* commit '7239135eb4d651140a40cd4549b8d9e1101a0c20': Add stpcpy assembler version.
This commit is contained in:
Christopher Ferris
@@ -41,7 +41,6 @@ libc_freebsd_src_files_arm += \
|
||||
|
||||
libc_openbsd_src_files_arm += \
|
||||
upstream-openbsd/lib/libc/string/bcopy.c \
|
||||
upstream-openbsd/lib/libc/string/stpcpy.c \
|
||||
upstream-openbsd/lib/libc/string/stpncpy.c \
|
||||
upstream-openbsd/lib/libc/string/strlcat.c \
|
||||
upstream-openbsd/lib/libc/string/strlcpy.c \
|
||||
|
||||
30
libc/arch-arm/cortex-a15/bionic/stpcpy.S
Normal file
30
libc/arch-arm/cortex-a15/bionic/stpcpy.S
Normal file
@@ -0,0 +1,30 @@
|
||||
/*
|
||||
* Copyright (C) 2014 The Android Open Source Project
|
||||
* 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.
|
||||
*
|
||||
* 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 OWNER 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.
|
||||
*/
|
||||
|
||||
#define STPCPY
|
||||
#include "string_copy.S"
|
||||
@@ -1,5 +1,5 @@
|
||||
/*
|
||||
* Copyright (C) 2013 The Android Open Source Project
|
||||
* Copyright (C) 2014 The Android Open Source Project
|
||||
* All rights reserved.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
@@ -25,432 +25,6 @@
|
||||
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
||||
* SUCH DAMAGE.
|
||||
*/
|
||||
/*
|
||||
* Copyright (c) 2013 ARM 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:
|
||||
* 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.
|
||||
* 3. The name of the company may not be used to endorse or promote
|
||||
* products derived from this software without specific prior written
|
||||
* permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY ARM LTD ``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 ARM LTD 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 <private/bionic_asm.h>
|
||||
|
||||
.syntax unified
|
||||
|
||||
.thumb
|
||||
.thumb_func
|
||||
|
||||
.macro m_push
|
||||
push {r0, r4, r5, lr}
|
||||
.cfi_def_cfa_offset 16
|
||||
.cfi_rel_offset r0, 0
|
||||
.cfi_rel_offset r4, 4
|
||||
.cfi_rel_offset r5, 8
|
||||
.cfi_rel_offset lr, 12
|
||||
.endm // m_push
|
||||
|
||||
.macro m_pop
|
||||
pop {r0, r4, r5, pc}
|
||||
.endm // m_pop
|
||||
|
||||
.macro m_copy_byte reg, cmd, label
|
||||
ldrb \reg, [r1], #1
|
||||
strb \reg, [r0], #1
|
||||
\cmd \reg, \label
|
||||
.endm // m_copy_byte
|
||||
|
||||
ENTRY(strcpy)
|
||||
// For short copies, hard-code checking the first 8 bytes since this
|
||||
// new code doesn't win until after about 8 bytes.
|
||||
m_push
|
||||
m_copy_byte reg=r2, cmd=cbz, label=.Lstrcpy_finish
|
||||
m_copy_byte reg=r3, cmd=cbz, label=.Lstrcpy_finish
|
||||
m_copy_byte reg=r4, cmd=cbz, label=.Lstrcpy_finish
|
||||
m_copy_byte reg=r5, cmd=cbz, label=.Lstrcpy_finish
|
||||
m_copy_byte reg=r2, cmd=cbz, label=.Lstrcpy_finish
|
||||
m_copy_byte reg=r3, cmd=cbz, label=.Lstrcpy_finish
|
||||
m_copy_byte reg=r4, cmd=cbz, label=.Lstrcpy_finish
|
||||
m_copy_byte reg=r5, cmd=cbnz, label=.Lstrcpy_continue
|
||||
|
||||
.Lstrcpy_finish:
|
||||
m_pop
|
||||
|
||||
.Lstrcpy_continue:
|
||||
pld [r1, #0]
|
||||
ands r3, r0, #7
|
||||
beq .Lstrcpy_check_src_align
|
||||
|
||||
// Align to a double word (64 bits).
|
||||
rsb r3, r3, #8
|
||||
lsls ip, r3, #31
|
||||
beq .Lstrcpy_align_to_32
|
||||
|
||||
ldrb r2, [r1], #1
|
||||
strb r2, [r0], #1
|
||||
cbz r2, .Lstrcpy_complete
|
||||
|
||||
.Lstrcpy_align_to_32:
|
||||
bcc .Lstrcpy_align_to_64
|
||||
|
||||
ldrb r2, [r1], #1
|
||||
strb r2, [r0], #1
|
||||
cbz r2, .Lstrcpy_complete
|
||||
ldrb r2, [r1], #1
|
||||
strb r2, [r0], #1
|
||||
cbz r2, .Lstrcpy_complete
|
||||
|
||||
.Lstrcpy_align_to_64:
|
||||
tst r3, #4
|
||||
beq .Lstrcpy_check_src_align
|
||||
ldr r2, [r1], #4
|
||||
|
||||
sub ip, r2, #0x01010101
|
||||
bic ip, ip, r2
|
||||
ands ip, ip, #0x80808080
|
||||
bne .Lstrcpy_zero_in_first_register
|
||||
str r2, [r0], #4
|
||||
|
||||
.Lstrcpy_check_src_align:
|
||||
// At this point dst is aligned to a double word, check if src
|
||||
// is also aligned to a double word.
|
||||
ands r3, r1, #7
|
||||
bne .Lstrcpy_unaligned_copy
|
||||
|
||||
.p2align 2
|
||||
.Lstrcpy_mainloop:
|
||||
ldrd r2, r3, [r1], #8
|
||||
|
||||
pld [r1, #64]
|
||||
|
||||
sub ip, r2, #0x01010101
|
||||
bic ip, ip, r2
|
||||
ands ip, ip, #0x80808080
|
||||
bne .Lstrcpy_zero_in_first_register
|
||||
|
||||
sub ip, r3, #0x01010101
|
||||
bic ip, ip, r3
|
||||
ands ip, ip, #0x80808080
|
||||
bne .Lstrcpy_zero_in_second_register
|
||||
|
||||
strd r2, r3, [r0], #8
|
||||
b .Lstrcpy_mainloop
|
||||
|
||||
.Lstrcpy_complete:
|
||||
m_pop
|
||||
|
||||
.Lstrcpy_zero_in_first_register:
|
||||
lsls lr, ip, #17
|
||||
bne .Lstrcpy_copy1byte
|
||||
bcs .Lstrcpy_copy2bytes
|
||||
lsls ip, ip, #1
|
||||
bne .Lstrcpy_copy3bytes
|
||||
|
||||
.Lstrcpy_copy4bytes:
|
||||
// Copy 4 bytes to the destiniation.
|
||||
str r2, [r0]
|
||||
m_pop
|
||||
|
||||
.Lstrcpy_copy1byte:
|
||||
strb r2, [r0]
|
||||
m_pop
|
||||
|
||||
.Lstrcpy_copy2bytes:
|
||||
strh r2, [r0]
|
||||
m_pop
|
||||
|
||||
.Lstrcpy_copy3bytes:
|
||||
strh r2, [r0], #2
|
||||
lsr r2, #16
|
||||
strb r2, [r0]
|
||||
m_pop
|
||||
|
||||
.Lstrcpy_zero_in_second_register:
|
||||
lsls lr, ip, #17
|
||||
bne .Lstrcpy_copy5bytes
|
||||
bcs .Lstrcpy_copy6bytes
|
||||
lsls ip, ip, #1
|
||||
bne .Lstrcpy_copy7bytes
|
||||
|
||||
// Copy 8 bytes to the destination.
|
||||
strd r2, r3, [r0]
|
||||
m_pop
|
||||
|
||||
.Lstrcpy_copy5bytes:
|
||||
str r2, [r0], #4
|
||||
strb r3, [r0]
|
||||
m_pop
|
||||
|
||||
.Lstrcpy_copy6bytes:
|
||||
str r2, [r0], #4
|
||||
strh r3, [r0]
|
||||
m_pop
|
||||
|
||||
.Lstrcpy_copy7bytes:
|
||||
str r2, [r0], #4
|
||||
strh r3, [r0], #2
|
||||
lsr r3, #16
|
||||
strb r3, [r0]
|
||||
m_pop
|
||||
|
||||
.Lstrcpy_unaligned_copy:
|
||||
// Dst is aligned to a double word, while src is at an unknown alignment.
|
||||
// There are 7 different versions of the unaligned copy code
|
||||
// to prevent overreading the src. The mainloop of every single version
|
||||
// will store 64 bits per loop. The difference is how much of src can
|
||||
// be read without potentially crossing a page boundary.
|
||||
tbb [pc, r3]
|
||||
.Lstrcpy_unaligned_branchtable:
|
||||
.byte 0
|
||||
.byte ((.Lstrcpy_unalign7 - .Lstrcpy_unaligned_branchtable)/2)
|
||||
.byte ((.Lstrcpy_unalign6 - .Lstrcpy_unaligned_branchtable)/2)
|
||||
.byte ((.Lstrcpy_unalign5 - .Lstrcpy_unaligned_branchtable)/2)
|
||||
.byte ((.Lstrcpy_unalign4 - .Lstrcpy_unaligned_branchtable)/2)
|
||||
.byte ((.Lstrcpy_unalign3 - .Lstrcpy_unaligned_branchtable)/2)
|
||||
.byte ((.Lstrcpy_unalign2 - .Lstrcpy_unaligned_branchtable)/2)
|
||||
.byte ((.Lstrcpy_unalign1 - .Lstrcpy_unaligned_branchtable)/2)
|
||||
|
||||
.p2align 2
|
||||
// Can read 7 bytes before possibly crossing a page.
|
||||
.Lstrcpy_unalign7:
|
||||
ldr r2, [r1], #4
|
||||
|
||||
sub ip, r2, #0x01010101
|
||||
bic ip, ip, r2
|
||||
ands ip, ip, #0x80808080
|
||||
bne .Lstrcpy_zero_in_first_register
|
||||
|
||||
ldrb r3, [r1]
|
||||
cbz r3, .Lstrcpy_unalign7_copy5bytes
|
||||
ldrb r4, [r1, #1]
|
||||
cbz r4, .Lstrcpy_unalign7_copy6bytes
|
||||
ldrb r5, [r1, #2]
|
||||
cbz r5, .Lstrcpy_unalign7_copy7bytes
|
||||
|
||||
ldr r3, [r1], #4
|
||||
pld [r1, #64]
|
||||
|
||||
lsrs ip, r3, #24
|
||||
strd r2, r3, [r0], #8
|
||||
beq .Lstrcpy_unalign_return
|
||||
b .Lstrcpy_unalign7
|
||||
|
||||
.Lstrcpy_unalign7_copy5bytes:
|
||||
str r2, [r0], #4
|
||||
strb r3, [r0]
|
||||
.Lstrcpy_unalign_return:
|
||||
m_pop
|
||||
|
||||
.Lstrcpy_unalign7_copy6bytes:
|
||||
str r2, [r0], #4
|
||||
strb r3, [r0], #1
|
||||
strb r4, [r0], #1
|
||||
m_pop
|
||||
|
||||
.Lstrcpy_unalign7_copy7bytes:
|
||||
str r2, [r0], #4
|
||||
strb r3, [r0], #1
|
||||
strb r4, [r0], #1
|
||||
strb r5, [r0], #1
|
||||
m_pop
|
||||
|
||||
.p2align 2
|
||||
// Can read 6 bytes before possibly crossing a page.
|
||||
.Lstrcpy_unalign6:
|
||||
ldr r2, [r1], #4
|
||||
|
||||
sub ip, r2, #0x01010101
|
||||
bic ip, ip, r2
|
||||
ands ip, ip, #0x80808080
|
||||
bne .Lstrcpy_zero_in_first_register
|
||||
|
||||
ldrb r4, [r1]
|
||||
cbz r4, .Lstrcpy_unalign_copy5bytes
|
||||
ldrb r5, [r1, #1]
|
||||
cbz r5, .Lstrcpy_unalign_copy6bytes
|
||||
|
||||
ldr r3, [r1], #4
|
||||
pld [r1, #64]
|
||||
|
||||
tst r3, #0xff0000
|
||||
beq .Lstrcpy_copy7bytes
|
||||
lsrs ip, r3, #24
|
||||
strd r2, r3, [r0], #8
|
||||
beq .Lstrcpy_unalign_return
|
||||
b .Lstrcpy_unalign6
|
||||
|
||||
.p2align 2
|
||||
// Can read 5 bytes before possibly crossing a page.
|
||||
.Lstrcpy_unalign5:
|
||||
ldr r2, [r1], #4
|
||||
|
||||
sub ip, r2, #0x01010101
|
||||
bic ip, ip, r2
|
||||
ands ip, ip, #0x80808080
|
||||
bne .Lstrcpy_zero_in_first_register
|
||||
|
||||
ldrb r4, [r1]
|
||||
cbz r4, .Lstrcpy_unalign_copy5bytes
|
||||
|
||||
ldr r3, [r1], #4
|
||||
|
||||
pld [r1, #64]
|
||||
|
||||
sub ip, r3, #0x01010101
|
||||
bic ip, ip, r3
|
||||
ands ip, ip, #0x80808080
|
||||
bne .Lstrcpy_zero_in_second_register
|
||||
|
||||
strd r2, r3, [r0], #8
|
||||
b .Lstrcpy_unalign5
|
||||
|
||||
.Lstrcpy_unalign_copy5bytes:
|
||||
str r2, [r0], #4
|
||||
strb r4, [r0]
|
||||
m_pop
|
||||
|
||||
.Lstrcpy_unalign_copy6bytes:
|
||||
str r2, [r0], #4
|
||||
strb r4, [r0], #1
|
||||
strb r5, [r0]
|
||||
m_pop
|
||||
|
||||
.p2align 2
|
||||
// Can read 4 bytes before possibly crossing a page.
|
||||
.Lstrcpy_unalign4:
|
||||
ldr r2, [r1], #4
|
||||
|
||||
sub ip, r2, #0x01010101
|
||||
bic ip, ip, r2
|
||||
ands ip, ip, #0x80808080
|
||||
bne .Lstrcpy_zero_in_first_register
|
||||
|
||||
ldr r3, [r1], #4
|
||||
pld [r1, #64]
|
||||
|
||||
sub ip, r3, #0x01010101
|
||||
bic ip, ip, r3
|
||||
ands ip, ip, #0x80808080
|
||||
bne .Lstrcpy_zero_in_second_register
|
||||
|
||||
strd r2, r3, [r0], #8
|
||||
b .Lstrcpy_unalign4
|
||||
|
||||
.p2align 2
|
||||
// Can read 3 bytes before possibly crossing a page.
|
||||
.Lstrcpy_unalign3:
|
||||
ldrb r2, [r1]
|
||||
cbz r2, .Lstrcpy_unalign3_copy1byte
|
||||
ldrb r3, [r1, #1]
|
||||
cbz r3, .Lstrcpy_unalign3_copy2bytes
|
||||
ldrb r4, [r1, #2]
|
||||
cbz r4, .Lstrcpy_unalign3_copy3bytes
|
||||
|
||||
ldr r2, [r1], #4
|
||||
ldr r3, [r1], #4
|
||||
|
||||
pld [r1, #64]
|
||||
|
||||
lsrs lr, r2, #24
|
||||
beq .Lstrcpy_copy4bytes
|
||||
|
||||
sub ip, r3, #0x01010101
|
||||
bic ip, ip, r3
|
||||
ands ip, ip, #0x80808080
|
||||
bne .Lstrcpy_zero_in_second_register
|
||||
|
||||
strd r2, r3, [r0], #8
|
||||
b .Lstrcpy_unalign3
|
||||
|
||||
.Lstrcpy_unalign3_copy1byte:
|
||||
strb r2, [r0]
|
||||
m_pop
|
||||
|
||||
.Lstrcpy_unalign3_copy2bytes:
|
||||
strb r2, [r0], #1
|
||||
strb r3, [r0]
|
||||
m_pop
|
||||
|
||||
.Lstrcpy_unalign3_copy3bytes:
|
||||
strb r2, [r0], #1
|
||||
strb r3, [r0], #1
|
||||
strb r4, [r0]
|
||||
m_pop
|
||||
|
||||
.p2align 2
|
||||
// Can read 2 bytes before possibly crossing a page.
|
||||
.Lstrcpy_unalign2:
|
||||
ldrb r2, [r1]
|
||||
cbz r2, .Lstrcpy_unalign_copy1byte
|
||||
ldrb r4, [r1, #1]
|
||||
cbz r4, .Lstrcpy_unalign_copy2bytes
|
||||
|
||||
ldr r2, [r1], #4
|
||||
ldr r3, [r1], #4
|
||||
pld [r1, #64]
|
||||
|
||||
tst r2, #0xff0000
|
||||
beq .Lstrcpy_copy3bytes
|
||||
lsrs ip, r2, #24
|
||||
beq .Lstrcpy_copy4bytes
|
||||
|
||||
sub ip, r3, #0x01010101
|
||||
bic ip, ip, r3
|
||||
ands ip, ip, #0x80808080
|
||||
bne .Lstrcpy_zero_in_second_register
|
||||
|
||||
strd r2, r3, [r0], #8
|
||||
b .Lstrcpy_unalign2
|
||||
|
||||
.p2align 2
|
||||
// Can read 1 byte before possibly crossing a page.
|
||||
.Lstrcpy_unalign1:
|
||||
ldrb r2, [r1]
|
||||
cbz r2, .Lstrcpy_unalign_copy1byte
|
||||
|
||||
ldr r2, [r1], #4
|
||||
ldr r3, [r1], #4
|
||||
|
||||
pld [r1, #64]
|
||||
|
||||
sub ip, r2, #0x01010101
|
||||
bic ip, ip, r2
|
||||
ands ip, ip, #0x80808080
|
||||
bne .Lstrcpy_zero_in_first_register
|
||||
|
||||
sub ip, r3, #0x01010101
|
||||
bic ip, ip, r3
|
||||
ands ip, ip, #0x80808080
|
||||
bne .Lstrcpy_zero_in_second_register
|
||||
|
||||
strd r2, r3, [r0], #8
|
||||
b .Lstrcpy_unalign1
|
||||
|
||||
.Lstrcpy_unalign_copy1byte:
|
||||
strb r2, [r0]
|
||||
m_pop
|
||||
|
||||
.Lstrcpy_unalign_copy2bytes:
|
||||
strb r2, [r0], #1
|
||||
strb r4, [r0]
|
||||
m_pop
|
||||
END(strcpy)
|
||||
#define STRCPY
|
||||
#include "string_copy.S"
|
||||
|
||||
513
libc/arch-arm/cortex-a15/bionic/string_copy.S
Normal file
513
libc/arch-arm/cortex-a15/bionic/string_copy.S
Normal file
@@ -0,0 +1,513 @@
|
||||
/*
|
||||
* Copyright (C) 2013 The Android Open Source Project
|
||||
* 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.
|
||||
*
|
||||
* 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 OWNER 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.
|
||||
*/
|
||||
/*
|
||||
* Copyright (c) 2013 ARM 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:
|
||||
* 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.
|
||||
* 3. The name of the company may not be used to endorse or promote
|
||||
* products derived from this software without specific prior written
|
||||
* permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY ARM LTD ``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 ARM LTD 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.
|
||||
*/
|
||||
|
||||
#if !defined(STPCPY) && !defined(STRCPY)
|
||||
#error "Either STPCPY or STRCPY must be defined."
|
||||
#endif
|
||||
|
||||
#include <private/bionic_asm.h>
|
||||
|
||||
.syntax unified
|
||||
|
||||
.thumb
|
||||
.thumb_func
|
||||
|
||||
#if defined(STPCPY)
|
||||
.macro m_push
|
||||
push {r4, r5, lr}
|
||||
.cfi_def_cfa_offset 12
|
||||
.cfi_rel_offset r4, 0
|
||||
.cfi_rel_offset r5, 4
|
||||
.cfi_rel_offset lr, 8
|
||||
.endm // m_push
|
||||
#else
|
||||
.macro m_push
|
||||
push {r0, r4, r5, lr}
|
||||
.cfi_def_cfa_offset 16
|
||||
.cfi_rel_offset r0, 0
|
||||
.cfi_rel_offset r4, 4
|
||||
.cfi_rel_offset r5, 8
|
||||
.cfi_rel_offset lr, 12
|
||||
.endm // m_push
|
||||
#endif
|
||||
|
||||
#if defined(STPCPY)
|
||||
.macro m_pop
|
||||
pop {r4, r5, pc}
|
||||
.endm // m_pop
|
||||
#else
|
||||
.macro m_pop
|
||||
pop {r0, r4, r5, pc}
|
||||
.endm // m_pop
|
||||
#endif
|
||||
|
||||
.macro m_copy_byte reg, cmd, label
|
||||
ldrb \reg, [r1], #1
|
||||
strb \reg, [r0], #1
|
||||
\cmd \reg, \label
|
||||
.endm // m_copy_byte
|
||||
|
||||
#if defined(STPCPY)
|
||||
ENTRY(stpcpy)
|
||||
#else
|
||||
ENTRY(strcpy)
|
||||
#endif
|
||||
// For short copies, hard-code checking the first 8 bytes since this
|
||||
// new code doesn't win until after about 8 bytes.
|
||||
m_push
|
||||
m_copy_byte reg=r2, cmd=cbz, label=.Lstringcopy_finish
|
||||
m_copy_byte reg=r3, cmd=cbz, label=.Lstringcopy_finish
|
||||
m_copy_byte reg=r4, cmd=cbz, label=.Lstringcopy_finish
|
||||
m_copy_byte reg=r5, cmd=cbz, label=.Lstringcopy_finish
|
||||
m_copy_byte reg=r2, cmd=cbz, label=.Lstringcopy_finish
|
||||
m_copy_byte reg=r3, cmd=cbz, label=.Lstringcopy_finish
|
||||
m_copy_byte reg=r4, cmd=cbz, label=.Lstringcopy_finish
|
||||
m_copy_byte reg=r5, cmd=cbnz, label=.Lstringcopy_continue
|
||||
|
||||
.Lstringcopy_finish:
|
||||
#if defined(STPCPY)
|
||||
sub r0, r0, #1
|
||||
#endif
|
||||
m_pop
|
||||
|
||||
.Lstringcopy_continue:
|
||||
pld [r1, #0]
|
||||
ands r3, r0, #7
|
||||
beq .Lstringcopy_check_src_align
|
||||
|
||||
// Align to a double word (64 bits).
|
||||
rsb r3, r3, #8
|
||||
lsls ip, r3, #31
|
||||
beq .Lstringcopy_align_to_32
|
||||
|
||||
ldrb r2, [r1], #1
|
||||
strb r2, [r0], #1
|
||||
cbz r2, .Lstringcopy_complete
|
||||
|
||||
.Lstringcopy_align_to_32:
|
||||
bcc .Lstringcopy_align_to_64
|
||||
|
||||
ldrb r2, [r1], #1
|
||||
strb r2, [r0], #1
|
||||
cbz r2, .Lstringcopy_complete
|
||||
ldrb r2, [r1], #1
|
||||
strb r2, [r0], #1
|
||||
cbz r2, .Lstringcopy_complete
|
||||
|
||||
.Lstringcopy_align_to_64:
|
||||
tst r3, #4
|
||||
beq .Lstringcopy_check_src_align
|
||||
ldr r2, [r1], #4
|
||||
|
||||
sub ip, r2, #0x01010101
|
||||
bic ip, ip, r2
|
||||
ands ip, ip, #0x80808080
|
||||
bne .Lstringcopy_zero_in_first_register
|
||||
str r2, [r0], #4
|
||||
|
||||
.Lstringcopy_check_src_align:
|
||||
// At this point dst is aligned to a double word, check if src
|
||||
// is also aligned to a double word.
|
||||
ands r3, r1, #7
|
||||
bne .Lstringcopy_unaligned_copy
|
||||
|
||||
.p2align 2
|
||||
.Lstringcopy_mainloop:
|
||||
ldrd r2, r3, [r1], #8
|
||||
|
||||
pld [r1, #64]
|
||||
|
||||
sub ip, r2, #0x01010101
|
||||
bic ip, ip, r2
|
||||
ands ip, ip, #0x80808080
|
||||
bne .Lstringcopy_zero_in_first_register
|
||||
|
||||
sub ip, r3, #0x01010101
|
||||
bic ip, ip, r3
|
||||
ands ip, ip, #0x80808080
|
||||
bne .Lstringcopy_zero_in_second_register
|
||||
|
||||
strd r2, r3, [r0], #8
|
||||
b .Lstringcopy_mainloop
|
||||
|
||||
.Lstringcopy_complete:
|
||||
#if defined(STPCPY)
|
||||
sub r0, r0, #1
|
||||
#endif
|
||||
m_pop
|
||||
|
||||
.Lstringcopy_zero_in_first_register:
|
||||
lsls lr, ip, #17
|
||||
bne .Lstringcopy_copy1byte
|
||||
bcs .Lstringcopy_copy2bytes
|
||||
lsls ip, ip, #1
|
||||
bne .Lstringcopy_copy3bytes
|
||||
|
||||
.Lstringcopy_copy4bytes:
|
||||
// Copy 4 bytes to the destiniation.
|
||||
#if defined(STPCPY)
|
||||
str r2, [r0], #3
|
||||
#else
|
||||
str r2, [r0]
|
||||
#endif
|
||||
m_pop
|
||||
|
||||
.Lstringcopy_copy1byte:
|
||||
strb r2, [r0]
|
||||
m_pop
|
||||
|
||||
.Lstringcopy_copy2bytes:
|
||||
#if defined(STPCPY)
|
||||
strh r2, [r0], #1
|
||||
#else
|
||||
strh r2, [r0]
|
||||
#endif
|
||||
m_pop
|
||||
|
||||
.Lstringcopy_copy3bytes:
|
||||
strh r2, [r0], #2
|
||||
lsr r2, #16
|
||||
strb r2, [r0]
|
||||
m_pop
|
||||
|
||||
.Lstringcopy_zero_in_second_register:
|
||||
lsls lr, ip, #17
|
||||
bne .Lstringcopy_copy5bytes
|
||||
bcs .Lstringcopy_copy6bytes
|
||||
lsls ip, ip, #1
|
||||
bne .Lstringcopy_copy7bytes
|
||||
|
||||
// Copy 8 bytes to the destination.
|
||||
strd r2, r3, [r0]
|
||||
#if defined(STPCPY)
|
||||
add r0, r0, #7
|
||||
#endif
|
||||
m_pop
|
||||
|
||||
.Lstringcopy_copy5bytes:
|
||||
str r2, [r0], #4
|
||||
strb r3, [r0]
|
||||
m_pop
|
||||
|
||||
.Lstringcopy_copy6bytes:
|
||||
str r2, [r0], #4
|
||||
#if defined(STPCPY)
|
||||
strh r3, [r0], #1
|
||||
#else
|
||||
strh r3, [r0]
|
||||
#endif
|
||||
m_pop
|
||||
|
||||
.Lstringcopy_copy7bytes:
|
||||
str r2, [r0], #4
|
||||
strh r3, [r0], #2
|
||||
lsr r3, #16
|
||||
strb r3, [r0]
|
||||
m_pop
|
||||
|
||||
.Lstringcopy_unaligned_copy:
|
||||
// Dst is aligned to a double word, while src is at an unknown alignment.
|
||||
// There are 7 different versions of the unaligned copy code
|
||||
// to prevent overreading the src. The mainloop of every single version
|
||||
// will store 64 bits per loop. The difference is how much of src can
|
||||
// be read without potentially crossing a page boundary.
|
||||
tbb [pc, r3]
|
||||
.Lstringcopy_unaligned_branchtable:
|
||||
.byte 0
|
||||
.byte ((.Lstringcopy_unalign7 - .Lstringcopy_unaligned_branchtable)/2)
|
||||
.byte ((.Lstringcopy_unalign6 - .Lstringcopy_unaligned_branchtable)/2)
|
||||
.byte ((.Lstringcopy_unalign5 - .Lstringcopy_unaligned_branchtable)/2)
|
||||
.byte ((.Lstringcopy_unalign4 - .Lstringcopy_unaligned_branchtable)/2)
|
||||
.byte ((.Lstringcopy_unalign3 - .Lstringcopy_unaligned_branchtable)/2)
|
||||
.byte ((.Lstringcopy_unalign2 - .Lstringcopy_unaligned_branchtable)/2)
|
||||
.byte ((.Lstringcopy_unalign1 - .Lstringcopy_unaligned_branchtable)/2)
|
||||
|
||||
.p2align 2
|
||||
// Can read 7 bytes before possibly crossing a page.
|
||||
.Lstringcopy_unalign7:
|
||||
ldr r2, [r1], #4
|
||||
|
||||
sub ip, r2, #0x01010101
|
||||
bic ip, ip, r2
|
||||
ands ip, ip, #0x80808080
|
||||
bne .Lstringcopy_zero_in_first_register
|
||||
|
||||
ldrb r3, [r1]
|
||||
cbz r3, .Lstringcopy_unalign7_copy5bytes
|
||||
ldrb r4, [r1, #1]
|
||||
cbz r4, .Lstringcopy_unalign7_copy6bytes
|
||||
ldrb r5, [r1, #2]
|
||||
cbz r5, .Lstringcopy_unalign7_copy7bytes
|
||||
|
||||
ldr r3, [r1], #4
|
||||
pld [r1, #64]
|
||||
|
||||
lsrs ip, r3, #24
|
||||
strd r2, r3, [r0], #8
|
||||
#if defined(STPCPY)
|
||||
beq .Lstringcopy_finish
|
||||
#else
|
||||
beq .Lstringcopy_unalign_return
|
||||
#endif
|
||||
b .Lstringcopy_unalign7
|
||||
|
||||
.Lstringcopy_unalign7_copy5bytes:
|
||||
str r2, [r0], #4
|
||||
strb r3, [r0]
|
||||
.Lstringcopy_unalign_return:
|
||||
m_pop
|
||||
|
||||
.Lstringcopy_unalign7_copy6bytes:
|
||||
str r2, [r0], #4
|
||||
strb r3, [r0], #1
|
||||
strb r4, [r0]
|
||||
m_pop
|
||||
|
||||
.Lstringcopy_unalign7_copy7bytes:
|
||||
str r2, [r0], #4
|
||||
strb r3, [r0], #1
|
||||
strb r4, [r0], #1
|
||||
strb r5, [r0]
|
||||
m_pop
|
||||
|
||||
.p2align 2
|
||||
// Can read 6 bytes before possibly crossing a page.
|
||||
.Lstringcopy_unalign6:
|
||||
ldr r2, [r1], #4
|
||||
|
||||
sub ip, r2, #0x01010101
|
||||
bic ip, ip, r2
|
||||
ands ip, ip, #0x80808080
|
||||
bne .Lstringcopy_zero_in_first_register
|
||||
|
||||
ldrb r4, [r1]
|
||||
cbz r4, .Lstringcopy_unalign_copy5bytes
|
||||
ldrb r5, [r1, #1]
|
||||
cbz r5, .Lstringcopy_unalign_copy6bytes
|
||||
|
||||
ldr r3, [r1], #4
|
||||
pld [r1, #64]
|
||||
|
||||
tst r3, #0xff0000
|
||||
beq .Lstringcopy_copy7bytes
|
||||
lsrs ip, r3, #24
|
||||
strd r2, r3, [r0], #8
|
||||
#if defined(STPCPY)
|
||||
beq .Lstringcopy_finish
|
||||
#else
|
||||
beq .Lstringcopy_unalign_return
|
||||
#endif
|
||||
b .Lstringcopy_unalign6
|
||||
|
||||
.p2align 2
|
||||
// Can read 5 bytes before possibly crossing a page.
|
||||
.Lstringcopy_unalign5:
|
||||
ldr r2, [r1], #4
|
||||
|
||||
sub ip, r2, #0x01010101
|
||||
bic ip, ip, r2
|
||||
ands ip, ip, #0x80808080
|
||||
bne .Lstringcopy_zero_in_first_register
|
||||
|
||||
ldrb r4, [r1]
|
||||
cbz r4, .Lstringcopy_unalign_copy5bytes
|
||||
|
||||
ldr r3, [r1], #4
|
||||
|
||||
pld [r1, #64]
|
||||
|
||||
sub ip, r3, #0x01010101
|
||||
bic ip, ip, r3
|
||||
ands ip, ip, #0x80808080
|
||||
bne .Lstringcopy_zero_in_second_register
|
||||
|
||||
strd r2, r3, [r0], #8
|
||||
b .Lstringcopy_unalign5
|
||||
|
||||
.Lstringcopy_unalign_copy5bytes:
|
||||
str r2, [r0], #4
|
||||
strb r4, [r0]
|
||||
m_pop
|
||||
|
||||
.Lstringcopy_unalign_copy6bytes:
|
||||
str r2, [r0], #4
|
||||
strb r4, [r0], #1
|
||||
strb r5, [r0]
|
||||
m_pop
|
||||
|
||||
.p2align 2
|
||||
// Can read 4 bytes before possibly crossing a page.
|
||||
.Lstringcopy_unalign4:
|
||||
ldr r2, [r1], #4
|
||||
|
||||
sub ip, r2, #0x01010101
|
||||
bic ip, ip, r2
|
||||
ands ip, ip, #0x80808080
|
||||
bne .Lstringcopy_zero_in_first_register
|
||||
|
||||
ldr r3, [r1], #4
|
||||
pld [r1, #64]
|
||||
|
||||
sub ip, r3, #0x01010101
|
||||
bic ip, ip, r3
|
||||
ands ip, ip, #0x80808080
|
||||
bne .Lstringcopy_zero_in_second_register
|
||||
|
||||
strd r2, r3, [r0], #8
|
||||
b .Lstringcopy_unalign4
|
||||
|
||||
.p2align 2
|
||||
// Can read 3 bytes before possibly crossing a page.
|
||||
.Lstringcopy_unalign3:
|
||||
ldrb r2, [r1]
|
||||
cbz r2, .Lstringcopy_unalign3_copy1byte
|
||||
ldrb r3, [r1, #1]
|
||||
cbz r3, .Lstringcopy_unalign3_copy2bytes
|
||||
ldrb r4, [r1, #2]
|
||||
cbz r4, .Lstringcopy_unalign3_copy3bytes
|
||||
|
||||
ldr r2, [r1], #4
|
||||
ldr r3, [r1], #4
|
||||
|
||||
pld [r1, #64]
|
||||
|
||||
lsrs lr, r2, #24
|
||||
beq .Lstringcopy_copy4bytes
|
||||
|
||||
sub ip, r3, #0x01010101
|
||||
bic ip, ip, r3
|
||||
ands ip, ip, #0x80808080
|
||||
bne .Lstringcopy_zero_in_second_register
|
||||
|
||||
strd r2, r3, [r0], #8
|
||||
b .Lstringcopy_unalign3
|
||||
|
||||
.Lstringcopy_unalign3_copy1byte:
|
||||
strb r2, [r0]
|
||||
m_pop
|
||||
|
||||
.Lstringcopy_unalign3_copy2bytes:
|
||||
strb r2, [r0], #1
|
||||
strb r3, [r0]
|
||||
m_pop
|
||||
|
||||
.Lstringcopy_unalign3_copy3bytes:
|
||||
strb r2, [r0], #1
|
||||
strb r3, [r0], #1
|
||||
strb r4, [r0]
|
||||
m_pop
|
||||
|
||||
.p2align 2
|
||||
// Can read 2 bytes before possibly crossing a page.
|
||||
.Lstringcopy_unalign2:
|
||||
ldrb r2, [r1]
|
||||
cbz r2, .Lstringcopy_unalign_copy1byte
|
||||
ldrb r4, [r1, #1]
|
||||
cbz r4, .Lstringcopy_unalign_copy2bytes
|
||||
|
||||
ldr r2, [r1], #4
|
||||
ldr r3, [r1], #4
|
||||
pld [r1, #64]
|
||||
|
||||
tst r2, #0xff0000
|
||||
beq .Lstringcopy_copy3bytes
|
||||
lsrs ip, r2, #24
|
||||
beq .Lstringcopy_copy4bytes
|
||||
|
||||
sub ip, r3, #0x01010101
|
||||
bic ip, ip, r3
|
||||
ands ip, ip, #0x80808080
|
||||
bne .Lstringcopy_zero_in_second_register
|
||||
|
||||
strd r2, r3, [r0], #8
|
||||
b .Lstringcopy_unalign2
|
||||
|
||||
.p2align 2
|
||||
// Can read 1 byte before possibly crossing a page.
|
||||
.Lstringcopy_unalign1:
|
||||
ldrb r2, [r1]
|
||||
cbz r2, .Lstringcopy_unalign_copy1byte
|
||||
|
||||
ldr r2, [r1], #4
|
||||
ldr r3, [r1], #4
|
||||
|
||||
pld [r1, #64]
|
||||
|
||||
sub ip, r2, #0x01010101
|
||||
bic ip, ip, r2
|
||||
ands ip, ip, #0x80808080
|
||||
bne .Lstringcopy_zero_in_first_register
|
||||
|
||||
sub ip, r3, #0x01010101
|
||||
bic ip, ip, r3
|
||||
ands ip, ip, #0x80808080
|
||||
bne .Lstringcopy_zero_in_second_register
|
||||
|
||||
strd r2, r3, [r0], #8
|
||||
b .Lstringcopy_unalign1
|
||||
|
||||
.Lstringcopy_unalign_copy1byte:
|
||||
strb r2, [r0]
|
||||
m_pop
|
||||
|
||||
.Lstringcopy_unalign_copy2bytes:
|
||||
strb r2, [r0], #1
|
||||
strb r4, [r0]
|
||||
m_pop
|
||||
#if defined(STPCPY)
|
||||
END(stpcpy)
|
||||
#else
|
||||
END(strcpy)
|
||||
#endif
|
||||
@@ -1,10 +1,11 @@
|
||||
libc_bionic_src_files_arm += \
|
||||
arch-arm/cortex-a15/bionic/memcpy.S \
|
||||
arch-arm/cortex-a15/bionic/memset.S \
|
||||
arch-arm/cortex-a15/bionic/stpcpy.S \
|
||||
arch-arm/cortex-a15/bionic/strcat.S \
|
||||
arch-arm/cortex-a15/bionic/__strcat_chk.S \
|
||||
arch-arm/cortex-a15/bionic/strcmp.S \
|
||||
arch-arm/cortex-a15/bionic/strcpy.S \
|
||||
arch-arm/cortex-a15/bionic/strlen.S \
|
||||
arch-arm/cortex-a15/bionic/__strcat_chk.S \
|
||||
arch-arm/cortex-a15/bionic/__strcpy_chk.S \
|
||||
arch-arm/cortex-a15/bionic/strlen.S \
|
||||
bionic/memmove.c \
|
||||
|
||||
30
libc/arch-arm/cortex-a9/bionic/stpcpy.S
Normal file
30
libc/arch-arm/cortex-a9/bionic/stpcpy.S
Normal file
@@ -0,0 +1,30 @@
|
||||
/*
|
||||
* Copyright (C) 2014 The Android Open Source Project
|
||||
* 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.
|
||||
*
|
||||
* 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 OWNER 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.
|
||||
*/
|
||||
|
||||
#define STPCPY
|
||||
#include "string_copy.S"
|
||||
@@ -1,5 +1,5 @@
|
||||
/*
|
||||
* Copyright (C) 2013 The Android Open Source Project
|
||||
* Copyright (C) 2014 The Android Open Source Project
|
||||
* All rights reserved.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
@@ -25,437 +25,6 @@
|
||||
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
||||
* SUCH DAMAGE.
|
||||
*/
|
||||
/*
|
||||
* Copyright (c) 2013 ARM 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:
|
||||
* 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.
|
||||
* 3. The name of the company may not be used to endorse or promote
|
||||
* products derived from this software without specific prior written
|
||||
* permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY ARM LTD ``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 ARM LTD 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 <private/bionic_asm.h>
|
||||
|
||||
.syntax unified
|
||||
|
||||
.thumb
|
||||
.thumb_func
|
||||
|
||||
.macro m_push
|
||||
push {r0, r4, r5, lr}
|
||||
.cfi_def_cfa_offset 16
|
||||
.cfi_rel_offset r0, 0
|
||||
.cfi_rel_offset r4, 4
|
||||
.cfi_rel_offset r5, 8
|
||||
.cfi_rel_offset lr, 12
|
||||
.endm // m_push
|
||||
|
||||
.macro m_ret inst
|
||||
\inst {r0, r4, r5, pc}
|
||||
.endm // m_ret
|
||||
|
||||
.macro m_copy_byte reg, cmd, label
|
||||
ldrb \reg, [r1], #1
|
||||
strb \reg, [r0], #1
|
||||
\cmd \reg, \label
|
||||
.endm // m_copy_byte
|
||||
|
||||
ENTRY(strcpy)
|
||||
// Unroll the first 8 bytes that will be copied.
|
||||
m_push
|
||||
m_copy_byte reg=r2, cmd=cbz, label=.Lstrcpy_finish
|
||||
m_copy_byte reg=r3, cmd=cbz, label=.Lstrcpy_finish
|
||||
m_copy_byte reg=r4, cmd=cbz, label=.Lstrcpy_finish
|
||||
m_copy_byte reg=r5, cmd=cbz, label=.Lstrcpy_finish
|
||||
m_copy_byte reg=r2, cmd=cbz, label=.Lstrcpy_finish
|
||||
m_copy_byte reg=r3, cmd=cbz, label=.Lstrcpy_finish
|
||||
m_copy_byte reg=r4, cmd=cbz, label=.Lstrcpy_finish
|
||||
m_copy_byte reg=r5, cmd=cbnz, label=.Lstrcpy_continue
|
||||
|
||||
.Lstrcpy_finish:
|
||||
m_ret inst=pop
|
||||
|
||||
.Lstrcpy_continue:
|
||||
pld [r1, #0]
|
||||
ands r3, r0, #7
|
||||
bne .Lstrcpy_align_dst
|
||||
|
||||
.Lstrcpy_check_src_align:
|
||||
// At this point dst is aligned to a double word, check if src
|
||||
// is also aligned to a double word.
|
||||
ands r3, r1, #7
|
||||
bne .Lstrcpy_unaligned_copy
|
||||
|
||||
.p2align 2
|
||||
.Lstrcpy_mainloop:
|
||||
ldmia r1!, {r2, r3}
|
||||
|
||||
pld [r1, #64]
|
||||
|
||||
sub ip, r2, #0x01010101
|
||||
bic ip, ip, r2
|
||||
ands ip, ip, #0x80808080
|
||||
bne .Lstrcpy_zero_in_first_register
|
||||
|
||||
sub ip, r3, #0x01010101
|
||||
bic ip, ip, r3
|
||||
ands ip, ip, #0x80808080
|
||||
bne .Lstrcpy_zero_in_second_register
|
||||
|
||||
stmia r0!, {r2, r3}
|
||||
b .Lstrcpy_mainloop
|
||||
|
||||
.Lstrcpy_zero_in_first_register:
|
||||
lsls lr, ip, #17
|
||||
itt ne
|
||||
strbne r2, [r0]
|
||||
m_ret inst=popne
|
||||
itt cs
|
||||
strhcs r2, [r0]
|
||||
m_ret inst=popcs
|
||||
lsls ip, ip, #1
|
||||
itt eq
|
||||
streq r2, [r0]
|
||||
m_ret inst=popeq
|
||||
strh r2, [r0], #2
|
||||
lsr r3, r2, #16
|
||||
strb r3, [r0]
|
||||
m_ret inst=pop
|
||||
|
||||
.Lstrcpy_zero_in_second_register:
|
||||
lsls lr, ip, #17
|
||||
ittt ne
|
||||
stmiane r0!, {r2}
|
||||
strbne r3, [r0]
|
||||
m_ret inst=popne
|
||||
ittt cs
|
||||
strcs r2, [r0], #4
|
||||
strhcs r3, [r0]
|
||||
m_ret inst=popcs
|
||||
lsls ip, ip, #1
|
||||
itt eq
|
||||
stmiaeq r0, {r2, r3}
|
||||
m_ret inst=popeq
|
||||
stmia r0!, {r2}
|
||||
strh r3, [r0], #2
|
||||
lsr r4, r3, #16
|
||||
strb r4, [r0]
|
||||
m_ret inst=pop
|
||||
|
||||
.Lstrcpy_align_dst:
|
||||
// Align to a double word (64 bits).
|
||||
rsb r3, r3, #8
|
||||
lsls ip, r3, #31
|
||||
beq .Lstrcpy_align_to_32
|
||||
|
||||
ldrb r2, [r1], #1
|
||||
strb r2, [r0], #1
|
||||
cbz r2, .Lstrcpy_complete
|
||||
|
||||
.Lstrcpy_align_to_32:
|
||||
bcc .Lstrcpy_align_to_64
|
||||
|
||||
ldrb r4, [r1], #1
|
||||
strb r4, [r0], #1
|
||||
cmp r4, #0
|
||||
it eq
|
||||
m_ret inst=popeq
|
||||
ldrb r5, [r1], #1
|
||||
strb r5, [r0], #1
|
||||
cmp r5, #0
|
||||
it eq
|
||||
m_ret inst=popeq
|
||||
|
||||
.Lstrcpy_align_to_64:
|
||||
tst r3, #4
|
||||
beq .Lstrcpy_check_src_align
|
||||
ldr r2, [r1], #4
|
||||
|
||||
sub ip, r2, #0x01010101
|
||||
bic ip, ip, r2
|
||||
ands ip, ip, #0x80808080
|
||||
bne .Lstrcpy_zero_in_first_register
|
||||
stmia r0!, {r2}
|
||||
b .Lstrcpy_check_src_align
|
||||
|
||||
.Lstrcpy_complete:
|
||||
m_ret inst=pop
|
||||
|
||||
.Lstrcpy_unaligned_copy:
|
||||
// Dst is aligned to a double word, while src is at an unknown alignment.
|
||||
// There are 7 different versions of the unaligned copy code
|
||||
// to prevent overreading the src. The mainloop of every single version
|
||||
// will store 64 bits per loop. The difference is how much of src can
|
||||
// be read without potentially crossing a page boundary.
|
||||
tbb [pc, r3]
|
||||
.Lstrcpy_unaligned_branchtable:
|
||||
.byte 0
|
||||
.byte ((.Lstrcpy_unalign7 - .Lstrcpy_unaligned_branchtable)/2)
|
||||
.byte ((.Lstrcpy_unalign6 - .Lstrcpy_unaligned_branchtable)/2)
|
||||
.byte ((.Lstrcpy_unalign5 - .Lstrcpy_unaligned_branchtable)/2)
|
||||
.byte ((.Lstrcpy_unalign4 - .Lstrcpy_unaligned_branchtable)/2)
|
||||
.byte ((.Lstrcpy_unalign3 - .Lstrcpy_unaligned_branchtable)/2)
|
||||
.byte ((.Lstrcpy_unalign2 - .Lstrcpy_unaligned_branchtable)/2)
|
||||
.byte ((.Lstrcpy_unalign1 - .Lstrcpy_unaligned_branchtable)/2)
|
||||
|
||||
.p2align 2
|
||||
// Can read 7 bytes before possibly crossing a page.
|
||||
.Lstrcpy_unalign7:
|
||||
ldr r2, [r1], #4
|
||||
|
||||
sub ip, r2, #0x01010101
|
||||
bic ip, ip, r2
|
||||
ands ip, ip, #0x80808080
|
||||
bne .Lstrcpy_zero_in_first_register
|
||||
|
||||
ldrb r3, [r1]
|
||||
cbz r3, .Lstrcpy_unalign7_copy5bytes
|
||||
ldrb r4, [r1, #1]
|
||||
cbz r4, .Lstrcpy_unalign7_copy6bytes
|
||||
ldrb r5, [r1, #2]
|
||||
cbz r5, .Lstrcpy_unalign7_copy7bytes
|
||||
|
||||
ldr r3, [r1], #4
|
||||
pld [r1, #64]
|
||||
|
||||
lsrs ip, r3, #24
|
||||
stmia r0!, {r2, r3}
|
||||
beq .Lstrcpy_unalign_return
|
||||
b .Lstrcpy_unalign7
|
||||
|
||||
.Lstrcpy_unalign7_copy5bytes:
|
||||
stmia r0!, {r2}
|
||||
strb r3, [r0]
|
||||
.Lstrcpy_unalign_return:
|
||||
m_ret inst=pop
|
||||
|
||||
.Lstrcpy_unalign7_copy6bytes:
|
||||
stmia r0!, {r2}
|
||||
strb r3, [r0], #1
|
||||
strb r4, [r0], #1
|
||||
m_ret inst=pop
|
||||
|
||||
.Lstrcpy_unalign7_copy7bytes:
|
||||
stmia r0!, {r2}
|
||||
strb r3, [r0], #1
|
||||
strb r4, [r0], #1
|
||||
strb r5, [r0], #1
|
||||
m_ret inst=pop
|
||||
|
||||
.p2align 2
|
||||
// Can read 6 bytes before possibly crossing a page.
|
||||
.Lstrcpy_unalign6:
|
||||
ldr r2, [r1], #4
|
||||
|
||||
sub ip, r2, #0x01010101
|
||||
bic ip, ip, r2
|
||||
ands ip, ip, #0x80808080
|
||||
bne .Lstrcpy_zero_in_first_register
|
||||
|
||||
ldrb r4, [r1]
|
||||
cbz r4, .Lstrcpy_unalign_copy5bytes
|
||||
ldrb r5, [r1, #1]
|
||||
cbz r5, .Lstrcpy_unalign_copy6bytes
|
||||
|
||||
ldr r3, [r1], #4
|
||||
pld [r1, #64]
|
||||
|
||||
tst r3, #0xff0000
|
||||
beq .Lstrcpy_unalign6_copy7bytes
|
||||
lsrs ip, r3, #24
|
||||
stmia r0!, {r2, r3}
|
||||
beq .Lstrcpy_unalign_return
|
||||
b .Lstrcpy_unalign6
|
||||
|
||||
.Lstrcpy_unalign6_copy7bytes:
|
||||
stmia r0!, {r2}
|
||||
strh r3, [r0], #2
|
||||
lsr r3, #16
|
||||
strb r3, [r0]
|
||||
m_ret inst=pop
|
||||
|
||||
.p2align 2
|
||||
// Can read 5 bytes before possibly crossing a page.
|
||||
.Lstrcpy_unalign5:
|
||||
ldr r2, [r1], #4
|
||||
|
||||
sub ip, r2, #0x01010101
|
||||
bic ip, ip, r2
|
||||
ands ip, ip, #0x80808080
|
||||
bne .Lstrcpy_zero_in_first_register
|
||||
|
||||
ldrb r4, [r1]
|
||||
cbz r4, .Lstrcpy_unalign_copy5bytes
|
||||
|
||||
ldr r3, [r1], #4
|
||||
|
||||
pld [r1, #64]
|
||||
|
||||
sub ip, r3, #0x01010101
|
||||
bic ip, ip, r3
|
||||
ands ip, ip, #0x80808080
|
||||
bne .Lstrcpy_zero_in_second_register
|
||||
|
||||
stmia r0!, {r2, r3}
|
||||
b .Lstrcpy_unalign5
|
||||
|
||||
.Lstrcpy_unalign_copy5bytes:
|
||||
stmia r0!, {r2}
|
||||
strb r4, [r0]
|
||||
m_ret inst=pop
|
||||
|
||||
.Lstrcpy_unalign_copy6bytes:
|
||||
stmia r0!, {r2}
|
||||
strb r4, [r0], #1
|
||||
strb r5, [r0]
|
||||
m_ret inst=pop
|
||||
|
||||
.p2align 2
|
||||
// Can read 4 bytes before possibly crossing a page.
|
||||
.Lstrcpy_unalign4:
|
||||
ldmia r1!, {r2}
|
||||
|
||||
sub ip, r2, #0x01010101
|
||||
bic ip, ip, r2
|
||||
ands ip, ip, #0x80808080
|
||||
bne .Lstrcpy_zero_in_first_register
|
||||
|
||||
ldmia r1!, {r3}
|
||||
pld [r1, #64]
|
||||
|
||||
sub ip, r3, #0x01010101
|
||||
bic ip, ip, r3
|
||||
ands ip, ip, #0x80808080
|
||||
bne .Lstrcpy_zero_in_second_register
|
||||
|
||||
stmia r0!, {r2, r3}
|
||||
b .Lstrcpy_unalign4
|
||||
|
||||
.p2align 2
|
||||
// Can read 3 bytes before possibly crossing a page.
|
||||
.Lstrcpy_unalign3:
|
||||
ldrb r2, [r1]
|
||||
cbz r2, .Lstrcpy_unalign3_copy1byte
|
||||
ldrb r3, [r1, #1]
|
||||
cbz r3, .Lstrcpy_unalign3_copy2bytes
|
||||
ldrb r4, [r1, #2]
|
||||
cbz r4, .Lstrcpy_unalign3_copy3bytes
|
||||
|
||||
ldr r2, [r1], #4
|
||||
ldr r3, [r1], #4
|
||||
|
||||
pld [r1, #64]
|
||||
|
||||
lsrs lr, r2, #24
|
||||
beq .Lstrcpy_unalign_copy4bytes
|
||||
|
||||
sub ip, r3, #0x01010101
|
||||
bic ip, ip, r3
|
||||
ands ip, ip, #0x80808080
|
||||
bne .Lstrcpy_zero_in_second_register
|
||||
|
||||
stmia r0!, {r2, r3}
|
||||
b .Lstrcpy_unalign3
|
||||
|
||||
.Lstrcpy_unalign3_copy1byte:
|
||||
strb r2, [r0]
|
||||
m_ret inst=pop
|
||||
|
||||
.Lstrcpy_unalign3_copy2bytes:
|
||||
strb r2, [r0], #1
|
||||
strb r3, [r0]
|
||||
m_ret inst=pop
|
||||
|
||||
.Lstrcpy_unalign3_copy3bytes:
|
||||
strb r2, [r0], #1
|
||||
strb r3, [r0], #1
|
||||
strb r4, [r0]
|
||||
m_ret inst=pop
|
||||
|
||||
.p2align 2
|
||||
// Can read 2 bytes before possibly crossing a page.
|
||||
.Lstrcpy_unalign2:
|
||||
ldrb r2, [r1]
|
||||
cbz r2, .Lstrcpy_unalign_copy1byte
|
||||
ldrb r3, [r1, #1]
|
||||
cbz r3, .Lstrcpy_unalign_copy2bytes
|
||||
|
||||
ldr r2, [r1], #4
|
||||
ldr r3, [r1], #4
|
||||
pld [r1, #64]
|
||||
|
||||
tst r2, #0xff0000
|
||||
beq .Lstrcpy_unalign_copy3bytes
|
||||
lsrs ip, r2, #24
|
||||
beq .Lstrcpy_unalign_copy4bytes
|
||||
|
||||
sub ip, r3, #0x01010101
|
||||
bic ip, ip, r3
|
||||
ands ip, ip, #0x80808080
|
||||
bne .Lstrcpy_zero_in_second_register
|
||||
|
||||
stmia r0!, {r2, r3}
|
||||
b .Lstrcpy_unalign2
|
||||
|
||||
.p2align 2
|
||||
// Can read 1 byte before possibly crossing a page.
|
||||
.Lstrcpy_unalign1:
|
||||
ldrb r2, [r1]
|
||||
cbz r2, .Lstrcpy_unalign_copy1byte
|
||||
|
||||
ldr r2, [r1], #4
|
||||
ldr r3, [r1], #4
|
||||
|
||||
pld [r1, #64]
|
||||
|
||||
sub ip, r2, #0x01010101
|
||||
bic ip, ip, r2
|
||||
ands ip, ip, #0x80808080
|
||||
bne .Lstrcpy_zero_in_first_register
|
||||
|
||||
sub ip, r3, #0x01010101
|
||||
bic ip, ip, r3
|
||||
ands ip, ip, #0x80808080
|
||||
bne .Lstrcpy_zero_in_second_register
|
||||
|
||||
stmia r0!, {r2, r3}
|
||||
b .Lstrcpy_unalign1
|
||||
|
||||
.Lstrcpy_unalign_copy1byte:
|
||||
strb r2, [r0]
|
||||
m_ret inst=pop
|
||||
|
||||
.Lstrcpy_unalign_copy2bytes:
|
||||
strb r2, [r0], #1
|
||||
strb r3, [r0]
|
||||
m_ret inst=pop
|
||||
|
||||
.Lstrcpy_unalign_copy3bytes:
|
||||
strh r2, [r0], #2
|
||||
lsr r2, #16
|
||||
strb r2, [r0]
|
||||
m_ret inst=pop
|
||||
|
||||
.Lstrcpy_unalign_copy4bytes:
|
||||
stmia r0, {r2}
|
||||
m_ret inst=pop
|
||||
END(strcpy)
|
||||
#define STRCPY
|
||||
#include "string_copy.S"
|
||||
|
||||
535
libc/arch-arm/cortex-a9/bionic/string_copy.S
Normal file
535
libc/arch-arm/cortex-a9/bionic/string_copy.S
Normal file
@@ -0,0 +1,535 @@
|
||||
/*
|
||||
* Copyright (C) 2013 The Android Open Source Project
|
||||
* 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.
|
||||
*
|
||||
* 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 OWNER 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.
|
||||
*/
|
||||
/*
|
||||
* Copyright (c) 2013 ARM 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:
|
||||
* 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.
|
||||
* 3. The name of the company may not be used to endorse or promote
|
||||
* products derived from this software without specific prior written
|
||||
* permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY ARM LTD ``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 ARM LTD 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.
|
||||
*/
|
||||
|
||||
#if !defined(STPCPY) && !defined(STRCPY)
|
||||
#error "Either STPCPY or STRCPY must be defined."
|
||||
#endif
|
||||
|
||||
#include <private/bionic_asm.h>
|
||||
|
||||
.syntax unified
|
||||
|
||||
.thumb
|
||||
.thumb_func
|
||||
|
||||
#if defined(STPCPY)
|
||||
.macro m_push
|
||||
push {r4, r5, lr}
|
||||
.cfi_def_cfa_offset 12
|
||||
.cfi_rel_offset r4, 0
|
||||
.cfi_rel_offset r5, 4
|
||||
.cfi_rel_offset lr, 8
|
||||
.endm // m_push
|
||||
#else
|
||||
.macro m_push
|
||||
push {r0, r4, r5, lr}
|
||||
.cfi_def_cfa_offset 16
|
||||
.cfi_rel_offset r0, 0
|
||||
.cfi_rel_offset r4, 4
|
||||
.cfi_rel_offset r5, 8
|
||||
.cfi_rel_offset lr, 12
|
||||
.endm // m_push
|
||||
#endif
|
||||
|
||||
#if defined(STPCPY)
|
||||
.macro m_ret inst
|
||||
\inst {r4, r5, pc}
|
||||
.endm // m_ret
|
||||
#else
|
||||
.macro m_ret inst
|
||||
\inst {r0, r4, r5, pc}
|
||||
.endm // m_ret
|
||||
#endif
|
||||
|
||||
.macro m_copy_byte reg, cmd, label
|
||||
ldrb \reg, [r1], #1
|
||||
strb \reg, [r0], #1
|
||||
\cmd \reg, \label
|
||||
.endm // m_copy_byte
|
||||
|
||||
#if defined(STPCPY)
|
||||
ENTRY(stpcpy)
|
||||
#else
|
||||
ENTRY(strcpy)
|
||||
#endif
|
||||
// Unroll the first 8 bytes that will be copied.
|
||||
m_push
|
||||
m_copy_byte reg=r2, cmd=cbz, label=.Lstringcopy_finish
|
||||
m_copy_byte reg=r3, cmd=cbz, label=.Lstringcopy_finish
|
||||
m_copy_byte reg=r4, cmd=cbz, label=.Lstringcopy_finish
|
||||
m_copy_byte reg=r5, cmd=cbz, label=.Lstringcopy_finish
|
||||
m_copy_byte reg=r2, cmd=cbz, label=.Lstringcopy_finish
|
||||
m_copy_byte reg=r3, cmd=cbz, label=.Lstringcopy_finish
|
||||
m_copy_byte reg=r4, cmd=cbz, label=.Lstringcopy_finish
|
||||
m_copy_byte reg=r5, cmd=cbnz, label=.Lstringcopy_continue
|
||||
|
||||
.Lstringcopy_finish:
|
||||
#if defined(STPCPY)
|
||||
sub r0, r0, #1
|
||||
#endif
|
||||
m_ret inst=pop
|
||||
|
||||
.Lstringcopy_continue:
|
||||
pld [r1, #0]
|
||||
ands r3, r0, #7
|
||||
bne .Lstringcopy_align_dst
|
||||
|
||||
.Lstringcopy_check_src_align:
|
||||
// At this point dst is aligned to a double word, check if src
|
||||
// is also aligned to a double word.
|
||||
ands r3, r1, #7
|
||||
bne .Lstringcopy_unaligned_copy
|
||||
|
||||
.p2align 2
|
||||
.Lstringcopy_mainloop:
|
||||
ldmia r1!, {r2, r3}
|
||||
|
||||
pld [r1, #64]
|
||||
|
||||
sub ip, r2, #0x01010101
|
||||
bic ip, ip, r2
|
||||
ands ip, ip, #0x80808080
|
||||
bne .Lstringcopy_zero_in_first_register
|
||||
|
||||
sub ip, r3, #0x01010101
|
||||
bic ip, ip, r3
|
||||
ands ip, ip, #0x80808080
|
||||
bne .Lstringcopy_zero_in_second_register
|
||||
|
||||
stmia r0!, {r2, r3}
|
||||
b .Lstringcopy_mainloop
|
||||
|
||||
.Lstringcopy_zero_in_first_register:
|
||||
lsls lr, ip, #17
|
||||
itt ne
|
||||
strbne r2, [r0]
|
||||
m_ret inst=popne
|
||||
itt cs
|
||||
#if defined(STPCPY)
|
||||
strhcs r2, [r0], #1
|
||||
#else
|
||||
strhcs r2, [r0]
|
||||
#endif
|
||||
m_ret inst=popcs
|
||||
lsls ip, ip, #1
|
||||
itt eq
|
||||
#if defined(STPCPY)
|
||||
streq r2, [r0], #3
|
||||
#else
|
||||
streq r2, [r0]
|
||||
#endif
|
||||
m_ret inst=popeq
|
||||
strh r2, [r0], #2
|
||||
lsr r3, r2, #16
|
||||
strb r3, [r0]
|
||||
m_ret inst=pop
|
||||
|
||||
.Lstringcopy_zero_in_second_register:
|
||||
lsls lr, ip, #17
|
||||
ittt ne
|
||||
stmiane r0!, {r2}
|
||||
strbne r3, [r0]
|
||||
m_ret inst=popne
|
||||
ittt cs
|
||||
strcs r2, [r0], #4
|
||||
#if defined(STPCPY)
|
||||
strhcs r3, [r0], #1
|
||||
#else
|
||||
strhcs r3, [r0]
|
||||
#endif
|
||||
m_ret inst=popcs
|
||||
lsls ip, ip, #1
|
||||
#if defined(STPCPY)
|
||||
ittt eq
|
||||
#else
|
||||
itt eq
|
||||
#endif
|
||||
stmiaeq r0, {r2, r3}
|
||||
#if defined(STPCPY)
|
||||
addeq r0, r0, #7
|
||||
#endif
|
||||
m_ret inst=popeq
|
||||
stmia r0!, {r2}
|
||||
strh r3, [r0], #2
|
||||
lsr r4, r3, #16
|
||||
strb r4, [r0]
|
||||
m_ret inst=pop
|
||||
|
||||
.Lstringcopy_align_dst:
|
||||
// Align to a double word (64 bits).
|
||||
rsb r3, r3, #8
|
||||
lsls ip, r3, #31
|
||||
beq .Lstringcopy_align_to_32
|
||||
|
||||
ldrb r2, [r1], #1
|
||||
strb r2, [r0], #1
|
||||
cbz r2, .Lstringcopy_complete
|
||||
|
||||
.Lstringcopy_align_to_32:
|
||||
bcc .Lstringcopy_align_to_64
|
||||
|
||||
ldrb r4, [r1], #1
|
||||
strb r4, [r0], #1
|
||||
cmp r4, #0
|
||||
#if defined(STPCPY)
|
||||
itt eq
|
||||
subeq r0, r0, #1
|
||||
#else
|
||||
it eq
|
||||
#endif
|
||||
m_ret inst=popeq
|
||||
ldrb r5, [r1], #1
|
||||
strb r5, [r0], #1
|
||||
cmp r5, #0
|
||||
#if defined(STPCPY)
|
||||
itt eq
|
||||
subeq r0, r0, #1
|
||||
#else
|
||||
it eq
|
||||
#endif
|
||||
m_ret inst=popeq
|
||||
|
||||
.Lstringcopy_align_to_64:
|
||||
tst r3, #4
|
||||
beq .Lstringcopy_check_src_align
|
||||
ldr r2, [r1], #4
|
||||
|
||||
sub ip, r2, #0x01010101
|
||||
bic ip, ip, r2
|
||||
ands ip, ip, #0x80808080
|
||||
bne .Lstringcopy_zero_in_first_register
|
||||
stmia r0!, {r2}
|
||||
b .Lstringcopy_check_src_align
|
||||
|
||||
.Lstringcopy_complete:
|
||||
#if defined(STPCPY)
|
||||
sub r0, r0, #1
|
||||
#endif
|
||||
m_ret inst=pop
|
||||
|
||||
.Lstringcopy_unaligned_copy:
|
||||
// Dst is aligned to a double word, while src is at an unknown alignment.
|
||||
// There are 7 different versions of the unaligned copy code
|
||||
// to prevent overreading the src. The mainloop of every single version
|
||||
// will store 64 bits per loop. The difference is how much of src can
|
||||
// be read without potentially crossing a page boundary.
|
||||
tbb [pc, r3]
|
||||
.Lstringcopy_unaligned_branchtable:
|
||||
.byte 0
|
||||
.byte ((.Lstringcopy_unalign7 - .Lstringcopy_unaligned_branchtable)/2)
|
||||
.byte ((.Lstringcopy_unalign6 - .Lstringcopy_unaligned_branchtable)/2)
|
||||
.byte ((.Lstringcopy_unalign5 - .Lstringcopy_unaligned_branchtable)/2)
|
||||
.byte ((.Lstringcopy_unalign4 - .Lstringcopy_unaligned_branchtable)/2)
|
||||
.byte ((.Lstringcopy_unalign3 - .Lstringcopy_unaligned_branchtable)/2)
|
||||
.byte ((.Lstringcopy_unalign2 - .Lstringcopy_unaligned_branchtable)/2)
|
||||
.byte ((.Lstringcopy_unalign1 - .Lstringcopy_unaligned_branchtable)/2)
|
||||
|
||||
.p2align 2
|
||||
// Can read 7 bytes before possibly crossing a page.
|
||||
.Lstringcopy_unalign7:
|
||||
ldr r2, [r1], #4
|
||||
|
||||
sub ip, r2, #0x01010101
|
||||
bic ip, ip, r2
|
||||
ands ip, ip, #0x80808080
|
||||
bne .Lstringcopy_zero_in_first_register
|
||||
|
||||
ldrb r3, [r1]
|
||||
cbz r3, .Lstringcopy_unalign7_copy5bytes
|
||||
ldrb r4, [r1, #1]
|
||||
cbz r4, .Lstringcopy_unalign7_copy6bytes
|
||||
ldrb r5, [r1, #2]
|
||||
cbz r5, .Lstringcopy_unalign7_copy7bytes
|
||||
|
||||
ldr r3, [r1], #4
|
||||
pld [r1, #64]
|
||||
|
||||
lsrs ip, r3, #24
|
||||
stmia r0!, {r2, r3}
|
||||
#if defined(STPCPY)
|
||||
beq .Lstringcopy_finish
|
||||
#else
|
||||
beq .Lstringcopy_unalign_return
|
||||
#endif
|
||||
b .Lstringcopy_unalign7
|
||||
|
||||
.Lstringcopy_unalign7_copy5bytes:
|
||||
stmia r0!, {r2}
|
||||
strb r3, [r0]
|
||||
.Lstringcopy_unalign_return:
|
||||
m_ret inst=pop
|
||||
|
||||
.Lstringcopy_unalign7_copy6bytes:
|
||||
stmia r0!, {r2}
|
||||
strb r3, [r0], #1
|
||||
strb r4, [r0]
|
||||
m_ret inst=pop
|
||||
|
||||
.Lstringcopy_unalign7_copy7bytes:
|
||||
stmia r0!, {r2}
|
||||
strb r3, [r0], #1
|
||||
strb r4, [r0], #1
|
||||
strb r5, [r0]
|
||||
m_ret inst=pop
|
||||
|
||||
.p2align 2
|
||||
// Can read 6 bytes before possibly crossing a page.
|
||||
.Lstringcopy_unalign6:
|
||||
ldr r2, [r1], #4
|
||||
|
||||
sub ip, r2, #0x01010101
|
||||
bic ip, ip, r2
|
||||
ands ip, ip, #0x80808080
|
||||
bne .Lstringcopy_zero_in_first_register
|
||||
|
||||
ldrb r4, [r1]
|
||||
cbz r4, .Lstringcopy_unalign_copy5bytes
|
||||
ldrb r5, [r1, #1]
|
||||
cbz r5, .Lstringcopy_unalign_copy6bytes
|
||||
|
||||
ldr r3, [r1], #4
|
||||
pld [r1, #64]
|
||||
|
||||
tst r3, #0xff0000
|
||||
beq .Lstringcopy_unalign6_copy7bytes
|
||||
lsrs ip, r3, #24
|
||||
stmia r0!, {r2, r3}
|
||||
#if defined(STPCPY)
|
||||
beq .Lstringcopy_finish
|
||||
#else
|
||||
beq .Lstringcopy_unalign_return
|
||||
#endif
|
||||
b .Lstringcopy_unalign6
|
||||
|
||||
.Lstringcopy_unalign6_copy7bytes:
|
||||
stmia r0!, {r2}
|
||||
strh r3, [r0], #2
|
||||
lsr r3, #16
|
||||
strb r3, [r0]
|
||||
m_ret inst=pop
|
||||
|
||||
.p2align 2
|
||||
// Can read 5 bytes before possibly crossing a page.
|
||||
.Lstringcopy_unalign5:
|
||||
ldr r2, [r1], #4
|
||||
|
||||
sub ip, r2, #0x01010101
|
||||
bic ip, ip, r2
|
||||
ands ip, ip, #0x80808080
|
||||
bne .Lstringcopy_zero_in_first_register
|
||||
|
||||
ldrb r4, [r1]
|
||||
cbz r4, .Lstringcopy_unalign_copy5bytes
|
||||
|
||||
ldr r3, [r1], #4
|
||||
|
||||
pld [r1, #64]
|
||||
|
||||
sub ip, r3, #0x01010101
|
||||
bic ip, ip, r3
|
||||
ands ip, ip, #0x80808080
|
||||
bne .Lstringcopy_zero_in_second_register
|
||||
|
||||
stmia r0!, {r2, r3}
|
||||
b .Lstringcopy_unalign5
|
||||
|
||||
.Lstringcopy_unalign_copy5bytes:
|
||||
stmia r0!, {r2}
|
||||
strb r4, [r0]
|
||||
m_ret inst=pop
|
||||
|
||||
.Lstringcopy_unalign_copy6bytes:
|
||||
stmia r0!, {r2}
|
||||
strb r4, [r0], #1
|
||||
strb r5, [r0]
|
||||
m_ret inst=pop
|
||||
|
||||
.p2align 2
|
||||
// Can read 4 bytes before possibly crossing a page.
|
||||
.Lstringcopy_unalign4:
|
||||
ldmia r1!, {r2}
|
||||
|
||||
sub ip, r2, #0x01010101
|
||||
bic ip, ip, r2
|
||||
ands ip, ip, #0x80808080
|
||||
bne .Lstringcopy_zero_in_first_register
|
||||
|
||||
ldmia r1!, {r3}
|
||||
pld [r1, #64]
|
||||
|
||||
sub ip, r3, #0x01010101
|
||||
bic ip, ip, r3
|
||||
ands ip, ip, #0x80808080
|
||||
bne .Lstringcopy_zero_in_second_register
|
||||
|
||||
stmia r0!, {r2, r3}
|
||||
b .Lstringcopy_unalign4
|
||||
|
||||
.p2align 2
|
||||
// Can read 3 bytes before possibly crossing a page.
|
||||
.Lstringcopy_unalign3:
|
||||
ldrb r2, [r1]
|
||||
cbz r2, .Lstringcopy_unalign3_copy1byte
|
||||
ldrb r3, [r1, #1]
|
||||
cbz r3, .Lstringcopy_unalign3_copy2bytes
|
||||
ldrb r4, [r1, #2]
|
||||
cbz r4, .Lstringcopy_unalign3_copy3bytes
|
||||
|
||||
ldr r2, [r1], #4
|
||||
ldr r3, [r1], #4
|
||||
|
||||
pld [r1, #64]
|
||||
|
||||
lsrs lr, r2, #24
|
||||
beq .Lstringcopy_unalign_copy4bytes
|
||||
|
||||
sub ip, r3, #0x01010101
|
||||
bic ip, ip, r3
|
||||
ands ip, ip, #0x80808080
|
||||
bne .Lstringcopy_zero_in_second_register
|
||||
|
||||
stmia r0!, {r2, r3}
|
||||
b .Lstringcopy_unalign3
|
||||
|
||||
.Lstringcopy_unalign3_copy1byte:
|
||||
strb r2, [r0]
|
||||
m_ret inst=pop
|
||||
|
||||
.Lstringcopy_unalign3_copy2bytes:
|
||||
strb r2, [r0], #1
|
||||
strb r3, [r0]
|
||||
m_ret inst=pop
|
||||
|
||||
.Lstringcopy_unalign3_copy3bytes:
|
||||
strb r2, [r0], #1
|
||||
strb r3, [r0], #1
|
||||
strb r4, [r0]
|
||||
m_ret inst=pop
|
||||
|
||||
.p2align 2
|
||||
// Can read 2 bytes before possibly crossing a page.
|
||||
.Lstringcopy_unalign2:
|
||||
ldrb r2, [r1]
|
||||
cbz r2, .Lstringcopy_unalign_copy1byte
|
||||
ldrb r3, [r1, #1]
|
||||
cbz r3, .Lstringcopy_unalign_copy2bytes
|
||||
|
||||
ldr r2, [r1], #4
|
||||
ldr r3, [r1], #4
|
||||
pld [r1, #64]
|
||||
|
||||
tst r2, #0xff0000
|
||||
beq .Lstringcopy_unalign_copy3bytes
|
||||
lsrs ip, r2, #24
|
||||
beq .Lstringcopy_unalign_copy4bytes
|
||||
|
||||
sub ip, r3, #0x01010101
|
||||
bic ip, ip, r3
|
||||
ands ip, ip, #0x80808080
|
||||
bne .Lstringcopy_zero_in_second_register
|
||||
|
||||
stmia r0!, {r2, r3}
|
||||
b .Lstringcopy_unalign2
|
||||
|
||||
.p2align 2
|
||||
// Can read 1 byte before possibly crossing a page.
|
||||
.Lstringcopy_unalign1:
|
||||
ldrb r2, [r1]
|
||||
cbz r2, .Lstringcopy_unalign_copy1byte
|
||||
|
||||
ldr r2, [r1], #4
|
||||
ldr r3, [r1], #4
|
||||
|
||||
pld [r1, #64]
|
||||
|
||||
sub ip, r2, #0x01010101
|
||||
bic ip, ip, r2
|
||||
ands ip, ip, #0x80808080
|
||||
bne .Lstringcopy_zero_in_first_register
|
||||
|
||||
sub ip, r3, #0x01010101
|
||||
bic ip, ip, r3
|
||||
ands ip, ip, #0x80808080
|
||||
bne .Lstringcopy_zero_in_second_register
|
||||
|
||||
stmia r0!, {r2, r3}
|
||||
b .Lstringcopy_unalign1
|
||||
|
||||
.Lstringcopy_unalign_copy1byte:
|
||||
strb r2, [r0]
|
||||
m_ret inst=pop
|
||||
|
||||
.Lstringcopy_unalign_copy2bytes:
|
||||
strb r2, [r0], #1
|
||||
strb r3, [r0]
|
||||
m_ret inst=pop
|
||||
|
||||
.Lstringcopy_unalign_copy3bytes:
|
||||
strh r2, [r0], #2
|
||||
lsr r2, #16
|
||||
strb r2, [r0]
|
||||
m_ret inst=pop
|
||||
|
||||
.Lstringcopy_unalign_copy4bytes:
|
||||
stmia r0, {r2}
|
||||
#if defined(STPCPY)
|
||||
add r0, r0, #3
|
||||
#endif
|
||||
m_ret inst=pop
|
||||
#if defined(STPCPY)
|
||||
END(stpcpy)
|
||||
#else
|
||||
END(strcpy)
|
||||
#endif
|
||||
@@ -1,10 +1,11 @@
|
||||
libc_bionic_src_files_arm += \
|
||||
arch-arm/cortex-a9/bionic/memcpy.S \
|
||||
arch-arm/cortex-a9/bionic/memset.S \
|
||||
arch-arm/cortex-a9/bionic/stpcpy.S \
|
||||
arch-arm/cortex-a9/bionic/strcat.S \
|
||||
arch-arm/cortex-a9/bionic/__strcat_chk.S \
|
||||
arch-arm/cortex-a9/bionic/strcmp.S \
|
||||
arch-arm/cortex-a9/bionic/strcpy.S \
|
||||
arch-arm/cortex-a9/bionic/strlen.S \
|
||||
arch-arm/cortex-a9/bionic/__strcat_chk.S \
|
||||
arch-arm/cortex-a9/bionic/__strcpy_chk.S \
|
||||
arch-arm/cortex-a9/bionic/strlen.S \
|
||||
bionic/memmove.c \
|
||||
|
||||
@@ -7,7 +7,8 @@ libc_bionic_src_files_arm += \
|
||||
|
||||
# Use cortex-a15 versions of strcat/strcpy/strlen.
|
||||
libc_bionic_src_files_arm += \
|
||||
arch-arm/cortex-a15/bionic/stpcpy.S \
|
||||
arch-arm/cortex-a15/bionic/strcat.S \
|
||||
arch-arm/cortex-a15/bionic/strcmp.S \
|
||||
arch-arm/cortex-a15/bionic/strcpy.S \
|
||||
arch-arm/cortex-a15/bionic/strlen.S \
|
||||
arch-arm/cortex-a15/bionic/strcmp.S \
|
||||
|
||||
@@ -7,4 +7,5 @@ libc_bionic_src_files_arm += \
|
||||
bionic/memmove.c \
|
||||
bionic/__strcat_chk.cpp \
|
||||
bionic/__strcpy_chk.cpp \
|
||||
upstream-openbsd/lib/libc/string/stpcpy.c \
|
||||
upstream-openbsd/lib/libc/string/strcat.c \
|
||||
|
||||
@@ -7,6 +7,7 @@ libc_bionic_src_files_arm += \
|
||||
|
||||
# Use cortex-a15 versions of strcat/strcpy/strlen and standard memmove
|
||||
libc_bionic_src_files_arm += \
|
||||
arch-arm/cortex-a15/bionic/stpcpy.S \
|
||||
arch-arm/cortex-a15/bionic/strcat.S \
|
||||
arch-arm/cortex-a15/bionic/strcpy.S \
|
||||
arch-arm/cortex-a15/bionic/strlen.S \
|
||||
|
||||
Reference in New Issue
Block a user