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 * Copyright (C) 2007 Maciej W. Rozycki 9 */ 10#include <asm/asm.h> 11#include <asm/asm-offsets.h> 12#include <asm/regdef.h> 13 14#if LONGSIZE == 4 15#define LONG_S_L swl 16#define LONG_S_R swr 17#else 18#define LONG_S_L sdl 19#define LONG_S_R sdr 20#endif 21 22#define EX(insn,reg,addr,handler) \ 239: insn reg, addr; \ 24 .section __ex_table,"a"; \ 25 PTR 9b, handler; \ 26 .previous 27 28 .macro f_fill64 dst, offset, val, fixup 29 EX(LONG_S, \val, (\offset + 0 * LONGSIZE)(\dst), \fixup) 30 EX(LONG_S, \val, (\offset + 1 * LONGSIZE)(\dst), \fixup) 31 EX(LONG_S, \val, (\offset + 2 * LONGSIZE)(\dst), \fixup) 32 EX(LONG_S, \val, (\offset + 3 * LONGSIZE)(\dst), \fixup) 33 EX(LONG_S, \val, (\offset + 4 * LONGSIZE)(\dst), \fixup) 34 EX(LONG_S, \val, (\offset + 5 * LONGSIZE)(\dst), \fixup) 35 EX(LONG_S, \val, (\offset + 6 * LONGSIZE)(\dst), \fixup) 36 EX(LONG_S, \val, (\offset + 7 * LONGSIZE)(\dst), \fixup) 37#if LONGSIZE == 4 38 EX(LONG_S, \val, (\offset + 8 * LONGSIZE)(\dst), \fixup) 39 EX(LONG_S, \val, (\offset + 9 * LONGSIZE)(\dst), \fixup) 40 EX(LONG_S, \val, (\offset + 10 * LONGSIZE)(\dst), \fixup) 41 EX(LONG_S, \val, (\offset + 11 * LONGSIZE)(\dst), \fixup) 42 EX(LONG_S, \val, (\offset + 12 * LONGSIZE)(\dst), \fixup) 43 EX(LONG_S, \val, (\offset + 13 * LONGSIZE)(\dst), \fixup) 44 EX(LONG_S, \val, (\offset + 14 * LONGSIZE)(\dst), \fixup) 45 EX(LONG_S, \val, (\offset + 15 * LONGSIZE)(\dst), \fixup) 46#endif 47 .endm 48 49/* 50 * memset(void *s, int c, size_t n) 51 * 52 * a0: start of area to clear 53 * a1: char to fill with 54 * a2: size of area to clear 55 */ 56 .set noreorder 57 .align 5 58LEAF(memset) 59 beqz a1, 1f 60 move v0, a0 /* result */ 61 62 andi a1, 0xff /* spread fillword */ 63 LONG_SLL t1, a1, 8 64 or a1, t1 65 LONG_SLL t1, a1, 16 66#if LONGSIZE == 8 67 or a1, t1 68 LONG_SLL t1, a1, 32 69#endif 70 or a1, t1 711: 72 73FEXPORT(__bzero) 74 sltiu t0, a2, LONGSIZE /* very small region? */ 75 bnez t0, .Lsmall_memset 76 andi t0, a0, LONGMASK /* aligned? */ 77 78#ifndef CONFIG_CPU_DADDI_WORKAROUNDS 79 beqz t0, 1f 80 PTR_SUBU t0, LONGSIZE /* alignment in bytes */ 81#else 82 .set noat 83 li AT, LONGSIZE 84 beqz t0, 1f 85 PTR_SUBU t0, AT /* alignment in bytes */ 86 .set at 87#endif 88 89 R10KCBARRIER(0(ra)) 90#ifdef __MIPSEB__ 91 EX(LONG_S_L, a1, (a0), .Lfirst_fixup) /* make word/dword aligned */ 92#endif 93#ifdef __MIPSEL__ 94 EX(LONG_S_R, a1, (a0), .Lfirst_fixup) /* make word/dword aligned */ 95#endif 96 PTR_SUBU a0, t0 /* long align ptr */ 97 PTR_ADDU a2, t0 /* correct size */ 98 991: ori t1, a2, 0x3f /* # of full blocks */ 100 xori t1, 0x3f 101 beqz t1, .Lmemset_partial /* no block to fill */ 102 andi t0, a2, 0x40-LONGSIZE 103 104 PTR_ADDU t1, a0 /* end address */ 105 .set reorder 1061: PTR_ADDIU a0, 64 107 R10KCBARRIER(0(ra)) 108 f_fill64 a0, -64, a1, .Lfwd_fixup 109 bne t1, a0, 1b 110 .set noreorder 111 112.Lmemset_partial: 113 R10KCBARRIER(0(ra)) 114 PTR_LA t1, 2f /* where to start */ 115#if LONGSIZE == 4 116 PTR_SUBU t1, t0 117#else 118 .set noat 119 LONG_SRL AT, t0, 1 120 PTR_SUBU t1, AT 121 .set at 122#endif 123 jr t1 124 PTR_ADDU a0, t0 /* dest ptr */ 125 126 .set push 127 .set noreorder 128 .set nomacro 129 f_fill64 a0, -64, a1, .Lpartial_fixup /* ... but first do longs ... */ 1302: .set pop 131 andi a2, LONGMASK /* At most one long to go */ 132 133 beqz a2, 1f 134 PTR_ADDU a0, a2 /* What's left */ 135 R10KCBARRIER(0(ra)) 136#ifdef __MIPSEB__ 137 EX(LONG_S_R, a1, -1(a0), .Llast_fixup) 138#endif 139#ifdef __MIPSEL__ 140 EX(LONG_S_L, a1, -1(a0), .Llast_fixup) 141#endif 1421: jr ra 143 move a2, zero 144 145.Lsmall_memset: 146 beqz a2, 2f 147 PTR_ADDU t1, a0, a2 148 1491: PTR_ADDIU a0, 1 /* fill bytewise */ 150 R10KCBARRIER(0(ra)) 151 bne t1, a0, 1b 152 sb a1, -1(a0) 153 1542: jr ra /* done */ 155 move a2, zero 156 END(memset) 157 158.Lfirst_fixup: 159 jr ra 160 nop 161 162.Lfwd_fixup: 163 PTR_L t0, TI_TASK($28) 164 LONG_L t0, THREAD_BUADDR(t0) 165 andi a2, 0x3f 166 LONG_ADDU a2, t1 167 jr ra 168 LONG_SUBU a2, t0 169 170.Lpartial_fixup: 171 PTR_L t0, TI_TASK($28) 172 LONG_L t0, THREAD_BUADDR(t0) 173 andi a2, LONGMASK 174 LONG_ADDU a2, t1 175 jr ra 176 LONG_SUBU a2, t0 177 178.Llast_fixup: 179 jr ra 180 andi v1, a2, LONGMASK 181