1/* 2 * String handling functions for PowerPC. 3 * 4 * Copyright (C) 1996 Paul Mackerras. 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * as published by the Free Software Foundation; either version 9 * 2 of the License, or (at your option) any later version. 10 */ 11#include <asm/processor.h> 12#include <asm/errno.h> 13#include <asm/ppc_asm.h> 14#include <asm/export.h> 15 16_GLOBAL(__memset16) 17 rlwimi r4,r4,16,0,15 18 /* fall through */ 19 20_GLOBAL(__memset32) 21 rldimi r4,r4,32,0 22 /* fall through */ 23 24_GLOBAL(__memset64) 25 neg r0,r3 26 andi. r0,r0,7 27 cmplw cr1,r5,r0 28 b .Lms 29EXPORT_SYMBOL(__memset16) 30EXPORT_SYMBOL(__memset32) 31EXPORT_SYMBOL(__memset64) 32 33_GLOBAL(memset) 34 neg r0,r3 35 rlwimi r4,r4,8,16,23 36 andi. r0,r0,7 /* # bytes to be 8-byte aligned */ 37 rlwimi r4,r4,16,0,15 38 cmplw cr1,r5,r0 /* do we get that far? */ 39 rldimi r4,r4,32,0 40.Lms: PPC_MTOCRF(1,r0) 41 mr r6,r3 42 blt cr1,8f 43 beq+ 3f /* if already 8-byte aligned */ 44 subf r5,r0,r5 45 bf 31,1f 46 stb r4,0(r6) 47 addi r6,r6,1 481: bf 30,2f 49 sth r4,0(r6) 50 addi r6,r6,2 512: bf 29,3f 52 stw r4,0(r6) 53 addi r6,r6,4 543: srdi. r0,r5,6 55 clrldi r5,r5,58 56 mtctr r0 57 beq 5f 58 .balign 16 594: std r4,0(r6) 60 std r4,8(r6) 61 std r4,16(r6) 62 std r4,24(r6) 63 std r4,32(r6) 64 std r4,40(r6) 65 std r4,48(r6) 66 std r4,56(r6) 67 addi r6,r6,64 68 bdnz 4b 695: srwi. r0,r5,3 70 clrlwi r5,r5,29 71 PPC_MTOCRF(1,r0) 72 beq 8f 73 bf 29,6f 74 std r4,0(r6) 75 std r4,8(r6) 76 std r4,16(r6) 77 std r4,24(r6) 78 addi r6,r6,32 796: bf 30,7f 80 std r4,0(r6) 81 std r4,8(r6) 82 addi r6,r6,16 837: bf 31,8f 84 std r4,0(r6) 85 addi r6,r6,8 868: cmpwi r5,0 87 PPC_MTOCRF(1,r5) 88 beqlr+ 89 bf 29,9f 90 stw r4,0(r6) 91 addi r6,r6,4 929: bf 30,10f 93 sth r4,0(r6) 94 addi r6,r6,2 9510: bflr 31 96 stb r4,0(r6) 97 blr 98EXPORT_SYMBOL(memset) 99 100_GLOBAL_TOC(memmove) 101 cmplw 0,r3,r4 102 bgt backwards_memcpy 103 b memcpy 104 105_GLOBAL(backwards_memcpy) 106 rlwinm. r7,r5,32-3,3,31 /* r0 = r5 >> 3 */ 107 add r6,r3,r5 108 add r4,r4,r5 109 beq 2f 110 andi. r0,r6,3 111 mtctr r7 112 bne 5f 113 .balign 16 1141: lwz r7,-4(r4) 115 lwzu r8,-8(r4) 116 stw r7,-4(r6) 117 stwu r8,-8(r6) 118 bdnz 1b 119 andi. r5,r5,7 1202: cmplwi 0,r5,4 121 blt 3f 122 lwzu r0,-4(r4) 123 subi r5,r5,4 124 stwu r0,-4(r6) 1253: cmpwi 0,r5,0 126 beqlr 127 mtctr r5 1284: lbzu r0,-1(r4) 129 stbu r0,-1(r6) 130 bdnz 4b 131 blr 1325: mtctr r0 1336: lbzu r7,-1(r4) 134 stbu r7,-1(r6) 135 bdnz 6b 136 subf r5,r0,r5 137 rlwinm. r7,r5,32-3,3,31 138 beq 2b 139 mtctr r7 140 b 1b 141EXPORT_SYMBOL(memmove) 142