forked from Imagelibrary/rtems
a2e1e30d98
Adding a local symbol lets the relocator find local symbols referenced in relocation records. The local symbol table is erased once the object module has been loaded.
136 lines
3.7 KiB
C
136 lines
3.7 KiB
C
/*
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* COPYRIGHT (c) 2012-2014 Chris Johns <chrisj@rtems.org>
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.com/license/LICENSE.
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*/
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/**
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* @file
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*
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* @ingroup rtems_rtl
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*
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* @brief RTEMS Run-Time Linker Object File Symbol Table.
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*/
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#if !defined (_RTEMS_RTL_SYM_H_)
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#define _RTEMS_RTL_SYM_H_
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#include <rtems.h>
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#include "rtl-obj-fwd.h"
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#ifdef __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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/**
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* An object file symbol.
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*/
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typedef struct rtems_rtl_obj_sym_s
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{
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rtems_chain_node node; /**< The node's link in the chain. */
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const char* name; /**< The symbol's name. */
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void* value; /**< The value of the symbol. */
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uint32_t data; /**< Format specific data. */
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} rtems_rtl_obj_sym_t;
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/**
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* Table of symbols stored in a hash table.
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*/
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typedef struct rtems_rtl_symbols_s
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{
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rtems_chain_control* buckets;
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size_t nbuckets;
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} rtems_rtl_symbols_t;
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/**
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* Open a symbol table with the specified number of buckets.
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*
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* @param symbols The symbol table to open.
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* @param buckets The number of buckets in the hash table.
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* @retval true The symbol is open.
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* @retval false The symbol table could not created. The RTL
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* error has the error.
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*/
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bool rtems_rtl_symbol_table_open (rtems_rtl_symbols_t* symbols,
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size_t buckets);
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/**
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* Close the table and erase the hash table.
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*
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* @param symbols Close the symbol table.
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*/
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void rtems_rtl_symbol_table_close (rtems_rtl_symbols_t* symbols);
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/**
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* Add a table of exported symbols to the symbol table.
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*
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* The export table is a series of symbol records and each record has two
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* fields:
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*
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* 1. label
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* 2. address
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*
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* The 'label' is an ASCIIZ string of variable length. The address is of size
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* of an unsigned long for the target running the link editor. The byte order
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* is defined by the machine type because the table should be built by the
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* target compiler.
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*
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* The table is terminated with a nul string followed by the bytes 0xDE, 0xAD,
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* 0xBE, and 0xEF. This avoids alignments issues.
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*
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* @param obj The object table the symbols are for.
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* @param esyms The exported symbol table.
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* @param size The size of the table in bytes.
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*/
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bool rtems_rtl_symbol_global_add (rtems_rtl_obj_t* obj,
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const unsigned char* esyms,
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unsigned int size);
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/**
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* Find a symbol given the symbol label in the global symbol table.
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*
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* @param name The name as an ASCIIZ string.
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* @retval NULL No symbol found.
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* @return rtems_rtl_obj_sym_t* Reference to the symbol.
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*/
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rtems_rtl_obj_sym_t* rtems_rtl_symbol_global_find (const char* name);
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/**
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* Find a symbol given the symbol label in the local object file.
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*
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* @param obj The object file to search.
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* @param name The name as an ASCIIZ string.
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* @retval NULL No symbol found.
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* @return rtems_rtl_obj_sym_t* Reference to the symbol.
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*/
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rtems_rtl_obj_sym_t* rtems_rtl_symbol_obj_find (rtems_rtl_obj_t* obj,
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const char* name);
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/**
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* Add the object file's symbols to the global table.
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*
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* @param obj The object file the symbols are to be added.
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*/
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void rtems_rtl_symbol_obj_add (rtems_rtl_obj_t* obj);
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/**
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* Erase the object file's local symbols.
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*
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* @param obj The object file the local symbols are to be erased from.
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*/
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void rtems_rtl_symbol_obj_erase_local (rtems_rtl_obj_t* obj);
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/**
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* Erase the object file's symbols.
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*
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* @param obj The object file the symbols are to be erased from.
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*/
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void rtems_rtl_symbol_obj_erase (rtems_rtl_obj_t* obj);
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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#endif
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