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,
  23    Boston, MA 02111-1307, USA.  */
  24
  25 #include "defs.h"
  26 #include "inferior.h"
  27 #include "gdbcore.h"
  28
  29 #include <sys/time.h>
  30 #include <sys/procfs.h>
  31 #include <setjmp.h>             /* For JB_XXX.  */
  32
  33 /* Size of elements in jmpbuf */
  34
  35 #define JB_ELEMENT_SIZE 4
  36
  37 typedef unsigned int greg_t;    /* why isn't this defined? */
  38
  39 static void
  40 fetch_core_registers PARAMS ((char *, unsigned int, int, CORE_ADDR));
  41
  42 /*
  43  * See the comment in m68k-tdep.c regarding the utility of these functions.
  44  */
  45
  46 void
  47 supply_gregset (gregsetp)
  48      gregset_t *gregsetp;
  49 {
  50   register int regi;
  51   register greg_t *regp = (greg_t *) (gregsetp->gp_regs);
  52   static char zerobuf[MAX_REGISTER_RAW_SIZE] =
  53   {0};
  54
  55   /* FIXME: somewhere, there should be a #define for the meaning
  56      of this magic number 32; we should use that. */
  57   for (regi = 0; regi < 32; regi++)
  58     supply_register (regi, (char *) (regp + regi));
  59
  60   supply_register (PC_REGNUM, (char *) &(gregsetp->gp_pc));
  61   supply_register (HI_REGNUM, (char *) &(gregsetp->gp_mdhi));
  62   supply_register (LO_REGNUM, (char *) &(gregsetp->gp_mdlo));
  63   supply_register (CAUSE_REGNUM, (char *) &(gregsetp->gp_cause));
  64
  65   /* Fill inaccessible registers with zero.  */
  66   supply_register (BADVADDR_REGNUM, zerobuf);
  67 }
  68
  69 void
  70 fill_gregset (gregsetp, regno)
  71      gregset_t *gregsetp;
  72      int regno;
  73 {
  74   int regi;
  75   register greg_t *regp = (greg_t *) (gregsetp->gp_regs);
  76
  77   /* same FIXME as above wrt 32 */
  78   for (regi = 0; regi < 32; regi++)
  79     if ((regno == -1) || (regno == regi))
  80       *(regp + regi) = *(greg_t *) & registers[REGISTER_BYTE (regi)];
  81
  82   if ((regno == -1) || (regno == PC_REGNUM))
  83     gregsetp->gp_pc = *(greg_t *) & registers[REGISTER_BYTE (PC_REGNUM)];
  84
  85   if ((regno == -1) || (regno == CAUSE_REGNUM))
  86     gregsetp->gp_cause = *(greg_t *) & registers[REGISTER_BYTE (CAUSE_REGNUM)];
  87
  88   if ((regno == -1) || (regno == HI_REGNUM))
  89     gregsetp->gp_mdhi = *(greg_t *) & registers[REGISTER_BYTE (HI_REGNUM)];
  90
  91   if ((regno == -1) || (regno == LO_REGNUM))
  92     gregsetp->gp_mdlo = *(greg_t *) & registers[REGISTER_BYTE (LO_REGNUM)];
  93 }
  94
  95 /*
  96  * Now we do the same thing for floating-point registers.
  97  * We don't bother to condition on FP0_REGNUM since any
  98  * reasonable MIPS configuration has an R3010 in it.
  99  *
 100  * Again, see the comments in m68k-tdep.c.
 101  */
 102
 103 void
 104 supply_fpregset (fpregsetp)
 105      fpregset_t *fpregsetp;
 106 {
 107   register int regi;
 108   static char zerobuf[MAX_REGISTER_RAW_SIZE] =
 109   {0};
 110
 111   for (regi = 0; regi < 32; regi++)
 112     supply_register (FP0_REGNUM + regi,
 113                      (char *) &fpregsetp->fp_r.fp_regs[regi]);
 114
 115   supply_register (FCRCS_REGNUM, (char *) &fpregsetp->fp_csr);
 116
 117   /* FIXME: how can we supply FCRIR_REGNUM?  SGI doesn't tell us. */
 118   supply_register (FCRIR_REGNUM, zerobuf);
 119 }
 120
 121 void
 122 fill_fpregset (fpregsetp, regno)
 123      fpregset_t *fpregsetp;
 124      int regno;
 125 {
 126   int regi;
 127   char *from, *to;
 128
 129   for (regi = FP0_REGNUM; regi < FP0_REGNUM + 32; regi++)
 130     {
 131       if ((regno == -1) || (regno == regi))
 132         {
 133           from = (char *) &registers[REGISTER_BYTE (regi)];
 134           to = (char *) &(fpregsetp->fp_r.fp_regs[regi - FP0_REGNUM]);
 135           memcpy (to, from, REGISTER_RAW_SIZE (regi));
 136         }
 137     }
 138
 139   if ((regno == -1) || (regno == FCRCS_REGNUM))
 140     fpregsetp->fp_csr = *(unsigned *) &registers[REGISTER_BYTE (FCRCS_REGNUM)];
 141 }
 142
 143
 144 /* Figure out where the longjmp will land.
 145    We expect the first arg to be a pointer to the jmp_buf structure from which
 146    we extract the pc (JB_PC) that we will land at.  The pc is copied into PC.
 147    This routine returns true on success. */
 148
 149 int
 150 get_longjmp_target (pc)
 151      CORE_ADDR *pc;
 152 {
 153   char buf[TARGET_PTR_BIT / TARGET_CHAR_BIT];
 154   CORE_ADDR jb_addr;
 155
 156   jb_addr = read_register (A0_REGNUM);
 157
 158   if (target_read_memory (jb_addr + JB_PC * JB_ELEMENT_SIZE, buf,
 159                           TARGET_PTR_BIT / TARGET_CHAR_BIT))
 160     return 0;
 161
 162   *pc = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT);
 163
 164   return 1;
 165 }
 166
 167 static void
 168 fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
 169      char *core_reg_sect;
 170      unsigned core_reg_size;
 171      int which;                 /* Unused */
 172      CORE_ADDR reg_addr;        /* Unused */
 173 {
 174   if (core_reg_size != REGISTER_BYTES)
 175     {
 176       warning ("wrong size gregset struct in core file");
 177       return;
 178     }
 179
 180   memcpy ((char *) registers, core_reg_sect, core_reg_size);
 181 }
 182 \f
 183
 184 /* Register that we are able to handle irix4 core file formats.
 185    FIXME: is this really bfd_target_unknown_flavour? */
 186
 187 static struct core_fns irix4_core_fns =
 188 {
 189   bfd_target_unknown_flavour,
 190   fetch_core_registers,
 191   NULL
 192 };
 193
 194 void
 195 _initialize_core_irix4 ()
 196 {
 197   add_core_fns (&irix4_core_fns);
 198 }