83 lines
2 KiB
C
83 lines
2 KiB
C
#define LIBCO_C
|
|
#include "libco.h"
|
|
#include "settings.h"
|
|
|
|
#include <assert.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
#include <sys/mman.h>
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
static thread_local unsigned long co_active_buffer[64];
|
|
static thread_local cothread_t co_active_handle = 0;
|
|
static void (*co_swap)(cothread_t, cothread_t) = 0;
|
|
|
|
#ifdef LIBCO_MPROTECT
|
|
alignas(4096)
|
|
#else
|
|
section(text)
|
|
#endif
|
|
static const unsigned long co_swap_function[1024] = {
|
|
0xe8a16ff0, /* stmia r1!, {r4-r11,sp,lr} */
|
|
0xe8b0aff0, /* ldmia r0!, {r4-r11,sp,pc} */
|
|
0xe12fff1e, /* bx lr */
|
|
};
|
|
|
|
static void co_init() {
|
|
#ifdef LIBCO_MPROTECT
|
|
unsigned long addr = (unsigned long)co_swap_function;
|
|
unsigned long base = addr - (addr % sysconf(_SC_PAGESIZE));
|
|
unsigned long size = (addr - base) + sizeof co_swap_function;
|
|
mprotect((void*)base, size, PROT_READ | PROT_EXEC);
|
|
#endif
|
|
}
|
|
|
|
cothread_t co_active() {
|
|
if(!co_active_handle) co_active_handle = &co_active_buffer;
|
|
return co_active_handle;
|
|
}
|
|
|
|
cothread_t co_derive(void* memory, unsigned int size, void (*entrypoint)(void)) {
|
|
unsigned long* handle;
|
|
if(!co_swap) {
|
|
co_init();
|
|
co_swap = (void (*)(cothread_t, cothread_t))co_swap_function;
|
|
}
|
|
if(!co_active_handle) co_active_handle = &co_active_buffer;
|
|
|
|
if((handle = (unsigned long*)memory)) {
|
|
unsigned int offset = (size & ~15);
|
|
unsigned long* p = (unsigned long*)((unsigned char*)handle + offset);
|
|
handle[8] = (unsigned long)p;
|
|
handle[9] = (unsigned long)entrypoint;
|
|
}
|
|
|
|
return handle;
|
|
}
|
|
|
|
cothread_t co_create(unsigned int size, void (*entrypoint)(void)) {
|
|
void* memory = malloc(size);
|
|
if(!memory) return (cothread_t)0;
|
|
return co_derive(memory, size, entrypoint);
|
|
}
|
|
|
|
void co_delete(cothread_t handle) {
|
|
free(handle);
|
|
}
|
|
|
|
void co_switch(cothread_t handle) {
|
|
cothread_t co_previous_handle = co_active_handle;
|
|
co_swap(co_active_handle = handle, co_previous_handle);
|
|
}
|
|
|
|
int co_serializable() {
|
|
return 1;
|
|
}
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|