diff options
Diffstat (limited to 'gdb/i386mach-nat.c')
| -rw-r--r-- | gdb/i386mach-nat.c | 163 |
1 files changed, 163 insertions, 0 deletions
diff --git a/gdb/i386mach-nat.c b/gdb/i386mach-nat.c new file mode 100644 index 0000000..f843d7f --- /dev/null +++ b/gdb/i386mach-nat.c @@ -0,0 +1,163 @@ +/* Native dependent code for Mach 386's for GDB, the GNU debugger. + Copyright (C) 1986, 1987, 1989, 1991, 1992 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ + +#include "defs.h" +#include "frame.h" +#include "inferior.h" +#include "gdbcore.h" + +#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 "gdb_stat.h" +#include <sys/core.h> + +static void fetch_core_registers PARAMS ((char *, unsigned, int, CORE_ADDR)); + +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, + (PTRACE_ARG3_TYPE) &inferior_registers); + ptrace (PTRACE_GETFPREGS, inferior_pid, + (PTRACE_ARG3_TYPE) &inferior_fp_registers); + + memcpy (registers, &inferior_registers, sizeof inferior_registers); + + memcpy (®isters[REGISTER_BYTE (FP0_REGNUM)], + inferior_fp_registers.f_st, + sizeof inferior_fp_registers.f_st); + memcpy (®isters[REGISTER_BYTE (FPC_REGNUM)], + &inferior_fp_registers.f_ctrl, + 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[]; + + memcpy (&inferior_registers, registers, 20 * 4); + + memcpy (inferior_fp_registers.f_st,®isters[REGISTER_BYTE (FP0_REGNUM)], + sizeof inferior_fp_registers.f_st); + memcpy (&inferior_fp_registers.f_ctrl, + ®isters[REGISTER_BYTE (FPC_REGNUM)], + 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); + 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); + wait (0); + ptrace (PTRACE_POKEDATA, inferior_pid, (PTRACE_ARG3_TYPE) stack, stuff); + 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); +} + + + +/* Work with core files, for GDB. */ + +static void +fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr) + char *core_reg_sect; + unsigned core_reg_size; + int which; + CORE_ADDR reg_addr; /* Unused in this version */ +{ + int val; + extern char registers[]; + + switch (which) { + case 0: + case 1: + memcpy (registers, core_reg_sect, core_reg_size); + break; + + case 2: +#ifdef FP0_REGNUM + memcpy (®isters[REGISTER_BYTE (FP0_REGNUM)], + core_reg_sect, + core_reg_size); /* FIXME, probably bogus */ +#endif +#ifdef FPC_REGNUM + memcpy (®isters[REGISTER_BYTE (FPC_REGNUM)], + &corestr.c_fpu.f_fpstatus.f_ctrl, + sizeof corestr.c_fpu.f_fpstatus - + sizeof corestr.c_fpu.f_fpstatus.f_st); +#endif + break; + } +} + + +/* Register that we are able to handle i386mach core file formats. + FIXME: is this really bfd_target_unknown_flavour? */ + +static struct core_fns i386mach_core_fns = +{ + bfd_target_unknown_flavour, + fetch_core_registers, + NULL +}; + +void +_initialize_core_i386mach () +{ + add_core_fns (&i386mach_core_fns); +} |