1 /* 2 * Copyright (C) 2013 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 46 ENTRY(__memcpy_chk) 47 .cfi_startproc 48 cmp r2, r3 49 bhi __memcpy_chk_fail 50 51 // Fall through to memcpy... 52 .cfi_endproc 53 END(__memcpy_chk) 54 55 ENTRY(memcpy) 56 .cfi_startproc 57 pld [r1, #64] 58 stmfd sp!, {r0, lr} 59 .save {r0, lr} 60 .cfi_def_cfa_offset 8 61 .cfi_rel_offset r0, 0 62 .cfi_rel_offset lr, 4 63 .cfi_endproc 64 END(memcpy) 65 66 #define MEMCPY_BASE __memcpy_base 67 #define MEMCPY_BASE_ALIGNED __memcpy_base_aligned 68 #include "memcpy_base.S" 69 70 ENTRY(__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 80 1: 81 add r0, pc 82 bl __fortify_chk_fail 83 error_code: 84 .word BIONIC_EVENT_MEMCPY_BUFFER_OVERFLOW 85 error_message: 86 .word error_string-(1b+4) 87 .cfi_endproc 88 END(__memcpy_chk_fail) 89 90 .data 91 error_string: 92 .string "memcpy buffer overflow" 93
