1*0Sstevel@tonic-gate /* 2*0Sstevel@tonic-gate * CDDL HEADER START 3*0Sstevel@tonic-gate * 4*0Sstevel@tonic-gate * The contents of this file are subject to the terms of the 5*0Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only 6*0Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance 7*0Sstevel@tonic-gate * with the License. 8*0Sstevel@tonic-gate * 9*0Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10*0Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 11*0Sstevel@tonic-gate * See the License for the specific language governing permissions 12*0Sstevel@tonic-gate * and limitations under the License. 13*0Sstevel@tonic-gate * 14*0Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 15*0Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16*0Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 17*0Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 18*0Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 19*0Sstevel@tonic-gate * 20*0Sstevel@tonic-gate * CDDL HEADER END 21*0Sstevel@tonic-gate */ 22*0Sstevel@tonic-gate /* 23*0Sstevel@tonic-gate * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 24*0Sstevel@tonic-gate * Use is subject to license terms. 25*0Sstevel@tonic-gate */ 26*0Sstevel@tonic-gate 27*0Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 28*0Sstevel@tonic-gate 29*0Sstevel@tonic-gate #include "synonyms.h" 30*0Sstevel@tonic-gate #include "thr_uberdata.h" 31*0Sstevel@tonic-gate #include "stack_unwind.h" 32*0Sstevel@tonic-gate #include "reg_num.h" 33*0Sstevel@tonic-gate #include <dlfcn.h> 34*0Sstevel@tonic-gate 35*0Sstevel@tonic-gate /* 36*0Sstevel@tonic-gate * Due to the subtle mysteries of the amd64 unwind interfaces, the 37*0Sstevel@tonic-gate * "Canonical Frame Address" is 16 bytes higher in memory than the 38*0Sstevel@tonic-gate * value of the frame pointer (%fp). 39*0Sstevel@tonic-gate */ 40*0Sstevel@tonic-gate #define CFA_ADJUST 16 41*0Sstevel@tonic-gate 42*0Sstevel@tonic-gate /* ARGSUSED */ 43*0Sstevel@tonic-gate static _Unwind_Reason_Code 44*0Sstevel@tonic-gate posix_stop_func( 45*0Sstevel@tonic-gate int version, 46*0Sstevel@tonic-gate _Unwind_Action _Unwind_actions, 47*0Sstevel@tonic-gate uint64_t exceptionClass, 48*0Sstevel@tonic-gate struct _Unwind_Exception *exceptionObject, 49*0Sstevel@tonic-gate struct _Unwind_Context *context, 50*0Sstevel@tonic-gate void *func_arg) 51*0Sstevel@tonic-gate { 52*0Sstevel@tonic-gate __cleanup_t **headp = (__cleanup_t **)func_arg; 53*0Sstevel@tonic-gate __cleanup_t *head; 54*0Sstevel@tonic-gate uint64_t cfa; 55*0Sstevel@tonic-gate 56*0Sstevel@tonic-gate /* 57*0Sstevel@tonic-gate * If we have reached the origin of the stack, exit now. 58*0Sstevel@tonic-gate */ 59*0Sstevel@tonic-gate cfa = _Unwind_GetCFA(context); 60*0Sstevel@tonic-gate if (cfa == 0 || _Unwind_GetGR(context, RET_ADD) == 0) { 61*0Sstevel@tonic-gate _Unwind_DeleteException(exceptionObject); 62*0Sstevel@tonic-gate _thrp_exit(); 63*0Sstevel@tonic-gate thr_panic("posix_stop_func(): _thrp_exit() returned"); 64*0Sstevel@tonic-gate } 65*0Sstevel@tonic-gate 66*0Sstevel@tonic-gate /* 67*0Sstevel@tonic-gate * Call all Posix cleanup handlers for this frame. 68*0Sstevel@tonic-gate */ 69*0Sstevel@tonic-gate while ((head = *headp) != NULL && 70*0Sstevel@tonic-gate (caddr_t)cfa == head->fp + CFA_ADJUST) { 71*0Sstevel@tonic-gate *headp = head->next; 72*0Sstevel@tonic-gate (*head->func)(head->arg); 73*0Sstevel@tonic-gate } 74*0Sstevel@tonic-gate 75*0Sstevel@tonic-gate return (_URC_NO_REASON); 76*0Sstevel@tonic-gate } 77*0Sstevel@tonic-gate 78*0Sstevel@tonic-gate /* 79*0Sstevel@tonic-gate * _ex_unwind() is provided by libCrun to perform stack unwinding 80*0Sstevel@tonic-gate * and calling C++ destructors as needed, interleaved with calling 81*0Sstevel@tonic-gate * Posix cleanup handlers along the way. If libCrun is not present 82*0Sstevel@tonic-gate * we just need to call the Posix cleanup handlers. 83*0Sstevel@tonic-gate */ 84*0Sstevel@tonic-gate 85*0Sstevel@tonic-gate /* ARGSUSED */ 86*0Sstevel@tonic-gate void 87*0Sstevel@tonic-gate _thrp_unwind(void *dummy) 88*0Sstevel@tonic-gate { 89*0Sstevel@tonic-gate ulwp_t *self = curthread; 90*0Sstevel@tonic-gate __cleanup_t **headp = &self->ul_clnup_hdr; 91*0Sstevel@tonic-gate __cleanup_t *head; 92*0Sstevel@tonic-gate void (*fptr)(_Unwind_Stop_Fn, void *); 93*0Sstevel@tonic-gate 94*0Sstevel@tonic-gate /* Do this once per thread exit, not once per unwind frame */ 95*0Sstevel@tonic-gate if (self->ul_ex_unwind == NULL && 96*0Sstevel@tonic-gate (self->ul_ex_unwind = dlsym(RTLD_PROBE, "_ex_unwind")) == NULL) 97*0Sstevel@tonic-gate self->ul_ex_unwind = (void *)-1; 98*0Sstevel@tonic-gate 99*0Sstevel@tonic-gate if (self->ul_ex_unwind == (void *)-1) 100*0Sstevel@tonic-gate fptr = NULL; 101*0Sstevel@tonic-gate else 102*0Sstevel@tonic-gate fptr = (void (*)())self->ul_ex_unwind; 103*0Sstevel@tonic-gate 104*0Sstevel@tonic-gate /* 105*0Sstevel@tonic-gate * Call _ex_unwind() if it is present (C++ loaded), 106*0Sstevel@tonic-gate * else just call the Posix cleanup handlers. 107*0Sstevel@tonic-gate */ 108*0Sstevel@tonic-gate if (fptr != NULL) 109*0Sstevel@tonic-gate (*fptr)(posix_stop_func, headp); 110*0Sstevel@tonic-gate 111*0Sstevel@tonic-gate /* 112*0Sstevel@tonic-gate * Call all remaining Posix cleanup handlers. 113*0Sstevel@tonic-gate */ 114*0Sstevel@tonic-gate while ((head = *headp) != NULL) { 115*0Sstevel@tonic-gate *headp = head->next; 116*0Sstevel@tonic-gate (*head->func)(head->arg); 117*0Sstevel@tonic-gate } 118*0Sstevel@tonic-gate 119*0Sstevel@tonic-gate _thrp_exit(); 120*0Sstevel@tonic-gate thr_panic("_thrp_unwind(): _thrp_exit() returned"); 121*0Sstevel@tonic-gate } 122