10Sstevel@tonic-gate /* 20Sstevel@tonic-gate * CDDL HEADER START 30Sstevel@tonic-gate * 40Sstevel@tonic-gate * The contents of this file are subject to the terms of the 50Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only 60Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance 70Sstevel@tonic-gate * with the License. 80Sstevel@tonic-gate * 90Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 100Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 110Sstevel@tonic-gate * See the License for the specific language governing permissions 120Sstevel@tonic-gate * and limitations under the License. 130Sstevel@tonic-gate * 140Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 150Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 160Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 170Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 180Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 190Sstevel@tonic-gate * 200Sstevel@tonic-gate * CDDL HEADER END 210Sstevel@tonic-gate */ 22*1219Sraf 230Sstevel@tonic-gate /* 24*1219Sraf * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 250Sstevel@tonic-gate * Use is subject to license terms. 260Sstevel@tonic-gate */ 270Sstevel@tonic-gate 280Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 290Sstevel@tonic-gate 30*1219Sraf #include "synonyms.h" 310Sstevel@tonic-gate #include "thr_uberdata.h" 320Sstevel@tonic-gate #include <dlfcn.h> 330Sstevel@tonic-gate 340Sstevel@tonic-gate /* 350Sstevel@tonic-gate * This is common code for sparc, sparcv9, and i386. 360Sstevel@tonic-gate * The amd64 unwind code is vastly different from this. 370Sstevel@tonic-gate * Look under the amd64-specific directory structure for details. 380Sstevel@tonic-gate */ 390Sstevel@tonic-gate 400Sstevel@tonic-gate /* 410Sstevel@tonic-gate * _ex_unwind() is provided by libC, but if libC is not loaded we 420Sstevel@tonic-gate * need to call a local version of _ex_unwind() which does exactly 430Sstevel@tonic-gate * the same thing except for calling C++ destructors. 440Sstevel@tonic-gate */ 450Sstevel@tonic-gate extern void _ex_clnup_handler(void *, void (*)(void *)); 460Sstevel@tonic-gate extern void _ex_unwind_local(void); 470Sstevel@tonic-gate #pragma unknown_control_flow(_ex_clnup_handler) 480Sstevel@tonic-gate #pragma unknown_control_flow(_ex_unwind_local) 490Sstevel@tonic-gate 500Sstevel@tonic-gate /* 510Sstevel@tonic-gate * _t_cancel(fp):calls cleanup handlers if there are any in 520Sstevel@tonic-gate * frame (fp), and calls _ex_unwind() to call 530Sstevel@tonic-gate * destructors if libC has been linked. 540Sstevel@tonic-gate * 550Sstevel@tonic-gate * Control comes here from _thrp_unwind. Logically: 560Sstevel@tonic-gate * 570Sstevel@tonic-gate * _thrp_unwind: first arg = current fp; 580Sstevel@tonic-gate * jump _t_cancel; 590Sstevel@tonic-gate * 600Sstevel@tonic-gate * We could have called _t_cancel(_getfp) from _thr_exit() 610Sstevel@tonic-gate * but _ex_unwind() also calls _t_cancel() and it does after 620Sstevel@tonic-gate * poping out the two frames. If _ex_unwind() passes the current 630Sstevel@tonic-gate * fp, then it will be invalid. For a caller of _thrp_unwind() 640Sstevel@tonic-gate * it looks as if it is calling _t_cancel(fp). 650Sstevel@tonic-gate * 660Sstevel@tonic-gate * _t_cancel will eventually call _thrp_exit(). 670Sstevel@tonic-gate * It never returns from _t_cancel(). 680Sstevel@tonic-gate * 690Sstevel@tonic-gate */ 700Sstevel@tonic-gate void 710Sstevel@tonic-gate _t_cancel(void *fp) 720Sstevel@tonic-gate { 730Sstevel@tonic-gate ulwp_t *self = curthread; 740Sstevel@tonic-gate __cleanup_t *head; 750Sstevel@tonic-gate void (*fptr)(void (*func)(void *), void *arg); 760Sstevel@tonic-gate 770Sstevel@tonic-gate /* Do this once per thread exit, not once per unwind frame */ 780Sstevel@tonic-gate if (self->ul_ex_unwind == NULL && 790Sstevel@tonic-gate (self->ul_ex_unwind = dlsym(RTLD_PROBE, "_ex_unwind")) == NULL) 800Sstevel@tonic-gate self->ul_ex_unwind = (void *)-1; 810Sstevel@tonic-gate 820Sstevel@tonic-gate if (self->ul_ex_unwind == (void *)-1) 830Sstevel@tonic-gate fptr = NULL; 840Sstevel@tonic-gate else 850Sstevel@tonic-gate fptr = (void (*)())self->ul_ex_unwind; 860Sstevel@tonic-gate 870Sstevel@tonic-gate if (fp == NULL) { 880Sstevel@tonic-gate _thrp_exit(); 890Sstevel@tonic-gate thr_panic("_t_cancel(): _thrp_exit() returned"); 900Sstevel@tonic-gate } 910Sstevel@tonic-gate 920Sstevel@tonic-gate if ((head = self->ul_clnup_hdr) != NULL && fp == head->fp) { 930Sstevel@tonic-gate self->ul_clnup_hdr = head->next; 940Sstevel@tonic-gate /* execute the cleanup handler */ 950Sstevel@tonic-gate _ex_clnup_handler(head->arg, head->func); 960Sstevel@tonic-gate thr_panic("_t_cancel(): _ex_clnup_handler() returned"); 970Sstevel@tonic-gate } 980Sstevel@tonic-gate 990Sstevel@tonic-gate if (fptr != NULL && self->ul_unwind) { 1000Sstevel@tonic-gate /* libC is loaded and thread is canceled, call libC version */ 1010Sstevel@tonic-gate (*fptr)(_thrp_unwind, NULL); 1020Sstevel@tonic-gate thr_panic("_t_cancel(): _ex_unwind() returned"); 1030Sstevel@tonic-gate } else if (head != NULL) { 1040Sstevel@tonic-gate /* libC not present, call local version */ 1050Sstevel@tonic-gate _ex_unwind_local(); 1060Sstevel@tonic-gate thr_panic("_t_cancel(): _ex_unwind_local() returned"); 1070Sstevel@tonic-gate } else { 1080Sstevel@tonic-gate /* libC not present and no cleanup handlers, exit here */ 1090Sstevel@tonic-gate _thrp_exit(); 1100Sstevel@tonic-gate thr_panic("_t_cancel(): _thrp_exit() returned"); 1110Sstevel@tonic-gate } 1120Sstevel@tonic-gate /* never returns here */ 1130Sstevel@tonic-gate } 114