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This finishes a cleanup I started in late 2014, when I moved most of the low-level assembly code to C/C++. The saved-register structs use the same stack and register layout trick the x86 code has used since then. I also had a prototype using pseudo-naked functions for the remaining entry code several years ago, but this is much nicer now that GCC supports naked functions.
Move the remaining boot and interrupt entry code from
.Sfiles to C/C++. This lets the entry paths call C/C++ directly and makes the stack layouts visible as C structs. Where GCC ignoresnaked, use a computed pseudo-naked entry point.Also add synthetic stack frames on x86 so kernel backtraces continue at the instruction which was interrupted.
This removes the last
.Sfiles from the tree.The page-fault diagnostics and interrupt backtrace frames included here are split out from Florian Kargl's #287.