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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>
This commit is contained in:
Richard Henderson 2018-01-22 19:53:48 -08:00 committed by Peter Maydell
parent ef401601d5
commit 5be5e8eda7
2 changed files with 136 additions and 0 deletions
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5
target/arm/cpu.h
View File

@ -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)

131
target/arm/helper.c
View File

@ -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)