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Commit bedf142b authored by Lennert Buytenhek's avatar Lennert Buytenhek Committed by Russell King
Browse files

[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: default avatarLennert Buytenhek <buytenh@wantstofly.org>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 06c03cac

arch/arm/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -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.

arch/arm/nwfpe/fpa11.h

+1 −1
Original line number Diff line number Diff line
@@ -60,7 +60,7 @@ typedef union tagFPREG { 
#ifdef CONFIG_FPE_NWFPE_XP

	floatx80 fExtended;

#else

	int padding[3];

	u32 padding[3];

#endif

} FPREG;

arch/arm/nwfpe/fpa11_cpdt.c

+10 −0
Original line number Diff line number Diff line
@@ -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

arch/arm/nwfpe/softfloat.h

+10 −5
Original line number Diff line number Diff line
@@ -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;



/*