On Wed, Mar 25, 2020 at 12:45:11PM +0100, Ard Biesheuvel wrote: > I don't think this is the right fix. What is wrong with keeping these > .cpu and .arch directives in the .S files, and simply make > SYM_FUNC_START() expand to something that includes .arch_extension pac > or .arch_extension bti when needed? That way, we only use > .arch_extension when we know the assembler supports it (given that > .arch_extension support itself should predate BTI or PAC support in > GAS or Clang) Since BTI is a mandatory feature of v8.5 there is no BTI arch_extension, you can only enable it by moving the base architecture to v8.5. You'd need to use .arch and that feels likely to find us sharp edges to run into.
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