gdb/alphabsd-nat.c

   1 /* Native-dependent code for Alpha BSD's.
   2
   3    Copyright (C) 2000, 2001, 2002, 2004, 2005 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 2 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, write to the Free Software
  19    Foundation, Inc., 51 Franklin Street, Fifth Floor,
  20    Boston, MA 02110-1301, USA.  */
  21
  22 #include "defs.h"
  23 #include "inferior.h"
  24 #include "regcache.h"
  25
  26 #include "alpha-tdep.h"
  27 #include "alphabsd-tdep.h"
  28 #include "inf-ptrace.h"
  29
  30 #include <sys/types.h>
  31 #include <sys/ptrace.h>
  32 #include <machine/reg.h>
  33
  34 #ifdef HAVE_SYS_PROCFS_H
  35 #include <sys/procfs.h>
  36 #endif
  37
  38 #ifndef HAVE_GREGSET_T
  39 typedef struct reg gregset_t;
  40 #endif
  41
  42 #ifndef HAVE_FPREGSET_T
  43 typedef struct fpreg fpregset_t;
  44 #endif
  45
  46 #include "gregset.h"
  47
  48 /* Provide *regset() wrappers around the generic Alpha BSD register
  49    supply/fill routines.  */
  50
  51 void
  52 supply_gregset (gregset_t *gregsetp)
  53 {
  54   alphabsd_supply_reg ((char *) gregsetp, -1);
  55 }
  56
  57 void
  58 fill_gregset (gregset_t *gregsetp, int regno)
  59 {
  60   alphabsd_fill_reg ((char *) gregsetp, regno);
  61 }
  62
  63 void
  64 supply_fpregset (fpregset_t *fpregsetp)
  65 {
  66   alphabsd_supply_fpreg ((char *) fpregsetp, -1);
  67 }
  68
  69 void
  70 fill_fpregset (fpregset_t *fpregsetp, int regno)
  71 {
  72   alphabsd_fill_fpreg ((char *) fpregsetp, regno);
  73 }
  74 \f
  75 /* Determine if PT_GETREGS fetches this register.  */
  76
  77 static int
  78 getregs_supplies (int regno)
  79 {
  80   return ((regno >= ALPHA_V0_REGNUM && regno <= ALPHA_ZERO_REGNUM)
  81           || regno >= ALPHA_PC_REGNUM);
  82 }
  83
  84 /* Fetch register REGNO from the inferior.  If REGNO is -1, do this
  85    for all registers (including the floating point registers).  */
  86
  87 static void
  88 alphabsd_fetch_inferior_registers (int regno)
  89 {
  90   if (regno == -1 || getregs_supplies (regno))
  91     {
  92       struct reg gregs;
  93
  94       if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
  95                   (PTRACE_TYPE_ARG3) &gregs, 0) == -1)
  96         perror_with_name (_("Couldn't get registers"));
  97
  98       alphabsd_supply_reg ((char *) &gregs, regno);
  99       if (regno != -1)
 100         return;
 101     }
 102
 103   if (regno == -1 || regno >= FP0_REGNUM)
 104     {
 105       struct fpreg fpregs;
 106
 107       if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
 108                   (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 109         perror_with_name (_("Couldn't get floating point status"));
 110
 111       alphabsd_supply_fpreg ((char *) &fpregs, regno);
 112     }
 113 }
 114
 115 /* Store register REGNO back into the inferior.  If REGNO is -1, do
 116    this for all registers (including the floating point registers).  */
 117
 118 static void
 119 alphabsd_store_inferior_registers (int regno)
 120 {
 121   if (regno == -1 || getregs_supplies (regno))
 122     {
 123       struct reg gregs;
 124       if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
 125                   (PTRACE_TYPE_ARG3) &gregs, 0) == -1)
 126         perror_with_name (_("Couldn't get registers"));
 127
 128       alphabsd_fill_reg ((char *) &gregs, regno);
 129
 130       if (ptrace (PT_SETREGS, PIDGET (inferior_ptid),
 131                   (PTRACE_TYPE_ARG3) &gregs, 0) == -1)
 132         perror_with_name (_("Couldn't write registers"));
 133
 134       if (regno != -1)
 135         return;
 136     }
 137
 138   if (regno == -1 || regno >= FP0_REGNUM)
 139     {
 140       struct fpreg fpregs;
 141
 142       if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
 143                   (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 144         perror_with_name (_("Couldn't get floating point status"));
 145
 146       alphabsd_fill_fpreg ((char *) &fpregs, regno);
 147
 148       if (ptrace (PT_SETFPREGS, PIDGET (inferior_ptid),
 149                   (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 150         perror_with_name (_("Couldn't write floating point status"));
 151     }
 152 }
 153
 154 /* Provide a prototype to silence -Wmissing-prototypes.  */
 155 void _initialize_alphabsd_nat (void);
 156
 157 void
 158 _initialize_alphabsd_nat (void)
 159 {
 160   struct target_ops *t;
 161
 162   t = inf_ptrace_target ();
 163   t->to_fetch_registers = alphabsd_fetch_inferior_registers;
 164   t->to_store_registers = alphabsd_store_inferior_registers;
 165   add_target (t);
 166 }