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