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authorAtsushi Nemoto <anemo@mba.ocn.ne.jp>2006-12-17 10:07:40 -0500
committerRalf Baechle <ralf@linux-mips.org>2007-02-06 11:53:12 -0500
commita583158c9ce822c96a718fbf877cec1e5f9ad75d (patch)
treed253705a57eab4ed485d1eebc55b6e5ad7b81969 /arch/mips/lib
parentc44e8d5e47b8ba672440b92eab0735628469116c (diff)
[MIPS] Unify memset.S
The 32-bit version and 64-bit version are almost equal. Unify them. This makes further improvements (for example, supporting CDEX, etc.) easier. Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/lib')
-rw-r--r--arch/mips/lib/Makefile2
-rw-r--r--arch/mips/lib/memset.S166
2 files changed, 167 insertions, 1 deletions
diff --git a/arch/mips/lib/Makefile b/arch/mips/lib/Makefile
index 989c900b8b14..5ad501b30b43 100644
--- a/arch/mips/lib/Makefile
+++ b/arch/mips/lib/Makefile
@@ -2,7 +2,7 @@
2# Makefile for MIPS-specific library files.. 2# Makefile for MIPS-specific library files..
3# 3#
4 4
5lib-y += csum_partial.o memcpy.o promlib.o \ 5lib-y += csum_partial.o memcpy.o memset.o promlib.o \
6 strlen_user.o strncpy_user.o strnlen_user.o uncached.o 6 strlen_user.o strncpy_user.o strnlen_user.o uncached.o
7 7
8obj-y += iomap.o 8obj-y += iomap.o
diff --git a/arch/mips/lib/memset.S b/arch/mips/lib/memset.S
new file mode 100644
index 000000000000..3f8b8b3d0b23
--- /dev/null
+++ b/arch/mips/lib/memset.S
@@ -0,0 +1,166 @@
1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 1998, 1999, 2000 by Ralf Baechle
7 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
8 */
9#include <asm/asm.h>
10#include <asm/asm-offsets.h>
11#include <asm/regdef.h>
12
13#if LONGSIZE == 4
14#define LONG_S_L swl
15#define LONG_S_R swr
16#else
17#define LONG_S_L sdl
18#define LONG_S_R sdr
19#endif
20
21#define EX(insn,reg,addr,handler) \
229: insn reg, addr; \
23 .section __ex_table,"a"; \
24 PTR 9b, handler; \
25 .previous
26
27 .macro f_fill64 dst, offset, val, fixup
28 EX(LONG_S, \val, (\offset + 0 * LONGSIZE)(\dst), \fixup)
29 EX(LONG_S, \val, (\offset + 1 * LONGSIZE)(\dst), \fixup)
30 EX(LONG_S, \val, (\offset + 2 * LONGSIZE)(\dst), \fixup)
31 EX(LONG_S, \val, (\offset + 3 * LONGSIZE)(\dst), \fixup)
32 EX(LONG_S, \val, (\offset + 4 * LONGSIZE)(\dst), \fixup)
33 EX(LONG_S, \val, (\offset + 5 * LONGSIZE)(\dst), \fixup)
34 EX(LONG_S, \val, (\offset + 6 * LONGSIZE)(\dst), \fixup)
35 EX(LONG_S, \val, (\offset + 7 * LONGSIZE)(\dst), \fixup)
36#if LONGSIZE == 4
37 EX(LONG_S, \val, (\offset + 8 * LONGSIZE)(\dst), \fixup)
38 EX(LONG_S, \val, (\offset + 9 * LONGSIZE)(\dst), \fixup)
39 EX(LONG_S, \val, (\offset + 10 * LONGSIZE)(\dst), \fixup)
40 EX(LONG_S, \val, (\offset + 11 * LONGSIZE)(\dst), \fixup)
41 EX(LONG_S, \val, (\offset + 12 * LONGSIZE)(\dst), \fixup)
42 EX(LONG_S, \val, (\offset + 13 * LONGSIZE)(\dst), \fixup)
43 EX(LONG_S, \val, (\offset + 14 * LONGSIZE)(\dst), \fixup)
44 EX(LONG_S, \val, (\offset + 15 * LONGSIZE)(\dst), \fixup)
45#endif
46 .endm
47
48/*
49 * memset(void *s, int c, size_t n)
50 *
51 * a0: start of area to clear
52 * a1: char to fill with
53 * a2: size of area to clear
54 */
55 .set noreorder
56 .align 5
57LEAF(memset)
58 beqz a1, 1f
59 move v0, a0 /* result */
60
61 andi a1, 0xff /* spread fillword */
62 LONG_SLL t1, a1, 8
63 or a1, t1
64 LONG_SLL t1, a1, 16
65#if LONGSIZE == 8
66 or a1, t1
67 LONG_SLL t1, a1, 32
68#endif
69 or a1, t1
701:
71
72FEXPORT(__bzero)
73 sltiu t0, a2, LONGSIZE /* very small region? */
74 bnez t0, small_memset
75 andi t0, a0, LONGMASK /* aligned? */
76
77 beqz t0, 1f
78 PTR_SUBU t0, LONGSIZE /* alignment in bytes */
79
80#ifdef __MIPSEB__
81 EX(LONG_S_L, a1, (a0), first_fixup) /* make word/dword aligned */
82#endif
83#ifdef __MIPSEL__
84 EX(LONG_S_R, a1, (a0), first_fixup) /* make word/dword aligned */
85#endif
86 PTR_SUBU a0, t0 /* long align ptr */
87 PTR_ADDU a2, t0 /* correct size */
88
891: ori t1, a2, 0x3f /* # of full blocks */
90 xori t1, 0x3f
91 beqz t1, memset_partial /* no block to fill */
92 andi t0, a2, 0x40-LONGSIZE
93
94 PTR_ADDU t1, a0 /* end address */
95 .set reorder
961: PTR_ADDIU a0, 64
97 f_fill64 a0, -64, a1, fwd_fixup
98 bne t1, a0, 1b
99 .set noreorder
100
101memset_partial:
102 PTR_LA t1, 2f /* where to start */
103#if LONGSIZE == 4
104 PTR_SUBU t1, t0
105#else
106 .set noat
107 LONG_SRL AT, t0, 1
108 PTR_SUBU t1, AT
109 .set noat
110#endif
111 jr t1
112 PTR_ADDU a0, t0 /* dest ptr */
113
114 .set push
115 .set noreorder
116 .set nomacro
117 f_fill64 a0, -64, a1, partial_fixup /* ... but first do longs ... */
1182: .set pop
119 andi a2, LONGMASK /* At most one long to go */
120
121 beqz a2, 1f
122 PTR_ADDU a0, a2 /* What's left */
123#ifdef __MIPSEB__
124 EX(LONG_S_R, a1, -1(a0), last_fixup)
125#endif
126#ifdef __MIPSEL__
127 EX(LONG_S_L, a1, -1(a0), last_fixup)
128#endif
1291: jr ra
130 move a2, zero
131
132small_memset:
133 beqz a2, 2f
134 PTR_ADDU t1, a0, a2
135
1361: PTR_ADDIU a0, 1 /* fill bytewise */
137 bne t1, a0, 1b
138 sb a1, -1(a0)
139
1402: jr ra /* done */
141 move a2, zero
142 END(memset)
143
144first_fixup:
145 jr ra
146 nop
147
148fwd_fixup:
149 PTR_L t0, TI_TASK($28)
150 LONG_L t0, THREAD_BUADDR(t0)
151 andi a2, 0x3f
152 LONG_ADDU a2, t1
153 jr ra
154 LONG_SUBU a2, t0
155
156partial_fixup:
157 PTR_L t0, TI_TASK($28)
158 LONG_L t0, THREAD_BUADDR(t0)
159 andi a2, LONGMASK
160 LONG_ADDU a2, t1
161 jr ra
162 LONG_SUBU a2, t0
163
164last_fixup:
165 jr ra
166 andi v1, a2, LONGMASK
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