2018-11-20 04:59:10 -05:00
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##
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2018-11-20 05:16:29 -05:00
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## This file is part of the "Coroutine" project and released under the MIT License.
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2018-11-20 04:59:10 -05:00
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##
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## Created by Samuel Williams on 10/5/2018.
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## Copyright, 2018, by Samuel Williams. All rights reserved.
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##
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.text
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.align 2
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2018-11-20 05:17:00 -05:00
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2018-11-20 04:59:10 -05:00
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.global coroutine_transfer
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coroutine_transfer:
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2018-11-20 05:17:00 -05:00
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2018-11-20 04:59:10 -05:00
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# Make space on the stack for caller registers
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sub sp, sp, 0xb0
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# Save caller registers
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stp d8, d9, [sp, 0x00]
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stp d10, d11, [sp, 0x10]
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stp d12, d13, [sp, 0x20]
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stp d14, d15, [sp, 0x30]
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stp x19, x20, [sp, 0x40]
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stp x21, x22, [sp, 0x50]
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stp x23, x24, [sp, 0x60]
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stp x25, x26, [sp, 0x70]
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stp x27, x28, [sp, 0x80]
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stp x29, x30, [sp, 0x90]
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# Save return address
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str x30, [sp, 0xa0]
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# Save stack pointer to x0 (first argument)
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mov x2, sp
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str x2, [x0, 0]
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# Load stack pointer from x1 (second argument)
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ldr x3, [x1, 0]
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mov sp, x3
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# Restore caller registers
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ldp d8, d9, [sp, 0x00]
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ldp d10, d11, [sp, 0x10]
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ldp d12, d13, [sp, 0x20]
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ldp d14, d15, [sp, 0x30]
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ldp x19, x20, [sp, 0x40]
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ldp x21, x22, [sp, 0x50]
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ldp x23, x24, [sp, 0x60]
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ldp x25, x26, [sp, 0x70]
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ldp x27, x28, [sp, 0x80]
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ldp x29, x30, [sp, 0x90]
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# Load return address into x4
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ldr x4, [sp, 0xa0]
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# Pop stack frame
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add sp, sp, 0xb0
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# Jump to return address (in x4)
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ret x4
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