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@ Copyright 2022-2023 Gabriel Jensen.
@ This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
@ If a copy of the MPL was not distributed with this file, You can obtain one at <https://mozilla.org/MPL/2.0>.
.syntax unified
.arm
.globl zap_syscall
zap_syscall:
@ System calls on ARM EABI use the following registers:
@ r0 : System call identifier
@ r1 : First parameter
@ r2 : Second parameter
@ r3 : Third parameter
@ r4 : Fourth parameter
@ r5 : Fifth parameter
@ r6 : Sixth parameter
@ r0 : Return value
push {r4-r5,r7,lr} @ Remember that the parameters are now further up the stack.
mov r7,r0 @ Move the identifier.
mov r0,r1 @ Place parameters.
mov r1,r2
mov r2,r3
ldr r3,[sp,0x10] @ Get the remaining parameters from the stack.
ldr r4,[sp,0x14]
ldr r5,[sp,0x18]
svc 0x0 @ Divinity
pop {r4-r5,r7} @ Restore the registers.
pop {r0}
bx r0
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