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target/arm: Add v8M stack checks for MSR to SP_NS

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Updating the NS stack pointer via MSR to SP_NS should include
a check whether the new SP value is below the stack limit.
No other kinds of update to the various stack pointer and
limit registers via MSR should perform a check.

Backports commit 167765f0739e4a108e8c2e2ff2f37917df5658f9 from qemu
This commit is contained in:
Peter Maydell 2018-10-08 14:24:29 -04:00 committed by Lioncash
parent 76f521e6c3
commit ff812cc152
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 13 additions and 1 deletions
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14
qemu/target/arm/helper.c
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@ -10202,11 +10202,23 @@ void HELPER(v7m_msr)(CPUARMState *env, uint32_t maskreg, uint32_t val)
* currently in handler mode or not, using the NS CONTROL.SPSEL.
*/
bool spsel = env->v7m.control[M_REG_NS] & R_V7M_CONTROL_SPSEL_MASK;
bool is_psp = !arm_v7m_is_handler_mode(env) && spsel;
uint32_t limit;
if (!env->v7m.secure) {
return;
}
if (!arm_v7m_is_handler_mode(env) && spsel) {
limit = is_psp ? env->v7m.psplim[false] : env->v7m.msplim[false];
if (val < limit) {
CPUState *cs = CPU(arm_env_get_cpu(env));
cpu_restore_state(cs, GETPC(), true);
raise_exception(env, EXCP_STKOF, 0, 1);
}
if (is_psp) {
env->v7m.other_ss_psp = val;
} else {
env->v7m.other_ss_msp = val;