summaryrefslogtreecommitdiffstats
path: root/arch/sparc/lib/memset.S
blob: f75e6906df146aae9a99cc83c6750903f9853783 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
/* linux/arch/sparc/lib/memset.S: Sparc optimized memset, bzero and clear_user code
 * Copyright (C) 1991,1996 Free Software Foundation
 * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
 *
 * Calls to memset returns initial %o0. Calls to bzero returns 0, if ok, and
 * number of bytes not yet set if exception occurs and we were called as
 * clear_user.
 */

#include <asm/ptrace.h>

/* Work around cpp -rob */
#define ALLOC #alloc
#define EXECINSTR #execinstr
#define EX(x,y,a,b) 				\
98: 	x,y;					\
	.section .fixup,ALLOC,EXECINSTR;	\
	.align	4;				\
99:	ba 30f;					\
	 a, b, %o0;				\
	.section __ex_table,ALLOC;		\
	.align	4;				\
	.word	98b, 99b;			\
	.text;					\
	.align	4

#define EXT(start,end,handler) 			\
	.section __ex_table,ALLOC;		\
	.align	4;				\
	.word	start, 0, end, handler;		\
	.text;					\
	.align	4

/* Please don't change these macros, unless you change the logic
 * in the .fixup section below as well.
 * Store 64 bytes at (BASE + OFFSET) using value SOURCE. */
#define ZERO_BIG_BLOCK(base, offset, source)    \
	std	source, [base + offset + 0x00]; \
	std	source, [base + offset + 0x08]; \
	std	source, [base + offset + 0x10]; \
	std	source, [base + offset + 0x18]; \
	std	source, [base + offset + 0x20]; \
	std	source, [base + offset + 0x28]; \
	std	source, [base + offset + 0x30]; \
	std	source, [base + offset + 0x38];

#define ZERO_LAST_BLOCKS(base, offset, source)	\
	std	source, [base - offset - 0x38]; \
	std	source, [base - offset - 0x30]; \
	std	source, [base - offset - 0x28]; \
	std	source, [base - offset - 0x20]; \
	std	source, [base - offset - 0x18]; \
	std	source, [base - offset - 0x10]; \
	std	source, [base - offset - 0x08]; \
	std	source, [base - offset - 0x00];

	.text
	.align 4

        .globl  __bzero_begin
__bzero_begin:

	.globl	__bzero
	.globl	memset
	.globl	__memset_start, __memset_end
__memset_start:
memset:
	mov	%o0, %g1
	mov	1, %g4
	and	%o1, 0xff, %g3
	sll	%g3, 8, %g2
	or	%g3, %g2, %g3
	sll	%g3, 16, %g2
	or	%g3, %g2, %g3
	b	1f
	 mov	%o2, %o1
3:
	cmp	%o2, 3
	be	2f
	 EX(stb	%g3, [%o0], sub %o1, 0)

	cmp	%o2, 2
	be	2f
	 EX(stb	%g3, [%o0 + 0x01], sub %o1, 1)

	EX(stb	%g3, [%o0 + 0x02], sub %o1, 2)
2:
	sub	%o2, 4, %o2
	add	%o1, %o2, %o1
	b	4f
	 sub	%o0, %o2, %o0

__bzero:
	clr	%g4
	mov	%g0, %g3
1:
	cmp	%o1, 7
	bleu	7f
	 andcc	%o0, 3, %o2

	bne	3b
4:
	 andcc	%o0, 4, %g0

	be	2f
	 mov	%g3, %g2

	EX(st	%g3, [%o0], sub %o1, 0)
	sub	%o1, 4, %o1
	add	%o0, 4, %o0
2:
	andcc	%o1, 0xffffff80, %o3	! Now everything is 8 aligned and o1 is len to run
	be	9f
	 andcc	%o1, 0x78, %o2
10:
	ZERO_BIG_BLOCK(%o0, 0x00, %g2)
	subcc	%o3, 128, %o3
	ZERO_BIG_BLOCK(%o0, 0x40, %g2)
11:
	EXT(10b, 11b, 20f)
	bne	10b
	 add	%o0, 128, %o0

	orcc	%o2, %g0, %g0
9:
	be	13f
	 andcc	%o1, 7, %o1

	srl	%o2, 1, %o3
	set	13f, %o4
	sub	%o4, %o3, %o4
	jmp	%o4
	 add	%o0, %o2, %o0

12:
	ZERO_LAST_BLOCKS(%o0, 0x48, %g2)
	ZERO_LAST_BLOCKS(%o0, 0x08, %g2)
13:
	be	8f
	 andcc	%o1, 4, %g0

	be	1f
	 andcc	%o1, 2, %g0

	EX(st	%g3, [%o0], and %o1, 7)
	add	%o0, 4, %o0
1:
	be	1f
	 andcc	%o1, 1, %g0

	EX(sth	%g3, [%o0], and %o1, 3)
	add	%o0, 2, %o0
1:
	bne,a	8f
	 EX(stb	%g3, [%o0], and %o1, 1)
8:
	b	0f
	 nop
7:
	be	13b
	 orcc	%o1, 0, %g0

	be	0f
8:
	 add	%o0, 1, %o0
	subcc	%o1, 1, %o1
	bne	8b
	 EX(stb	%g3, [%o0 - 1], add %o1, 1)
0:
	andcc	%g4, 1, %g0
	be	5f
	 nop
	retl
	 mov	%g1, %o0
5:
	retl
	 clr	%o0
__memset_end:

	.section .fixup,#alloc,#execinstr
	.align	4
20:
	cmp	%g2, 8
	bleu	1f
	 and	%o1, 0x7f, %o1
	sub	%g2, 9, %g2
	add	%o3, 64, %o3
1:
	sll	%g2, 3, %g2
	add	%o3, %o1, %o0
	b 30f
	 sub	%o0, %g2, %o0
21:
	mov	8, %o0
	and	%o1, 7, %o1
	sub	%o0, %g2, %o0
	sll	%o0, 3, %o0
	b 30f
	 add	%o0, %o1, %o0
30:
/* %o4 is faulting address, %o5 is %pc where fault occurred */
	save	%sp, -104, %sp
	mov	%i5, %o0
	mov	%i7, %o1
	call	lookup_fault
	 mov	%i4, %o2
	ret
	 restore

	.globl __bzero_end
__bzero_end:
OpenPOWER on IntegriCloud