1*8269e767SBrooks Davis/*- 2*8269e767SBrooks Davis * Copyright (c) 2003 Peter Wemm <peter@FreeBSD.org> 3*8269e767SBrooks Davis * All rights reserved. 4*8269e767SBrooks Davis * 5*8269e767SBrooks Davis * Redistribution and use in source and binary forms, with or without 6*8269e767SBrooks Davis * modification, are permitted provided that the following conditions 7*8269e767SBrooks Davis * are met: 8*8269e767SBrooks Davis * 1. Redistributions of source code must retain the above copyright 9*8269e767SBrooks Davis * notice, this list of conditions and the following disclaimer. 10*8269e767SBrooks Davis * 2. Redistributions in binary form must reproduce the above copyright 11*8269e767SBrooks Davis * notice, this list of conditions and the following disclaimer in the 12*8269e767SBrooks Davis * documentation and/or other materials provided with the distribution. 13*8269e767SBrooks Davis * 14*8269e767SBrooks Davis * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15*8269e767SBrooks Davis * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16*8269e767SBrooks Davis * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17*8269e767SBrooks Davis * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18*8269e767SBrooks Davis * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19*8269e767SBrooks Davis * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20*8269e767SBrooks Davis * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21*8269e767SBrooks Davis * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22*8269e767SBrooks Davis * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23*8269e767SBrooks Davis * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24*8269e767SBrooks Davis * SUCH DAMAGE. 25*8269e767SBrooks Davis */ 26*8269e767SBrooks Davis 27*8269e767SBrooks Davis#include <machine/asm.h> 28*8269e767SBrooks Davis#include <SYS.h> 29*8269e767SBrooks Davis 30*8269e767SBrooks Davis/* 31*8269e767SBrooks Davis * This has to be magic to handle the multiple returns. 32*8269e767SBrooks Davis * Otherwise, the setcontext() syscall will return here and we'll 33*8269e767SBrooks Davis * pop off the return address and go to the *setcontext* call. 34*8269e767SBrooks Davis */ 35*8269e767SBrooks Davis WEAK_REFERENCE(__sys_getcontext, _getcontext) 36*8269e767SBrooks Davis WEAK_REFERENCE(__sys_getcontext, getcontext) 37*8269e767SBrooks DavisENTRY(__sys_getcontext) 38*8269e767SBrooks Davis movq (%rsp),%rsi /* save getcontext return address */ 39*8269e767SBrooks Davis _SYSCALL(getcontext) 40*8269e767SBrooks Davis jb HIDENAME(cerror) 41*8269e767SBrooks Davis addq $8,%rsp /* remove stale (setcontext) return address */ 42*8269e767SBrooks Davis jmp *%rsi /* restore return address */ 43*8269e767SBrooks DavisEND(__sys_getcontext) 44*8269e767SBrooks Davis 45*8269e767SBrooks Davis .section .note.GNU-stack,"",%progbits 46