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DOS/32 Advanced DOS Extender - Utility Programs
4.0 - DOS/32 Advanced - SUNSYS Protected Mode Debugger
SUNSYS Protected Mode Debugger is a stand alone debugger program which
allows programmers to debug 16-bit and 32-bit protected mode applications. The
Debugger supports the "LE" and "LX" Linear Executable formats which are used by
WATCOM Linker when creating DOS/4GW protected mode applications.
The usage of SUNSYS Protected Mode Debugger is:
SD <execname.xxx>
where the execname.xxx is the file name of the protected mode application that is
to be debugged.
Additionally, a library version of the Debugger, supplied with DOS/32 Advanced
DOS Extender can be statically linked into your applications. To be able to
use the Debugger library you need to include the line #include <debug.h>
into your source files. Before the Debugger library can be used by your program,
it needs to be activated, which is done by calling the Debug_Init() function
(usually done at the startup of the program). Every
time a breakpoint (placed by a call to DBG() function) in your program is encountered,
the application will break to the debugger, allowing you to debug the code.
The SUNSYS Debugger's user interface consists of a number of windows in which the
debugger displays the information, including disassembled CPU instructions, CPU
registers, memory and stack contents etc. Below is included a short reference of
all the windows, their purpose and the actions that can be performed in them.
CPU 80x86/80x87 Window
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This window displays the disassembled instructions of the code you are
currently debugging.
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Key
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Action
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Description
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ESC
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Repaint Screen
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clear and repaint the screen
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TAB
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Next Window
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switch to the next window
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SHIFT-TAB
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Prev Win
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switch to the previous window
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ALT-X
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Exit Debugger
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exit to DOS
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PRINT SCREEN
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DumpScr
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write the contents of the screen to a file on disk
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ENTER
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New Address
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view the disassembled code at a new address;
addresses preceded by a '.' (point) are treated as
unrelocated addresses, you can also specify a
general register that contains the new address
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1
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switch between the TD- and WD-style text screen
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2
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switch between the 16-bit and 32-bit instructions
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3 or ','
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turn on/off FPU registers shown in Stings Window
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4 or '.'
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turn on/off unrelocated addresses
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ARROWS UP and DOWN
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move the cursor up and down
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ARROWS LEFT and RIGHT
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shift the code by one byte up or down
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PAGE UP and PAGE DOWN
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move the cursor one page up or down
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HOME
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move the cursor to the address held by EIP
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'+' and '-'
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cycle through the selectors in the Memory Window
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F1
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Show Info
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show system information (see below)
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F2
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BreakPoint
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place a hardware breakpoint at the address under the cursor;
the maximum of 3 (three) breakpoints can be active
at the same time
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F3
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Return
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return from subroutine; run until RET, IRET, RETF
or an unconditional JMP instructions, then break to
the debugger
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F4
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Run Here
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run to the address under the cursor
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F5
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User Screen
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switch to the user screen
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F6
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New Address
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skip to cursor; place the address value under the
cursor into the EIP register
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F7
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Trace Into
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single step through the program, stepping into
CALL, LOOP and REP-prefixed instructions
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F8
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Step Over
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single step through the program, stepping over
CALL, LOOP and REP-prefixed instructions
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F9
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Run
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continue execution of the program
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F10
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Step Over Jumps
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single step through the program, stepping over
CALL, LOOP, REP-prefixed and JUMP instructions;
a breakpoint will be placed directly after the
JUMP instruction, allowing you to step over the
Jcc ímplemented loops
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F11
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Search New
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search for an expression; symbol "*" can be used to
indicate the wild-cards, for example: mov ax,[ebx+***]
will match any move to ax from the address pointed
to by ebx plus any other 32-bit general register
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F12
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Search Next
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continue searching for the previously entered string
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System Information (activated by F1 key)
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Shows information about the system, descriptors, interrupts and memory blocks. Use the
ESC key to return to the CPU Window.
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F1
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DPMI information
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F2
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GDT information
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use keys PGUP and PGDOWN to scroll the data in the window
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F3
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IDT information
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use keys PGUP and PGDOWN to scroll the data in the window
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F4
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EMBs Information
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use keys UP, DOWN, PGUP and PGDOWN to scroll the data in the window
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F5
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System Interrupt History
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use keys UP, DOWN, PGUP and PGDOWN to scroll the data in the window;
keys 1, 2, 3 and 4 select a particular interrupt (INT 10h, 21h, 31h and 33h respective),
0 shows all; use the key BACKSPACE to clear the history buffer
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F6
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Buffered Interrupts Information
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use keys: '1' to show INT 10h, '2' to show INT 21h, '3' to show INT 31h, '4' to show INT 33h and '0' to show All
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F10
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DOS Extender and Debugger version
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CPU Registers Window
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In this window will be shown all the CPU general registers, segment registers
and the extended flags.
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Key
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Action
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Description
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ESC
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Return to CPU
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switch back to the CPU Window
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TAB
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Next Window
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switch to the next window
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SHIFT-TAB
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Prev Win
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switch to the previous window
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ALT-X
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Exit Debugger
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exit to DOS
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ENTER
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New Value
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change the value of the selected register; instead of
typing in a number, you can also specify a general
register that contains the new value
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ARROWS UP and DOWN
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move the cursor up and down, select a register
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ARROWS LEFT and RIGHT
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move the cursor left and right, select a register
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PAGE UP and PAGE DOWN
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move the cursor to the next group of registers
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HOME
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move the cursor to the EAX register
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END
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move the cursor to the Carry Flag
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'+' and '-' on keypad
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increment or decrement the selected register's value
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'/' on keypad
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clear the contents of the selected register (reset to 0)
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'*' on keypad
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binary NOT the contents of the selected register (NOT reg)
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Memory Window
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In this window will be displayed the contents of the memory at the specified
address.
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Key
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Action
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Description
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ESC
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Return to CPU
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switch back to the CPU Window
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TAB - Next Window
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Next Window
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switch to the next window
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SHIFT-TAB
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Prev Win
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switch to the previous window
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ALT-X
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Exit Debugger
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exit to DOS
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ENTER
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New Address
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view the memory contents at specified address;
the addresses preceeded by a '.' are treated as
unrelocated addresses; you can also specify a
general register that contains the new address
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'+' and '-' on keypad
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cycle through the selectors: CS, DS, ES, SS, FS and GS
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ARROWS UP and DOWN
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move the cursor up and down
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ARROWS LEFT and RIGHT
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move the cursor left and right
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PAGE UP and PAGE DOWN
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move the cursor one page up or down
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HOME
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move the cursor to the address 0
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Stack Window
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In this window will be displayed the contents of the stack memory at the
addresses specified by the SS:ESP registers.
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Key
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Action
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Description
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ESC
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Return to CPU
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return to the CPU Window
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TAB
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Next Window
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switch to the next window
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SHIFT-TAB
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Prev Win
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switch to the previous window
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ALT-X
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Exit Debugger
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exit to DOS
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ARROWS UP and DOWN
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scroll the contents of the window up and down
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HOME
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move the cursor to SS:[ESP+00] position
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Strings Window
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In this window will be displayed the contents of the memory pointed to by
the registers DS:ESI and ES:EDI. This window cannot be selected and its contents
cannot be modified.
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FPU Registers Window
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This window will show the contents of the Floating Point co-processor. This
window cannot be selected and its contents cannot be modified.
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Copyright © DOS/32 Advanced Team 1996-2002
All Rights Reserved
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