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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.
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- 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
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
-
- #include "defs.h"
- #include "frame.h"
- #include "inferior.h"
- #include "signame.h"
- #include "gdbcore.h"
-
- #if defined (GDB_TARGET_IS_MACH386)
-
- #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>
-
-
- void
- fetch_inferior_registers (regno)
- int regno; /* Original value discarded */
- {
- struct regs inferior_registers;
- struct fp_state inferior_fp_registers;
- extern char registers[];
-
- registers_fetched ();
-
- ptrace (PTRACE_GETREGS, inferior_pid, &inferior_registers);
- ptrace (PTRACE_GETFPREGS, inferior_pid, &inferior_fp_registers);
-
- bcopy (&inferior_registers, registers, sizeof inferior_registers);
-
- bcopy (inferior_fp_registers.f_st,®isters[REGISTER_BYTE (FP0_REGNUM)],
- sizeof inferior_fp_registers.f_st);
- bcopy (&inferior_fp_registers.f_ctrl,
- ®isters[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
- 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 (®isters[REGISTER_BYTE (FP0_REGNUM)],inferior_fp_registers.f_st,
- sizeof inferior_fp_registers.f_st);
- bcopy (®isters[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, stack);
- int reg = inferior_registers.r_reg[EAX];
- inferior_registers.r_reg[EAX] =
- inferior_registers.r_reg[FP_REGNUM];
- ptrace (PTRACE_SETREGS, inferior_pid, &inferior_registers);
- ptrace (PTRACE_POKEDATA, inferior_pid, stack, 0xc589);
- ptrace (PTRACE_SINGLESTEP, inferior_pid, stack, 0);
- wait (0);
- ptrace (PTRACE_POKEDATA, inferior_pid, stack, stuff);
- inferior_registers.r_reg[EAX] = reg;
- }
- #endif
- ptrace (PTRACE_SETREGS, inferior_pid, &inferior_registers);
- ptrace (PTRACE_SETFPREGS, inferior_pid, &inferior_fp_registers);
- }
-
- #else /* Not mach386 target. */
-
- /* These functions shouldn't be called when we're cross-debugging. */
-
- /* ARGSUSED */
- void
- fetch_inferior_registers (regno)
- int regno;
- {
- }
-
- /* ARGSUSED */
- void
- store_inferior_registers (regno)
- int regno;
- {
- }
-
- #endif /* Not mach386 target. */
-
- /* Work with core files, for GDB. */
-
- void
- fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
- char *core_reg_sect;
- unsigned core_reg_size;
- int which;
- unsigned int reg_addr; /* Unused in this version */
- {
- int val;
- extern char registers[];
-
- switch (which) {
- case 0:
- case 1:
- bcopy (core_reg_sect, registers, core_reg_size);
- break;
-
- case 2:
- #ifdef FP0_REGNUM
- bcopy (core_reg_sect,
- ®isters[REGISTER_BYTE (FP0_REGNUM)],
- core_reg_size); /* FIXME, probably bogus */
- #endif
- #ifdef FPC_REGNUM
- bcopy (&corestr.c_fpu.f_fpstatus.f_ctrl,
- ®isters[REGISTER_BYTE (FPC_REGNUM)],
- sizeof corestr.c_fpu.f_fpstatus -
- sizeof corestr.c_fpu.f_fpstatus.f_st);
- #endif
- break;
- }
- }
-