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25d0310ed8
This is built into a test so needs the BTI elf note for the rest of the test to be built with BTI support enabled. As the assembly uses the ENTRY macro it already supports BTI, so mark it as such. Sponsored by: Arm Ltd Differential Revision: https://reviews.freebsd.org/D42595
83 lines
2.4 KiB
ArmAsm
83 lines
2.4 KiB
ArmAsm
/*-
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* Copyright (c) 2017 Michael Tuexen
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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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* 1. 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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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT 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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*/
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#include <machine/asm.h>
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#include <sys/elf_common.h>
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.arch_extension crc
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/*
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* uint32_t
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* armv8_crc32c(uint32_t crc, const unsigned char *buf, unsigned int len)
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*/
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ENTRY(armv8_crc32c)
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cbz w2, end
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tbz x1, #0x0, half_word_aligned
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sub w2, w2, 0x1
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ldr w10, [x1], #0x1
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crc32cb w0, w0, w10
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half_word_aligned:
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cmp w2, #0x2
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b.lo last_byte
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tbz x1, #0x1, word_aligned
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sub w2, w2, 0x2
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ldr w10, [x1], #0x2
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crc32ch w0, w0, w10
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word_aligned:
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cmp w2, #0x4
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b.lo last_half_word
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tbz x1, #0x2, double_word_aligned
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sub w2, w2, 0x4
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ldr w10, [x1], #0x4
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crc32cw w0, w0, w10
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double_word_aligned:
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lsr w9, w2, #0x3
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cbz w9, last_word
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loop:
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ldr x10, [x1], #0x8
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crc32cx w0, w0, x10
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subs w9, w9, #1
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b.ne loop
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last_word:
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tbz w2, #0x2, last_half_word
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ldr w10, [x1], #0x4
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crc32cw w0, w0, w10
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last_half_word:
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tbz w2, #0x1, last_byte
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ldr w10, [x1], #0x2
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crc32ch w0, w0, w10
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last_byte:
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tbz w2, #0x0, end
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ldr w10, [x1], #0x1
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crc32cb w0, w0, w10
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end:
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ret
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END(armv8_crc32c)
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GNU_PROPERTY_AARCH64_FEATURE_1_NOTE(GNU_PROPERTY_AARCH64_FEATURE_1_VAL)
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