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 static PTRACE_TYPE_RET
  40 gdb_ptrace (PTRACE_TYPE_ARG1 request, ptid_t ptid, PTRACE_TYPE_ARG3 addr,
  41             PTRACE_TYPE_ARG4 data)
  42 {
  43 #ifdef __NetBSD__
  44   gdb_assert (data == 0);
  45   /* Support for NetBSD threads: unlike other ptrace implementations in this
  46      file, NetBSD requires that we pass both the pid and lwp.  */
  47   return ptrace (request, ptid.pid (), addr, ptid.lwp ());
  48 #else
  49   pid_t pid = get_ptrace_pid (ptid);
  50   return ptrace (request, pid, addr, data);
  51 #endif
  52 }
  53
  54 /* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this
  55    for all registers (including the floating-point registers).  */
  56
  57 void
  58 amd64bsd_fetch_inferior_registers (struct regcache *regcache, int regnum)
  59 {
  60   struct gdbarch *gdbarch = regcache->arch ();
  61   ptid_t ptid = regcache->ptid ();
  62 #if defined(PT_GETFSBASE) || defined(PT_GETGSBASE)
  63   const struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
  64 #endif
  65
  66   if (regnum == -1 || amd64_native_gregset_supplies_p (gdbarch, regnum))
  67     {
  68       struct reg regs;
  69
  70       if (gdb_ptrace (PT_GETREGS, ptid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  71         perror_with_name (_("Couldn't get registers"));
  72
  73       amd64_supply_native_gregset (regcache, &regs, -1);
  74       if (regnum != -1)
  75         return;
  76     }
  77
  78 #ifdef PT_GETFSBASE
  79   if (regnum == -1 || regnum == tdep->fsbase_regnum)
  80     {
  81       register_t base;
  82
  83       if (gdb_ptrace (PT_GETFSBASE, ptid, (PTRACE_TYPE_ARG3) &base, 0) == -1)
  84         perror_with_name (_("Couldn't get segment register fs_base"));
  85
  86       regcache->raw_supply (tdep->fsbase_regnum, &base);
  87       if (regnum != -1)
  88         return;
  89     }
  90 #endif
  91 #ifdef PT_GETGSBASE
  92   if (regnum == -1 || regnum == tdep->fsbase_regnum + 1)
  93     {
  94       register_t base;
  95
  96       if (gdb_ptrace (PT_GETGSBASE, ptid, (PTRACE_TYPE_ARG3) &base, 0) == -1)
  97         perror_with_name (_("Couldn't get segment register gs_base"));
  98
  99       regcache->raw_supply (tdep->fsbase_regnum + 1, &base);
 100       if (regnum != -1)
 101         return;
 102     }
 103 #endif
 104
 105   if (regnum == -1 || !amd64_native_gregset_supplies_p (gdbarch, regnum))
 106     {
 107       struct fpreg fpregs;
 108 #ifdef PT_GETXSTATE_INFO
 109       void *xstateregs;
 110
 111       if (x86bsd_xsave_len != 0)
 112         {
 113           xstateregs = alloca (x86bsd_xsave_len);
 114           if (gdb_ptrace (PT_GETXSTATE, ptid, (PTRACE_TYPE_ARG3) xstateregs, 0)
 115               == -1)
 116             perror_with_name (_("Couldn't get extended state status"));
 117
 118           amd64_supply_xsave (regcache, -1, xstateregs);
 119           return;
 120         }
 121 #endif
 122
 123       if (gdb_ptrace (PT_GETFPREGS, ptid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 124         perror_with_name (_("Couldn't get floating point status"));
 125
 126       amd64_supply_fxsave (regcache, -1, &fpregs);
 127     }
 128 }
 129
 130 /* Store register REGNUM back into the inferior.  If REGNUM is -1, do
 131    this for all registers (including the floating-point registers).  */
 132
 133 void
 134 amd64bsd_store_inferior_registers (struct regcache *regcache, int regnum)
 135 {
 136   struct gdbarch *gdbarch = regcache->arch ();
 137   ptid_t ptid = regcache->ptid ();
 138 #if defined(PT_SETFSBASE) || defined(PT_SETGSBASE)
 139   const struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 140 #endif
 141
 142   if (regnum == -1 || amd64_native_gregset_supplies_p (gdbarch, regnum))
 143     {
 144       struct reg regs;
 145
 146       if (gdb_ptrace (PT_GETREGS, ptid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 147         perror_with_name (_("Couldn't get registers"));
 148
 149       amd64_collect_native_gregset (regcache, &regs, regnum);
 150
 151       if (gdb_ptrace (PT_SETREGS, ptid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 152         perror_with_name (_("Couldn't write registers"));
 153
 154       if (regnum != -1)
 155         return;
 156     }
 157
 158 #ifdef PT_SETFSBASE
 159   if (regnum == -1 || regnum == tdep->fsbase_regnum)
 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, &base);
 166
 167       if (gdb_ptrace (PT_SETFSBASE, ptid, (PTRACE_TYPE_ARG3) &base, 0) == -1)
 168         perror_with_name (_("Couldn't write segment register fs_base"));
 169       if (regnum != -1)
 170         return;
 171     }
 172 #endif
 173 #ifdef PT_SETGSBASE
 174   if (regnum == -1 || regnum == tdep->fsbase_regnum + 1)
 175     {
 176       register_t base;
 177
 178       /* Clear the full base value to support 32-bit targets.  */
 179       base = 0;
 180       regcache->raw_collect (tdep->fsbase_regnum + 1, &base);
 181
 182       if (gdb_ptrace (PT_SETGSBASE, ptid, (PTRACE_TYPE_ARG3) &base, 0) == -1)
 183         perror_with_name (_("Couldn't write segment register gs_base"));
 184       if (regnum != -1)
 185         return;
 186     }
 187 #endif
 188
 189   if (regnum == -1 || !amd64_native_gregset_supplies_p (gdbarch, regnum))
 190     {
 191       struct fpreg fpregs;
 192 #ifdef PT_GETXSTATE_INFO
 193       void *xstateregs;
 194
 195       if (x86bsd_xsave_len != 0)
 196         {
 197           xstateregs = alloca (x86bsd_xsave_len);
 198           if (gdb_ptrace (PT_GETXSTATE, ptid, (PTRACE_TYPE_ARG3) xstateregs, 0)
 199               == -1)
 200             perror_with_name (_("Couldn't get extended state status"));
 201
 202           amd64_collect_xsave (regcache, regnum, xstateregs, 0);
 203
 204           if (gdb_ptrace (PT_SETXSTATE, ptid, (PTRACE_TYPE_ARG3) xstateregs,
 205                           x86bsd_xsave_len) == -1)
 206             perror_with_name (_("Couldn't write extended state status"));
 207           return;
 208         }
 209 #endif
 210
 211       if (gdb_ptrace (PT_GETFPREGS, ptid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 212         perror_with_name (_("Couldn't get floating point status"));
 213
 214       amd64_collect_fxsave (regcache, regnum, &fpregs);
 215
 216       if (gdb_ptrace (PT_SETFPREGS, ptid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 217         perror_with_name (_("Couldn't write floating point status"));
 218     }
 219 }