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armv7m: honour CCR.STACKALIGN on exception entry

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The CCR.STACKALIGN bit controls whether the CPU is supposed to force
8-alignment of the stack pointer on entry to the exception handler.

Backports commit dc858c6633a9af8b80c1509cf6f825e4390d3ad1 from qemu
This commit is contained in:
Michael Davidsaver 2018-03-02 13:45:02 -05:00 committed by Lioncash
parent 7870bcfcb0
commit 2297b8134b
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 2 additions and 4 deletions
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6
qemu/target/arm/helper.c
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@ -5483,10 +5483,8 @@ void arm_v7m_cpu_do_interrupt(CPUState *cs)
return; /* Never happens. Keep compiler happy. */
}
/* Align stack pointer. */
/* ??? Should only do this if Configuration Control Register
STACKALIGN bit is set. */
if (env->regs[13] & 4) {
/* Align stack pointer if the guest wants that */
if ((env->regs[13] & 4) && (env->v7m.ccr & R_V7M_CCR_STKALIGN_MASK)) {
env->regs[13] -= 4;
xpsr |= 0x200;
}