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target-arm: Handle SMC/HVC undef-if-no-ELx in pre_* helpers

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SMC must UNDEF if EL3 is not implemented; similarly HVC UNDEFs
if EL2 is not implemented. Move the handling of this from
translate-a64.c into the pre_smc and pre_hvc helper functions.
This is necessary because use of these instructions for PSCI
takes precedence over this UNDEF case, and we can't tell if
this is a PSCI call until runtime.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 1412865028-17725-5-git-send-email-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2014-10-24 12:19:12 +01:00
parent 3df53cdf56
commit 3940433843
2 changed files with 12 additions and 9 deletions
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17
target-arm/op_helper.c
View file

@ -392,10 +392,11 @@ void HELPER(pre_hvc)(CPUARMState *env)
bool secure = false;
bool undef;
/* We've already checked that EL2 exists at translation time.
* EL3.HCE has priority over EL2.HCD.
*/
if (arm_feature(env, ARM_FEATURE_EL3)) {
if (!arm_feature(env, ARM_FEATURE_EL2)) {
/* If EL2 doesn't exist, HVC always UNDEFs */
undef = true;
} else if (arm_feature(env, ARM_FEATURE_EL3)) {
/* EL3.HCE has priority over EL2.HCD. */
undef = !(env->cp15.scr_el3 & SCR_HCE);
} else {
undef = env->cp15.hcr_el2 & HCR_HCD;
@ -429,13 +430,15 @@ void HELPER(pre_smc)(CPUARMState *env, uint32_t syndrome)
*/
bool undef = is_a64(env) ? smd : (!secure && smd);
/* In NS EL1, HCR controlled routing to EL2 has priority over SMD. */
if (!secure && cur_el == 1 && (env->cp15.hcr_el2 & HCR_TSC)) {
if (!arm_feature(env, ARM_FEATURE_EL3)) {
/* If we have no EL3 then SMC always UNDEFs */
undef = true;
} else if (!secure && cur_el == 1 && (env->cp15.hcr_el2 & HCR_TSC)) {
/* In NS EL1, HCR controlled routing to EL2 has priority over SMD. */
env->exception.syndrome = syndrome;
raise_exception(env, EXCP_HYP_TRAP);
}
/* We've already checked that EL3 exists at translation time. */
if (undef) {
env->exception.syndrome = syn_uncategorized();
raise_exception(env, EXCP_UDEF);

4
target-arm/translate-a64.c
View file

@ -1485,7 +1485,7 @@ static void disas_exc(DisasContext *s, uint32_t insn)
gen_exception_insn(s, 0, EXCP_SWI, syn_aa64_svc(imm16));
break;
case 2:
if (!arm_dc_feature(s, ARM_FEATURE_EL2) || s->current_pl == 0) {
if (s->current_pl == 0) {
unallocated_encoding(s);
break;
}
@ -1498,7 +1498,7 @@ static void disas_exc(DisasContext *s, uint32_t insn)
gen_exception_insn(s, 0, EXCP_HVC, syn_aa64_hvc(imm16));
break;
case 3:
if (!arm_dc_feature(s, ARM_FEATURE_EL3) || s->current_pl == 0) {
if (s->current_pl == 0) {
unallocated_encoding(s);
break;
}