diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/arm/lib/memmove.S')
| -rw-r--r-- | ANDROID_3.4.5/arch/arm/lib/memmove.S | 199 |
1 files changed, 0 insertions, 199 deletions
diff --git a/ANDROID_3.4.5/arch/arm/lib/memmove.S b/ANDROID_3.4.5/arch/arm/lib/memmove.S deleted file mode 100644 index 938fc14f..00000000 --- a/ANDROID_3.4.5/arch/arm/lib/memmove.S +++ /dev/null @@ -1,199 +0,0 @@ -/* - * linux/arch/arm/lib/memmove.S - * - * Author: Nicolas Pitre - * Created: Sep 28, 2005 - * Copyright: (C) MontaVista Software Inc. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - */ - -#include <linux/linkage.h> -#include <asm/assembler.h> - - .text - -/* - * Prototype: void *memmove(void *dest, const void *src, size_t n); - * - * Note: - * - * If the memory regions don't overlap, we simply branch to memcpy which is - * normally a bit faster. Otherwise the copy is done going downwards. This - * is a transposition of the code from copy_template.S but with the copy - * occurring in the opposite direction. - */ - -ENTRY(memmove) - - subs ip, r0, r1 - cmphi r2, ip - bls memcpy - - stmfd sp!, {r0, r4, lr} - add r1, r1, r2 - add r0, r0, r2 - subs r2, r2, #4 - blt 8f - ands ip, r0, #3 - PLD( pld [r1, #-4] ) - bne 9f - ands ip, r1, #3 - bne 10f - -1: subs r2, r2, #(28) - stmfd sp!, {r5 - r8} - blt 5f - - CALGN( ands ip, r0, #31 ) - CALGN( sbcnes r4, ip, r2 ) @ C is always set here - CALGN( bcs 2f ) - CALGN( adr r4, 6f ) - CALGN( subs r2, r2, ip ) @ C is set here - CALGN( rsb ip, ip, #32 ) - CALGN( add pc, r4, ip ) - - PLD( pld [r1, #-4] ) -2: PLD( subs r2, r2, #96 ) - PLD( pld [r1, #-32] ) - PLD( blt 4f ) - PLD( pld [r1, #-64] ) - PLD( pld [r1, #-96] ) - -3: PLD( pld [r1, #-128] ) -4: ldmdb r1!, {r3, r4, r5, r6, r7, r8, ip, lr} - subs r2, r2, #32 - stmdb r0!, {r3, r4, r5, r6, r7, r8, ip, lr} - bge 3b - PLD( cmn r2, #96 ) - PLD( bge 4b ) - -5: ands ip, r2, #28 - rsb ip, ip, #32 - addne pc, pc, ip @ C is always clear here - b 7f -6: W(nop) - W(ldr) r3, [r1, #-4]! - W(ldr) r4, [r1, #-4]! - W(ldr) r5, [r1, #-4]! - W(ldr) r6, [r1, #-4]! - W(ldr) r7, [r1, #-4]! - W(ldr) r8, [r1, #-4]! - W(ldr) lr, [r1, #-4]! - - add pc, pc, ip - nop - W(nop) - W(str) r3, [r0, #-4]! - W(str) r4, [r0, #-4]! - W(str) r5, [r0, #-4]! - W(str) r6, [r0, #-4]! - W(str) r7, [r0, #-4]! - W(str) r8, [r0, #-4]! - W(str) lr, [r0, #-4]! - - CALGN( bcs 2b ) - -7: ldmfd sp!, {r5 - r8} - -8: movs r2, r2, lsl #31 - ldrneb r3, [r1, #-1]! - ldrcsb r4, [r1, #-1]! - ldrcsb ip, [r1, #-1] - strneb r3, [r0, #-1]! - strcsb r4, [r0, #-1]! - strcsb ip, [r0, #-1] - ldmfd sp!, {r0, r4, pc} - -9: cmp ip, #2 - ldrgtb r3, [r1, #-1]! - ldrgeb r4, [r1, #-1]! - ldrb lr, [r1, #-1]! - strgtb r3, [r0, #-1]! - strgeb r4, [r0, #-1]! - subs r2, r2, ip - strb lr, [r0, #-1]! - blt 8b - ands ip, r1, #3 - beq 1b - -10: bic r1, r1, #3 - cmp ip, #2 - ldr r3, [r1, #0] - beq 17f - blt 18f - - - .macro backward_copy_shift push pull - - subs r2, r2, #28 - blt 14f - - CALGN( ands ip, r0, #31 ) - CALGN( sbcnes r4, ip, r2 ) @ C is always set here - CALGN( subcc r2, r2, ip ) - CALGN( bcc 15f ) - -11: stmfd sp!, {r5 - r9} - - PLD( pld [r1, #-4] ) - PLD( subs r2, r2, #96 ) - PLD( pld [r1, #-32] ) - PLD( blt 13f ) - PLD( pld [r1, #-64] ) - PLD( pld [r1, #-96] ) - -12: PLD( pld [r1, #-128] ) -13: ldmdb r1!, {r7, r8, r9, ip} - mov lr, r3, push #\push - subs r2, r2, #32 - ldmdb r1!, {r3, r4, r5, r6} - orr lr, lr, ip, pull #\pull - mov ip, ip, push #\push - orr ip, ip, r9, pull #\pull - mov r9, r9, push #\push - orr r9, r9, r8, pull #\pull - mov r8, r8, push #\push - orr r8, r8, r7, pull #\pull - mov r7, r7, push #\push - orr r7, r7, r6, pull #\pull - mov r6, r6, push #\push - orr r6, r6, r5, pull #\pull - mov r5, r5, push #\push - orr r5, r5, r4, pull #\pull - mov r4, r4, push #\push - orr r4, r4, r3, pull #\pull - stmdb r0!, {r4 - r9, ip, lr} - bge 12b - PLD( cmn r2, #96 ) - PLD( bge 13b ) - - ldmfd sp!, {r5 - r9} - -14: ands ip, r2, #28 - beq 16f - -15: mov lr, r3, push #\push - ldr r3, [r1, #-4]! - subs ip, ip, #4 - orr lr, lr, r3, pull #\pull - str lr, [r0, #-4]! - bgt 15b - CALGN( cmp r2, #0 ) - CALGN( bge 11b ) - -16: add r1, r1, #(\pull / 8) - b 8b - - .endm - - - backward_copy_shift push=8 pull=24 - -17: backward_copy_shift push=16 pull=16 - -18: backward_copy_shift push=24 pull=8 - -ENDPROC(memmove) |