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Add instructions how to debug NativeAOT exceptions on the ARM64 #112006

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Add instructions how to debug NativeAOT exceptions on the ARM64 #112006

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Add instructions how to debug NativeAOT exceptions on the ARM64
kant2002 Jan 30, 2025
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Update src/coreclr/nativeaot/docs/debugging.md
kant2002 Jan 30, 2025
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2 changes: 1 addition & 1 deletion src/coreclr/nativeaot/docs/debugging.md
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Expand Up @@ -12,4 +12,4 @@ You can launch a NativeAOT-compiled executable under the VS debugger by opening

To set a breakpoint that breaks whenever an exception is thrown, choose the `Breakpoints` option from the `Debug` -> `Windows` menu. In the new window, select `New` -> `Function breakpoint`. Specify `RhThrowEx` as the Function Name and leave the Language option at "All Languages" (do not select C#).

To see what exception was thrown, start debugging (`Debug` -> `Start Debugging` or `F5`), open the Watches window (`Debug` -> `Windows` -> `Watch`) and add following expression as one of the watches: `(S_P_CoreLib_System_Exception*)@rcx`. This leverages the fact that at the time `RhThrowEx` is called, the x64 CPU register RCX contains the thrown exception. You can also paste the expression into the `Immediate Window`; the syntax is the same as for watches.
To see what exception was thrown, start debugging (`Debug` -> `Start Debugging` or `F5`), open the Watches window (`Debug` -> `Windows` -> `Watch`) and add following expression as one of the watches: `(S_P_CoreLib_System_Exception*)@rcx` on x64, or `(S_P_CoreLib_System_Exception*)x0` on ARM64. This leverages the fact that at the time `RhThrowEx` is called, the registers RCX and X0 contain the thrown exception, on x64 and ARM64, respectively. You can also paste the expression into the `Immediate Window`; the syntax is the same as for watches.