James Molloy wrote: > Hi, > > I'm attempting to write a cross-platform debugger for a hobby kernel, > and as part of which I use DWARF-2's CFI stack unwinding functionality. > > This works perfectly, however I would also like to obtain the parameters > given to each function call on the stack. I can do this easily in x86 as > all the parameters are passed via stack, however on x64 and MIPS I'm > having difficulty, as the first X parameters are passed via register. > > The DWARF-2 specification makes allowance for this - the CFI system is > capable of determining the value of any and every register at the start > of any stack frame - but I have noticed that GCC doesn't record > unwinding rules for many registers (seemingly any register not essential > to the finding of the CFA or return address). > > Is there any flag available to enable recording of every register, or, > even better, certain registers, for every stack frame? I've grepped the > manual to no avail. Surely this is in the debuginfo, not the unwinder data. Aren't you looking in the wrong place? Andrew.
