diff options
Diffstat (limited to 'arch/ppc64/boot/crt0.S')
| -rw-r--r-- | arch/ppc64/boot/crt0.S | 55 |
1 files changed, 33 insertions, 22 deletions
diff --git a/arch/ppc64/boot/crt0.S b/arch/ppc64/boot/crt0.S index 04d3e74cd72f..9cc442263939 100644 --- a/arch/ppc64/boot/crt0.S +++ b/arch/ppc64/boot/crt0.S @@ -9,14 +9,43 @@ * NOTE: this code runs in 32 bit mode and is packaged as ELF32. */ -#include <asm/ppc_asm.h> +#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 |