From a4497235f00d811943831c9d76995d36c4ffab2d Mon Sep 17 00:00:00 2001
From: Olaf Hering <olh@suse.de>
Date: Fri, 28 Oct 2005 17:46:48 -0700
Subject: [PATCH] [PATCH] ppc64 boot: make the zImage relocateable

Make the zImage relocateable.  So yaboot could just load and run any ELF
binary, without worrying about its load address.

Signed-off-by: Olaf Hering <olh@suse.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Anton Blanchard <anton@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
---
 arch/ppc64/boot/Makefile   |  2 +-
 arch/ppc64/boot/crt0.S     | 29 +++++++++++++++++++++++++++++
 arch/ppc64/boot/zImage.lds |  4 +++-
 3 files changed, 33 insertions(+), 2 deletions(-)

diff --git a/arch/ppc64/boot/Makefile b/arch/ppc64/boot/Makefile
index f8f35999e1a6..9e19351f3dfa 100644
--- a/arch/ppc64/boot/Makefile
+++ b/arch/ppc64/boot/Makefile
@@ -22,7 +22,7 @@
 
 
 HOSTCC		:= gcc
-BOOTCFLAGS	:= $(HOSTCFLAGS) -fno-builtin -nostdinc -isystem $(shell $(CROSS32CC) -print-file-name=include)
+BOOTCFLAGS	:= $(HOSTCFLAGS) -fno-builtin -nostdinc -isystem $(shell $(CROSS32CC) -print-file-name=include) -fPIC
 BOOTAFLAGS	:= -D__ASSEMBLY__ $(BOOTCFLAGS) -traditional -nostdinc
 BOOTLFLAGS	:= -Ttext 0x00400000 -e _start -T $(srctree)/$(src)/zImage.lds
 OBJCOPYFLAGS    := contents,alloc,load,readonly,data
diff --git a/arch/ppc64/boot/crt0.S b/arch/ppc64/boot/crt0.S
index da6618a865c9..5788a453a7a2 100644
--- a/arch/ppc64/boot/crt0.S
+++ b/arch/ppc64/boot/crt0.S
@@ -14,9 +14,38 @@
 	.text
 	.globl	_start
 _start:
+	bl	reloc_offset
+
+reloc_offset:
+	mflr	r0
+	lis	r9,reloc_offset@ha
+	addi	r9,r9,reloc_offset@l
+	subf.	r0,r9,r0
+	beq	clear_caches
+
+reloc_got2:
+	lis	r9,__got2_start@ha
+	addi	r9,r9,__got2_start@l
+	lis	r8,__got2_end@ha
+	addi	r8,r8,__got2_end@l
+	subf.	r8,r9,r8
+	beq	clear_caches
+	srwi.	r8,r8,2
+	mtctr	r8
+	add	r9,r0,r9
+reloc_got2_loop:
+	lwz	r8,0(r9)
+	add	r8,r8,r0
+	stw	r8,0(r9)
+	addi	r9,r9,4
+	bdnz	reloc_got2_loop
+
+clear_caches:
 	lis	r9,_start@h
+	add	r9,r0,r9
 	lis	r8,_etext@ha
 	addi	r8,r8,_etext@l
+	add	r8,r0,r8
 1:	dcbf	r0,r9
 	icbi	r0,r9
 	addi	r9,r9,0x20
diff --git a/arch/ppc64/boot/zImage.lds b/arch/ppc64/boot/zImage.lds
index fb465a4d89b5..79d62c733ec0 100644
--- a/arch/ppc64/boot/zImage.lds
+++ b/arch/ppc64/boot/zImage.lds
@@ -13,7 +13,9 @@ SECTIONS
     *(.rodata*)
     *(.data*)
     *(.sdata*)
-    *(.got*)
+    __got2_start = .;
+    *(.got2)
+    __got2_end = .;
   }
 
   . = ALIGN(4096);