gdb/alphabsd-nat.c

   1 /* Native-dependent code for Alpha BSD's.
   2    Copyright 2000, 2001 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       memcpy (&gregsetp->r_regs[i], &registers[REGISTER_BYTE (i)],
  84               REGISTER_RAW_SIZE (i));
  85
  86   /* The PC travels in the R_ZERO slot.  */
  87   if (regno == -1 || regno == PC_REGNUM)
  88     memcpy (&gregsetp->r_regs[R_ZERO], &registers[REGISTER_BYTE (PC_REGNUM)],
  89             REGISTER_RAW_SIZE (PC_REGNUM));
  90 }
  91
  92 /* Fill GDB's register array with the floating-point register values
  93    in *FPREGSETP.  */
  94
  95 void
  96 supply_fpregset (fpregset_t *fpregsetp)
  97 {
  98   int i;
  99
 100   for (i = FP0_REGNUM; i < FP0_REGNUM + NUM_FPREGS; i++)
 101     {
 102       if (CANNOT_FETCH_REGISTER (i))
 103         supply_register (i, NULL);
 104       else
 105         supply_register (i, (char *) &fpregsetp->fpr_regs[i - FP0_REGNUM]);
 106     }
 107
 108   supply_register (FPCR_REGNUM, (char *) &fpregsetp->fpr_cr);
 109 }
 110
 111 /* Fill register REGNO (if it is a floating-point register) in
 112    *FPREGSETP with the value in GDB's register array.  If REGNO is -1,
 113    do this for all registers.  */
 114
 115 void
 116 fill_fpregset (fpregset_t *fpregsetp, int regno)
 117 {
 118   int i;
 119
 120   for (i = FP0_REGNUM; i < FP0_REGNUM + NUM_FPREGS; i++)
 121     if ((regno == -1 || regno == i) && ! CANNOT_STORE_REGISTER (i))
 122       memcpy (&fpregsetp->fpr_regs[i - FP0_REGNUM],
 123               &registers[REGISTER_BYTE (i)], REGISTER_RAW_SIZE (i));
 124
 125   if (regno == -1 || regno == FPCR_REGNUM)
 126     memcpy (&fpregsetp->fpr_cr, &registers[REGISTER_BYTE (FPCR_REGNUM)],
 127             REGISTER_RAW_SIZE (FPCR_REGNUM));
 128 }
 129
 130 /* Fetch register REGNO from the inferior.  If REGNO is -1, do this
 131    for all registers (including the floating point registers).  */
 132
 133 void
 134 fetch_inferior_registers (int regno)
 135 {
 136   gregset_t gregs;
 137
 138   if (ptrace (PT_GETREGS, inferior_pid, (PTRACE_ARG3_TYPE) &gregs, 0) == -1)
 139     perror_with_name ("Couldn't get registers");
 140
 141   supply_gregset (&gregs);
 142
 143   if (regno == -1 || regno >= FP0_REGNUM)
 144     {
 145       fpregset_t fpregs;
 146
 147       if (ptrace (PT_GETFPREGS, inferior_pid,
 148                   (PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
 149         perror_with_name ("Couldn't get floating point status");
 150
 151       supply_fpregset (&fpregs);
 152     }
 153
 154   /* Reset virtual frame pointer.  */
 155   supply_register (FP_REGNUM, NULL);
 156 }
 157
 158 /* Store register REGNO back into the inferior.  If REGNO is -1, do
 159    this for all registers (including the floating point registers).  */
 160
 161 void
 162 store_inferior_registers (int regno)
 163 {
 164   gregset_t gregs;
 165
 166   if (ptrace (PT_GETREGS, inferior_pid, (PTRACE_ARG3_TYPE) &gregs, 0) == -1)
 167     perror_with_name ("Couldn't get registers");
 168
 169   fill_gregset (&gregs, regno);
 170
 171   if (ptrace (PT_SETREGS, inferior_pid, (PTRACE_ARG3_TYPE) &gregs, 0) == -1)
 172     perror_with_name ("Couldn't write registers");
 173
 174   if (regno == -1 || regno >= FP0_REGNUM)
 175     {
 176       fpregset_t fpregs;
 177
 178       if (ptrace (PT_GETFPREGS, inferior_pid,
 179                   (PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
 180         perror_with_name ("Couldn't get floating point status");
 181
 182       fill_fpregset (&fpregs, regno);
 183
 184       if (ptrace (PT_SETFPREGS, inferior_pid,
 185                   (PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
 186         perror_with_name ("Couldn't write floating point status");
 187     }
 188 }