target-i386/cc_helper.c

   1 /*
   2  *  x86 condition code helpers
   3  *
   4  *  Copyright (c) 2003 Fabrice Bellard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "cpu.h"
  21 #include "helper.h"
  22
  23 const uint8_t parity_table[256] = {
  24     CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0,
  25     0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P,
  26     0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P,
  27     CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0,
  28     0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P,
  29     CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0,
  30     CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0,
  31     0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P,
  32     0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P,
  33     CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0,
  34     CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0,
  35     0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P,
  36     CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0,
  37     0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P,
  38     0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P,
  39     CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0,
  40     0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P,
  41     CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0,
  42     CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0,
  43     0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P,
  44     CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0,
  45     0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P,
  46     0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P,
  47     CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0,
  48     CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0,
  49     0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P,
  50     0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P,
  51     CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0,
  52     0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P,
  53     CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0,
  54     CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0,
  55     0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P,
  56 };
  57
  58 #define SHIFT 0
  59 #include "cc_helper_template.h"
  60 #undef SHIFT
  61
  62 #define SHIFT 1
  63 #include "cc_helper_template.h"
  64 #undef SHIFT
  65
  66 #define SHIFT 2
  67 #include "cc_helper_template.h"
  68 #undef SHIFT
  69
  70 #ifdef TARGET_X86_64
  71
  72 #define SHIFT 3
  73 #include "cc_helper_template.h"
  74 #undef SHIFT
  75
  76 #endif
  77
  78 static target_ulong compute_all_adcx(target_ulong dst, target_ulong src1,
  79                                      target_ulong src2)
  80 {
  81     return (src1 & ~CC_C) | (dst * CC_C);
  82 }
  83
  84 static target_ulong compute_all_adox(target_ulong dst, target_ulong src1,
  85                                      target_ulong src2)
  86 {
  87     return (src1 & ~CC_O) | (src2 * CC_O);
  88 }
  89
  90 static target_ulong compute_all_adcox(target_ulong dst, target_ulong src1,
  91                                       target_ulong src2)
  92 {
  93     return (src1 & ~(CC_C | CC_O)) | (dst * CC_C) | (src2 * CC_O);
  94 }
  95
  96 target_ulong helper_cc_compute_all(target_ulong dst, target_ulong src1,
  97                                    target_ulong src2, int op)
  98 {
  99     switch (op) {
 100     default: /* should never happen */
 101         return 0;
 102
 103     case CC_OP_EFLAGS:
 104         return src1;
 105     case CC_OP_CLR:
 106         return CC_Z;
 107
 108     case CC_OP_MULB:
 109         return compute_all_mulb(dst, src1);
 110     case CC_OP_MULW:
 111         return compute_all_mulw(dst, src1);
 112     case CC_OP_MULL:
 113         return compute_all_mull(dst, src1);
 114
 115     case CC_OP_ADDB:
 116         return compute_all_addb(dst, src1);
 117     case CC_OP_ADDW:
 118         return compute_all_addw(dst, src1);
 119     case CC_OP_ADDL:
 120         return compute_all_addl(dst, src1);
 121
 122     case CC_OP_ADCB:
 123         return compute_all_adcb(dst, src1, src2);
 124     case CC_OP_ADCW:
 125         return compute_all_adcw(dst, src1, src2);
 126     case CC_OP_ADCL:
 127         return compute_all_adcl(dst, src1, src2);
 128
 129     case CC_OP_SUBB:
 130         return compute_all_subb(dst, src1);
 131     case CC_OP_SUBW:
 132         return compute_all_subw(dst, src1);
 133     case CC_OP_SUBL:
 134         return compute_all_subl(dst, src1);
 135
 136     case CC_OP_SBBB:
 137         return compute_all_sbbb(dst, src1, src2);
 138     case CC_OP_SBBW:
 139         return compute_all_sbbw(dst, src1, src2);
 140     case CC_OP_SBBL:
 141         return compute_all_sbbl(dst, src1, src2);
 142
 143     case CC_OP_LOGICB:
 144         return compute_all_logicb(dst, src1);
 145     case CC_OP_LOGICW:
 146         return compute_all_logicw(dst, src1);
 147     case CC_OP_LOGICL:
 148         return compute_all_logicl(dst, src1);
 149
 150     case CC_OP_INCB:
 151         return compute_all_incb(dst, src1);
 152     case CC_OP_INCW:
 153         return compute_all_incw(dst, src1);
 154     case CC_OP_INCL:
 155         return compute_all_incl(dst, src1);
 156
 157     case CC_OP_DECB:
 158         return compute_all_decb(dst, src1);
 159     case CC_OP_DECW:
 160         return compute_all_decw(dst, src1);
 161     case CC_OP_DECL:
 162         return compute_all_decl(dst, src1);
 163
 164     case CC_OP_SHLB:
 165         return compute_all_shlb(dst, src1);
 166     case CC_OP_SHLW:
 167         return compute_all_shlw(dst, src1);
 168     case CC_OP_SHLL:
 169         return compute_all_shll(dst, src1);
 170
 171     case CC_OP_SARB:
 172         return compute_all_sarb(dst, src1);
 173     case CC_OP_SARW:
 174         return compute_all_sarw(dst, src1);
 175     case CC_OP_SARL:
 176         return compute_all_sarl(dst, src1);
 177
 178     case CC_OP_BMILGB:
 179         return compute_all_bmilgb(dst, src1);
 180     case CC_OP_BMILGW:
 181         return compute_all_bmilgw(dst, src1);
 182     case CC_OP_BMILGL:
 183         return compute_all_bmilgl(dst, src1);
 184
 185     case CC_OP_ADCX:
 186         return compute_all_adcx(dst, src1, src2);
 187     case CC_OP_ADOX:
 188         return compute_all_adox(dst, src1, src2);
 189     case CC_OP_ADCOX:
 190         return compute_all_adcox(dst, src1, src2);
 191
 192 #ifdef TARGET_X86_64
 193     case CC_OP_MULQ:
 194         return compute_all_mulq(dst, src1);
 195     case CC_OP_ADDQ:
 196         return compute_all_addq(dst, src1);
 197     case CC_OP_ADCQ:
 198         return compute_all_adcq(dst, src1, src2);
 199     case CC_OP_SUBQ:
 200         return compute_all_subq(dst, src1);
 201     case CC_OP_SBBQ:
 202         return compute_all_sbbq(dst, src1, src2);
 203     case CC_OP_LOGICQ:
 204         return compute_all_logicq(dst, src1);
 205     case CC_OP_INCQ:
 206         return compute_all_incq(dst, src1);
 207     case CC_OP_DECQ:
 208         return compute_all_decq(dst, src1);
 209     case CC_OP_SHLQ:
 210         return compute_all_shlq(dst, src1);
 211     case CC_OP_SARQ:
 212         return compute_all_sarq(dst, src1);
 213     case CC_OP_BMILGQ:
 214         return compute_all_bmilgq(dst, src1);
 215 #endif
 216     }
 217 }
 218
 219 uint32_t cpu_cc_compute_all(CPUX86State *env, int op)
 220 {
 221     return helper_cc_compute_all(CC_DST, CC_SRC, CC_SRC2, op);
 222 }
 223
 224 target_ulong helper_cc_compute_c(target_ulong dst, target_ulong src1,
 225                                  target_ulong src2, int op)
 226 {
 227     switch (op) {
 228     default: /* should never happen */
 229     case CC_OP_LOGICB:
 230     case CC_OP_LOGICW:
 231     case CC_OP_LOGICL:
 232     case CC_OP_LOGICQ:
 233     case CC_OP_CLR:
 234         return 0;
 235
 236     case CC_OP_EFLAGS:
 237     case CC_OP_SARB:
 238     case CC_OP_SARW:
 239     case CC_OP_SARL:
 240     case CC_OP_SARQ:
 241     case CC_OP_ADOX:
 242         return src1 & 1;
 243
 244     case CC_OP_INCB:
 245     case CC_OP_INCW:
 246     case CC_OP_INCL:
 247     case CC_OP_INCQ:
 248     case CC_OP_DECB:
 249     case CC_OP_DECW:
 250     case CC_OP_DECL:
 251     case CC_OP_DECQ:
 252         return src1;
 253
 254     case CC_OP_MULB:
 255     case CC_OP_MULW:
 256     case CC_OP_MULL:
 257     case CC_OP_MULQ:
 258         return src1 != 0;
 259
 260     case CC_OP_ADCX:
 261     case CC_OP_ADCOX:
 262         return dst;
 263
 264     case CC_OP_ADDB:
 265         return compute_c_addb(dst, src1);
 266     case CC_OP_ADDW:
 267         return compute_c_addw(dst, src1);
 268     case CC_OP_ADDL:
 269         return compute_c_addl(dst, src1);
 270
 271     case CC_OP_ADCB:
 272         return compute_c_adcb(dst, src1, src2);
 273     case CC_OP_ADCW:
 274         return compute_c_adcw(dst, src1, src2);
 275     case CC_OP_ADCL:
 276         return compute_c_adcl(dst, src1, src2);
 277
 278     case CC_OP_SUBB:
 279         return compute_c_subb(dst, src1);
 280     case CC_OP_SUBW:
 281         return compute_c_subw(dst, src1);
 282     case CC_OP_SUBL:
 283         return compute_c_subl(dst, src1);
 284
 285     case CC_OP_SBBB:
 286         return compute_c_sbbb(dst, src1, src2);
 287     case CC_OP_SBBW:
 288         return compute_c_sbbw(dst, src1, src2);
 289     case CC_OP_SBBL:
 290         return compute_c_sbbl(dst, src1, src2);
 291
 292     case CC_OP_SHLB:
 293         return compute_c_shlb(dst, src1);
 294     case CC_OP_SHLW:
 295         return compute_c_shlw(dst, src1);
 296     case CC_OP_SHLL:
 297         return compute_c_shll(dst, src1);
 298
 299     case CC_OP_BMILGB:
 300         return compute_c_bmilgb(dst, src1);
 301     case CC_OP_BMILGW:
 302         return compute_c_bmilgw(dst, src1);
 303     case CC_OP_BMILGL:
 304         return compute_c_bmilgl(dst, src1);
 305
 306 #ifdef TARGET_X86_64
 307     case CC_OP_ADDQ:
 308         return compute_c_addq(dst, src1);
 309     case CC_OP_ADCQ:
 310         return compute_c_adcq(dst, src1, src2);
 311     case CC_OP_SUBQ:
 312         return compute_c_subq(dst, src1);
 313     case CC_OP_SBBQ:
 314         return compute_c_sbbq(dst, src1, src2);
 315     case CC_OP_SHLQ:
 316         return compute_c_shlq(dst, src1);
 317     case CC_OP_BMILGQ:
 318         return compute_c_bmilgq(dst, src1);
 319 #endif
 320     }
 321 }
 322
 323 void helper_write_eflags(CPUX86State *env, target_ulong t0,
 324                          uint32_t update_mask)
 325 {
 326     cpu_load_eflags(env, t0, update_mask);
 327 }
 328
 329 target_ulong helper_read_eflags(CPUX86State *env)
 330 {
 331     uint32_t eflags;
 332
 333     eflags = cpu_cc_compute_all(env, CC_OP);
 334     eflags |= (DF & DF_MASK);
 335     eflags |= env->eflags & ~(VM_MASK | RF_MASK);
 336     return eflags;
 337 }
 338
 339 void helper_clts(CPUX86State *env)
 340 {
 341     env->cr[0] &= ~CR0_TS_MASK;
 342     env->hflags &= ~HF_TS_MASK;
 343 }
 344
 345 void helper_reset_rf(CPUX86State *env)
 346 {
 347     env->eflags &= ~RF_MASK;
 348 }
 349
 350 void helper_cli(CPUX86State *env)
 351 {
 352     env->eflags &= ~IF_MASK;
 353 }
 354
 355 void helper_sti(CPUX86State *env)
 356 {
 357     env->eflags |= IF_MASK;
 358 }
 359
 360 void helper_clac(CPUX86State *env)
 361 {
 362     env->eflags &= ~AC_MASK;
 363 }
 364
 365 void helper_stac(CPUX86State *env)
 366 {
 367     env->eflags |= AC_MASK;
 368 }
 369
 370 #if 0
 371 /* vm86plus instructions */
 372 void helper_cli_vm(CPUX86State *env)
 373 {
 374     env->eflags &= ~VIF_MASK;
 375 }
 376
 377 void helper_sti_vm(CPUX86State *env)
 378 {
 379     env->eflags |= VIF_MASK;
 380     if (env->eflags & VIP_MASK) {
 381         raise_exception(env, EXCP0D_GPF);
 382     }
 383 }
 384 #endif
 385
 386 void helper_set_inhibit_irq(CPUX86State *env)
 387 {
 388     env->hflags |= HF_INHIBIT_IRQ_MASK;
 389 }
 390
 391 void helper_reset_inhibit_irq(CPUX86State *env)
 392 {
 393     env->hflags &= ~HF_INHIBIT_IRQ_MASK;
 394 }