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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.
##
#define TOKEN_PASTE(x,y) x##y
#define PREFIXED_SYMBOL(prefix,name) TOKEN_PASTE(prefix,name)
.text
.globl PREFIXED_SYMBOL(SYMBOL_PREFIX,coroutine_transfer)
PREFIXED_SYMBOL(SYMBOL_PREFIX,coroutine_transfer):
# Make space on the stack for 6 registers:
subq $48, %rsp
# Save caller state:
movq %rbp, 40(%rsp)
movq %rbx, 32(%rsp)
movq %r12, 24(%rsp)
movq %r13, 16(%rsp)
movq %r14, 8(%rsp)
movq %r15, (%rsp)
# Save caller stack pointer:
movq %rsp, (%rdi)
# Restore callee stack pointer:
movq (%rsi), %rsp
# Restore callee state
movq 40(%rsp), %rbp
movq 32(%rsp), %rbx
movq 24(%rsp), %r12
movq 16(%rsp), %r13
movq 8(%rsp), %r14
movq (%rsp), %r15
# Adjust stack pointer back:
addq $48, %rsp
# Put the first argument into the return value:
movq %rdi, %rax
# We pop the return address and jump to it
ret
#if (defined(__linux__) || defined(__FreeBSD__)) && defined(__ELF__)
.section .note.GNU-stack,"",%progbits
#endif
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