1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * Copyright (C) 2013 Regents of the Universit
4 */
5
6 #include <linux/linkage.h>
7 #include <asm/asm.h>
8
9 /* void *memcpy(void *, const void *, size_t)
10 SYM_FUNC_START(__memcpy)
11 move t6, a0 /* Preserve return value
12
13 /* Defer to byte-oriented copy for sma
14 sltiu a3, a2, 128
15 bnez a3, 4f
16 /* Use word-oriented copy only if low-
17 andi a3, t6, SZREG-1
18 andi a4, a1, SZREG-1
19 bne a3, a4, 4f
20
21 beqz a3, 2f /* Skip if already aligne
22 /*
23 * Round to nearest double word-aligne
24 * greater than or equal to start addr
25 */
26 andi a3, a1, ~(SZREG-1)
27 addi a3, a3, SZREG
28 /* Handle initial misalignment */
29 sub a4, a3, a1
30 1:
31 lb a5, 0(a1)
32 addi a1, a1, 1
33 sb a5, 0(t6)
34 addi t6, t6, 1
35 bltu a1, a3, 1b
36 sub a2, a2, a4 /* Update count */
37
38 2:
39 andi a4, a2, ~((16*SZREG)-1)
40 beqz a4, 4f
41 add a3, a1, a4
42 3:
43 REG_L a4, 0(a1)
44 REG_L a5, SZREG(a1)
45 REG_L a6, 2*SZREG(a1)
46 REG_L a7, 3*SZREG(a1)
47 REG_L t0, 4*SZREG(a1)
48 REG_L t1, 5*SZREG(a1)
49 REG_L t2, 6*SZREG(a1)
50 REG_L t3, 7*SZREG(a1)
51 REG_L t4, 8*SZREG(a1)
52 REG_L t5, 9*SZREG(a1)
53 REG_S a4, 0(t6)
54 REG_S a5, SZREG(t6)
55 REG_S a6, 2*SZREG(t6)
56 REG_S a7, 3*SZREG(t6)
57 REG_S t0, 4*SZREG(t6)
58 REG_S t1, 5*SZREG(t6)
59 REG_S t2, 6*SZREG(t6)
60 REG_S t3, 7*SZREG(t6)
61 REG_S t4, 8*SZREG(t6)
62 REG_S t5, 9*SZREG(t6)
63 REG_L a4, 10*SZREG(a1)
64 REG_L a5, 11*SZREG(a1)
65 REG_L a6, 12*SZREG(a1)
66 REG_L a7, 13*SZREG(a1)
67 REG_L t0, 14*SZREG(a1)
68 REG_L t1, 15*SZREG(a1)
69 addi a1, a1, 16*SZREG
70 REG_S a4, 10*SZREG(t6)
71 REG_S a5, 11*SZREG(t6)
72 REG_S a6, 12*SZREG(t6)
73 REG_S a7, 13*SZREG(t6)
74 REG_S t0, 14*SZREG(t6)
75 REG_S t1, 15*SZREG(t6)
76 addi t6, t6, 16*SZREG
77 bltu a1, a3, 3b
78 andi a2, a2, (16*SZREG)-1 /* Update c
79
80 4:
81 /* Handle trailing misalignment */
82 beqz a2, 6f
83 add a3, a1, a2
84
85 /* Use word-oriented copy if co-aligne
86 or a5, a1, t6
87 or a5, a5, a3
88 andi a5, a5, 3
89 bnez a5, 5f
90 7:
91 lw a4, 0(a1)
92 addi a1, a1, 4
93 sw a4, 0(t6)
94 addi t6, t6, 4
95 bltu a1, a3, 7b
96
97 ret
98
99 5:
100 lb a4, 0(a1)
101 addi a1, a1, 1
102 sb a4, 0(t6)
103 addi t6, t6, 1
104 bltu a1, a3, 5b
105 6:
106 ret
107 SYM_FUNC_END(__memcpy)
108 SYM_FUNC_ALIAS_WEAK(memcpy, __memcpy)
109 SYM_FUNC_ALIAS(__pi_memcpy, __memcpy)
110 SYM_FUNC_ALIAS(__pi___memcpy, __memcpy)
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