setjmp/longjump
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The latest version of this topic can be found at setjmp-longjump.
When you include setjmpex.h or setjmp.h, all calls to setjmp or longjmp will result in an unwind that invokes destructors and finally calls. This differs from x86, where including setjmp.h results in finally clauses and destructors not being invoked.
A call to setjmp preserves the current stack pointer, non-volatile registers, and MxCsr registers. Calls to longjmp return to the most recent setjmp call site and resets the stack pointer, non-volatile registers, and MxCsr registers, back to the state as preserved by the most recent setjmp call.