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target/arm: Tidy scr_write

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Because EL3 has a fixed execution mode, we can properly decide
which of the bits are RES{0,1}.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20181203203839.757-8-richard.henderson@linaro.org
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Richard Henderson 2018-12-13 13:48:05 +00:00 • committed by Peter Maydell
parent 619959c358
commit ea22747c63
2 changed files with 9 additions and 7 deletions
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14
target/arm/helper.c
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@ -1279,11 +1279,15 @@ static void vbar_write(CPUARMState *env, const ARMCPRegInfo *ri,
static void scr_write(CPUARMState *env, const ARMCPRegInfo *ri, uint64_t value)
{
/* We only mask off bits that are RES0 both for AArch64 and AArch32.
* For bits that vary between AArch32/64, code needs to check the
* current execution mode before directly using the feature bit.
*/
uint32_t valid_mask = SCR_AARCH64_MASK | SCR_AARCH32_MASK;
/* Begin with base v8.0 state. */
uint32_t valid_mask = 0x3fff;
if (arm_el_is_aa64(env, 3)) {
value |= SCR_FW | SCR_AW; /* these two bits are RES1. */
valid_mask &= ~SCR_NET;
} else {
valid_mask &= ~(SCR_RW | SCR_ST);
}
if (!arm_feature(env, ARM_FEATURE_EL2)) {
valid_mask &= ~SCR_HCE;