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this_id - Given a frame, return a unique identifier for the caller's frame based on the caller's frame base address and the calling functions entry point. prev_register - Given a frame, return the value of a specified register as it was on entry to this function (registers that are known to be saved on the stack)
Question - what registers is gdb expecting prev_register to give reasonable results for? Just PC? Or SP and FP as well?
As many as possible. This _completely_ replaces all other unwinding,
for instance frame_chain and the extra_info/saved_registers data. Might want to take a look at the ARM conversion I just posted; I don't
promise it's right...
Question - reading through this again I think the goal of call these functions is to work with the current frame and the function get passed the child frame so they can do a backtrace if it hasn't already been done... why not call a function to do a 1 level backtrace and then eliminate the next_frame parameter? It would recduce confusion and most ports will have an internal unwind function anyway.
Because it doesn't make much difference, I think. The key is that the info generated when doing the backtrace is target specific, and opaque.
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