memcpy.S revision bd7fe1d3c4c8877ac53839169851621249289bd7
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/* Assumes neon instructions and a cache line size of 32 bytes. */ 30 31#include <machine/asm.h> 32#include "libc_events.h" 33 34/* 35 * This code assumes it is running on a processor that supports all arm v7 36 * instructions, that supports neon instructions, and that has a 32 byte 37 * cache line. 38 */ 39 40 .text 41 .syntax unified 42 .fpu neon 43 .thumb 44 .thumb_func 45 46ENTRY(__memcpy_chk) 47 .cfi_startproc 48 cmp r2, r3 49 bgt __memcpy_chk_fail 50 51 // Fall through to memcpy... 52 .cfi_endproc 53END(__memcpy_chk) 54 55ENTRY(memcpy) 56 .cfi_startproc 57 pld [r1, #64] 58 .save {r0, lr} 59 stmfd sp!, {r0, lr} 60 .cfi_def_cfa_offset 8 61 .cfi_rel_offset r0, 0 62 .cfi_rel_offset lr, 4 63 64 #include "memcpy_base.S" 65 .cfi_endproc 66END(memcpy) 67 68 .fnstart 69 .cfi_startproc 70__memcpy_chk_fail: 71 // Preserve lr for backtrace. 72 .save {lr} 73 push {lr} 74 .cfi_def_cfa_offset 4 75 .cfi_rel_offset lr, 0 76 77 ldr r0, error_message 78 ldr r1, error_code 791: 80 add r0, pc 81 bl __fortify_chk_fail 82error_code: 83 .word BIONIC_EVENT_MEMCPY_BUFFER_OVERFLOW 84error_message: 85 .word error_string-(1b+4) 86 .cfi_endproc 87 .fnend 88 89 .data 90error_string: 91 .string "memcpy buffer overflow" 92