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[/] [or1k/] [trunk/] [insight/] [gdb/] [i386ly-tdep.c] - Blame information for rev 1774

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1 578 markom
/* Target-dependent code for Intel 386 running LynxOS.
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   Copyright 1993, 1996, 2000, 2001 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 "inferior.h"
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#include "target.h"
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#include "gdbcore.h"
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#include "regcache.h"
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/* Return the PC of the caller from the call frame.  Assumes the subr prologue
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   has already been executed, and the frame pointer setup.  If this is the
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   outermost frame, we check to see if we are in a system call by examining the
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   previous instruction.  If so, then the return PC is actually at SP+4 because
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   system calls use a different calling sequence.  */
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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 (frame->pc - 7, opcode, 7);
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  if (memcmp (opcode, call_inst, 7) == 0)
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    return read_memory_integer (read_register (SP_REGNUM) + 4, 4);
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  return read_memory_integer (read_register (SP_REGNUM), 4);
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}

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