linkcmds

RTEMS (Real-Time Executive for Multiprocessor Systems) is a free open source real-time operating sys

/*
 *  This file contains directives for the GNU linker which are specific
 *  to the Technologic Systems TS-1325 (i386ex) board.
 *
 *  Copyright (c) 1989-1998.
 *  On-Line Applications Research Corporation (OAR).
 *
 *  The license and distribution terms for this file may be
 *  found in the file LICENSE in this distribution or at
 *  http://www.rtems.com/license/LICENSE.
 *
 *  $Id: linkcmds,v 1.6.2.1 2003/09/04 18:44:09 joel Exp $
 * 
 * Memory layout:
 *
 * 0x0008000 ->    ...    : initial section ( init 386ex, goto protected mode) 
 *    ...    ->    ...    : text section ( executable code )
 *    ...    -> 0x00A0000 : data section ( initialized storage )
 * 0x0100000 -> 0x0200000 : bss section, stack space, heap storage
 */

	ENTRY(_init_i386ex) ;

SECTIONS
{

/***************************************************************************
 * initial section:
 *
 * This subsection of ".text" is the first in memory, and executed by the DOS
 * loader. It initializes the i386ex, sets up the gdt in RAM, loads the gdt,
 * jumps to protected mode, loads the idt, zeros the bss section, sets up
 * the stack and calls the rest of the RTEMS initialization.
 ***************************************************************************/

	_DOS_ld_addr	=	0x0008000 ;

/***************************************************************************
 * text section:
 *
 * Nobody here but us opcodes.
 ***************************************************************************/

        .text _DOS_ld_addr :
        {
	CREATE_OBJECT_SYMBOLS
	text_start = . ;
        _text_start = . ;

	*(.initial);
	. = ALIGN(0x20);

        *(.text );
	. = ALIGN (0x20);

	/*
	 * Special FreeBSD sysctl sections.
	 */
	. = ALIGN (16);
	__start_set_sysctl_set = .;
	*(set_sysctl_*);
	__stop_set_sysctl_set = ABSOLUTE(.);
	*(set_domain_*);
	*(set_pseudo_*);

	*(.eh_frame)
	. = ALIGN (0x20);

	*(.gnu.linkonce.t*)
	. = ALIGN(0x20);

	/*
	 * C++ constructors
	 */

	__CTOR_LIST__ = .;
	LONG((__CTOR_END__ - __CTOR_LIST__) / 4 - 2)
	*(.ctors)
	LONG(0)
	__CTOR_END__ = .;
	. = ALIGN (4) ;
	__DTOR_LIST__ = .;
	LONG((__DTOR_END__ - __DTOR_LIST__) / 4 - 2)
	*(.dtors)
	LONG(0)
	__DTOR_END__ = .;

	_rodata_start = . ;
	*(.rodata*)
	. = ALIGN(0x20);
	_erodata = .;

	*(.gnu.linkonce.r*)
        . = ALIGN(0x20);
	_endtext = . ; 
        }

/***************************************************************************
 * ctor/dtor sections:
 *
 * These sections house the  global constructors and destructors.  
 ***************************************************************************/

	.init BLOCK(0x20) :
	{
	*(.init)
	} = 0x9090

	.fini BLOCK(0x20) :
	{
	*(.fini)
	} = 0x9090

/***************************************************************************
 * data section:
 *
 * This section defines the location of the data section in RAM.  
 ***************************************************************************/

        .data  BLOCK(0x20) : 
        {
        _sdata = .;
        *(.data);
	. = ALIGN(0x20);
	*(.gnu.linkonce.d*)
	. = ALIGN(0x20);
	*(.gcc_except_table)
	. = ALIGN(0x20);
        _edata = .;
   	}
        _data_size        = _edata - _sdata ;

/***************************************************************************
 * bss section:
 *
 * The bss section is the first section in extended RAM ( > 1MB).  
 ***************************************************************************/

	.bss 0x100000 (NOLOAD) :
	{
	_bss_start = .;
	*(.bss);
	*(COMMON);
	_ebss = ALIGN(0x20);
	}
        _bss_size   = _ebss - _bss_start ;

/***************************************************************************
 * discard section:
 *
 * This section is used to throw away stuff we don't want.  
 ***************************************************************************/

	/DISCARD/ :
	{
	*(.comment);
	*(.note);
	}

/***************************************************************************
 * General variables:
 *
 * The stack_size variable is customizable here.  The heap is located directly
 * after the stack in RAM.  A routine within bspstart.c uses these variables
 * to ensure that the heap used by RTEMS is as large as the RAM remaining
 * after all workspace configurations are complete.
 ***************************************************************************/

        stack_size  = 0x8000 ;
	stack_origin = _ebss + stack_size ;
	heap_bottom  = stack_origin + 4 ;  



  /* Stabs debugging sections.  */
  .stab 0 : { *(.stab) }
  .stabstr 0 : { *(.stabstr) }
  .stab.excl 0 : { *(.stab.excl) }
  .stab.exclstr 0 : { *(.stab.exclstr) }
  .stab.index 0 : { *(.stab.index) }
  .stab.indexstr 0 : { *(.stab.indexstr) }
  .comment 0 : { *(.comment) }

  /* DWARF debug sections.
     Symbols in the DWARF debugging sections are relative to the beginning
     of the section so we begin them at 0.  */
  /* DWARF 1 */
  .debug          0 : { *(.debug) }
  .line           0 : { *(.line) }
  
  /* GNU DWARF 1 extensions */
  .debug_srcinfo  0 : { *(.debug_srcinfo) }
  .debug_sfnames  0 : { *(.debug_sfnames) }
  
  /* DWARF 1.1 and DWARF 2 */
  .debug_aranges  0 : { *(.debug_aranges) }
  .debug_pubnames 0 : { *(.debug_pubnames) }
  
  /* DWARF 2 */
  .debug_info     0 : { *(.debug_info) }
  .debug_abbrev   0 : { *(.debug_abbrev) }
  .debug_line     0 : { *(.debug_line) }
  .debug_frame    0 : { *(.debug_frame) }
  .debug_str      0 : { *(.debug_str) }
  .debug_loc      0 : { *(.debug_loc) }
  .debug_macinfo  0 : { *(.debug_macinfo) }
  
  /* SGI/MIPS DWARF 2 extensions */
  .debug_weaknames 0 : { *(.debug_weaknames) }
  .debug_funcnames 0 : { *(.debug_funcnames) }
  .debug_typenames 0 : { *(.debug_typenames) }
  .debug_varnames  0 : { *(.debug_varnames) }
  /* These must appear regardless of  .  */
}