binutils-gdb/gdb/mach386-xdep.c

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/* Machine-dependent code for host Mach 386's for GDB, the GNU debugger.
Copyright (C) 1986, 1987, 1989, 1991 Free Software Foundation, Inc.
This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include "defs.h"
#include "frame.h"
#include "inferior.h"
#include "gdbcore.h"
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#if defined (GDB_TARGET_IS_MACH386)
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#include <sys/param.h>
#include <sys/dir.h>
#include <sys/user.h>
#include <signal.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <sys/ptrace.h>
#include <machine/reg.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/core.h>
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void
fetch_inferior_registers (regno)
int regno; /* Original value discarded */
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{
struct regs inferior_registers;
struct fp_state inferior_fp_registers;
extern char registers[];
registers_fetched ();
ptrace (PTRACE_GETREGS, inferior_pid,
(PTRACE_ARG3_TYPE) &inferior_registers);
ptrace (PTRACE_GETFPREGS, inferior_pid,
(PTRACE_ARG3_TYPE) &inferior_fp_registers);
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bcopy (&inferior_registers, registers, sizeof inferior_registers);
bcopy (inferior_fp_registers.f_st,&registers[REGISTER_BYTE (FP0_REGNUM)],
sizeof inferior_fp_registers.f_st);
bcopy (&inferior_fp_registers.f_ctrl,
&registers[REGISTER_BYTE (FPC_REGNUM)],
sizeof inferior_fp_registers - sizeof inferior_fp_registers.f_st);
}
/* Store our register values back into the inferior.
If REGNO is -1, do this for all registers.
Otherwise, REGNO specifies which register (so we can save time). */
void
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store_inferior_registers (regno)
int regno;
{
struct regs inferior_registers;
struct fp_state inferior_fp_registers;
extern char registers[];
bcopy (registers, &inferior_registers, 20 * 4);
bcopy (&registers[REGISTER_BYTE (FP0_REGNUM)],inferior_fp_registers.f_st,
sizeof inferior_fp_registers.f_st);
bcopy (&registers[REGISTER_BYTE (FPC_REGNUM)],
&inferior_fp_registers.f_ctrl,
sizeof inferior_fp_registers - sizeof inferior_fp_registers.f_st);
#ifdef PTRACE_FP_BUG
if (regno == FP_REGNUM || regno == -1)
/* Storing the frame pointer requires a gross hack, in which an
instruction that moves eax into ebp gets single-stepped. */
{
int stack = inferior_registers.r_reg[SP_REGNUM];
int stuff = ptrace (PTRACE_PEEKDATA, inferior_pid,
(PTRACE_ARG3_TYPE) stack);
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int reg = inferior_registers.r_reg[EAX];
inferior_registers.r_reg[EAX] =
inferior_registers.r_reg[FP_REGNUM];
ptrace (PTRACE_SETREGS, inferior_pid,
(PTRACE_ARG3_TYPE) &inferior_registers);
ptrace (PTRACE_POKEDATA, inferior_pid, (PTRACE_ARG3_TYPE) stack, 0xc589);
ptrace (PTRACE_SINGLESTEP, inferior_pid, (PTRACE_ARG3_TYPE) stack, 0);
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wait (0);
ptrace (PTRACE_POKEDATA, inferior_pid, (PTRACE_ARG3_TYPE) stack, stuff);
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inferior_registers.r_reg[EAX] = reg;
}
#endif
ptrace (PTRACE_SETREGS, inferior_pid,
(PTRACE_ARG3_TYPE) &inferior_registers);
ptrace (PTRACE_SETFPREGS, inferior_pid,
(PTRACE_ARG3_TYPE) &inferior_fp_registers);
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}
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#else /* Not mach386 target. */
/* These functions shouldn't be called when we're cross-debugging. */
/* ARGSUSED */
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void
fetch_inferior_registers (regno)
int regno;
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{
}
/* ARGSUSED */
void
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store_inferior_registers (regno)
int regno;
{
}
#endif /* Not mach386 target. */
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/* Work with core files, for GDB. */
void
fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
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char *core_reg_sect;
unsigned core_reg_size;
int which;
unsigned int reg_addr; /* Unused in this version */
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{
int val;
extern char registers[];
switch (which) {
case 0:
case 1:
bcopy (core_reg_sect, registers, core_reg_size);
break;
case 2:
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#ifdef FP0_REGNUM
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bcopy (core_reg_sect,
&registers[REGISTER_BYTE (FP0_REGNUM)],
core_reg_size); /* FIXME, probably bogus */
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#endif
#ifdef FPC_REGNUM
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bcopy (&corestr.c_fpu.f_fpstatus.f_ctrl,
&registers[REGISTER_BYTE (FPC_REGNUM)],
sizeof corestr.c_fpu.f_fpstatus -
sizeof corestr.c_fpu.f_fpstatus.f_st);
#endif
break;
}
}