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
  43 \f
  44 void
  45 fetch_inferior_registers (regno)
  46      int regno;         /* Original value discarded */
  47 {
  48   struct regs inferior_registers;
  49   struct fp_state inferior_fp_registers;
  50   extern char registers[];
  51
  52   registers_fetched ();
  53
  54   ptrace (PTRACE_GETREGS, inferior_pid, &inferior_registers);
  55   ptrace (PTRACE_GETFPREGS, inferior_pid, &inferior_fp_registers);
  56
  57   bcopy (&inferior_registers, registers, sizeof inferior_registers);
  58
  59   bcopy (inferior_fp_registers.f_st,&registers[REGISTER_BYTE (FP0_REGNUM)],
  60          sizeof inferior_fp_registers.f_st);
  61   bcopy (&inferior_fp_registers.f_ctrl,
  62          &registers[REGISTER_BYTE (FPC_REGNUM)],
  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   extern char registers[];
  77
  78   bcopy (registers, &inferior_registers, 20 * 4);
  79
  80   bcopy (&registers[REGISTER_BYTE (FP0_REGNUM)],inferior_fp_registers.f_st,
  81          sizeof inferior_fp_registers.f_st);
  82   bcopy (&registers[REGISTER_BYTE (FPC_REGNUM)],
  83          &inferior_fp_registers.f_ctrl,
  84          sizeof inferior_fp_registers - sizeof inferior_fp_registers.f_st);
  85
  86 #ifdef PTRACE_FP_BUG
  87   if (regno == FP_REGNUM || regno == -1)
  88     /* Storing the frame pointer requires a gross hack, in which an
  89        instruction that moves eax into ebp gets single-stepped.  */
  90     {
  91       int stack = inferior_registers.r_reg[SP_REGNUM];
  92       int stuff = ptrace (PTRACE_PEEKDATA, inferior_pid, 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, &inferior_registers);
  97       ptrace (PTRACE_POKEDATA, inferior_pid, stack, 0xc589);
  98       ptrace (PTRACE_SINGLESTEP, inferior_pid, stack, 0);
  99       wait (0);
 100       ptrace (PTRACE_POKEDATA, inferior_pid, stack, stuff);
 101       inferior_registers.r_reg[EAX] = reg;
 102     }
 103 #endif
 104   ptrace (PTRACE_SETREGS, inferior_pid, &inferior_registers);
 105   ptrace (PTRACE_SETFPREGS, inferior_pid, &inferior_fp_registers);
 106 }
 107
 108 #else /* Not mach386 target.  */
 109
 110 /* These functions shouldn't be called when we're cross-debugging.  */
 111
 112 /* ARGSUSED */
 113 void
 114 fetch_inferior_registers (regno)
 115      int regno;
 116 {
 117 }
 118
 119 /* ARGSUSED */
 120 void
 121 store_inferior_registers (regno)
 122      int regno;
 123 {
 124 }
 125
 126 #endif /* Not mach386 target.  */
 127
 128 /* Work with core files, for GDB. */
 129
 130 void
 131 fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
 132      char *core_reg_sect;
 133      unsigned core_reg_size;
 134      int which;
 135      unsigned int reg_addr;     /* Unused in this version */
 136 {
 137   int val;
 138   extern char registers[];
 139
 140   switch (which) {
 141   case 0:
 142   case 1:
 143     bcopy (core_reg_sect, registers, core_reg_size);
 144     break;
 145
 146   case 2:
 147 #ifdef FP0_REGNUM
 148     bcopy (core_reg_sect,
 149            &registers[REGISTER_BYTE (FP0_REGNUM)],
 150            core_reg_size);              /* FIXME, probably bogus */
 151 #endif
 152 #ifdef FPC_REGNUM
 153     bcopy (&corestr.c_fpu.f_fpstatus.f_ctrl,
 154            &registers[REGISTER_BYTE (FPC_REGNUM)],
 155            sizeof corestr.c_fpu.f_fpstatus -
 156            sizeof corestr.c_fpu.f_fpstatus.f_st);
 157 #endif
 158     break;
 159   }
 160 }