[PATCH] Fix corruption in hcall9

[Anton Blanchard]

It looks to me like we are corrupting r12 in the hcall9 function.
Although we have r0 free we cant use offsets against it, so save
away r12 in there instead.

Signed-off-by: Anton Blanchard <anton at samba.org>
---

diff -ru linux-2.6.20-rc3-orig/arch/powerpc/platforms/pseries/hvCall.S linux-2.6.20-rc3/arch/powerpc/platforms/pseries/hvCall.S
--- linux-2.6.20-rc3-orig/arch/powerpc/platforms/pseries/hvCall.S	2006-11-29 15:57:37.000000000 -0600
+++ linux-2.6.20-rc3/arch/powerpc/platforms/pseries/hvCall.S	2007-01-08 07:34:45.000000000 -0600
@@ -145,6 +145,7 @@
 
 	HVSC				/* invoke the hypervisor */
 
+	mr	r0,r12
 	ld	r12,STK_PARM(r4)(r1)
 	std	r4,  0(r12)
 	std	r5,  8(r12)
@@ -154,7 +155,7 @@
 	std	r9, 40(r12)
 	std	r10,48(r12)
 	std	r11,56(r12)
-	std	r12,64(r12)
+	std	r0, 64(r12)
 
 	HCALL_INST_POSTCALL