diff options
| author | Peter Maydell <peter.maydell@linaro.org> | 2014-03-10 14:56:28 +0000 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2014-03-10 14:56:28 +0000 |
| commit | af5199347a874db2214bf818151bad71b856ff37 (patch) | |
| tree | 4bea347b54aa797e26bf10d31d0462b4d7d86dd4 | |
| parent | e9d818b8b1a7fadc6c92256b716f1bc21b8daabc (diff) | |
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>
| -rw-r--r-- | target-arm/helper.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/target-arm/helper.c b/target-arm/helper.c index 90f85f1899..d44e60349d 100644 --- a/target-arm/helper.c +++ b/target-arm/helper.c @@ -2478,7 +2478,7 @@ uint32_t cpsr_read(CPUARMState *env) (env->CF << 29) | ((env->VF & 0x80000000) >> 3) | (env->QF << 27) | (env->thumb << 5) | ((env->condexec_bits & 3) << 25) | ((env->condexec_bits & 0xfc) << 8) - | (env->GE << 16) | env->daif; + | (env->GE << 16) | (env->daif & CPSR_AIF); } void cpsr_write(CPUARMState *env, uint32_t val, uint32_t mask) |