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82b47e62fc
(i386lynx_saved_pc_after_call): Remove prototype. * i386ly-tdep.c: Include "i386-tdep.h". (i386lynx_saved_pc_after_call): Make static. Use read_memory_nobpt instead of read_memory. Use read_memory_unsigned_integer instead of read_memory_integer. (i386lynx_init_abi): New function. (i386lynx_coff_osabi_sniffer): New function. (_initialize_i386bsd_tdep): New function.
81 lines
2.4 KiB
C
81 lines
2.4 KiB
C
/* Target-dependent code for Intel 386 running LynxOS.
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Copyright 1993, 1996, 2000, 2001, 2002 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,
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Boston, MA 02111-1307, USA. */
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#include "defs.h"
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#include "gdbcore.h"
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#include "inferior.h"
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#include "regcache.h"
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#include "target.h"
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#include "i386-tdep.h"
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/* Return the PC of the caller from the call frame. Assumes the subr
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prologue has already been executed, and the frame pointer setup.
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If this is the outermost frame, we check to see if we are in a
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system call by examining the previous instruction. If so, then the
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return PC is actually at SP+4 because system calls use a different
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calling sequence. */
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static CORE_ADDR
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i386lynx_saved_pc_after_call (struct frame_info *frame)
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{
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char opcode[7];
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static const unsigned char call_inst[] =
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{ 0x9a, 0, 0, 0, 0, 8, 0 }; /* lcall 0x8,0x0 */
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read_memory_nobpt (frame->pc - 7, opcode, 7);
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if (memcmp (opcode, call_inst, 7) == 0)
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return read_memory_unsigned_integer (read_register (SP_REGNUM) + 4, 4);
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return read_memory_unsigned_integer (read_register (SP_REGNUM), 4);
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}
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/* LynxOS. */
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static void
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i386lynx_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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{
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set_gdbarch_saved_pc_after_call (gdbarch, i386lynx_saved_pc_after_call);
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}
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static enum gdb_osabi
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i386lynx_coff_osabi_sniffer (bfd *abfd)
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{
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if (strcmp (bfd_get_target (abfd), "coff-i386-lynx") == 0)
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return GDB_OSABI_LYNXOS;
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return GDB_OSABI_UNKNOWN;
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}
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/* Provide a prototype to silence -Wmissing-prototypes. */
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void _initialize_i386lynx_tdep (void);
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void
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_initialize_i386bsd_tdep (void)
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{
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gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_coff_flavour,
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i386lynx_coff_osabi_sniffer);
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gdbarch_register_osabi (bfd_arch_i386, GDB_OSABI_LYNXOS,
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i386lynx_init_abi);
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}
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