target-arm/machine.c

   1 #include "hw/hw.h"
   2 #include "hw/boards.h"
   3 #include "sysemu/kvm.h"
   4 #include "kvm_arm.h"
   5
   6 static bool vfp_needed(void *opaque)
   7 {
   8     ARMCPU *cpu = opaque;
   9     CPUARMState *env = &cpu->env;
  10
  11     return arm_feature(env, ARM_FEATURE_VFP);
  12 }
  13
  14 static int get_fpscr(QEMUFile *f, void *opaque, size_t size)
  15 {
  16     ARMCPU *cpu = opaque;
  17     CPUARMState *env = &cpu->env;
  18     uint32_t val = qemu_get_be32(f);
  19
  20     vfp_set_fpscr(env, val);
  21     return 0;
  22 }
  23
  24 static void put_fpscr(QEMUFile *f, void *opaque, size_t size)
  25 {
  26     ARMCPU *cpu = opaque;
  27     CPUARMState *env = &cpu->env;
  28
  29     qemu_put_be32(f, vfp_get_fpscr(env));
  30 }
  31
  32 static const VMStateInfo vmstate_fpscr = {
  33     .name = "fpscr",
  34     .get = get_fpscr,
  35     .put = put_fpscr,
  36 };
  37
  38 static const VMStateDescription vmstate_vfp = {
  39     .name = "cpu/vfp",
  40     .version_id = 3,
  41     .minimum_version_id = 3,
  42     .fields = (VMStateField[]) {
  43         VMSTATE_FLOAT64_ARRAY(env.vfp.regs, ARMCPU, 64),
  44         /* The xregs array is a little awkward because element 1 (FPSCR)
  45          * requires a specific accessor, so we have to split it up in
  46          * the vmstate:
  47          */
  48         VMSTATE_UINT32(env.vfp.xregs[0], ARMCPU),
  49         VMSTATE_UINT32_SUB_ARRAY(env.vfp.xregs, ARMCPU, 2, 14),
  50         {
  51             .name = "fpscr",
  52             .version_id = 0,
  53             .size = sizeof(uint32_t),
  54             .info = &vmstate_fpscr,
  55             .flags = VMS_SINGLE,
  56             .offset = 0,
  57         },
  58         VMSTATE_END_OF_LIST()
  59     }
  60 };
  61
  62 static bool iwmmxt_needed(void *opaque)
  63 {
  64     ARMCPU *cpu = opaque;
  65     CPUARMState *env = &cpu->env;
  66
  67     return arm_feature(env, ARM_FEATURE_IWMMXT);
  68 }
  69
  70 static const VMStateDescription vmstate_iwmmxt = {
  71     .name = "cpu/iwmmxt",
  72     .version_id = 1,
  73     .minimum_version_id = 1,
  74     .fields = (VMStateField[]) {
  75         VMSTATE_UINT64_ARRAY(env.iwmmxt.regs, ARMCPU, 16),
  76         VMSTATE_UINT32_ARRAY(env.iwmmxt.cregs, ARMCPU, 16),
  77         VMSTATE_END_OF_LIST()
  78     }
  79 };
  80
  81 static bool m_needed(void *opaque)
  82 {
  83     ARMCPU *cpu = opaque;
  84     CPUARMState *env = &cpu->env;
  85
  86     return arm_feature(env, ARM_FEATURE_M);
  87 }
  88
  89 static const VMStateDescription vmstate_m = {
  90     .name = "cpu/m",
  91     .version_id = 1,
  92     .minimum_version_id = 1,
  93     .fields = (VMStateField[]) {
  94         VMSTATE_UINT32(env.v7m.other_sp, ARMCPU),
  95         VMSTATE_UINT32(env.v7m.vecbase, ARMCPU),
  96         VMSTATE_UINT32(env.v7m.basepri, ARMCPU),
  97         VMSTATE_UINT32(env.v7m.control, ARMCPU),
  98         VMSTATE_INT32(env.v7m.current_sp, ARMCPU),
  99         VMSTATE_INT32(env.v7m.exception, ARMCPU),
 100         VMSTATE_END_OF_LIST()
 101     }
 102 };
 103
 104 static bool thumb2ee_needed(void *opaque)
 105 {
 106     ARMCPU *cpu = opaque;
 107     CPUARMState *env = &cpu->env;
 108
 109     return arm_feature(env, ARM_FEATURE_THUMB2EE);
 110 }
 111
 112 static const VMStateDescription vmstate_thumb2ee = {
 113     .name = "cpu/thumb2ee",
 114     .version_id = 1,
 115     .minimum_version_id = 1,
 116     .fields = (VMStateField[]) {
 117         VMSTATE_UINT32(env.teecr, ARMCPU),
 118         VMSTATE_UINT32(env.teehbr, ARMCPU),
 119         VMSTATE_END_OF_LIST()
 120     }
 121 };
 122
 123 static int get_cpsr(QEMUFile *f, void *opaque, size_t size)
 124 {
 125     ARMCPU *cpu = opaque;
 126     CPUARMState *env = &cpu->env;
 127     uint32_t val = qemu_get_be32(f);
 128
 129     /* Avoid mode switch when restoring CPSR */
 130     env->uncached_cpsr = val & CPSR_M;
 131     cpsr_write(env, val, 0xffffffff);
 132     return 0;
 133 }
 134
 135 static void put_cpsr(QEMUFile *f, void *opaque, size_t size)
 136 {
 137     ARMCPU *cpu = opaque;
 138     CPUARMState *env = &cpu->env;
 139
 140     qemu_put_be32(f, cpsr_read(env));
 141 }
 142
 143 static const VMStateInfo vmstate_cpsr = {
 144     .name = "cpsr",
 145     .get = get_cpsr,
 146     .put = put_cpsr,
 147 };
 148
 149 static void cpu_pre_save(void *opaque)
 150 {
 151     ARMCPU *cpu = opaque;
 152
 153     if (kvm_enabled()) {
 154         if (!write_kvmstate_to_list(cpu)) {
 155             /* This should never fail */
 156             abort();
 157         }
 158     } else {
 159         if (!write_cpustate_to_list(cpu)) {
 160             /* This should never fail. */
 161             abort();
 162         }
 163     }
 164
 165     cpu->cpreg_vmstate_array_len = cpu->cpreg_array_len;
 166     memcpy(cpu->cpreg_vmstate_indexes, cpu->cpreg_indexes,
 167            cpu->cpreg_array_len * sizeof(uint64_t));
 168     memcpy(cpu->cpreg_vmstate_values, cpu->cpreg_values,
 169            cpu->cpreg_array_len * sizeof(uint64_t));
 170 }
 171
 172 static int cpu_post_load(void *opaque, int version_id)
 173 {
 174     ARMCPU *cpu = opaque;
 175     int i, v;
 176
 177     /* Update the values list from the incoming migration data.
 178      * Anything in the incoming data which we don't know about is
 179      * a migration failure; anything we know about but the incoming
 180      * data doesn't specify retains its current (reset) value.
 181      * The indexes list remains untouched -- we only inspect the
 182      * incoming migration index list so we can match the values array
 183      * entries with the right slots in our own values array.
 184      */
 185
 186     for (i = 0, v = 0; i < cpu->cpreg_array_len
 187              && v < cpu->cpreg_vmstate_array_len; i++) {
 188         if (cpu->cpreg_vmstate_indexes[v] > cpu->cpreg_indexes[i]) {
 189             /* register in our list but not incoming : skip it */
 190             continue;
 191         }
 192         if (cpu->cpreg_vmstate_indexes[v] < cpu->cpreg_indexes[i]) {
 193             /* register in their list but not ours: fail migration */
 194             return -1;
 195         }
 196         /* matching register, copy the value over */
 197         cpu->cpreg_values[i] = cpu->cpreg_vmstate_values[v];
 198         v++;
 199     }
 200
 201     if (kvm_enabled()) {
 202         if (!write_list_to_kvmstate(cpu)) {
 203             return -1;
 204         }
 205         /* Note that it's OK for the TCG side not to know about
 206          * every register in the list; KVM is authoritative if
 207          * we're using it.
 208          */
 209         write_list_to_cpustate(cpu);
 210     } else {
 211         if (!write_list_to_cpustate(cpu)) {
 212             return -1;
 213         }
 214     }
 215
 216     return 0;
 217 }
 218
 219 const VMStateDescription vmstate_arm_cpu = {
 220     .name = "cpu",
 221     .version_id = 20,
 222     .minimum_version_id = 20,
 223     .pre_save = cpu_pre_save,
 224     .post_load = cpu_post_load,
 225     .fields = (VMStateField[]) {
 226         VMSTATE_UINT32_ARRAY(env.regs, ARMCPU, 16),
 227         {
 228             .name = "cpsr",
 229             .version_id = 0,
 230             .size = sizeof(uint32_t),
 231             .info = &vmstate_cpsr,
 232             .flags = VMS_SINGLE,
 233             .offset = 0,
 234         },
 235         VMSTATE_UINT32(env.spsr, ARMCPU),
 236         VMSTATE_UINT64_ARRAY(env.banked_spsr, ARMCPU, 8),
 237         VMSTATE_UINT32_ARRAY(env.banked_r13, ARMCPU, 6),
 238         VMSTATE_UINT32_ARRAY(env.banked_r14, ARMCPU, 6),
 239         VMSTATE_UINT32_ARRAY(env.usr_regs, ARMCPU, 5),
 240         VMSTATE_UINT32_ARRAY(env.fiq_regs, ARMCPU, 5),
 241         VMSTATE_UINT64_ARRAY(env.elr_el, ARMCPU, 4),
 242         VMSTATE_UINT64_ARRAY(env.sp_el, ARMCPU, 4),
 243         /* The length-check must come before the arrays to avoid
 244          * incoming data possibly overflowing the array.
 245          */
 246         VMSTATE_INT32_POSITIVE_LE(cpreg_vmstate_array_len, ARMCPU),
 247         VMSTATE_VARRAY_INT32(cpreg_vmstate_indexes, ARMCPU,
 248                              cpreg_vmstate_array_len,
 249                              0, vmstate_info_uint64, uint64_t),
 250         VMSTATE_VARRAY_INT32(cpreg_vmstate_values, ARMCPU,
 251                              cpreg_vmstate_array_len,
 252                              0, vmstate_info_uint64, uint64_t),
 253         VMSTATE_UINT64(env.exclusive_addr, ARMCPU),
 254         VMSTATE_UINT64(env.exclusive_val, ARMCPU),
 255         VMSTATE_UINT64(env.exclusive_high, ARMCPU),
 256         VMSTATE_UINT64(env.features, ARMCPU),
 257         VMSTATE_UINT32(env.exception.syndrome, ARMCPU),
 258         VMSTATE_UINT32(env.exception.fsr, ARMCPU),
 259         VMSTATE_UINT64(env.exception.vaddress, ARMCPU),
 260         VMSTATE_TIMER(gt_timer[GTIMER_PHYS], ARMCPU),
 261         VMSTATE_TIMER(gt_timer[GTIMER_VIRT], ARMCPU),
 262         VMSTATE_END_OF_LIST()
 263     },
 264     .subsections = (VMStateSubsection[]) {
 265         {
 266             .vmsd = &vmstate_vfp,
 267             .needed = vfp_needed,
 268         } , {
 269             .vmsd = &vmstate_iwmmxt,
 270             .needed = iwmmxt_needed,
 271         } , {
 272             .vmsd = &vmstate_m,
 273             .needed = m_needed,
 274         } , {
 275             .vmsd = &vmstate_thumb2ee,
 276             .needed = thumb2ee_needed,
 277         } , {
 278             /* empty */
 279         }
 280     }
 281 };