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#include <../assym.h> 30*5d9d9091SRichard Lowe 31*5d9d9091SRichard Lowe/* Cancellation/thr_exit() stuff */ 32*5d9d9091SRichard Lowe 33*5d9d9091SRichard Lowe/* 34*5d9d9091SRichard Lowe * _ex_unwind_local(void) 35*5d9d9091SRichard Lowe * 36*5d9d9091SRichard Lowe * Called only from _t_cancel(). 37*5d9d9091SRichard Lowe * Unwind two frames and invoke _t_cancel(fp) again. 38*5d9d9091SRichard Lowe * 39*5d9d9091SRichard Lowe * Before this the call stack is: f4 f3 f2 f1 _t_cancel 40*5d9d9091SRichard Lowe * After this the call stack is: f4 f3 f2 _t_cancel 41*5d9d9091SRichard Lowe * (as if "call f1" is replaced by "call _t_cancel(fp)" in f2) 42*5d9d9091SRichard Lowe */ 43*5d9d9091SRichard Lowe ENTRY(_ex_unwind_local) 44*5d9d9091SRichard Lowe restore 45*5d9d9091SRichard Lowe restore 46*5d9d9091SRichard Lowe ba _t_cancel ! tailcall _t_cancel(fp) 47*5d9d9091SRichard Lowe mov %fp, %o0 ! passing the frame pointer 48*5d9d9091SRichard Lowe SET_SIZE(_ex_unwind_local) 49*5d9d9091SRichard Lowe 50*5d9d9091SRichard Lowe/* 51*5d9d9091SRichard Lowe * _ex_clnup_handler(void *arg, void (*clnup)(void *)) 52*5d9d9091SRichard Lowe * 53*5d9d9091SRichard Lowe * Called only from _t_cancel(). 54*5d9d9091SRichard Lowe * Unwind one frame, call the cleanup handler with argument arg from the 55*5d9d9091SRichard Lowe * restored frame, then jump to _t_cancel(fp) again from the restored frame. 56*5d9d9091SRichard Lowe */ 57*5d9d9091SRichard Lowe ENTRY(_ex_clnup_handler) 58*5d9d9091SRichard Lowe mov %o1, %i1 ! handler address -> %o1 after restore 59*5d9d9091SRichard Lowe restore %o0, %g0, %o0 ! handler arg -> %o0 after restore 60*5d9d9091SRichard Lowe stn %o7, [%g7 + UL_UNWIND_RET] ! save caller's return address 61*5d9d9091SRichard Lowe jmpl %o1, %o7 ! invoke func with arg 62*5d9d9091SRichard Lowe nop ! and return here 63*5d9d9091SRichard Lowe ldn [%g7 + UL_UNWIND_RET], %o7 ! restore return address 64*5d9d9091SRichard Lowe ba _t_cancel ! tailcall _t_cancel(fp) 65*5d9d9091SRichard Lowe mov %fp, %o0 ! passing the frame pointer 66*5d9d9091SRichard Lowe SET_SIZE(_ex_clnup_handler) 67*5d9d9091SRichard Lowe 68*5d9d9091SRichard Lowe/* 69*5d9d9091SRichard Lowe * _thrp_unwind(void *arg) 70*5d9d9091SRichard Lowe * 71*5d9d9091SRichard Lowe * Ignore the argument; jump to _t_cancel(fp) with caller's fp 72*5d9d9091SRichard Lowe */ 73*5d9d9091SRichard Lowe ENTRY(_thrp_unwind) 74*5d9d9091SRichard Lowe ba _t_cancel ! tailcall _t_cancel(fp) 75*5d9d9091SRichard Lowe mov %fp, %o0 ! passing the frame pointer 76*5d9d9091SRichard Lowe SET_SIZE(_thrp_unwind) 77