493 lines
13 KiB
NASM
493 lines
13 KiB
NASM
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PAGE ,132
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TITLE DXBUG.ASM -- Dos Extender Debug Services
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; Copyright (c) Microsoft Corporation 1989-1991. All Rights Reserved.
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;****************************************************************
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;* *
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;* DXBUG.ASM - Dos Extender Debug Services *
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;* *
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;****************************************************************
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;* *
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;* Module Description: *
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;* *
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;* This module contains protect mode debug services for the *
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;* DOS extender. *
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;* *
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;****************************************************************
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;* Revision History: *
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;* *
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;* 11/17/89 Jimmat Added TraceBug stuff for debugging on *
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;* 286 machines. *
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;* 03/09/89 JimMat Initial version. *
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;* *
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;****************************************************************
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.286p
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.287
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ifndef DEBUG
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DEBUG = 0
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endif
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; -------------------------------------------------------
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; INCLUDE FILE DEFINITIONS
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; -------------------------------------------------------
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include segdefs.inc
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include gendefs.inc
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include pmdefs.inc
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if DEBUG ;********** ENTIRE FILE IS DEBUG CODE ***********
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; -------------------------------------------------------
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; DATA SEGMENT DEFINITIONS
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; -------------------------------------------------------
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DXDATA segment
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extrn fDebug:BYTE
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extrn fTraceBug:WORD
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;******************************************************************************
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;
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; DXOutputDebugStr
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;
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; Basically stolen from Windows/386 code by Ralph Lipe -- hacked up for
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; 286 instead of 386. Here in RalphL's own words is the description:
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;
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; DESCRIPTION:
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; The following code is not pretty but it does what it needs to. It will
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; only be included in DEBUG versions of Win386. It accepts an ASCIIZ
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; string which it will output to the COM1 serial port. If the string
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; contains #(Register) (for example #AX) then the value of that register
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; will be output. It will not work for segment registers.
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;
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; If the string contains ?(Register)[:(Register)] (for example ?AX or
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; ?AX:BX) then the value of the register(s) is passed to the debugger
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; to display the label nearest to the given address. (It, also, will
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; not work with segment registers. If ?AX is given, then the segment is
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; assumed to be the DX code segment.
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;
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; ENTRY:
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; DS:SI -> ASCIIZ string
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;
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; EXIT:
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; All registers and flags trashed
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;
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; ASSUMES:
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; This procedure was called by the Trace_Out macro. It assumes that
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; the stack is a pushad followed by a FAR call to this procedure.
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;
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;------------------------------------------------------------------------------
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Reg_Offset_Table LABEL WORD ; Order of PUSHA
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dw "DI"
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dw "SI"
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dw "BP"
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dw "SP"
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dw "BX"
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dw "DX"
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dw "CX"
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dw "AX"
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DXDATA ends
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DXCODE segment
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assume cs:DXCODE
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public DXOutDebugStr
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DXOutDebugStr proc far
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push bp
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mov bp, sp ; Assumes BP+6 = Pusha
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pushf
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push es
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push SEL_DXDATA ; Address our own data seg
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pop es
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assume ds:NOTHING,es:DGROUP
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cld
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cli
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OSC1_Loop:
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lodsb ; Get the next character
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test al, al ; Q: End of string?
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jz short OSC1_Done ; Y: Return
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cmp al, "#" ; N: Q: Special register out?
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je SHORT OSC1_Hex ; Y: Find out which one
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cmp al, "?" ; Q: special lable out?
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je short OSC1_Label ; Y: find out which one
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cmp al, "@" ; Q: special string out?
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je short OSC1_Str
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OSC1_out:
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xor ah, ah ; N: Send char to COM
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call Out_Debug_Chr
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jmp OSC1_Loop ; Loop until done
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OSC1_Hex:
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call Get_Register
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jnc short OSC1_not_special
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cmp bl, 2 ; Q: Word output?
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jb SHORT OSC1_Out_Byte ; N: display byte
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OSC1_Out_Word:
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call Out_Hex_Word ; Display AX in hex
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jmp OSC1_Loop ; Output next char
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OSC1_Out_Byte:
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xchg al, ah ; swap bytes to print just
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call Out_Hex_Byte ; the low one!
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jmp OSC1_Loop ; Output next char
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OSC1_Label:
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call Get_Register
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jc short show_label
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OSC1_not_special:
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lodsb ; Get special char again
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jmp OSC1_out ; display it, and continue
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show_label:
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mov cx, ax ; save first value
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cmp byte ptr [si], ':' ;Q: selector separator?
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jne short flat_offset ; N:
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lodsb ; Y: eat the ':'
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call Get_Register ; and attempt to get the selector
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jc short sel_offset
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flat_offset:
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mov ax, cs ; default selector value
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sel_offset:
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call Show_Near_Label
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jmp OSC1_Loop
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OSC1_Str:
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call Get_Register
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jnc short OSC1_not_special
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mov cx,ax
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cmp byte ptr [si],':'
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jne short no_selector
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lodsb
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push cx
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call Get_Register
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pop cx
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xchg ax,cx
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jc short got_sel_off
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mov cx,ax
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no_selector:
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mov ax,ds ; default selector for strings
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got_sel_off:
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call Show_String
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jmp OSC1_Loop
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OSC1_Done: ; The end
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pop es
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npopf
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pop bp
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ret 10h
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DXOutDebugStr endp
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;******************************************************************************
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;
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; Get_Register
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;
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; DESCRIPTION:
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;
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; ENTRY:
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;
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; EXIT: Carry set if register value found
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; AX = register value
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; BL = value size (1, 2, 4)
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;
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; USES:
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;
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;==============================================================================
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Get_Register proc near
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push si ; Save string pointer
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xor ax, ax ; Zero AX
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mov bl, 2 ; BL = 2 (assume word output)
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call Load_Up_Char ; Get 1st char
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mov ah, al ; Move 1st char to AH
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call Load_Up_Char ; Get second char
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cmp al, 'L' ; Q: "L" (ie AL, BL, etc)?
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jne short OSC1_WORD ; N: word reg
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mov al, 'X' ; Y: change to X for pos match
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mov bl, 1 ; BL = 1 -- byte output
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OSC1_WORD:
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xor di, di ; DI = 0
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mov cx, 8 ; Size of a pusha
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OSC1_Special_Loop:
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push di
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shl di,1
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cmp ax, Reg_Offset_Table[di] ; Q: Is this the register?
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pop di
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je SHORT OSC1_Out_Reg ; Y: Output it
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inc di ; N: Try the next one
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loop OSC1_Special_Loop ; until CX = 0
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OSC1_Ignore_Special: ; OOPS! backup and ignore special
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pop si ; Restore original string ptr
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dec si ; back up to special char
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clc
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jmp short gr_exit
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OSC1_Out_Reg:
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push di
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shl di,1
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mov ax, SS:[bp.6][di] ; AX = Value to output
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pop di
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add sp, 2 ; Trash pushed SI
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cmp bl, 2 ;Q: byte or word value?
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je short value_fnd ; jump if word value
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xor ah, ah ; clear ah, if byte value
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value_fnd:
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stc
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gr_exit:
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ret
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Get_Register endp
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;******************************************************************************
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;
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; Load_Up_Char
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;
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; Moves the character at DS:SI into AL and converts it to an upper case
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; character. SI is incremented.
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;
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;------------------------------------------------------------------------------
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Load_Up_Char proc near
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lodsb
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cmp al, "Z"
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jb SHORT LUC_Done
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sub al, "a" - "A"
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LUC_Done:
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ret
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Load_Up_Char endp
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;******************************************************************************
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;
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; Out_Hex_Word
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;
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; Outputs the value in AX to the COM port in hexadecimal.
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;
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;------------------------------------------------------------------------------
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Out_Hex_Word proc near
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rol ax, 4
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call Out_Hex_Char
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rol ax, 4
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call Out_Hex_Char
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Out_Hex_Byte:
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rol ax, 4
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call Out_Hex_Char
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rol ax, 4
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call Out_Hex_Char
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ret
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Out_Hex_Word endp
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;******************************************************************************
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;
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; Out_Hex_Char
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;
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; Outputs the low nibble in AL to the COM port.
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;
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;------------------------------------------------------------------------------
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DXDATA segment
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Hex_Char_Tab LABEL BYTE
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db "0123456789ABCDEF"
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DXDATA ends
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Out_Hex_Char proc near
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push ax
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push bx
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mov bx, ax
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and bx, 1111b
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mov al, Hex_Char_Tab[bx]
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call Out_Debug_Chr
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pop bx
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pop ax
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ret
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Out_Hex_Char endp
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;******************************************************************************
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;
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; Out_Debug_Chr
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;
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; DESCRIPTION:
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;
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; ENTRY:
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; AL contains character to output
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;
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; EXIT:
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;
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; USES:
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; Nothing
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;
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;==============================================================================
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Out_Debug_Chr proc near
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assume ds:nothing,es:DGROUP
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if 0
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push ax
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mov ax,cs
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cmp ax,SEL_DXCODE0 ; Are we in real mode?
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pop ax
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jne out_com
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cmp fDebug,0 ; debugger installed?
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je out_com ; N: go output it ourselves
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push ax
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push dx
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mov dl, al
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mov ax, DS_Out_Char
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int Debug_Serv_Int
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pop dx
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pop ax
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endif
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ret
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Out_Debug_Chr endp
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;******************************************************************************
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;
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; Show_Near_Label
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;
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; DESCRIPTION: call the debugger to display a label less than or equal
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; to the given address
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;
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; ENTRY: AX is selector, CX is offset of address to try to find
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; a symbol for
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; ES selector to DOSX data segment
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; EXIT:
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;
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; USES:
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;
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;==============================================================================
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Show_Near_Label proc near
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if 0
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push ax
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mov ax,cs
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cmp ax,SEL_DXCODE0 ; Are we in real mode?
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pop ax
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jne Show_Near_Label_ret
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cmp es:idCpuType,3 ;use 32 bit regs?
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jae debug_386
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push ax ;on a 286, use 16 bit regs
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push bx
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push cx
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mov bx,cx
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mov cx,ax
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mov ax,DS_Out_Symbol
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int Debug_Serv_Int
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pop cx
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pop bx
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pop ax
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endif
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ret
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if 0
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debug_386:
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.386p
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push eax
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push ebx
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push ecx
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mov bx, cx
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movzx ecx, ax ;WDEB386 wants a 32 bit offset
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mov ax, DS_Out_Symbol
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int Debug_Serv_Int
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pop ecx
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pop ebx
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||
|
|
pop eax
|
||
|
|
ret
|
||
|
|
|
||
|
|
.286p
|
||
|
|
|
||
|
|
Show_Near_Label_ret:
|
||
|
|
endif
|
||
|
|
|
||
|
|
Show_Near_Label endp
|
||
|
|
|
||
|
|
|
||
|
|
;******************************************************************************
|
||
|
|
;
|
||
|
|
; Show_String
|
||
|
|
;
|
||
|
|
; DESCRIPTION: Display an asciiz string
|
||
|
|
;
|
||
|
|
; ENTRY: AX is selector, CX is offset of address to find string
|
||
|
|
;
|
||
|
|
; EXIT:
|
||
|
|
;
|
||
|
|
; USES:
|
||
|
|
;
|
||
|
|
;==============================================================================
|
||
|
|
|
||
|
|
Show_String proc near
|
||
|
|
|
||
|
|
if 0
|
||
|
|
push ax
|
||
|
|
push ds
|
||
|
|
push si
|
||
|
|
|
||
|
|
mov ds,ax
|
||
|
|
mov si,cx
|
||
|
|
xor ax,ax
|
||
|
|
@@:
|
||
|
|
lodsb
|
||
|
|
or al,al
|
||
|
|
jz @f
|
||
|
|
call Out_Debug_Chr
|
||
|
|
jmp short @b
|
||
|
|
@@:
|
||
|
|
pop si
|
||
|
|
pop ds
|
||
|
|
pop ax
|
||
|
|
endif
|
||
|
|
|
||
|
|
ret
|
||
|
|
|
||
|
|
Show_String endp
|
||
|
|
|
||
|
|
|
||
|
|
DXCODE ends
|
||
|
|
|
||
|
|
endif ; DEBUG
|
||
|
|
|
||
|
|
end
|