From: Ilya Leoshkevich <i...@linux.ibm.com>
When the mask is zero, access exceptions should still be recognized for
1 byte at the second-operand address. CC should be set to 0.
Cc: qemu-sta...@nongnu.org
Fixes: defb0e3157af ("s390x: Implement opcode helpers")
Reviewed-by: David Hildenbrand <da...@redhat.com>
Reviewed-by: Richard Henderson <richard.hender...@linaro.org>
Signed-off-by: Ilya Leoshkevich <i...@linux.ibm.com>
Message-Id: <20230724082032.66864-3-...@linux.ibm.com>
Signed-off-by: Thomas Huth <th...@redhat.com>
(cherry picked from commit 4b6e4c0b8223681ae85462794848db4386de1a8d)
Signed-off-by: Michael Tokarev <m...@tls.msk.ru>
diff --git a/target/s390x/tcg/mem_helper.c b/target/s390x/tcg/mem_helper.c
index 51894f17f5..541859afe7 100644
--- a/target/s390x/tcg/mem_helper.c
+++ b/target/s390x/tcg/mem_helper.c
@@ -667,6 +667,11 @@ uint32_t HELPER(clm)(CPUS390XState *env, uint32_t r1,
uint32_t mask,
HELPER_LOG("%s: r1 0x%x mask 0x%x addr 0x%" PRIx64 "\n", __func__, r1,
mask, addr);
+ if (!mask) {
+ /* Recognize access exceptions for the first byte */
+ probe_read(env, addr, 1, cpu_mmu_index(env, false), ra);
+ }
+
while (mask) {
if (mask & 8) {
uint8_t d = cpu_ldub_data_ra(env, addr, ra);
--
2.39.2
