swapcontext.S revision 1.7
1 1.7 joerg /* $NetBSD: swapcontext.S,v 1.7 2013/09/12 15:36:15 joerg Exp $ */ 2 1.2 thorpej 3 1.2 thorpej /*- 4 1.2 thorpej * Copyright (c) 1999 The NetBSD Foundation, Inc. 5 1.2 thorpej * All rights reserved. 6 1.2 thorpej * 7 1.2 thorpej * This code is derived from software contributed to The NetBSD Foundation 8 1.2 thorpej * by Klaus Klein. 9 1.2 thorpej * 10 1.2 thorpej * Redistribution and use in source and binary forms, with or without 11 1.2 thorpej * modification, are permitted provided that the following conditions 12 1.2 thorpej * are met: 13 1.2 thorpej * 1. Redistributions of source code must retain the above copyright 14 1.2 thorpej * notice, this list of conditions and the following disclaimer. 15 1.2 thorpej * 2. Redistributions in binary form must reproduce the above copyright 16 1.2 thorpej * notice, this list of conditions and the following disclaimer in the 17 1.2 thorpej * documentation and/or other materials provided with the distribution. 18 1.2 thorpej * 19 1.2 thorpej * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 1.2 thorpej * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 1.2 thorpej * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 1.2 thorpej * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 1.2 thorpej * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 1.2 thorpej * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 1.2 thorpej * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 1.2 thorpej * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 1.2 thorpej * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 1.2 thorpej * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 1.2 thorpej * POSSIBILITY OF SUCH DAMAGE. 30 1.2 thorpej */ 31 1.2 thorpej 32 1.2 thorpej #include <machine/asm.h> 33 1.2 thorpej #if defined(LIBC_SCCS) && !defined(lint) 34 1.7 joerg RCSID("$NetBSD: swapcontext.S,v 1.7 2013/09/12 15:36:15 joerg Exp $") 35 1.2 thorpej #endif /* LIBC_SCCS && !lint */ 36 1.2 thorpej 37 1.2 thorpej ENTRY(swapcontext) 38 1.2 thorpej movl 4(%esp),%ecx 39 1.2 thorpej PIC_PROLOGUE 40 1.2 thorpej pushl %ecx /* push oucp */ 41 1.7 joerg #ifdef __PIC__ 42 1.5 kleink call PIC_PLT(_C_LABEL(_getcontext)) 43 1.2 thorpej #else 44 1.5 kleink call _C_LABEL(_getcontext) 45 1.2 thorpej #endif 46 1.2 thorpej addl $4,%esp /* pop oucp */ 47 1.2 thorpej PIC_EPILOGUE 48 1.2 thorpej testl %eax,%eax 49 1.2 thorpej jnz 2f 50 1.2 thorpej movl 4(%esp),%ecx 51 1.2 thorpej movl 0(%esp),%edx 52 1.2 thorpej movl %edx,(36 + 14 * 4)(%ecx) /* Adjust saved %eip ... */ 53 1.7 joerg #ifdef __PIC__ 54 1.2 thorpej movl %ebx,(36 + 8 * 4)(%ecx) /* ... clobbered PIC reg ... */ 55 1.2 thorpej #endif 56 1.4 kleink leal 4(%esp),%edx 57 1.3 fvdl movl %edx,(36 + 17 * 4)(%ecx) /* ... and %esp. */ 58 1.2 thorpej /* Note: oucp->%eax has been cleared by getcontext(). */ 59 1.2 thorpej movl 8(%esp),%ecx 60 1.2 thorpej PIC_PROLOGUE 61 1.2 thorpej pushl %ecx /* push ucp */ 62 1.7 joerg #ifdef __PIC__ 63 1.2 thorpej call PIC_PLT(_C_LABEL(setcontext)) 64 1.2 thorpej #else 65 1.2 thorpej call _C_LABEL(setcontext) 66 1.2 thorpej #endif 67 1.2 thorpej addl $4,%esp /* pop ucp */ 68 1.2 thorpej PIC_EPILOGUE 69 1.2 thorpej /* No need to error-check: setcontext() must have failed. */ 70 1.2 thorpej 2: ret 71
Indexes created Sat Sep 27 14:09:57 GMT 2025