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authorRichard Henderson <richard.henderson@linaro.org>2018-01-22 19:53:48 -0800
committerPeter Maydell <peter.maydell@linaro.org>2018-02-09 10:55:22 +0000
commit5be5e8eda78474f6e89a54af12ee6f44234115ed (patch)
treebf931cc0f3b8745f414c1fab9d7eb688d6e16969 /target/arm
parentef401601d5561f9805102695d5e65d72594f7020 (diff)
target/arm: Add ZCR_ELx
Define ZCR_EL[1-3]. Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Message-id: 20180123035349.24538-5-richard.henderson@linaro.org Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Diffstat (limited to 'target/arm')
-rw-r--r--target/arm/cpu.h5
-rw-r--r--target/arm/helper.c131
2 files changed, 136 insertions, 0 deletions
diff --git a/target/arm/cpu.h b/target/arm/cpu.h
index 966d2fdbb1..1b2ff0f3ce 100644
--- a/target/arm/cpu.h
+++ b/target/arm/cpu.h
@@ -549,6 +549,9 @@ typedef struct CPUARMState {
*/
float_status fp_status;
float_status standard_fp_status;
+
+ /* ZCR_EL[1-3] */
+ uint64_t zcr_el[4];
} vfp;
uint64_t exclusive_addr;
uint64_t exclusive_val;
@@ -923,6 +926,8 @@ void pmccntr_sync(CPUARMState *env);
#define CPTR_TCPAC (1U << 31)
#define CPTR_TTA (1U << 20)
#define CPTR_TFP (1U << 10)
+#define CPTR_TZ (1U << 8) /* CPTR_EL2 */
+#define CPTR_EZ (1U << 8) /* CPTR_EL3 */
#define MDCR_EPMAD (1U << 21)
#define MDCR_EDAD (1U << 20)
diff --git a/target/arm/helper.c b/target/arm/helper.c
index c6e3b3913e..673c476455 100644
--- a/target/arm/helper.c
+++ b/target/arm/helper.c
@@ -4266,6 +4266,125 @@ static const ARMCPRegInfo debug_lpae_cp_reginfo[] = {
REGINFO_SENTINEL
};
+/* Return the exception level to which SVE-disabled exceptions should
+ * be taken, or 0 if SVE is enabled.
+ */
+static int sve_exception_el(CPUARMState *env)
+{
+#ifndef CONFIG_USER_ONLY
+ unsigned current_el = arm_current_el(env);
+
+ /* The CPACR.ZEN controls traps to EL1:
+ * 0, 2 : trap EL0 and EL1 accesses
+ * 1 : trap only EL0 accesses
+ * 3 : trap no accesses
+ */
+ switch (extract32(env->cp15.cpacr_el1, 16, 2)) {
+ default:
+ if (current_el <= 1) {
+ /* Trap to PL1, which might be EL1 or EL3 */
+ if (arm_is_secure(env) && !arm_el_is_aa64(env, 3)) {
+ return 3;
+ }
+ return 1;
+ }
+ break;
+ case 1:
+ if (current_el == 0) {
+ return 1;
+ }
+ break;
+ case 3:
+ break;
+ }
+
+ /* Similarly for CPACR.FPEN, after having checked ZEN. */
+ switch (extract32(env->cp15.cpacr_el1, 20, 2)) {
+ default:
+ if (current_el <= 1) {
+ if (arm_is_secure(env) && !arm_el_is_aa64(env, 3)) {
+ return 3;
+ }
+ return 1;
+ }
+ break;
+ case 1:
+ if (current_el == 0) {
+ return 1;
+ }
+ break;
+ case 3:
+ break;
+ }
+
+ /* CPTR_EL2. Check both TZ and TFP. */
+ if (current_el <= 2
+ && (env->cp15.cptr_el[2] & (CPTR_TFP | CPTR_TZ))
+ && !arm_is_secure_below_el3(env)) {
+ return 2;
+ }
+
+ /* CPTR_EL3. Check both EZ and TFP. */
+ if (!(env->cp15.cptr_el[3] & CPTR_EZ)
+ || (env->cp15.cptr_el[3] & CPTR_TFP)) {
+ return 3;
+ }
+#endif
+ return 0;
+}
+
+static CPAccessResult zcr_access(CPUARMState *env, const ARMCPRegInfo *ri,
+ bool isread)
+{
+ switch (sve_exception_el(env)) {
+ case 3:
+ return CP_ACCESS_TRAP_EL3;
+ case 2:
+ return CP_ACCESS_TRAP_EL2;
+ case 1:
+ return CP_ACCESS_TRAP;
+ }
+ return CP_ACCESS_OK;
+}
+
+static void zcr_write(CPUARMState *env, const ARMCPRegInfo *ri,
+ uint64_t value)
+{
+ /* Bits other than [3:0] are RAZ/WI. */
+ raw_write(env, ri, value & 0xf);
+}
+
+static const ARMCPRegInfo zcr_el1_reginfo = {
+ .name = "ZCR_EL1", .state = ARM_CP_STATE_AA64,
+ .opc0 = 3, .opc1 = 0, .crn = 1, .crm = 2, .opc2 = 0,
+ .access = PL1_RW, .accessfn = zcr_access, .type = ARM_CP_64BIT,
+ .fieldoffset = offsetof(CPUARMState, vfp.zcr_el[1]),
+ .writefn = zcr_write, .raw_writefn = raw_write
+};
+
+static const ARMCPRegInfo zcr_el2_reginfo = {
+ .name = "ZCR_EL2", .state = ARM_CP_STATE_AA64,
+ .opc0 = 3, .opc1 = 4, .crn = 1, .crm = 2, .opc2 = 0,
+ .access = PL2_RW, .accessfn = zcr_access, .type = ARM_CP_64BIT,
+ .fieldoffset = offsetof(CPUARMState, vfp.zcr_el[2]),
+ .writefn = zcr_write, .raw_writefn = raw_write
+};
+
+static const ARMCPRegInfo zcr_no_el2_reginfo = {
+ .name = "ZCR_EL2", .state = ARM_CP_STATE_AA64,
+ .opc0 = 3, .opc1 = 4, .crn = 1, .crm = 2, .opc2 = 0,
+ .access = PL2_RW, .type = ARM_CP_64BIT,
+ .readfn = arm_cp_read_zero, .writefn = arm_cp_write_ignore
+};
+
+static const ARMCPRegInfo zcr_el3_reginfo = {
+ .name = "ZCR_EL3", .state = ARM_CP_STATE_AA64,
+ .opc0 = 3, .opc1 = 6, .crn = 1, .crm = 2, .opc2 = 0,
+ .access = PL3_RW, .accessfn = zcr_access, .type = ARM_CP_64BIT,
+ .fieldoffset = offsetof(CPUARMState, vfp.zcr_el[3]),
+ .writefn = zcr_write, .raw_writefn = raw_write
+};
+
void hw_watchpoint_update(ARMCPU *cpu, int n)
{
CPUARMState *env = &cpu->env;
@@ -5332,6 +5451,18 @@ void register_cp_regs_for_features(ARMCPU *cpu)
}
define_one_arm_cp_reg(cpu, &sctlr);
}
+
+ if (arm_feature(env, ARM_FEATURE_SVE)) {
+ define_one_arm_cp_reg(cpu, &zcr_el1_reginfo);
+ if (arm_feature(env, ARM_FEATURE_EL2)) {
+ define_one_arm_cp_reg(cpu, &zcr_el2_reginfo);
+ } else {
+ define_one_arm_cp_reg(cpu, &zcr_no_el2_reginfo);
+ }
+ if (arm_feature(env, ARM_FEATURE_EL3)) {
+ define_one_arm_cp_reg(cpu, &zcr_el3_reginfo);
+ }
+ }
}
void arm_cpu_register_gdb_regs_for_features(ARMCPU *cpu)