/* Copyright (C) 2008 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by David Bartley <dtbartle@csclub.uwaterloo.ca>, 2008.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library 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
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#include <sysdep.h>

#include "ucontext_i.h"

/* note: make sure that we do not use %edx as a scratch (see swapcontext.S) */

ENTRY(__getcontext)
	/* load ucp (arg) into %ecx */
	movl 4(%esp), %ecx

	/* load return address into %eax */
	movl 0(%esp), %eax

	/* push ucp, subcall number, and return address */
	pushl %ecx; cfi_adjust_cfa_offset (4)
	pushl $SYS_SUB_getcontext; cfi_adjust_cfa_offset (4)
	pushl %eax; cfi_adjust_cfa_offset (4)

	/* call context syscall */
	DO_CALL(context, 2)

	/* Jump if not error.  */
	jnb 1f;

	/* pop args from stack */
	addl $12, %esp; cfi_adjust_cfa_offset (-12)

	/* Jump to error label.  */
	jmp SYSCALL_ERROR_LABEL;

1:
	/* pop args from stack */
	addl $12, %esp; cfi_adjust_cfa_offset (-12);

	/* load ucp (arg) into %ecx */
	movl 4(%esp), %ecx

	/* save %esp */
	leal 4(%esp), %eax
	movl %eax, oUESP(%ecx)

	/* save %eip */
	movl 0(%esp), %eax
	movl %eax, oEIP(%ecx)

	/* return 0 on success */
	xorl %eax, %eax
	movl %eax, oEAX(%ecx)
L(pseudo_end):
	ret
PSEUDO_END(__getcontext)

weak_alias (__getcontext, getcontext)