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 that are specific
 *  to the MBX860-2 board.
 *
 *  $Id: linkcmds,v 1.6 2003/01/20 20:20:08 joel Exp $
 */

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

/*
 * Declare some sizes.
 * XXX: The assignment of ". += XyzSize;" fails in older gld's if the
 *      number used there is not constant.  If this happens to you, edit
 *      the lines marked XXX below to use a constant value.
 */
HeapSize = DEFINED(HeapSize) ? HeapSize : 0x100000;	/* 1M Heap */
StackSize = DEFINED(StackSize) ? StackSize : 0x1000;
 
MEMORY
	{
	ram : org = 0x0, l = 4M
	nvram : org = 0xfa000000, l = 32K
	dpram : org = 0xfa200000, l = 16K
	flash : org = 0xfc000000, l = 2M
	immr  : org = 0xfa200000, l = 16K
	}


SECTIONS
{
  /*
   *  If the vectors are specified statically rather than created at run time,
   *  accumulate them starting at VMA 0x0.
   */ 
  .vectors :
  {
    *(.vectors)
  } >ram

  /* 
   *  The stack will live in this area - between the vectors and
   *  the text section.
   */
	
  .text 0x10000:
  {
    /* Read-only sections, merged into text segment: */
    
    text.start = .;

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

    /* Actual code */
    *(.text)
    *(.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 lenght
     *  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 = .);
 } > ram
 
  /* R/W Data */
  .data :
  {
    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.*)
    *(.sbss2)
    PROVIDE (__SDATA2_END__ = .);
  } > ram
	
	 
  .bss :
  {
    PROVIDE (__SBSS_START__ = .);
	
    PROVIDE (__SBSS2_START__ = .);
    *(.sbss2)
    PROVIDE (__SBSS2_END__ = .);
	
    bss.start = .;
    *(.bss) 
    *(.sbss)
    *(COMMON)
    . = ALIGN(4);
    bss.end = .;
    
   PROVIDE (__SBSS_END__ = .);

  } > ram
  
  bss.size = bss.end - bss.start;
  text.size = text.end - text.start;
  PROVIDE(_end = bss.end);
  /*
   * Interrupt stack setup
   */

  IntrStack_start = ALIGN(0x10);
  . += 0x4000;
  intrStack = .;
  PROVIDE(intrStackPtr = intrStack);

  _HeapStart = .;
  __HeapStart = .;
  . += HeapSize;  /* XXX -- Old gld can't handle this */
  /* . += 0x80000; */ /* HeapSize for old gld */
  _HeapEnd = .;
  __HeapEnd = .;
  clear_end = .;
        
  _WorkspaceBase = .;
  __WorkspaceBase = .;
	
  dpram : 
  {
  m8xx = .;
  _m8xx = .;
  . += (16 * 1024);
  } >immr

  /* 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  .  */
}