Change libphoenix initialization

This change prepares libphoenix to be used in dynamic loader, where crt0
is not included.

Moved constructor and destrutor calling into crt0.
Wrapped libphoenix initialization into a single function to reduce crt0
and libphoenix intertwine.

JIRA: RTOS-694

crt0-common.c

@@ -5,47 +5,84 @@
  *
  * Entrypoint
  *
- * Copyright 2017, 2018 Phoenix Systems
- * Author: Pawel Pisarczyk, Aleksander Kaminski
+ * Copyright 2017, 2018, 2023 Phoenix Systems
+ * Author: Pawel Pisarczyk, Aleksander Kaminski, Hubert Badocha
  *
  * This file is part of Phoenix-RTOS.
  *
  * %LICENSE%
  */
 
-#include <sys/file.h>
 #include <stdlib.h>
-#include <stdio.h>
 
 
-extern void _malloc_init(void);
-extern int _env_init(void);
-extern void _signals_init(void);
-extern void _file_init(void);
-extern void _errno_init(void);
-extern void _atexit_init(void);
-extern void _init_array(void);
-extern void _pthread_init(void);
+extern void (*__preinit_array_start[])(void);
+extern void (*__preinit_array_end[])(void);
+
+extern void (*__init_array_start[])(void);
+extern void (*__init_array_end[])(void);
+
+
+extern void _init(void);
+
+
+__attribute__((noinline)) static void _init_array(void)
+{
+	size_t i, sz;
+
+	sz = __preinit_array_end - __preinit_array_start;
+	for (i = 0; i < sz; i++) {
+		__preinit_array_start[i]();
+	}
+
+	/* FIXME: change compilation settings to make access to _init() */
+	/* _init(); */
+
+	sz = __init_array_end - __init_array_start;
+	for (i = 0; i < sz; i++) {
+		__init_array_start[i]();
+	}
+}
+
+
+extern void (*__fini_array_start[])(void);
+extern void (*__fini_array_end[])(void);
+
+
+extern void _fini(void);
+
+
+static void _fini_array(void)
+{
+	size_t i, sz;
+
+	sz = __fini_array_end - __fini_array_start;
+	for (i = sz; i > 0; i--) {
+		__fini_array_start[i - 1]();
+	}
+
+	/* FIXME: change compilation settings to make access to _fini() */
+	/* _fini(); */
+}
+
+
+extern void _libc_init(void);
 extern int main(int argc, char **argv);
 
 
 char **environ;
 const char *argv_progname;
 
 
-void _startc(int argc, char **argv, char **env)
+__attribute__((noreturn)) void _startc(int argc, char **argv, char **env)
 {
 	environ = env;
 	argv_progname = *argv;
 
-	_atexit_init();
-	_errno_init();
-	_malloc_init();
-	_env_init();
-	_signals_init();
-	_file_init();
+	_libc_init();
+
+	atexit(_fini_array);
 	_init_array();
-	_pthread_init();
 
 	exit(main(argc, argv));
 }

misc/Makefile

@@ -4,4 +4,4 @@
 # Copyright 2021 Phoenix Systems
 #
 
-OBJS += $(addprefix $(PREFIX_O)misc/, init.o fini.o)
+OBJS += $(addprefix $(PREFIX_O)misc/, init.o)

misc/init.c

@@ -3,40 +3,34 @@
  *
  * libphoenix
  *
- * init array
+ * init
  *
- * Copyright 2021 Phoenix Systems
- * Author: Hubert Buczynski
+ * Copyright 2021, 2023 Phoenix Systems
+ * Author: Hubert Buczynski, Hubert Badocha
  *
  * This file is part of Phoenix-RTOS.
  *
  * %LICENSE%
  */
 
 
-#include <stdlib.h>
+extern void _malloc_init(void);
+extern int _env_init(void);
+extern void _signals_init(void);
+extern void _file_init(void);
+extern void _errno_init(void);
+extern void _atexit_init(void);
+extern void _init_array(void);
+extern void _pthread_init(void);
 
-extern void (*__preinit_array_start[])(void);
-extern void (*__preinit_array_end[])(void);
 
-extern void (*__init_array_start[])(void);
-extern void (*__init_array_end[])(void);
-
-
-extern void _init (void);
-
-void _init_array(void)
+void _libc_init(void)
 {
-	size_t i, sz;
-
-	sz = __preinit_array_end - __preinit_array_start;
-	for (i = 0; i < sz; i++)
-		__preinit_array_start[i]();
-
-	/* FIXME: change compilation settings to make access to _init() */
-	/* _init(); */
-
-	sz = __init_array_end - __init_array_start;
-	for (i = 0; i < sz; i++)
-		__init_array_start[i]();
+	_atexit_init();
+	_errno_init();
+	_malloc_init();
+	_env_init();
+	_signals_init();
+	_file_init();
+	_pthread_init();
 }

stdlib/exit.c

@@ -17,7 +17,6 @@
 #include <stdio.h>
 
 extern void _atexit_call(void);
-extern void _fini_array(void);
 extern void sys_exit(int) __attribute__((noreturn));
 
 
@@ -37,7 +36,6 @@ void exit(int status)
 {
 	fflush(NULL);
 	_atexit_call();
-	_fini_array();
 	_exit(status);
 	for(;;);
 }