164 lines
4.7 KiB
C
164 lines
4.7 KiB
C
/* Native dependent code for Mach 386's for GDB, the GNU debugger.
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Copyright (C) 1986, 1987, 1989, 1991, 1992 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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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 "gdbcore.h"
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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 "gdb_stat.h"
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#include <sys/core.h>
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static void fetch_core_registers PARAMS ((char *, unsigned, int, CORE_ADDR));
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void
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fetch_inferior_registers (regno)
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int regno; /* Original value discarded */
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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,
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(PTRACE_ARG3_TYPE) &inferior_registers);
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ptrace (PTRACE_GETFPREGS, inferior_pid,
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(PTRACE_ARG3_TYPE) &inferior_fp_registers);
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memcpy (registers, &inferior_registers, sizeof inferior_registers);
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memcpy (®isters[REGISTER_BYTE (FP0_REGNUM)],
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inferior_fp_registers.f_st,
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sizeof inferior_fp_registers.f_st);
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memcpy (®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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}
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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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void
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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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memcpy (&inferior_registers, registers, 20 * 4);
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memcpy (inferior_fp_registers.f_st,®isters[REGISTER_BYTE (FP0_REGNUM)],
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sizeof inferior_fp_registers.f_st);
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memcpy (&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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#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,
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(PTRACE_ARG3_TYPE) 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,
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(PTRACE_ARG3_TYPE) &inferior_registers);
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ptrace (PTRACE_POKEDATA, inferior_pid, (PTRACE_ARG3_TYPE) stack, 0xc589);
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ptrace (PTRACE_SINGLESTEP, inferior_pid, (PTRACE_ARG3_TYPE) stack, 0);
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wait (0);
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ptrace (PTRACE_POKEDATA, inferior_pid, (PTRACE_ARG3_TYPE) 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,
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(PTRACE_ARG3_TYPE) &inferior_registers);
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ptrace (PTRACE_SETFPREGS, inferior_pid,
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(PTRACE_ARG3_TYPE) &inferior_fp_registers);
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}
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/* Work with core files, for GDB. */
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static void
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fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
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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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CORE_ADDR reg_addr; /* Unused in this version */
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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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memcpy (registers, core_reg_sect, 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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memcpy (®isters[REGISTER_BYTE (FP0_REGNUM)],
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core_reg_sect,
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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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memcpy (®isters[REGISTER_BYTE (FPC_REGNUM)],
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&corestr.c_fpu.f_fpstatus.f_ctrl,
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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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/* Register that we are able to handle i386mach core file formats.
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FIXME: is this really bfd_target_unknown_flavour? */
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static struct core_fns i386mach_core_fns =
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{
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bfd_target_unknown_flavour,
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fetch_core_registers,
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NULL
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};
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void
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_initialize_core_i386mach ()
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{
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add_core_fns (&i386mach_core_fns);
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}
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