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85 lines
2.8 KiB
85 lines
2.8 KiB
/* |
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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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