1 files changed, 151 insertions, 0 deletions
diff --git a/libasm/asm_begin.c b/libasm/asm_begin.c
new file mode 100644
index 00000000..3896f78f
--- /dev/null
+++ b/libasm/asm_begin.c
@@ -0,0 +1,151 @@
+/* Create descriptor for assembling.
+   Copyright (C) 2002 Red Hat, Inc.
+   Written by Ulrich Drepper <drepper@redhat.com>, 2002.
+
+   This program is Open Source software; you can redistribute it and/or
+   modify it under the terms of the Open Software License version 1.0 as
+   published by the Open Source Initiative.
+
+   You should have received a copy of the Open Software License along
+   with this program; if not, you may obtain a copy of the Open Software
+   License version 1.0 from http://www.opensource.org/licenses/osl.php or
+   by writing the Open Source Initiative c/o Lawrence Rosen, Esq.,
+   3001 King Ranch Road, Ukiah, CA 95482.   */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <assert.h>
+#include <errno.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)
+{
+  return result;
+}
+
+
+static AsmCtx_t *
+prepare_binary_output (AsmCtx_t *result, int machine, int klass, int data)
+{
+  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.  */
+  if (gelf_newehdr (result->out.elf, klass) == 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 value the user provided.  */
+  ehdr->e_machine = machine;
+  /* Same for the class and endianness.  */
+  ehdr->e_ident[EI_CLASS] = klass;
+  ehdr->e_ident[EI_DATA] = data;
+
+  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, textp, machine, klass, data)
+     const char *fname;
+     bool textp;
+     int machine;
+     int klass;
+     int data;
+{
+  size_t fname_len = strlen (fname);
+  AsmCtx_t *result;
+
+
+  /* First order of business: find the appropriate backend.  If it
+     does not exist we don't have to look further.  */
+  // XXX
+
+  /* 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.  */
+  result = (AsmCtx_t *) malloc (sizeof (AsmCtx_t) + 2 * fname_len + 9);
+  if (result == NULL)
+    return NULL;
+
+  /* Initialize the lock.  */
+  rwlock_init (result->lock);
+
+  /* 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;
+    }
+
+  /* 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, machine, klass, data);
+
+  return result;
+}