/*
* Copyright ( C ) 2008 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 .
*/
#include <private/bionic_asm.h>
/*
* This code assumes it is running on a processor that supports all arm v7
* instructions , that supports neon instructions , and that supports
* unaligned neon instruction accesses to memory .
*/
.fpu neon
.syntax unified
ENTRY(__memset_chk_krait)
cmp r2, r3
bls memset
// Preserve lr for backtrace.
push {lr}
.cfi_def_cfa_offset 4
.cfi_rel_offset lr, 0
bl __memset_chk_fail
END(__memset_chk_krait)
/* memset() returns its first argument. */
ENTRY(memset_krait)
mov r3, r0
vdup.8 q0, r1
/* make sure we have at least 32 bytes to write */
subs r2, r2, #32
blo 2 f
vmov q1, q0
1 : /* The main loop writes 32 bytes at a time */
subs r2, r2, #32
vst1.8 {d0 - d3}, [r3]!
bhs 1 b
2 : /* less than 32 left */
add r2, r2, #32
tst r2, #0 x10
beq 3 f
// writes 16 bytes, 128 -bits aligned
vst1.8 {d0, d1}, [r3]!
3 : /* write up to 15-bytes (count in r2) */
movs ip, r2, lsl #29
bcc 1 f
vst1.8 {d0}, [r3]!
1 : bge 2 f
vst1.32 {d0[0 ]}, [r3]!
2 : movs ip, r2, lsl #31
strbmi r1, [r3], #1
strbcs r1, [r3], #1
strbcs r1, [r3], #1
bx lr
END(memset_krait)
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(vorverarbeitet am 2026-06-28)
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