binman_sym.h
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/*
* Symbol access for symbols set up by binman as part of the build.
*
* This allows C code to access the position of a particular part of the image
* assembled by binman.
*
* Copyright (c) 2017 Google, Inc
*
* SPDX-License-Identifier: GPL-2.0+
*/
#ifndef __BINMAN_SYM_H
#define __BINMAN_SYM_H
#define BINMAN_SYM_MISSING (-1UL)
#ifdef CONFIG_BINMAN
/**
* binman_symname() - Internal fnuction to get a binman symbol name
*
* @entry_name: Name of the entry to look for (e.g. 'u_boot_spl')
* @_prop_name: Property value to get from that entry (e.g. 'pos')
* @returns name of the symbol for that entry and property
*/
#define binman_symname(_entry_name, _prop_name) \
_binman_ ## _entry_name ## _prop_ ## _prop_name
/**
* binman_sym_declare() - Declare a symbol that will be used at run-time
*
* @_type: Type f the symbol (e.g. unsigned long)
* @entry_name: Name of the entry to look for (e.g. 'u_boot_spl')
* @_prop_name: Property value to get from that entry (e.g. 'pos')
*/
#define binman_sym_declare(_type, _entry_name, _prop_name) \
_type binman_symname(_entry_name, _prop_name) \
__attribute__((aligned(4), unused, section(".binman_sym")))
/**
* binman_sym_extern() - Declare a extern symbol that will be used at run-time
*
* @_type: Type f the symbol (e.g. unsigned long)
* @entry_name: Name of the entry to look for (e.g. 'u_boot_spl')
* @_prop_name: Property value to get from that entry (e.g. 'pos')
*/
#define binman_sym_extern(_type, _entry_name, _prop_name) \
extern _type binman_symname(_entry_name, _prop_name) \
__attribute__((aligned(4), unused, section(".binman_sym")))
/**
* binman_sym_declare_optional() - Declare an optional symbol
*
* If this symbol cannot be provided by binman, an error will not be generated.
* Instead the image will be assigned the value BINMAN_SYM_MISSING.
*
* @_type: Type f the symbol (e.g. unsigned long)
* @entry_name: Name of the entry to look for (e.g. 'u_boot_spl')
* @_prop_name: Property value to get from that entry (e.g. 'pos')
*/
#define binman_sym_declare_optional(_type, _entry_name, _prop_name) \
_type binman_symname(_entry_name, _prop_name) \
__attribute__((aligned(4), weak, unused, \
section(".binman_sym")))
/**
* binman_sym() - Access a previously declared symbol
*
* This is used to get the value of a symbol. E.g.:
*
* ulong address = binman_sym(ulong, u_boot_spl, pos);
*
* @_type: Type f the symbol (e.g. unsigned long)
* @entry_name: Name of the entry to look for (e.g. 'u_boot_spl')
* @_prop_name: Property value to get from that entry (e.g. 'pos')
* @returns value of that property (filled in by binman)
*/
#define binman_sym(_type, _entry_name, _prop_name) \
(*(_type *)&binman_symname(_entry_name, _prop_name))
#else /* !BINMAN */
#define binman_sym_declare(_type, _entry_name, _prop_name)
#define binman_sym_declare_optional(_type, _entry_name, _prop_name)
#define binman_sym_extern(_type, _entry_name, _prop_name)
#define binman_sym(_type, _entry_name, _prop_name) BINMAN_SYM_MISSING
#endif /* BINMAN */
#endif