gdb/amd64bsd-nat.c

   1 /* Native-dependent code for AMD64 BSD's.
   2
   3    Copyright (C) 2003-2015 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 "amd64bsd-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, ptid_get_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
  64       if (ptrace (PT_GETFPREGS, ptid_get_pid (inferior_ptid),
  65                   (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
  66         perror_with_name (_("Couldn't get floating point status"));
  67
  68       amd64_supply_fxsave (regcache, -1, &fpregs);
  69     }
  70 }
  71
  72 /* Store register REGNUM back into the inferior.  If REGNUM is -1, do
  73    this for all registers (including the floating-point registers).  */
  74
  75 static void
  76 amd64bsd_store_inferior_registers (struct target_ops *ops,
  77                                    struct regcache *regcache, int regnum)
  78 {
  79   struct gdbarch *gdbarch = get_regcache_arch (regcache);
  80
  81   if (regnum == -1 || amd64_native_gregset_supplies_p (gdbarch, regnum))
  82     {
  83       struct reg regs;
  84
  85       if (ptrace (PT_GETREGS, ptid_get_pid (inferior_ptid),
  86                   (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  87         perror_with_name (_("Couldn't get registers"));
  88
  89       amd64_collect_native_gregset (regcache, &regs, regnum);
  90
  91       if (ptrace (PT_SETREGS, ptid_get_pid (inferior_ptid),
  92                   (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  93         perror_with_name (_("Couldn't write registers"));
  94
  95       if (regnum != -1)
  96         return;
  97     }
  98
  99   if (regnum == -1 || !amd64_native_gregset_supplies_p (gdbarch, regnum))
 100     {
 101       struct fpreg fpregs;
 102
 103       if (ptrace (PT_GETFPREGS, ptid_get_pid (inferior_ptid),
 104                   (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 105         perror_with_name (_("Couldn't get floating point status"));
 106
 107       amd64_collect_fxsave (regcache, regnum, &fpregs);
 108
 109       if (ptrace (PT_SETFPREGS, ptid_get_pid (inferior_ptid),
 110                   (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 111         perror_with_name (_("Couldn't write floating point status"));
 112     }
 113 }
 114
 115 /* Create a prototype *BSD/amd64 target.  The client can override it
 116    with local methods.  */
 117
 118 struct target_ops *
 119 amd64bsd_target (void)
 120 {
 121   struct target_ops *t;
 122
 123   t = inf_ptrace_target ();
 124   t->to_fetch_registers = amd64bsd_fetch_inferior_registers;
 125   t->to_store_registers = amd64bsd_store_inferior_registers;
 126   return t;
 127 }
 128 \f
 129
 130 /* Support for debug registers.  */
 131
 132 #ifdef HAVE_PT_GETDBREGS
 133
 134 static unsigned long
 135 amd64bsd_dr_get (ptid_t ptid, int regnum)
 136 {
 137   struct dbreg dbregs;
 138
 139   if (ptrace (PT_GETDBREGS, ptid_get_pid (inferior_ptid),
 140               (PTRACE_TYPE_ARG3) &dbregs, 0) == -1)
 141     perror_with_name (_("Couldn't read debug registers"));
 142
 143   return DBREG_DRX ((&dbregs), regnum);
 144 }
 145
 146 static void
 147 amd64bsd_dr_set (int regnum, unsigned long value)
 148 {
 149   struct dbreg dbregs;
 150
 151   if (ptrace (PT_GETDBREGS, ptid_get_pid (inferior_ptid),
 152               (PTRACE_TYPE_ARG3) &dbregs, 0) == -1)
 153     perror_with_name (_("Couldn't get debug registers"));
 154
 155   /* For some mysterious reason, some of the reserved bits in the
 156      debug control register get set.  Mask these off, otherwise the
 157      ptrace call below will fail.  */
 158   DBREG_DRX ((&dbregs), 7) &= ~(0xffffffff0000fc00);
 159
 160   DBREG_DRX ((&dbregs), regnum) = value;
 161
 162   if (ptrace (PT_SETDBREGS, ptid_get_pid (inferior_ptid),
 163               (PTRACE_TYPE_ARG3) &dbregs, 0) == -1)
 164     perror_with_name (_("Couldn't write debug registers"));
 165 }
 166
 167 void
 168 amd64bsd_dr_set_control (unsigned long control)
 169 {
 170   amd64bsd_dr_set (7, control);
 171 }
 172
 173 void
 174 amd64bsd_dr_set_addr (int regnum, CORE_ADDR addr)
 175 {
 176   gdb_assert (regnum >= 0 && regnum <= 4);
 177
 178   amd64bsd_dr_set (regnum, addr);
 179 }
 180
 181 CORE_ADDR
 182 amd64bsd_dr_get_addr (int regnum)
 183 {
 184   return amd64bsd_dr_get (inferior_ptid, regnum);
 185 }
 186
 187 unsigned long
 188 amd64bsd_dr_get_status (void)
 189 {
 190   return amd64bsd_dr_get (inferior_ptid, 6);
 191 }
 192
 193 unsigned long
 194 amd64bsd_dr_get_control (void)
 195 {
 196   return amd64bsd_dr_get (inferior_ptid, 7);
 197 }
 198
 199 #endif /* PT_GETDBREGS */