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 2008 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, void *pc, Dl_amd64_unwindinfo *unwindinfo) 45 { 46 Rt_map *lmp; 47 48 /* 49 * Validate the version information. 50 */ 51 if (unwindinfo == NULL) { 52 eprintf(lml, ERR_FATAL, MSG_INTL(MSG_ARG_ILLVAL)); 53 return (0); 54 } 55 if ((unwindinfo->dlui_version < DLUI_VERS_1) || 56 (unwindinfo->dlui_version > DLUI_VERS_CURRENT)) { 57 eprintf(lml, ERR_FATAL, MSG_INTL(MSG_UNW_BADVERS), 58 unwindinfo->dlui_version, DLUI_VERS_CURRENT); 59 return (0); 60 } 61 62 /* 63 * Clean out the structure. 64 */ 65 unwindinfo->dlui_flags = 0; 66 unwindinfo->dlui_objname = 0; 67 unwindinfo->dlui_unwindstart = 0; 68 unwindinfo->dlui_unwindend = 0; 69 unwindinfo->dlui_segstart = 0; 70 unwindinfo->dlui_segend = 0; 71 72 /* 73 * Identify the link-map associated with the exception "pc". Note, 74 * the "pc" might not correspond to a link-map (as can happen with a 75 * "pc" fabricated by a debugger such as dbx). In this case, the 76 * unwind data buffer will be filled with flags set to indicate an 77 * unknown caller. 78 */ 79 lmp = _caller(pc, CL_NONE); 80 81 if (lmp) { 82 Mmap *immap; 83 84 unwindinfo->dlui_objname = PATHNAME(lmp); 85 86 /* 87 * Scan through the mmaps of this object to get the specific 88 * segment found. 89 */ 90 for (immap = MMAPS(lmp); immap->m_vaddr; immap++) { 91 if (((caddr_t)pc >= immap->m_vaddr) && 92 ((caddr_t)pc < (immap->m_vaddr + immap->m_msize))) { 93 break; 94 } 95 } 96 unwindinfo->dlui_segstart = immap->m_vaddr; 97 unwindinfo->dlui_segend = immap->m_vaddr + immap->m_msize; 98 99 if (PTUNWIND(lmp) && (immap->m_vaddr)) { 100 uintptr_t base; 101 102 if (FLAGS(lmp) & FLG_RT_FIXED) 103 base = 0; 104 else 105 base = ADDR(lmp); 106 107 unwindinfo->dlui_unwindstart = 108 (void *)(PTUNWIND(lmp)->p_vaddr + base); 109 unwindinfo->dlui_unwindend = 110 (void *)(PTUNWIND(lmp)->p_vaddr + 111 PTUNWIND(lmp)->p_memsz + base); 112 113 } else if (immap->m_vaddr) 114 unwindinfo->dlui_flags |= DLUI_FLG_NOUNWIND; 115 else 116 unwindinfo->dlui_flags |= 117 DLUI_FLG_NOUNWIND | DLUI_FLG_NOOBJ; 118 } else { 119 /* 120 * No object found. 121 */ 122 unwindinfo->dlui_flags = DLUI_FLG_NOOBJ | DLUI_FLG_NOUNWIND; 123 } 124 return (unwindinfo); 125 } 126 127 #pragma weak dlamd64getunwind = _dlamd64getunwind 128 129 Dl_amd64_unwindinfo * 130 _dlamd64getunwind(void *pc, Dl_amd64_unwindinfo *unwindinfo) 131 { 132 Rt_map *lmp; 133 Lm_list *lml; 134 int entry = enter(0); 135 136 lmp = _caller(caller(), CL_EXECDEF); 137 lml = LIST(lmp); 138 139 unwindinfo = getunwind_core(lml, pc, unwindinfo); 140 141 if (entry) 142 leave(lml, 0); 143 return (unwindinfo); 144 } 145