1 files changed, 288 insertions, 0 deletions
diff --git a/nuttx/binfmt/libelf/libelf_load.c b/nuttx/binfmt/libelf/libelf_load.c
new file mode 100644
index 000000000..0e4ad9798
--- /dev/null
+++ b/nuttx/binfmt/libelf/libelf_load.c
@@ -0,0 +1,288 @@
+/****************************************************************************
+ * binfmt/libelf/libelf_load.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 <stdlib.h>
+#include <unistd.h>
+#include <elf32.h>
+#include <assert.h>
+#include <errno.h>
+#include <debug.h>
+
+#include <nuttx/binfmt/elf.h>
+
+#include "libelf.h"
+
+/****************************************************************************
+ * Pre-Processor Definitions
+ ****************************************************************************/
+
+#define ELF_ALIGN_MASK   ((1 << CONFIG_ELF_ALIGN_LOG2) - 1)
+#define ELF_ALIGNUP(a)   (((unsigned long)(a) + ELF_ALIGN_MASK) & ~ELF_ALIGN_MASK)
+#define ELF_ALIGNDOWN(a) ((unsigned long)(a) & ~ELF_ALIGN_MASK)
+
+
+#ifndef MAX
+#define MAX(x,y) ((x) > (y) ? (x) : (y))
+#endif
+
+/****************************************************************************
+ * Private Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: elf_elfsize
+ *
+ * Description:
+ *   Calculate total memory allocation for the ELF file.
+ *
+ * Returned Value:
+ *   0 (OK) is returned on success and a negated errno is returned on
+ *   failure.
+ *
+ ****************************************************************************/
+
+static void elf_elfsize(struct elf_loadinfo_s *loadinfo)
+{
+  size_t elfsize;
+  int i;
+
+  /* Accumulate the size each section into memory that is marked SHF_ALLOC */
+
+  elfsize = 0;
+  for (i = 0; i < loadinfo->ehdr.e_shnum; i++)
+    {
+      FAR Elf32_Shdr *shdr = &loadinfo->shdr[i];
+
+      /* SHF_ALLOC indicates that the section requires memory during
+       * execution.
+       */
+
+      if ((shdr->sh_flags & SHF_ALLOC) != 0)
+        {
+          elfsize += ELF_ALIGNUP(shdr->sh_size);
+        }
+    }
+
+  /* Save the allocation size */
+
+  loadinfo->elfsize = elfsize;
+}
+
+/****************************************************************************
+ * Name: elf_loadfile
+ *
+ * Description:
+ *   Allocate memory for the file and read the section data into the
+ *   allocated memory.  Section addresses in the shdr[] are updated to point
+ *   to the corresponding position in the allocated memory.
+ *
+ * Returned Value:
+ *   0 (OK) is returned on success and a negated errno is returned on
+ *   failure.
+ *
+ ****************************************************************************/
+
+static inline int elf_loadfile(FAR struct elf_loadinfo_s *loadinfo)
+{
+  FAR uint8_t *dest;
+  int ret;
+  int i;
+
+  /* Allocate (and zero) memory for the ELF file. */
+
+  ret = elf_addrenv_alloc(loadinfo, loadinfo->elfsize);
+  if (ret < 0)
+    {
+      bdbg("ERROR: elf_addrenv_alloc() failed: %d\n", ret);
+      return ret;
+    }
+
+  /* Read each section into memory that is marked SHF_ALLOC + SHT_NOBITS */
+
+  bvdbg("Loaded sections:\n");
+  dest = (FAR uint8_t*)loadinfo->elfalloc;
+
+  for (i = 0; i < loadinfo->ehdr.e_shnum; i++)
+    {
+      FAR Elf32_Shdr *shdr = &loadinfo->shdr[i];
+
+      /* SHF_ALLOC indicates that the section requires memory during
+       * execution */
+
+      if ((shdr->sh_flags & SHF_ALLOC) == 0)
+        {
+          continue;
+        }
+
+      /* SHT_NOBITS indicates that there is no data in the file for the
+       * section.
+       */
+
+      if (shdr->sh_type != SHT_NOBITS)
+        {
+          /* If CONFIG_ADDRENV=y, then 'dest' lies in a virtual address space
+           * that may not be in place now.  elf_addrenv_select() will
+           * temporarily instantiate that address space.
+           */
+
+#ifdef CONFIG_ADDRENV
+          ret = elf_addrenv_select(loadinfo);
+          if (ret < 0)
+            {
+              bdbg("ERROR: elf_addrenv_select() failed: %d\n", ret);
+              return ret;
+            }
+#endif
+
+          /* Read the section data from sh_offset to dest */
+
+          ret = elf_read(loadinfo, dest, shdr->sh_size, shdr->sh_offset);
+          if (ret < 0)
+            {
+              bdbg("Failed to read section %d: %d\n", i, ret);
+              return ret;
+            }
+
+          /* Restore the original address environment */
+
+#ifdef CONFIG_ADDRENV
+          ret = elf_addrenv_restore(loadinfo);
+          if (ret < 0)
+            {
+              bdbg("ERROR: elf_addrenv_restore() failed: %d\n", ret);
+             return ret;
+            }
+#endif
+        }
+
+      /* Update sh_addr to point to copy in memory */
+
+      bvdbg("%d. %08x->%08x\n", i, (long)shdr->sh_addr, (long)dest);
+      shdr->sh_addr = (uintptr_t)dest;
+
+      /* Setup the memory pointer for the next time through the loop */
+
+      dest += ELF_ALIGNUP(shdr->sh_size);
+    }
+
+  return OK;
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: elf_load
+ *
+ * Description:
+ *   Loads the binary into memory, allocating memory, performing relocations
+ *   and inializing the data and bss segments.
+ *
+ * Returned Value:
+ *   0 (OK) is returned on success and a negated errno is returned on
+ *   failure.
+ *
+ ****************************************************************************/
+
+int elf_load(FAR struct elf_loadinfo_s *loadinfo)
+{
+  int ret;
+
+  bvdbg("loadinfo: %p\n", loadinfo);
+  DEBUGASSERT(loadinfo && loadinfo->filfd >= 0);
+
+  /* Load section headers into memory */
+
+  ret = elf_loadshdrs(loadinfo);
+  if (ret < 0)
+    {
+      bdbg("elf_loadshdrs failed: %d\n", ret);
+      goto errout_with_buffers;
+    }
+
+  /* Determine total size to allocate */
+
+  elf_elfsize(loadinfo);
+
+  /* Allocate memory and load sections into memory */
+
+  ret = elf_loadfile(loadinfo);
+  if (ret < 0)
+    {
+      bdbg("elf_loadfile failed: %d\n", ret);
+      goto errout_with_buffers;
+    }
+
+  /* Load static constructors and destructors. */
+
+#ifdef CONFIG_BINFMT_CONSTRUCTORS
+  ret = elf_loadctors(loadinfo);
+  if (ret < 0)
+    {
+      bdbg("elf_loadctors failed: %d\n", ret);
+      goto errout_with_buffers;
+    }
+
+  ret = elf_loaddtors(loadinfo);
+  if (ret < 0)
+    {
+      bdbg("elf_loaddtors failed: %d\n", ret);
+      goto errout_with_buffers;
+    }
+#endif
+
+  return OK;
+
+  /* Error exits */
+
+errout_with_buffers:
+  elf_unload(loadinfo);
+  return ret;
+}
+