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Fix CPU POST test failure

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The CPU POST test code (run from cpu_post_exec_31()) doesn't follow the
ABI carefully, at least the CR3, CR4, and CR5 fields of CR are clobbered
by it. The gcc-4.2 with its more aggressive optimization exposes this fact.
This patch just saves the CR value before running the test code, so allowing
it to do anything it wants with CR.

Signed-off-by: Dmitry Rakhchev <rda@emcraft.com>
Acked-by: Yuri Tikhonov <yur@emcraft.com>
--
This commit is contained in:
Yuri Tikhonov 2008-02-21 11:06:07 +01:00 committed by Wolfgang Denk
parent b6f29c84c2
commit 928d1d77f8
1 changed files with 3 additions and 0 deletions
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3
post/lib_ppc/asm.S
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@ -308,7 +308,10 @@ cpu_post_exec_31:
lwz r3, 0(r4)
lwz r4, 0(r5)
mr r6, r7
mfcr r7
blrl
mtcr r7
lwz r7, 8(r1)
stw r3, 0(r7)