1/*
 2 * This file is subject to the terms and conditions of the GNU General Public
 3 * License.  See the file "COPYING" in the main directory of this archive
 4 * for more details.
 5 *
 6 * Copyright (C) 1996, 1999 by Ralf Baechle
 7 * Copyright (C) 2011 MIPS Technologies, Inc.
 8 */
 9#include <linux/errno.h>
10#include <asm/asm.h>
11#include <asm/asm-offsets.h>
12#include <asm/export.h>
13#include <asm/regdef.h>
14
15#define EX(insn,reg,addr,handler)			\
169:	insn	reg, addr;				\
17	.section __ex_table,"a";			\
18	PTR_WD	9b, handler;				\
19	.previous
20
21/*
22 * Returns: -EFAULT if exception before terminator, N if the entire
23 * buffer filled, else strlen.
24 */
25
26/*
27 * Ugly special case have to check: we might get passed a user space
28 * pointer which wraps into the kernel space.  We don't deal with that.	 If
29 * it happens at most some bytes of the exceptions handlers will be copied.
30 */
31
32LEAF(__strncpy_from_user_asm)
 
 
 
 
 
 
33	move		t0, zero
34	move		v1, a1
35#ifdef CONFIG_EVA
36	.set push
37	.set eva
381:	EX(lbue, v0, (v1), .Lfault)
39	.set pop
40#else
411:	EX(lbu, v0, (v1), .Lfault)
42#endif
43	PTR_ADDIU	v1, 1
44	R10KCBARRIER(0(ra))
45	sb		v0, (a0)
46	beqz		v0, 2f
47	PTR_ADDIU	t0, 1
48	PTR_ADDIU	a0, 1
49	bne		t0, a2, 1b
502:	PTR_ADDU	v0, a1, t0
51	xor		v0, a1
52	bltz		v0, .Lfault
53	move		v0, t0
54	jr		ra			# return n
55	END(__strncpy_from_user_asm)
56
57.Lfault:
58	li		v0, -EFAULT
59	jr		ra
60
61	.section	__ex_table,"a"
62	PTR_WD		1b, .Lfault
63	.previous
64
65	EXPORT_SYMBOL(__strncpy_from_user_asm)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

 1/*
 2 * This file is subject to the terms and conditions of the GNU General Public
 3 * License.  See the file "COPYING" in the main directory of this archive
 4 * for more details.
 5 *
 6 * Copyright (C) 1996, 1999 by Ralf Baechle
 7 * Copyright (C) 2011 MIPS Technologies, Inc.
 8 */
 9#include <linux/errno.h>
10#include <asm/asm.h>
11#include <asm/asm-offsets.h>
 
12#include <asm/regdef.h>
13
14#define EX(insn,reg,addr,handler)			\
159:	insn	reg, addr;				\
16	.section __ex_table,"a";			\
17	PTR	9b, handler;				\
18	.previous
19
20/*
21 * Returns: -EFAULT if exception before terminator, N if the entire
22 * buffer filled, else strlen.
23 */
24
25/*
26 * Ugly special case have to check: we might get passed a user space
27 * pointer which wraps into the kernel space.  We don't deal with that.	 If
28 * it happens at most some bytes of the exceptions handlers will be copied.
29 */
30
31	.macro __BUILD_STRNCPY_ASM func
32LEAF(__strncpy_from_\func\()_asm)
33	LONG_L		v0, TI_ADDR_LIMIT($28)	# pointer ok?
34	and		v0, a1
35	bnez		v0, .Lfault\@
36
37FEXPORT(__strncpy_from_\func\()_nocheck_asm)
38	move		t0, zero
39	move		v1, a1
40.ifeqs "\func","kernel"
411:	EX(lbu, v0, (v1), .Lfault\@)
42.else
431:	EX(lbue, v0, (v1), .Lfault\@)
44.endif
 
 
 
45	PTR_ADDIU	v1, 1
46	R10KCBARRIER(0(ra))
47	sb		v0, (a0)
48	beqz		v0, 2f
49	PTR_ADDIU	t0, 1
50	PTR_ADDIU	a0, 1
51	bne		t0, a2, 1b
522:	PTR_ADDU	v0, a1, t0
53	xor		v0, a1
54	bltz		v0, .Lfault\@
55	move		v0, t0
56	jr		ra			# return n
57	END(__strncpy_from_\func\()_asm)
58
59.Lfault\@:
60	li		v0, -EFAULT
61	jr		ra
62
63	.section	__ex_table,"a"
64	PTR		1b, .Lfault\@
65	.previous
66
67	.endm
68
69#ifndef CONFIG_EVA
70	/* Set aliases */
71	.global __strncpy_from_user_asm
72	.global __strncpy_from_user_nocheck_asm
73	.set __strncpy_from_user_asm, __strncpy_from_kernel_asm
74	.set __strncpy_from_user_nocheck_asm, __strncpy_from_kernel_nocheck_asm
75#endif
76
77__BUILD_STRNCPY_ASM kernel
78
79#ifdef CONFIG_EVA
80	.set push
81	.set eva
82__BUILD_STRNCPY_ASM user
83	.set pop
84#endif