1 /* Create descriptor for assembling.
2 Copyright (C) 2002 Red Hat, Inc.
3 This file is part of Red Hat elfutils.
4 Written by Ulrich Drepper <drepper@redhat.com>, 2002.
6 Red Hat elfutils is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by the
8 Free Software Foundation; version 2 of the License.
10 Red Hat 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 GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License along
16 with Red Hat elfutils; if not, write to the Free Software Foundation,
17 Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA.
19 Red Hat elfutils is an included package of the Open Invention Network.
20 An included package of the Open Invention Network is a package for which
21 Open Invention Network licensees cross-license their patents. No patent
22 license is granted, either expressly or impliedly, by designation as an
23 included package. Should you wish to participate in the Open Invention
24 Network licensing program, please visit www.openinventionnetwork.com
25 <http://www.openinventionnetwork.com>. */
34 #include <stdio_ext.h>
45 prepare_text_output (AsmCtx_t *result)
48 result->out.file = stdout;
51 result->out.file = fdopen (result->fd, "a");
52 if (result->out.file == NULL)
59 __fsetlocking (result->out.file, FSETLOCKING_BYCALLER);
67 prepare_binary_output (AsmCtx_t *result, Ebl *ebl)
72 /* Create the ELF descriptor for the file. */
73 result->out.elf = elf_begin (result->fd, ELF_C_WRITE_MMAP, NULL);
74 if (result->out.elf == NULL)
77 unlink (result->tmp_fname);
80 __libasm_seterrno (ASM_E_LIBELF);
84 /* Create the ELF header for the output file. */
85 int class = ebl_get_elfclass (ebl);
86 if (gelf_newehdr (result->out.elf, class) == 0)
89 ehdr = gelf_getehdr (result->out.elf, &ehdr_mem);
90 /* If this failed we are in trouble. */
91 assert (ehdr != NULL);
93 /* We create an object file. */
94 ehdr->e_type = ET_REL;
95 /* Set the ELF version. */
96 ehdr->e_version = EV_CURRENT;
98 /* Use the machine, class, and endianess values from the Ebl descriptor. */
99 ehdr->e_machine = ebl_get_elfmachine (ebl);
100 ehdr->e_ident[EI_CLASS] = class;
101 ehdr->e_ident[EI_DATA] = ebl_get_elfdata (ebl);
103 memcpy (&ehdr->e_ident[EI_MAG0], ELFMAG, SELFMAG);
105 /* Write the ELF header information back. */
106 (void) gelf_update_ehdr (result->out.elf, ehdr);
108 /* No section so far. */
109 result->section_list = NULL;
111 /* Initialize the hash table. */
112 asm_symbol_tab_init (&result->symbol_tab, 67);
113 result->nsymbol_tab = 0;
114 /* And the string tables. */
115 result->section_strtab = ebl_strtabinit (true);
116 result->symbol_strtab = ebl_strtabinit (true);
118 /* We have no section groups so far. */
119 result->groups = NULL;
127 asm_begin (fname, ebl, 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);