;
.export _exit
+ .constructor initsp,26
+
.import getargs, argc, argv
- .import __hinit, initconio, zerobss, pushax, doatexit
+ .import initlib, donelib
+ .import zerobss, pushax
.import _main,__filetab,getfd
.import __CODE_LOAD__, __BSS_LOAD__
- .import __graphmode_used
+ .include "zeropage.inc"
.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
-
-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 "_file.inc"
; ------------------------------------------------------------------------
; EXE header
.word $FFFF
.word __CODE_LOAD__
.word __BSS_LOAD__ - 1
- .code
- .reloc
; ------------------------------------------------------------------------
; Actual code
+.code
+
rts ; fix for SpartaDOS / OS/A+
; they first call the entry point from AUTOSTRT and
; then the load addess (this rts here).
; Save the zero page locations we need
- ldy #zpspace-1
-L1: lda sp,y
- sta zpsave,y
- dey
+ ldx #zpspace-1
+L1: lda sp,x
+ sta zpsave,x
+ dex
bpl L1
; Clear the BSS data
tsx
stx spsave
-; report memory usage and initialize stack pointer
+; report memory usage
lda APPMHI
- sta appmsav
+ sta appmsav ; remember old APPMHI value
lda APPMHI+1
sta appmsav+1
- jsr getmemtop ; adjust for graphics mode to use
-
- sta sp
- sta APPMHI
- stx sp+1 ; Set argument stack ptr
+ lda MEMTOP
+ sta APPMHI ; initialize our APPMHI value
+ ldx MEMTOP+1
stx APPMHI+1
-
+
+; Call module constructors
+
+ jsr initlib
+
; set left margin to 0
lda LMARGN
ldx SHFLOK
stx old_shflok
sta SHFLOK
-
-; Initialize the heap
-
- jsr __hinit
; Initialize conio stuff
- jsr initconio
-
lda #$FF
sta CH
lda #0
jsr getfd
- sta __filetab ; setup stdin
+ sta __filetab + (0 * _FILE_size) ; setup stdin
lda #0
jsr getfd
- sta __filetab + 2 ; setup stdout
+ sta __filetab + (1 * _FILE_size) ; setup stdout
lda #0
jsr getfd
- sta __filetab + 4 ; setup stderr
+ sta __filetab + (2 * _FILE_size) ; setup stderr
; Pass command line if present
lda argc
ldx argc+1
- jsr pushax ; argc
+ jsr pushax ; argc
lda #<argv
ldx #>argv
- jsr pushax ; argv
+ jsr pushax ; argv
+
+ ldy #4 ; Argument size
+ jsr _main ; call the users code
- ldy #4 ; Argument size
- jsr _main ; call the users code
+; Call module destructors. This is also the _exit entry.
-; fall thru to exit...
+_exit: jsr donelib ; Run module destructors
-_exit: jsr doatexit ; call exit functions
+; Restore system stuff
ldx spsave
- txs ; Restore stack pointer
+ txs ; Restore stack pointer
; restore left margin
sta SHFLOK
; 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
; Back to DOS
; *** end of main startup code
+; setup sp
-; calc. upper memory limit to use
-
-.proc getmemtop
-
- ldy __graphmode_used
- beq ignore ; mode 0 doesn't need adjustment
- cpy #32
- bcs ignore ; invalid value
-
- tya
- asl a
- tay
- lda MEMTOP
- sec
- sbc grmemusage,y
- pha
- lda MEMTOP+1
- sbc grmemusage+1,y
- tax
- pla
- rts
-
-ignore: lda MEMTOP
- ldx MEMTOP+1
+initsp:
+ lda APPMHI
+ sta sp
+ lda APPMHI+1
+ sta sp+1
rts
-.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
-
.bss
spsave: .res 1
projects / cc65 / blobdiff