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292 lines
8.4 KiB
ArmAsm
292 lines
8.4 KiB
ArmAsm
;
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; Oliver Schmidt, 2011-01-26
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;
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; int __fastcall__ exec (const char* progname, const char* cmdline);
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;
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.export _exec
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.import pushname, popname
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.import popax, done, _exit
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.include "zeropage.inc"
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.include "errno.inc"
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.include "apple2.inc"
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.include "mli.inc"
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; Wrong file type
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typerr: lda #$4A ; "Incompatible file format"
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; Cleanup name
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oserr: jsr popname ; Preserves A
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; Set __oserror
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jmp __mappederrno
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_exec:
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; Save cmdline
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sta ptr4
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stx ptr4+1
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; Get and push name
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jsr popax
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jsr pushname
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bne oserr
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; ProDOS TechRefMan, chapter 5.1.5.1:
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; "The complete or partial pathname of the system program
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; is stored at $280, starting with a length byte."
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; In fact BASIC.SYSTEM does the same for BLOAD and BRUN of
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; binary programs so we should do the same too in any case
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; especially as _we_ rely on it in mainargs.s for argv[0]
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ldy #$00
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lda (sp),y
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tay
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: lda (sp),y
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sta $0280,y
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dey
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bpl :-
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; Set pushed name
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lda sp
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ldx sp+1
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sta mliparam + MLI::INFO::PATHNAME
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stx mliparam + MLI::INFO::PATHNAME+1
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; Get file_type and aux_type
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lda #GET_INFO_CALL
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ldx #GET_INFO_COUNT
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jsr callmli
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bcs oserr
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; If we get here the program file at least exists so we copy
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; the loader stub right now and patch it later to set params
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ldx #size - 1
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: lda source,x
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sta target,x
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dex
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bpl :-
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; Check program file type
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lda mliparam + MLI::INFO::FILE_TYPE
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cmp #$FF ; SYS file?
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bne binary ; No, check for BIN file
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sta file_type ; Save file type for cmdline handling
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; SYS programs replace BASIC.SYSTEM so set in the ProDOS system bit map
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; protection for pages $80 - $BF just in case BASIC.SYSTEM is there now
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ldx #$0F ; Start with protection for pages $B8 - $BF
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lda #%00000001 ; Protect only system global page
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: sta $BF60,x ; Set protection for 8 pages
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lda #%00000000 ; Protect no page
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dex
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bpl :-
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bmi prodos ; Branch always
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binary: cmp #$06 ; BIN file?
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bne typerr ; No, wrong file type
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; Set BIN program load addr
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lda mliparam + MLI::INFO::AUX_TYPE
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ldx mliparam + MLI::INFO::AUX_TYPE+1
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sta data_buffer
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stx data_buffer+1
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; Check ProDOS system bit map for presence of BASIC.SYSTEM
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lda $BF6F ; Protection for pages $B8 - $BF
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cmp #%00000001 ; Exactly system global page is protected
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beq setvec
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; Get highest available mem addr from BASIC.SYSTEM
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ldx HIMEM+1 ; High byte
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bne setbuf ; Branch always
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; BIN programs are supposed to quit through one of the two DOS
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; vectors so we set up those to point to the ProDOS dispatcher
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setvec: ldx #$03 - 1 ; Size of JMP opcode
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: lda dosvec,x
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sta DOSWARM,x ; DOS warm start
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sta DOSWARM + 3,x ; DOS cold start
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dex
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bpl :-
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; No BASIC.SYSTEM so use addr of ProDOS system global page
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prodos: ldx #>$BF00 ; High byte
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; The I/O buffer needs to be page aligned
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setbuf: lda #$00 ; Low byte
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; The I/O buffer needs four pages
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dex
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dex
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dex
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dex
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; Set I/O buffer
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sta mliparam + MLI::OPEN::IO_BUFFER
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stx mliparam + MLI::OPEN::IO_BUFFER+1
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; PATHNAME already set
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.assert MLI::OPEN::PATHNAME = MLI::INFO::PATHNAME, error
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; Lower file level to avoid program file
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; being closed by C libary shutdown code
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ldx LEVEL
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stx level
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beq :+
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dec LEVEL
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; Open file
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: lda #OPEN_CALL
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ldx #OPEN_COUNT
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jsr callmli
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; Restore file level
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ldx level
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stx LEVEL
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bcc :+
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jmp oserr
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; Get and save fd
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: lda mliparam + MLI::OPEN::REF_NUM
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sta read_ref
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sta close_ref
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.ifdef __APPLE2ENH__
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; Calling the 80 column firmware needs the ROM switched
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; in, otherwise it copies the F8 ROM to the LC (@ $CEF4)
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bit $C082
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; ProDOS TechRefMan, chapter 5.3.1.3:
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; "80-column text cards -- and other Apple IIe features -- can
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; be turned off using the following sequence of instructions:"
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lda #$15
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jsr $C300
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; Switch in LC bank 2 for R/O
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bit $C080
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.endif
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; Reset stack as we already passed
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; the point of no return anyway
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ldx #$FF
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txs
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; Store up to 127 chars of cmdline (if any)
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; including terminating zero in stack page
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ldy #$00
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lda ptr4+1 ; NULL?
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beq :++ ; Yes, store as '\0'
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: lda (ptr4),y
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: sta $0100,y
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beq :+ ; '\0' stored, done
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iny
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cpy #$7E
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bcc :--
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lda #$00 ; '\0'
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beq :- ; Branch always
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; Call loader stub after C libary shutdown
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: lda #<target
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ldx #>target
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sta done+1
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stx done+2
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; Initiate C libary shutdown
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jmp _exit
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.bss
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level : .res 1
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.rodata
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; Read whole program file
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source: jsr $BF00
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.byte READ_CALL
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.word read_param
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bcs error
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; Close program file
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jsr $BF00
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.byte CLOSE_CALL
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.word close_param
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bcs error
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; Check for cmdline handling
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lda $0100 ; Valid cmdline?
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beq jump ; No, jump to program right away
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ldx file_type ; SYS file?
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bne system ; Yes, check for startup filename
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; Store REM and cmdline in BASIC input buffer
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lda #$B2 ; REM token
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bne :++ ; Branch always
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: inx
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lda a:$0100-1,x
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: sta $0200,x
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bne :--
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beq jump ; Branch always
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; Check for startup filename support
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; ProDOS TechRefMan, chapter 5.1.5.1:
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; "$2000 is a jump instruction. $2003 and $2004 are $EE."
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system: lda $2000
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cmp #$4C
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bne jump
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lda $2003
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cmp #$EE
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bne jump
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lda $2004
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cmp #$EE
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bne jump
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; Store cmdline in startup filename buffer
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ldx #$01
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: lda a:$0100-1,x
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beq :+
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sta $2006,x
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inx
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cpx $2005 ; Buffer full?
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bcc :- ; No, continue
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: dex
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stx $2006 ; Store cmdline length
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; Go for it ...
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jump: jmp (data_buffer)
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file_type = * - source + target
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.byte $00
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read_param = * - source + target
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.byte $04 ; PARAM_COUNT
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read_ref = * - source + target
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.byte $00 ; REF_NUM
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data_buffer = * - source + target
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.addr $2000 ; DATA_BUFFER
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.word $FFFF ; REQUEST_COUNT
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.word $0000 ; TRANS_COUNT
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close_param = * - source + target
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.byte $01 ; PARAM_COUNT
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close_ref = * - source + target
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.byte $00 ; REF_NUM
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; Quit to ProDOS dispatcher
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quit = * - source + target
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error: jsr $BF00
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.byte $65 ; QUIT
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.word quit_param
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quit_param = * - source + target
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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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size = * - source
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target = DOSWARM - size
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dosvec: jmp quit
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