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