On Sun, May 07, 2017 at 10:35:28PM -0700, Andy Lutomirski wrote: > I think that, if the code were sufficiently robust, it would be handy > if the unwinder displayed function arguments. DWARF can do that to a > limited extent. Honestly I get the feeling that displaying function arguments wouldn't be realistic (DWARF or no DWARF). On x86-64, arguments are passed in registers, so tracking down their values is a lot more involved than just looking at the stack. The DWARF CFI only shows you the callee-saved registers. To figure out the other registers you'd have to dive into the other DWARF sections and examine previous stack frames for clues. I think it's not a deterministic process, based on how often I see gdb complain with '<value optimized out>'. I'd bet it's a lot harder than a basic stack dump. Also, most kernel functions rely on pointer arguments, which are pretty much useless without dumping the contents of the structs they point to. But then doing that properly would be a whole new level of difficulty. -- Josh -- To unsubscribe from this list: send the line "unsubscribe live-patching" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
