1 /*
2 * This file is subject to the terms and condi
3 * License. See the file "COPYING" in the mai
4 * for more details.
5 *
6 * Copyright (c) 1996, 1998, 1999, 2004 by Ral
7 * Copyright (c) 1999 Silicon Graphics, Inc.
8 */
9 #include <linux/export.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)
15 9: 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 e
22 * maximum of a1 or 0 in case of error.
23 *
24 * Note: for performance reasons we deliberate
25 * make strlen_user and strnlen_user acc
26 * bytes. There's nothing secret there.
27 * the maximum is a tad hairier ...
28 */
29 LEAF(__strnlen_user_asm)
30 move v0, a0
31 PTR_ADDU a1, a0
32 1:
33 #ifdef CONFIG_CPU_DADDI_WORKAROUNDS
34 .set noat
35 li AT, 1
36 #endif
37 beq v0, a1, 1f
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
48 1:
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)
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