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 "param.h"
  23 #include "frame.h"
  24 #include "inferior.h"
  25 #include "signame.h"
  26 #include "gdbcore.h"
  27
  28 #if defined (GDB_TARGET_IS_MACH386)
  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 #else /* Not mach386 target.  */
 107
 108 /* These functions shouldn't be called when we're cross-debugging.  */
 109
 110 void
 111 fetch_inferior_registers ()
 112 {
 113 }
 114
 115 /* ARGSUSED */
 116 store_inferior_registers (regno)
 117      int regno;
 118 {
 119 }
 120
 121 #endif /* Not mach386 target.  */
 122
 123 /* Work with core files, for GDB. */
 124
 125 void
 126 fetch_core_registers (core_reg_sect, core_reg_size, which)
 127      char *core_reg_sect;
 128      unsigned core_reg_size;
 129      int which;
 130 {
 131   int val;
 132   extern char registers[];
 133
 134   switch (which) {
 135   case 0:
 136   case 1:
 137     bcopy (core_reg_sect, registers, core_reg_size);
 138     break;
 139
 140   case 2:
 141 #ifdef FP0_REGNUM
 142     bcopy (core_reg_sect,
 143            &registers[REGISTER_BYTE (FP0_REGNUM)],
 144            core_reg_size);              /* FIXME, probably bogus */
 145 #endif
 146 #ifdef FPC_REGNUM
 147     bcopy (&corestr.c_fpu.f_fpstatus.f_ctrl,
 148            &registers[REGISTER_BYTE (FPC_REGNUM)],
 149            sizeof corestr.c_fpu.f_fpstatus -
 150            sizeof corestr.c_fpu.f_fpstatus.f_st);
 151 #endif
 152     break;
 153   }
 154 }