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35af6c33d8
Turns out it's not always possible to figure out whether an asm() statement argument points to a valid memory region. One example would be per-CPU objects in the Linux kernel, for which the addresses are calculated using the FS register and a small offset in the .data..percpu section. To avoid pulling all sorts of checks into the instrumentation, we replace actual checking/unpoisoning code with calls to msan_instrument_asm_load(ptr, size) and msan_instrument_asm_store(ptr, size) functions in the runtime. This patch doesn't implement the runtime hooks in compiler-rt, as there's been no demand in assembly instrumentation for userspace apps so far. llvm-svn: 345702