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powerpc/boot: don't clobber r6 and r7 in epapr boot 

We use r6 and r7 for epapr boot, but the current pre-C init will clobber
both of these.

This change does a simple replacement, of r6 -> r12 and r7 -> r13, so
that we hit platform init with these registers intact.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Jeremy Kerr 2015-02-11 12:55:44 +08:00 committed by Michael Ellerman
parent 8c06f0d910
commit 7f664cf9e4
1 changed files with 12 additions and 12 deletions
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24
arch/powerpc/boot/crt0.S
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@ -155,29 +155,29 @@ p_base: mflr r10 /* r10 now points to runtime addr of p_base */
ld r9,(p_rela-p_base)(r10)
add r9,r9,r10
li r7,0
li r13,0
li r8,0
9: ld r6,0(r11) /* get tag */
cmpdi r6,0
9: ld r12,0(r11) /* get tag */
cmpdi r12,0
beq 12f /* end of list */
cmpdi r6,RELA
cmpdi r12,RELA
bne 10f
ld r7,8(r11) /* get RELA pointer in r7 */
ld r13,8(r11) /* get RELA pointer in r13 */
b 11f
10: addis r6,r6,(-RELACOUNT)@ha
cmpdi r6,RELACOUNT@l
10: addis r12,r12,(-RELACOUNT)@ha
cmpdi r12,RELACOUNT@l
bne 11f
ld r8,8(r11) /* get RELACOUNT value in r8 */
11: addi r11,r11,16
b 9b
12:
cmpdi r7,0 /* check we have both RELA and RELACOUNT */
cmpdi r13,0 /* check we have both RELA and RELACOUNT */
cmpdi cr1,r8,0
beq 3f
beq cr1,3f
/* Calcuate the runtime offset. */
subf r7,r7,r9
subf r13,r13,r9
/* Run through the list of relocations and process the
* R_PPC64_RELATIVE ones. */
@ -185,10 +185,10 @@ p_base: mflr r10 /* r10 now points to runtime addr of p_base */
13: ld r0,8(r9) /* ELF64_R_TYPE(reloc->r_info) */
cmpdi r0,22 /* R_PPC64_RELATIVE */
bne 3f
ld r6,0(r9) /* reloc->r_offset */
ld r12,0(r9) /* reloc->r_offset */
ld r0,16(r9) /* reloc->r_addend */
add r0,r0,r7
stdx r0,r7,r6
add r0,r0,r13
stdx r0,r13,r12
addi r9,r9,24
bdnz 13b