| /* Target-dependent code for Intel 386 running LynxOS. |
| Copyright 1993, 1996, 2000, 2001, 2002 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 "gdbcore.h" |
| #include "inferior.h" |
| #include "regcache.h" |
| #include "target.h" |
| |
| #include "i386-tdep.h" |
| |
| /* Return the PC of the caller from the call frame. Assumes the subr |
| prologue has already been executed, and the frame pointer setup. |
| If this is the outermost frame, we check to see if we are in a |
| system call by examining the previous instruction. If so, then the |
| return PC is actually at SP+4 because system calls use a different |
| calling sequence. */ |
| |
| static CORE_ADDR |
| i386lynx_saved_pc_after_call (struct frame_info *frame) |
| { |
| char opcode[7]; |
| static const unsigned char call_inst[] = |
| { 0x9a, 0, 0, 0, 0, 8, 0 }; /* lcall 0x8,0x0 */ |
| |
| read_memory_nobpt (frame->pc - 7, opcode, 7); |
| if (memcmp (opcode, call_inst, 7) == 0) |
| return read_memory_unsigned_integer (read_register (SP_REGNUM) + 4, 4); |
| |
| return read_memory_unsigned_integer (read_register (SP_REGNUM), 4); |
| } |
| |
| |
| /* LynxOS. */ |
| static void |
| i386lynx_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| { |
| set_gdbarch_saved_pc_after_call (gdbarch, i386lynx_saved_pc_after_call); |
| } |
| |
| |
| static enum gdb_osabi |
| i386lynx_coff_osabi_sniffer (bfd *abfd) |
| { |
| if (strcmp (bfd_get_target (abfd), "coff-i386-lynx") == 0) |
| return GDB_OSABI_LYNXOS; |
| |
| return GDB_OSABI_UNKNOWN; |
| } |
| |
| |
| /* Provide a prototype to silence -Wmissing-prototypes. */ |
| void _initialize_i386lynx_tdep (void); |
| |
| void |
| _initialize_i386bsd_tdep (void) |
| { |
| gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_coff_flavour, |
| i386lynx_coff_osabi_sniffer); |
| |
| gdbarch_register_osabi (bfd_arch_i386, GDB_OSABI_LYNXOS, |
| i386lynx_init_abi); |
| } |