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