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1da177e4 LT |
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> | |
048eb582 | 10 | #include <asm/asm-offsets.h> |
1da177e4 LT |
11 | #include <asm/regdef.h> |
12 | ||
13 | #define EX(insn,reg,addr,handler) \ | |
14 | 9: insn reg, addr; \ | |
15 | .section __ex_table,"a"; \ | |
16 | PTR 9b, handler; \ | |
17 | .previous | |
18 | ||
19 | /* | |
25985edc | 20 | * Return the size of a string including the ending NUL character up to a |
1da177e4 LT |
21 | * maximum of a1 or 0 in case of error. |
22 | * | |
23 | * Note: for performance reasons we deliberately accept that a user may | |
70342287 RB |
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 ... | |
1da177e4 | 27 | */ |
c48be43e MC |
28 | .macro __BUILD_STRNLEN_ASM func |
29 | LEAF(__strnlen_\func\()_asm) | |
1da177e4 LT |
30 | LONG_L v0, TI_ADDR_LIMIT($28) # pointer ok? |
31 | and v0, a0 | |
c48be43e | 32 | bnez v0, .Lfault\@ |
1da177e4 | 33 | |
c48be43e | 34 | FEXPORT(__strnlen_\func\()_nocheck_asm) |
1da177e4 LT |
35 | move v0, a0 |
36 | PTR_ADDU a1, a0 # stop pointer | |
c4fca4fd MR |
37 | 1: |
38 | #ifdef CONFIG_CPU_DADDI_WORKAROUNDS | |
39 | .set noat | |
40 | li AT, 1 | |
41 | #endif | |
42 | beq v0, a1, 1f # limit reached? | |
4968db4b | 43 | .ifeqs "\func", "kernel" |
c48be43e | 44 | EX(lb, t0, (v0), .Lfault\@) |
4968db4b MC |
45 | .else |
46 | EX(lbe, t0, (v0), .Lfault\@) | |
47 | .endif | |
00977610 | 48 | .set noreorder |
1da177e4 | 49 | bnez t0, 1b |
c4fca4fd MR |
50 | 1: |
51 | #ifndef CONFIG_CPU_DADDI_WORKAROUNDS | |
52 | PTR_ADDIU v0, 1 | |
53 | #else | |
54 | PTR_ADDU v0, AT | |
55 | .set at | |
56 | #endif | |
00977610 RB |
57 | .set reorder |
58 | PTR_SUBU v0, a0 | |
1da177e4 | 59 | jr ra |
c48be43e | 60 | END(__strnlen_\func\()_asm) |
1da177e4 | 61 | |
c48be43e | 62 | .Lfault\@: |
c5ec1983 | 63 | move v0, zero |
1da177e4 | 64 | jr ra |
c48be43e MC |
65 | .endm |
66 | ||
4968db4b MC |
67 | #ifndef CONFIG_EVA |
68 | /* Set aliases */ | |
69 | .global __strnlen_user_asm | |
70 | .global __strnlen_user_nocheck_asm | |
71 | .set __strnlen_user_asm, __strnlen_kernel_asm | |
72 | .set __strnlen_user_nocheck_asm, __strnlen_kernel_nocheck_asm | |
73 | #endif | |
74 | ||
75 | __BUILD_STRNLEN_ASM kernel | |
76 | ||
77 | #ifdef CONFIG_EVA | |
78 | ||
79 | .set push | |
80 | .set eva | |
c48be43e | 81 | __BUILD_STRNLEN_ASM user |
4968db4b MC |
82 | .set pop |
83 | #endif |