Re: [kvm-unit-tests PATCH 1/8] s390x: Fix fpc store address in RESTORE_REGS_STACK

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On 09/02/2021 14.49, Janosch Frank wrote:
The efpc stores in bits 32-63 of a register and we store a full 8
bytes to have the stack 8 byte aligned. This means that the fpc is
stored at offset 4 but we load it from offset 0. Lets replace efpc
with stfpc and get rid of the stg to store at offset 0.

Signed-off-by: Janosch Frank <frankja@xxxxxxxxxxxxx>
Reviewed-by: Claudio Imbrenda <imbrenda@xxxxxxxxxxxxx>
Reviewed-by: Pierre Morel <pmorel@xxxxxxxxxxxxx>
---
  s390x/macros.S | 3 +--
  1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/s390x/macros.S b/s390x/macros.S
index 37a6a63e..e51a557a 100644
--- a/s390x/macros.S
+++ b/s390x/macros.S
@@ -54,8 +54,7 @@
  	.endr
  	/* Save fpc, but keep stack aligned on 64bits */
  	slgfi   %r15, 8
-	efpc	%r0
-	stg	%r0, 0(%r15)
+	stfpc	0(%r15)
  	.endm
Reviewed-by: Thomas Huth <thuth@xxxxxxxxxx>




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