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On Mon, 2013-06-17 at 16:24 +0200, Holger Brunck wrote: > I am using systemtap userspace probes on a 32-Bit powerpc architecture. I do > crosscompile the probes on a 64-Bit x86 host. > > The version I use is: > Systemtap translator/driver (version 2.3/0.152, non-git sources) > > If I use print_ubacktrace() in my stap script it won't compile. I am getting two > main error messages and I ask myself which one tells me the real reason for the > error: > > backtraces for 32bit programs on 64bit kernels don't work. Yes, if your powerpc kernel is 64bit, but the user program is 32bit (same for 32bit user space on x86_64) then you will get that warning during stap translation time (the stap script should still run, but won't produce a user backtrace for the 32bit module/library/process). This is bug: http://sourceware.org/bugzilla/show_bug.cgi?id=10272 "backtraces fail with 32-on-64 executables" > systemtap-2.3-32645/share/systemtap/runtime/stack.c:85:2: error: #error > "Unsupported architecture" This might be caused by the cross compiling, maybe something got confused about the architecture. You get that when: #ifndef STP_USE_DWARF_UNWINDER powerpc (and x86_64) both should use the DWARF_UNWINDER. So you might want to look at why that doesn't get defined in your case. Cheers, Mark
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