swapcontext.S revision 1.4
1 /* $NetBSD: swapcontext.S,v 1.4 2003/04/07 19:44:40 kleink Exp $ */ 2 3 /*- 4 * Copyright (c) 1999 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Klaus Klein. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 #include <machine/asm.h> 40 #if defined(LIBC_SCCS) && !defined(lint) 41 RCSID("$NetBSD: swapcontext.S,v 1.4 2003/04/07 19:44:40 kleink Exp $") 42 #endif /* LIBC_SCCS && !lint */ 43 44 ENTRY(swapcontext) 45 movl 4(%esp),%ecx 46 PIC_PROLOGUE 47 pushl %ecx /* push oucp */ 48 #ifdef PIC 49 call PIC_PLT(_C_LABEL(getcontext)) 50 #else 51 call _C_LABEL(getcontext) 52 #endif 53 addl $4,%esp /* pop oucp */ 54 PIC_EPILOGUE 55 testl %eax,%eax 56 jnz 2f 57 movl 4(%esp),%ecx 58 movl 0(%esp),%edx 59 movl %edx,(36 + 14 * 4)(%ecx) /* Adjust saved %eip ... */ 60 #ifdef PIC 61 movl %ebx,(36 + 8 * 4)(%ecx) /* ... clobbered PIC reg ... */ 62 #endif 63 leal 4(%esp),%edx 64 movl %edx,(36 + 17 * 4)(%ecx) /* ... and %esp. */ 65 /* Note: oucp->%eax has been cleared by getcontext(). */ 66 movl 8(%esp),%ecx 67 PIC_PROLOGUE 68 pushl %ecx /* push ucp */ 69 #ifdef PIC 70 call PIC_PLT(_C_LABEL(setcontext)) 71 #else 72 call _C_LABEL(setcontext) 73 #endif 74 addl $4,%esp /* pop ucp */ 75 PIC_EPILOGUE 76 /* No need to error-check: setcontext() must have failed. */ 77 2: ret 78
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