59 lines
1.5 KiB
C
59 lines
1.5 KiB
C
#ifndef COROUTINE_PPC_CONTEXT_H
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#define COROUTINE_PPC_CONTEXT_H 1
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#pragma once
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#include <assert.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <string.h>
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#define COROUTINE __attribute__((noreturn)) void
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#define COROUTINE_LIMITED_ADDRESS_SPACE
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enum {
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COROUTINE_REGISTERS =
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20 /* 19 general purpose registers (r13–r31) and 1 return address */
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+ 4 /* space for fiber_entry() to store the link register */
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};
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struct coroutine_context
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{
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void **stack_pointer;
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void *argument;
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};
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typedef COROUTINE(* coroutine_start)(struct coroutine_context *from, struct coroutine_context *self);
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static inline void coroutine_initialize_main(struct coroutine_context * context) {
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context->stack_pointer = NULL;
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}
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static inline void coroutine_initialize(
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struct coroutine_context *context,
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coroutine_start start,
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void *stack,
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size_t size
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) {
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assert(start && stack && size >= 1024);
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// Stack grows down. Force 16-byte alignment.
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char * top = (char*)stack + size;
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context->stack_pointer = (void**)((uintptr_t)top & ~0xF);
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context->stack_pointer -= COROUTINE_REGISTERS;
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memset(context->stack_pointer, 0, sizeof(void*) * COROUTINE_REGISTERS);
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/* Skip a global prologue that sets the TOC register */
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context->stack_pointer[19] = ((char*)start) + 8;
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}
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struct coroutine_context * coroutine_transfer(struct coroutine_context * current, struct coroutine_context * target);
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static inline void coroutine_destroy(struct coroutine_context * context)
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{
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context->stack_pointer = NULL;
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}
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#endif /* COROUTINE_PPC_CONTEXT_H */
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