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, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22/* 23 * Copyright 2004 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#include <SYS.h> 32 33/* Cancellation/thr_exit() stuff */ 34 35/* 36 * _ex_unwind_local(void) 37 * 38 * Called only from _t_cancel(). 39 * Unwind two frames and invoke _t_cancel(fp) again. 40 * 41 * Before this the call stack is: f4 f3 f2 f1 _t_cancel 42 * After this the call stack is: f4 f3 f2 _t_cancel 43 * (as if "call f1" is replaced by "call _t_cancel(fp)" in f2) 44 */ 45 46 ENTRY(_ex_unwind_local) 47 movl (%ebp), %edx / pop first frame [ back to f1() ] 48 movl (%edx), %ebp / pop second frame [ back to f2() ] 49 movl 4(%edx), %eax / save f2's return pc 50 movl %eax, (%edx) / mov it up for one arg 51 movl %edx, %esp / stack pointer at ret addr 52 movl %ebp, 4(%esp) 53 jmp _t_cancel 54 SET_SIZE(_ex_unwind_local) 55 56/* 57 * _ex_clnup_handler(void *arg, void (*clnup)(void *)) 58 * 59 * Called only from _t_cancel(). 60 * Unwind one frame, call the cleanup handler with argument arg from the 61 * restored frame, then jump to _t_cancel(fp) again from the restored frame. 62 */ 63 64 ENTRY(_ex_clnup_handler) 65 pushl %ebp / save current frame pointer 66 pushl 8(%esp) / first argument [arg] 67 movl (%ebp), %ebp / pop out one frame 68 call *16(%esp) / call handler [clnup] 69 addl $4, %esp 70 popl %eax / old frame pointer 71 lea 4(%eax), %esp / stk points to old frame 72 movl %ebp, 4(%esp) / _t_cancel() gets frame pointer arg 73 jmp _t_cancel 74 SET_SIZE(_ex_clnup_handler) 75 76/* 77 * _thrp_unwind(void *arg) 78 * 79 * Ignore the argument; jump to _t_cancel(fp) with caller's fp 80 */ 81 ENTRY(_thrp_unwind) 82 movl %ebp, 4(%esp) 83 jmp _t_cancel 84 SET_SIZE(_thrp_unwind) 85