[POWERPC] Fix corruption in hcall9

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.  r12 holds the ninth return value from
the hypervisor call, so without this fix, the caller will see the
wrong value for the ninth element in the array that gets the return
values.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

diff --git a/arch/powerpc/platforms/pseries/hvCall.S b/arch/powerpc/platforms/pseries/hvCall.S
index c00cfed7af2c0a8b2531ff8e62f620ba971e21c2..527da445aaa5166fe581ec844e6c9c6c1e291b1e 100644 (file)
--- a/arch/powerpc/platforms/pseries/hvCall.S
+++ b/arch/powerpc/platforms/pseries/hvCall.S
@@ -145,6 +145,7 @@ _GLOBAL(plpar_hcall9)
 
        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 @@ _GLOBAL(plpar_hcall9)
        std     r9, 40(r12)
        std     r10,48(r12)
        std     r11,56(r12)
-       std     r12,64(r12)
+       std     r0, 64(r12)
 
        HCALL_INST_POSTCALL