Kernel Debugging: Difference between revisions
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Rough import from osfaq |
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There are a number of virtual machines that can simulate x86 machines, my favorite is Bochs |
There are a number of virtual machines that can simulate x86 machines, my favorite is Bochs |
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(http://bochs.sourceforge.net). Bochs is capable of setting breakpoints in any kind of software |
(http://bochs.sourceforge.net). Bochs is capable of setting breakpoints in any kind of software |
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(even if it is compiled without debugging info!), and provides an additional "debugging |
(even if it is compiled without debugging info!), and provides an additional "debugging <tt>out</tt> |
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port" you can easily access from within your kernel code to print debug messages. |
port" you can easily access from within your kernel code to print debug messages. |
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For example, you don't have to reboot to test your new OS, you just start the VM. |
For example, you don't have to reboot to test your new OS, you just start the VM. |
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Another virtual machine called Simics (https://www.simics.net) is capable not only of breakpoints and displaying register information, but it is also capable of opening a port for use with debugging with DDD (the simics command is 'gdb-remote'). Using this combination, it is possible to see your C source code as you step through the OS! However, the Bochs virtual machine is much faster at executing the OS than Simics and thus serves as a better virtual machine to |
Another virtual machine called Simics (https://www.simics.net) is capable not only of breakpoints and displaying register information, but it is also capable of opening a port for use with debugging with DDD (the simics command is 'gdb-remote'). Using this combination, it is possible to see your C source code as you step through the OS! However, the Bochs virtual machine is much faster at executing the OS than Simics and thus serves as a better virtual machine to ''run'' the OS, while Simics is the better ''debugger'' for those hard to find problems. |
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== Using a serial null-modem between GDB and your OS == |
== Using a serial null-modem between GDB and your OS == |
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