M profile cores do not have the RFE or SRS instructions, so correctly UNDEF these insn patterns on those cores.
Signed-off-by: Peter Maydell <peter.mayd...@linaro.org> --- target-arm/translate.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/target-arm/translate.c b/target-arm/translate.c index 62a4c15..9746869 100644 --- a/target-arm/translate.c +++ b/target-arm/translate.c @@ -8135,9 +8135,10 @@ static int disas_thumb2_insn(CPUARMState *env, DisasContext *s, uint16_t insn_hw } else { /* Load/store multiple, RFE, SRS. */ if (((insn >> 23) & 1) == ((insn >> 24) & 1)) { - /* Not available in user mode. */ - if (IS_USER(s)) + /* RFE, SRS: not available in user mode or on M profile */ + if (IS_USER(s) || IS_M(env)) { goto illegal_op; + } if (insn & (1 << 20)) { /* rfe */ addr = load_reg(s, rn); -- 1.7.9.5