The Android Open Source Project | 593c365 | 2008-10-21 07:00:00 -0700 | [diff] [blame^] | 1 | /* Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc. |
| 2 | Written by Ulrich Drepper <drepper@redhat.com>, 1998. |
| 3 | |
| 4 | This program is Open Source software; you can redistribute it and/or |
| 5 | modify it under the terms of the Open Software License version 1.0 as |
| 6 | published by the Open Source Initiative. |
| 7 | |
| 8 | You should have received a copy of the Open Software License along |
| 9 | with this program; if not, you may obtain a copy of the Open Software |
| 10 | License version 1.0 from http://www.opensource.org/licenses/osl.php or |
| 11 | by writing the Open Source Initiative c/o Lawrence Rosen, Esq., |
| 12 | 3001 King Ranch Road, Ukiah, CA 95482. */ |
| 13 | |
| 14 | #include <config.h> |
| 15 | |
| 16 | #include <errno.h> |
| 17 | #include <error.h> |
| 18 | #include <fcntl.h> |
| 19 | #include <gelf.h> |
| 20 | #include <inttypes.h> |
| 21 | #include <stdio.h> |
| 22 | #include <stdlib.h> |
| 23 | #include <unistd.h> |
| 24 | |
| 25 | |
| 26 | /* Prototypes for local functions. */ |
| 27 | static int handle_section (Elf *elf, Elf_Scn *scn); |
| 28 | static void print_bytes (Elf_Data *data); |
| 29 | static void print_symtab (Elf *elf, Elf_Data *data); |
| 30 | |
| 31 | |
| 32 | int |
| 33 | main (int argc, char *argv[]) |
| 34 | { |
| 35 | Elf *elf; |
| 36 | int fd; |
| 37 | int cnt; |
| 38 | |
| 39 | if (argc <= 1) |
| 40 | exit (1); |
| 41 | |
| 42 | /* Open the test file. This is given as the first parameter to the |
| 43 | program. */ |
| 44 | fd = open (argv[1], O_RDONLY); |
| 45 | if (fd == -1) |
| 46 | error (EXIT_FAILURE, errno, "cannot open input file `%s'", argv[1]); |
| 47 | |
| 48 | /* Set the library versio we expect. */ |
| 49 | elf_version (EV_CURRENT); |
| 50 | |
| 51 | /* Create the ELF descriptor. */ |
| 52 | elf = elf_begin (fd, ELF_C_READ, NULL); |
| 53 | if (elf == NULL) |
| 54 | error (EXIT_FAILURE, 0, "cannot create ELF descriptor: %s", |
| 55 | elf_errmsg (0)); |
| 56 | |
| 57 | /* Now proces all the sections mentioned in the rest of the command line. */ |
| 58 | for (cnt = 2; cnt < argc; ++cnt) |
| 59 | if (handle_section (elf, elf_getscn (elf, atoi (argv[cnt]))) != 0) |
| 60 | /* When we encounter an error stop immediately. */ |
| 61 | error (EXIT_FAILURE, 0, "while processing section %d: %s", cnt, |
| 62 | elf_errmsg (0)); |
| 63 | |
| 64 | /* Close the descriptor. */ |
| 65 | if (elf_end (elf) != 0) |
| 66 | error (EXIT_FAILURE, 0, "failure while closing ELF descriptor: %s", |
| 67 | elf_errmsg (0)); |
| 68 | |
| 69 | return 0; |
| 70 | } |
| 71 | |
| 72 | |
| 73 | static int |
| 74 | handle_section (Elf *elf, Elf_Scn *scn) |
| 75 | { |
| 76 | GElf_Ehdr *ehdr; |
| 77 | GElf_Ehdr ehdr_mem; |
| 78 | GElf_Shdr *shdr; |
| 79 | GElf_Shdr shdr_mem; |
| 80 | Elf_Data *data; |
| 81 | |
| 82 | /* First get the ELF and section header. */ |
| 83 | ehdr = gelf_getehdr (elf, &ehdr_mem); |
| 84 | shdr = gelf_getshdr (scn, &shdr_mem); |
| 85 | if (ehdr == NULL || shdr == NULL) |
| 86 | return 1; |
| 87 | |
| 88 | /* Print the information from the ELF section header. */ |
| 89 | printf ("name = %s\n" |
| 90 | "type = %" PRId32 "\n" |
| 91 | "flags = %" PRIx64 "\n" |
| 92 | "addr = %" PRIx64 "\n" |
| 93 | "offset = %" PRIx64 "\n" |
| 94 | "size = %" PRId64 "\n" |
| 95 | "link = %" PRId32 "\n" |
| 96 | "info = %" PRIx32 "\n" |
| 97 | "addralign = %" PRIx64 "\n" |
| 98 | "entsize = %" PRId64 "\n", |
| 99 | elf_strptr (elf, ehdr->e_shstrndx, shdr->sh_name), |
| 100 | shdr->sh_type, |
| 101 | shdr->sh_flags, |
| 102 | shdr->sh_addr, |
| 103 | shdr->sh_offset, |
| 104 | shdr->sh_size, |
| 105 | shdr->sh_link, |
| 106 | shdr->sh_info, |
| 107 | shdr->sh_addralign, |
| 108 | shdr->sh_entsize); |
| 109 | |
| 110 | /* Get the section data now. */ |
| 111 | data = elf_getdata (scn, NULL); |
| 112 | if (data == NULL) |
| 113 | return 1; |
| 114 | |
| 115 | /* Now proces the different section types accordingly. */ |
| 116 | switch (shdr->sh_type) |
| 117 | { |
| 118 | case SHT_SYMTAB: |
| 119 | print_symtab (elf, data); |
| 120 | break; |
| 121 | |
| 122 | case SHT_PROGBITS: |
| 123 | default: |
| 124 | print_bytes (data); |
| 125 | break; |
| 126 | } |
| 127 | |
| 128 | /* Separate form the next section. */ |
| 129 | puts (""); |
| 130 | |
| 131 | /* All done correctly. */ |
| 132 | return 0; |
| 133 | } |
| 134 | |
| 135 | |
| 136 | static void |
| 137 | print_bytes (Elf_Data *data) |
| 138 | { |
| 139 | size_t size = data->d_size; |
| 140 | off_t offset = data->d_off; |
| 141 | unsigned char *buf = (unsigned char *) data->d_buf; |
| 142 | size_t cnt; |
| 143 | |
| 144 | for (cnt = 0; cnt < size; cnt += 16) |
| 145 | { |
| 146 | size_t inner; |
| 147 | |
| 148 | printf ("%*Zx: ", sizeof (size_t) == 4 ? 8 : 16, (size_t) offset + cnt); |
| 149 | |
| 150 | for (inner = 0; inner < 16 && cnt + inner < size; ++inner) |
| 151 | printf (" %02hhx", buf[cnt + inner]); |
| 152 | |
| 153 | puts (""); |
| 154 | } |
| 155 | } |
| 156 | |
| 157 | |
| 158 | static void |
| 159 | print_symtab (Elf *elf, Elf_Data *data) |
| 160 | { |
| 161 | int class = gelf_getclass (elf); |
| 162 | size_t nsym = data->d_size / (class == ELFCLASS32 |
| 163 | ? sizeof (Elf32_Sym) : sizeof (Elf64_Sym)); |
| 164 | size_t cnt; |
| 165 | |
| 166 | for (cnt = 0; cnt < nsym; ++cnt) |
| 167 | { |
| 168 | GElf_Sym sym_mem; |
| 169 | GElf_Sym *sym = gelf_getsym (data, cnt, &sym_mem); |
| 170 | |
| 171 | printf ("%5Zu: %*" PRIx64 " %6" PRIx64 " %4d\n", |
| 172 | cnt, |
| 173 | class == ELFCLASS32 ? 8 : 16, |
| 174 | sym->st_value, |
| 175 | sym->st_size, |
| 176 | GELF_ST_TYPE (sym->st_info)); |
| 177 | } |
| 178 | } |