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