gdb/sun3-nat.c

   1 /* Host-dependent code for Sun-3 for GDB, the GNU debugger.
   2    Copyright 1986, 1987, 1989, 1991, 1992, 1993, 1996, 1999, 2000, 2001
   3    Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 #include "defs.h"
  23 #include "inferior.h"
  24 #include "gdbcore.h"
  25 #include "regcache.h"
  26
  27 #include <sys/ptrace.h>
  28 #define KERNEL                  /* To get floating point reg definitions */
  29 #include <machine/reg.h>
  30
  31 static void fetch_core_registers (char *, unsigned, int, CORE_ADDR);
  32
  33 void
  34 fetch_inferior_registers (int regno)
  35 {
  36   struct regs inferior_registers;
  37   struct fp_status inferior_fp_registers;
  38
  39   registers_fetched ();
  40
  41   ptrace (PTRACE_GETREGS, PIDGET (inferior_ptid),
  42           (PTRACE_ARG3_TYPE) & inferior_registers);
  43
  44   if (FP0_REGNUM >= 0)
  45     ptrace (PTRACE_GETFPREGS, PIDGET (inferior_ptid),
  46             (PTRACE_ARG3_TYPE) & inferior_fp_registers);
  47
  48   memcpy (registers, &inferior_registers, 16 * 4);
  49   if (FP0_REGNUM >= 0)
  50     memcpy (&registers[REGISTER_BYTE (FP0_REGNUM)], &inferior_fp_registers,
  51             sizeof inferior_fp_registers.fps_regs);
  52
  53   *(int *) &registers[REGISTER_BYTE (PS_REGNUM)] = inferior_registers.r_ps;
  54   *(int *) &registers[REGISTER_BYTE (PC_REGNUM)] = inferior_registers.r_pc;
  55   if (FP0_REGNUM >= 0)
  56     memcpy (&registers[REGISTER_BYTE (FPC_REGNUM)],
  57             &inferior_fp_registers.fps_control,
  58             sizeof inferior_fp_registers -
  59             sizeof inferior_fp_registers.fps_regs);
  60 }
  61
  62 /* Store our register values back into the inferior.
  63    If REGNO is -1, do this for all registers.
  64    Otherwise, REGNO specifies which register (so we can save time).  */
  65
  66 void
  67 store_inferior_registers (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, PIDGET (inferior_ptid),
  87           (PTRACE_ARG3_TYPE) & inferior_registers);
  88   if (FP0_REGNUM >= 0)
  89     ptrace (PTRACE_SETFPREGS, PIDGET (inferior_ptid),
  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
  96 /* Provide registers to GDB from a core file.
  97
  98    CORE_REG_SECT points to an array of bytes, which were obtained from
  99    a core file which BFD thinks might contain register contents.
 100    CORE_REG_SIZE is its size.
 101
 102    WHICH says which register set corelow suspects this is:
 103      0 --- the general-purpose register set
 104      2 --- the floating-point register set
 105
 106    REG_ADDR isn't used.  */
 107
 108 static void
 109 fetch_core_registers (char *core_reg_sect, unsigned core_reg_size,
 110                       int which, CORE_ADDR reg_addr)
 111 {
 112   struct regs *regs = (struct regs *) core_reg_sect;
 113
 114   if (which == 0)
 115     {
 116       if (core_reg_size < sizeof (struct regs))
 117           error ("Can't find registers in core file");
 118
 119       memcpy (registers, (char *) regs, 16 * 4);
 120       supply_register (PS_REGNUM, (char *) &regs->r_ps);
 121       supply_register (PC_REGNUM, (char *) &regs->r_pc);
 122
 123     }
 124   else if (which == 2)
 125     {
 126
 127 #define fpustruct  ((struct fpu *) core_reg_sect)
 128
 129       if (core_reg_size >= sizeof (struct fpu))
 130         {
 131           if (FP0_REGNUM >= 0)
 132             {
 133               memcpy (&registers[REGISTER_BYTE (FP0_REGNUM)],
 134                       fpustruct->f_fpstatus.fps_regs,
 135                       sizeof fpustruct->f_fpstatus.fps_regs);
 136               memcpy (&registers[REGISTER_BYTE (FPC_REGNUM)],
 137                       &fpustruct->f_fpstatus.fps_control,
 138                       sizeof fpustruct->f_fpstatus -
 139                       sizeof fpustruct->f_fpstatus.fps_regs);
 140             }
 141         }
 142       else
 143         fprintf_unfiltered (gdb_stderr,
 144                             "Couldn't read float regs from core file\n");
 145     }
 146 }
 147 \f
 148
 149 /* Register that we are able to handle sun3 core file formats.
 150    FIXME: is this really bfd_target_unknown_flavour? */
 151
 152 static struct core_fns sun3_core_fns =
 153 {
 154   bfd_target_unknown_flavour,           /* core_flavour */
 155   default_check_format,                 /* check_format */
 156   default_core_sniffer,                 /* core_sniffer */
 157   fetch_core_registers,                 /* core_read_registers */
 158   NULL                                  /* next */
 159 };
 160
 161 void
 162 _initialize_core_sun3 (void)
 163 {
 164   add_core_fns (&sun3_core_fns);
 165 }