diff options
Diffstat (limited to 'lib/libc/powerpc64/string/strncpy_arch_2_05.S')
| -rw-r--r-- | lib/libc/powerpc64/string/strncpy_arch_2_05.S | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/lib/libc/powerpc64/string/strncpy_arch_2_05.S b/lib/libc/powerpc64/string/strncpy_arch_2_05.S new file mode 100644 index 000000000000..98139c35af8c --- /dev/null +++ b/lib/libc/powerpc64/string/strncpy_arch_2_05.S @@ -0,0 +1,131 @@ +/*- + * 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("$FreeBSD$"); + +ENTRY(__strncpy_arch_2_05) + stdu %r1,-40(%r1) + mflr %r0 + std %r0,16(%r1) + std %r3,32(%r1) + + xor %r6,%r6,%r6 /* fixed 0 reg */ + +/* align loop */ + addi %r3,%r3,-1 +.Lalign_loop: + /* len? */ + cmpdi %r5,0 + beq .Lexit + /* aligned? */ + andi. %r0,%r4,7 + beq .Ldw_copy + /* copy */ + lbz %r7,0(%r4) + stbu %r7,1(%r3) + addi %r4,%r4,1 + addi %r5,%r5,-1 + /* zero? */ + cmpdi %r7,0 + beq .Lzero + b .Lalign_loop + +/* dword copy loop */ +.Ldw_copy: + /* prepare src and dst to use load/store and update */ + addi %r3,%r3,-7 + addi %r4,%r4,-8 +.Ldw_copy_loop: + cmpdi %r5,8 + blt .Lbyte_copy + + ldu %r0,8(%r4) + /* check for 0 */ + cmpb %r7,%r0,%r6 + cmpdi %r7,0 + bne .Lbyte_copy_and_zero + /* copy to dst */ + stdu %r0,8(%r3) + addi %r5,%r5,-8 + b .Ldw_copy_loop + +/* Copy remaining src bytes, zero-out buffer + * Note: r5 will be >= 8 + */ +.Lbyte_copy_and_zero: + addi %r3,%r3,7 + addi %r4,%r4,-1 +.Lbyte_copy_and_zero_loop: + lbzu %r7,1(%r4) + stbu %r7,1(%r3) + addi %r5,%r5,-1 + cmpdi %r7,0 + beq .Lzero + b .Lbyte_copy_and_zero_loop + +/* zero-out remaining dst bytes */ +.Lzero: + addi %r3,%r3,1 + li %r4,0 + /* r5 has len already */ + bl memset + nop + b .Lexit + +/* copy remaining (< 8) bytes */ +.Lbyte_copy: + cmpdi %r5,0 + beq .Lexit + addi %r3,%r3,7 + addi %r4,%r4,7 + mtctr %r5 +.Lbyte_copy_loop: + lbzu %r7,1(%r4) + stbu %r7,1(%r3) + cmpdi %r7,0 + /* 0 found: zero out remaining bytes */ + beq .Lbyte_copy_zero + bdnz .Lbyte_copy_loop + b .Lexit +.Lbyte_copy_zero_loop: + stbu %r6,1(%r3) +.Lbyte_copy_zero: + bdnz .Lbyte_copy_zero_loop + +.Lexit: + /* epilogue */ + ld %r3,32(%r1) + ld %r0,16(%r1) + mtlr %r0 + addi %r1,%r1,40 + blr + +END(__strncpy_arch_2_05) + + .section .note.GNU-stack,"",%progbits |