1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * linux/arch/arm/lib/io-readsl.S
4 *
5 * Copyright (C) 1995-2000 Russell King
6 */
7 #include <linux/linkage.h>
8 #include <asm/assembler.h>
9
10 ENTRY(__raw_readsl)
11 teq r2, #0 @ do we have to check for the zero len?
12 reteq lr
13 ands ip, r1, #3
14 bne 3f
15
16 subs r2, r2, #4
17 bmi 2f
18 stmfd sp!, {r4, lr}
19 1: ldr r3, [r0, #0]
20 ldr r4, [r0, #0]
21 ldr ip, [r0, #0]
22 ldr lr, [r0, #0]
23 subs r2, r2, #4
24 stmia r1!, {r3, r4, ip, lr}
25 bpl 1b
26 ldmfd sp!, {r4, lr}
27 2: movs r2, r2, lsl #31
28 ldrcs r3, [r0, #0]
29 ldrcs ip, [r0, #0]
30 stmiacs r1!, {r3, ip}
31 ldrne r3, [r0, #0]
32 strne r3, [r1, #0]
33 ret lr
34
35 3: ldr r3, [r0]
36 cmp ip, #2
37 mov ip, r3, get_byte_0
38 strb ip, [r1], #1
39 bgt 6f
40 mov ip, r3, get_byte_1
41 strb ip, [r1], #1
42 beq 5f
43 mov ip, r3, get_byte_2
44 strb ip, [r1], #1
45
46 4: subs r2, r2, #1
47 mov ip, r3, lspull #24
48 ldrne r3, [r0]
49 orrne ip, ip, r3, lspush #8
50 strne ip, [r1], #4
51 bne 4b
52 b 8f
53
54 5: subs r2, r2, #1
55 mov ip, r3, lspull #16
56 ldrne r3, [r0]
57 orrne ip, ip, r3, lspush #16
58 strne ip, [r1], #4
59 bne 5b
60 b 7f
61
62 6: subs r2, r2, #1
63 mov ip, r3, lspull #8
64 ldrne r3, [r0]
65 orrne ip, ip, r3, lspush #24
66 strne ip, [r1], #4
67 bne 6b
68
69 mov r3, ip, get_byte_2
70 strb r3, [r1, #2]
71 7: mov r3, ip, get_byte_1
72 strb r3, [r1, #1]
73 8: mov r3, ip, get_byte_0
74 strb r3, [r1, #0]
75 ret lr
76 ENDPROC(__raw_readsl)