linkcmds_rom

来自「RTEMS (Real-Time Executive for Multiproc」· 代码 · 共 199 行

/*  linkcmds
 *
 *  $Id: linkcmds_ROM,v 1.2 2003/01/20 20:33:17 joel Exp $
 */

OUTPUT_ARCH(m68k)
STARTUP(except_vect_332_ROM.o)
__DYNAMIC  =  0;

/*
 * ROM:
 * +--------------------+ <- low memory
 * | .text              |
 * |        etext       |
 * |        ctor list   | the ctor and dtor lists are for
 * |        dtor list   | C++ support
 * |        _endtext    |
 * | temporary .data    | .data is moved to RAM by crt0
 * |                    |
 * +--------------------+ <- high memory
 *
 *
 * RAM:
 * +--------------------+ <- low memory
 * | .data              | initialized data goes here
 * |        _sdata      |
 * |        _edata      |
 * +--------------------+
 * | .bss               |
 * |        __bss_start | start of bss, cleared by crt0
 * |        _end        | start of heap, used by sbrk()
 * +--------------------+
 * |    heap space      |
 * |        _ENDHEAP    |
 * |    stack space     | 
 * |        __stack     | top of stack
 * +--------------------+ <- high memory
 */

MEMORY
{
  rom     : ORIGIN = 0x90000, LENGTH = 0x70000
  ram     : ORIGIN = 0x03000, LENGTH = 0x7d000
}

_RamBase = DEFINED(_RamBase) ? _RamBase : 0x003000;
_RamSize = DEFINED(_RamSize) ? _RamSize : 0x7d000;
_RamEnd = _RamBase + _RamSize;

__end_of_ram = 0x080000;
_copy_data_from_rom = 1;
_HeapSize = DEFINED(_HeapSize) ? _HeapSize : 0x10000;
_StackSize = DEFINED(_StackSize) ? _StackSize : 0x2000;

/*
 * 
 */
SECTIONS
{
  .text :
  {
    . = .;
    CREATE_OBJECT_SYMBOLS
    text_start = .;
    _text_start = .;
    *(.text)
    . = ALIGN (16);


    /*
     * Initialization and finalization code.
     *
     * Various files can provide initialization and finalization
     * functions.  crtbegin.o and crtend.o are two instances. The
     * body of these functions are in .init and .fini sections. We
     * accumulate the bodies here, and prepend function prologues
     * from crti.o and function epilogues from crtn.o. crti.o must
     * be linked first; crtn.o must be linked last.  Because these
     * are wildcards, it doesn't matter if the user does not
     * actually link against crti.o and crtn.o; the linker won't
     * look for a file to match a wildcard.  The wildcard also
     * means that it doesn't matter which directory crti.o and
     * crtn.o are in. 
     */
    PROVIDE (_init = .);
    *crti.o(.init)
    *(.init)
    *crtn.o(.init)
    PROVIDE (_fini = .);
    *crti.o(.fini)
    *(.fini)
    *crtn.o(.fini)

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

    /*
     * C++ constructors/destructors
     *
     * gcc uses crtbegin.o to find the start of the constructors
     * and destructors so we make sure it is first.  Because this
     * is a wildcard, it doesn't matter if the user does not
     * actually link against crtbegin.o; the linker won't look for
     * a file to match a wildcard.  The wildcard also means that
     * it doesn't matter which directory crtbegin.o is in. The
     * constructor and destructor list are terminated in
     * crtend.o.  The same comments apply to it.
     */
    . = ALIGN (16);
    *crtbegin.o(.ctors)
    *(.ctors)
    *crtend.o(.ctors)
    *crtbegin.o(.dtors)
    *(.dtors)
    *crtend.o(.dtors)

    *(.eh_frame)
    . = ALIGN (16);

    /*
     * Read-only data
     */
    . = ALIGN (16);
    _rodata_start = . ;
    *(.rodata*)
    *(.gnu.linkonce.r*)

    etext = ALIGN(0x10);
    __CTOR_LIST__ = .;
    LONG((__CTOR_END__ - __CTOR_LIST__) / 4 - 2)
    *(.ctors)
    LONG(0)
    __CTOR_END__ = .;
    __DTOR_LIST__ = .;
    LONG((__DTOR_END__ - __DTOR_LIST__) / 4 - 2)
    *(.dtors)
    LONG(0)
    __DTOR_END__ = .;
    *(.lit)
    *(.shdata)
    _etext = .;
    _endtext = .;
  } > rom
  .gcc_exc :
  AT ( ADDR(.text) + SIZEOF( .text ) )
  {
    *(.gcc_exc)
  } > ram
  .data :
  {
    data_start = .;
    _data_start = .;
    _copy_start = .;
    _sdata = . ;
    *(.data)
    *(.gnu.linkonce.d*)
    *(.gcc_except_table)
    *(.jcr)

    CONSTRUCTORS
    edata = ALIGN(0x10);
    _edata = .;
  } > ram
  .shbss :
  {
    *(.shbss)
  } > ram
  .bss :
  {
    __bss_start = ALIGN(0x8);
    bss_start = .;
    _bss_start = .;
    _clear_start = .;
    *(.bss)
    *(COMMON)
    . = ALIGN (16);
    end = .;
    _end = ALIGN(0x8);
    __end = ALIGN(0x8);

    _WorkspaceBase = . + _StackSize;
  } > ram
  .stab . (NOLOAD) :
  {
    [ .stab ]
  }
  .stabstr . (NOLOAD) :
  {
    [ .stabstr ]
  }
}