gdb/i386mach-nat.c

   1 /* Native dependent code for Mach 386's for GDB, the GNU debugger.
   2    Copyright (C) 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 "frame.h"
  23 #include "inferior.h"
  24 #include "gdbcore.h"
  25
  26 #include <sys/param.h>
  27 #include <sys/dir.h>
  28 #include <sys/user.h>
  29 #include <signal.h>
  30 #include <sys/ioctl.h>
  31 #include <fcntl.h>
  32
  33 #include <sys/ptrace.h>
  34 #include <machine/reg.h>
  35
  36 #include <sys/file.h>
  37 #include "gdb_stat.h"
  38 #include <sys/core.h>
  39
  40 static void fetch_core_registers PARAMS ((char *, unsigned, int, CORE_ADDR));
  41
  42 void
  43 fetch_inferior_registers (regno)
  44      int regno;                 /* Original value discarded */
  45 {
  46   struct regs inferior_registers;
  47   struct fp_state inferior_fp_registers;
  48
  49   registers_fetched ();
  50
  51   ptrace (PTRACE_GETREGS, inferior_pid,
  52           (PTRACE_ARG3_TYPE) & inferior_registers);
  53   ptrace (PTRACE_GETFPREGS, inferior_pid,
  54           (PTRACE_ARG3_TYPE) & inferior_fp_registers);
  55
  56   memcpy (registers, &inferior_registers, sizeof inferior_registers);
  57
  58   memcpy (&registers[REGISTER_BYTE (FP0_REGNUM)],
  59           inferior_fp_registers.f_st,
  60           sizeof inferior_fp_registers.f_st);
  61   memcpy (&registers[REGISTER_BYTE (FPC_REGNUM)],
  62           &inferior_fp_registers.f_ctrl,
  63           sizeof inferior_fp_registers - sizeof inferior_fp_registers.f_st);
  64 }
  65
  66 /* Store our register values back into the inferior.
  67    If REGNO is -1, do this for all registers.
  68    Otherwise, REGNO specifies which register (so we can save time).  */
  69
  70 void
  71 store_inferior_registers (regno)
  72      int regno;
  73 {
  74   struct regs inferior_registers;
  75   struct fp_state inferior_fp_registers;
  76
  77   memcpy (&inferior_registers, registers, 20 * 4);
  78
  79   memcpy (inferior_fp_registers.f_st, &registers[REGISTER_BYTE (FP0_REGNUM)],
  80           sizeof inferior_fp_registers.f_st);
  81   memcpy (&inferior_fp_registers.f_ctrl,
  82           &registers[REGISTER_BYTE (FPC_REGNUM)],
  83           sizeof inferior_fp_registers - sizeof inferior_fp_registers.f_st);
  84
  85 #ifdef PTRACE_FP_BUG
  86   if (regno == FP_REGNUM || regno == -1)
  87     /* Storing the frame pointer requires a gross hack, in which an
  88        instruction that moves eax into ebp gets single-stepped.  */
  89     {
  90       int stack = inferior_registers.r_reg[SP_REGNUM];
  91       int stuff = ptrace (PTRACE_PEEKDATA, inferior_pid,
  92                           (PTRACE_ARG3_TYPE) stack);
  93       int reg = inferior_registers.r_reg[EAX];
  94       inferior_registers.r_reg[EAX] =
  95         inferior_registers.r_reg[FP_REGNUM];
  96       ptrace (PTRACE_SETREGS, inferior_pid,
  97               (PTRACE_ARG3_TYPE) & inferior_registers);
  98       ptrace (PTRACE_POKEDATA, inferior_pid, (PTRACE_ARG3_TYPE) stack, 0xc589);
  99       ptrace (PTRACE_SINGLESTEP, inferior_pid, (PTRACE_ARG3_TYPE) stack, 0);
 100       wait (0);
 101       ptrace (PTRACE_POKEDATA, inferior_pid, (PTRACE_ARG3_TYPE) stack, stuff);
 102       inferior_registers.r_reg[EAX] = reg;
 103     }
 104 #endif
 105   ptrace (PTRACE_SETREGS, inferior_pid,
 106           (PTRACE_ARG3_TYPE) & inferior_registers);
 107   ptrace (PTRACE_SETFPREGS, inferior_pid,
 108           (PTRACE_ARG3_TYPE) & inferior_fp_registers);
 109 }
 110
 111
 112
 113 /* Work with core files, for GDB. */
 114
 115 static void
 116 fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
 117      char *core_reg_sect;
 118      unsigned core_reg_size;
 119      int which;
 120      CORE_ADDR reg_addr;        /* Unused in this version */
 121 {
 122   int val;
 123
 124   switch (which)
 125     {
 126     case 0:
 127     case 1:
 128       memcpy (registers, core_reg_sect, core_reg_size);
 129       break;
 130
 131     case 2:
 132 #ifdef FP0_REGNUM
 133       memcpy (&registers[REGISTER_BYTE (FP0_REGNUM)],
 134               core_reg_sect,
 135               core_reg_size);   /* FIXME, probably bogus */
 136 #endif
 137 #ifdef FPC_REGNUM
 138       memcpy (&registers[REGISTER_BYTE (FPC_REGNUM)],
 139               &corestr.c_fpu.f_fpstatus.f_ctrl,
 140               sizeof corestr.c_fpu.f_fpstatus -
 141               sizeof corestr.c_fpu.f_fpstatus.f_st);
 142 #endif
 143       break;
 144     }
 145 }
 146 \f
 147
 148 /* Register that we are able to handle i386mach core file formats.
 149    FIXME: is this really bfd_target_unknown_flavour? */
 150
 151 static struct core_fns i386mach_core_fns =
 152 {
 153   bfd_target_unknown_flavour,
 154   fetch_core_registers,
 155   NULL
 156 };
 157
 158 void
 159 _initialize_core_i386mach ()
 160 {
 161   add_core_fns (&i386mach_core_fns);
 162 }