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target/s390x: Fix CLM with M3=0 

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-stable@nongnu.org
Fixes: defb0e3157 ("s390x: Implement opcode helpers")
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Message-Id: <20230724082032.66864-3-iii@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
(cherry picked from commit 4b6e4c0b82)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Ilya Leoshkevich 2023-07-24 10:15:55 +02:00 committed by Michael Tokarev
parent 772caa5f23
commit 34009bfd68
1 changed files with 5 additions and 0 deletions
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5
target/s390x/tcg/mem_helper.c
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@ -704,6 +704,11 @@ 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);