arm: setjmp/longjmp: fix PIC vs SHARED thinkos

The logic in setjmp/__longjmp incorrectly uses "PIC" to figure out
whether the code is going into a shared library when it should be
using "SHARED".  If you build glibc with a gcc version that has PIE
enabled by default, then the code will try to use symbols that are
only in the shared library.

URL: https://bugs.gentoo.org/336914

ChangeLog

@@ -1,3 +1,8 @@
+2015-09-18  David Lamparter  <equinox-gentoo@diac24.net>
+
+	* sysdeps/arm/setjmp.S: Change PIC to SHARED.
+	* sysdeps/arm/__longjmp.S: Likewise
+
 2015-09-18  Wilco Dijkstra  <wdijkstr@arm.com>
 
 	* sysdeps/ieee754/dbl-64/s_signbit.c (__signbit):

sysdeps/arm/__longjmp.S

@@ -81,7 +81,7 @@ ENTRY (__longjmp)
 		    C_SYMBOL_NAME(_rtld_local_ro) \
 		    + RTLD_GLOBAL_RO_DL_HWCAP_OFFSET)
 # else
-#  ifdef PIC
+#  ifdef SHARED
 	LDR_GLOBAL (a4, a3, C_SYMBOL_NAME(_rtld_global_ro), \
 		    RTLD_GLOBAL_RO_DL_HWCAP_OFFSET)
 #  else

sysdeps/arm/setjmp.S

@@ -62,7 +62,7 @@ ENTRY (__sigsetjmp)
 		    C_SYMBOL_NAME(_rtld_local_ro) \
 		    + RTLD_GLOBAL_RO_DL_HWCAP_OFFSET)
 # else
-#  ifdef PIC
+#  ifdef SHARED
 	LDR_GLOBAL (a3, a4, C_SYMBOL_NAME(_rtld_global_ro), \
 		    RTLD_GLOBAL_RO_DL_HWCAP_OFFSET)
 #  else