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3a56cfedbc
fasttrap instruments certain instructions by overwriting them and copying the original instruction to some per-thread scratch space which is executed after the probe fires. This trampoline jumps back to the tracepoint after executing the original instruction. The created mapping has both write and execute permissions, and so this mechanism doesn't work when allow_wx is disabled. Work around the restriction by using proc_rwmem() to write to the trampoline. Reviewed by: vangyzen Tested by: Amit <akamit91@hotmail.com> MFC after: 2 weeks Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D34304 |
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