Subversion Repositories openrisc_2011-10-31

# In microcomputer (MC) mode, the vectors are mapped into the on-chip ROM,

# otherwise in microprocessor (MP) mode the vectors are mapped to address 0

# on the external bus.  In MC mode, the on-chip ROM contains a bootloader program

# that loads the internal RAM from the serial port or external ROM.

#

# Common configurations:

# 1. MC mode, no external memory (serial boot).

# 2. MC mode, external RAM (serial boot).

# 3. MC mode, external ROM.

# 4. MC mode, external ROM, external RAM.

# 5. MP mode, external ROM.

# 6. MP mode, external ROM, external RAM.

# 7. MP mode, external RAM (dual-port with hosting CPU or external debugger).

#

# Config  TEXT     DATA/BSS

# 1.      INT_RAM  INT_RAM   (mcmode,onchip)

# 2.      EXT_RAM  EXT_RAM   (mcmode,extram)

# 3.      INT_RAM  INT_RAM   (mcmode,onchip)

# 4.      EXT_RAM  EXT_RAM   (mcmode,extram)

# 5.      EXT_ROM  INT_RAM   (mpmode,onchip,extrom)

# 6.      EXT_ROM  EXT_RAM   (mpmode,extram,extrom)

# 7.      EXT_RAM  EXT_RAM   (mpmode,extram)

#

# In MC mode, TEXT and DATA are copied into RAM by the bootloader.

#

# In MP mode with external ROM, DATA needs to be copied into RAM at boot time.

#

# If there is external RAM it is better to use that and reserve the internal RAM

# for data buffers.  However, the address of the external RAM needs to be specified.

#

# This emulation assumes config 7.

case $OUTPUT_ARCH in

  tic3x) OUTPUT_ARCHNAME="TMS320C3x" ;;

  tic4x) OUTPUT_ARCHNAME="TMS320C4x" ;;

esac

case $ONCHIP in

  yes) RAM=RAM;

       STACK_SIZE_DEFAULT=128;

       HEAP_SIZE_DEFAULT=0;

       ;;

  *)   RAM=EXT0;

       STACK_SIZE_DEFAULT=0x1000;

       HEAP_SIZE_DEFAULT=0x4000;

       ;;

esac

TEXT_MEMORY=$RAM;

DATA_MEMORY=$RAM;

MEMORY_DEF="

/* C30 memory space.  */

MEMORY

{

   EXT0  :  org = 0x0000000, len = 0x800000  /* External address bus.  */

   XBUS  :  org = 0x0800000, len = 0x002000  /* Expansion bus.         */

   IOBUS :  org = 0x0804000, len = 0x002000  /* I/O BUS.               */

   RAM0  :  org = 0x0809800, len = 0x000400  /* Internal RAM block 0.  */

   RAM1  :  org = 0x0809a00, len = 0x000400  /* Internal RAM block 1.  */

   RAM   :  org = 0x0809800, len = 0x000800  /* Internal RAM.          */

   EXT1  :  org = 0x080a000, len = 0x7f6000  /* External address bus.  */

}

"

test -z "$ENTRY" && ENTRY=_start

cat <

${RELOCATING+/* Linker script for $OUTPUT_ARCHNAME executable.  */}

${RELOCATING-/* Linker script for $OUTPUT_ARCHNAME object file (ld -r).  */}

OUTPUT_FORMAT("${OUTPUT_FORMAT}")

OUTPUT_ARCH("${OUTPUT_ARCH}")

${LIB_SEARCH_DIRS}

${RELOCATING+ENTRY (${ENTRY})}

${RELOCATING+ __HEAP_SIZE = DEFINED(__HEAP_SIZE) ? __HEAP_SIZE : ${HEAP_SIZE_DEFAULT};}

${RELOCATING+ __STACK_SIZE  = DEFINED(__STACK_SIZE)  ? __STACK_SIZE  : ${STACK_SIZE_DEFAULT};}

${RELOCATING+${MEMORY_DEF}}

/* In the small memory model the .data and .bss sections must be contiguous

   when loaded and fit within the same page.   The DP register is loaded

   with the page address.  */

SECTIONS

{

  /* Reset, interrupt, and trap vectors.  */

  .vectors ${RELOCATING+ 0} : {

    *(.vectors)

  } ${RELOCATING+ > ${TEXT_MEMORY}}

  /* Constants.  */

  .const : {

    *(.const)

  } ${RELOCATING+ > ${TEXT_MEMORY}}

  /* Program code.  */

  .text : {

    ${RELOCATING+  __text =  .;}

    ${RELOCATING+ *(.init)}

    *(.text)

    ${CONSTRUCTING+ ___CTOR_LIST__ = .;}

    ${CONSTRUCTING+ LONG(___CTOR_END__ - ___CTOR_LIST__ - 2)}

    ${CONSTRUCTING+ *(.ctors)}

    ${CONSTRUCTING+ LONG(0);}

    ${CONSTRUCTING+ ___CTOR_END__  = .;}

    ${CONSTRUCTING+ ___DTOR_LIST__ = .;}

    ${CONSTRUCTING+ LONG(___DTOR_END__ - ___DTOR_LIST__ - 2)}

    ${CONSTRUCTING+ *(.dtors)}

    ${CONSTRUCTING+ LONG(0)}

    ${CONSTRUCTING+ ___DTOR_END__  = .;}

    ${RELOCATING+ *(.fini)}

    ${RELOCATING+  __etext =  .;}

  } ${RELOCATING+ > ${TEXT_MEMORY}}

  /* Global initialised variables.  */

  .data :

  {

    ${RELOCATING+  __data  =  .;}

    *(.data)

    ${RELOCATING+  __edata  = .;}

  } ${RELOCATING+ > ${DATA_MEMORY}}

  /* Global uninitialised variables.  */

  .bss : {

    ${RELOCATING+ __bss  =  .;}

    *(.bss)

    *(COMMON)

    ${RELOCATING+  __end  =  .;}

  } ${RELOCATING+ > ${DATA_MEMORY}}

  /* Heap.  */

  .heap :

  {

    ${RELOCATING+ __heap  =  .;}

    ${RELOCATING+ . += __HEAP_SIZE};

  } ${RELOCATING+ > ${DATA_MEMORY}}

  /* Stack (grows upward).  */

  .stack :

  {

    ${RELOCATING+ __stack  =  .;}

    *(.stack)

    ${RELOCATING+ .  =  . + __STACK_SIZE};

  } ${RELOCATING+ > ${DATA_MEMORY}}

  .stab 0 ${RELOCATING+(NOLOAD)} :

  {

    [ .stab ]

  }

  .stabstr 0 ${RELOCATING+(NOLOAD)} :

  {

    [ .stabstr ]

  }

}

EOF