xref: /haiku/src/system/libroot/posix/string/arch/arm/arch_string.S (revision bddcee2a27042b4d8d6b0142b466f30abc886648) 
1/*
2 * Copyright 2018, Haiku, Inc. All rights reserved.
3 * Distributed under the terms of the MIT License.
4 */
5
6#include <asm_defs.h>
7
8
9.align 4
10FUNCTION(memcpy):
11FUNCTION(__aeabi_memcpy):
12        push    {r4, r5, r6, r7, r8, r10, r11, lr}
13        add     r11, sp, #24
14        cmp     r0, r1
15        cmpne   r2, #0
16        bne     .LBB0_2
17.LBB0_1:
18        pop     {r4, r5, r6, r7, r8, r10, r11, pc}
19.LBB0_2:
20        orr     r3, r1, r0
21        tst     r3, #3
22        beq     .LBB0_9
23        eor     r3, r1, r0
24        and     r7, r0, #3
25        tst     r3, #3
26        mov     r12, r2
27        rsbeq   r12, r7, #4
28        cmp     r2, #4
29        movlo   r12, r2
30        sub     r2, r2, r12
31        cmp     r12, #1
32        blt     .LBB0_9
33        mvn     r7, r12
34        cmn     r7, #2
35        mvn     r3, #1
36        mvn     r6, #1
37        movgt   r3, r7
38        add     r3, r12, r3
39        add     r3, r3, #2
40        cmp     r3, #16
41        blo     .LBB0_22
42        cmn     r7, #2
43        movgt   r6, r7
44        add     r7, r12, r6
45        add     r7, r7, #2
46        add     r6, r1, r7
47        cmp     r6, r0
48        addhi   r7, r0, r7
49        cmphi   r7, r1
50        bhi     .LBB0_22
51        bic     r4, r3, #15
52        mov     r7, r0
53        add     r5, r0, r4
54        add     lr, r1, r4
55        sub     r12, r12, r4
56        mov     r6, r4
57.LBB0_7:
58        vld1.8  {d16, d17}, [r1]!
59        subs    r6, r6, #16
60        vst1.8  {d16, d17}, [r7]!
61        bne     .LBB0_7
62        cmp     r3, r4
63        bne     .LBB0_23
64        b       .LBB0_25
65.LBB0_9:
66        mov     r5, r0
67        mov     r3, #0
68        cmp     r3, r2, lsr #2
69        beq     .LBB0_19
70.LBB0_10:
71        bic     r12, r2, #3
72        lsr     r3, r2, #2
73        cmp     r2, #16
74        blo     .LBB0_15
75        add     r7, r1, r12
76        cmp     r5, r7
77        addlo   r7, r5, r12
78        cmplo   r1, r7
79        blo     .LBB0_15
80        and     lr, r3, #3
81        mov     r7, r1
82        sub     r8, r3, lr
83        mov     r6, r5
84        sub     r3, r12, lr, lsl #2
85        add     r4, r5, r3
86        add     r3, r1, r3
87.LBB0_13:
88        vld1.32 {d16, d17}, [r7]!
89        subs    r8, r8, #4
90        vst1.32 {d16, d17}, [r6]!
91        bne     .LBB0_13
92        cmp     lr, #0
93        bne     .LBB0_16
94        b       .LBB0_18
95.LBB0_15:
96        mov     lr, r3
97        mov     r3, r1
98        mov     r4, r5
99.LBB0_16:
100        add     r6, lr, #1
101.LBB0_17:
102        ldr     r7, [r3], #4
103        sub     r6, r6, #1
104        str     r7, [r4], #4
105        cmp     r6, #1
106        bgt     .LBB0_17
107.LBB0_18:
108        add     r5, r5, r12
109        add     r1, r1, r12
110.LBB0_19:
111        ands    r2, r2, #3
112        beq     .LBB0_1
113        add     r2, r2, #1
114.LBB0_21:
115        ldrb    r3, [r1], #1
116        sub     r2, r2, #1
117        strb    r3, [r5], #1
118        cmp     r2, #1
119        bgt     .LBB0_21
120        b       .LBB0_1
121.LBB0_22:
122        mov     lr, r1
123        mov     r5, r0
124.LBB0_23:
125        add     r1, r12, #1
126.LBB0_24:
127        ldrb    r3, [lr], #1
128        sub     r1, r1, #1
129        strb    r3, [r5], #1
130        cmp     r1, #1
131        bgt     .LBB0_24
132.LBB0_25:
133        mov     r1, lr
134        mov     r3, #0
135        cmp     r3, r2, lsr #2
136        bne     .LBB0_10
137        b       .LBB0_19
138FUNCTION_END(memcpy)
139FUNCTION_END(__aeabi_memcpy)
140