59 lines
1 KiB
ArmAsm
59 lines
1 KiB
ArmAsm
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.define .sar
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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 .text
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! (on entry d0 contains the integer size in the descriptor)
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.sar:
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cmp.l #4, d0
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beq 9f
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move.l #EILLINS, -(sp)
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jmp .fatal
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9:
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! register usage:
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! a0: descriptor address, later base address
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! a1: return address
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! d0: index
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! d2: # bytes / element
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! For address calculation; see comment in 'aar.s'.
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! If the element size is a fraction of EM_WSIZE (4)
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! the calculation is done by adding.
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move.l (sp)+,a1 ! return address
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move.l (sp)+, a0
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move.l (sp)+, d0
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sub.l (a0), d0
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move.l 8(a0), d2 ! # bytes / element
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move.l (sp)+, a0
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clr.l d1
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cmp.l #1, d2
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bne 2f
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move.l (sp)+, d1
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move.b d1, 0(a0, d0.l) ! store one byte element
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bra 5f
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2:
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cmp.l #2, d2
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bne 4f
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asl.l #1, d0
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move.l (sp)+, d1
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move.w d1, 0(a0, d0.l) ! store two byte element
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bra 5f
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4: ! here: 4n byte element
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move.l a0,-(sp)
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move.l d0, -(sp)
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move.l d2, -(sp)
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jsr .mlu
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move.l (sp)+,a0
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add.l d1, a0 ! address of 4n byte element
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asr.l #2, d2
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sub.l #1, d2
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1:
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move.l (sp)+, (a0)+
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dbf d2, 1b
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5:
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jmp (a1)
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.align 2
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