Re: [PATCH 2/2] LoongArch: Relay BCE exceptions to userland as SIGSEGVs with si_code=SEGV_BNDERR

[WANG Xuerui <kernel@xen0n.name>]

On 4/17/23 01:33, WANG Xuerui wrote:
> <snip>
> @@ -589,6 +591,110 @@ static void bug_handler(struct pt_regs *regs)
>   	}
>   }
>   
> +asmlinkage void noinstr do_bce(struct pt_regs *regs)
> +{
> +	irqentry_state_t state = irqentry_enter(regs);
> +	bool user = user_mode(regs);
> +	unsigned long era = exception_era(regs);
> +	union loongarch_instruction insn;
> +	u64 badv = 0, lower = 0, upper = ULONG_MAX;
> +
> +	if (regs->csr_prmd & CSR_PRMD_PIE)
> +		local_irq_enable();
> +
> +	current->thread.trap_nr = read_csr_excode();
> +
> +	/*
> +	 * notify the kprobe handlers, if instruction is likely to
> +	 * pertain to them.
> +	 */
> +	if (notify_die(DIE_BOUNDS_CHECK, "Bounds check error", regs, 0,
> +		       current->thread.trap_nr, SIGSEGV) == NOTIFY_STOP)
> +		goto out;
> +
> +	__show_regs(regs);

Ah, remnant of debug code. Please ignore this line; I'm not resending 
for now because I fully anticipate a v2 (and possibly even more). Lack 
of coffee/tea and presence of beer during weekends aren't going to help...

-- 
WANG "xen0n" Xuerui

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