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

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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.

Backports commit a80c4256543987ca88407349ee012a673a10a2ae from qemu
This commit is contained in:
Peter Maydell 2019-02-03 17:35:07 -05:00 committed by Lioncash
parent 147269ed81
commit 80248fecb6
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1 changed files with 1 additions and 1 deletions
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qemu/target/arm/translate-a64.c
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@ -2871,7 +2871,7 @@ 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;
}