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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 | ||
30 | #define EXT(start,end,handler) \ | |
31 | .section __ex_table,ALLOC; \ | |
32 | .align 4; \ | |
33 | .word start, 0, end, handler; \ | |
34 | .text; \ | |
35 | .align 4 | |
36 | ||
37 | /* Please don't change these macros, unless you change the logic | |
38 | * in the .fixup section below as well. | |
39 | * Store 64 bytes at (BASE + OFFSET) using value SOURCE. */ | |
40 | #define ZERO_BIG_BLOCK(base, offset, source) \ | |
41 | std source, [base + offset + 0x00]; \ | |
42 | std source, [base + offset + 0x08]; \ | |
43 | std source, [base + offset + 0x10]; \ | |
44 | std source, [base + offset + 0x18]; \ | |
45 | std source, [base + offset + 0x20]; \ | |
46 | std source, [base + offset + 0x28]; \ | |
47 | std source, [base + offset + 0x30]; \ | |
48 | std source, [base + offset + 0x38]; | |
49 | ||
50 | #define ZERO_LAST_BLOCKS(base, offset, source) \ | |
51 | std source, [base - offset - 0x38]; \ | |
52 | std source, [base - offset - 0x30]; \ | |
53 | std source, [base - offset - 0x28]; \ | |
54 | std source, [base - offset - 0x20]; \ | |
55 | std source, [base - offset - 0x18]; \ | |
56 | std source, [base - offset - 0x10]; \ | |
57 | std source, [base - offset - 0x08]; \ | |
58 | std source, [base - offset - 0x00]; | |
59 | ||
60 | .text | |
61 | .align 4 | |
62 | ||
63 | .globl __bzero_begin | |
64 | __bzero_begin: | |
65 | ||
4d14a459 | 66 | .globl __bzero |
f5a651f1 | 67 | .type __bzero,#function |
1da177e4 | 68 | .globl memset |
d3867f04 AV |
69 | EXPORT_SYMBOL(__bzero) |
70 | EXPORT_SYMBOL(memset) | |
1da177e4 | 71 | memset: |
74cad25c AL |
72 | mov %o0, %g1 |
73 | mov 1, %g4 | |
1da177e4 LT |
74 | and %o1, 0xff, %g3 |
75 | sll %g3, 8, %g2 | |
76 | or %g3, %g2, %g3 | |
77 | sll %g3, 16, %g2 | |
78 | or %g3, %g2, %g3 | |
79 | b 1f | |
80 | mov %o2, %o1 | |
81 | 3: | |
82 | cmp %o2, 3 | |
83 | be 2f | |
84 | EX(stb %g3, [%o0], sub %o1, 0) | |
85 | ||
86 | cmp %o2, 2 | |
87 | be 2f | |
88 | EX(stb %g3, [%o0 + 0x01], sub %o1, 1) | |
89 | ||
90 | EX(stb %g3, [%o0 + 0x02], sub %o1, 2) | |
91 | 2: | |
92 | sub %o2, 4, %o2 | |
93 | add %o1, %o2, %o1 | |
94 | b 4f | |
95 | sub %o0, %o2, %o0 | |
96 | ||
97 | __bzero: | |
74cad25c | 98 | clr %g4 |
1da177e4 LT |
99 | mov %g0, %g3 |
100 | 1: | |
101 | cmp %o1, 7 | |
102 | bleu 7f | |
103 | andcc %o0, 3, %o2 | |
104 | ||
105 | bne 3b | |
106 | 4: | |
107 | andcc %o0, 4, %g0 | |
108 | ||
109 | be 2f | |
110 | mov %g3, %g2 | |
111 | ||
112 | EX(st %g3, [%o0], sub %o1, 0) | |
113 | sub %o1, 4, %o1 | |
114 | add %o0, 4, %o0 | |
115 | 2: | |
116 | andcc %o1, 0xffffff80, %o3 ! Now everything is 8 aligned and o1 is len to run | |
117 | be 9f | |
118 | andcc %o1, 0x78, %o2 | |
119 | 10: | |
120 | ZERO_BIG_BLOCK(%o0, 0x00, %g2) | |
121 | subcc %o3, 128, %o3 | |
122 | ZERO_BIG_BLOCK(%o0, 0x40, %g2) | |
123 | 11: | |
124 | EXT(10b, 11b, 20f) | |
125 | bne 10b | |
126 | add %o0, 128, %o0 | |
127 | ||
128 | orcc %o2, %g0, %g0 | |
129 | 9: | |
130 | be 13f | |
131 | andcc %o1, 7, %o1 | |
132 | ||
133 | srl %o2, 1, %o3 | |
134 | set 13f, %o4 | |
135 | sub %o4, %o3, %o4 | |
136 | jmp %o4 | |
137 | add %o0, %o2, %o0 | |
138 | ||
139 | 12: | |
140 | ZERO_LAST_BLOCKS(%o0, 0x48, %g2) | |
141 | ZERO_LAST_BLOCKS(%o0, 0x08, %g2) | |
142 | 13: | |
143 | be 8f | |
144 | andcc %o1, 4, %g0 | |
145 | ||
146 | be 1f | |
147 | andcc %o1, 2, %g0 | |
148 | ||
149 | EX(st %g3, [%o0], and %o1, 7) | |
150 | add %o0, 4, %o0 | |
151 | 1: | |
152 | be 1f | |
153 | andcc %o1, 1, %g0 | |
154 | ||
155 | EX(sth %g3, [%o0], and %o1, 3) | |
156 | add %o0, 2, %o0 | |
157 | 1: | |
158 | bne,a 8f | |
159 | EX(stb %g3, [%o0], and %o1, 1) | |
160 | 8: | |
74cad25c AL |
161 | b 0f |
162 | nop | |
1da177e4 LT |
163 | 7: |
164 | be 13b | |
165 | orcc %o1, 0, %g0 | |
166 | ||
167 | be 0f | |
168 | 8: | |
169 | add %o0, 1, %o0 | |
170 | subcc %o1, 1, %o1 | |
f61698e6 | 171 | bne 8b |
1da177e4 LT |
172 | EX(stb %g3, [%o0 - 1], add %o1, 1) |
173 | 0: | |
74cad25c AL |
174 | andcc %g4, 1, %g0 |
175 | be 5f | |
176 | nop | |
177 | retl | |
178 | mov %g1, %o0 | |
179 | 5: | |
1da177e4 LT |
180 | retl |
181 | clr %o0 | |
1da177e4 LT |
182 | |
183 | .section .fixup,#alloc,#execinstr | |
184 | .align 4 | |
185 | 20: | |
186 | cmp %g2, 8 | |
187 | bleu 1f | |
188 | and %o1, 0x7f, %o1 | |
189 | sub %g2, 9, %g2 | |
190 | add %o3, 64, %o3 | |
191 | 1: | |
192 | sll %g2, 3, %g2 | |
193 | add %o3, %o1, %o0 | |
e51ea544 | 194 | retl |
1da177e4 LT |
195 | sub %o0, %g2, %o0 |
196 | 21: | |
197 | mov 8, %o0 | |
198 | and %o1, 7, %o1 | |
199 | sub %o0, %g2, %o0 | |
200 | sll %o0, 3, %o0 | |
e51ea544 | 201 | retl |
1da177e4 | 202 | add %o0, %o1, %o0 |
1da177e4 LT |
203 | |
204 | .globl __bzero_end | |
205 | __bzero_end: |