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3c1cd0d867
The starting point is the CALL2051:REM <cmdline> approach. It uses the BASIC input buffer at $200. ProDOS stores the name of the loaded program at $280 (which we want for argv[0]) leaving us with 128 char buffer. If we run the program via exec() we don't need the CALL2051 but only the REM token (which is just one char). So have a maximum cmdline length of 126 (plus a terminating zero). There's no specification for ProDOS BIN file cmdline parameters so exec() just supports the CALL2051:REM <cmdline> approach. In contrast ProDOS SYS files allow for a 'startup filename'. A ProDOS filename is short than 126 chars so having exec() general cut the cmdline after 126 chars seems reasonable. If the SYS file we exec() allows for less we cut the cmdline further. Our 'loader.system' SYS file however allows for an unusually 126 char long "startup filename" as it is targeted towards cc65 BIN porgrams with their 126 cmdline length.
233 lines
6.2 KiB
ArmAsm
233 lines
6.2 KiB
ArmAsm
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; ;
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; LOADER.SYSTEM - an Apple][ ProDOS 8 loader for cc65 programs (Oliver Schmidt) ;
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; ;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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A1L := $3C
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A1H := $3D
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STACK := $0100
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BUF := $0200
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PATHNAME := $0280
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MLI := $BF00
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VERSION := $FBB3
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RDKEY := $FD0C
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PRBYTE := $FDDA
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COUT := $FDED
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QUIT_CALL = $65
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GET_FILE_INFO_CALL = $C4
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OPEN_CALL = $C8
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READ_CALL = $CA
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CLOSE_CALL = $CC
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FILE_NOT_FOUND_ERR = $46
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; ------------------------------------------------------------------------
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.import __CODE_0300_SIZE__, __DATA_0300_SIZE__
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.import __CODE_0300_LOAD__, __CODE_0300_RUN__
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; ------------------------------------------------------------------------
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.segment "DATA_2000"
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GET_FILE_INFO_PARAM:
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.byte $0A ;PARAM_COUNT
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.addr PATHNAME ;PATHNAME
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.byte $00 ;ACCESS
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.byte $00 ;FILE_TYPE
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FILE_INFO_ADDR: .word $0000 ;AUX_TYPE
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.byte $00 ;STORAGE_TYPE
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.word $0000 ;BLOCKS_USED
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.word $0000 ;MOD_DATE
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.word $0000 ;MOD_TIME
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.word $0000 ;CREATE_DATE
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.word $0000 ;CREATE_TIME
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OPEN_PARAM:
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.byte $03 ;PARAM_COUNT
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.addr PATHNAME ;PATHNAME
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.addr MLI - 1024 ;IO_BUFFER
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OPEN_REF: .byte $00 ;REF_NUM
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LOADING:
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.byte $0D
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.asciiz "Loading "
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ELLIPSES:
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.byte " ...", $0D, $0D, $00
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; ------------------------------------------------------------------------
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.segment "DATA_0300"
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READ_PARAM:
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.byte $04 ;PARAM_COUNT
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READ_REF: .byte $00 ;REF_NUM
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READ_ADDR: .addr $0000 ;DATA_BUFFER
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.word $FFFF ;REQUEST_COUNT
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.word $0000 ;TRANS_COUNT
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CLOSE_PARAM:
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.byte $01 ;PARAM_COUNT
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CLOSE_REF: .byte $00 ;REF_NUM
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QUIT_PARAM:
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.byte $04 ;PARAM_COUNT
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.byte $00 ;QUIT_TYPE
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.word $0000 ;RESERVED
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.byte $00 ;RESERVED
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.word $0000 ;RESERVED
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FILE_NOT_FOUND:
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.asciiz "... File Not Found"
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ERROR_NUMBER:
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.asciiz "... Error $"
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PRESS_ANY_KEY:
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.asciiz " - Press Any Key "
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; ------------------------------------------------------------------------
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.segment "CODE_2000"
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jmp :+
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.byte $EE
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.byte $EE
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.byte $7F
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STARTUP:.res $7F
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; Reset stack
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: ldx #$FF
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txs
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; Relocate CODE_0300 and DATA_0300
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ldx #<(__CODE_0300_SIZE__ + __DATA_0300_SIZE__)
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: lda __CODE_0300_LOAD__-1,x
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sta __CODE_0300_RUN__-1,x
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dex
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bne :-
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; Remove ".SYSTEM" from pathname
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lda PATHNAME
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sec
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sbc #.strlen(".SYSTEM")
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sta PATHNAME
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; Add trailing '\0' to pathname
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tax
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lda #$00
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sta PATHNAME+1,x
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; Copy ProDOS startup filename and trailing '\0' to stack
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ldx STARTUP
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lda #$00
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beq :++ ; Branch always
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: lda STARTUP+1,x
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: sta STACK,x
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dex
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bpl :--
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; Provide some user feedback
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lda #<LOADING
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ldx #>LOADING
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jsr PRINT
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lda #<(PATHNAME+1)
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ldx #>(PATHNAME+1)
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jsr PRINT
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lda #<ELLIPSES
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ldx #>ELLIPSES
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jsr PRINT
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jsr MLI
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.byte GET_FILE_INFO_CALL
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.word GET_FILE_INFO_PARAM
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bcc :+
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jmp ERROR
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: jsr MLI
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.byte OPEN_CALL
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.word OPEN_PARAM
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bcc :+
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jmp ERROR
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; Copy file reference number
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: lda OPEN_REF
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sta READ_REF
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sta CLOSE_REF
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; Get load address from aux-type
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lda FILE_INFO_ADDR
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ldx FILE_INFO_ADDR+1
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sta READ_ADDR
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stx READ_ADDR+1
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; It's high time to leave this place
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jmp __CODE_0300_RUN__
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; ------------------------------------------------------------------------
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.segment "CODE_0300"
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jsr MLI
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.byte READ_CALL
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.word READ_PARAM
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bcs ERROR
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jsr MLI
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.byte CLOSE_CALL
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.word CLOSE_PARAM
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bcs ERROR
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; Copy REM and startup filename to BASIC input buffer
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ldx #$00
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lda #$B2 ; REM token
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bne :++ ; Branch always
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: inx
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lda a:STACK-1,x
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: sta BUF,x
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bne :--
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; Go for it ...
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jmp (READ_ADDR)
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PRINT:
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sta A1L
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stx A1H
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ldx VERSION
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ldy #$00
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: lda (A1L),y
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beq :++
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cpx #$06 ; //e ?
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beq :+
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cmp #$60 ; lowercase ?
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bcc :+
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and #$5F ; -> uppercase
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: ora #$80
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jsr COUT
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iny
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bne :-- ; Branch always
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: rts
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ERROR:
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cmp #FILE_NOT_FOUND_ERR
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bne :+
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lda #<FILE_NOT_FOUND
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ldx #>FILE_NOT_FOUND
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jsr PRINT
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beq :++ ; Branch always
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: pha
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lda #<ERROR_NUMBER
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ldx #>ERROR_NUMBER
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jsr PRINT
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pla
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jsr PRBYTE
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: lda #<PRESS_ANY_KEY
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ldx #>PRESS_ANY_KEY
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jsr PRINT
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jsr RDKEY
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jsr MLI
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.byte QUIT_CALL
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.word QUIT_PARAM
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