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 * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 .file "unwind_frame.s" 27 28#include <SYS.h> 29 30/* Cancellation/thr_exit() stuff */ 31 32/* 33 * _ex_unwind_local(void) 34 * 35 * Called only from _t_cancel(). 36 * Unwind two frames and invoke _t_cancel(fp) again. 37 * 38 * Before this the call stack is: f4 f3 f2 f1 _t_cancel 39 * After this the call stack is: f4 f3 f2 _t_cancel 40 * (as if "call f1" is replaced by "call _t_cancel(fp)" in f2) 41 */ 42 43 ENTRY(_ex_unwind_local) 44 movl (%ebp), %edx / pop first frame [ back to f1() ] 45 movl (%edx), %ebp / pop second frame [ back to f2() ] 46 movl 4(%edx), %eax / save f2's return pc 47 movl %eax, (%edx) / mov it up for one arg 48 movl %edx, %esp / stack pointer at ret addr 49 movl %ebp, 4(%esp) 50 jmp _t_cancel 51 SET_SIZE(_ex_unwind_local) 52 53/* 54 * _ex_clnup_handler(void *arg, void (*clnup)(void *)) 55 * 56 * Called only from _t_cancel(). 57 * Unwind one frame, call the cleanup handler with argument arg from the 58 * restored frame, then jump to _t_cancel(fp) again from the restored frame. 59 */ 60 61 ENTRY(_ex_clnup_handler) 62 pushl %ebp / save current frame pointer 63 pushl 8(%esp) / first argument [arg] 64 movl (%ebp), %ebp / pop out one frame 65 call *16(%esp) / call handler [clnup] 66 addl $4, %esp 67 popl %eax / old frame pointer 68 lea 4(%eax), %esp / stk points to old frame 69 movl %ebp, 4(%esp) / _t_cancel() gets frame pointer arg 70 jmp _t_cancel 71 SET_SIZE(_ex_clnup_handler) 72 73/* 74 * _thrp_unwind(void *arg) 75 * 76 * Ignore the argument; jump to _t_cancel(fp) with caller's fp 77 */ 78 ENTRY(_thrp_unwind) 79 movl %ebp, 4(%esp) 80 jmp _t_cancel 81 SET_SIZE(_thrp_unwind) 82