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c18n: New {get,set}context APIs for libunwind #2123

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c18n: New {get,set}context APIs for libunwind #2123

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Commits on Oct 30, 2024

  1. c18n: Compare pointers by converting them to integers first 

    Using relational operators to compare pointers to different trusted
frames is undefined behaviour.
    @dpgao
    dpgao committed Oct 30, 2024
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  2. 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.
    @dpgao
    dpgao committed Oct 30, 2024
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