mes/lib/linux/x86_64-mes-gcc/exit-42.S

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/*
* GNU Mes --- Maxwell Equations of Software
* Copyright © 2019 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
*
* This file is part of GNU Mes.
*
* GNU Mes is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or (at
* your option) any later version.
*
* GNU Mes is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Mes. If not, see <http://www.gnu.org/licenses/>.
*/
/** Commentary: */
/* Using gdb, esp. GUD in GNU Emacs is recommended
M-x gdb-display-disassembly-buffer
M-x gdb-display-io-buffer
set disassemble-next-line on
break _start
run
info registers
si
p/x $rax
RET
...
*/
/** Code: */
SYS_exit = 0x3c /* Linux syscall: exit. */
.globl _start /* Magic linker symbol: --entry-address. */
.text /* Program text. */
_start:
movabs $SYS_exit,%rax /* System call function: exit, in %rax. */
movabs $42,%rdi /* First parameter: exit status, in %rdi. */
syscall /* Call system. */
hlt /* Should not be reached. */