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authorAl Viro <viro@ftp.linux.org.uk>2011-08-18 20:09:49 +0100
committerRichard Weinberger <richard@nod.at>2011-11-02 14:15:17 +0100
commit1bbd5f21f426d99660ea8120b79595a282e5ff8a (patch)
treef9980460722d4f89ca468c7af92502daa82d8c1a /arch/x86
parentc5cc32fe14ccbc19484202d20cf7d6bad45e3567 (diff)
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um: merge os-Linux/tls.c into arch/x86/um/os-Linux/tls.c
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>
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/um/os-Linux/tls.c34
-rw-r--r--arch/x86/um/shared/sysdep/tls.h3
2 files changed, 36 insertions, 1 deletions
diff --git a/arch/x86/um/os-Linux/tls.c b/arch/x86/um/os-Linux/tls.c
index 281e83ecce3d..82276b6071af 100644
--- a/arch/x86/um/os-Linux/tls.c
+++ b/arch/x86/um/os-Linux/tls.c
@@ -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;
+}
diff --git a/arch/x86/um/shared/sysdep/tls.h b/arch/x86/um/shared/sysdep/tls.h
index db2ae9c12e23..f2f30bd67b9b 100644
--- a/arch/x86/um/shared/sysdep/tls.h
+++ b/arch/x86/um/shared/sysdep/tls.h
@@ -29,6 +29,9 @@ typedef struct user_desc user_desc_t;
# endif /* __KERNEL__ */
+extern int os_set_thread_area(user_desc_t *info, int pid);
+extern int os_get_thread_area(user_desc_t *info, int pid);
+
#ifdef __i386__
#define GDT_ENTRY_TLS_MIN_I386 6
#define GDT_ENTRY_TLS_MIN_X86_64 12