##==============================================================================
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##==============================================================================
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##
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##
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## crt0-eval.S
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## crt0-eval.S
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##
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##
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## MN10300 Series Evaluation Board C startup code
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## MN10300 Series Evaluation Board C startup code
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##
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##
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##==============================================================================
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##==============================================================================
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######COPYRIGHTBEGIN####
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######COPYRIGHTBEGIN####
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##
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##
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## Copyright (c) 1995, 1996, 1997, 1998 Cygnus Solutions
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## Copyright (c) 1995, 1996, 1997, 1998 Cygnus Solutions
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##
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##
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## The authors hereby grant permission to use, copy, modify, distribute,
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## The authors hereby grant permission to use, copy, modify, distribute,
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## and license this software and its documentation for any purpose, provided
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## and license this software and its documentation for any purpose, provided
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## that existing copyright notices are retained in all copies and that this
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## that existing copyright notices are retained in all copies and that this
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## notice is included verbatim in any distributions. No written agreement,
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## notice is included verbatim in any distributions. No written agreement,
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## license, or royalty fee is required for any of the authorized uses.
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## license, or royalty fee is required for any of the authorized uses.
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## Modifications to this software may be copyrighted by their authors
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## Modifications to this software may be copyrighted by their authors
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## and need not follow the licensing terms described here, provided that
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## and need not follow the licensing terms described here, provided that
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## the new terms are clearly indicated on the first page of each file where
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## the new terms are clearly indicated on the first page of each file where
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## they apply.
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## they apply.
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##
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##
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######COPYRIGHTEND####
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######COPYRIGHTEND####
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##------------------------------------------------------------------------------
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##------------------------------------------------------------------------------
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.file "crt0-eval.S"
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.file "crt0-eval.S"
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##------------------------------------------------------------------------------
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##------------------------------------------------------------------------------
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## Startup code
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## Startup code
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.equ DRAM_TOP,0x48100000
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.equ DRAM_TOP,0x48100000
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.text
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.text
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.globl __start
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.globl __start
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__start:
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__start:
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# Set up stack. Leave 4K at top for use by Cygmon.
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# Set up stack. Leave 4K at top for use by Cygmon.
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mov DRAM_TOP - 0x1000,a0
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mov DRAM_TOP - 0x1000,a0
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sub 8,a0
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sub 8,a0
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mov a0,sp
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mov a0,sp
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# Clear BSS
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# Clear BSS
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mov __bss_start,a0
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mov __bss_start,a0
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mov _end,a1
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mov _end,a1
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cmp a0,a1
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cmp a0,a1
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beq 8f
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beq 8f
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clr d0
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clr d0
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1:
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1:
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movbu d0,(a0)
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movbu d0,(a0)
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inc a0
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inc a0
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cmp a0,a1
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cmp a0,a1
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bne 1b
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bne 1b
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8:
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8:
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# Call constructors
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# Call constructors
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.extern ___main
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.extern ___main
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call ___main,[],0
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call ___main,[],0
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# Call main
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# Call main
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clr d0
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clr d0
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clr d1
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clr d1
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mov d0,(4,sp)
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mov d0,(4,sp)
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9:
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9:
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or 0x0800,psw # Enable interrupts
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or 0x0800,psw # Enable interrupts
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.extern _main
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.extern _main
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call _main,[],0
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call _main,[],0
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.extern __exit
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.extern __exit
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call __exit,[],0
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call __exit,[],0
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# bra 9b # Loop if we return
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# bra 9b # Loop if we return
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##------------------------------------------------------------------------------
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##------------------------------------------------------------------------------
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## end of crt0-eval.S
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## end of crt0-eval.S
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