tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1#include <errno.h>
2#include <sys/ptrace.h>
3#include <asm/ldt.h>
4#include "sysdep/tls.h"
5#include "uml-config.h"
6
7/* TLS support - we basically rely on the host's one.*/
8
9/* In TT mode, this should be called only by the tracing thread, and makes sense
10 * only for PTRACE_SET_THREAD_AREA. In SKAS mode, it's used normally.
11 *
12 */
13
14#ifndef PTRACE_GET_THREAD_AREA
15#define PTRACE_GET_THREAD_AREA 25
16#endif
17
18#ifndef PTRACE_SET_THREAD_AREA
19#define PTRACE_SET_THREAD_AREA 26
20#endif
21
22int os_set_thread_area(user_desc_t *info, int pid)
23{
24 int ret;
25
26 ret = ptrace(PTRACE_SET_THREAD_AREA, pid, info->entry_number,
27 (unsigned long) info);
28 if (ret < 0)
29 ret = -errno;
30 return ret;
31}
32
33#ifdef UML_CONFIG_MODE_SKAS
34
35int os_get_thread_area(user_desc_t *info, int pid)
36{
37 int ret;
38
39 ret = ptrace(PTRACE_GET_THREAD_AREA, pid, info->entry_number,
40 (unsigned long) info);
41 if (ret < 0)
42 ret = -errno;
43 return ret;
44}
45
46#endif
47
48#ifdef UML_CONFIG_MODE_TT
49#include "linux/unistd.h"
50
51static _syscall1(int, get_thread_area, user_desc_t *, u_info);
52static _syscall1(int, set_thread_area, user_desc_t *, u_info);
53
54int do_set_thread_area_tt(user_desc_t *info)
55{
56 int ret;
57
58 ret = set_thread_area(info);
59 if (ret < 0) {
60 ret = -errno;
61 }
62 return ret;
63}
64
65int do_get_thread_area_tt(user_desc_t *info)
66{
67 int ret;
68
69 ret = get_thread_area(info);
70 if (ret < 0) {
71 ret = -errno;
72 }
73 return ret;
74}
75
76#endif /* UML_CONFIG_MODE_TT */