Subversion Repositories openrisc_2011-10-31

##==============================================================================
##
##      crt0.S
##
##      MN10200 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,a3           # Load up the stack pointer and allocate
                                # our current frame.

        mov _edata,a0           # Get the start/end of bss
        mov _end,a1

        cmp a0,a1               # If no bss, then do nothing
        beqx .L0

        sub d0,d0               # clear d0

.L1:
        movb d0,(a0)            # Clear a byte and bump pointer
        add 1,a0
        cmp a0,a1
        bnex .L1

.L0:
        jsr ___main
        sub d0,d0
        mov d0,d1
        mov d0,(a3)
        jsr _main               # Call main program
        jmp _exit               # All done, no need to return or
                                # deallocate our stack.

        .section .stack
_stack: .long   1