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1da177e4 LT |
1 | /* linux/arch/sparc/lib/memset.S: Sparc optimized memset, bzero and clear_user code |
2 | * Copyright (C) 1991,1996 Free Software Foundation | |
3 | * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz) | |
4 | * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu) | |
5 | * | |
6 | * Returns 0, if ok, and number of bytes not yet set if exception | |
7 | * occurs and we were called as clear_user. | |
8 | */ | |
9 | ||
10 | #include <asm/ptrace.h> | |
11 | ||
12 | /* Work around cpp -rob */ | |
13 | #define ALLOC #alloc | |
14 | #define EXECINSTR #execinstr | |
15 | #define EX(x,y,a,b) \ | |
16 | 98: x,y; \ | |
17 | .section .fixup,ALLOC,EXECINSTR; \ | |
18 | .align 4; \ | |
19 | 99: ba 30f; \ | |
20 | a, b, %o0; \ | |
21 | .section __ex_table,ALLOC; \ | |
22 | .align 4; \ | |
23 | .word 98b, 99b; \ | |
24 | .text; \ | |
25 | .align 4 | |
26 | ||
27 | #define EXT(start,end,handler) \ | |
28 | .section __ex_table,ALLOC; \ | |
29 | .align 4; \ | |
30 | .word start, 0, end, handler; \ | |
31 | .text; \ | |
32 | .align 4 | |
33 | ||
34 | /* Please don't change these macros, unless you change the logic | |
35 | * in the .fixup section below as well. | |
36 | * Store 64 bytes at (BASE + OFFSET) using value SOURCE. */ | |
37 | #define ZERO_BIG_BLOCK(base, offset, source) \ | |
38 | std source, [base + offset + 0x00]; \ | |
39 | std source, [base + offset + 0x08]; \ | |
40 | std source, [base + offset + 0x10]; \ | |
41 | std source, [base + offset + 0x18]; \ | |
42 | std source, [base + offset + 0x20]; \ | |
43 | std source, [base + offset + 0x28]; \ | |
44 | std source, [base + offset + 0x30]; \ | |
45 | std source, [base + offset + 0x38]; | |
46 | ||
47 | #define ZERO_LAST_BLOCKS(base, offset, source) \ | |
48 | std source, [base - offset - 0x38]; \ | |
49 | std source, [base - offset - 0x30]; \ | |
50 | std source, [base - offset - 0x28]; \ | |
51 | std source, [base - offset - 0x20]; \ | |
52 | std source, [base - offset - 0x18]; \ | |
53 | std source, [base - offset - 0x10]; \ | |
54 | std source, [base - offset - 0x08]; \ | |
55 | std source, [base - offset - 0x00]; | |
56 | ||
57 | .text | |
58 | .align 4 | |
59 | ||
60 | .globl __bzero_begin | |
61 | __bzero_begin: | |
62 | ||
63 | .globl __bzero, __memset, | |
64 | .globl memset | |
65 | .globl __memset_start, __memset_end | |
66 | __memset_start: | |
67 | __memset: | |
68 | memset: | |
69 | and %o1, 0xff, %g3 | |
70 | sll %g3, 8, %g2 | |
71 | or %g3, %g2, %g3 | |
72 | sll %g3, 16, %g2 | |
73 | or %g3, %g2, %g3 | |
74 | b 1f | |
75 | mov %o2, %o1 | |
76 | 3: | |
77 | cmp %o2, 3 | |
78 | be 2f | |
79 | EX(stb %g3, [%o0], sub %o1, 0) | |
80 | ||
81 | cmp %o2, 2 | |
82 | be 2f | |
83 | EX(stb %g3, [%o0 + 0x01], sub %o1, 1) | |
84 | ||
85 | EX(stb %g3, [%o0 + 0x02], sub %o1, 2) | |
86 | 2: | |
87 | sub %o2, 4, %o2 | |
88 | add %o1, %o2, %o1 | |
89 | b 4f | |
90 | sub %o0, %o2, %o0 | |
91 | ||
92 | __bzero: | |
93 | mov %g0, %g3 | |
94 | 1: | |
95 | cmp %o1, 7 | |
96 | bleu 7f | |
97 | andcc %o0, 3, %o2 | |
98 | ||
99 | bne 3b | |
100 | 4: | |
101 | andcc %o0, 4, %g0 | |
102 | ||
103 | be 2f | |
104 | mov %g3, %g2 | |
105 | ||
106 | EX(st %g3, [%o0], sub %o1, 0) | |
107 | sub %o1, 4, %o1 | |
108 | add %o0, 4, %o0 | |
109 | 2: | |
110 | andcc %o1, 0xffffff80, %o3 ! Now everything is 8 aligned and o1 is len to run | |
111 | be 9f | |
112 | andcc %o1, 0x78, %o2 | |
113 | 10: | |
114 | ZERO_BIG_BLOCK(%o0, 0x00, %g2) | |
115 | subcc %o3, 128, %o3 | |
116 | ZERO_BIG_BLOCK(%o0, 0x40, %g2) | |
117 | 11: | |
118 | EXT(10b, 11b, 20f) | |
119 | bne 10b | |
120 | add %o0, 128, %o0 | |
121 | ||
122 | orcc %o2, %g0, %g0 | |
123 | 9: | |
124 | be 13f | |
125 | andcc %o1, 7, %o1 | |
126 | ||
127 | srl %o2, 1, %o3 | |
128 | set 13f, %o4 | |
129 | sub %o4, %o3, %o4 | |
130 | jmp %o4 | |
131 | add %o0, %o2, %o0 | |
132 | ||
133 | 12: | |
134 | ZERO_LAST_BLOCKS(%o0, 0x48, %g2) | |
135 | ZERO_LAST_BLOCKS(%o0, 0x08, %g2) | |
136 | 13: | |
137 | be 8f | |
138 | andcc %o1, 4, %g0 | |
139 | ||
140 | be 1f | |
141 | andcc %o1, 2, %g0 | |
142 | ||
143 | EX(st %g3, [%o0], and %o1, 7) | |
144 | add %o0, 4, %o0 | |
145 | 1: | |
146 | be 1f | |
147 | andcc %o1, 1, %g0 | |
148 | ||
149 | EX(sth %g3, [%o0], and %o1, 3) | |
150 | add %o0, 2, %o0 | |
151 | 1: | |
152 | bne,a 8f | |
153 | EX(stb %g3, [%o0], and %o1, 1) | |
154 | 8: | |
155 | retl | |
156 | clr %o0 | |
157 | 7: | |
158 | be 13b | |
159 | orcc %o1, 0, %g0 | |
160 | ||
161 | be 0f | |
162 | 8: | |
163 | add %o0, 1, %o0 | |
164 | subcc %o1, 1, %o1 | |
165 | bne,a 8b | |
166 | EX(stb %g3, [%o0 - 1], add %o1, 1) | |
167 | 0: | |
168 | retl | |
169 | clr %o0 | |
170 | __memset_end: | |
171 | ||
172 | .section .fixup,#alloc,#execinstr | |
173 | .align 4 | |
174 | 20: | |
175 | cmp %g2, 8 | |
176 | bleu 1f | |
177 | and %o1, 0x7f, %o1 | |
178 | sub %g2, 9, %g2 | |
179 | add %o3, 64, %o3 | |
180 | 1: | |
181 | sll %g2, 3, %g2 | |
182 | add %o3, %o1, %o0 | |
183 | b 30f | |
184 | sub %o0, %g2, %o0 | |
185 | 21: | |
186 | mov 8, %o0 | |
187 | and %o1, 7, %o1 | |
188 | sub %o0, %g2, %o0 | |
189 | sll %o0, 3, %o0 | |
190 | b 30f | |
191 | add %o0, %o1, %o0 | |
192 | 30: | |
193 | /* %o4 is faulting address, %o5 is %pc where fault occurred */ | |
194 | save %sp, -104, %sp | |
195 | mov %i5, %o0 | |
196 | mov %i7, %o1 | |
197 | call lookup_fault | |
198 | mov %i4, %o2 | |
199 | ret | |
200 | restore | |
201 | ||
202 | .globl __bzero_end | |
203 | __bzero_end: |