Until now there has been no assembler optimized version of memmove() for
ARM. Add this from Linux-6.10 for both ARM32 and ARM64. This also updates
memcpy() for ARM64 from Linux-6.10.
Reviewed-by: Ahmad Fatoum <a.fatoum@xxxxxxxxxxxxxx>
Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
---
arch/arm/include/asm/cache.h | 8 ++
arch/arm/include/asm/string.h | 4 +-
arch/arm/lib32/Makefile | 1 +
arch/arm/lib32/memmove.S | 206 +++++++++++++++++++++++++++++++
arch/arm/lib64/copy_template.S | 180 ---------------------------
arch/arm/lib64/memcpy.S | 274 ++++++++++++++++++++++++++++++++++-------
arch/arm/lib64/memset.S | 18 +--
arch/arm/lib64/string.c | 17 +++
include/string.h | 2 +
lib/string.c | 1 -
10 files changed, 478 insertions(+), 233 deletions(-)
diff --git a/arch/arm/include/asm/cache.h b/arch/arm/include/asm/cache.h
index 261c30129a..dd022c1f23 100644
--- a/arch/arm/include/asm/cache.h
+++ b/arch/arm/include/asm/cache.h
@@ -3,6 +3,13 @@
#ifndef __ASM_CACHE_H
#define __ASM_CACHE_H
+#ifdef CONFIG_CPU_64
+#define L1_CACHE_SHIFT (6)
+#define L1_CACHE_BYTES (1 << L1_CACHE_SHIFT)
+#endif
+
+#ifndef __ASSEMBLY__
+
void v8_invalidate_icache_all(void);
void v8_flush_dcache_all(void);
void v8_invalidate_dcache_all(void);
@@ -25,5 +32,6 @@ void arm_early_mmu_cache_invalidate(void);
void sync_caches_for_execution(void);
#include <asm-generic/cache.h>
+#endif
#endif
diff --git a/arch/arm/include/asm/string.h b/arch/arm/include/asm/string.h
index 2322b846b2..f79392e53d 100644
--- a/arch/arm/include/asm/string.h
+++ b/arch/arm/include/asm/string.h
@@ -9,10 +9,12 @@
extern void *memcpy(void *, const void *, __kernel_size_t);
#define __HAVE_ARCH_MEMSET
extern void *memset(void *, int, __kernel_size_t);
-
+#define __HAVE_ARCH_MEMMOVE
+extern void *memmove(void *, const void *, __kernel_size_t);
#endif
extern void *__memcpy(void *, const void *, __kernel_size_t);
extern void *__memset(void *, int, __kernel_size_t);
+extern void *__memmove(void *, const void *, __kernel_size_t);
#endif
diff --git a/arch/arm/lib32/Makefile b/arch/arm/lib32/Makefile
index 511a029062..a139a80fb8 100644
--- a/arch/arm/lib32/Makefile
+++ b/arch/arm/lib32/Makefile
@@ -21,6 +21,7 @@ obj-y += lshrdi3.o
obj-y += runtime-offset.o
pbl-y += runtime-offset.o
obj-$(CONFIG_ARM_OPTIMZED_STRING_FUNCTIONS) += memcpy.o
+obj-$(CONFIG_ARM_OPTIMZED_STRING_FUNCTIONS) += memmove.o
obj-$(CONFIG_ARM_OPTIMZED_STRING_FUNCTIONS) += memset.o
obj-$(CONFIG_ARM_UNWIND) += unwind.o
obj-$(CONFIG_MODULES) += module.o
diff --git a/arch/arm/lib32/memmove.S b/arch/arm/lib32/memmove.S
new file mode 100644
index 0000000000..6410554039
--- /dev/null
+++ b/arch/arm/lib32/memmove.S
@@ -0,0 +1,206 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * linux/arch/arm/lib/memmove.S
+ *
+ * Author: Nicolas Pitre
+ * Created: Sep 28, 2005
+ * Copyright: (C) MontaVista Software Inc.
+ */
+
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+#include <asm/unwind.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)
+WEAK(memmove)
+ UNWIND( .fnstart )
+
+ subs ip, r0, r1
+ cmphi r2, ip
+ bls __memcpy
+ UNWIND( .fnend )
+
+ UNWIND( .fnstart )
+ UNWIND( .save {r0, r4, fpreg, lr} )
+ stmfd sp!, {r0, r4, UNWIND(fpreg,) lr}
+ UNWIND( .setfp fpreg, sp )
+ UNWIND( mov fpreg, sp )
+ 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, r6, r8, r9}
+ blt 5f
+
+ CALGN( ands ip, r0, #31 )
+ CALGN( sbcsne 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, r8, r9, ip, lr}
+ subs r2, r2, #32
+ stmdb r0!, {r3, r4, r5, r6, r8, r9, 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) r8, [r1, #-4]!
+ W(ldr) r9, [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) r8, [r0, #-4]!
+ W(str) r9, [r0, #-4]!
+ W(str) lr, [r0, #-4]!
+
+ CALGN( bcs 2b )
+
+7: ldmfd sp!, {r5, r6, r8, r9}
+
+8: movs r2, r2, lsl #31
+ ldrbne r3, [r1, #-1]!
+ ldrbcs r4, [r1, #-1]!
+ ldrbcs ip, [r1, #-1]
+ strbne r3, [r0, #-1]!
+ strbcs r4, [r0, #-1]!
+ strbcs ip, [r0, #-1]
+ ldmfd sp!, {r0, r4, UNWIND(fpreg,) pc}
+
+9: cmp ip, #2
+ ldrbgt r3, [r1, #-1]!
+ ldrbge r4, [r1, #-1]!
+ ldrb lr, [r1, #-1]!
+ strbgt r3, [r0, #-1]!
+ strbge 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( sbcsne r4, ip, r2 ) @ C is always set here
+ CALGN( subcc r2, r2, ip )
+ CALGN( bcc 15f )
+
+11: stmfd sp!, {r5, r6, r8 - r10}
+
+ 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!, {r8, r9, r10, ip}
+ mov lr, r3, lspush #\push
+ subs r2, r2, #32
+ ldmdb r1!, {r3, r4, r5, r6}
+ orr lr, lr, ip, lspull #\pull
+ mov ip, ip, lspush #\push
+ orr ip, ip, r10, lspull #\pull
+ mov r10, r10, lspush #\push
+ orr r10, r10, r9, lspull #\pull
+ mov r9, r9, lspush #\push
+ orr r9, r9, r8, lspull #\pull
+ mov r8, r8, lspush #\push
+ orr r8, r8, r6, lspull #\pull
+ mov r6, r6, lspush #\push
+ orr r6, r6, r5, lspull #\pull
+ mov r5, r5, lspush #\push
+ orr r5, r5, r4, lspull #\pull
+ mov r4, r4, lspush #\push
+ orr r4, r4, r3, lspull #\pull
+ stmdb r0!, {r4 - r6, r8 - r10, ip, lr}
+ bge 12b
+ PLD( cmn r2, #96 )
+ PLD( bge 13b )
+
+ ldmfd sp!, {r5, r6, r8 - r10}
+
+14: ands ip, r2, #28
+ beq 16f
+
+15: mov lr, r3, lspush #\push
+ ldr r3, [r1, #-4]!
+ subs ip, ip, #4
+ orr lr, lr, r3, lspull #\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
+
+ UNWIND( .fnend )
+ENDPROC(memmove)
+ENDPROC(__memmove)
diff --git a/arch/arm/lib64/copy_template.S b/arch/arm/lib64/copy_template.S
deleted file mode 100644
index 8e4ff059d1..0000000000
--- a/arch/arm/lib64/copy_template.S
+++ /dev/null
@@ -1,180 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-only */
-/* SPDX-FileCopyrightText: 2013 ARM Ltd. */
-/* SPDX-FileCopyrightText: 2013 Linaro */
-
-/*
- * This code is based on glibc cortex strings work originally authored by Linaro
- * and re-licensed under GPLv2 for the Linux kernel. The original code can
- * be found @
- *
- * http://bazaar.launchpad.net/~linaro-toolchain-dev/cortex-strings/trunk/
- * files/head:/src/aarch64/
- */
-
-/*
- * Copy a buffer from src to dest (alignment handled by the hardware)
- *
- * 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
-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
-
- mov dst, dstin
- cmp count, #16
- /*When memory length is less than 16, the accessed are not aligned.*/
- b.lo .Ltiny15
-
- neg tmp2, src
- ands tmp2, tmp2, #15/* Bytes to reach alignment. */
- b.eq .LSrcAligned
- sub count, count, tmp2
- /*
- * Copy the leading memory data from src to dst in an increasing
- * address order.By this way,the risk of overwritting the source
- * memory data is eliminated when the distance between src and
- * dst is less than 16. The memory accesses here are alignment.
- */
- tbz tmp2, #0, 1f
- ldrb1 tmp1w, src, #1
- strb1 tmp1w, dst, #1
-1:
- tbz tmp2, #1, 2f
- ldrh1 tmp1w, src, #2
- strh1 tmp1w, dst, #2
-2:
- tbz tmp2, #2, 3f
- ldr1 tmp1w, src, #4
- str1 tmp1w, dst, #4
-3:
- tbz tmp2, #3, .LSrcAligned
- ldr1 tmp1, src, #8
- str1 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 .Ltiny15
- cmp tmp1w, #0x20
- b.eq 1f
- b.lt 2f
- ldp1 A_l, A_h, src, #16
- stp1 A_l, A_h, dst, #16
-1:
- ldp1 A_l, A_h, src, #16
- stp1 A_l, A_h, dst, #16
-2:
- ldp1 A_l, A_h, src, #16
- stp1 A_l, A_h, dst, #16
-.Ltiny15:
- /*
- * Prefer to break one ldp/stp into several load/store to access
- * memory in an increasing address order,rather than to load/store 16
- * bytes from (src-16) to (dst-16) and to backward the src to aligned
- * address,which way is used in original cortex memcpy. If keeping
- * the original memcpy process here, memmove need to satisfy the
- * precondition that src address is at least 16 bytes bigger than dst
- * address,otherwise some source data will be overwritten when memove
- * call memcpy directly. To make memmove simpler and decouple the
- * memcpy's dependency on memmove, withdrew the original process.
- */
- tbz count, #3, 1f
- ldr1 tmp1, src, #8
- str1 tmp1, dst, #8
-1:
- tbz count, #2, 2f
- ldr1 tmp1w, src, #4
- str1 tmp1w, dst, #4
-2:
- tbz count, #1, 3f
- ldrh1 tmp1w, src, #2
- strh1 tmp1w, dst, #2
-3:
- tbz count, #0, .Lexitfunc
- ldrb1 tmp1w, src, #1
- strb1 tmp1w, dst, #1
-
- b .Lexitfunc
-
-.Lcpy_over64:
- subs count, count, #128
- b.ge .Lcpy_body_large
- /*
- * Less than 128 bytes to copy, so handle 64 here and then jump
- * to the tail.
- */
- ldp1 A_l, A_h, src, #16
- stp1 A_l, A_h, dst, #16
- ldp1 B_l, B_h, src, #16
- ldp1 C_l, C_h, src, #16
- stp1 B_l, B_h, dst, #16
- stp1 C_l, C_h, dst, #16
- ldp1 D_l, D_h, src, #16
- stp1 D_l, D_h, dst, #16
-
- tst count, #0x3f
- b.ne .Ltail63
- b .Lexitfunc
-
- /*
- * Critical loop. Start at a new cache line boundary. Assuming
- * 64 bytes per line this ensures the entire loop is in one line.
- */
-.Lcpy_body_large:
- /* pre-get 64 bytes data. */
- ldp1 A_l, A_h, src, #16
- ldp1 B_l, B_h, src, #16
- ldp1 C_l, C_h, src, #16
- ldp1 D_l, D_h, src, #16
-1:
- /*
- * interlace the load of next 64 bytes data block with store of the last
- * loaded 64 bytes data.
- */
- stp1 A_l, A_h, dst, #16
- ldp1 A_l, A_h, src, #16
- stp1 B_l, B_h, dst, #16
- ldp1 B_l, B_h, src, #16
- stp1 C_l, C_h, dst, #16
- ldp1 C_l, C_h, src, #16
- stp1 D_l, D_h, dst, #16
- ldp1 D_l, D_h, src, #16
- subs count, count, #64
- b.ge 1b
- stp1 A_l, A_h, dst, #16
- stp1 B_l, B_h, dst, #16
- stp1 C_l, C_h, dst, #16
- stp1 D_l, D_h, dst, #16
-
- tst count, #0x3f
- b.ne .Ltail63
-.Lexitfunc:
diff --git a/arch/arm/lib64/memcpy.S b/arch/arm/lib64/memcpy.S
index 92845b25a6..98b453d3fd 100644
--- a/arch/arm/lib64/memcpy.S
+++ b/arch/arm/lib64/memcpy.S
@@ -1,63 +1,249 @@
/* SPDX-License-Identifier: GPL-2.0-only */
-/* SPDX-FileCopyrightText: 2013 ARM Ltd. */
-/* SPDX-FileCopyrightText: 2013 Linaro */
-
/*
- * This code is based on glibc cortex strings work originally authored by Linaro
- * and re-licensed under GPLv2 for the Linux kernel. The original code can
- * be found @
+ * Copyright (c) 2012-2021, Arm Limited.
*
- * http://bazaar.launchpad.net/~linaro-toolchain-dev/cortex-strings/trunk/
- * files/head:/src/aarch64/
+ * Adapted from the original at:
+ * https://github.com/ARM-software/optimized-routines/blob/afd6244a1f8d9229/string/aarch64/memcpy.S
*/
#include <linux/linkage.h>
#include <asm/assembler.h>
-/*
- * Copy a buffer from src to dest (alignment handled by the hardware)
+/* Assumptions:
+ *
+ * ARMv8-a, AArch64, unaligned accesses.
*
- * Parameters:
- * x0 - dest
- * x1 - src
- * x2 - n
- * Returns:
- * x0 - dest
*/
- .macro ldrb1 ptr, regB, val
- ldrb \ptr, [\regB], \val
- .endm
- .macro strb1 ptr, regB, val
- strb \ptr, [\regB], \val
- .endm
+#define L(label) .L ## label
+
+#define dstin x0
+#define src x1
+#define count x2
+#define dst x3
+#define srcend x4
+#define dstend x5
+#define A_l x6
+#define A_lw w6
+#define A_h x7
+#define B_l x8
+#define B_lw w8
+#define B_h x9
+#define C_l x10
+#define C_lw w10
+#define C_h x11
+#define D_l x12
+#define D_h x13
+#define E_l x14
+#define E_h x15
+#define F_l x16
+#define F_h x17
+#define G_l count
+#define G_h dst
+#define H_l src
+#define H_h srcend
+#define tmp1 x14
+
+/* This implementation handles overlaps and supports both memcpy and memmove
+ from a single entry point. It uses unaligned accesses and branchless
+ sequences to keep the code small, simple and improve performance.
+
+ Copies are split into 3 main cases: small copies of up to 32 bytes, medium
+ copies of up to 128 bytes, and large copies. The overhead of the overlap
+ check is negligible since it is only required for large copies.
+
+ Large copies use a software pipelined loop processing 64 bytes per iteration.
+ The destination pointer is 16-byte aligned to minimize unaligned accesses.
+ The loop tail is handled by always copying 64 bytes from the end.
+*/
+
+SYM_FUNC_START(__pi_memcpy)
+ add srcend, src, count
+ add dstend, dstin, count
+ cmp count, 128
+ b.hi L(copy_long)
+ cmp count, 32
+ b.hi L(copy32_128)
+
+ /* Small copies: 0..32 bytes. */
+ cmp count, 16
+ b.lo L(copy16)
+ ldp A_l, A_h, [src]
+ ldp D_l, D_h, [srcend, -16]
+ stp A_l, A_h, [dstin]
+ stp D_l, D_h, [dstend, -16]
+ ret
+
+ /* Copy 8-15 bytes. */
+L(copy16):
+ tbz count, 3, L(copy8)
+ ldr A_l, [src]
+ ldr A_h, [srcend, -8]
+ str A_l, [dstin]
+ str A_h, [dstend, -8]
+ ret
+
+ .p2align 3
+ /* Copy 4-7 bytes. */
+L(copy8):
+ tbz count, 2, L(copy4)
+ ldr A_lw, [src]
+ ldr B_lw, [srcend, -4]
+ str A_lw, [dstin]
+ str B_lw, [dstend, -4]
+ ret
- .macro ldrh1 ptr, regB, val
- ldrh \ptr, [\regB], \val
- .endm
+ /* Copy 0..3 bytes using a branchless sequence. */
+L(copy4):
+ cbz count, L(copy0)
+ lsr tmp1, count, 1
+ ldrb A_lw, [src]
+ ldrb C_lw, [srcend, -1]
+ ldrb B_lw, [src, tmp1]
+ strb A_lw, [dstin]
+ strb B_lw, [dstin, tmp1]
+ strb C_lw, [dstend, -1]
+L(copy0):
+ ret
- .macro strh1 ptr, regB, val
- strh \ptr, [\regB], \val
- .endm
+ .p2align 4
+ /* Medium copies: 33..128 bytes. */
+L(copy32_128):
+ ldp A_l, A_h, [src]
+ ldp B_l, B_h, [src, 16]
+ ldp C_l, C_h, [srcend, -32]
+ ldp D_l, D_h, [srcend, -16]
+ cmp count, 64
+ b.hi L(copy128)
+ stp A_l, A_h, [dstin]
+ stp B_l, B_h, [dstin, 16]
+ stp C_l, C_h, [dstend, -32]
+ stp D_l, D_h, [dstend, -16]
+ ret
- .macro ldr1 ptr, regB, val
- ldr \ptr, [\regB], \val
- .endm
+ .p2align 4
+ /* Copy 65..128 bytes. */
+L(copy128):
+ ldp E_l, E_h, [src, 32]
+ ldp F_l, F_h, [src, 48]
+ cmp count, 96
+ b.ls L(copy96)
+ ldp G_l, G_h, [srcend, -64]
+ ldp H_l, H_h, [srcend, -48]
+ stp G_l, G_h, [dstend, -64]
+ stp H_l, H_h, [dstend, -48]
+L(copy96):
+ stp A_l, A_h, [dstin]
+ stp B_l, B_h, [dstin, 16]
+ stp E_l, E_h, [dstin, 32]
+ stp F_l, F_h, [dstin, 48]
+ stp C_l, C_h, [dstend, -32]
+ stp D_l, D_h, [dstend, -16]
+ ret
- .macro str1 ptr, regB, val
- str \ptr, [\regB], \val
- .endm
+ .p2align 4
+ /* Copy more than 128 bytes. */
+L(copy_long):
+ /* Use backwards copy if there is an overlap. */
+ sub tmp1, dstin, src
+ cbz tmp1, L(copy0)
+ cmp tmp1, count
+ b.lo L(copy_long_backwards)
- .macro ldp1 ptr, regB, regC, val
- ldp \ptr, \regB, [\regC], \val
- .endm
+ /* Copy 16 bytes and then align dst to 16-byte alignment. */
- .macro stp1 ptr, regB, regC, val
- stp \ptr, \regB, [\regC], \val
- .endm
+ ldp D_l, D_h, [src]
+ and tmp1, dstin, 15
+ bic dst, dstin, 15
+ sub src, src, tmp1
+ add count, count, tmp1 /* Count is now 16 too large. */
+ ldp A_l, A_h, [src, 16]
+ stp D_l, D_h, [dstin]
+ ldp B_l, B_h, [src, 32]
+ ldp C_l, C_h, [src, 48]
+ ldp D_l, D_h, [src, 64]!
+ subs count, count, 128 + 16 /* Test and readjust count. */
+ b.ls L(copy64_from_end)
- .weak __arch_memcpy
-ENTRY(__arch_memcpy)
-#include "copy_template.S"
+L(loop64):
+ 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.hi L(loop64)
+
+ /* Write the last iteration and copy 64 bytes from the end. */
+L(copy64_from_end):
+ ldp E_l, E_h, [srcend, -64]
+ stp A_l, A_h, [dst, 16]
+ ldp A_l, A_h, [srcend, -48]
+ stp B_l, B_h, [dst, 32]
+ ldp B_l, B_h, [srcend, -32]
+ stp C_l, C_h, [dst, 48]
+ ldp C_l, C_h, [srcend, -16]
+ stp D_l, D_h, [dst, 64]
+ stp E_l, E_h, [dstend, -64]
+ stp A_l, A_h, [dstend, -48]
+ stp B_l, B_h, [dstend, -32]
+ stp C_l, C_h, [dstend, -16]
ret
-ENDPROC(__arch_memcpy)
+
+ .p2align 4
+
+ /* Large backwards copy for overlapping copies.
+ Copy 16 bytes and then align dst to 16-byte alignment. */
+L(copy_long_backwards):
+ ldp D_l, D_h, [srcend, -16]
+ and tmp1, dstend, 15
+ sub srcend, srcend, tmp1
+ sub count, count, tmp1
+ ldp A_l, A_h, [srcend, -16]
+ stp D_l, D_h, [dstend, -16]
+ ldp B_l, B_h, [srcend, -32]
+ ldp C_l, C_h, [srcend, -48]
+ ldp D_l, D_h, [srcend, -64]!
+ sub dstend, dstend, tmp1
+ subs count, count, 128
+ b.ls L(copy64_from_start)
+
+L(loop64_backwards):
+ stp A_l, A_h, [dstend, -16]
+ ldp A_l, A_h, [srcend, -16]
+ stp B_l, B_h, [dstend, -32]
+ ldp B_l, B_h, [srcend, -32]
+ stp C_l, C_h, [dstend, -48]
+ ldp C_l, C_h, [srcend, -48]
+ stp D_l, D_h, [dstend, -64]!
+ ldp D_l, D_h, [srcend, -64]!
+ subs count, count, 64
+ b.hi L(loop64_backwards)
+
+ /* Write the last iteration and copy 64 bytes from the start. */
+L(copy64_from_start):
+ ldp G_l, G_h, [src, 48]
+ stp A_l, A_h, [dstend, -16]
+ ldp A_l, A_h, [src, 32]
+ stp B_l, B_h, [dstend, -32]
+ ldp B_l, B_h, [src, 16]
+ stp C_l, C_h, [dstend, -48]
+ ldp C_l, C_h, [src]
+ stp D_l, D_h, [dstend, -64]
+ stp G_l, G_h, [dstin, 48]
+ stp A_l, A_h, [dstin, 32]
+ stp B_l, B_h, [dstin, 16]
+ stp C_l, C_h, [dstin]
+ ret
+SYM_FUNC_END(__pi_memcpy)
+
+SYM_FUNC_ALIAS(__arch_memcpy, __pi_memcpy)
+SYM_FUNC_ALIAS_WEAK(memcpy, __memcpy)
+
+SYM_FUNC_ALIAS(__pi_memmove, __pi_memcpy)
+
+SYM_FUNC_ALIAS(__arch_memmove, __pi_memmove)
+SYM_FUNC_ALIAS_WEAK(memmove, __memmove)
diff --git a/arch/arm/lib64/memset.S b/arch/arm/lib64/memset.S
index ff201750f1..f059203983 100644
--- a/arch/arm/lib64/memset.S
+++ b/arch/arm/lib64/memset.S
@@ -1,10 +1,9 @@
/* SPDX-License-Identifier: GPL-2.0-only */
-/* SPDX-FileCopyrightText: 2013 ARM Ltd. */
-/* SPDX-FileCopyrightText: 2013 Linaro */
-
/*
+ * Copyright (C) 2013 ARM Ltd.
+ * Copyright (C) 2013 Linaro.
+ *
* This code is based on glibc cortex strings work originally authored by Linaro
- * and re-licensed under GPLv2 for the Linux kernel. The original code can
* be found @
*
* http://bazaar.launchpad.net/~linaro-toolchain-dev/cortex-strings/trunk/
@@ -13,6 +12,7 @@
#include <linux/linkage.h>
#include <asm/assembler.h>
+#include <asm/cache.h>
/*
* Fill in the buffer with character c (alignment handled by the hardware)
@@ -42,8 +42,7 @@ dst .req x8
tmp3w .req w9
tmp3 .req x9
- .weak memset
-ENTRY(__arch_memset)
+SYM_FUNC_START(__pi_memset)
mov dst, dstin /* Preserve return value. */
and A_lw, val, #255
orr A_lw, A_lw, A_lw, lsl #8
@@ -115,6 +114,7 @@ ENTRY(__arch_memset)
* 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
.Lnot_short:
sub dst, dst, #16/* Pre-bias. */
sub count, count, #64
@@ -201,4 +201,8 @@ ENTRY(__arch_memset)
ands count, count, zva_bits_x
b.ne .Ltail_maybe_long
ret
-ENDPROC(__arch_memset)
+SYM_FUNC_END(__pi_memset)
+
+SYM_FUNC_ALIAS(__arch_memset, __pi_memset)
+
+SYM_FUNC_ALIAS_WEAK(memset, __pi_memset)
diff --git a/arch/arm/lib64/string.c b/arch/arm/lib64/string.c
index 938790e1a9..c7954d6efe 100644
--- a/arch/arm/lib64/string.c
+++ b/arch/arm/lib64/string.c
@@ -6,6 +6,7 @@
void *__arch_memset(void *dst, int c, __kernel_size_t size);
void *__arch_memcpy(void * dest, const void *src, size_t count);
+void *__arch_memmove(void * dest, const void *src, size_t count);
static __prereloc void *_memset(void *dst, int c, __kernel_size_t size)
{
@@ -38,3 +39,19 @@ void __weak *memcpy(void * dest, const void *src, size_t count)
void *__memcpy(void * dest, const void *src, size_t count)
__alias(_memcpy);
+
+static void *_memmove(void * dest, const void *src, size_t count)
+{
+ if (likely(get_cr() & CR_M))
+ return __arch_memmove(dest, src, count);
+
+ return __default_memmove(dest, src, count);
+}
+
+void __weak *memmove(void * dest, const void *src, size_t count)
+{
+ return _memmove(dest, src, count);
+}
+
+void *__memmove(void * dest, const void *src, size_t count)
+ __alias(_memmove);
diff --git a/include/string.h b/include/string.h
index cbe6eddf7f..986ccd83dd 100644
--- a/include/string.h
+++ b/include/string.h
@@ -17,6 +17,8 @@ void *__nokasan_default_memset(void *, int, __kernel_size_t);
void *__default_memcpy(void * dest,const void *src,size_t count);
void *__nokasan_default_memcpy(void * dest,const void *src,size_t count);
+void *__default_memmove(void * dest,const void *src,size_t count);
+
char *parse_assignment(char *str);
int strverscmp(const char *a, const char *b);
diff --git a/lib/string.c b/lib/string.c
index 98dd3cffdd..50c2016c2b 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -701,7 +701,6 @@ void *memmove(void * dest, const void *src, size_t count)
void *__memmove(void * dest, const void *src, size_t count)
__alias(__default_memmove);
#endif
-EXPORT_SYMBOL(memmove);
#ifndef __HAVE_ARCH_MEMCMP
/**
--
2.39.5
