1/* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22/* 23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27#pragma ident "%Z%%M% %I% %E% SMI" 28 29 .file "%M%" 30 31/* 32 * longjmp(env, val) 33 * will generate a "return(val)" from 34 * the last call to 35 * setjmp(env) 36 * by restoring registers rip rsp rbp rbx r12 r13 r14 r15 from 'env' 37 * and doing a return. 38 */ 39 40/* 41 * entry reg offset 42 * env[0] = %rbx 0 register variables 43 * env[1] = %r12 8 44 * env[2] = %r13 16 45 * env[3] = %r14 24 46 * env[4] = %r15 32 47 * env[5] = %rbp 40 stack frame 48 * env[6] = %rsp 48 49 * env[7] = %rip 56 50 */ 51 52#include <sys/asm_linkage.h> 53 54 ANSI_PRAGMA_WEAK(setjmp,function) 55 ANSI_PRAGMA_WEAK(longjmp,function) 56 57 ENTRY(setjmp) 58 movq %rbx, 0(%rdi) 59 movq %r12, 8(%rdi) 60 movq %r13, 16(%rdi) 61 movq %r14, 24(%rdi) 62 movq %r15, 32(%rdi) 63 movq %rbp, 40(%rdi) 64 popq %rdx /* return address */ 65 movq %rsp, 48(%rdi) 66 movq %rdx, 56(%rdi) 67 xorl %eax, %eax /* return 0 */ 68 jmp *%rdx 69 SET_SIZE(setjmp) 70 71 ENTRY(longjmp) 72 movq 0(%rdi), %rbx 73 movq 8(%rdi), %r12 74 movq 16(%rdi), %r13 75 movq 24(%rdi), %r14 76 movq 32(%rdi), %r15 77 movq 40(%rdi), %rbp 78 movq 48(%rdi), %rsp 79 movl %esi, %eax 80 test %eax, %eax /* if val != 0 */ 81 jnz 1f /* return val */ 82 incl %eax /* else return 1 */ 831: 84 movq 56(%rdi), %rdx /* return to caller of setjmp */ 85 jmp *%rdx 86 SET_SIZE(longjmp) 87