Merge "Export elfutils headers and lose the version number from the path."

1 files changed, 181 insertions, 0 deletions

diff --git a/src/libasm/asm_begin.c b/src/libasm/asm_begin.c
new file mode 100644
index 00000000..b8094dcd
--- /dev/null
+++ b/src/libasm/asm_begin.c
@@ -0,0 +1,181 @@
+/* Create descriptor for assembling.
+   Copyright (C) 2002 Red Hat, Inc.
+   This file is part of Red Hat elfutils.
+   Written by Ulrich Drepper <drepper@redhat.com>, 2002.
+
+   Red Hat elfutils is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by the
+   Free Software Foundation; version 2 of the License.
+
+   Red Hat elfutils is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License along
+   with Red Hat elfutils; if not, write to the Free Software Foundation,
+   Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA.
+
+   Red Hat elfutils is an included package of the Open Invention Network.
+   An included package of the Open Invention Network is a package for which
+   Open Invention Network licensees cross-license their patents.  No patent
+   license is granted, either expressly or impliedly, by designation as an
+   included package.  Should you wish to participate in the Open Invention
+   Network licensing program, please visit www.openinventionnetwork.com
+   <http://www.openinventionnetwork.com>.  */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <assert.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdio_ext.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <gelf.h>
+#include "libasmP.h"
+#include <system.h>
+
+
+static AsmCtx_t *
+prepare_text_output (AsmCtx_t *result)
+{
+  if (result->fd == -1)
+    result->out.file = stdout;
+  else
+    {
+      result->out.file = fdopen (result->fd, "a");
+      if (result->out.file == NULL)
+	{
+	  close (result->fd);
+	  free (result);
+	  result = NULL;
+	}
+
+      __fsetlocking (result->out.file, FSETLOCKING_BYCALLER);
+    }
+
+  return result;
+}
+
+
+static AsmCtx_t *
+prepare_binary_output (AsmCtx_t *result, Ebl *ebl)
+{
+  GElf_Ehdr *ehdr;
+  GElf_Ehdr ehdr_mem;
+
+  /* Create the ELF descriptor for the file.  */
+  result->out.elf = elf_begin (result->fd, ELF_C_WRITE_MMAP, NULL);
+  if (result->out.elf == NULL)
+    {
+    err_libelf:
+      unlink (result->tmp_fname);
+      close (result->fd);
+      free (result);
+      __libasm_seterrno (ASM_E_LIBELF);
+      return NULL;
+    }
+
+  /* Create the ELF header for the output file.  */
+  int class = ebl_get_elfclass (ebl);
+  if (gelf_newehdr (result->out.elf, class) == 0)
+    goto err_libelf;
+
+  ehdr = gelf_getehdr (result->out.elf, &ehdr_mem);
+  /* If this failed we are in trouble.  */
+  assert (ehdr != NULL);
+
+  /* We create an object file.  */
+  ehdr->e_type = ET_REL;
+  /* Set the ELF version.  */
+  ehdr->e_version = EV_CURRENT;
+
+  /* Use the machine, class, and endianess values from the Ebl descriptor.  */
+  ehdr->e_machine = ebl_get_elfmachine (ebl);
+  ehdr->e_ident[EI_CLASS] = class;
+  ehdr->e_ident[EI_DATA] = ebl_get_elfdata (ebl);
+
+  memcpy (&ehdr->e_ident[EI_MAG0], ELFMAG, SELFMAG);
+
+  /* Write the ELF header information back.  */
+  (void) gelf_update_ehdr (result->out.elf, ehdr);
+
+  /* No section so far.  */
+  result->section_list = NULL;
+
+  /* Initialize the hash table.  */
+  asm_symbol_tab_init (&result->symbol_tab, 67);
+  result->nsymbol_tab = 0;
+  /* And the string tables.  */
+  result->section_strtab = ebl_strtabinit (true);
+  result->symbol_strtab = ebl_strtabinit (true);
+
+  /* We have no section groups so far.  */
+  result->groups = NULL;
+  result->ngroups = 0;
+
+  return result;
+}
+
+
+AsmCtx_t *
+asm_begin (fname, ebl, textp)
+     const char *fname;
+     Ebl *ebl;
+     bool textp;
+{
+  if (fname == NULL && ! textp)
+    return NULL;
+
+  size_t fname_len = fname != NULL ? strlen (fname) : 0;
+
+  /* Create the file descriptor.  We do not generate the output file
+     right away.  Instead we create a temporary file in the same
+     directory which, if everything goes alright, will replace a
+     possibly existing file with the given name.  */
+  AsmCtx_t *result
+    = (AsmCtx_t *) malloc (sizeof (AsmCtx_t) + 2 * fname_len + 9);
+  if (result == NULL)
+    return NULL;
+
+      /* Initialize the lock.  */
+      rwlock_init (result->lock);
+
+  if (fname != NULL)
+    {
+      /* Create the name of the temporary file.  */
+      result->fname = stpcpy (mempcpy (result->tmp_fname, fname, fname_len),
+			      ".XXXXXX") + 1;
+      memcpy (result->fname, fname, fname_len + 1);
+
+      /* Create the temporary file.  */
+      result->fd = mkstemp (result->tmp_fname);
+      if (result->fd == -1)
+	{
+	  int save_errno = errno;
+	  free (result);
+	  __libasm_seterrno (ASM_E_CANNOT_CREATE);
+	  errno = save_errno;
+	  return NULL;
+	}
+    }
+  else
+    result->fd = -1;
+
+  /* Initialize the counter for temporary symbols.  */
+  result->tempsym_count = 0;
+
+  /* Now we differentiate between textual and binary output.   */
+  result->textp = textp;
+  if (textp)
+    result = prepare_text_output (result);
+  else
+    result = prepare_binary_output (result, ebl);
+
+  return result;
+}