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 2007 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(Lm_list *lml, Rt_map *lmp, void *pc, 45 Dl_amd64_unwindinfo *unwindinfo) 46 { 47 /* 48 * Validate the version information. 49 */ 50 if (unwindinfo == NULL) { 51 eprintf(lml, ERR_FATAL, MSG_INTL(MSG_ARG_ILLVAL)); 52 return (0); 53 } 54 if ((unwindinfo->dlui_version < DLUI_VERS_1) || 55 (unwindinfo->dlui_version > DLUI_VERS_CURRENT)) { 56 eprintf(lml, ERR_FATAL, MSG_INTL(MSG_UNW_BADVERS), 57 unwindinfo->dlui_version, DLUI_VERS_CURRENT); 58 return (0); 59 } 60 61 /* 62 * Clean out the structure. 63 */ 64 unwindinfo->dlui_flags = 0; 65 unwindinfo->dlui_objname = 0; 66 unwindinfo->dlui_unwindstart = 0; 67 unwindinfo->dlui_unwindend = 0; 68 unwindinfo->dlui_segstart = 0; 69 unwindinfo->dlui_segend = 0; 70 71 if (lmp) { 72 Mmap *immap; 73 74 unwindinfo->dlui_objname = PATHNAME(lmp); 75 76 /* 77 * Scan through the mmaps of this object to get the specific 78 * segment found. 79 */ 80 for (immap = MMAPS(lmp); immap->m_vaddr; immap++) { 81 if (((caddr_t)pc >= immap->m_vaddr) && 82 ((caddr_t)pc < (immap->m_vaddr + immap->m_msize))) { 83 break; 84 } 85 } 86 unwindinfo->dlui_segstart = immap->m_vaddr; 87 unwindinfo->dlui_segend = immap->m_vaddr + immap->m_msize; 88 89 if (PTUNWIND(lmp) && (immap->m_vaddr)) { 90 uintptr_t base; 91 92 if (FLAGS(lmp) & FLG_RT_FIXED) 93 base = 0; 94 else 95 base = ADDR(lmp); 96 97 unwindinfo->dlui_unwindstart = 98 (void *)(PTUNWIND(lmp)->p_vaddr + base); 99 unwindinfo->dlui_unwindend = 100 (void *)(PTUNWIND(lmp)->p_vaddr + 101 PTUNWIND(lmp)->p_memsz + base); 102 103 } else if (immap->m_vaddr) 104 unwindinfo->dlui_flags |= DLUI_FLG_NOUNWIND; 105 else 106 unwindinfo->dlui_flags |= 107 DLUI_FLG_NOUNWIND | DLUI_FLG_NOOBJ; 108 } else { 109 /* 110 * No object found. 111 */ 112 unwindinfo->dlui_flags = DLUI_FLG_NOOBJ | DLUI_FLG_NOUNWIND; 113 } 114 return (unwindinfo); 115 } 116 117 #pragma weak dlamd64getunwind = _dlamd64getunwind 118 119 Dl_amd64_unwindinfo * 120 _dlamd64getunwind(void *pc, Dl_amd64_unwindinfo *unwindinfo) 121 { 122 Rt_map *lmp; 123 Lm_list *lml; 124 int entry = enter(); 125 126 /* 127 * Identify the link-map associated with the exception "pc". Note, 128 * this is not the actual caller of _dlamd64getunwind(), which is 129 * probably one of the libC libraries. However, the caller and 130 * exception object are both on the same link-map list. In doing this, 131 * we must guard against being given a pc that does not correspond to a 132 * link-map (as can happen with a pc fabricated by a debugger such as 133 * dbx). In this case, getunwind_core() will fill the unwind data 134 * buffer with flags set to indicate an unknown caller. 135 */ 136 if ((lmp = _caller(pc, CL_NONE)) != 0) 137 lml = LIST(lmp); 138 else 139 lml = 0; 140 141 unwindinfo = getunwind_core(lml, lmp, pc, unwindinfo); 142 143 if (entry) 144 leave(lml); 145 return (unwindinfo); 146 } 147