diff options
Diffstat (limited to 'libc/arch-arm/cortex-a15/bionic/memcpy_common.S')
-rw-r--r-- | libc/arch-arm/cortex-a15/bionic/memcpy_common.S | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/libc/arch-arm/cortex-a15/bionic/memcpy_common.S b/libc/arch-arm/cortex-a15/bionic/memcpy_common.S new file mode 100644 index 0000000..464fb46 --- /dev/null +++ b/libc/arch-arm/cortex-a15/bionic/memcpy_common.S @@ -0,0 +1,103 @@ +/* + * 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. + */ +/* + * Copyright (c) 2013 ARM Ltd + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. 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. + * 3. The name of the company may not be used to endorse or promote + * products derived from this software without specific prior written + * permission. + * + * THIS SOFTWARE IS PROVIDED BY ARM LTD ``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 ARM LTD 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> +#include <private/libc_events.h> + + .text + .syntax unified + .fpu neon + +ENTRY(__memcpy_chk) + cmp r2, r3 + bhi .L_memcpy_chk_fail + + // Fall through to memcpy... +END(__memcpy_chk) + +// Prototype: void *memcpy (void *dst, const void *src, size_t count). +ENTRY(memcpy) + pld [r1, #64] + push {r0, lr} + .cfi_def_cfa_offset 8 + .cfi_rel_offset r0, 0 + .cfi_rel_offset lr, 4 + +#include MEMCPY_BASE + + // Undo the cfi instructions from above. + .cfi_def_cfa_offset 0 + .cfi_restore r0 + .cfi_restore lr +.L_memcpy_chk_fail: + // Preserve lr for backtrace. + push {lr} + .cfi_adjust_cfa_offset 4 + .cfi_rel_offset lr, 0 + + ldr r0, error_message + ldr r1, error_code +1: + add r0, pc + bl __fortify_chk_fail +error_code: + .word BIONIC_EVENT_MEMCPY_BUFFER_OVERFLOW +error_message: + .word error_string-(1b+8) +END(memcpy) + + .data +error_string: + .string "memcpy: prevented write past end of buffer" |