On Sat, Jan 12, 2019 at 02:45:41AM -0600, Segher Boessenkool wrote: > On Sat, Jan 12, 2019 at 12:09:14PM +1100, Balbir Singh wrote: > > Could you please define interesting frame on top a bit more? Usually > > the topmost return address is in LR > > There is no reliable way (other than DWARF unwind info) to find out where > the value of LR at function entry currently lives (if anywhere). It may or > may not be still available in LR, it may or may not be saved to the return > stack slot. It can also live in some GPR, or in some other stack slot. > > (The same is true for all other registers). > > The only thing the ABI guarantees you is that you can find all stack frames > via the back chain. If you want more you can use some heuristics and do > some heroics (like GDB does), but this is not fully reliable. Using DWARF > unwind info is, but that requires big tables. > Thanks, so are you suggesting that a reliable stack is not possible on ppc64le? Even with the restricted scope of the kernel? Balbir Singh.
