Add framework to support loadable ELF modules (not much logic in place yet)

git-svn-id: http://svn.code.sf.net/p/nuttx/code/trunk@5250 42af7a65-404d-4744-a932-0658087f49c3
2026-10-31 18:31:36 +08:00 · 2012-10-24 16:46:12 +00:00
parent d300539524
commit 1bd66e95f8
35 changed files with 1802 additions and 651 deletions
@@ -0,0 +1,165 @@
+/****************************************************************************
+ * binfmt/libelf/libelf_read.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/types.h>
+#include <stdint.h>
+#include <unistd.h>
+#include <string.h>
+#include <elf.h>
+#include <debug.h>
+#include <errno.h>
+
+#include <arpa/inet.h>
+#include <nuttx/elf.h>
+
+/****************************************************************************
+ * Pre-Processor Definitions
+ ****************************************************************************/
+
+#undef ELF_DUMP_READDATA       /* Define to dump all file data read */
+#define DUMPER lib_rawprintf   /* If ELF_DUMP_READDATA is defined, this
+                                * is the API used to dump data */
+
+/****************************************************************************
+ * Private Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: elf_dumpreaddata
+ ****************************************************************************/
+
+#if defined(ELF_DUMP_READDATA)
+static inline void elf_dumpreaddata(char *buffer, int buflen)
+{
+  uint32_t *buf32 = (uint32_t*)buffer;
+  int i;
+  int j;
+
+  for (i = 0; i < buflen; i += 32)
+    {
+      DUMPER("%04x:", i);
+      for (j = 0; j < 32; j += sizeof(uint32_t))
+        {
+          DUMPER("  %08x", *buf32++);
+        }
+      DUMPER("\n");
+    }
+}
+#else
+#  define elf_dumpreaddata(b,n)
+#endif
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: elf_read
+ *
+ * Description:
+ *   Read 'readsize' bytes from the object file at 'offset'
+ *
+ * Returned Value:
+ *   0 (OK) is returned on success and a negated errno is returned on
+ *   failure.
+ *
+ ****************************************************************************/
+
+int elf_read(struct elf_loadinfo_s *loadinfo, char *buffer, int readsize, int offset)
+{
+  ssize_t nbytes;      /* Number of bytes read */
+  off_t   rpos;        /* Position returned by lseek */
+  char   *bufptr;      /* Next buffer location to read into */
+  int     bytesleft;   /* Number of bytes of .data left to read */
+  int     bytesread;   /* Total number of bytes read */
+
+  bvdbg("Read %d bytes from offset %d\n", readsize, offset);
+
+  /* Seek to the position in the object file where the initialized
+   * data is saved.
+   */
+
+  bytesread = 0;
+  bufptr    = buffer;
+  bytesleft = readsize;
+  do
+    {
+      rpos = lseek(loadinfo->filfd, offset, SEEK_SET);
+      if (rpos != offset)
+        {
+          bdbg("Failed to seek to position %d: %d\n", offset, errno);
+          return -errno;
+        }
+
+      /* Read the file data at offset into the user buffer */
+
+       nbytes = read(loadinfo->filfd, bufptr, bytesleft);
+       if (nbytes < 0)
+         {
+           if (errno != EINTR)
+             {
+               bdbg("Read of .data failed: %d\n", errno);
+               return -errno;
+             }
+         }
+       else if (nbytes == 0)
+         {
+           bdbg("Unexpected end of file\n");
+           return -ENODATA;
+         }
+       else
+         {
+           bytesread += nbytes;
+           bytesleft -= nbytes;
+           bufptr    += nbytes;
+           offset    += nbytes;
+         }
+    }
+  while (bytesread < readsize);
+
+  elf_dumpreaddata(buffer, readsize);
+  return OK;
+}
+