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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/m68k/lib/uaccess.c
26439 views
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/*

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 * This file is subject to the terms and conditions of the GNU General Public

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 * License.  See the file COPYING in the main directory of this archive

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 * for more details.

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 */

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#include <linux/module.h>

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#include <linux/uaccess.h>

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unsigned long __generic_copy_from_user(void *to, const void __user *from,

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				       unsigned long n)

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{

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	unsigned long tmp, res;

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	asm volatile ("\n"

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		"	tst.l	%0\n"

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		"	jeq	2f\n"

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		"1:	"MOVES".l	(%1)+,%3\n"

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		"	move.l	%3,(%2)+\n"

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		"	subq.l	#1,%0\n"

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		"	jne	1b\n"

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		"2:	btst	#1,%5\n"

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		"	jeq	4f\n"

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		"3:	"MOVES".w	(%1)+,%3\n"

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		"	move.w	%3,(%2)+\n"

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		"4:	btst	#0,%5\n"

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		"	jeq	6f\n"

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		"5:	"MOVES".b	(%1)+,%3\n"

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		"	move.b  %3,(%2)+\n"

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		"6:\n"

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

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		"	.even\n"

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		"10:	lsl.l	#2,%0\n"

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		"	btst	#1,%5\n"

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		"	jeq	8f\n"

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		"30:	addq.l	#2,%0\n"

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		"8:	btst	#0,%5\n"

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		"	jeq	6b\n"

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

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		"	jra	6b\n"

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		"	.previous\n"

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		"\n"

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

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		"	.align	4\n"

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		"	.long	1b,10b\n"

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		"	.long	3b,30b\n"

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		"	.long	5b,50b\n"

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		"	.previous"

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		: "=d" (res), "+a" (from), "+a" (to), "=&d" (tmp)

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		: "0" (n / 4), "d" (n & 3));

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	return res;

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}

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EXPORT_SYMBOL(__generic_copy_from_user);

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unsigned long __generic_copy_to_user(void __user *to, const void *from,

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				     unsigned long n)

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{

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	unsigned long tmp, res;

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	asm volatile ("\n"

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		"	tst.l	%0\n"

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		"	jeq	4f\n"

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		"1:	move.l	(%1)+,%3\n"

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		"2:	"MOVES".l	%3,(%2)+\n"

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

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		"	jne	1b\n"

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		"4:	btst	#1,%5\n"

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		"	jeq	6f\n"

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		"	move.w	(%1)+,%3\n"

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		"5:	"MOVES".w	%3,(%2)+\n"

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		"6:	btst	#0,%5\n"

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		"	jeq	8f\n"

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		"	move.b	(%1)+,%3\n"

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		"7:	"MOVES".b  %3,(%2)+\n"

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		"8:\n"

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

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		"	.even\n"

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		"20:	lsl.l	#2,%0\n"

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		"50:	add.l	%5,%0\n"

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		"	jra	8b\n"

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		"	.previous\n"

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		"\n"

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

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		"	.align	4\n"

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		"	.long	2b,20b\n"

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		"	.long	3b,20b\n"

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		"	.long	5b,50b\n"

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		"	.long	6b,50b\n"

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		"	.long	7b,50b\n"

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		"	.long	8b,50b\n"

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		"	.previous"

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		: "=d" (res), "+a" (from), "+a" (to), "=&d" (tmp)

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		: "0" (n / 4), "d" (n & 3));

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	return res;

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}

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EXPORT_SYMBOL(__generic_copy_to_user);

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/*

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 * Zero Userspace

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 */

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

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{

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	unsigned long res;

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	asm volatile ("\n"

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		"	tst.l	%0\n"

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		"	jeq	3f\n"

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

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		"2:	subq.l	#1,%0\n"

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		"	jne	1b\n"

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		"3:	btst	#1,%4\n"

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		"	jeq	5f\n"

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

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		"5:	btst	#0,%4\n"

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		"	jeq	7f\n"

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

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		"7:\n"

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

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		"	.even\n"

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		"10:	lsl.l	#2,%0\n"

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		"40:	add.l	%4,%0\n"

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		"	jra	7b\n"

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		"	.previous\n"

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		"\n"

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

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		"	.align	4\n"

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		"	.long	1b,10b\n"

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		"	.long	2b,10b\n"

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		"	.long	4b,40b\n"

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		"	.long	5b,40b\n"

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		"	.long	6b,40b\n"

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		"	.long	7b,40b\n"

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		"	.previous"

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		: "=d" (res), "+a" (to)

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		: "d" (0), "0" (n / 4), "d" (n & 3));

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    return res;

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}

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EXPORT_SYMBOL(__clear_user);

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