rtl-sym.c File Reference

RTEMS Run-Time Linker Object File Symbol Table. More...

#include <errno.h>
#include <inttypes.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <rtems/rtl/rtl.h>
#include "rtl-error.h"
#include <rtems/rtl/rtl-sym.h>
#include <rtems/rtl/rtl-trace.h>

Functions
bool	rtems_rtl_symbol_table_open (rtems_rtl_symbols *symbols, size_t buckets)
void	rtems_rtl_symbol_table_close (rtems_rtl_symbols *symbols)
bool	rtems_rtl_symbol_global_add (rtems_rtl_obj *obj, const unsigned char *esyms, unsigned int size, rtems_rtl_tls_offset *tls_offsets, unsigned int tls_size)
rtems_rtl_obj_sym *	rtems_rtl_symbol_global_find (const char *name)
void	rtems_rtl_symbol_obj_sort (rtems_rtl_obj *obj)
rtems_rtl_obj_sym *	rtems_rtl_symbol_obj_find (rtems_rtl_obj *obj, const char *name)
void	rtems_rtl_symbol_obj_add (rtems_rtl_obj *obj)
void	rtems_rtl_symbol_obj_erase_local (rtems_rtl_obj *obj)
void	rtems_rtl_symbol_obj_erase (rtems_rtl_obj *obj)

Detailed Description

RTEMS Run-Time Linker Object File Symbol Table.

Function Documentation

rtems_rtl_symbol_global_add()

bool rtems_rtl_symbol_global_add	(	rtems_rtl_obj *	obj,
		const unsigned char *	esyms,
		unsigned int	size,
		rtems_rtl_tls_offset *	tls_offsets,
		unsigned int	tls_size
	)

Add a table of exported symbols to the symbol table.

The export table is a series of symbol records and each record has two fields:

1. label
2. address

The 'label' is an ASCIIZ string of variable length. The address is of size of an unsigned long for the target running the link editor. The byte order is defined by the machine type because the table should be built by the target compiler.

The table is terminated with a nul string followed by the bytes 0xDE, 0xAD, 0xBE, and 0xEF. This avoids alignments issues.

Parameters

obj	The object table the symbols are for.
esyms	The exported symbol table.
size	The size of the table in bytes.
tls_offsets	The TLS offsets table. If NULL none provided.
tls_size	The number TLS offset entries in the table.

rtems_rtl_symbol_global_find()

rtems_rtl_obj_sym * rtems_rtl_symbol_global_find

(

const char *

name

)

Find a symbol given the symbol label in the global symbol table.

Parameters

name	The name as an ASCIIZ string.

Return values

NULL	No symbol found.

Returns

rtems_rtl_obj_sym* Reference to the symbol.

rtems_rtl_symbol_obj_add()

void rtems_rtl_symbol_obj_add

(

rtems_rtl_obj *

obj

)

Add the object file's symbols to the global table.

Parameters

obj	The object file the symbols are to be added.

rtems_rtl_symbol_obj_erase()

void rtems_rtl_symbol_obj_erase

(

rtems_rtl_obj *

obj

)

Erase the object file's symbols.

Parameters

obj	The object file the symbols are to be erased from.

rtems_rtl_symbol_obj_erase_local()

void rtems_rtl_symbol_obj_erase_local

(

rtems_rtl_obj *

obj

)

Erase the object file's local symbols.

Parameters

obj	The object file the local symbols are to be erased from.

rtems_rtl_symbol_obj_find()

rtems_rtl_obj_sym * rtems_rtl_symbol_obj_find	(	rtems_rtl_obj *	obj,
		const char *	name
	)

Find a symbol given the symbol label in the local object file.

Parameters

obj	The object file to search.
name	The name as an ASCIIZ string.

Return values

NULL	No symbol found.

Returns

rtems_rtl_obj_sym* Reference to the symbol.

rtems_rtl_symbol_obj_sort()

void rtems_rtl_symbol_obj_sort

(

rtems_rtl_obj *

obj

)

Sort an object file's local and global symbol table. This needs to be done before calling rtems_rtl_symbol_obj_find as it performs a binary search on the tables.

Parameters

obj	The object file to sort.

rtems_rtl_symbol_table_close()

void rtems_rtl_symbol_table_close

(

rtems_rtl_symbols *

symbols

)

Close the table and erase the hash table.

Parameters

symbols

Close the symbol table.

rtems_rtl_symbol_table_open()

bool rtems_rtl_symbol_table_open	(	rtems_rtl_symbols *	symbols,
		size_t	buckets
	)

Open a symbol table with the specified number of buckets.

Parameters

symbols	The symbol table to open.
buckets	The number of buckets in the hash table.

Return values

true	The symbol is open.
false	The symbol table could not created. The RTL error has the error.