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 (char *, unsigned, int, CORE_ADDR);
  30
  31 void
  32 fetch_inferior_registers (int regno)
  33 {
  34   struct regs inferior_registers;
  35   struct fp_status inferior_fp_registers;
  36
  37   registers_fetched ();
  38
  39   ptrace (PTRACE_GETREGS, inferior_pid,
  40           (PTRACE_ARG3_TYPE) & inferior_registers);
  41
  42   if (FP0_REGNUM >= 0)
  43     ptrace (PTRACE_GETFPREGS, inferior_pid,
  44             (PTRACE_ARG3_TYPE) & inferior_fp_registers);
  45
  46   memcpy (registers, &inferior_registers, 16 * 4);
  47   if (FP0_REGNUM >= 0)
  48     memcpy (&registers[REGISTER_BYTE (FP0_REGNUM)], &inferior_fp_registers,
  49             sizeof inferior_fp_registers.fps_regs);
  50
  51   *(int *) &registers[REGISTER_BYTE (PS_REGNUM)] = inferior_registers.r_ps;
  52   *(int *) &registers[REGISTER_BYTE (PC_REGNUM)] = inferior_registers.r_pc;
  53   if (FP0_REGNUM >= 0)
  54     memcpy (&registers[REGISTER_BYTE (FPC_REGNUM)],
  55             &inferior_fp_registers.fps_control,
  56             sizeof inferior_fp_registers -
  57             sizeof inferior_fp_registers.fps_regs);
  58 }
  59
  60 /* Store our register values back into the inferior.
  61    If REGNO is -1, do this for all registers.
  62    Otherwise, REGNO specifies which register (so we can save time).  */
  63
  64 void
  65 store_inferior_registers (int regno)
  66 {
  67   struct regs inferior_registers;
  68   struct fp_status inferior_fp_registers;
  69
  70   memcpy (&inferior_registers, registers, 16 * 4);
  71   if (FP0_REGNUM >= 0)
  72     memcpy (&inferior_fp_registers, &registers[REGISTER_BYTE (FP0_REGNUM)],
  73             sizeof inferior_fp_registers.fps_regs);
  74
  75   inferior_registers.r_ps = *(int *) &registers[REGISTER_BYTE (PS_REGNUM)];
  76   inferior_registers.r_pc = *(int *) &registers[REGISTER_BYTE (PC_REGNUM)];
  77
  78   if (FP0_REGNUM >= 0)
  79     memcpy (&inferior_fp_registers.fps_control,
  80             &registers[REGISTER_BYTE (FPC_REGNUM)],
  81             sizeof inferior_fp_registers -
  82             sizeof inferior_fp_registers.fps_regs);
  83
  84   ptrace (PTRACE_SETREGS, inferior_pid,
  85           (PTRACE_ARG3_TYPE) & inferior_registers);
  86   if (FP0_REGNUM >= 0)
  87     ptrace (PTRACE_SETFPREGS, inferior_pid,
  88             (PTRACE_ARG3_TYPE) & inferior_fp_registers);
  89 }
  90
  91
  92 /* All of this stuff is only relevant if both host and target are sun3.  */
  93
  94 /* Provide registers to GDB from a core file.
  95
  96    CORE_REG_SECT points to an array of bytes, which were obtained from
  97    a core file which BFD thinks might contain register contents.
  98    CORE_REG_SIZE is its size.
  99
 100    WHICH says which register set corelow suspects this is:
 101      0 --- the general-purpose register set
 102      2 --- the floating-point register set
 103
 104    REG_ADDR isn't used.  */
 105
 106 static void
 107 fetch_core_registers (char *core_reg_sect, unsigned core_reg_size,
 108                       int which, CORE_ADDR reg_addr)
 109 {
 110   struct regs *regs = (struct regs *) core_reg_sect;
 111
 112   if (which == 0)
 113     {
 114       if (core_reg_size < sizeof (struct regs))
 115           error ("Can't find registers in core file");
 116
 117       memcpy (registers, (char *) regs, 16 * 4);
 118       supply_register (PS_REGNUM, (char *) &regs->r_ps);
 119       supply_register (PC_REGNUM, (char *) &regs->r_pc);
 120
 121     }
 122   else if (which == 2)
 123     {
 124
 125 #define fpustruct  ((struct fpu *) core_reg_sect)
 126
 127       if (core_reg_size >= sizeof (struct fpu))
 128         {
 129           if (FP0_REGNUM >= 0)
 130             {
 131               memcpy (&registers[REGISTER_BYTE (FP0_REGNUM)],
 132                       fpustruct->f_fpstatus.fps_regs,
 133                       sizeof fpustruct->f_fpstatus.fps_regs);
 134               memcpy (&registers[REGISTER_BYTE (FPC_REGNUM)],
 135                       &fpustruct->f_fpstatus.fps_control,
 136                       sizeof fpustruct->f_fpstatus -
 137                       sizeof fpustruct->f_fpstatus.fps_regs);
 138             }
 139         }
 140       else
 141         fprintf_unfiltered (gdb_stderr,
 142                             "Couldn't read float regs from core file\n");
 143     }
 144 }
 145 \f
 146
 147 /* Register that we are able to handle sun3 core file formats.
 148    FIXME: is this really bfd_target_unknown_flavour? */
 149
 150 static struct core_fns sun3_core_fns =
 151 {
 152   bfd_target_unknown_flavour,           /* core_flavour */
 153   default_check_format,                 /* check_format */
 154   default_core_sniffer,                 /* core_sniffer */
 155   fetch_core_registers,                 /* core_read_registers */
 156   NULL                                  /* next */
 157 };
 158
 159 void
 160 _initialize_core_sun3 (void)
 161 {
 162   add_core_fns (&sun3_core_fns);
 163 }