85 lines
2.7 KiB
ArmAsm
85 lines
2.7 KiB
ArmAsm
/*
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* Copyright (C) 2013 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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/* Assumes neon instructions and a cache line size of 32 bytes. */
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#include <private/bionic_asm.h>
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#include <private/libc_events.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 has a 32 byte
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* cache line.
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*/
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.text
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.syntax unified
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.fpu neon
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.thumb
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.thumb_func
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ENTRY(__memcpy_chk)
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cmp r2, r3
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bhi .L_memcpy_chk_fail
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// Fall through to memcpy...
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END(__memcpy_chk)
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ENTRY(memcpy)
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pld [r1, #64]
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stmfd sp!, {r0, lr}
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.cfi_adjust_cfa_offset 8
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.cfi_rel_offset r0, 0
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.cfi_rel_offset lr, 4
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#include "memcpy_base.S"
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// Undo the cfi directives from above.
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.cfi_adjust_cfa_offset -8
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.cfi_restore r0
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.cfi_restore lr
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.L_memcpy_chk_fail:
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// Preserve lr for backtrace.
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push {lr}
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.cfi_adjust_cfa_offset 4
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.cfi_rel_offset lr, 0
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ldr r0, error_message
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ldr r1, error_code
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1:
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add r0, pc
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bl __fortify_chk_fail
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error_code:
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.word BIONIC_EVENT_MEMCPY_BUFFER_OVERFLOW
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error_message:
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.word error_string-(1b+4)
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END(memcpy)
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.data
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error_string:
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.string "memcpy: prevented write past end of buffer"
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