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authorOlaf Hering <olh@suse.de>2005-10-29 04:46:48 +0400
committerPaul Mackerras <paulus@samba.org>2005-10-29 09:10:12 +0400
commita4497235f00d811943831c9d76995d36c4ffab2d (patch)
tree7731fe28f9b5b98a94f9182766a20eb862e6f5cf /arch/ppc64/boot/crt0.S
parentafbe8c4bb0155f533d6e57edd269c93e2f23c2fa (diff)
downloadlinux-a4497235f00d811943831c9d76995d36c4ffab2d.tar.xz
[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>
Diffstat (limited to 'arch/ppc64/boot/crt0.S')
-rw-r--r--arch/ppc64/boot/crt0.S29
1 files changed, 29 insertions, 0 deletions
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