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1 /*
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2 * CDDL HEADER START
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3 *
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4 * The contents of this file are subject to the terms of the
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5 * Common Development and Distribution License (the "License").
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6 * You may not use this file except in compliance with the License.
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7 *
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8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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9 * or http://www.opensolaris.org/os/licensing.
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10 * See the License for the specific language governing permissions
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11 * and limitations under the License.
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12 *
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13 * When distributing Covered Code, include this CDDL HEADER in each
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14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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15 * If applicable, add the following below this CDDL HEADER, with the
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16 * fields enclosed by brackets "[]" replaced with your own identifying
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17 * information: Portions Copyright [yyyy] [name of copyright owner]
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18 *
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19 * CDDL HEADER END
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20 */
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1219
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21
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22 /*
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23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
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24 * Use is subject to license terms.
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25 */
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26
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27 #pragma ident "%Z%%M% %I% %E% SMI"
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28
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29 #include "lint.h"
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30 #include "thr_uberdata.h"
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31 #include <dlfcn.h>
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32
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33 /*
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34 * This is common code for sparc, sparcv9, and i386.
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35 * The amd64 unwind code is vastly different from this.
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36 * Look under the amd64-specific directory structure for details.
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37 */
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38
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39 /*
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40 * _ex_unwind() is provided by libC, but if libC is not loaded we
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41 * need to call a local version of _ex_unwind() which does exactly
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42 * the same thing except for calling C++ destructors.
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43 */
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44 extern void _ex_clnup_handler(void *, void (*)(void *));
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45 extern void _ex_unwind_local(void);
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46 #pragma unknown_control_flow(_ex_clnup_handler)
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47 #pragma unknown_control_flow(_ex_unwind_local)
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48
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49 /*
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50 * _t_cancel(fp):calls cleanup handlers if there are any in
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51 * frame (fp), and calls _ex_unwind() to call
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52 * destructors if libC has been linked.
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53 *
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54 * Control comes here from _thrp_unwind. Logically:
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55 *
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56 * _thrp_unwind: first arg = current fp;
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57 * jump _t_cancel;
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58 *
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59 * We could have called _t_cancel(_getfp) from thr_exit()
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60 * but _ex_unwind() also calls _t_cancel() and it does after
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61 * poping out the two frames. If _ex_unwind() passes the current
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62 * fp, then it will be invalid. For a caller of _thrp_unwind()
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63 * it looks as if it is calling _t_cancel(fp).
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64 *
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65 * _t_cancel will eventually call _thrp_exit().
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66 * It never returns from _t_cancel().
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67 *
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68 */
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69 void
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70 _t_cancel(void *fp)
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71 {
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72 ulwp_t *self = curthread;
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73 __cleanup_t *head;
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74 void (*fptr)(void (*func)(void *), void *arg);
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75
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76 /* Do this once per thread exit, not once per unwind frame */
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77 if (self->ul_ex_unwind == NULL &&
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78 (self->ul_ex_unwind = dlsym(RTLD_PROBE, "_ex_unwind")) == NULL)
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79 self->ul_ex_unwind = (void *)-1;
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80
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81 if (self->ul_ex_unwind == (void *)-1)
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82 fptr = NULL;
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83 else
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84 fptr = (void (*)())self->ul_ex_unwind;
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85
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86 if (fp == NULL) {
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87 _thrp_exit();
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88 thr_panic("_t_cancel(): _thrp_exit() returned");
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89 }
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90
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91 if ((head = self->ul_clnup_hdr) != NULL && fp == head->fp) {
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92 self->ul_clnup_hdr = head->next;
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93 /* execute the cleanup handler */
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94 _ex_clnup_handler(head->arg, head->func);
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95 thr_panic("_t_cancel(): _ex_clnup_handler() returned");
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96 }
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97
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98 if (fptr != NULL && self->ul_unwind) {
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99 /* libC is loaded and thread is canceled, call libC version */
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100 (*fptr)(_thrp_unwind, NULL);
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101 thr_panic("_t_cancel(): _ex_unwind() returned");
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102 } else if (head != NULL) {
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103 /* libC not present, call local version */
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104 _ex_unwind_local();
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105 thr_panic("_t_cancel(): _ex_unwind_local() returned");
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106 } else {
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107 /* libC not present and no cleanup handlers, exit here */
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108 _thrp_exit();
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109 thr_panic("_t_cancel(): _thrp_exit() returned");
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110 }
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111 /* never returns here */
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112 }
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