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, 1998, 1999, 2004 by Ralf Baechle
 7 * Copyright (c) 1999 Silicon Graphics, Inc.
 8 */
 9#include <asm/asm.h>
10#include <asm/asm-offsets.h>
11#include <asm/export.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_WD	9b, handler;				\
18	.previous
19
20/*
21 * Return the size of a string including the ending NUL character up to a
22 * maximum of a1 or 0 in case of error.
23 *
24 * Note: for performance reasons we deliberately accept that a user may
25 *	 make strlen_user and strnlen_user access the first few KSEG0
26 *	 bytes.	 There's nothing secret there.	On 64-bit accessing beyond
27 *	 the maximum is a tad hairier ...
28 */
29LEAF(__strnlen_user_asm)
 
 
 
 
 
 
30	move		v0, a0
31	PTR_ADDU	a1, a0			# stop pointer
321:
33#ifdef CONFIG_CPU_DADDI_WORKAROUNDS
34	.set		noat
35	li		AT, 1
36#endif
37	beq		v0, a1, 1f		# limit reached?
38#ifdef CONFIG_EVA
39	.set push
40	.set eva
41	EX(lbe, t0, (v0), .Lfault)
42	.set pop
43#else
44	EX(lb, t0, (v0), .Lfault)
45#endif
46	.set		noreorder
47	bnez		t0, 1b
481:
49#ifndef CONFIG_CPU_DADDI_WORKAROUNDS
50	 PTR_ADDIU	v0, 1
51#else
52	 PTR_ADDU	v0, AT
53	.set		at
54#endif
55	.set		reorder
56	PTR_SUBU	v0, a0
57	jr		ra
58	END(__strnlen_user_asm)
59
60.Lfault:
61	move		v0, zero
62	jr		ra
 
63
64	EXPORT_SYMBOL(__strnlen_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, 1998, 1999, 2004 by Ralf Baechle
 7 * Copyright (c) 1999 Silicon Graphics, Inc.
 8 */
 9#include <asm/asm.h>
10#include <asm/asm-offsets.h>
 
11#include <asm/regdef.h>
12
13#define EX(insn,reg,addr,handler)			\
149:	insn	reg, addr;				\
15	.section __ex_table,"a";			\
16	PTR	9b, handler;				\
17	.previous
18
19/*
20 * Return the size of a string including the ending NUL character up to a
21 * maximum of a1 or 0 in case of error.
22 *
23 * Note: for performance reasons we deliberately accept that a user may
24 *	 make strlen_user and strnlen_user access the first few KSEG0
25 *	 bytes.	 There's nothing secret there.	On 64-bit accessing beyond
26 *	 the maximum is a tad hairier ...
27 */
28	.macro __BUILD_STRNLEN_ASM func
29LEAF(__strnlen_\func\()_asm)
30	LONG_L		v0, TI_ADDR_LIMIT($28)	# pointer ok?
31	and		v0, a0
32	bnez		v0, .Lfault\@
33
34FEXPORT(__strnlen_\func\()_nocheck_asm)
35	move		v0, a0
36	PTR_ADDU	a1, a0			# stop pointer
371:	beq		v0, a1, 1f		# limit reached?
38.ifeqs "\func", "kernel"
39	EX(lb, t0, (v0), .Lfault\@)
40.else
41	EX(lbe, t0, (v0), .Lfault\@)
42.endif
43	PTR_ADDIU	v0, 1
 
 
 
 
 
 
 
 
44	bnez		t0, 1b
451:	PTR_SUBU	v0, a0
 
 
 
 
 
 
 
 
46	jr		ra
47	END(__strnlen_\func\()_asm)
48
49.Lfault\@:
50	move		v0, zero
51	jr		ra
52	.endm
53
54#ifndef CONFIG_EVA
55	/* Set aliases */
56	.global __strnlen_user_asm
57	.global __strnlen_user_nocheck_asm
58	.set __strnlen_user_asm, __strnlen_kernel_asm
59	.set __strnlen_user_nocheck_asm, __strnlen_kernel_nocheck_asm
60#endif
61
62__BUILD_STRNLEN_ASM kernel
63
64#ifdef CONFIG_EVA
65
66	.set push
67	.set eva
68__BUILD_STRNLEN_ASM user
69	.set pop
70#endif