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1da177e4 LT |
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/offset.h> | |
11 | #include <asm/regdef.h> | |
12 | ||
13 | #define EX(insn,reg,addr,handler) \ | |
14 | 9: insn reg, addr; \ | |
15 | .section __ex_table,"a"; \ | |
16 | PTR 9b, handler; \ | |
17 | .previous | |
18 | ||
19 | .macro f_fill64 dst, offset, val, fixup | |
20 | EX(LONG_S, \val, (\offset + 0 * LONGSIZE)(\dst), \fixup) | |
21 | EX(LONG_S, \val, (\offset + 1 * LONGSIZE)(\dst), \fixup) | |
22 | EX(LONG_S, \val, (\offset + 2 * LONGSIZE)(\dst), \fixup) | |
23 | EX(LONG_S, \val, (\offset + 3 * LONGSIZE)(\dst), \fixup) | |
24 | EX(LONG_S, \val, (\offset + 4 * LONGSIZE)(\dst), \fixup) | |
25 | EX(LONG_S, \val, (\offset + 5 * LONGSIZE)(\dst), \fixup) | |
26 | EX(LONG_S, \val, (\offset + 6 * LONGSIZE)(\dst), \fixup) | |
27 | EX(LONG_S, \val, (\offset + 7 * LONGSIZE)(\dst), \fixup) | |
28 | .endm | |
29 | ||
30 | /* | |
31 | * memset(void *s, int c, size_t n) | |
32 | * | |
33 | * a0: start of area to clear | |
34 | * a1: char to fill with | |
35 | * a2: size of area to clear | |
36 | */ | |
37 | .set noreorder | |
38 | .align 5 | |
39 | LEAF(memset) | |
40 | beqz a1, 1f | |
41 | move v0, a0 /* result */ | |
42 | ||
43 | andi a1, 0xff /* spread fillword */ | |
44 | dsll t1, a1, 8 | |
45 | or a1, t1 | |
46 | dsll t1, a1, 16 | |
47 | or a1, t1 | |
48 | dsll t1, a1, 32 | |
49 | or a1, t1 | |
50 | 1: | |
51 | ||
52 | FEXPORT(__bzero) | |
53 | sltiu t0, a2, LONGSIZE /* very small region? */ | |
54 | bnez t0, small_memset | |
55 | andi t0, a0, LONGMASK /* aligned? */ | |
56 | ||
57 | beqz t0, 1f | |
58 | PTR_SUBU t0, LONGSIZE /* alignment in bytes */ | |
59 | ||
60 | #ifdef __MIPSEB__ | |
61 | EX(sdl, a1, (a0), first_fixup) /* make dword aligned */ | |
62 | #endif | |
63 | #ifdef __MIPSEL__ | |
64 | EX(sdr, a1, (a0), first_fixup) /* make dword aligned */ | |
65 | #endif | |
66 | PTR_SUBU a0, t0 /* long align ptr */ | |
67 | PTR_ADDU a2, t0 /* correct size */ | |
68 | ||
69 | 1: ori t1, a2, 0x3f /* # of full blocks */ | |
70 | xori t1, 0x3f | |
71 | beqz t1, memset_partial /* no block to fill */ | |
72 | andi t0, a2, 0x38 | |
73 | ||
74 | PTR_ADDU t1, a0 /* end address */ | |
75 | .set reorder | |
76 | 1: PTR_ADDIU a0, 64 | |
77 | f_fill64 a0, -64, a1, fwd_fixup | |
78 | bne t1, a0, 1b | |
79 | .set noreorder | |
80 | ||
81 | memset_partial: | |
82 | PTR_LA t1, 2f /* where to start */ | |
83 | .set noat | |
84 | dsrl AT, t0, 1 | |
85 | PTR_SUBU t1, AT | |
86 | .set noat | |
87 | jr t1 | |
88 | PTR_ADDU a0, t0 /* dest ptr */ | |
89 | ||
90 | .set push | |
91 | .set noreorder | |
92 | .set nomacro | |
93 | f_fill64 a0, -64, a1, partial_fixup /* ... but first do longs ... */ | |
94 | 2: .set pop | |
95 | andi a2, LONGMASK /* At most one long to go */ | |
96 | ||
97 | beqz a2, 1f | |
98 | PTR_ADDU a0, a2 /* What's left */ | |
99 | #ifdef __MIPSEB__ | |
100 | EX(sdr, a1, -1(a0), last_fixup) | |
101 | #endif | |
102 | #ifdef __MIPSEL__ | |
103 | EX(sdl, a1, -1(a0), last_fixup) | |
104 | #endif | |
105 | 1: jr ra | |
106 | move a2, zero | |
107 | ||
108 | small_memset: | |
109 | beqz a2, 2f | |
110 | PTR_ADDU t1, a0, a2 | |
111 | ||
112 | 1: PTR_ADDIU a0, 1 /* fill bytewise */ | |
113 | bne t1, a0, 1b | |
114 | sb a1, -1(a0) | |
115 | ||
116 | 2: jr ra /* done */ | |
117 | move a2, zero | |
118 | END(memset) | |
119 | ||
120 | first_fixup: | |
121 | jr ra | |
122 | nop | |
123 | ||
124 | fwd_fixup: | |
125 | PTR_L t0, TI_TASK($28) | |
126 | LONG_L t0, THREAD_BUADDR(t0) | |
127 | andi a2, 0x3f | |
128 | LONG_ADDU a2, t1 | |
129 | jr ra | |
130 | LONG_SUBU a2, t0 | |
131 | ||
132 | partial_fixup: | |
133 | PTR_L t0, TI_TASK($28) | |
134 | LONG_L t0, THREAD_BUADDR(t0) | |
135 | andi a2, LONGMASK | |
136 | LONG_ADDU a2, t1 | |
137 | jr ra | |
138 | LONG_SUBU a2, t0 | |
139 | ||
140 | last_fixup: | |
141 | jr ra | |
142 | andi v1, a2, LONGMASK |