Comment 11 for bug 1566054

Did a little more digging, and found that Fredrik Hederstiern proposed a similar patch[1] later that year. It was partially accepted, but the FPU and PSP elements weren't accepted (advice was to submit as separate patches). Further down the thread James asserts the copyright assignment is done for himself, and Fredrik [2].

So with a check that the maintainers have copyright assignments on record, the patches could be safely worked on, and Fredrik's patch is probably best to use, as it was partially accepted.

[1] http://sourceware-org.1504.n7.nabble.com/PATCH-Fix-exception-unwinding-for-ARM-Cortex-M-tt406665.html

[2] http://sourceware-org.1504.n7.nabble.com/PATCH-Fix-exception-unwinding-for-ARM-Cortex-M-td406665.html#a414646