382bd666e2
We're not looking at __ARM_ARCH__, because we don't support ARMv6. Bug: http://b/18556103 Change-Id: I91fe096af697dc842a57e97515312e3530743678
85 lines
2.8 KiB
ArmAsm
85 lines
2.8 KiB
ArmAsm
/*
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* Copyright (C) 2008 The Android Open Source Project
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* All rights reserved.
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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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#include <private/bionic_asm.h>
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/*
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* This code assumes it is running on a processor that supports all arm v7
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* instructions, that supports neon instructions, and that supports
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* unaligned neon instruction accesses to memory.
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*/
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.fpu neon
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.syntax unified
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ENTRY(__memset_chk)
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cmp r2, r3
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bls memset
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// Preserve lr for backtrace.
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push {lr}
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.cfi_def_cfa_offset 4
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.cfi_rel_offset lr, 0
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bl __memset_chk_fail
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END(__memset_chk)
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/* memset() returns its first argument. */
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ENTRY(memset)
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mov r3, r0
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vdup.8 q0, r1
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/* make sure we have at least 32 bytes to write */
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subs r2, r2, #32
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blo 2f
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vmov q1, q0
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1: /* The main loop writes 32 bytes at a time */
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subs r2, r2, #32
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vst1.8 {d0 - d3}, [r3]!
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bhs 1b
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2: /* less than 32 left */
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add r2, r2, #32
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tst r2, #0x10
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beq 3f
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// writes 16 bytes, 128-bits aligned
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vst1.8 {d0, d1}, [r3]!
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3: /* write up to 15-bytes (count in r2) */
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movs ip, r2, lsl #29
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bcc 1f
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vst1.8 {d0}, [r3]!
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1: bge 2f
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vst1.32 {d0[0]}, [r3]!
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2: movs ip, r2, lsl #31
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strbmi r1, [r3], #1
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strbcs r1, [r3], #1
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strbcs r1, [r3], #1
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bx lr
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END(memset)
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