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Commit d8ce7263 authored by Geert Uytterhoeven's avatar Geert Uytterhoeven
Browse files

m68k: Use generic strncpy_from_user(), strlen_user(), and strnlen_user() 



Signed-off-by: default avatarGeert Uytterhoeven <geert@linux-m68k.org>
Acked-by: default avatarGreg Ungerer <gerg@uclinux.org>
parent f8f5701b

arch/m68k/Kconfig

+2 −0
Original line number Diff line number Diff line
@@ -7,6 +7,8 @@ config M68K 
	select GENERIC_IRQ_SHOW

	select ARCH_HAVE_NMI_SAFE_CMPXCHG if RMW_INSNS

	select GENERIC_CPU_DEVICES

	select GENERIC_STRNCPY_FROM_USER if MMU

	select GENERIC_STRNLEN_USER if MMU

	select FPU if MMU

	select ARCH_USES_GETTIMEOFFSET if MMU && !COLDFIRE

arch/m68k/include/asm/Kbuild

+2 −0
Original line number Diff line number Diff line 
include include/asm-generic/Kbuild.asm

header-y += cachectl.h



generic-y += word-at-a-time.h

arch/m68k/include/asm/uaccess_mm.h

+7 −4
Original line number Diff line number Diff line
@@ -379,12 +379,15 @@ __constant_copy_to_user(void __user *to, const void *from, unsigned long n) 
#define copy_from_user(to, from, n)	__copy_from_user(to, from, n)

#define copy_to_user(to, from, n)	__copy_to_user(to, from, n)



long strncpy_from_user(char *dst, const char __user *src, long count);

long strnlen_user(const char __user *src, long n);

#define user_addr_max() \

	(segment_eq(get_fs(), USER_DS) ? TASK_SIZE : ~0UL)



extern long strncpy_from_user(char *dst, const char __user *src, long count);

extern __must_check long strlen_user(const char __user *str);

extern __must_check long strnlen_user(const char __user *str, long n);



unsigned long __clear_user(void __user *to, unsigned long n);



#define clear_user	__clear_user



#define strlen_user(str) strnlen_user(str, 32767)



#endif /* _M68K_UACCESS_H */

arch/m68k/lib/uaccess.c

+0 −74
Original line number Diff line number Diff line
@@ -103,80 +103,6 @@ unsigned long __generic_copy_to_user(void __user *to, const void *from, 
}

EXPORT_SYMBOL(__generic_copy_to_user);



/*

 * Copy a null terminated string from userspace.

 */

long strncpy_from_user(char *dst, const char __user *src, long count)

{

	long res;

	char c;



	if (count <= 0)

		return count;



	asm volatile ("\n"

		"1:	"MOVES".b	(%2)+,%4\n"

		"	move.b	%4,(%1)+\n"

		"	jeq	2f\n"

		"	subq.l	#1,%3\n"

		"	jne	1b\n"

		"2:	sub.l	%3,%0\n"

		"3:\n"

		"	.section .fixup,\"ax\"\n"

		"	.even\n"

		"10:	move.l	%5,%0\n"

		"	jra	3b\n"

		"	.previous\n"

		"\n"

		"	.section __ex_table,\"a\"\n"

		"	.align	4\n"

		"	.long	1b,10b\n"

		"	.previous"

		: "=d" (res), "+a" (dst), "+a" (src), "+r" (count), "=&d" (c)

		: "i" (-EFAULT), "0" (count));



	return res;

}

EXPORT_SYMBOL(strncpy_from_user);



/*

 * Return the size of a string (including the ending 0)

 *

 * Return 0 on exception, a value greater than N if too long

 */

long strnlen_user(const char __user *src, long n)

{

	char c;

	long res;



	asm volatile ("\n"

		"1:	subq.l	#1,%1\n"

		"	jmi	3f\n"

		"2:	"MOVES".b	(%0)+,%2\n"

		"	tst.b	%2\n"

		"	jne	1b\n"

		"	jra	4f\n"

		"\n"

		"3:	addq.l	#1,%0\n"

		"4:	sub.l	%4,%0\n"

		"5:\n"

		"	.section .fixup,\"ax\"\n"

		"	.even\n"

		"20:	sub.l	%0,%0\n"

		"	jra	5b\n"

		"	.previous\n"

		"\n"

		"	.section __ex_table,\"a\"\n"

		"	.align	4\n"

		"	.long	2b,20b\n"

		"	.previous\n"

		: "=&a" (res), "+d" (n), "=&d" (c)

		: "0" (src), "r" (src));



	return res;

}

EXPORT_SYMBOL(strnlen_user);



/*

 * Zero Userspace

 */