Re: [PATCH 1/3] MIPS: kernel: Support extracting off-line stack traces from user-space with perf

[Peter Zijlstra]

On Tue, Dec 29, 2020 at 08:55:59PM +0800, Tiezhu Yang wrote:
> +u64 perf_reg_abi(struct task_struct *tsk)
> +{
> +	if (test_tsk_thread_flag(tsk, TIF_32BIT_REGS))
> +		return PERF_SAMPLE_REGS_ABI_32;
> +	else
> +		return PERF_SAMPLE_REGS_ABI_64;
> +}

So we recently changed this on x86 to not rely on TIF flags. IIRC the
problem is that on x86 you can change the mode of a task without the
kernel being aware of it. Is something like that possible on MIPS as
well?

The thing x86 does today is look at it's pt_regs state to determine the
actual state.