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 #include "inferior.h"
  24 #include "gdbcore.h"
  25
  26 /* For now we stub this out; sgi core format is super-hairy (and completely
  27    different in the new release).
  28    For most mips systems, this function is defined in coredep.c.   */
  29
  30 #if defined(sgi)
  31 void
  32 fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
  33      char *core_reg_sect;
  34      unsigned core_reg_size;
  35      int which;
  36      unsigned int reg_addr;
  37 {
  38   return;
  39 }
  40 #endif
  41
  42 /* Access to the inferior is only good for native systems, not cross.
  43    I am not sure why this is stubbed out on SGI...   --gnu@cygnus.com  */
  44
  45 #if defined(sgi) || !defined(GDB_TARGET_IS_MIPS)
  46
  47 /* ARGSUSED */
  48 void
  49 fetch_inferior_registers (regno)
  50      int regno;
  51 {
  52   return;
  53 }
  54
  55 /* ARGSUSED */
  56 void
  57 store_inferior_registers (regno)
  58      int regno;
  59 {
  60   return;
  61 }
  62
  63
  64 #else
  65
  66 /* Map gdb internal register number to ptrace address. */
  67
  68 #define REGISTER_PTRACE_ADDR(regno) \
  69  (regno < 32 ? regno            \
  70   : regno == PC_REGNUM ? 96     \
  71   : regno == CAUSE_REGNUM ? 97  \
  72   : regno == HI_REGNUM ? 98     \
  73   : regno == LO_REGNUM ? 99     \
  74   : regno == FCRCS_REGNUM ? 100 \
  75   : regno == FCRIR_REGNUM ? 101 \
  76   : regno >= FP0_REGNUM ? regno - (FP0_REGNUM-32)\
  77   : 0)
  78
  79 /* Get all registers from the inferior */
  80
  81 void
  82 fetch_inferior_registers (regno)
  83      int regno;
  84 {
  85   register unsigned int regaddr;
  86   char buf[MAX_REGISTER_RAW_SIZE];
  87   register int i;
  88
  89   registers_fetched ();
  90
  91   for (regno = 1; regno < NUM_REGS; regno++)
  92     {
  93       regaddr = REGISTER_PTRACE_ADDR (regno);
  94       for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int))
  95         {
  96           *(int *) &buf[i] = ptrace (3, inferior_pid,
  97                                      (PTRACE_ARG3_TYPE) regaddr, 0);
  98           regaddr += sizeof (int);
  99         }
 100       supply_register (regno, buf);
 101     }
 102 }
 103
 104 /* Store our register values back into the inferior.
 105    If REGNO is -1, do this for all registers.
 106    Otherwise, REGNO specifies which register (so we can save time).  */
 107
 108 void
 109 store_inferior_registers (regno)
 110      int regno;
 111  {
 112   register unsigned int regaddr;
 113   char buf[80];
 114
 115   if (regno == 0)
 116     return;
 117
 118   if (regno > 0)
 119     {
 120       regaddr = REGISTER_PTRACE_ADDR (regno);
 121       errno = 0;
 122       ptrace (6, inferior_pid, (PTRACE_ARG3_TYPE) regaddr,
 123               read_register (regno));
 124       if (errno != 0)
 125         {
 126           sprintf (buf, "writing register number %d", regno);
 127           perror_with_name (buf);
 128         }
 129     }
 130   else
 131     {
 132       for (regno = 0; regno < NUM_REGS; regno++)
 133         {
 134           if (regno == ZERO_REGNUM || regno == PS_REGNUM
 135               || regno == BADVADDR_REGNUM || regno == CAUSE_REGNUM
 136               || regno == FCRIR_REGNUM || regno == FP_REGNUM
 137               || (regno >= FIRST_EMBED_REGNUM && regno <= LAST_EMBED_REGNUM))
 138             continue;
 139           regaddr = register_addr (regno, 1);
 140           errno = 0;
 141           ptrace (6, inferior_pid, (PTRACE_ARG3_TYPE) regaddr,
 142                   read_register (regno));
 143           if (errno != 0)
 144             {
 145               sprintf (buf, "writing all regs, number %d", regno);
 146               perror_with_name (buf);
 147             }
 148         }
 149     }
 150 }
 151
 152 #endif /* sgi */