deduplicate __pthread_self thread pointer adjustment out of each arch

the adjustment made is entirely a function of TLS_ABOVE_TP and
TP_OFFSET. aside from avoiding repetition of the TP_OFFSET value and
arithmetic, this change makes pthread_arch.h independent of the
definition of struct __pthread from pthread_impl.h. this in turn will
allow inclusion of pthread_arch.h to be moved to the top of
pthread_impl.h so that it can influence the definition of the
structure.

previously, arch files were very inconsistent about the type used for
the thread pointer. this change unifies the new __get_tp interface to
always use uintptr_t, which is the most correct when performing
arithmetic that may involve addresses outside the actual pointed-to
object (due to TP_OFFSET).

1 files changed, 4 insertions, 4 deletions

diff --git a/arch/s390x/pthread_arch.h b/arch/s390x/pthread_arch.h
index 5d22546b..e54fec3f 100644
--- a/arch/s390x/pthread_arch.h
+++ b/arch/s390x/pthread_arch.h
@@ -1,12 +1,12 @@
-static inline struct pthread *__pthread_self()
+static inline uintptr_t __get_tp()
 {
-	struct pthread *self;
+	uintptr_t tp;
 	__asm__ (
 		"ear  %0, %%a0\n"
 		"sllg %0, %0, 32\n"
 		"ear  %0, %%a1\n"
-		: "=r"(self));
-	return self;
+		: "=r"(tp));
+	return tp;
 }
 
 #define MC_PC psw.addr