fbe0b2eef8
* 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.
47 lines
1.3 KiB
ArmAsm
47 lines
1.3 KiB
ArmAsm
/*
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* GNU Mes --- Maxwell Equations of Software
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* Copyright © 2019 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
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*
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* This file is part of GNU Mes.
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*
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* GNU Mes is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or (at
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* your option) any later version.
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*
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* GNU Mes is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU Mes. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** Commentary: */
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/* Using gdb, esp. GUD in GNU Emacs is recommended
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M-x gdb-display-disassembly-buffer
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M-x gdb-display-io-buffer
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set disassemble-next-line on
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break _start
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run
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info registers
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si
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p/x $eax
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RET
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...
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*/
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/** Code: */
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SYS_exit = 1 /* Linux syscall: exit. */
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.globl _start /* Magic linker symbol: --entry-address. */
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.text /* Program text. */
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_start:
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mov $SYS_exit,%eax /* System call function: exit, in %eax. */
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mov $42,%ebx /* First parameter: exit status, in %ebx. */
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int $0x80 /* Call system. */
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hlt /* Should not be reached. */
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