83 lines
1.6 KiB
ArmAsm
83 lines
1.6 KiB
ArmAsm
.define _printf, _putchar, _getal, _char
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.sect .text
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.sect .rom
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.sect .data
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.sect .bss
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.sect .bss
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_getal:
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.space 12
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_char:
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.space 1
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.align 4
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.sect .data
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hexs:
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.ascii "0123456789abcdef"
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.align 4
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.sect .text
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_printf:
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movem.l d0/d1/d2/a0/a1/a2/a3/a4/a5/a6, -(sp)
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lea (44, sp), a6 ! a6 <- address of arguments
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move.l (a6)+, a5 ! a5 <- address of format
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next: move.b (a5)+, d0
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beq out
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cmp.b #'%', d0
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beq procnt
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put: move.l d0, -(sp)
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jsr (_putchar) ! long argument on stack
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tst.l (sp)+
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bra next
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procnt: move.b (a5)+, d0
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cmp.b #'d', d0 ! NOTE: %d means unsigned.
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beq digit
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cmp.b #'x', d0
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beq hex
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cmp.b #'s', d0
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beq string
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cmp.b #'%', d0 ! second % has to be printed.
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beq put
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tst.b -(a5) ! normal char should be printed
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bra next
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string: move.l (a6)+, a2 ! a2 <- address of string
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sloop: move.b (a2)+, d0
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beq next
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move.l d0, -(sp)
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jsr (_putchar) ! long argument on stack
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tst.l (sp)+
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bra sloop
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digit: move.l (a6)+, d1 ! d1 <- integer
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move.l #_getal+12, a2 ! a2 <- ptr to last part of buf
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clr.b -(a2) ! stringterminator
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1: divul.l #10, d2:d1 ! d1 <- qotient; d2 <- remainder
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add.l #'0', d2
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move.b d2, -(a2)
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tst.l d1 ! if quotient = 0 then ready
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bne 1b
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bra sloop ! print digitstring.
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hex: move.l (a6)+, d1 ! d1 <- integer
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move.l #_getal+12, a2 ! a2 <- ptr to last part of buf
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clr.b -(a2) ! stringterminator
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move.l #7, d2 ! loop control
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1: move.l d1, d0
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and.l #15, d0
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move.b (hexs,d0.w), -(a2) ! hex digit
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asr.l #4, d1
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dbf d2, 1b
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bra sloop
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out:
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movem.l (sp)+, d0/d1/d2/a0/a1/a2/a3/a4/a5/a6
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rts
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_putchar:
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move.l #1, -(sp)
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pea (11,sp)
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move.l #1, -(sp)
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jsr (_write)
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lea (12, sp), sp
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rts
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.align 2
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