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#pragma once
#include <assert.h>
#include <string.h>
#if __cplusplus
extern "C" {
#endif
#define COROUTINE __attribute__((noreturn)) void
const size_t COROUTINE_REGISTERS =
19 /* 18 general purpose registers (r14-r31) and 1 return address */
+ 4; /* space for fiber_entry() to store the link register */
typedef struct
{
void **stack_pointer;
} coroutine_context;
typedef COROUTINE(* coroutine_start)(coroutine_context *from, coroutine_context *self);
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;
}
context->stack_pointer -= COROUTINE_REGISTERS;
memset(context->stack_pointer, 0, sizeof(void*) * COROUTINE_REGISTERS);
/* Skip a global prologue that sets the TOC register */
context->stack_pointer[18] = ((char*)start) + 8;
}
coroutine_context * coroutine_transfer(coroutine_context * current, coroutine_context * target);
static inline void coroutine_destroy(coroutine_context * context)
{
context->stack_pointer = NULL;
}
#if __cplusplus
}
#endif
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