gdb/amd64bsd-nat.c

   1 /* Native-dependent code for AMD64 BSD's.
   2
   3    Copyright (C) 2003-2014 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 "gdb_assert.h"
  28 #include <signal.h>
  29 #include <sys/types.h>
  30 #include <sys/ptrace.h>
  31 #include <machine/reg.h>
  32
  33 #include "amd64-tdep.h"
  34 #include "amd64-nat.h"
  35 #include "amd64bsd-nat.h"
  36 #include "inf-ptrace.h"
  37 \f
  38
  39 /* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this
  40    for all registers (including the floating-point registers).  */
  41
  42 static void
  43 amd64bsd_fetch_inferior_registers (struct target_ops *ops,
  44                                    struct regcache *regcache, int regnum)
  45 {
  46   struct gdbarch *gdbarch = get_regcache_arch (regcache);
  47
  48   if (regnum == -1 || amd64_native_gregset_supplies_p (gdbarch, regnum))
  49     {
  50       struct reg regs;
  51
  52       if (ptrace (PT_GETREGS, ptid_get_pid (inferior_ptid),
  53                   (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  54         perror_with_name (_("Couldn't get registers"));
  55
  56       amd64_supply_native_gregset (regcache, &regs, -1);
  57       if (regnum != -1)
  58         return;
  59     }
  60
  61   if (regnum == -1 || !amd64_native_gregset_supplies_p (gdbarch, regnum))
  62     {
  63       struct fpreg fpregs;
  64
  65       if (ptrace (PT_GETFPREGS, ptid_get_pid (inferior_ptid),
  66                   (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
  67         perror_with_name (_("Couldn't get floating point status"));
  68
  69       amd64_supply_fxsave (regcache, -1, &fpregs);
  70     }
  71 }
  72
  73 /* Store register REGNUM back into the inferior.  If REGNUM is -1, do
  74    this for all registers (including the floating-point registers).  */
  75
  76 static void
  77 amd64bsd_store_inferior_registers (struct target_ops *ops,
  78                                    struct regcache *regcache, int regnum)
  79 {
  80   struct gdbarch *gdbarch = get_regcache_arch (regcache);
  81
  82   if (regnum == -1 || amd64_native_gregset_supplies_p (gdbarch, regnum))
  83     {
  84       struct reg regs;
  85
  86       if (ptrace (PT_GETREGS, ptid_get_pid (inferior_ptid),
  87                   (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  88         perror_with_name (_("Couldn't get registers"));
  89
  90       amd64_collect_native_gregset (regcache, &regs, regnum);
  91
  92       if (ptrace (PT_SETREGS, ptid_get_pid (inferior_ptid),
  93                   (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  94         perror_with_name (_("Couldn't write registers"));
  95
  96       if (regnum != -1)
  97         return;
  98     }
  99
 100   if (regnum == -1 || !amd64_native_gregset_supplies_p (gdbarch, regnum))
 101     {
 102       struct fpreg fpregs;
 103
 104       if (ptrace (PT_GETFPREGS, ptid_get_pid (inferior_ptid),
 105                   (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 106         perror_with_name (_("Couldn't get floating point status"));
 107
 108       amd64_collect_fxsave (regcache, regnum, &fpregs);
 109
 110       if (ptrace (PT_SETFPREGS, ptid_get_pid (inferior_ptid),
 111                   (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 112         perror_with_name (_("Couldn't write floating point status"));
 113     }
 114 }
 115
 116 /* Create a prototype *BSD/amd64 target.  The client can override it
 117    with local methods.  */
 118
 119 struct target_ops *
 120 amd64bsd_target (void)
 121 {
 122   struct target_ops *t;
 123
 124   t = inf_ptrace_target ();
 125   t->to_fetch_registers = amd64bsd_fetch_inferior_registers;
 126   t->to_store_registers = amd64bsd_store_inferior_registers;
 127   return t;
 128 }
 129 \f
 130
 131 /* Support for debug registers.  */
 132
 133 #ifdef HAVE_PT_GETDBREGS
 134
 135 static unsigned long
 136 amd64bsd_dr_get (ptid_t ptid, int regnum)
 137 {
 138   struct dbreg dbregs;
 139
 140   if (ptrace (PT_GETDBREGS, ptid_get_pid (inferior_ptid),
 141               (PTRACE_TYPE_ARG3) &dbregs, 0) == -1)
 142     perror_with_name (_("Couldn't read debug registers"));
 143
 144   return DBREG_DRX ((&dbregs), regnum);
 145 }
 146
 147 static void
 148 amd64bsd_dr_set (int regnum, unsigned long value)
 149 {
 150   struct dbreg dbregs;
 151
 152   if (ptrace (PT_GETDBREGS, ptid_get_pid (inferior_ptid),
 153               (PTRACE_TYPE_ARG3) &dbregs, 0) == -1)
 154     perror_with_name (_("Couldn't get debug registers"));
 155
 156   /* For some mysterious reason, some of the reserved bits in the
 157      debug control register get set.  Mask these off, otherwise the
 158      ptrace call below will fail.  */
 159   DBREG_DRX ((&dbregs), 7) &= ~(0xffffffff0000fc00);
 160
 161   DBREG_DRX ((&dbregs), regnum) = value;
 162
 163   if (ptrace (PT_SETDBREGS, ptid_get_pid (inferior_ptid),
 164               (PTRACE_TYPE_ARG3) &dbregs, 0) == -1)
 165     perror_with_name (_("Couldn't write debug registers"));
 166 }
 167
 168 void
 169 amd64bsd_dr_set_control (unsigned long control)
 170 {
 171   amd64bsd_dr_set (7, control);
 172 }
 173
 174 void
 175 amd64bsd_dr_set_addr (int regnum, CORE_ADDR addr)
 176 {
 177   gdb_assert (regnum >= 0 && regnum <= 4);
 178
 179   amd64bsd_dr_set (regnum, addr);
 180 }
 181
 182 CORE_ADDR
 183 amd64bsd_dr_get_addr (int regnum)
 184 {
 185   return amd64bsd_dr_get (inferior_ptid, regnum);
 186 }
 187
 188 unsigned long
 189 amd64bsd_dr_get_status (void)
 190 {
 191   return amd64bsd_dr_get (inferior_ptid, 6);
 192 }
 193
 194 unsigned long
 195 amd64bsd_dr_get_control (void)
 196 {
 197   return amd64bsd_dr_get (inferior_ptid, 7);
 198 }
 199
 200 #endif /* PT_GETDBREGS */