source: rtems/c/src/lib/libbsp/i386/ts_386ex/startup/linkcmds @ 1d4048b2

/*
 *  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).
 *  Copyright assigned to U.S. Government, 1994.
 *
 *  The license and distribution terms for this file may be
 *  found in the file LICENSE in this distribution or at
 *  http://www.OARcorp.com/rtems/license.html.
 *
 *  $Id$
 * 
 * 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);

        *(.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 ;  

}