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Commit | Line | Data |
---|---|---|
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> |
b428b51e 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 | ||
3feb8856 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 |
21 | void check_host_supports_tls(int *supports_tls, int *tls_min) |
22 | { | |
3feb8856 PBG |
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) { |
3feb8856 PBG |
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 | |
47 | int 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 | ||
58 | int 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 | } |