gdb/alphabsd-nat.c

   1 /* Native-dependent code for Alpha BSD's.
   2    Copyright 2000, 2001, 2002 Free Software Foundation, Inc.
   3
   4    This file is part of GDB.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, USA.  */
  20
  21 #include "defs.h"
  22 #include "inferior.h"
  23 #include "regcache.h"
  24
  25 #include <sys/types.h>
  26 #include <sys/ptrace.h>
  27 #include <machine/reg.h>
  28
  29 #ifdef HAVE_SYS_PROCFS_H
  30 #include <sys/procfs.h>
  31 #endif
  32
  33 #ifndef HAVE_GREGSET_T
  34 typedef struct reg gregset_t;
  35 #endif
  36
  37 #ifndef HAVE_FPREGSET_T
  38 typedef struct fpreg fpregset_t;
  39 #endif
  40
  41 #include "gregset.h"
  42
  43 /* Number of general-purpose registers.  */
  44 #define NUM_GREGS  32
  45
  46 /* Number of floating point registers.  */
  47 #define NUM_FPREGS 31
  48 \f
  49
  50 /* Transfering the registers between GDB, inferiors and core files.  */
  51
  52 /* Fill GDB's register array with the general-purpose register values
  53    in *GREGSETP.  */
  54
  55 void
  56 supply_gregset (gregset_t *gregsetp)
  57 {
  58   int i;
  59
  60   for (i = 0; i < NUM_GREGS; i++)
  61     {
  62       if (CANNOT_FETCH_REGISTER (i))
  63         supply_register (i, NULL);
  64       else
  65         supply_register (i, (char *) &gregsetp->r_regs[i]);
  66     }
  67
  68   /* The PC travels in the R_ZERO slot.  */
  69   supply_register (PC_REGNUM, (char *) &gregsetp->r_regs[R_ZERO]);
  70 }
  71
  72 /* Fill register REGNO (if it is a general-purpose register) in
  73    *GREGSETPS with the value in GDB's register array.  If REGNO is -1,
  74    do this for all registers.  */
  75
  76 void
  77 fill_gregset (gregset_t *gregsetp, int regno)
  78 {
  79   int i;
  80
  81   for (i = 0; i < NUM_GREGS; i++)
  82     if ((regno == -1 || regno == i) && ! CANNOT_STORE_REGISTER (i))
  83       regcache_collect (i, (char *) &gregsetp->r_regs[i]);
  84
  85   /* The PC travels in the R_ZERO slot.  */
  86   if (regno == -1 || regno == PC_REGNUM)
  87     regcache_collect (PC_REGNUM, (char *) &gregsetp->r_regs[R_ZERO]);
  88 }
  89
  90 /* Fill GDB's register array with the floating-point register values
  91    in *FPREGSETP.  */
  92
  93 void
  94 supply_fpregset (fpregset_t *fpregsetp)
  95 {
  96   int i;
  97
  98   for (i = FP0_REGNUM; i < FP0_REGNUM + NUM_FPREGS; i++)
  99     {
 100       if (CANNOT_FETCH_REGISTER (i))
 101         supply_register (i, NULL);
 102       else
 103         supply_register (i, (char *) &fpregsetp->fpr_regs[i - FP0_REGNUM]);
 104     }
 105
 106   supply_register (FPCR_REGNUM, (char *) &fpregsetp->fpr_cr);
 107 }
 108
 109 /* Fill register REGNO (if it is a floating-point register) in
 110    *FPREGSETP with the value in GDB's register array.  If REGNO is -1,
 111    do this for all registers.  */
 112
 113 void
 114 fill_fpregset (fpregset_t *fpregsetp, int regno)
 115 {
 116   int i;
 117
 118   for (i = FP0_REGNUM; i < FP0_REGNUM + NUM_FPREGS; i++)
 119     if ((regno == -1 || regno == i) && ! CANNOT_STORE_REGISTER (i))
 120       regcache_collect (i, (char *) &fpregsetp->fpr_regs[i - FP0_REGNUM]);
 121
 122   if (regno == -1 || regno == FPCR_REGNUM)
 123     regcache_collect (FPCR_REGNUM, (char *) &fpregsetp->fpr_cr);
 124 }
 125
 126
 127 /* Determine if PT_GETREGS fetches this register.  */
 128
 129 static int
 130 getregs_supplies (int regno)
 131 {
 132
 133   return ((regno >= V0_REGNUM && regno <= ZERO_REGNUM)
 134           || regno >= PC_REGNUM);
 135 }
 136
 137
 138 /* Fetch register REGNO from the inferior.  If REGNO is -1, do this
 139    for all registers (including the floating point registers).  */
 140
 141 void
 142 fetch_inferior_registers (int regno)
 143 {
 144
 145   if (regno == -1 || getregs_supplies (regno))
 146     {
 147       gregset_t gregs;
 148
 149       if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
 150                   (PTRACE_ARG3_TYPE) &gregs, 0) == -1)
 151         perror_with_name ("Couldn't get registers");
 152
 153       supply_gregset (&gregs);
 154       if (regno != -1)
 155         return;
 156     }
 157
 158   if (regno == -1 || regno >= FP0_REGNUM)
 159     {
 160       fpregset_t fpregs;
 161
 162       if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
 163                   (PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
 164         perror_with_name ("Couldn't get floating point status");
 165
 166       supply_fpregset (&fpregs);
 167     }
 168
 169   /* Reset virtual frame pointer.  */
 170   supply_register (FP_REGNUM, NULL);
 171 }
 172
 173 /* Store register REGNO back into the inferior.  If REGNO is -1, do
 174    this for all registers (including the floating point registers).  */
 175
 176 void
 177 store_inferior_registers (int regno)
 178 {
 179
 180   if (regno == -1 || getregs_supplies (regno))
 181     {
 182       gregset_t gregs;
 183       if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
 184                   (PTRACE_ARG3_TYPE) &gregs, 0) == -1)
 185         perror_with_name ("Couldn't get registers");
 186
 187       fill_gregset (&gregs, regno);
 188
 189       if (ptrace (PT_SETREGS, PIDGET (inferior_ptid),
 190                   (PTRACE_ARG3_TYPE) &gregs, 0) == -1)
 191         perror_with_name ("Couldn't write registers");
 192
 193       if (regno != -1)
 194         return;
 195     }
 196
 197   if (regno == -1 || regno >= FP0_REGNUM)
 198     {
 199       fpregset_t fpregs;
 200
 201       if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
 202                   (PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
 203         perror_with_name ("Couldn't get floating point status");
 204
 205       fill_fpregset (&fpregs, regno);
 206
 207       if (ptrace (PT_SETFPREGS, PIDGET (inferior_ptid),
 208                   (PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
 209         perror_with_name ("Couldn't write floating point status");
 210     }
 211 }