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target/arm: Restore M-profile CONTROL.SPSEL before any tailchaining 

On exception return for M-profile, we must restore the CONTROL.SPSEL
bit from the EXCRET value before we do any kind of tailchaining,
including for the derived exceptions on integrity check failures.
Otherwise we will give the guest an incorrect EXCRET.SPSEL value on
exception entry for the tailchained exception.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20180720145647.8810-4-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2018-08-14 17:17:22 +01:00
parent b8109608bc
commit 89b1fec193
1 changed files with 10 additions and 6 deletions
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16
target/arm/helper.c
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@ -7131,6 +7131,16 @@ static void do_v7m_exception_exit(ARMCPU *cpu)
}
}
/*
* Set CONTROL.SPSEL from excret.SPSEL. Since we're still in
* Handler mode (and will be until we write the new XPSR.Interrupt
* field) this does not switch around the current stack pointer.
* We must do this before we do any kind of tailchaining, including
* for the derived exceptions on integrity check failures, or we will
* give the guest an incorrect EXCRET.SPSEL value on exception entry.
*/
write_v7m_control_spsel_for_secstate(env, return_to_sp_process, exc_secure);
if (sfault) {
env->v7m.sfsr |= R_V7M_SFSR_INVER_MASK;
armv7m_nvic_set_pending(env->nvic, ARMV7M_EXCP_SECURE, false);
@ -7152,12 +7162,6 @@ static void do_v7m_exception_exit(ARMCPU *cpu)
return;
}
/* Set CONTROL.SPSEL from excret.SPSEL. Since we're still in
* Handler mode (and will be until we write the new XPSR.Interrupt
* field) this does not switch around the current stack pointer.
*/
write_v7m_control_spsel_for_secstate(env, return_to_sp_process, exc_secure);
switch_v7m_security_state(env, return_to_secure);
{