![]() ![]() That sometimes the next line to be executed may be further down below the lines being displayed. To live with that unless you could possibly help develop a better display?! There's also a little quirk when stepping and especially 'proceeding' through the code, PLEASE NOTE: The author is well-aware of the fact that resizing this GUI Debugger "window" can be a real pain to work with, sinceĮach column and section inside the window must be re-sized separately, and changing the size of the whole window may affect each of the column sizes! We'll just have Record code (located on the first sector of a PC's hard disk or in this case, in the DLX Linux image file running under Bochs): This next view shows the "Bochs Enhanced Debugger" about to step through the DLX Linux's LILO Master Boot ![]() Now when you run GUIdebug.bat, the Enhanced (Color) (The quote marks must be included.) Now make a COPY of the debug.bat file, change its name to GUIdebug.bat and edit that fileīy changing the file name bochsrc.bxrc inside it to: GUIdebug.bxrc. Then underneath those two commented lines, add this required un-commented line:ĭisplay_library: win32, options="gui_debug" Symbol is inactive and taken only as a comment. # other choices: win32 sdl wx carbon amigaos beos macintosh nogui rfb term svga Now open that new file in NOTEPAD (right-clicking on this file might give you an "Edit" choice), and searchįor these two lines inside the file: #display_library: x In order to use the GUI form of the Bochs Debugger, first make a COPY of the bochsrc.bxrc file in the " \dlxlinux\" folderĪnd change its name to GUIdebug.bxrc. Or 32-bit) or "long" (64-bit) modes, so could be very Switches to "real" (16-bit), "protected" (16. Proceed (or "Step-Over" ) very useful for quicklyĮxecuting subroutines and especially BIOS Interrupts!īreaksexecution at a mode change that is, whenever Set a linear address instruction breakpoint Stop execution, and return to command line prompt ![]() ( Step): execute count instructions default is 1. Most important commands here (including one of the most important commands still left UN-documented: The p or proceed To get you started, we've highlighted some of the %USERNAME% in the URL box of your web browser with your own username) which comes with the Bochs download. Using Bochs internal debugger you must replace Instruction each time.) Here we executed two more instructions arriving at Linear Memory Location 0x7c72:Ĭommands which can be used in both the Console and GUI Debuggers can be found in the documentation (see 8.14. Was entered, so you only need to ENTER the 's' command one time, then simply press the ENTER key each time after that to keep executing a single Assembly (Note: All subsequent presses of the ENTER key will do the same thing as the previous command that Following that we entered an " s"Ĭommand to begin single-stepping through the code. Which is where the BIOS loads the Master Boot Record from Sector 0 of the first hard disk, or the first boot instruction from a CDROM/DVD or USB drive.Īfter entering the appropriate commands (" lb 0x7c00" and " c" to continue), theīochs Debugger stops just before executing the first instruction of the DLX Linux image file. NOTE: In order to pause the execution of the DLX Linux image file (or your own boot code) at its very first assembly instruction (as shown in the pictureīelow), you need to set a "linear breakpoint" ( lb) in Memory at the linear location of 7c00 (Enter: lb 0x7c00) Until UEFI boot code on 64-bit machines): Note that the same exact binary code (for this assembly instruction) can be found in virtually every PC's BIOS chip (well, The Bochs " Display" window will remain empty at this time, but you will see the following in the Bochs " Console" as it always pauses (technically, it's called a BREAK) at the first instruction of its own BIOS code whenever running bochsdbg.exe. So it will execute the bochsdbg.exe program instead. NOTEPAD or NotePad ) by changing the line ". Now make a copy of the dlxlinux folder's run.bat file in the same folder and rename it debug.bat. Menu), then in the "Shortcut" TAB of Properties, click the "Open File Location" button: Or, if this shortcut icon is on your Desktop, simply RIGHT-click on it and choose "Properties" (all the way at the bottom of the pop-up ![]()
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