From: "Edgar E. Iglesias" <edgar.igles...@xilinx.com>
Signed-off-by: Edgar E. Iglesias <edgar.igles...@xilinx.com>
Message-id: 1411718914-6608-8-git-send-email-edgar.igles...@gmail.com
Signed-off-by: Peter Maydell <peter.mayd...@linaro.org>
---
target-arm/cpu.h | 1 +
target-arm/helper-a64.c | 1 +
target-arm/helper.c | 20 +++++++++++++++++++-
target-arm/helper.h | 1 +
target-arm/internals.h | 6 ++++++
target-arm/op_helper.c | 31 +++++++++++++++++++++++++++++++
target-arm/translate-a64.c | 31 ++++++++++++++++++++++---------
7 files changed, 81 insertions(+), 10 deletions(-)
diff --git a/target-arm/cpu.h b/target-arm/cpu.h
index 81e7e81..e13b6d4 100644
--- a/target-arm/cpu.h
+++ b/target-arm/cpu.h
@@ -51,6 +51,7 @@
#define EXCP_EXCEPTION_EXIT 8 /* Return from v7M exception. */
#define EXCP_KERNEL_TRAP 9 /* Jumped to kernel code page. */
#define EXCP_STREX 10
+#define EXCP_HVC 11 /* HyperVisor Call */
#define ARMV7M_EXCP_RESET 1
#define ARMV7M_EXCP_NMI 2
diff --git a/target-arm/helper-a64.c b/target-arm/helper-a64.c
index c6ef8e9..4e6ca26 100644
--- a/target-arm/helper-a64.c
+++ b/target-arm/helper-a64.c
@@ -476,6 +476,7 @@ void aarch64_cpu_do_interrupt(CPUState *cs)
case EXCP_BKPT:
case EXCP_UDEF:
case EXCP_SWI:
+ case EXCP_HVC:
env->cp15.esr_el[new_el] = env->exception.syndrome;
break;
case EXCP_IRQ:
diff --git a/target-arm/helper.c b/target-arm/helper.c
index 25477bd..4d5a653 100644
--- a/target-arm/helper.c
+++ b/target-arm/helper.c
@@ -3769,7 +3769,25 @@ void switch_mode(CPUARMState *env, int mode)
*/
unsigned int arm_excp_target_el(CPUState *cs, unsigned int excp_idx)
{
- return 1;
+ ARMCPU *cpu = ARM_CPU(cs);
+ CPUARMState *env = &cpu->env;
+ unsigned int cur_el = arm_current_pl(env);
+ unsigned int target_el;
+
+ if (!env->aarch64) {
+ /* TODO: Add EL2 and 3 exception handling for AArch32. */
+ return 1;
+ }
+
+ switch (excp_idx) {
+ case EXCP_HVC:
+ target_el = 2;
+ break;
+ default:
+ target_el = MAX(cur_el, 1);
+ break;
+ }
+ return target_el;
}
static void v7m_push(CPUARMState *env, uint32_t val)
diff --git a/target-arm/helper.h b/target-arm/helper.h
index 1d7003b..75fc1b3 100644
--- a/target-arm/helper.h
+++ b/target-arm/helper.h
@@ -50,6 +50,7 @@ DEF_HELPER_2(exception_internal, void, env, i32)
DEF_HELPER_3(exception_with_syndrome, void, env, i32, i32)
DEF_HELPER_1(wfi, void, env)
DEF_HELPER_1(wfe, void, env)
+DEF_HELPER_1(pre_hvc, void, env)
DEF_HELPER_3(cpsr_write, void, env, i32, i32)
DEF_HELPER_1(cpsr_read, i32, env)
diff --git a/target-arm/internals.h b/target-arm/internals.h
index 986a7b1..25c5ec3 100644
--- a/target-arm/internals.h
+++ b/target-arm/internals.h
@@ -53,6 +53,7 @@ static const char * const excnames[] = {
[EXCP_EXCEPTION_EXIT] = "QEMU v7M exception exit",
[EXCP_KERNEL_TRAP] = "QEMU intercept of kernel commpage",
[EXCP_STREX] = "QEMU intercept of STREX",
+ [EXCP_HVC] = "Hypervisor Call",
};
static inline void arm_log_exception(int idx)
@@ -215,6 +216,11 @@ static inline uint32_t syn_aa64_svc(uint32_t imm16)
return (EC_AA64_SVC << ARM_EL_EC_SHIFT) | ARM_EL_IL | (imm16 & 0xffff);
}
+static inline uint32_t syn_aa64_hvc(uint32_t imm16)
+{
+ return (EC_AA64_HVC << ARM_EL_EC_SHIFT) | ARM_EL_IL | (imm16 & 0xffff);
+}
+
static inline uint32_t syn_aa32_svc(uint32_t imm16, bool is_thumb)
{
return (EC_AA32_SVC << ARM_EL_EC_SHIFT) | (imm16 & 0xffff)
diff --git a/target-arm/op_helper.c b/target-arm/op_helper.c
index 25243bd..e5cb690 100644
--- a/target-arm/op_helper.c
+++ b/target-arm/op_helper.c
@@ -385,6 +385,37 @@ void HELPER(clear_pstate_ss)(CPUARMState *env)
env->pstate &= ~PSTATE_SS;
}
+void HELPER(pre_hvc)(CPUARMState *env)
+{
+ int cur_el = arm_current_pl(env);
+ /* FIXME: Use actual secure state. */
+ 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)) {
+ undef = !(env->cp15.scr_el3 & SCR_HCE);
+ } else {
+ undef = env->cp15.hcr_el2 & HCR_HCD;
+ }
+
+ /* In ARMv7 and ARMv8/AArch32, HVC is undef in secure state.
+ * For ARMv8/AArch64, HVC is allowed in EL3.
+ * Note that we've already trapped HVC from EL0 at translation
+ * time.
+ */
+ if (secure && (!is_a64(env) || cur_el == 1)) {
+ undef = true;
+ }
+
+ if (undef) {
+ env->exception.syndrome = syn_uncategorized();
+ raise_exception(env, EXCP_UDEF);
+ }
+}
+
void HELPER(exception_return)(CPUARMState *env)
{
int cur_el = arm_current_pl(env);
diff --git a/target-arm/translate-a64.c b/target-arm/translate-a64.c
index 8e66b6c..f4cb56e 100644
--- a/target-arm/translate-a64.c
+++ b/target-arm/translate-a64.c
@@ -1473,20 +1473,33 @@ static void disas_exc(DisasContext *s, uint32_t insn)
switch (opc) {
case 0:
- /* SVC, HVC, SMC; since we don't support the Virtualization
- * or TrustZone extensions these all UNDEF except SVC.
- */
- if (op2_ll != 1) {
- unallocated_encoding(s);
- break;
- }
/* For SVC, HVC and SMC we advance the single-step state
* machine before taking the exception. This is architecturally
* mandated, to ensure that single-stepping a system call
* instruction works properly.
*/
- gen_ss_advance(s);
- gen_exception_insn(s, 0, EXCP_SWI, syn_aa64_svc(imm16));
+ switch (op2_ll) {
+ case 1:
+ gen_ss_advance(s);
+ 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) {
+ unallocated_encoding(s);
+ break;
+ }
+ /* The pre HVC helper handles cases when HVC gets trapped
+ * as an undefined insn by runtime configuration.
+ */
+ gen_a64_set_pc_im(s->pc - 4);
+ gen_helper_pre_hvc(cpu_env);
+ gen_ss_advance(s);
+ gen_exception_insn(s, 0, EXCP_HVC, syn_aa64_hvc(imm16));
+ break;
+ default:
+ unallocated_encoding(s);
+ break;
+ }
break;
case 1:
if (op2_ll != 0) {
--
1.9.1
