Selftest: Forward unicorn error message when emulation fails

When the selftest fails with an emulation failure in unicorn, we would
previously not print any information hinting at the underlying problem.

This commit improves debuggability by printing the UcError exception
thrown by Unicorn.

Signed-off-by: Hanno Becker <[email protected]>

slothy/helper.py

@@ -1334,11 +1334,11 @@ def run_code(code, txt=None):
                     mu.emu_start(CODE_BASE + offset, CODE_BASE + len(objcode))
                 else:
                     mu.emu_start(CODE_BASE + offset, CODE_END)
-            except:
+            except UcError as e:
                 log.error("Failed to emulate code using unicorn engine")
                 log.error("Code")
                 log.error(SourceLine.write_multiline(code))
-                raise SelfTestException("Selftest failed: Unicorn failed to emulate code")
+                raise SelfTestException(f"Selftest failed: Unicorn failed to emulate code: {str(e)}") from e
 
             final_register_contents = {}
             for r in regs: