1 /* Copyright (C) 2002, 2005 Red Hat, Inc. 2 This file is part of elfutils. 3 Written by Ulrich Drepper <drepper (at) redhat.com>, 2002. 4 5 This file is free software; you can redistribute it and/or modify 6 it under the terms of the GNU General Public License as published by 7 the Free Software Foundation; either version 3 of the License, or 8 (at your option) any later version. 9 10 elfutils is distributed in the hope that it will be useful, but 11 WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 GNU General Public License for more details. 14 15 You should have received a copy of the GNU General Public License 16 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 17 18 #ifdef HAVE_CONFIG_H 19 # include <config.h> 20 #endif 21 22 #include <fcntl.h> 23 #include <inttypes.h> 24 #include ELFUTILS_HEADER(asm) 25 #include <libelf.h> 26 #include <stdio.h> 27 #include <unistd.h> 28 29 30 static const char fname[] = "asm-tst7-out.o"; 31 32 33 int 34 main (void) 35 { 36 int result = 0; 37 size_t cnt; 38 AsmCtx_t *ctx; 39 Elf *elf; 40 int fd; 41 42 elf_version (EV_CURRENT); 43 44 Ebl *ebl = ebl_openbackend_machine (EM_386); 45 if (ebl == NULL) 46 { 47 puts ("cannot open backend library"); 48 return 1; 49 } 50 51 ctx = asm_begin (fname, ebl, false); 52 if (ctx == NULL) 53 { 54 printf ("cannot create assembler context: %s\n", asm_errmsg (-1)); 55 return 1; 56 } 57 58 if (asm_newcomsym (ctx, "commsym", 4, 16) == NULL) 59 { 60 printf ("cannot create common symbol: %s\n", asm_errmsg (-1)); 61 asm_abort (ctx); 62 return 1; 63 } 64 65 /* Create the output file. */ 66 if (asm_end (ctx) != 0) 67 { 68 printf ("cannot create output file: %s\n", asm_errmsg (-1)); 69 asm_abort (ctx); 70 return 1; 71 } 72 73 /* Check the file. */ 74 fd = open (fname, O_RDONLY); 75 if (fd == -1) 76 { 77 printf ("cannot open generated file: %m\n"); 78 result = 1; 79 goto out; 80 } 81 82 elf = elf_begin (fd, ELF_C_READ, NULL); 83 if (elf == NULL) 84 { 85 printf ("cannot create ELF descriptor: %s\n", elf_errmsg (-1)); 86 result = 1; 87 goto out_close; 88 } 89 if (elf_kind (elf) != ELF_K_ELF) 90 { 91 puts ("not a valid ELF file"); 92 result = 1; 93 goto out_close2; 94 } 95 96 for (cnt = 1; 1; ++cnt) 97 { 98 Elf_Scn *scn; 99 GElf_Shdr shdr_mem; 100 GElf_Shdr *shdr; 101 102 scn = elf_getscn (elf, cnt); 103 if (scn == NULL) 104 { 105 printf ("cannot get section %zd: %s\n", cnt, elf_errmsg (-1)); 106 result = 1; 107 continue; 108 } 109 110 shdr = gelf_getshdr (scn, &shdr_mem); 111 if (shdr == NULL) 112 { 113 printf ("cannot get section header for section %zd: %s\n", 114 cnt, elf_errmsg (-1)); 115 result = 1; 116 continue; 117 } 118 /* We are looking for the symbol table. */ 119 if (shdr->sh_type != SHT_SYMTAB) 120 continue; 121 122 for (cnt = 1; cnt< (shdr->sh_size 123 / gelf_fsize (elf, ELF_T_SYM, 1, EV_CURRENT)); 124 ++cnt) 125 { 126 GElf_Sym sym_mem; 127 GElf_Sym *sym; 128 129 if (cnt > 1) 130 { 131 puts ("too many symbol"); 132 result = 1; 133 break; 134 } 135 136 sym = gelf_getsym (elf_getdata (scn, NULL), cnt, &sym_mem); 137 if (sym == NULL) 138 { 139 printf ("cannot get symbol %zu: %s\n", cnt, elf_errmsg (-1)); 140 result = 1; 141 } 142 else 143 { 144 if (sym->st_shndx != SHN_COMMON) 145 { 146 printf ("expected common symbol, got section %u\n", 147 (unsigned int) sym->st_shndx); 148 result = 1; 149 } 150 151 if (sym->st_value != 16) 152 { 153 printf ("requested alignment 16, is %" PRIuMAX "\n", 154 (uintmax_t) sym->st_value); 155 result = 1; 156 } 157 158 if (sym->st_size != 4) 159 { 160 printf ("requested size 4, is %" PRIuMAX "\n", 161 (uintmax_t) sym->st_value); 162 result = 1; 163 } 164 } 165 } 166 167 break; 168 } 169 170 out_close2: 171 elf_end (elf); 172 out_close: 173 close (fd); 174 out: 175 /* We don't need the file anymore. */ 176 unlink (fname); 177 178 ebl_closebackend (ebl); 179 180 return result; 181 } 182
