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##
## amd64.c
## File 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
.globl coroutine_transfer
coroutine_transfer:
# For older linkers
.globl _coroutine_transfer
_coroutine_transfer:
# Save caller state
pushq %rbp
pushq %rbx
pushq %r12
pushq %r13
pushq %r14
pushq %r15
# Save caller stack pointer
movq %rsp, (%rdi)
# Restore callee stack pointer
movq (%rsi), %rsp
# Restore callee stack
popq %r15
popq %r14
popq %r13
popq %r12
popq %rbx
popq %rbp
# Put the first argument into the return value
movq %rdi, %rax
# We pop the return address and jump to it
ret
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