mmu: fix pointer masking with mstatus.MXR in M-mode #1955
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Pointer masking is disabled if sstatus.MXR is in effect, but M-mode doesn't use paging and hence sstatus.MXR should not be in effect for effective M-mode loads. Do not consider mstatus.MXR when deciding the pointer mask length for effective M-mode loads. vsstatus.MXR wasn't an issue as no effective M-mode load could happen with V=1, but move it below M-mode as well to simplify the conditions. Fixes: 71bdc3b ("pointer masking: Pointer masking does not apply when MXR=1 regardless of MPRV in v1.0.0-rc2") Signed-off-by: Radim Krčmář <rkrcmar@ventanamicro.com>
aswaterman
approved these changes
Apr 10, 2025
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Pointer masking is disabled if sstatus.MXR is in effect, but M-mode doesn't use paging and hence sstatus.MXR should not be in effect for effective M-mode loads.
Do not consider mstatus.MXR when deciding the pointer mask length for effective M-mode loads.
vsstatus.MXR wasn't an issue as no effective M-mode load could happen with V=1, but move it below M-mode as well to simplify the conditions.
Fixes: 71bdc3b ("pointer masking: Pointer masking does not apply when MXR=1 regardless of MPRV in v1.0.0-rc2")