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cc65/libsrc/atari5200/crt0.s

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;
; Startup code for cc65 (Atari5200 version)
;
; Christian Groessler (chris@groessler.org), 2014
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;
.export _exit, start
.export __STARTUP__ : absolute = 1 ; Mark as startup
.import __RAM_START__, __RAM_SIZE__
.import __RESERVED_MEMORY__
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.import initlib, donelib, callmain
.import zerobss, copydata
.include "zeropage.inc"
.include "atari5200.inc"
start:
; Clear the BSS data.
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jsr zerobss
; Initialize the data.
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jsr copydata
; Set up the stack.
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lda #<(__RAM_START__ + __RAM_SIZE__ - __RESERVED_MEMORY__)
ldx #>(__RAM_START__ + __RAM_SIZE__ - __RESERVED_MEMORY__)
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sta sp
stx sp+1 ; Set argument stack ptr
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; Call the module constructors.
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jsr initlib
; Push the command-line arguments; and, call main().
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jsr callmain
; Call the module destructors. This is also the exit() entry.
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_exit: jsr donelib ; Run module destructors
; A 5200 program isn't supposed to exit.
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halt: jmp halt