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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; \ | |
22 | 99: ba 30f; \ | |
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 LT |
71 | .globl __memset_start, __memset_end |
72 | __memset_start: | |
1da177e4 | 73 | memset: |
74cad25c AL |
74 | mov %o0, %g1 |
75 | mov 1, %g4 | |
1da177e4 LT |
76 | and %o1, 0xff, %g3 |
77 | sll %g3, 8, %g2 | |
78 | or %g3, %g2, %g3 | |
79 | sll %g3, 16, %g2 | |
80 | or %g3, %g2, %g3 | |
81 | b 1f | |
82 | mov %o2, %o1 | |
83 | 3: | |
84 | cmp %o2, 3 | |
85 | be 2f | |
86 | EX(stb %g3, [%o0], sub %o1, 0) | |
87 | ||
88 | cmp %o2, 2 | |
89 | be 2f | |
90 | EX(stb %g3, [%o0 + 0x01], sub %o1, 1) | |
91 | ||
92 | EX(stb %g3, [%o0 + 0x02], sub %o1, 2) | |
93 | 2: | |
94 | sub %o2, 4, %o2 | |
95 | add %o1, %o2, %o1 | |
96 | b 4f | |
97 | sub %o0, %o2, %o0 | |
98 | ||
99 | __bzero: | |
74cad25c | 100 | clr %g4 |
1da177e4 LT |
101 | mov %g0, %g3 |
102 | 1: | |
103 | cmp %o1, 7 | |
104 | bleu 7f | |
105 | andcc %o0, 3, %o2 | |
106 | ||
107 | bne 3b | |
108 | 4: | |
109 | andcc %o0, 4, %g0 | |
110 | ||
111 | be 2f | |
112 | mov %g3, %g2 | |
113 | ||
114 | EX(st %g3, [%o0], sub %o1, 0) | |
115 | sub %o1, 4, %o1 | |
116 | add %o0, 4, %o0 | |
117 | 2: | |
118 | andcc %o1, 0xffffff80, %o3 ! Now everything is 8 aligned and o1 is len to run | |
119 | be 9f | |
120 | andcc %o1, 0x78, %o2 | |
121 | 10: | |
122 | ZERO_BIG_BLOCK(%o0, 0x00, %g2) | |
123 | subcc %o3, 128, %o3 | |
124 | ZERO_BIG_BLOCK(%o0, 0x40, %g2) | |
125 | 11: | |
126 | EXT(10b, 11b, 20f) | |
127 | bne 10b | |
128 | add %o0, 128, %o0 | |
129 | ||
130 | orcc %o2, %g0, %g0 | |
131 | 9: | |
132 | be 13f | |
133 | andcc %o1, 7, %o1 | |
134 | ||
135 | srl %o2, 1, %o3 | |
136 | set 13f, %o4 | |
137 | sub %o4, %o3, %o4 | |
138 | jmp %o4 | |
139 | add %o0, %o2, %o0 | |
140 | ||
141 | 12: | |
142 | ZERO_LAST_BLOCKS(%o0, 0x48, %g2) | |
143 | ZERO_LAST_BLOCKS(%o0, 0x08, %g2) | |
144 | 13: | |
145 | be 8f | |
146 | andcc %o1, 4, %g0 | |
147 | ||
148 | be 1f | |
149 | andcc %o1, 2, %g0 | |
150 | ||
151 | EX(st %g3, [%o0], and %o1, 7) | |
152 | add %o0, 4, %o0 | |
153 | 1: | |
154 | be 1f | |
155 | andcc %o1, 1, %g0 | |
156 | ||
157 | EX(sth %g3, [%o0], and %o1, 3) | |
158 | add %o0, 2, %o0 | |
159 | 1: | |
160 | bne,a 8f | |
161 | EX(stb %g3, [%o0], and %o1, 1) | |
162 | 8: | |
74cad25c AL |
163 | b 0f |
164 | nop | |
1da177e4 LT |
165 | 7: |
166 | be 13b | |
167 | orcc %o1, 0, %g0 | |
168 | ||
169 | be 0f | |
170 | 8: | |
171 | add %o0, 1, %o0 | |
172 | subcc %o1, 1, %o1 | |
f61698e6 | 173 | bne 8b |
1da177e4 LT |
174 | EX(stb %g3, [%o0 - 1], add %o1, 1) |
175 | 0: | |
74cad25c AL |
176 | andcc %g4, 1, %g0 |
177 | be 5f | |
178 | nop | |
179 | retl | |
180 | mov %g1, %o0 | |
181 | 5: | |
1da177e4 LT |
182 | retl |
183 | clr %o0 | |
184 | __memset_end: | |
185 | ||
186 | .section .fixup,#alloc,#execinstr | |
187 | .align 4 | |
188 | 20: | |
189 | cmp %g2, 8 | |
190 | bleu 1f | |
191 | and %o1, 0x7f, %o1 | |
192 | sub %g2, 9, %g2 | |
193 | add %o3, 64, %o3 | |
194 | 1: | |
195 | sll %g2, 3, %g2 | |
196 | add %o3, %o1, %o0 | |
197 | b 30f | |
198 | sub %o0, %g2, %o0 | |
199 | 21: | |
200 | mov 8, %o0 | |
201 | and %o1, 7, %o1 | |
202 | sub %o0, %g2, %o0 | |
203 | sll %o0, 3, %o0 | |
204 | b 30f | |
205 | add %o0, %o1, %o0 | |
206 | 30: | |
207 | /* %o4 is faulting address, %o5 is %pc where fault occurred */ | |
208 | save %sp, -104, %sp | |
209 | mov %i5, %o0 | |
210 | mov %i7, %o1 | |
211 | call lookup_fault | |
212 | mov %i4, %o2 | |
213 | ret | |
214 | restore | |
215 | ||
216 | .globl __bzero_end | |
217 | __bzero_end: |