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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.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Alistair Francis <alistair.francis@xilinx.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 1505137930-13255-3-git-send-email-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2017-09-14 18:43:16 +01:00
parent 4a16724f06
commit dc3c4c14f0
4 changed files with 19 additions and 1 deletions
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6
target/arm/cpu.c
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@ -235,6 +235,12 @@ 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