Changeset View
Changeset View
Standalone View
Standalone View
head/lib/libc/powerpc64/string/memcpy.S
| Property | Old Value | New Value |
|---|---|---|
| svn:eol-style | null | native \ No newline at end of property |
| svn:keywords | null | FreeBSD=%H \ No newline at end of property |
| svn:mime-type | null | text/plain \ No newline at end of property |
| /*- | |||||
| * Copyright (c) 2018 Instituto de Pesquisas Eldorado | |||||
| * 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. Neither the name of the author nor the names of its contributors may | |||||
| * be used to endorse or promote products derived from this software | |||||
| * | |||||
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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. | |||||
| * | |||||
| */ | |||||
| #include <machine/asm.h> | |||||
| __FBSDID("$FreeBSD$"); | |||||
| #ifndef FN_NAME | |||||
| #define FN_NAME __memcpy | |||||
| WEAK_REFERENCE(__memcpy, memcpy); | |||||
| #define BLOCK_BITS 4 | |||||
| #endif | |||||
| #define BLOCK_BYTES (1 << BLOCK_BITS) | |||||
| #define BLOCK_MASK (BLOCK_BYTES - 1) | |||||
| /* | |||||
| * r3: dst | |||||
| * r4: src | |||||
| * r5: len | |||||
| */ | |||||
| ENTRY(FN_NAME) | |||||
| cmpdi %r5, 0 /* len == 0? nothing to do */ | |||||
| beqlr- | |||||
| mr %r8, %r3 /* save dst */ | |||||
| /* align src */ | |||||
| .Lalignment_loop: | |||||
| lbz %r6, 0(%r4) | |||||
| stb %r6, 0(%r3) | |||||
| addi %r3, %r3, 1 | |||||
| addi %r4, %r4, 1 | |||||
| addi %r5, %r5, -1 | |||||
| cmpdi %r5, 0 | |||||
| beq .Lexit | |||||
| andi. %r0, %r4, BLOCK_MASK | |||||
| bne .Lalignment_loop | |||||
| /* r7 = remaining, non-block, bytes */ | |||||
| andi. %r7, %r5, BLOCK_MASK | |||||
| /* Check if there are blocks of BLOCK_BYTES to be copied */ | |||||
| xor. %r5, %r5, %r7 | |||||
| beq .Lcopy_remaining_fix_index_byte | |||||
| #ifdef FN_COPY_LOOP | |||||
| FN_COPY_LOOP | |||||
| #else | |||||
| /* Setup to copy word with ldu and stdu */ | |||||
| ld %r6, 0(%r4) | |||||
| ld %r9, 8(%r4) | |||||
| std %r6, 0(%r3) | |||||
| std %r9, 8(%r3) | |||||
| addi %r5, %r5, -BLOCK_BYTES | |||||
| cmpd %r5, 0 | |||||
| beq .Lcopy_remaining_fix_index_word | |||||
| srdi %r5, %r5, BLOCK_BITS | |||||
| mtctr %r5 | |||||
| .Lcopy_word: | |||||
| ldu %r6, 16(%r4) | |||||
| ld %r9, 8(%r4) | |||||
| stdu %r6, 16(%r3) | |||||
| std %r9, 8(%r3) | |||||
| bdnz .Lcopy_word | |||||
| .Lcopy_remaining_fix_index_word: | |||||
| /* Check if there are remaining bytes */ | |||||
| cmpd %r7, 0 | |||||
| beq .Lexit | |||||
| addi %r3, %r3, BLOCK_MASK | |||||
| addi %r4, %r4, BLOCK_MASK | |||||
| b .Lcopy_remaining | |||||
| #endif | |||||
| .Lcopy_remaining_fix_index_byte: | |||||
| addi %r4, %r4, -1 | |||||
| addi %r3, %r3, -1 | |||||
| /* Copy remaining bytes */ | |||||
| .Lcopy_remaining: | |||||
| mtctr %r7 | |||||
| .Lcopy_remaining_loop: | |||||
| lbzu %r6, 1(%r4) | |||||
| stbu %r6, 1(%r3) | |||||
| bdnz .Lcopy_remaining_loop | |||||
| .Lexit: | |||||
| /* Restore dst */ | |||||
| mr %r3, %r8 | |||||
| blr | |||||
| END(FN_NAME) | |||||
| .section .note.GNU-stack,"",%progbits | |||||