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Re: [PATCH v2] target/ppc: Fix BookE debug interrupt generation
From: |
Fabiano Rosas |
Subject: |
Re: [PATCH v2] target/ppc: Fix BookE debug interrupt generation |
Date: |
Fri, 22 Apr 2022 09:17:51 -0300 |
Bin Meng <bmeng.cn@gmail.com> writes:
> From: Bin Meng <bin.meng@windriver.com>
>
> Per E500 core reference manual [1], chapter 8.4.4 "Branch Taken Debug
> Event" and chapter 8.4.5 "Instruction Complete Debug Event":
>
> "A branch taken debug event occurs if both MSR[DE] and DBCR0[BRT]
> are set ... Branch taken debug events are not recognized if MSR[DE]
> is cleared when the branch instruction executes."
>
> "An instruction complete debug event occurs when any instruction
> completes execution so long as MSR[DE] and DBCR0[ICMP] are both
> set ... Instruction complete debug events are not recognized if
> MSR[DE] is cleared at the time of the instruction execution."
>
> Current codes do not check MSR.DE bit before setting HFLAGS_SE and
> HFLAGS_BE flag, which would cause the immediate debug interrupt to
> be generated, e.g.: when DBCR0.ICMP bit is set by guest software
> and MSR.DE is not set.
>
> [1] https://www.nxp.com/docs/en/reference-manual/E500CORERM.pdf
>
> Signed-off-by: Bin Meng <bin.meng@windriver.com>
Reviewed-by: Fabiano Rosas <farosas@linux.ibm.com>