Add x86 ELF support

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5258 42af7a65-404d-4744-a932-0658087f49c3

1 files changed, 139 insertions, 0 deletions

diff --git a/nuttx/arch/x86/src/common/up_elf.c b/nuttx/arch/x86/src/common/up_elf.c
new file mode 100644
index 000000000..f159c8e51
--- /dev/null
+++ b/nuttx/arch/x86/src/common/up_elf.c
@@ -0,0 +1,139 @@
+/****************************************************************************
+ * arch/x86/src/up_elf.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 <stdlib.h>
+#include <errno.h>
+
+#include <nuttx/arch.h>
+#include <nuttx/binfmt/elf.h>
+
+#include "up_internal.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+#define R_386_32        1
+#define R_386_PC32      2
+
+#define ELF_BITS        32
+#define ELF_ARCH        EM_386
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: arch_checkarch
+ *
+ * Description:
+ *   Given the ELF header in 'hdr', verify that the ELF file is appropriate
+ *   for the current, configured architecture.  Every architecture that uses
+ *   the ELF loader must provide this function.
+ *
+ * Input Parameters:
+ *   hdr - The ELF header read from the ELF file.
+ *
+ * Returned Value:
+ *   True if the architecture supports this ELF file.
+ *
+ ****************************************************************************/
+
+bool arch_checkarch(FAR const Elf32_Ehdr *hdr)
+{
+  return hdr->e_machine == EM_386 || hdr->e_machine == EM_486;
+}
+
+/****************************************************************************
+ * Name: arch_relocate and arch_relocateadd
+ *
+ * Description:
+ *   Perform on architecture-specific ELF relocation.  Every architecture
+ *   that uses the ELF loader must provide this function.
+ *
+ * Input Parameters:
+ *   rel - The relocation type
+ *   sym - The ELF symbol structure containing the fully resolved value.
+ *   addr - The address that requires the relocation.
+ *
+ * Returned Value:
+ *   Zero (OK) if the relocation was successful.  Otherwise, a negated errno
+ *   value indicating the cause of the relocation failure.
+ *
+ ****************************************************************************/
+
+int arch_relocate(FAR const Elf32_Rel *rel, FAR const Elf32_Sym *sym,
+                  uintptr_t addr)
+{
+  FAR uint32_t *ptr = (FAR uint32_t *)addr;
+
+  switch (ELF_REL_TYPE(rel->r_info))
+    {
+     case R_386_32:
+       *ptr += sym->st_value;
+       break;
+
+     case R_386_PC32:
+       *ptr += sym->st_value - (uint32_t)ptr;
+       break;
+
+     default:
+        return -EINVAL;
+    }
+
+  return OK;
+}
+
+int arch_relocateadd(FAR const Elf32_Rela *rel, FAR const Elf32_Sym *sym,
+                     uintptr_t addr)
+{
+  bdbg("Not supported\n");
+  return -ENOSYS;
+}
+