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float access fixes 

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@489 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
bellard 2004-01-04 15:44:17 +00:00
parent 3811a291e2
commit 0ac4bd56a8
1 changed files with 86 additions and 42 deletions
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128
cpu-all.h
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@ -20,6 +20,40 @@
#ifndef CPU_ALL_H
#define CPU_ALL_H
#if defined(__arm__) || defined(__sparc__)
#define WORDS_ALIGNED
#endif
/* some important defines:
*
* WORDS_ALIGNED : if defined, the host cpu can only make word aligned
* memory accesses.
*
* WORDS_BIGENDIAN : if defined, the host cpu is big endian and
* otherwise little endian.
*
* (TARGET_WORDS_ALIGNED : same for target cpu (not supported yet))
*
* TARGET_WORDS_BIGENDIAN : same for target cpu
*/
/* 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;
uint32_t upper;
} l;
#else
struct {
uint32_t upper;
uint32_t lower;
} l;
#endif
uint64_t ll;
} CPU_DoubleU;
/* CPU memory access without any memory or io remapping */
static inline int ldub_raw(void *ptr)
@ -40,7 +74,7 @@ static inline void stb_raw(void *ptr, int v)
/* NOTE: on arm, putting 2 in /proc/sys/debug/alignment so that the
kernel handles unaligned load/stores may give better results, but
it is a system wide setting : bad */
#if defined(WORDS_BIGENDIAN) || defined(__arm__)
#if !defined(TARGET_WORDS_BIGENDIAN) && (defined(WORDS_BIGENDIAN) || defined(WORDS_ALIGNED))
/* conservative code for little endian unaligned accesses */
static inline int lduw_raw(void *ptr)
@ -141,55 +175,23 @@ static inline void stfl_raw(void *ptr, float v)
stl_raw(ptr, u.i);
}
#if defined(__arm__) && !defined(WORDS_BIGENDIAN)
/* NOTE: arm is horrible as double 32 bit words are stored in big endian ! */
static inline double ldfq_raw(void *ptr)
{
union {
double d;
uint32_t tab[2];
} u;
u.tab[1] = ldl_raw(ptr);
u.tab[0] = ldl_raw(ptr + 4);
CPU_DoubleU u;
u.l.lower = ldl_raw(ptr);
u.l.upper = ldl_raw(ptr + 4);
return u.d;
}
static inline void stfq_raw(void *ptr, double v)
{
union {
double d;
uint32_t tab[2];
} u;
CPU_DoubleU u;
u.d = v;
stl_raw(ptr, u.tab[1]);
stl_raw(ptr + 4, u.tab[0]);
stl_raw(ptr, u.l.lower);
stl_raw(ptr + 4, u.l.upper);
}
#else
static inline double ldfq_raw(void *ptr)
{
union {
double d;
uint64_t i;
} u;
u.i = ldq_raw(ptr);
return u.d;
}
static inline void stfq_raw(void *ptr, double v)
{
union {
double d;
uint64_t i;
} u;
u.d = v;
stq_raw(ptr, u.i);
}
#endif
#elif defined(TARGET_WORDS_BIGENDIAN) && !defined(WORDS_BIGENDIAN)
#elif defined(TARGET_WORDS_BIGENDIAN) && (!defined(WORDS_BIGENDIAN) || defined(WORDS_ALIGNED))
static inline int lduw_raw(void *ptr)
{
@ -235,8 +237,46 @@ static inline void stl_raw(void *ptr, int v)
static inline void stq_raw(void *ptr, uint64_t v)
{
stl_raw(ptr, v);
stl_raw(ptr+4, v >> 32);
stl_raw(ptr, v >> 32);
stl_raw(ptr + 4, v);
}
/* float access */
static inline float ldfl_raw(void *ptr)
{
union {
float f;
uint32_t i;
} u;
u.i = ldl_raw(ptr);
return u.f;
}
static inline void stfl_raw(void *ptr, float v)
{
union {
float f;
uint32_t i;
} u;
u.f = v;
stl_raw(ptr, u.i);
}
static inline double ldfq_raw(void *ptr)
{
CPU_DoubleU u;
u.l.upper = ldl_raw(ptr);
u.l.lower = ldl_raw(ptr + 4);
return u.d;
}
static inline void stfq_raw(void *ptr, double v)
{
CPU_DoubleU u;
u.d = v;
stl_raw(ptr, u.l.upper);
stl_raw(ptr + 4, u.l.lower);
}
#else
@ -330,10 +370,14 @@ static inline void stfq_raw(void *ptr, double v)
#define lduw_kernel(p) lduw_raw(p)
#define ldsw_kernel(p) ldsw_raw(p)
#define ldl_kernel(p) ldl_raw(p)
#define ldfl_kernel(p) ldfl_raw(p)
#define ldfq_kernel(p) ldfq_raw(p)
#define stb_kernel(p, v) stb_raw(p, v)
#define stw_kernel(p, v) stw_raw(p, v)
#define stl_kernel(p, v) stl_raw(p, v)
#define stq_kernel(p, v) stq_raw(p, v)
#define stfl_kernel(p, v) stfl_raw(p, v)
#define stfq_kernel(p, vt) stfq_raw(p, v)
#endif /* defined(CONFIG_USER_ONLY) */