gdb/sun3-nat.c

   1 /* Host-dependent code for Sun-3 for GDB, the GNU debugger.
   2    Copyright 1986, 1987, 1989, 1991, 1992 Free Software Foundation, Inc.
   3
   4    This file is part of GDB.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, USA.  */
  20
  21 #include "defs.h"
  22 #include "inferior.h"
  23 #include "gdbcore.h"
  24
  25 #include <sys/ptrace.h>
  26 #define KERNEL                  /* To get floating point reg definitions */
  27 #include <machine/reg.h>
  28
  29 static void fetch_core_registers PARAMS ((char *, unsigned, int, CORE_ADDR));
  30
  31 void
  32 fetch_inferior_registers (regno)
  33      int regno;
  34 {
  35   struct regs inferior_registers;
  36 #ifdef FP0_REGNUM
  37   struct fp_status inferior_fp_registers;
  38 #endif
  39
  40   registers_fetched ();
  41
  42   ptrace (PTRACE_GETREGS, inferior_pid,
  43           (PTRACE_ARG3_TYPE) & inferior_registers);
  44 #ifdef FP0_REGNUM
  45   ptrace (PTRACE_GETFPREGS, inferior_pid,
  46           (PTRACE_ARG3_TYPE) & inferior_fp_registers);
  47 #endif
  48
  49   memcpy (registers, &inferior_registers, 16 * 4);
  50 #ifdef FP0_REGNUM
  51   memcpy (&registers[REGISTER_BYTE (FP0_REGNUM)], &inferior_fp_registers,
  52           sizeof inferior_fp_registers.fps_regs);
  53 #endif
  54   *(int *) &registers[REGISTER_BYTE (PS_REGNUM)] = inferior_registers.r_ps;
  55   *(int *) &registers[REGISTER_BYTE (PC_REGNUM)] = inferior_registers.r_pc;
  56 #ifdef FP0_REGNUM
  57   memcpy (&registers[REGISTER_BYTE (FPC_REGNUM)],
  58           &inferior_fp_registers.fps_control,
  59       sizeof inferior_fp_registers - sizeof inferior_fp_registers.fps_regs);
  60 #endif
  61 }
  62
  63 /* Store our register values back into the inferior.
  64    If REGNO is -1, do this for all registers.
  65    Otherwise, REGNO specifies which register (so we can save time).  */
  66
  67 void
  68 store_inferior_registers (regno)
  69      int regno;
  70 {
  71   struct regs inferior_registers;
  72 #ifdef FP0_REGNUM
  73   struct fp_status inferior_fp_registers;
  74 #endif
  75
  76   memcpy (&inferior_registers, registers, 16 * 4);
  77 #ifdef FP0_REGNUM
  78   memcpy (&inferior_fp_registers, &registers[REGISTER_BYTE (FP0_REGNUM)],
  79           sizeof inferior_fp_registers.fps_regs);
  80 #endif
  81   inferior_registers.r_ps = *(int *) &registers[REGISTER_BYTE (PS_REGNUM)];
  82   inferior_registers.r_pc = *(int *) &registers[REGISTER_BYTE (PC_REGNUM)];
  83
  84 #ifdef FP0_REGNUM
  85   memcpy (&inferior_fp_registers.fps_control,
  86           &registers[REGISTER_BYTE (FPC_REGNUM)],
  87       sizeof inferior_fp_registers - sizeof inferior_fp_registers.fps_regs);
  88 #endif
  89
  90   ptrace (PTRACE_SETREGS, inferior_pid,
  91           (PTRACE_ARG3_TYPE) & inferior_registers);
  92 #if FP0_REGNUM
  93   ptrace (PTRACE_SETFPREGS, inferior_pid,
  94           (PTRACE_ARG3_TYPE) & inferior_fp_registers);
  95 #endif
  96 }
  97
  98
  99 /* All of this stuff is only relevant if both host and target are sun3.  */
 100 /* Machine-dependent code for pulling registers out of a Sun-3 core file. */
 101
 102 static void
 103 fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
 104      char *core_reg_sect;
 105      unsigned core_reg_size;
 106      int which;
 107      CORE_ADDR reg_addr;        /* Unused in this version */
 108 {
 109   struct regs *regs = (struct regs *) core_reg_sect;
 110
 111   if (which == 0)
 112     {
 113       if (core_reg_size < sizeof (struct regs))
 114           error ("Can't find registers in core file");
 115
 116       memcpy (registers, (char *) regs, 16 * 4);
 117       supply_register (PS_REGNUM, (char *) &regs->r_ps);
 118       supply_register (PC_REGNUM, (char *) &regs->r_pc);
 119
 120     }
 121   else if (which == 2)
 122     {
 123
 124 #define fpustruct  ((struct fpu *) core_reg_sect)
 125
 126       if (core_reg_size >= sizeof (struct fpu))
 127         {
 128 #ifdef FP0_REGNUM
 129           memcpy (&registers[REGISTER_BYTE (FP0_REGNUM)],
 130                   fpustruct->f_fpstatus.fps_regs,
 131                   sizeof fpustruct->f_fpstatus.fps_regs);
 132           memcpy (&registers[REGISTER_BYTE (FPC_REGNUM)],
 133                   &fpustruct->f_fpstatus.fps_control,
 134                   sizeof fpustruct->f_fpstatus -
 135                   sizeof fpustruct->f_fpstatus.fps_regs);
 136 #endif
 137         }
 138       else
 139         fprintf_unfiltered (gdb_stderr, "Couldn't read float regs from core file\n");
 140     }
 141 }
 142 \f
 143
 144 /* Register that we are able to handle sun3 core file formats.
 145    FIXME: is this really bfd_target_unknown_flavour? */
 146
 147 static struct core_fns sun3_core_fns =
 148 {
 149   bfd_target_unknown_flavour,           /* core_flavour */
 150   default_check_format,                 /* check_format */
 151   default_core_sniffer,                 /* core_sniffer */
 152   fetch_core_registers,                 /* core_read_registers */
 153   NULL                                  /* next */
 154 };
 155
 156 void
 157 _initialize_core_sun3 ()
 158 {
 159   add_core_fns (&sun3_core_fns);
 160 }