On 08/28/2018 07:13 AM, Jeff Law wrote: > Please consider using function descriptors rather than trampolines. > This allows you to make the stack non-executable at all times which is > good from a security standpoint. The downside is the indirect calling > mechanism has to change slightly to distinguish between a simple > indirect call and one through a function descriptor (usually by having a > low bit on to indicate the latter). GIven this is an ABI change, now is > probably the last opportunity to make this change.
Correct me if I'm wrong here: Define TARGET_CUSTOM_FUNCTION_DESCRIPTORS to an appropriate value -- easy for a RISC target -- and that's it. Further, it pretty much only gets used by the Ada front end. One should not expect these to be used by the C front end nested functions. r~
