x86: Add relocation and link script for a 64-bit EFI application

[karo-tx-uboot.git] / arch / x86 / lib / efi / reloc_x86_64.c

diff --git a/arch/x86/lib/efi/reloc_x86_64.c b/arch/x86/lib/efi/reloc_x86_64.c
new file mode 100644 (file)
index 0000000..5f71f2a
--- /dev/null
+++ b/arch/x86/lib/efi/reloc_x86_64.c
@@ -0,0 +1,66 @@
+/*
+ * reloc_x86_64.c - position independent x86_64 ELF shared object relocator
+ * Copyright (C) 1999 Hewlett-Packard Co.
+ * Contributed by David Mosberger <davidm@hpl.hp.com>.
+ * Copyright (C) 2005 Intel Co.
+ * Contributed by Fenghua Yu <fenghua.yu@intel.com>.
+ *
+ * All rights reserved.
+ *
+ * SPDX-License-Identifier:    BSD-3-Clause
+ */
+
+#include <common.h>
+#include <efi.h>
+#include <elf.h>
+#include <asm/elf.h>
+
+efi_status_t _relocate(long ldbase, Elf64_Dyn *dyn, efi_handle_t image,
+                      struct efi_system_table *systab)
+{
+       long relsz = 0, relent = 0;
+       Elf64_Rel *rel = 0;
+       unsigned long *addr;
+       int i;
+
+       for (i = 0; dyn[i].d_tag != DT_NULL; ++i) {
+               switch (dyn[i].d_tag) {
+               case DT_RELA:
+                       rel = (Elf64_Rel *)
+                               ((unsigned long)dyn[i].d_un.d_ptr + ldbase);
+                       break;
+               case DT_RELASZ:
+                       relsz = dyn[i].d_un.d_val;
+                       break;
+               case DT_RELAENT:
+                       relent = dyn[i].d_un.d_val;
+                       break;
+               default:
+                       break;
+               }
+       }
+
+       if (!rel && relent == 0)
+               return EFI_SUCCESS;
+
+       if (!rel || relent == 0)
+               return EFI_LOAD_ERROR;
+
+       while (relsz > 0) {
+               /* apply the relocs */
+               switch (ELF64_R_TYPE(rel->r_info)) {
+               case R_X86_64_NONE:
+                       break;
+               case R_X86_64_RELATIVE:
+                       addr = (unsigned long *)(ldbase + rel->r_offset);
+                       *addr += ldbase;
+                       break;
+               default:
+                       break;
+               }
+               rel = (Elf64_Rel *)((char *)rel + relent);
+               relsz -= relent;
+       }
+
+       return EFI_SUCCESS;
+}