Peter Maydell af5199347a target-arm: Fix incorrect setting of E bit in CPSR
Commit 4cc35614a moved the exception mask bits out of env->uncached_cpsr
and into env->daif. However the env->daif contents are AArch64 style
mask bits, which include not just the AArch32 AIF bits but also the
new D bit (masks debug exceptions). This means that when reconstructing
the AArch32 CPSR value we must not allow the D bit in env->daif to get
into the CPSR, because the corresponding bit in the CPSR is E, the
endianness bit.

This bug didn't affect execution under TCG because we don't implement
endianness-swapping and so simply ignored the E bit; however it meant
that kernel booting under KVM failed, because KVM does honour the E bit.

Reported-by: Alexey Ignatov <lexszero@gmail.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
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Original Xbox Emulator for Windows, macOS, and Linux (Active Development)
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