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c18n: Expose unified unwinding APIs to setjmp/longjmp and libunwind
Previously, libunwind hard-codes knowledge about the layout of the trusted frame and has read access to the trusted stack. This is fragile and insecure. Now, the task of extracting the relevant registers from the trusted stack is delegated to RTLD, and libunwind no longer has access to the trusted stack. The unified unwinding APIs are declared as dl_c18n_* functions in link.h. setjmp/longjmp have been updated to use them. The previous API has been retained for compatibility with old libunwind.
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