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target/s390x: fix IPM polluting irrelevant bits

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Suppose psw.mask=0x0000000080000000, cc=2, r1=0 and we do "ipm 1".
This command must touch only bits 32-39, so the expected output
is r1=0x20000000. However, currently qemu yields r1=0x20008000,
because irrelevant parts of PSW leak into r1 during program mask
transfer.

Signed-off-by: Pavel Zbitskiy <pavel.zbitskiy@gmail.com>
Message-Id: <20180821025104.19604-5-pavel.zbitskiy@gmail.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
This commit is contained in:
Pavel Zbitskiy 2018-08-20 22:51:01 -04:00 • committed by Cornelia Huck
parent dc95b31dac
commit 478d360cd9
3 changed files with 30 additions and 10 deletions
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22
tests/tcg/s390x/ipm.c Normal file
View file

@ -0,0 +1,22 @@
#include <stdint.h>
#include <unistd.h>
int main(void)
{
uint32_t op1 = 0x55555555;
uint32_t op2 = 0x44444444;
uint64_t cc = 0xffffffffffffffffull;
asm volatile(
" clc 0(4,%[op1]),0(%[op2])\n"
" ipm %[cc]\n"
: [cc] "+r" (cc)
: [op1] "r" (&op1),
[op2] "r" (&op2)
: "cc");
if (cc != 0xffffffff20ffffffull) {
write(1, "bad cc\n", 7);
return 1;
}
return 0;
}