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/* SPDX-License-Identifier: BSD-3-Clause */
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/* See the end of this file for copyright, licensing, 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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* Copyright (c) 2020 Felix Kopp <sandtler@sandtler.club>
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*
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* Redistribution and use in source and binary forms, with or without modification, are permitted
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* provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this list of
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* conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice, this list of
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* conditions and the following disclaimer in the documentation and/or other materials
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* provided with the distribution.
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* 3. Neither the name of the copyright holder nor the names of its contributors may be
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* used to endorse or promote products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
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* WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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