On Mon, 2015-06-29 at 11:10 +0100, Richard Henderson wrote: > > OK, I think I have this part of the code working on MIPS but > > crtl->drap_reg is used in the epilogue as well as the prologue even if > > it is not 'live' in between. If I understand the code correctly the x86 > > prologue pushes the drap register on to the stack so that the epilogue > > can pop it off and use it to restore the stack pointer. Is my > > understanding correct? > > Yes. Although that saved copy is also used by unwind info.
Do you know how and where this saved copy is used by the unwind info? I don't see any indication that the unwind library knows if a stack has been dynamically realigned and I don't see where unwind makes use of this value. Steve Ellcey sell...@imgtec.com
