866e7b6906
There are a few instructions deprecated on armv8 that result in lots of warnings. Add an arch directive so that these warnings go away. This doesn't cause any problems because the instructions still execute properly. Bug: 38319728 Test: Built all of these assembler files and verified the warning are gone. Change-Id: If063defdd16f290c01975233c8d257d1b2005e76
168 lines
4.3 KiB
ArmAsm
168 lines
4.3 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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#include <private/bionic_asm.h>
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.syntax unified
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.thumb
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.thumb_func
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// To avoid warning about deprecated instructions, add an explicit
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// arch. The code generated is exactly the same.
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.arch armv7-a
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// Get the length of the source string first, then do a memcpy of the data
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// instead of a strcpy.
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ENTRY(__strcpy_chk)
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pld [r0, #0]
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push {r0, lr}
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.cfi_def_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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mov lr, r2
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mov r0, r1
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ands r3, r1, #7
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beq .L_mainloop
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// Align to a double word (64 bits).
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rsb r3, r3, #8
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lsls ip, r3, #31
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beq .L_align_to_32
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ldrb r2, [r0], #1
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cbz r2, .L_update_count_and_finish
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.L_align_to_32:
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bcc .L_align_to_64
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ands ip, r3, #2
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beq .L_align_to_64
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ldrb r2, [r0], #1
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cbz r2, .L_update_count_and_finish
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ldrb r2, [r0], #1
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cbz r2, .L_update_count_and_finish
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.L_align_to_64:
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tst r3, #4
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beq .L_mainloop
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ldr r3, [r0], #4
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sub ip, r3, #0x01010101
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bic ip, ip, r3
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ands ip, ip, #0x80808080
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bne .L_zero_in_second_register
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.p2align 2
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.L_mainloop:
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ldrd r2, r3, [r0], #8
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pld [r0, #64]
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sub ip, r2, #0x01010101
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bic ip, ip, r2
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ands ip, ip, #0x80808080
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bne .L_zero_in_first_register
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sub ip, r3, #0x01010101
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bic ip, ip, r3
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ands ip, ip, #0x80808080
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bne .L_zero_in_second_register
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b .L_mainloop
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.L_update_count_and_finish:
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sub r3, r0, r1
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sub r3, r3, #1
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b .L_check_size
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.L_zero_in_first_register:
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sub r3, r0, r1
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lsls r2, ip, #17
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bne .L_sub8_and_finish
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bcs .L_sub7_and_finish
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lsls ip, ip, #1
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bne .L_sub6_and_finish
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sub r3, r3, #5
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b .L_check_size
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.L_sub8_and_finish:
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sub r3, r3, #8
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b .L_check_size
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.L_sub7_and_finish:
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sub r3, r3, #7
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b .L_check_size
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.L_sub6_and_finish:
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sub r3, r3, #6
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b .L_check_size
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.L_zero_in_second_register:
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sub r3, r0, r1
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lsls r2, ip, #17
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bne .L_sub4_and_finish
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bcs .L_sub3_and_finish
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lsls ip, ip, #1
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bne .L_sub2_and_finish
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sub r3, r3, #1
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b .L_check_size
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.L_sub4_and_finish:
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sub r3, r3, #4
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b .L_check_size
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.L_sub3_and_finish:
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sub r3, r3, #3
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b .L_check_size
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.L_sub2_and_finish:
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sub r3, r3, #2
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.L_check_size:
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pld [r1, #0]
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pld [r1, #64]
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ldr r0, [sp]
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// Add 1 for copy length to get the string terminator.
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add r2, r3, #1
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cmp r2, lr
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itt hi
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movhi r0, r2
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bhi __strcpy_chk_fail
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// Fall through into the memcpy_base function.
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END(__strcpy_chk)
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#define MEMCPY_BASE __strcpy_chk_memcpy_base
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#define MEMCPY_BASE_ALIGNED __strcpy_chk_memcpy_base_aligned
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#include "memcpy_base.S"
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