Contributors: 5
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Paolo 'Blaisorblade' Giarrusso |
119 |
48.18% |
2 |
28.57% |
| Al Viro |
118 |
47.77% |
2 |
28.57% |
| Arnd Bergmann |
6 |
2.43% |
1 |
14.29% |
| Jeff Dike |
3 |
1.21% |
1 |
14.29% |
| Greg Kroah-Hartman |
1 |
0.40% |
1 |
14.29% |
| Total |
247 |
|
7 |
|
// SPDX-License-Identifier: GPL-2.0
#include <errno.h>
#include <linux/unistd.h>
#include <sys/ptrace.h>
#include <sys/syscall.h>
#include <unistd.h>
#include <sysdep/tls.h>
#ifndef PTRACE_GET_THREAD_AREA
#define PTRACE_GET_THREAD_AREA 25
#endif
#ifndef PTRACE_SET_THREAD_AREA
#define PTRACE_SET_THREAD_AREA 26
#endif
/* Checks whether host supports TLS, and sets *tls_min according to the value
* valid on the host.
* i386 host have it == 6; x86_64 host have it == 12, for i386 emulation. */
void check_host_supports_tls(int *supports_tls, int *tls_min)
{
/* Values for x86 and x86_64.*/
int val[] = {GDT_ENTRY_TLS_MIN_I386, GDT_ENTRY_TLS_MIN_X86_64};
int i;
for (i = 0; i < ARRAY_SIZE(val); i++) {
user_desc_t info;
info.entry_number = val[i];
if (syscall(__NR_get_thread_area, &info) == 0) {
*tls_min = val[i];
*supports_tls = 1;
return;
} else {
if (errno == EINVAL)
continue;
else if (errno == ENOSYS)
*supports_tls = 0;
return;
}
}
*supports_tls = 0;
}
int os_set_thread_area(user_desc_t *info, int pid)
{
int ret;
ret = ptrace(PTRACE_SET_THREAD_AREA, pid, info->entry_number,
(unsigned long) info);
if (ret < 0)
ret = -errno;
return ret;
}
int os_get_thread_area(user_desc_t *info, int pid)
{
int ret;
ret = ptrace(PTRACE_GET_THREAD_AREA, pid, info->entry_number,
(unsigned long) info);
if (ret < 0)
ret = -errno;
return ret;
}