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target-arm: v7M: ignore writes to CONTROL.SPSEL from Thread mode

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For v7M, writes to the CONTROL register are only permitted for
privileged code. However even if the code is privileged, the
write must not affect the SPSEL bit in the CONTROL register
if the CPU is in Thread mode (as documented in the pseudocode
for the MSR instruction). Implement this, instead of permitting
SPSEL to be written in all cases.

This was causing mbed applications not to run, because the
RTX RTOS they use relies on this behaviour.

Backports commit 792dac309c8660306557ba058b8b5a6a75ab3c1f from qemu
This commit is contained in:
Peter Maydell 2018-03-04 13:04:18 -05:00 committed by Lioncash
parent 4ae080e27f
commit a897ee919b
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 10 additions and 3 deletions
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13
qemu/target/arm/helper.c
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@ -8069,9 +8069,16 @@ void HELPER(v7m_msr)(CPUARMState *env, uint32_t maskreg, uint32_t val)
env->v7m.faultmask = val & 1;
break;
case 20: /* CONTROL */
switch_v7m_sp(env, (val & R_V7M_CONTROL_SPSEL_MASK) != 0);
env->v7m.control = val & (R_V7M_CONTROL_SPSEL_MASK |
R_V7M_CONTROL_NPRIV_MASK);
/* Writing to the SPSEL bit only has an effect if we are in
* thread mode; other bits can be updated by any privileged code.
* switch_v7m_sp() deals with updating the SPSEL bit in
* env->v7m.control, so we only need update the others.
*/
if (env->v7m.exception == 0) {
switch_v7m_sp(env, (val & R_V7M_CONTROL_SPSEL_MASK) != 0);
}
env->v7m.control &= ~R_V7M_CONTROL_NPRIV_MASK;
env->v7m.control |= val & R_V7M_CONTROL_NPRIV_MASK;
break;
default:
qemu_log_mask(LOG_GUEST_ERROR, "Attempt to write unknown special"