Subversion Repositories openrisc_2011-10-31

STARTUP(crt0.o)
OUTPUT_ARCH(m68k)
/* Uncomment this if you want srecords. This is needed for a.out
 * if you plan to use GDB.
OUTPUT_FORMAT(srec)
 */

SEARCH_DIR(.)
GROUP(-lidp -lc -lgcc)
__DYNAMIC  =  0;

/*
 * Setup the memory map of the MC68ec0x0 Board (IDP)
 * stack grows down from high memory. This works for
 * both the rom68k and the mon68k monitors.
 *
 * The memory map look like this:
 * +--------------------+ <- low memory
 * | .text              |
 * |        _etext      |
 * |        ctor list   | the ctor and dtor lists are for
 * |        dtor list   | C++ support
 * +--------------------+
 * | .data              | initialized data goes here
 * |        _edata      |
 * +--------------------+
 * | .bss               |
 * |        __bss_start | start of bss, cleared by crt0
 * |        _end        | start of heap, used by sbrk()
 * +--------------------+
 * .                    .
 * .                    .
 * .                    .
 * |        __stack     | top of stack
 * +--------------------+
 */

/*
 * When the IDP is not remapped (see rom68k's MP command in the
 * "M68EC0x0IDP Users Manual", the first 64K bytes are reserved;
 * Otherwise the first 256K bytes are reserved.
 *
 * The following memory map describes a unmapped IDP w/2MB RAM.
 */

MEMORY
{
  ram (rwx) : ORIGIN = 0x00010000, LENGTH = 2M-64K
  rom0      : ORIGIN = 0x00800000, LENGTH = 1M
  rom1      : ORIGIN = 0x00900000, LENGTH = 1M
}

/*
 * allocate the stack to be at the top of memory, since the stack
 * grows down
 */

PROVIDE (__stack = 2M - 8);

/*
 * Initalize some symbols to be zero so we can reference them in the
 * crt0 without core dumping. These functions are all optional, but
 * we do this so we can have our crt0 always use them if they exist. 
 * This is so BSPs work better when using the crt0 installed with gcc.
 * We have to initalize them twice, so we cover a.out (which prepends
 * an underscore) and coff object file formats.
 */
PROVIDE (hardware_init_hook = 0);
PROVIDE (_hardware_init_hook = 0);
PROVIDE (software_init_hook = 0);
PROVIDE (_software_init_hook = 0);
/*
 * stick everything in ram (of course)
 */
SECTIONS
{
  .text :
  {
    CREATE_OBJECT_SYMBOLS
    *(.text .text.*)

    . = ALIGN(0x4);
    /* These are for running static constructors and destructors under ELF.  */
    KEEP (*crtbegin.o(.ctors))
    KEEP (*(EXCLUDE_FILE (*crtend.o) .ctors))
    KEEP (*(SORT(.ctors.*)))
    KEEP (*(.ctors))
    KEEP (*crtbegin.o(.dtors))
    KEEP (*(EXCLUDE_FILE (*crtend.o) .dtors))
    KEEP (*(SORT(.dtors.*)))
    KEEP (*(.dtors))

    *(.rodata .rodata.*)

    . = ALIGN(0x4);
    *(.gcc_except_table) 

    . = ALIGN(0x4);
    *(.eh_frame)

    . = ALIGN(0x4);
    __INIT_SECTION__ = . ;
    LONG (0x4e560000)   /* linkw %fp,#0 */
    *(.init)
    SHORT (0x4e5e)      /* unlk %fp */
    SHORT (0x4e75)      /* rts */

    . = ALIGN(0x4);
    __FINI_SECTION__ = . ;
    LONG (0x4e560000)   /* linkw %fp,#0 */
    *(.fini)
    SHORT (0x4e5e)      /* unlk %fp */
    SHORT (0x4e75)      /* rts */

    _etext = .;
    *(.lit)
  } > ram

  .data :
  {
    *(.got.plt) *(.got)
    *(.shdata)
    *(.data .data.*)
    _edata = .;
  } > ram

  .bss :
  {
    . = ALIGN(0x4);
    __bss_start = . ;
    *(.shbss)
    *(.bss .bss.*)
    *(COMMON)
    _end =  ALIGN (0x8);
    __end = _end;
  } > ram

  .stab 0 (NOLOAD) :
  {
    *(.stab)
  }

  .stabstr 0 (NOLOAD) :
  {
    *(.stabstr)
  }
}