9f60920538
* lib/x86_64-mes-gcc/exit-42.S: New file. * lib/x86_64-mes-gcc/hello-mes.S: New file. * lib/x86_64-mes/elf64-0exit-42.hex2: New file. * lib/x86_64-mes/elf64-0hello-mes.hex2: New file. * lib/x86_64-mes/elf64-body-exit-42.hex2: Rewrite.. * lib/x86_64-mes/elf64-body-hello-mes.hex2: * lib/x86_64-mes/elf64-0header.hex2: Fix copyright header. * lib/x86_64-mes/elf64-header.hex2: Likewise. * lib/x86_64-mes/elf-0footer.hex2: Remove.
59 lines
1.7 KiB
ArmAsm
59 lines
1.7 KiB
ArmAsm
/*
|
|
* 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 syscalls. */
|
|
SYS_write = 0x01
|
|
stdout = 1 /* File discriptor */
|
|
.globl _start /* Magic linker symbol: --entry-address. */
|
|
|
|
.text /* Program text. */
|
|
_start:
|
|
movabs $SYS_write,%rax /* System call function: write, in %rax. */
|
|
movabs $stdout,%rdi /* 1st parameter: file descriptor, in %rdi. */
|
|
movabs $hello,%rsi /* 2nd parameter: address, in %rsi. */
|
|
movabs $(bye-hello),%rdx /* 3rd parameter: byte count %rdx. */
|
|
syscall /* Call system. */
|
|
|
|
movabs $SYS_exit,%rax /* System call function: exit, in %rax. */
|
|
movabs $0,%rdi /* 1st parameter: exit status, in %rdi. */
|
|
syscall /* Call system. */
|
|
hlt /* Should not be reached. */
|
|
|
|
.data
|
|
hello: .ascii "Hello, GNU Mes!\n"
|
|
bye: .byte 0
|