mes/lib/x86-mes-gcc/exit-42.S
Jan Nieuwenhuizen fbe0b2eef8
porting: Add x86 scaffold: exit and write in assembly.
* lib/x86-mes-gcc/exit-42.S: New file.
* lib/x86-mes-gcc/hello-mes.S: New file.
* lib/x86-mes/elf32-0exit-42.hex2: New file.
* lib/x86-mes/elf32-0hello-mes.hex2: New file.
* lib/x86-mes/elf32-body-hello-mes.hex2: New file.
* lib/x86-mes/elf32-body-exit-42.hex2: Rewrite.
* lib/x86-mes/elf32-header.hex2: Fix copyright header.
* lib/x86-mes/elf32-0header.hex2: Likewise.
* lib/x86-mes/elf-0footer.hex2: Remove.
* build-aux/build-scaffold.sh: Build them.
* .dir-locals.el (asm-mode): Allow TABs.
* .gitignore: Reserve .S assembly sources, i.e. manual written
assembly.  Update build system.
* module/mescc/mescc.scm: Update.
* build-aux/build-lib.sh: Update.
* scripts/ar.in: Update.
2019-06-13 14:19:59 +02:00

47 lines
1.3 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 $eax
RET
...
*/
/** Code: */
SYS_exit = 1 /* Linux syscall: exit. */
.globl _start /* Magic linker symbol: --entry-address. */
.text /* Program text. */
_start:
mov $SYS_exit,%eax /* System call function: exit, in %eax. */
mov $42,%ebx /* First parameter: exit status, in %ebx. */
int $0x80 /* Call system. */
hlt /* Should not be reached. */