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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. All rights reserved.
*/
#pragma once
#include <assert.h>
#include <string.h>
#if __cplusplus
extern "C" {
#endif
#define COROUTINE __declspec(noreturn) void
const size_t COROUTINE_REGISTERS = 8;
const size_t COROUTINE_XMM_REGISTERS = 1+10*2;
struct coroutine_context
{
void **stack_pointer;
};
typedef void(* coroutine_start)(coroutine_context *from, coroutine_context *self);
void coroutine_trampoline();
static inline void coroutine_initialize(
coroutine_context *context,
coroutine_start start,
void *stack_pointer,
size_t stack_size
) {
/* Force 16-byte alignment */
context->stack_pointer = (void**)((uintptr_t)stack_pointer & ~0xF);
if (!start) {
assert(!context->stack_pointer);
/* We are main coroutine for this thread */
return;
}
/* Win64 ABI requires space for arguments */
context->stack_pointer -= 4;
/* Return address */
*--context->stack_pointer = 0;
*--context->stack_pointer = (void*)start;
*--context->stack_pointer = (void*)coroutine_trampoline;
/* Windows Thread Information Block */
/* *--context->stack_pointer = 0; */ /* gs:[0x00] is not used */
*--context->stack_pointer = (void*)stack_pointer; /* gs:[0x08] */
*--context->stack_pointer = (void*)((char *)stack_pointer - stack_size); /* gs:[0x10] */
context->stack_pointer -= COROUTINE_REGISTERS;
memset(context->stack_pointer, 0, sizeof(void*) * COROUTINE_REGISTERS);
memset(context->stack_pointer - COROUTINE_XMM_REGISTERS, 0, sizeof(void*) * COROUTINE_XMM_REGISTERS);
}
coroutine_context * coroutine_transfer(coroutine_context * current, coroutine_context * target);
static inline void coroutine_destroy(coroutine_context * context)
{
}
#if __cplusplus
}
#endif
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