1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | /* copy_in_user.S: Copy from userspace to userspace. |
3 | * |
4 | * Copyright (C) 1999, 2000, 2004 David S. Miller (davem@redhat.com) |
5 | */ |
6 | |
7 | #include <linux/export.h> |
8 | #include <linux/linkage.h> |
9 | #include <asm/asi.h> |
10 | |
11 | #define XCC xcc |
12 | |
13 | #define EX(x,y,z) \ |
14 | 98: x,y; \ |
15 | .section __ex_table,"a";\ |
16 | .align 4; \ |
17 | .word 98b, z; \ |
18 | .text; \ |
19 | .align 4; |
20 | |
21 | #define EX_O4(x,y) EX(x,y,__retl_o4_plus_8) |
22 | #define EX_O2_4(x,y) EX(x,y,__retl_o2_plus_4) |
23 | #define EX_O2_1(x,y) EX(x,y,__retl_o2_plus_1) |
24 | |
25 | .register %g2,#scratch |
26 | .register %g3,#scratch |
27 | |
28 | .text |
29 | __retl_o4_plus_8: |
30 | add %o4, %o2, %o4 |
31 | retl |
32 | add %o4, 8, %o0 |
33 | __retl_o2_plus_4: |
34 | retl |
35 | add %o2, 4, %o0 |
36 | __retl_o2_plus_1: |
37 | retl |
38 | add %o2, 1, %o0 |
39 | |
40 | .align 32 |
41 | |
42 | /* Don't try to get too fancy here, just nice and |
43 | * simple. This is predominantly used for well aligned |
44 | * small copies in the compat layer. It is also used |
45 | * to copy register windows around during thread cloning. |
46 | */ |
47 | |
48 | ENTRY(raw_copy_in_user) /* %o0=dst, %o1=src, %o2=len */ |
49 | cmp %o2, 0 |
50 | be,pn %XCC, 85f |
51 | or %o0, %o1, %o3 |
52 | cmp %o2, 16 |
53 | bleu,a,pn %XCC, 80f |
54 | or %o3, %o2, %o3 |
55 | |
56 | /* 16 < len <= 64 */ |
57 | andcc %o3, 0x7, %g0 |
58 | bne,pn %XCC, 90f |
59 | nop |
60 | |
61 | andn %o2, 0x7, %o4 |
62 | and %o2, 0x7, %o2 |
63 | 1: subcc %o4, 0x8, %o4 |
64 | EX_O4(ldxa [%o1] %asi, %o5) |
65 | EX_O4(stxa %o5, [%o0] %asi) |
66 | add %o1, 0x8, %o1 |
67 | bgu,pt %XCC, 1b |
68 | add %o0, 0x8, %o0 |
69 | andcc %o2, 0x4, %g0 |
70 | be,pt %XCC, 1f |
71 | nop |
72 | sub %o2, 0x4, %o2 |
73 | EX_O2_4(lduwa [%o1] %asi, %o5) |
74 | EX_O2_4(stwa %o5, [%o0] %asi) |
75 | add %o1, 0x4, %o1 |
76 | add %o0, 0x4, %o0 |
77 | 1: cmp %o2, 0 |
78 | be,pt %XCC, 85f |
79 | nop |
80 | ba,pt %xcc, 90f |
81 | nop |
82 | |
83 | 80: /* 0 < len <= 16 */ |
84 | andcc %o3, 0x3, %g0 |
85 | bne,pn %XCC, 90f |
86 | nop |
87 | |
88 | 82: |
89 | subcc %o2, 4, %o2 |
90 | EX_O2_4(lduwa [%o1] %asi, %g1) |
91 | EX_O2_4(stwa %g1, [%o0] %asi) |
92 | add %o1, 4, %o1 |
93 | bgu,pt %XCC, 82b |
94 | add %o0, 4, %o0 |
95 | |
96 | 85: retl |
97 | clr %o0 |
98 | |
99 | .align 32 |
100 | 90: |
101 | subcc %o2, 1, %o2 |
102 | EX_O2_1(lduba [%o1] %asi, %g1) |
103 | EX_O2_1(stba %g1, [%o0] %asi) |
104 | add %o1, 1, %o1 |
105 | bgu,pt %XCC, 90b |
106 | add %o0, 1, %o0 |
107 | retl |
108 | clr %o0 |
109 | ENDPROC(raw_copy_in_user) |
110 | EXPORT_SYMBOL(raw_copy_in_user) |
111 | |