From: Daniel Henrique Barboza <[email protected]> By the priv spec the value "3" is marked as 'Reserved' for mstatus.UXL. Handle a mstatus.UXL = 3 write by writing the current 'xl' instead.
Fixes: https://gitlab.com/qemu-project/qemu/-/work_items/3367 Signed-off-by: Daniel Henrique Barboza <[email protected]> Acked-by: Alistair Francis <[email protected]> Message-ID: <[email protected]> Signed-off-by: Alistair Francis <[email protected]> --- target/riscv/csr.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/target/riscv/csr.c b/target/riscv/csr.c index 83ca354bf0..d004a4bfb4 100644 --- a/target/riscv/csr.c +++ b/target/riscv/csr.c @@ -2045,7 +2045,17 @@ static RISCVException write_mstatus(CPURISCVState *env, int csrno, if (xl != MXL_RV32 || env->debugger) { if ((val & MSTATUS64_UXL) != 0) { + uint64_t uxl = val & MSTATUS64_UXL >> 32; mask |= MSTATUS64_UXL; + + /* + * uxl = 3 is reserved so write the current xl instead. + * In case xl = MXL_RV128 (3) write MXL_RV64. + */ + if (uxl == 3) { + uxl = xl == MXL_RV128 ? MXL_RV64 : xl; + val = deposit64(val, 32, 2, uxl); + } } } -- 2.54.0
