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target-s390x: Mask the SIGP order_code to 8bit. 

According to "CPU Signaling and Response", "Signal-Processor Orders",
the order field is bit position 56-63. Without this, the Linux
guest kernel is sometimes unable to stop emulation and enters
an infinite loop of "XXX unknown sigp: 0xffffffff00000005".

Signed-off-by: Philipp Kern <phil@philkern.de>
Reviewed-by: Thomas Huth <thuth@tuxfamily.org>
[agraf: add comment according to email]
Signed-off-by: Alexander Graf <agraf@suse.de>
master
Philipp Kern 2015-08-18 13:50:55 +02:00 committed by Alexander Graf
parent f4b5b021c8
commit 601b9a9008
1 changed files with 2 additions and 1 deletions
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3
target/s390x/misc_helper.c
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@ -515,7 +515,8 @@ uint32_t HELPER(sigp)(CPUS390XState *env, uint64_t order_code, uint32_t r1,
/* Remember: Use "R1 or R1 + 1, whichever is the odd-numbered register"
as parameter (input). Status (output) is always R1. */
switch (order_code) {
/* sigp contains the order code in bit positions 56-63, mask it here. */
switch (order_code & 0xff) {
case SIGP_SET_ARCH:
/* switch arch */
break;