arch/um/os-Linux/tls.c


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39

#include <errno.h>
#include <unistd.h>
#include <sys/ptrace.h>
#include <sys/syscall.h>
#include <asm/ldt.h>
#include "sysdep/tls.h"
#include "uml-config.h"

/* TLS support - we basically rely on the host's one.*/

#ifndef PTRACE_GET_THREAD_AREA
#define PTRACE_GET_THREAD_AREA 25
#endif

#ifndef PTRACE_SET_THREAD_AREA
#define PTRACE_SET_THREAD_AREA 26
#endif

int os_set_thread_area(user_desc_t *info, int pid)
{
	int ret;

	ret = ptrace(PTRACE_SET_THREAD_AREA, pid, info->entry_number,
		     (unsigned long) info);
	if (ret < 0)
		ret = -errno;
	return ret;
}

int os_get_thread_area(user_desc_t *info, int pid)
{
	int ret;

	ret = ptrace(PTRACE_GET_THREAD_AREA, pid, info->entry_number,
		     (unsigned long) info);
	if (ret < 0)
		ret = -errno;
	return ret;
}