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added cpu_get_fp80() and cpu_set_fp80()

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git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@687 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
bellard 2004-03-31 18:56:43 +00:00
parent 858693c638
commit 1f1af9fd7f
2 changed files with 62 additions and 2 deletions
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4
target-i386/cpu.h
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@ -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);

60
target-i386/helper.c
View File

@ -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