perror_with_name (_("Couldn't write registers"));
 133
 134       if (regnum != -1)
 135         return;
 136     }
 137
 138 #ifdef PT_SETFSBASE
 139   if (regnum == -1 || regnum == AMD64_FSBASE_REGNUM)
 140     {
 141       register_t base;
 142
 143       regcache_raw_collect (regcache, AMD64_FSBASE_REGNUM, &base);
 144
 145       if (ptrace (PT_SETFSBASE, pid, (PTRACE_TYPE_ARG3) &base, 0) == -1)
 146         perror_with_name (_("Couldn't write segment register fs_base"));
 147       if (regnum != -1)
 148         return;
 149     }
 150 #endif
 151 #ifdef PT_SETGSBASE
 152   if (regnum == -1 || regnum == AMD64_GSBASE_REGNUM)
 153     {
 154       register_t base;
 155
 156       regcache_raw_collect (regcache, AMD64_GSBASE_REGNUM, &base);
 157
 158       if (ptrace (PT_SETGSBASE, pid, (PTRACE_TYPE_ARG3) &base, 0) == -1)
 159         perror_with_name (_("Couldn't write segment register gs_base"));
 160       if (regnum != -1)
 161         return;
 162     }
 163 #endif
 164
 165   if (regnum == -1 || !amd64_native_gregset_supplies_p (gdbarch, regnum))
 166     {
 167       struct fpreg fpregs;
 168 #ifdef PT_GETXSTATE_INFO
 169       void *xstateregs;
 170
 171       if (x86bsd_xsave_len != 0)
 172         {
 173           xstateregs = alloca (x86bsd_xsave_len);
 174           if (ptrace (PT_GETXSTATE, pid, (PTRACE_TYPE_ARG3) xstateregs, 0)
 175               == -1)
 176             perror_with_name (_("Couldn't get extended state status"));
 177
 178           amd64_collect_xsave (regcache, regnum, xstateregs, 0);
 179
 180           if (ptrace (PT_SETXSTATE, pid, (PTRACE_TYPE_ARG3) xstateregs,
 181                       x86bsd_xsave_len) == -1)
 182             perror_with_name (_("Couldn't write extended state status"));
 183           return;
 184         }
 185 #endif
 186
 187       if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 188         perror_with_name (_("Couldn't get floating point status"));
 189
 190       amd64_collect_fxsave (regcache, regnum, &fpregs);
 191
 192       if (ptrace (PT_SETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 193         perror_with_name (_("Couldn't write floating point status"));
 194     }
 195 }
 196
 197 /* Create a prototype *BSD/amd64 target.  The client can override it
 198    with local methods.  */
 199
 200 struct target_ops *
 201 amd64bsd_target (void)
 202 {
 203   struct target_ops *t;
 204
 205   t = x86bsd_target ();
 206   t->to_fetch_registers = amd64bsd_fetch_inferior_registers;
 207   t->to_store_registers = amd64bsd_store_inferior_registers;
 208   return t;
 209 }