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/* 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)
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