exec-i386.h - third_party/qemu - Git at Google

 /*
  *  i386 execution defines
  *
  *  Copyright (c) 2003 Fabrice Bellard
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with this library; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
 #include "dyngen-exec.h"

 /* at least 4 register variables are defines */
 register struct CPUX86State *env asm(AREG0);
 register uint32_t T0 asm(AREG1);
 register uint32_t T1 asm(AREG2);
 register uint32_t T2 asm(AREG3);

 #define A0 T2

 /* if more registers are available, we define some registers too */
 #ifdef AREG4
 register uint32_t EAX asm(AREG4);
 #define reg_EAX
 #endif

 #ifdef AREG5
 register uint32_t ESP asm(AREG5);
 #define reg_ESP
 #endif

 #ifdef AREG6
 register uint32_t EBP asm(AREG6);
 #define reg_EBP
 #endif

 #ifdef AREG7
 register uint32_t ECX asm(AREG7);
 #define reg_ECX
 #endif

 #ifdef AREG8
 register uint32_t EDX asm(AREG8);
 #define reg_EDX
 #endif

 #ifdef AREG9
 register uint32_t EBX asm(AREG9);
 #define reg_EBX
 #endif

 #ifdef AREG10
 register uint32_t ESI asm(AREG10);
 #define reg_ESI
 #endif

 #ifdef AREG11
 register uint32_t EDI asm(AREG11);
 #define reg_EDI
 #endif

 extern FILE *logfile;
 extern int loglevel;

 #ifndef reg_EAX
 #define EAX (env->regs[R_EAX])
 #endif
 #ifndef reg_ECX
 #define ECX (env->regs[R_ECX])
 #endif
 #ifndef reg_EDX
 #define EDX (env->regs[R_EDX])
 #endif
 #ifndef reg_EBX
 #define EBX (env->regs[R_EBX])
 #endif
 #ifndef reg_ESP
 #define ESP (env->regs[R_ESP])
 #endif
 #ifndef reg_EBP
 #define EBP (env->regs[R_EBP])
 #endif
 #ifndef reg_ESI
 #define ESI (env->regs[R_ESI])
 #endif
 #ifndef reg_EDI
 #define EDI (env->regs[R_EDI])
 #endif
 #define EIP  (env->eip)
 #define DF  (env->df)

 #define CC_SRC (env->cc_src)
 #define CC_DST (env->cc_dst)
 #define CC_OP  (env->cc_op)

 /* float macros */
 #define FT0    (env->ft0)
 #define ST0    (env->fpregs[env->fpstt])
 #define ST(n)  (env->fpregs[(env->fpstt + (n)) & 7])
 #define ST1    ST(1)

 #ifdef USE_FP_CONVERT
 #define FP_CONVERT  (env->fp_convert)
 #endif

 #include "cpu-i386.h"
 #include "exec.h"

 typedef struct CCTable {
     int (*compute_all)(void); /* return all the flags */
     int (*compute_c)(void);  /* return the C flag */
 } CCTable;

 extern CCTable cc_table[];

 void load_seg(int seg_reg, int selector, unsigned cur_eip);
 void jmp_seg(int selector, unsigned int new_eip);
 void helper_iret_protected(int shift);
 void helper_lldt_T0(void);
 void helper_ltr_T0(void);
 void helper_movl_crN_T0(int reg);
 void helper_movl_drN_T0(int reg);
 void helper_invlpg(unsigned int addr);
 void cpu_x86_update_cr0(CPUX86State *env);
 void cpu_x86_update_cr3(CPUX86State *env);
 void cpu_x86_flush_tlb(CPUX86State *env, uint32_t addr);
 int cpu_x86_handle_mmu_fault(CPUX86State *env, uint32_t addr, int is_write);
 void __hidden cpu_lock(void);
 void __hidden cpu_unlock(void);
 void do_interrupt(int intno, int is_int, int error_code,
                   unsigned int next_eip);
 void do_interrupt_user(int intno, int is_int, int error_code,
                        unsigned int next_eip);
 void raise_interrupt(int intno, int is_int, int error_code,
                      unsigned int next_eip);
 void raise_exception_err(int exception_index, int error_code);
 void raise_exception(int exception_index);
 void __hidden cpu_loop_exit(void);
 void helper_fsave(uint8_t *ptr, int data32);
 void helper_frstor(uint8_t *ptr, int data32);

 void OPPROTO op_movl_eflags_T0(void);
 void OPPROTO op_movl_T0_eflags(void);
 void raise_interrupt(int intno, int is_int, int error_code,
                      unsigned int next_eip);
 void raise_exception_err(int exception_index, int error_code);
 void raise_exception(int exception_index);
 void helper_divl_EAX_T0(uint32_t eip);
 void helper_idivl_EAX_T0(uint32_t eip);
 void helper_cmpxchg8b(void);
 void helper_cpuid(void);
 void helper_rdtsc(void);
 void helper_rdmsr(void);
 void helper_wrmsr(void);
 void helper_lsl(void);
 void helper_lar(void);

 #ifdef USE_X86LDOUBLE
 /* use long double functions */
 #define lrint lrintl
 #define llrint llrintl
 #define fabs fabsl
 #define sin sinl
 #define cos cosl
 #define sqrt sqrtl
 #define pow powl
 #define log logl
 #define tan tanl
 #define atan2 atan2l
 #define floor floorl
 #define ceil ceill
 #define rint rintl
 #endif

 extern int lrint(CPU86_LDouble x);
 extern int64_t llrint(CPU86_LDouble x);
 extern CPU86_LDouble fabs(CPU86_LDouble x);
 extern CPU86_LDouble sin(CPU86_LDouble x);
 extern CPU86_LDouble cos(CPU86_LDouble x);
 extern CPU86_LDouble sqrt(CPU86_LDouble x);
 extern CPU86_LDouble pow(CPU86_LDouble, CPU86_LDouble);
 extern CPU86_LDouble log(CPU86_LDouble x);
 extern CPU86_LDouble tan(CPU86_LDouble x);
 extern CPU86_LDouble atan2(CPU86_LDouble, CPU86_LDouble);
 extern CPU86_LDouble floor(CPU86_LDouble x);
 extern CPU86_LDouble ceil(CPU86_LDouble x);
 extern CPU86_LDouble rint(CPU86_LDouble x);

 #define RC_MASK         0xc00
 #define RC_NEAR		0x000
 #define RC_DOWN		0x400
 #define RC_UP		0x800
 #define RC_CHOP		0xc00

 #define MAXTAN 9223372036854775808.0

 #ifdef __arm__
 /* we have no way to do correct rounding - a FPU emulator is needed */
 #define FE_DOWNWARD   FE_TONEAREST
 #define FE_UPWARD     FE_TONEAREST
 #define FE_TOWARDZERO FE_TONEAREST
 #endif

 #ifdef USE_X86LDOUBLE

 /* only for x86 */
 typedef union {
     long double d;
     struct {
         unsigned long long lower;
         unsigned short upper;
     } l;
 } CPU86_LDoubleU;

 /* the following deal with x86 long double-precision numbers */
 #define MAXEXPD 0x7fff
 #define EXPBIAS 16383
 #define EXPD(fp)	(fp.l.upper & 0x7fff)
 #define SIGND(fp)	((fp.l.upper) & 0x8000)
 #define MANTD(fp)       (fp.l.lower)
 #define BIASEXPONENT(fp) fp.l.upper = (fp.l.upper & ~(0x7fff)) | EXPBIAS

 #else

 /* NOTE: arm is horrible as double 32 bit words are stored in big endian ! */
 typedef union {
     double d;
 #if !defined(WORDS_BIGENDIAN) && !defined(__arm__)
     struct {
         uint32_t lower;
         int32_t upper;
     } l;
 #else
     struct {
         int32_t upper;
         uint32_t lower;
     } l;
 #endif
 #ifndef __arm__
     int64_t ll;
 #endif
 } CPU86_LDoubleU;

 /* the following deal with IEEE double-precision numbers */
 #define MAXEXPD 0x7ff
 #define EXPBIAS 1023
 #define EXPD(fp)	(((fp.l.upper) >> 20) & 0x7FF)
 #define SIGND(fp)	((fp.l.upper) & 0x80000000)
 #ifdef __arm__
 #define MANTD(fp)	(fp.l.lower | ((uint64_t)(fp.l.upper & ((1 << 20) - 1)) << 32))
 #else
 #define MANTD(fp)	(fp.ll & ((1LL << 52) - 1))
 #endif
 #define BIASEXPONENT(fp) fp.l.upper = (fp.l.upper & ~(0x7ff << 20)) | (EXPBIAS << 20)
 #endif

 static inline void fpush(void)
 {
     env->fpstt = (env->fpstt - 1) & 7;
     env->fptags[env->fpstt] = 0; /* validate stack entry */
 }

 static inline void fpop(void)
 {
     env->fptags[env->fpstt] = 1; /* invvalidate stack entry */
     env->fpstt = (env->fpstt + 1) & 7;
 }

 #ifndef USE_X86LDOUBLE
 static inline CPU86_LDouble helper_fldt(uint8_t *ptr)
 {
     CPU86_LDoubleU temp;
     int upper, e;
     uint64_t ll;

     /* mantissa */
     upper = lduw(ptr + 8);
     /* XXX: handle overflow ? */
     e = (upper & 0x7fff) - 16383 + EXPBIAS; /* exponent */
     e |= (upper >> 4) & 0x800; /* sign */
     ll = (ldq(ptr) >> 11) & ((1LL << 52) - 1);
 #ifdef __arm__
     temp.l.upper = (e << 20) | (ll >> 32);
     temp.l.lower = ll;
 #else
     temp.ll = ll | ((uint64_t)e << 52);
 #endif
     return temp.d;
 }

 static inline void helper_fstt(CPU86_LDouble f, uint8_t *ptr)
 {
     CPU86_LDoubleU temp;
     int e;

     temp.d = f;
     /* mantissa */
     stq(ptr, (MANTD(temp) << 11) | (1LL << 63));
     /* exponent + sign */
     e = EXPD(temp) - EXPBIAS + 16383;
     e |= SIGND(temp) >> 16;
     stw(ptr + 8, e);
 }
 #endif

 const CPU86_LDouble f15rk[7];

 void helper_fldt_ST0_A0(void);
 void helper_fstt_ST0_A0(void);
 void helper_fbld_ST0_A0(void);
 void helper_fbst_ST0_A0(void);
 void helper_f2xm1(void);
 void helper_fyl2x(void);
 void helper_fptan(void);
 void helper_fpatan(void);
 void helper_fxtract(void);
 void helper_fprem1(void);
 void helper_fprem(void);
 void helper_fyl2xp1(void);
 void helper_fsqrt(void);
 void helper_fsincos(void);
 void helper_frndint(void);
 void helper_fscale(void);
 void helper_fsin(void);
 void helper_fcos(void);
 void helper_fxam_ST0(void);
 void helper_fstenv(uint8_t *ptr, int data32);
 void helper_fldenv(uint8_t *ptr, int data32);
 void helper_fsave(uint8_t *ptr, int data32);
 void helper_frstor(uint8_t *ptr, int data32);

 const uint8_t parity_table[256];
 const uint8_t rclw_table[32];
 const uint8_t rclb_table[32];

 static inline uint32_t compute_eflags(void)
 {
     return env->eflags | cc_table[CC_OP].compute_all() | (DF & DF_MASK);
 }

 #define FL_UPDATE_MASK32 (TF_MASK | AC_MASK | ID_MASK)

 #define FL_UPDATE_CPL0_MASK (TF_MASK | IF_MASK | IOPL_MASK | NT_MASK | \
                              RF_MASK | AC_MASK | ID_MASK)

 /* NOTE: CC_OP must be modified manually to CC_OP_EFLAGS */
 static inline void load_eflags(int eflags, int update_mask)
 {
     CC_SRC = eflags & (CC_O | CC_S | CC_Z | CC_A | CC_P | CC_C);
     DF = 1 - (2 * ((eflags >> 10) & 1));
     env->eflags = (env->eflags & ~update_mask) |
         (eflags & update_mask);
 }
	/*
	* i386 execution defines
	*
	* Copyright (c) 2003 Fabrice Bellard
	*
	* This library is free software; you can redistribute it and/or
	* modify it under the terms of the GNU Lesser General Public
	* License as published by the Free Software Foundation; either
	* version 2 of the License, or (at your option) any later version.
	*
	* This library is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* Lesser General Public License for more details.
	*
	* You should have received a copy of the GNU Lesser General Public
	* License along with this library; if not, write to the Free Software
	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	*/
	#include "dyngen-exec.h"

	/* at least 4 register variables are defines */
	register struct CPUX86State *env asm(AREG0);
	register uint32_t T0 asm(AREG1);
	register uint32_t T1 asm(AREG2);
	register uint32_t T2 asm(AREG3);

	#define A0 T2

	/* if more registers are available, we define some registers too */
	#ifdef AREG4
	register uint32_t EAX asm(AREG4);
	#define reg_EAX
	#endif

	#ifdef AREG5
	register uint32_t ESP asm(AREG5);
	#define reg_ESP
	#endif

	#ifdef AREG6
	register uint32_t EBP asm(AREG6);
	#define reg_EBP
	#endif

	#ifdef AREG7
	register uint32_t ECX asm(AREG7);
	#define reg_ECX
	#endif

	#ifdef AREG8
	register uint32_t EDX asm(AREG8);
	#define reg_EDX
	#endif

	#ifdef AREG9
	register uint32_t EBX asm(AREG9);
	#define reg_EBX
	#endif

	#ifdef AREG10
	register uint32_t ESI asm(AREG10);
	#define reg_ESI
	#endif

	#ifdef AREG11
	register uint32_t EDI asm(AREG11);
	#define reg_EDI
	#endif

	extern FILE *logfile;
	extern int loglevel;

	#ifndef reg_EAX
	#define EAX (env->regs[R_EAX])
	#endif
	#ifndef reg_ECX
	#define ECX (env->regs[R_ECX])
	#endif
	#ifndef reg_EDX
	#define EDX (env->regs[R_EDX])
	#endif
	#ifndef reg_EBX
	#define EBX (env->regs[R_EBX])
	#endif
	#ifndef reg_ESP
	#define ESP (env->regs[R_ESP])
	#endif
	#ifndef reg_EBP
	#define EBP (env->regs[R_EBP])
	#endif
	#ifndef reg_ESI
	#define ESI (env->regs[R_ESI])
	#endif
	#ifndef reg_EDI
	#define EDI (env->regs[R_EDI])
	#endif
	#define EIP (env->eip)
	#define DF (env->df)

	#define CC_SRC (env->cc_src)
	#define CC_DST (env->cc_dst)
	#define CC_OP (env->cc_op)

	/* float macros */
	#define FT0 (env->ft0)
	#define ST0 (env->fpregs[env->fpstt])
	#define ST(n) (env->fpregs[(env->fpstt + (n)) & 7])
	#define ST1 ST(1)

	#ifdef USE_FP_CONVERT
	#define FP_CONVERT (env->fp_convert)
	#endif

	#include "cpu-i386.h"
	#include "exec.h"

	typedef struct CCTable {
	int (compute_all)(void); / return all the flags */
	int (compute_c)(void); / return the C flag */
	} CCTable;

	extern CCTable cc_table[];

	void load_seg(int seg_reg, int selector, unsigned cur_eip);
	void jmp_seg(int selector, unsigned int new_eip);
	void helper_iret_protected(int shift);
	void helper_lldt_T0(void);
	void helper_ltr_T0(void);
	void helper_movl_crN_T0(int reg);
	void helper_movl_drN_T0(int reg);
	void helper_invlpg(unsigned int addr);
	void cpu_x86_update_cr0(CPUX86State *env);
	void cpu_x86_update_cr3(CPUX86State *env);
	void cpu_x86_flush_tlb(CPUX86State *env, uint32_t addr);
	int cpu_x86_handle_mmu_fault(CPUX86State *env, uint32_t addr, int is_write);
	void __hidden cpu_lock(void);
	void __hidden cpu_unlock(void);
	void do_interrupt(int intno, int is_int, int error_code,
	unsigned int next_eip);
	void do_interrupt_user(int intno, int is_int, int error_code,
	unsigned int next_eip);
	void raise_interrupt(int intno, int is_int, int error_code,
	unsigned int next_eip);
	void raise_exception_err(int exception_index, int error_code);
	void raise_exception(int exception_index);
	void __hidden cpu_loop_exit(void);
	void helper_fsave(uint8_t *ptr, int data32);
	void helper_frstor(uint8_t *ptr, int data32);

	void OPPROTO op_movl_eflags_T0(void);
	void OPPROTO op_movl_T0_eflags(void);
	void raise_interrupt(int intno, int is_int, int error_code,
	unsigned int next_eip);
	void raise_exception_err(int exception_index, int error_code);
	void raise_exception(int exception_index);
	void helper_divl_EAX_T0(uint32_t eip);
	void helper_idivl_EAX_T0(uint32_t eip);
	void helper_cmpxchg8b(void);
	void helper_cpuid(void);
	void helper_rdtsc(void);
	void helper_rdmsr(void);
	void helper_wrmsr(void);
	void helper_lsl(void);
	void helper_lar(void);

	#ifdef USE_X86LDOUBLE
	/* use long double functions */
	#define lrint lrintl
	#define llrint llrintl
	#define fabs fabsl
	#define sin sinl
	#define cos cosl
	#define sqrt sqrtl
	#define pow powl
	#define log logl
	#define tan tanl
	#define atan2 atan2l
	#define floor floorl
	#define ceil ceill
	#define rint rintl
	#endif

	extern int lrint(CPU86_LDouble x);
	extern int64_t llrint(CPU86_LDouble x);
	extern CPU86_LDouble fabs(CPU86_LDouble x);
	extern CPU86_LDouble sin(CPU86_LDouble x);
	extern CPU86_LDouble cos(CPU86_LDouble x);
	extern CPU86_LDouble sqrt(CPU86_LDouble x);
	extern CPU86_LDouble pow(CPU86_LDouble, CPU86_LDouble);
	extern CPU86_LDouble log(CPU86_LDouble x);
	extern CPU86_LDouble tan(CPU86_LDouble x);
	extern CPU86_LDouble atan2(CPU86_LDouble, CPU86_LDouble);
	extern CPU86_LDouble floor(CPU86_LDouble x);
	extern CPU86_LDouble ceil(CPU86_LDouble x);
	extern CPU86_LDouble rint(CPU86_LDouble x);

	#define RC_MASK 0xc00
	#define RC_NEAR 0x000
	#define RC_DOWN 0x400
	#define RC_UP 0x800
	#define RC_CHOP 0xc00

	#define MAXTAN 9223372036854775808.0

	#ifdef __arm__
	/* we have no way to do correct rounding - a FPU emulator is needed */
	#define FE_DOWNWARD FE_TONEAREST
	#define FE_UPWARD FE_TONEAREST
	#define FE_TOWARDZERO FE_TONEAREST
	#endif

	#ifdef USE_X86LDOUBLE

	/* only for x86 */
	typedef union {
	long double d;
	struct {
	unsigned long long lower;
	unsigned short upper;
	} l;
	} CPU86_LDoubleU;

	/* the following deal with x86 long double-precision numbers */
	#define MAXEXPD 0x7fff
	#define EXPBIAS 16383
	#define EXPD(fp) (fp.l.upper & 0x7fff)
	#define SIGND(fp) ((fp.l.upper) & 0x8000)
	#define MANTD(fp) (fp.l.lower)
	#define BIASEXPONENT(fp) fp.l.upper = (fp.l.upper & ~(0x7fff)) \| EXPBIAS

	#else

	/* NOTE: arm is horrible as double 32 bit words are stored in big endian ! */
	typedef union {
	double d;
	#if !defined(WORDS_BIGENDIAN) && !defined(__arm__)
	struct {
	uint32_t lower;
	int32_t upper;
	} l;
	#else
	struct {
	int32_t upper;
	uint32_t lower;
	} l;
	#endif
	#ifndef __arm__
	int64_t ll;
	#endif
	} CPU86_LDoubleU;

	/* the following deal with IEEE double-precision numbers */
	#define MAXEXPD 0x7ff
	#define EXPBIAS 1023
	#define EXPD(fp) (((fp.l.upper) >> 20) & 0x7FF)
	#define SIGND(fp) ((fp.l.upper) & 0x80000000)
	#ifdef __arm__
	#define MANTD(fp) (fp.l.lower \| ((uint64_t)(fp.l.upper & ((1 << 20) - 1)) << 32))
	#else
	#define MANTD(fp) (fp.ll & ((1LL << 52) - 1))
	#endif
	#define BIASEXPONENT(fp) fp.l.upper = (fp.l.upper & ~(0x7ff << 20)) \| (EXPBIAS << 20)
	#endif

	static inline void fpush(void)
	{
	env->fpstt = (env->fpstt - 1) & 7;
	env->fptags[env->fpstt] = 0; /* validate stack entry */
	}

	static inline void fpop(void)
	{
	env->fptags[env->fpstt] = 1; /* invvalidate stack entry */
	env->fpstt = (env->fpstt + 1) & 7;
	}

	#ifndef USE_X86LDOUBLE
	static inline CPU86_LDouble helper_fldt(uint8_t *ptr)
	{
	CPU86_LDoubleU temp;
	int upper, e;
	uint64_t ll;

	/* mantissa */
	upper = lduw(ptr + 8);
	/* XXX: handle overflow ? */
	e = (upper & 0x7fff) - 16383 + EXPBIAS; /* exponent */
	e \|= (upper >> 4) & 0x800; /* sign */
	ll = (ldq(ptr) >> 11) & ((1LL << 52) - 1);
	#ifdef __arm__
	temp.l.upper = (e << 20) \| (ll >> 32);
	temp.l.lower = ll;
	#else
	temp.ll = ll \| ((uint64_t)e << 52);
	#endif
	return temp.d;
	}

	static inline void helper_fstt(CPU86_LDouble f, uint8_t *ptr)
	{
	CPU86_LDoubleU temp;
	int e;

	temp.d = f;
	/* mantissa */
	stq(ptr, (MANTD(temp) << 11) \| (1LL << 63));
	/* exponent + sign */
	e = EXPD(temp) - EXPBIAS + 16383;
	e \|= SIGND(temp) >> 16;
	stw(ptr + 8, e);
	}
	#endif

	const CPU86_LDouble f15rk[7];

	void helper_fldt_ST0_A0(void);
	void helper_fstt_ST0_A0(void);
	void helper_fbld_ST0_A0(void);
	void helper_fbst_ST0_A0(void);
	void helper_f2xm1(void);
	void helper_fyl2x(void);
	void helper_fptan(void);
	void helper_fpatan(void);
	void helper_fxtract(void);
	void helper_fprem1(void);
	void helper_fprem(void);
	void helper_fyl2xp1(void);
	void helper_fsqrt(void);
	void helper_fsincos(void);
	void helper_frndint(void);
	void helper_fscale(void);
	void helper_fsin(void);
	void helper_fcos(void);
	void helper_fxam_ST0(void);
	void helper_fstenv(uint8_t *ptr, int data32);
	void helper_fldenv(uint8_t *ptr, int data32);
	void helper_fsave(uint8_t *ptr, int data32);
	void helper_frstor(uint8_t *ptr, int data32);

	const uint8_t parity_table[256];
	const uint8_t rclw_table[32];
	const uint8_t rclb_table[32];

	static inline uint32_t compute_eflags(void)
	{
	return env->eflags \| cc_table[CC_OP].compute_all() \| (DF & DF_MASK);
	}

	#define FL_UPDATE_MASK32 (TF_MASK \| AC_MASK \| ID_MASK)

	#define FL_UPDATE_CPL0_MASK (TF_MASK \| IF_MASK \| IOPL_MASK \| NT_MASK \| \
	RF_MASK \| AC_MASK \| ID_MASK)

	/* NOTE: CC_OP must be modified manually to CC_OP_EFLAGS */
	static inline void load_eflags(int eflags, int update_mask)
	{
	CC_SRC = eflags & (CC_O \| CC_S \| CC_Z \| CC_A \| CC_P \| CC_C);
	DF = 1 - (2 * ((eflags >> 10) & 1));
	env->eflags = (env->eflags & ~update_mask) \|
	(eflags & update_mask);
	}