1 /* SPDX-License-Identifier: GPL-2.0 */ !! 1 /* linux/arch/sparc/lib/memset.S: Sparc optimized memset, bzero and clear_user code
2 /* $Id: memset.S,v 1.1 2000/04/14 16:49:01 mjd !! 2 * Copyright (C) 1991,1996 Free Software Foundation
3 * !! 3 * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
4 * "memset" implementation of SuperH !! 4 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
5 * <<
6 * Copyright (C) 1999 Niibe Yutaka <<
7 * 5 *
>> 6 * Calls to memset returns initial %o0. Calls to bzero returns 0, if ok, and
>> 7 * number of bytes not yet set if exception occurs and we were called as
>> 8 * clear_user.
8 */ 9 */
9 10
10 /* !! 11 #include <asm/ptrace.h>
11 * void *memset(void *s, int c, siz !! 12 #include <asm/export.h>
12 */ <<
13 13
14 #include <linux/linkage.h> !! 14 /* Work around cpp -rob */
>> 15 #define ALLOC #alloc
>> 16 #define EXECINSTR #execinstr
>> 17 #define EX(x,y,a,b) \
>> 18 98: x,y; \
>> 19 .section .fixup,ALLOC,EXECINSTR; \
>> 20 .align 4; \
>> 21 99: ba 30f; \
>> 22 a, b, %o0; \
>> 23 .section __ex_table,ALLOC; \
>> 24 .align 4; \
>> 25 .word 98b, 99b; \
>> 26 .text; \
>> 27 .align 4
15 28
16 ENTRY(memset) !! 29 #define EXT(start,end,handler) \
17 tst r6,r6 !! 30 .section __ex_table,ALLOC; \
18 bt/s 5f ! if n=0, do n !! 31 .align 4; \
19 add r6,r4 !! 32 .word start, 0, end, handler; \
20 mov #12,r0 !! 33 .text; \
21 cmp/gt r6,r0 !! 34 .align 4
22 bt/s 4f ! if it's too !! 35
23 mov r4,r0 !! 36 /* Please don't change these macros, unless you change the logic
24 and #3,r0 !! 37 * in the .fixup section below as well.
25 cmp/eq #0,r0 !! 38 * Store 64 bytes at (BASE + OFFSET) using value SOURCE. */
26 bt/s 2f ! It's aligned !! 39 #define ZERO_BIG_BLOCK(base, offset, source) \
27 sub r0,r6 !! 40 std source, [base + offset + 0x00]; \
28 1: !! 41 std source, [base + offset + 0x08]; \
29 dt r0 !! 42 std source, [base + offset + 0x10]; \
30 bf/s 1b !! 43 std source, [base + offset + 0x18]; \
31 mov.b r5,@-r4 !! 44 std source, [base + offset + 0x20]; \
32 2: ! make VVVV !! 45 std source, [base + offset + 0x28]; \
33 extu.b r5,r5 !! 46 std source, [base + offset + 0x30]; \
34 swap.b r5,r0 ! V0 !! 47 std source, [base + offset + 0x38];
35 or r0,r5 ! VV !! 48
36 swap.w r5,r0 ! VV00 !! 49 #define ZERO_LAST_BLOCKS(base, offset, source) \
37 or r0,r5 ! VVVV !! 50 std source, [base - offset - 0x38]; \
38 ! !! 51 std source, [base - offset - 0x30]; \
39 mov r6,r0 !! 52 std source, [base - offset - 0x28]; \
40 shlr2 r0 !! 53 std source, [base - offset - 0x20]; \
41 shlr r0 ! r0 = r6 >> 3 !! 54 std source, [base - offset - 0x18]; \
>> 55 std source, [base - offset - 0x10]; \
>> 56 std source, [base - offset - 0x08]; \
>> 57 std source, [base - offset - 0x00];
>> 58
>> 59 .text
>> 60 .align 4
>> 61
>> 62 .globl __bzero_begin
>> 63 __bzero_begin:
>> 64
>> 65 .globl __bzero
>> 66 .type __bzero,#function
>> 67 .globl memset
>> 68 EXPORT_SYMBOL(__bzero)
>> 69 EXPORT_SYMBOL(memset)
>> 70 .globl __memset_start, __memset_end
>> 71 __memset_start:
>> 72 memset:
>> 73 mov %o0, %g1
>> 74 mov 1, %g4
>> 75 and %o1, 0xff, %g3
>> 76 sll %g3, 8, %g2
>> 77 or %g3, %g2, %g3
>> 78 sll %g3, 16, %g2
>> 79 or %g3, %g2, %g3
>> 80 b 1f
>> 81 mov %o2, %o1
42 3: 82 3:
43 dt r0 !! 83 cmp %o2, 3
44 mov.l r5,@-r4 ! set 8-byte a !! 84 be 2f
45 bf/s 3b !! 85 EX(stb %g3, [%o0], sub %o1, 0)
46 mov.l r5,@-r4 !! 86
47 ! !! 87 cmp %o2, 2
48 mov #7,r0 !! 88 be 2f
49 and r0,r6 !! 89 EX(stb %g3, [%o0 + 0x01], sub %o1, 1)
50 tst r6,r6 !! 90
51 bt 5f !! 91 EX(stb %g3, [%o0 + 0x02], sub %o1, 2)
52 ! fill bytes !! 92 2:
>> 93 sub %o2, 4, %o2
>> 94 add %o1, %o2, %o1
>> 95 b 4f
>> 96 sub %o0, %o2, %o0
>> 97
>> 98 __bzero:
>> 99 clr %g4
>> 100 mov %g0, %g3
>> 101 1:
>> 102 cmp %o1, 7
>> 103 bleu 7f
>> 104 andcc %o0, 3, %o2
>> 105
>> 106 bne 3b
53 4: 107 4:
54 dt r6 !! 108 andcc %o0, 4, %g0
55 bf/s 4b !! 109
56 mov.b r5,@-r4 !! 110 be 2f
>> 111 mov %g3, %g2
>> 112
>> 113 EX(st %g3, [%o0], sub %o1, 0)
>> 114 sub %o1, 4, %o1
>> 115 add %o0, 4, %o0
>> 116 2:
>> 117 andcc %o1, 0xffffff80, %o3 ! Now everything is 8 aligned and o1 is len to run
>> 118 be 9f
>> 119 andcc %o1, 0x78, %o2
>> 120 10:
>> 121 ZERO_BIG_BLOCK(%o0, 0x00, %g2)
>> 122 subcc %o3, 128, %o3
>> 123 ZERO_BIG_BLOCK(%o0, 0x40, %g2)
>> 124 11:
>> 125 EXT(10b, 11b, 20f)
>> 126 bne 10b
>> 127 add %o0, 128, %o0
>> 128
>> 129 orcc %o2, %g0, %g0
>> 130 9:
>> 131 be 13f
>> 132 andcc %o1, 7, %o1
>> 133
>> 134 srl %o2, 1, %o3
>> 135 set 13f, %o4
>> 136 sub %o4, %o3, %o4
>> 137 jmp %o4
>> 138 add %o0, %o2, %o0
>> 139
>> 140 12:
>> 141 ZERO_LAST_BLOCKS(%o0, 0x48, %g2)
>> 142 ZERO_LAST_BLOCKS(%o0, 0x08, %g2)
>> 143 13:
>> 144 be 8f
>> 145 andcc %o1, 4, %g0
>> 146
>> 147 be 1f
>> 148 andcc %o1, 2, %g0
>> 149
>> 150 EX(st %g3, [%o0], and %o1, 7)
>> 151 add %o0, 4, %o0
>> 152 1:
>> 153 be 1f
>> 154 andcc %o1, 1, %g0
>> 155
>> 156 EX(sth %g3, [%o0], and %o1, 3)
>> 157 add %o0, 2, %o0
>> 158 1:
>> 159 bne,a 8f
>> 160 EX(stb %g3, [%o0], and %o1, 1)
>> 161 8:
>> 162 b 0f
>> 163 nop
>> 164 7:
>> 165 be 13b
>> 166 orcc %o1, 0, %g0
>> 167
>> 168 be 0f
>> 169 8:
>> 170 add %o0, 1, %o0
>> 171 subcc %o1, 1, %o1
>> 172 bne 8b
>> 173 EX(stb %g3, [%o0 - 1], add %o1, 1)
>> 174 0:
>> 175 andcc %g4, 1, %g0
>> 176 be 5f
>> 177 nop
>> 178 retl
>> 179 mov %g1, %o0
57 5: 180 5:
58 rts !! 181 retl
59 mov r4,r0 !! 182 clr %o0
>> 183 __memset_end:
>> 184
>> 185 .section .fixup,#alloc,#execinstr
>> 186 .align 4
>> 187 20:
>> 188 cmp %g2, 8
>> 189 bleu 1f
>> 190 and %o1, 0x7f, %o1
>> 191 sub %g2, 9, %g2
>> 192 add %o3, 64, %o3
>> 193 1:
>> 194 sll %g2, 3, %g2
>> 195 add %o3, %o1, %o0
>> 196 b 30f
>> 197 sub %o0, %g2, %o0
>> 198 21:
>> 199 mov 8, %o0
>> 200 and %o1, 7, %o1
>> 201 sub %o0, %g2, %o0
>> 202 sll %o0, 3, %o0
>> 203 b 30f
>> 204 add %o0, %o1, %o0
>> 205 30:
>> 206 /* %o4 is faulting address, %o5 is %pc where fault occurred */
>> 207 save %sp, -104, %sp
>> 208 mov %i5, %o0
>> 209 mov %i7, %o1
>> 210 call lookup_fault
>> 211 mov %i4, %o2
>> 212 ret
>> 213 restore
>> 214
>> 215 .globl __bzero_end
>> 216 __bzero_end:
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