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70 lines
1.3 KiB
ArmAsm

/* See the end of this file for copyright, license, and warranty information. */
.syntax unified
.thumb
.text
.extern arch_enter
.thumb_func
.global irq_svc
.type irq_svc, %function
/* void irq_svc(void); */
irq_svc:
/*
* Syscalls on Cortex-M use the following parameter calling convention:
*
* number: r7
* rval: r0
* arg1: r0
* arg2: r1
* arg3: r2
* arg4: r3
* arg5: r4
* arg6: r5
*/
/*
* like in irq_pend_sv, we save everything on the stack to make early
* process switching possible in case the syscall is blocking.
*/
push {r4-r7} /* r4-r7 */
mov r3, r8
mov r4, r9
mov r5, r10
mov r6, r11
mov r7, lr
push {r3-r7} /* r8-r11, lr */
mov r0, sp
bl arch_enter /* arch_enter(sp); */
pop {r3-r7} /* r8-r11, lr */
mov lr, r7
mov r11, r6
mov r10, r5
mov r9, r4
mov r8, r3
pop {r4-r7} /* r4-r7 */
bx lr
.size irq_svc, .-irq_svc
/*
* This file is part of Ardix.
* Copyright (c) 2020, 2021 Felix Kopp <owo@fef.moe>.
*
* Ardix is non-violent software: you may only use, redistribute,
* and/or modify it under the terms of the CNPLv6+ as found in
* the LICENSE file in the source code root directory or at
* <https://git.pixie.town/thufie/CNPL>.
*
* Ardix comes with ABSOLUTELY NO WARRANTY, to the extent
* permitted by applicable law. See the CNPLv6+ for details.
*/