#include <u.h>
#include <rt.h>
#include <elf.h>

/* tell linker to go find */
int atexit(void (*)(void));
int __libc_start_main(int (*main)(int,char **,char **), int argc, char **argv);

void rt·clean(void);
void rt·guardstack(void);

#define NAUX 38
static void
rt·init(char **env, char *program)
{
	uintptr i, *auxv, aux[NAUX];
	for(i=0; env[i]; i++)
		;
	rt·context.auxv = auxv = (void *)(env+i+1);
	for(i=0; auxv[i]; i+=2)
		if(auxv[i]<NAUX)
			aux[auxv[i]] = auxv[i+1];

	rt·context.sysinfo  = aux[AT_SYSINFO];
	rt·context.pagesize = aux[AT_PAGESZ];
    rt·guardstack();
}

int
rt·boot(int (*main)(), int argc, char **argv, void (*init)(), void (*fini)(), void (*exit)())
{
	char **env = argv+argc+1;
	rt·init(env, argv[0]);

	/* ring libc, anyone home? */
    atexit(rt·clean);
	__libc_start_main(main, argc, argv);

	/* no? ok we continue on if there is no libc linked */
	init();
	if(fini)
		rt·context.fini = fini;
	if(exit)
		rt·context.exit = exit;

	rt·exit(main(argc, argv, env));
}