Commit | Line | Data |
---|---|---|
b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
a5d2f46a | 2 | #include <errno.h> |
3feb8856 | 3 | #include <linux/unistd.h> |
b428b51e | 4 | |
1bbd5f21 | 5 | #include <sys/ptrace.h> |
5f4c6bc1 | 6 | #include <sys/syscall.h> |
b428b51e PBG |
7 | #include <unistd.h> |
8 | ||
37185b33 | 9 | #include <sysdep/tls.h> |
3feb8856 | 10 | |
1bbd5f21 AV |
11 | #ifndef PTRACE_GET_THREAD_AREA |
12 | #define PTRACE_GET_THREAD_AREA 25 | |
13 | #endif | |
14 | ||
15 | #ifndef PTRACE_SET_THREAD_AREA | |
16 | #define PTRACE_SET_THREAD_AREA 26 | |
17 | #endif | |
18 | ||
3feb8856 PBG |
19 | /* Checks whether host supports TLS, and sets *tls_min according to the value |
20 | * valid on the host. | |
21 | * i386 host have it == 6; x86_64 host have it == 12, for i386 emulation. */ | |
1bbd5f21 AV |
22 | void check_host_supports_tls(int *supports_tls, int *tls_min) |
23 | { | |
3feb8856 PBG |
24 | /* Values for x86 and x86_64.*/ |
25 | int val[] = {GDT_ENTRY_TLS_MIN_I386, GDT_ENTRY_TLS_MIN_X86_64}; | |
26 | int i; | |
27 | ||
28 | for (i = 0; i < ARRAY_SIZE(val); i++) { | |
29 | user_desc_t info; | |
30 | info.entry_number = val[i]; | |
31 | ||
5f4c6bc1 | 32 | if (syscall(__NR_get_thread_area, &info) == 0) { |
3feb8856 PBG |
33 | *tls_min = val[i]; |
34 | *supports_tls = 1; | |
35 | return; | |
36 | } else { | |
37 | if (errno == EINVAL) | |
38 | continue; | |
39 | else if (errno == ENOSYS) | |
40 | *supports_tls = 0; | |
7b24afbf | 41 | return; |
3feb8856 PBG |
42 | } |
43 | } | |
44 | ||
45 | *supports_tls = 0; | |
46 | } | |
1bbd5f21 AV |
47 | |
48 | int os_set_thread_area(user_desc_t *info, int pid) | |
49 | { | |
50 | int ret; | |
51 | ||
52 | ret = ptrace(PTRACE_SET_THREAD_AREA, pid, info->entry_number, | |
53 | (unsigned long) info); | |
54 | if (ret < 0) | |
55 | ret = -errno; | |
56 | return ret; | |
57 | } | |
58 | ||
59 | int os_get_thread_area(user_desc_t *info, int pid) | |
60 | { | |
61 | int ret; | |
62 | ||
63 | ret = ptrace(PTRACE_GET_THREAD_AREA, pid, info->entry_number, | |
64 | (unsigned long) info); | |
65 | if (ret < 0) | |
66 | ret = -errno; | |
67 | return ret; | |
68 | } |