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weird arm double format support 

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@219 c046a42c-6fe2-441c-8c8c-71466251a162
master
bellard 2003-06-09 15:28:45 +00:00
parent 8c6939c0b0
commit e163bca720
1 changed files with 31 additions and 3 deletions
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34
exec-i386.h
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@ -243,11 +243,14 @@ 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_lsl(void);
void helper_lar(void);
#ifdef USE_X86LDOUBLE
/* use long double functions */
#define lrint lrintl
@ -287,6 +290,13 @@ extern CPU86_LDouble rint(CPU86_LDouble x);
#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 */
@ -308,9 +318,10 @@ typedef union {
#else
/* NOTE: arm is horrible as double 32 bit words are stored in big endian ! */
typedef union {
double d;
#ifndef WORDS_BIGENDIAN
#if !defined(WORDS_BIGENDIAN) && !defined(__arm__)
struct {
uint32_t lower;
int32_t upper;
@ -321,7 +332,9 @@ typedef union {
uint32_t lower;
} l;
#endif
#ifndef __arm__
int64_t ll;
#endif
} CPU86_LDoubleU;
/* the following deal with IEEE double-precision numbers */
@ -329,7 +342,11 @@ typedef union {
#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
@ -350,12 +367,20 @@ 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 */
temp.ll = ((ldq(ptr) >> 11) & ((1LL << 52) - 1)) | ((uint64_t)e << 52);
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;
}
@ -363,6 +388,7 @@ 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));
@ -373,6 +399,8 @@ static inline void helper_fstt(CPU86_LDouble f, uint8_t *ptr)
}
#endif
const CPU86_LDouble f15rk[7];
void helper_fldt_ST0_A0(void);
void helper_fstt_ST0_A0(void);
void helper_fbld_ST0_A0(void);