Commit 1f1af9fd authored by Fabrice Bellard's avatar Fabrice Bellard
Browse files

added cpu_get_fp80() and cpu_set_fp80() 


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@687 c046a42c-6fe2-441c-8c8c-71466251a162
parent 858693c6

target-i386/cpu.h

+4 −0
Original line number Diff line number Diff line
@@ -408,6 +408,10 @@ static inline void cpu_x86_set_cpl(CPUX86State *s, int cpl) 
#endif

}



/* used for debug or cpu save/restore */

void cpu_get_fp80(uint64_t *pmant, uint16_t *pexp, CPU86_LDouble f);

CPU86_LDouble cpu_set_fp80(uint64_t mant, uint16_t upper);



/* the following helpers are only usable in user mode simulation as

   they can trigger unexpected exceptions */

void cpu_x86_load_seg(CPUX86State *s, int seg_reg, int selector);

target-i386/helper.c

+58 −2
Original line number Diff line number Diff line
@@ -2005,8 +2005,6 @@ void helper_fstt_ST0_A0(void) 


/* BCD ops */



#define MUL10(iv) ( iv + iv + (iv << 3) )



void helper_fbld_ST0_A0(void)

{

    CPU86_LDouble tmp;
@@ -2431,6 +2429,64 @@ void helper_frstor(uint8_t *ptr, int data32) 
    }

}



/* XXX: merge with helper_fstt ? */



#ifndef USE_X86LDOUBLE



void cpu_get_fp80(uint64_t *pmant, uint16_t *pexp, CPU86_LDouble f)

{

    CPU86_LDoubleU temp;

    int e;



    temp.d = f;

    /* mantissa */

    *pmant = (MANTD(temp) << 11) | (1LL << 63);

    /* exponent + sign */

    e = EXPD(temp) - EXPBIAS + 16383;

    e |= SIGND(temp) >> 16;

    *pexp = e;

}



CPU86_LDouble cpu_set_fp80(uint64_t mant, uint16_t upper)

{

    CPU86_LDoubleU temp;

    int e;

    uint64_t ll;



    /* XXX: handle overflow ? */

    e = (upper & 0x7fff) - 16383 + EXPBIAS; /* exponent */

    e |= (upper >> 4) & 0x800; /* sign */

    ll = (mant >> 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;

}



#else



void cpu_get_fp80(uint64_t *pmant, uint16_t *pexp, CPU86_LDouble f)

{

    CPU86_LDoubleU temp;



    temp.d = f;

    *pmant = temp.l.lower;

    *pexp = temp.l.upper;

}



CPU86_LDouble cpu_set_fp80(uint64_t mant, uint16_t upper)

{

    CPU86_LDoubleU temp;



    temp.l.upper = upper;

    temp.l.lower = mant;

    return temp.d;

}

#endif



#if !defined(CONFIG_USER_ONLY) 



#define MMUSUFFIX _mmu