Subversion Repositories openrisc_2011-10-31

##==============================================================================

##

##      crt0.S

##

##      MN10300 startup code

##

##==============================================================================

##

## Copyright (c) 1995, 1996, 1997, 1998 Cygnus Solutions

##

## The authors hereby grant permission to use, copy, modify, distribute,

## and license this software and its documentation for any purpose, provided

## that existing copyright notices are retained in all copies and that this

## notice is included verbatim in any distributions. No written agreement,

## license, or royalty fee is required for any of the authorized uses.

## Modifications to this software may be copyrighted by their authors

## and need not follow the licensing terms described here, provided that

## the new terms are clearly indicated on the first page of each file where

## they apply.

##

##------------------------------------------------------------------------------

        .file   "crt0.S"

##------------------------------------------------------------------------------

## Startup code

        .section .text

        .global _start

_start:

        mov _stack-8,a0         # Load up the stack pointer

        mov a0,sp

        mov _edata,a0           # Get the start/end of bss

        mov _end,a1

        cmp a0,a1               # If no bss, then do nothing

        beq .L0

        clr d0                  # clear d0

.L1:

        movbu d0,(a0)           # Clear a byte and bump pointer

        inc a0

        cmp a0,a1

        bne .L1

.L0:

        call ___main,[],0       # Call __main to run ctors/dtors

        clr d0

        clr d1

        mov d0,(4,sp)

        call _main,[],0         # Call main program

        call _exit,[],0         # All done, no need to return or

                                # deallocate our stack.

        .section .stack

_stack: .long   1

        .section .data

        .global ___dso_handle

        .weak ___dso_handle

___dso_handle:

        .long   0