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target/riscv/pmp: Raise exception if no PMP entry is configured 

As per the privilege specification, any access from S/U mode should fail
if no pmp region is configured.

Signed-off-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-id: 20201223192553.332508-1-atish.patra@wdc.com
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
This commit is contained in:
Atish Patra 2020-12-23 11:25:53 -08:00 committed by Alistair Francis
parent 1a475d39ef
commit d102f19a20
3 changed files with 8 additions and 2 deletions
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5
target/riscv/op_helper.c
View File

@ -150,6 +150,11 @@ 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)) {
riscv_raise_exception(env, RISCV_EXCP_ILLEGAL_INST, GETPC());
}
target_ulong prev_virt = get_field(env->mstatus, MSTATUS_MPV);
mstatus = set_field(mstatus, MSTATUS_MIE,
get_field(mstatus, MSTATUS_MPIE));

4
target/riscv/pmp.c
View File

@ -74,7 +74,7 @@ static inline int pmp_is_locked(CPURISCVState *env, uint32_t pmp_index)
/*
* Count the number of active rules.
*/
static inline uint32_t pmp_get_num_rules(CPURISCVState *env)
uint32_t pmp_get_num_rules(CPURISCVState *env)
{
return env->pmp_state.num_rules;
}
@ -237,7 +237,7 @@ bool pmp_hart_has_privs(CPURISCVState *env, target_ulong addr,
/* Short cut if no rules */
if (0 == pmp_get_num_rules(env)) {
return true;
return (env->priv == PRV_M) ? true : false;
}
if (size == 0) {

1
target/riscv/pmp.h
View File

@ -64,5 +64,6 @@ bool pmp_is_range_in_tlb(CPURISCVState *env, hwaddr tlb_sa,
target_ulong *tlb_size);
void pmp_update_rule_addr(CPURISCVState *env, uint32_t pmp_index);
void pmp_update_rule_nums(CPURISCVState *env);
uint32_t pmp_get_num_rules(CPURISCVState *env);
#endif