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The Call handler is the asm interpreter's hot path for inline JS-to-JS dispatch, and it carries roughly fifty distinct named values across its body (callee object, packed metadata word, formal/passed/total counts, two stack-side pointers, the argument-copy cursor, the script-or-module pair-load scratch, the native return value and variant tag, ...). The native-exception path adds a small `mov helper_arg, native_return` bridge between call_raw_native (output pinned to rax by fixed_operands) and call_helper (input pinned to rcx by fixed_operands), since the two ABIs land their values in different registers and the explicit mov is the cleanest way to express the hand-off.