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target/arm: Forbid unprivileged mode for M Baseline 

MSR handling is the only place where CONTROL.nPRIV is modified.

Signed-off-by: Julia Suvorova <jusual@mail.ru>
Message-id: 20180705222622.17139-1-jusual@mail.ru
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Julia Suvorova 2018-08-14 17:17:18 +01:00 committed by Peter Maydell
parent 38441756b7
commit def183446c
1 changed files with 8 additions and 4 deletions
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12
target/arm/helper.c
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@ -10728,8 +10728,10 @@ void HELPER(v7m_msr)(CPUARMState *env, uint32_t maskreg, uint32_t val)
write_v7m_control_spsel_for_secstate(env,
val & R_V7M_CONTROL_SPSEL_MASK,
M_REG_NS);
env->v7m.control[M_REG_NS] &= ~R_V7M_CONTROL_NPRIV_MASK;
env->v7m.control[M_REG_NS] |= val & R_V7M_CONTROL_NPRIV_MASK;
if (arm_feature(env, ARM_FEATURE_M_MAIN)) {
env->v7m.control[M_REG_NS] &= ~R_V7M_CONTROL_NPRIV_MASK;
env->v7m.control[M_REG_NS] |= val & R_V7M_CONTROL_NPRIV_MASK;
}
return;
case 0x98: /* SP_NS */
{
@ -10822,8 +10824,10 @@ void HELPER(v7m_msr)(CPUARMState *env, uint32_t maskreg, uint32_t val)
!arm_v7m_is_handler_mode(env)) {
write_v7m_control_spsel(env, (val & R_V7M_CONTROL_SPSEL_MASK) != 0);
}
env->v7m.control[env->v7m.secure] &= ~R_V7M_CONTROL_NPRIV_MASK;
env->v7m.control[env->v7m.secure] |= val & R_V7M_CONTROL_NPRIV_MASK;
if (arm_feature(env, ARM_FEATURE_M_MAIN)) {
env->v7m.control[env->v7m.secure] &= ~R_V7M_CONTROL_NPRIV_MASK;
env->v7m.control[env->v7m.secure] |= val & R_V7M_CONTROL_NPRIV_MASK;
}
break;
default:
bad_reg: