154 lines
4.2 KiB
C
154 lines
4.2 KiB
C
/* Machine-dependent code for host Mach 386's for GDB, the GNU debugger.
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Copyright (C) 1986, 1987, 1989, 1991 Free Software Foundation, Inc.
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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
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(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
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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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
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include <stdio.h>
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#include "defs.h"
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#include "frame.h"
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#include "inferior.h"
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#include "signame.h"
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#include "gdbcore.h"
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#if defined (GDB_TARGET_IS_MACH386)
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#include <sys/param.h>
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#include <sys/dir.h>
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#include <sys/user.h>
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#include <signal.h>
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#include <sys/ioctl.h>
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#include <fcntl.h>
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#include <sys/ptrace.h>
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#include <machine/reg.h>
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#include <sys/file.h>
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#include <sys/stat.h>
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#include <sys/core.h>
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void
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fetch_inferior_registers ()
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{
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struct regs inferior_registers;
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struct fp_state inferior_fp_registers;
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extern char registers[];
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registers_fetched ();
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ptrace (PTRACE_GETREGS, inferior_pid, &inferior_registers);
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ptrace (PTRACE_GETFPREGS, inferior_pid, &inferior_fp_registers);
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bcopy (&inferior_registers, registers, sizeof inferior_registers);
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bcopy (inferior_fp_registers.f_st,®isters[REGISTER_BYTE (FP0_REGNUM)],
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sizeof inferior_fp_registers.f_st);
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bcopy (&inferior_fp_registers.f_ctrl,
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®isters[REGISTER_BYTE (FPC_REGNUM)],
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sizeof inferior_fp_registers - sizeof inferior_fp_registers.f_st);
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}
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/* Store our register values back into the inferior.
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If REGNO is -1, do this for all registers.
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Otherwise, REGNO specifies which register (so we can save time). */
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store_inferior_registers (regno)
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int regno;
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{
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struct regs inferior_registers;
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struct fp_state inferior_fp_registers;
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extern char registers[];
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bcopy (registers, &inferior_registers, 20 * 4);
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bcopy (®isters[REGISTER_BYTE (FP0_REGNUM)],inferior_fp_registers.f_st,
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sizeof inferior_fp_registers.f_st);
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bcopy (®isters[REGISTER_BYTE (FPC_REGNUM)],
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&inferior_fp_registers.f_ctrl,
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sizeof inferior_fp_registers - sizeof inferior_fp_registers.f_st);
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#ifdef PTRACE_FP_BUG
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if (regno == FP_REGNUM || regno == -1)
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/* Storing the frame pointer requires a gross hack, in which an
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instruction that moves eax into ebp gets single-stepped. */
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{
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int stack = inferior_registers.r_reg[SP_REGNUM];
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int stuff = ptrace (PTRACE_PEEKDATA, inferior_pid, stack);
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int reg = inferior_registers.r_reg[EAX];
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inferior_registers.r_reg[EAX] =
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inferior_registers.r_reg[FP_REGNUM];
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ptrace (PTRACE_SETREGS, inferior_pid, &inferior_registers);
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ptrace (PTRACE_POKEDATA, inferior_pid, stack, 0xc589);
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ptrace (PTRACE_SINGLESTEP, inferior_pid, stack, 0);
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wait (0);
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ptrace (PTRACE_POKEDATA, inferior_pid, stack, stuff);
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inferior_registers.r_reg[EAX] = reg;
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}
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#endif
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ptrace (PTRACE_SETREGS, inferior_pid, &inferior_registers);
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ptrace (PTRACE_SETFPREGS, inferior_pid, &inferior_fp_registers);
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}
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#else /* Not mach386 target. */
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/* These functions shouldn't be called when we're cross-debugging. */
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void
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fetch_inferior_registers ()
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{
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}
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/* ARGSUSED */
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store_inferior_registers (regno)
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int regno;
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{
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}
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#endif /* Not mach386 target. */
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/* Work with core files, for GDB. */
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void
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fetch_core_registers (core_reg_sect, core_reg_size, which)
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char *core_reg_sect;
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unsigned core_reg_size;
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int which;
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{
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int val;
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extern char registers[];
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switch (which) {
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case 0:
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case 1:
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bcopy (core_reg_sect, registers, core_reg_size);
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break;
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case 2:
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#ifdef FP0_REGNUM
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bcopy (core_reg_sect,
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®isters[REGISTER_BYTE (FP0_REGNUM)],
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core_reg_size); /* FIXME, probably bogus */
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#endif
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#ifdef FPC_REGNUM
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bcopy (&corestr.c_fpu.f_fpstatus.f_ctrl,
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®isters[REGISTER_BYTE (FPC_REGNUM)],
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sizeof corestr.c_fpu.f_fpstatus -
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sizeof corestr.c_fpu.f_fpstatus.f_st);
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#endif
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break;
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}
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}
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