Guo Ren 0ea2dc7cd6 csky: stacktrace supported. ...

The gcc option "-mbacktrace" will push fp(r8),lr into stack and we could
unwind the stack with:
	fp = *fp
	lr = (unsigned int *)fp[1]

Signed-off-by: Guo Ren <ren_guo@c-sky.com>

2018-12-31 23:12:22 +08:00

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