Introduce <elf-initfini.h> and ELF_INITFINI for all architectures

This supersedes the init_array sysdeps directory.  It allows us to
check for ELF_INITFINI in both C and assembler code, and skip DT_INIT
and DT_FINI processing completely on newer architectures.

A new header file is needed because <dl-machine.h> is incompatible
with assembler code.  <sysdep.h> is compatible with assembler code,
but it cannot be included in all assembler files because on some
architectures, it redefines register names, and some assembler files
conflict with that.

<elf-initfini.h> is replicated for legacy architectures which need
DT_INIT/DT_FINI support.  New architectures follow the generic default
and disable it.

1 files changed, 8 insertions, 0 deletions

diff --git a/csu/gmon-start.c b/csu/gmon-start.c
index 2803be342a..da9f04c522 100644
--- a/csu/gmon-start.c
+++ b/csu/gmon-start.c
@@ -37,6 +37,7 @@
 #include <sys/gmon.h>
 #include <stdlib.h>
 #include <unistd.h>
+#include <elf-initfini.h>
 #define __ASSEMBLY__
 #include <entry.h>
 
@@ -59,6 +60,13 @@ extern char etext[];
 # endif
 #endif
 
+#if !ELF_INITFINI
+/* Instead of defining __gmon_start__ globally in gcrt1.o, we make it
+   static and just put a pointer to it into the .preinit_array
+   section.  */
+# define GMON_START_ARRAY_SECTION ".preinit_array"
+#endif
+
 #ifdef GMON_START_ARRAY_SECTION
 static void __gmon_start__ (void);
 static void (*const gmon_start_initializer) (void)