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99cd0d3ac1
C64 PRG files are pretty common. Their salient feature is that they start with a 16-bit value that is used as the load address. The value is commonly generated by the assembler itself, rather than explicitly added to the source file. Not all assemblers know what a PRG file is, and some of them handle it in ways that are difficult to guarantee in SourceGen. ACME adds the 16-bit header when the output file name ends in ".prg", cc65 uses a modified config file, 64tass uses a different command-line option, and Merlin 32 has no idea what they are. This change adds PRG file detection and handling to the 64tass code generator. Doing so required making a few changes to the gen/asm interfaces, because we now need to have the generator pass additional flags to the assembler, and sometimes we need code generation to start somewhere other than offset zero. Overall the changes were pretty minor. The 20042-address-changes test needed a 6502-only variant. A new test (20040-address-changes) has been added and given a PRG header. As part of this change the 65816 variant was changed to use addresses in bank 2, which uncovered a code generation bug that this change also fixes. The 64tass --long-address flag doesn't appear to be necessary for files <= 65536 bytes long, so we no longer emit it for those. (issue #90)
118 lines
2.8 KiB
ArmAsm
118 lines
2.8 KiB
ArmAsm
; Copyright 2018 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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; 6502 version
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dw $1000 ;PRG-style header
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org $1000
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jsr one
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jsr three_p ;should land inside one
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jmp nextthing
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org $1100
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one bit one
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one_p lda #$11
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ldx #$11
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ldy #$11
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clv
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bvc one_p
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org $1100
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two bit two
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lda #$22
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two_p ldx #$22
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ldy #$22
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jmp two_p
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org $1100
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three bit three
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lda #$33
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ldx #$33
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three_p ldy #$33
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sec
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bcs three_p
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org $2000
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nextthing
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bit nextthing
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beq :fwd-8 ;should just appear as hex since it's outside
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bne :fwd ;BNE across org segments (always)
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org $2020
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:fwd bit :fwd
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beq offend ;branch off the end of the address area into dead space
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bne endcheck ; (which wouldn't be dead without the org)
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nop
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offend
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org $2080
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endcheck
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bit endcheck
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lda offend-1 ;touch bytes at the ends, and one byte before/after
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jsr offend-1
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lda offend
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jsr offend
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lda endcheck-1
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jsr endcheck-1
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lda endcheck
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jsr endcheck
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lda $00
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beq :midinst
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dfb $ad ;LDA abs
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org $2100
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:midinst dfb $ea,$ea
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jmp pastdata
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org $2800
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dw *
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ds 16 ;EDIT: put an org change in the middle
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org $2820
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ds 16
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org $3000
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pastdata
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bit pastdata
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lda #$44
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ldx #$44
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ldy #$44
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jmp :fwd
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dfb $00 ;put user label here or next inst
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:datend dfb $01
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org $3100
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dfb $02 ;data target should NOT get merged with previous user label
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:fwd
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bit :fwd
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lda :datend-1
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lda :datend
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lda :datend+1
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lda :datend+2
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lda :fwd-1
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beq :more
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dfb $ea,$ea ;EDIT: mark as inline data
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org $3180
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dfb $00,$01
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:more bit :more
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; xref edge case test: make sure adjustment shown is based on address
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lda label1
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lda label2 ;EDIT: set operand to sym=label1
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lda label3 ;EDIT: set operand to sym=label1
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clv
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bvc label3
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label1 nop
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label2 nop
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org $3200
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label3 bit label3
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dfb $00,$01 ;EDIT: mark as inline data to test execution off end
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; add nothing here -- execution should run off end
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