| /* |
| * 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) |
| 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) |
| |
| /* memset() returns its first argument. */ |
| ENTRY(memset) |
| mov r3, r0 |
| vdup.8 q0, r1 |
| |
| /* make sure we have at least 32 bytes to write */ |
| subs r2, r2, #32 |
| blo 2f |
| vmov q1, q0 |
| |
| 1: /* The main loop writes 32 bytes at a time */ |
| subs r2, r2, #32 |
| vst1.8 {d0 - d3}, [r3]! |
| bhs 1b |
| |
| 2: /* less than 32 left */ |
| add r2, r2, #32 |
| tst r2, #0x10 |
| beq 3f |
| |
| // 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 1f |
| vst1.8 {d0}, [r3]! |
| 1: bge 2f |
| 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) |
