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Diffstat (limited to 'coroutine/arm64/Context.S')
-rw-r--r-- | coroutine/arm64/Context.S | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/coroutine/arm64/Context.S b/coroutine/arm64/Context.S new file mode 100644 index 0000000000..f6e5f0a6bc --- /dev/null +++ b/coroutine/arm64/Context.S @@ -0,0 +1,59 @@ +## +## 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 |