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##
## This file is part of the "Coroutine" project and released under the MIT License.
##
## Created by Samuel Williams on 4/11/2018.
## Copyright, 2018, by Samuel Williams. All rights reserved.
##
.text
.globl coroutine_transfer
coroutine_transfer:
# Save the thread information block:
pushq %gs:8
pushq %gs:16
# Save caller registers:
pushq %rbp
pushq %rbx
pushq %rdi
pushq %rsi
pushq %r12
pushq %r13
pushq %r14
pushq %r15
movaps -24(%rsp), %xmm6
movaps -40(%rsp), %xmm7
movaps -56(%rsp), %xmm8
movaps -72(%rsp), %xmm9
movaps -88(%rsp), %xmm10
movaps -104(%rsp), %xmm11
movaps -120(%rsp), %xmm12
movaps -136(%rsp), %xmm13
movaps -152(%rsp), %xmm14
movaps -168(%rsp), %xmm15
# Save caller stack pointer:
mov %rsp, (%rcx)
# Restore callee stack pointer:
mov (%rdx), %rsp
movaps %xmm15, -168(%rsp)
movaps %xmm14, -152(%rsp)
movaps %xmm13, -136(%rsp)
movaps %xmm12, -120(%rsp)
movaps %xmm11, -104(%rsp)
movaps %xmm10, -88(%rsp)
movaps %xmm9, -72(%rsp)
movaps %xmm8, -56(%rsp)
movaps %xmm7, -40(%rsp)
movaps %xmm6, -24(%rsp)
# Restore callee stack:
popq %r15
popq %r14
popq %r13
popq %r12
popq %rsi
popq %rdi
popq %rbx
popq %rbp
# Restore the thread information block:
popq %gs:16
popq %gs:8
# Put the first argument into the return value:
mov %rcx, %rax
# We pop the return address and jump to it:
ret
.globl coroutine_trampoline
coroutine_trampoline:
# Do not remove this. This forces 16-byte alignment when entering the coroutine.
ret
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