Add TLS support to SVA. TLS segmentation is managed in SVA.#35
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tupipa wants to merge 1 commit intojtcriswell:masterfrom
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Add TLS support to SVA. TLS segmentation is managed in SVA.#35tupipa wants to merge 1 commit intojtcriswell:masterfrom
tupipa wants to merge 1 commit intojtcriswell:masterfrom
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1. added two members 'fsbase', and 'state_flags' in structure sva_integer_state_t 2. updated system call entry: SVAsyscall in handler.S: reset state_flags to 0 before enter syscall; after syscall returns, check state_flags to determine wheter to restore FSBASE MSR 3. updated context switch (sva_swap_integer): set state_flags to 1 for old thread. 4. added a hack function sva_init_fsbase. This is used for Kernel to update 'fsbase' in SVA. This is a hack since 'fsbase' should not be exposed to Kernel. A better solution could be allowing the application to issue a hypercall directly to SVA to initializae 'fsbase'.
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Tested on Intel Sandy Bridge (Core i5-2410M). -- Note: This arch has no 'rdrand' instruction which is used to generate SVA thread ID. Thus this is replaced by an integer number during testing. |
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Enable FS/FSBASE and related SVA structure save/restore during system call dispatching (SVAsyscall in handler.S) and context switching (sva_swap_integer). Kernel is also patched (as a hack) for initialization (or reset) of FSBASE.
A clearer patch for kernel can be viewed online: tupipa/sva_freebsd90@a1edb59
Known Issues: