1*0Sstevel@tonic-gate /* 2*0Sstevel@tonic-gate * CDDL HEADER START 3*0Sstevel@tonic-gate * 4*0Sstevel@tonic-gate * The contents of this file are subject to the terms of the 5*0Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only 6*0Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance 7*0Sstevel@tonic-gate * with the License. 8*0Sstevel@tonic-gate * 9*0Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10*0Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 11*0Sstevel@tonic-gate * See the License for the specific language governing permissions 12*0Sstevel@tonic-gate * and limitations under the License. 13*0Sstevel@tonic-gate * 14*0Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 15*0Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16*0Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 17*0Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 18*0Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 19*0Sstevel@tonic-gate * 20*0Sstevel@tonic-gate * CDDL HEADER END 21*0Sstevel@tonic-gate */ 22*0Sstevel@tonic-gate /* 23*0Sstevel@tonic-gate * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 24*0Sstevel@tonic-gate * Use is subject to license terms. 25*0Sstevel@tonic-gate */ 26*0Sstevel@tonic-gate 27*0Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 28*0Sstevel@tonic-gate 29*0Sstevel@tonic-gate /* Copyright (c) 1988 AT&T */ 30*0Sstevel@tonic-gate /* All Rights Reserved */ 31*0Sstevel@tonic-gate 32*0Sstevel@tonic-gate 33*0Sstevel@tonic-gate #pragma weak makecontext = _makecontext 34*0Sstevel@tonic-gate 35*0Sstevel@tonic-gate #include "synonyms.h" 36*0Sstevel@tonic-gate #include <stdarg.h> 37*0Sstevel@tonic-gate #include <ucontext.h> 38*0Sstevel@tonic-gate #include <sys/stack.h> 39*0Sstevel@tonic-gate 40*0Sstevel@tonic-gate /* 41*0Sstevel@tonic-gate * The ucontext_t that the user passes in must have been primed with a 42*0Sstevel@tonic-gate * call to getcontext(2), have the uc_stack member set to reflect the 43*0Sstevel@tonic-gate * stack which this context will use, and have the uc_link member set 44*0Sstevel@tonic-gate * to the context which should be resumed when this context returns. 45*0Sstevel@tonic-gate * When makecontext() returns, the ucontext_t will be set to run the 46*0Sstevel@tonic-gate * given function with the given parameters on the stack specified by 47*0Sstevel@tonic-gate * uc_stack, and which will return to the ucontext_t specified by uc_link. 48*0Sstevel@tonic-gate */ 49*0Sstevel@tonic-gate 50*0Sstevel@tonic-gate static void resumecontext(void); 51*0Sstevel@tonic-gate 52*0Sstevel@tonic-gate void 53*0Sstevel@tonic-gate makecontext(ucontext_t *ucp, void (*func)(), int argc, ...) 54*0Sstevel@tonic-gate { 55*0Sstevel@tonic-gate long *sp; 56*0Sstevel@tonic-gate long *tsp; 57*0Sstevel@tonic-gate va_list ap; 58*0Sstevel@tonic-gate size_t size; 59*0Sstevel@tonic-gate 60*0Sstevel@tonic-gate ucp->uc_mcontext.gregs[EIP] = (greg_t)func; 61*0Sstevel@tonic-gate 62*0Sstevel@tonic-gate size = sizeof (long) * (argc + 1); 63*0Sstevel@tonic-gate 64*0Sstevel@tonic-gate sp = (long *)(((uintptr_t)ucp->uc_stack.ss_sp + 65*0Sstevel@tonic-gate ucp->uc_stack.ss_size - size) & ~(STACK_ALIGN - 1)); 66*0Sstevel@tonic-gate 67*0Sstevel@tonic-gate tsp = sp + 1; 68*0Sstevel@tonic-gate 69*0Sstevel@tonic-gate va_start(ap, argc); 70*0Sstevel@tonic-gate 71*0Sstevel@tonic-gate while (argc-- > 0) { 72*0Sstevel@tonic-gate *tsp++ = va_arg(ap, long); 73*0Sstevel@tonic-gate } 74*0Sstevel@tonic-gate 75*0Sstevel@tonic-gate va_end(ap); 76*0Sstevel@tonic-gate 77*0Sstevel@tonic-gate *sp = (long)resumecontext; /* return address */ 78*0Sstevel@tonic-gate 79*0Sstevel@tonic-gate ucp->uc_mcontext.gregs[UESP] = (greg_t)sp; 80*0Sstevel@tonic-gate } 81*0Sstevel@tonic-gate 82*0Sstevel@tonic-gate 83*0Sstevel@tonic-gate static void 84*0Sstevel@tonic-gate resumecontext(void) 85*0Sstevel@tonic-gate { 86*0Sstevel@tonic-gate ucontext_t uc; 87*0Sstevel@tonic-gate 88*0Sstevel@tonic-gate (void) getcontext(&uc); 89*0Sstevel@tonic-gate (void) setcontext(uc.uc_link); 90*0Sstevel@tonic-gate } 91