boot-linkerscript.ld

/* Default linker script, for normal executables */
OUTPUT_FORMAT("elf32-tradlittlemips")
OUTPUT_ARCH(pic32mx)
ENTRY(_reset)

/*
 * Provide for a minimum stack and heap size
 * - _min_stack_size - represents the minimum space that must be made
 *                     available for the stack.  Can be overridden from
 *                     the command line using the linker's --defsym option.
 * - _min_heap_size  - represents the minimum space that must be made
 *                     available for the heap.  Can be overridden from
 *                     the command line using the linker's --defsym option.
 */
EXTERN (_min_stack_size _min_heap_size)
PROVIDE(_min_stack_size = 0x400) ;
PROVIDE(_min_heap_size = 0) ;

/*************************************************************************
 * Processor-specific object file.  Contains SFR definitions.
 *************************************************************************/
INPUT("processor.o")

/*************************************************************************
 * For interrupt vector handling
 *************************************************************************/
PROVIDE(_vector_spacing = 0x00000001);
//_ebase_address  = 0x9FC01000;
_ebase_address  = 0x0;
//_general_exception_context = 0xBFC00000;
//_on_bootstrap = 0xBFC00000;

/*************************************************************************
 * Memory Address Equates
 *************************************************************************/
_RESET_ADDR              = 0xBFC00000;
_BEV_EXCPT_ADDR          = 0xBFC00380;
_DBG_EXCPT_ADDR          = 0xBFC00480;
_DBG_CODE_ADDR           = 0xBFC02000;
_GEN_EXCPT_ADDR          = _ebase_address + 0x180;

/*************************************************************************
 * Memory Regions
 *
 * Memory regions without attributes cannot be used for orphaned sections.
 * Only sections specifically assigned to these regions can be allocated
 * into these regions.
 *************************************************************************/
MEMORY
{
  kseg0_program_mem    (rx)  : ORIGIN = 0x9D000000, LENGTH = 0x00000
  //kseg0_boot_mem       (rx)  : ORIGIN = 0x9FC00490, LENGTH = 0x970
  //exception_mem              : ORIGIN = 0x9FC01180, LENGTH = 0x90
  //kseg0_boot_memB      (rx)  : ORIGIN = 0x9FC01210, LENGTH = 0xDF0
  kseg0_boot_mem       (rx)  : ORIGIN = 0x9FC00490, LENGTH = 0x1B70
  exception_mem              : ORIGIN = 0x9FC00000, LENGTH = 0x0
  kseg1_boot_mem             : ORIGIN = 0xBFC00000, LENGTH = 0x490
  debug_exec_mem             : ORIGIN = 0xBFC02000, LENGTH = 0xFF0
  config3                    : ORIGIN = 0xBFC02FF0, LENGTH = 0x4
  config2                    : ORIGIN = 0xBFC02FF4, LENGTH = 0x4
  config1                    : ORIGIN = 0xBFC02FF8, LENGTH = 0x4
  config0                    : ORIGIN = 0xBFC02FFC, LENGTH = 0x4

  boot_software_key          : ORIGIN = 0xA0000000, LENGTH = 0x4
  kseg1_data_mem       (w!x) : ORIGIN = 0xA0000004, LENGTH = 0x7FFC
/*
  kseg1_data_mem       (w!x) : ORIGIN = 0xA0000000, LENGTH = 0x8000
*/
  sfrs                       : ORIGIN = 0xBF800000, LENGTH = 0x100000
}
SECTIONS
{

  .boot_software_key_sec : {
    *(.boot_software_key_sec)
  } > boot_software_key

  .config_BFC02FF0 : {
    KEEP(*(.config_BFC02FF0))
  } > config3
  .config_BFC02FF4 : {
    KEEP(*(.config_BFC02FF4))
  } > config2
  .config_BFC02FF8 : {
    KEEP(*(.config_BFC02FF8))
  } > config1
  .config_BFC02FFC : {
    KEEP(*(.config_BFC02FFC))
  } > config0
}


SECTIONS
{
  /* Boot Sections */
  .reset _RESET_ADDR :
  {
    KEEP(*(.reset))
  } > kseg1_boot_mem
  .dbg_excpt _DBG_EXCPT_ADDR (NOLOAD) :
  {
    . += (DEFINED (_DEBUGGER) ? 0x8 : 0x0);
  } > kseg1_boot_mem
  .dbg_code _DBG_CODE_ADDR (NOLOAD) :
  {
    . += (DEFINED (_DEBUGGER) ? 0xFF0 : 0x0);
  } > debug_exec_mem
  
  /DISCARD/ :
  {
    *(.gen_handler)
  } 
  /DISCARD/ :
  {
    *(.vector_0)
  } 

/*
  .vector_1 _ebase_address + 0x200 + (_vector_spacing << 5) * 1 :
  {
    KEEP(*(.vector_1))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_1) <= (_vector_spacing << 5), "function at exception vector 1 too large")
  .vector_2 _ebase_address + 0x200 + (_vector_spacing << 5) * 2 :
  {
    KEEP(*(.vector_2))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_2) <= (_vector_spacing << 5), "function at exception vector 2 too large")
  .vector_3 _ebase_address + 0x200 + (_vector_spacing << 5) * 3 :
  {
    KEEP(*(.vector_3))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_3) <= (_vector_spacing << 5), "function at exception vector 3 too large")
  .vector_4 _ebase_address + 0x200 + (_vector_spacing << 5) * 4 :
  {
    KEEP(*(.vector_4))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_4) <= (_vector_spacing << 5), "function at exception vector 4 too large")
  .vector_5 _ebase_address + 0x200 + (_vector_spacing << 5) * 5 :
  {
    KEEP(*(.vector_5))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_5) <= (_vector_spacing << 5), "function at exception vector 5 too large")
  .vector_6 _ebase_address + 0x200 + (_vector_spacing << 5) * 6 :
  {
    KEEP(*(.vector_6))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_6) <= (_vector_spacing << 5), "function at exception vector 6 too large")
  .vector_7 _ebase_address + 0x200 + (_vector_spacing << 5) * 7 :
  {
    KEEP(*(.vector_7))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_7) <= (_vector_spacing << 5), "function at exception vector 7 too large")
  .vector_8 _ebase_address + 0x200 + (_vector_spacing << 5) * 8 :
  {
    KEEP(*(.vector_8))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_8) <= (_vector_spacing << 5), "function at exception vector 8 too large")
  .vector_9 _ebase_address + 0x200 + (_vector_spacing << 5) * 9 :
  {
    KEEP(*(.vector_9))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_9) <= (_vector_spacing << 5), "function at exception vector 9 too large")
  .vector_10 _ebase_address + 0x200 + (_vector_spacing << 5) * 10 :
  {
    KEEP(*(.vector_10))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_10) <= (_vector_spacing << 5), "function at exception vector 10 too large")
  .vector_11 _ebase_address + 0x200 + (_vector_spacing << 5) * 11 :
  {
    KEEP(*(.vector_11))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_11) <= (_vector_spacing << 5), "function at exception vector 11 too large")
  .vector_12 _ebase_address + 0x200 + (_vector_spacing << 5) * 12 :
  {
    KEEP(*(.vector_12))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_12) <= (_vector_spacing << 5), "function at exception vector 12 too large")
  .vector_13 _ebase_address + 0x200 + (_vector_spacing << 5) * 13 :
  {
    KEEP(*(.vector_13))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_13) <= (_vector_spacing << 5), "function at exception vector 13 too large")
  .vector_14 _ebase_address + 0x200 + (_vector_spacing << 5) * 14 :
  {
    KEEP(*(.vector_14))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_14) <= (_vector_spacing << 5), "function at exception vector 14 too large")
  .vector_15 _ebase_address + 0x200 + (_vector_spacing << 5) * 15 :
  {
    KEEP(*(.vector_15))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_15) <= (_vector_spacing << 5), "function at exception vector 15 too large")
  .vector_16 _ebase_address + 0x200 + (_vector_spacing << 5) * 16 :
  {
    KEEP(*(.vector_16))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_16) <= (_vector_spacing << 5), "function at exception vector 16 too large")
  .vector_17 _ebase_address + 0x200 + (_vector_spacing << 5) * 17 :
  {
    KEEP(*(.vector_17))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_17) <= (_vector_spacing << 5), "function at exception vector 17 too large")
  .vector_18 _ebase_address + 0x200 + (_vector_spacing << 5) * 18 :
  {
    KEEP(*(.vector_18))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_18) <= (_vector_spacing << 5), "function at exception vector 18 too large")
  .vector_19 _ebase_address + 0x200 + (_vector_spacing << 5) * 19 :
  {
    KEEP(*(.vector_19))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_19) <= (_vector_spacing << 5), "function at exception vector 19 too large")
  .vector_20 _ebase_address + 0x200 + (_vector_spacing << 5) * 20 :
  {
    KEEP(*(.vector_20))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_20) <= (_vector_spacing << 5), "function at exception vector 20 too large")
  .vector_21 _ebase_address + 0x200 + (_vector_spacing << 5) * 21 :
  {
    KEEP(*(.vector_21))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_21) <= (_vector_spacing << 5), "function at exception vector 21 too large")
  .vector_22 _ebase_address + 0x200 + (_vector_spacing << 5) * 22 :
  {
    KEEP(*(.vector_22))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_22) <= (_vector_spacing << 5), "function at exception vector 22 too large")
  .vector_23 _ebase_address + 0x200 + (_vector_spacing << 5) * 23 :
  {
    KEEP(*(.vector_23))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_23) <= (_vector_spacing << 5), "function at exception vector 23 too large")
  .vector_24 _ebase_address + 0x200 + (_vector_spacing << 5) * 24 :
  {
    KEEP(*(.vector_24))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_24) <= (_vector_spacing << 5), "function at exception vector 24 too large")
  .vector_25 _ebase_address + 0x200 + (_vector_spacing << 5) * 25 :
  {
    KEEP(*(.vector_25))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_25) <= (_vector_spacing << 5), "function at exception vector 25 too large")
  .vector_26 _ebase_address + 0x200 + (_vector_spacing << 5) * 26 :
  {
    KEEP(*(.vector_26))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_26) <= (_vector_spacing << 5), "function at exception vector 26 too large")
  .vector_27 _ebase_address + 0x200 + (_vector_spacing << 5) * 27 :
  {
    KEEP(*(.vector_27))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_27) <= (_vector_spacing << 5), "function at exception vector 27 too large")
  .vector_28 _ebase_address + 0x200 + (_vector_spacing << 5) * 28 :
  {
    KEEP(*(.vector_28))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_28) <= (_vector_spacing << 5), "function at exception vector 28 too large")
  .vector_29 _ebase_address + 0x200 + (_vector_spacing << 5) * 29 :
  {
    KEEP(*(.vector_29))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_29) <= (_vector_spacing << 5), "function at exception vector 29 too large")
  .vector_30 _ebase_address + 0x200 + (_vector_spacing << 5) * 30 :
  {
    KEEP(*(.vector_30))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_30) <= (_vector_spacing << 5), "function at exception vector 30 too large")
  .vector_31 _ebase_address + 0x200 + (_vector_spacing << 5) * 31 :
  {
    KEEP(*(.vector_31))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_31) <= (_vector_spacing << 5), "function at exception vector 31 too large")
  .vector_32 _ebase_address + 0x200 + (_vector_spacing << 5) * 32 :
  {
    KEEP(*(.vector_32))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_32) <= (_vector_spacing << 5), "function at exception vector 32 too large")
  .vector_33 _ebase_address + 0x200 + (_vector_spacing << 5) * 33 :
  {
    KEEP(*(.vector_33))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_33) <= (_vector_spacing << 5), "function at exception vector 33 too large")
  .vector_34 _ebase_address + 0x200 + (_vector_spacing << 5) * 34 :
  {
    KEEP(*(.vector_34))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_34) <= (_vector_spacing << 5), "function at exception vector 34 too large")
  .vector_35 _ebase_address + 0x200 + (_vector_spacing << 5) * 35 :
  {
    KEEP(*(.vector_35))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_35) <= (_vector_spacing << 5), "function at exception vector 35 too large")
  .vector_36 _ebase_address + 0x200 + (_vector_spacing << 5) * 36 :
  {
    KEEP(*(.vector_36))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_36) <= (_vector_spacing << 5), "function at exception vector 36 too large")
  .vector_37 _ebase_address + 0x200 + (_vector_spacing << 5) * 37 :
  {
    KEEP(*(.vector_37))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_37) <= (_vector_spacing << 5), "function at exception vector 37 too large")
  .vector_38 _ebase_address + 0x200 + (_vector_spacing << 5) * 38 :
  {
    KEEP(*(.vector_38))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_38) <= (_vector_spacing << 5), "function at exception vector 38 too large")
  .vector_39 _ebase_address + 0x200 + (_vector_spacing << 5) * 39 :
  {
    KEEP(*(.vector_39))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_39) <= (_vector_spacing << 5), "function at exception vector 39 too large")
  .vector_40 _ebase_address + 0x200 + (_vector_spacing << 5) * 40 :
  {
    KEEP(*(.vector_40))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_40) <= (_vector_spacing << 5), "function at exception vector 40 too large")
  .vector_41 _ebase_address + 0x200 + (_vector_spacing << 5) * 41 :
  {
    KEEP(*(.vector_41))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_41) <= (_vector_spacing << 5), "function at exception vector 41 too large")
  .vector_42 _ebase_address + 0x200 + (_vector_spacing << 5) * 42 :
  {
    KEEP(*(.vector_42))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_42) <= (_vector_spacing << 5), "function at exception vector 42 too large")
  .vector_43 _ebase_address + 0x200 + (_vector_spacing << 5) * 43 :
  {
    KEEP(*(.vector_43))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_43) <= (_vector_spacing << 5), "function at exception vector 43 too large")
  .vector_44 _ebase_address + 0x200 + (_vector_spacing << 5) * 44 :
  {
    KEEP(*(.vector_44))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_44) <= (_vector_spacing << 5), "function at exception vector 44 too large")
  .vector_45 _ebase_address + 0x200 + (_vector_spacing << 5) * 45 :
  {
    KEEP(*(.vector_45))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_45) <= (_vector_spacing << 5), "function at exception vector 45 too large")
  .vector_46 _ebase_address + 0x200 + (_vector_spacing << 5) * 46 :
  {
    KEEP(*(.vector_46))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_46) <= (_vector_spacing << 5), "function at exception vector 46 too large")
  .vector_47 _ebase_address + 0x200 + (_vector_spacing << 5) * 47 :
  {
    KEEP(*(.vector_47))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_47) <= (_vector_spacing << 5), "function at exception vector 47 too large")
  .vector_48 _ebase_address + 0x200 + (_vector_spacing << 5) * 48 :
  {
    KEEP(*(.vector_48))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_48) <= (_vector_spacing << 5), "function at exception vector 48 too large")
  .vector_49 _ebase_address + 0x200 + (_vector_spacing << 5) * 49 :
  {
    KEEP(*(.vector_49))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_49) <= (_vector_spacing << 5), "function at exception vector 49 too large")
  .vector_50 _ebase_address + 0x200 + (_vector_spacing << 5) * 50 :
  {
    KEEP(*(.vector_50))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_50) <= (_vector_spacing << 5), "function at exception vector 50 too large")
  .vector_51 _ebase_address + 0x200 + (_vector_spacing << 5) * 51 :
  {
    KEEP(*(.vector_51))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_51) <= (_vector_spacing << 5), "function at exception vector 51 too large")
  .vector_52 _ebase_address + 0x200 + (_vector_spacing << 5) * 52 :
  {
    KEEP(*(.vector_52))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_52) <= (_vector_spacing << 5), "function at exception vector 52 too large")
  .vector_53 _ebase_address + 0x200 + (_vector_spacing << 5) * 53 :
  {
    KEEP(*(.vector_53))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_53) <= (_vector_spacing << 5), "function at exception vector 53 too large")
  .vector_54 _ebase_address + 0x200 + (_vector_spacing << 5) * 54 :
  {
    KEEP(*(.vector_54))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_54) <= (_vector_spacing << 5), "function at exception vector 54 too large")
  .vector_55 _ebase_address + 0x200 + (_vector_spacing << 5) * 55 :
  {
    KEEP(*(.vector_55))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_55) <= (_vector_spacing << 5), "function at exception vector 55 too large")
  .vector_56 _ebase_address + 0x200 + (_vector_spacing << 5) * 56 :
  {
    KEEP(*(.vector_56))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_56) <= (_vector_spacing << 5), "function at exception vector 56 too large")
  .vector_57 _ebase_address + 0x200 + (_vector_spacing << 5) * 57 :
  {
    KEEP(*(.vector_57))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_57) <= (_vector_spacing << 5), "function at exception vector 57 too large")
  .vector_58 _ebase_address + 0x200 + (_vector_spacing << 5) * 58 :
  {
    KEEP(*(.vector_58))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_58) <= (_vector_spacing << 5), "function at exception vector 58 too large")
  .vector_59 _ebase_address + 0x200 + (_vector_spacing << 5) * 59 :
  {
    KEEP(*(.vector_59))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_59) <= (_vector_spacing << 5), "function at exception vector 59 too large")
  .vector_60 _ebase_address + 0x200 + (_vector_spacing << 5) * 60 :
  {
    KEEP(*(.vector_60))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_60) <= (_vector_spacing << 5), "function at exception vector 60 too large")
  .vector_61 _ebase_address + 0x200 + (_vector_spacing << 5) * 61 :
  {
    KEEP(*(.vector_61))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_61) <= (_vector_spacing << 5), "function at exception vector 61 too large")
  .vector_62 _ebase_address + 0x200 + (_vector_spacing << 5) * 62 :
  {
    KEEP(*(.vector_62))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_62) <= (_vector_spacing << 5), "function at exception vector 62 too large")
  .vector_63 _ebase_address + 0x200 + (_vector_spacing << 5) * 63 :
  {
    KEEP(*(.vector_63))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_63) <= (_vector_spacing << 5), "function at exception vector 63 too large")
*/
  .startup ORIGIN(kseg0_boot_mem) :
  {
    KEEP(*(.startup))
  } > kseg0_boot_mem
  /* Code Sections */
  .text  :
  {
    _text_begin = . ;
    *(.text .stub .text.* .gnu.linkonce.t.*)
    KEEP (*(.text.*personality*))
    /* .gnu.warning sections are handled specially by elf32.em.  */
    *(.gnu.warning)
    *(.mips16.fn.*)
    *(.mips16.call.*)
    _text_end = . ;
  } >kseg0_boot_mem
  /* Read-only sections */
  .rodata   :
  {
    *(.rodata .rodata.* .gnu.linkonce.r.*)
    *(.rodata1)
    . = ALIGN(4) ;
  } >kseg0_boot_mem
  
  /*
   * Small initialized constant global and static data can be placed in the
   * .sdata2 section.  This is different from .sdata, which contains small
   * initialized non-constant global and static data.
   */
  .sdata2 ALIGN(4)   :
  {
    *(.sdata2 .sdata2.* .gnu.linkonce.s2.*)
    . = ALIGN(4) ;
  } >kseg0_boot_mem
  /*
   * Uninitialized constant global and static data (i.e., variables which will
   * always be zero).  Again, this is different from .sbss, which contains
   * small non-initialized, non-constant global and static data.
   */
  .sbss2 ALIGN(4)   :
  {
    *(.sbss2 .sbss2.* .gnu.linkonce.sb2.*)
    . = ALIGN(4) ;
  } >kseg0_boot_mem
  .eh_frame_hdr : { *(.eh_frame_hdr) }
  .eh_frame       : ONLY_IF_RO { KEEP (*(.eh_frame)) }
  .dbg_data (NOLOAD) :
  {
    . += (DEFINED (_DEBUGGER) ? 0x200 : 0x0);
  } >kseg1_data_mem
  .data   :
  {
    _data_begin = . ;
    *(.data .data.* .gnu.linkonce.d.*)
    KEEP (*(.gnu.linkonce.d.*personality*))
    *(.data1)
  } >kseg1_data_mem AT>kseg0_boot_mem
  _data_image_begin = LOADADDR(.data) ;
  .eh_frame       : ONLY_IF_RW { KEEP (*(.eh_frame)) }
  . = .;
  _gp = ALIGN(16) + 0x7ff0;
  .got ALIGN(4)   :
  {
     *(.got.plt) *(.got)
  } >kseg1_data_mem AT>kseg0_boot_mem
  /*
   * We want the small data sections together, so single-instruction offsets
   * can access them all, and initialized data all before uninitialized, so
   * we can shorten the on-disk segment size.
   */
  .sdata ALIGN(4)   :
  {
    _sdata_begin = . ;
    *(.sdata .sdata.* .gnu.linkonce.s.*)
    _sdata_end = . ;
  } >kseg1_data_mem AT>kseg0_boot_mem
  .lit8           :
  {
    *(.lit8)
  } >kseg1_data_mem AT>kseg0_boot_mem
  .lit4           :
  {
    *(.lit4)
  } >kseg1_data_mem AT>kseg0_boot_mem
  . = ALIGN (4) ;
  _data_end = . ;
  _bss_begin = . ;
  .sbss ALIGN(4)   :
  {
    _sbss_begin = . ;
    *(.dynsbss)
    *(.sbss .sbss.* .gnu.linkonce.sb.*)
    *(.scommon)
    _sbss_end = . ;
  } >kseg1_data_mem
  .bss   :
  {
    *(.dynbss)
    *(.bss .bss.* .gnu.linkonce.b.*)
    *(COMMON)
    /*
     * Align here to ensure that the .bss section occupies space up to
     * _end.  Align after .bss to ensure correct alignment even if the
     * .bss section disappears because there are no input sections.
     */
    . = ALIGN(4) ;
  } >kseg1_data_mem
  . = ALIGN(4) ;
  _end = . ;
  _bss_end = . ;
  /* Heap allocating takes a chunk of memory following BSS */
  .heap ALIGN(8) :
  {
    _heap = . ;
    . += _min_heap_size ;
    . = ALIGN(8);
  } >kseg1_data_mem
  /* Stack allocation follows the heap */
  .stack ALIGN(8) :
  {
    _splim = . ;
    _SPLIM = . ;
    . += _min_stack_size ;
    . = ALIGN(8);
  } >kseg1_data_mem
  /*
   * RAM functions go at the end of our stack and heap allocation.
   * Alignment of 2K required by the boundary register (BMXDKPBA).
   */
  .ramfunc ALIGN(2K) :
  {
    _ramfunc_begin = . ;
    *(.ramfunc  .ramfunc.*)
    . = ALIGN(4) ;
    _ramfunc_end = . ;
  } >kseg1_data_mem AT>kseg0_boot_mem
  _ramfunc_image_begin = LOADADDR(.ramfunc) ;
  _ramfunc_length = SIZEOF(.ramfunc) ;
  _bmxdkpba_address = _ramfunc_begin - ORIGIN(kseg1_data_mem) ;
  _bmxdudba_address = LENGTH(kseg1_data_mem) ;
  _bmxdupba_address = LENGTH(kseg1_data_mem) ;
  /*
   * The actual top of stack should include the gap between the stack
   * section and the beginning of the .ramfunc section caused by the
   * alignment of the .ramfunc section minus 2 words.  If RAM functions
   * do not exist, then the top of the stack should point to the end of
   * the data memory.
   */
  _stack = (_ramfunc_length > 0)
         ? _ramfunc_begin - 8
         : ORIGIN(kseg1_data_mem) + LENGTH(kseg1_data_mem) ;
  ASSERT((_min_stack_size + _min_heap_size) <= (_stack - _heap),
    "Not enough space to allocate both stack and heap.  Reduce heap and/or stack size.")
    /* The .pdr section belongs in the absolute section */
    /DISCARD/ : { *(.pdr) }
    /* We don't load .reginfo onto the target, so don't locate it
     * in real memory
     */
    /DISCARD/ : { *(.reginfo) }
  /* 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 .gnu.linkonce.wi.*) }
  .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) }
  /DISCARD/ : { *(.rel.dyn) }
  /DISCARD/ : { *(.note.GNU-stack) }
}