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 /* Prototypes for supply_gregset etc. */
  34 #include "gregset.h"
  35
  36 /* Size of elements in jmpbuf */
  37
  38 #define JB_ELEMENT_SIZE 4
  39
  40 typedef unsigned int greg_t;    /* why isn't this defined? */
  41
  42 static void fetch_core_registers (char *, unsigned int, int, CORE_ADDR);
  43
  44 /*
  45  * See the comment in m68k-tdep.c regarding the utility of these functions.
  46  */
  47
  48 void
  49 supply_gregset (gregsetp)
  50      gregset_t *gregsetp;
  51 {
  52   register int regi;
  53   register greg_t *regp = (greg_t *) (gregsetp->gp_regs);
  54   static char zerobuf[MAX_REGISTER_RAW_SIZE] =
  55   {0};
  56
  57   /* FIXME: somewhere, there should be a #define for the meaning
  58      of this magic number 32; we should use that. */
  59   for (regi = 0; regi < 32; regi++)
  60     supply_register (regi, (char *) (regp + regi));
  61
  62   supply_register (PC_REGNUM, (char *) &(gregsetp->gp_pc));
  63   supply_register (HI_REGNUM, (char *) &(gregsetp->gp_mdhi));
  64   supply_register (LO_REGNUM, (char *) &(gregsetp->gp_mdlo));
  65   supply_register (CAUSE_REGNUM, (char *) &(gregsetp->gp_cause));
  66
  67   /* Fill inaccessible registers with zero.  */
  68   supply_register (BADVADDR_REGNUM, zerobuf);
  69 }
  70
  71 void
  72 fill_gregset (gregsetp, regno)
  73      gregset_t *gregsetp;
  74      int regno;
  75 {
  76   int regi;
  77   register greg_t *regp = (greg_t *) (gregsetp->gp_regs);
  78
  79   /* same FIXME as above wrt 32 */
  80   for (regi = 0; regi < 32; regi++)
  81     if ((regno == -1) || (regno == regi))
  82       *(regp + regi) = *(greg_t *) & registers[REGISTER_BYTE (regi)];
  83
  84   if ((regno == -1) || (regno == PC_REGNUM))
  85     gregsetp->gp_pc = *(greg_t *) & registers[REGISTER_BYTE (PC_REGNUM)];
  86
  87   if ((regno == -1) || (regno == CAUSE_REGNUM))
  88     gregsetp->gp_cause = *(greg_t *) & registers[REGISTER_BYTE (CAUSE_REGNUM)];
  89
  90   if ((regno == -1) || (regno == HI_REGNUM))
  91     gregsetp->gp_mdhi = *(greg_t *) & registers[REGISTER_BYTE (HI_REGNUM)];
  92
  93   if ((regno == -1) || (regno == LO_REGNUM))
  94     gregsetp->gp_mdlo = *(greg_t *) & registers[REGISTER_BYTE (LO_REGNUM)];
  95 }
  96
  97 /*
  98  * Now we do the same thing for floating-point registers.
  99  * We don't bother to condition on FP0_REGNUM since any
 100  * reasonable MIPS configuration has an R3010 in it.
 101  *
 102  * Again, see the comments in m68k-tdep.c.
 103  */
 104
 105 void
 106 supply_fpregset (fpregsetp)
 107      fpregset_t *fpregsetp;
 108 {
 109   register int regi;
 110   static char zerobuf[MAX_REGISTER_RAW_SIZE] =
 111   {0};
 112
 113   for (regi = 0; regi < 32; regi++)
 114     supply_register (FP0_REGNUM + regi,
 115                      (char *) &fpregsetp->fp_r.fp_regs[regi]);
 116
 117   supply_register (FCRCS_REGNUM, (char *) &fpregsetp->fp_csr);
 118
 119   /* FIXME: how can we supply FCRIR_REGNUM?  SGI doesn't tell us. */
 120   supply_register (FCRIR_REGNUM, zerobuf);
 121 }
 122
 123 void
 124 fill_fpregset (fpregsetp, regno)
 125      fpregset_t *fpregsetp;
 126      int regno;
 127 {
 128   int regi;
 129   char *from, *to;
 130
 131   for (regi = FP0_REGNUM; regi < FP0_REGNUM + 32; regi++)
 132     {
 133       if ((regno == -1) || (regno == regi))
 134         {
 135           from = (char *) &registers[REGISTER_BYTE (regi)];
 136           to = (char *) &(fpregsetp->fp_r.fp_regs[regi - FP0_REGNUM]);
 137           memcpy (to, from, REGISTER_RAW_SIZE (regi));
 138         }
 139     }
 140
 141   if ((regno == -1) || (regno == FCRCS_REGNUM))
 142     fpregsetp->fp_csr = *(unsigned *) &registers[REGISTER_BYTE (FCRCS_REGNUM)];
 143 }
 144
 145
 146 /* Figure out where the longjmp will land.
 147    We expect the first arg to be a pointer to the jmp_buf structure from which
 148    we extract the pc (JB_PC) that we will land at.  The pc is copied into PC.
 149    This routine returns true on success. */
 150
 151 int
 152 get_longjmp_target (pc)
 153      CORE_ADDR *pc;
 154 {
 155   char buf[TARGET_PTR_BIT / TARGET_CHAR_BIT];
 156   CORE_ADDR jb_addr;
 157
 158   jb_addr = read_register (A0_REGNUM);
 159
 160   if (target_read_memory (jb_addr + JB_PC * JB_ELEMENT_SIZE, buf,
 161                           TARGET_PTR_BIT / TARGET_CHAR_BIT))
 162     return 0;
 163
 164   *pc = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT);
 165
 166   return 1;
 167 }
 168
 169 static void
 170 fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
 171      char *core_reg_sect;
 172      unsigned core_reg_size;
 173      int which;                 /* Unused */
 174      CORE_ADDR reg_addr;        /* Unused */
 175 {
 176   if (core_reg_size != REGISTER_BYTES)
 177     {
 178       warning ("wrong size gregset struct in core file");
 179       return;
 180     }
 181
 182   memcpy ((char *) registers, core_reg_sect, core_reg_size);
 183 }
 184 \f
 185
 186 /* Register that we are able to handle irix4 core file formats.
 187    FIXME: is this really bfd_target_unknown_flavour? */
 188
 189 static struct core_fns irix4_core_fns =
 190 {
 191   bfd_target_unknown_flavour,           /* core_flavour */
 192   default_check_format,                 /* check_format */
 193   default_core_sniffer,                 /* core_sniffer */
 194   fetch_core_registers,                 /* core_read_registers */
 195   NULL                                  /* next */
 196 };
 197
 198 void
 199 _initialize_core_irix4 ()
 200 {
 201   add_core_fns (&irix4_core_fns);
 202 }