gdb/mips-xdep.c

   1 /* Low level MIPS interface to ptrace, for GDB when running under Unix.
   2    Copyright 1988, 1989, 1991, 1992 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 "defs.h"
  23 #ifdef sgi
  24 #include <sys/inst.h>
  25 #else
  26 #include <mips/inst.h>
  27 #endif
  28 #include "frame.h"
  29 #include "inferior.h"
  30 #include "symtab.h"
  31 #include "value.h"
  32
  33 #ifdef USG
  34 #include <sys/types.h>
  35 #endif
  36
  37 #include <sys/param.h>
  38 #include <sys/dir.h>
  39 #include <signal.h>
  40 #include <sys/ioctl.h>
  41 /* #include <fcntl.h>  Can we live without this?  */
  42
  43 #include "gdbcore.h"
  44
  45 #include <sys/user.h>           /* After a.out.h  */
  46 #include <sys/file.h>
  47 #include <sys/stat.h>
  48
  49 /* For now we stub this out; sgi format is super-hairy (and completely
  50    different in the new release) */
  51
  52 #ifdef sgi
  53 void
  54 fetch_core_registers ()
  55 {
  56   return;
  57 }
  58
  59 /* ARGSUSED */
  60 void
  61 fetch_inferior_registers (regno)
  62      int regno;
  63 {
  64   return;
  65 }
  66
  67 /* ARGSUSED */
  68 void
  69 store_inferior_registers (regno)
  70      int regno;
  71 {
  72   return;
  73 }
  74
  75
  76 #else
  77
  78 /* Map gdb internal register number to ptrace address. */
  79
  80 #define REGISTER_PTRACE_ADDR(regno) \
  81  (regno < 32 ? regno            \
  82   : regno == PC_REGNUM ? 96     \
  83   : regno == CAUSE_REGNUM ? 97  \
  84   : regno == HI_REGNUM ? 98     \
  85   : regno == LO_REGNUM ? 99     \
  86   : regno == FCRCS_REGNUM ? 100 \
  87   : regno == FCRIR_REGNUM ? 101 \
  88   : regno >= FP0_REGNUM ? regno - (FP0_REGNUM-32)\
  89   : 0)
  90
  91 /* Get all registers from the inferior */
  92
  93 void
  94 fetch_inferior_registers (regno)
  95      int regno;
  96 {
  97   register unsigned int regaddr;
  98   char buf[MAX_REGISTER_RAW_SIZE];
  99   register int i;
 100
 101   registers_fetched ();
 102
 103   for (regno = 1; regno < NUM_REGS; regno++)
 104     {
 105       regaddr = REGISTER_PTRACE_ADDR (regno);
 106       for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int))
 107         {
 108           *(int *) &buf[i] = ptrace (3, inferior_pid, regaddr, 0);
 109           regaddr += sizeof (int);
 110         }
 111       supply_register (regno, buf);
 112     }
 113 }
 114
 115 /* Store our register values back into the inferior.
 116    If REGNO is -1, do this for all registers.
 117    Otherwise, REGNO specifies which register (so we can save time).  */
 118
 119 void
 120 store_inferior_registers (regno)
 121      int regno;
 122  {
 123   register unsigned int regaddr;
 124   char buf[80];
 125
 126   if (regno == 0)
 127     return;
 128
 129   if (regno > 0)
 130     {
 131       regaddr = REGISTER_PTRACE_ADDR (regno);
 132       errno = 0;
 133       ptrace (6, inferior_pid, regaddr, read_register (regno));
 134       if (errno != 0)
 135         {
 136           sprintf (buf, "writing register number %d", regno);
 137           perror_with_name (buf);
 138         }
 139     }
 140   else
 141     {
 142       for (regno = 0; regno < NUM_REGS; regno++)
 143         {
 144           if (regno == ZERO_REGNUM || regno == PS_REGNUM
 145               || regno == BADVADDR_REGNUM || regno == CAUSE_REGNUM
 146               || regno == FCRIR_REGNUM || regno == FP_REGNUM
 147               || (regno >= FIRST_EMBED_REGNUM && regno <= LAST_EMBED_REGNUM))
 148             continue;
 149           regaddr = register_addr (regno, 1);
 150           errno = 0;
 151           ptrace (6, inferior_pid, regaddr, read_register (regno));
 152           if (errno != 0)
 153             {
 154               sprintf (buf, "writing all regs, number %d", regno);
 155               perror_with_name (buf);
 156             }
 157         }
 158     }
 159 }
 160
 161 #endif /* sgi */
 162
 163 #if 0
 164 void
 165 fetch_core_registers ()
 166 {
 167   register int regno;
 168   int val;
 169
 170   for (regno = 1; regno < NUM_REGS; regno++) {
 171     char buf[MAX_REGISTER_RAW_SIZE];
 172
 173     val = bfd_seek (core_bfd, register_addr (regno, 0));
 174     if (val < 0 || (val = bfd_read (core_bfd, buf, sizeof buf)) < 0) {
 175       char buffer[50];
 176       strcpy (buffer, "Reading register ");
 177       strcat (buffer, reg_names[regno]);
 178
 179       perror_with_name (buffer);
 180     }
 181     supply_register (regno, buf);
 182   }
 183 }
 184 #endif /* 0 */