; 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,getfd
- .import __CODE_LOAD__, __BSS_LOAD__
- .import __graphmode_used
-
- .include "atari.inc"
-
-; ------------------------------------------------------------------------
-; 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
-
-
-.zeropage
-
-zpstart = *
-sp: .res 2 ; Stack pointer
-sreg: .res 2 ; Secondary register/high 16 bit for longs
-regsave: .res 2 ; slot to save/restore (E)AX into
-ptr1: .res 2
-ptr2: .res 2
-ptr3: .res 2
-ptr4: .res 2
-tmp1: .res 1
-tmp2: .res 1
-tmp3: .res 1
-tmp4: .res 1
-fntemp: .res 2 ; Pointer to file name
-regbank: .res 6 ; 6 byte register bank
+ .export __STARTUP__ : absolute = 1 ; Mark as startup
-zpspace = * - zpstart ; Zero page space allocated
+ .import initlib, donelib
+ .import callmain, zerobss, callirq
+ .import __INTERRUPTOR_COUNT__
+ .import __STARTUP_LOAD__, __ZPSAVE_LOAD__
+ .import __RESERVED_MEMORY__
-.code
+ .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
- jsr getmemtop ; adjust for graphics mode to use
+ 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
+ sta sp+1 ; setup runtime stack part 2
- sta sp
- sta APPMHI
- stx sp+1 ; Set argument stack ptr
- stx APPMHI+1
+; 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
-; set left margin to 0
+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
-; set stdio stream handles
+ jsr callmain
- lda #0
- jsr getfd
- sta __filetab ; setup stdin
- lda #0
- jsr getfd
- sta __filetab + 2 ; setup stdout
- lda #0
- jsr getfd
- sta __filetab + 4 ; setup stderr
+; 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
; 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
-; *** end of main startup code
+; ------------------------------------------------------------------------
+; 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
-; calc. upper memory limit to use
+; ------------------------------------------------------------------------
+; Data
-.proc getmemtop
+.data
- ldy __graphmode_used
- beq ignore ; mode 0 doesn't need adjustment
- cpy #32
- bcs ignore ; invalid value
+IRQInd: jmp $0000
- tya
- asl a
- tay
- lda MEMTOP
- sec
- sbc grmemusage,y
- pha
- lda MEMTOP+1
- sbc grmemusage+1,y
- tax
- pla
- rts
+; *** end of main startup code
-ignore: lda MEMTOP
- ldx MEMTOP+1
- rts
+.segment "ZPSAVE"
-.endproc
-
- .data
-
-zpsave: .res zpspace
-
-; memory usage of the different graphics modes (0-31)
-; values < 0 of "bytes needed" are mappped to 0
-; bytes needed ; mode ; val. of MEMTOP
-grmemusage:
- .word 0 ; 0 ; 39967
- .word 0 ;-318 ; 1 ; 40285
- .word 0 ;-568 ; 2 ; 40535
- .word 0 ;-558 ; 3 ; 40525
- .word 0 ;-298 ; 4 ; 40265
- .word 182 ; 5 ; 39785
- .word 1182 ; 6 ; 38785
- .word 3198 ; 7 ; 36769
- .word 7120 ; 8 ; 32847
- .word 7146 ; 9 ; 32821
- .word 7146 ; 10 ; 32821
- .word 7146 ; 11 ; 32821
- .word 162 ; 12 ; 39805
- .word 0 ;-328 ; 13 ; 40295
- .word 3278 ; 14 ; 36689
- .word 7120 ; 15 ; 32847
- .word 0 ; 16 ; 39967
- .word 0 ;-320 ; 17 ; 40287
- .word 0 ;-572 ; 18 ; 40539
- .word 0 ;-560 ; 19 ; 40527
- .word 0 ;-296 ; 20 ; 40263
- .word 184 ; 21 ; 39783
- .word 1192 ; 22 ; 38775
- .word 3208 ; 23 ; 36759
- .word 7146 ; 24 ; 32821
- .word 7146 ; 25 ; 32821
- .word 7146 ; 26 ; 32821
- .word 7146 ; 27 ; 32821
- .word 160 ; 28 ; 39807
- .word 0 ;-332 ; 29 ; 40299
- .word 3304 ; 30 ; 36663
- .word 7146 ; 31 ; 32821
-
-; the program used to get these values (Atari BASIC):
-; 100 FILE=0
-; 110 IF FILE=1 THEN OPEN #1,8,0,"D:FREEMEM.OUT"
-; 120 IF FILE<>1 THEN OPEN #1,8,0,"E:"
-; 200 DIM G(32)
-; 210 FOR I=0 TO 32:GRAPHICS I:GOSUB 1000:G(I)=VAL:NEXT I
-; 220 GRAPHICS 0
-; 230 FOR I=0 TO 31:PRINT #1;I;":",G(I);" - ";G(0)-G(I):NEXT I
-; 240 CLOSE #1
-; 999 END
-; 1000 VAL=PEEK(741)+256*PEEK(742)
-; 1010 RETURN
+zpsave: .res zpspace
.bss
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