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##==============================================================================
##
##      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
#ifdef __mn10300__
        .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
#else
        .section .text
        .global _start
_start:
        mov _stack-4,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
#endif