diff options
Diffstat (limited to 'target/arm')
| -rw-r--r-- | target/arm/op_helper.c | 54 |
1 files changed, 46 insertions, 8 deletions
diff --git a/target/arm/op_helper.c b/target/arm/op_helper.c index eb6fb82..0d6e89e 100644 --- a/target/arm/op_helper.c +++ b/target/arm/op_helper.c @@ -939,7 +939,38 @@ void HELPER(pre_smc)(CPUARMState *env, uint32_t syndrome) ARMCPU *cpu = arm_env_get_cpu(env); int cur_el = arm_current_el(env); bool secure = arm_is_secure(env); - bool smd = env->cp15.scr_el3 & SCR_SMD; + bool smd_flag = env->cp15.scr_el3 & SCR_SMD; + + /* + * SMC behaviour is summarized in the following table. + * This helper handles the "Trap to EL2" and "Undef insn" cases. + * The "Trap to EL3" and "PSCI call" cases are handled in the exception + * helper. + * + * -> ARM_FEATURE_EL3 and !SMD + * HCR_TSC && NS EL1 !HCR_TSC || !NS EL1 + * + * Conduit SMC, valid call Trap to EL2 PSCI Call + * Conduit SMC, inval call Trap to EL2 Trap to EL3 + * Conduit not SMC Trap to EL2 Trap to EL3 + * + * + * -> ARM_FEATURE_EL3 and SMD + * HCR_TSC && NS EL1 !HCR_TSC || !NS EL1 + * + * Conduit SMC, valid call Trap to EL2 PSCI Call + * Conduit SMC, inval call Trap to EL2 Undef insn + * Conduit not SMC Trap to EL2 Undef insn + * + * + * -> !ARM_FEATURE_EL3 + * HCR_TSC && NS EL1 !HCR_TSC || !NS EL1 + * + * Conduit SMC, valid call Trap to EL2 PSCI Call + * Conduit SMC, inval call Trap to EL2 Undef insn + * Conduit not SMC Undef insn Undef insn + */ + /* On ARMv8 with EL3 AArch64, SMD applies to both S and NS state. * On ARMv8 with EL3 AArch32, or ARMv7 with the Virtualization * extensions, SMD only applies to NS state. @@ -947,7 +978,8 @@ void HELPER(pre_smc)(CPUARMState *env, uint32_t syndrome) * doesn't exist, but we forbid the guest to set it to 1 in scr_write(), * so we need not special case this here. */ - bool undef = arm_feature(env, ARM_FEATURE_AARCH64) ? smd : smd && !secure; + bool smd = arm_feature(env, ARM_FEATURE_AARCH64) ? smd_flag + : smd_flag && !secure; if (!arm_feature(env, ARM_FEATURE_EL3) && cpu->psci_conduit != QEMU_PSCI_CONDUIT_SMC) { @@ -957,21 +989,27 @@ void HELPER(pre_smc)(CPUARMState *env, uint32_t syndrome) * to forbid its EL1 from making PSCI calls into QEMU's * "firmware" via HCR.TSC, so for these purposes treat * PSCI-via-SMC as implying an EL3. + * This handles the very last line of the previous table. */ - undef = true; - } else if (!secure && cur_el == 1 && (env->cp15.hcr_el2 & HCR_TSC)) { + raise_exception(env, EXCP_UDEF, syn_uncategorized(), + exception_target_el(env)); + } + + if (!secure && cur_el == 1 && (env->cp15.hcr_el2 & HCR_TSC)) { /* In NS EL1, HCR controlled routing to EL2 has priority over SMD. * We also want an EL2 guest to be able to forbid its EL1 from * making PSCI calls into QEMU's "firmware" via HCR.TSC. + * This handles all the "Trap to EL2" cases of the previous table. */ raise_exception(env, EXCP_HYP_TRAP, syndrome, 2); } - /* If PSCI is enabled and this looks like a valid PSCI call then - * suppress the UNDEF -- we'll catch the SMC exception and - * implement the PSCI call behaviour there. + /* Catch the two remaining "Undef insn" cases of the previous table: + * - PSCI conduit is SMC but we don't have a valid PCSI call, + * - We don't have EL3 or SMD is set. */ - if (undef && !arm_is_psci_call(cpu, EXCP_SMC)) { + if (!arm_is_psci_call(cpu, EXCP_SMC) && + (smd || !arm_feature(env, ARM_FEATURE_EL3))) { raise_exception(env, EXCP_UDEF, syn_uncategorized(), exception_target_el(env)); } |