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   struct fp_status inferior_fp_registers;
  37
  38   registers_fetched ();
  39
  40   ptrace (PTRACE_GETREGS, inferior_pid,
  41           (PTRACE_ARG3_TYPE) & inferior_registers);
  42
  43   if (FP0_REGNUM >= 0)
  44     ptrace (PTRACE_GETFPREGS, inferior_pid,
  45             (PTRACE_ARG3_TYPE) & inferior_fp_registers);
  46
  47   memcpy (registers, &inferior_registers, 16 * 4);
  48   if (FP0_REGNUM >= 0)
  49     memcpy (&registers[REGISTER_BYTE (FP0_REGNUM)], &inferior_fp_registers,
  50             sizeof inferior_fp_registers.fps_regs);
  51
  52   *(int *) &registers[REGISTER_BYTE (PS_REGNUM)] = inferior_registers.r_ps;
  53   *(int *) &registers[REGISTER_BYTE (PC_REGNUM)] = inferior_registers.r_pc;
  54   if (FP0_REGNUM >= 0)
  55     memcpy (&registers[REGISTER_BYTE (FPC_REGNUM)],
  56             &inferior_fp_registers.fps_control,
  57             sizeof inferior_fp_registers -
  58             sizeof inferior_fp_registers.fps_regs);
  59 }
  60
  61 /* Store our register values back into the inferior.
  62    If REGNO is -1, do this for all registers.
  63    Otherwise, REGNO specifies which register (so we can save time).  */
  64
  65 void
  66 store_inferior_registers (regno)
  67      int regno;
  68 {
  69   struct regs inferior_registers;
  70   struct fp_status inferior_fp_registers;
  71
  72   memcpy (&inferior_registers, registers, 16 * 4);
  73   if (FP0_REGNUM >= 0)
  74     memcpy (&inferior_fp_registers, &registers[REGISTER_BYTE (FP0_REGNUM)],
  75             sizeof inferior_fp_registers.fps_regs);
  76
  77   inferior_registers.r_ps = *(int *) &registers[REGISTER_BYTE (PS_REGNUM)];
  78   inferior_registers.r_pc = *(int *) &registers[REGISTER_BYTE (PC_REGNUM)];
  79
  80   if (FP0_REGNUM >= 0)
  81     memcpy (&inferior_fp_registers.fps_control,
  82             &registers[REGISTER_BYTE (FPC_REGNUM)],
  83             sizeof inferior_fp_registers -
  84             sizeof inferior_fp_registers.fps_regs);
  85
  86   ptrace (PTRACE_SETREGS, inferior_pid,
  87           (PTRACE_ARG3_TYPE) & inferior_registers);
  88   if (FP0_REGNUM >= 0)
  89     ptrace (PTRACE_SETFPREGS, inferior_pid,
  90             (PTRACE_ARG3_TYPE) & inferior_fp_registers);
  91 }
  92
  93
  94 /* All of this stuff is only relevant if both host and target are sun3.  */
  95 /* Machine-dependent code for pulling registers out of a Sun-3 core file. */
  96
  97 static void
  98 fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
  99      char *core_reg_sect;
 100      unsigned core_reg_size;
 101      int which;
 102      CORE_ADDR reg_addr;        /* Unused in this version */
 103 {
 104   struct regs *regs = (struct regs *) core_reg_sect;
 105
 106   if (which == 0)
 107     {
 108       if (core_reg_size < sizeof (struct regs))
 109           error ("Can't find registers in core file");
 110
 111       memcpy (registers, (char *) regs, 16 * 4);
 112       supply_register (PS_REGNUM, (char *) &regs->r_ps);
 113       supply_register (PC_REGNUM, (char *) &regs->r_pc);
 114
 115     }
 116   else if (which == 2)
 117     {
 118
 119 #define fpustruct  ((struct fpu *) core_reg_sect)
 120
 121       if (core_reg_size >= sizeof (struct fpu))
 122         {
 123           if (FP0_REGNUM >= 0)
 124             {
 125               memcpy (&registers[REGISTER_BYTE (FP0_REGNUM)],
 126                       fpustruct->f_fpstatus.fps_regs,
 127                       sizeof fpustruct->f_fpstatus.fps_regs);
 128               memcpy (&registers[REGISTER_BYTE (FPC_REGNUM)],
 129                       &fpustruct->f_fpstatus.fps_control,
 130                       sizeof fpustruct->f_fpstatus -
 131                       sizeof fpustruct->f_fpstatus.fps_regs);
 132             }
 133         }
 134       else
 135         fprintf_unfiltered (gdb_stderr,
 136                             "Couldn't read float regs from core file\n");
 137     }
 138 }
 139 \f
 140
 141 /* Register that we are able to handle sun3 core file formats.
 142    FIXME: is this really bfd_target_unknown_flavour? */
 143
 144 static struct core_fns sun3_core_fns =
 145 {
 146   bfd_target_unknown_flavour,           /* core_flavour */
 147   default_check_format,                 /* check_format */
 148   default_core_sniffer,                 /* core_sniffer */
 149   fetch_core_registers,                 /* core_read_registers */
 150   NULL                                  /* next */
 151 };
 152
 153 void
 154 _initialize_core_sun3 ()
 155 {
 156   add_core_fns (&sun3_core_fns);
 157 }