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. Segher
