gdb/mach386-xdep.c

   1 /* Machine-dependent code for host Mach 386's for GDB, the GNU debugger.
   2    Copyright (C) 1986, 1987, 1989, 1991 Free Software Foundation, Inc.
   3
   4 This file is part of GDB.
   5
   6 GDB 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 1, or (at your option)
   9 any later version.
  10
  11 GDB 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 GDB; see the file COPYING.  If not, write to
  18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20 #if defined (GDB_TARGET_IS_MACH386)
  21
  22 #include <stdio.h>
  23 #include "defs.h"
  24 #include "param.h"
  25 #include "frame.h"
  26 #include "inferior.h"
  27 #include "signame.h"
  28 #include "gdbcore.h"
  29
  30 #include <sys/param.h>
  31 #include <sys/dir.h>
  32 #include <sys/user.h>
  33 #include <signal.h>
  34 #include <sys/ioctl.h>
  35 #include <fcntl.h>
  36
  37 #include <sys/ptrace.h>
  38 #include <machine/reg.h>
  39
  40 #include <sys/file.h>
  41 #include <sys/stat.h>
  42 #include <sys/core.h>
  43 \f
  44 void
  45 fetch_inferior_registers ()
  46 {
  47   struct regs inferior_registers;
  48   struct fp_state inferior_fp_registers;
  49   extern char registers[];
  50
  51   registers_fetched ();
  52
  53   ptrace (PTRACE_GETREGS, inferior_pid, &inferior_registers);
  54   ptrace (PTRACE_GETFPREGS, inferior_pid, &inferior_fp_registers);
  55
  56   bcopy (&inferior_registers, registers, sizeof inferior_registers);
  57
  58   bcopy (inferior_fp_registers.f_st,&registers[REGISTER_BYTE (FP0_REGNUM)],
  59          sizeof inferior_fp_registers.f_st);
  60   bcopy (&inferior_fp_registers.f_ctrl,
  61          &registers[REGISTER_BYTE (FPC_REGNUM)],
  62          sizeof inferior_fp_registers - sizeof inferior_fp_registers.f_st);
  63 }
  64
  65 /* Store our register values back into the inferior.
  66    If REGNO is -1, do this for all registers.
  67    Otherwise, REGNO specifies which register (so we can save time).  */
  68
  69 store_inferior_registers (regno)
  70      int regno;
  71 {
  72   struct regs inferior_registers;
  73   struct fp_state inferior_fp_registers;
  74   extern char registers[];
  75
  76   bcopy (registers, &inferior_registers, 20 * 4);
  77
  78   bcopy (&registers[REGISTER_BYTE (FP0_REGNUM)],inferior_fp_registers.f_st,
  79          sizeof inferior_fp_registers.f_st);
  80   bcopy (&registers[REGISTER_BYTE (FPC_REGNUM)],
  81          &inferior_fp_registers.f_ctrl,
  82          sizeof inferior_fp_registers - sizeof inferior_fp_registers.f_st);
  83
  84 #ifdef PTRACE_FP_BUG
  85   if (regno == FP_REGNUM || regno == -1)
  86     /* Storing the frame pointer requires a gross hack, in which an
  87        instruction that moves eax into ebp gets single-stepped.  */
  88     {
  89       int stack = inferior_registers.r_reg[SP_REGNUM];
  90       int stuff = ptrace (PTRACE_PEEKDATA, inferior_pid, stack);
  91       int reg = inferior_registers.r_reg[EAX];
  92       inferior_registers.r_reg[EAX] =
  93         inferior_registers.r_reg[FP_REGNUM];
  94       ptrace (PTRACE_SETREGS, inferior_pid, &inferior_registers);
  95       ptrace (PTRACE_POKEDATA, inferior_pid, stack, 0xc589);
  96       ptrace (PTRACE_SINGLESTEP, inferior_pid, stack, 0);
  97       wait (0);
  98       ptrace (PTRACE_POKEDATA, inferior_pid, stack, stuff);
  99       inferior_registers.r_reg[EAX] = reg;
 100     }
 101 #endif
 102   ptrace (PTRACE_SETREGS, inferior_pid, &inferior_registers);
 103   ptrace (PTRACE_SETFPREGS, inferior_pid, &inferior_fp_registers);
 104 }
 105
 106 /* Machine-dependent code which would otherwise be in core.c */
 107 /* Work with core files, for GDB. */
 108
 109 \f
 110 void
 111 fetch_core_registers (core_reg_sect, core_reg_size, which)
 112      char *core_reg_sect;
 113      unsigned core_reg_size;
 114      int which;
 115 {
 116   int val;
 117   extern char registers[];
 118
 119   switch (which) {
 120   case 0:
 121   case 1:
 122     bcopy (core_reg_sect, registers, core_reg_size);
 123     break;
 124
 125   case 2:
 126     bcopy (core_reg_sect,
 127            &registers[REGISTER_BYTE (FP0_REGNUM)],
 128            core_reg_size);              /* FIXME, probably bogus */
 129 #if 0
 130     bcopy (&corestr.c_fpu.f_fpstatus.f_ctrl,
 131            &registers[REGISTER_BYTE (FPC_REGNUM)],
 132            sizeof corestr.c_fpu.f_fpstatus -
 133            sizeof corestr.c_fpu.f_fpstatus.f_st);
 134 #endif
 135     break;
 136   }
 137 }
 138 #else /* Not mach386 target.  */
 139
 140 /* These functions shouldn't be called when we're cross-debugging.  */
 141
 142 void
 143 fetch_inferior_registers ()
 144 {
 145 }
 146
 147 /* ARGSUSED */
 148 store_inferior_registers (regno)
 149      int regno;
 150 {
 151 }
 152
 153 /* ARGSUSED */
 154 void
 155 fetch_core_registers (core_reg_sect, core_reg_size, which)
 156      char *core_reg_sect;
 157      unsigned core_reg_size;
 158      int which;
 159 {
 160 }
 161
 162 #endif /* Not mach386 target.  */