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memcpymove-v6l.S
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memcpymove-v6l.S
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/*
Copyright (c) 2013, Raspberry Pi Foundation
Copyright (c) 2013, RISC OS Open Ltd
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* 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.
* Neither the name of the copyright holder nor the
names of its contributors may be used to endorse or promote products
derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT HOLDER 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 "arm-mem.h"
/* Prevent the stack from becoming executable */
#if defined(__linux__) && defined(__ELF__)
.section .note.GNU-stack,"",%progbits
#endif
.text
.arch armv6
.object_arch armv4
.arm
.altmacro
.p2align 2
.macro unaligned_words backwards, align, use_pld, words, r0, r1, r2, r3, r4, r5, r6, r7, r8
.if words == 1
.if backwards
mov r1, r0, lsl #32-align*8
ldr r0, [S, #-4]!
orr r1, r1, r0, lsr #align*8
str r1, [D, #-4]!
.else
mov r0, r1, lsr #align*8
ldr r1, [S, #4]!
orr r0, r0, r1, lsl #32-align*8
str r0, [D], #4
.endif
.elseif words == 2
.if backwards
ldr r1, [S, #-4]!
mov r2, r0, lsl #32-align*8
ldr r0, [S, #-4]!
orr r2, r2, r1, lsr #align*8
mov r1, r1, lsl #32-align*8
orr r1, r1, r0, lsr #align*8
stmdb D!, {r1, r2}
.else
ldr r1, [S, #4]!
mov r0, r2, lsr #align*8
ldr r2, [S, #4]!
orr r0, r0, r1, lsl #32-align*8
mov r1, r1, lsr #align*8
orr r1, r1, r2, lsl #32-align*8
stmia D!, {r0, r1}
.endif
.elseif words == 4
.if backwards
ldmdb S!, {r2, r3}
mov r4, r0, lsl #32-align*8
ldmdb S!, {r0, r1}
orr r4, r4, r3, lsr #align*8
mov r3, r3, lsl #32-align*8
orr r3, r3, r2, lsr #align*8
mov r2, r2, lsl #32-align*8
orr r2, r2, r1, lsr #align*8
mov r1, r1, lsl #32-align*8
orr r1, r1, r0, lsr #align*8
stmdb D!, {r1, r2, r3, r4}
.else
ldmib S!, {r1, r2}
mov r0, r4, lsr #align*8
ldmib S!, {r3, r4}
orr r0, r0, r1, lsl #32-align*8
mov r1, r1, lsr #align*8
orr r1, r1, r2, lsl #32-align*8
mov r2, r2, lsr #align*8
orr r2, r2, r3, lsl #32-align*8
mov r3, r3, lsr #align*8
orr r3, r3, r4, lsl #32-align*8
stmia D!, {r0, r1, r2, r3}
.endif
.elseif words == 8
.if backwards
ldmdb S!, {r4, r5, r6, r7}
mov r8, r0, lsl #32-align*8
ldmdb S!, {r0, r1, r2, r3}
.if use_pld
pld [S, OFF]
.endif
orr r8, r8, r7, lsr #align*8
mov r7, r7, lsl #32-align*8
orr r7, r7, r6, lsr #align*8
mov r6, r6, lsl #32-align*8
orr r6, r6, r5, lsr #align*8
mov r5, r5, lsl #32-align*8
orr r5, r5, r4, lsr #align*8
mov r4, r4, lsl #32-align*8
orr r4, r4, r3, lsr #align*8
mov r3, r3, lsl #32-align*8
orr r3, r3, r2, lsr #align*8
mov r2, r2, lsl #32-align*8
orr r2, r2, r1, lsr #align*8
mov r1, r1, lsl #32-align*8
orr r1, r1, r0, lsr #align*8
stmdb D!, {r5, r6, r7, r8}
stmdb D!, {r1, r2, r3, r4}
.else
ldmib S!, {r1, r2, r3, r4}
mov r0, r8, lsr #align*8
ldmib S!, {r5, r6, r7, r8}
.if use_pld
pld [S, OFF]
.endif
orr r0, r0, r1, lsl #32-align*8
mov r1, r1, lsr #align*8
orr r1, r1, r2, lsl #32-align*8
mov r2, r2, lsr #align*8
orr r2, r2, r3, lsl #32-align*8
mov r3, r3, lsr #align*8
orr r3, r3, r4, lsl #32-align*8
mov r4, r4, lsr #align*8
orr r4, r4, r5, lsl #32-align*8
mov r5, r5, lsr #align*8
orr r5, r5, r6, lsl #32-align*8
mov r6, r6, lsr #align*8
orr r6, r6, r7, lsl #32-align*8
mov r7, r7, lsr #align*8
orr r7, r7, r8, lsl #32-align*8
stmia D!, {r0, r1, r2, r3}
stmia D!, {r4, r5, r6, r7}
.endif
.endif
.endm
.macro memcpy_leading_15bytes backwards, align
movs DAT1, DAT2, lsl #31
sub N, N, DAT2
.if backwards
ldrmib DAT0, [S, #-1]!
ldrcsh DAT1, [S, #-2]!
strmib DAT0, [D, #-1]!
strcsh DAT1, [D, #-2]!
.else
ldrmib DAT0, [S], #1
ldrcsh DAT1, [S], #2
strmib DAT0, [D], #1
strcsh DAT1, [D], #2
.endif
movs DAT1, DAT2, lsl #29
.if backwards
ldrmi DAT0, [S, #-4]!
.if align == 0
ldmcsdb S!, {DAT1, DAT2}
.else
ldrcs DAT2, [S, #-4]!
ldrcs DAT1, [S, #-4]!
.endif
strmi DAT0, [D, #-4]!
stmcsdb D!, {DAT1, DAT2}
.else
ldrmi DAT0, [S], #4
.if align == 0
ldmcsia S!, {DAT1, DAT2}
.else
ldrcs DAT1, [S], #4
ldrcs DAT2, [S], #4
.endif
strmi DAT0, [D], #4
stmcsia D!, {DAT1, DAT2}
.endif
.endm
.macro memcpy_trailing_15bytes backwards, align
movs N, N, lsl #29
.if backwards
.if align == 0
ldmcsdb S!, {DAT0, DAT1}
.else
ldrcs DAT1, [S, #-4]!
ldrcs DAT0, [S, #-4]!
.endif
ldrmi DAT2, [S, #-4]!
stmcsdb D!, {DAT0, DAT1}
strmi DAT2, [D, #-4]!
.else
.if align == 0
ldmcsia S!, {DAT0, DAT1}
.else
ldrcs DAT0, [S], #4
ldrcs DAT1, [S], #4
.endif
ldrmi DAT2, [S], #4
stmcsia D!, {DAT0, DAT1}
strmi DAT2, [D], #4
.endif
movs N, N, lsl #2
.if backwards
ldrcsh DAT0, [S, #-2]!
ldrmib DAT1, [S, #-1]
strcsh DAT0, [D, #-2]!
strmib DAT1, [D, #-1]
.else
ldrcsh DAT0, [S], #2
ldrmib DAT1, [S]
strcsh DAT0, [D], #2
strmib DAT1, [D]
.endif
.endm
.macro memcpy_long_inner_loop backwards, align
.if align != 0
.if backwards
ldr DAT0, [S, #-align]!
.else
ldr LAST, [S, #-align]!
.endif
.endif
110:
.if align == 0
.if backwards
ldmdb S!, {DAT0, DAT1, DAT2, DAT3, DAT4, DAT5, DAT6, LAST}
pld [S, OFF]
stmdb D!, {DAT4, DAT5, DAT6, LAST}
stmdb D!, {DAT0, DAT1, DAT2, DAT3}
.else
ldmia S!, {DAT0, DAT1, DAT2, DAT3, DAT4, DAT5, DAT6, LAST}
pld [S, OFF]
stmia D!, {DAT0, DAT1, DAT2, DAT3}
stmia D!, {DAT4, DAT5, DAT6, LAST}
.endif
.else
unaligned_words backwards, align, 1, 8, DAT0, DAT1, DAT2, DAT3, DAT4, DAT5, DAT6, DAT7, LAST
.endif
subs N, N, #32
bhs 110b
/* Just before the final (prefetch_distance+1) 32-byte blocks, deal with final preloads */
preload_trailing backwards, S, 5, N, OFF
add N, N, #(prefetch_distance+2)*32 - 32
120:
.if align == 0
.if backwards
ldmdb S!, {DAT0, DAT1, DAT2, DAT3, DAT4, DAT5, DAT6, LAST}
stmdb D!, {DAT4, DAT5, DAT6, LAST}
stmdb D!, {DAT0, DAT1, DAT2, DAT3}
.else
ldmia S!, {DAT0, DAT1, DAT2, DAT3, DAT4, DAT5, DAT6, LAST}
stmia D!, {DAT0, DAT1, DAT2, DAT3}
stmia D!, {DAT4, DAT5, DAT6, LAST}
.endif
.else
unaligned_words backwards, align, 0, 8, DAT0, DAT1, DAT2, DAT3, DAT4, DAT5, DAT6, DAT7, LAST
.endif
subs N, N, #32
bhs 120b
tst N, #16
.if align == 0
.if backwards
ldmnedb S!, {DAT0, DAT1, DAT2, LAST}
stmnedb D!, {DAT0, DAT1, DAT2, LAST}
.else
ldmneia S!, {DAT0, DAT1, DAT2, LAST}
stmneia D!, {DAT0, DAT1, DAT2, LAST}
.endif
.else
beq 130f
unaligned_words backwards, align, 0, 4, DAT0, DAT1, DAT2, DAT3, LAST
130:
.endif
/* Trailing words and bytes */
tst N, #15
beq 199f
.if align != 0
add S, S, #align
.endif
memcpy_trailing_15bytes backwards, align
199:
pop {DAT3, DAT4, DAT5, DAT6, DAT7}
pop {D, DAT1, DAT2, pc}
.endm
.macro memcpy_medium_inner_loop backwards, align
120:
.if backwards
.if align == 0
ldmdb S!, {DAT0, DAT1, DAT2, LAST}
.else
ldr LAST, [S, #-4]!
ldr DAT2, [S, #-4]!
ldr DAT1, [S, #-4]!
ldr DAT0, [S, #-4]!
.endif
stmdb D!, {DAT0, DAT1, DAT2, LAST}
.else
.if align == 0
ldmia S!, {DAT0, DAT1, DAT2, LAST}
.else
ldr DAT0, [S], #4
ldr DAT1, [S], #4
ldr DAT2, [S], #4
ldr LAST, [S], #4
.endif
stmia D!, {DAT0, DAT1, DAT2, LAST}
.endif
subs N, N, #16
bhs 120b
/* Trailing words and bytes */
tst N, #15
beq 199f
memcpy_trailing_15bytes backwards, align
199:
pop {D, DAT1, DAT2, pc}
.endm
.macro memcpy_short_inner_loop backwards, align
tst N, #16
.if backwards
.if align == 0
ldmnedb S!, {DAT0, DAT1, DAT2, LAST}
.else
ldrne LAST, [S, #-4]!
ldrne DAT2, [S, #-4]!
ldrne DAT1, [S, #-4]!
ldrne DAT0, [S, #-4]!
.endif
stmnedb D!, {DAT0, DAT1, DAT2, LAST}
.else
.if align == 0
ldmneia S!, {DAT0, DAT1, DAT2, LAST}
.else
ldrne DAT0, [S], #4
ldrne DAT1, [S], #4
ldrne DAT2, [S], #4
ldrne LAST, [S], #4
.endif
stmneia D!, {DAT0, DAT1, DAT2, LAST}
.endif
memcpy_trailing_15bytes backwards, align
199:
pop {D, DAT1, DAT2, pc}
.endm
.macro memcpy backwards
D .req a1
S .req a2
N .req a3
DAT0 .req a4
DAT1 .req v1
DAT2 .req v2
DAT3 .req v3
DAT4 .req v4
DAT5 .req v5
DAT6 .req v6
DAT7 .req sl
LAST .req ip
OFF .req lr
.cfi_startproc
push {D, DAT1, DAT2, lr}
.cfi_def_cfa_offset 16
.cfi_rel_offset D, 0
.cfi_undefined S
.cfi_undefined N
.cfi_undefined DAT0
.cfi_rel_offset DAT1, 4
.cfi_rel_offset DAT2, 8
.cfi_undefined LAST
.cfi_rel_offset lr, 12
.if backwards
add D, D, N
add S, S, N
.endif
/* See if we're guaranteed to have at least one 16-byte aligned 16-byte write */
cmp N, #31
blo 170f
/* To preload ahead as we go, we need at least (prefetch_distance+2) 32-byte blocks */
cmp N, #(prefetch_distance+3)*32 - 1
blo 160f
/* Long case */
push {DAT3, DAT4, DAT5, DAT6, DAT7}
.cfi_def_cfa_offset 36
.cfi_rel_offset D, 20
.cfi_rel_offset DAT1, 24
.cfi_rel_offset DAT2, 28
.cfi_rel_offset DAT3, 0
.cfi_rel_offset DAT4, 4
.cfi_rel_offset DAT5, 8
.cfi_rel_offset DAT6, 12
.cfi_rel_offset DAT7, 16
.cfi_rel_offset lr, 32
/* Adjust N so that the decrement instruction can also test for
* inner loop termination. We want it to stop when there are
* (prefetch_distance+1) complete blocks to go. */
sub N, N, #(prefetch_distance+2)*32
preload_leading_step1 backwards, DAT0, S, 5
.if backwards
/* Bug in GAS: it accepts, but mis-assembles the instruction
* ands DAT2, D, #60, 2
* which sets DAT2 to the number of leading bytes until destination is aligned and also clears C (sets borrow)
*/
.word 0xE210513C
beq 154f
.else
ands DAT2, D, #15
beq 154f
rsb DAT2, DAT2, #16 /* number of leading bytes until destination aligned */
.endif
preload_leading_step2 backwards, DAT0, S, 5, DAT2, OFF
memcpy_leading_15bytes backwards, 1
154: /* Destination now 16-byte aligned; we have at least one prefetch as well as at least one 16-byte output block */
/* Prefetch offset is best selected such that it lies in the first 8 of each 32 bytes - but it's just as easy to aim for the first one */
.if backwards
rsb OFF, S, #3
and OFF, OFF, #28
sub OFF, OFF, #32*(prefetch_distance+1)
.else
and OFF, S, #28
rsb OFF, OFF, #32*prefetch_distance
.endif
movs DAT0, S, lsl #31
bhi 157f
bcs 156f
bmi 155f
memcpy_long_inner_loop backwards, 0
155: memcpy_long_inner_loop backwards, 1
156: memcpy_long_inner_loop backwards, 2
157: memcpy_long_inner_loop backwards, 3
.cfi_def_cfa_offset 16
.cfi_rel_offset D, 0
.cfi_rel_offset DAT1, 4
.cfi_rel_offset DAT2, 8
.cfi_same_value DAT3
.cfi_same_value DAT4
.cfi_same_value DAT5
.cfi_same_value DAT6
.cfi_same_value DAT7
.cfi_rel_offset lr, 12
160: /* Medium case */
preload_all backwards, 0, 0, S, 5, N, DAT2, OFF
sub N, N, #16 /* simplifies inner loop termination */
.if backwards
ands DAT2, D, #15
beq 164f
.else
ands DAT2, D, #15
beq 164f
rsb DAT2, DAT2, #16
.endif
memcpy_leading_15bytes backwards, align
164: /* Destination now 16-byte aligned; we have at least one 16-byte output block */
tst S, #3
bne 140f
memcpy_medium_inner_loop backwards, 0
140: memcpy_medium_inner_loop backwards, 1
170: /* Short case, less than 31 bytes, so no guarantee of at least one 16-byte block */
teq N, #0
beq 199f
preload_all backwards, 1, 0, S, 5, N, DAT2, LAST
tst D, #3
beq 174f
172: subs N, N, #1
blo 199f
.if backwards
ldrb DAT0, [S, #-1]!
strb DAT0, [D, #-1]!
.else
ldrb DAT0, [S], #1
strb DAT0, [D], #1
.endif
tst D, #3
bne 172b
174: /* Destination now 4-byte aligned; we have 0 or more output bytes to go */
tst S, #3
bne 140f
memcpy_short_inner_loop backwards, 0
140: memcpy_short_inner_loop backwards, 1
.cfi_endproc
.unreq D
.unreq S
.unreq N
.unreq DAT0
.unreq DAT1
.unreq DAT2
.unreq DAT3
.unreq DAT4
.unreq DAT5
.unreq DAT6
.unreq DAT7
.unreq LAST
.unreq OFF
.endm
/*
* void *memcpy(void * restrict s1, const void * restrict s2, size_t n);
* On entry:
* a1 = pointer to destination
* a2 = pointer to source
* a3 = number of bytes to copy
* On exit:
* a1 preserved
*/
.set prefetch_distance, 3
myfunc memcpy
1000: memcpy 0
.size memcpy,.-memcpy
.endfunc
/*
* void *memmove(void *s1, const void *s2, size_t n);
* On entry:
* a1 = pointer to destination
* a2 = pointer to source
* a3 = number of bytes to copy
* On exit:
* a1 preserved
*/
.set prefetch_distance, 3
myfunc memmove
cmp a2, a1
bpl 1000b /* pl works even over -1 - 0 and 0x7fffffff - 0x80000000 boundaries */
memcpy 1
.size memmove,.-memmove
.endfunc
/*
* void *mempcpy(void * restrict s1, const void * restrict s2, size_t n);
* On entry:
* a1 = pointer to destination
* a2 = pointer to source
* a3 = number of bytes to copy
* On exit:
* a1 = pointer to immediately after destination block
*/
myfunc mempcpy
.global __mempcpy
.type __mempcpy STT_FUNC
__mempcpy:
push {v1, lr}
mov v1, a3
bl 1000b
add a1, a1, v1
pop {v1, pc}
.size mempcpy,.-mempcpy
.size __mempcpy,.-__mempcpy