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arm: Add ARMv6-M programmer's model support

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Forbid stack alignment change. (CCR)
Reserve FAULTMASK, BASEPRI registers.
Report any fault as a HardFault. Disable MemManage, BusFault and
UsageFault, so they always escalated to HardFault. (SHCSR)

Signed-off-by: Julia Suvorova <jusual@mail.ru>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 20180718095628.26442-1-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 17:17:19 +01:00 • committed by Peter Maydell
parent 7c9140afd5
commit 22ab346001
3 changed files with 25 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

13
target/arm/helper.c
View file

@ -10710,13 +10710,13 @@ void HELPER(v7m_msr)(CPUARMState *env, uint32_t maskreg, uint32_t val)
env->v7m.primask[M_REG_NS] = val & 1;
return;
case 0x91: /* BASEPRI_NS */
if (!env->v7m.secure) {
if (!env->v7m.secure || !arm_feature(env, ARM_FEATURE_M_MAIN)) {
return;
}
env->v7m.basepri[M_REG_NS] = val & 0xff;
return;
case 0x93: /* FAULTMASK_NS */
if (!env->v7m.secure) {
if (!env->v7m.secure || !arm_feature(env, ARM_FEATURE_M_MAIN)) {
return;
}
env->v7m.faultmask[M_REG_NS] = val & 1;
@ -10800,9 +10800,15 @@ void HELPER(v7m_msr)(CPUARMState *env, uint32_t maskreg, uint32_t val)
env->v7m.primask[env->v7m.secure] = val & 1;
break;
case 17: /* BASEPRI */
if (!arm_feature(env, ARM_FEATURE_M_MAIN)) {
goto bad_reg;
}
env->v7m.basepri[env->v7m.secure] = val & 0xff;
break;
case 18: /* BASEPRI_MAX */
if (!arm_feature(env, ARM_FEATURE_M_MAIN)) {
goto bad_reg;
}
val &= 0xff;
if (val != 0 && (val < env->v7m.basepri[env->v7m.secure]
|| env->v7m.basepri[env->v7m.secure] == 0)) {
@ -10810,6 +10816,9 @@ void HELPER(v7m_msr)(CPUARMState *env, uint32_t maskreg, uint32_t val)
}
break;
case 19: /* FAULTMASK */
if (!arm_feature(env, ARM_FEATURE_M_MAIN)) {
goto bad_reg;
}
env->v7m.faultmask[env->v7m.secure] = val & 1;
break;
case 20: /* CONTROL */