1 /* Copyright (C) 2002, 2005 Red Hat, Inc.
2 This file is part of elfutils.
3 Written by Ulrich Drepper <drepper@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 ELFUTILS_HEADER(asm)
24 #include <libelf.h>
25 #include <stdio.h>
26 #include <string.h>
27 #include <unistd.h>
28
29
30 static const char fname[] = "asm-tst1-out.o";
31
32
33 static const GElf_Ehdr expected_ehdr =
34 {
35 .e_ident = { [EI_MAG0] = ELFMAG0,
36 [EI_MAG1] = ELFMAG1,
37 [EI_MAG2] = ELFMAG2,
38 [EI_MAG3] = ELFMAG3,
39 [EI_CLASS] = ELFCLASS32,
40 [EI_DATA] = ELFDATA2LSB,
41 [EI_VERSION] = EV_CURRENT },
42 .e_type = ET_REL,
43 .e_machine = EM_386,
44 .e_version = EV_CURRENT,
45 .e_shoff = 88,
46 .e_ehsize = sizeof (Elf32_Ehdr),
47 .e_shentsize = sizeof (Elf32_Shdr),
48 .e_shnum = 4,
49 .e_shstrndx = 3
50 };
51
52
53 static const char *scnnames[4] =
54 {
55 [0] = "",
56 [1] = ".text",
57 [2] = ".data",
58 [3] = ".shstrtab"
59 };
60
61
62 int
main(void)63 main (void)
64 {
65 AsmCtx_t *ctx;
66 AsmScn_t *scn1;
67 AsmScn_t *scn2;
68 int fd;
69 Elf *elf;
70 GElf_Ehdr ehdr_mem;
71 GElf_Ehdr *ehdr;
72 int result = 0;
73 size_t cnt;
74
75 elf_version (EV_CURRENT);
76
77 Ebl *ebl = ebl_openbackend_machine (EM_386);
78 if (ebl == NULL)
79 {
80 puts ("cannot open backend library");
81 return 1;
82 }
83
84 ctx = asm_begin (fname, ebl, false);
85 if (ctx == NULL)
86 {
87 printf ("cannot create assembler context: %s\n", asm_errmsg (-1));
88 return 1;
89 }
90
91 /* Create two sections. */
92 scn1 = asm_newscn (ctx, ".text", SHT_PROGBITS, SHF_ALLOC | SHF_EXECINSTR);
93 scn2 = asm_newscn (ctx, ".data", SHT_PROGBITS, SHF_ALLOC | SHF_WRITE);
94 if (scn1 == NULL || scn2 == NULL)
95 {
96 printf ("cannot create section in output file: %s\n", asm_errmsg (-1));
97 asm_abort (ctx);
98 return 1;
99 }
100
101 /* Special alignment for the .text section. */
102 if (asm_align (scn1, 32) != 0)
103 {
104 printf ("cannot align .text section: %s\n", asm_errmsg (-1));
105 result = 1;
106 }
107
108 /* Create the output file. */
109 if (asm_end (ctx) != 0)
110 {
111 printf ("cannot create output file: %s\n", asm_errmsg (-1));
112 asm_abort (ctx);
113 return 1;
114 }
115
116 /* Check the file. */
117 fd = open (fname, O_RDONLY);
118 if (fd == -1)
119 {
120 printf ("cannot open generated file: %m\n");
121 result = 1;
122 goto out;
123 }
124
125 elf = elf_begin (fd, ELF_C_READ, NULL);
126 if (elf == NULL)
127 {
128 printf ("cannot create ELF descriptor: %s\n", elf_errmsg (-1));
129 result = 1;
130 goto out_close;
131 }
132 if (elf_kind (elf) != ELF_K_ELF)
133 {
134 puts ("not a valid ELF file");
135 result = 1;
136 goto out_close2;
137 }
138
139 ehdr = gelf_getehdr (elf, &ehdr_mem);
140 if (ehdr == NULL)
141 {
142 printf ("cannot get ELF header: %s\n", elf_errmsg (-1));
143 result = 1;
144 goto out_close2;
145 }
146
147 if (memcmp (ehdr, &expected_ehdr, sizeof (GElf_Ehdr)) != 0)
148 {
149 puts ("ELF header does not match");
150 result = 1;
151 goto out_close2;
152 }
153
154 for (cnt = 1; cnt < 4; ++cnt)
155 {
156 Elf_Scn *scn;
157 GElf_Shdr shdr_mem;
158 GElf_Shdr *shdr;
159
160 scn = elf_getscn (elf, cnt);
161 if (scn == NULL)
162 {
163 printf ("cannot get section %zd: %s\n", cnt, elf_errmsg (-1));
164 result = 1;
165 continue;
166 }
167
168 shdr = gelf_getshdr (scn, &shdr_mem);
169 if (shdr == NULL)
170 {
171 printf ("cannot get section header for section %zd: %s\n",
172 cnt, elf_errmsg (-1));
173 result = 1;
174 continue;
175 }
176
177 if (strcmp (elf_strptr (elf, ehdr->e_shstrndx, shdr->sh_name),
178 scnnames[cnt]) != 0)
179 {
180 printf ("section %zd's name differs: %s vs %s\n", cnt,
181 elf_strptr (elf, ehdr->e_shstrndx, shdr->sh_name),
182 scnnames[cnt]);
183 result = 1;
184 }
185
186 if (shdr->sh_type != (cnt == 3 ? SHT_STRTAB : SHT_PROGBITS))
187 {
188 printf ("section %zd's type differs\n", cnt);
189 result = 1;
190 }
191
192 if ((cnt == 1 && shdr->sh_flags != (SHF_ALLOC | SHF_EXECINSTR))
193 || (cnt == 2 && shdr->sh_flags != (SHF_ALLOC | SHF_WRITE))
194 || (cnt == 3 && shdr->sh_flags != 0))
195 {
196 printf ("section %zd's flags differs\n", cnt);
197 result = 1;
198 }
199
200 if (shdr->sh_addr != 0)
201 {
202 printf ("section %zd's address differs\n", cnt);
203 result = 1;
204 }
205
206 if (shdr->sh_offset != ((sizeof (Elf32_Ehdr) + 31) & ~31))
207 {
208 printf ("section %zd's offset differs\n", cnt);
209 result = 1;
210 }
211
212 if ((cnt != 3 && shdr->sh_size != 0)
213 || (cnt == 3 && shdr->sh_size != 23))
214 {
215 printf ("section %zd's size differs\n", cnt);
216 result = 1;
217 }
218
219 if (shdr->sh_link != 0)
220 {
221 printf ("section %zd's link differs\n", cnt);
222 result = 1;
223 }
224
225 if (shdr->sh_info != 0)
226 {
227 printf ("section %zd's info differs\n", cnt);
228 result = 1;
229 }
230
231 if ((cnt == 1 && shdr->sh_addralign != 32)
232 || (cnt != 1 && shdr->sh_addralign != 1))
233 {
234 printf ("section %zd's addralign differs\n", cnt);
235 result = 1;
236 }
237
238 if (shdr->sh_entsize != 0)
239 {
240 printf ("section %zd's entsize differs\n", cnt);
241 result = 1;
242 }
243 }
244
245 out_close2:
246 elf_end (elf);
247 out_close:
248 close (fd);
249 out:
250 /* We don't need the file anymore. */
251 unlink (fname);
252
253 ebl_closebackend (ebl);
254
255 return result;
256 }
257