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 2010 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 .file "setjmp.s" 28 29/ longjmp(env, val) 30/ will generate a "return(val)" from 31/ the last call to 32/ setjmp(env) 33/ by restoring registers ip, sp, bp, bx, si, and di from 'env' 34/ and doing a return. 35 36/ entry reg offset from (%si) 37/ env[0] = %ebx 0 / register variables 38/ env[1] = %esi 4 39/ env[2] = %edi 8 40/ env[3] = %ebp 12 / stack frame 41/ env[4] = %esp 16 42/ env[5] = %eip 20 43/ env[6] = jmp flags 24 44 45#include <sys/asm_linkage.h> 46#include <../assym.h> 47 48 ANSI_PRAGMA_WEAK(setjmp,function) 49 ANSI_PRAGMA_WEAK(longjmp,function) 50 51 ENTRY(setjmp) 52 movl 4(%esp),%eax / jmpbuf address 53 movl %ebx,0(%eax) / save ebx 54 movl %esi,4(%eax) / save esi 55 movl %edi,8(%eax) / save edi 56 movl %ebp,12(%eax) / save caller's ebp 57 58 movl %gs:UL_SIGLINK, %ecx 59 xorl %edx, %edx 60 test %ecx, %ecx / are we in a signal handler? 61 jnz 1f 62 inc %edx / no, tell longjmp to clear ul_siglink 631: movl %edx, 24(%eax) / set flag word 64 65 popl %edx / return address 66 movl %esp,16(%eax) / save caller's esp 67 movl %edx,20(%eax) / save caller's return address 68 xorl %eax, %eax / return 0 69 pushl %edx 70 ret 71 SET_SIZE(setjmp) 72 73 ENTRY(longjmp) 74 movl 4(%esp),%edx / first parameter after return addr 75 movl 8(%esp),%eax / second parameter 76 movl 0(%edx),%ebx / restore ebx 77 movl 4(%edx),%esi / restore esi 78 movl 8(%edx),%edi / restore edi 79 movl 12(%edx),%ebp / restore caller's ebp 80 movl 16(%edx),%esp / restore caller's esp 81 82 movl 24(%edx), %ecx 83 test %ecx, %ecx / test flag word 84 jz 1f 85 xorl %ecx, %ecx / if set, clear ul_siglink 86 movl %ecx, %gs:UL_SIGLINK 871: 88 test %eax,%eax / if val != 0 89 jnz 1f / return val 90 incl %eax / else return 1 911: 92 jmp *20(%edx) / return to caller 93 SET_SIZE(longjmp) 94