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
  43 fetch_core_registers PARAMS ((char *, unsigned int, int, CORE_ADDR));
  44
  45 /*
  46  * See the comment in m68k-tdep.c regarding the utility of these functions.
  47  */
  48
  49 void
  50 supply_gregset (gregsetp)
  51      gregset_t *gregsetp;
  52 {
  53   register int regi;
  54   register greg_t *regp = (greg_t *) (gregsetp->gp_regs);
  55   static char zerobuf[MAX_REGISTER_RAW_SIZE] =
  56   {0};
  57
  58   /* FIXME: somewhere, there should be a #define for the meaning
  59      of this magic number 32; we should use that. */
  60   for (regi = 0; regi < 32; regi++)
  61     supply_register (regi, (char *) (regp + regi));
  62
  63   supply_register (PC_REGNUM, (char *) &(gregsetp->gp_pc));
  64   supply_register (HI_REGNUM, (char *) &(gregsetp->gp_mdhi));
  65   supply_register (LO_REGNUM, (char *) &(gregsetp->gp_mdlo));
  66   supply_register (CAUSE_REGNUM, (char *) &(gregsetp->gp_cause));
  67
  68   /* Fill inaccessible registers with zero.  */
  69   supply_register (BADVADDR_REGNUM, zerobuf);
  70 }
  71
  72 void
  73 fill_gregset (gregsetp, regno)
  74      gregset_t *gregsetp;
  75      int regno;
  76 {
  77   int regi;
  78   register greg_t *regp = (greg_t *) (gregsetp->gp_regs);
  79
  80   /* same FIXME as above wrt 32 */
  81   for (regi = 0; regi < 32; regi++)
  82     if ((regno == -1) || (regno == regi))
  83       *(regp + regi) = *(greg_t *) & registers[REGISTER_BYTE (regi)];
  84
  85   if ((regno == -1) || (regno == PC_REGNUM))
  86     gregsetp->gp_pc = *(greg_t *) & registers[REGISTER_BYTE (PC_REGNUM)];
  87
  88   if ((regno == -1) || (regno == CAUSE_REGNUM))
  89     gregsetp->gp_cause = *(greg_t *) & registers[REGISTER_BYTE (CAUSE_REGNUM)];
  90
  91   if ((regno == -1) || (regno == HI_REGNUM))
  92     gregsetp->gp_mdhi = *(greg_t *) & registers[REGISTER_BYTE (HI_REGNUM)];
  93
  94   if ((regno == -1) || (regno == LO_REGNUM))
  95     gregsetp->gp_mdlo = *(greg_t *) & registers[REGISTER_BYTE (LO_REGNUM)];
  96 }
  97
  98 /*
  99  * Now we do the same thing for floating-point registers.
 100  * We don't bother to condition on FP0_REGNUM since any
 101  * reasonable MIPS configuration has an R3010 in it.
 102  *
 103  * Again, see the comments in m68k-tdep.c.
 104  */
 105
 106 void
 107 supply_fpregset (fpregsetp)
 108      fpregset_t *fpregsetp;
 109 {
 110   register int regi;
 111   static char zerobuf[MAX_REGISTER_RAW_SIZE] =
 112   {0};
 113
 114   for (regi = 0; regi < 32; regi++)
 115     supply_register (FP0_REGNUM + regi,
 116                      (char *) &fpregsetp->fp_r.fp_regs[regi]);
 117
 118   supply_register (FCRCS_REGNUM, (char *) &fpregsetp->fp_csr);
 119
 120   /* FIXME: how can we supply FCRIR_REGNUM?  SGI doesn't tell us. */
 121   supply_register (FCRIR_REGNUM, zerobuf);
 122 }
 123
 124 void
 125 fill_fpregset (fpregsetp, regno)
 126      fpregset_t *fpregsetp;
 127      int regno;
 128 {
 129   int regi;
 130   char *from, *to;
 131
 132   for (regi = FP0_REGNUM; regi < FP0_REGNUM + 32; regi++)
 133     {
 134       if ((regno == -1) || (regno == regi))
 135         {
 136           from = (char *) &registers[REGISTER_BYTE (regi)];
 137           to = (char *) &(fpregsetp->fp_r.fp_regs[regi - FP0_REGNUM]);
 138           memcpy (to, from, REGISTER_RAW_SIZE (regi));
 139         }
 140     }
 141
 142   if ((regno == -1) || (regno == FCRCS_REGNUM))
 143     fpregsetp->fp_csr = *(unsigned *) &registers[REGISTER_BYTE (FCRCS_REGNUM)];
 144 }
 145
 146
 147 /* Figure out where the longjmp will land.
 148    We expect the first arg to be a pointer to the jmp_buf structure from which
 149    we extract the pc (JB_PC) that we will land at.  The pc is copied into PC.
 150    This routine returns true on success. */
 151
 152 int
 153 get_longjmp_target (pc)
 154      CORE_ADDR *pc;
 155 {
 156   char buf[TARGET_PTR_BIT / TARGET_CHAR_BIT];
 157   CORE_ADDR jb_addr;
 158
 159   jb_addr = read_register (A0_REGNUM);
 160
 161   if (target_read_memory (jb_addr + JB_PC * JB_ELEMENT_SIZE, buf,
 162                           TARGET_PTR_BIT / TARGET_CHAR_BIT))
 163     return 0;
 164
 165   *pc = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT);
 166
 167   return 1;
 168 }
 169
 170 static void
 171 fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
 172      char *core_reg_sect;
 173      unsigned core_reg_size;
 174      int which;                 /* Unused */
 175      CORE_ADDR reg_addr;        /* Unused */
 176 {
 177   if (core_reg_size != REGISTER_BYTES)
 178     {
 179       warning ("wrong size gregset struct in core file");
 180       return;
 181     }
 182
 183   memcpy ((char *) registers, core_reg_sect, core_reg_size);
 184 }
 185 \f
 186
 187 /* Register that we are able to handle irix4 core file formats.
 188    FIXME: is this really bfd_target_unknown_flavour? */
 189
 190 static struct core_fns irix4_core_fns =
 191 {
 192   bfd_target_unknown_flavour,           /* core_flavour */
 193   default_check_format,                 /* check_format */
 194   default_core_sniffer,                 /* core_sniffer */
 195   fetch_core_registers,                 /* core_read_registers */
 196   NULL                                  /* next */
 197 };
 198
 199 void
 200 _initialize_core_irix4 ()
 201 {
 202   add_core_fns (&irix4_core_fns);
 203 }