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[Qemu-arm] [PATCH 3/6] target-arm: Implement MDCR_EL3.TDOSA and MDCR_EL2
From: |
Peter Maydell |
Subject: |
[Qemu-arm] [PATCH 3/6] target-arm: Implement MDCR_EL3.TDOSA and MDCR_EL2.TDOSA traps |
Date: |
Fri, 5 Feb 2016 16:45:01 +0000 |
Implement the traps to EL2 and EL3 controlled by the bits
MDCR_EL2.TDOSA MDCR_EL3.TDOSA. These can configurably trap
accesses to the "powerdown debug" registers.
Signed-off-by: Peter Maydell <address@hidden>
---
target-arm/cpu.h | 12 ++++++++++++
target-arm/helper.c | 23 ++++++++++++++++++++++-
2 files changed, 34 insertions(+), 1 deletion(-)
diff --git a/target-arm/cpu.h b/target-arm/cpu.h
index 80391fa..d1d6886 100644
--- a/target-arm/cpu.h
+++ b/target-arm/cpu.h
@@ -595,6 +595,18 @@ void pmccntr_sync(CPUARMState *env);
#define CPTR_TTA (1U << 20)
#define CPTR_TFP (1U << 10)
+#define MDCR_EPMAD (1U << 21)
+#define MDCR_EDAD (1U << 20)
+#define MDCR_SPME (1U << 17)
+#define MDCR_SDD (1U << 16)
+#define MDCR_TDRA (1U << 11)
+#define MDCR_TDOSA (1U << 10)
+#define MDCR_TDA (1U << 9)
+#define MDCR_TDE (1U << 8)
+#define MDCR_HPME (1U << 7)
+#define MDCR_TPM (1U << 6)
+#define MDCR_TPMCR (1U << 5)
+
#define CPSR_M (0x1fU)
#define CPSR_T (1U << 5)
#define CPSR_F (1U << 6)
diff --git a/target-arm/helper.c b/target-arm/helper.c
index 082701a..18e85fd 100644
--- a/target-arm/helper.c
+++ b/target-arm/helper.c
@@ -384,6 +384,24 @@ static CPAccessResult access_trap_aa32s_el1(CPUARMState
*env,
return CP_ACCESS_TRAP_UNCATEGORIZED;
}
+/* Check for traps to "powerdown debug" registers, which are controlled
+ * by MDCR.TDOSA
+ */
+static CPAccessResult access_tdosa(CPUARMState *env, const ARMCPRegInfo *ri,
+ bool isread)
+{
+ int el = arm_current_el(env);
+
+ if (el < 2 && (env->cp15.mdcr_el2 & MDCR_TDOSA)
+ && !arm_is_secure_below_el3(env)) {
+ return CP_ACCESS_TRAP_EL2;
+ }
+ if (el < 3 && (env->cp15.mdcr_el3 & MDCR_TDOSA)) {
+ return CP_ACCESS_TRAP_EL3;
+ }
+ return CP_ACCESS_OK;
+}
+
static void dacr_write(CPUARMState *env, const ARMCPRegInfo *ri, uint64_t
value)
{
ARMCPU *cpu = arm_env_get_cpu(env);
@@ -3779,15 +3797,18 @@ static const ARMCPRegInfo debug_cp_reginfo[] = {
{ .name = "OSLAR_EL1", .state = ARM_CP_STATE_BOTH,
.cp = 14, .opc0 = 2, .opc1 = 0, .crn = 1, .crm = 0, .opc2 = 4,
.access = PL1_W, .type = ARM_CP_NO_RAW,
+ .accessfn = access_tdosa,
.writefn = oslar_write },
{ .name = "OSLSR_EL1", .state = ARM_CP_STATE_BOTH,
.cp = 14, .opc0 = 2, .opc1 = 0, .crn = 1, .crm = 1, .opc2 = 4,
.access = PL1_R, .resetvalue = 10,
+ .accessfn = access_tdosa,
.fieldoffset = offsetof(CPUARMState, cp15.oslsr_el1) },
/* Dummy OSDLR_EL1: 32-bit Linux will read this */
{ .name = "OSDLR_EL1", .state = ARM_CP_STATE_BOTH,
.cp = 14, .opc0 = 2, .opc1 = 0, .crn = 1, .crm = 3, .opc2 = 4,
- .access = PL1_RW, .type = ARM_CP_NOP },
+ .access = PL1_RW, .accessfn = access_tdosa,
+ .type = ARM_CP_NOP },
/* Dummy DBGVCR: Linux wants to clear this on startup, but we don't
* implement vector catch debug events yet.
*/
--
1.9.1