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77c93b2f G |
1 | /* |
2 | * linux/arch/unicore32/lib/copy_template.S | |
3 | * | |
4 | * Code specific to PKUnity SoC and UniCore ISA | |
5 | * | |
6 | * Copyright (C) 2001-2010 GUAN Xue-tao | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
12 | ||
13 | /* | |
14 | * Theory of operation | |
15 | * ------------------- | |
16 | * | |
17 | * This file provides the core code for a forward memory copy used in | |
18 | * the implementation of memcopy(), copy_to_user() and copy_from_user(). | |
19 | * | |
20 | * The including file must define the following accessor macros | |
21 | * according to the need of the given function: | |
22 | * | |
23 | * ldr1w ptr reg abort | |
24 | * | |
25 | * This loads one word from 'ptr', stores it in 'reg' and increments | |
26 | * 'ptr' to the next word. The 'abort' argument is used for fixup tables. | |
27 | * | |
28 | * ldr4w ptr reg1 reg2 reg3 reg4 abort | |
29 | * ldr8w ptr, reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort | |
30 | * | |
31 | * This loads four or eight words starting from 'ptr', stores them | |
32 | * in provided registers and increments 'ptr' past those words. | |
33 | * The'abort' argument is used for fixup tables. | |
34 | * | |
35 | * ldr1b ptr reg cond abort | |
36 | * | |
37 | * Similar to ldr1w, but it loads a byte and increments 'ptr' one byte. | |
38 | * It also must apply the condition code if provided, otherwise the | |
39 | * "al" condition is assumed by default. | |
40 | * | |
41 | * str1w ptr reg abort | |
42 | * str8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort | |
43 | * str1b ptr reg cond abort | |
44 | * | |
45 | * Same as their ldr* counterparts, but data is stored to 'ptr' location | |
46 | * rather than being loaded. | |
47 | * | |
48 | * enter | |
49 | * | |
50 | * Preserve the provided registers on the stack plus any additional | |
51 | * data as needed by the implementation including this code. Called | |
52 | * upon code entry. | |
53 | * | |
54 | * exit | |
55 | * | |
56 | * Restore registers with the values previously saved with the | |
57 | * 'preserv' macro. Called upon code termination. | |
58 | */ | |
59 | ||
60 | ||
61 | enter | |
62 | ||
63 | sub.a r2, r2, #4 | |
64 | bsl 8f | |
65 | and.a ip, r0, #3 | |
66 | bne 9f | |
67 | and.a ip, r1, #3 | |
68 | bne 10f | |
69 | ||
70 | 1: sub.a r2, r2, #(28) | |
71 | stm.w (r5 - r8), [sp-] | |
72 | bsl 5f | |
73 | ||
74 | 3: | |
75 | 4: ldr8w r1, r3, r4, r5, r6, r7, r8, r10, r11, abort=20f | |
76 | sub.a r2, r2, #32 | |
77 | str8w r0, r3, r4, r5, r6, r7, r8, r10, r11, abort=20f | |
78 | beg 3b | |
79 | ||
80 | 5: and.a ip, r2, #28 | |
81 | rsub ip, ip, #32 | |
82 | beq 7f | |
83 | add pc, pc, ip @ C is always clear here | |
84 | nop | |
85 | ||
86 | ldr1w r1, r3, abort=20f | |
87 | ldr1w r1, r4, abort=20f | |
88 | ldr1w r1, r5, abort=20f | |
89 | ldr1w r1, r6, abort=20f | |
90 | ldr1w r1, r7, abort=20f | |
91 | ldr1w r1, r8, abort=20f | |
92 | ldr1w r1, r11, abort=20f | |
93 | ||
94 | add pc, pc, ip | |
95 | nop | |
96 | ||
97 | str1w r0, r3, abort=20f | |
98 | str1w r0, r4, abort=20f | |
99 | str1w r0, r5, abort=20f | |
100 | str1w r0, r6, abort=20f | |
101 | str1w r0, r7, abort=20f | |
102 | str1w r0, r8, abort=20f | |
103 | str1w r0, r11, abort=20f | |
104 | ||
105 | 7: ldm.w (r5 - r8), [sp]+ | |
106 | ||
107 | 8: mov.a r2, r2 << #31 | |
108 | ldr1b r1, r3, ne, abort=21f | |
109 | ldr1b r1, r4, ea, abort=21f | |
110 | ldr1b r1, r10, ea, abort=21f | |
111 | str1b r0, r3, ne, abort=21f | |
112 | str1b r0, r4, ea, abort=21f | |
113 | str1b r0, r10, ea, abort=21f | |
114 | ||
115 | exit | |
116 | ||
117 | 9: rsub ip, ip, #4 | |
118 | csub.a ip, #2 | |
119 | ldr1b r1, r3, sg, abort=21f | |
120 | ldr1b r1, r4, eg, abort=21f | |
121 | ldr1b r1, r11, abort=21f | |
122 | str1b r0, r3, sg, abort=21f | |
123 | str1b r0, r4, eg, abort=21f | |
124 | sub.a r2, r2, ip | |
125 | str1b r0, r11, abort=21f | |
126 | bsl 8b | |
127 | and.a ip, r1, #3 | |
128 | beq 1b | |
129 | ||
130 | 10: andn r1, r1, #3 | |
131 | csub.a ip, #2 | |
132 | ldr1w r1, r11, abort=21f | |
133 | beq 17f | |
134 | bsg 18f | |
135 | ||
136 | ||
137 | .macro forward_copy_shift a b | |
138 | ||
139 | sub.a r2, r2, #28 | |
140 | bsl 14f | |
141 | ||
142 | 11: stm.w (r5 - r9), [sp-] | |
143 | ||
144 | 12: | |
145 | ldr4w r1, r4, r5, r6, r7, abort=19f | |
146 | mov r3, r11 pull #\a | |
147 | sub.a r2, r2, #32 | |
148 | ldr4w r1, r8, r9, r10, r11, abort=19f | |
149 | or r3, r3, r4 push #\b | |
150 | mov r4, r4 pull #\a | |
151 | or r4, r4, r5 push #\b | |
152 | mov r5, r5 pull #\a | |
153 | or r5, r5, r6 push #\b | |
154 | mov r6, r6 pull #\a | |
155 | or r6, r6, r7 push #\b | |
156 | mov r7, r7 pull #\a | |
157 | or r7, r7, r8 push #\b | |
158 | mov r8, r8 pull #\a | |
159 | or r8, r8, r9 push #\b | |
160 | mov r9, r9 pull #\a | |
161 | or r9, r9, r10 push #\b | |
162 | mov r10, r10 pull #\a | |
163 | or r10, r10, r11 push #\b | |
164 | str8w r0, r3, r4, r5, r6, r7, r8, r9, r10, , abort=19f | |
165 | beg 12b | |
166 | ||
167 | ldm.w (r5 - r9), [sp]+ | |
168 | ||
169 | 14: and.a ip, r2, #28 | |
170 | beq 16f | |
171 | ||
172 | 15: mov r3, r11 pull #\a | |
173 | ldr1w r1, r11, abort=21f | |
174 | sub.a ip, ip, #4 | |
175 | or r3, r3, r11 push #\b | |
176 | str1w r0, r3, abort=21f | |
177 | bsg 15b | |
178 | ||
179 | 16: sub r1, r1, #(\b / 8) | |
180 | b 8b | |
181 | ||
182 | .endm | |
183 | ||
184 | ||
185 | forward_copy_shift a=8 b=24 | |
186 | ||
187 | 17: forward_copy_shift a=16 b=16 | |
188 | ||
189 | 18: forward_copy_shift a=24 b=8 | |
190 | ||
191 | ||
192 | /* | |
193 | * Abort preamble and completion macros. | |
194 | * If a fixup handler is required then those macros must surround it. | |
195 | * It is assumed that the fixup code will handle the private part of | |
196 | * the exit macro. | |
197 | */ | |
198 | ||
199 | .macro copy_abort_preamble | |
200 | 19: ldm.w (r5 - r9), [sp]+ | |
201 | b 21f | |
202 | 299: .word 0 @ store lr | |
203 | @ to avoid function call in fixup | |
204 | 20: ldm.w (r5 - r8), [sp]+ | |
205 | 21: | |
206 | adr r1, 299b | |
207 | stw lr, [r1] | |
208 | .endm | |
209 | ||
210 | .macro copy_abort_end | |
211 | adr lr, 299b | |
212 | ldw pc, [lr] | |
213 | .endm | |
214 |