memcpy.S revision 16e185c9081530859c17270fbaf5798f0ea871f8
1/* 2 * Copyright (C) 2008 The Android Open Source Project 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in 12 * the documentation and/or other materials provided with the 13 * distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29#include <machine/asm.h> 30#include "libc_events.h" 31 32/* 33 * This code assumes it is running on a processor that supports all arm v7 34 * instructions, that supports neon instructions, and that has a 32 byte 35 * cache line. 36 */ 37 38 .syntax unified 39 .fpu neon 40 .thumb 41 .thumb_func 42 43ENTRY(__memcpy_chk) 44 .cfi_startproc 45 cmp r2, r3 46 bhi __memcpy_chk_fail 47 48 // Fall through to memcpy... 49 .cfi_endproc 50END(__memcpy_chk) 51 52ENTRY(memcpy) 53 .cfi_startproc 54 55 pld [r1, #0] 56 stmfd sp!, {r0, lr} 57 .save {r0, lr} 58 .cfi_def_cfa_offset 8 59 .cfi_rel_offset r0, 0 60 .cfi_rel_offset lr, 4 61 pld [r1, #64] 62 63 .cfi_endproc 64END(memcpy) 65 66#define MEMCPY_BASE __memcpy_base 67#define MEMCPY_BASE_ALIGNED __memcpy_base_aligned 68#include "memcpy_base.S" 69 70ENTRY(__memcpy_chk_fail) 71 .cfi_startproc 72 // Preserve lr for backtrace. 73 push {lr} 74 .save {lr} 75 .cfi_def_cfa_offset 4 76 .cfi_rel_offset lr, 0 77 78 ldr r0, error_message 79 ldr r1, error_code 801: 81 add r0, pc 82 bl __fortify_chk_fail 83error_code: 84 .word BIONIC_EVENT_MEMCPY_BUFFER_OVERFLOW 85error_message: 86 .word error_string-(1b+4) 87 .cfi_endproc 88END(__memcpy_chk_fail) 89 90 .data 91error_string: 92 .string "memcpy buffer overflow" 93