gdb/irix4-nat.c

   1 /* Native support for the SGI Iris running IRIX version 4, for GDB.
   2    Copyright 1988, 1989, 1990, 1991, 1992, 1993, 1995
   3    Free Software Foundation, Inc.
   4    Contributed by Alessandro Forin(af@cs.cmu.edu) at CMU
   5    and by Per Bothner(bothner@cs.wisc.edu) at U.Wisconsin.
   6    Implemented for Irix 4.x by Garrett A. Wollman.
   7
   8 This file is part of GDB.
   9
  10 This program is free software; you can redistribute it and/or modify
  11 it under the terms of the GNU General Public License as published by
  12 the Free Software Foundation; either version 2 of the License, or
  13 (at your option) any later version.
  14
  15 This program is distributed in the hope that it will be useful,
  16 but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 GNU General Public License for more details.
  19
  20 You should have received a copy of the GNU General Public License
  21 along with this program; if not, write to the Free Software
  22 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  23
  24 #include "defs.h"
  25 #include "inferior.h"
  26 #include "gdbcore.h"
  27
  28 #include <sys/time.h>
  29 #include <sys/procfs.h>
  30 #include <setjmp.h>             /* For JB_XXX.  */
  31
  32 /* Size of elements in jmpbuf */
  33
  34 #define JB_ELEMENT_SIZE 4
  35
  36 typedef unsigned int greg_t;    /* why isn't this defined? */
  37
  38 static void
  39 fetch_core_registers PARAMS ((char *, unsigned int, int, CORE_ADDR));
  40
  41 /*
  42  * See the comment in m68k-tdep.c regarding the utility of these functions.
  43  */
  44
  45 void
  46 supply_gregset (gregsetp)
  47      gregset_t *gregsetp;
  48 {
  49   register int regi;
  50   register greg_t *regp = (greg_t *)(gregsetp->gp_regs);
  51   static char zerobuf[MAX_REGISTER_RAW_SIZE] = {0};
  52
  53   /* FIXME: somewhere, there should be a #define for the meaning
  54      of this magic number 32; we should use that. */
  55   for(regi = 0; regi < 32; regi++)
  56     supply_register (regi, (char *)(regp + regi));
  57
  58   supply_register (PC_REGNUM, (char *)&(gregsetp->gp_pc));
  59   supply_register (HI_REGNUM, (char *)&(gregsetp->gp_mdhi));
  60   supply_register (LO_REGNUM, (char *)&(gregsetp->gp_mdlo));
  61   supply_register (CAUSE_REGNUM, (char *)&(gregsetp->gp_cause));
  62
  63   /* Fill inaccessible registers with zero.  */
  64   supply_register (BADVADDR_REGNUM, zerobuf);
  65 }
  66
  67 void
  68 fill_gregset (gregsetp, regno)
  69      gregset_t *gregsetp;
  70      int regno;
  71 {
  72   int regi;
  73   register greg_t *regp = (greg_t *)(gregsetp->gp_regs);
  74
  75   /* same FIXME as above wrt 32*/
  76   for (regi = 0; regi < 32; regi++)
  77     if ((regno == -1) || (regno == regi))
  78       *(regp + regi) = *(greg_t *) &registers[REGISTER_BYTE (regi)];
  79
  80   if ((regno == -1) || (regno == PC_REGNUM))
  81     gregsetp->gp_pc = *(greg_t *) &registers[REGISTER_BYTE (PC_REGNUM)];
  82
  83   if ((regno == -1) || (regno == CAUSE_REGNUM))
  84     gregsetp->gp_cause = *(greg_t *) &registers[REGISTER_BYTE (CAUSE_REGNUM)];
  85
  86   if ((regno == -1) || (regno == HI_REGNUM))
  87     gregsetp->gp_mdhi = *(greg_t *) &registers[REGISTER_BYTE (HI_REGNUM)];
  88
  89   if ((regno == -1) || (regno == LO_REGNUM))
  90     gregsetp->gp_mdlo = *(greg_t *) &registers[REGISTER_BYTE (LO_REGNUM)];
  91 }
  92
  93 /*
  94  * Now we do the same thing for floating-point registers.
  95  * We don't bother to condition on FP0_REGNUM since any
  96  * reasonable MIPS configuration has an R3010 in it.
  97  *
  98  * Again, see the comments in m68k-tdep.c.
  99  */
 100
 101 void
 102 supply_fpregset (fpregsetp)
 103      fpregset_t *fpregsetp;
 104 {
 105   register int regi;
 106   static char zerobuf[MAX_REGISTER_RAW_SIZE] = {0};
 107
 108   for (regi = 0; regi < 32; regi++)
 109     supply_register (FP0_REGNUM + regi,
 110                      (char *)&fpregsetp->fp_r.fp_regs[regi]);
 111
 112   supply_register (FCRCS_REGNUM, (char *)&fpregsetp->fp_csr);
 113
 114   /* FIXME: how can we supply FCRIR_REGNUM?  SGI doesn't tell us. */
 115   supply_register (FCRIR_REGNUM, zerobuf);
 116 }
 117
 118 void
 119 fill_fpregset (fpregsetp, regno)
 120      fpregset_t *fpregsetp;
 121      int regno;
 122 {
 123   int regi;
 124   char *from, *to;
 125
 126   for (regi = FP0_REGNUM; regi < FP0_REGNUM + 32; regi++)
 127     {
 128       if ((regno == -1) || (regno == regi))
 129         {
 130           from = (char *) &registers[REGISTER_BYTE (regi)];
 131           to = (char *) &(fpregsetp->fp_r.fp_regs[regi - FP0_REGNUM]);
 132           memcpy(to, from, REGISTER_RAW_SIZE (regi));
 133         }
 134     }
 135
 136   if ((regno == -1) || (regno == FCRCS_REGNUM))
 137     fpregsetp->fp_csr = *(unsigned *) &registers[REGISTER_BYTE(FCRCS_REGNUM)];
 138 }
 139
 140
 141 /* Figure out where the longjmp will land.
 142    We expect the first arg to be a pointer to the jmp_buf structure from which
 143    we extract the pc (JB_PC) that we will land at.  The pc is copied into PC.
 144    This routine returns true on success. */
 145
 146 int
 147 get_longjmp_target (pc)
 148      CORE_ADDR *pc;
 149 {
 150   char buf[TARGET_PTR_BIT / TARGET_CHAR_BIT];
 151   CORE_ADDR jb_addr;
 152
 153   jb_addr = read_register (A0_REGNUM);
 154
 155   if (target_read_memory (jb_addr + JB_PC * JB_ELEMENT_SIZE, buf,
 156                           TARGET_PTR_BIT / TARGET_CHAR_BIT))
 157     return 0;
 158
 159   *pc = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT);
 160
 161   return 1;
 162 }
 163
 164 static void
 165 fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
 166      char *core_reg_sect;
 167      unsigned core_reg_size;
 168      int which;                 /* Unused */
 169      CORE_ADDR reg_addr;        /* Unused */
 170 {
 171   if (core_reg_size != REGISTER_BYTES)
 172     {
 173       warning ("wrong size gregset struct in core file");
 174       return;
 175     }
 176
 177   memcpy ((char *)registers, core_reg_sect, core_reg_size);
 178 }
 179
 180 \f
 181 /* Register that we are able to handle irix4 core file formats.
 182    FIXME: is this really bfd_target_unknown_flavour? */
 183
 184 static struct core_fns irix4_core_fns =
 185 {
 186   bfd_target_unknown_flavour,
 187   fetch_core_registers,
 188   NULL
 189 };
 190
 191 void
 192 _initialize_core_irix4 ()
 193 {
 194   add_core_fns (&irix4_core_fns);
 195 }