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 <inttypes.h>
24 #include ELFUTILS_HEADER(ebl)
25 #include ELFUTILS_HEADER(asm)
26 #include <libelf.h>
27 #include <stdio.h>
28 #include <unistd.h>
29
30
31 static const char fname[] = "asm-tst7-out.o";
32
33
34 int
main(void)35 main (void)
36 {
37 int result = 0;
38 size_t cnt;
39 AsmCtx_t *ctx;
40 Elf *elf;
41 int fd;
42
43 elf_version (EV_CURRENT);
44
45 Ebl *ebl = ebl_openbackend_machine (EM_386);
46 if (ebl == NULL)
47 {
48 puts ("cannot open backend library");
49 return 1;
50 }
51
52 ctx = asm_begin (fname, ebl, false);
53 if (ctx == NULL)
54 {
55 printf ("cannot create assembler context: %s\n", asm_errmsg (-1));
56 return 1;
57 }
58
59 if (asm_newcomsym (ctx, "commsym", 4, 16) == NULL)
60 {
61 printf ("cannot create common symbol: %s\n", asm_errmsg (-1));
62 asm_abort (ctx);
63 return 1;
64 }
65
66 /* Create the output file. */
67 if (asm_end (ctx) != 0)
68 {
69 printf ("cannot create output file: %s\n", asm_errmsg (-1));
70 asm_abort (ctx);
71 return 1;
72 }
73
74 /* Check the file. */
75 fd = open (fname, O_RDONLY);
76 if (fd == -1)
77 {
78 printf ("cannot open generated file: %m\n");
79 result = 1;
80 goto out;
81 }
82
83 elf = elf_begin (fd, ELF_C_READ, NULL);
84 if (elf == NULL)
85 {
86 printf ("cannot create ELF descriptor: %s\n", elf_errmsg (-1));
87 result = 1;
88 goto out_close;
89 }
90 if (elf_kind (elf) != ELF_K_ELF)
91 {
92 puts ("not a valid ELF file");
93 result = 1;
94 goto out_close2;
95 }
96
97 for (cnt = 1; 1; ++cnt)
98 {
99 Elf_Scn *scn;
100 GElf_Shdr shdr_mem;
101 GElf_Shdr *shdr;
102
103 scn = elf_getscn (elf, cnt);
104 if (scn == NULL)
105 {
106 printf ("cannot get section %zd: %s\n", cnt, elf_errmsg (-1));
107 result = 1;
108 continue;
109 }
110
111 shdr = gelf_getshdr (scn, &shdr_mem);
112 if (shdr == NULL)
113 {
114 printf ("cannot get section header for section %zd: %s\n",
115 cnt, elf_errmsg (-1));
116 result = 1;
117 continue;
118 }
119 /* We are looking for the symbol table. */
120 if (shdr->sh_type != SHT_SYMTAB)
121 continue;
122
123 for (cnt = 1; cnt< (shdr->sh_size
124 / gelf_fsize (elf, ELF_T_SYM, 1, EV_CURRENT));
125 ++cnt)
126 {
127 GElf_Sym sym_mem;
128 GElf_Sym *sym;
129
130 if (cnt > 1)
131 {
132 puts ("too many symbol");
133 result = 1;
134 break;
135 }
136
137 sym = gelf_getsym (elf_getdata (scn, NULL), cnt, &sym_mem);
138 if (sym == NULL)
139 {
140 printf ("cannot get symbol %zu: %s\n", cnt, elf_errmsg (-1));
141 result = 1;
142 }
143 else
144 {
145 if (sym->st_shndx != SHN_COMMON)
146 {
147 printf ("expected common symbol, got section %u\n",
148 (unsigned int) sym->st_shndx);
149 result = 1;
150 }
151
152 if (sym->st_value != 16)
153 {
154 printf ("requested alignment 16, is %" PRIuMAX "\n",
155 (uintmax_t) sym->st_value);
156 result = 1;
157 }
158
159 if (sym->st_size != 4)
160 {
161 printf ("requested size 4, is %" PRIuMAX "\n",
162 (uintmax_t) sym->st_value);
163 result = 1;
164 }
165 }
166 }
167
168 break;
169 }
170
171 out_close2:
172 elf_end (elf);
173 out_close:
174 close (fd);
175 out:
176 /* We don't need the file anymore. */
177 unlink (fname);
178
179 ebl_closebackend (ebl);
180
181 return result;
182 }
183