2009-04-22 20:04:28 +02:00

82 lines
2.2 KiB
C
Executable File

/*
libco.x86-64 (2008-01-28)
author: byuu
license: public domain
*/
#define LIBCO_C
#include "libco.h"
#include <assert.h>
#include <stdlib.h>
#ifdef __cplusplus
extern "C" {
#endif
static thread_local long co_active_buffer[32];
static thread_local cothread_t co_active_ = 0;
static void crash() {
assert(0); /* called only if cothread_t entrypoint returns */
}
cothread_t co_active() {
if(!co_active_) co_active_ = &co_active_buffer;
return co_active_;
}
cothread_t co_create(unsigned int size, void (*entrypoint)(void)) {
cothread_t handle;
assert(sizeof(long) == 8);
if(!co_active_) co_active_ = &co_active_buffer;
size += 128; /* allocate additional space for storage */
size &= ~15; /* align stack to 16-byte boundary */
if(handle = (cothread_t)calloc(size, 1)) {
long *p = (long*)((char*)handle + size); /* seek to top of stack */
*--p = (long)crash; /* crash if entrypoint returns */
*--p = (long)entrypoint; /* start of function */
*(long*)handle = (long)p; /* stack pointer */
}
return handle;
}
void co_delete(cothread_t handle) {
free(handle);
}
void co_switch(cothread_t to) {
register long stack = *(long*)to; /* stack[0] = "to" thread entry point */
register cothread_t from = co_active_;
co_active_ = to;
__asm__ __volatile__(
"movq %%rsp,(%1) \n\t" /* save old stack pointer */
"movq (%0),%%rsp \n\t" /* load new stack pointer */
"addq $8,%%rsp \n\t" /* "pop" return address off stack */
"movq %%rbp, 8(%1) \n\t" /* backup non-volatile registers */
"movq %%rbx,16(%1) \n\t"
"movq %%r12,24(%1) \n\t"
"movq %%r13,32(%1) \n\t"
"movq %%r14,40(%1) \n\t"
"movq %%r15,48(%1) \n\t"
"movq 8(%0),%%rbp \n\t" /* restore non-volatile registers */
"movq 16(%0),%%rbx \n\t"
"movq 24(%0),%%r12 \n\t"
"movq 32(%0),%%r13 \n\t"
"movq 40(%0),%%r14 \n\t"
"movq 48(%0),%%r15 \n\t"
"jmp *(%2) \n\t" /* jump into "to" thread */
: /* no outputs */
: "r" (to), "r" (from), "r" (stack)
);
}
#ifdef __cplusplus
}
#endif