46 lines
1.6 KiB
ArmAsm
46 lines
1.6 KiB
ArmAsm
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/*
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* GNU Mes --- Maxwell Equations of Software
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* Copyright © 2021 W. J. van der Laan <laanwj@protonmail.com>
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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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/** Code: */
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SYS_exit = 93 /* Linux syscalls. */
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SYS_write = 64
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stdout = 1 /* File descriptor */
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.globl _start /* Magic linker symbol: --entry-address. */
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.text /* Program text. */
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hello: .ascii "Hello, GNU Mes!\n"
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bye:
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.equ string_size, (bye - hello)
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_start:
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li a7, SYS_write /* System call function: write, in a7. */
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li a0, stdout /* 1st parameter: file descriptor, in a0. */
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.equ string_offset, (hello - .)
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auipc a1, 0 /* Load pc for pc-relative address */
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addi a1, a1, string_offset /* 2nd parameter: address, in a1. */
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li a2, string_size /* 3rd parameter: byte count a2. */
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ecall /* Call system. */
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li a7, SYS_exit /* System call function: exit, in a7. */
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li a0, 0 /* 1st parameter: exit status, in a0. */
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ecall /* Call system. */
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wfi /* Should not be reached. */
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