84 lines
2.8 KiB
ArmAsm
84 lines
2.8 KiB
ArmAsm
|
/* $NetBSD: resumecontext.S,v 1.6 2008/04/28 20:22:56 martin Exp $ */
|
||
|
|
|
||
|
|
/*-
|
||
|
|
* Copyright (c) 1999 The NetBSD Foundation, Inc.
|
||
|
|
* All rights reserved.
|
||
|
|
*
|
||
|
|
* This code is derived from software contributed to The NetBSD Foundation
|
||
|
|
* by Klaus Klein.
|
||
|
|
*
|
||
|
|
* Redistribution and use in source and binary forms, with or without
|
||
|
|
* modification, are permitted provided that the following conditions
|
||
|
|
* are met:
|
||
|
|
* 1. Redistributions of source code must retain the above copyright
|
||
|
|
* notice, this list of conditions and the following disclaimer.
|
||
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
||
|
|
* notice, this list of conditions and the following disclaimer in the
|
||
|
|
* documentation and/or other materials provided with the distribution.
|
||
|
|
*
|
||
|
|
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
|
||
|
|
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
|
||
|
|
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
||
|
|
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
|
||
|
|
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
||
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
||
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
||
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
||
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
||
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
||
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <machine/asm.h>
|
||
|
|
#include "SYS.h"
|
||
|
|
|
||
|
|
#if defined(LIBC_SCCS) && !defined(lint)
|
||
|
|
RCSID("$NetBSD: resumecontext.S,v 1.6 2008/04/28 20:22:56 martin Exp $")
|
||
|
|
#endif /* LIBC_SCCS && !lint */
|
||
|
|
|
||
|
|
/*
|
||
|
|
* This assembly-language implementation differs from the (obvious)
|
||
|
|
* C-language implementation only in not clobbering the previous
|
||
|
|
* function's return address (us), which is the point of the exercise.
|
||
|
|
*/
|
||
|
|
|
||
|
|
NENTRY(_resumecontext) /* profiling prologue would clobber TOS */
|
||
|
|
leal -(4 + 776)(%esp),%ecx /* retaddr + sizeof (ucontext_t) */
|
||
|
|
andl $~(0xf),%ecx /* align on _UC_UCONTEXT_ALIGN */
|
||
|
|
movl %ecx,%esp
|
||
|
|
PIC_PROLOGUE
|
||
|
|
pushl %ecx
|
||
|
|
#ifdef PIC
|
||
|
|
call PIC_PLT(_C_LABEL(_getcontext))
|
||
|
|
#else
|
||
|
|
call _C_LABEL(_getcontext)
|
||
|
|
#endif
|
||
|
|
addl $4,%esp
|
||
|
|
PIC_EPILOGUE
|
||
|
|
movl 4(%esp),%ecx /* uc_link */
|
||
|
|
PIC_PROLOGUE
|
||
|
|
pushl %ecx /* argument for exit() or setcontext() */
|
||
|
|
testl %ecx,%ecx /* link end? */
|
||
|
|
jnz 9f /* watch out for local label use in PIC_* */
|
||
|
|
|
||
|
|
/* normal exit */
|
||
|
|
#ifdef PIC
|
||
|
|
call PIC_PLT(_C_LABEL(exit))
|
||
|
|
#else
|
||
|
|
call _C_LABEL(exit)
|
||
|
|
#endif
|
||
|
|
/* NOTREACHED */
|
||
|
|
|
||
|
|
9:
|
||
|
|
#ifdef PIC
|
||
|
|
call PIC_PLT(_C_LABEL(setcontext))
|
||
|
|
#else
|
||
|
|
call _C_LABEL(setcontext)
|
||
|
|
#endif
|
||
|
|
/* NOTREACHED */
|
||
|
|
|
||
|
|
/* something is wrong, pull the brake */
|
||
|
|
pushl $-1
|
||
|
|
pushl %eax /* unused return address */
|
||
|
|
SYSTRAP(exit)
|