#define SYSCALL_NO_TLS 1
#include <stdint.h>
#include "syscall.h"

struct user_desc {
	uint32_t entry_number;
	uint32_t base_addr;
	uint32_t limit;
	uint32_t flags;
};

static int entry_number = -1;

int __set_thread_area_2(void *p)
{
	struct user_desc desc = {
		entry_number, (uintptr_t)p, 0xfffff, 0x51
	};
	int r = __syscall(SYS_set_thread_area, &desc);
	if (!r) {
		entry_number = desc.entry_number;
		__asm__ __volatile__ ("mov %0,%%gs" :
			: "r"(3+8*desc.entry_number));
		return 0;
	}
	desc.entry_number = 0;
	r = __syscall(SYS_modify_ldt, 1, &desc, 16);
	if (!r) {
		__asm__ __volatile__ ("mov %0,%%gs" :
			: "r"(7));
		return 1;
	}
	return r;
}