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authorPaul Mackerras <paulus@samba.org>2006-01-14 15:04:06 +1100
committerPaul Mackerras <paulus@samba.org>2006-01-14 15:04:06 +1100
commit66a45dd3620ee5f913ba1af3d2dca8b9bdfa2b96 (patch)
treef98b25a1004d6e6bc84244186db61e76d5b2fe1c /arch/powerpc/boot/crt0.S
parent36874579dbf4cafa31486d4207c6807efbbf1378 (diff)
downloadop-kernel-dev-66a45dd3620ee5f913ba1af3d2dca8b9bdfa2b96.zip
op-kernel-dev-66a45dd3620ee5f913ba1af3d2dca8b9bdfa2b96.tar.gz
powerpc: Make COFF zImages for old 32-bit powermacs
This adds code to build zImage.coff and/or zImage.initrd.coff when CONFIG_PPC32 and CONFIG_PPC_PMAC are defined. It also restructures the OF client code and adds some workarounds for OF quirks on the older machines. Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/boot/crt0.S')
-rw-r--r--arch/powerpc/boot/crt0.S21
1 files changed, 13 insertions, 8 deletions
diff --git a/arch/powerpc/boot/crt0.S b/arch/powerpc/boot/crt0.S
index d2f2ace..e0192c2 100644
--- a/arch/powerpc/boot/crt0.S
+++ b/arch/powerpc/boot/crt0.S
@@ -12,17 +12,23 @@
#include "ppc_asm.h"
.text
+ /* a procedure descriptor used when booting this as a COFF file */
+_zimage_start_opd:
+ .long _zimage_start, 0, 0, 0
+
.globl _zimage_start
_zimage_start:
+ /* Work out the offset between the address we were linked at
+ and the address where we're running. */
bl 1f
-
-1:
- mflr r0
+1: mflr r0
lis r9,1b@ha
addi r9,r9,1b@l
subf. r0,r9,r0
- beq 3f
+ beq 3f /* if running at same address as linked */
+ /* The .got2 section contains a list of addresses, so add
+ the address offset onto each entry. */
lis r9,__got2_start@ha
addi r9,r9,__got2_start@l
lis r8,__got2_end@ha
@@ -32,15 +38,14 @@ _zimage_start:
srwi. r8,r8,2
mtctr r8
add r9,r0,r9
-2:
- lwz r8,0(r9)
+2: lwz r8,0(r9)
add r8,r8,r0
stw r8,0(r9)
addi r9,r9,4
bdnz 2b
-3:
- lis r9,_start@h
+ /* Do a cache flush for our text, in case OF didn't */
+3: lis r9,_start@h
add r9,r0,r9
lis r8,_etext@ha
addi r8,r8,_etext@l
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