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um: merge os-Linux/tls.c into arch/x86/um/os-Linux/tls.c

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it's i386-specific; moreover, analogs on other targets have
incompatible interface - PTRACE_GET_THREAD_AREA does exist
elsewhere, but struct user_desc does *not*

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Al Viro
2011-08-18 20:09:49 +01:00
committed by Richard Weinberger
parent c5cc32fe14
commit 1bbd5f21f4
5 changed files with 38 additions and 43 deletions
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34
arch/x86/um/os-Linux/tls.c
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@ -1,15 +1,25 @@
#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) {
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;
@ -33,3 +43,25 @@ void check_host_supports_tls(int *supports_tls, int *tls_min) {
*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;
}