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[Qemu-devel] [PATCH v2 2/6] target-arm: Fix handling of SCR.SMD
From: |
Peter Maydell |
Subject: |
[Qemu-devel] [PATCH v2 2/6] target-arm: Fix handling of SCR.SMD |
Date: |
Thu, 11 Feb 2016 16:03:25 +0000 |
We weren't quite implementing the handling of SCR.SMD correctly.
The condition governing whether the SMD bit should apply only
for NS state is "is EL3 is AArch32", not "is the current EL AArch32".
Fix the condition, and clarify the comment both to reflect this and
to expand slightly on what's going on for the v7-no-Virtualization case.
Signed-off-by: Peter Maydell <address@hidden>
Reviewed-by: Sergey Fedorov <address@hidden>
---
The bit about forcing SMD to zero confused me, anyway, since I
expected it to mean "in this function", not elsewhere...
---
target-arm/op_helper.c | 12 +++++++-----
1 file changed, 7 insertions(+), 5 deletions(-)
diff --git a/target-arm/op_helper.c b/target-arm/op_helper.c
index bd48549..4c0980e 100644
--- a/target-arm/op_helper.c
+++ b/target-arm/op_helper.c
@@ -614,12 +614,14 @@ void HELPER(pre_smc)(CPUARMState *env, uint32_t syndrome)
int cur_el = arm_current_el(env);
bool secure = arm_is_secure(env);
bool smd = env->cp15.scr_el3 & SCR_SMD;
- /* On ARMv8 AArch32, SMD only applies to NS state.
- * On ARMv7 SMD only applies to NS state and only if EL2 is available.
- * For ARMv7 non EL2, we force SMD to zero so we don't need to re-check
- * the EL2 condition here.
+ /* 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.
+ * On ARMv7 without the Virtualization extensions, the SMD bit
+ * 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 = is_a64(env) ? smd : (!secure && smd);
+ bool undef = arm_feature(env, ARM_FEATURE_AARCH64) ? smd : smd && !secure;
if (arm_is_psci_call(cpu, EXCP_SMC)) {
/* If PSCI is enabled and this looks like a valid PSCI call then
--
1.9.1
- [Qemu-devel] [PATCH v2 0/6] target-arm: Implement various EL3 traps, Peter Maydell, 2016/02/11
- [Qemu-devel] [PATCH v2 5/6] target-arm: Implement MDCR_EL3.TDA and MDCR_EL2.TDA traps, Peter Maydell, 2016/02/11
- [Qemu-devel] [PATCH v2 6/6] target-arm: Report correct syndrome for FPEXC32_EL2 traps, Peter Maydell, 2016/02/11
- [Qemu-devel] [PATCH v2 2/6] target-arm: Fix handling of SCR.SMD,
Peter Maydell <=
- [Qemu-devel] [PATCH v2 1/6] target-arm: correct CNTFRQ access rights, Peter Maydell, 2016/02/11
- [Qemu-devel] [PATCH v2 3/6] target-arm: Implement MDCR_EL3.TDOSA and MDCR_EL2.TDOSA traps, Peter Maydell, 2016/02/11
- [Qemu-devel] [PATCH v2 4/6] target-arm: Implement MDCR_EL2.TDRA traps, Peter Maydell, 2016/02/11