17c478bd9Sstevel@tonic-gate/* 27c478bd9Sstevel@tonic-gate * CDDL HEADER START 37c478bd9Sstevel@tonic-gate * 47c478bd9Sstevel@tonic-gate * The contents of this file are subject to the terms of the 5*9a70fc3bSMark J. Nelson * Common Development and Distribution License (the "License"). 6*9a70fc3bSMark J. Nelson * You may not use this file except in compliance with the License. 77c478bd9Sstevel@tonic-gate * 87c478bd9Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 97c478bd9Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 107c478bd9Sstevel@tonic-gate * See the License for the specific language governing permissions 117c478bd9Sstevel@tonic-gate * and limitations under the License. 127c478bd9Sstevel@tonic-gate * 137c478bd9Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 147c478bd9Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 157c478bd9Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 167c478bd9Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 177c478bd9Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 187c478bd9Sstevel@tonic-gate * 197c478bd9Sstevel@tonic-gate * CDDL HEADER END 207c478bd9Sstevel@tonic-gate */ 217c478bd9Sstevel@tonic-gate/* 227c478bd9Sstevel@tonic-gate * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 237c478bd9Sstevel@tonic-gate * Use is subject to license terms. 247c478bd9Sstevel@tonic-gate */ 257c478bd9Sstevel@tonic-gate 26*9a70fc3bSMark J. Nelson .file "unwind_frame.s" 277c478bd9Sstevel@tonic-gate 287c478bd9Sstevel@tonic-gate#include <SYS.h> 297c478bd9Sstevel@tonic-gate 307c478bd9Sstevel@tonic-gate/* Cancellation/thr_exit() stuff */ 317c478bd9Sstevel@tonic-gate 327c478bd9Sstevel@tonic-gate/* 337c478bd9Sstevel@tonic-gate * _ex_unwind_local(void) 347c478bd9Sstevel@tonic-gate * 357c478bd9Sstevel@tonic-gate * Called only from _t_cancel(). 367c478bd9Sstevel@tonic-gate * Unwind two frames and invoke _t_cancel(fp) again. 377c478bd9Sstevel@tonic-gate * 387c478bd9Sstevel@tonic-gate * Before this the call stack is: f4 f3 f2 f1 _t_cancel 397c478bd9Sstevel@tonic-gate * After this the call stack is: f4 f3 f2 _t_cancel 407c478bd9Sstevel@tonic-gate * (as if "call f1" is replaced by "call _t_cancel(fp)" in f2) 417c478bd9Sstevel@tonic-gate */ 427c478bd9Sstevel@tonic-gate 437c478bd9Sstevel@tonic-gate ENTRY(_ex_unwind_local) 447c478bd9Sstevel@tonic-gate movl (%ebp), %edx / pop first frame [ back to f1() ] 457c478bd9Sstevel@tonic-gate movl (%edx), %ebp / pop second frame [ back to f2() ] 467c478bd9Sstevel@tonic-gate movl 4(%edx), %eax / save f2's return pc 477c478bd9Sstevel@tonic-gate movl %eax, (%edx) / mov it up for one arg 487c478bd9Sstevel@tonic-gate movl %edx, %esp / stack pointer at ret addr 497c478bd9Sstevel@tonic-gate movl %ebp, 4(%esp) 507c478bd9Sstevel@tonic-gate jmp _t_cancel 517c478bd9Sstevel@tonic-gate SET_SIZE(_ex_unwind_local) 527c478bd9Sstevel@tonic-gate 537c478bd9Sstevel@tonic-gate/* 547c478bd9Sstevel@tonic-gate * _ex_clnup_handler(void *arg, void (*clnup)(void *)) 557c478bd9Sstevel@tonic-gate * 567c478bd9Sstevel@tonic-gate * Called only from _t_cancel(). 577c478bd9Sstevel@tonic-gate * Unwind one frame, call the cleanup handler with argument arg from the 587c478bd9Sstevel@tonic-gate * restored frame, then jump to _t_cancel(fp) again from the restored frame. 597c478bd9Sstevel@tonic-gate */ 607c478bd9Sstevel@tonic-gate 617c478bd9Sstevel@tonic-gate ENTRY(_ex_clnup_handler) 627c478bd9Sstevel@tonic-gate pushl %ebp / save current frame pointer 637c478bd9Sstevel@tonic-gate pushl 8(%esp) / first argument [arg] 647c478bd9Sstevel@tonic-gate movl (%ebp), %ebp / pop out one frame 657c478bd9Sstevel@tonic-gate call *16(%esp) / call handler [clnup] 667c478bd9Sstevel@tonic-gate addl $4, %esp 677c478bd9Sstevel@tonic-gate popl %eax / old frame pointer 687c478bd9Sstevel@tonic-gate lea 4(%eax), %esp / stk points to old frame 697c478bd9Sstevel@tonic-gate movl %ebp, 4(%esp) / _t_cancel() gets frame pointer arg 707c478bd9Sstevel@tonic-gate jmp _t_cancel 717c478bd9Sstevel@tonic-gate SET_SIZE(_ex_clnup_handler) 727c478bd9Sstevel@tonic-gate 737c478bd9Sstevel@tonic-gate/* 747c478bd9Sstevel@tonic-gate * _thrp_unwind(void *arg) 757c478bd9Sstevel@tonic-gate * 767c478bd9Sstevel@tonic-gate * Ignore the argument; jump to _t_cancel(fp) with caller's fp 777c478bd9Sstevel@tonic-gate */ 787c478bd9Sstevel@tonic-gate ENTRY(_thrp_unwind) 797c478bd9Sstevel@tonic-gate movl %ebp, 4(%esp) 807c478bd9Sstevel@tonic-gate jmp _t_cancel 817c478bd9Sstevel@tonic-gate SET_SIZE(_thrp_unwind) 82