target/s390x/helper.c

   1 /*
   2  *  S/390 helpers
   3  *
   4  *  Copyright (c) 2009 Ulrich Hecht
   5  *  Copyright (c) 2011 Alexander Graf
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include "qemu/osdep.h"
  22 #include "cpu.h"
  23 #include "internal.h"
  24 #include "exec/gdbstub.h"
  25 #include "qemu/timer.h"
  26 #include "qemu/qemu-print.h"
  27 #include "hw/s390x/ioinst.h"
  28 #include "hw/s390x/pv.h"
  29 #include "sysemu/hw_accel.h"
  30 #include "sysemu/runstate.h"
  31 #ifndef CONFIG_USER_ONLY
  32 #include "sysemu/tcg.h"
  33 #endif
  34
  35 #ifndef CONFIG_USER_ONLY
  36 void s390x_tod_timer(void *opaque)
  37 {
  38     cpu_inject_clock_comparator((S390CPU *) opaque);
  39 }
  40
  41 void s390x_cpu_timer(void *opaque)
  42 {
  43     cpu_inject_cpu_timer((S390CPU *) opaque);
  44 }
  45
  46 hwaddr s390_cpu_get_phys_page_debug(CPUState *cs, vaddr vaddr)
  47 {
  48     S390CPU *cpu = S390_CPU(cs);
  49     CPUS390XState *env = &cpu->env;
  50     target_ulong raddr;
  51     int prot;
  52     uint64_t asc = env->psw.mask & PSW_MASK_ASC;
  53     uint64_t tec;
  54
  55     /* 31-Bit mode */
  56     if (!(env->psw.mask & PSW_MASK_64)) {
  57         vaddr &= 0x7fffffff;
  58     }
  59
  60     /* We want to read the code (e.g., see what we are single-stepping).*/
  61     if (asc != PSW_ASC_HOME) {
  62         asc = PSW_ASC_PRIMARY;
  63     }
  64
  65     /*
  66      * We want to read code even if IEP is active. Use MMU_DATA_LOAD instead
  67      * of MMU_INST_FETCH.
  68      */
  69     if (mmu_translate(env, vaddr, MMU_DATA_LOAD, asc, &raddr, &prot, &tec)) {
  70         return -1;
  71     }
  72     return raddr;
  73 }
  74
  75 hwaddr s390_cpu_get_phys_addr_debug(CPUState *cs, vaddr vaddr)
  76 {
  77     hwaddr phys_addr;
  78     target_ulong page;
  79
  80     page = vaddr & TARGET_PAGE_MASK;
  81     phys_addr = cpu_get_phys_page_debug(cs, page);
  82     phys_addr += (vaddr & ~TARGET_PAGE_MASK);
  83
  84     return phys_addr;
  85 }
  86
  87 static inline bool is_special_wait_psw(uint64_t psw_addr)
  88 {
  89     /* signal quiesce */
  90     return (psw_addr & 0xfffUL) == 0xfffUL;
  91 }
  92
  93 void s390_handle_wait(S390CPU *cpu)
  94 {
  95     CPUState *cs = CPU(cpu);
  96
  97     if (s390_cpu_halt(cpu) == 0) {
  98         if (is_special_wait_psw(cpu->env.psw.addr)) {
  99             qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
 100         } else {
 101             cpu->env.crash_reason = S390_CRASH_REASON_DISABLED_WAIT;
 102             qemu_system_guest_panicked(cpu_get_crash_info(cs));
 103         }
 104     }
 105 }
 106
 107 void load_psw(CPUS390XState *env, uint64_t mask, uint64_t addr)
 108 {
 109     uint64_t old_mask = env->psw.mask;
 110
 111     env->psw.addr = addr;
 112     env->psw.mask = mask;
 113
 114     /* KVM will handle all WAITs and trigger a WAIT exit on disabled_wait */
 115     if (!tcg_enabled()) {
 116         return;
 117     }
 118     env->cc_op = (mask >> 44) & 3;
 119
 120     if ((old_mask ^ mask) & PSW_MASK_PER) {
 121         s390_cpu_recompute_watchpoints(env_cpu(env));
 122     }
 123
 124     if (mask & PSW_MASK_WAIT) {
 125         s390_handle_wait(env_archcpu(env));
 126     }
 127 }
 128
 129 uint64_t get_psw_mask(CPUS390XState *env)
 130 {
 131     uint64_t r = env->psw.mask;
 132
 133     if (tcg_enabled()) {
 134         env->cc_op = calc_cc(env, env->cc_op, env->cc_src, env->cc_dst,
 135                              env->cc_vr);
 136
 137         r &= ~PSW_MASK_CC;
 138         assert(!(env->cc_op & ~3));
 139         r |= (uint64_t)env->cc_op << 44;
 140     }
 141
 142     return r;
 143 }
 144
 145 LowCore *cpu_map_lowcore(CPUS390XState *env)
 146 {
 147     LowCore *lowcore;
 148     hwaddr len = sizeof(LowCore);
 149
 150     lowcore = cpu_physical_memory_map(env->psa, &len, true);
 151
 152     if (len < sizeof(LowCore)) {
 153         cpu_abort(env_cpu(env), "Could not map lowcore\n");
 154     }
 155
 156     return lowcore;
 157 }
 158
 159 void cpu_unmap_lowcore(LowCore *lowcore)
 160 {
 161     cpu_physical_memory_unmap(lowcore, sizeof(LowCore), 1, sizeof(LowCore));
 162 }
 163
 164 void do_restart_interrupt(CPUS390XState *env)
 165 {
 166     uint64_t mask, addr;
 167     LowCore *lowcore;
 168
 169     lowcore = cpu_map_lowcore(env);
 170
 171     lowcore->restart_old_psw.mask = cpu_to_be64(get_psw_mask(env));
 172     lowcore->restart_old_psw.addr = cpu_to_be64(env->psw.addr);
 173     mask = be64_to_cpu(lowcore->restart_new_psw.mask);
 174     addr = be64_to_cpu(lowcore->restart_new_psw.addr);
 175
 176     cpu_unmap_lowcore(lowcore);
 177     env->pending_int &= ~INTERRUPT_RESTART;
 178
 179     load_psw(env, mask, addr);
 180 }
 181
 182 void s390_cpu_recompute_watchpoints(CPUState *cs)
 183 {
 184     const int wp_flags = BP_CPU | BP_MEM_WRITE | BP_STOP_BEFORE_ACCESS;
 185     S390CPU *cpu = S390_CPU(cs);
 186     CPUS390XState *env = &cpu->env;
 187
 188     /* We are called when the watchpoints have changed. First
 189        remove them all.  */
 190     cpu_watchpoint_remove_all(cs, BP_CPU);
 191
 192     /* Return if PER is not enabled */
 193     if (!(env->psw.mask & PSW_MASK_PER)) {
 194         return;
 195     }
 196
 197     /* Return if storage-alteration event is not enabled.  */
 198     if (!(env->cregs[9] & PER_CR9_EVENT_STORE)) {
 199         return;
 200     }
 201
 202     if (env->cregs[10] == 0 && env->cregs[11] == -1LL) {
 203         /* We can't create a watchoint spanning the whole memory range, so
 204            split it in two parts.   */
 205         cpu_watchpoint_insert(cs, 0, 1ULL << 63, wp_flags, NULL);
 206         cpu_watchpoint_insert(cs, 1ULL << 63, 1ULL << 63, wp_flags, NULL);
 207     } else if (env->cregs[10] > env->cregs[11]) {
 208         /* The address range loops, create two watchpoints.  */
 209         cpu_watchpoint_insert(cs, env->cregs[10], -env->cregs[10],
 210                               wp_flags, NULL);
 211         cpu_watchpoint_insert(cs, 0, env->cregs[11] + 1, wp_flags, NULL);
 212
 213     } else {
 214         /* Default case, create a single watchpoint.  */
 215         cpu_watchpoint_insert(cs, env->cregs[10],
 216                               env->cregs[11] - env->cregs[10] + 1,
 217                               wp_flags, NULL);
 218     }
 219 }
 220
 221 typedef struct SigpSaveArea {
 222     uint64_t    fprs[16];                       /* 0x0000 */
 223     uint64_t    grs[16];                        /* 0x0080 */
 224     PSW         psw;                            /* 0x0100 */
 225     uint8_t     pad_0x0110[0x0118 - 0x0110];    /* 0x0110 */
 226     uint32_t    prefix;                         /* 0x0118 */
 227     uint32_t    fpc;                            /* 0x011c */
 228     uint8_t     pad_0x0120[0x0124 - 0x0120];    /* 0x0120 */
 229     uint32_t    todpr;                          /* 0x0124 */
 230     uint64_t    cputm;                          /* 0x0128 */
 231     uint64_t    ckc;                            /* 0x0130 */
 232     uint8_t     pad_0x0138[0x0140 - 0x0138];    /* 0x0138 */
 233     uint32_t    ars[16];                        /* 0x0140 */
 234     uint64_t    crs[16];                        /* 0x0384 */
 235 } SigpSaveArea;
 236 QEMU_BUILD_BUG_ON(sizeof(SigpSaveArea) != 512);
 237
 238 int s390_store_status(S390CPU *cpu, hwaddr addr, bool store_arch)
 239 {
 240     static const uint8_t ar_id = 1;
 241     SigpSaveArea *sa;
 242     hwaddr len = sizeof(*sa);
 243     int i;
 244
 245     /* For PVMs storing will occur when this cpu enters SIE again */
 246     if (s390_is_pv()) {
 247         return 0;
 248     }
 249
 250     sa = cpu_physical_memory_map(addr, &len, true);
 251     if (!sa) {
 252         return -EFAULT;
 253     }
 254     if (len != sizeof(*sa)) {
 255         cpu_physical_memory_unmap(sa, len, 1, 0);
 256         return -EFAULT;
 257     }
 258
 259     if (store_arch) {
 260         cpu_physical_memory_write(offsetof(LowCore, ar_access_id), &ar_id, 1);
 261     }
 262     for (i = 0; i < 16; ++i) {
 263         sa->fprs[i] = cpu_to_be64(*get_freg(&cpu->env, i));
 264     }
 265     for (i = 0; i < 16; ++i) {
 266         sa->grs[i] = cpu_to_be64(cpu->env.regs[i]);
 267     }
 268     sa->psw.addr = cpu_to_be64(cpu->env.psw.addr);
 269     sa->psw.mask = cpu_to_be64(get_psw_mask(&cpu->env));
 270     sa->prefix = cpu_to_be32(cpu->env.psa);
 271     sa->fpc = cpu_to_be32(cpu->env.fpc);
 272     sa->todpr = cpu_to_be32(cpu->env.todpr);
 273     sa->cputm = cpu_to_be64(cpu->env.cputm);
 274     sa->ckc = cpu_to_be64(cpu->env.ckc >> 8);
 275     for (i = 0; i < 16; ++i) {
 276         sa->ars[i] = cpu_to_be32(cpu->env.aregs[i]);
 277     }
 278     for (i = 0; i < 16; ++i) {
 279         sa->crs[i] = cpu_to_be64(cpu->env.cregs[i]);
 280     }
 281
 282     cpu_physical_memory_unmap(sa, len, 1, len);
 283
 284     return 0;
 285 }
 286
 287 typedef struct SigpAdtlSaveArea {
 288     uint64_t    vregs[32][2];                     /* 0x0000 */
 289     uint8_t     pad_0x0200[0x0400 - 0x0200];      /* 0x0200 */
 290     uint64_t    gscb[4];                          /* 0x0400 */
 291     uint8_t     pad_0x0420[0x1000 - 0x0420];      /* 0x0420 */
 292 } SigpAdtlSaveArea;
 293 QEMU_BUILD_BUG_ON(sizeof(SigpAdtlSaveArea) != 4096);
 294
 295 #define ADTL_GS_MIN_SIZE 2048 /* minimal size of adtl save area for GS */
 296 int s390_store_adtl_status(S390CPU *cpu, hwaddr addr, hwaddr len)
 297 {
 298     SigpAdtlSaveArea *sa;
 299     hwaddr save = len;
 300     int i;
 301
 302     sa = cpu_physical_memory_map(addr, &save, true);
 303     if (!sa) {
 304         return -EFAULT;
 305     }
 306     if (save != len) {
 307         cpu_physical_memory_unmap(sa, len, 1, 0);
 308         return -EFAULT;
 309     }
 310
 311     if (s390_has_feat(S390_FEAT_VECTOR)) {
 312         for (i = 0; i < 32; i++) {
 313             sa->vregs[i][0] = cpu_to_be64(cpu->env.vregs[i][0]);
 314             sa->vregs[i][1] = cpu_to_be64(cpu->env.vregs[i][1]);
 315         }
 316     }
 317     if (s390_has_feat(S390_FEAT_GUARDED_STORAGE) && len >= ADTL_GS_MIN_SIZE) {
 318         for (i = 0; i < 4; i++) {
 319             sa->gscb[i] = cpu_to_be64(cpu->env.gscb[i]);
 320         }
 321     }
 322
 323     cpu_physical_memory_unmap(sa, len, 1, len);
 324     return 0;
 325 }
 326 #endif /* CONFIG_USER_ONLY */
 327
 328 void s390_cpu_dump_state(CPUState *cs, FILE *f, int flags)
 329 {
 330     S390CPU *cpu = S390_CPU(cs);
 331     CPUS390XState *env = &cpu->env;
 332     int i;
 333
 334     if (env->cc_op > 3) {
 335         qemu_fprintf(f, "PSW=mask %016" PRIx64 " addr %016" PRIx64 " cc %15s\n",
 336                      env->psw.mask, env->psw.addr, cc_name(env->cc_op));
 337     } else {
 338         qemu_fprintf(f, "PSW=mask %016" PRIx64 " addr %016" PRIx64 " cc %02x\n",
 339                      env->psw.mask, env->psw.addr, env->cc_op);
 340     }
 341
 342     for (i = 0; i < 16; i++) {
 343         qemu_fprintf(f, "R%02d=%016" PRIx64, i, env->regs[i]);
 344         if ((i % 4) == 3) {
 345             qemu_fprintf(f, "\n");
 346         } else {
 347             qemu_fprintf(f, " ");
 348         }
 349     }
 350
 351     if (flags & CPU_DUMP_FPU) {
 352         if (s390_has_feat(S390_FEAT_VECTOR)) {
 353             for (i = 0; i < 32; i++) {
 354                 qemu_fprintf(f, "V%02d=%016" PRIx64 "%016" PRIx64 "%c",
 355                              i, env->vregs[i][0], env->vregs[i][1],
 356                              i % 2 ? '\n' : ' ');
 357             }
 358         } else {
 359             for (i = 0; i < 16; i++) {
 360                 qemu_fprintf(f, "F%02d=%016" PRIx64 "%c",
 361                              i, *get_freg(env, i),
 362                              (i % 4) == 3 ? '\n' : ' ');
 363             }
 364         }
 365     }
 366
 367 #ifndef CONFIG_USER_ONLY
 368     for (i = 0; i < 16; i++) {
 369         qemu_fprintf(f, "C%02d=%016" PRIx64, i, env->cregs[i]);
 370         if ((i % 4) == 3) {
 371             qemu_fprintf(f, "\n");
 372         } else {
 373             qemu_fprintf(f, " ");
 374         }
 375     }
 376 #endif
 377
 378 #ifdef DEBUG_INLINE_BRANCHES
 379     for (i = 0; i < CC_OP_MAX; i++) {
 380         qemu_fprintf(f, "  %15s = %10ld\t%10ld\n", cc_name(i),
 381                      inline_branch_miss[i], inline_branch_hit[i]);
 382     }
 383 #endif
 384
 385     qemu_fprintf(f, "\n");
 386 }
 387
 388 const char *cc_name(enum cc_op cc_op)
 389 {
 390     static const char * const cc_names[] = {
 391         [CC_OP_CONST0]    = "CC_OP_CONST0",
 392         [CC_OP_CONST1]    = "CC_OP_CONST1",
 393         [CC_OP_CONST2]    = "CC_OP_CONST2",
 394         [CC_OP_CONST3]    = "CC_OP_CONST3",
 395         [CC_OP_DYNAMIC]   = "CC_OP_DYNAMIC",
 396         [CC_OP_STATIC]    = "CC_OP_STATIC",
 397         [CC_OP_NZ]        = "CC_OP_NZ",
 398         [CC_OP_LTGT_32]   = "CC_OP_LTGT_32",
 399         [CC_OP_LTGT_64]   = "CC_OP_LTGT_64",
 400         [CC_OP_LTUGTU_32] = "CC_OP_LTUGTU_32",
 401         [CC_OP_LTUGTU_64] = "CC_OP_LTUGTU_64",
 402         [CC_OP_LTGT0_32]  = "CC_OP_LTGT0_32",
 403         [CC_OP_LTGT0_64]  = "CC_OP_LTGT0_64",
 404         [CC_OP_ADD_64]    = "CC_OP_ADD_64",
 405         [CC_OP_ADDU_64]   = "CC_OP_ADDU_64",
 406         [CC_OP_ADDC_64]   = "CC_OP_ADDC_64",
 407         [CC_OP_SUB_64]    = "CC_OP_SUB_64",
 408         [CC_OP_SUBU_64]   = "CC_OP_SUBU_64",
 409         [CC_OP_SUBB_64]   = "CC_OP_SUBB_64",
 410         [CC_OP_ABS_64]    = "CC_OP_ABS_64",
 411         [CC_OP_NABS_64]   = "CC_OP_NABS_64",
 412         [CC_OP_ADD_32]    = "CC_OP_ADD_32",
 413         [CC_OP_ADDU_32]   = "CC_OP_ADDU_32",
 414         [CC_OP_ADDC_32]   = "CC_OP_ADDC_32",
 415         [CC_OP_SUB_32]    = "CC_OP_SUB_32",
 416         [CC_OP_SUBU_32]   = "CC_OP_SUBU_32",
 417         [CC_OP_SUBB_32]   = "CC_OP_SUBB_32",
 418         [CC_OP_ABS_32]    = "CC_OP_ABS_32",
 419         [CC_OP_NABS_32]   = "CC_OP_NABS_32",
 420         [CC_OP_COMP_32]   = "CC_OP_COMP_32",
 421         [CC_OP_COMP_64]   = "CC_OP_COMP_64",
 422         [CC_OP_TM_32]     = "CC_OP_TM_32",
 423         [CC_OP_TM_64]     = "CC_OP_TM_64",
 424         [CC_OP_NZ_F32]    = "CC_OP_NZ_F32",
 425         [CC_OP_NZ_F64]    = "CC_OP_NZ_F64",
 426         [CC_OP_NZ_F128]   = "CC_OP_NZ_F128",
 427         [CC_OP_ICM]       = "CC_OP_ICM",
 428         [CC_OP_SLA_32]    = "CC_OP_SLA_32",
 429         [CC_OP_SLA_64]    = "CC_OP_SLA_64",
 430         [CC_OP_FLOGR]     = "CC_OP_FLOGR",
 431         [CC_OP_LCBB]      = "CC_OP_LCBB",
 432         [CC_OP_VC]        = "CC_OP_VC",
 433     };
 434
 435     return cc_names[cc_op];
 436 }