2013-12-06 12:04:52 +01:00
|
|
|
/* $NetBSD: memmove.S,v 1.7 2013/11/30 20:20:42 joerg Exp $ */
|
2011-02-14 20:36:03 +01:00
|
|
|
|
|
|
|
|
/*-
|
|
|
|
|
* Copyright (c) 1997 The NetBSD Foundation, Inc.
|
|
|
|
|
* All rights reserved.
|
|
|
|
|
*
|
|
|
|
|
* This code is derived from software contributed to The NetBSD Foundation
|
|
|
|
|
* by Neil A. Carson and Mark Brinicombe
|
|
|
|
|
*
|
|
|
|
|
* Redistribution and use in source and binary forms, with or without
|
|
|
|
|
* modification, are permitted provided that the following conditions
|
|
|
|
|
* are met:
|
|
|
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
|
|
|
* notice, this list of conditions and the following disclaimer.
|
|
|
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
|
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
|
|
|
* documentation and/or other materials provided with the distribution.
|
|
|
|
|
*
|
|
|
|
|
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
|
|
|
|
|
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
|
|
|
|
|
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
|
|
|
|
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
|
|
|
|
|
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
|
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
|
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
|
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
|
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
|
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
|
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
#include <machine/asm.h>
|
|
|
|
|
|
|
|
|
|
#ifndef _BCOPY
|
|
|
|
|
/* LINTSTUB: Func: void *memmove(void *, const void *, size_t) */
|
|
|
|
|
ENTRY(memmove)
|
|
|
|
|
#else
|
|
|
|
|
/* bcopy = memcpy/memmove with arguments reversed. */
|
|
|
|
|
/* LINTSTUB: Func: void bcopy(void *, void *, size_t) */
|
|
|
|
|
ENTRY(bcopy)
|
|
|
|
|
/* switch the source and destination registers */
|
|
|
|
|
eor r0, r1, r0
|
|
|
|
|
eor r1, r0, r1
|
|
|
|
|
eor r0, r1, r0
|
|
|
|
|
#endif
|
|
|
|
|
/* Do the buffers overlap? */
|
|
|
|
|
cmp r0, r1
|
|
|
|
|
RETc(eq) /* Bail now if src/dst are the same */
|
|
|
|
|
subhs r3, r0, r1 /* if (dst > src) r3 = dst - src */
|
|
|
|
|
sublo r3, r1, r0 /* if (src > dst) r3 = src - dst */
|
|
|
|
|
cmp r3, r2 /* if (r3 >= len) we have an overlap */
|
2013-12-06 12:04:52 +01:00
|
|
|
bhs PLT_SYM(_C_LABEL(memcpy))
|
2011-02-14 20:36:03 +01:00
|
|
|
|
|
|
|
|
/* Determine copy direction */
|
|
|
|
|
cmp r1, r0
|
|
|
|
|
bcc .Lmemmove_backwards
|
|
|
|
|
|
|
|
|
|
moveq r0, #0 /* Quick abort for len=0 */
|
|
|
|
|
RETc(eq)
|
|
|
|
|
|
2013-12-06 12:04:52 +01:00
|
|
|
push {r0, lr} /* memmove() returns dest addr */
|
2011-02-14 20:36:03 +01:00
|
|
|
subs r2, r2, #4
|
|
|
|
|
blt .Lmemmove_fl4 /* less than 4 bytes */
|
|
|
|
|
ands r12, r0, #3
|
|
|
|
|
bne .Lmemmove_fdestul /* oh unaligned destination addr */
|
|
|
|
|
ands r12, r1, #3
|
|
|
|
|
bne .Lmemmove_fsrcul /* oh unaligned source addr */
|
|
|
|
|
|
|
|
|
|
.Lmemmove_ft8:
|
|
|
|
|
/* We have aligned source and destination */
|
|
|
|
|
subs r2, r2, #8
|
|
|
|
|
blt .Lmemmove_fl12 /* less than 12 bytes (4 from above) */
|
|
|
|
|
subs r2, r2, #0x14
|
|
|
|
|
blt .Lmemmove_fl32 /* less than 32 bytes (12 from above) */
|
2013-12-06 12:04:52 +01:00
|
|
|
push {r4} /* borrow r4 */
|
2011-02-14 20:36:03 +01:00
|
|
|
|
|
|
|
|
/* blat 32 bytes at a time */
|
|
|
|
|
/* XXX for really big copies perhaps we should use more registers */
|
|
|
|
|
.Lmemmove_floop32:
|
|
|
|
|
ldmia r1!, {r3, r4, r12, lr}
|
|
|
|
|
stmia r0!, {r3, r4, r12, lr}
|
|
|
|
|
ldmia r1!, {r3, r4, r12, lr}
|
|
|
|
|
stmia r0!, {r3, r4, r12, lr}
|
|
|
|
|
subs r2, r2, #0x20
|
|
|
|
|
bge .Lmemmove_floop32
|
|
|
|
|
|
|
|
|
|
cmn r2, #0x10
|
2013-12-06 12:04:52 +01:00
|
|
|
ldmiage r1!, {r3, r4, r12, lr} /* blat a remaining 16 bytes */
|
|
|
|
|
stmiage r0!, {r3, r4, r12, lr}
|
2011-02-14 20:36:03 +01:00
|
|
|
subge r2, r2, #0x10
|
2013-12-06 12:04:52 +01:00
|
|
|
pop {r4} /* return r4 */
|
2011-02-14 20:36:03 +01:00
|
|
|
|
|
|
|
|
.Lmemmove_fl32:
|
|
|
|
|
adds r2, r2, #0x14
|
|
|
|
|
|
|
|
|
|
/* blat 12 bytes at a time */
|
|
|
|
|
.Lmemmove_floop12:
|
2013-12-06 12:04:52 +01:00
|
|
|
ldmiage r1!, {r3, r12, lr}
|
|
|
|
|
stmiage r0!, {r3, r12, lr}
|
|
|
|
|
subsge r2, r2, #0x0c
|
2011-02-14 20:36:03 +01:00
|
|
|
bge .Lmemmove_floop12
|
|
|
|
|
|
|
|
|
|
.Lmemmove_fl12:
|
|
|
|
|
adds r2, r2, #8
|
|
|
|
|
blt .Lmemmove_fl4
|
|
|
|
|
|
|
|
|
|
subs r2, r2, #4
|
|
|
|
|
ldrlt r3, [r1], #4
|
|
|
|
|
strlt r3, [r0], #4
|
2013-12-06 12:04:52 +01:00
|
|
|
ldmiage r1!, {r3, r12}
|
|
|
|
|
stmiage r0!, {r3, r12}
|
2011-02-14 20:36:03 +01:00
|
|
|
subge r2, r2, #4
|
|
|
|
|
|
|
|
|
|
.Lmemmove_fl4:
|
|
|
|
|
/* less than 4 bytes to go */
|
|
|
|
|
adds r2, r2, #4
|
2013-12-06 12:04:52 +01:00
|
|
|
popeq {r0, pc} /* done */
|
2011-02-14 20:36:03 +01:00
|
|
|
|
|
|
|
|
/* copy the crud byte at a time */
|
|
|
|
|
cmp r2, #2
|
|
|
|
|
ldrb r3, [r1], #1
|
|
|
|
|
strb r3, [r0], #1
|
2013-12-06 12:04:52 +01:00
|
|
|
ldrbge r3, [r1], #1
|
|
|
|
|
strbge r3, [r0], #1
|
|
|
|
|
ldrbgt r3, [r1], #1
|
|
|
|
|
strbgt r3, [r0], #1
|
|
|
|
|
pop {r0, pc}
|
2011-02-14 20:36:03 +01:00
|
|
|
|
|
|
|
|
/* erg - unaligned destination */
|
|
|
|
|
.Lmemmove_fdestul:
|
|
|
|
|
rsb r12, r12, #4
|
|
|
|
|
cmp r12, #2
|
|
|
|
|
|
|
|
|
|
/* align destination with byte copies */
|
|
|
|
|
ldrb r3, [r1], #1
|
|
|
|
|
strb r3, [r0], #1
|
2013-12-06 12:04:52 +01:00
|
|
|
ldrbge r3, [r1], #1
|
|
|
|
|
strbge r3, [r0], #1
|
|
|
|
|
ldrbgt r3, [r1], #1
|
|
|
|
|
strbgt r3, [r0], #1
|
2011-02-14 20:36:03 +01:00
|
|
|
subs r2, r2, r12
|
|
|
|
|
blt .Lmemmove_fl4 /* less the 4 bytes */
|
|
|
|
|
|
|
|
|
|
ands r12, r1, #3
|
|
|
|
|
beq .Lmemmove_ft8 /* we have an aligned source */
|
|
|
|
|
|
|
|
|
|
/* erg - unaligned source */
|
|
|
|
|
/* This is where it gets nasty ... */
|
|
|
|
|
.Lmemmove_fsrcul:
|
|
|
|
|
bic r1, r1, #3
|
|
|
|
|
ldr lr, [r1], #4
|
|
|
|
|
cmp r12, #2
|
|
|
|
|
bgt .Lmemmove_fsrcul3
|
|
|
|
|
beq .Lmemmove_fsrcul2
|
|
|
|
|
cmp r2, #0x0c
|
|
|
|
|
blt .Lmemmove_fsrcul1loop4
|
|
|
|
|
sub r2, r2, #0x0c
|
2013-12-06 12:04:52 +01:00
|
|
|
push {r4, r5}
|
2011-02-14 20:36:03 +01:00
|
|
|
|
|
|
|
|
.Lmemmove_fsrcul1loop16:
|
|
|
|
|
#ifdef __ARMEB__
|
|
|
|
|
mov r3, lr, lsl #8
|
|
|
|
|
#else
|
|
|
|
|
mov r3, lr, lsr #8
|
|
|
|
|
#endif
|
|
|
|
|
ldmia r1!, {r4, r5, r12, lr}
|
|
|
|
|
#ifdef __ARMEB__
|
|
|
|
|
orr r3, r3, r4, lsr #24
|
|
|
|
|
mov r4, r4, lsl #8
|
|
|
|
|
orr r4, r4, r5, lsr #24
|
|
|
|
|
mov r5, r5, lsl #8
|
|
|
|
|
orr r5, r5, r12, lsr #24
|
|
|
|
|
mov r12, r12, lsl #8
|
|
|
|
|
orr r12, r12, lr, lsr #24
|
|
|
|
|
#else
|
|
|
|
|
orr r3, r3, r4, lsl #24
|
|
|
|
|
mov r4, r4, lsr #8
|
|
|
|
|
orr r4, r4, r5, lsl #24
|
|
|
|
|
mov r5, r5, lsr #8
|
|
|
|
|
orr r5, r5, r12, lsl #24
|
|
|
|
|
mov r12, r12, lsr #8
|
|
|
|
|
orr r12, r12, lr, lsl #24
|
|
|
|
|
#endif
|
|
|
|
|
stmia r0!, {r3-r5, r12}
|
|
|
|
|
subs r2, r2, #0x10
|
|
|
|
|
bge .Lmemmove_fsrcul1loop16
|
2013-12-06 12:04:52 +01:00
|
|
|
pop {r4, r5}
|
2011-02-14 20:36:03 +01:00
|
|
|
adds r2, r2, #0x0c
|
|
|
|
|
blt .Lmemmove_fsrcul1l4
|
|
|
|
|
|
|
|
|
|
.Lmemmove_fsrcul1loop4:
|
|
|
|
|
#ifdef __ARMEB__
|
|
|
|
|
mov r12, lr, lsl #8
|
|
|
|
|
#else
|
|
|
|
|
mov r12, lr, lsr #8
|
|
|
|
|
#endif
|
|
|
|
|
ldr lr, [r1], #4
|
|
|
|
|
#ifdef __ARMEB__
|
|
|
|
|
orr r12, r12, lr, lsr #24
|
|
|
|
|
#else
|
|
|
|
|
orr r12, r12, lr, lsl #24
|
|
|
|
|
#endif
|
|
|
|
|
str r12, [r0], #4
|
|
|
|
|
subs r2, r2, #4
|
|
|
|
|
bge .Lmemmove_fsrcul1loop4
|
|
|
|
|
|
|
|
|
|
.Lmemmove_fsrcul1l4:
|
|
|
|
|
sub r1, r1, #3
|
|
|
|
|
b .Lmemmove_fl4
|
|
|
|
|
|
|
|
|
|
.Lmemmove_fsrcul2:
|
|
|
|
|
cmp r2, #0x0c
|
|
|
|
|
blt .Lmemmove_fsrcul2loop4
|
|
|
|
|
sub r2, r2, #0x0c
|
2013-12-06 12:04:52 +01:00
|
|
|
push {r4, r5}
|
2011-02-14 20:36:03 +01:00
|
|
|
|
|
|
|
|
.Lmemmove_fsrcul2loop16:
|
|
|
|
|
#ifdef __ARMEB__
|
|
|
|
|
mov r3, lr, lsl #16
|
|
|
|
|
#else
|
|
|
|
|
mov r3, lr, lsr #16
|
|
|
|
|
#endif
|
|
|
|
|
ldmia r1!, {r4, r5, r12, lr}
|
|
|
|
|
#ifdef __ARMEB__
|
|
|
|
|
orr r3, r3, r4, lsr #16
|
|
|
|
|
mov r4, r4, lsl #16
|
|
|
|
|
orr r4, r4, r5, lsr #16
|
|
|
|
|
mov r5, r5, lsl #16
|
|
|
|
|
orr r5, r5, r12, lsr #16
|
|
|
|
|
mov r12, r12, lsl #16
|
|
|
|
|
orr r12, r12, lr, lsr #16
|
|
|
|
|
#else
|
|
|
|
|
orr r3, r3, r4, lsl #16
|
|
|
|
|
mov r4, r4, lsr #16
|
|
|
|
|
orr r4, r4, r5, lsl #16
|
|
|
|
|
mov r5, r5, lsr #16
|
|
|
|
|
orr r5, r5, r12, lsl #16
|
|
|
|
|
mov r12, r12, lsr #16
|
|
|
|
|
orr r12, r12, lr, lsl #16
|
|
|
|
|
#endif
|
|
|
|
|
stmia r0!, {r3-r5, r12}
|
|
|
|
|
subs r2, r2, #0x10
|
|
|
|
|
bge .Lmemmove_fsrcul2loop16
|
2013-12-06 12:04:52 +01:00
|
|
|
pop {r4, r5}
|
2011-02-14 20:36:03 +01:00
|
|
|
adds r2, r2, #0x0c
|
|
|
|
|
blt .Lmemmove_fsrcul2l4
|
|
|
|
|
|
|
|
|
|
.Lmemmove_fsrcul2loop4:
|
|
|
|
|
#ifdef __ARMEB__
|
|
|
|
|
mov r12, lr, lsl #16
|
|
|
|
|
#else
|
|
|
|
|
mov r12, lr, lsr #16
|
|
|
|
|
#endif
|
|
|
|
|
ldr lr, [r1], #4
|
|
|
|
|
#ifdef __ARMEB__
|
|
|
|
|
orr r12, r12, lr, lsr #16
|
|
|
|
|
#else
|
|
|
|
|
orr r12, r12, lr, lsl #16
|
|
|
|
|
#endif
|
|
|
|
|
str r12, [r0], #4
|
|
|
|
|
subs r2, r2, #4
|
|
|
|
|
bge .Lmemmove_fsrcul2loop4
|
|
|
|
|
|
|
|
|
|
.Lmemmove_fsrcul2l4:
|
|
|
|
|
sub r1, r1, #2
|
|
|
|
|
b .Lmemmove_fl4
|
|
|
|
|
|
|
|
|
|
.Lmemmove_fsrcul3:
|
|
|
|
|
cmp r2, #0x0c
|
|
|
|
|
blt .Lmemmove_fsrcul3loop4
|
|
|
|
|
sub r2, r2, #0x0c
|
2013-12-06 12:04:52 +01:00
|
|
|
push {r4, r5}
|
2011-02-14 20:36:03 +01:00
|
|
|
|
|
|
|
|
.Lmemmove_fsrcul3loop16:
|
|
|
|
|
#ifdef __ARMEB__
|
|
|
|
|
mov r3, lr, lsl #24
|
|
|
|
|
#else
|
|
|
|
|
mov r3, lr, lsr #24
|
|
|
|
|
#endif
|
|
|
|
|
ldmia r1!, {r4, r5, r12, lr}
|
|
|
|
|
#ifdef __ARMEB__
|
|
|
|
|
orr r3, r3, r4, lsr #8
|
|
|
|
|
mov r4, r4, lsl #24
|
|
|
|
|
orr r4, r4, r5, lsr #8
|
|
|
|
|
mov r5, r5, lsl #24
|
|
|
|
|
orr r5, r5, r12, lsr #8
|
|
|
|
|
mov r12, r12, lsl #24
|
|
|
|
|
orr r12, r12, lr, lsr #8
|
|
|
|
|
#else
|
|
|
|
|
orr r3, r3, r4, lsl #8
|
|
|
|
|
mov r4, r4, lsr #24
|
|
|
|
|
orr r4, r4, r5, lsl #8
|
|
|
|
|
mov r5, r5, lsr #24
|
|
|
|
|
orr r5, r5, r12, lsl #8
|
|
|
|
|
mov r12, r12, lsr #24
|
|
|
|
|
orr r12, r12, lr, lsl #8
|
|
|
|
|
#endif
|
|
|
|
|
stmia r0!, {r3-r5, r12}
|
|
|
|
|
subs r2, r2, #0x10
|
|
|
|
|
bge .Lmemmove_fsrcul3loop16
|
2013-12-06 12:04:52 +01:00
|
|
|
pop {r4, r5}
|
2011-02-14 20:36:03 +01:00
|
|
|
adds r2, r2, #0x0c
|
|
|
|
|
blt .Lmemmove_fsrcul3l4
|
|
|
|
|
|
|
|
|
|
.Lmemmove_fsrcul3loop4:
|
|
|
|
|
#ifdef __ARMEB__
|
|
|
|
|
mov r12, lr, lsl #24
|
|
|
|
|
#else
|
|
|
|
|
mov r12, lr, lsr #24
|
|
|
|
|
#endif
|
|
|
|
|
ldr lr, [r1], #4
|
|
|
|
|
#ifdef __ARMEB__
|
|
|
|
|
orr r12, r12, lr, lsr #8
|
|
|
|
|
#else
|
|
|
|
|
orr r12, r12, lr, lsl #8
|
|
|
|
|
#endif
|
|
|
|
|
str r12, [r0], #4
|
|
|
|
|
subs r2, r2, #4
|
|
|
|
|
bge .Lmemmove_fsrcul3loop4
|
|
|
|
|
|
|
|
|
|
.Lmemmove_fsrcul3l4:
|
|
|
|
|
sub r1, r1, #1
|
|
|
|
|
b .Lmemmove_fl4
|
|
|
|
|
|
|
|
|
|
.Lmemmove_backwards:
|
|
|
|
|
add r1, r1, r2
|
|
|
|
|
add r0, r0, r2
|
|
|
|
|
subs r2, r2, #4
|
|
|
|
|
blt .Lmemmove_bl4 /* less than 4 bytes */
|
|
|
|
|
ands r12, r0, #3
|
|
|
|
|
bne .Lmemmove_bdestul /* oh unaligned destination addr */
|
|
|
|
|
ands r12, r1, #3
|
|
|
|
|
bne .Lmemmove_bsrcul /* oh unaligned source addr */
|
|
|
|
|
|
|
|
|
|
.Lmemmove_bt8:
|
|
|
|
|
/* We have aligned source and destination */
|
|
|
|
|
subs r2, r2, #8
|
|
|
|
|
blt .Lmemmove_bl12 /* less than 12 bytes (4 from above) */
|
2013-12-06 12:04:52 +01:00
|
|
|
push {r4, lr}
|
2011-02-14 20:36:03 +01:00
|
|
|
subs r2, r2, #0x14 /* less than 32 bytes (12 from above) */
|
|
|
|
|
blt .Lmemmove_bl32
|
|
|
|
|
|
|
|
|
|
/* blat 32 bytes at a time */
|
|
|
|
|
/* XXX for really big copies perhaps we should use more registers */
|
|
|
|
|
.Lmemmove_bloop32:
|
|
|
|
|
ldmdb r1!, {r3, r4, r12, lr}
|
|
|
|
|
stmdb r0!, {r3, r4, r12, lr}
|
|
|
|
|
ldmdb r1!, {r3, r4, r12, lr}
|
|
|
|
|
stmdb r0!, {r3, r4, r12, lr}
|
|
|
|
|
subs r2, r2, #0x20
|
|
|
|
|
bge .Lmemmove_bloop32
|
|
|
|
|
|
|
|
|
|
.Lmemmove_bl32:
|
|
|
|
|
cmn r2, #0x10
|
2013-12-06 12:04:52 +01:00
|
|
|
ldmdbge r1!, {r3, r4, r12, lr} /* blat a remaining 16 bytes */
|
|
|
|
|
stmdbge r0!, {r3, r4, r12, lr}
|
2011-02-14 20:36:03 +01:00
|
|
|
subge r2, r2, #0x10
|
|
|
|
|
adds r2, r2, #0x14
|
2013-12-06 12:04:52 +01:00
|
|
|
ldmdbge r1!, {r3, r12, lr} /* blat a remaining 12 bytes */
|
|
|
|
|
stmdbge r0!, {r3, r12, lr}
|
2011-02-14 20:36:03 +01:00
|
|
|
subge r2, r2, #0x0c
|
2013-12-06 12:04:52 +01:00
|
|
|
pop {r4, lr}
|
2011-02-14 20:36:03 +01:00
|
|
|
|
|
|
|
|
.Lmemmove_bl12:
|
|
|
|
|
adds r2, r2, #8
|
|
|
|
|
blt .Lmemmove_bl4
|
|
|
|
|
subs r2, r2, #4
|
|
|
|
|
ldrlt r3, [r1, #-4]!
|
|
|
|
|
strlt r3, [r0, #-4]!
|
2013-12-06 12:04:52 +01:00
|
|
|
ldmdbge r1!, {r3, r12}
|
|
|
|
|
stmdbge r0!, {r3, r12}
|
2011-02-14 20:36:03 +01:00
|
|
|
subge r2, r2, #4
|
|
|
|
|
|
|
|
|
|
.Lmemmove_bl4:
|
|
|
|
|
/* less than 4 bytes to go */
|
|
|
|
|
adds r2, r2, #4
|
|
|
|
|
RETc(eq)
|
|
|
|
|
|
|
|
|
|
/* copy the crud byte at a time */
|
|
|
|
|
cmp r2, #2
|
|
|
|
|
ldrb r3, [r1, #-1]!
|
|
|
|
|
strb r3, [r0, #-1]!
|
2013-12-06 12:04:52 +01:00
|
|
|
ldrbge r3, [r1, #-1]!
|
|
|
|
|
strbge r3, [r0, #-1]!
|
|
|
|
|
ldrbgt r3, [r1, #-1]!
|
|
|
|
|
strbgt r3, [r0, #-1]!
|
2011-02-14 20:36:03 +01:00
|
|
|
RET
|
|
|
|
|
|
|
|
|
|
/* erg - unaligned destination */
|
|
|
|
|
.Lmemmove_bdestul:
|
|
|
|
|
cmp r12, #2
|
|
|
|
|
|
|
|
|
|
/* align destination with byte copies */
|
|
|
|
|
ldrb r3, [r1, #-1]!
|
|
|
|
|
strb r3, [r0, #-1]!
|
2013-12-06 12:04:52 +01:00
|
|
|
ldrbge r3, [r1, #-1]!
|
|
|
|
|
strbge r3, [r0, #-1]!
|
|
|
|
|
ldrbgt r3, [r1, #-1]!
|
|
|
|
|
strbgt r3, [r0, #-1]!
|
2011-02-14 20:36:03 +01:00
|
|
|
subs r2, r2, r12
|
|
|
|
|
blt .Lmemmove_bl4 /* less than 4 bytes to go */
|
|
|
|
|
ands r12, r1, #3
|
|
|
|
|
beq .Lmemmove_bt8 /* we have an aligned source */
|
|
|
|
|
|
|
|
|
|
/* erg - unaligned source */
|
|
|
|
|
/* This is where it gets nasty ... */
|
|
|
|
|
.Lmemmove_bsrcul:
|
|
|
|
|
bic r1, r1, #3
|
|
|
|
|
ldr r3, [r1, #0]
|
|
|
|
|
cmp r12, #2
|
|
|
|
|
blt .Lmemmove_bsrcul1
|
|
|
|
|
beq .Lmemmove_bsrcul2
|
|
|
|
|
cmp r2, #0x0c
|
|
|
|
|
blt .Lmemmove_bsrcul3loop4
|
|
|
|
|
sub r2, r2, #0x0c
|
2013-12-06 12:04:52 +01:00
|
|
|
push {r4, r5, lr}
|
2011-02-14 20:36:03 +01:00
|
|
|
|
|
|
|
|
.Lmemmove_bsrcul3loop16:
|
|
|
|
|
#ifdef __ARMEB__
|
|
|
|
|
mov lr, r3, lsr #8
|
|
|
|
|
#else
|
|
|
|
|
mov lr, r3, lsl #8
|
|
|
|
|
#endif
|
|
|
|
|
ldmdb r1!, {r3-r5, r12}
|
|
|
|
|
#ifdef __ARMEB__
|
|
|
|
|
orr lr, lr, r12, lsl #24
|
|
|
|
|
mov r12, r12, lsr #8
|
|
|
|
|
orr r12, r12, r5, lsl #24
|
|
|
|
|
mov r5, r5, lsr #8
|
|
|
|
|
orr r5, r5, r4, lsl #24
|
|
|
|
|
mov r4, r4, lsr #8
|
|
|
|
|
orr r4, r4, r3, lsl #24
|
|
|
|
|
#else
|
|
|
|
|
orr lr, lr, r12, lsr #24
|
|
|
|
|
mov r12, r12, lsl #8
|
|
|
|
|
orr r12, r12, r5, lsr #24
|
|
|
|
|
mov r5, r5, lsl #8
|
|
|
|
|
orr r5, r5, r4, lsr #24
|
|
|
|
|
mov r4, r4, lsl #8
|
|
|
|
|
orr r4, r4, r3, lsr #24
|
|
|
|
|
#endif
|
|
|
|
|
stmdb r0!, {r4, r5, r12, lr}
|
|
|
|
|
subs r2, r2, #0x10
|
|
|
|
|
bge .Lmemmove_bsrcul3loop16
|
2013-12-06 12:04:52 +01:00
|
|
|
pop {r4, r5, lr}
|
2011-02-14 20:36:03 +01:00
|
|
|
adds r2, r2, #0x0c
|
|
|
|
|
blt .Lmemmove_bsrcul3l4
|
|
|
|
|
|
|
|
|
|
.Lmemmove_bsrcul3loop4:
|
|
|
|
|
#ifdef __ARMEB__
|
|
|
|
|
mov r12, r3, lsr #8
|
|
|
|
|
#else
|
|
|
|
|
mov r12, r3, lsl #8
|
|
|
|
|
#endif
|
|
|
|
|
ldr r3, [r1, #-4]!
|
|
|
|
|
#ifdef __ARMEB__
|
|
|
|
|
orr r12, r12, r3, lsl #24
|
|
|
|
|
#else
|
|
|
|
|
orr r12, r12, r3, lsr #24
|
|
|
|
|
#endif
|
|
|
|
|
str r12, [r0, #-4]!
|
|
|
|
|
subs r2, r2, #4
|
|
|
|
|
bge .Lmemmove_bsrcul3loop4
|
|
|
|
|
|
|
|
|
|
.Lmemmove_bsrcul3l4:
|
|
|
|
|
add r1, r1, #3
|
|
|
|
|
b .Lmemmove_bl4
|
|
|
|
|
|
|
|
|
|
.Lmemmove_bsrcul2:
|
|
|
|
|
cmp r2, #0x0c
|
|
|
|
|
blt .Lmemmove_bsrcul2loop4
|
|
|
|
|
sub r2, r2, #0x0c
|
2013-12-06 12:04:52 +01:00
|
|
|
push {r4, r5, lr}
|
2011-02-14 20:36:03 +01:00
|
|
|
|
|
|
|
|
.Lmemmove_bsrcul2loop16:
|
|
|
|
|
#ifdef __ARMEB__
|
|
|
|
|
mov lr, r3, lsr #16
|
|
|
|
|
#else
|
|
|
|
|
mov lr, r3, lsl #16
|
|
|
|
|
#endif
|
|
|
|
|
ldmdb r1!, {r3-r5, r12}
|
|
|
|
|
#ifdef __ARMEB__
|
|
|
|
|
orr lr, lr, r12, lsl #16
|
|
|
|
|
mov r12, r12, lsr #16
|
|
|
|
|
orr r12, r12, r5, lsl #16
|
|
|
|
|
mov r5, r5, lsr #16
|
|
|
|
|
orr r5, r5, r4, lsl #16
|
|
|
|
|
mov r4, r4, lsr #16
|
|
|
|
|
orr r4, r4, r3, lsl #16
|
|
|
|
|
#else
|
|
|
|
|
orr lr, lr, r12, lsr #16
|
|
|
|
|
mov r12, r12, lsl #16
|
|
|
|
|
orr r12, r12, r5, lsr #16
|
|
|
|
|
mov r5, r5, lsl #16
|
|
|
|
|
orr r5, r5, r4, lsr #16
|
|
|
|
|
mov r4, r4, lsl #16
|
|
|
|
|
orr r4, r4, r3, lsr #16
|
|
|
|
|
#endif
|
|
|
|
|
stmdb r0!, {r4, r5, r12, lr}
|
|
|
|
|
subs r2, r2, #0x10
|
|
|
|
|
bge .Lmemmove_bsrcul2loop16
|
2013-12-06 12:04:52 +01:00
|
|
|
pop {r4, r5, lr}
|
2011-02-14 20:36:03 +01:00
|
|
|
adds r2, r2, #0x0c
|
|
|
|
|
blt .Lmemmove_bsrcul2l4
|
|
|
|
|
|
|
|
|
|
.Lmemmove_bsrcul2loop4:
|
|
|
|
|
#ifdef __ARMEB__
|
|
|
|
|
mov r12, r3, lsr #16
|
|
|
|
|
#else
|
|
|
|
|
mov r12, r3, lsl #16
|
|
|
|
|
#endif
|
|
|
|
|
ldr r3, [r1, #-4]!
|
|
|
|
|
#ifdef __ARMEB__
|
|
|
|
|
orr r12, r12, r3, lsl #16
|
|
|
|
|
#else
|
|
|
|
|
orr r12, r12, r3, lsr #16
|
|
|
|
|
#endif
|
|
|
|
|
str r12, [r0, #-4]!
|
|
|
|
|
subs r2, r2, #4
|
|
|
|
|
bge .Lmemmove_bsrcul2loop4
|
|
|
|
|
|
|
|
|
|
.Lmemmove_bsrcul2l4:
|
|
|
|
|
add r1, r1, #2
|
|
|
|
|
b .Lmemmove_bl4
|
|
|
|
|
|
|
|
|
|
.Lmemmove_bsrcul1:
|
|
|
|
|
cmp r2, #0x0c
|
|
|
|
|
blt .Lmemmove_bsrcul1loop4
|
|
|
|
|
sub r2, r2, #0x0c
|
2013-12-06 12:04:52 +01:00
|
|
|
push {r4, r5, lr}
|
2011-02-14 20:36:03 +01:00
|
|
|
|
|
|
|
|
.Lmemmove_bsrcul1loop32:
|
|
|
|
|
#ifdef __ARMEB__
|
|
|
|
|
mov lr, r3, lsr #24
|
|
|
|
|
#else
|
|
|
|
|
mov lr, r3, lsl #24
|
|
|
|
|
#endif
|
|
|
|
|
ldmdb r1!, {r3-r5, r12}
|
|
|
|
|
#ifdef __ARMEB__
|
|
|
|
|
orr lr, lr, r12, lsl #8
|
|
|
|
|
mov r12, r12, lsr #24
|
|
|
|
|
orr r12, r12, r5, lsl #8
|
|
|
|
|
mov r5, r5, lsr #24
|
|
|
|
|
orr r5, r5, r4, lsl #8
|
|
|
|
|
mov r4, r4, lsr #24
|
|
|
|
|
orr r4, r4, r3, lsl #8
|
|
|
|
|
#else
|
|
|
|
|
orr lr, lr, r12, lsr #8
|
|
|
|
|
mov r12, r12, lsl #24
|
|
|
|
|
orr r12, r12, r5, lsr #8
|
|
|
|
|
mov r5, r5, lsl #24
|
|
|
|
|
orr r5, r5, r4, lsr #8
|
|
|
|
|
mov r4, r4, lsl #24
|
|
|
|
|
orr r4, r4, r3, lsr #8
|
|
|
|
|
#endif
|
|
|
|
|
stmdb r0!, {r4, r5, r12, lr}
|
|
|
|
|
subs r2, r2, #0x10
|
|
|
|
|
bge .Lmemmove_bsrcul1loop32
|
2013-12-06 12:04:52 +01:00
|
|
|
pop {r4, r5, lr}
|
2011-02-14 20:36:03 +01:00
|
|
|
adds r2, r2, #0x0c
|
|
|
|
|
blt .Lmemmove_bsrcul1l4
|
|
|
|
|
|
|
|
|
|
.Lmemmove_bsrcul1loop4:
|
|
|
|
|
#ifdef __ARMEB__
|
|
|
|
|
mov r12, r3, lsr #24
|
|
|
|
|
#else
|
|
|
|
|
mov r12, r3, lsl #24
|
|
|
|
|
#endif
|
|
|
|
|
ldr r3, [r1, #-4]!
|
|
|
|
|
#ifdef __ARMEB__
|
|
|
|
|
orr r12, r12, r3, lsl #8
|
|
|
|
|
#else
|
|
|
|
|
orr r12, r12, r3, lsr #8
|
|
|
|
|
#endif
|
|
|
|
|
str r12, [r0, #-4]!
|
|
|
|
|
subs r2, r2, #4
|
|
|
|
|
bge .Lmemmove_bsrcul1loop4
|
|
|
|
|
|
|
|
|
|
.Lmemmove_bsrcul1l4:
|
|
|
|
|
add r1, r1, #1
|
|
|
|
|
b .Lmemmove_bl4
|
2013-12-06 12:04:52 +01:00
|
|
|
#ifndef _BCOPY
|
|
|
|
|
END(memmove)
|
|
|
|
|
#else
|
|
|
|
|
END(bcopy)
|
|
|
|
|
#endif
|
|
|
|
|
|
|
|
|
|
#if defined(__ARM_EABI__) && !defined(BCOPY)
|
|
|
|
|
STRONG_ALIAS(__aeabi_memmove, memmove)
|
|
|
|
|
#endif
|
