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1da177e4 LT |
1 | /* |
2 | * __put_user functions. | |
3 | * | |
4 | * (C) Copyright 1998 Linus Torvalds | |
5 | * (C) Copyright 2001 Hirokazu Takata | |
6 | * | |
7 | * These functions have a non-standard call interface | |
8 | * to make them more efficient. | |
9 | */ | |
10 | ||
11 | #include <linux/config.h> | |
12 | ||
13 | /* | |
14 | * __put_user_X | |
15 | * | |
16 | * Inputs: r0 contains the address | |
17 | * r1 contains the value | |
18 | * | |
19 | * Outputs: r0 is error code (0 or -EFAULT) | |
20 | * r1 is corrupted (will contain "current_task"). | |
21 | * | |
22 | * These functions should not modify any other registers, | |
23 | * as they get called from within inline assembly. | |
24 | */ | |
25 | ||
26 | #ifdef CONFIG_ISA_DUAL_ISSUE | |
27 | ||
28 | .text | |
29 | .balign 4 | |
30 | .globl __put_user_1 | |
31 | __put_user_1: | |
32 | 1: stb r1, @r0 || ldi r0, #0 | |
33 | jmp r14 | |
34 | ||
35 | .balign 4 | |
36 | .globl __put_user_2 | |
37 | __put_user_2: | |
38 | 2: sth r1, @r0 || ldi r0, #0 | |
39 | jmp r14 | |
40 | ||
41 | .balign 4 | |
42 | .globl __put_user_4 | |
43 | __put_user_4: | |
44 | 3: st r1, @r0 || ldi r0, #0 | |
45 | jmp r14 | |
46 | ||
47 | bad_put_user: | |
48 | ldi r0, #-14 || jmp r14 | |
49 | ||
50 | #else /* not CONFIG_ISA_DUAL_ISSUE */ | |
51 | ||
52 | .text | |
53 | .balign 4 | |
54 | .globl __put_user_1 | |
55 | __put_user_1: | |
56 | 1: stb r1, @r0 | |
57 | ldi r0, #0 | |
58 | jmp r14 | |
59 | ||
60 | .balign 4 | |
61 | .globl __put_user_2 | |
62 | __put_user_2: | |
63 | 2: sth r1, @r0 | |
64 | ldi r0, #0 | |
65 | jmp r14 | |
66 | ||
67 | .balign 4 | |
68 | .globl __put_user_4 | |
69 | __put_user_4: | |
70 | 3: st r1, @r0 | |
71 | ldi r0, #0 | |
72 | jmp r14 | |
73 | ||
74 | bad_put_user: | |
75 | ldi r0, #-14 | |
76 | jmp r14 | |
77 | ||
78 | #endif /* not CONFIG_ISA_DUAL_ISSUE */ | |
79 | ||
80 | .section __ex_table,"a" | |
81 | .long 1b,bad_put_user | |
82 | .long 2b,bad_put_user | |
83 | .long 3b,bad_put_user | |
84 | .previous |