1*5d9d9091SRichard Lowe/* 2*5d9d9091SRichard Lowe * CDDL HEADER START 3*5d9d9091SRichard Lowe * 4*5d9d9091SRichard Lowe * The contents of this file are subject to the terms of the 5*5d9d9091SRichard Lowe * Common Development and Distribution License (the "License"). 6*5d9d9091SRichard Lowe * You may not use this file except in compliance with the License. 7*5d9d9091SRichard Lowe * 8*5d9d9091SRichard Lowe * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9*5d9d9091SRichard Lowe * or http://www.opensolaris.org/os/licensing. 10*5d9d9091SRichard Lowe * See the License for the specific language governing permissions 11*5d9d9091SRichard Lowe * and limitations under the License. 12*5d9d9091SRichard Lowe * 13*5d9d9091SRichard Lowe * When distributing Covered Code, include this CDDL HEADER in each 14*5d9d9091SRichard Lowe * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15*5d9d9091SRichard Lowe * If applicable, add the following below this CDDL HEADER, with the 16*5d9d9091SRichard Lowe * fields enclosed by brackets "[]" replaced with your own identifying 17*5d9d9091SRichard Lowe * information: Portions Copyright [yyyy] [name of copyright owner] 18*5d9d9091SRichard Lowe * 19*5d9d9091SRichard Lowe * CDDL HEADER END 20*5d9d9091SRichard Lowe */ 21*5d9d9091SRichard Lowe/* 22*5d9d9091SRichard Lowe * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 23*5d9d9091SRichard Lowe * Use is subject to license terms. 24*5d9d9091SRichard Lowe */ 25*5d9d9091SRichard Lowe 26*5d9d9091SRichard Lowe .file "unwind_frame.s" 27*5d9d9091SRichard Lowe 28*5d9d9091SRichard Lowe#include <SYS.h> 29*5d9d9091SRichard Lowe 30*5d9d9091SRichard Lowe/* Cancellation/thr_exit() stuff */ 31*5d9d9091SRichard Lowe 32*5d9d9091SRichard Lowe/* 33*5d9d9091SRichard Lowe * _ex_unwind_local(void) 34*5d9d9091SRichard Lowe * 35*5d9d9091SRichard Lowe * Called only from _t_cancel(). 36*5d9d9091SRichard Lowe * Unwind two frames and invoke _t_cancel(fp) again. 37*5d9d9091SRichard Lowe * 38*5d9d9091SRichard Lowe * Before this the call stack is: f4 f3 f2 f1 _t_cancel 39*5d9d9091SRichard Lowe * After this the call stack is: f4 f3 f2 _t_cancel 40*5d9d9091SRichard Lowe * (as if "call f1" is replaced by "call _t_cancel(fp)" in f2) 41*5d9d9091SRichard Lowe */ 42*5d9d9091SRichard Lowe 43*5d9d9091SRichard Lowe ENTRY(_ex_unwind_local) 44*5d9d9091SRichard Lowe movl (%ebp), %edx / pop first frame [ back to f1() ] 45*5d9d9091SRichard Lowe movl (%edx), %ebp / pop second frame [ back to f2() ] 46*5d9d9091SRichard Lowe movl 4(%edx), %eax / save f2's return pc 47*5d9d9091SRichard Lowe movl %eax, (%edx) / mov it up for one arg 48*5d9d9091SRichard Lowe movl %edx, %esp / stack pointer at ret addr 49*5d9d9091SRichard Lowe movl %ebp, 4(%esp) 50*5d9d9091SRichard Lowe jmp _t_cancel 51*5d9d9091SRichard Lowe SET_SIZE(_ex_unwind_local) 52*5d9d9091SRichard Lowe 53*5d9d9091SRichard Lowe/* 54*5d9d9091SRichard Lowe * _ex_clnup_handler(void *arg, void (*clnup)(void *)) 55*5d9d9091SRichard Lowe * 56*5d9d9091SRichard Lowe * Called only from _t_cancel(). 57*5d9d9091SRichard Lowe * Unwind one frame, call the cleanup handler with argument arg from the 58*5d9d9091SRichard Lowe * restored frame, then jump to _t_cancel(fp) again from the restored frame. 59*5d9d9091SRichard Lowe */ 60*5d9d9091SRichard Lowe 61*5d9d9091SRichard Lowe ENTRY(_ex_clnup_handler) 62*5d9d9091SRichard Lowe pushl %ebp / save current frame pointer 63*5d9d9091SRichard Lowe pushl 8(%esp) / first argument [arg] 64*5d9d9091SRichard Lowe movl (%ebp), %ebp / pop out one frame 65*5d9d9091SRichard Lowe call *16(%esp) / call handler [clnup] 66*5d9d9091SRichard Lowe addl $4, %esp 67*5d9d9091SRichard Lowe popl %eax / old frame pointer 68*5d9d9091SRichard Lowe lea 4(%eax), %esp / stk points to old frame 69*5d9d9091SRichard Lowe movl %ebp, 4(%esp) / _t_cancel() gets frame pointer arg 70*5d9d9091SRichard Lowe jmp _t_cancel 71*5d9d9091SRichard Lowe SET_SIZE(_ex_clnup_handler) 72*5d9d9091SRichard Lowe 73*5d9d9091SRichard Lowe/* 74*5d9d9091SRichard Lowe * _thrp_unwind(void *arg) 75*5d9d9091SRichard Lowe * 76*5d9d9091SRichard Lowe * Ignore the argument; jump to _t_cancel(fp) with caller's fp 77*5d9d9091SRichard Lowe */ 78*5d9d9091SRichard Lowe ENTRY(_thrp_unwind) 79*5d9d9091SRichard Lowe movl %ebp, 4(%esp) 80*5d9d9091SRichard Lowe jmp _t_cancel 81*5d9d9091SRichard Lowe SET_SIZE(_thrp_unwind) 82