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 #ifdef PT_GETXSTATE_INFO
  39 size_t amd64bsd_xsave_len;
  40 #endif
  41
  42 /* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this
  43    for all registers (including the floating-point registers).  */
  44
  45 static void
  46 amd64bsd_fetch_inferior_registers (struct target_ops *ops,
  47                                    struct regcache *regcache, int regnum)
  48 {
  49   struct gdbarch *gdbarch = get_regcache_arch (regcache);
  50
  51   if (regnum == -1 || amd64_native_gregset_supplies_p (gdbarch, regnum))
  52     {
  53       struct reg regs;
  54
  55       if (ptrace (PT_GETREGS, ptid_get_pid (inferior_ptid),
  56                   (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  57         perror_with_name (_("Couldn't get registers"));
  58
  59       amd64_supply_native_gregset (regcache, &regs, -1);
  60       if (regnum != -1)
  61         return;
  62     }
  63
  64   if (regnum == -1 || !amd64_native_gregset_supplies_p (gdbarch, regnum))
  65     {
  66       struct fpreg fpregs;
  67 #ifdef PT_GETXSTATE_INFO
  68       char *xstateregs;
  69
  70       if (amd64bsd_xsave_len != 0)
  71         {
  72           xstateregs = alloca (amd64bsd_xsave_len);
  73           if (ptrace (PT_GETXSTATE, ptid_get_pid (inferior_ptid),
  74                       (PTRACE_TYPE_ARG3) xstateregs, 0) == -1)
  75             perror_with_name (_("Couldn't get extended state status"));
  76
  77           amd64_supply_xsave (regcache, -1, xstateregs);
  78           return;
  79         }
  80 #endif
  81
  82       if (ptrace (PT_GETFPREGS, ptid_get_pid (inferior_ptid),
  83                   (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
  84         perror_with_name (_("Couldn't get floating point status"));
  85
  86       amd64_supply_fxsave (regcache, -1, &fpregs);
  87     }
  88 }
  89
  90 /* Store register REGNUM back into the inferior.  If REGNUM is -1, do
  91    this for all registers (including the floating-point registers).  */
  92
  93 static void
  94 amd64bsd_store_inferior_registers (struct target_ops *ops,
  95                                    struct regcache *regcache, int regnum)
  96 {
  97   struct gdbarch *gdbarch = get_regcache_arch (regcache);
  98
  99   if (regnum == -1 || amd64_native_gregset_supplies_p (gdbarch, regnum))
 100     {
 101       struct reg regs;
 102
 103       if (ptrace (PT_GETREGS, ptid_get_pid (inferior_ptid),
 104                   (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 105         perror_with_name (_("Couldn't get registers"));
 106
 107       amd64_collect_native_gregset (regcache, &regs, regnum);
 108
 109       if (ptrace (PT_SETREGS, ptid_get_pid (inferior_ptid),
 110                   (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 111         perror_with_name (_("Couldn't write registers"));
 112
 113       if (regnum != -1)
 114         return;
 115     }
 116
 117   if (regnum == -1 || !amd64_native_gregset_supplies_p (gdbarch, regnum))
 118     {
 119       struct fpreg fpregs;
 120 #ifdef PT_GETXSTATE_INFO
 121       char *xstateregs;
 122
 123       if (amd64bsd_xsave_len != 0)
 124         {
 125           xstateregs = alloca (amd64bsd_xsave_len);
 126           if (ptrace (PT_GETXSTATE, ptid_get_pid (inferior_ptid),
 127                       (PTRACE_TYPE_ARG3) xstateregs, 0) == -1)
 128             perror_with_name (_("Couldn't get extended state status"));
 129
 130           amd64_collect_xsave (regcache, regnum, xstateregs, 0);
 131
 132           if (ptrace (PT_SETXSTATE, ptid_get_pid (inferior_ptid),
 133                       (PTRACE_TYPE_ARG3) xstateregs, amd64bsd_xsave_len) == -1)
 134             perror_with_name (_("Couldn't write extended state status"));
 135           return;
 136         }
 137 #endif
 138
 139       if (ptrace (PT_GETFPREGS, ptid_get_pid (inferior_ptid),
 140                   (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 141         perror_with_name (_("Couldn't get floating point status"));
 142
 143       amd64_collect_fxsave (regcache, regnum, &fpregs);
 144
 145       if (ptrace (PT_SETFPREGS, ptid_get_pid (inferior_ptid),
 146                   (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 147         perror_with_name (_("Couldn't write floating point status"));
 148     }
 149 }
 150
 151 /* Create a prototype *BSD/amd64 target.  The client can override it
 152    with local methods.  */
 153
 154 struct target_ops *
 155 amd64bsd_target (void)
 156 {
 157   struct target_ops *t;
 158
 159   t = inf_ptrace_target ();
 160   t->to_fetch_registers = amd64bsd_fetch_inferior_registers;
 161   t->to_store_registers = amd64bsd_store_inferior_registers;
 162   return t;
 163 }
 164 \f
 165
 166 /* Support for debug registers.  */
 167
 168 #ifdef HAVE_PT_GETDBREGS
 169
 170 static unsigned long
 171 amd64bsd_dr_get (ptid_t ptid, int regnum)
 172 {
 173   struct dbreg dbregs;
 174
 175   if (ptrace (PT_GETDBREGS, ptid_get_pid (inferior_ptid),
 176               (PTRACE_TYPE_ARG3) &dbregs, 0) == -1)
 177     perror_with_name (_("Couldn't read debug registers"));
 178
 179   return DBREG_DRX ((&dbregs), regnum);
 180 }
 181
 182 static void
 183 amd64bsd_dr_set (int regnum, unsigned long value)
 184 {
 185   struct dbreg dbregs;
 186
 187   if (ptrace (PT_GETDBREGS, ptid_get_pid (inferior_ptid),
 188               (PTRACE_TYPE_ARG3) &dbregs, 0) == -1)
 189     perror_with_name (_("Couldn't get debug registers"));
 190
 191   /* For some mysterious reason, some of the reserved bits in the
 192      debug control register get set.  Mask these off, otherwise the
 193      ptrace call below will fail.  */
 194   DBREG_DRX ((&dbregs), 7) &= ~(0xffffffff0000fc00);
 195
 196   DBREG_DRX ((&dbregs), regnum) = value;
 197
 198   if (ptrace (PT_SETDBREGS, ptid_get_pid (inferior_ptid),
 199               (PTRACE_TYPE_ARG3) &dbregs, 0) == -1)
 200     perror_with_name (_("Couldn't write debug registers"));
 201 }
 202
 203 void
 204 amd64bsd_dr_set_control (unsigned long control)
 205 {
 206   amd64bsd_dr_set (7, control);
 207 }
 208
 209 void
 210 amd64bsd_dr_set_addr (int regnum, CORE_ADDR addr)
 211 {
 212   gdb_assert (regnum >= 0 && regnum <= 4);
 213
 214   amd64bsd_dr_set (regnum, addr);
 215 }
 216
 217 CORE_ADDR
 218 amd64bsd_dr_get_addr (int regnum)
 219 {
 220   return amd64bsd_dr_get (inferior_ptid, regnum);
 221 }
 222
 223 unsigned long
 224 amd64bsd_dr_get_status (void)
 225 {
 226   return amd64bsd_dr_get (inferior_ptid, 6);
 227 }
 228
 229 unsigned long
 230 amd64bsd_dr_get_control (void)
 231 {
 232   return amd64bsd_dr_get (inferior_ptid, 7);
 233 }
 234
 235 #endif /* PT_GETDBREGS */