mirror of https://github.com/marketideas/qasm.git
112 lines
3.6 KiB
ArmAsm
112 lines
3.6 KiB
ArmAsm
; Copyright 2019 faddenSoft. All Rights Reserved.
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; See the LICENSE.txt file for distribution terms (Apache 2.0).
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;
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; Assembler: Merlin 32
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; EDIT: the project must include the platform symbol file and extension script
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PrintInlineL1String equ $011000
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PrintInlineL2String equ $012000
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PrintInlineDciString equ $013000 ;EDIT: add to project symbols
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org $1000
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clc
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xce
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sep #$30
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mx %11
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; check basics
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jsr PrintInline8String
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asc '01234567'
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jsr PrintInlineRev8String
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asc '76543210'
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jsr PrintInlineNullString
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asc 'null-term string',00
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jsl PrintInlineL1String
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str 'string with length/1'
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jsl PrintInlineL2String
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strl 'string with length/2'
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jsl PrintInlineDciString
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dci 'DCI string'
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; check errors
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jsr broken
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jsr off_end
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jsr too_long
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; check block formatting
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brk $01
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dw data01
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brk $02
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dw data02
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; Handle an edge case where the inline formatting gets thrown out.
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; Two paths: BIT $A9 / BRK $85 / inline $FF/EA goes first, then
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; LDA $00 / STA $FF / NOP goes. When we get to the STA we notice
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; that it's marked as inline data, so we remove it from $85 $ff
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; but not from $ea.
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;
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; If we try to walk through the file, advancing offset by the anattrib
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; length, we will traverse the first path, which (with 2-byte BRKs)
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; runs into the $FF, which is marked as an instruction but not an
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; instruction start.
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;
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; Switching to 1-byte BRKs makes the $85 an inline data item rather
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; than an instruction. When we come back through, we LDA $00 and
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; then skip over the next 3 bytes. No conflict.
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nop
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jsr edge1 ;alt path, evaluated later
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dfb $24 ;1: BIT dp
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edge1 dfb $a9 ;2: LDA imm
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brk ;1: BRK <op>
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dfb $85 ;2: STA imm
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dfb $ff ;1: address $eaff
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nop ;2:
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rts
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PrintInline8String rts ;EDIT: set label
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PrintInlineRev8String rts ;EDIT: set label
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PrintInlineNullString rts ;EDIT: set label
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data01 ;EDIT: set label
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dw $1122 ;should be little-endian
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dw $4433 ;should be big-endian
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hex 55667788 ;32-bit
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hex 99887766 ;32-bit big-endian
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dfb 'f' ;ASCII
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dfb "F" ;high ASCII
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hex 40C142C344C546C7 ;bad DCI string
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hex 002001 ;24-bit addr
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dw data02 ;by symbol
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dfb $80
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data02 ;EDIT: set label, must be "data02"
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dw data03
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dfb $80
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data03 ;EDIT: set label
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asc "AllEight"
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; check address split across string
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broken jsr PrintInlineNullString
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asc 'broken ',01
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org $1100 ;EDIT: split address
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asc 'string',00
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rts
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too_long jsl PrintInlineL2String
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dw END-*+1 ;should be 1 byte over; want it to be rejected by
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rts ; function in .cs (otherwise code overlap race)
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; MUST be last
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off_end jsr PrintInlineNullString
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nonterm asc 'end'
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END equ *
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