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-rw-r--r--arch/ppc64/boot/crt0.S53
1 files changed, 32 insertions, 21 deletions
diff --git a/arch/ppc64/boot/crt0.S b/arch/ppc64/boot/crt0.S
index 3861e7f9cf1..9cc44226393 100644
--- a/arch/ppc64/boot/crt0.S
+++ b/arch/ppc64/boot/crt0.S
@@ -12,11 +12,40 @@
#include "ppc_asm.h"
.text
- .globl _start
-_start:
+ .globl _zimage_start
+_zimage_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
@@ -25,24 +54,6 @@ _start:
sync
isync
- ## Clear out the BSS as per ANSI C requirements
-
- lis r7,_end@ha
- addi r7,r7,_end@l # r7 = &_end
- lis r8,__bss_start@ha #
- addi r8,r8,__bss_start@l # r8 = &_bss_start
-
- ## Determine how large an area, in number of words, to clear
-
- subf r7,r8,r7 # r7 = &_end - &_bss_start + 1
- addi r7,r7,3 # r7 += 3
- srwi. r7,r7,2 # r7 = size in words.
- beq 3f # If the size is zero, don't bother
- addi r8,r8,-4 # r8 -= 4
- mtctr r7 # SPRN_CTR = number of words to clear
- li r0,0 # r0 = 0
-2: stwu r0,4(r8) # Clear out a word
- bdnz 2b # Keep clearing until done
-3:
+ mr r6,r1
b start