/*- * Copyright (c) 1983, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include <sys/types.h> #include <sys/mman.h> #include <sys/stat.h> #include <sys/exec_elf.h> #include <err.h> #include <fcntl.h> #include <string.h> #include <unistd.h> #include "gprof.h" static bool wantsym(const Elf_Sym *, const char *); /* Things which get -E excluded by default. */ static char *excludes[] = { ".mcount", "_mcleanup", NULL }; int getnfile(const char *filename, char ***defaultEs) { int fd; Elf_Ehdr h; struct stat s; void *mapbase; const char *base; const Elf_Shdr *shdrs; const Elf_Shdr *sh_symtab; const Elf_Shdr *sh_strtab; const char *strtab; const Elf_Sym *symtab; int symtabct; int i; if ((fd = open(filename, O_RDONLY)) == -1) err(1, "%s", filename); if (read(fd, &h, sizeof h) != sizeof h || !IS_ELF(h)) { close(fd); return -1; } if (fstat(fd, &s) == -1) err(1, "Cannot fstat %s", filename); if ((mapbase = mmap(0, s.st_size, PROT_READ, MAP_SHARED, fd, 0)) == MAP_FAILED) err(1, "Cannot mmap %s", filename); close(fd); base = (const char *)mapbase; shdrs = (const Elf_Shdr *)(base + h.e_shoff); /* Find the symbol table and associated string table section. */ for (i = 1; i < h.e_shnum; i++) if (shdrs[i].sh_type == SHT_SYMTAB) break; if (i == h.e_shnum) errx(1, "%s has no symbol table", filename); sh_symtab = &shdrs[i]; sh_strtab = &shdrs[sh_symtab->sh_link]; symtab = (const Elf_Sym *)(base + sh_symtab->sh_offset); symtabct = sh_symtab->sh_size / sh_symtab->sh_entsize; strtab = (const char *)(base + sh_strtab->sh_offset); /* Count the symbols that we're interested in. */ nname = 0; for (i = 1; i < symtabct; i++) if (wantsym(&symtab[i], strtab)) nname++; #ifdef DEBUG if (debug & ELFDEBUG) { printf("[getnfile] symtab at %p, strtab at %p\n", symtab, strtab); printf("[getnfile] %d of %d symbols wanted\n", nname, symtabct); } #endif /* Allocate memory for them, plus a terminating entry. */ if ((nl = (nltype *)calloc(nname + 1, sizeof(nltype))) == NULL) errx(1, "Insufficient memory for symbol table"); /* Read them in. */ npe = nl; for (i = 1; i < symtabct; i++) { const Elf_Sym *sym = &symtab[i]; if (wantsym(sym, strtab)) { npe->value = sym->st_value; npe->name = strtab + sym->st_name; #ifdef DEBUG if (debug & ELFDEBUG) printf("[getnfile] symbol %d: %s -> %lx\n", i, npe->name ? npe->name : "(none)", npe->value); #endif npe++; } } npe->value = -1; *defaultEs = excludes; return 0; } static bool wantsym(const Elf_Sym *sym, const char *strtab) { int type; int bind; type = ELF_ST_TYPE(sym->st_info); bind = ELF_ST_BIND(sym->st_info); if (type != STT_FUNC || (aflag && bind == STB_LOCAL)) #if 0 || (uflag && strchr(strtab + sym->st_name, '.') != NULL)) #endif return 0; #ifdef __arm__ /* ignore what gas calls "mapping symbols" */ { const char *c = strtab + sym->st_name; if (c[0] == '$') return 0; } #endif return 1; }