Annotation of src/usr.bin/gprof/elf.c, Revision 1.3
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.
1.2 millert 13: * 3. Neither the name of the University nor the names of its contributors
1.1 art 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: #include <sys/types.h>
31: #include <sys/mman.h>
32: #include <sys/stat.h>
33: #include <sys/exec_elf.h>
34:
35: #include <err.h>
36: #include <fcntl.h>
37: #include <string.h>
38: #include <unistd.h>
39:
40: #include "gprof.h"
41:
42: static bool wantsym(const Elf_Sym *, const char *);
43:
44: /* Things which get -E excluded by default. */
45: static char *excludes[] = { ".mcount", "_mcleanup", NULL };
46:
47: int
48: getnfile(const char *filename, char ***defaultEs)
49: {
50: int fd;
51: Elf_Ehdr h;
52: struct stat s;
53: void *mapbase;
54: const char *base;
55: const Elf_Shdr *shdrs;
56: const Elf_Shdr *sh_symtab;
57: const Elf_Shdr *sh_strtab;
58: const char *strtab;
59: const Elf_Sym *symtab;
60: int symtabct;
61: int i;
62:
63: if ((fd = open(filename, O_RDONLY)) == -1)
64: err(1, "%s", filename);
65: if (read(fd, &h, sizeof h) != sizeof h || !IS_ELF(h)) {
66: close(fd);
67: return -1;
68: }
69: if (fstat(fd, &s) == -1)
70: err(1, "Cannot fstat %s", filename);
71: if ((mapbase = mmap(0, s.st_size, PROT_READ, MAP_SHARED, fd, 0)) ==
72: MAP_FAILED)
73: err(1, "Cannot mmap %s", filename);
74: close(fd);
75:
76: base = (const char *)mapbase;
77: shdrs = (const Elf_Shdr *)(base + h.e_shoff);
78:
79: /* Find the symbol table and associated string table section. */
80: for (i = 1; i < h.e_shnum; i++)
81: if (shdrs[i].sh_type == SHT_SYMTAB)
82: break;
83: if (i == h.e_shnum)
84: errx(1, "%s has no symbol table", filename);
85: sh_symtab = &shdrs[i];
86: sh_strtab = &shdrs[sh_symtab->sh_link];
87:
88: symtab = (const Elf_Sym *)(base + sh_symtab->sh_offset);
89: symtabct = sh_symtab->sh_size / sh_symtab->sh_entsize;
90: strtab = (const char *)(base + sh_strtab->sh_offset);
91:
92: /* Count the symbols that we're interested in. */
93: nname = 0;
94: for (i = 1; i < symtabct; i++)
95: if (wantsym(&symtab[i], strtab))
96: nname++;
97:
1.3 ! marc 98: #ifdef DEBUG
! 99: if (debug & ELFDEBUG) {
! 100: printf("[getnfile] symtab at %p, strtab at %p\n", symtab, strtab);
! 101: printf("[getnfile] %d of %d symbols wanted\n", nname, symtabct);
! 102: }
! 103: #endif
! 104:
1.1 art 105: /* Allocate memory for them, plus a terminating entry. */
106: if ((nl = (nltype *)calloc(nname + 1, sizeof(nltype))) == NULL)
107: errx(1, "Insufficient memory for symbol table");
108:
109: /* Read them in. */
110: npe = nl;
111: for (i = 1; i < symtabct; i++) {
112: const Elf_Sym *sym = &symtab[i];
113:
114: if (wantsym(sym, strtab)) {
115: npe->value = sym->st_value;
116: npe->name = strtab + sym->st_name;
1.3 ! marc 117: #ifdef DEBUG
! 118: if (debug & ELFDEBUG)
! 119: printf("[getnfile] symbol %d: %s -> %lx\n", i,
! 120: npe->name ? npe->name : "(none)", npe->value);
! 121: #endif
1.1 art 122: npe++;
123: }
124: }
125: npe->value = -1;
126:
127: *defaultEs = excludes;
128: return 0;
129: }
130:
131: static bool
132: wantsym(const Elf_Sym *sym, const char *strtab)
133: {
134: int type;
135: int bind;
136:
137: type = ELF_ST_TYPE(sym->st_info);
138: bind = ELF_ST_BIND(sym->st_info);
139:
140: if (type != STT_FUNC || (aflag && bind == STB_LOCAL))
141: #if 0
142: ||
143: (uflag && strchr(strtab + sym->st_name, '.') != NULL))
144: #endif
145: return 0;
146:
147: return 1;
148: }
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