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, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* Copyright (c) 1988 AT&T */ 23 /* All Rights Reserved */ 24 25 26 /* 27 * Copyright (c) 1998 by Sun Microsystems, Inc. 28 * All rights reserved. 29 */ 30 31 #pragma ident "%Z%%M% %I% %E% SMI" /* SVr4.0 1.13 */ 32 33 #include "libelf.h" 34 #include <unistd.h> 35 #include <fcntl.h> 36 #include <string.h> 37 #include <nlist.h> 38 #include <note.h> 39 #include "syms.h" 40 #include "gelf.h" 41 42 #undef n_name /* This undef is to handle a #define in syms.h */ 43 /* which conflicts with the member nlist->n_name */ 44 /* as defined in nlist.h */ 45 46 47 #define SPACE 100 /* number of symbols read at a time */ 48 #define ISELF (strncmp(magic_buf, ELFMAG, SELFMAG) == 0) 49 50 51 int 52 end_elf_job(int fd, Elf * elfdes) 53 { 54 (void) elf_end(elfdes); 55 (void) close(fd); 56 return (-1); 57 } 58 59 60 int 61 _elf_nlist(int fd, struct nlist * list) 62 { 63 Elf *elfdes; /* ELF descriptor */ 64 GElf_Ehdr ehdr; /* ELF Ehdr */ 65 GElf_Shdr s_buf; /* buffer storing section header */ 66 Elf_Data *symdata; /* buffer points to symbol table */ 67 Elf_Scn *secidx = 0; /* index of the section header table */ 68 GElf_Sym sym; /* buffer storing one symbol information */ 69 unsigned strtab; /* index of symbol name in string table */ 70 long count; /* number of symbols */ 71 long ii; /* loop control */ 72 73 if (elf_version(EV_CURRENT) == EV_NONE) { 74 (void) close(fd); 75 return (-1); 76 } 77 elfdes = elf_begin(fd, ELF_C_READ, (Elf *)0); 78 if (gelf_getehdr(elfdes, &ehdr) == 0) 79 return (end_elf_job(fd, elfdes)); 80 81 while ((secidx = elf_nextscn(elfdes, secidx)) != 0) { 82 if ((gelf_getshdr(secidx, &s_buf)) == 0) 83 return (end_elf_job(fd, elfdes)); 84 if (s_buf.sh_type != SHT_SYMTAB) /* not symbol table */ 85 continue; 86 symdata = elf_getdata(secidx, (Elf_Data *)0); 87 if (symdata == 0) 88 return (end_elf_job(fd, elfdes)); 89 if (symdata->d_size == 0) 90 break; 91 strtab = s_buf.sh_link; 92 count = symdata->d_size / s_buf.sh_entsize; 93 for (ii = 1; ii < count; ++ii) { 94 struct nlist *p; 95 register char *name; 96 /* LINTED */ 97 (void) gelf_getsym(symdata, (int)ii, &sym); 98 name = elf_strptr(elfdes, strtab, (size_t)sym.st_name); 99 if (name == 0) 100 continue; 101 for (p = list; p->n_name && p->n_name[0]; ++p) { 102 if (strcmp(p->n_name, name)) 103 continue; 104 p->n_value = (long)sym.st_value; 105 p->n_type = GELF_ST_TYPE(sym.st_info); 106 p->n_scnum = sym.st_shndx; 107 break; 108 } 109 } 110 break; 111 /* 112 * Currently there is only one symbol table section 113 * in an object file, but this restriction may be 114 * relaxed in the future. 115 */ 116 } 117 (void) elf_end(elfdes); 118 (void) close(fd); 119 return (0); 120 } 121 122 123 NOTE(SCHEME_PROTECTS_DATA("user provides buffers", nlist)) 124 125 int 126 nlist(const char * name, struct nlist * list) 127 { 128 register struct nlist *p; 129 char magic_buf[EI_NIDENT]; 130 int fd; 131 132 for (p = list; p->n_name && p->n_name[0]; p++) { /* n_name can be ptr */ 133 p->n_type = 0; 134 p->n_value = 0L; 135 p->n_scnum = 0; 136 p->n_sclass = 0; 137 p->n_numaux = 0; 138 } 139 140 if ((fd = open(name, 0)) < 0) 141 return (-1); 142 if (read(fd, magic_buf, EI_NIDENT) == -1) { 143 (void) close(fd); 144 return (-1); 145 } 146 147 if (lseek(fd, 0L, 0) == -1L) { /* rewind to beginning of object file */ 148 (void) close(fd); 149 return (-1); 150 } 151 152 #ifndef _LP64 153 if (ISELF && (magic_buf[EI_CLASS] == ELFCLASS32)) 154 #else 155 if (ISELF) /* 64-bit case handles both Elf32 and Elf64 */ 156 #endif 157 return (_elf_nlist(fd, list)); 158 else { 159 (void) close(fd); 160 return (-1); 161 } 162 } 163