1*90a99070Sart /*- 2*90a99070Sart * Copyright (c) 1983, 1993 3*90a99070Sart * The Regents of the University of California. All rights reserved. 4*90a99070Sart * 5*90a99070Sart * Redistribution and use in source and binary forms, with or without 6*90a99070Sart * modification, are permitted provided that the following conditions 7*90a99070Sart * are met: 8*90a99070Sart * 1. Redistributions of source code must retain the above copyright 9*90a99070Sart * notice, this list of conditions and the following disclaimer. 10*90a99070Sart * 2. Redistributions in binary form must reproduce the above copyright 11*90a99070Sart * notice, this list of conditions and the following disclaimer in the 12*90a99070Sart * documentation and/or other materials provided with the distribution. 13*90a99070Sart * 3. All advertising materials mentioning features or use of this software 14*90a99070Sart * must display the following acknowledgement: 15*90a99070Sart * This product includes software developed by the University of 16*90a99070Sart * California, Berkeley and its contributors. 17*90a99070Sart * 4. Neither the name of the University nor the names of its contributors 18*90a99070Sart * may be used to endorse or promote products derived from this software 19*90a99070Sart * without specific prior written permission. 20*90a99070Sart * 21*90a99070Sart * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22*90a99070Sart * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23*90a99070Sart * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24*90a99070Sart * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25*90a99070Sart * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26*90a99070Sart * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27*90a99070Sart * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28*90a99070Sart * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29*90a99070Sart * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30*90a99070Sart * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31*90a99070Sart * SUCH DAMAGE. 32*90a99070Sart */ 33*90a99070Sart 34*90a99070Sart #include <sys/types.h> 35*90a99070Sart #include <sys/mman.h> 36*90a99070Sart #include <sys/stat.h> 37*90a99070Sart #include <sys/exec_elf.h> 38*90a99070Sart 39*90a99070Sart #include <err.h> 40*90a99070Sart #include <fcntl.h> 41*90a99070Sart #include <string.h> 42*90a99070Sart #include <unistd.h> 43*90a99070Sart 44*90a99070Sart #include "gprof.h" 45*90a99070Sart 46*90a99070Sart static bool wantsym(const Elf_Sym *, const char *); 47*90a99070Sart 48*90a99070Sart /* Things which get -E excluded by default. */ 49*90a99070Sart static char *excludes[] = { ".mcount", "_mcleanup", NULL }; 50*90a99070Sart 51*90a99070Sart int 52*90a99070Sart getnfile(const char *filename, char ***defaultEs) 53*90a99070Sart { 54*90a99070Sart int fd; 55*90a99070Sart Elf_Ehdr h; 56*90a99070Sart struct stat s; 57*90a99070Sart void *mapbase; 58*90a99070Sart const char *base; 59*90a99070Sart const Elf_Shdr *shdrs; 60*90a99070Sart const Elf_Shdr *sh_symtab; 61*90a99070Sart const Elf_Shdr *sh_strtab; 62*90a99070Sart const char *strtab; 63*90a99070Sart const Elf_Sym *symtab; 64*90a99070Sart int symtabct; 65*90a99070Sart int i; 66*90a99070Sart 67*90a99070Sart if ((fd = open(filename, O_RDONLY)) == -1) 68*90a99070Sart err(1, "%s", filename); 69*90a99070Sart if (read(fd, &h, sizeof h) != sizeof h || !IS_ELF(h)) { 70*90a99070Sart close(fd); 71*90a99070Sart return -1; 72*90a99070Sart } 73*90a99070Sart if (fstat(fd, &s) == -1) 74*90a99070Sart err(1, "Cannot fstat %s", filename); 75*90a99070Sart if ((mapbase = mmap(0, s.st_size, PROT_READ, MAP_SHARED, fd, 0)) == 76*90a99070Sart MAP_FAILED) 77*90a99070Sart err(1, "Cannot mmap %s", filename); 78*90a99070Sart close(fd); 79*90a99070Sart 80*90a99070Sart base = (const char *)mapbase; 81*90a99070Sart shdrs = (const Elf_Shdr *)(base + h.e_shoff); 82*90a99070Sart 83*90a99070Sart /* Find the symbol table and associated string table section. */ 84*90a99070Sart for (i = 1; i < h.e_shnum; i++) 85*90a99070Sart if (shdrs[i].sh_type == SHT_SYMTAB) 86*90a99070Sart break; 87*90a99070Sart if (i == h.e_shnum) 88*90a99070Sart errx(1, "%s has no symbol table", filename); 89*90a99070Sart sh_symtab = &shdrs[i]; 90*90a99070Sart sh_strtab = &shdrs[sh_symtab->sh_link]; 91*90a99070Sart 92*90a99070Sart symtab = (const Elf_Sym *)(base + sh_symtab->sh_offset); 93*90a99070Sart symtabct = sh_symtab->sh_size / sh_symtab->sh_entsize; 94*90a99070Sart strtab = (const char *)(base + sh_strtab->sh_offset); 95*90a99070Sart 96*90a99070Sart /* Count the symbols that we're interested in. */ 97*90a99070Sart nname = 0; 98*90a99070Sart for (i = 1; i < symtabct; i++) 99*90a99070Sart if (wantsym(&symtab[i], strtab)) 100*90a99070Sart nname++; 101*90a99070Sart 102*90a99070Sart /* Allocate memory for them, plus a terminating entry. */ 103*90a99070Sart if ((nl = (nltype *)calloc(nname + 1, sizeof(nltype))) == NULL) 104*90a99070Sart errx(1, "Insufficient memory for symbol table"); 105*90a99070Sart 106*90a99070Sart /* Read them in. */ 107*90a99070Sart npe = nl; 108*90a99070Sart for (i = 1; i < symtabct; i++) { 109*90a99070Sart const Elf_Sym *sym = &symtab[i]; 110*90a99070Sart 111*90a99070Sart if (wantsym(sym, strtab)) { 112*90a99070Sart npe->value = sym->st_value; 113*90a99070Sart npe->name = strtab + sym->st_name; 114*90a99070Sart npe++; 115*90a99070Sart } 116*90a99070Sart } 117*90a99070Sart npe->value = -1; 118*90a99070Sart 119*90a99070Sart *defaultEs = excludes; 120*90a99070Sart return 0; 121*90a99070Sart } 122*90a99070Sart 123*90a99070Sart static bool 124*90a99070Sart wantsym(const Elf_Sym *sym, const char *strtab) 125*90a99070Sart { 126*90a99070Sart int type; 127*90a99070Sart int bind; 128*90a99070Sart 129*90a99070Sart type = ELF_ST_TYPE(sym->st_info); 130*90a99070Sart bind = ELF_ST_BIND(sym->st_info); 131*90a99070Sart 132*90a99070Sart if (type != STT_FUNC || (aflag && bind == STB_LOCAL)) 133*90a99070Sart #if 0 134*90a99070Sart || 135*90a99070Sart (uflag && strchr(strtab + sym->st_name, '.') != NULL)) 136*90a99070Sart #endif 137*90a99070Sart return 0; 138*90a99070Sart 139*90a99070Sart return 1; 140*90a99070Sart } 141