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[ARM] 3118/1: fix and reenable nwfpe extended precision emulation for big-endian 

Patch from Lennert Buytenhek

nwfpe extended precision emulation used to be broken on big-endian
and was therefore disabled.  This patch fixes nwfpe so that it copies
extended precision floats to/from userspace in the proper word order
(similar to patch #2046, see the description of that patch for an
explanation) and reenables the Kconfig option.

Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Lennert Buytenhek 2005-11-07 21:12:08 +00:00 committed by Russell King
parent 06c03cac94
commit bedf142b8b
4 changed files with 22 additions and 7 deletions
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2
arch/arm/Kconfig
View File

@ -585,7 +585,7 @@ config FPE_NWFPE
config FPE_NWFPE_XP
bool "Support extended precision"
depends on FPE_NWFPE && !CPU_BIG_ENDIAN
depends on FPE_NWFPE
help
Say Y to include 80-bit support in the kernel floating-point
emulator. Otherwise, only 32 and 64-bit support is compiled in.

2
arch/arm/nwfpe/fpa11.h
View File

@ -60,7 +60,7 @@ typedef union tagFPREG {
#ifdef CONFIG_FPE_NWFPE_XP
floatx80 fExtended;
#else
int padding[3];
u32 padding[3];
#endif
} FPREG;

10
arch/arm/nwfpe/fpa11_cpdt.c
View File

@ -59,8 +59,13 @@ static inline void loadExtended(const unsigned int Fn, const unsigned int __user
p = (unsigned int *) &fpa11->fpreg[Fn].fExtended;
fpa11->fType[Fn] = typeExtended;
get_user(p[0], &pMem[0]); /* sign & exponent */
#ifdef __ARMEB__
get_user(p[1], &pMem[1]); /* ms bits */
get_user(p[2], &pMem[2]); /* ls bits */
#else
get_user(p[1], &pMem[2]); /* ls bits */
get_user(p[2], &pMem[1]); /* ms bits */
#endif
}
#endif
@ -177,8 +182,13 @@ static inline void storeExtended(const unsigned int Fn, unsigned int __user *pMe
}
put_user(val.i[0], &pMem[0]); /* sign & exp */
#ifdef __ARMEB__
put_user(val.i[1], &pMem[1]); /* msw */
put_user(val.i[2], &pMem[2]);
#else
put_user(val.i[1], &pMem[2]);
put_user(val.i[2], &pMem[1]); /* msw */
#endif
}
#endif

15
arch/arm/nwfpe/softfloat.h
View File

@ -51,12 +51,17 @@ input or output the `floatx80' type will be defined.
Software IEC/IEEE floating-point types.
-------------------------------------------------------------------------------
*/
typedef unsigned long int float32;
typedef unsigned long long float64;
typedef u32 float32;
typedef u64 float64;
typedef struct {
unsigned short high;
unsigned short __padding;
unsigned long long low;
#ifdef __ARMEB__
u16 __padding;
u16 high;
#else
u16 high;
u16 __padding;
#endif
u64 low;
} floatx80;
/*