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target/arm/translate-a64: Don't underdecode PRFM 

The PRFM prefetch insn in the load/store with imm9 encodings
requires idx field 0b00; we were underdecoding this by
only checking !is_unpriv (which is equivalent to idx != 2).
Correctly UNDEF the unallocated encodings where idx == 0b01
and 0b11 as well as 0b10.

Reported-by: Laurent Desnogues <laurent.desnogues@gmail.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Laurent Desnogues <laurent.desnogues@gmail.com>
Message-id: 20190125182626.9221-3-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2019-02-01 14:55:44 +00:00
parent 08d5e3bde6
commit a80c425654
1 changed files with 1 additions and 1 deletions
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target/arm/translate-a64.c
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@ -2803,7 +2803,7 @@ static void disas_ldst_reg_imm9(DisasContext *s, uint32_t insn,
} else {
if (size == 3 && opc == 2) {
/* PRFM - prefetch */
if (is_unpriv) {
if (idx != 0) {
unallocated_encoding(s);
return;
}