1 // SPDX-License-Identifier: GPL-2.0
3 #include <linux/unistd.h>
5 #include <sys/ptrace.h>
6 #include <sys/syscall.h>
9 #include <sysdep/tls.h>
11 #ifndef PTRACE_GET_THREAD_AREA
12 #define PTRACE_GET_THREAD_AREA 25
15 #ifndef PTRACE_SET_THREAD_AREA
16 #define PTRACE_SET_THREAD_AREA 26
19 /* Checks whether host supports TLS, and sets *tls_min according to the value
21 * i386 host have it == 6; x86_64 host have it == 12, for i386 emulation. */
22 void check_host_supports_tls(int *supports_tls, int *tls_min)
24 /* Values for x86 and x86_64.*/
25 int val[] = {GDT_ENTRY_TLS_MIN_I386, GDT_ENTRY_TLS_MIN_X86_64};
28 for (i = 0; i < ARRAY_SIZE(val); i++) {
30 info.entry_number = val[i];
32 if (syscall(__NR_get_thread_area, &info) == 0) {
39 else if (errno == ENOSYS)
48 int os_set_thread_area(user_desc_t *info, int pid)
52 ret = ptrace(PTRACE_SET_THREAD_AREA, pid, info->entry_number,
53 (unsigned long) info);
59 int os_get_thread_area(user_desc_t *info, int pid)
63 ret = ptrace(PTRACE_GET_THREAD_AREA, pid, info->entry_number,
64 (unsigned long) info);