1 /*- 2 * Copyright (c) 1983, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #if 0 31 /* From: */ 32 #ifndef lint 33 static char sccsid[] = "@(#)gprof.c 8.1 (Berkeley) 6/6/93"; 34 #endif /* not lint */ 35 #endif 36 37 #include <sys/cdefs.h> 38 __FBSDID("$FreeBSD$"); 39 40 #include <sys/types.h> 41 #include <sys/mman.h> 42 #include <sys/stat.h> 43 #include <machine/elf.h> 44 45 #include <err.h> 46 #include <fcntl.h> 47 #include <string.h> 48 #include <unistd.h> 49 50 #include "gprof.h" 51 52 static bool wantsym(const Elf_Sym *, const char *); 53 54 /* Things which get -E excluded by default. */ 55 static char *excludes[] = { ".mcount", "_mcleanup", NULL }; 56 57 int 58 elf_getnfile(const char *filename, char ***defaultEs) 59 { 60 int fd; 61 Elf_Ehdr h; 62 struct stat s; 63 void *mapbase; 64 const char *base; 65 const Elf_Shdr *shdrs; 66 const Elf_Shdr *sh_symtab; 67 const Elf_Shdr *sh_strtab; 68 const char *strtab; 69 const Elf_Sym *symtab; 70 int symtabct; 71 int i; 72 73 if ((fd = open(filename, O_RDONLY)) == -1) 74 err(1, "%s", filename); 75 if (read(fd, &h, sizeof h) != sizeof h || !IS_ELF(h)) { 76 close(fd); 77 return -1; 78 } 79 if (fstat(fd, &s) == -1) 80 err(1, "cannot fstat %s", filename); 81 if ((mapbase = mmap(0, s.st_size, PROT_READ, MAP_SHARED, fd, 0)) == 82 MAP_FAILED) 83 err(1, "cannot mmap %s", filename); 84 close(fd); 85 86 base = (const char *)mapbase; 87 shdrs = (const Elf_Shdr *)(base + h.e_shoff); 88 89 /* Find the symbol table and associated string table section. */ 90 for (i = 1; i < h.e_shnum; i++) 91 if (shdrs[i].sh_type == SHT_SYMTAB) 92 break; 93 if (i == h.e_shnum) 94 errx(1, "%s has no symbol table", filename); 95 sh_symtab = &shdrs[i]; 96 sh_strtab = &shdrs[sh_symtab->sh_link]; 97 98 symtab = (const Elf_Sym *)(base + sh_symtab->sh_offset); 99 symtabct = sh_symtab->sh_size / sh_symtab->sh_entsize; 100 strtab = (const char *)(base + sh_strtab->sh_offset); 101 102 /* Count the symbols that we're interested in. */ 103 nname = 0; 104 for (i = 1; i < symtabct; i++) 105 if (wantsym(&symtab[i], strtab)) 106 nname++; 107 108 /* Allocate memory for them, plus a terminating entry. */ 109 if ((nl = (nltype *)calloc(nname + 1, sizeof(nltype))) == NULL) 110 errx(1, "insufficient memory for symbol table"); 111 112 /* Read them in. */ 113 npe = nl; 114 for (i = 1; i < symtabct; i++) { 115 const Elf_Sym *sym = &symtab[i]; 116 117 if (wantsym(sym, strtab)) { 118 npe->value = sym->st_value; 119 npe->name = strtab + sym->st_name; 120 npe++; 121 } 122 } 123 npe->value = -1; 124 125 *defaultEs = excludes; 126 return 0; 127 } 128 129 static bool 130 wantsym(const Elf_Sym *sym, const char *strtab) 131 { 132 int type; 133 int bind; 134 135 type = ELF_ST_TYPE(sym->st_info); 136 bind = ELF_ST_BIND(sym->st_info); 137 138 if (type != STT_FUNC || 139 (aflag && bind == STB_LOCAL) || 140 (uflag && strchr(strtab + sym->st_name, '.') != NULL)) 141 return 0; 142 143 return 1; 144 } 145