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 "defs.h"
  21 #include "frame.h"
  22 #include "inferior.h"
  23 #include "gdbcore.h"
  24
  25 #if defined (GDB_TARGET_IS_MACH386)
  26
  27 #include <sys/param.h>
  28 #include <sys/dir.h>
  29 #include <sys/user.h>
  30 #include <signal.h>
  31 #include <sys/ioctl.h>
  32 #include <fcntl.h>
  33
  34 #include <sys/ptrace.h>
  35 #include <machine/reg.h>
  36
  37 #include <sys/file.h>
  38 #include <sys/stat.h>
  39 #include <sys/core.h>
  40
  41 \f
  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   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 void
  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 /* ARGSUSED */
 111 void
 112 fetch_inferior_registers (regno)
 113      int regno;
 114 {
 115 }
 116
 117 /* ARGSUSED */
 118 void
 119 store_inferior_registers (regno)
 120      int regno;
 121 {
 122 }
 123
 124 #endif /* Not mach386 target.  */
 125
 126 /* Work with core files, for GDB. */
 127
 128 void
 129 fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
 130      char *core_reg_sect;
 131      unsigned core_reg_size;
 132      int which;
 133      unsigned int reg_addr;     /* Unused in this version */
 134 {
 135   int val;
 136   extern char registers[];
 137
 138   switch (which) {
 139   case 0:
 140   case 1:
 141     bcopy (core_reg_sect, registers, core_reg_size);
 142     break;
 143
 144   case 2:
 145 #ifdef FP0_REGNUM
 146     bcopy (core_reg_sect,
 147            &registers[REGISTER_BYTE (FP0_REGNUM)],
 148            core_reg_size);              /* FIXME, probably bogus */
 149 #endif
 150 #ifdef FPC_REGNUM
 151     bcopy (&corestr.c_fpu.f_fpstatus.f_ctrl,
 152            &registers[REGISTER_BYTE (FPC_REGNUM)],
 153            sizeof corestr.c_fpu.f_fpstatus -
 154            sizeof corestr.c_fpu.f_fpstatus.f_st);
 155 #endif
 156     break;
 157   }
 158 }