Throw out previous x86 stuff
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234
bdos/8086.asm
234
bdos/8086.asm
@ -1,234 +0,0 @@
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ORG BDOS
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%include "hdr/bios.asm"
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%include "hdr/fcb.asm"
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%include "hdr/bpb.asm"
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DISKBUF: EQU (BDOS-0x200) ; deblocking
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DISKBPB: EQU (DISKBUF-21) ; BPB of the current driv
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DISKDRV: EQU (DISKBPB-1) ; BYTE denoting drive of current fcb (1=A, ...)
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PROGBX: EQU (DISKDRV-2)
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STACK: EQU (PROGBX & 0xFFFE) ; even address, grows down
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DEFDRV: EQU 4 ; default drive when opening a FCB (1=A, ...)
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SYSCALL:
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MOV [PROGBX], BX
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XOR BH, BH
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MOV BL, CL
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ADD BX, BX
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ADD BX, FUNCS
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MOV BX, [BX]
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PUSH BX
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MOV BX, [PROGBX]
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SYSRET:
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RET
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FUNCS:
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DW SETUP,GETC,PUTC,SYSRET
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DW SYSRET,SYSRET,SYSRET,SYSRET
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DW SYSRET,PUTS,GETS,STATUS
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DW SYSRET,DISKRST,SETDEFDSK,FCBOPEN
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DW SYSRET,SYSRET,SYSRET,SYSRET
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DW SYSRET,SYSRET,SYSRET,SYSRET
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SETUP:
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MOV SP, STACK
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MOV BYTE [DEFDRV], 0x01
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MOV CX, DISKBUF
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CALL SETDMA
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SUB SP, 0x20
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MOV BX, SP
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CALL FCBOPEN
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CLI
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HALT:
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HLT
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JMP HALT
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GETC:
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CALL CONIN
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TEST AL, AL
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JZ GETC
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PUSH DX
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MOV DL, AL
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CALL CONOUT
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POP DX
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ret
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PUTC:
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JMP CONOUT
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PUTS:
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PUSH SI
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MOV SI, DX
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PUTS_L:
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MOV DL, BYTE [SI]
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CMP DL, '$'
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JZ PUTS_E
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CALL CONOUT
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INC SI
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JMP PUTS_L
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PUTS_E:
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POP SI
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RET
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; BX base ptr to buffer
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; CH maximum BL
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; CL minimum BL
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GETS:
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PUSH AX
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PUSH CX
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PUSH DX
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PUSH BX
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; BX is base pointer
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MOV BX, DX
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; CL is maximum, CH is current position
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MOV CX, [BX]
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XOR CH, CH
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; BX starts at actual character area
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ADD BX, 2
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GETS_L:
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; Read and maybe handle control chars
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CALL GETC
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CMP AL, 0x0D
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JE GETS_E
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CMP AL, 8
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JE GETS_BS
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; Store character
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PUSH BX
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ADD BL, CH
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ADC BH, 0
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MOV [BX], AL
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POP BX
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; Loop if we arent full yet
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INC CH
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CMP CH, CL
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JC GETS_L
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GETS_E:
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; Append LF to CR
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MOV DL, 0x0A
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CALL PUTC
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; Write back length data
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SUB BX, 2
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MOV [BX], CX
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; Restore registers
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POP BX
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POP DX
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POP CX
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POP AX
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ret
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GETS_BS:
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TEST CH, CH
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JZ GETS_L
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MOV DL, 0x20
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CALL PUTC
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MOV DL, 8
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CALL PUTC
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DEC CL
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JMP GETS_L
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STATUS:
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JMP CONST
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DISKRST:
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MOV BYTE [DISKDRV], 0xFF
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RET
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SETDEFDSK:
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MOV BYTE [DEFDRV], DL
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RET
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FCBOPEN:
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MOV CL, BYTE [BX]
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TEST CL, CL
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JNZ NODEFDRV
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MOV CL, BYTE [DEFDRV]
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MOV BYTE [BX], CL
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NODEFDRV:
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CALL LOADBPB
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MOV CX, [DISKBPB+BPB_RDE]
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CALL FATSIZE
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ADD DX, WORD [DISKBPB+BPB_RSC]
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CALL SETLSEC
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CALL READ
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MOV AX, [DISKBUF]
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INT3
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; TODO: search for file in rootdir
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; TODO: init cluster number
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RET
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; Set logical sector number
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; IN DX sector number
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SETLSEC:
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PUSH AX
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PUSH CX
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PUSH DX
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XOR AX, AX
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XCHG AX, DX
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DIV WORD [DISKBPB+BPB_SPT]
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MOV CX, AX
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CALL SETTRK
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MOV CX, DX
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INC CX
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CALL SETSEC
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POP DX
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POP CX
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POP AX
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RET
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; OUT DX number of sectors by all FATs
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FATSIZE:
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PUSH AX
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MOV DL, BYTE [DISKBPB+BPB_FN]
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MOV AL, BYTE [DISKBPB+BPB_SF]
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MUL DL
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XCHG AX, DX
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POP AX
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RET:
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RET
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; IN CL drive num, 1=A, 2=B, 3=C
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LOADBPB:
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CMP BYTE [DISKDRV], CL
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JE RET
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PUSH CX
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DEC CL
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CALL SELDSK
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; first track
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MOV CX, 0
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CALL SETTRK
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; first sector
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MOV CX, 1
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CALL SETSEC
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; into default diskbuf
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MOV CX, DISKBUF
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CALL SETDMA
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POP CX
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CALL READ
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JC DISKRST
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; copy BPB
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PUSH CX
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PUSH SI
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PUSH DI
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MOV CX, 21
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MOV SI, DISKBUF+0x0B
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MOV DI, DISKBPB
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REP MOVSB
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POP DI
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POP SI
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POP CX
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; store drive number
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MOV BYTE [DISKDRV], CL
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RET
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@ -1,85 +0,0 @@
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; print a word
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; in: ax
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print16:
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xchg ah,al
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call print8
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xchg ah,al
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; print a byte
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; in: al
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print8:
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push ax ; avoid destroying ah
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push bx
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xor bx, bx
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aam 16 ; high nibble moved into ah, low nibble into al
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add ax, 0x3030
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push ax
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xchg al, ah
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call .nib
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pop ax
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call .nib
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pop bx
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pop ax
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ret
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.nib:
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cmp al, 0x3a
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jl .out
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add al, 0x07
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.out:
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mov dl, al
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call CONOUT
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ret
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dump:
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push ax
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push cx
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push dx
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push bx
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mov dl, 0x0A
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call CONOUT
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mov dl, 0x0D
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call CONOUT
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mov cx, 4
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.loop_line:
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push cx
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push bx
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mov ax, bx
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call print16
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mov dl, ':'
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call CONOUT
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mov dl, ' '
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call CONOUT
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mov cx, 0x8
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.loop_bin:
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mov ax, [bx]
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xchg al, ah
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inc bx
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inc bx
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call print16
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mov dl, ' '
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call CONOUT
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loop .loop_bin
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pop bx
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mov cx, 0x10
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.loop_ascii:
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mov dl, '.'
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cmp byte [bx], 0x20
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jc .print
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cmp byte [bx], 0x80
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jnc .print
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mov dl, [bx]
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.print:
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inc bx
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call CONOUT
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loop .loop_ascii
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pop cx
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mov dl, 0x0A
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call CONOUT
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mov dl, 0x0D
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call CONOUT
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loop .loop_line
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pop bx
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pop dx
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pop cx
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pop ax
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ret
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218
bios/8086.asm
218
bios/8086.asm
@ -1,218 +0,0 @@
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ORG BIOS
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CPU 8086
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DISKCX: EQU 0x8
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DISKDX: EQU 0xA
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DISKBX: EQU 0xC
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JMP NEAR BOOT
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JMP NEAR WBOOT
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JMP NEAR CONST
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JMP NEAR CONIN
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JMP NEAR CONOUT
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JMP NEAR LIST
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JMP NEAR PUNCH
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JMP NEAR READER
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JMP NEAR HOME
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JMP NEAR SELDSK
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JMP NEAR SETTRK
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JMP NEAR SETSEC
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JMP NEAR SETDMA
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JMP NEAR READ
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JMP NEAR WRITE
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JMP NEAR LISTST
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BOOT:
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MOV AL, 0x86
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CALL MSG
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DB "BIOS", 0
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WBOOT:
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XOR CX, CX
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JMP BDOS
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RET
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; CHAR I/O
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CONST:
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MOV AH, 1
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INT 0x16
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JZ .END
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MOV AL, 0xFF
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RET
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.END:
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XOR AL, AL
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RET
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CONIN:
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XOR AX, AX
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INT 0x16
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TEST AL, AL
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JZ CONIN
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RET
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MSG:
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POP SI
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.LOOP:
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MOV DL, BYTE [SI]
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INC SI
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TEST DL, DL
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JZ .END
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CALL CONOUT
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JMP .LOOP
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.END:
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MOV DL, 0x20
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CALL CONOUT
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CALL PRINTAL
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MOV DL, 0x0A
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CALL CONOUT
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MOV DL, 0x0D
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CALL CONOUT
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PUSH SI
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RET
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PRINTAL:
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PUSH AX
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PUSH DX
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AAM 16
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MOV DL, AH
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CALL PRINTNIB
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MOV DL, AL
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CALL PRINTNIB
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POP DX
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POP AX
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RET
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PRINTNIB:
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ADD DL, 0x30
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CMP DL, 0x3a
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JL CONOUT
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ADD DL, 0x07
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CONOUT:
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PUSH AX
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PUSH BX
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MOV AH, 0x0E
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MOV AL, DL
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XOR BX, BX
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INT 0x10
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POP BX
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POP AX
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RET
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LIST:
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PUSH DX
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XOR AH, AH
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MOV AL, DL
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INT 0x17
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POP DX
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RET
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LISTST:
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STC
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RET
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PUNCH:
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STC
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RET
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READER:
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STC
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RET
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; DISK I/O
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HOME:
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MOV WORD [DISKCX], 0x0001
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MOV BYTE [DISKDX+1], 0x00
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RET
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SELDSK:
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MOV BYTE [DISKDX], CL
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XOR BX, BX
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RET
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SETTRK:
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PUSH CX
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PUSH DX
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MOV DX, CX
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; CH for headnum, CL for SAL
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MOV CX, 0x0006
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; Take off LSB as head number
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XOR CH, CH
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RCR DX, 1
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RCL CH, 1
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MOV BYTE [DISKDX+1], CH
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; DX is sector number now
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; Shift into format for int13
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; DX ------9876543210
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SAL DX, CL
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; DX 9876543210------
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ROL DX, 1
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ROL DX, 1
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; DX 76543210------98
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SAL DL, CL
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; DX 7654321098------
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AND WORD [DISKCX], 0x003F
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OR WORD [DISKCX], DX
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POP DX
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POP CX
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RET
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SETSEC:
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AND WORD [DISKCX], 0xFFC0
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OR BYTE [DISKCX], CL
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RET
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SETDMA:
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MOV WORD [DISKBX], CX
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RET
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READ:
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PUSH CX
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PUSH DX
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PUSH BX
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MOV AX, 0x0201
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MOV CX, [DISKCX]
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MOV DX, [DISKDX]
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MOV BX, [DISKBX]
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INT 0x13
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XCHG AH, AL
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POP BX
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POP DX
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POP CX
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JC DISKERR
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RET
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WRITE:
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PUSH CX
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PUSH DX
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PUSH BX
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MOV AX, 0x0301
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MOV CX, [DISKCX]
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MOV DX, [DISKDX]
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MOV BX, [DISKBX]
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INT 0x13
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XCHG AH, AL
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POP BX
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POP DX
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POP CX
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JC DISKERR
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RET
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DISKERR:
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PUSHF
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PUSH SI
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CALL MSG
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DB "DISKERR", 0
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POP SI
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POPF
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RET
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241
boot/fat.asm
241
boot/fat.asm
@ -1,241 +0,0 @@
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; Memory layout:
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%define segment 0x00100
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%define self (0x7C00-(segment<<4)) ; 1 sector
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%define fattab (self+0x200) ; variable size
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%define rootdir 0x00100 ; variable size
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%define prog 0x0F000 ; 4K at the end for OS
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org self
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jmp short init
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cluster_offset:
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dw 0
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times (0x0B - ($-$$)) db 0
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fdc:
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.ss:
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dw 0x200 ; sector size
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.sc:
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db 2 ; sectors per cluster
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.rsc:
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dw 1 ; reserved sector count
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.fn:
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db 2 ; number of file allocation tables
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.rde:
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dw 0x70 ; number of root directory entries
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.ts:
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dw 720 ; total number of sectors
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.mi: ; medium identifier
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db 0xFD ; 5.25-inch Double sided, 40 tracks per side, 9 sectors per track (360 KB)
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.sf: ; sectors per fat
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dw 2
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.spt:
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dw 9 ; sectors per track
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.nos:
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dw 2 ; number of sides (heads)
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.po:
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dd 0 ; partition offset (in LBA blocks)
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.lrgts:
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dd 0
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.drv:
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db 0 ; drive number
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db 0
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db 0x29 ; efdc signature
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.vid:
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dd 0 ; volume id
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.vlabel:
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db "2B"
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times (54 - ($-$$)) db " "
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.fstype:
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db "FAT12"
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times (62 - ($-$$)) db " "
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; mformat keeps writing until here
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; if we place init earlier, code gets overwritten
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times (62 - ($-$$)) nop
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init:
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cli
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jmp segment:main
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main:
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; Stack grows down from 64k
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mov ax, cs
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mov ss, ax
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mov sp, prog
|
||||
mov ds, ax
|
||||
mov es, ax
|
||||
|
||||
mov [fdc.drv], dl ; save drive number in fd
|
||||
sti
|
||||
|
||||
; load fat table into memory
|
||||
mov ax, [fdc.rsc]
|
||||
mov cx, [fdc.sf]
|
||||
xor dx, dx
|
||||
mov bx, fattab
|
||||
call load_sectors
|
||||
|
||||
; calculate length of rootdir
|
||||
mov ax, [fdc.rde]
|
||||
mov cl, 4
|
||||
shr ax, cl ; 32 bytes per entry
|
||||
mov cx, ax
|
||||
|
||||
; load root dir
|
||||
xor dx, dx
|
||||
mov ax, [fdc.sf]
|
||||
mul byte [fdc.fn]
|
||||
add ax, [fdc.rsc]
|
||||
mov bx, rootdir
|
||||
call load_sectors
|
||||
|
||||
; remember where we left off
|
||||
; clusters start after rootdir
|
||||
mov [cluster_offset], ax
|
||||
|
||||
; Load kernel
|
||||
mov bx, prog
|
||||
mov ax, kernel_name
|
||||
call load_file
|
||||
mov bp, 0x3332
|
||||
jc error
|
||||
|
||||
mov dl, [fdc.drv]
|
||||
|
||||
; jump into kernel
|
||||
jmp segment:prog
|
||||
|
||||
; Load a file into memory
|
||||
; IN AX pointer to 8.3 filename
|
||||
; ES:BX pointer to target area
|
||||
; OUT CF flag set if error
|
||||
; DI file size in bytes (<64K)
|
||||
load_file:
|
||||
mov si, rootdir
|
||||
mov cx, [fdc.rde]
|
||||
.search:
|
||||
push cx
|
||||
push si
|
||||
mov di, ax
|
||||
mov cx, 11
|
||||
repe cmpsb
|
||||
pop si
|
||||
pop cx
|
||||
je .read
|
||||
add si, 0x20
|
||||
loop .search
|
||||
xor di, di
|
||||
stc
|
||||
ret
|
||||
.read:
|
||||
mov ax, [si+0x1A]
|
||||
mov di, [si+0x1C]
|
||||
jmp read_clusters
|
||||
|
||||
; Read the file given by cluster number
|
||||
; into the target program area
|
||||
; in ax cluster number
|
||||
read_clusters:
|
||||
; read cluster into area for target file
|
||||
push ax
|
||||
sub ax, 2
|
||||
mul BYTE [fdc.sc]
|
||||
add ax, [cluster_offset]
|
||||
xor dx, dx
|
||||
mov cx, [fdc.sc]
|
||||
xor ch, ch
|
||||
call load_sectors
|
||||
pop ax
|
||||
|
||||
; calculate index in FAT
|
||||
mov si, ax
|
||||
shr si, 1
|
||||
add si, ax
|
||||
add si, fattab
|
||||
|
||||
; load entry from FAT, truncate to 12 bit
|
||||
mov dx, [si]
|
||||
test ax, 1
|
||||
jz .noshift
|
||||
mov cl, 4
|
||||
shr dx, 4
|
||||
.noshift:
|
||||
mov ax, dx
|
||||
|
||||
and ax, 0x0FFF
|
||||
cmp ax, 0x0FF8
|
||||
jc read_clusters
|
||||
|
||||
ret
|
||||
|
||||
; Read sectors from disk
|
||||
; Does not return on error
|
||||
; ax and bx will be incremented, cx decremented
|
||||
; in dx:ax sector number
|
||||
; es:bx buffer
|
||||
; cx number of sectors to read
|
||||
; out dx:ax next sector to read
|
||||
; es:bx next free buffer
|
||||
; cx zero
|
||||
load_sectors:
|
||||
; fail instantly if reading sectors > 16 bit
|
||||
test dx, dx
|
||||
mov bp, 0x3330
|
||||
jnz error
|
||||
|
||||
.loop:
|
||||
push ax
|
||||
push cx
|
||||
push dx
|
||||
|
||||
; add partition offset (required for HDD)
|
||||
add ax, [fdc.po]
|
||||
adc dx, [fdc.po+2]
|
||||
|
||||
; calculate CHS data
|
||||
div word [cs:fdc.spt] ; ax:temp = (lba / spt)
|
||||
inc dx ; dx:sector = (lba % spt) + 1
|
||||
mov cl, dl ; sector number
|
||||
xor dx, dx
|
||||
div word [cs:fdc.nos] ; ax:cylinder = (tmp / heads)
|
||||
; dx:head = (tmp % heads)
|
||||
mov ch, al ; cylinder number
|
||||
mov dh, dl ; head number
|
||||
mov dl, [cs:fdc.drv] ; driver number
|
||||
mov ax, 0x0201 ; ah=0x02 al=0x01
|
||||
int 0x13
|
||||
mov bp, 0x3331
|
||||
jc error
|
||||
|
||||
pop dx
|
||||
pop cx
|
||||
pop ax
|
||||
|
||||
; count up for next sector
|
||||
add bx, 0x0200
|
||||
inc ax
|
||||
|
||||
loop .loop
|
||||
ret
|
||||
|
||||
error:
|
||||
mov ax, bp
|
||||
mov ah, 0x0e
|
||||
mov bx, 7
|
||||
int 0x10
|
||||
mov al, 0x21
|
||||
int 0x10
|
||||
xor ax, ax
|
||||
int 0x16
|
||||
int 0x19
|
||||
|
||||
kernel_name:
|
||||
db "BDOS BIN"
|
||||
|
||||
times (0x1FE - ($-$$)) db 0
|
||||
|
||||
dw 0xAA55
|
||||
136
boot/mbr.asm
136
boot/mbr.asm
@ -1,136 +0,0 @@
|
||||
; Memory layout:
|
||||
%define self 0x00600 ; 1 sector
|
||||
%define prog 0x07C00 ; 1 sector
|
||||
|
||||
; FDC fields in VBR
|
||||
%define spt (prog + 0x18)
|
||||
%define nos (prog + 0x1A)
|
||||
%define po (prog + 0x1C)
|
||||
|
||||
org self
|
||||
cpu 8086
|
||||
|
||||
init:
|
||||
cli
|
||||
|
||||
; Stack grows down from PSP + 64k
|
||||
xor ax, ax
|
||||
mov ss, ax
|
||||
mov sp, ax
|
||||
|
||||
push dx
|
||||
|
||||
; Relocate from [prog] to [self]
|
||||
mov ds, ax
|
||||
mov es, ax
|
||||
mov si, prog
|
||||
mov di, self
|
||||
mov cx, 0x100
|
||||
rep movsw
|
||||
|
||||
jmp 0:main
|
||||
|
||||
main:
|
||||
mov bp, 0x3335
|
||||
mov si, part1
|
||||
mov cx, 4
|
||||
.loop:
|
||||
test BYTE [si], 0x80
|
||||
jnz loadpart
|
||||
add si, 0x10
|
||||
loop .loop
|
||||
jmp error
|
||||
|
||||
loadpart:
|
||||
; transfer starting address into DAP
|
||||
push si
|
||||
add si, 0x08
|
||||
mov di, dap.blocknum
|
||||
movsw
|
||||
movsw
|
||||
pop si
|
||||
|
||||
; load sector
|
||||
push si
|
||||
mov si, dap
|
||||
mov bp, 0x3336
|
||||
mov ah, 0x42
|
||||
stc
|
||||
int 0x13
|
||||
jc error
|
||||
pop si
|
||||
|
||||
cmp BYTE [si+4], 0x01
|
||||
jne jump
|
||||
|
||||
adjust:
|
||||
push dx
|
||||
|
||||
mov bp, 0x3337
|
||||
mov ah, 0x08
|
||||
stc
|
||||
int 0x13
|
||||
jc error
|
||||
|
||||
; update sectors per track
|
||||
xor ax, ax
|
||||
mov al, cl
|
||||
mov [spt], ax
|
||||
|
||||
; update number of sides
|
||||
xor ax, ax
|
||||
mov al, dh
|
||||
mov [nos], ax
|
||||
|
||||
; update partition offset
|
||||
push si
|
||||
add si, 0x08
|
||||
mov di, po
|
||||
movsw
|
||||
movsw
|
||||
pop si
|
||||
|
||||
pop dx
|
||||
|
||||
jump:
|
||||
jmp 0:prog
|
||||
|
||||
error:
|
||||
mov ax, bp
|
||||
mov ah, 0x0e
|
||||
mov bx, 7
|
||||
int 0x10
|
||||
mov al, 0x21
|
||||
int 0x10
|
||||
xor ax, ax
|
||||
int 0x16
|
||||
int 0x19
|
||||
|
||||
dap:
|
||||
.size:
|
||||
db 0
|
||||
db 0
|
||||
.count:
|
||||
dw 1
|
||||
.buffer:
|
||||
dw prog
|
||||
dw 0
|
||||
.blocknum:
|
||||
dq 0
|
||||
|
||||
times (0x1BE - ($-$$)) db 0
|
||||
part1:
|
||||
db 0x80
|
||||
.chs_start:
|
||||
db 0xFF, 0xFF, 0xFF
|
||||
.type:
|
||||
db 0x01
|
||||
.chs_end:
|
||||
db 0xFF, 0xFF, 0xFF
|
||||
.begin:
|
||||
dd 1
|
||||
.end:
|
||||
dd (FLOPPY * 2)
|
||||
|
||||
times (0x1FE - ($-$$)) db 0
|
||||
dw 0xAA55
|
||||
@ -1,90 +0,0 @@
|
||||
org 0x7c00
|
||||
|
||||
xor ax, ax
|
||||
mov ds, ax
|
||||
mov es, ax
|
||||
mov ss, ax
|
||||
mov sp, 0x7c00
|
||||
jmp 0:start
|
||||
|
||||
getc:
|
||||
mov ah, 0x02
|
||||
mov dx, 0x0000
|
||||
int 0x14
|
||||
test ah, 0x80
|
||||
jnz getc
|
||||
ret
|
||||
|
||||
putc:
|
||||
mov ah, 0x01
|
||||
mov dx, 0x0000
|
||||
int 0x14
|
||||
ret
|
||||
|
||||
init_port:
|
||||
mov ah, 0x00
|
||||
mov al, 0b11100011
|
||||
mov dx, 0x0000
|
||||
int 0x14
|
||||
ret
|
||||
|
||||
dump:
|
||||
mov si, 0x500
|
||||
mov cx, di
|
||||
sub cx, si
|
||||
.loop:
|
||||
lodsb
|
||||
call print8
|
||||
loop .loop
|
||||
mov al, 0x0A
|
||||
call putc
|
||||
mov al, 0x0D
|
||||
call putc
|
||||
ret
|
||||
|
||||
line_reset:
|
||||
cmp di, 0x500
|
||||
je .reset
|
||||
call line_process
|
||||
.reset:
|
||||
mov di, 0x500
|
||||
xor bp, bp
|
||||
jmp mainloop
|
||||
|
||||
line_process:
|
||||
call dump
|
||||
ret
|
||||
|
||||
start:
|
||||
call init_port
|
||||
mov di, 0x500
|
||||
jmp line_reset
|
||||
|
||||
mainloop:
|
||||
call getc
|
||||
cmp al, ':'
|
||||
je line_reset
|
||||
cmp al, 0x20
|
||||
jb line_reset
|
||||
sub al, 0x30
|
||||
cmp al, 9
|
||||
jbe .noadjust
|
||||
sub al, 7
|
||||
.noadjust:
|
||||
test bp, bp
|
||||
jnz .secondnib
|
||||
mov cl, 4
|
||||
shl al, cl
|
||||
mov [di], al
|
||||
not bp
|
||||
jmp mainloop
|
||||
.secondnib:
|
||||
or [di], al
|
||||
inc di
|
||||
not bp
|
||||
jmp mainloop
|
||||
|
||||
%include "print.asm"
|
||||
|
||||
times 510-($-$$) db 0x00
|
||||
db 0x55,0xaa
|
||||
@ -1,21 +0,0 @@
|
||||
org 0x100
|
||||
|
||||
jmp start
|
||||
|
||||
%include "fcbparse.asm"
|
||||
|
||||
fcb_asm:
|
||||
times 36 db 0
|
||||
|
||||
fcb_bin:
|
||||
times 36 db 0
|
||||
|
||||
fcb_lst:
|
||||
times 36 db 0
|
||||
|
||||
start:
|
||||
mov si, 0x81
|
||||
mov bx, fcb_asm
|
||||
mov ax, 0x1234
|
||||
call fcb_parse
|
||||
ret
|
||||
@ -1,17 +0,0 @@
|
||||
org 0x0100
|
||||
|
||||
main:
|
||||
mov si, hello
|
||||
.loop:
|
||||
lodsb
|
||||
test al, al
|
||||
jz .ret
|
||||
mov dl, al
|
||||
mov cl, 0x02
|
||||
call 5
|
||||
jmp .loop
|
||||
.ret:
|
||||
ret
|
||||
|
||||
hello:
|
||||
db "Hello!", 0x0A, 0x0D, 0
|
||||
17
hdr/bios.asm
17
hdr/bios.asm
@ -1,17 +0,0 @@
|
||||
; Labels for BIOS entry points
|
||||
BOOT: EQU (BIOS+0)
|
||||
WBOOT: EQU (BIOS+3)
|
||||
CONST: EQU (BIOS+6)
|
||||
CONIN: EQU (BIOS+9)
|
||||
CONOUT: EQU (BIOS+12)
|
||||
LIST: EQU (BIOS+15)
|
||||
PUNCH: EQU (BIOS+18)
|
||||
READER: EQU (BIOS+21)
|
||||
HOME: EQU (BIOS+24)
|
||||
SELDSK: EQU (BIOS+27)
|
||||
SETTRK: EQU (BIOS+30)
|
||||
SETSEC: EQU (BIOS+33)
|
||||
SETDMA: EQU (BIOS+36)
|
||||
READ: EQU (BIOS+39)
|
||||
WRITE: EQU (BIOS+42)
|
||||
LISTST: EQU (BIOS+45)
|
||||
12
hdr/bpb.asm
12
hdr/bpb.asm
@ -1,12 +0,0 @@
|
||||
; BPB from first sector on FAT fs, starting 0x0B
|
||||
BPB_SS: EQU 0 ; WORD sector size
|
||||
BPB_SC: EQU 2 ; BYTE sectors per cluster
|
||||
BPB_RSC: EQU 3 ; WORD reserved sector count
|
||||
BPB_FN: EQU 5 ; BYTE number of FATs
|
||||
BPB_RDE: EQU 6 ; WORD number of root directory entries
|
||||
BPB_TS: EQU 8 ; WORD total number of sectors
|
||||
BPB_MI: EQU 10 ; BYTE medium identifier
|
||||
BPB_SF: EQU 11 ; WORD sectors per FAT
|
||||
BPB_SPT: EQU 13 ; WORD sectors per track
|
||||
BPB_NOS: EQU 15 ; WORD number of sides/heads
|
||||
BPB_PO: EQU 17 ; DWORD partition offset
|
||||
10
hdr/fcb.asm
10
hdr/fcb.asm
@ -1,10 +0,0 @@
|
||||
; File control block
|
||||
FCB_DRV: EQU 0 ; BYTE 0=A: 1=B: 2=C: ...
|
||||
FCB_NAM: EQU 1 ; 8 BYTES, space padded
|
||||
FCB_EXT: EQU 9 ; 3 BYTES, space padded
|
||||
FCB_TYP: EQU 12 ; BYTE FCB type
|
||||
; TYP=1: regular file
|
||||
FCB_BLK: EQU 13 ; current 128b block in sector
|
||||
FCB_CLU: EQU 14 ; current sector
|
||||
FCB_LFT: EQU 16 ; bytes left to read in current file
|
||||
FCB_END: EQU 20 ; FCB length
|
||||
@ -1,65 +0,0 @@
|
||||
%define mcb_first 0x5F
|
||||
|
||||
; This alloc uses an MCB-like list always starting at a fixed offset.
|
||||
; Boot components may use it to allocate space during early boot.
|
||||
; The list ends with the most recently allocated arena at its end,
|
||||
; contrary to how the MCBs work on DOS.
|
||||
|
||||
; Memory Layout:
|
||||
; 0000 Interrupt table
|
||||
; 0400 BIOS data area
|
||||
; 05F0 16 bytes Arena header 1
|
||||
; 0600 BX paragraphs Arena 1
|
||||
; .... 16 bytes Arena header 2
|
||||
; .... BX paragraphs Arena 2
|
||||
; ...
|
||||
; .... 16 bytes Arena header n
|
||||
; .... BX paragraphs Arena n
|
||||
; Unmanaged memory
|
||||
|
||||
; Take note that this mechanism works differently than under DOS -
|
||||
; but this one is optimized for fast and small alloc.
|
||||
|
||||
; Typical usecases:
|
||||
; - Diskette Parameter Table (See interrupt 1Eh)
|
||||
; - Partition table
|
||||
; - Boot sector relocations
|
||||
; - Boot sector data (FAT table, rootdir)
|
||||
|
||||
; Allocate paragraphs in unmanaged memory
|
||||
; IN BX requested memory in paragraphs
|
||||
; OUT AX output segment
|
||||
early_alloc:
|
||||
push ds
|
||||
push bx
|
||||
push si
|
||||
; si is used as zero register
|
||||
; this allows the opcodes to use a byte as disp instead of word
|
||||
xor si, si
|
||||
mov ax, mcb_first
|
||||
.next:
|
||||
mov ds, ax
|
||||
inc ax
|
||||
; DS is seg of arena header
|
||||
; AX is seg of arena
|
||||
cmp BYTE [si], 0x4D
|
||||
jne .here
|
||||
add ax, WORD [si+3]
|
||||
jmp .next
|
||||
.here:
|
||||
; mark as item
|
||||
mov BYTE [si], 0x4D
|
||||
; write segment length in paragraphs
|
||||
mov WORD [si+3], bx
|
||||
; if allocation is higher than CS, then we are in managed memory
|
||||
; set ourself as owner then, otherwise use dummy value 8
|
||||
mov bx, cs
|
||||
cmp ax, bx ; CF = CS in unmanaged memory
|
||||
jnc .setup_owner
|
||||
mov bx, 8
|
||||
.setup_owner:
|
||||
mov WORD [si+1], bx
|
||||
pop si
|
||||
pop bx
|
||||
pop ds
|
||||
ret
|
||||
@ -1,46 +0,0 @@
|
||||
; Parse ASCIIZ string into FCB
|
||||
; IN SI ptr to filename
|
||||
; BX ptr to FCB
|
||||
fcb_parse:
|
||||
push di
|
||||
push ax
|
||||
mov di, bx
|
||||
xor ax, ax
|
||||
stosb
|
||||
.cleanout:
|
||||
push di
|
||||
mov cx, 0x0A
|
||||
mov al, 0x20
|
||||
rep stosb
|
||||
pop di
|
||||
.base_loop:
|
||||
call .read
|
||||
cmp al, 0x2E
|
||||
je .ext_start
|
||||
cmp al, 0x20
|
||||
je .ret
|
||||
stosb
|
||||
jmp .base_loop
|
||||
.ext_start:
|
||||
mov di, bx
|
||||
add di, 9
|
||||
.ext_loop:
|
||||
call .read
|
||||
cmp al, 0x20
|
||||
je .ret
|
||||
stosb
|
||||
jmp .ext_loop
|
||||
.read:
|
||||
lodsb
|
||||
test al, al
|
||||
jz .eret
|
||||
cmp al, 0x0D
|
||||
je .eret
|
||||
ret
|
||||
.eret:
|
||||
dec si
|
||||
pop ax
|
||||
.ret:
|
||||
pop ax
|
||||
pop di
|
||||
ret
|
||||
14
lib/fdc.asm
14
lib/fdc.asm
@ -1,14 +0,0 @@
|
||||
; FDC Descriptor / BIOS parameter block
|
||||
fdc_ss: equ 0x0B ; WORD sector size
|
||||
fdc_sc: equ 0x0D ; BYTE sectors per cluster
|
||||
fdc_rsc: equ 0x0E ; WORD reserved sectors
|
||||
fdc_fn: equ 0x10 ; BYTE FAT tables
|
||||
fdc_rde: equ 0x11 ; WORD root directory entries
|
||||
fdc_ts: equ 0x13 ; WORD total sector count
|
||||
; 0 if >65535, use lrgts then
|
||||
fdc_mi: equ 0x15 ; BYTE media descriptor byte
|
||||
fdc_sf: equ 0x16 ; WORD sectors per FAT
|
||||
fdc_spt: equ 0x18 ; WORD sectors per track
|
||||
fdc_nos: equ 0x1A ; WORD sides/heads
|
||||
fdc_po: equ 0x1C ; DWORD partition offset
|
||||
fdc_lrgts: equ 0x20 ; DWORD large sector count
|
||||
15
lib/log2.asm
15
lib/log2.asm
@ -1,15 +0,0 @@
|
||||
; Calculate dual logarithm (int)
|
||||
; IN AX number
|
||||
; OUT AX dual logarithm
|
||||
log2:
|
||||
push cx
|
||||
mov cx, 15
|
||||
.loop:
|
||||
rcl ax, 1
|
||||
jc .ret
|
||||
loop .loop
|
||||
.ret:
|
||||
cmc
|
||||
mov ax, cx
|
||||
pop cx
|
||||
ret
|
||||
124
lib/nasmcomp.asm
124
lib/nasmcomp.asm
@ -1,124 +0,0 @@
|
||||
; Pseudo-Instruction: fill bytes until offset
|
||||
%macro pad 1.nolist
|
||||
times (%1 - ($-$$)) nop
|
||||
%endmacro
|
||||
|
||||
; REGISTERS
|
||||
%define a al
|
||||
%define b ch
|
||||
%define c cl
|
||||
%define d dh
|
||||
%define e dl
|
||||
%define h bh
|
||||
%define l bl
|
||||
%define m byte [bx]
|
||||
|
||||
; REGISTER PAIRS
|
||||
%define bc cx
|
||||
%define de dx
|
||||
%define hl bx
|
||||
|
||||
; INSTRUCTIONS
|
||||
; data movement
|
||||
; 'mov' can stay literal
|
||||
%define mvi mov
|
||||
%define lxi mov
|
||||
%macro lda 1
|
||||
mov al, byte [%1]
|
||||
%endmacro
|
||||
%macro sta 1
|
||||
mov byte [%1], al
|
||||
%endmacro
|
||||
%macro lhld 1
|
||||
mov bx, word [%1]
|
||||
%endmacro
|
||||
%macro shld 1
|
||||
mov word [%1], bx
|
||||
%endmacro
|
||||
%macro ldax 1
|
||||
mov al, byte [%1]
|
||||
%endmacro
|
||||
%macro stax 1
|
||||
mov byte [%1], al
|
||||
%endmacro
|
||||
%macro xchg 1
|
||||
xchg dx, bx
|
||||
%endmacro
|
||||
; addition
|
||||
%macro add 1
|
||||
add al, %1
|
||||
%endmacro
|
||||
%macro adi 1
|
||||
add al, %1
|
||||
%endmacro
|
||||
%macro adc 1
|
||||
adc al, %1
|
||||
%endmacro
|
||||
%macro aci 1
|
||||
adc al, %1
|
||||
%endmacro
|
||||
; subtraction
|
||||
%macro sub 1
|
||||
sub al, %1
|
||||
%endmacro
|
||||
%macro sui 1
|
||||
sub al, %1
|
||||
%endmacro
|
||||
%macro sbb 1
|
||||
sub al, %1
|
||||
%endmacro
|
||||
%macro sbi 1
|
||||
sub al, %1
|
||||
%endmacro
|
||||
; increment / decrement
|
||||
%define inr inc
|
||||
%define dcr dec
|
||||
%define inx inc
|
||||
%define dcx dec
|
||||
; pointer arithmetic
|
||||
%macro dad 1
|
||||
add bx, %1
|
||||
%endmacro
|
||||
; 'daa' stays literal
|
||||
|
||||
;ANA S 10100SSS ZSCPA AND register with A
|
||||
;ANI # 11100110 db ZSPCA AND immediate with A
|
||||
;ORA S 10110SSS ZSPCA OR register with A
|
||||
;ORI # 11110110 ZSPCA OR immediate with A
|
||||
;XRA S 10101SSS ZSPCA ExclusiveOR register with A
|
||||
;XRI # 11101110 db ZSPCA ExclusiveOR immediate with A
|
||||
|
||||
;CMP S 10111SSS ZSPCA Compare register with A
|
||||
;CPI # 11111110 ZSPCA Compare immediate with A
|
||||
|
||||
;RLC 00000111 C Rotate A left
|
||||
;RRC 00001111 C Rotate A right
|
||||
;RAL 00010111 C Rotate A left through carry
|
||||
;RAR 00011111 C Rotate A right through carry
|
||||
;CMA 00101111 - Compliment A
|
||||
;CMC 00111111 C Compliment Carry flag
|
||||
;STC 00110111 C Set Carry flag
|
||||
;JMP a 11000011 lb hb - Unconditional jump
|
||||
;Jccc a 11CCC010 lb hb - Conditional jump
|
||||
;CALL a 11001101 lb hb - Unconditional subroutine call
|
||||
;Cccc a 11CCC100 lb hb - Conditional subroutine call
|
||||
;RET 11001001 - Unconditional return from subroutine
|
||||
;Rccc 11CCC000 - Conditional return from subroutine
|
||||
;RST n 11NNN111 - Restart (Call n*8)
|
||||
;PCHL 11101001 - Jump to address in H:L
|
||||
;PUSH RP 11RP0101 *2 - Push register pair on the stack
|
||||
;POP RP 11RP0001 *2 *2 Pop register pair from the stack
|
||||
;XTHL 11100011 - Swap H:L with top word on stack
|
||||
;SPHL 11111001 - Set SP to content of H:L
|
||||
;IN p 11011011 pa - Read input port into A
|
||||
;OUT p 11010011 pa - Write A to output port
|
||||
;EI 11111011 - Enable interrupts
|
||||
;DI 11110011 - Disable interrupts
|
||||
;HLT 01110110 - Halt processor
|
||||
;NOP 00000000 - No operation
|
||||
|
||||
%macro cnz 1
|
||||
jz %%skip
|
||||
call near %1
|
||||
%%skip:
|
||||
%endmacro
|
||||
142
lib/opcode80.asm
142
lib/opcode80.asm
@ -1,142 +0,0 @@
|
||||
; BYTE name length
|
||||
; n BYTES name
|
||||
; BYTE opcode template (variable parts zero)
|
||||
;
|
||||
; BYTE operand 1
|
||||
; BYTE operand 2
|
||||
|
||||
; operand types:
|
||||
; 0x00 none
|
||||
; 0x1n reg8, opcode |= (reg8 << n)
|
||||
; 0x2n reg16, opcode |= (reg8 << n)
|
||||
; 0x3n reg16b, opcode |= (reg8 << n)
|
||||
; 0x7n 3-bit number, opcode |= (num << n)
|
||||
; 0x80 imm8, encoded as extra byte
|
||||
; 0x81 imm16, encoded as extra word
|
||||
|
||||
registers:
|
||||
.reg8:
|
||||
db "B", 0
|
||||
db "C", 0
|
||||
db "D", 0
|
||||
db "E", 0
|
||||
db "H", 0
|
||||
db "L", 0
|
||||
db "M", 0
|
||||
db 0
|
||||
.reg16:
|
||||
db "BC", 0
|
||||
db "DE", 0
|
||||
db "HL", 0
|
||||
db "SP", 0
|
||||
db 0
|
||||
.reg16b:
|
||||
db "BC", 0
|
||||
db "DE", 0
|
||||
db "HL", 0
|
||||
db "AF", 0
|
||||
db 0
|
||||
.end:
|
||||
db 0
|
||||
|
||||
opcodes:
|
||||
; Data movement
|
||||
db 3, "MOV", 0b01000000, 0x13, 0x10
|
||||
db 3, "MVI", 0b00000110, 0x13, 0x80
|
||||
db 3, "LXI", 0b00000001, 0x24, 0x81
|
||||
db 3, "LDA", 0b00111010, 0x81, 0x00
|
||||
db 3, "STA", 0b00110010, 0x81, 0x00
|
||||
db 4, "LHLD", 0b00101010, 0x81, 0x00
|
||||
db 4, "SHLD", 0b00100010, 0x81, 0x00
|
||||
db 4, "LDAX", 0b00001010, 0x24, 0x00
|
||||
db 4, "STAX", 0b00000010, 0x24, 0x00
|
||||
db 4, "XCHG", 0b11101011, 0x00, 0x00
|
||||
|
||||
; Addition / Subtraction
|
||||
db 3, "ADD", 0b10000000, 0x10, 0x00
|
||||
db 3, "ADI", 0b11000110, 0x80, 0x00
|
||||
db 3, "ADC", 0b10001000, 0x10, 0x00
|
||||
db 3, "ACI", 0b11001110, 0x80, 0x00
|
||||
db 3, "SUB", 0b10010000, 0x10, 0x00
|
||||
db 3, "SUI", 0b11010110, 0x80, 0x00
|
||||
db 3, "SBB", 0b10011000, 0x10, 0x00
|
||||
db 3, "SBI", 0b11011110, 0x80, 0x00
|
||||
db 3, "INR", 0b00000100, 0x13, 0x00
|
||||
db 3, "DCR", 0b00000101, 0x13, 0x00
|
||||
db 3, "INX", 0b00000011, 0x24, 0x00
|
||||
db 3, "DCX", 0b00001011, 0x24, 0x00
|
||||
db 3, "DAD", 0b00001001, 0x24, 0x00
|
||||
|
||||
; BCD
|
||||
db 3, "DAA", 0b00100111, 0x00, 0x00
|
||||
|
||||
; Bitwise operations
|
||||
db 3, "ANA", 0b10100000, 0x10, 0x00
|
||||
db 3, "ANI", 0b11100110, 0x80, 0x00
|
||||
db 3, "ORA", 0b10110000, 0x10, 0x00
|
||||
db 3, "ORI", 0b11110110, 0x80, 0x00
|
||||
db 3, "XRA", 0b10101000, 0x10, 0x00
|
||||
db 3, "XRI", 0b11101110, 0x80, 0x00
|
||||
db 3, "CMP", 0b10111000, 0x10, 0x00
|
||||
db 3, "CPI", 0b11111110, 0x80, 0x00
|
||||
|
||||
; Rotate
|
||||
db 3, "RLC", 0b00000111, 0x00, 0x00
|
||||
db 3, "RRC", 0b00001111, 0x00, 0x00
|
||||
db 3, "RAL", 0b00010111, 0x00, 0x00
|
||||
db 3, "RAR", 0b00011111, 0x00, 0x00
|
||||
|
||||
; Complement
|
||||
db 3, "CMA", 0b00101111, 0x00, 0x00
|
||||
db 3, "CMC", 0b00111111, 0x00, 0x00
|
||||
db 3, "STC", 0b00110111, 0x00, 0x00
|
||||
|
||||
; Jump
|
||||
db 3, "JMP", 0b11000011, 0x81, 0x00
|
||||
db 3, "JNZ", 0b11000010, 0x81, 0x00
|
||||
db 2, "JZ", 0b11001010, 0x81, 0x00
|
||||
db 3, "JNC", 0b11010010, 0x81, 0x00
|
||||
db 2, "JC", 0b11011010, 0x81, 0x00
|
||||
db 3, "JPO", 0b11100010, 0x81, 0x00
|
||||
db 3, "JPE", 0b11101010, 0x81, 0x00
|
||||
db 2, "JP", 0b11110010, 0x81, 0x00
|
||||
db 2, "JM", 0b11111010, 0x81, 0x00
|
||||
|
||||
; Call
|
||||
db 4, "CALL", 0b11001101, 0x81, 0x00
|
||||
db 3, "CNZ", 0b11000100, 0x81, 0x00
|
||||
db 2, "CZ", 0b11001100, 0x81, 0x00
|
||||
db 3, "CNC", 0b11010100, 0x81, 0x00
|
||||
db 2, "CC", 0b11011100, 0x81, 0x00
|
||||
db 3, "CPO", 0b11100100, 0x81, 0x00
|
||||
db 3, "CPE", 0b11101100, 0x81, 0x00
|
||||
db 2, "CP", 0b11110100, 0x81, 0x00
|
||||
db 2, "CM", 0b11111100, 0x81, 0x00
|
||||
|
||||
; Return
|
||||
db 3, "RET", 0b11001001, 0x00, 0x00
|
||||
db 3, "RNZ", 0b11000000, 0x00, 0x00
|
||||
db 2, "RZ", 0b11001000, 0x00, 0x00
|
||||
db 3, "RNC", 0b11010000, 0x00, 0x00
|
||||
db 2, "RC", 0b11011000, 0x00, 0x00
|
||||
db 3, "RPO", 0b11100000, 0x00, 0x00
|
||||
db 3, "RPE", 0b11101000, 0x00, 0x00
|
||||
db 2, "RP", 0b11110000, 0x00, 0x00
|
||||
db 2, "RM", 0b11111000, 0x00, 0x00
|
||||
|
||||
db 3, "RST", 0b11000111, 0x73, 0x00
|
||||
db 4, "PCHL", 0b11101001, 0x00, 0x00
|
||||
db 4, "PUSH", 0b11000101, 0x34, 0x00
|
||||
db 3, "POP", 0b11000001, 0x34, 0x00
|
||||
db 4, "XTHL", 0b11100011, 0x00, 0x00
|
||||
db 4, "SPHL", 0b11111001, 0x00, 0x00
|
||||
|
||||
db 2, "IN", 0b11011011, 0x80, 0x00
|
||||
db 3, "OUT", 0b11010011, 0x80, 0x00
|
||||
|
||||
db 2, "EI", 0b11111011, 0x00, 0x00
|
||||
db 2, "DI", 0b11110011, 0x00, 0x00
|
||||
db 3, "HLT", 0b01110110, 0x00, 0x00
|
||||
db 3, "NOP", 0b00000000, 0x00, 0x00
|
||||
|
||||
db 0
|
||||
@ -1,30 +0,0 @@
|
||||
popcnt:
|
||||
push bx
|
||||
push cx
|
||||
|
||||
mov bx, ax
|
||||
and ax, 0x5555 ; 8x 01
|
||||
and bx, 0xaaaa ; 8x 10
|
||||
shr bx, 1
|
||||
add ax, bx
|
||||
|
||||
mov bx, ax
|
||||
and ax, 0x3333 ; 4x 0011
|
||||
and bx, 0xcccc ; 4x 1100
|
||||
mov cl, 2
|
||||
shr bx, cl
|
||||
add ax, bx
|
||||
|
||||
mov bx, ax
|
||||
and ax, 0x0f0f ; 2x 00001111
|
||||
and bx, 0xf0f0 ; 2x 11110000
|
||||
mov cl, 4
|
||||
shr bx, cl
|
||||
add ax, bx
|
||||
|
||||
add al, ah
|
||||
xor ah, ah
|
||||
|
||||
pop cx
|
||||
pop bx
|
||||
ret
|
||||
@ -1,33 +0,0 @@
|
||||
; important functions in this file: kprintf
|
||||
|
||||
; print a word
|
||||
; in: ax
|
||||
print16:
|
||||
xchg ah,al
|
||||
call print8
|
||||
xchg ah,al
|
||||
|
||||
; print a byte
|
||||
; in: al
|
||||
print8:
|
||||
push ax ; avoid destroying ah
|
||||
push bx
|
||||
xor bx, bx
|
||||
aam 16 ; high nibble moved into ah, low nibble into al
|
||||
add ax, 0x3030
|
||||
push ax
|
||||
xchg al, ah
|
||||
call .nib
|
||||
pop ax
|
||||
call .nib
|
||||
pop bx
|
||||
pop ax
|
||||
ret
|
||||
.nib:
|
||||
cmp al, 0x3a
|
||||
jl .out
|
||||
add al, 0x07
|
||||
.out:
|
||||
mov ah, 0x0e
|
||||
int 0x10
|
||||
ret
|
||||
105
lib/printf.asm
105
lib/printf.asm
@ -1,105 +0,0 @@
|
||||
printf:
|
||||
cld
|
||||
pop si
|
||||
push bp
|
||||
mov bp, sp
|
||||
.loop:
|
||||
mov al, [cs:si]
|
||||
inc si
|
||||
cmp al, 0x00
|
||||
je .end
|
||||
cmp al, 0x25
|
||||
je .handle_25h
|
||||
.literal:
|
||||
call putc
|
||||
jmp .loop
|
||||
.end:
|
||||
pop bp
|
||||
push si
|
||||
ret
|
||||
.handle_25h:
|
||||
mov al, [cs:si]
|
||||
inc si
|
||||
cmp al, 0x25
|
||||
je .literal
|
||||
cmp al, 0x58 ; 'X'
|
||||
je .printhex
|
||||
cmp al, 0x55 ; 'U'
|
||||
je .printdec
|
||||
cmp al, 0x53 ; 'S'
|
||||
je .printstr
|
||||
mov al, 0x3F
|
||||
jmp .literal
|
||||
.printhex:
|
||||
add bp, 2
|
||||
mov ax, [bp]
|
||||
mov bx, 0x0010
|
||||
call print_number
|
||||
jmp .loop
|
||||
.printdec:
|
||||
add bp, 2
|
||||
mov ax, [bp]
|
||||
mov bx, 0x000A
|
||||
call print_number
|
||||
jmp .loop
|
||||
.printstr:
|
||||
add bp, 2
|
||||
mov ax, [bp]
|
||||
call print_string
|
||||
jmp .loop
|
||||
|
||||
; converts a integer to ascii
|
||||
; in ax input integer
|
||||
; bx base
|
||||
; cx minimum number of digits
|
||||
; out bx garbled
|
||||
; dx garbled
|
||||
print_number_padded:
|
||||
xor dx, dx
|
||||
div bx
|
||||
push dx
|
||||
dec cx
|
||||
jz .nopad
|
||||
call print_number_padded
|
||||
jmp print_number.end
|
||||
.nopad:
|
||||
call print_number
|
||||
jmp print_number.end
|
||||
|
||||
; converts a integer to ascii
|
||||
; in ax input integer
|
||||
; bx base
|
||||
; out bx garbled
|
||||
; dx garbled
|
||||
print_number:
|
||||
xor dx, dx
|
||||
div bx ; ax = dx:ax / 10, dx = dx:ax % 10
|
||||
push dx
|
||||
and ax, ax
|
||||
jz .end
|
||||
call print_number
|
||||
.end:
|
||||
pop bx
|
||||
xor bh, bh
|
||||
add bx, print_chars
|
||||
mov al, [cs:bx]
|
||||
call putc
|
||||
ret
|
||||
|
||||
; putc's a string
|
||||
; in DS:AX null-terminated string
|
||||
print_string:
|
||||
push si
|
||||
mov si, ax
|
||||
.loop:
|
||||
lodsb
|
||||
cmp al, 0x00
|
||||
je .end
|
||||
call putc
|
||||
jmp .loop
|
||||
.end:
|
||||
pop si
|
||||
ret
|
||||
|
||||
print_chars:
|
||||
db "0123456789ABCDEF"
|
||||
294
rom/debug.asm
294
rom/debug.asm
@ -1,294 +0,0 @@
|
||||
cpu 8086
|
||||
org 0x0000
|
||||
|
||||
%macro push8086 0
|
||||
push ss
|
||||
push es
|
||||
push ds
|
||||
push di
|
||||
push si
|
||||
push bp
|
||||
push sp
|
||||
push bx
|
||||
push dx
|
||||
push cx
|
||||
push ax
|
||||
|
||||
; adjust stored SP to be value before interrupt
|
||||
mov bp, sp
|
||||
mov [bp+08], bp
|
||||
add WORD [bp+08], 28
|
||||
%endmacro
|
||||
|
||||
%macro pop8086 0
|
||||
pop ax
|
||||
pop cx
|
||||
pop dx
|
||||
pop bx
|
||||
add sp, 2 ; skip SP
|
||||
pop bp
|
||||
pop si
|
||||
pop di
|
||||
pop ds
|
||||
pop es
|
||||
add sp, 2 ; skip SS
|
||||
%endmacro
|
||||
|
||||
rom:
|
||||
db 0x55, 0xAA
|
||||
.sectors:
|
||||
db 0x00
|
||||
.init:
|
||||
jmp init
|
||||
nop
|
||||
|
||||
.name:
|
||||
db "RDOS DEBUG", 0
|
||||
|
||||
times (0x18 - ($-$$)) db 0
|
||||
.pcir_ptr:
|
||||
dw 0
|
||||
|
||||
times (0x1A - ($-$$)) db 0
|
||||
.pnp_ptr:
|
||||
dw pnp
|
||||
|
||||
pnp:
|
||||
db "$PnP"
|
||||
.version:
|
||||
db 1 ; version 1
|
||||
.length:
|
||||
db 2 ; 2 * 16 length
|
||||
dw 0 ; offset of next header
|
||||
db 0
|
||||
.checksum:
|
||||
db 0 ; checksum (filled by fix-rom)
|
||||
dd 0 ; device identifier
|
||||
dw 0 ; manufacturer string
|
||||
dw rom.name ; product name string
|
||||
db 0,0,0 ; device type string
|
||||
db 0x20 ; device indicator, bit for "read cacheable" set
|
||||
dw 0 ; boot connection vector
|
||||
dw 0 ; boot disconnect vector
|
||||
dw 0 ; bootstrap entry point
|
||||
dw 0 ; reserved
|
||||
dw 0
|
||||
|
||||
init:
|
||||
mov bx, 0
|
||||
mov dx, isr_divide_error
|
||||
call hook_int
|
||||
|
||||
mov bx, 1
|
||||
mov dx, isr_singlestep
|
||||
call hook_int
|
||||
|
||||
mov bx, 2
|
||||
mov dx, isr_nmi
|
||||
call hook_int
|
||||
|
||||
mov bx, 3
|
||||
mov dx, isr_breakpoint
|
||||
call hook_int
|
||||
|
||||
mov bx, 4
|
||||
mov dx, isr_overflow
|
||||
call hook_int
|
||||
|
||||
; 5 left out
|
||||
|
||||
mov bx, 6
|
||||
mov dx, isr_invalid_opcode
|
||||
call hook_int
|
||||
|
||||
push cs
|
||||
pop ds
|
||||
mov si, rom.name
|
||||
push cs
|
||||
push si
|
||||
call printf
|
||||
db "%S %X", 0x0A, 0x0D, 0
|
||||
add sp, 4
|
||||
|
||||
retf
|
||||
|
||||
; Hook interrupt
|
||||
hook_int:
|
||||
; bx times 4
|
||||
add bx, bx
|
||||
add bx, bx
|
||||
; store offset
|
||||
mov [bx], dx
|
||||
; store segment
|
||||
push ax
|
||||
mov ax, cs
|
||||
mov [bx+2], ax
|
||||
pop ax
|
||||
ret
|
||||
|
||||
putc:
|
||||
push bx
|
||||
push cx
|
||||
mov ah, 0x0e
|
||||
mov bx, 0x0000
|
||||
int 0x10
|
||||
pop cx
|
||||
pop bx
|
||||
ret
|
||||
|
||||
; Names for words in debug frame
|
||||
; Two characters per word, 14 words total
|
||||
debug_frame_names:
|
||||
; general-purpose registers
|
||||
db "AXCXDXBXSPBPSIDI"
|
||||
; extra registers
|
||||
db "DSESSSIPCSFL"
|
||||
|
||||
; Names for bits in debug_frame+26 (FL/Flags register)
|
||||
; One character per bit, 16 bits total
|
||||
debug_frame_flags:
|
||||
db "++++ODIT"
|
||||
db "SZ+A+P+C"
|
||||
|
||||
; Print a single register from the frame
|
||||
; in SI frame offset for register
|
||||
debug_frame_register_print:
|
||||
mov bx, debug_frame_names
|
||||
mov al, [cs:bx+si] ; first name char load
|
||||
call putc
|
||||
mov al, [cs:bx+si+1] ; second name char load
|
||||
call putc
|
||||
mov al, '='
|
||||
call putc
|
||||
mov ax, [ss:bp+si] ; value load
|
||||
; prepare call to print_number
|
||||
push bx
|
||||
push cx
|
||||
mov bx, 0x0010
|
||||
mov cx, 3
|
||||
call print_number_padded
|
||||
pop cx
|
||||
pop bx
|
||||
mov al, ' '
|
||||
call putc
|
||||
ret
|
||||
|
||||
debug_frame_print:
|
||||
mov si, 0
|
||||
mov cx, 8
|
||||
.reg1loop:
|
||||
call debug_frame_register_print
|
||||
add si, 2
|
||||
loop .reg1loop
|
||||
|
||||
mov dx, [ss:bp+26]
|
||||
mov di, debug_frame_flags
|
||||
mov cx, 0x0010
|
||||
.flag_loop:
|
||||
mov al, [cs:di]
|
||||
inc di
|
||||
cmp al, '+'
|
||||
je .next
|
||||
test dx, 0x8000
|
||||
jnz .write
|
||||
mov al, '-'
|
||||
.write:
|
||||
call putc
|
||||
.next:
|
||||
sal dx, 1
|
||||
loop .flag_loop
|
||||
|
||||
call printf
|
||||
db 0x0A, 0x0D, 0
|
||||
|
||||
mov si, 16
|
||||
mov cx, 5
|
||||
.reg2loop:
|
||||
call debug_frame_register_print
|
||||
add si, 2
|
||||
loop .reg2loop
|
||||
|
||||
call printf
|
||||
db 0x0A, 0x0D, 0
|
||||
|
||||
ret
|
||||
|
||||
isr_divide_error:
|
||||
push8086
|
||||
|
||||
call printf
|
||||
db 0x0A, 0x0D, "INT 0 - DIVIDE ERROR", 0x0A, 0x0D, 0
|
||||
|
||||
call debug_frame_print
|
||||
|
||||
jmp halt
|
||||
|
||||
isr_singlestep:
|
||||
push8086
|
||||
|
||||
call printf
|
||||
db 0x0A, 0x0D, 0
|
||||
|
||||
call debug_frame_print
|
||||
|
||||
; wait for keypress
|
||||
xor ax, ax
|
||||
int 0x16
|
||||
|
||||
; enable trace flag so we fire again after next instruction
|
||||
or word [ss:bp+26], 0x0100
|
||||
|
||||
pop8086
|
||||
iret
|
||||
|
||||
isr_nmi:
|
||||
push8086
|
||||
|
||||
call printf
|
||||
db 0x0A, 0x0D, "INT 2 - NON-MASKABLE INTERRUPT", 0x0A, 0x0D, 0
|
||||
|
||||
call debug_frame_print
|
||||
|
||||
jmp halt
|
||||
|
||||
isr_breakpoint:
|
||||
push8086
|
||||
|
||||
call printf
|
||||
db 0x0A, 0x0D, 0
|
||||
|
||||
call debug_frame_print
|
||||
|
||||
pop8086
|
||||
iret
|
||||
|
||||
isr_overflow:
|
||||
push8086
|
||||
|
||||
call printf
|
||||
db 0x0A, 0x0D, "INT 4 - OVERFLOW", 0x0A, 0x0D, 0
|
||||
|
||||
call debug_frame_print
|
||||
|
||||
jmp halt
|
||||
|
||||
isr_invalid_opcode:
|
||||
push8086
|
||||
|
||||
call printf
|
||||
db 0x0A, 0x0D, "INT 6 - INVALID OPCODE", 0x0A, 0x0D, 0
|
||||
|
||||
call debug_frame_print
|
||||
|
||||
jmp halt
|
||||
|
||||
halt:
|
||||
call printf
|
||||
db "HALTED", 0x0A, 0x0D, 0
|
||||
.loop:
|
||||
hlt
|
||||
jmp halt
|
||||
|
||||
%include "printf.asm"
|
||||
|
||||
align 512
|
||||
@ -1,518 +0,0 @@
|
||||
#include <stdio.h>
|
||||
#include <stdint.h>
|
||||
#include <string.h>
|
||||
#include <stdlib.h>
|
||||
|
||||
uint8_t mem[64*1024];
|
||||
|
||||
typedef struct flagbits {
|
||||
unsigned int c : 1;
|
||||
unsigned int u1 : 1;
|
||||
unsigned int p : 1;
|
||||
unsigned int u3 : 1;
|
||||
|
||||
unsigned int a : 1;
|
||||
unsigned int u5 : 1;
|
||||
unsigned int z : 1;
|
||||
unsigned int s : 1;
|
||||
} flagbits;
|
||||
|
||||
typedef struct reg {
|
||||
uint8_t flags;
|
||||
uint8_t a;
|
||||
uint8_t c;
|
||||
uint8_t b;
|
||||
uint8_t e;
|
||||
uint8_t d;
|
||||
uint8_t l;
|
||||
uint8_t h;
|
||||
} reg;
|
||||
|
||||
typedef struct regp {
|
||||
uint16_t psw;
|
||||
uint16_t bc;
|
||||
uint16_t de;
|
||||
uint16_t hl;
|
||||
} regp;
|
||||
|
||||
union regset {
|
||||
struct reg reg;
|
||||
struct regp regp;
|
||||
} regset;
|
||||
|
||||
#define A regset.reg.a
|
||||
#define B regset.reg.b
|
||||
#define C regset.reg.c
|
||||
#define D regset.reg.d
|
||||
#define E regset.reg.e
|
||||
#define H regset.reg.h
|
||||
#define L regset.reg.l
|
||||
#define M mem[HL]
|
||||
|
||||
#define BC regset.regp.bc
|
||||
#define DE regset.regp.de
|
||||
#define HL regset.regp.hl
|
||||
|
||||
#define flags (*(struct flagbits*)®set.reg.flags)
|
||||
|
||||
uint16_t IP = 0x100;
|
||||
uint16_t SP = 0;
|
||||
unsigned int tmp;
|
||||
|
||||
// Dump registers
|
||||
void dump() {
|
||||
printf("\n");
|
||||
printf("A=%02X BC=%04X DE=%04X HL=%04X M=%02X SP=%04X ", A, BC, DE, HL, M, SP);
|
||||
printf("%c", flags.s ? 'S' : '-');
|
||||
printf("%c", flags.z ? 'Z' : '-');
|
||||
printf("%c", flags.a ? 'A' : '-');
|
||||
printf("%c", flags.p ? 'P' : '-');
|
||||
printf("%c", flags.c ? 'C' : '-');
|
||||
|
||||
printf("\n");
|
||||
printf("IP=%04X : %02X %02X\n", IP, mem[IP], mem[IP+1]);
|
||||
}
|
||||
|
||||
uint8_t imm8() {
|
||||
uint8_t r = *(uint8_t*)&mem[IP];
|
||||
IP++;
|
||||
return r;
|
||||
}
|
||||
|
||||
uint16_t imm16() {
|
||||
uint16_t r = *(uint16_t*)&mem[IP];
|
||||
IP+=2;
|
||||
return r;
|
||||
}
|
||||
|
||||
void push(uint16_t v) {
|
||||
SP -= 2;
|
||||
*(uint16_t*)&mem[SP] = v;
|
||||
}
|
||||
|
||||
uint16_t pop() {
|
||||
uint16_t v = *(uint16_t*)&mem[SP];
|
||||
SP += 2;
|
||||
return v;
|
||||
}
|
||||
|
||||
void in(uint8_t port) {
|
||||
|
||||
}
|
||||
|
||||
void out(uint8_t port) {
|
||||
|
||||
}
|
||||
|
||||
int has_even_parity(uint8_t x){
|
||||
unsigned int count = 0, i, b = 1;
|
||||
|
||||
for(i = 0; i < 8; i++){
|
||||
if( x & (b << i) ){count++;}
|
||||
}
|
||||
|
||||
if( (count % 2) ){return 0;}
|
||||
return 1;
|
||||
}
|
||||
|
||||
void cpm_syscall(int number) {
|
||||
switch(number) {
|
||||
case 0:
|
||||
exit(0);
|
||||
break;
|
||||
case 2:
|
||||
printf("%c", E);
|
||||
break;
|
||||
case 0x0C:
|
||||
H=0x02;
|
||||
L=0x00;
|
||||
break;;
|
||||
default:
|
||||
fprintf(stderr, "Fatal: Unhandled CP/M syscall C=%02Xh\n", number);
|
||||
exit(1);
|
||||
}
|
||||
}
|
||||
|
||||
void call(uint16_t v) {
|
||||
switch(v) {
|
||||
case 0:
|
||||
exit(0);
|
||||
break;;
|
||||
case 5:
|
||||
cpm_syscall(C);
|
||||
break;;
|
||||
default:
|
||||
push(IP);
|
||||
IP=v;
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
void interrupt(int number) {
|
||||
call(number << 3);
|
||||
}
|
||||
|
||||
#define add16c(a, b) \
|
||||
tmp = a + b; \
|
||||
flags.c = (tmp >> 16) & 1
|
||||
|
||||
#define unarync(a, op) \
|
||||
tmp=a; \
|
||||
tmp op; \
|
||||
flags.p = has_even_parity(tmp & 8); \
|
||||
flags.z = !(tmp); \
|
||||
flags.s = (tmp >> 7) & 1; \
|
||||
a=tmp
|
||||
|
||||
#define aritht(a, op, b) \
|
||||
tmp=a; \
|
||||
tmp=a op b; \
|
||||
flags.c = (tmp >> 8) & 1; \
|
||||
flags.p = has_even_parity(tmp & 8); \
|
||||
flags.z = !(tmp); \
|
||||
flags.s = (tmp >> 7) & 1;
|
||||
|
||||
#define arith(a, op, b) \
|
||||
aritht(a, op, b); \
|
||||
a=tmp
|
||||
|
||||
// Execute a single instruction
|
||||
void step() {
|
||||
uint8_t opcode = mem[IP];
|
||||
IP++;
|
||||
switch(opcode) {
|
||||
case 0x00: break;;
|
||||
case 0x01: BC=imm16(); break;;
|
||||
case 0x02: mem[BC]=A; break;;
|
||||
case 0x03: BC++;
|
||||
case 0x04: unarync(B, ++); break;;
|
||||
case 0x05: unarync(B, --); break;;
|
||||
case 0x06: B=imm8(); break;;
|
||||
case 0x07: tmp=A; A = A << 1 | flags.c; flags.c = tmp >> 7; break;;
|
||||
|
||||
case 0x09: HL=add16c(HL,BC); break;;
|
||||
case 0x0a: A=mem[BC]; break;;
|
||||
case 0x0b: BC--;
|
||||
case 0x0c: unarync(B, ++); break;;
|
||||
case 0x0d: unarync(B, --); break;;
|
||||
case 0x0e: C=imm8(); break;;
|
||||
|
||||
case 0x11: DE=imm16(); break;;
|
||||
case 0x12: mem[DE]=A; break;;
|
||||
case 0x13: DE++;
|
||||
case 0x14: unarync(D, ++); break;;
|
||||
case 0x15: unarync(D, --); break;;
|
||||
case 0x16: D=imm8(); break;;
|
||||
|
||||
case 0x19: HL=add16c(HL,DE); break;;
|
||||
case 0x1a: A=mem[DE]; break;;
|
||||
case 0x1b: DE--;
|
||||
case 0x1c: unarync(E, ++); break;;
|
||||
case 0x1d: unarync(E, --); break;;
|
||||
case 0x1e: E=imm8(); break;;
|
||||
|
||||
case 0x21: HL=imm16(); break;;
|
||||
case 0x22: *(uint16_t*)&mem[imm16()]=HL; break;;
|
||||
case 0x23: HL++;
|
||||
case 0x24: unarync(H, ++); break;;
|
||||
case 0x25: unarync(H, --); break;;
|
||||
case 0x26: H=imm8(); break;;
|
||||
|
||||
case 0x29: HL=add16c(HL,HL); break;;
|
||||
case 0x2a: HL=*(uint16_t*)&mem[imm16()]; break;;
|
||||
case 0x2b: HL--;
|
||||
case 0x2c: unarync(L, ++); break;;
|
||||
case 0x2d: unarync(L, --); break;;
|
||||
case 0x2e: L=imm8(); break;;
|
||||
case 0x2f: A=~A; break;;
|
||||
|
||||
case 0x31: SP=imm16(); break;;
|
||||
case 0x32: mem[imm16()]=A; break;;
|
||||
case 0x33: SP++;
|
||||
case 0x34: unarync(M, ++); break;;
|
||||
case 0x35: unarync(M, --); break;;
|
||||
case 0x36: M=imm8(); break;;
|
||||
case 0x37: flags.c = 1; break;;
|
||||
|
||||
case 0x39: HL=add16c(HL,SP); break;;
|
||||
case 0x3a: A=mem[imm16()]; break;;
|
||||
case 0x3b: SP--;
|
||||
case 0x3c: unarync(A, ++); break;;
|
||||
case 0x3d: unarync(A, --); break;;
|
||||
case 0x3e: A=imm8(); break;;
|
||||
case 0x3f: flags.c = !flags.c; break;;
|
||||
|
||||
case 0x40: B=B; break;;
|
||||
case 0x41: B=C; break;;
|
||||
case 0x42: B=D; break;;
|
||||
case 0x43: B=E; break;;
|
||||
case 0x44: B=H; break;;
|
||||
case 0x45: B=L; break;;
|
||||
case 0x46: B=M; break;;
|
||||
case 0x47: B=A; break;;
|
||||
|
||||
case 0x48: C=B; break;;
|
||||
case 0x49: C=C; break;;
|
||||
case 0x4a: C=D; break;;
|
||||
case 0x4b: C=E; break;;
|
||||
case 0x4c: C=H; break;;
|
||||
case 0x4d: C=L; break;;
|
||||
case 0x4e: C=M; break;;
|
||||
case 0x4f: C=A; break;;
|
||||
|
||||
case 0x50: D=B; break;;
|
||||
case 0x51: D=C; break;;
|
||||
case 0x52: D=D; break;;
|
||||
case 0x53: D=E; break;;
|
||||
case 0x54: D=H; break;;
|
||||
case 0x55: D=L; break;;
|
||||
case 0x56: D=M; break;;
|
||||
case 0x57: D=A; break;;
|
||||
|
||||
case 0x58: E=B; break;;
|
||||
case 0x59: E=C; break;;
|
||||
case 0x5a: E=D; break;;
|
||||
case 0x5b: E=E; break;;
|
||||
case 0x5c: E=H; break;;
|
||||
case 0x5d: E=L; break;;
|
||||
case 0x5e: E=M; break;;
|
||||
case 0x5f: E=A; break;;
|
||||
|
||||
case 0x60: H=B; break;;
|
||||
case 0x61: H=C; break;;
|
||||
case 0x62: H=D; break;;
|
||||
case 0x63: H=E; break;;
|
||||
case 0x64: H=H; break;;
|
||||
case 0x65: H=L; break;;
|
||||
case 0x66: H=M; break;;
|
||||
case 0x67: H=A; break;;
|
||||
|
||||
case 0x68: L=B; break;;
|
||||
case 0x69: L=C; break;;
|
||||
case 0x6a: L=D; break;;
|
||||
case 0x6b: L=E; break;;
|
||||
case 0x6c: L=H; break;;
|
||||
case 0x6d: L=L; break;;
|
||||
case 0x6e: L=M; break;;
|
||||
case 0x6f: L=A; break;;
|
||||
|
||||
case 0x70: M=B; break;;
|
||||
case 0x71: M=C; break;;
|
||||
case 0x72: M=D; break;;
|
||||
case 0x73: M=E; break;;
|
||||
case 0x74: M=H; break;;
|
||||
case 0x75: M=L; break;;
|
||||
case 0x76: exit(0); break;;
|
||||
case 0x77: M=A; break;;
|
||||
|
||||
case 0x78: A=B; break;;
|
||||
case 0x79: A=C; break;;
|
||||
case 0x7a: A=D; break;;
|
||||
case 0x7b: A=E; break;;
|
||||
case 0x7c: A=H; break;;
|
||||
case 0x7d: A=L; break;;
|
||||
case 0x7e: A=M; break;;
|
||||
case 0x7f: A=A; break;;
|
||||
|
||||
case 0x80: arith(A, +, B); break;;
|
||||
case 0x81: arith(A, +, C); break;;
|
||||
case 0x82: arith(A, +, D); break;;
|
||||
case 0x83: arith(A, +, E); break;;
|
||||
case 0x84: arith(A, +, H); break;;
|
||||
case 0x85: arith(A, +, L); break;;
|
||||
case 0x86: arith(A, +, M); break;;
|
||||
case 0x87: arith(A, +, A); break;;
|
||||
|
||||
case 0x88: arith(A, +flags.c+, B); break;;
|
||||
case 0x89: arith(A, +flags.c+, C); break;;
|
||||
case 0x8A: arith(A, +flags.c+, D); break;;
|
||||
case 0x8B: arith(A, +flags.c+, E); break;;
|
||||
case 0x8C: arith(A, +flags.c+, H); break;;
|
||||
case 0x8D: arith(A, +flags.c+, L); break;;
|
||||
case 0x8E: arith(A, +flags.c+, M); break;;
|
||||
case 0x8F: arith(A, +flags.c+, A); break;;
|
||||
|
||||
case 0x90: arith(A, -, B); break;;
|
||||
case 0x91: arith(A, -, C); break;;
|
||||
case 0x92: arith(A, -, D); break;;
|
||||
case 0x93: arith(A, -, E); break;;
|
||||
case 0x94: arith(A, -, H); break;;
|
||||
case 0x95: arith(A, -, L); break;;
|
||||
case 0x96: arith(A, -, M); break;;
|
||||
case 0x97: arith(A, -, A); break;;
|
||||
|
||||
case 0x98: arith(A, -flags.c-, B); break;;
|
||||
case 0x99: arith(A, -flags.c-, C); break;;
|
||||
case 0x9A: arith(A, -flags.c-, D); break;;
|
||||
case 0x9B: arith(A, -flags.c-, E); break;;
|
||||
case 0x9C: arith(A, -flags.c-, H); break;;
|
||||
case 0x9D: arith(A, -flags.c-, L); break;;
|
||||
case 0x9E: arith(A, -flags.c-, M); break;;
|
||||
case 0x9F: arith(A, -flags.c-, A); break;;
|
||||
|
||||
case 0xA0: arith(A, &, B); break;;
|
||||
case 0xA1: arith(A, &, C); break;;
|
||||
case 0xA2: arith(A, &, D); break;;
|
||||
case 0xA3: arith(A, &, E); break;;
|
||||
case 0xA4: arith(A, &, H); break;;
|
||||
case 0xA5: arith(A, &, L); break;;
|
||||
case 0xA6: arith(A, &, M); break;;
|
||||
case 0xA7: arith(A, &, A); break;;
|
||||
|
||||
case 0xA8: arith(A, ^, B); break;;
|
||||
case 0xA9: arith(A, ^, C); break;;
|
||||
case 0xAA: arith(A, ^, D); break;;
|
||||
case 0xAB: arith(A, ^, E); break;;
|
||||
case 0xAC: arith(A, ^, H); break;;
|
||||
case 0xAD: arith(A, ^, L); break;;
|
||||
case 0xAE: arith(A, ^, M); break;;
|
||||
case 0xAF: arith(A, ^, A); break;;
|
||||
|
||||
case 0xB0: arith(A, |, B); break;;
|
||||
case 0xB1: arith(A, |, C); break;;
|
||||
case 0xB2: arith(A, |, D); break;;
|
||||
case 0xB3: arith(A, |, E); break;;
|
||||
case 0xB4: arith(A, |, H); break;;
|
||||
case 0xB5: arith(A, |, L); break;;
|
||||
case 0xB6: arith(A, |, M); break;;
|
||||
case 0xB7: arith(A, |, A); break;;
|
||||
|
||||
case 0xB8: aritht(A, -, B); break;;
|
||||
case 0xB9: aritht(A, -, C); break;;
|
||||
case 0xBA: aritht(A, -, D); break;;
|
||||
case 0xBB: aritht(A, -, E); break;;
|
||||
case 0xBC: aritht(A, -, H); break;;
|
||||
case 0xBD: aritht(A, -, L); break;;
|
||||
case 0xBE: aritht(A, -, M); break;;
|
||||
case 0xBF: aritht(A, -, A); break;;
|
||||
|
||||
case 0xC0: if (!flags.z) IP=pop(); break;;
|
||||
case 0xC1: BC=pop(); break;;
|
||||
case 0xC2: tmp=imm16(); if (!flags.z) IP=tmp; break;;
|
||||
case 0xC3: IP=imm16(); break;;
|
||||
case 0xC4: tmp=imm16(); if (!flags.z) call(tmp); break;;
|
||||
case 0xC5: push(BC); break;;
|
||||
case 0xC6: arith(A, +, imm8()); break;;
|
||||
case 0xC7: interrupt(0); break;;
|
||||
|
||||
case 0xC8: if (flags.z) IP=pop(); break;;
|
||||
case 0xC9: IP=pop(); break;;
|
||||
case 0xCA: tmp=imm16(); if (flags.z) IP=tmp; break;;
|
||||
case 0xCC: tmp=imm16(); if (flags.z) call(tmp); break;;
|
||||
case 0xCD: call(imm16()); break;;
|
||||
case 0xCE: arith(A, +flags.c+, imm8()); break;;
|
||||
case 0xCF: interrupt(1); break;;
|
||||
|
||||
case 0xD0: if (!flags.c) IP=pop(); break;;
|
||||
case 0xD1: DE=pop(); break;;
|
||||
case 0xD2: tmp=imm16(); if (!flags.c) IP=tmp; break;;
|
||||
case 0xD3: out(imm8()); break;;
|
||||
case 0xD4: tmp=imm16(); if (!flags.c) call(tmp); break;;
|
||||
case 0xD5: push(DE); break;;
|
||||
case 0xD6: arith(A, -, imm8()); break;;
|
||||
case 0xD7: interrupt(2); break;;
|
||||
|
||||
case 0xD8: if (flags.c) IP=pop(); break;;
|
||||
case 0xDA: tmp=imm16(); if (flags.c) IP=tmp; break;;
|
||||
case 0xDB: in(imm8()); break;;
|
||||
case 0xDC: tmp=imm16(); if (flags.c) call(tmp); break;;
|
||||
case 0xDE: arith(A, -flags.c-, imm8()); break;;
|
||||
case 0xDF: interrupt(3); break;;
|
||||
|
||||
case 0xE0: if (!flags.p) IP=pop(); break;;
|
||||
case 0xE1: HL=pop(); break;;
|
||||
case 0xE2: tmp=imm16(); if (!flags.p) IP=tmp; break;;
|
||||
case 0xE3: tmp=HL; HL=pop(); push(tmp); break;;
|
||||
case 0xE4: tmp=imm16(); if (!flags.p) call(tmp); break;;
|
||||
case 0xE5: push(HL); break;;
|
||||
case 0xE6: arith(A, &, imm8()); break;;
|
||||
case 0xE7: interrupt(4); break;;
|
||||
|
||||
case 0xE8: if (flags.p) IP=pop(); break;;
|
||||
case 0xE9: IP=HL; break;;
|
||||
case 0xEA: tmp=imm16(); if (flags.p) IP=tmp; break;;
|
||||
case 0xEB: tmp=HL; HL=DE; DE=tmp;; break;;
|
||||
case 0xEC: tmp=imm16(); if (flags.p) call(tmp); break;;
|
||||
case 0xEE: arith(A, ^, imm8()); break;;
|
||||
case 0xEF: interrupt(5); break;;
|
||||
|
||||
case 0xF0: if (!flags.s) IP=pop(); break;;
|
||||
case 0xF1: regset.regp.psw=pop(); break;;
|
||||
case 0xF2: tmp=imm16(); if (!flags.s) IP=tmp; break;;
|
||||
case 0xF4: tmp=imm16(); if (!flags.s) call(tmp); break;;
|
||||
case 0xF5: push(regset.regp.psw); break;;
|
||||
case 0xF6: arith(A, |, imm8()); break;;
|
||||
case 0xF7: interrupt(6); break;;
|
||||
|
||||
case 0xF8: if (flags.s) IP=pop(); break;;
|
||||
case 0xF9: SP=HL; break;;
|
||||
case 0xFA: tmp=imm16(); if (flags.s) IP=tmp; break;;
|
||||
case 0xFC: tmp=imm16(); if (flags.s) call(tmp); break;;
|
||||
case 0xFE: aritht(A, -, imm8()); break;;
|
||||
case 0xFF: interrupt(7); break;;
|
||||
|
||||
default:
|
||||
IP--;
|
||||
dump();
|
||||
fprintf(stderr, "Invalid opcode at IP=%04X\n", IP);
|
||||
exit(1);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
void copy_cmdline(char* str) {
|
||||
int i, c;
|
||||
uint8_t *len = &mem[0x80];
|
||||
char* ptr = (char*)&mem[0x81];
|
||||
c = strlen(str);
|
||||
// Clip at max length
|
||||
if (c>0x7E) {
|
||||
fprintf(stderr, "Command line too long, max is 126 bytes\n");
|
||||
exit(1);
|
||||
}
|
||||
memcpy(ptr, str, c);
|
||||
ptr[c]=0x0D;
|
||||
*len=c;
|
||||
}
|
||||
|
||||
int main(int argc, char** argv) {
|
||||
memset(&mem, sizeof(mem), 0);
|
||||
// Prepare default exit into int 20h
|
||||
mem[0]=0x76;
|
||||
push(0);
|
||||
|
||||
argc--;
|
||||
argv++;
|
||||
|
||||
while(argc && argv[0][0]=='-') {
|
||||
switch(argv[0][1]) {
|
||||
default:
|
||||
fprintf(stderr, "Unknown option %s\n", argv[0]);
|
||||
exit(1);
|
||||
break;
|
||||
}
|
||||
argc--;
|
||||
argv++;
|
||||
}
|
||||
|
||||
if (argc) {
|
||||
FILE* fd = fopen(argv[0], "r");
|
||||
fread(mem + IP, 1, sizeof(mem) - IP, fd);
|
||||
argc--;
|
||||
argv++;
|
||||
} else {
|
||||
fprintf(stderr, "No COM file specified\n");
|
||||
exit(1);
|
||||
}
|
||||
|
||||
if (argc) {
|
||||
copy_cmdline(argv[0]);
|
||||
} else {
|
||||
copy_cmdline("");
|
||||
}
|
||||
|
||||
while(1) {
|
||||
dump();
|
||||
step();
|
||||
}
|
||||
}
|
||||
@ -1,37 +0,0 @@
|
||||
#include <stdio.h>
|
||||
#include <sys/types.h>
|
||||
#include <sys/stat.h>
|
||||
#include <unistd.h>
|
||||
#include <stdlib.h>
|
||||
#include <stdint.h>
|
||||
|
||||
struct stat sbuf;
|
||||
|
||||
int main(int argc, char** argv) {
|
||||
FILE* fd = fopen(argv[1], "r+");
|
||||
fstat(fileno(fd), &sbuf);
|
||||
if (sbuf.st_size & 0x1F) {
|
||||
fprintf(stderr, "Filesize is not a multiple of 512 bytes\n");
|
||||
exit(1);
|
||||
}
|
||||
|
||||
// Fill out filesize flag
|
||||
fseek(fd, 2, SEEK_SET);
|
||||
fputc(sbuf.st_size >> 9, fd);
|
||||
|
||||
// Calculate checksum
|
||||
fseek(fd, 0, SEEK_SET);
|
||||
off_t i;
|
||||
uint8_t s;
|
||||
for (i=0; i<sbuf.st_size; i++) {
|
||||
s+=fgetc(fd);
|
||||
}
|
||||
|
||||
// Edit last byte so that checksum is 0
|
||||
fseek(fd, -1, SEEK_END);
|
||||
s=fgetc(fd)-s;
|
||||
fseek(fd, -1, SEEK_END);
|
||||
fputc(s, fd);
|
||||
|
||||
fclose(fd);
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user