1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 /* 30 * Block comment which describes the contents of this file. 31 */ 32 33 #include <_synonyms.h> 34 #include <string.h> 35 #include <dlfcn.h> 36 #include <debug.h> 37 #include <_rtld.h> 38 #include <_elf.h> 39 #include <msg.h> 40 41 #include <stdio.h> 42 43 static Dl_amd64_unwindinfo * 44 getunwind_core(Rt_map *lmp, void *pc, Dl_amd64_unwindinfo *unwindinfo) 45 { 46 /* 47 * Validate the version information. 48 */ 49 if (unwindinfo == NULL) { 50 eprintf(LIST(lmp), ERR_FATAL, MSG_INTL(MSG_ARG_ILLVAL)); 51 return (0); 52 } 53 if ((unwindinfo->dlui_version < DLUI_VERS_1) || 54 (unwindinfo->dlui_version > DLUI_VERS_CURRENT)) { 55 eprintf(LIST(lmp), ERR_FATAL, MSG_INTL(MSG_UNW_BADVERS), 56 DLUI_VERS_CURRENT, unwindinfo->dlui_version); 57 return (0); 58 } 59 60 /* 61 * Clean out the structure. 62 */ 63 unwindinfo->dlui_flags = 0; 64 unwindinfo->dlui_objname = 0; 65 unwindinfo->dlui_unwindstart = 0; 66 unwindinfo->dlui_unwindend = 0; 67 unwindinfo->dlui_segstart = 0; 68 unwindinfo->dlui_segend = 0; 69 70 if (lmp) { 71 Mmap *immap; 72 73 unwindinfo->dlui_objname = PATHNAME(lmp); 74 75 /* 76 * Scan through the mmaps of this object to get the specific 77 * segment found. 78 */ 79 for (immap = MMAPS(lmp); immap->m_vaddr; immap++) { 80 if (((caddr_t)pc >= immap->m_vaddr) && 81 ((caddr_t)pc < (immap->m_vaddr + immap->m_msize))) { 82 break; 83 } 84 } 85 unwindinfo->dlui_segstart = immap->m_vaddr; 86 unwindinfo->dlui_segend = immap->m_vaddr + immap->m_msize; 87 88 if (PTUNWIND(lmp) && (immap->m_vaddr)) { 89 uintptr_t base; 90 91 if (FLAGS(lmp) & FLG_RT_FIXED) 92 base = 0; 93 else 94 base = ADDR(lmp); 95 96 unwindinfo->dlui_unwindstart = 97 (void *)(PTUNWIND(lmp)->p_vaddr + base); 98 unwindinfo->dlui_unwindend = 99 (void *)(PTUNWIND(lmp)->p_vaddr + 100 PTUNWIND(lmp)->p_memsz + base); 101 102 } else if (immap->m_vaddr) 103 unwindinfo->dlui_flags |= DLUI_FLG_NOUNWIND; 104 else 105 unwindinfo->dlui_flags |= 106 DLUI_FLG_NOUNWIND | DLUI_FLG_NOOBJ; 107 } else { 108 /* 109 * No object found. 110 */ 111 unwindinfo->dlui_flags = DLUI_FLG_NOOBJ | DLUI_FLG_NOUNWIND; 112 } 113 return (unwindinfo); 114 } 115 116 #pragma weak dlamd64getunwind = _dlamd64getunwind 117 118 Dl_amd64_unwindinfo * 119 _dlamd64getunwind(void *pc, Dl_amd64_unwindinfo *unwindinfo) 120 { 121 Rt_map *lmp; 122 int entry = enter(); 123 124 /* 125 * Identify the link-map associated with the exception "pc". Note, 126 * this is not the actual caller of _dlamd64getunwind(), which is 127 * probably one of the libC libraries. However, the caller and 128 * exception object are both on the same link-map list. 129 */ 130 lmp = _caller(pc, CL_NONE); 131 132 unwindinfo = getunwind_core(lmp, pc, unwindinfo); 133 134 if (entry) 135 leave(LIST(lmp)); 136 return (unwindinfo); 137 } 138