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##==============================================================================
##
## crt0-eval.S
##
## MN10300 Series Evaluation Board C startup code
##
##==============================================================================
######COPYRIGHTBEGIN####
##
## 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.
##
######COPYRIGHTEND####
##------------------------------------------------------------------------------
.file "crt0-eval.S"
##------------------------------------------------------------------------------
## Startup code
.equ DRAM_TOP,0x48100000
.text
.globl __start
__start:
# Set up stack. Leave 4K at top for use by Cygmon.
mov DRAM_TOP - 0x1000,a0
sub 8,a0
mov a0,sp
# Clear BSS
mov __bss_start,a0
mov _end,a1
cmp a0,a1
beq 8f
clr d0
1:
movbu d0,(a0)
inc a0
cmp a0,a1
bne 1b
8:
# Call constructors
.extern ___main
call ___main,[],0
# Call main
clr d0
clr d1
mov d0,(4,sp)
9:
or 0x0800,psw # Enable interrupts
.extern _main
call _main,[],0
.extern __exit
call __exit,[],0
# bra 9b # Loop if we return
##------------------------------------------------------------------------------
## end of crt0-eval.S
|
