Linux kernel source tree https://git.amat.us/linux/atom/arch/xtensa/kernel/stacktrace.c?h=v3.13.2 2013-05-09T08:07:10Z 2013-05-09T08:07:10Z Max Filippov jcmvbkbc@gmail.com 2013-04-07T21:29:19Z urn:sha1:3ae908c99e944a7a5c4f4b2d8c603a6bc57b728b Definition of CALLER_ADDR* through __builtin_return_address makes compiler insert calls to __xtensa_libgcc_window_spill, which in turn makes fast_syscall_spill_registers syscall that clobbers registers when called from the kernel mode, leading to invalid opcode exceptions on return to userspace. Provide definition for CALLER_ADDR0 as MAKE_PC_FROM_RA(a0, a1) and in case CONFIG_FRAME_POINTER is enabled extract CALLER_ADDR{1-3} from stack. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Chris Zankel <chris@zankel.net> 2013-05-09T08:07:10Z Max Filippov jcmvbkbc@gmail.com 2013-04-15T05:20:48Z urn:sha1:3e4196a5cc9cff50900f3dc8acc3d41e5963fd50 Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Chris Zankel <chris@zankel.net>