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target/arm: Clear exclusive monitor on v7M reset, exception entry/exit

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For M profile we must clear the exclusive monitor on reset, exception
entry and exception exit. We weren't doing any of these things; fix
this bug.

Backports commit dc3c4c14f0f12854dbd967be3486f4db4e66d25b from qemu
This commit is contained in:
Peter Maydell 2018-03-04 23:08:29 -05:00 committed by Lioncash
parent 09ca9356a3
commit 2a9b62c12b
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 6 additions and 0 deletions
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6
qemu/target/arm/cpu.c
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@ -234,6 +234,12 @@ static void arm_cpu_reset(CPUState *s)
env->regs[15] = 0xFFFF0000;
}
/* M profile requires that reset clears the exclusive monitor;
* A profile does not, but clearing it makes more sense than having it
* set with an exclusive access on address zero.
*/
arm_clear_exclusive(env);
env->vfp.xregs[ARM_VFP_FPEXC] = 0;
#endif