Remove attempt of rom-based debugger
This commit is contained in:
parent
d6b5792ff7
commit
c604fd43e7
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@ -1,95 +0,0 @@
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; Prints instruction at DS:SI in human-readable form
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disasm: lodsb
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mov bx, opcodes
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jmp .scan
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.next: add bx, 8
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.scan: push ax
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and al, [cs:bx]
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cmp al, [cs:bx+1]
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pop ax
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jne .next
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push si
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push ax
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mov si, [cs:bx+2]
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call putcs
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pop ax
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pop si
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cmp word [cs:bx+4], 0
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je .ret
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push ax
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call space
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pop ax
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push ax
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call [cs:bx+4]
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pop ax
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cmp word [cs:bx+6], 0
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je .ret
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push ax
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call print_sep
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pop ax
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jmp [cs:bx+6]
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.ret: ret
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opcodes:
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; word 1: H=opcode value after AND L
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; word 2: ptr to memonic
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; word 3: procedure to print first operand
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; word 4: procedure to print second operand
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dw 0x50F8, mnem.push, operand.inr16, 0
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dw 0x58F8, mnem.pop, operand.inr16, 0
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dw 0xB0F8, mnem.mov, operand.inr8, 0
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dw 0xB8F8, mnem.mov, operand.inr16, operand.imm16
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dw 0xA4FF, mnem.movsb, 0, 0
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dw 0xA5FF, mnem.movsw, 0, 0
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dw 0x0000, mnem.db, operand.self, 0
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print_sep:
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mov al, ','
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call putc
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jmp space
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print_r8:
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push di
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mov di, bnames
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call print_r
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pop di
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ret
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print_r16:
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push di
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mov di, rnames
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call print_r
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pop di
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ret
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print_r:
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push bx
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mov bl, al
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xor bh, bh
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add bx, bx
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mov bx, [cs:bx+di]
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mov al, bl
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call putc
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mov al, bh
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call putc
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pop bx
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ret
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operand:
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.inr8: and al, 7
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jmp print_r8
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.inr16: and al, 7
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jmp print_r16
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.self: mov dl, al
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jmp print_dl
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.imm8: mov dl, [si]
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jmp print_dl
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.imm16: mov dx, [si]
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jmp print_dx
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163
debug/chario.asm
163
debug/chario.asm
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@ -1,163 +0,0 @@
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; Print AL
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space: mov al, ' '
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putc: push bx
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xor bx, bx
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mov ah, 0x0e
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int 0x10
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pop bx
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ret
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; Print code string CS:SI
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putcs: push ds
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push cs
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pop ds
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call putds
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pop ds
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ret
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; Print data string DS:SI
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putds: lodsb
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test al, al
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jz .ret
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call putc
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jmp putds
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.ret: ret
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crlf: mov al, 0x0A
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call putc
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mov al, 0x0D
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jmp putc
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print_dl:
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mov cl, 4
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; repeat 2 times
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call .c
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.c: mov al, dl
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shl dx, cl
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shr al, cl
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add al, 0x30
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cmp al, 0x3a
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jl putc
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add al, 7
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jmp putc
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print_dx:
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mov cl, 4
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; this double-call is essentially a 4 times repeating loop
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call .c1
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.c1: call .c2
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.c2: ; grab highest nibble from dx
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mov al, dh
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; remove highest nibble from dx
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shl dx, cl
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; shift away second-highest nibble that we accidentally copied
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shr al, cl
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; map 0-9 to ascii codes for '0' to '9'
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add al, 0x30
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; if result is larger than '9', ...
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cmp al, 0x3a
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jl putc
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; ... add 7 so we continue at 'A'
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add al, 7
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jmp putc
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print_esbx:
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push cx
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push dx
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mov dx, es
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call print_dx
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mov al, ':'
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call putc
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mov dx, bx
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call print_dx
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pop dx
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pop cx
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ret
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; Read character
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getc: xor ax, ax
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int 0x16
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test al, al
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jz getc
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test al, 0x80
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jnz getc
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ret
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; Read uppercased character
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getcu: call getc
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cmp al, 'a'
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jc .ret
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cmp al, 'z'
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ja .ret
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and al, 0xDF
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.ret: ret
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; Read hexadecimal character
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getch: call getcu
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; everything above F is invalid
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cmp al, 'F'
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ja getch
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; everything above or equal A is ok
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cmp al, 'A'
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jae .ret
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; everything above 9 is invalid
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cmp al, '9'
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ja getc
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; everything above or equal 0 is valid
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cmp al, '0'
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jae .ret
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; everything above or equal ' ' is invalid
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cmp al, ' '
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jae getch
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.ret: ret
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; Read string into inbuf
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; IN ingetc ptr to getc function
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; inlen max number of chars
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gets: push bx
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mov di, inbuf
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; calculate max pointer for writing
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mov dx, [inmin]
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.loop: call [ingetc]
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; test for Ctrl+C, Enter and Backspace
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cmp al, 0x03
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je .can
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cmp al, 0x0D
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je .enter
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cmp al, 0x08
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je .bs
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; ignore other ctl chars
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cmp al, 0x20
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jc .loop
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; check if we are full
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mov bx, di
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sub bx, inbuf
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; bl is now number of characters we have
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cmp bl, dh
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jnc .loop
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stosb
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call putc
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jmp .loop
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; backspace: print, print space, print backspace again
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.bs: cmp di, inbuf
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jbe .loop
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push ax
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call putc
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call space
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pop ax
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call putc
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dec di
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jmp .loop
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; ctrl+c: return with carry set
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.can: stc
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pop bx
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ret
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; enter: if enough chars, return
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.enter: mov bx, di
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sub bx, inbuf
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cmp bl, dl
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jc .loop
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xor al, al
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stosb
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pop bx
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ret
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@ -1,90 +0,0 @@
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; Commands and utils related to displaying or editing memory or registers
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cmd_r: cmp byte [si], 0
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je printregs
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call eat_register
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jc .err
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mov al, [cs:bx+rnames]
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call putc
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mov al, [cs:bx+rnames+1]
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call putc
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call space
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call edit_word
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call crlf
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ret
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.err: mov di, eat_register.emsg
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jmp parse_error
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printregs:
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mov cx, 13
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xor bx, bx
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mov ah, 0x0e
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mov si, reg_ax
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.loop: push cx
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mov dx, [cs:si+rnames]
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lodsw
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call printreg
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pop cx
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loop .loop
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mov dx, [reg_fl]
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mov si, fnames
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mov cx, 16
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.floop: mov al, [cs:si]
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inc si
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cmp al, '+'
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je .fskip
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test dx, 0x8000
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jnz .fprnt
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mov al, '-'
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.fprnt: int 0x10
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.fskip: shl dx, 1
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loop .floop
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call space
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push ds
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mov ds, [es:reg_cs]
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mov si, [es:reg_ip]
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call disasm
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pop ds
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call crlf
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ret
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printreg:
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push ax
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mov al, dl
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call putc
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mov al, dh
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call putc
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mov al, '='
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call putc
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pop dx
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call print_dx
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call space
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ret
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; let the user edit the word at ES:BX
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edit_word:
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push bx
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mov dx, [es:bx]
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call print_dx
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mov al, '.'
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call putc
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mov byte [inmin], 4
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mov byte [inmax], 4
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mov word [ingetc], getch
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call gets
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pop bx
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jc .ret
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mov si, inbuf
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call eat_hex_word
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jc .err
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mov [es:bx], dx
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.ret: ret
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.err: call crlf
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mov di, eat_hex_word.emsg
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jmp parse_error
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@ -1,20 +0,0 @@
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rnames: ; general purpose regs
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db "AXCXDXBXSPBPSIDI"
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; segment regs
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db "ESCSSSDS"
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; special regs
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db "IPFL"
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bnames: ; 8-bit registers
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db "ALCLDLBLAHCHDHBH"
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fnames: ; control flags
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db "++++ODIT"
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; status flags
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db "SZ+A+P+C"
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mnem:
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.db: db "DB", 0
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.push: db "PUSH", 0
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.pop: db "POP", 0
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.mov: db "MOV", 0
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.movsb: db "MOVSB", 0
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.movsw: db "MOVSW", 0
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119
debug/parse.asm
119
debug/parse.asm
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@ -1,119 +0,0 @@
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; IN DS:SI remaining unparsed string
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; CS:DI error message
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parse_error:
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push si
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mov si, .str1
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call putcs
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mov si, di
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call putcs
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mov si, .str2
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call putcs
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pop si
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call putds
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jmp crlf
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.str1: db "Not a ", 0
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.str2: db ": ", 0
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; Advance over whitespace
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; IN DS:SI
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eat_whitespace:
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.loop: lodsb
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cmp al, 0x20
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je .loop
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cmp al, 0x0A
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je .loop
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cmp al, 0x0D
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je .loop
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cmp al, 0x09
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je .loop
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dec si
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ret
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; Parse a register name
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; IN DS:SI string to read
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; OUT CF set if no match
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; BX register number * 2 if CF clear
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eat_register:
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push si
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push es
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lodsw
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and ax, 0xDFDF
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; ES := CS
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push cs
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pop es
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mov di, rnames
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mov cx, 14
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repne scasw
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pop es
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jne .fail
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pop bx
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mov bx, di
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sub bx, (rnames+2)
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clc
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ret
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.fail: pop si
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stc
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ret
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.emsg: db "register name", 0
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; Parse hex digit
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; IN DS:SI
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; OUT AL
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eat_hex_digit:
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push si
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lodsb
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sub al, '0'
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jc .err
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cmp al, 9
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jna .ret
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sub al, 7
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cmp al, 0xF
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ja .err
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.ret: add sp, 2
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ret
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.err: pop si
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stc
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ret
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.emsg: db "hex digit", 0
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; Parse hexadecimal byte
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; IN DS:SI
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; OUT DL or carry set
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eat_hex_byte:
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push si
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mov cl, 4
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xor dl, dl
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call eat_hex_digit
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jc .err
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or dl, al
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shl dl, cl
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call eat_hex_digit
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jc .err
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or dl, al
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add sp, 2
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ret
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.err: pop si
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stc
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ret
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.emsg: db "hex byte", 0
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; Parse hexadecimal word
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; OUT DX or carry set
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eat_hex_word:
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push si
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xor dx, dx
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call eat_hex_byte
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jc .err
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mov dh, dl
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call eat_hex_byte
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jc .err
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add sp, 2
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ret
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.err: pop si
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stc
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ret
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.emsg: db "hex word", 0
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@ -1,83 +0,0 @@
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; Commands related to executing debugged code
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cmd_g: and word [reg_fl+1], 0xfe
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jmp return
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cmd_t: or word [reg_fl+1], 0x03
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jmp return
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int3entry:
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; save DS and load bss segment from IVT
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push ds
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mov ds, [cs:zero]
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mov ds, [bssvec*4]
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; save AX so we can work with it
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mov [reg_ax], ax
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; pop DS, IP, CS and flags from stack
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pop ax
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mov [reg_ds], ax
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pop ax
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mov [reg_ip], ax
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pop ax
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mov [reg_cs], ax
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pop ax
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mov [reg_fl], ax
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; save the other registers
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mov [reg_cx], cx
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mov [reg_dx], dx
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mov [reg_bx], bx
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mov [reg_sp], sp
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mov [reg_bp], bp
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mov [reg_si], si
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mov [reg_di], di
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; save other segment registers we can access
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mov [reg_ss], ss
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mov [reg_es], es
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; initialize other segments and setup stack
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mov ax, ds
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mov es, ax
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mov ss, ax
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mov sp, stack
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call crlf
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call printregs
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loop: ; show prompt
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mov al, '-'
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call putc
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; read data
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mov byte [inmin], 1
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mov byte [inmax], 16
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mov word [ingetc], getcu
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call gets
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pushf
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call crlf
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popf
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jc loop
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; execute
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call runcmd
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jmp loop
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return: ; restore stack pointer
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mov ss, [reg_ss]
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mov sp, [reg_sp]
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; push flags, CS and IP
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mov ax, [reg_fl]
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push ax
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mov ax, [reg_cs]
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push ax
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mov ax, [reg_ip]
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push ax
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; restore GPR
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mov ax, [reg_ax]
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mov cx, [reg_cx]
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mov dx, [reg_dx]
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mov bx, [reg_bx]
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mov bp, [reg_bp]
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mov si, [reg_si]
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mov di, [reg_di]
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; restore segment registers
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; DS must be last
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mov es, [reg_es]
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mov ds, [reg_ds]
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; final jump back
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iret
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@ -1,35 +0,0 @@
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; Utility commands
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cmd_h: call eat_whitespace
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call eat_hex_word
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jc .err
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mov bx, dx
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call eat_whitespace
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call eat_hex_word
|
||||
jc .err
|
||||
|
||||
xchg bx, dx
|
||||
|
||||
push dx
|
||||
add dx, bx
|
||||
call print_dx
|
||||
call space
|
||||
pop dx
|
||||
|
||||
sub dx, bx
|
||||
call print_dx
|
||||
|
||||
jmp crlf
|
||||
.err: mov di, eat_hex_word.emsg
|
||||
jmp parse_error
|
||||
|
||||
cmd_?: mov si, .txt
|
||||
jmp putcs
|
||||
.txt: db "G Go", 0x0A, 0x0D
|
||||
db "H w w Add and subtract two values", 0x0A, 0x0D
|
||||
db "R[r] Print register values", 0x0A, 0x0D
|
||||
db "T Single-Step", 0x0A, 0x0D
|
||||
db 0
|
||||
|
||||
114
rom/debug.asm
114
rom/debug.asm
|
|
@ -1,114 +0,0 @@
|
|||
cpu 8086
|
||||
org 0x0000
|
||||
|
||||
; interrupt vector we store addr of data segment in
|
||||
bssvec: equ 0xB6
|
||||
|
||||
db 0x55, 0xAA
|
||||
db 0x00
|
||||
jmp near init
|
||||
|
||||
times (0x18 - ($-$$)) db 0
|
||||
dw 0
|
||||
dw pnp
|
||||
|
||||
pnp: db "$PnP"
|
||||
db 1 ; version 1
|
||||
db 2 ; 2 * 16 length
|
||||
dw 0 ; offset of next header
|
||||
db 0
|
||||
db 0 ; checksum (filled by fix-rom)
|
||||
dd 0 ; device identifier
|
||||
dw 0 ; manufacturer string
|
||||
dw 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
|
||||
zero: dw 0
|
||||
|
||||
name: db "rdos debug", 0
|
||||
|
||||
init: push ds
|
||||
push ax
|
||||
push cx
|
||||
|
||||
; DS := 0
|
||||
xor ax, ax
|
||||
mov ds, ax
|
||||
; allocate a single kilobyte from end of lowmem
|
||||
dec word [0x413]
|
||||
; calculate segment from kilobytes
|
||||
mov ax, [0x413]
|
||||
mov cl, 6
|
||||
shl ax, cl
|
||||
; store ptr to our data segment in B6h vector
|
||||
mov word [bssvec*4], ax
|
||||
; set entry points vectors
|
||||
mov word [1*4], int3entry
|
||||
mov word [1*4+2], cs
|
||||
mov word [3*4], int3entry
|
||||
mov word [3*4+2], cs
|
||||
|
||||
pop cx
|
||||
pop ax
|
||||
pop ds
|
||||
retf
|
||||
|
||||
; Expects DI to mark end of command
|
||||
runcmd: mov si, inbuf
|
||||
lodsb
|
||||
cmp al, 'G'
|
||||
je cmd_g
|
||||
cmp al, 'H'
|
||||
je cmd_h
|
||||
cmp al, 'R'
|
||||
je cmd_r
|
||||
cmp al, 'T'
|
||||
je cmd_t
|
||||
cmp al, '?'
|
||||
je cmd_?
|
||||
cerr: mov al, '?'
|
||||
call putc
|
||||
jmp crlf
|
||||
|
||||
%include "debug/chario.asm"
|
||||
%include "debug/parse.asm"
|
||||
%include "debug/names.asm"
|
||||
|
||||
%include "debug/edit.asm"
|
||||
%include "debug/run.asm"
|
||||
%include "debug/util.asm"
|
||||
%include "debug/asm.asm"
|
||||
|
||||
align 512
|
||||
|
||||
absolute 0
|
||||
reg_ax: resw 1
|
||||
reg_cx: resw 1
|
||||
reg_dx: resw 1
|
||||
reg_bx: resw 1
|
||||
reg_sp: resw 1
|
||||
reg_bp: resw 1
|
||||
reg_si: resw 1
|
||||
reg_di: resw 1
|
||||
|
||||
reg_es: resw 1
|
||||
reg_cs: resw 1
|
||||
reg_ss: resw 1
|
||||
reg_ds: resw 1
|
||||
|
||||
reg_ip: resw 1
|
||||
reg_fl: resw 1
|
||||
|
||||
ingetc: resw 1
|
||||
inmin: resb 1
|
||||
inmax: resb 1
|
||||
inbuf: resb 0x20
|
||||
|
||||
; reserve at least 80h words for stack
|
||||
resw 0x80
|
||||
alignb 1024
|
||||
stack:
|
||||
Loading…
Reference in New Issue