603c87977f
kasan does not instrument the assembly function, so it is checked in advance before calling. If Kasan is not turned on, the speed and space will be almost unchanged under compiler optimization. Signed-off-by: anjiahao <anjiahao@xiaomi.com>
109 lines
2.9 KiB
ArmAsm
109 lines
2.9 KiB
ArmAsm
/****************************************************************************
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* libs/libc/machine/arm/armv7-m/gnu/arch_memset.S
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*
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* SPDX-License-Identifier: BSD-2-Clause
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* SPDX-FileCopyrightText: 2008 The Android Open Source Project
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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****************************************************************************/
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#include "libc.h"
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#ifdef LIBC_BUILD_MEMSET
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.thumb
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.syntax unified
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.global ARCH_LIBCFUN(memset)
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.type ARCH_LIBCFUN(memset), %function
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ARCH_LIBCFUN(memset):
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stmfd sp!, {r0, r4-r7, lr}
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rsb r3, r0, #0
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ands r3, r3, #3
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cmp r3, r2
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movhi r3, r2
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/* splat r1 */
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mov r1, r1, lsl #24
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orr r1, r1, r1, lsr #8
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orr r1, r1, r1, lsr #16
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movs r12, r3, lsl #31
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strbcs r1, [r0], #1
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strbcs r1, [r0], #1
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strbmi r1, [r0], #1
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subs r2, r2, r3
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popls {r0, r4-r7, pc}
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/* align the destination to a cache-line */
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mov r12, r1
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mov lr, r1
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mov r4, r1
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mov r5, r1
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mov r6, r1
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mov r7, r1
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rsb r3, r0, #0
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ands r3, r3, #0x1C
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beq 3f
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cmp r3, r2
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andhi r3, r2, #0x1C
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sub r2, r2, r3
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/* conditionally writes 0 to 7 words (length in r3) */
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movs r3, r3, lsl #28
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stmcs r0!, {r1, lr}
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stmcs r0!, {r1, lr}
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stmmi r0!, {r1, lr}
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movs r3, r3, lsl #2
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strcs r1, [r0], #4
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3:
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subs r2, r2, #32
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mov r3, r1
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bmi 2f
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1:
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subs r2, r2, #32
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stmia r0!, {r1,r3,r4,r5,r6,r7,r12,lr}
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bhs 1b
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2:
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add r2, r2, #32
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/* conditionally stores 0 to 31 bytes */
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movs r2, r2, lsl #28
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stmcs r0!, {r1,r3,r12,lr}
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stmmi r0!, {r1, lr}
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movs r2, r2, lsl #2
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strcs r1, [r0], #4
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strhmi r1, [r0], #2
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movs r2, r2, lsl #2
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strbcs r1, [r0]
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ldmfd sp!, {r0, r4-r7, pc}
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.size ARCH_LIBCFUN(memset), . - ARCH_LIBCFUN(memset)
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#endif
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