gdb/amd64-bsd-nat.c

   1 /* Native-dependent code for AMD64 BSD's.
   2
   3    Copyright (C) 2003-2017 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 = get_regcache_arch (regcache);
  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   if (regnum == -1 || !amd64_native_gregset_supplies_p (gdbarch, regnum))
  61     {
  62       struct fpreg fpregs;
  63 #ifdef PT_GETXSTATE_INFO
  64       void *xstateregs;
  65
  66       if (x86bsd_xsave_len != 0)
  67         {
  68           xstateregs = alloca (x86bsd_xsave_len);
  69           if (ptrace (PT_GETXSTATE, pid, (PTRACE_TYPE_ARG3) xstateregs, 0)
  70               == -1)
  71             perror_with_name (_("Couldn't get extended state status"));
  72
  73           amd64_supply_xsave (regcache, -1, xstateregs);
  74           return;
  75         }
  76 #endif
  77
  78       if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
  79         perror_with_name (_("Couldn't get floating point status"));
  80
  81       amd64_supply_fxsave (regcache, -1, &fpregs);
  82     }
  83 }
  84
  85 /* Store register REGNUM back into the inferior.  If REGNUM is -1, do
  86    this for all registers (including the floating-point registers).  */
  87
  88 static void
  89 amd64bsd_store_inferior_registers (struct target_ops *ops,
  90                                    struct regcache *regcache, int regnum)
  91 {
  92   struct gdbarch *gdbarch = get_regcache_arch (regcache);
  93   pid_t pid = get_ptrace_pid (regcache_get_ptid (regcache));
  94
  95   if (regnum == -1 || amd64_native_gregset_supplies_p (gdbarch, regnum))
  96     {
  97       struct reg regs;
  98
  99       if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 100         perror_with_name (_("Couldn't get registers"));
 101
 102       amd64_collect_native_gregset (regcache, &regs, regnum);
 103
 104       if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 105         perror_with_name (_("Couldn't write registers"));
 106
 107       if (regnum != -1)
 108         return;
 109     }
 110
 111   if (regnum == -1 || !amd64_native_gregset_supplies_p (gdbarch, regnum))
 112     {
 113       struct fpreg fpregs;
 114 #ifdef PT_GETXSTATE_INFO
 115       void *xstateregs;
 116
 117       if (x86bsd_xsave_len != 0)
 118         {
 119           xstateregs = alloca (x86bsd_xsave_len);
 120           if (ptrace (PT_GETXSTATE, pid, (PTRACE_TYPE_ARG3) xstateregs, 0)
 121               == -1)
 122             perror_with_name (_("Couldn't get extended state status"));
 123
 124           amd64_collect_xsave (regcache, regnum, xstateregs, 0);
 125
 126           if (ptrace (PT_SETXSTATE, pid, (PTRACE_TYPE_ARG3) xstateregs,
 127                       x86bsd_xsave_len) == -1)
 128             perror_with_name (_("Couldn't write extended state status"));
 129           return;
 130         }
 131 #endif
 132
 133       if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 134         perror_with_name (_("Couldn't get floating point status"));
 135
 136       amd64_collect_fxsave (regcache, regnum, &fpregs);
 137
 138       if (ptrace (PT_SETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 139         perror_with_name (_("Couldn't write floating point status"));
 140     }
 141 }
 142
 143 /* Create a prototype *BSD/amd64 target.  The client can override it
 144    with local methods.  */
 145
 146 struct target_ops *
 147 amd64bsd_target (void)
 148 {
 149   struct target_ops *t;
 150
 151   t = x86bsd_target ();
 152   t->to_fetch_registers = amd64bsd_fetch_inferior_registers;
 153   t->to_store_registers = amd64bsd_store_inferior_registers;
 154   return t;
 155 }