blob: f626a47225c73e03d4f162a95aec6c9e6be16f74 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
|
#ifndef COROUTINE_AMD64_CONTEXT_H
#define COROUTINE_AMD64_CONTEXT_H 1
/*
* 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.
*/
#pragma once
#include <assert.h>
#include <stddef.h>
#include <stdint.h>
#include <string.h>
#define COROUTINE __attribute__((noreturn)) void
enum {COROUTINE_REGISTERS = 6};
struct coroutine_context
{
void **stack_pointer;
void *argument;
};
typedef COROUTINE(* coroutine_start)(struct coroutine_context *from, struct coroutine_context *self);
static inline void coroutine_initialize_main(struct coroutine_context * context) {
context->stack_pointer = NULL;
}
static inline void coroutine_initialize(
struct coroutine_context *context,
coroutine_start start,
void *stack,
size_t size
) {
assert(start && stack && size >= 1024);
// Stack grows down. Force 16-byte alignment.
char * top = (char*)stack + size;
context->stack_pointer = (void**)((uintptr_t)top & ~0xF);
*--context->stack_pointer = NULL;
*--context->stack_pointer = (void*)start;
context->stack_pointer -= COROUTINE_REGISTERS;
memset(context->stack_pointer, 0, sizeof(void*) * COROUTINE_REGISTERS);
}
struct coroutine_context * coroutine_transfer(struct coroutine_context * current, struct coroutine_context * target);
static inline void coroutine_destroy(struct coroutine_context * context)
{
context->stack_pointer = NULL;
}
#endif /* COROUTINE_AMD64_CONTEXT_H */
|
