What platform are you on? fetch_proc_info() should auto-detect signal frame and set use_prev_instr accordingly using the (kernel-provided) frame annotations detected in parse_cie(). I don't know if that works for anything but linux (and possibly x86_64 only at that). Looks like there may be some support for freebsd.
On Thu, Mar 23, 2017 at 8:45 PM, Doug Moore <[email protected]> wrote: > When unw_init_local uses common_init to set use_prev_instr, and then > fetch_proc_info decrements ip, based on use_prev_instr, unw_step fails for > me. > > I’m putting a temp break point at the start of _dl_runtime_resolve, and > when gdb gets there, I’m sending a signal to trigger a signal handler that > invokes unw_step. What happens, sadly, is that the instruction pointer is > decremented, so the eh_frames search doesn’t find the right frame, so the > step fails. > > If only I could clear that use_prev_instr field. So far, I don’t have any > better choices than to hack the libunwind source and maintain my own local > branch. Are there any better ideas? > > Doug > _______________________________________________ > Libunwind-devel mailing list > [email protected] > https://lists.nongnu.org/mailman/listinfo/libunwind-devel >
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