1 files changed, 202 insertions, 0 deletions
diff --git a/nuttx/binfmt/libelf/libelf_init.c b/nuttx/binfmt/libelf/libelf_init.c
new file mode 100644
index 000000000..fa4b7983c
--- /dev/null
+++ b/nuttx/binfmt/libelf/libelf_init.c
@@ -0,0 +1,202 @@
+/****************************************************************************
+ * binfmt/libelf/libelf_init.c
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/stat.h>
+
+#include <stdint.h>
+#include <string.h>
+#include <fcntl.h>
+#include <elf32.h>
+#include <debug.h>
+#include <errno.h>
+
+#include <nuttx/binfmt/elf.h>
+
+#include "libelf.h"
+
+/****************************************************************************
+ * Pre-Processor Definitions
+ ****************************************************************************/
+
+/* CONFIG_DEBUG, CONFIG_DEBUG_VERBOSE, and CONFIG_DEBUG_BINFMT have to be
+ * defined or CONFIG_ELF_DUMPBUFFER does nothing.
+ */
+
+#if !defined(CONFIG_DEBUG_VERBOSE) || !defined (CONFIG_DEBUG_BINFMT)
+#  undef CONFIG_ELF_DUMPBUFFER
+#endif
+
+#ifdef CONFIG_ELF_DUMPBUFFER
+# define elf_dumpbuffer(m,b,n) bvdbgdumpbuffer(m,b,n)
+#else
+# define elf_dumpbuffer(m,b,n)
+#endif
+
+/****************************************************************************
+ * Private Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: elf_filelen
+ *
+ * Description:
+ *  Get the size of the ELF file
+ *
+ * Returned Value:
+ *   0 (OK) is returned on success and a negated errno is returned on
+ *   failure.
+ *
+ ****************************************************************************/
+
+static inline int elf_filelen(FAR struct elf_loadinfo_s *loadinfo,
+                              FAR const char *filename)
+{
+  struct stat buf;
+  int ret;
+
+  /* Get the file stats */
+
+  ret = stat(filename, &buf);
+  if (ret < 0)
+    {
+      int errval = errno;
+      bdbg("Failed to fstat file: %d\n", errval);
+      return -errval;
+    }
+
+  /* Verify that it is a regular file */
+
+  if (!S_ISREG(buf.st_mode))
+    {
+      bdbg("Not a regular file.  mode: %d\n", buf.st_mode);
+      return -ENOENT;
+    }
+
+  /* TODO:  Verify that the file is readable.  Not really important because
+   * we will detect this when we try to open the file read-only.
+   */
+
+  /* Return the size of the file in the loadinfo structure */
+
+  loadinfo->filelen = buf.st_size;
+  return OK;
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: elf_init
+ *
+ * Description:
+ *   This function is called to configure the library to process an ELF
+ *   program binary.
+ *
+ * Returned Value:
+ *   0 (OK) is returned on success and a negated errno is returned on
+ *   failure.
+ *
+ ****************************************************************************/
+
+int elf_init(FAR const char *filename, FAR struct elf_loadinfo_s *loadinfo)
+{
+  int ret;
+
+  bvdbg("filename: %s loadinfo: %p\n", filename, loadinfo);
+
+  /* Clear the load info structure */
+
+  memset(loadinfo, 0, sizeof(struct elf_loadinfo_s));
+
+  /* Get the length of the file. */
+
+  ret = elf_filelen(loadinfo, filename);
+  if (ret < 0)
+    {
+      bdbg("elf_filelen failed: %d\n", ret);
+      return ret;
+    }
+
+  /* Open the binary file for reading (only) */
+
+  loadinfo->filfd = open(filename, O_RDONLY);
+  if (loadinfo->filfd < 0)
+    {
+      int errval = errno;
+      bdbg("Failed to open ELF binary %s: %d\n", filename, errval);
+      return -errval;      
+    }
+
+  /* Read the ELF ehdr from offset 0 */
+
+  ret = elf_read(loadinfo, (FAR uint8_t*)&loadinfo->ehdr, sizeof(Elf32_Ehdr), 0);
+  if (ret < 0)
+    {
+      bdbg("Failed to read ELF header: %d\n", ret);
+      return ret;
+    }
+
+  elf_dumpbuffer("ELF header", (FAR const uint8_t*)&loadinfo->ehdr, sizeof(Elf32_Ehdr));
+
+  /* Verify the ELF header */
+
+  ret = elf_verifyheader(&loadinfo->ehdr);
+  if (ret <0)
+    {
+      /* This may not be an error because we will be called to attempt loading
+       * EVERY binary.  If elf_verifyheader() does not recognize the ELF header,
+       * it will -ENOEXEC whcih simply informs the system that the file is not an
+       * ELF file.  elf_verifyheader() will return other errors if the ELF header
+       * is not correctly formed.
+       */
+
+      bdbg("Bad ELF header: %d\n", ret);
+      return ret;
+    }
+
+  return OK;
+}
+