| 1 | /*
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| 2 | * Copyright (C) 2009 Michal Simek <monstr@monstr.eu>
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| 3 | * Copyright (C) 2009 PetaLogix
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| 4 | * Copyright (C) 2007 LynuxWorks, Inc.
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| 5 | *
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| 6 | * This file is subject to the terms and conditions of the GNU General Public
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| 7 | * License. See the file "COPYING" in the main directory of this archive
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| 8 | * for more details.
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| 9 | */
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| 10 |
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| 11 | |
| 12 | |
| 13 | |
| 14 |
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| 15 | /* Loop unrolling for __copy_tofrom_user */
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| 16 | |
| 17 | 1: lwi r4 , r6, 0x0000 + offset; \
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| 18 | 2: lwi r19, r6, 0x0004 + offset; \
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| 19 | 3: lwi r20, r6, 0x0008 + offset; \
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| 20 | 4: lwi r21, r6, 0x000C + offset; \
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| 21 | 5: lwi r22, r6, 0x0010 + offset; \
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| 22 | 6: lwi r23, r6, 0x0014 + offset; \
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| 23 | 7: lwi r24, r6, 0x0018 + offset; \
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| 24 | 8: lwi r25, r6, 0x001C + offset; \
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| 25 | 9: swi r4 , r5, 0x0000 + offset; \
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| 26 | 10: swi r19, r5, 0x0004 + offset; \
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| 27 | 11: swi r20, r5, 0x0008 + offset; \
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| 28 | 12: swi r21, r5, 0x000C + offset; \
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| 29 | 13: swi r22, r5, 0x0010 + offset; \
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| 30 | 14: swi r23, r5, 0x0014 + offset; \
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| 31 | 15: swi r24, r5, 0x0018 + offset; \
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| 32 | 16: swi r25, r5, 0x001C + offset; \
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| 33 | .section __ex_table,"a"; \
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| 34 | .word 1b, 33f; \
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| 35 | .word 2b, 33f; \
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| 36 | .word 3b, 33f; \
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| 37 | .word 4b, 33f; \
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| 38 | .word 5b, 33f; \
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| 39 | .word 6b, 33f; \
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| 40 | .word 7b, 33f; \
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| 41 | .word 8b, 33f; \
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| 42 | .word 9b, 33f; \
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| 43 | .word 10b, 33f; \
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| 44 | .word 11b, 33f; \
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| 45 | .word 12b, 33f; \
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| 46 | .word 13b, 33f; \
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| 47 | .word 14b, 33f; \
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| 48 | .word 15b, 33f; \
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| 49 | .word 16b, 33f; \
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| 50 | .text
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| 51 |
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| 52 | |
| 53 | COPY(0x00 + offset);\
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| 54 | COPY(0x20 + offset);\
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| 55 | COPY(0x40 + offset);\
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| 56 | COPY(0x60 + offset);
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| 57 |
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| 58 | /*
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| 59 | * int __copy_tofrom_user(char *to, char *from, int len)
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| 60 | * Return:
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| 61 | * 0 on success
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| 62 | * number of not copied bytes on error
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| 63 | */
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| 64 | .text
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| 65 | .globl __copy_tofrom_user;
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| 66 | .type __copy_tofrom_user, @function
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| 67 | .align 4;
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| 68 | __copy_tofrom_user:
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| 69 | /*
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| 70 | * r5 - to
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| 71 | * r6 - from
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| 72 | * r7, r3 - count
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| 73 | * r4 - tempval
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| 74 | */
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| 75 | beqid r7, 0f /* zero size is not likely */
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| 76 | or r3, r5, r6 /* find if is any to/from unaligned */
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| 77 | or r3, r3, r7 /* find if count is unaligned */
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| 78 | andi r3, r3, 0x3 /* mask last 3 bits */
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| 79 | bneid r3, bu1 /* if r3 is not zero then byte copying */
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| 80 | or r3, r0, r0
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| 81 |
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| 82 | rsubi r3, r7, PAGE_SIZE /* detect PAGE_SIZE */
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| 83 | beqid r3, page;
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| 84 | or r3, r0, r0
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| 85 |
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| 86 | w1: lw r4, r6, r3 /* at least one 4 byte copy */
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| 87 | w2: sw r4, r5, r3
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| 88 | addik r7, r7, -4
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| 89 | bneid r7, w1
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| 90 | addik r3, r3, 4
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| 91 | addik r3, r7, 0
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| 92 | rtsd r15, 8
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| 93 | nop
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| 94 |
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| 95 | .section __ex_table,"a"
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| 96 | .word w1, 0f;
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| 97 | .word w2, 0f;
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| 98 | .text
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| 99 |
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| 100 | .align 4 /* Alignment is important to keep icache happy */
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| 101 | page: /* Create room on stack and save registers for storing values */
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| 102 | addik r1, r1, -40
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| 103 | swi r5, r1, 0
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| 104 | swi r6, r1, 4
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| 105 | swi r7, r1, 8
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| 106 | swi r19, r1, 12
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| 107 | swi r20, r1, 16
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| 108 | swi r21, r1, 20
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| 109 | swi r22, r1, 24
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| 110 | swi r23, r1, 28
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| 111 | swi r24, r1, 32
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| 112 | swi r25, r1, 36
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| 113 | loop: /* r4, r19, r20, r21, r22, r23, r24, r25 are used for storing values */
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| 114 | /* Loop unrolling to get performance boost */
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| 115 | COPY_80(0x000);
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| 116 | COPY_80(0x080);
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| 117 | COPY_80(0x100);
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| 118 | COPY_80(0x180);
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| 119 | /* copy loop */
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| 120 | addik r6, r6, 0x200
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| 121 | addik r7, r7, -0x200
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| 122 | bneid r7, loop
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| 123 | addik r5, r5, 0x200
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| 124 |
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| 125 | /* Restore register content */
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| 126 | lwi r5, r1, 0
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| 127 | lwi r6, r1, 4
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| 128 | lwi r7, r1, 8
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| 129 | lwi r19, r1, 12
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| 130 | lwi r20, r1, 16
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| 131 | lwi r21, r1, 20
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| 132 | lwi r22, r1, 24
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| 133 | lwi r23, r1, 28
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| 134 | lwi r24, r1, 32
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| 135 | lwi r25, r1, 36
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| 136 | addik r1, r1, 40
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| 137 | /* return back */
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| 138 | addik r3, r0, 0
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| 139 | rtsd r15, 8
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| 140 | nop
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| 141 |
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| 142 | /* Fault case - return temp count */
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| 143 | 33:
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| 144 | addik r3, r7, 0
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| 145 | /* Restore register content */
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| 146 | lwi r5, r1, 0
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| 147 | lwi r6, r1, 4
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| 148 | lwi r7, r1, 8
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| 149 | lwi r19, r1, 12
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| 150 | lwi r20, r1, 16
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| 151 | lwi r21, r1, 20
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| 152 | lwi r22, r1, 24
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| 153 | lwi r23, r1, 28
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| 154 | lwi r24, r1, 32
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| 155 | lwi r25, r1, 36
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| 156 | addik r1, r1, 40
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| 157 | /* return back */
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| 158 | rtsd r15, 8
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| 159 | nop
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| 160 |
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| 161 | .align 4 /* Alignment is important to keep icache happy */
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| 162 | bu1: lbu r4,r6,r3
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| 163 | bu2: sb r4,r5,r3
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| 164 | addik r7,r7,-1
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| 165 | bneid r7,bu1
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| 166 | addik r3,r3,1 /* delay slot */
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| 167 | 0:
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| 168 | addik r3,r7,0
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| 169 | rtsd r15,8
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| 170 | nop
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| 171 | .size __copy_tofrom_user, . - __copy_tofrom_user
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| 172 |
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| 173 | .section __ex_table,"a"
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| 174 | .word bu1, 0b;
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| 175 | .word bu2, 0b;
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| 176 | .text
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