QEMU: Difference between revisions

QEMU does not require the use of a configuration script like Bochs. An example usage of QEMU can be seen below:

 

qemu-system-i386 \

-accel tcg,thread=single \

-usb \

-vga std

 

When running QEMU on a non-UNIX system, it may be necessary to use the <tt>-L</tt> command-line option to instruct QEMU where to find a BIOS image.

 

It is possible to redirect QEMU's monitor output to stdio using the following command-line option when invoking QEMU:

-monitor stdio

 

 

For convenience, it is also possible to create a file containing commands for GDB to automatically execute. GDB will read and execute the contents of a file with the name <tt>.gdbinit</tt> in the current working directory. Alternatively, a different file may be specified by the use the <tt>-command=file</tt> command-line argument. An example file can be seen below:

 

file <my-kernel-binary>

target remote localhost:1234

# Inspect page tables

x /8wg &page_tables_start

 

This will automatically load the kernel binary's symbol file into the debugger and then open the remote connection to QEMU.<br/>

 

Some files within the QEMU source code have commented lines of the form:

// #define DEBUG_*

 

Recompiling QEMU from source with this preprocessor variable defined will cause additional debugging information from the applicable file to be printed to stdout.