232 lines
5.0 KiB
ArmAsm
232 lines
5.0 KiB
ArmAsm
/* Copyright (C) 2006 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by MontaVista Software, Inc. (written by Nicolas Pitre)
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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/* Copyright (C) 2008 Vincent Torri
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modification of the name and of the entry / end declaration
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*/
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/*
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* Data preload for architectures that support it (ARM V5TE and above)
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*/
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#if (!defined (__ARM_ARCH_2__) && !defined (__ARM_ARCH_3__) \
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&& !defined (__ARM_ARCH_3M__) && !defined (__ARM_ARCH_4__) \
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&& !defined (__ARM_ARCH_4T__) && !defined (__ARM_ARCH_5__) \
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&& !defined (__ARM_ARCH_5T__))
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#define PLD(code...) code
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#else
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#define PLD(code...)
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#endif
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/*
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* This can be used to enable code to cacheline align the source pointer.
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* Experiments on tested architectures (StrongARM and XScale) didn't show
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* this a worthwhile thing to do. That might be different in the future.
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*/
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//#define CALGN(code...) code
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#define CALGN(code...)
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/*
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* Endian independent macros for shifting bytes within registers.
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*/
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#ifndef __ARMEB__
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#define pull lsr
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#define push lsl
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#else
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#define pull lsl
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#define push lsr
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#endif
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.text
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/* Prototype: void *memcpy_glibc(void *dest, const void *src, size_t n); */
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.align
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.global memcpy_glibc
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.func memcpy_glibc
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memcpy_glibc:
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stmfd sp!, {r0, r4, lr}
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subs r2, r2, #4
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blt 8f
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ands ip, r0, #3
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PLD( pld [r1, #0] )
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bne 9f
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ands ip, r1, #3
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bne 10f
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1: subs r2, r2, #(28)
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stmfd sp!, {r5 - r8}
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blt 5f
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CALGN( ands ip, r1, #31 )
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CALGN( rsb r3, ip, #32 )
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CALGN( sbcnes r4, r3, r2 ) @ C is always set here
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CALGN( bcs 2f )
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CALGN( adr r4, 6f )
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CALGN( subs r2, r2, r3 ) @ C gets set
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CALGN( add pc, r4, ip )
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PLD( pld [r1, #0] )
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2: PLD( subs r2, r2, #96 )
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PLD( pld [r1, #28] )
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PLD( blt 4f )
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PLD( pld [r1, #60] )
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PLD( pld [r1, #92] )
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3: PLD( pld [r1, #124] )
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4: ldmia r1!, {r3, r4, r5, r6, r7, r8, ip, lr}
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subs r2, r2, #32
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stmia r0!, {r3, r4, r5, r6, r7, r8, ip, lr}
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bge 3b
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PLD( cmn r2, #96 )
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PLD( bge 4b )
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5: ands ip, r2, #28
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rsb ip, ip, #32
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addne pc, pc, ip @ C is always clear here
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b 7f
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6: nop
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ldr r3, [r1], #4
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ldr r4, [r1], #4
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ldr r5, [r1], #4
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ldr r6, [r1], #4
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ldr r7, [r1], #4
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ldr r8, [r1], #4
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ldr lr, [r1], #4
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add pc, pc, ip
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nop
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nop
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str r3, [r0], #4
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str r4, [r0], #4
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str r5, [r0], #4
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str r6, [r0], #4
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str r7, [r0], #4
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str r8, [r0], #4
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str lr, [r0], #4
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CALGN( bcs 2b )
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7: ldmfd sp!, {r5 - r8}
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8: movs r2, r2, lsl #31
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ldrneb r3, [r1], #1
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ldrcsb r4, [r1], #1
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ldrcsb ip, [r1]
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strneb r3, [r0], #1
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strcsb r4, [r0], #1
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strcsb ip, [r0]
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ldmfd sp!, {r0, r4, pc}
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9: rsb ip, ip, #4
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cmp ip, #2
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ldrgtb r3, [r1], #1
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ldrgeb r4, [r1], #1
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ldrb lr, [r1], #1
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strgtb r3, [r0], #1
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strgeb r4, [r0], #1
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subs r2, r2, ip
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strb lr, [r0], #1
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blt 8b
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ands ip, r1, #3
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beq 1b
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10: bic r1, r1, #3
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cmp ip, #2
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ldr lr, [r1], #4
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beq 17f
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bgt 18f
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.macro forward_copy_shift pull push
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subs r2, r2, #28
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blt 14f
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CALGN( ands ip, r1, #31 )
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CALGN( rsb ip, ip, #32 )
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CALGN( sbcnes r4, ip, r2 ) @ C is always set here
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CALGN( subcc r2, r2, ip )
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CALGN( bcc 15f )
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11: stmfd sp!, {r5 - r9}
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PLD( pld [r1, #0] )
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PLD( subs r2, r2, #96 )
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PLD( pld [r1, #28] )
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PLD( blt 13f )
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PLD( pld [r1, #60] )
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PLD( pld [r1, #92] )
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12: PLD( pld [r1, #124] )
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13: ldmia r1!, {r4, r5, r6, r7}
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mov r3, lr, pull #\pull
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subs r2, r2, #32
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ldmia r1!, {r8, r9, ip, lr}
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orr r3, r3, r4, push #\push
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mov r4, r4, pull #\pull
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orr r4, r4, r5, push #\push
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mov r5, r5, pull #\pull
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orr r5, r5, r6, push #\push
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mov r6, r6, pull #\pull
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orr r6, r6, r7, push #\push
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mov r7, r7, pull #\pull
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orr r7, r7, r8, push #\push
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mov r8, r8, pull #\pull
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orr r8, r8, r9, push #\push
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mov r9, r9, pull #\pull
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orr r9, r9, ip, push #\push
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mov ip, ip, pull #\pull
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orr ip, ip, lr, push #\push
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stmia r0!, {r3, r4, r5, r6, r7, r8, r9, ip}
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bge 12b
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PLD( cmn r2, #96 )
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PLD( bge 13b )
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ldmfd sp!, {r5 - r9}
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14: ands ip, r2, #28
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beq 16f
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15: mov r3, lr, pull #\pull
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ldr lr, [r1], #4
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subs ip, ip, #4
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orr r3, r3, lr, push #\push
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str r3, [r0], #4
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bgt 15b
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CALGN( cmp r2, #0 )
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CALGN( bge 11b )
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16: sub r1, r1, #(\push / 8)
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b 8b
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.endm
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forward_copy_shift pull=8 push=24
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17: forward_copy_shift pull=16 push=16
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18: forward_copy_shift pull=24 push=8
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.endfunc
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