1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
2 | /* |
3 | * linux/arch/arm/lib/io-writesw-armv4.S |
4 | * |
5 | * Copyright (C) 1995-2000 Russell King |
6 | */ |
7 | #include <linux/linkage.h> |
8 | #include <asm/assembler.h> |
9 | |
10 | .macro outword, rd |
11 | #ifndef __ARMEB__ |
12 | strh \rd, [r0] |
13 | mov \rd, \rd, lsr #16 |
14 | strh \rd, [r0] |
15 | #else |
16 | mov lr, \rd, lsr #16 |
17 | strh lr, [r0] |
18 | strh \rd, [r0] |
19 | #endif |
20 | .endm |
21 | |
22 | .Loutsw_align: movs ip, r1, lsl #31 |
23 | bne .Loutsw_noalign |
24 | |
25 | ldrh r3, [r1], #2 |
26 | sub r2, r2, #1 |
27 | strh r3, [r0] |
28 | |
29 | ENTRY(__raw_writesw) |
30 | teq r2, #0 |
31 | reteq lr |
32 | ands r3, r1, #3 |
33 | bne .Loutsw_align |
34 | |
35 | stmfd sp!, {r4, r5, lr} |
36 | |
37 | subs r2, r2, #8 |
38 | bmi .Lno_outsw_8 |
39 | |
40 | .Loutsw_8_lp: ldmia r1!, {r3, r4, r5, ip} |
41 | subs r2, r2, #8 |
42 | outword r3 |
43 | outword r4 |
44 | outword r5 |
45 | outword ip |
46 | bpl .Loutsw_8_lp |
47 | |
48 | .Lno_outsw_8: tst r2, #4 |
49 | beq .Lno_outsw_4 |
50 | |
51 | ldmia r1!, {r3, ip} |
52 | outword r3 |
53 | outword ip |
54 | |
55 | .Lno_outsw_4: movs r2, r2, lsl #31 |
56 | bcc .Lno_outsw_2 |
57 | |
58 | ldr r3, [r1], #4 |
59 | outword r3 |
60 | |
61 | .Lno_outsw_2: ldrhne r3, [r1] |
62 | strhne r3, [r0] |
63 | |
64 | ldmfd sp!, {r4, r5, pc} |
65 | |
66 | #ifdef __ARMEB__ |
67 | #define pull_hbyte0 lsl #8 |
68 | #define push_hbyte1 lsr #24 |
69 | #else |
70 | #define pull_hbyte0 lsr #24 |
71 | #define push_hbyte1 lsl #8 |
72 | #endif |
73 | |
74 | .Loutsw_noalign: |
75 | ARM( ldr r3, [r1, -r3]! ) |
76 | THUMB( rsb r3, r3, #0 ) |
77 | THUMB( ldr r3, [r1, r3] ) |
78 | THUMB( sub r1, r3 ) |
79 | subcs r2, r2, #1 |
80 | bcs 2f |
81 | subs r2, r2, #2 |
82 | bmi 3f |
83 | |
84 | 1: mov ip, r3, lsr #8 |
85 | strh ip, [r0] |
86 | 2: mov ip, r3, pull_hbyte0 |
87 | ldr r3, [r1, #4]! |
88 | subs r2, r2, #2 |
89 | orr ip, ip, r3, push_hbyte1 |
90 | strh ip, [r0] |
91 | bpl 1b |
92 | |
93 | tst r2, #1 |
94 | 3: movne ip, r3, lsr #8 |
95 | strhne ip, [r0] |
96 | ret lr |
97 | ENDPROC(__raw_writesw) |
98 | |