target-i386/helper_template.h

   1 /*
   2  *  i386 helpers
   3  *
   4  *  Copyright (c) 2008 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, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA  02110-1301 USA
  19  */
  20 #define DATA_BITS (1 << (3 + SHIFT))
  21 #define SHIFT_MASK (DATA_BITS - 1)
  22 #define SIGN_MASK (((target_ulong)1) << (DATA_BITS - 1))
  23 #if DATA_BITS <= 32
  24 #define SHIFT1_MASK 0x1f
  25 #else
  26 #define SHIFT1_MASK 0x3f
  27 #endif
  28
  29 #if DATA_BITS == 8
  30 #define SUFFIX b
  31 #define DATA_TYPE uint8_t
  32 #define DATA_STYPE int8_t
  33 #define DATA_MASK 0xff
  34 #elif DATA_BITS == 16
  35 #define SUFFIX w
  36 #define DATA_TYPE uint16_t
  37 #define DATA_STYPE int16_t
  38 #define DATA_MASK 0xffff
  39 #elif DATA_BITS == 32
  40 #define SUFFIX l
  41 #define DATA_TYPE uint32_t
  42 #define DATA_STYPE int32_t
  43 #define DATA_MASK 0xffffffff
  44 #elif DATA_BITS == 64
  45 #define SUFFIX q
  46 #define DATA_TYPE uint64_t
  47 #define DATA_STYPE int64_t
  48 #define DATA_MASK 0xffffffffffffffffULL
  49 #else
  50 #error unhandled operand size
  51 #endif
  52
  53 /* dynamic flags computation */
  54
  55 static int glue(compute_all_add, SUFFIX)(void)
  56 {
  57     int cf, pf, af, zf, sf, of;
  58     target_long src1, src2;
  59     src1 = CC_SRC;
  60     src2 = CC_DST - CC_SRC;
  61     cf = (DATA_TYPE)CC_DST < (DATA_TYPE)src1;
  62     pf = parity_table[(uint8_t)CC_DST];
  63     af = (CC_DST ^ src1 ^ src2) & 0x10;
  64     zf = ((DATA_TYPE)CC_DST == 0) << 6;
  65     sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80;
  66     of = lshift((src1 ^ src2 ^ -1) & (src1 ^ CC_DST), 12 - DATA_BITS) & CC_O;
  67     return cf | pf | af | zf | sf | of;
  68 }
  69
  70 static int glue(compute_c_add, SUFFIX)(void)
  71 {
  72     int cf;
  73     target_long src1;
  74     src1 = CC_SRC;
  75     cf = (DATA_TYPE)CC_DST < (DATA_TYPE)src1;
  76     return cf;
  77 }
  78
  79 static int glue(compute_all_adc, SUFFIX)(void)
  80 {
  81     int cf, pf, af, zf, sf, of;
  82     target_long src1, src2;
  83     src1 = CC_SRC;
  84     src2 = CC_DST - CC_SRC - 1;
  85     cf = (DATA_TYPE)CC_DST <= (DATA_TYPE)src1;
  86     pf = parity_table[(uint8_t)CC_DST];
  87     af = (CC_DST ^ src1 ^ src2) & 0x10;
  88     zf = ((DATA_TYPE)CC_DST == 0) << 6;
  89     sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80;
  90     of = lshift((src1 ^ src2 ^ -1) & (src1 ^ CC_DST), 12 - DATA_BITS) & CC_O;
  91     return cf | pf | af | zf | sf | of;
  92 }
  93
  94 static int glue(compute_c_adc, SUFFIX)(void)
  95 {
  96     int cf;
  97     target_long src1;
  98     src1 = CC_SRC;
  99     cf = (DATA_TYPE)CC_DST <= (DATA_TYPE)src1;
 100     return cf;
 101 }
 102
 103 static int glue(compute_all_sub, SUFFIX)(void)
 104 {
 105     int cf, pf, af, zf, sf, of;
 106     target_long src1, src2;
 107     src1 = CC_DST + CC_SRC;
 108     src2 = CC_SRC;
 109     cf = (DATA_TYPE)src1 < (DATA_TYPE)src2;
 110     pf = parity_table[(uint8_t)CC_DST];
 111     af = (CC_DST ^ src1 ^ src2) & 0x10;
 112     zf = ((DATA_TYPE)CC_DST == 0) << 6;
 113     sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80;
 114     of = lshift((src1 ^ src2) & (src1 ^ CC_DST), 12 - DATA_BITS) & CC_O;
 115     return cf | pf | af | zf | sf | of;
 116 }
 117
 118 static int glue(compute_c_sub, SUFFIX)(void)
 119 {
 120     int cf;
 121     target_long src1, src2;
 122     src1 = CC_DST + CC_SRC;
 123     src2 = CC_SRC;
 124     cf = (DATA_TYPE)src1 < (DATA_TYPE)src2;
 125     return cf;
 126 }
 127
 128 static int glue(compute_all_sbb, SUFFIX)(void)
 129 {
 130     int cf, pf, af, zf, sf, of;
 131     target_long src1, src2;
 132     src1 = CC_DST + CC_SRC + 1;
 133     src2 = CC_SRC;
 134     cf = (DATA_TYPE)src1 <= (DATA_TYPE)src2;
 135     pf = parity_table[(uint8_t)CC_DST];
 136     af = (CC_DST ^ src1 ^ src2) & 0x10;
 137     zf = ((DATA_TYPE)CC_DST == 0) << 6;
 138     sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80;
 139     of = lshift((src1 ^ src2) & (src1 ^ CC_DST), 12 - DATA_BITS) & CC_O;
 140     return cf | pf | af | zf | sf | of;
 141 }
 142
 143 static int glue(compute_c_sbb, SUFFIX)(void)
 144 {
 145     int cf;
 146     target_long src1, src2;
 147     src1 = CC_DST + CC_SRC + 1;
 148     src2 = CC_SRC;
 149     cf = (DATA_TYPE)src1 <= (DATA_TYPE)src2;
 150     return cf;
 151 }
 152
 153 static int glue(compute_all_logic, SUFFIX)(void)
 154 {
 155     int cf, pf, af, zf, sf, of;
 156     cf = 0;
 157     pf = parity_table[(uint8_t)CC_DST];
 158     af = 0;
 159     zf = ((DATA_TYPE)CC_DST == 0) << 6;
 160     sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80;
 161     of = 0;
 162     return cf | pf | af | zf | sf | of;
 163 }
 164
 165 static int glue(compute_c_logic, SUFFIX)(void)
 166 {
 167     return 0;
 168 }
 169
 170 static int glue(compute_all_inc, SUFFIX)(void)
 171 {
 172     int cf, pf, af, zf, sf, of;
 173     target_long src1, src2;
 174     src1 = CC_DST - 1;
 175     src2 = 1;
 176     cf = CC_SRC;
 177     pf = parity_table[(uint8_t)CC_DST];
 178     af = (CC_DST ^ src1 ^ src2) & 0x10;
 179     zf = ((DATA_TYPE)CC_DST == 0) << 6;
 180     sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80;
 181     of = ((CC_DST & DATA_MASK) == SIGN_MASK) << 11;
 182     return cf | pf | af | zf | sf | of;
 183 }
 184
 185 #if DATA_BITS == 32
 186 static int glue(compute_c_inc, SUFFIX)(void)
 187 {
 188     return CC_SRC;
 189 }
 190 #endif
 191
 192 static int glue(compute_all_dec, SUFFIX)(void)
 193 {
 194     int cf, pf, af, zf, sf, of;
 195     target_long src1, src2;
 196     src1 = CC_DST + 1;
 197     src2 = 1;
 198     cf = CC_SRC;
 199     pf = parity_table[(uint8_t)CC_DST];
 200     af = (CC_DST ^ src1 ^ src2) & 0x10;
 201     zf = ((DATA_TYPE)CC_DST == 0) << 6;
 202     sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80;
 203     of = ((CC_DST & DATA_MASK) == ((target_ulong)SIGN_MASK - 1)) << 11;
 204     return cf | pf | af | zf | sf | of;
 205 }
 206
 207 static int glue(compute_all_shl, SUFFIX)(void)
 208 {
 209     int cf, pf, af, zf, sf, of;
 210     cf = (CC_SRC >> (DATA_BITS - 1)) & CC_C;
 211     pf = parity_table[(uint8_t)CC_DST];
 212     af = 0; /* undefined */
 213     zf = ((DATA_TYPE)CC_DST == 0) << 6;
 214     sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80;
 215     /* of is defined if shift count == 1 */
 216     of = lshift(CC_SRC ^ CC_DST, 12 - DATA_BITS) & CC_O;
 217     return cf | pf | af | zf | sf | of;
 218 }
 219
 220 static int glue(compute_c_shl, SUFFIX)(void)
 221 {
 222     return (CC_SRC >> (DATA_BITS - 1)) & CC_C;
 223 }
 224
 225 #if DATA_BITS == 32
 226 static int glue(compute_c_sar, SUFFIX)(void)
 227 {
 228     return CC_SRC & 1;
 229 }
 230 #endif
 231
 232 static int glue(compute_all_sar, SUFFIX)(void)
 233 {
 234     int cf, pf, af, zf, sf, of;
 235     cf = CC_SRC & 1;
 236     pf = parity_table[(uint8_t)CC_DST];
 237     af = 0; /* undefined */
 238     zf = ((DATA_TYPE)CC_DST == 0) << 6;
 239     sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80;
 240     /* of is defined if shift count == 1 */
 241     of = lshift(CC_SRC ^ CC_DST, 12 - DATA_BITS) & CC_O;
 242     return cf | pf | af | zf | sf | of;
 243 }
 244
 245 #if DATA_BITS == 32
 246 static int glue(compute_c_mul, SUFFIX)(void)
 247 {
 248     int cf;
 249     cf = (CC_SRC != 0);
 250     return cf;
 251 }
 252 #endif
 253
 254 /* NOTE: we compute the flags like the P4. On olders CPUs, only OF and
 255    CF are modified and it is slower to do that. */
 256 static int glue(compute_all_mul, SUFFIX)(void)
 257 {
 258     int cf, pf, af, zf, sf, of;
 259     cf = (CC_SRC != 0);
 260     pf = parity_table[(uint8_t)CC_DST];
 261     af = 0; /* undefined */
 262     zf = ((DATA_TYPE)CC_DST == 0) << 6;
 263     sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80;
 264     of = cf << 11;
 265     return cf | pf | af | zf | sf | of;
 266 }
 267
 268 /* shifts */
 269
 270 target_ulong glue(helper_rcl, SUFFIX)(target_ulong t0, target_ulong t1)
 271 {
 272     int count, eflags;
 273     target_ulong src;
 274     target_long res;
 275
 276     count = t1 & SHIFT1_MASK;
 277 #if DATA_BITS == 16
 278     count = rclw_table[count];
 279 #elif DATA_BITS == 8
 280     count = rclb_table[count];
 281 #endif
 282     if (count) {
 283         eflags = helper_cc_compute_all(CC_OP);
 284         t0 &= DATA_MASK;
 285         src = t0;
 286         res = (t0 << count) | ((target_ulong)(eflags & CC_C) << (count - 1));
 287         if (count > 1)
 288             res |= t0 >> (DATA_BITS + 1 - count);
 289         t0 = res;
 290         env->cc_tmp = (eflags & ~(CC_C | CC_O)) |
 291             (lshift(src ^ t0, 11 - (DATA_BITS - 1)) & CC_O) |
 292             ((src >> (DATA_BITS - count)) & CC_C);
 293     } else {
 294         env->cc_tmp = -1;
 295     }
 296     return t0;
 297 }
 298
 299 target_ulong glue(helper_rcr, SUFFIX)(target_ulong t0, target_ulong t1)
 300 {
 301     int count, eflags;
 302     target_ulong src;
 303     target_long res;
 304
 305     count = t1 & SHIFT1_MASK;
 306 #if DATA_BITS == 16
 307     count = rclw_table[count];
 308 #elif DATA_BITS == 8
 309     count = rclb_table[count];
 310 #endif
 311     if (count) {
 312         eflags = helper_cc_compute_all(CC_OP);
 313         t0 &= DATA_MASK;
 314         src = t0;
 315         res = (t0 >> count) | ((target_ulong)(eflags & CC_C) << (DATA_BITS - count));
 316         if (count > 1)
 317             res |= t0 << (DATA_BITS + 1 - count);
 318         t0 = res;
 319         env->cc_tmp = (eflags & ~(CC_C | CC_O)) |
 320             (lshift(src ^ t0, 11 - (DATA_BITS - 1)) & CC_O) |
 321             ((src >> (count - 1)) & CC_C);
 322     } else {
 323         env->cc_tmp = -1;
 324     }
 325     return t0;
 326 }
 327
 328 #undef DATA_BITS
 329 #undef SHIFT_MASK
 330 #undef SHIFT1_MASK
 331 #undef SIGN_MASK
 332 #undef DATA_TYPE
 333 #undef DATA_STYPE
 334 #undef DATA_MASK
 335 #undef SUFFIX