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https://github.com/cc65/cc65.git
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172 lines
2.5 KiB
ArmAsm
172 lines
2.5 KiB
ArmAsm
;
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; Startup code for cc65 (ATARI version)
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;
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; Contributing authors:
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; Mark Keates
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; Freddy Offenga
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; Christian Groessler
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;
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.export _exit
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.export __STARTUP__ : absolute = 1 ; Mark as startup
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.constructor initsp, 26
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.import initlib, donelib, callmain
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.import zerobss, pushax
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.import _main, __filetab, getfd
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.import __STARTUP_LOAD__, __ZPSAVE_LOAD__
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.import __RESERVED_MEMORY__
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.include "zeropage.inc"
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.include "atari.inc"
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; ------------------------------------------------------------------------
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; EXE header
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.segment "EXEHDR"
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.word $FFFF
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.word __STARTUP_LOAD__
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.word __ZPSAVE_LOAD__ - 1
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; ------------------------------------------------------------------------
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; Actual code
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.segment "STARTUP"
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rts ; fix for SpartaDOS / OS/A+
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; they first call the entry point from AUTOSTRT and
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; then the load addess (this rts here).
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; We point AUTOSTRT directly after the rts.
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; Real entry point:
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; Save the zero page locations we need
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ldx #zpspace-1
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L1: lda sp,x
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sta zpsave,x
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dex
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bpl L1
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; Clear the BSS data
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jsr zerobss
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; setup the stack
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tsx
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stx spsave
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; report memory usage
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lda APPMHI
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sta appmsav ; remember old APPMHI value
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lda APPMHI+1
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sta appmsav+1
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sec
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lda MEMTOP
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sbc #<__RESERVED_MEMORY__
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sta APPMHI ; initialize our APPMHI value
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lda MEMTOP+1
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sbc #>__RESERVED_MEMORY__
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sta APPMHI+1
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; Call module constructors
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jsr initlib
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; set left margin to 0
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lda LMARGN
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sta old_lmargin
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lda #0
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sta LMARGN
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; set keyb to upper/lowercase mode
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ldx SHFLOK
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stx old_shflok
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sta SHFLOK
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; Initialize conio stuff
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lda #$FF
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sta CH
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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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; Restore system stuff
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ldx spsave
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txs ; Restore stack pointer
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; restore left margin
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lda old_lmargin
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sta LMARGN
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; restore kb mode
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lda old_shflok
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sta SHFLOK
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; restore APPMHI
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lda appmsav
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sta APPMHI
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lda appmsav+1
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sta APPMHI+1
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; Copy back the zero page stuff
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ldx #zpspace-1
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L2: lda zpsave,x
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sta sp,x
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dex
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bpl L2
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; turn on cursor
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inx
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stx CRSINH
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; Back to DOS
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rts
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; *** end of main startup code
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; setup sp
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.segment "INIT"
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initsp:
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lda APPMHI
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sta sp
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lda APPMHI+1
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sta sp+1
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rts
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.segment "ZPSAVE"
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zpsave: .res zpspace
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.bss
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spsave: .res 1
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appmsav: .res 1
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old_shflok: .res 1
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old_lmargin: .res 1
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.segment "AUTOSTRT"
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.word RUNAD ; defined in atari.h
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.word RUNAD+1
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.word __STARTUP_LOAD__ + 1
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