46 lines
1.7 KiB
C
46 lines
1.7 KiB
C
/* Target-dependent code for Intel 386 running LynxOS.
|
|
Copyright 1993, 1996, 2000, 2001 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 "inferior.h"
|
|
#include "target.h"
|
|
#include "gdbcore.h"
|
|
#include "regcache.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. */
|
|
|
|
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 (frame->pc - 7, opcode, 7);
|
|
if (memcmp (opcode, call_inst, 7) == 0)
|
|
return read_memory_integer (read_register (SP_REGNUM) + 4, 4);
|
|
|
|
return read_memory_integer (read_register (SP_REGNUM), 4);
|
|
}
|