mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-17 09:43:59 +08:00
3ac0f4526d
In an effort to clarify and simplify the annotation of assembly functions in the kernel new macros have been introduced. These replace ENTRY and ENDPROC and also add a new annotation for static functions which previously had no ENTRY equivalent. Update the annotations in the library code to the new macros. Signed-off-by: Mark Brown <broonie@kernel.org> [will: Use SYM_FUNC_START_WEAK_PI] Signed-off-by: Will Deacon <will@kernel.org>
191 lines
3.8 KiB
ArmAsm
191 lines
3.8 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-only */
|
|
/*
|
|
* Copyright (C) 2013 ARM Ltd.
|
|
* Copyright (C) 2013 Linaro.
|
|
*
|
|
* This code is based on glibc cortex strings work originally authored by Linaro
|
|
* be found @
|
|
*
|
|
* http://bazaar.launchpad.net/~linaro-toolchain-dev/cortex-strings/trunk/
|
|
* files/head:/src/aarch64/
|
|
*/
|
|
|
|
#include <linux/linkage.h>
|
|
#include <asm/assembler.h>
|
|
#include <asm/cache.h>
|
|
|
|
/*
|
|
* Move a buffer from src to test (alignment handled by the hardware).
|
|
* If dest <= src, call memcpy, otherwise copy in reverse order.
|
|
*
|
|
* Parameters:
|
|
* x0 - dest
|
|
* x1 - src
|
|
* x2 - n
|
|
* Returns:
|
|
* x0 - dest
|
|
*/
|
|
dstin .req x0
|
|
src .req x1
|
|
count .req x2
|
|
tmp1 .req x3
|
|
tmp1w .req w3
|
|
tmp2 .req x4
|
|
tmp2w .req w4
|
|
tmp3 .req x5
|
|
tmp3w .req w5
|
|
dst .req x6
|
|
|
|
A_l .req x7
|
|
A_h .req x8
|
|
B_l .req x9
|
|
B_h .req x10
|
|
C_l .req x11
|
|
C_h .req x12
|
|
D_l .req x13
|
|
D_h .req x14
|
|
|
|
.weak memmove
|
|
SYM_FUNC_START_ALIAS(__memmove)
|
|
SYM_FUNC_START_PI(memmove)
|
|
cmp dstin, src
|
|
b.lo __memcpy
|
|
add tmp1, src, count
|
|
cmp dstin, tmp1
|
|
b.hs __memcpy /* No overlap. */
|
|
|
|
add dst, dstin, count
|
|
add src, src, count
|
|
cmp count, #16
|
|
b.lo .Ltail15 /*probably non-alignment accesses.*/
|
|
|
|
ands tmp2, src, #15 /* Bytes to reach alignment. */
|
|
b.eq .LSrcAligned
|
|
sub count, count, tmp2
|
|
/*
|
|
* process the aligned offset length to make the src aligned firstly.
|
|
* those extra instructions' cost is acceptable. It also make the
|
|
* coming accesses are based on aligned address.
|
|
*/
|
|
tbz tmp2, #0, 1f
|
|
ldrb tmp1w, [src, #-1]!
|
|
strb tmp1w, [dst, #-1]!
|
|
1:
|
|
tbz tmp2, #1, 2f
|
|
ldrh tmp1w, [src, #-2]!
|
|
strh tmp1w, [dst, #-2]!
|
|
2:
|
|
tbz tmp2, #2, 3f
|
|
ldr tmp1w, [src, #-4]!
|
|
str tmp1w, [dst, #-4]!
|
|
3:
|
|
tbz tmp2, #3, .LSrcAligned
|
|
ldr tmp1, [src, #-8]!
|
|
str tmp1, [dst, #-8]!
|
|
|
|
.LSrcAligned:
|
|
cmp count, #64
|
|
b.ge .Lcpy_over64
|
|
|
|
/*
|
|
* Deal with small copies quickly by dropping straight into the
|
|
* exit block.
|
|
*/
|
|
.Ltail63:
|
|
/*
|
|
* Copy up to 48 bytes of data. At this point we only need the
|
|
* bottom 6 bits of count to be accurate.
|
|
*/
|
|
ands tmp1, count, #0x30
|
|
b.eq .Ltail15
|
|
cmp tmp1w, #0x20
|
|
b.eq 1f
|
|
b.lt 2f
|
|
ldp A_l, A_h, [src, #-16]!
|
|
stp A_l, A_h, [dst, #-16]!
|
|
1:
|
|
ldp A_l, A_h, [src, #-16]!
|
|
stp A_l, A_h, [dst, #-16]!
|
|
2:
|
|
ldp A_l, A_h, [src, #-16]!
|
|
stp A_l, A_h, [dst, #-16]!
|
|
|
|
.Ltail15:
|
|
tbz count, #3, 1f
|
|
ldr tmp1, [src, #-8]!
|
|
str tmp1, [dst, #-8]!
|
|
1:
|
|
tbz count, #2, 2f
|
|
ldr tmp1w, [src, #-4]!
|
|
str tmp1w, [dst, #-4]!
|
|
2:
|
|
tbz count, #1, 3f
|
|
ldrh tmp1w, [src, #-2]!
|
|
strh tmp1w, [dst, #-2]!
|
|
3:
|
|
tbz count, #0, .Lexitfunc
|
|
ldrb tmp1w, [src, #-1]
|
|
strb tmp1w, [dst, #-1]
|
|
|
|
.Lexitfunc:
|
|
ret
|
|
|
|
.Lcpy_over64:
|
|
subs count, count, #128
|
|
b.ge .Lcpy_body_large
|
|
/*
|
|
* Less than 128 bytes to copy, so handle 64 bytes here and then jump
|
|
* to the tail.
|
|
*/
|
|
ldp A_l, A_h, [src, #-16]
|
|
stp A_l, A_h, [dst, #-16]
|
|
ldp B_l, B_h, [src, #-32]
|
|
ldp C_l, C_h, [src, #-48]
|
|
stp B_l, B_h, [dst, #-32]
|
|
stp C_l, C_h, [dst, #-48]
|
|
ldp D_l, D_h, [src, #-64]!
|
|
stp D_l, D_h, [dst, #-64]!
|
|
|
|
tst count, #0x3f
|
|
b.ne .Ltail63
|
|
ret
|
|
|
|
/*
|
|
* Critical loop. Start at a new cache line boundary. Assuming
|
|
* 64 bytes per line this ensures the entire loop is in one line.
|
|
*/
|
|
.p2align L1_CACHE_SHIFT
|
|
.Lcpy_body_large:
|
|
/* pre-load 64 bytes data. */
|
|
ldp A_l, A_h, [src, #-16]
|
|
ldp B_l, B_h, [src, #-32]
|
|
ldp C_l, C_h, [src, #-48]
|
|
ldp D_l, D_h, [src, #-64]!
|
|
1:
|
|
/*
|
|
* interlace the load of next 64 bytes data block with store of the last
|
|
* loaded 64 bytes data.
|
|
*/
|
|
stp A_l, A_h, [dst, #-16]
|
|
ldp A_l, A_h, [src, #-16]
|
|
stp B_l, B_h, [dst, #-32]
|
|
ldp B_l, B_h, [src, #-32]
|
|
stp C_l, C_h, [dst, #-48]
|
|
ldp C_l, C_h, [src, #-48]
|
|
stp D_l, D_h, [dst, #-64]!
|
|
ldp D_l, D_h, [src, #-64]!
|
|
subs count, count, #64
|
|
b.ge 1b
|
|
stp A_l, A_h, [dst, #-16]
|
|
stp B_l, B_h, [dst, #-32]
|
|
stp C_l, C_h, [dst, #-48]
|
|
stp D_l, D_h, [dst, #-64]!
|
|
|
|
tst count, #0x3f
|
|
b.ne .Ltail63
|
|
ret
|
|
SYM_FUNC_END_PI(memmove)
|
|
EXPORT_SYMBOL(memmove)
|
|
SYM_FUNC_END_ALIAS(__memmove)
|
|
EXPORT_SYMBOL(__memmove)
|