diff options
Diffstat (limited to 'src/u_hexdec.S')
| -rw-r--r-- | src/u_hexdec.S | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/src/u_hexdec.S b/src/u_hexdec.S new file mode 100644 index 0000000..a362ba6 --- /dev/null +++ b/src/u_hexdec.S @@ -0,0 +1,72 @@ +/* + * ======================== + * ===== =============== + * ====== ================ + * ====== ================ + * ====== ==== ==== == + * ====== === == = = + * ====== === = == = + * = === === = == ==== + * = === === = == = = + * == ===== ==== == + * ======================== + * + * SPDX-License-Identifier: BSD-3-Clause + * + * Copyright (c) 2020 Joe + * 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 organization nor the + * names of its contributors may be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY JOE ''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 JOE 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. + * + * bsdsetsid: src/u_hexdec.S + * 2020-11-21 14:00 + * Joe + * + * General error handling happen here. + */ + +.text +.globl u_hexdec + +u_hexdec: + xor %r10, %r10 + xor %r9, %r9 + xor %r8, %r8 + mov $0xa, %rbx + clc +.u.repeat: + xor %rdx, %rdx + idiv %rbx + or $0x0, %dl + mov $0x8, %rcx +.u.shift: + rcrb $0x1, %dl + rcr $0x1, %r10 + rcr $0x1, %r9 + rcr $0x1, %r8 + dec %rcx + and %rcx, %rcx + jnz .u.shift + and %rax, %rax + jnz .u.repeat + ret |