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##
## This file is part of the "Coroutine" project and released under the MIT License.
##
## Created by Samuel Williams on 10/5/2018.
## Copyright, 2018, by Samuel Williams. All rights reserved.
##
.text
.align 2
.global coroutine_transfer
coroutine_transfer:
# Make space on the stack for caller registers
sub sp, sp, 0xb0
# Save caller registers
stp d8, d9, [sp, 0x00]
stp d10, d11, [sp, 0x10]
stp d12, d13, [sp, 0x20]
stp d14, d15, [sp, 0x30]
stp x19, x20, [sp, 0x40]
stp x21, x22, [sp, 0x50]
stp x23, x24, [sp, 0x60]
stp x25, x26, [sp, 0x70]
stp x27, x28, [sp, 0x80]
stp x29, x30, [sp, 0x90]
# Save return address
str x30, [sp, 0xa0]
# Save stack pointer to x0 (first argument)
mov x2, sp
str x2, [x0, 0]
# Load stack pointer from x1 (second argument)
ldr x3, [x1, 0]
mov sp, x3
# Restore caller registers
ldp d8, d9, [sp, 0x00]
ldp d10, d11, [sp, 0x10]
ldp d12, d13, [sp, 0x20]
ldp d14, d15, [sp, 0x30]
ldp x19, x20, [sp, 0x40]
ldp x21, x22, [sp, 0x50]
ldp x23, x24, [sp, 0x60]
ldp x25, x26, [sp, 0x70]
ldp x27, x28, [sp, 0x80]
ldp x29, x30, [sp, 0x90]
# Load return address into x4
ldr x4, [sp, 0xa0]
# Pop stack frame
add sp, sp, 0xb0
# Jump to return address (in x4)
ret x4
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