armv7m: honour CCR.STACKALIGN on exception entry
The CCR.STACKALIGN bit controls whether the CPU is supposed to force 8-alignment of the stack pointer on entry to the exception handler. Signed-off-by: Michael Davidsaver <mdavidsaver@gmail.com> Message-id: 1485285380-10565-6-git-send-email-peter.maydell@linaro.org [PMM: commit message and comment tweaks] Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
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@ -6110,10 +6110,8 @@ void arm_v7m_cpu_do_interrupt(CPUState *cs)
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return; /* Never happens. Keep compiler happy. */
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}
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/* Align stack pointer. */
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/* ??? Should only do this if Configuration Control Register
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STACKALIGN bit is set. */
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if (env->regs[13] & 4) {
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/* Align stack pointer if the guest wants that */
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if ((env->regs[13] & 4) && (env->v7m.ccr & R_V7M_CCR_STKALIGN_MASK)) {
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env->regs[13] -= 4;
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xpsr |= 0x200;
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}
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