mirror of
https://github.com/cc65/cc65.git
synced 2024-12-23 04:30:10 +00:00
99ecc9a609
separate module that contains a module constructor. In some cases, the code was even unnecessary, since the screen size is known in advance. git-svn-id: svn://svn.cc65.org/cc65/trunk@476 b7a2c559-68d2-44c3-8de9-860c34a00d81
311 lines
5.4 KiB
ArmAsm
311 lines
5.4 KiB
ArmAsm
;
|
|
; Startup code for cc65 (ATARI version)
|
|
;
|
|
; Contributing authors:
|
|
; Mark Keates
|
|
; Freddy Offenga
|
|
; Christian Groessler
|
|
;
|
|
; This must be the *first* file on the linker command line
|
|
;
|
|
|
|
RESERVE_MOUSE_MEMORY = 1 ; for P/M
|
|
|
|
.ifdef RESERVE_MOUSE_MEMORY
|
|
.export mouse_pm0
|
|
.endif
|
|
.export _exit
|
|
.import getargs, argc, argv
|
|
.import initlib, donelib
|
|
.import zerobss, pushax
|
|
.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
|
|
|
|
zpspace = * - zpstart ; Zero page space allocated
|
|
|
|
.code
|
|
|
|
; ------------------------------------------------------------------------
|
|
; EXE header
|
|
|
|
.segment "EXEHDR"
|
|
.word $FFFF
|
|
.word __CODE_LOAD__
|
|
.word __BSS_LOAD__ - 1
|
|
.code
|
|
.reloc
|
|
|
|
; ------------------------------------------------------------------------
|
|
; Actual code
|
|
|
|
rts ; fix for SpartaDOS / OS/A+
|
|
; they first call the entry point from AUTOSTRT and
|
|
; then the load addess (this rts here).
|
|
; We point AUTOSTRT directly after the rts.
|
|
|
|
; Real entry point:
|
|
|
|
; Save the zero page locations we need
|
|
|
|
ldx #zpspace-1
|
|
L1: lda sp,x
|
|
sta zpsave,x
|
|
dex
|
|
bpl L1
|
|
|
|
; Clear the BSS data
|
|
|
|
jsr zerobss
|
|
|
|
; setup the stack
|
|
|
|
tsx
|
|
stx spsave
|
|
|
|
; report memory usage and initialize stack pointer
|
|
|
|
lda APPMHI
|
|
sta appmsav
|
|
lda APPMHI+1
|
|
sta appmsav+1
|
|
|
|
jsr getmemtop ; adjust for graphics mode to use
|
|
|
|
sta sp
|
|
sta APPMHI
|
|
stx sp+1 ; Set argument stack ptr
|
|
stx APPMHI+1
|
|
|
|
; set left margin to 0
|
|
|
|
lda LMARGN
|
|
sta old_lmargin
|
|
lda #0
|
|
sta LMARGN
|
|
|
|
; set keyb to upper/lowercase mode
|
|
|
|
ldx SHFLOK
|
|
stx old_shflok
|
|
sta SHFLOK
|
|
|
|
; Call module constructors
|
|
|
|
jsr initlib
|
|
|
|
; Initialize conio stuff
|
|
|
|
lda #$FF
|
|
sta CH
|
|
|
|
; set stdio stream handles
|
|
|
|
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
|
|
|
|
; Pass command line if present
|
|
|
|
jsr getargs
|
|
|
|
lda argc
|
|
ldx argc+1
|
|
jsr pushax ; argc
|
|
lda #<argv
|
|
ldx #>argv
|
|
jsr pushax ; argv
|
|
|
|
ldy #4 ; Argument size
|
|
jsr _main ; call the users code
|
|
|
|
; Call module destructors. This is also the _exit entry.
|
|
|
|
_exit: jsr donelib ; Run module destructors
|
|
|
|
; Restore system stuff
|
|
|
|
ldx spsave
|
|
txs ; Restore stack pointer
|
|
|
|
; restore left margin
|
|
|
|
lda old_lmargin
|
|
sta LMARGN
|
|
|
|
; restore kb mode
|
|
|
|
lda old_shflok
|
|
sta SHFLOK
|
|
|
|
; restore APPMHI
|
|
|
|
lda appmsav
|
|
sta APPMHI
|
|
lda appmsav+1
|
|
sta APPMHI+1
|
|
|
|
; Copy back the zero page stuff
|
|
|
|
ldx #zpspace-1
|
|
L2: lda zpsave,x
|
|
sta sp,x
|
|
dex
|
|
bpl L2
|
|
|
|
; Back to DOS
|
|
|
|
rts
|
|
|
|
; *** end of main startup code
|
|
|
|
|
|
; 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
|
|
.ifdef RESERVE_MOUSE_MEMORY
|
|
|
|
adj_mouse:
|
|
txa ; get upper byte of address
|
|
and #%11111000 ; make 2k aligned
|
|
sec
|
|
sbc #%00001000 ; reserve 2k
|
|
tax
|
|
adc #3 ; add 4 (C = 1)
|
|
sta mouse_pm0
|
|
lda #0
|
|
.endif
|
|
rts
|
|
|
|
ignore: lda MEMTOP
|
|
ldx MEMTOP+1
|
|
.ifdef RESERVE_MOUSE_MEMORY
|
|
bne adj_mouse
|
|
.else
|
|
rts
|
|
.endif
|
|
|
|
.endproc
|
|
|
|
.data
|
|
|
|
zpsave: .res zpspace
|
|
|
|
.rodata
|
|
|
|
; 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
|
|
appmsav: .res 1
|
|
old_shflok: .res 1
|
|
old_lmargin: .res 1
|
|
.ifdef RESERVE_MOUSE_MEMORY
|
|
mouse_pm0: .res 1
|
|
.endif
|
|
|
|
.segment "AUTOSTRT"
|
|
.word $02E0
|
|
.word $02E1
|
|
.word __CODE_LOAD__ + 1
|