c71ee7e163
The header binman_sym.h depends on ulong typedef but does not include types.h. This means the header must be included after including types.h or a header that includes it. We could include types.h but instead let's just switch from ulong to directly using unsigned long. This removes the need for typedef'ing it in some of the tests, so also remove those. Signed-off-by: Andrew Davis <afd@ti.com> Reviewed-by: Simon Glass <sjg@chromium.org>
134 lines
4.4 KiB
C
134 lines
4.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Symbol access for symbols set up by binman as part of the build.
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*
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* This allows C code to access the position of a particular part of the image
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* assembled by binman.
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*
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* Copyright (c) 2017 Google, Inc
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*/
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#ifndef __BINMAN_SYM_H
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#define __BINMAN_SYM_H
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/* BSYM in little endian, keep in sync with tools/binman/elf.py */
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#define BINMAN_SYM_MAGIC_VALUE (0x4d595342UL)
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#define BINMAN_SYM_MISSING (-1UL)
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#if CONFIG_IS_ENABLED(BINMAN_SYMBOLS)
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/**
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* binman_symname() - Internal function to get a binman symbol name
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*
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* @entry_name: Name of the entry to look for (e.g. 'u_boot_spl')
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* @_prop_name: Property value to get from that entry (e.g. 'pos')
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* @returns name of the symbol for that entry and property
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*/
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#define binman_symname(_entry_name, _prop_name) \
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_binman_ ## _entry_name ## _prop_ ## _prop_name
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/**
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* binman_sym_declare() - Declare a symbol that will be used at run-time
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*
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* @_type: Type f the symbol (e.g. unsigned long)
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* @entry_name: Name of the entry to look for (e.g. 'u_boot_spl')
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* @_prop_name: Property value to get from that entry (e.g. 'pos')
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*/
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#define binman_sym_declare(_type, _entry_name, _prop_name) \
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_type binman_symname(_entry_name, _prop_name) \
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__attribute__((aligned(4), unused, section(".binman_sym")))
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/**
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* binman_sym_extern() - Declare a extern symbol that will be used at run-time
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*
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* @_type: Type f the symbol (e.g. unsigned long)
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* @entry_name: Name of the entry to look for (e.g. 'u_boot_spl')
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* @_prop_name: Property value to get from that entry (e.g. 'pos')
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*/
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#define binman_sym_extern(_type, _entry_name, _prop_name) \
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extern _type binman_symname(_entry_name, _prop_name) \
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__attribute__((aligned(4), unused, section(".binman_sym")))
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/**
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* binman_sym_declare_optional() - Declare an optional symbol
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*
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* If this symbol cannot be provided by binman, an error will not be generated.
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* Instead the image will be assigned the value BINMAN_SYM_MISSING.
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*
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* @_type: Type f the symbol (e.g. unsigned long)
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* @entry_name: Name of the entry to look for (e.g. 'u_boot_spl')
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* @_prop_name: Property value to get from that entry (e.g. 'pos')
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*/
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#define binman_sym_declare_optional(_type, _entry_name, _prop_name) \
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_type binman_symname(_entry_name, _prop_name) \
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__attribute__((aligned(4), weak, unused, \
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section(".binman_sym")))
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/**
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* _binman_sym_magic - Internal magic symbol for validity checks
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*
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* When building images, binman fills in this symbol with the magic
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* value #defined above. This is used to check at runtime if the
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* symbol values were filled in and are OK to use.
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*/
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extern unsigned long _binman_sym_magic;
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/**
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* DECLARE_BINMAN_MAGIC_SYM - Declare the internal magic symbol
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*
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* This macro declares the _binman_sym_magic symbol so that it exists.
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* Declaring it here would cause errors during linking due to multiple
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* definitions of the symbol.
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*/
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#define DECLARE_BINMAN_MAGIC_SYM \
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unsigned long _binman_sym_magic \
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__attribute__((aligned(4), section(".binman_sym")))
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/**
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* BINMAN_SYMS_OK - Check if the symbol values are valid
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*
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* This macro checks if the magic symbol's value is filled properly,
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* which indicates that other symbols are OK to use as well.
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*
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* Return: 1 if binman symbol values are usable, 0 if not
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*/
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#define BINMAN_SYMS_OK \
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(*(unsigned long *)&_binman_sym_magic == BINMAN_SYM_MAGIC_VALUE)
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/**
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* binman_sym() - Access a previously declared symbol
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*
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* This is used to get the value of a symbol. E.g.:
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*
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* unsigned long address = binman_sym(unsigned long, u_boot_spl, pos);
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*
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* @_type: Type f the symbol (e.g. unsigned long)
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* @entry_name: Name of the entry to look for (e.g. 'u_boot_spl')
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* @_prop_name: Property value to get from that entry (e.g. 'pos')
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*
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* Return: value of that property (filled in by binman), or
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* BINMAN_SYM_MISSING if the value is unavailable
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*/
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#define binman_sym(_type, _entry_name, _prop_name) \
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(BINMAN_SYMS_OK ? \
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(*(_type *)&binman_symname(_entry_name, _prop_name)) : \
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BINMAN_SYM_MISSING)
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#else /* !CONFIG_IS_ENABLED(BINMAN_SYMBOLS) */
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#define binman_sym_declare(_type, _entry_name, _prop_name)
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#define binman_sym_declare_optional(_type, _entry_name, _prop_name)
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#define binman_sym_extern(_type, _entry_name, _prop_name)
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#define DECLARE_BINMAN_MAGIC_SYM
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#define BINMAN_SYMS_OK (0)
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#define binman_sym(_type, _entry_name, _prop_name) BINMAN_SYM_MISSING
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#endif /* CONFIG_IS_ENABLED(BINMAN_SYMBOLS) */
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#endif
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