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>
git-mirror · Nov 2, 2011 · 1bbd5f2 · 1bbd5f2
1 parent c5cc32f
commit 1bbd5f2
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Showing 5 changed files with 38 additions and 43 deletions.
diff --git a/arch/um/include/shared/os.h b/arch/um/include/shared/os.h
@@ -10,7 +10,6 @@
 #include "irq_user.h"
 #include "longjmp.h"
 #include "mm_id.h"
-#include "sysdep/tls.h"
 
 #define CATCH_EINTR(expr) while ((errno = 0, ((expr) < 0)) && (errno == EINTR))
 
@@ -212,10 +211,6 @@ extern int run_helper_thread(int (*proc)(void *), void *arg,
 extern int helper_wait(int pid);
 
 
-/* tls.c */
-extern int os_set_thread_area(user_desc_t *info, int pid);
-extern int os_get_thread_area(user_desc_t *info, int pid);
-
 /* umid.c */
 extern int umid_file_name(char *name, char *buf, int len);
 extern int set_umid(char *name);

diff --git a/arch/um/os-Linux/Makefile b/arch/um/os-Linux/Makefile
@@ -5,13 +5,13 @@
 
 obj-y = aio.o execvp.o file.o helper.o irq.o main.o mem.o process.o \
 	registers.o sigio.o signal.o start_up.o time.o tty.o \
-	umid.o tls.o user_syms.o util.o drivers/ skas/
+	umid.o user_syms.o util.o drivers/ skas/
 
 obj-$(CONFIG_ARCH_REUSE_HOST_VSYSCALL_AREA) += elf_aux.o
 
 USER_OBJS := $(user-objs-y) aio.o elf_aux.o execvp.o file.o helper.o irq.o \
 	main.o mem.o process.o registers.o sigio.o signal.o start_up.o time.o \
-	tty.o tls.o umid.o util.o
+	tty.o umid.o util.o
 
 CFLAGS_user_syms.o += -DSUBARCH_$(SUBARCH)
 

diff --git a/arch/um/os-Linux/tls.c b/arch/um/os-Linux/tls.c
diff --git 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
@@ -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