Re: [PATCH 7/7] DWARF: add the config option

[Josh Poimboeuf]

> How are you handling control flow?

Control flow of what?

> > Here's the struct in its current state:
> > 
> > 	#define UNDWARF_REG_UNDEFINED		0
> > 	#define UNDWARF_REG_CFA			1
> > 	#define UNDWARF_REG_SP			2
> > 	#define UNDWARF_REG_FP			3
> > 	#define UNDWARF_REG_SP_INDIRECT		4
> > 	#define UNDWARF_REG_FP_INDIRECT		5
> > 	#define UNDWARF_REG_R10			6
> > 	#define UNDWARF_REG_DI			7
> > 	#define UNDWARF_REG_DX			8
> > 
> 
> Why only those registers?  Also, if you have the option I would really
> suggest using the actual x86 register numbers (ax, ex, dx, bx, sp, bp,
> si, di, r8-r15 in that order.)

Those are the only registers which are ever needed as the base for
finding the previous stack frame.  99% of the time it's sp or bp, the
other registers are needed for aligned stacks and entry code.

Using the actual register numbers isn't an option because I don't need
them all and they need to fit in a small number of bits.

This construct might be useful for other arches, which is why I called
it "FP" instead of "BP".  But then I ruined that with the last 3 :-)

-- 
Josh