1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
2 | /* |
3 | * linux/arch/arm/lib/csumpartialcopyuser.S |
4 | * |
5 | * Copyright (C) 1995-1998 Russell King |
6 | * |
7 | * 27/03/03 Ian Molton Clean up CONFIG_CPU |
8 | */ |
9 | #include <linux/linkage.h> |
10 | #include <asm/assembler.h> |
11 | #include <asm/errno.h> |
12 | #include <asm/asm-offsets.h> |
13 | |
14 | .text |
15 | |
16 | #ifdef CONFIG_CPU_SW_DOMAIN_PAN |
17 | .macro save_regs |
18 | mrc p15, 0, ip, c3, c0, 0 |
19 | stmfd sp!, {r1, r2, r4 - r8, ip, lr} |
20 | uaccess_enable ip |
21 | .endm |
22 | |
23 | .macro load_regs |
24 | ldmfd sp!, {r1, r2, r4 - r8, ip, lr} |
25 | mcr p15, 0, ip, c3, c0, 0 |
26 | ret lr |
27 | .endm |
28 | #else |
29 | .macro save_regs |
30 | stmfd sp!, {r1, r2, r4 - r8, lr} |
31 | .endm |
32 | |
33 | .macro load_regs |
34 | ldmfd sp!, {r1, r2, r4 - r8, pc} |
35 | .endm |
36 | #endif |
37 | |
38 | .macro load1b, reg1 |
39 | ldrusr \reg1, r0, 1 |
40 | .endm |
41 | |
42 | .macro load2b, reg1, reg2 |
43 | ldrusr \reg1, r0, 1 |
44 | ldrusr \reg2, r0, 1 |
45 | .endm |
46 | |
47 | .macro load1l, reg1 |
48 | ldrusr \reg1, r0, 4 |
49 | .endm |
50 | |
51 | .macro load2l, reg1, reg2 |
52 | ldrusr \reg1, r0, 4 |
53 | ldrusr \reg2, r0, 4 |
54 | .endm |
55 | |
56 | .macro load4l, reg1, reg2, reg3, reg4 |
57 | ldrusr \reg1, r0, 4 |
58 | ldrusr \reg2, r0, 4 |
59 | ldrusr \reg3, r0, 4 |
60 | ldrusr \reg4, r0, 4 |
61 | .endm |
62 | |
63 | /* |
64 | * unsigned int |
65 | * csum_partial_copy_from_user(const char *src, char *dst, int len) |
66 | * r0 = src, r1 = dst, r2 = len |
67 | * Returns : r0 = checksum or 0 |
68 | */ |
69 | |
70 | #define FN_ENTRY ENTRY(csum_partial_copy_from_user) |
71 | #define FN_EXIT ENDPROC(csum_partial_copy_from_user) |
72 | |
73 | #include "csumpartialcopygeneric.S" |
74 | |
75 | /* |
76 | * We report fault by returning 0 csum - impossible in normal case, since |
77 | * we start with 0xffffffff for initial sum. |
78 | */ |
79 | .pushsection .text.fixup,"ax" |
80 | .align 4 |
81 | 9001: mov r0, #0 |
82 | load_regs |
83 | .popsection |
84 | |