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Add ARM gcc scaffold assembly. 

* lib/linux/arm-mes-gcc/exit-42.S: New file.
* lib/linux/arm-mes-gcc/hello-mes.S: New file.
This commit is contained in:
Danny Milosavljevic 2020-06-13 19:44:29 +02:00
parent 451274bc80
commit 449f3c7e00
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2 changed files with 104 additions and 0 deletions
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46
lib/linux/arm-mes-gcc/exit-42.S Normal file
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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 $r0
RET
...
*/
/** Code: */
SYS_exit = 1 /* Linux syscall: exit. */
.globl _start /* Magic linker symbol: --entry-address. */
.text /* Program text. */
_start:
mov r7,$SYS_exit /* System call function: exit, in r7. */
mov r0,$42 /* First parameter: exit status, in r0. */
swi 0 /* Call system. */
wfi /* Should not be reached. */

58
lib/linux/arm-mes-gcc/hello-mes.S Normal file
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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 $r0
RET
...
*/
/** Code: */
SYS_exit = 1 /* Linux syscalls. */
SYS_write = 4
stdout = 1 /* File discriptor */
.globl _start /* Magic linker symbol: --entry-address. */
.text /* Program text. */
_start:
mov r7, $SYS_write /* System call function: write, in r7. */
mov r0, $stdout /* 1st parameter: file descriptor, in r0. */
add r1, pc, $(hello - here - 4) /* 2nd parameter: address, in r1. */
here:
mov r2, $(bye-hello) /* 3rd parameter: byte count r2. */
swi 0 /* Call system. */
mov r7,$SYS_exit /* System call function: exit, in r7. */
mov r0,$0 /* 1st parameter: exit status, in r0. */
swi 0 /* Call system. */
wfi /* Should not be reached. */
hello: .ascii "Hello, GNU Mes!\n"
bye: