Commit | Line | Data |
---|---|---|
5f97f7f9 HS |
1 | /* |
2 | * Copy to/from userspace with optional address space checking. | |
3 | * | |
4 | * Copyright 2004-2006 Atmel Corporation | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
10 | #include <asm/page.h> | |
11 | #include <asm/thread_info.h> | |
12 | #include <asm/processor.h> | |
13 | #include <asm/asm.h> | |
14 | ||
15 | .text | |
16 | .align 1 | |
17 | .global strnlen_user | |
18 | .type strnlen_user, "function" | |
19 | strnlen_user: | |
20 | branch_if_kernel r8, __strnlen_user | |
21 | sub r8, r11, 1 | |
22 | add r8, r12 | |
23 | retcs 0 | |
24 | brmi adjust_length /* do a closer inspection */ | |
25 | ||
26 | .global __strnlen_user | |
27 | .type __strnlen_user, "function" | |
28 | __strnlen_user: | |
29 | mov r10, r12 | |
30 | ||
31 | 10: ld.ub r8, r12++ | |
32 | cp.w r8, 0 | |
33 | breq 2f | |
34 | sub r11, 1 | |
35 | brne 10b | |
36 | ||
37 | sub r12, -1 | |
38 | 2: sub r12, r10 | |
39 | retal r12 | |
40 | ||
41 | ||
42 | .type adjust_length, "function" | |
43 | adjust_length: | |
44 | cp.w r12, 0 /* addr must always be < TASK_SIZE */ | |
45 | retmi 0 | |
46 | ||
47 | pushm lr | |
48 | lddpc lr, _task_size | |
49 | sub r11, lr, r12 | |
50 | mov r9, r11 | |
8d29b7b9 | 51 | call __strnlen_user |
5f97f7f9 HS |
52 | cp.w r12, r9 |
53 | brgt 1f | |
54 | popm pc | |
55 | 1: popm pc, r12=0 | |
56 | ||
57 | .align 2 | |
58 | _task_size: | |
59 | .long TASK_SIZE | |
60 | ||
61 | .section .fixup, "ax" | |
62 | .align 1 | |
63 | 19: retal 0 | |
64 | ||
65 | .section __ex_table, "a" | |
66 | .align 2 | |
67 | .long 10b, 19b |