56 lines
1.1 KiB
ArmAsm
56 lines
1.1 KiB
ArmAsm
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; Startup code for cc65 (Atari5200 version)
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;
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; by Christian Groessler (chris@groessler.org), 2014
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;
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.export _exit, start
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.export __STARTUP__ : absolute = 1 ; Mark as startup
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.import __RAM_START__, __RAM_SIZE__
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.import __RESERVED_MEMORY__
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.import initlib, donelib, callmain
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.import zerobss, copydata
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.include "zeropage.inc"
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.include "atari5200.inc"
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; ------------------------------------------------------------------------
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; Place the startup code in a special segment.
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.segment "STARTUP"
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start:
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; Clear the BSS data
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jsr zerobss
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; initialize data
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jsr copydata
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; setup the stack
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lda #<(__RAM_START__ + __RAM_SIZE__)
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sta sp
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lda #>(__RAM_START__ + __RAM_SIZE__)
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sta sp+1 ; Set argument stack ptr
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; Call module constructors
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jsr initlib
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; Push arguments and call main()
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jsr callmain
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; Call module destructors. This is also the _exit entry.
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_exit: jsr donelib ; Run module destructors
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; Reset the NES
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jmp start
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