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 helas-403
 *  This file is intended to be used together with flashentry.s
 *  it will generate a ROM that can be started directly after powerup reset
 *  $Id: linkcmds,v 1.8.2.2 2003/12/16 23:17:02 joel Exp $
 */

OUTPUT_FORMAT("elf32-powerpc", "elf32-powerpc",
              "elf32-powerpc")
OUTPUT_ARCH(powerpc)
 
ENTRY(flash_entry)
 
MEMORY
  {
        RAM : ORIGIN = 0, LENGTH = 8M
        FLASH : ORIGIN = 0xFFF00000, LENGTH = 512K
  }

  /* DIRTY TRICK: repeat addresses here, so we can work with them... */
  flash.start = 0xFFF00000;
  flash.size  = 512K; 

SECTIONS
{
  .entry :
  {
     *(.entry)
  } > FLASH /* this is ROM for flash_entry */
  .text :
  {
     text.start = . ;
     *(.entry2)
     *(.text)
     *(.gnu.linkonce.t.*)
     *(.rodata*)
     *(.gnu.linkonce.r.*)
     *(.rodata1)

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

     *(.eh_frame)
     *(.descriptors)
     *(rom_ver)
     etext = ALIGN(0x10);
     _etext = .;


     __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)
     _init = .; *(.init)
     _fini = .; *(.fini)
     . = ALIGN(0x10);
     _endtext = .;
     text.end = .;
     copy.src = .;
     copy.tmptop.txt = .;
  } > FLASH /* this is ROM for flash_entry */

  text.size = text.end - text.start;

  /* R/W Data */
  /* place vectors to start at offset 0x100... */
  /* IMPORTANT: sections ".fill" and ".vectors" must be the first in RAM!!*/
  .fill 0x00010000 :
  {
    . = . + 0x0100;
  } > RAM
  
  .vectors :              AT (copy.src)
  {
    copy.dest = .;
    *(.vectors)
    . = ALIGN(0x10);
    copy.tmptop.vec = .;
  } > RAM

  .data :                 AT (copy.tmptop.vec - copy.dest + copy.src)
  {
    *(.data)
    *(.data1)
    *(.data.* .gnu.linkonce.d*)
    PROVIDE (__SDATA_START__ = .);
    *(.sdata)
    *(.gnu.linkonce.s.*)
    . = ALIGN(0x10);
    copy.tmptop.dat = .;
  } > RAM
 
  PROVIDE (__EXCEPT_START__ = .);
  .gcc_except_table   :   AT (copy.tmptop.dat - copy.dest + copy.src)
  { 
    *(.gcc_except_table) 
    . = ALIGN(0x10);
    copy.tmptop.exc = .;
  } >RAM
  PROVIDE (__EXCEPT_END__ = .);

  __GOT_START__ = .;
  .got :                  AT (copy.tmptop.exc - copy.dest + copy.src)
  {
    s.got = .;
    *(.got.plt) *(.got)
    . = ALIGN(0x10);
    copy.tmptop.got = .;
  } > RAM
  __GOT_END__ = .;

  .got1 :                 AT (copy.tmptop.got - copy.dest + copy.src)
  { 
    *(.got1) 		
    . = ALIGN(0x10);
    copy.tmptop.gt1 = .;
  } >RAM

  PROVIDE (__GOT2_START__ = .);
  PROVIDE (_GOT2_START_ = .);
  .got2		  :       AT (copy.tmptop.gt1 - copy.dest + copy.src)
  { 
    *(.got2) 	
    . = ALIGN(0x10);
    copy.tmptop.gt2 = .;
  } >RAM
  PROVIDE (__GOT2_END__ = .);
  PROVIDE (_GOT2_END_ = .);

  PROVIDE (__FIXUP_START__ = .);
  PROVIDE (_FIXUP_START_ = .);
  .fixup	  :       AT (copy.tmptop.gt2 - copy.dest + copy.src)
  { 
    *(.fixup) 	
    . = ALIGN(0x10);
    copy.tmptop.fix = .;
  } >RAM
  PROVIDE (_FIXUP_END_ = .);
  PROVIDE (__FIXUP_END__ = .);
 
  PROVIDE (__SDATA2_START__ = .);
  .sdata2   	  :       AT (copy.tmptop.fix - copy.dest + copy.src)
  { 
    *(.sdata2) 	
    . = ALIGN(0x10);
    copy.tmptop.sda = .;
  } >RAM

  copy.size = copy.tmptop.sda - copy.dest;

  .sbss2   	  : 
  { 
    *(.sbss2) 	
  } >RAM
  PROVIDE (__SBSS2_END__ = .);

  __SBSS_START__ = .;
  .bss :
  {
    bss.start = .;
    *(.bss) *(.sbss) *(COMMON)
    bss.end = ALIGN(4);
  } > RAM
  __SBSS_END__ = .;
 
  bss.size = bss.end - bss.start;

  /* reserve 16KByte for stack... */
  stack.end = bss.end + 16K;
  PROVIDE(_end = stack.end);


  /* 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  .  */
  /* 
   * place reset instruction into last word of FLASH 
   * NOTE: after reset, PPC403 starts executing from address
   * 0xFFFFFFFC
   * The reset section is placed in ROM at 0xF7FFFFFC instead, 
   * but a mirror of this address exists at 0xFFFFFFFC due to
   * the initial memory controller setup
   */
  .reset  flash.start - 4 + flash.size :
  {
    *(.reset)
  } > FLASH
}