[deliverable/linux.git] / arch / sparc / lib / strncpy_from_user_32.S

/* strncpy_from_user.S: Sparc strncpy from userspace.
 *
 *  Copyright(C) 1996 David S. Miller
 */

#include <asm/ptrace.h>
#include <asm/errno.h>

	.text
	.align	4

	/* Must return:
	 *
	 * -EFAULT		for an exception
	 * count		if we hit the buffer limit
	 * bytes copied		if we hit a null byte
	 */

	.globl	__strncpy_from_user
__strncpy_from_user:
	/* %o0=dest, %o1=src, %o2=count */
	mov	%o2, %o3
1:
	subcc	%o2, 1, %o2
	bneg	2f
	 nop
10:
	ldub	[%o1], %o4
	add	%o0, 1, %o0
	cmp	%o4, 0
	add	%o1, 1, %o1
	bne	1b
	 stb	%o4, [%o0 - 1]
2:
	add	%o2, 1, %o0
	retl
	 sub	%o3, %o0, %o0

	.section .fixup,#alloc,#execinstr
	.align	4
4:
	retl
	 mov	-EFAULT, %o0

	.section __ex_table,#alloc
	.align	4
	.word	10b, 4b
Commit	Line	Data
1da177e4 LT	1	/* strncpy_from_user.S: Sparc strncpy from userspace.
	2	*
	3	* Copyright(C) 1996 David S. Miller
	4	*/
	5
	6	#include <asm/ptrace.h>
	7	#include <asm/errno.h>
	8
	9	.text
	10	.align 4
	11
	12	/* Must return:
	13	*
	14	* -EFAULT for an exception
	15	* count if we hit the buffer limit
	16	* bytes copied if we hit a null byte
	17	*/
	18
	19	.globl __strncpy_from_user
	20	__strncpy_from_user:
	21	/* %o0=dest, %o1=src, %o2=count */
	22	mov %o2, %o3
	23	1:
	24	subcc %o2, 1, %o2
	25	bneg 2f
	26	nop
	27	10:
	28	ldub [%o1], %o4
	29	add %o0, 1, %o0
	30	cmp %o4, 0
	31	add %o1, 1, %o1
	32	bne 1b
	33	stb %o4, [%o0 - 1]
	34	2:
	35	add %o2, 1, %o0
	36	retl
	37	sub %o3, %o0, %o0
	38
	39	.section .fixup,#alloc,#execinstr
	40	.align 4
	41	4:
	42	retl
	43	mov -EFAULT, %o0
	44
	45	.section __ex_table,#alloc
	46	.align 4
	47	.word 10b, 4b