diff options
| author | Peter Maydell <peter.maydell@linaro.org> | 2013-09-10 19:09:32 +0100 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2013-09-10 19:09:32 +0100 |
| commit | 78dbbbe4dff95369c63bf77ee0df23371e1d6602 (patch) | |
| tree | e313eb5118e9f02d616b0a6a286c0722d48a23da /target-arm/helper.c | |
| parent | 534df156090539854c2ac819dcdb096d01dab5c1 (diff) | |
target-arm: Avoid "1 << 31" undefined behaviour
Avoid the undefined behaviour of "1 << 31" by using 1U to make
the shift be of an unsigned value rather than shifting into the
sign bit of a signed integer. For consistency, we make all the
CPSR_* constants unsigned, though the only one which triggers
undefined behaviour is CPSR_N.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Message-id: 1378391908-22137-3-git-send-email-peter.maydell@linaro.org
Diffstat (limited to 'target-arm/helper.c')
| -rw-r--r-- | target-arm/helper.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/target-arm/helper.c b/target-arm/helper.c index e51ef20aea..c1a68c7506 100644 --- a/target-arm/helper.c +++ b/target-arm/helper.c @@ -972,7 +972,7 @@ static int par_write(CPUARMState *env, const ARMCPRegInfo *ri, uint64_t value) static inline bool extended_addresses_enabled(CPUARMState *env) { return arm_feature(env, ARM_FEATURE_LPAE) - && (env->cp15.c2_control & (1 << 31)); + && (env->cp15.c2_control & (1U << 31)); } static int ats_write(CPUARMState *env, const ARMCPRegInfo *ri, uint64_t value) @@ -1385,7 +1385,7 @@ static int mpidr_read(CPUARMState *env, const ARMCPRegInfo *ri, * so these bits always RAZ. */ if (arm_feature(env, ARM_FEATURE_V7MP)) { - mpidr |= (1 << 31); + mpidr |= (1U << 31); /* Cores which are uniprocessor (non-coherent) * but still implement the MP extensions set * bit 30. (For instance, A9UP.) However we do |