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 #if defined(CONFIG_CPU_SW_DOMAIN_PAN)
17
18 .macro save_regs
19 mrc p15, 0, ip, c3, c0, 0
20 stmfd sp!, {r1, r2, r4 - r8, ip, lr}
21 uaccess_enable ip
22 .endm
23
24 .macro load_regs
25 ldmfd sp!, {r1, r2, r4 - r8, ip, lr}
26 mcr p15, 0, ip, c3, c0, 0
27 ret lr
28 .endm
29
30 #elif defined(CONFIG_CPU_TTBR0_PAN)
31
32 .macro save_regs
33 mrc p15, 0, ip, c2, c0, 2 @ read TTBCR
34 stmfd sp!, {r1, r2, r4 - r8, ip, lr}
35 uaccess_enable ip
36 .endm
37
38 .macro load_regs
39 ldmfd sp!, {r1, r2, r4 - r8, ip, lr}
40 mcr p15, 0, ip, c2, c0, 2 @ restore TTBCR
41 ret lr
42 .endm
43
44 #else
45
46 .macro save_regs
47 stmfd sp!, {r1, r2, r4 - r8, lr}
48 .endm
49
50 .macro load_regs
51 ldmfd sp!, {r1, r2, r4 - r8, pc}
52 .endm
53
54 #endif
55
56 .macro load1b, reg1
57 ldrusr \reg1, r0, 1
58 .endm
59
60 .macro load2b, reg1, reg2
61 ldrusr \reg1, r0, 1
62 ldrusr \reg2, r0, 1
63 .endm
64
65 .macro load1l, reg1
66 ldrusr \reg1, r0, 4
67 .endm
68
69 .macro load2l, reg1, reg2
70 ldrusr \reg1, r0, 4
71 ldrusr \reg2, r0, 4
72 .endm
73
74 .macro load4l, reg1, reg2, reg3, reg4
75 ldrusr \reg1, r0, 4
76 ldrusr \reg2, r0, 4
77 ldrusr \reg3, r0, 4
78 ldrusr \reg4, r0, 4
79 .endm
80
81 /*
82 * unsigned int
83 * csum_partial_copy_from_user(const char *src, char *dst, int len)
84 * r0 = src, r1 = dst, r2 = len
85 * Returns : r0 = checksum or 0
86 */
87
88 #define FN_ENTRY ENTRY(csum_partial_copy_from_user)
89 #define FN_EXIT ENDPROC(csum_partial_copy_from_user)
90
91 #include "csumpartialcopygeneric.S"
92
93 /*
94 * We report fault by returning 0 csum - impossible in normal case, since
95 * we start with 0xffffffff for initial sum.
96 */
97 .pushsection .text.fixup,"ax"
98 .align 4
99 9001: mov r0, #0
100 load_regs
101 .popsection
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