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/mips/pthread_arch.h b/arch/mips/pthread_arch.h
index c22eb34d..c45347ab 100644
--- a/arch/mips/pthread_arch.h
+++ b/arch/mips/pthread_arch.h
@@ -1,13 +1,13 @@
-static inline struct pthread *__pthread_self()
+static inline uintptr_t __get_tp()
 {
 #if __mips_isa_rev < 2
-	register char *tp __asm__("$3");
+	register uintptr_t tp __asm__("$3");
 	__asm__ (".word 0x7c03e83b" : "=r" (tp) );
 #else
-	char *tp;
+	uintptr_t tp;
 	__asm__ ("rdhwr %0, $29" : "=r" (tp) );
 #endif
-	return (pthread_t)(tp - 0x7000 - sizeof(struct pthread));
+	return tp;
 }
 
 #define TLS_ABOVE_TP