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File tls-no-direct.diff of Package Gcc9
For i?86 negative offsets to %fs segment accesses cause a hypervisor trap for Xen. Avoid this by making accesses indirect. ??? Note that similar to the behavior on SLE11 this only affects the compiler built on %ix86, not that on x86_64, even with -m32. Index: gcc/config/i386/linux.h =================================================================== --- gcc/config/i386/linux.h.orig 2015-12-17 15:07:37.785650062 +0100 +++ gcc/config/i386/linux.h 2015-12-17 15:08:06.393983290 +0100 @@ -24,3 +24,9 @@ along with GCC; see the file COPYING3. #undef MUSL_DYNAMIC_LINKER #define MUSL_DYNAMIC_LINKER "/lib/ld-musl-i386.so.1" + +/* This slows down Xen, so take a very small general performance hit + for not accessing the %fs segment with negative offsets by making + GCC not emit direct accesses to %fs at all. */ +#undef TARGET_TLS_DIRECT_SEG_REFS_DEFAULT +#define TARGET_TLS_DIRECT_SEG_REFS_DEFAULT 0
