U /10 disassembles 10 instructions starting from the current address. U/disasm/disassemble start end, disassemble the instruction of a given linear address range Modify the contents of the register, except for the segment register and the flag register, other registers can be modified.Īll CPU status information, including each segment selector (cs, ds, etc.), ldtr, gdtr, etc. (4) Information display and CPU register operation commands T(binary) is displayed as a binary numberĬ(char) is displayed as the corresponding character U(unsigned) is displayed as an unsigned decimal number X(hex) is displayed as a hexadecimal numberĭ(decimal) is displayed as a decimal number U represents the unit size, the default value is wį is the display format, the default value is x Then do sleep 1000000 in the com1 window to keep the shell from messing with things, and run bochs in the other.
Find out the tty the com1 window using the tty command, and use that as the dev parameter. One of them will run bochs, and the other will act as com1.
#RUN BOCHS IN DEBUG WINDOWS#
N is the count value of the display memory unit, the default is 1 To use a pty (under X/Unix), create two windows (xterms, usually).
The parameters n, u, f respectively represent: Stop execution and return to the command line promptĬheck the memory content at the linear address addrĬheck the memory content at the physical address addr Set a breakpoint on the linear address, addr is the same as aboveĭisplay information about all current breakpointsĮxecute count instructions, the default is 1, and will follow up to the content of the function and interrupt callĮxecute count instructions, the default is 1, but skip function and interrupt calls Set instruction breakpoints on virtual addresses, where seg and offset can be hexadecimal numbers starting with 0x, or decimal, or octal numbers starting with 0 The basic commands of bochs are roughly divided into the following categories The red string "Hello, OS World!" will appear on the final interfaceħ. Execute the command bochs -f bochsrc, it will pause in the BIOS and wait for debuggingĪt this time, you can set a breakpoint, the physical address is 0x7c00, and use various debugging commands of bochs to view the running situation. Vgaromimage: file=/usr/share/bochs/VGABIOS-lgpl-latestĦ. Romimage: file=/usr/share/bochs/BIOS-bochs-latest Create a configuration file bochsrc for bochs startup, with the following content: Use the dd command to write boot.bin into the first sector of the floppy disk image disk.imgĭd if=boot.bin of=disk.img bs=512 count=1 conv=notruncĥ.
#RUN BOCHS IN DEBUG CODE#
Times 510-($-$$) db 0 fill the remaining space so that the generated binary code is exactly 512 bytesĤ. Mov bx,000ch The page number is 0 (bh = 0) Red letters on black background (bl = 0Ch, highlight) Org 07c00h Tell the compiler that the program is loaded to memory address 07c00hĬall DispStr call the display string routine
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