mirror of
https://github.com/cc65/cc65.git
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202 lines
4.3 KiB
ArmAsm
202 lines
4.3 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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; Stefan Haubenthal
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;
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.export __STARTUP__ : absolute = 1 ; Mark as startup
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.export _exit, start
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.import initlib, donelib
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.import callmain, zerobss
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.import __RESERVED_MEMORY__
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.import __RAM_START__, __RAM_SIZE__
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.ifdef __ATARIXL__
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.import __STACKSIZE__
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.import sram_init
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.import scrdev
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.import findfreeiocb
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.forceimport sramprep ; force inclusion of the "shadow RAM preparation" load chunk
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.include "save_area.inc"
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.endif
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.include "zeropage.inc"
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.include "atari.inc"
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; ------------------------------------------------------------------------
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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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start:
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.ifdef __ATARIXL__
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jsr sram_init
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.endif
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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 SP_save
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.ifndef __ATARIXL__
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; Report memory usage
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lda APPMHI
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sta APPMHI_save ; remember old APPMHI value
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lda APPMHI+1
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sta APPMHI_save+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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sta sp ; setup runtime stack part 1
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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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sta sp+1 ; setup runtime stack part 2
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.else
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lda #<(__RAM_START__ + __RAM_SIZE__ + __STACKSIZE__)
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sta sp
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lda #>(__RAM_START__ + __RAM_SIZE__ + __STACKSIZE__)
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sta sp+1
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.endif
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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 LMARGN_save
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ldy #0
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sty LMARGN
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; Set keyb to upper/lowercase mode
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ldx SHFLOK
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stx SHFLOK_save
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sty SHFLOK
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; Initialize conio stuff
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dey ; Set X to $FF
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sty 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 SP_save
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txs ; Restore stack pointer
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; Restore left margin
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lda LMARGN_save
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sta LMARGN
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; Restore kb mode
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lda SHFLOK_save
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sta SHFLOK
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; Restore APPMHI
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lda APPMHI_save
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sta APPMHI
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lda APPMHI_save+1
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sta APPMHI+1
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.ifdef __ATARIXL__
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; Atari XL target stuff...
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lda PORTB_save
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sta PORTB
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lda RAMTOP_save
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sta RAMTOP
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lda MEMTOP_save
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sta MEMTOP
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lda MEMTOP_save+1
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sta MEMTOP+1
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; Issue a GRAPHICS 0 call (copied'n'pasted from TGI drivers) in
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; order to restore screen memory to its defailt location just
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; before the ROM.
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jsr findfreeiocb
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; Reopen it in Graphics 0
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lda #OPEN
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sta ICCOM,x
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lda #OPNIN | OPNOT
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sta ICAX1,x
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lda #0
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sta ICAX2,x
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lda #<scrdev
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sta ICBAL,x
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lda #>scrdev
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sta ICBAH,x
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lda #3
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sta ICBLL,x
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lda #0
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sta ICBLH,x
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jsr CIOV_org
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; No error checking here, shouldn't happen(tm), and no way to
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; recover anyway.
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lda #CLOSE
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sta ICCOM,x
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jsr CIOV_org
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.endif
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; Turn on cursor
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ldx #0
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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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; ------------------------------------------------------------------------
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.bss
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SP_save: .res 1
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SHFLOK_save: .res 1
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LMARGN_save: .res 1
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.ifndef __ATARIXL__
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APPMHI_save: .res 2
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.endif
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