In AArch64 the breakpoint and watchpoint registers are mandatory, so the
kernel always accesses them on bootup. Implement dummy versions, which
read as written but have no actual effect.
Signed-off-by: Peter Maydell <peter.mayd...@linaro.org>
---
target-arm/cpu.h | 4 ++++
target-arm/helper.c | 32 ++++++++++++++++++++++++++++++++
2 files changed, 36 insertions(+)
diff --git a/target-arm/cpu.h b/target-arm/cpu.h
index 24a8e93..267d5ae 100644
--- a/target-arm/cpu.h
+++ b/target-arm/cpu.h
@@ -216,6 +216,10 @@ typedef struct CPUARMState {
uint32_t c15_diagnostic; /* diagnostic register */
uint32_t c15_power_diagnostic;
uint32_t c15_power_control; /* power control */
+ uint64_t dbgbvr[16]; /* breakpoint value registers */
+ uint64_t dbgbcr[16]; /* breakpoint control registers */
+ uint64_t dbgwvr[16]; /* watchpoint value registers */
+ uint64_t dbgwcr[16]; /* watchpoint control registers */
} cp15;
struct {
diff --git a/target-arm/helper.c b/target-arm/helper.c
index eb37e7e..1621030 100644
--- a/target-arm/helper.c
+++ b/target-arm/helper.c
@@ -1787,6 +1787,37 @@ static CPAccessResult ctr_el0_access(CPUARMState *env,
const ARMCPRegInfo *ri)
return CP_ACCESS_OK;
}
+static void define_aarch64_debug_regs(ARMCPU *cpu)
+{
+ /* Define breakpoint and watchpoint registers. These do nothing
+ * but read as written, for now.
+ */
+ int i;
+
+ for (i = 0; i < 16; i++) {
+ ARMCPRegInfo dbgregs[] = {
+ { .name = "DBGBVR", .state = ARM_CP_STATE_AA64,
+ .opc0 = 2, .opc1 = 0, .crn = 0, .crm = i, .opc2 = 4,
+ .access = PL1_RW,
+ .fieldoffset = offsetof(CPUARMState, cp15.dbgbvr[i]) },
+ { .name = "DBGBCR", .state = ARM_CP_STATE_AA64,
+ .opc0 = 2, .opc1 = 0, .crn = 0, .crm = i, .opc2 = 5,
+ .access = PL1_RW,
+ .fieldoffset = offsetof(CPUARMState, cp15.dbgbcr[i]) },
+ { .name = "DBGWVR", .state = ARM_CP_STATE_AA64,
+ .opc0 = 2, .opc1 = 0, .crn = 0, .crm = i, .opc2 = 6,
+ .access = PL1_RW,
+ .fieldoffset = offsetof(CPUARMState, cp15.dbgwvr[i]) },
+ { .name = "DBGWCR", .state = ARM_CP_STATE_AA64,
+ .opc0 = 2, .opc1 = 0, .crn = 0, .crm = i, .opc2 = 7,
+ .access = PL1_RW,
+ .fieldoffset = offsetof(CPUARMState, cp15.dbgwcr[i]) },
+ REGINFO_SENTINEL
+ };
+ define_arm_cp_regs(cpu, dbgregs);
+ }
+}
+
void register_cp_regs_for_features(ARMCPU *cpu)
{
/* Register all the coprocessor registers based on feature bits */
@@ -1928,6 +1959,7 @@ void register_cp_regs_for_features(ARMCPU *cpu)
};
define_arm_cp_regs(cpu, v8_idregs);
define_arm_cp_regs(cpu, v8_cp_reginfo);
+ define_aarch64_debug_regs(cpu);
}
if (arm_feature(env, ARM_FEATURE_MPU)) {
/* These are the MPU registers prior to PMSAv6. Any new
--
1.8.5
