Dear all, I've been working on handling the Debugging information for the use of GDB on my port. Though I definitely know that, when compiling in -O3, some information is lost and the debugger can't always have all the information, I'd like to at least keep the values of the arguments when doing a backtrace. Since my architecture uses register passing for arguments, relatively quickly this is lost since it is not stored on the stack.
Therefore, I would like to, when doing a backtrace, have the argument information. I asked a few clarifications on the GDB mailing list and, it seems, that I need to copy the arguments on the stack (like what is done by default when using -O0). However, when compiling in -O3, the compiler of course removes these stores on the stack and relies solely (and justly so) on the input registers. I've reread the GCC internals and have been looking at anything regarding the stack but can't seem to figure this one out. How exactly do I explain to the compiler that I want to keep those spills to the stack for debugging purposes ? Thanks for your help, Jc
