LXR qemu/target/i386/tcg/cc

   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 2.1 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 "qemu/osdep.h"
  21#include "cpu.h"
  22#include "exec/helper-proto.h"
  23#include "helper-tcg.h"
  24
  25const uint8_t parity_table[256] = {
  26    CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0,
  27    0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P,
  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    0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P,
  31    CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0,
  32    CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0,
  33    0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P,
  34    0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P,
  35    CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0,
  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    CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0,
  39    0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P,
  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    0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P,
  43    CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0,
  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    CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0,
  47    0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P,
  48    0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P,
  49    CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0,
  50    CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0,
  51    0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P,
  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    0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P,
  55    CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0,
  56    CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0,
  57    0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P,
  58};
  59
  60#define SHIFT 0
  61#include "cc_helper_template.h"
  62#undef SHIFT
  63
  64#define SHIFT 1
  65#include "cc_helper_template.h"
  66#undef SHIFT
  67
  68#define SHIFT 2
  69#include "cc_helper_template.h"
  70#undef SHIFT
  71
  72#ifdef TARGET_X86_64
  73
  74#define SHIFT 3
  75#include "cc_helper_template.h"
  76#undef SHIFT
  77
  78#endif
  79
  80static target_ulong compute_all_adcx(target_ulong dst, target_ulong src1,
  81                                     target_ulong src2)
  82{
  83    return (src1 & ~CC_C) | (dst * CC_C);
  84}
  85
  86static target_ulong compute_all_adox(target_ulong dst, target_ulong src1,
  87                                     target_ulong src2)
  88{
  89    return (src1 & ~CC_O) | (src2 * CC_O);
  90}
  91
  92static target_ulong compute_all_adcox(target_ulong dst, target_ulong src1,
  93                                      target_ulong src2)
  94{
  95    return (src1 & ~(CC_C | CC_O)) | (dst * CC_C) | (src2 * CC_O);
  96}
  97
  98target_ulong helper_cc_compute_all(target_ulong dst, target_ulong src1,
  99                                   target_ulong src2, int op)
 100{
 101    switch (op) {
 102    default: /* should never happen */
 103        return 0;
 104
 105    case CC_OP_EFLAGS:
 106        return src1;
 107    case CC_OP_CLR:
 108        return CC_Z | CC_P;
 109    case CC_OP_POPCNT:
 110        return src1 ? 0 : CC_Z;
 111
 112    case CC_OP_MULB:
 113        return compute_all_mulb(dst, src1);
 114    case CC_OP_MULW:
 115        return compute_all_mulw(dst, src1);
 116    case CC_OP_MULL:
 117        return compute_all_mull(dst, src1);
 118
 119    case CC_OP_ADDB:
 120        return compute_all_addb(dst, src1);
 121    case CC_OP_ADDW:
 122        return compute_all_addw(dst, src1);
 123    case CC_OP_ADDL:
 124        return compute_all_addl(dst, src1);
 125
 126    case CC_OP_ADCB:
 127        return compute_all_adcb(dst, src1, src2);
 128    case CC_OP_ADCW:
 129        return compute_all_adcw(dst, src1, src2);
 130    case CC_OP_ADCL:
 131        return compute_all_adcl(dst, src1, src2);
 132
 133    case CC_OP_SUBB:
 134        return compute_all_subb(dst, src1);
 135    case CC_OP_SUBW:
 136        return compute_all_subw(dst, src1);
 137    case CC_OP_SUBL:
 138        return compute_all_subl(dst, src1);
 139
 140    case CC_OP_SBBB:
 141        return compute_all_sbbb(dst, src1, src2);
 142    case CC_OP_SBBW:
 143        return compute_all_sbbw(dst, src1, src2);
 144    case CC_OP_SBBL:
 145        return compute_all_sbbl(dst, src1, src2);
 146
 147    case CC_OP_LOGICB:
 148        return compute_all_logicb(dst, src1);
 149    case CC_OP_LOGICW:
 150        return compute_all_logicw(dst, src1);
 151    case CC_OP_LOGICL:
 152        return compute_all_logicl(dst, src1);
 153
 154    case CC_OP_INCB:
 155        return compute_all_incb(dst, src1);
 156    case CC_OP_INCW:
 157        return compute_all_incw(dst, src1);
 158    case CC_OP_INCL:
 159        return compute_all_incl(dst, src1);
 160
 161    case CC_OP_DECB:
 162        return compute_all_decb(dst, src1);
 163    case CC_OP_DECW:
 164        return compute_all_decw(dst, src1);
 165    case CC_OP_DECL:
 166        return compute_all_decl(dst, src1);
 167
 168    case CC_OP_SHLB:
 169        return compute_all_shlb(dst, src1);
 170    case CC_OP_SHLW:
 171        return compute_all_shlw(dst, src1);
 172    case CC_OP_SHLL:
 173        return compute_all_shll(dst, src1);
 174
 175    case CC_OP_SARB:
 176        return compute_all_sarb(dst, src1);
 177    case CC_OP_SARW:
 178        return compute_all_sarw(dst, src1);
 179    case CC_OP_SARL:
 180        return compute_all_sarl(dst, src1);
 181
 182    case CC_OP_BMILGB:
 183        return compute_all_bmilgb(dst, src1);
 184    case CC_OP_BMILGW:
 185        return compute_all_bmilgw(dst, src1);
 186    case CC_OP_BMILGL:
 187        return compute_all_bmilgl(dst, src1);
 188
 189    case CC_OP_ADCX:
 190        return compute_all_adcx(dst, src1, src2);
 191    case CC_OP_ADOX:
 192        return compute_all_adox(dst, src1, src2);
 193    case CC_OP_ADCOX:
 194        return compute_all_adcox(dst, src1, src2);
 195
 196#ifdef TARGET_X86_64
 197    case CC_OP_MULQ:
 198        return compute_all_mulq(dst, src1);
 199    case CC_OP_ADDQ:
 200        return compute_all_addq(dst, src1);
 201    case CC_OP_ADCQ:
 202        return compute_all_adcq(dst, src1, src2);
 203    case CC_OP_SUBQ:
 204        return compute_all_subq(dst, src1);
 205    case CC_OP_SBBQ:
 206        return compute_all_sbbq(dst, src1, src2);
 207    case CC_OP_LOGICQ:
 208        return compute_all_logicq(dst, src1);
 209    case CC_OP_INCQ:
 210        return compute_all_incq(dst, src1);
 211    case CC_OP_DECQ:
 212        return compute_all_decq(dst, src1);
 213    case CC_OP_SHLQ:
 214        return compute_all_shlq(dst, src1);
 215    case CC_OP_SARQ:
 216        return compute_all_sarq(dst, src1);
 217    case CC_OP_BMILGQ:
 218        return compute_all_bmilgq(dst, src1);
 219#endif
 220    }
 221}
 222
 223uint32_t cpu_cc_compute_all(CPUX86State *env, int op)
 224{
 225    return helper_cc_compute_all(CC_DST, CC_SRC, CC_SRC2, op);
 226}
 227
 228target_ulong helper_cc_compute_c(target_ulong dst, target_ulong src1,
 229                                 target_ulong src2, int op)
 230{
 231    switch (op) {
 232    default: /* should never happen */
 233    case CC_OP_LOGICB:
 234    case CC_OP_LOGICW:
 235    case CC_OP_LOGICL:
 236    case CC_OP_LOGICQ:
 237    case CC_OP_CLR:
 238    case CC_OP_POPCNT:
 239        return 0;
 240
 241    case CC_OP_EFLAGS:
 242    case CC_OP_SARB:
 243    case CC_OP_SARW:
 244    case CC_OP_SARL:
 245    case CC_OP_SARQ:
 246    case CC_OP_ADOX:
 247        return src1 & 1;
 248
 249    case CC_OP_INCB:
 250    case CC_OP_INCW:
 251    case CC_OP_INCL:
 252    case CC_OP_INCQ:
 253    case CC_OP_DECB:
 254    case CC_OP_DECW:
 255    case CC_OP_DECL:
 256    case CC_OP_DECQ:
 257        return src1;
 258
 259    case CC_OP_MULB:
 260    case CC_OP_MULW:
 261    case CC_OP_MULL:
 262    case CC_OP_MULQ:
 263        return src1 != 0;
 264
 265    case CC_OP_ADCX:
 266    case CC_OP_ADCOX:
 267        return dst;
 268
 269    case CC_OP_ADDB:
 270        return compute_c_addb(dst, src1);
 271    case CC_OP_ADDW:
 272        return compute_c_addw(dst, src1);
 273    case CC_OP_ADDL:
 274        return compute_c_addl(dst, src1);
 275
 276    case CC_OP_ADCB:
 277        return compute_c_adcb(dst, src1, src2);
 278    case CC_OP_ADCW:
 279        return compute_c_adcw(dst, src1, src2);
 280    case CC_OP_ADCL:
 281        return compute_c_adcl(dst, src1, src2);
 282
 283    case CC_OP_SUBB:
 284        return compute_c_subb(dst, src1);
 285    case CC_OP_SUBW:
 286        return compute_c_subw(dst, src1);
 287    case CC_OP_SUBL:
 288        return compute_c_subl(dst, src1);
 289
 290    case CC_OP_SBBB:
 291        return compute_c_sbbb(dst, src1, src2);
 292    case CC_OP_SBBW:
 293        return compute_c_sbbw(dst, src1, src2);
 294    case CC_OP_SBBL:
 295        return compute_c_sbbl(dst, src1, src2);
 296
 297    case CC_OP_SHLB:
 298        return compute_c_shlb(dst, src1);
 299    case CC_OP_SHLW:
 300        return compute_c_shlw(dst, src1);
 301    case CC_OP_SHLL:
 302        return compute_c_shll(dst, src1);
 303
 304    case CC_OP_BMILGB:
 305        return compute_c_bmilgb(dst, src1);
 306    case CC_OP_BMILGW:
 307        return compute_c_bmilgw(dst, src1);
 308    case CC_OP_BMILGL:
 309        return compute_c_bmilgl(dst, src1);
 310
 311#ifdef TARGET_X86_64
 312    case CC_OP_ADDQ:
 313        return compute_c_addq(dst, src1);
 314    case CC_OP_ADCQ:
 315        return compute_c_adcq(dst, src1, src2);
 316    case CC_OP_SUBQ:
 317        return compute_c_subq(dst, src1);
 318    case CC_OP_SBBQ:
 319        return compute_c_sbbq(dst, src1, src2);
 320    case CC_OP_SHLQ:
 321        return compute_c_shlq(dst, src1);
 322    case CC_OP_BMILGQ:
 323        return compute_c_bmilgq(dst, src1);
 324#endif
 325    }
 326}
 327
 328void helper_write_eflags(CPUX86State *env, target_ulong t0,
 329                         uint32_t update_mask)
 330{
 331    cpu_load_eflags(env, t0, update_mask);
 332}
 333
 334target_ulong helper_read_eflags(CPUX86State *env)
 335{
 336    uint32_t eflags;
 337
 338    eflags = cpu_cc_compute_all(env, CC_OP);
 339    eflags |= (env->df & DF_MASK);
 340    eflags |= env->eflags & ~(VM_MASK | RF_MASK);
 341    return eflags;
 342}
 343
 344void helper_clts(CPUX86State *env)
 345{
 346    env->cr[0] &= ~CR0_TS_MASK;
 347    env->hflags &= ~HF_TS_MASK;
 348}
 349