Annotation of src/usr.bin/gprof/elf.c, Revision 1.1
1.1 ! art 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: * 3. All advertising materials mentioning features or use of this software
! 14: * must display the following acknowledgement:
! 15: * This product includes software developed by the University of
! 16: * California, Berkeley and its contributors.
! 17: * 4. Neither the name of the University nor the names of its contributors
! 18: * may be used to endorse or promote products derived from this software
! 19: * without specific prior written permission.
! 20: *
! 21: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 22: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 23: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 24: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 25: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 26: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 27: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 28: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 29: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 30: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 31: * SUCH DAMAGE.
! 32: */
! 33:
! 34: #include <sys/types.h>
! 35: #include <sys/mman.h>
! 36: #include <sys/stat.h>
! 37: #include <sys/exec_elf.h>
! 38:
! 39: #include <err.h>
! 40: #include <fcntl.h>
! 41: #include <string.h>
! 42: #include <unistd.h>
! 43:
! 44: #include "gprof.h"
! 45:
! 46: static bool wantsym(const Elf_Sym *, const char *);
! 47:
! 48: /* Things which get -E excluded by default. */
! 49: static char *excludes[] = { ".mcount", "_mcleanup", NULL };
! 50:
! 51: int
! 52: getnfile(const char *filename, char ***defaultEs)
! 53: {
! 54: int fd;
! 55: Elf_Ehdr h;
! 56: struct stat s;
! 57: void *mapbase;
! 58: const char *base;
! 59: const Elf_Shdr *shdrs;
! 60: const Elf_Shdr *sh_symtab;
! 61: const Elf_Shdr *sh_strtab;
! 62: const char *strtab;
! 63: const Elf_Sym *symtab;
! 64: int symtabct;
! 65: int i;
! 66:
! 67: if ((fd = open(filename, O_RDONLY)) == -1)
! 68: err(1, "%s", filename);
! 69: if (read(fd, &h, sizeof h) != sizeof h || !IS_ELF(h)) {
! 70: close(fd);
! 71: return -1;
! 72: }
! 73: if (fstat(fd, &s) == -1)
! 74: err(1, "Cannot fstat %s", filename);
! 75: if ((mapbase = mmap(0, s.st_size, PROT_READ, MAP_SHARED, fd, 0)) ==
! 76: MAP_FAILED)
! 77: err(1, "Cannot mmap %s", filename);
! 78: close(fd);
! 79:
! 80: base = (const char *)mapbase;
! 81: shdrs = (const Elf_Shdr *)(base + h.e_shoff);
! 82:
! 83: /* Find the symbol table and associated string table section. */
! 84: for (i = 1; i < h.e_shnum; i++)
! 85: if (shdrs[i].sh_type == SHT_SYMTAB)
! 86: break;
! 87: if (i == h.e_shnum)
! 88: errx(1, "%s has no symbol table", filename);
! 89: sh_symtab = &shdrs[i];
! 90: sh_strtab = &shdrs[sh_symtab->sh_link];
! 91:
! 92: symtab = (const Elf_Sym *)(base + sh_symtab->sh_offset);
! 93: symtabct = sh_symtab->sh_size / sh_symtab->sh_entsize;
! 94: strtab = (const char *)(base + sh_strtab->sh_offset);
! 95:
! 96: /* Count the symbols that we're interested in. */
! 97: nname = 0;
! 98: for (i = 1; i < symtabct; i++)
! 99: if (wantsym(&symtab[i], strtab))
! 100: nname++;
! 101:
! 102: /* Allocate memory for them, plus a terminating entry. */
! 103: if ((nl = (nltype *)calloc(nname + 1, sizeof(nltype))) == NULL)
! 104: errx(1, "Insufficient memory for symbol table");
! 105:
! 106: /* Read them in. */
! 107: npe = nl;
! 108: for (i = 1; i < symtabct; i++) {
! 109: const Elf_Sym *sym = &symtab[i];
! 110:
! 111: if (wantsym(sym, strtab)) {
! 112: npe->value = sym->st_value;
! 113: npe->name = strtab + sym->st_name;
! 114: npe++;
! 115: }
! 116: }
! 117: npe->value = -1;
! 118:
! 119: *defaultEs = excludes;
! 120: return 0;
! 121: }
! 122:
! 123: static bool
! 124: wantsym(const Elf_Sym *sym, const char *strtab)
! 125: {
! 126: int type;
! 127: int bind;
! 128:
! 129: type = ELF_ST_TYPE(sym->st_info);
! 130: bind = ELF_ST_BIND(sym->st_info);
! 131:
! 132: if (type != STT_FUNC || (aflag && bind == STB_LOCAL))
! 133: #if 0
! 134: ||
! 135: (uflag && strchr(strtab + sym->st_name, '.') != NULL))
! 136: #endif
! 137: return 0;
! 138:
! 139: return 1;
! 140: }
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