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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>
This commit is contained in:
Nikita Shubin 2021-12-14 12:26:59 +03:00 committed by Alistair Francis
parent d70075373a
commit 0fbb5d2d3c
1 changed files with 2 additions and 1 deletions
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3
target/riscv/op_helper.c
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@ -146,7 +146,8 @@ target_ulong helper_mret(CPURISCVState *env, target_ulong cpu_pc_deb)
uint64_t mstatus = env->mstatus;
target_ulong prev_priv = get_field(mstatus, MSTATUS_MPP);
if (!pmp_get_num_rules(env) && (prev_priv != PRV_M)) {
if (riscv_feature(env, RISCV_FEATURE_PMP) &&
!pmp_get_num_rules(env) && (prev_priv != PRV_M)) {
riscv_raise_exception(env, RISCV_EXCP_ILLEGAL_INST, GETPC());
}