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had _SHARED defined during compilation, each of them would contain an assignment of stage0_printk to *printk. During linking, this caused errors as multiple definitions of printk existed. Make sure _SHARED alone gives you only the printk prototype, and iff _MAINOBJECT is defined as well, include the assignment. Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net> Acked-by: Uwe Hermann <uwe@hermann-uwe.de> git-svn-id: svn://coreboot.org/repository/LinuxBIOSv3@516 f3766cd6-281f-0410-b1cd-43a5c92072e9
88 lines
2.8 KiB
C
88 lines
2.8 KiB
C
/*
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* This file is part of the LinuxBIOS project
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*
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* Copyright(C) 2007 coresystems GmbH
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* Written by Stefan Reinauer <stepan@coresystems.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef SHARED_H
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#define SHARED_H
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#ifdef _SHARED
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/* _SHARED mode enforces some functions to be called with an
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* absolute address, even in PIE mode. This is required since
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* the relative distance between XIP code and stage 0 is not known
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*/
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#define FUNC(func, ret, attr, args...) \
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ret stage0_##func(args) attr
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/*
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* The introduction of the _SHARED macros had one flaw: If multiple files
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* had _SHARED defined during compilation, each of them would contain an
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* assignment of stage0_printk to *printk. During linking, this caused
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* errors as multiple definitions of printk existed.
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* Make sure _SHARED alone gives you only the printk prototype, and iff
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* _MAINOBJECT is defined as well, include the assignment.
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*/
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#ifdef _MAINOBJECT
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#define EXTERN(func, ret, attr, args...) \
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ret (*func)(args) attr= stage0_##func
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#else
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#define EXTERN(func, ret, attr, args...) \
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ret *func(args) attr
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#endif
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#else
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#define FUNC(func, ret, attr, args...) \
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ret func(args) attr
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#define EXTERN(func, ret, attr, args...)
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#endif
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/**
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* Use the SHARED macro to create a universally usable function
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* prototype. This will create a function prototype in stage 0 and
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* a function prototype plus a function pointer for all code compiled
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* with _SHARED defined (required for XIP code)
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*
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* @func function name
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* @ret return value
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* @args function arguments
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*/
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#define SHARED(func,ret,args...) \
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FUNC(func,ret,,##args); \
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EXTERN(func,ret,,##args)
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/**
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* Use the SHARED_WITH_ATTRIBUTES macro to create a universally usable function
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* prototype for a function using GCC attributes.
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* This macro works identically to SHARED(), but it adds a GCC attribute to the
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* function. So far we use this to have printk parameters tested with a
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* "format" attribute.
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*
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* @func function name
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* @ret return value
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* @attr function attributes
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* @args function arguments
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*/
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#define SHARED_WITH_ATTRIBUTES(func,ret,attr,args...) \
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FUNC(func,ret,attr,##args); \
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EXTERN(func,ret,attr,##args)
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#endif /* SHARED_H */
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