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qemu/target/arm/machine.c
Peter Maydell fb602cb726 target/arm: Implement BXNS, and banked stack pointers 
Implement the BXNS v8M instruction, which is like BX but will do a
jump-and-switch-to-NonSecure if the branch target address has bit 0
clear.

This is the first piece of code which implements "switch to the
other security state", so the commit also includes the code to
switch the stack pointers around, which is the only complicated
part of switching security state.

BLXNS is more complicated than just "BXNS but set the link register",
so we leave it for a separate commit.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 1503414539-28762-21-git-send-email-peter.maydell@linaro.org
2017-09-07 13:54:54 +01:00

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#include "qemu/osdep.h"
#include "qemu-common.h"
#include "cpu.h"
#include "hw/hw.h"
#include "hw/boards.h"
#include "qemu/error-report.h"
#include "sysemu/kvm.h"
#include "kvm_arm.h"
#include "internals.h"
#include "migration/cpu.h"
static bool vfp_needed(void *opaque)
{
ARMCPU *cpu = opaque;
CPUARMState *env = &cpu->env;
return arm_feature(env, ARM_FEATURE_VFP);
}
static int get_fpscr(QEMUFile *f, void *opaque, size_t size,
VMStateField *field)
{
ARMCPU *cpu = opaque;
CPUARMState *env = &cpu->env;
uint32_t val = qemu_get_be32(f);
vfp_set_fpscr(env, val);
return 0;
}
static int put_fpscr(QEMUFile *f, void *opaque, size_t size,
VMStateField *field, QJSON *vmdesc)
{
ARMCPU *cpu = opaque;
CPUARMState *env = &cpu->env;
qemu_put_be32(f, vfp_get_fpscr(env));
return 0;
}
static const VMStateInfo vmstate_fpscr = {
.name = "fpscr",
.get = get_fpscr,
.put = put_fpscr,
};
static const VMStateDescription vmstate_vfp = {
.name = "cpu/vfp",
.version_id = 3,
.minimum_version_id = 3,
.needed = vfp_needed,
.fields = (VMStateField[]) {
VMSTATE_FLOAT64_ARRAY(env.vfp.regs, ARMCPU, 64),
/* The xregs array is a little awkward because element 1 (FPSCR)
* requires a specific accessor, so we have to split it up in
* the vmstate:
*/
VMSTATE_UINT32(env.vfp.xregs[0], ARMCPU),
VMSTATE_UINT32_SUB_ARRAY(env.vfp.xregs, ARMCPU, 2, 14),
{
.name = "fpscr",
.version_id = 0,
.size = sizeof(uint32_t),
.info = &vmstate_fpscr,
.flags = VMS_SINGLE,
.offset = 0,
},
VMSTATE_END_OF_LIST()
}
};
static bool iwmmxt_needed(void *opaque)
{
ARMCPU *cpu = opaque;
CPUARMState *env = &cpu->env;
return arm_feature(env, ARM_FEATURE_IWMMXT);
}
static const VMStateDescription vmstate_iwmmxt = {
.name = "cpu/iwmmxt",
.version_id = 1,
.minimum_version_id = 1,
.needed = iwmmxt_needed,
.fields = (VMStateField[]) {
VMSTATE_UINT64_ARRAY(env.iwmmxt.regs, ARMCPU, 16),
VMSTATE_UINT32_ARRAY(env.iwmmxt.cregs, ARMCPU, 16),
VMSTATE_END_OF_LIST()
}
};
static bool m_needed(void *opaque)
{
ARMCPU *cpu = opaque;
CPUARMState *env = &cpu->env;
return arm_feature(env, ARM_FEATURE_M);
}
static const VMStateDescription vmstate_m_faultmask_primask = {
.name = "cpu/m/faultmask-primask",
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_UINT32(env.v7m.faultmask[M_REG_NS], ARMCPU),
VMSTATE_UINT32(env.v7m.primask[M_REG_NS], ARMCPU),
VMSTATE_END_OF_LIST()
}
};
static const VMStateDescription vmstate_m = {
.name = "cpu/m",
.version_id = 4,
.minimum_version_id = 4,
.needed = m_needed,
.fields = (VMStateField[]) {
VMSTATE_UINT32(env.v7m.vecbase[M_REG_NS], ARMCPU),
VMSTATE_UINT32(env.v7m.basepri[M_REG_NS], ARMCPU),
VMSTATE_UINT32(env.v7m.control[M_REG_NS], ARMCPU),
VMSTATE_UINT32(env.v7m.ccr[M_REG_NS], ARMCPU),
VMSTATE_UINT32(env.v7m.cfsr[M_REG_NS], ARMCPU),
VMSTATE_UINT32(env.v7m.hfsr, ARMCPU),
VMSTATE_UINT32(env.v7m.dfsr, ARMCPU),
VMSTATE_UINT32(env.v7m.mmfar[M_REG_NS], ARMCPU),
VMSTATE_UINT32(env.v7m.bfar, ARMCPU),
VMSTATE_UINT32(env.v7m.mpu_ctrl[M_REG_NS], ARMCPU),
VMSTATE_INT32(env.v7m.exception, ARMCPU),
VMSTATE_END_OF_LIST()
},
.subsections = (const VMStateDescription*[]) {
&vmstate_m_faultmask_primask,
NULL
}
};
static bool thumb2ee_needed(void *opaque)
{
ARMCPU *cpu = opaque;
CPUARMState *env = &cpu->env;
return arm_feature(env, ARM_FEATURE_THUMB2EE);
}
static const VMStateDescription vmstate_thumb2ee = {
.name = "cpu/thumb2ee",
.version_id = 1,
.minimum_version_id = 1,
.needed = thumb2ee_needed,
.fields = (VMStateField[]) {
VMSTATE_UINT32(env.teecr, ARMCPU),
VMSTATE_UINT32(env.teehbr, ARMCPU),
VMSTATE_END_OF_LIST()
}
};
static bool pmsav7_needed(void *opaque)
{
ARMCPU *cpu = opaque;
CPUARMState *env = &cpu->env;
return arm_feature(env, ARM_FEATURE_PMSA) &&
arm_feature(env, ARM_FEATURE_V7) &&
!arm_feature(env, ARM_FEATURE_V8);
}
static bool pmsav7_rgnr_vmstate_validate(void *opaque, int version_id)
{
ARMCPU *cpu = opaque;
return cpu->env.pmsav7.rnr[M_REG_NS] < cpu->pmsav7_dregion;
}
static const VMStateDescription vmstate_pmsav7 = {
.name = "cpu/pmsav7",
.version_id = 1,
.minimum_version_id = 1,
.needed = pmsav7_needed,
.fields = (VMStateField[]) {
VMSTATE_VARRAY_UINT32(env.pmsav7.drbar, ARMCPU, pmsav7_dregion, 0,
vmstate_info_uint32, uint32_t),
VMSTATE_VARRAY_UINT32(env.pmsav7.drsr, ARMCPU, pmsav7_dregion, 0,
vmstate_info_uint32, uint32_t),
VMSTATE_VARRAY_UINT32(env.pmsav7.dracr, ARMCPU, pmsav7_dregion, 0,
vmstate_info_uint32, uint32_t),
VMSTATE_VALIDATE("rgnr is valid", pmsav7_rgnr_vmstate_validate),
VMSTATE_END_OF_LIST()
}
};
static bool pmsav7_rnr_needed(void *opaque)
{
ARMCPU *cpu = opaque;
CPUARMState *env = &cpu->env;
/* For R profile cores pmsav7.rnr is migrated via the cpreg
* "RGNR" definition in helper.h. For M profile we have to
* migrate it separately.
*/
return arm_feature(env, ARM_FEATURE_M);
}
static const VMStateDescription vmstate_pmsav7_rnr = {
.name = "cpu/pmsav7-rnr",
.version_id = 1,
.minimum_version_id = 1,
.needed = pmsav7_rnr_needed,
.fields = (VMStateField[]) {
VMSTATE_UINT32(env.pmsav7.rnr[M_REG_NS], ARMCPU),
VMSTATE_END_OF_LIST()
}
};
static bool pmsav8_needed(void *opaque)
{
ARMCPU *cpu = opaque;
CPUARMState *env = &cpu->env;
return arm_feature(env, ARM_FEATURE_PMSA) &&
arm_feature(env, ARM_FEATURE_V8);
}
static const VMStateDescription vmstate_pmsav8 = {
.name = "cpu/pmsav8",
.version_id = 1,
.minimum_version_id = 1,
.needed = pmsav8_needed,
.fields = (VMStateField[]) {
VMSTATE_VARRAY_UINT32(env.pmsav8.rbar[M_REG_NS], ARMCPU, pmsav7_dregion,
0, vmstate_info_uint32, uint32_t),
VMSTATE_VARRAY_UINT32(env.pmsav8.rlar[M_REG_NS], ARMCPU, pmsav7_dregion,
0, vmstate_info_uint32, uint32_t),
VMSTATE_UINT32(env.pmsav8.mair0[M_REG_NS], ARMCPU),
VMSTATE_UINT32(env.pmsav8.mair1[M_REG_NS], ARMCPU),
VMSTATE_END_OF_LIST()
}
};
static bool s_rnr_vmstate_validate(void *opaque, int version_id)
{
ARMCPU *cpu = opaque;
return cpu->env.pmsav7.rnr[M_REG_S] < cpu->pmsav7_dregion;
}
static bool m_security_needed(void *opaque)
{
ARMCPU *cpu = opaque;
CPUARMState *env = &cpu->env;
return arm_feature(env, ARM_FEATURE_M_SECURITY);
}
static const VMStateDescription vmstate_m_security = {
.name = "cpu/m-security",
.version_id = 1,
.minimum_version_id = 1,
.needed = m_security_needed,
.fields = (VMStateField[]) {
VMSTATE_UINT32(env.v7m.secure, ARMCPU),
VMSTATE_UINT32(env.v7m.other_ss_msp, ARMCPU),
VMSTATE_UINT32(env.v7m.other_ss_psp, ARMCPU),
VMSTATE_UINT32(env.v7m.basepri[M_REG_S], ARMCPU),
VMSTATE_UINT32(env.v7m.primask[M_REG_S], ARMCPU),
VMSTATE_UINT32(env.v7m.faultmask[M_REG_S], ARMCPU),
VMSTATE_UINT32(env.v7m.control[M_REG_S], ARMCPU),
VMSTATE_UINT32(env.v7m.vecbase[M_REG_S], ARMCPU),
VMSTATE_UINT32(env.pmsav8.mair0[M_REG_S], ARMCPU),
VMSTATE_UINT32(env.pmsav8.mair1[M_REG_S], ARMCPU),
VMSTATE_VARRAY_UINT32(env.pmsav8.rbar[M_REG_S], ARMCPU, pmsav7_dregion,
0, vmstate_info_uint32, uint32_t),
VMSTATE_VARRAY_UINT32(env.pmsav8.rlar[M_REG_S], ARMCPU, pmsav7_dregion,
0, vmstate_info_uint32, uint32_t),
VMSTATE_UINT32(env.pmsav7.rnr[M_REG_S], ARMCPU),
VMSTATE_VALIDATE("secure MPU_RNR is valid", s_rnr_vmstate_validate),
VMSTATE_UINT32(env.v7m.mpu_ctrl[M_REG_S], ARMCPU),
VMSTATE_UINT32(env.v7m.ccr[M_REG_S], ARMCPU),
VMSTATE_UINT32(env.v7m.mmfar[M_REG_S], ARMCPU),
VMSTATE_UINT32(env.v7m.cfsr[M_REG_S], ARMCPU),
VMSTATE_END_OF_LIST()
}
};
static int get_cpsr(QEMUFile *f, void *opaque, size_t size,
VMStateField *field)
{
ARMCPU *cpu = opaque;
CPUARMState *env = &cpu->env;
uint32_t val = qemu_get_be32(f);
if (arm_feature(env, ARM_FEATURE_M)) {
if (val & XPSR_EXCP) {
/* This is a CPSR format value from an older QEMU. (We can tell
* because values transferred in XPSR format always have zero
* for the EXCP field, and CPSR format will always have bit 4
* set in CPSR_M.) Rearrange it into XPSR format. The significant
* differences are that the T bit is not in the same place, the
* primask/faultmask info may be in the CPSR I and F bits, and
* we do not want the mode bits.
* We know that this cleanup happened before v8M, so there
* is no complication with banked primask/faultmask.
*/
uint32_t newval = val;
assert(!arm_feature(env, ARM_FEATURE_M_SECURITY));
newval &= (CPSR_NZCV | CPSR_Q | CPSR_IT | CPSR_GE);
if (val & CPSR_T) {
newval |= XPSR_T;
}
/* If the I or F bits are set then this is a migration from
* an old QEMU which still stored the M profile FAULTMASK
* and PRIMASK in env->daif. For a new QEMU, the data is
* transferred using the vmstate_m_faultmask_primask subsection.
*/
if (val & CPSR_F) {
env->v7m.faultmask[M_REG_NS] = 1;
}
if (val & CPSR_I) {
env->v7m.primask[M_REG_NS] = 1;
}
val = newval;
}
/* Ignore the low bits, they are handled by vmstate_m. */
xpsr_write(env, val, ~XPSR_EXCP);
return 0;
}
env->aarch64 = ((val & PSTATE_nRW) == 0);
if (is_a64(env)) {
pstate_write(env, val);
return 0;
}
cpsr_write(env, val, 0xffffffff, CPSRWriteRaw);
return 0;
}
static int put_cpsr(QEMUFile *f, void *opaque, size_t size,
VMStateField *field, QJSON *vmdesc)
{
ARMCPU *cpu = opaque;
CPUARMState *env = &cpu->env;
uint32_t val;
if (arm_feature(env, ARM_FEATURE_M)) {
/* The low 9 bits are v7m.exception, which is handled by vmstate_m. */
val = xpsr_read(env) & ~XPSR_EXCP;
} else if (is_a64(env)) {
val = pstate_read(env);
} else {
val = cpsr_read(env);
}
qemu_put_be32(f, val);
return 0;
}
static const VMStateInfo vmstate_cpsr = {
.name = "cpsr",
.get = get_cpsr,
.put = put_cpsr,
};
static int get_power(QEMUFile *f, void *opaque, size_t size,
VMStateField *field)
{
ARMCPU *cpu = opaque;
bool powered_off = qemu_get_byte(f);
cpu->power_state = powered_off ? PSCI_OFF : PSCI_ON;
return 0;
}
static int put_power(QEMUFile *f, void *opaque, size_t size,
VMStateField *field, QJSON *vmdesc)
{
ARMCPU *cpu = opaque;
/* Migration should never happen while we transition power states */
if (cpu->power_state == PSCI_ON ||
cpu->power_state == PSCI_OFF) {
bool powered_off = (cpu->power_state == PSCI_OFF) ? true : false;
qemu_put_byte(f, powered_off);
return 0;
} else {
return 1;
}
}
static const VMStateInfo vmstate_powered_off = {
.name = "powered_off",
.get = get_power,
.put = put_power,
};
static void cpu_pre_save(void *opaque)
{
ARMCPU *cpu = opaque;
if (kvm_enabled()) {
if (!write_kvmstate_to_list(cpu)) {
/* This should never fail */
abort();
}
} else {
if (!write_cpustate_to_list(cpu)) {
/* This should never fail. */
abort();
}
}
cpu->cpreg_vmstate_array_len = cpu->cpreg_array_len;
memcpy(cpu->cpreg_vmstate_indexes, cpu->cpreg_indexes,
cpu->cpreg_array_len * sizeof(uint64_t));
memcpy(cpu->cpreg_vmstate_values, cpu->cpreg_values,
cpu->cpreg_array_len * sizeof(uint64_t));
}
static int cpu_post_load(void *opaque, int version_id)
{
ARMCPU *cpu = opaque;
int i, v;
/* Update the values list from the incoming migration data.
* Anything in the incoming data which we don't know about is
* a migration failure; anything we know about but the incoming
* data doesn't specify retains its current (reset) value.
* The indexes list remains untouched -- we only inspect the
* incoming migration index list so we can match the values array
* entries with the right slots in our own values array.
*/
for (i = 0, v = 0; i < cpu->cpreg_array_len
&& v < cpu->cpreg_vmstate_array_len; i++) {
if (cpu->cpreg_vmstate_indexes[v] > cpu->cpreg_indexes[i]) {
/* register in our list but not incoming : skip it */
continue;
}
if (cpu->cpreg_vmstate_indexes[v] < cpu->cpreg_indexes[i]) {
/* register in their list but not ours: fail migration */
return -1;
}
/* matching register, copy the value over */
cpu->cpreg_values[i] = cpu->cpreg_vmstate_values[v];
v++;
}
if (kvm_enabled()) {
if (!write_list_to_kvmstate(cpu, KVM_PUT_FULL_STATE)) {
return -1;
}
/* Note that it's OK for the TCG side not to know about
* every register in the list; KVM is authoritative if
* we're using it.
*/
write_list_to_cpustate(cpu);
} else {
if (!write_list_to_cpustate(cpu)) {
return -1;
}
}
hw_breakpoint_update_all(cpu);
hw_watchpoint_update_all(cpu);
return 0;
}
const VMStateDescription vmstate_arm_cpu = {
.name = "cpu",
.version_id = 22,
.minimum_version_id = 22,
.pre_save = cpu_pre_save,
.post_load = cpu_post_load,
.fields = (VMStateField[]) {
VMSTATE_UINT32_ARRAY(env.regs, ARMCPU, 16),
VMSTATE_UINT64_ARRAY(env.xregs, ARMCPU, 32),
VMSTATE_UINT64(env.pc, ARMCPU),
{
.name = "cpsr",
.version_id = 0,
.size = sizeof(uint32_t),
.info = &vmstate_cpsr,
.flags = VMS_SINGLE,
.offset = 0,
},
VMSTATE_UINT32(env.spsr, ARMCPU),
VMSTATE_UINT64_ARRAY(env.banked_spsr, ARMCPU, 8),
VMSTATE_UINT32_ARRAY(env.banked_r13, ARMCPU, 8),
VMSTATE_UINT32_ARRAY(env.banked_r14, ARMCPU, 8),
VMSTATE_UINT32_ARRAY(env.usr_regs, ARMCPU, 5),
VMSTATE_UINT32_ARRAY(env.fiq_regs, ARMCPU, 5),
VMSTATE_UINT64_ARRAY(env.elr_el, ARMCPU, 4),
VMSTATE_UINT64_ARRAY(env.sp_el, ARMCPU, 4),
/* The length-check must come before the arrays to avoid
* incoming data possibly overflowing the array.
*/
VMSTATE_INT32_POSITIVE_LE(cpreg_vmstate_array_len, ARMCPU),
VMSTATE_VARRAY_INT32(cpreg_vmstate_indexes, ARMCPU,
cpreg_vmstate_array_len,
0, vmstate_info_uint64, uint64_t),
VMSTATE_VARRAY_INT32(cpreg_vmstate_values, ARMCPU,
cpreg_vmstate_array_len,
0, vmstate_info_uint64, uint64_t),
VMSTATE_UINT64(env.exclusive_addr, ARMCPU),
VMSTATE_UINT64(env.exclusive_val, ARMCPU),
VMSTATE_UINT64(env.exclusive_high, ARMCPU),
VMSTATE_UINT64(env.features, ARMCPU),
VMSTATE_UINT32(env.exception.syndrome, ARMCPU),
VMSTATE_UINT32(env.exception.fsr, ARMCPU),
VMSTATE_UINT64(env.exception.vaddress, ARMCPU),
VMSTATE_TIMER_PTR(gt_timer[GTIMER_PHYS], ARMCPU),
VMSTATE_TIMER_PTR(gt_timer[GTIMER_VIRT], ARMCPU),
{
.name = "power_state",
.version_id = 0,
.size = sizeof(bool),
.info = &vmstate_powered_off,
.flags = VMS_SINGLE,
.offset = 0,
},
VMSTATE_END_OF_LIST()
},
.subsections = (const VMStateDescription*[]) {
&vmstate_vfp,
&vmstate_iwmmxt,
&vmstate_m,
&vmstate_thumb2ee,
/* pmsav7_rnr must come before pmsav7 so that we have the
* region number before we test it in the VMSTATE_VALIDATE
* in vmstate_pmsav7.
*/
&vmstate_pmsav7_rnr,
&vmstate_pmsav7,
&vmstate_pmsav8,
&vmstate_m_security,
NULL
}
};
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