target-s390x/mem_helper.c

   1 /*
   2  *  S/390 memory access helper routines
   3  *
   4  *  Copyright (c) 2009 Ulrich Hecht
   5  *  Copyright (c) 2009 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 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 "cpu.h"
  22 #include "helper.h"
  23
  24 /*****************************************************************************/
  25 /* Softmmu support */
  26 #if !defined(CONFIG_USER_ONLY)
  27 #include "exec/softmmu_exec.h"
  28
  29 #define MMUSUFFIX _mmu
  30
  31 #define SHIFT 0
  32 #include "exec/softmmu_template.h"
  33
  34 #define SHIFT 1
  35 #include "exec/softmmu_template.h"
  36
  37 #define SHIFT 2
  38 #include "exec/softmmu_template.h"
  39
  40 #define SHIFT 3
  41 #include "exec/softmmu_template.h"
  42
  43 /* try to fill the TLB and return an exception if error. If retaddr is
  44    NULL, it means that the function was called in C code (i.e. not
  45    from generated code or from helper.c) */
  46 /* XXX: fix it to restore all registers */
  47 void tlb_fill(CPUS390XState *env, target_ulong addr, int is_write, int mmu_idx,
  48               uintptr_t retaddr)
  49 {
  50     int ret;
  51
  52     ret = cpu_s390x_handle_mmu_fault(env, addr, is_write, mmu_idx);
  53     if (unlikely(ret != 0)) {
  54         if (likely(retaddr)) {
  55             /* now we have a real cpu fault */
  56             cpu_restore_state(env, retaddr);
  57         }
  58         cpu_loop_exit(env);
  59     }
  60 }
  61
  62 #endif
  63
  64 /* #define DEBUG_HELPER */
  65 #ifdef DEBUG_HELPER
  66 #define HELPER_LOG(x...) qemu_log(x)
  67 #else
  68 #define HELPER_LOG(x...)
  69 #endif
  70
  71 #ifndef CONFIG_USER_ONLY
  72 static void mvc_fast_memset(CPUS390XState *env, uint32_t l, uint64_t dest,
  73                             uint8_t byte)
  74 {
  75     hwaddr dest_phys;
  76     hwaddr len = l;
  77     void *dest_p;
  78     uint64_t asc = env->psw.mask & PSW_MASK_ASC;
  79     int flags;
  80
  81     if (mmu_translate(env, dest, 1, asc, &dest_phys, &flags)) {
  82         cpu_stb_data(env, dest, byte);
  83         cpu_abort(env, "should never reach here");
  84     }
  85     dest_phys |= dest & ~TARGET_PAGE_MASK;
  86
  87     dest_p = cpu_physical_memory_map(dest_phys, &len, 1);
  88
  89     memset(dest_p, byte, len);
  90
  91     cpu_physical_memory_unmap(dest_p, 1, len, len);
  92 }
  93
  94 static void mvc_fast_memmove(CPUS390XState *env, uint32_t l, uint64_t dest,
  95                              uint64_t src)
  96 {
  97     hwaddr dest_phys;
  98     hwaddr src_phys;
  99     hwaddr len = l;
 100     void *dest_p;
 101     void *src_p;
 102     uint64_t asc = env->psw.mask & PSW_MASK_ASC;
 103     int flags;
 104
 105     if (mmu_translate(env, dest, 1, asc, &dest_phys, &flags)) {
 106         cpu_stb_data(env, dest, 0);
 107         cpu_abort(env, "should never reach here");
 108     }
 109     dest_phys |= dest & ~TARGET_PAGE_MASK;
 110
 111     if (mmu_translate(env, src, 0, asc, &src_phys, &flags)) {
 112         cpu_ldub_data(env, src);
 113         cpu_abort(env, "should never reach here");
 114     }
 115     src_phys |= src & ~TARGET_PAGE_MASK;
 116
 117     dest_p = cpu_physical_memory_map(dest_phys, &len, 1);
 118     src_p = cpu_physical_memory_map(src_phys, &len, 0);
 119
 120     memmove(dest_p, src_p, len);
 121
 122     cpu_physical_memory_unmap(dest_p, 1, len, len);
 123     cpu_physical_memory_unmap(src_p, 0, len, len);
 124 }
 125 #endif
 126
 127 /* and on array */
 128 uint32_t HELPER(nc)(CPUS390XState *env, uint32_t l, uint64_t dest,
 129                     uint64_t src)
 130 {
 131     int i;
 132     unsigned char x;
 133     uint32_t cc = 0;
 134
 135     HELPER_LOG("%s l %d dest %" PRIx64 " src %" PRIx64 "\n",
 136                __func__, l, dest, src);
 137     for (i = 0; i <= l; i++) {
 138         x = cpu_ldub_data(env, dest + i) & cpu_ldub_data(env, src + i);
 139         if (x) {
 140             cc = 1;
 141         }
 142         cpu_stb_data(env, dest + i, x);
 143     }
 144     return cc;
 145 }
 146
 147 /* xor on array */
 148 uint32_t HELPER(xc)(CPUS390XState *env, uint32_t l, uint64_t dest,
 149                     uint64_t src)
 150 {
 151     int i;
 152     unsigned char x;
 153     uint32_t cc = 0;
 154
 155     HELPER_LOG("%s l %d dest %" PRIx64 " src %" PRIx64 "\n",
 156                __func__, l, dest, src);
 157
 158 #ifndef CONFIG_USER_ONLY
 159     /* xor with itself is the same as memset(0) */
 160     if ((l > 32) && (src == dest) &&
 161         (src & TARGET_PAGE_MASK) == ((src + l) & TARGET_PAGE_MASK)) {
 162         mvc_fast_memset(env, l + 1, dest, 0);
 163         return 0;
 164     }
 165 #else
 166     if (src == dest) {
 167         memset(g2h(dest), 0, l + 1);
 168         return 0;
 169     }
 170 #endif
 171
 172     for (i = 0; i <= l; i++) {
 173         x = cpu_ldub_data(env, dest + i) ^ cpu_ldub_data(env, src + i);
 174         if (x) {
 175             cc = 1;
 176         }
 177         cpu_stb_data(env, dest + i, x);
 178     }
 179     return cc;
 180 }
 181
 182 /* or on array */
 183 uint32_t HELPER(oc)(CPUS390XState *env, uint32_t l, uint64_t dest,
 184                     uint64_t src)
 185 {
 186     int i;
 187     unsigned char x;
 188     uint32_t cc = 0;
 189
 190     HELPER_LOG("%s l %d dest %" PRIx64 " src %" PRIx64 "\n",
 191                __func__, l, dest, src);
 192     for (i = 0; i <= l; i++) {
 193         x = cpu_ldub_data(env, dest + i) | cpu_ldub_data(env, src + i);
 194         if (x) {
 195             cc = 1;
 196         }
 197         cpu_stb_data(env, dest + i, x);
 198     }
 199     return cc;
 200 }
 201
 202 /* memmove */
 203 void HELPER(mvc)(CPUS390XState *env, uint32_t l, uint64_t dest, uint64_t src)
 204 {
 205     int i = 0;
 206     int x = 0;
 207     uint32_t l_64 = (l + 1) / 8;
 208
 209     HELPER_LOG("%s l %d dest %" PRIx64 " src %" PRIx64 "\n",
 210                __func__, l, dest, src);
 211
 212 #ifndef CONFIG_USER_ONLY
 213     if ((l > 32) &&
 214         (src & TARGET_PAGE_MASK) == ((src + l) & TARGET_PAGE_MASK) &&
 215         (dest & TARGET_PAGE_MASK) == ((dest + l) & TARGET_PAGE_MASK)) {
 216         if (dest == (src + 1)) {
 217             mvc_fast_memset(env, l + 1, dest, cpu_ldub_data(env, src));
 218             return;
 219         } else if ((src & TARGET_PAGE_MASK) != (dest & TARGET_PAGE_MASK)) {
 220             mvc_fast_memmove(env, l + 1, dest, src);
 221             return;
 222         }
 223     }
 224 #else
 225     if (dest == (src + 1)) {
 226         memset(g2h(dest), cpu_ldub_data(env, src), l + 1);
 227         return;
 228     } else {
 229         memmove(g2h(dest), g2h(src), l + 1);
 230         return;
 231     }
 232 #endif
 233
 234     /* handle the parts that fit into 8-byte loads/stores */
 235     if (dest != (src + 1)) {
 236         for (i = 0; i < l_64; i++) {
 237             cpu_stq_data(env, dest + x, cpu_ldq_data(env, src + x));
 238             x += 8;
 239         }
 240     }
 241
 242     /* slow version crossing pages with byte accesses */
 243     for (i = x; i <= l; i++) {
 244         cpu_stb_data(env, dest + i, cpu_ldub_data(env, src + i));
 245     }
 246 }
 247
 248 /* compare unsigned byte arrays */
 249 uint32_t HELPER(clc)(CPUS390XState *env, uint32_t l, uint64_t s1, uint64_t s2)
 250 {
 251     int i;
 252     unsigned char x, y;
 253     uint32_t cc;
 254
 255     HELPER_LOG("%s l %d s1 %" PRIx64 " s2 %" PRIx64 "\n",
 256                __func__, l, s1, s2);
 257     for (i = 0; i <= l; i++) {
 258         x = cpu_ldub_data(env, s1 + i);
 259         y = cpu_ldub_data(env, s2 + i);
 260         HELPER_LOG("%02x (%c)/%02x (%c) ", x, x, y, y);
 261         if (x < y) {
 262             cc = 1;
 263             goto done;
 264         } else if (x > y) {
 265             cc = 2;
 266             goto done;
 267         }
 268     }
 269     cc = 0;
 270  done:
 271     HELPER_LOG("\n");
 272     return cc;
 273 }
 274
 275 /* compare logical under mask */
 276 uint32_t HELPER(clm)(CPUS390XState *env, uint32_t r1, uint32_t mask,
 277                      uint64_t addr)
 278 {
 279     uint8_t r, d;
 280     uint32_t cc;
 281
 282     HELPER_LOG("%s: r1 0x%x mask 0x%x addr 0x%" PRIx64 "\n", __func__, r1,
 283                mask, addr);
 284     cc = 0;
 285     while (mask) {
 286         if (mask & 8) {
 287             d = cpu_ldub_data(env, addr);
 288             r = (r1 & 0xff000000UL) >> 24;
 289             HELPER_LOG("mask 0x%x %02x/%02x (0x%" PRIx64 ") ", mask, r, d,
 290                        addr);
 291             if (r < d) {
 292                 cc = 1;
 293                 break;
 294             } else if (r > d) {
 295                 cc = 2;
 296                 break;
 297             }
 298             addr++;
 299         }
 300         mask = (mask << 1) & 0xf;
 301         r1 <<= 8;
 302     }
 303     HELPER_LOG("\n");
 304     return cc;
 305 }
 306
 307 static inline uint64_t fix_address(CPUS390XState *env, uint64_t a)
 308 {
 309     /* 31-Bit mode */
 310     if (!(env->psw.mask & PSW_MASK_64)) {
 311         a &= 0x7fffffff;
 312     }
 313     return a;
 314 }
 315
 316 static inline uint64_t get_address(CPUS390XState *env, int x2, int b2, int d2)
 317 {
 318     uint64_t r = d2;
 319     if (x2) {
 320         r += env->regs[x2];
 321     }
 322     if (b2) {
 323         r += env->regs[b2];
 324     }
 325     return fix_address(env, r);
 326 }
 327
 328 static inline uint64_t get_address_31fix(CPUS390XState *env, int reg)
 329 {
 330     return fix_address(env, env->regs[reg]);
 331 }
 332
 333 /* search string (c is byte to search, r2 is string, r1 end of string) */
 334 uint64_t HELPER(srst)(CPUS390XState *env, uint64_t r0, uint64_t end,
 335                       uint64_t str)
 336 {
 337     uint32_t len;
 338     uint8_t v, c = r0;
 339
 340     str = fix_address(env, str);
 341     end = fix_address(env, end);
 342
 343     /* Assume for now that R2 is unmodified.  */
 344     env->retxl = str;
 345
 346     /* Lest we fail to service interrupts in a timely manner, limit the
 347        amount of work we're willing to do.  For now, let's cap at 8k.  */
 348     for (len = 0; len < 0x2000; ++len) {
 349         if (str + len == end) {
 350             /* Character not found.  R1 & R2 are unmodified.  */
 351             env->cc_op = 2;
 352             return end;
 353         }
 354         v = cpu_ldub_data(env, str + len);
 355         if (v == c) {
 356             /* Character found.  Set R1 to the location; R2 is unmodified.  */
 357             env->cc_op = 1;
 358             return str + len;
 359         }
 360     }
 361
 362     /* CPU-determined bytes processed.  Advance R2 to next byte to process.  */
 363     env->retxl = str + len;
 364     env->cc_op = 3;
 365     return end;
 366 }
 367
 368 /* unsigned string compare (c is string terminator) */
 369 uint64_t HELPER(clst)(CPUS390XState *env, uint64_t c, uint64_t s1, uint64_t s2)
 370 {
 371     uint32_t len;
 372
 373     c = c & 0xff;
 374     s1 = fix_address(env, s1);
 375     s2 = fix_address(env, s2);
 376
 377     /* Lest we fail to service interrupts in a timely manner, limit the
 378        amount of work we're willing to do.  For now, let's cap at 8k.  */
 379     for (len = 0; len < 0x2000; ++len) {
 380         uint8_t v1 = cpu_ldub_data(env, s1 + len);
 381         uint8_t v2 = cpu_ldub_data(env, s2 + len);
 382         if (v1 == v2) {
 383             if (v1 == c) {
 384                 /* Equal.  CC=0, and don't advance the registers.  */
 385                 env->cc_op = 0;
 386                 env->retxl = s2;
 387                 return s1;
 388             }
 389         } else {
 390             /* Unequal.  CC={1,2}, and advance the registers.  Note that
 391                the terminator need not be zero, but the string that contains
 392                the terminator is by definition "low".  */
 393             env->cc_op = (v1 == c ? 1 : v2 == c ? 2 : v1 < v2 ? 1 : 2);
 394             env->retxl = s2 + len;
 395             return s1 + len;
 396         }
 397     }
 398
 399     /* CPU-determined bytes equal; advance the registers.  */
 400     env->cc_op = 3;
 401     env->retxl = s2 + len;
 402     return s1 + len;
 403 }
 404
 405 /* move page */
 406 void HELPER(mvpg)(CPUS390XState *env, uint64_t r0, uint64_t r1, uint64_t r2)
 407 {
 408     /* XXX missing r0 handling */
 409     env->cc_op = 0;
 410 #ifdef CONFIG_USER_ONLY
 411     memmove(g2h(r1), g2h(r2), TARGET_PAGE_SIZE);
 412 #else
 413     mvc_fast_memmove(env, TARGET_PAGE_SIZE, r1, r2);
 414 #endif
 415 }
 416
 417 /* string copy (c is string terminator) */
 418 uint64_t HELPER(mvst)(CPUS390XState *env, uint64_t c, uint64_t d, uint64_t s)
 419 {
 420     uint32_t len;
 421
 422     c = c & 0xff;
 423     d = fix_address(env, d);
 424     s = fix_address(env, s);
 425
 426     /* Lest we fail to service interrupts in a timely manner, limit the
 427        amount of work we're willing to do.  For now, let's cap at 8k.  */
 428     for (len = 0; len < 0x2000; ++len) {
 429         uint8_t v = cpu_ldub_data(env, s + len);
 430         cpu_stb_data(env, d + len, v);
 431         if (v == c) {
 432             /* Complete.  Set CC=1 and advance R1.  */
 433             env->cc_op = 1;
 434             env->retxl = s;
 435             return d + len;
 436         }
 437     }
 438
 439     /* Incomplete.  Set CC=3 and signal to advance R1 and R2.  */
 440     env->cc_op = 3;
 441     env->retxl = s + len;
 442     return d + len;
 443 }
 444
 445 static uint32_t helper_icm(CPUS390XState *env, uint32_t r1, uint64_t address,
 446                            uint32_t mask)
 447 {
 448     int pos = 24; /* top of the lower half of r1 */
 449     uint64_t rmask = 0xff000000ULL;
 450     uint8_t val = 0;
 451     int ccd = 0;
 452     uint32_t cc = 0;
 453
 454     while (mask) {
 455         if (mask & 8) {
 456             env->regs[r1] &= ~rmask;
 457             val = cpu_ldub_data(env, address);
 458             if ((val & 0x80) && !ccd) {
 459                 cc = 1;
 460             }
 461             ccd = 1;
 462             if (val && cc == 0) {
 463                 cc = 2;
 464             }
 465             env->regs[r1] |= (uint64_t)val << pos;
 466             address++;
 467         }
 468         mask = (mask << 1) & 0xf;
 469         pos -= 8;
 470         rmask >>= 8;
 471     }
 472
 473     return cc;
 474 }
 475
 476 /* execute instruction
 477    this instruction executes an insn modified with the contents of r1
 478    it does not change the executed instruction in memory
 479    it does not change the program counter
 480    in other words: tricky...
 481    currently implemented by interpreting the cases it is most commonly used in
 482 */
 483 uint32_t HELPER(ex)(CPUS390XState *env, uint32_t cc, uint64_t v1,
 484                     uint64_t addr, uint64_t ret)
 485 {
 486     uint16_t insn = cpu_lduw_code(env, addr);
 487
 488     HELPER_LOG("%s: v1 0x%lx addr 0x%lx insn 0x%x\n", __func__, v1, addr,
 489                insn);
 490     if ((insn & 0xf0ff) == 0xd000) {
 491         uint32_t l, insn2, b1, b2, d1, d2;
 492
 493         l = v1 & 0xff;
 494         insn2 = cpu_ldl_code(env, addr + 2);
 495         b1 = (insn2 >> 28) & 0xf;
 496         b2 = (insn2 >> 12) & 0xf;
 497         d1 = (insn2 >> 16) & 0xfff;
 498         d2 = insn2 & 0xfff;
 499         switch (insn & 0xf00) {
 500         case 0x200:
 501             helper_mvc(env, l, get_address(env, 0, b1, d1),
 502                        get_address(env, 0, b2, d2));
 503             break;
 504         case 0x500:
 505             cc = helper_clc(env, l, get_address(env, 0, b1, d1),
 506                             get_address(env, 0, b2, d2));
 507             break;
 508         case 0x700:
 509             cc = helper_xc(env, l, get_address(env, 0, b1, d1),
 510                            get_address(env, 0, b2, d2));
 511             break;
 512         case 0xc00:
 513             helper_tr(env, l, get_address(env, 0, b1, d1),
 514                       get_address(env, 0, b2, d2));
 515             break;
 516         default:
 517             goto abort;
 518             break;
 519         }
 520     } else if ((insn & 0xff00) == 0x0a00) {
 521         /* supervisor call */
 522         HELPER_LOG("%s: svc %ld via execute\n", __func__, (insn | v1) & 0xff);
 523         env->psw.addr = ret - 4;
 524         env->int_svc_code = (insn | v1) & 0xff;
 525         env->int_svc_ilen = 4;
 526         helper_exception(env, EXCP_SVC);
 527     } else if ((insn & 0xff00) == 0xbf00) {
 528         uint32_t insn2, r1, r3, b2, d2;
 529
 530         insn2 = cpu_ldl_code(env, addr + 2);
 531         r1 = (insn2 >> 20) & 0xf;
 532         r3 = (insn2 >> 16) & 0xf;
 533         b2 = (insn2 >> 12) & 0xf;
 534         d2 = insn2 & 0xfff;
 535         cc = helper_icm(env, r1, get_address(env, 0, b2, d2), r3);
 536     } else {
 537     abort:
 538         cpu_abort(env, "EXECUTE on instruction prefix 0x%x not implemented\n",
 539                   insn);
 540     }
 541     return cc;
 542 }
 543
 544 /* load access registers r1 to r3 from memory at a2 */
 545 void HELPER(lam)(CPUS390XState *env, uint32_t r1, uint64_t a2, uint32_t r3)
 546 {
 547     int i;
 548
 549     for (i = r1;; i = (i + 1) % 16) {
 550         env->aregs[i] = cpu_ldl_data(env, a2);
 551         a2 += 4;
 552
 553         if (i == r3) {
 554             break;
 555         }
 556     }
 557 }
 558
 559 /* store access registers r1 to r3 in memory at a2 */
 560 void HELPER(stam)(CPUS390XState *env, uint32_t r1, uint64_t a2, uint32_t r3)
 561 {
 562     int i;
 563
 564     for (i = r1;; i = (i + 1) % 16) {
 565         cpu_stl_data(env, a2, env->aregs[i]);
 566         a2 += 4;
 567
 568         if (i == r3) {
 569             break;
 570         }
 571     }
 572 }
 573
 574 /* move long */
 575 uint32_t HELPER(mvcl)(CPUS390XState *env, uint32_t r1, uint32_t r2)
 576 {
 577     uint64_t destlen = env->regs[r1 + 1] & 0xffffff;
 578     uint64_t dest = get_address_31fix(env, r1);
 579     uint64_t srclen = env->regs[r2 + 1] & 0xffffff;
 580     uint64_t src = get_address_31fix(env, r2);
 581     uint8_t pad = src >> 24;
 582     uint8_t v;
 583     uint32_t cc;
 584
 585     if (destlen == srclen) {
 586         cc = 0;
 587     } else if (destlen < srclen) {
 588         cc = 1;
 589     } else {
 590         cc = 2;
 591     }
 592
 593     if (srclen > destlen) {
 594         srclen = destlen;
 595     }
 596
 597     for (; destlen && srclen; src++, dest++, destlen--, srclen--) {
 598         v = cpu_ldub_data(env, src);
 599         cpu_stb_data(env, dest, v);
 600     }
 601
 602     for (; destlen; dest++, destlen--) {
 603         cpu_stb_data(env, dest, pad);
 604     }
 605
 606     env->regs[r1 + 1] = destlen;
 607     /* can't use srclen here, we trunc'ed it */
 608     env->regs[r2 + 1] -= src - env->regs[r2];
 609     env->regs[r1] = dest;
 610     env->regs[r2] = src;
 611
 612     return cc;
 613 }
 614
 615 /* move long extended another memcopy insn with more bells and whistles */
 616 uint32_t HELPER(mvcle)(CPUS390XState *env, uint32_t r1, uint64_t a2,
 617                        uint32_t r3)
 618 {
 619     uint64_t destlen = env->regs[r1 + 1];
 620     uint64_t dest = env->regs[r1];
 621     uint64_t srclen = env->regs[r3 + 1];
 622     uint64_t src = env->regs[r3];
 623     uint8_t pad = a2 & 0xff;
 624     uint8_t v;
 625     uint32_t cc;
 626
 627     if (!(env->psw.mask & PSW_MASK_64)) {
 628         destlen = (uint32_t)destlen;
 629         srclen = (uint32_t)srclen;
 630         dest &= 0x7fffffff;
 631         src &= 0x7fffffff;
 632     }
 633
 634     if (destlen == srclen) {
 635         cc = 0;
 636     } else if (destlen < srclen) {
 637         cc = 1;
 638     } else {
 639         cc = 2;
 640     }
 641
 642     if (srclen > destlen) {
 643         srclen = destlen;
 644     }
 645
 646     for (; destlen && srclen; src++, dest++, destlen--, srclen--) {
 647         v = cpu_ldub_data(env, src);
 648         cpu_stb_data(env, dest, v);
 649     }
 650
 651     for (; destlen; dest++, destlen--) {
 652         cpu_stb_data(env, dest, pad);
 653     }
 654
 655     env->regs[r1 + 1] = destlen;
 656     /* can't use srclen here, we trunc'ed it */
 657     /* FIXME: 31-bit mode! */
 658     env->regs[r3 + 1] -= src - env->regs[r3];
 659     env->regs[r1] = dest;
 660     env->regs[r3] = src;
 661
 662     return cc;
 663 }
 664
 665 /* compare logical long extended memcompare insn with padding */
 666 uint32_t HELPER(clcle)(CPUS390XState *env, uint32_t r1, uint64_t a2,
 667                        uint32_t r3)
 668 {
 669     uint64_t destlen = env->regs[r1 + 1];
 670     uint64_t dest = get_address_31fix(env, r1);
 671     uint64_t srclen = env->regs[r3 + 1];
 672     uint64_t src = get_address_31fix(env, r3);
 673     uint8_t pad = a2 & 0xff;
 674     uint8_t v1 = 0, v2 = 0;
 675     uint32_t cc = 0;
 676
 677     if (!(destlen || srclen)) {
 678         return cc;
 679     }
 680
 681     if (srclen > destlen) {
 682         srclen = destlen;
 683     }
 684
 685     for (; destlen || srclen; src++, dest++, destlen--, srclen--) {
 686         v1 = srclen ? cpu_ldub_data(env, src) : pad;
 687         v2 = destlen ? cpu_ldub_data(env, dest) : pad;
 688         if (v1 != v2) {
 689             cc = (v1 < v2) ? 1 : 2;
 690             break;
 691         }
 692     }
 693
 694     env->regs[r1 + 1] = destlen;
 695     /* can't use srclen here, we trunc'ed it */
 696     env->regs[r3 + 1] -= src - env->regs[r3];
 697     env->regs[r1] = dest;
 698     env->regs[r3] = src;
 699
 700     return cc;
 701 }
 702
 703 /* checksum */
 704 uint64_t HELPER(cksm)(CPUS390XState *env, uint64_t r1,
 705                       uint64_t src, uint64_t src_len)
 706 {
 707     uint64_t max_len, len;
 708     uint64_t cksm = (uint32_t)r1;
 709
 710     /* Lest we fail to service interrupts in a timely manner, limit the
 711        amount of work we're willing to do.  For now, let's cap at 8k.  */
 712     max_len = (src_len > 0x2000 ? 0x2000 : src_len);
 713
 714     /* Process full words as available.  */
 715     for (len = 0; len + 4 <= max_len; len += 4, src += 4) {
 716         cksm += (uint32_t)cpu_ldl_data(env, src);
 717     }
 718
 719     switch (max_len - len) {
 720     case 1:
 721         cksm += cpu_ldub_data(env, src) << 24;
 722         len += 1;
 723         break;
 724     case 2:
 725         cksm += cpu_lduw_data(env, src) << 16;
 726         len += 2;
 727         break;
 728     case 3:
 729         cksm += cpu_lduw_data(env, src) << 16;
 730         cksm += cpu_ldub_data(env, src + 2) << 8;
 731         len += 3;
 732         break;
 733     }
 734
 735     /* Fold the carry from the checksum.  Note that we can see carry-out
 736        during folding more than once (but probably not more than twice).  */
 737     while (cksm > 0xffffffffull) {
 738         cksm = (uint32_t)cksm + (cksm >> 32);
 739     }
 740
 741     /* Indicate whether or not we've processed everything.  */
 742     env->cc_op = (len == src_len ? 0 : 3);
 743
 744     /* Return both cksm and processed length.  */
 745     env->retxl = cksm;
 746     return len;
 747 }
 748
 749 void HELPER(unpk)(CPUS390XState *env, uint32_t len, uint64_t dest,
 750                   uint64_t src)
 751 {
 752     int len_dest = len >> 4;
 753     int len_src = len & 0xf;
 754     uint8_t b;
 755     int second_nibble = 0;
 756
 757     dest += len_dest;
 758     src += len_src;
 759
 760     /* last byte is special, it only flips the nibbles */
 761     b = cpu_ldub_data(env, src);
 762     cpu_stb_data(env, dest, (b << 4) | (b >> 4));
 763     src--;
 764     len_src--;
 765
 766     /* now pad every nibble with 0xf0 */
 767
 768     while (len_dest > 0) {
 769         uint8_t cur_byte = 0;
 770
 771         if (len_src > 0) {
 772             cur_byte = cpu_ldub_data(env, src);
 773         }
 774
 775         len_dest--;
 776         dest--;
 777
 778         /* only advance one nibble at a time */
 779         if (second_nibble) {
 780             cur_byte >>= 4;
 781             len_src--;
 782             src--;
 783         }
 784         second_nibble = !second_nibble;
 785
 786         /* digit */
 787         cur_byte = (cur_byte & 0xf);
 788         /* zone bits */
 789         cur_byte |= 0xf0;
 790
 791         cpu_stb_data(env, dest, cur_byte);
 792     }
 793 }
 794
 795 void HELPER(tr)(CPUS390XState *env, uint32_t len, uint64_t array,
 796                 uint64_t trans)
 797 {
 798     int i;
 799
 800     for (i = 0; i <= len; i++) {
 801         uint8_t byte = cpu_ldub_data(env, array + i);
 802         uint8_t new_byte = cpu_ldub_data(env, trans + byte);
 803
 804         cpu_stb_data(env, array + i, new_byte);
 805     }
 806 }
 807
 808 #if !defined(CONFIG_USER_ONLY)
 809 void HELPER(lctlg)(CPUS390XState *env, uint32_t r1, uint64_t a2, uint32_t r3)
 810 {
 811     int i;
 812     uint64_t src = a2;
 813
 814     for (i = r1;; i = (i + 1) % 16) {
 815         env->cregs[i] = cpu_ldq_data(env, src);
 816         HELPER_LOG("load ctl %d from 0x%" PRIx64 " == 0x%" PRIx64 "\n",
 817                    i, src, env->cregs[i]);
 818         src += sizeof(uint64_t);
 819
 820         if (i == r3) {
 821             break;
 822         }
 823     }
 824
 825     tlb_flush(env, 1);
 826 }
 827
 828 void HELPER(lctl)(CPUS390XState *env, uint32_t r1, uint64_t a2, uint32_t r3)
 829 {
 830     int i;
 831     uint64_t src = a2;
 832
 833     for (i = r1;; i = (i + 1) % 16) {
 834         env->cregs[i] = (env->cregs[i] & 0xFFFFFFFF00000000ULL) |
 835             cpu_ldl_data(env, src);
 836         src += sizeof(uint32_t);
 837
 838         if (i == r3) {
 839             break;
 840         }
 841     }
 842
 843     tlb_flush(env, 1);
 844 }
 845
 846 void HELPER(stctg)(CPUS390XState *env, uint32_t r1, uint64_t a2, uint32_t r3)
 847 {
 848     int i;
 849     uint64_t dest = a2;
 850
 851     for (i = r1;; i = (i + 1) % 16) {
 852         cpu_stq_data(env, dest, env->cregs[i]);
 853         dest += sizeof(uint64_t);
 854
 855         if (i == r3) {
 856             break;
 857         }
 858     }
 859 }
 860
 861 void HELPER(stctl)(CPUS390XState *env, uint32_t r1, uint64_t a2, uint32_t r3)
 862 {
 863     int i;
 864     uint64_t dest = a2;
 865
 866     for (i = r1;; i = (i + 1) % 16) {
 867         cpu_stl_data(env, dest, env->cregs[i]);
 868         dest += sizeof(uint32_t);
 869
 870         if (i == r3) {
 871             break;
 872         }
 873     }
 874 }
 875
 876 uint32_t HELPER(tprot)(uint64_t a1, uint64_t a2)
 877 {
 878     /* XXX implement */
 879
 880     return 0;
 881 }
 882
 883 /* insert storage key extended */
 884 uint64_t HELPER(iske)(CPUS390XState *env, uint64_t r2)
 885 {
 886     uint64_t addr = get_address(env, 0, 0, r2);
 887
 888     if (addr > ram_size) {
 889         return 0;
 890     }
 891
 892     return env->storage_keys[addr / TARGET_PAGE_SIZE];
 893 }
 894
 895 /* set storage key extended */
 896 void HELPER(sske)(CPUS390XState *env, uint64_t r1, uint64_t r2)
 897 {
 898     uint64_t addr = get_address(env, 0, 0, r2);
 899
 900     if (addr > ram_size) {
 901         return;
 902     }
 903
 904     env->storage_keys[addr / TARGET_PAGE_SIZE] = r1;
 905 }
 906
 907 /* reset reference bit extended */
 908 uint32_t HELPER(rrbe)(CPUS390XState *env, uint64_t r2)
 909 {
 910     uint8_t re;
 911     uint8_t key;
 912
 913     if (r2 > ram_size) {
 914         return 0;
 915     }
 916
 917     key = env->storage_keys[r2 / TARGET_PAGE_SIZE];
 918     re = key & (SK_R | SK_C);
 919     env->storage_keys[r2 / TARGET_PAGE_SIZE] = (key & ~SK_R);
 920
 921     /*
 922      * cc
 923      *
 924      * 0  Reference bit zero; change bit zero
 925      * 1  Reference bit zero; change bit one
 926      * 2  Reference bit one; change bit zero
 927      * 3  Reference bit one; change bit one
 928      */
 929
 930     return re >> 1;
 931 }
 932
 933 /* compare and swap and purge */
 934 uint32_t HELPER(csp)(CPUS390XState *env, uint32_t r1, uint64_t r2)
 935 {
 936     uint32_t cc;
 937     uint32_t o1 = env->regs[r1];
 938     uint64_t a2 = r2 & ~3ULL;
 939     uint32_t o2 = cpu_ldl_data(env, a2);
 940
 941     if (o1 == o2) {
 942         cpu_stl_data(env, a2, env->regs[(r1 + 1) & 15]);
 943         if (r2 & 0x3) {
 944             /* flush TLB / ALB */
 945             tlb_flush(env, 1);
 946         }
 947         cc = 0;
 948     } else {
 949         env->regs[r1] = (env->regs[r1] & 0xffffffff00000000ULL) | o2;
 950         cc = 1;
 951     }
 952
 953     return cc;
 954 }
 955
 956 static uint32_t mvc_asc(CPUS390XState *env, int64_t l, uint64_t a1,
 957                         uint64_t mode1, uint64_t a2, uint64_t mode2)
 958 {
 959     target_ulong src, dest;
 960     int flags, cc = 0, i;
 961
 962     if (!l) {
 963         return 0;
 964     } else if (l > 256) {
 965         /* max 256 */
 966         l = 256;
 967         cc = 3;
 968     }
 969
 970     if (mmu_translate(env, a1 & TARGET_PAGE_MASK, 1, mode1, &dest, &flags)) {
 971         cpu_loop_exit(env);
 972     }
 973     dest |= a1 & ~TARGET_PAGE_MASK;
 974
 975     if (mmu_translate(env, a2 & TARGET_PAGE_MASK, 0, mode2, &src, &flags)) {
 976         cpu_loop_exit(env);
 977     }
 978     src |= a2 & ~TARGET_PAGE_MASK;
 979
 980     /* XXX replace w/ memcpy */
 981     for (i = 0; i < l; i++) {
 982         /* XXX be more clever */
 983         if ((((dest + i) & TARGET_PAGE_MASK) != (dest & TARGET_PAGE_MASK)) ||
 984             (((src + i) & TARGET_PAGE_MASK) != (src & TARGET_PAGE_MASK))) {
 985             mvc_asc(env, l - i, a1 + i, mode1, a2 + i, mode2);
 986             break;
 987         }
 988         stb_phys(dest + i, ldub_phys(src + i));
 989     }
 990
 991     return cc;
 992 }
 993
 994 uint32_t HELPER(mvcs)(CPUS390XState *env, uint64_t l, uint64_t a1, uint64_t a2)
 995 {
 996     HELPER_LOG("%s: %16" PRIx64 " %16" PRIx64 " %16" PRIx64 "\n",
 997                __func__, l, a1, a2);
 998
 999     return mvc_asc(env, l, a1, PSW_ASC_SECONDARY, a2, PSW_ASC_PRIMARY);
1000 }
1001
1002 uint32_t HELPER(mvcp)(CPUS390XState *env, uint64_t l, uint64_t a1, uint64_t a2)
1003 {
1004     HELPER_LOG("%s: %16" PRIx64 " %16" PRIx64 " %16" PRIx64 "\n",
1005                __func__, l, a1, a2);
1006
1007     return mvc_asc(env, l, a1, PSW_ASC_PRIMARY, a2, PSW_ASC_SECONDARY);
1008 }
1009
1010 /* invalidate pte */
1011 void HELPER(ipte)(CPUS390XState *env, uint64_t pte_addr, uint64_t vaddr)
1012 {
1013     uint64_t page = vaddr & TARGET_PAGE_MASK;
1014     uint64_t pte = 0;
1015
1016     /* XXX broadcast to other CPUs */
1017
1018     /* XXX Linux is nice enough to give us the exact pte address.
1019        According to spec we'd have to find it out ourselves */
1020     /* XXX Linux is fine with overwriting the pte, the spec requires
1021        us to only set the invalid bit */
1022     stq_phys(pte_addr, pte | _PAGE_INVALID);
1023
1024     /* XXX we exploit the fact that Linux passes the exact virtual
1025        address here - it's not obliged to! */
1026     tlb_flush_page(env, page);
1027
1028     /* XXX 31-bit hack */
1029     if (page & 0x80000000) {
1030         tlb_flush_page(env, page & ~0x80000000);
1031     } else {
1032         tlb_flush_page(env, page | 0x80000000);
1033     }
1034 }
1035
1036 /* flush local tlb */
1037 void HELPER(ptlb)(CPUS390XState *env)
1038 {
1039     tlb_flush(env, 1);
1040 }
1041
1042 /* store using real address */
1043 void HELPER(stura)(CPUS390XState *env, uint64_t addr, uint64_t v1)
1044 {
1045     stw_phys(get_address(env, 0, 0, addr), (uint32_t)v1);
1046 }
1047
1048 /* load real address */
1049 uint64_t HELPER(lra)(CPUS390XState *env, uint64_t addr)
1050 {
1051     uint32_t cc = 0;
1052     int old_exc = env->exception_index;
1053     uint64_t asc = env->psw.mask & PSW_MASK_ASC;
1054     uint64_t ret;
1055     int flags;
1056
1057     /* XXX incomplete - has more corner cases */
1058     if (!(env->psw.mask & PSW_MASK_64) && (addr >> 32)) {
1059         program_interrupt(env, PGM_SPECIAL_OP, 2);
1060     }
1061
1062     env->exception_index = old_exc;
1063     if (mmu_translate(env, addr, 0, asc, &ret, &flags)) {
1064         cc = 3;
1065     }
1066     if (env->exception_index == EXCP_PGM) {
1067         ret = env->int_pgm_code | 0x80000000;
1068     } else {
1069         ret |= addr & ~TARGET_PAGE_MASK;
1070     }
1071     env->exception_index = old_exc;
1072
1073     env->cc_op = cc;
1074     return ret;
1075 }
1076 #endif