[U-Boot] [PATCH 33/48] x86: Add relocation and link script for a 64-bit EFI application

[Simon Glass]

Add a link script and relocation code for building 64-bit EFI applications.
This can be used for the EFI stub.

Signed-off-by: Simon Glass <sjg at chromium.org>
---

 arch/x86/cpu/efi/elf_x86_64_efi.lds | 87 +++++++++++++++++++++++++++++++++++
 arch/x86/lib/reloc_x86_64.c         | 90 +++++++++++++++++++++++++++++++++++++
 2 files changed, 177 insertions(+)
 create mode 100644 arch/x86/cpu/efi/elf_x86_64_efi.lds
 create mode 100644 arch/x86/lib/reloc_x86_64.c

diff --git a/arch/x86/cpu/efi/elf_x86_64_efi.lds b/arch/x86/cpu/efi/elf_x86_64_efi.lds
new file mode 100644
index 0000000..369f146
--- /dev/null
+++ b/arch/x86/cpu/efi/elf_x86_64_efi.lds
@@ -0,0 +1,87 @@
+/*
+ * U-Boot EFI link script
+ *
+ * SPDX-License-Identifier:	bsd-2-clause
+ *
+ * Modified from usr/lib32/elf_ia32_efi.lds in gnu-efi
+ */
+
+#include <config.h>
+
+OUTPUT_FORMAT("elf64-x86-64", "elf64-x86-64", "elf64-x86-64")
+OUTPUT_ARCH(i386:x86-64)
+ENTRY(_start)
+SECTIONS
+{
+	. = 0x0;
+	ImageBase = .;
+	.hash : { *(.hash) }	/* this MUST come first! */
+	. = ALIGN(4096);
+	.eh_frame : {
+		*(.eh_frame)
+	}
+
+	. = ALIGN(4096);
+
+	.text : {
+		*(.text)
+		*(.text.*)
+		*(.gnu.linkonce.t.*)
+	}
+
+	. = ALIGN(4096);
+
+	.reloc : {
+		*(.reloc)
+	}
+
+	. = ALIGN(4096);
+
+	.data : {
+		*(.rodata*)
+		*(.got.plt)
+		*(.got)
+		*(.data*)
+		*(.sdata)
+		/* the EFI loader doesn't seem to like a .bss section, so we stick
+		 * it all into .data: */
+		*(.sbss)
+		*(.scommon)
+		*(.dynbss)
+		*(.bss)
+		*(COMMON)
+		*(.rel.local)
+
+		/* U-Boot lists and device tree */
+		. = ALIGN(8);
+		KEEP(*(SORT(.u_boot_list*)));
+		. = ALIGN(8);
+		KEEP(*(.dtb*));
+		/* Keep U-Boot payload */
+		. = ALIGN(8);
+		KEEP(*(.u_boot_bin.*));
+	}
+
+	. = ALIGN(4096);
+	.dynamic : { *(.dynamic) }
+	. = ALIGN(4096);
+
+	.rela : {
+		*(.rela.data*)
+		*(.rela.got)
+		*(.rela.stab)
+	}
+
+	. = ALIGN(4096);
+	.dynsym : { *(.dynsym) }
+	. = ALIGN(4096);
+	.dynstr : { *(.dynstr) }
+	. = ALIGN(4096);
+	.ignored.reloc : {
+		*(.rela.reloc)
+		*(.eh_frame)
+		*(.note.GNU-stack)
+	}
+
+	.comment 0 : { *(.comment) }
+}
diff --git a/arch/x86/lib/reloc_x86_64.c b/arch/x86/lib/reloc_x86_64.c
new file mode 100644
index 0000000..70a2b2a
--- /dev/null
+++ b/arch/x86/lib/reloc_x86_64.c
@@ -0,0 +1,90 @@
+/* reloc_x86_64.c - position independent x86_64 ELF shared object relocator
+   Copyright (C) 1999 Hewlett-Packard Co.
+	Contributed by David Mosberger <davidm at hpl.hp.com>.
+   Copyright (C) 2005 Intel Co.
+	Contributed by Fenghua Yu <fenghua.yu at intel.com>.
+
+    All rights reserved.
+
+    Redistribution and use in source and binary forms, with or without
+    modification, are permitted provided that the following conditions
+    are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+    * 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.
+    * Neither the name of Hewlett-Packard Co. 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 ANYDIRECT, 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.
+*/
+
+#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;
+	struct 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 = (struct 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 = (struct elf64_rel *)((char *)rel + relent);
+		relsz -= relent;
+	}
+	return EFI_SUCCESS;
+}
-- 
2.4.3.573.g4eafbef