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To retrieve register values in Gem5, follow these steps:

1. Start Gem5 in debug mode by using the command "build/ARM/gem5.opt --debug-flags=Exec" (replace ARM with the architecture you are simulating).

2. Set a breakpoint at the location in the code where you want to retrieve the register values by using the command "breakpoint <location>". For example, if you want to retrieve the register values at the start of the main function, you would use the command "breakpoint main".

3. Run the simulation by using the command "run".

4. When the breakpoint is hit, use the command "info registers" to display the contents of all the registers.

5. Alternatively, you can use "info register <register-name>" to display the contents of a specific register. For example, "info register x0" will display the contents of the x0 register.

6. You can continue the simulation by using the "continue" command, and the register values will be displayed each time the breakpoint is hit.

That's it! This process will allow you to retrieve register values in Gem5.