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1 | /* |
2 | * linux/arch/arm/lib/csumpartialcopyuser.S | |
3 | * | |
4 | * Copyright (C) 1995-1998 Russell King | |
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 | * 27/03/03 Ian Molton Clean up CONFIG_CPU | |
11 | * | |
12 | */ | |
13 | #include <linux/linkage.h> | |
14 | #include <asm/assembler.h> | |
15 | #include <asm/errno.h> | |
e6ae744d | 16 | #include <asm/asm-offsets.h> |
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17 | |
18 | .text | |
19 | ||
20 | .macro save_regs | |
22acc4e6 | 21 | stmfd sp!, {r1, r2, r4 - r8, lr} |
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22 | .endm |
23 | ||
90303b10 | 24 | .macro load_regs |
22acc4e6 | 25 | ldmfd sp!, {r1, r2, r4 - r8, pc} |
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26 | .endm |
27 | ||
28 | .macro load1b, reg1 | |
8b592783 | 29 | ldrusr \reg1, r0, 1 |
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30 | .endm |
31 | ||
32 | .macro load2b, reg1, reg2 | |
8b592783 CM |
33 | ldrusr \reg1, r0, 1 |
34 | ldrusr \reg2, r0, 1 | |
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35 | .endm |
36 | ||
37 | .macro load1l, reg1 | |
8b592783 | 38 | ldrusr \reg1, r0, 4 |
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39 | .endm |
40 | ||
41 | .macro load2l, reg1, reg2 | |
8b592783 CM |
42 | ldrusr \reg1, r0, 4 |
43 | ldrusr \reg2, r0, 4 | |
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44 | .endm |
45 | ||
46 | .macro load4l, reg1, reg2, reg3, reg4 | |
8b592783 CM |
47 | ldrusr \reg1, r0, 4 |
48 | ldrusr \reg2, r0, 4 | |
49 | ldrusr \reg3, r0, 4 | |
50 | ldrusr \reg4, r0, 4 | |
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51 | .endm |
52 | ||
53 | /* | |
54 | * unsigned int | |
55 | * csum_partial_copy_from_user(const char *src, char *dst, int len, int sum, int *err_ptr) | |
56 | * r0 = src, r1 = dst, r2 = len, r3 = sum, [sp] = *err_ptr | |
57 | * Returns : r0 = checksum, [[sp, #0], #0] = 0 or -EFAULT | |
58 | */ | |
59 | ||
60 | #define FN_ENTRY ENTRY(csum_partial_copy_from_user) | |
93ed3970 | 61 | #define FN_EXIT ENDPROC(csum_partial_copy_from_user) |
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62 | |
63 | #include "csumpartialcopygeneric.S" | |
64 | ||
65 | /* | |
66 | * FIXME: minor buglet here | |
67 | * We don't return the checksum for the data present in the buffer. To do | |
68 | * so properly, we would have to add in whatever registers were loaded before | |
69 | * the fault, which, with the current asm above is not predictable. | |
70 | */ | |
4260415f | 71 | .pushsection .fixup,"ax" |
1da177e4 | 72 | .align 4 |
8b592783 | 73 | 9001: mov r4, #-EFAULT |
4609a179 | 74 | ldr r5, [sp, #8*4] @ *err_ptr |
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75 | str r4, [r5] |
76 | ldmia sp, {r1, r2} @ retrieve dst, len | |
77 | add r2, r2, r1 | |
78 | mov r0, #0 @ zero the buffer | |
8b592783 | 79 | 9002: teq r2, r1 |
1da177e4 | 80 | strneb r0, [r1], #1 |
8b592783 | 81 | bne 9002b |
90303b10 | 82 | load_regs |
4260415f | 83 | .popsection |