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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | /* linux/arch/sparc/lib/memset.S: Sparc optimized memset, bzero and clear_user code |
3 | * Copyright (C) 1991,1996 Free Software Foundation | |
4 | * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz) | |
5 | * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu) | |
6 | * | |
74cad25c AL |
7 | * Calls to memset returns initial %o0. Calls to bzero returns 0, if ok, and |
8 | * number of bytes not yet set if exception occurs and we were called as | |
9 | * clear_user. | |
1da177e4 LT |
10 | */ |
11 | ||
12 | #include <asm/ptrace.h> | |
d3867f04 | 13 | #include <asm/export.h> |
1da177e4 LT |
14 | |
15 | /* Work around cpp -rob */ | |
16 | #define ALLOC #alloc | |
17 | #define EXECINSTR #execinstr | |
18 | #define EX(x,y,a,b) \ | |
19 | 98: x,y; \ | |
20 | .section .fixup,ALLOC,EXECINSTR; \ | |
21 | .align 4; \ | |
e51ea544 | 22 | 99: retl; \ |
1da177e4 LT |
23 | a, b, %o0; \ |
24 | .section __ex_table,ALLOC; \ | |
25 | .align 4; \ | |
26 | .word 98b, 99b; \ | |
27 | .text; \ | |
28 | .align 4 | |
29 | ||
df06c27e AV |
30 | #define STORE(source, base, offset, n) \ |
31 | 98: std source, [base + offset + n]; \ | |
32 | .section .fixup,ALLOC,EXECINSTR; \ | |
33 | .align 4; \ | |
34 | 99: ba 30f; \ | |
35 | sub %o3, n - offset, %o3; \ | |
1da177e4 LT |
36 | .section __ex_table,ALLOC; \ |
37 | .align 4; \ | |
df06c27e | 38 | .word 98b, 99b; \ |
1da177e4 | 39 | .text; \ |
df06c27e AV |
40 | .align 4; |
41 | ||
42 | #define STORE_LAST(source, base, offset, n) \ | |
43 | EX(std source, [base - offset - n], \ | |
44 | add %o1, offset + n); | |
1da177e4 LT |
45 | |
46 | /* Please don't change these macros, unless you change the logic | |
47 | * in the .fixup section below as well. | |
48 | * Store 64 bytes at (BASE + OFFSET) using value SOURCE. */ | |
df06c27e AV |
49 | #define ZERO_BIG_BLOCK(base, offset, source) \ |
50 | STORE(source, base, offset, 0x00); \ | |
51 | STORE(source, base, offset, 0x08); \ | |
52 | STORE(source, base, offset, 0x10); \ | |
53 | STORE(source, base, offset, 0x18); \ | |
54 | STORE(source, base, offset, 0x20); \ | |
55 | STORE(source, base, offset, 0x28); \ | |
56 | STORE(source, base, offset, 0x30); \ | |
57 | STORE(source, base, offset, 0x38); | |
1da177e4 LT |
58 | |
59 | #define ZERO_LAST_BLOCKS(base, offset, source) \ | |
df06c27e AV |
60 | STORE_LAST(source, base, offset, 0x38); \ |
61 | STORE_LAST(source, base, offset, 0x30); \ | |
62 | STORE_LAST(source, base, offset, 0x28); \ | |
63 | STORE_LAST(source, base, offset, 0x20); \ | |
64 | STORE_LAST(source, base, offset, 0x18); \ | |
65 | STORE_LAST(source, base, offset, 0x10); \ | |
66 | STORE_LAST(source, base, offset, 0x08); \ | |
67 | STORE_LAST(source, base, offset, 0x00); | |
1da177e4 LT |
68 | |
69 | .text | |
70 | .align 4 | |
71 | ||
72 | .globl __bzero_begin | |
73 | __bzero_begin: | |
74 | ||
4d14a459 | 75 | .globl __bzero |
f5a651f1 | 76 | .type __bzero,#function |
1da177e4 | 77 | .globl memset |
d3867f04 AV |
78 | EXPORT_SYMBOL(__bzero) |
79 | EXPORT_SYMBOL(memset) | |
1da177e4 | 80 | memset: |
74cad25c AL |
81 | mov %o0, %g1 |
82 | mov 1, %g4 | |
1da177e4 LT |
83 | and %o1, 0xff, %g3 |
84 | sll %g3, 8, %g2 | |
85 | or %g3, %g2, %g3 | |
86 | sll %g3, 16, %g2 | |
87 | or %g3, %g2, %g3 | |
88 | b 1f | |
89 | mov %o2, %o1 | |
90 | 3: | |
91 | cmp %o2, 3 | |
92 | be 2f | |
93 | EX(stb %g3, [%o0], sub %o1, 0) | |
94 | ||
95 | cmp %o2, 2 | |
96 | be 2f | |
97 | EX(stb %g3, [%o0 + 0x01], sub %o1, 1) | |
98 | ||
99 | EX(stb %g3, [%o0 + 0x02], sub %o1, 2) | |
100 | 2: | |
101 | sub %o2, 4, %o2 | |
102 | add %o1, %o2, %o1 | |
103 | b 4f | |
104 | sub %o0, %o2, %o0 | |
105 | ||
106 | __bzero: | |
74cad25c | 107 | clr %g4 |
1da177e4 LT |
108 | mov %g0, %g3 |
109 | 1: | |
110 | cmp %o1, 7 | |
111 | bleu 7f | |
112 | andcc %o0, 3, %o2 | |
113 | ||
114 | bne 3b | |
115 | 4: | |
116 | andcc %o0, 4, %g0 | |
117 | ||
118 | be 2f | |
119 | mov %g3, %g2 | |
120 | ||
121 | EX(st %g3, [%o0], sub %o1, 0) | |
122 | sub %o1, 4, %o1 | |
123 | add %o0, 4, %o0 | |
124 | 2: | |
125 | andcc %o1, 0xffffff80, %o3 ! Now everything is 8 aligned and o1 is len to run | |
126 | be 9f | |
127 | andcc %o1, 0x78, %o2 | |
128 | 10: | |
129 | ZERO_BIG_BLOCK(%o0, 0x00, %g2) | |
130 | subcc %o3, 128, %o3 | |
131 | ZERO_BIG_BLOCK(%o0, 0x40, %g2) | |
1da177e4 LT |
132 | bne 10b |
133 | add %o0, 128, %o0 | |
134 | ||
135 | orcc %o2, %g0, %g0 | |
136 | 9: | |
137 | be 13f | |
138 | andcc %o1, 7, %o1 | |
139 | ||
140 | srl %o2, 1, %o3 | |
141 | set 13f, %o4 | |
142 | sub %o4, %o3, %o4 | |
143 | jmp %o4 | |
144 | add %o0, %o2, %o0 | |
145 | ||
1da177e4 LT |
146 | ZERO_LAST_BLOCKS(%o0, 0x48, %g2) |
147 | ZERO_LAST_BLOCKS(%o0, 0x08, %g2) | |
148 | 13: | |
149 | be 8f | |
150 | andcc %o1, 4, %g0 | |
151 | ||
152 | be 1f | |
153 | andcc %o1, 2, %g0 | |
154 | ||
155 | EX(st %g3, [%o0], and %o1, 7) | |
156 | add %o0, 4, %o0 | |
157 | 1: | |
158 | be 1f | |
159 | andcc %o1, 1, %g0 | |
160 | ||
161 | EX(sth %g3, [%o0], and %o1, 3) | |
162 | add %o0, 2, %o0 | |
163 | 1: | |
164 | bne,a 8f | |
165 | EX(stb %g3, [%o0], and %o1, 1) | |
166 | 8: | |
74cad25c AL |
167 | b 0f |
168 | nop | |
1da177e4 LT |
169 | 7: |
170 | be 13b | |
171 | orcc %o1, 0, %g0 | |
172 | ||
173 | be 0f | |
174 | 8: | |
175 | add %o0, 1, %o0 | |
176 | subcc %o1, 1, %o1 | |
f61698e6 | 177 | bne 8b |
1da177e4 LT |
178 | EX(stb %g3, [%o0 - 1], add %o1, 1) |
179 | 0: | |
74cad25c AL |
180 | andcc %g4, 1, %g0 |
181 | be 5f | |
182 | nop | |
183 | retl | |
184 | mov %g1, %o0 | |
185 | 5: | |
1da177e4 LT |
186 | retl |
187 | clr %o0 | |
1da177e4 LT |
188 | |
189 | .section .fixup,#alloc,#execinstr | |
190 | .align 4 | |
df06c27e AV |
191 | 30: |
192 | and %o1, 0x7f, %o1 | |
e51ea544 | 193 | retl |
df06c27e | 194 | add %o3, %o1, %o0 |
1da177e4 LT |
195 | |
196 | .globl __bzero_end | |
197 | __bzero_end: |