79 lines
1.4 KiB
ArmAsm
79 lines
1.4 KiB
ArmAsm
.define _printf
|
|
.define _putchar
|
|
.define _getal
|
|
.define _char
|
|
.bss
|
|
_getal:
|
|
.space 12
|
|
_char:
|
|
.space 1
|
|
.align 2
|
|
.data
|
|
sav:
|
|
.long 0
|
|
.text
|
|
_printf:
|
|
movem.l d0/d1/d2/a0/a1/a2/a3/a4/a5/a6,.savreg
|
|
move.l (sp)+,sav !return address
|
|
move.l sp,a6 !a6 <- address of arguments
|
|
move.l (a6)+,a5 !a5 <- address of format
|
|
clr.l d0 !d0 <- char to be printed
|
|
next: move.b (a5)+,d0
|
|
beq out
|
|
cmp.b #'%',d0
|
|
beq procnt
|
|
put: move.l d0,-(sp)
|
|
jsr _putchar !argument is long en op de stack
|
|
tst.l (sp)+
|
|
jmp next
|
|
|
|
procnt: move.b (a5)+,d0
|
|
cmp.b #'d',d0 !NOTE: %d means unsigned.
|
|
beq digit
|
|
cmp.b #'s',d0
|
|
beq string
|
|
cmp.b #'%',d0 !second % has to be printed.
|
|
beq put
|
|
tst.b -(a5) !normal char should be printed
|
|
jmp next
|
|
|
|
string: move.l (a6)+,a2 !a2 <- address of string
|
|
sloop: move.b (a2)+,d0
|
|
beq next
|
|
move.l d0,-(sp)
|
|
jsr _putchar !argument is long en op de stack
|
|
tst.l (sp)+
|
|
jmp sloop
|
|
|
|
digit: move.l (a6)+,d1 !d1 <- integer
|
|
move.l #_getal+12,a3 !a3 <- ptr to last part of buf
|
|
move.b #0,-(a3) !stringterminator
|
|
dloop: move.l d1,-(sp)
|
|
move.l #10,-(sp)
|
|
jsr .dvu !d1 <- quotient d2 <- remainder
|
|
add.l #'0',d2
|
|
move.b d2,-(a3)
|
|
tst.l d1 !if quotient = 0 then ready
|
|
bne dloop
|
|
move.l a3,a2
|
|
jmp sloop !print digitstring.
|
|
|
|
out:
|
|
move.l sav,-(sp)
|
|
movem.l .savreg,d0/d1/d2/a0/a1/a2/a3/a4/a5/a6
|
|
rts
|
|
|
|
|
|
_putchar:
|
|
movem.l d0,.savreg
|
|
move.l 4(sp),d0
|
|
move.b d0,_char
|
|
move.l #1,-(sp)
|
|
move.l #_char,-(sp)
|
|
move.l #1,-(sp)
|
|
jsr _write
|
|
add.l #12,sp
|
|
movem.l .savreg,d0
|
|
rts
|
|
.align 2
|