um: get rid of pointless include "..." where include <...> will do
[deliverable/linux.git] / arch / x86 / um / os-Linux / tls.c
CommitLineData
a5d2f46a 1#include <errno.h>
3feb8856 2#include <linux/unistd.h>
b428b51e 3
1bbd5f21 4#include <sys/ptrace.h>
5f4c6bc1 5#include <sys/syscall.h>
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PBG
6#include <unistd.h>
7
37185b33 8#include <sysdep/tls.h>
3feb8856 9
1bbd5f21
AV
10#ifndef PTRACE_GET_THREAD_AREA
11#define PTRACE_GET_THREAD_AREA 25
12#endif
13
14#ifndef PTRACE_SET_THREAD_AREA
15#define PTRACE_SET_THREAD_AREA 26
16#endif
17
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PBG
18/* Checks whether host supports TLS, and sets *tls_min according to the value
19 * valid on the host.
20 * i386 host have it == 6; x86_64 host have it == 12, for i386 emulation. */
1bbd5f21
AV
21void check_host_supports_tls(int *supports_tls, int *tls_min)
22{
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23 /* Values for x86 and x86_64.*/
24 int val[] = {GDT_ENTRY_TLS_MIN_I386, GDT_ENTRY_TLS_MIN_X86_64};
25 int i;
26
27 for (i = 0; i < ARRAY_SIZE(val); i++) {
28 user_desc_t info;
29 info.entry_number = val[i];
30
5f4c6bc1 31 if (syscall(__NR_get_thread_area, &info) == 0) {
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32 *tls_min = val[i];
33 *supports_tls = 1;
34 return;
35 } else {
36 if (errno == EINVAL)
37 continue;
38 else if (errno == ENOSYS)
39 *supports_tls = 0;
40 return;
41 }
42 }
43
44 *supports_tls = 0;
45}
1bbd5f21
AV
46
47int os_set_thread_area(user_desc_t *info, int pid)
48{
49 int ret;
50
51 ret = ptrace(PTRACE_SET_THREAD_AREA, pid, info->entry_number,
52 (unsigned long) info);
53 if (ret < 0)
54 ret = -errno;
55 return ret;
56}
57
58int os_get_thread_area(user_desc_t *info, int pid)
59{
60 int ret;
61
62 ret = ptrace(PTRACE_GET_THREAD_AREA, pid, info->entry_number,
63 (unsigned long) info);
64 if (ret < 0)
65 ret = -errno;
66 return ret;
67}
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