target/riscv/pmp: fix no pmp illegal intrs
As per the privilege specification, any access from S/U mode should fail
if no pmp region is configured and pmp is present, othwerwise access
should succeed.
Fixes: d102f19a20
(target/riscv/pmp: Raise exception if no PMP entry is configured)
Signed-off-by: Nikita Shubin <n.shubin@yadro.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-id: 20211214092659.15709-1-nikita.shubin@maquefel.me
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
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@ -146,7 +146,8 @@ target_ulong helper_mret(CPURISCVState *env, target_ulong cpu_pc_deb)
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uint64_t mstatus = env->mstatus;
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target_ulong prev_priv = get_field(mstatus, MSTATUS_MPP);
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if (!pmp_get_num_rules(env) && (prev_priv != PRV_M)) {
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if (riscv_feature(env, RISCV_FEATURE_PMP) &&
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!pmp_get_num_rules(env) && (prev_priv != PRV_M)) {
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riscv_raise_exception(env, RISCV_EXCP_ILLEGAL_INST, GETPC());
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}
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