1 files changed, 176 insertions, 0 deletions
diff --git a/nuttx/binfmt/libelf/libelf_addrenv.c b/nuttx/binfmt/libelf/libelf_addrenv.c
new file mode 100644
index 000000000..193062a54
--- /dev/null
+++ b/nuttx/binfmt/libelf/libelf_addrenv.c
@@ -0,0 +1,176 @@
+/****************************************************************************
+ * binfmt/libelf/libelf_addrenv.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 <errno.h>
+#include <debug.h>
+
+#include <nuttx/arch.h>
+#include <nuttx/kmalloc.h>
+
+#include "libelf.h"
+
+/****************************************************************************
+ * Pre-Processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: elf_addrenv_alloc
+ *
+ * Description:
+ *   Allocate memory for the ELF image (elfalloc). If CONFIG_ADDRENV=n,
+ *   elfalloc will be allocated using kzalloc().  If CONFIG_ADDRENV-y, then
+ *   elfalloc will be allocated using up_addrenv_create().  In either case,
+ *   there will be a unique instance of elfalloc (and stack) for each
+ *   instance of a process.
+ *
+ * Input Parameters:
+ *   loadinfo - Load state information
+ *   envsize - The size (in bytes) of the address environment needed for the
+ *     ELF image.
+ *
+ * Returned Value:
+ *   Zero (OK) on success; a negated errno value on failure.
+ *
+ ****************************************************************************/
+
+int elf_addrenv_alloc(FAR struct elf_loadinfo_s *loadinfo, size_t envsize)
+{
+#ifdef CONFIG_ADDRENV
+  FAR void *vaddr;
+  int ret;
+
+  /* Create an address environment for the new ELF task */
+
+  ret = up_addrenv_create(envsize, &loadinfo->addrenv);
+  if (ret < 0)
+    {
+      bdbg("ERROR: up_addrenv_create failed: %d\n", ret);
+      return ret;
+    }
+
+  /* Get the virtual address associated with the start of the address
+   * environment.  This is the base address that we will need to use to
+   * access the ELF image (but only if the address environment has been
+   * selected.
+   */
+
+  ret = up_addrenv_vaddr(loadinfo->addrenv, &vaddr);
+  if (ret < 0)
+    {
+      bdbg("ERROR: up_addrenv_vaddr failed: %d\n", ret);
+      return ret;
+    }
+
+  loadinfo->elfalloc = (uintptr_t)vaddr;
+  return OK;
+#else
+  /* Allocate memory to hold the ELF image */
+
+  loadinfo->elfalloc = (uintptr_t)kzalloc(envsize);
+  if (!loadinfo->elfalloc)
+    {
+      return -ENOMEM;
+    }
+
+  return OK;
+#endif
+}
+
+/****************************************************************************
+ * Name: elf_addrenv_free
+ *
+ * Description:
+ *   Release the address environment previously created by
+ *   elf_addrenv_create().  This function  is called only under certain error
+ *   conditions after the the module has been loaded but not yet started.
+ *   After the module has been started, the address environment will
+ *   automatically be freed when the module exits.
+ *
+ * Input Parameters:
+ *   loadinfo - Load state information
+ *
+ * Returned Value:
+ *   None.
+ *
+ ****************************************************************************/
+
+void elf_addrenv_free(FAR struct elf_loadinfo_s *loadinfo)
+{
+#ifdef CONFIG_ADDRENV
+  int ret;
+
+  /* Free the address environemnt */
+
+  ret = up_addrenv_destroy(loadinfo->addrenv);
+  if (ret < 0)
+    {
+      bdbg("ERROR: up_addrenv_destroy failed: %d\n", ret);
+    }
+
+  /* Clear out all indications of the allocated address environment */
+
+  loadinfo->elfalloc = 0;
+  loadinfo->elfsize  = 0;
+  loadinfo->addrenv  = 0;
+#else
+  /* If there is an allocation for the ELF image, free it */
+
+  if (loadinfo->elfalloc != 0)
+    {
+      kfree((FAR void *)loadinfo->elfalloc);
+      loadinfo->elfalloc = 0;
+    }
+
+   loadinfo->elfsize = 0;
+#endif
+}