source: rtems/c/src/lib/libbsp/powerpc/ss555/startup/linkcmds @ bd86290d

/*
 * Linker command file for Intec SS555 board
 *
 * When debugging, we assume that the internal flash ROM will be replaced by
 * the external RAM on the SS555 board.  All sections are stacked starting
 * at address zero.  Nothing is placed in the internal RAM, since it's not
 * contiguous with the external SRAM when the external RAM is placed at
 * zero.
 *
 * For final production, we assume that the .text section will be burned
 * into flash ROM starting at address zero.  The .data, .bss, heap, and
 * workspace will reside in RAM, starting at the beginning of the internal
 * RAM.  The system startup code will configure the external RAM to begin
 * where the internal RAM ends, so as to make one large RAM block.
 *
 * Debugging mode is chosen when the RTEMS_DEBUG symbol is defined.  The
 * RTEMS_DEBUG symbol is defined in the bsp_specs file whenever make(1) is
 * invoked with VARIANT=DEBUG.
 *
 *  $Id$
 */

OUTPUT_FORMAT("elf32-powerpc", "elf32-powerpc", "elf32-powerpc")
OUTPUT_ARCH(powerpc) 
ENTRY(start)

int_ram_org     = 0x003F9800;           /* base of internal RAM */
int_ram_top     = 0x00400000;           /* top of internal RAM */
ext_ram_size    = 0x00080000;           /* size of external RAM */


SECTIONS
{
  .vectors 0x0:
  {
    /*
     * For the MPC555, we use the compressed vector table format which puts
     * all of the exception vectors before 0x100.
     */ 
    *(.vectors)
  }

  .text 0x100:
  {
    /* Read-only sections, merged into text segment: */
    
    text.start = .;

    /* Entry point is the .entry section */
    *(.entry)
    *(.entry2)

    /* Actual code */
    *(.text*)

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

    /* 
     *  C++ constructors and destructors for static objects.
     *  PowerPC EABI does not use crtstuff yet, so we build "old-style"
     *  constructor and destructor lists that begin with the list length
     *  end terminate with a NULL entry.
     */
    PROVIDE (__CTOR_LIST__ = .);             
    /* LONG((__CTOR_END__ - __CTOR_LIST__) / 4 - 2) */
    *crtbegin.o(.ctors)
    *(.ctors)
    *crtend.o(.ctors)
    LONG(0)
    PROVIDE (__CTOR_END__ = .);
        
    PROVIDE (__DTOR_LIST__ = .);
    /* LONG((__DTOR_END__ - __DTOR_LIST__) / 4 - 2) */
    *crtbegin.o(.dtors)
    *(.dtors)
    *crtend.o(.dtors)
    LONG(0)
    PROVIDE (__DTOR_END__ = .);
        
    /*
     * Special FreeBSD sysctl sections.
     */
    . = ALIGN (16);
    __start_set_sysctl_set = .;
    *(set_sysctl_*);
    __stop_set_sysctl_set = ABSOLUTE(.);
    *(set_domain_*);
    *(set_pseudo_*);

    /* Exception frame info */
    *(.eh_frame)

    /* Miscellaneous read-only data */
    _rodata_start = . ;
    *(.gnu.linkonce.r*)
    *(.lit)
    *(.shdata)
    *(.rodata*)
    *(.rodata1)
    *.(eh_frame)
    *(.descriptors)
    *(rom_ver)
    _erodata = .;

    /* Various possible names for the end of the .text section */
    etext = ALIGN(0x10);
    _etext = .;
    _endtext = .;
    text.end = .;
    PROVIDE (etext = .);
    PROVIDE (__etext = .);

    /* 
     * .data section contents, copied to RAM at system startup. 
     */
    . = ALIGN(0x20);
    data.contents.start = .;
  }
  text.size = text.end - text.start;

  /*
   * If debugging, stack the read/write sections directly after the text
   * section.  Otherwise, stack the read/write sections starting at base of
   * internal RAM.
   */
  . = DEFINED(RTEMS_DEBUG) ? . : int_ram_org;
 
  .data : AT (data.contents.start)
  {
    data.start = .;
    
    *(.data)
    *(.data.*)
    *(.data1)
    
    PROVIDE (__SDATA_START__ = .);
    *(.sdata*)
    *(.gnu.linkonce.d*)
    *(.gnu.linkonce.s.*)
    PROVIDE (__SDATA_END__ = .);
    
    PROVIDE (__EXCEPT_START__ = .);
    *(.gcc_except_table)
    PROVIDE (__EXCEPT_END__ = .);
    
    PROVIDE(__GOT_START__ = .);
    *(.got.plt) 
    *(.got)
    PROVIDE(__GOT_END__ = .);
        
    *(.got1)
    
    PROVIDE (__GOT2_START__ = .);
    PROVIDE (_GOT2_START_ = .);
    *(.got2)
    PROVIDE (__GOT2_END__ = .);
    PROVIDE (_GOT2_END_ = .);
        
    PROVIDE (__FIXUP_START__ = .);
    PROVIDE (_FIXUP_START_ = .);
    *(.fixup)
    PROVIDE (_FIXUP_END_ = .);
    PROVIDE (__FIXUP_END__ = .);

    /*  We want the small data sections together, so single-instruction
     *   offsets can access them all.
     */
    PROVIDE (__SDATA2_START__ = .);
    *(.sdata2)
    *(.gnu.linkonce.s2.*)
    PROVIDE (__SDATA2_END__ = .);

    data.end = .;
  }
  data.size = data.end - data.start;
        
  .bss :
  {
    bss.start = .;
        
    PROVIDE (__SBSS2_START__ = .);
    *(.sbss2)
    PROVIDE (__SBSS2_END__ = .);
        
    PROVIDE (__SBSS_START__ = .);
    *(.sbss*)
    PROVIDE (__SBSS_END__ = .);

    *(.bss .bss* .gnu.linkonce.b*)
    *(COMMON)

    . = ALIGN(4);
    bss.end = .;
  }
  bss.size = bss.end - bss.start;

  PROVIDE(_end = bss.end);

  /*
   * Initialization stack
   */
  InitStack_start = ALIGN(0x10);
  . += 0x1000;
  initStack = .;
  PROVIDE(initStackPtr = initStack);

  /*
   * Interrupt stack
   */
  IntrStack_start = ALIGN(0x10);
  . += 0x4000;
  intrStack = .;
  PROVIDE(intrStackPtr = intrStack);

  _WorkspaceBase = .;
  __WorkspaceBase = .;
        
  /*
   * Heap
   *
   * The heap is configured at run-time to use all available memory.  It
   * begins just after the end of the Workspace and continues to the end of
   * the external RAM.
   */
  . = DEFINED(RTEMS_DEBUG) ? 0 + ext_ram_size : int_ram_top + ext_ram_size;
  _HeapEnd = .;
  __HeapEnd = .;
 
        
  /* 
   * Internal I/O devices 
   */
  .usiu 0x002FC000:             /* unified system interface unit */
  {
    usiu = .;
  }

  .imb 0x00300000:              /* inter-module bus and devices */
  {
    imb = .;
  }

  .sram 0x00380000:             /* internal SRAM control registers */
  {
    sram = .;
  }

  /*
   * SS555 external devices managed by on-board CPLD
   */
  .cpld 0xFF000000:             /* SS555 external CPLD devices */
  {
    cpld = .;
  }


  /* 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  .  */
}