https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=221337
--- Comment #7 from Dimitry Andric <d...@freebsd.org> --- (In reply to Konstantin Belousov from comment #6) > (In reply to Dimitry Andric from comment #5) > Still the question is up. Why this code wants 8-byte alignment of the TLS > segment for module with index 1 ? > > What would not work otherwise ? Ah sorry, that is the way upstream compiler-rt has apparently hardcoded it, e.g. they use a define SHADOW_GRANULARITY for this, here: https://github.com/llvm-mirror/compiler-rt/blob/master/lib/asan/asan_mapping.h#L193 127 static const u64 kDefaultShadowScale = 3; ... 145 #define SHADOW_SCALE kDefaultShadowScale ... 193 #define SHADOW_GRANULARITY (1ULL << SHADOW_SCALE) The same granularity scale values is found in the llvm instrumentation libraries, here: https://github.com/llvm-mirror/llvm/blob/master/lib/Transforms/Instrumentation/AddressSanitizer.cpp#L70 70 static const uint64_t kDefaultShadowScale = 3; In the past I have attempted to lower this scale to 2, but ran into hundreds of test failures, so I abandoned that effort. I think the assumption is working without issue for e.g. Linux, since they left the SysV ABI a long time ago there. And apparently we have been lucky somehow, all this time; it has worked well since the first time we tried AddressSanitizer, up to 12.0 before jemalloc 5.0.0. -- You are receiving this mail because: You are the assignee for the bug. _______________________________________________ freebsd-bugs@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-bugs To unsubscribe, send any mail to "freebsd-bugs-unsubscr...@freebsd.org"
