| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
| Sam Ravnborg | 048eb58 | 2005-09-09 22:32:31 +0200 | [diff] [blame] | 10 | #include <asm/asm-offsets.h> |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 |