The ABI wrapper from r775 made the SHARED definitions obsolete. They're

not that readable anyway, so kill them and use standard definitions
instead.

Introduce EXPORT_SYMBOL for shared symbols. EXPORT_SYMBOL tells the
compiler to use the standard calling conventions for a given symbol and
not to optimize it away.
Benefits:
- We can later use gcc -combine -fwhole-program without problems.
- It's a correctness fix for some optimizations.
- We could check for duplicated exported functions at link time.
- We could check whether exported functions are linked into initram or
stage2 by accident.
- We could generate usage statistics and possibly optimize away unused
shared functions.
- Through the above points, significant side reductions of 10-40%

Build and boot tested on qemu.
Build tested on all targets.

Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Ronald G. Minnich <rminnich@gmail.com>


git-svn-id: svn://coreboot.org/repository/coreboot-v3@780 f3766cd6-281f-0410-b1cd-43a5c92072e9

include/shared.h

@@ -1,8 +1,7 @@
 /*
  * This file is part of the coreboot project
  *
- * Copyright(C) 2007 coresystems GmbH
- * Written by Stefan Reinauer <stepan@coresystems.de>
+ * Copyright(C) 2008 Carl-Daniel Hailfinger
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -22,41 +21,6 @@
 #ifndef SHARED_H
 #define SHARED_H
 
-#define FUNC(func, ret, attr, args...)   \
-	ret func(args) attr
-#define EXTERN(func, ret, attr, args...)
-
-/**
- * Use the SHARED macro to create a universally usable function 
- * prototype. This will create a function prototype in stage 0 and
- * a function prototype plus a function pointer for all code compiled
- * with _SHARED defined (required for XIP code)
- *
- * @func   function name
- * @ret    return value
- * @args   function arguments
- */
-
-#define SHARED(func,ret,args...) \
-	FUNC(func,ret,,##args);  \
-	EXTERN(func,ret,,##args)
-
-
-/**
- * Use the SHARED_WITH_ATTRIBUTES macro to create a universally usable function 
- * prototype for a function using GCC attributes. 
- * This macro works identically to SHARED(), but it adds a GCC attribute to the
- * function. So far we use this to have printk parameters tested with a
- * "format" attribute.
- *
- * @func   function name
- * @ret    return value
- * @attr   function attributes
- * @args   function arguments
- */
-
-#define SHARED_WITH_ATTRIBUTES(func,ret,attr,args...) \
-	FUNC(func,ret,attr,##args);  \
-	EXTERN(func,ret,attr,##args)
+#define EXPORT_SYMBOL(sym) extern typeof(sym) sym __attribute__((externally_visible,used))
 
 #endif /* SHARED_H */