target-i386/exec.h

   1 /*
   2  *  i386 execution defines
   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, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA  02110-1301 USA
  19  */
  20 #include "config.h"
  21 #include "dyngen-exec.h"
  22
  23 /* XXX: factorize this mess */
  24 #ifdef TARGET_X86_64
  25 #define TARGET_LONG_BITS 64
  26 #else
  27 #define TARGET_LONG_BITS 32
  28 #endif
  29
  30 #include "cpu-defs.h"
  31
  32 register struct CPUX86State *env asm(AREG0);
  33
  34 #include "qemu-common.h"
  35 #include "qemu-log.h"
  36
  37 #define EAX (env->regs[R_EAX])
  38 #define ECX (env->regs[R_ECX])
  39 #define EDX (env->regs[R_EDX])
  40 #define EBX (env->regs[R_EBX])
  41 #define ESP (env->regs[R_ESP])
  42 #define EBP (env->regs[R_EBP])
  43 #define ESI (env->regs[R_ESI])
  44 #define EDI (env->regs[R_EDI])
  45 #define EIP (env->eip)
  46 #define DF  (env->df)
  47
  48 #define CC_SRC (env->cc_src)
  49 #define CC_DST (env->cc_dst)
  50 #define CC_OP  (env->cc_op)
  51
  52 /* float macros */
  53 #define FT0    (env->ft0)
  54 #define ST0    (env->fpregs[env->fpstt].d)
  55 #define ST(n)  (env->fpregs[(env->fpstt + (n)) & 7].d)
  56 #define ST1    ST(1)
  57
  58 #include "cpu.h"
  59 #include "exec-all.h"
  60
  61 /* op_helper.c */
  62 void do_interrupt(int intno, int is_int, int error_code,
  63                   target_ulong next_eip, int is_hw);
  64 void do_interrupt_user(int intno, int is_int, int error_code,
  65                        target_ulong next_eip);
  66 void QEMU_NORETURN raise_exception_err(int exception_index, int error_code);
  67 void QEMU_NORETURN raise_exception(int exception_index);
  68 void do_smm_enter(void);
  69
  70 /* n must be a constant to be efficient */
  71 static inline target_long lshift(target_long x, int n)
  72 {
  73     if (n >= 0)
  74         return x << n;
  75     else
  76         return x >> (-n);
  77 }
  78
  79 #include "helper.h"
  80
  81 static inline void svm_check_intercept(uint32_t type)
  82 {
  83     helper_svm_check_intercept_param(type, 0);
  84 }
  85
  86 #if !defined(CONFIG_USER_ONLY)
  87
  88 #include "softmmu_exec.h"
  89
  90 #endif /* !defined(CONFIG_USER_ONLY) */
  91
  92 #ifdef USE_X86LDOUBLE
  93 /* use long double functions */
  94 #define floatx_to_int32 floatx80_to_int32
  95 #define floatx_to_int64 floatx80_to_int64
  96 #define floatx_to_int32_round_to_zero floatx80_to_int32_round_to_zero
  97 #define floatx_to_int64_round_to_zero floatx80_to_int64_round_to_zero
  98 #define int32_to_floatx int32_to_floatx80
  99 #define int64_to_floatx int64_to_floatx80
 100 #define float32_to_floatx float32_to_floatx80
 101 #define float64_to_floatx float64_to_floatx80
 102 #define floatx_to_float32 floatx80_to_float32
 103 #define floatx_to_float64 floatx80_to_float64
 104 #define floatx_abs floatx80_abs
 105 #define floatx_chs floatx80_chs
 106 #define floatx_round_to_int floatx80_round_to_int
 107 #define floatx_compare floatx80_compare
 108 #define floatx_compare_quiet floatx80_compare_quiet
 109 #else
 110 #define floatx_to_int32 float64_to_int32
 111 #define floatx_to_int64 float64_to_int64
 112 #define floatx_to_int32_round_to_zero float64_to_int32_round_to_zero
 113 #define floatx_to_int64_round_to_zero float64_to_int64_round_to_zero
 114 #define int32_to_floatx int32_to_float64
 115 #define int64_to_floatx int64_to_float64
 116 #define float32_to_floatx float32_to_float64
 117 #define float64_to_floatx(x, e) (x)
 118 #define floatx_to_float32 float64_to_float32
 119 #define floatx_to_float64(x, e) (x)
 120 #define floatx_abs float64_abs
 121 #define floatx_chs float64_chs
 122 #define floatx_round_to_int float64_round_to_int
 123 #define floatx_compare float64_compare
 124 #define floatx_compare_quiet float64_compare_quiet
 125 #endif
 126
 127 #define RC_MASK         0xc00
 128 #define RC_NEAR         0x000
 129 #define RC_DOWN         0x400
 130 #define RC_UP           0x800
 131 #define RC_CHOP         0xc00
 132
 133 #define MAXTAN 9223372036854775808.0
 134
 135 #ifdef USE_X86LDOUBLE
 136
 137 /* only for x86 */
 138 typedef union {
 139     long double d;
 140     struct {
 141         unsigned long long lower;
 142         unsigned short upper;
 143     } l;
 144 } CPU86_LDoubleU;
 145
 146 /* the following deal with x86 long double-precision numbers */
 147 #define MAXEXPD 0x7fff
 148 #define EXPBIAS 16383
 149 #define EXPD(fp)        (fp.l.upper & 0x7fff)
 150 #define SIGND(fp)       ((fp.l.upper) & 0x8000)
 151 #define MANTD(fp)       (fp.l.lower)
 152 #define BIASEXPONENT(fp) fp.l.upper = (fp.l.upper & ~(0x7fff)) | EXPBIAS
 153
 154 #else
 155
 156 /* NOTE: arm is horrible as double 32 bit words are stored in big endian ! */
 157 typedef union {
 158     double d;
 159 #if !defined(WORDS_BIGENDIAN) && !defined(__arm__)
 160     struct {
 161         uint32_t lower;
 162         int32_t upper;
 163     } l;
 164 #else
 165     struct {
 166         int32_t upper;
 167         uint32_t lower;
 168     } l;
 169 #endif
 170 #ifndef __arm__
 171     int64_t ll;
 172 #endif
 173 } CPU86_LDoubleU;
 174
 175 /* the following deal with IEEE double-precision numbers */
 176 #define MAXEXPD 0x7ff
 177 #define EXPBIAS 1023
 178 #define EXPD(fp)        (((fp.l.upper) >> 20) & 0x7FF)
 179 #define SIGND(fp)       ((fp.l.upper) & 0x80000000)
 180 #ifdef __arm__
 181 #define MANTD(fp)       (fp.l.lower | ((uint64_t)(fp.l.upper & ((1 << 20) - 1)) << 32))
 182 #else
 183 #define MANTD(fp)       (fp.ll & ((1LL << 52) - 1))
 184 #endif
 185 #define BIASEXPONENT(fp) fp.l.upper = (fp.l.upper & ~(0x7ff << 20)) | (EXPBIAS << 20)
 186 #endif
 187
 188 static inline void fpush(void)
 189 {
 190     env->fpstt = (env->fpstt - 1) & 7;
 191     env->fptags[env->fpstt] = 0; /* validate stack entry */
 192 }
 193
 194 static inline void fpop(void)
 195 {
 196     env->fptags[env->fpstt] = 1; /* invvalidate stack entry */
 197     env->fpstt = (env->fpstt + 1) & 7;
 198 }
 199
 200 #ifndef USE_X86LDOUBLE
 201 static inline CPU86_LDouble helper_fldt(target_ulong ptr)
 202 {
 203     CPU86_LDoubleU temp;
 204     int upper, e;
 205     uint64_t ll;
 206
 207     /* mantissa */
 208     upper = lduw(ptr + 8);
 209     /* XXX: handle overflow ? */
 210     e = (upper & 0x7fff) - 16383 + EXPBIAS; /* exponent */
 211     e |= (upper >> 4) & 0x800; /* sign */
 212     ll = (ldq(ptr) >> 11) & ((1LL << 52) - 1);
 213 #ifdef __arm__
 214     temp.l.upper = (e << 20) | (ll >> 32);
 215     temp.l.lower = ll;
 216 #else
 217     temp.ll = ll | ((uint64_t)e << 52);
 218 #endif
 219     return temp.d;
 220 }
 221
 222 static inline void helper_fstt(CPU86_LDouble f, target_ulong ptr)
 223 {
 224     CPU86_LDoubleU temp;
 225     int e;
 226
 227     temp.d = f;
 228     /* mantissa */
 229     stq(ptr, (MANTD(temp) << 11) | (1LL << 63));
 230     /* exponent + sign */
 231     e = EXPD(temp) - EXPBIAS + 16383;
 232     e |= SIGND(temp) >> 16;
 233     stw(ptr + 8, e);
 234 }
 235 #else
 236
 237 /* we use memory access macros */
 238
 239 static inline CPU86_LDouble helper_fldt(target_ulong ptr)
 240 {
 241     CPU86_LDoubleU temp;
 242
 243     temp.l.lower = ldq(ptr);
 244     temp.l.upper = lduw(ptr + 8);
 245     return temp.d;
 246 }
 247
 248 static inline void helper_fstt(CPU86_LDouble f, target_ulong ptr)
 249 {
 250     CPU86_LDoubleU temp;
 251
 252     temp.d = f;
 253     stq(ptr, temp.l.lower);
 254     stw(ptr + 8, temp.l.upper);
 255 }
 256
 257 #endif /* USE_X86LDOUBLE */
 258
 259 #define FPUS_IE (1 << 0)
 260 #define FPUS_DE (1 << 1)
 261 #define FPUS_ZE (1 << 2)
 262 #define FPUS_OE (1 << 3)
 263 #define FPUS_UE (1 << 4)
 264 #define FPUS_PE (1 << 5)
 265 #define FPUS_SF (1 << 6)
 266 #define FPUS_SE (1 << 7)
 267 #define FPUS_B  (1 << 15)
 268
 269 #define FPUC_EM 0x3f
 270
 271 static inline uint32_t compute_eflags(void)
 272 {
 273     return env->eflags | helper_cc_compute_all(CC_OP) | (DF & DF_MASK);
 274 }
 275
 276 /* NOTE: CC_OP must be modified manually to CC_OP_EFLAGS */
 277 static inline void load_eflags(int eflags, int update_mask)
 278 {
 279     CC_SRC = eflags & (CC_O | CC_S | CC_Z | CC_A | CC_P | CC_C);
 280     DF = 1 - (2 * ((eflags >> 10) & 1));
 281     env->eflags = (env->eflags & ~update_mask) |
 282         (eflags & update_mask) | 0x2;
 283 }
 284
 285 static inline void env_to_regs(void)
 286 {
 287 #ifdef reg_EAX
 288     EAX = env->regs[R_EAX];
 289 #endif
 290 #ifdef reg_ECX
 291     ECX = env->regs[R_ECX];
 292 #endif
 293 #ifdef reg_EDX
 294     EDX = env->regs[R_EDX];
 295 #endif
 296 #ifdef reg_EBX
 297     EBX = env->regs[R_EBX];
 298 #endif
 299 #ifdef reg_ESP
 300     ESP = env->regs[R_ESP];
 301 #endif
 302 #ifdef reg_EBP
 303     EBP = env->regs[R_EBP];
 304 #endif
 305 #ifdef reg_ESI
 306     ESI = env->regs[R_ESI];
 307 #endif
 308 #ifdef reg_EDI
 309     EDI = env->regs[R_EDI];
 310 #endif
 311 }
 312
 313 static inline void regs_to_env(void)
 314 {
 315 #ifdef reg_EAX
 316     env->regs[R_EAX] = EAX;
 317 #endif
 318 #ifdef reg_ECX
 319     env->regs[R_ECX] = ECX;
 320 #endif
 321 #ifdef reg_EDX
 322     env->regs[R_EDX] = EDX;
 323 #endif
 324 #ifdef reg_EBX
 325     env->regs[R_EBX] = EBX;
 326 #endif
 327 #ifdef reg_ESP
 328     env->regs[R_ESP] = ESP;
 329 #endif
 330 #ifdef reg_EBP
 331     env->regs[R_EBP] = EBP;
 332 #endif
 333 #ifdef reg_ESI
 334     env->regs[R_ESI] = ESI;
 335 #endif
 336 #ifdef reg_EDI
 337     env->regs[R_EDI] = EDI;
 338 #endif
 339 }
 340
 341 static inline int cpu_has_work(CPUState *env)
 342 {
 343     int work;
 344
 345     work = (env->interrupt_request & CPU_INTERRUPT_HARD) &&
 346            (env->eflags & IF_MASK);
 347     work |= env->interrupt_request & CPU_INTERRUPT_NMI;
 348
 349     return work;
 350 }
 351
 352 static inline int cpu_halted(CPUState *env) {
 353     /* handle exit of HALTED state */
 354     if (!env->halted)
 355         return 0;
 356     /* disable halt condition */
 357     if (cpu_has_work(env)) {
 358         env->halted = 0;
 359         return 0;
 360     }
 361     return EXCP_HALTED;
 362 }
 363
 364 /* load efer and update the corresponding hflags. XXX: do consistency
 365    checks with cpuid bits ? */
 366 static inline void cpu_load_efer(CPUState *env, uint64_t val)
 367 {
 368     env->efer = val;
 369     env->hflags &= ~(HF_LMA_MASK | HF_SVME_MASK);
 370     if (env->efer & MSR_EFER_LMA)
 371         env->hflags |= HF_LMA_MASK;
 372     if (env->efer & MSR_EFER_SVME)
 373         env->hflags |= HF_SVME_MASK;
 374 }