commit 67a1b68263d58a3ed5ce024468606044a1561312
author Olaf Hering <olh@suse.de> Fri Oct 28 17:46:49 2005 -0700
committer Paul Mackerras <paulus@samba.org> Sat Oct 29 15:11:00 2005 +1000
tree 0e997ea83aa27cb2ceb622549acc8e47aefa6bb2
parent a4497235f00d811943831c9d76995d36c4ffab2d

[PATCH] ppc64 boot: proof that reloc works

To prove that the relocation works, move the crt0.o away from the beginning.
Move linker options from command line into linker script.  rename entry point
because '_start' is referenced in printf output.

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

diff --git a/arch/ppc64/boot/Makefile b/arch/ppc64/boot/Makefile
index 9e19351..301bc15 100644
--- a/arch/ppc64/boot/Makefile
+++ b/arch/ppc64/boot/Makefile
@@ -24,7 +24,7 @@
 HOSTCC		:= gcc
 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
+BOOTLFLAGS	:= -T $(srctree)/$(src)/zImage.lds
 OBJCOPYFLAGS    := contents,alloc,load,readonly,data
 
 zlib       := infblock.c infcodes.c inffast.c inflate.c inftrees.c infutil.c
@@ -34,7 +34,7 @@
 $(addprefix $(obj)/,$(zlib) main.o): $(addprefix $(obj)/,$(zliblinuxheader)) $(addprefix $(obj)/,$(zlibheader))
 #$(addprefix $(obj)/,main.o): $(addprefix $(obj)/,zlib.h)
 
-src-boot := crt0.S string.S prom.c main.c div64.S
+src-boot := string.S prom.c main.c div64.S crt0.S
 src-boot += $(zlib)
 src-boot := $(addprefix $(obj)/, $(src-boot))
 obj-boot := $(addsuffix .o, $(basename $(src-boot)))

arch/ppc64/boot/crt0.S

diff --git a/arch/ppc64/boot/crt0.S b/arch/ppc64/boot/crt0.S
index 5788a45..8bfdeaf 100644
--- a/arch/ppc64/boot/crt0.S
+++ b/arch/ppc64/boot/crt0.S
@@ -12,8 +12,8 @@
 #include "ppc_asm.h"
 
 	.text
-	.globl	_start
-_start:
+	.globl	_zimage_start
+_zimage_start:
 	bl	reloc_offset
 
 reloc_offset:

arch/ppc64/boot/zImage.lds

diff --git a/arch/ppc64/boot/zImage.lds b/arch/ppc64/boot/zImage.lds
index 79d62c7..4b6bb3f 100644
--- a/arch/ppc64/boot/zImage.lds
+++ b/arch/ppc64/boot/zImage.lds
@@ -1,6 +1,9 @@
 OUTPUT_ARCH(powerpc:common)
+ENTRY(_zimage_start)
 SECTIONS
 {
+  . = (4*1024*1024);
+  _start = .;
   .text      :
   {
     *(.text)