1 /* SPDX-License-Identifier: GPL-2.0 */ 1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* $Id: memset.S,v 1.1 2000/04/14 16:49:01 mjd !! 2 /* linux/arch/sparc/lib/memset.S: Sparc optimized memset, bzero and clear_user code
3 * !! 3 * Copyright (C) 1991,1996 Free Software Foundation
4 * "memset" implementation of SuperH !! 4 * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
5 * !! 5 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
6 * Copyright (C) 1999 Niibe Yutaka <<
7 * 6 *
>> 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.
8 */ 10 */
9 11
10 /* !! 12 #include <asm/ptrace.h>
11 * void *memset(void *s, int c, siz !! 13 #include <asm/export.h>
12 */ <<
13 14
14 #include <linux/linkage.h> !! 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: retl; \
>> 23 a, b, %o0; \
>> 24 .section __ex_table,ALLOC; \
>> 25 .align 4; \
>> 26 .word 98b, 99b; \
>> 27 .text; \
>> 28 .align 4
15 29
16 ENTRY(memset) !! 30 #define STORE(source, base, offset, n) \
17 tst r6,r6 !! 31 98: std source, [base + offset + n]; \
18 bt/s 5f ! if n=0, do n !! 32 .section .fixup,ALLOC,EXECINSTR; \
19 add r6,r4 !! 33 .align 4; \
20 mov #12,r0 !! 34 99: ba 30f; \
21 cmp/gt r6,r0 !! 35 sub %o3, n - offset, %o3; \
22 bt/s 4f ! if it's too !! 36 .section __ex_table,ALLOC; \
23 mov r4,r0 !! 37 .align 4; \
24 and #3,r0 !! 38 .word 98b, 99b; \
25 cmp/eq #0,r0 !! 39 .text; \
26 bt/s 2f ! It's aligned !! 40 .align 4;
27 sub r0,r6 !! 41
28 1: !! 42 #define STORE_LAST(source, base, offset, n) \
29 dt r0 !! 43 EX(std source, [base - offset - n], \
30 bf/s 1b !! 44 add %o1, offset + n);
31 mov.b r5,@-r4 !! 45
32 2: ! make VVVV !! 46 /* Please don't change these macros, unless you change the logic
33 extu.b r5,r5 !! 47 * in the .fixup section below as well.
34 swap.b r5,r0 ! V0 !! 48 * Store 64 bytes at (BASE + OFFSET) using value SOURCE. */
35 or r0,r5 ! VV !! 49 #define ZERO_BIG_BLOCK(base, offset, source) \
36 swap.w r5,r0 ! VV00 !! 50 STORE(source, base, offset, 0x00); \
37 or r0,r5 ! VVVV !! 51 STORE(source, base, offset, 0x08); \
38 ! !! 52 STORE(source, base, offset, 0x10); \
39 mov r6,r0 !! 53 STORE(source, base, offset, 0x18); \
40 shlr2 r0 !! 54 STORE(source, base, offset, 0x20); \
41 shlr r0 ! r0 = r6 >> 3 !! 55 STORE(source, base, offset, 0x28); \
>> 56 STORE(source, base, offset, 0x30); \
>> 57 STORE(source, base, offset, 0x38);
>> 58
>> 59 #define ZERO_LAST_BLOCKS(base, offset, source) \
>> 60 STORE_LAST(source, base, offset, 0x38); \
>> 61 STORE_LAST(source, base, offset, 0x30); \
>> 62 STORE_LAST(source, base, offset, 0x28); \
>> 63 STORE_LAST(source, base, offset, 0x20); \
>> 64 STORE_LAST(source, base, offset, 0x18); \
>> 65 STORE_LAST(source, base, offset, 0x10); \
>> 66 STORE_LAST(source, base, offset, 0x08); \
>> 67 STORE_LAST(source, base, offset, 0x00);
>> 68
>> 69 .text
>> 70 .align 4
>> 71
>> 72 .globl __bzero_begin
>> 73 __bzero_begin:
>> 74
>> 75 .globl __bzero
>> 76 .type __bzero,#function
>> 77 .globl memset
>> 78 EXPORT_SYMBOL(__bzero)
>> 79 EXPORT_SYMBOL(memset)
>> 80 memset:
>> 81 mov %o0, %g1
>> 82 mov 1, %g4
>> 83 and %o1, 0xff, %g3
>> 84 sll %g3, 8, %g2
>> 85 or %g3, %g2, %g3
>> 86 sll %g3, 16, %g2
>> 87 or %g3, %g2, %g3
>> 88 b 1f
>> 89 mov %o2, %o1
42 3: 90 3:
43 dt r0 !! 91 cmp %o2, 3
44 mov.l r5,@-r4 ! set 8-byte a !! 92 be 2f
45 bf/s 3b !! 93 EX(stb %g3, [%o0], sub %o1, 0)
46 mov.l r5,@-r4 !! 94
47 ! !! 95 cmp %o2, 2
48 mov #7,r0 !! 96 be 2f
49 and r0,r6 !! 97 EX(stb %g3, [%o0 + 0x01], sub %o1, 1)
50 tst r6,r6 !! 98
51 bt 5f !! 99 EX(stb %g3, [%o0 + 0x02], sub %o1, 2)
52 ! fill bytes !! 100 2:
>> 101 sub %o2, 4, %o2
>> 102 add %o1, %o2, %o1
>> 103 b 4f
>> 104 sub %o0, %o2, %o0
>> 105
>> 106 __bzero:
>> 107 clr %g4
>> 108 mov %g0, %g3
>> 109 1:
>> 110 cmp %o1, 7
>> 111 bleu 7f
>> 112 andcc %o0, 3, %o2
>> 113
>> 114 bne 3b
53 4: 115 4:
54 dt r6 !! 116 andcc %o0, 4, %g0
55 bf/s 4b !! 117
56 mov.b r5,@-r4 !! 118 be 2f
>> 119 mov %g3, %g2
>> 120
>> 121 EX(st %g3, [%o0], sub %o1, 0)
>> 122 sub %o1, 4, %o1
>> 123 add %o0, 4, %o0
>> 124 2:
>> 125 andcc %o1, 0xffffff80, %o3 ! Now everything is 8 aligned and o1 is len to run
>> 126 be 9f
>> 127 andcc %o1, 0x78, %o2
>> 128 10:
>> 129 ZERO_BIG_BLOCK(%o0, 0x00, %g2)
>> 130 subcc %o3, 128, %o3
>> 131 ZERO_BIG_BLOCK(%o0, 0x40, %g2)
>> 132 bne 10b
>> 133 add %o0, 128, %o0
>> 134
>> 135 orcc %o2, %g0, %g0
>> 136 9:
>> 137 be 13f
>> 138 andcc %o1, 7, %o1
>> 139
>> 140 srl %o2, 1, %o3
>> 141 set 13f, %o4
>> 142 sub %o4, %o3, %o4
>> 143 jmp %o4
>> 144 add %o0, %o2, %o0
>> 145
>> 146 ZERO_LAST_BLOCKS(%o0, 0x48, %g2)
>> 147 ZERO_LAST_BLOCKS(%o0, 0x08, %g2)
>> 148 13:
>> 149 be 8f
>> 150 andcc %o1, 4, %g0
>> 151
>> 152 be 1f
>> 153 andcc %o1, 2, %g0
>> 154
>> 155 EX(st %g3, [%o0], and %o1, 7)
>> 156 add %o0, 4, %o0
>> 157 1:
>> 158 be 1f
>> 159 andcc %o1, 1, %g0
>> 160
>> 161 EX(sth %g3, [%o0], and %o1, 3)
>> 162 add %o0, 2, %o0
>> 163 1:
>> 164 bne,a 8f
>> 165 EX(stb %g3, [%o0], and %o1, 1)
>> 166 8:
>> 167 b 0f
>> 168 nop
>> 169 7:
>> 170 be 13b
>> 171 orcc %o1, 0, %g0
>> 172
>> 173 be 0f
>> 174 8:
>> 175 add %o0, 1, %o0
>> 176 subcc %o1, 1, %o1
>> 177 bne 8b
>> 178 EX(stb %g3, [%o0 - 1], add %o1, 1)
>> 179 0:
>> 180 andcc %g4, 1, %g0
>> 181 be 5f
>> 182 nop
>> 183 retl
>> 184 mov %g1, %o0
57 5: 185 5:
58 rts !! 186 retl
59 mov r4,r0 !! 187 clr %o0
>> 188
>> 189 .section .fixup,#alloc,#execinstr
>> 190 .align 4
>> 191 30:
>> 192 and %o1, 0x7f, %o1
>> 193 retl
>> 194 add %o3, %o1, %o0
>> 195
>> 196 .globl __bzero_end
>> 197 __bzero_end:
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