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224cd129 JB |
1 | /* |
2 | * OpenRISC string.S | |
3 | * | |
4 | * Linux architectural port borrowing liberally from similar works of | |
5 | * others. All original copyrights apply as per the original source | |
6 | * declaration. | |
7 | * | |
8 | * Modifications for the OpenRISC architecture: | |
9 | * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com> | |
10 | * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se> | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or | |
13 | * modify it under the terms of the GNU General Public License | |
14 | * as published by the Free Software Foundation; either version | |
15 | * 2 of the License, or (at your option) any later version. | |
16 | */ | |
17 | ||
18 | #include <linux/linkage.h> | |
19 | #include <asm/errno.h> | |
20 | ||
21 | /* | |
22 | * this can be optimized by doing gcc inline assemlby with | |
23 | * proper constraints (no need to save args registers...) | |
24 | * | |
25 | */ | |
26 | ||
27 | ||
28 | /* | |
29 | * | |
30 | * int __copy_tofrom_user(void *to, const void *from, unsigned long size); | |
31 | * | |
32 | * NOTE: it returns number of bytes NOT copied !!! | |
33 | * | |
34 | */ | |
35 | .global __copy_tofrom_user | |
36 | __copy_tofrom_user: | |
37 | l.addi r1,r1,-12 | |
38 | l.sw 0(r1),r6 | |
39 | l.sw 4(r1),r4 | |
40 | l.sw 8(r1),r3 | |
41 | ||
42 | l.addi r11,r5,0 | |
43 | 2: l.sfeq r11,r0 | |
44 | l.bf 1f | |
45 | l.addi r11,r11,-1 | |
46 | 8: l.lbz r6,0(r4) | |
47 | 9: l.sb 0(r3),r6 | |
48 | l.addi r3,r3,1 | |
49 | l.j 2b | |
50 | l.addi r4,r4,1 | |
51 | 1: | |
52 | l.addi r11,r11,1 // r11 holds the return value | |
53 | ||
54 | l.lwz r6,0(r1) | |
55 | l.lwz r4,4(r1) | |
56 | l.lwz r3,8(r1) | |
57 | l.jr r9 | |
58 | l.addi r1,r1,12 | |
59 | ||
60 | .section .fixup, "ax" | |
61 | 99: | |
62 | l.j 1b | |
63 | l.nop | |
64 | .previous | |
65 | ||
66 | .section __ex_table, "a" | |
67 | .long 8b, 99b // read fault | |
68 | .long 9b, 99b // write fault | |
69 | .previous | |
70 | ||
71 | /* | |
72 | * unsigned long clear_user(void *addr, unsigned long size) ; | |
73 | * | |
74 | * NOTE: it returns number of bytes NOT cleared !!! | |
75 | */ | |
76 | .global __clear_user | |
77 | __clear_user: | |
78 | l.addi r1,r1,-8 | |
79 | l.sw 0(r1),r4 | |
80 | l.sw 4(r1),r3 | |
81 | ||
82 | 2: l.sfeq r4,r0 | |
83 | l.bf 1f | |
84 | l.addi r4,r4,-1 | |
85 | 9: l.sb 0(r3),r0 | |
86 | l.j 2b | |
87 | l.addi r3,r3,1 | |
88 | ||
89 | 1: | |
90 | l.addi r11,r4,1 | |
91 | ||
92 | l.lwz r4,0(r1) | |
93 | l.lwz r3,4(r1) | |
94 | l.jr r9 | |
95 | l.addi r1,r1,8 | |
96 | ||
97 | .section .fixup, "ax" | |
98 | 99: | |
99 | l.j 1b | |
100 | l.nop | |
101 | .previous | |
102 | ||
103 | .section __ex_table, "a" | |
104 | .long 9b, 99b // write fault | |
105 | .previous |