72 lines
1.2 KiB
Plaintext
72 lines
1.2 KiB
Plaintext
; This ROM implementation of the MPDispatch trap (AA7F) only implements two
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; selectors, both for writing to the NanoKernel framebuffer/serial log.
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; To print a C string:
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; PEA @cstring
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; MOVE #-3, -(SP)
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; DC.W $AA7F
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; To print a hex string:
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; MOVE.L #value, -(SP)
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; MOVE #2, -(SP) ; 1: byte, 2: word, else: long
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; MOVE #-2, -(SP)
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; DC.W $AA7F
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MPDispatchStubTrap PROC EXPORT
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CmpI #-3, $4(SP)
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BEQ.S NKxprintf
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CmpI #-2, $4(SP) ;
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BEQ.S NKPrintHex
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Pea.L @errStr ; ERROR
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Clr -(SP)
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Bsr NKxprintf
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MoveQ.L #$0, D0
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Move $4(SP), D0
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Move.L D0, -(SP)
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Move.L #$2, -(SP)
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Clr -(SP)
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Bsr NKPrintHex
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Rts
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string Pascal
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@errStr dc.b 'Unknown MPDispatch selector: ', 0, 0
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NKxprintf
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MoveA.L $6(SP), A0
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@loop Move.B (A0)+, D0 ; iterate over string to get it in physical RAM?
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BNE.S @loop
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MoveA.L $6(SP), A0
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MoveQ.L #96, D0 ; call NKXprintf
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dc.w $fe1f
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MoveA.L (SP)+, A0 ; return
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AddQ.L #$6, SP
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Jmp (A0)
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NKPrintHex
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MoveA.L $A(SP), A0 ; r3 arg (value to print)
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Move.L $6(SP), D1 ; r4 arg (1: byte, 2: 2byte, else: 4byte)
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MoveQ.L #97, D0 ; call NKPrintHex
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dc.w $fe1f
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MoveA.L (SP)+, A0 ; return
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dc.w $defc, $000A
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; AddA.W #$A, SP
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Jmp (A0)
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END
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