1 /* Create descriptor for assembling.
2 Copyright (C) 2002 Red Hat, Inc.
3 This file is part of elfutils.
4 Written by Ulrich Drepper <drepper@redhat.com>, 2002.
6 This file is free software; you can redistribute it and/or modify
7 it under the terms of either
9 * the GNU Lesser General Public License as published by the Free
10 Software Foundation; either version 3 of the License, or (at
11 your option) any later version
15 * the GNU General Public License as published by the Free
16 Software Foundation; either version 2 of the License, or (at
17 your option) any later version
19 or both in parallel, as here.
21 elfutils is distributed in the hope that it will be useful, but
22 WITHOUT ANY WARRANTY; without even the implied warranty of
23 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
24 General Public License for more details.
26 You should have received copies of the GNU General Public License and
27 the GNU Lesser General Public License along with this program. If
28 not, see <http://www.gnu.org/licenses/>. */
37 #include <stdio_ext.h>
48 prepare_text_output (AsmCtx_t *result)
51 result->out.file = stdout;
54 result->out.file = fdopen (result->fd, "a");
55 if (result->out.file == NULL)
62 __fsetlocking (result->out.file, FSETLOCKING_BYCALLER);
70 prepare_binary_output (AsmCtx_t *result, Ebl *ebl)
75 /* Create the ELF descriptor for the file. */
76 result->out.elf = elf_begin (result->fd, ELF_C_WRITE_MMAP, NULL);
77 if (result->out.elf == NULL)
80 unlink (result->tmp_fname);
83 __libasm_seterrno (ASM_E_LIBELF);
87 /* Create the ELF header for the output file. */
88 int class = ebl_get_elfclass (ebl);
89 if (gelf_newehdr (result->out.elf, class) == 0)
92 ehdr = gelf_getehdr (result->out.elf, &ehdr_mem);
93 /* If this failed we are in trouble. */
94 assert (ehdr != NULL);
96 /* We create an object file. */
97 ehdr->e_type = ET_REL;
98 /* Set the ELF version. */
99 ehdr->e_version = EV_CURRENT;
101 /* Use the machine, class, and endianess values from the Ebl descriptor. */
102 ehdr->e_machine = ebl_get_elfmachine (ebl);
103 ehdr->e_ident[EI_CLASS] = class;
104 ehdr->e_ident[EI_DATA] = ebl_get_elfdata (ebl);
106 memcpy (&ehdr->e_ident[EI_MAG0], ELFMAG, SELFMAG);
108 /* Write the ELF header information back. */
109 (void) gelf_update_ehdr (result->out.elf, ehdr);
111 /* No section so far. */
112 result->section_list = NULL;
114 /* Initialize the hash table. */
115 asm_symbol_tab_init (&result->symbol_tab, 67);
116 result->nsymbol_tab = 0;
117 /* And the string tables. */
118 result->section_strtab = ebl_strtabinit (true);
119 result->symbol_strtab = ebl_strtabinit (true);
121 /* We have no section groups so far. */
122 result->groups = NULL;
130 asm_begin (const char *fname, Ebl *ebl, bool textp)
132 if (fname == NULL && ! textp)
135 size_t fname_len = fname != NULL ? strlen (fname) : 0;
137 /* Create the file descriptor. We do not generate the output file
138 right away. Instead we create a temporary file in the same
139 directory which, if everything goes alright, will replace a
140 possibly existing file with the given name. */
142 = (AsmCtx_t *) malloc (sizeof (AsmCtx_t) + 2 * fname_len + 9);
146 /* Initialize the lock. */
147 rwlock_init (result->lock);
151 /* Create the name of the temporary file. */
152 result->fname = stpcpy (mempcpy (result->tmp_fname, fname, fname_len),
154 memcpy (result->fname, fname, fname_len + 1);
156 /* Create the temporary file. */
157 result->fd = mkstemp (result->tmp_fname);
158 if (result->fd == -1)
160 int save_errno = errno;
162 __libasm_seterrno (ASM_E_CANNOT_CREATE);
170 /* Initialize the counter for temporary symbols. */
171 result->tempsym_count = 0;
173 /* Now we differentiate between textual and binary output. */
174 result->textp = textp;
176 result = prepare_text_output (result);
178 result = prepare_binary_output (result, ebl);