; Mark Keates
; Freddy Offenga
; Christian Groessler
-;
-; This must be the *first* file on the linker command line
+; Stefan Haubenthal
;
.export _exit
- .import getargs, argc, argv
- .import __hinit, initconio, zerobss, pushax, doatexit
- .import _main,__filetab
- .import __CODE_LOAD__, __BSS_LOAD__
+ .export __STARTUP__ : absolute = 1 ; Mark as startup
- .include "atari.inc"
+ .import initlib, donelib
+ .import callmain, zerobss, callirq
+ .import __INTERRUPTOR_COUNT__
+ .import __STARTUP_LOAD__, __ZPSAVE_LOAD__
+ .import __RESERVED_MEMORY__
-; ------------------------------------------------------------------------
-; Define and export the ZP variables for the runtime
-
- .exportzp sp, sreg, regsave
- .exportzp ptr1, ptr2, ptr3, ptr4
- .exportzp tmp1, tmp2, tmp3, tmp4
- .exportzp fntemp, regbank, zpspace
-
-sp = $D2 ; (2bytes) stack pointer
-sreg = $D4 ; (2bytes) secondary register/high 16 bit for longs
-regsave = $D6 ; (4bytes) slot to save/restore (E)AX into
-ptr1 = $DA ; (2bytes)
-ptr2 = $DC ; (2bytes)
-ptr3 = $DE ; (2bytes)
-ptr4 = $E0 ; (2bytes)
-tmp1 = $E2 ; (1byte)
-tmp2 = $E3 ; (1byte)
-tmp3 = $E4 ; (1byte)
-tmp4 = $E5 ; (1byte)
-fntemp = $E6 ; (2bytes) pointer to file name
-regbank = $E8 ; (6bytes) 6 byte register bank
-zpspace = $EE - sp ; Zero page space allocated
+ .include "zeropage.inc"
+ .include "atari.inc"
; ------------------------------------------------------------------------
; EXE header
.segment "EXEHDR"
.word $FFFF
- .word __CODE_LOAD__
- .word __BSS_LOAD__ - 1
- .code
- .reloc
+ .word __STARTUP_LOAD__
+ .word __ZPSAVE_LOAD__ - 1
; ------------------------------------------------------------------------
; Actual code
+ .segment "STARTUP"
+
rts ; fix for SpartaDOS / OS/A+
; they first call the entry point from AUTOSTRT and
; then the load addess (this rts here).
; Save the zero page locations we need
- ldy #zpspace-1
-L1: lda sp,y
- sta zpsave,y
- dey
+ ldx #zpspace-1
+L1: lda sp,x
+ sta zpsave,x
+ dex
bpl L1
; Clear the BSS data
jsr zerobss
-; setup the stack
+; Setup the stack
tsx
stx spsave
-; report memory usage and initialize stack pointer
+; Report memory usage
lda APPMHI
- sta appmsav
+ sta appmsav ; remember old APPMHI value
lda APPMHI+1
sta appmsav+1
-
- lda #<$8000
- sta sp
- sta APPMHI
- lda #>$8000
- sta sp+1 ; Set argument stack ptr
+
+ sec
+ lda MEMTOP
+ sbc #<__RESERVED_MEMORY__
+ sta APPMHI ; initialize our APPMHI value
+ sta sp ; setup runtime stack part 1
+ lda MEMTOP+1
+ sbc #>__RESERVED_MEMORY__
sta APPMHI+1
-
-; set left margin to 0
+ sta sp+1 ; setup runtime stack part 2
+
+; If we have IRQ functions, chain our stub into the IRQ vector
+
+ lda #<__INTERRUPTOR_COUNT__
+ beq NoIRQ1
+ lda VVBLKI
+ ldx VVBLKI+1
+ sta IRQInd+1
+ stx IRQInd+2
+ lda #6
+ ldy #<IRQStub
+ ldx #>IRQStub
+ jsr SETVBV
+
+; Call module constructors
+
+NoIRQ1: jsr initlib
+
+; Set left margin to 0
lda LMARGN
sta old_lmargin
- lda #0
- sta LMARGN
+ ldy #0
+ sty LMARGN
-; set keyb to upper/lowercase mode
+; Set keyb to upper/lowercase mode
ldx SHFLOK
stx old_shflok
- sta SHFLOK
-
-; Initialize the heap
-
- jsr __hinit
+ sty SHFLOK
; Initialize conio stuff
- jsr initconio
+ dey ; Set X to $FF
+ sty CH
- lda #$FF
- sta CH
+; Push arguments and call main
-; ugly hack for now: set stdio stream handles
-; all to iocb #0
-; until we know where to go with fd<->iocb relation
-; this won't stay here!
+ jsr callmain
- lda #0
- sta __filetab + 2
- sta __filetab + 4
+; Call module destructors. This is also the _exit entry.
-; Pass command line if present
+_exit: jsr donelib ; Run module destructors
- jsr getargs
+; Reset the IRQ vector if we chained it.
- lda argc
- ldx argc+1
- jsr pushax ; argc
- lda #<argv
- ldx #>argv
- jsr pushax ; argv
+ pha ; Save the return code on stack
+ lda #<__INTERRUPTOR_COUNT__
+ beq NoIRQ2
+ lda #6
+ ldy IRQInd+1
+ ldx IRQInd+2
+ jsr SETVBV
- ldy #4 ; Argument size
- jsr _main ; call the users code
+; Restore system stuff
-; fall thru to exit...
-
-_exit: jsr doatexit ; call exit functions
-
- ldx spsave
+NoIRQ2: ldx spsave
txs ; Restore stack pointer
-; restore left margin
+; Restore left margin
lda old_lmargin
sta LMARGN
-; restore kb mode
+; Restore kb mode
lda old_shflok
sta SHFLOK
-; restore APPMHI
-
+; Restore APPMHI
+
lda appmsav
sta APPMHI
lda appmsav+1
; Copy back the zero page stuff
- ldy #zpspace-1
-L2: lda zpsave,y
- sta sp,y
- dey
+ ldx #zpspace-1
+L2: lda zpsave,x
+ sta sp,x
+ dex
bpl L2
+; Turn on cursor
+
+ inx
+ stx CRSINH
+
; Back to DOS
rts
+; ------------------------------------------------------------------------
+; The IRQ vector jumps here, if condes routines are defined with type 2.
+
+IRQStub:
+ cld ; Just to be sure
+ jsr callirq ; Call the functions
+ jmp IRQInd ; Jump to the saved IRQ vector
+
+; ------------------------------------------------------------------------
+; Data
+
.data
-zpsave: .res zpspace
-
-.bss
+IRQInd: jmp $0000
+
+; *** end of main startup code
+
+.segment "ZPSAVE"
+
+zpsave: .res zpspace
+
+ .bss
spsave: .res 1
appmsav: .res 1
old_lmargin: .res 1
.segment "AUTOSTRT"
- .word $02E0
- .word $02E1
- .word __CODE_LOAD__ + 1
+ .word RUNAD ; defined in atari.h
+ .word RUNAD+1
+ .word __STARTUP_LOAD__ + 1
projects / cc65 / blobdiff