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
  47   if (regnum == -1 || amd64_native_gregset_supplies_p (gdbarch, regnum))
  48     {
  49       struct reg regs;
  50
  51       if (ptrace (PT_GETREGS, get_ptrace_pid (inferior_ptid),
  52                   (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, get_ptrace_pid (inferior_ptid),
  70                       (PTRACE_TYPE_ARG3) xstateregs, 0) == -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, get_ptrace_pid (inferior_ptid),
  79                   (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
  80         perror_with_name (_("Couldn't get floating point status"));
  81
  82       amd64_supply_fxsave (regcache, -1, &fpregs);
  83     }
  84 }
  85
  86 /* Store register REGNUM back into the inferior.  If REGNUM is -1, do
  87    this for all registers (including the floating-point registers).  */
  88
  89 static void
  90 amd64bsd_store_inferior_registers (struct target_ops *ops,
  91                                    struct regcache *regcache, int regnum)
  92 {
  93   struct gdbarch *gdbarch = get_regcache_arch (regcache);
  94
  95   if (regnum == -1 || amd64_native_gregset_supplies_p (gdbarch, regnum))
  96     {
  97       struct reg regs;
  98
  99       if (ptrace (PT_GETREGS, get_ptrace_pid (inferior_ptid),
 100                   (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 101         perror_with_name (_("Couldn't get registers"));
 102
 103       amd64_collect_native_gregset (regcache, &regs, regnum);
 104
 105       if (ptrace (PT_SETREGS, get_ptrace_pid (inferior_ptid),
 106                   (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 107         perror_with_name (_("Couldn't write registers"));
 108
 109       if (regnum != -1)
 110         return;
 111     }
 112
 113   if (regnum == -1 || !amd64_native_gregset_supplies_p (gdbarch, regnum))
 114     {
 115       struct fpreg fpregs;
 116 #ifdef PT_GETXSTATE_INFO
 117       void *xstateregs;
 118
 119       if (x86bsd_xsave_len != 0)
 120         {
 121           xstateregs = alloca (x86bsd_xsave_len);
 122           if (ptrace (PT_GETXSTATE, get_ptrace_pid (inferior_ptid),
 123                       (PTRACE_TYPE_ARG3) xstateregs, 0) == -1)
 124             perror_with_name (_("Couldn't get extended state status"));
 125
 126           amd64_collect_xsave (regcache, regnum, xstateregs, 0);
 127
 128           if (ptrace (PT_SETXSTATE, get_ptrace_pid (inferior_ptid),
 129                       (PTRACE_TYPE_ARG3) xstateregs, x86bsd_xsave_len) == -1)
 130             perror_with_name (_("Couldn't write extended state status"));
 131           return;
 132         }
 133 #endif
 134
 135       if (ptrace (PT_GETFPREGS, get_ptrace_pid (inferior_ptid),
 136                   (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 137         perror_with_name (_("Couldn't get floating point status"));
 138
 139       amd64_collect_fxsave (regcache, regnum, &fpregs);
 140
 141       if (ptrace (PT_SETFPREGS, get_ptrace_pid (inferior_ptid),
 142                   (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 143         perror_with_name (_("Couldn't write floating point status"));
 144     }
 145 }
 146
 147 /* Create a prototype *BSD/amd64 target.  The client can override it
 148    with local methods.  */
 149
 150 struct target_ops *
 151 amd64bsd_target (void)
 152 {
 153   struct target_ops *t;
 154
 155   t = x86bsd_target ();
 156   t->to_fetch_registers = amd64bsd_fetch_inferior_registers;
 157   t->to_store_registers = amd64bsd_store_inferior_registers;
 158   return t;
 159 }