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[Qemu-devel] [PATCH v1 15/22] target-arm: A64: Forbid ERET to increase t
From: |
Edgar E. Iglesias |
Subject: |
[Qemu-devel] [PATCH v1 15/22] target-arm: A64: Forbid ERET to increase the EL |
Date: |
Tue, 6 May 2014 16:08:19 +1000 |
From: "Edgar E. Iglesias" <address@hidden>
Signed-off-by: Edgar E. Iglesias <address@hidden>
---
target-arm/op_helper.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/target-arm/op_helper.c b/target-arm/op_helper.c
index dd9e4fc..770c776 100644
--- a/target-arm/op_helper.c
+++ b/target-arm/op_helper.c
@@ -389,6 +389,7 @@ void HELPER(exception_return)(CPUARMState *env)
unsigned int spsr_idx = arm64_banked_spsr_index(1);
uint32_t spsr = env->banked_spsr[spsr_idx];
int new_el, i;
+ int cur_el = arm_current_pl(env);
if (env->pstate & PSTATE_SP) {
env->sp_el[1] = env->xregs[31];
@@ -410,6 +411,10 @@ void HELPER(exception_return)(CPUARMState *env)
env->regs[15] = env->elr_el[ELR_EL_IDX(1)] & ~0x1;
} else {
new_el = extract32(spsr, 2, 2);
+ if (new_el > cur_el) {
+ /* Disallow returns to higher ELs than the current one. */
+ goto illegal_return;
+ }
if (new_el > 1) {
/* Return to unimplemented EL */
goto illegal_return;
--
1.8.3.2
- [Qemu-devel] [PATCH v1 10/22] target-arm: A64: Introduce arm64_banked_spsr_index(), (continued)
- [Qemu-devel] [PATCH v1 10/22] target-arm: A64: Introduce arm64_banked_spsr_index(), Edgar E. Iglesias, 2014/05/06
- [Qemu-devel] [PATCH v1 11/22] target-arm: Add a feature flag for EL2, Edgar E. Iglesias, 2014/05/06
- [Qemu-devel] [PATCH v1 12/22] target-arm: Add a feature flag for EL3, Edgar E. Iglesias, 2014/05/06
- [Qemu-devel] [PATCH v1 13/22] target-arm: Register EL2 versions of ELR and SPSR, Edgar E. Iglesias, 2014/05/06
- [Qemu-devel] [PATCH v1 14/22] target-arm: Register EL3 versions of ELR and SPSR, Edgar E. Iglesias, 2014/05/06
- [Qemu-devel] [PATCH v1 15/22] target-arm: A64: Forbid ERET to increase the EL,
Edgar E. Iglesias <=
- [Qemu-devel] [PATCH v1 16/22] target-arm: A64: Forbid ERET to unimplemented ELs, Edgar E. Iglesias, 2014/05/06
- [Qemu-devel] [PATCH v1 17/22] target-arm: A64: Generalize ERET to various ELs, Edgar E. Iglesias, 2014/05/06
- [Qemu-devel] [PATCH v1 18/22] target-arm: A64: Generalize update_spsel for the various ELs, Edgar E. Iglesias, 2014/05/06