arm-signal-unwind

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This is a fix to allow correctly unwinding signal frames on ARM EABI, e.g. as result of throwing an exception. Note that catching such exceptions is only reliably possible if:

1. you compile with -fnon-call-exceptions, and
2. the signal is synchronous (e.g. SIGSEGV)

The v1 signal frame format (kernels 2.6.16 and 2.6.17) isn't supported.

Usage: make unwind_sigreturn.o and link the resulting object into your application or library.

To verify the code is working properly in your environment, build and run the test/demo: make check The expected output is something like this: backtrace in segv... ./test(_Z9backtracev+0xd)[0x458f72] ./test(_Z17backtrace_handleri+0xb)[0x458f98] ./test(+0x132a)[0x45932a] ./test(_Z9test_segvf+0x11)[0x458fc6] ./test(_Z3barj+0x13)[0x459048] ./test(_Z3fooj+0x5)[0x45902e] ./test(_Z3barj+0x9)[0x45903e] ./test(_Z3fooj+0x5)[0x45902e] ./test(_Z3barj+0x9)[0x45903e] ./test(_Z3fooj+0x5)[0x45902e] ./test(_Z3barj+0x9)[0x45903e] ./test(_Z3fooj+0x5)[0x45902e] ./test(main+0x10f)[0x459160] /lib/arm-linux-gnueabihf/libc.so.6(__libc_start_main+0x97)[0xb6cddaac] ok

via return (no siginfo)... ok via return (with siginfo)... ok via exception (no siginfo)... ok via exception (with siginfo)... ok

uncaught exception: ./test(_Z9backtracev+0xd)[0x458f72] ./test(_Z15abort_backtracev+0x5)[0x458f86] /usr/lib/arm-linux-gnueabihf/libstdc++.so.6(+0x7c174)[0xb6e64174]

All tests passed