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Add stpcpy assembler version.

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For generic, continue to use the C version of the code.

Bug: 13746695
Change-Id: I77426a70b06131f2373bb51265bea1240bb3f101
This commit is contained in:
Christopher Ferris 2014-09-30 11:53:13 -07:00
parent 0481471b1b
commit 7d849ac378
12 changed files with 1124 additions and 869 deletions
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1
libc/arch-arm/arm.mk
View file

@ -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
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@ -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"

432
libc/arch-arm/cortex-a15/bionic/strcpy.S
View file

@ -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
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@ -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

5
libc/arch-arm/cortex-a15/cortex-a15.mk
View file

@ -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
View 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"

437
libc/arch-arm/cortex-a9/bionic/strcpy.S
View file

@ -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
View 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

5
libc/arch-arm/cortex-a9/cortex-a9.mk
View file

@ -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 \

3
libc/arch-arm/denver/denver.mk
View file

@ -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 \

1
libc/arch-arm/generic/generic.mk
View file

@ -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 \

1
libc/arch-arm/krait/krait.mk
View file

@ -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 \