[PATCH 3/5] [PowerPC] Relocate stinfo->main

[Alan Modra]

The previous 2 patches got us to the point of segfaulting when trying
to transfer to main.

start_addresses in sysdeps/powerpc/powerpc64/start.S is historical
baggage that should disappear.  Until someone does that, relocating
stinfo->main by hand is one solution to the fact that the field may be
unrelocated at the time it is accessed.  This is similar to what is
done for dynamic tags via the D_PTR macro.  The makefile change is
needed to pick up elf/dl-static-tls.h from dl-machine.h.

diff --git a/sysdeps/unix/sysv/linux/powerpc/Makefile b/sysdeps/unix/sysv/linux/powerpc/Makefile
index fc7c29c695..93783cae00 100644
--- a/sysdeps/unix/sysv/linux/powerpc/Makefile
+++ b/sysdeps/unix/sysv/linux/powerpc/Makefile
@@ -27,3 +27,9 @@ tests += $(tests-static)
 tests += test-gettimebasefreq
 tests += test-powerpc-linux-sysconf
 endif
+
+ifeq ($(subdir),csu)
+# to relocate stinfo->main
+CPPFLAGS-libc-start.o += -I../elf
+CPPFLAGS-libc-start.op += -I../elf
+endif
diff --git a/sysdeps/unix/sysv/linux/powerpc/libc-start.c b/sysdeps/unix/sysv/linux/powerpc/libc-start.c
index bb97d16145..8f0d3a0eac 100644
--- a/sysdeps/unix/sysv/linux/powerpc/libc-start.c
+++ b/sysdeps/unix/sysv/linux/powerpc/libc-start.c
@@ -23,6 +23,10 @@
 #ifndef SHARED
 #include <hwcapinfo.h>
 #endif
+#if ENABLE_STATIC_PIE && !defined SHARED
+/* For elf_machine_load_address.  */
+#include <dl-machine.h>
+#endif
 
 /* The main work is done in the generic function.  */
 #define LIBC_START_MAIN generic_start_main
@@ -95,8 +99,15 @@ __libc_start_main_impl (int argc, char **argv,
   __tcb_parse_hwcap_and_convert_at_platform ();
 #endif
 
-  return generic_start_main (stinfo->main, argc, argv, auxvec,
-			     stinfo->init, stinfo->fini, rtld_fini,
+  void *main = stinfo->main;
+#if ENABLE_STATIC_PIE && !defined SHARED
+  struct link_map *map = _dl_get_dl_main_map ();
+  if (!map->l_relocated)
+    main = (char *) main + elf_machine_load_address ();
+#endif
+
+  return generic_start_main (main, argc, argv, auxvec,
+			     NULL, NULL, rtld_fini,
 			     stack_on_entry);
 }
 DEFINE_LIBC_START_MAIN_VERSION

-- 
Alan Modra
Australia Development Lab, IBM