gdb/mips-xdep.c

   1 /* Low level MIPS interface to ptrace, for GDB when running under Unix.
   2    Copyright (C) 1988, 1989, 1991 Free Software Foundation, Inc.
   3    Contributed by Alessandro Forin(af@cs.cmu.edu) at CMU
   4    and by Per Bothner(bothner@cs.wisc.edu) at U.Wisconsin.
   5
   6 This file is part of GDB.
   7
   8 This program is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation; either version 2 of the License, or
  11 (at your option) any later version.
  12
  13 This program is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with this program; if not, write to the Free Software
  20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  21
  22 #include <stdio.h>
  23 #ifdef sgi
  24 #include <sys/inst.h>
  25 #else
  26 #include <mips/inst.h>
  27 #endif
  28 #include "defs.h"
  29 #include "frame.h"
  30 #include "inferior.h"
  31 #include "symtab.h"
  32 #include "value.h"
  33
  34 #ifdef USG
  35 #include <sys/types.h>
  36 #endif
  37
  38 #include <sys/param.h>
  39 #include <sys/dir.h>
  40 #include <signal.h>
  41 #include <sys/ioctl.h>
  42 /* #include <fcntl.h>  Can we live without this?  */
  43
  44 #include "gdbcore.h"
  45
  46 #include <sys/user.h>           /* After a.out.h  */
  47 #include <sys/file.h>
  48 #include <sys/stat.h>
  49
  50 /* For now we stub this out; sgi format is super-hairy (and completely
  51    different in the new release) */
  52
  53 #ifdef sgi
  54 void
  55 fetch_core_registers ()
  56 {
  57   return;
  58 }
  59
  60 void
  61 fetch_inferior_registers ()
  62 {
  63   return;
  64 }
  65
  66 store_inferior_registers (regno)
  67      int regno;
  68 {
  69   return;
  70 }
  71
  72
  73 #else
  74
  75 /* Map gdb internal register number to ptrace address. */
  76
  77 #define REGISTER_PTRACE_ADDR(regno) \
  78  (regno < 32 ? regno            \
  79   : regno == PC_REGNUM ? 96     \
  80   : regno == CAUSE_REGNUM ? 97  \
  81   : regno == HI_REGNUM ? 98     \
  82   : regno == LO_REGNUM ? 99     \
  83   : regno == FCRCS_REGNUM ? 100 \
  84   : regno == FCRIR_REGNUM ? 101 \
  85   : regno >= FP0_REGNUM ? regno - (FP0_REGNUM-32)\
  86   : 0)
  87
  88 /* Get all registers from the inferior */
  89
  90 void
  91 fetch_inferior_registers ()
  92 {
  93   register int regno;
  94   register unsigned int regaddr;
  95   char buf[MAX_REGISTER_RAW_SIZE];
  96   register int i;
  97
  98   registers_fetched ();
  99
 100   for (regno = 1; regno < NUM_REGS; regno++)
 101     {
 102       regaddr = REGISTER_PTRACE_ADDR (regno);
 103       for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int))
 104         {
 105           *(int *) &buf[i] = ptrace (3, inferior_pid, regaddr, 0);
 106           regaddr += sizeof (int);
 107         }
 108       supply_register (regno, buf);
 109     }
 110 }
 111
 112 /* Store our register values back into the inferior.
 113    If REGNO is -1, do this for all registers.
 114    Otherwise, REGNO specifies which register (so we can save time).  */
 115
 116 void
 117 store_inferior_registers (regno)
 118      int regno;
 119  {
 120   register unsigned int regaddr;
 121   char buf[80];
 122
 123   if (regno == 0)
 124     return;
 125
 126   if (regno > 0)
 127     {
 128       regaddr = REGISTER_PTRACE_ADDR (regno);
 129       errno = 0;
 130       ptrace (6, inferior_pid, regaddr, read_register (regno));
 131       if (errno != 0)
 132         {
 133           sprintf (buf, "writing register number %d", regno);
 134           perror_with_name (buf);
 135         }
 136     }
 137   else
 138     {
 139       for (regno = 0; regno < NUM_REGS; regno++)
 140         {
 141           if (regno == ZERO_REGNUM || regno == PS_REGNUM
 142               || regno == BADVADDR_REGNUM || regno == CAUSE_REGNUM
 143               || regno == FCRIR_REGNUM || regno == FP_REGNUM)
 144             continue;
 145           regaddr = register_addr (regno, 1);
 146           errno = 0;
 147           ptrace (6, inferior_pid, regaddr, read_register (regno));
 148           if (errno != 0)
 149             {
 150               sprintf (buf, "writing all regs, number %d", regno);
 151               perror_with_name (buf);
 152             }
 153         }
 154     }
 155 }
 156
 157 #endif /* sgi */
 158
 159 #if 0
 160 void
 161 fetch_core_registers ()
 162 {
 163   register int regno;
 164   int val;
 165
 166   for (regno = 1; regno < NUM_REGS; regno++) {
 167     char buf[MAX_REGISTER_RAW_SIZE];
 168
 169     val = bfd_seek (core_bfd, register_addr (regno, 0));
 170     if (val < 0 || (val = bfd_read (core_bfd, buf, sizeof buf)) < 0) {
 171       char buffer[50];
 172       strcpy (buffer, "Reading register ");
 173       strcat (buffer, reg_names[regno]);
 174
 175       perror_with_name (buffer);
 176     }
 177     supply_register (regno, buf);
 178   }
 179 }
 180 #endif /* 0 */