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Reads are done with execute access. It is not clear whether writes are legal at all -- for now, leave helper_st_asi unchanged, so that we continue to raise an mmu fault. This generalizes the exiting code for ASI_KERNELTXT to be usable for ASI_USERTXT as well, by passing down the MemOpIdx to use. Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2281 Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2059 Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1609 Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1166 Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Acked-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk> Tested-by: M Bazz <bazz@bazz1.com>