swapcontext.S revision 1.1
1 1.1 fvdl /* $NetBSD: swapcontext.S,v 1.1 2003/01/30 02:07:31 fvdl Exp $ */ 2 1.1 fvdl 3 1.1 fvdl /* 4 1.1 fvdl * Copyright (c) 2003 Wasabi Systems, Inc. 5 1.1 fvdl * All rights reserved. 6 1.1 fvdl * 7 1.1 fvdl * Written by Frank van der Linden for Wasabi Systems, Inc. 8 1.1 fvdl * 9 1.1 fvdl * Redistribution and use in source and binary forms, with or without 10 1.1 fvdl * modification, are permitted provided that the following conditions 11 1.1 fvdl * are met: 12 1.1 fvdl * 1. Redistributions of source code must retain the above copyright 13 1.1 fvdl * notice, this list of conditions and the following disclaimer. 14 1.1 fvdl * 2. Redistributions in binary form must reproduce the above copyright 15 1.1 fvdl * notice, this list of conditions and the following disclaimer in the 16 1.1 fvdl * documentation and/or other materials provided with the distribution. 17 1.1 fvdl * 3. All advertising materials mentioning features or use of this software 18 1.1 fvdl * must display the following acknowledgement: 19 1.1 fvdl * This product includes software developed for the NetBSD Project by 20 1.1 fvdl * Wasabi Systems, Inc. 21 1.1 fvdl * 4. The name of Wasabi Systems, Inc. may not be used to endorse 22 1.1 fvdl * or promote products derived from this software without specific prior 23 1.1 fvdl * written permission. 24 1.1 fvdl * 25 1.1 fvdl * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 26 1.1 fvdl * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27 1.1 fvdl * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28 1.1 fvdl * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 29 1.1 fvdl * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 1.1 fvdl * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 1.1 fvdl * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 1.1 fvdl * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 1.1 fvdl * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 1.1 fvdl * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 1.1 fvdl * POSSIBILITY OF SUCH DAMAGE. 36 1.1 fvdl */ 37 1.1 fvdl 38 1.1 fvdl #include <machine/asm.h> 39 1.1 fvdl 40 1.1 fvdl #if defined(LIBC_SCCS) && !defined(lint) 41 1.1 fvdl RCSID("$NetBSD: swapcontext.S,v 1.1 2003/01/30 02:07:31 fvdl Exp $") 42 1.1 fvdl #endif /* LIBC_SCCS && !lint */ 43 1.1 fvdl 44 1.1 fvdl /* 45 1.1 fvdl * 56 == offsetof(ucontext_t, uc_mcontext) 46 1.1 fvdl * 21 == _REG_RIP 47 1.1 fvdl * 24 == _REG_URSP 48 1.1 fvdl */ 49 1.1 fvdl 50 1.1 fvdl ENTRY(swapcontext) 51 1.1 fvdl pushq %r12 52 1.1 fvdl pushq %r13 53 1.1 fvdl movq %rdi,%r12 /* preserve oucp */ 54 1.1 fvdl movq %rsi,%r13 /* preserve ucp */ 55 1.1 fvdl #ifdef PIC 56 1.1 fvdl call PIC_PLT(_C_LABEL(getcontext)) 57 1.1 fvdl #else 58 1.1 fvdl call _C_LABEL(getcontext) 59 1.1 fvdl #endif 60 1.1 fvdl testl %eax,%eax 61 1.1 fvdl jnz 2f 62 1.1 fvdl movq (%rsp),%r11 63 1.1 fvdl movq %r11,(56 + 21 * 8)(%r12) 64 1.1 fvdl leaq 8(%rsp),%r11 65 1.1 fvdl movq %r11,(56 + 24 * 8)(%r12) 66 1.1 fvdl movq %r13,%rdi 67 1.1 fvdl #ifdef PIC 68 1.1 fvdl call PIC_PLT(_C_LABEL(setcontext)) 69 1.1 fvdl #else 70 1.1 fvdl call _C_LABEL(setcontext) 71 1.1 fvdl #endif 72 1.1 fvdl 2: 73 1.1 fvdl popq %r13 74 1.1 fvdl popq %r12 75 1.1 fvdl ret 76
Indexes created Wed Oct 01 13:09:50 GMT 2025