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/* SPDX-License-Identifier: GPL-3.0-or-later */
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/* See the end of this file for copyright, license, and warranty information. */
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.syntax unified
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.thumb
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/* this is only invoked from user space, obviously */
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.section .text.shared
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.thumb_func
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.global syscall
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.type syscall, %function
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/* int syscall(int number, int arg1, int arg2, int arg3, int arg4, int arg5, int arg6); */
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syscall:
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push {r4-r5,r7}
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/*
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* I HAVE NO IDEA WHY THE F U C K GCC THINKS I CAN'T MOV TWO LOW REGS
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* IN ONE INSTRUCTION WHEN THAT IS L I T E R A L L Y IN THE ASM OUTPUT
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* OF GCC WHEN COMPILING SOME C CODE. BUT AT THIS POINT, I WON'T EVEN
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* BOTHER WITH WHATEVER SHITTY COMPILE OPTION OR PREPROCESSOR DIRECTIVE
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* I HAVE TO TURN ON IN ORDER FOR THIS PIECE OF SHIT THAT DARES CALLING
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* ITSELF A COMPILER TO EAT MY SHIT CODE AND SHIT OUT THE SHITTY BINARY
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* I WANT. FUCK YOU, SYSCALLS WILL JUST TAKE 8 INSTRUCTIONS MORE.
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*/
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mov r4, r12
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push {r4}
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mov r12, r0 /* syscall number */
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mov r7, r12
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mov r12, r1 /* arg1 */
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mov r0, r12
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mov r12, r2 /* arg2 */
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mov r1, r12
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mov r12, r3 /* arg3 */
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mov r2, r12
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pop {r4}
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mov r12, r4
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/* stack params begin at 12 bytes offset because we already pushed three registers */
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ldr r3, [sp, #12] /* arg4 */
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ldr r4, [sp, #16] /* arg5 */
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ldr r5, [sp, #20] /* arg6 */
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svc #0
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pop {r4-r5,r7}
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/* r0 (return value) is set by the kernel */
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bx lr
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.size syscall, .-syscall
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/*
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* This file is part of Ardix.
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* Copyright (c) 2020, 2021 Felix Kopp <owo@fef.moe>.
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*
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* Ardix 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
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* (at your option) any later version.
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*
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* Ardix 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.
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* See the 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 this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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