[PATCH 14/15] powerpc/watchpoint/xmon: Don't allow breakpoint overwriting

[Christophe Leroy]

Le 09/03/2020 à 09:58, Ravi Bangoria a écrit :
> Xmon allows overwriting breakpoints because it's supported by only
> one dawr. But with multiple dawrs, overwriting becomes ambiguous
> or unnecessary complicated. So let's not allow it.

Could we drop this completely (I mean the functionnality, not the patch).

Christophe

> 
> Signed-off-by: Ravi Bangoria <ravi.bangoria at linux.ibm.com>
> ---
>   arch/powerpc/xmon/xmon.c | 4 ++++
>   1 file changed, 4 insertions(+)
> 
> diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c
> index 0ca0d29f99c6..ac18fe3e4295 100644
> --- a/arch/powerpc/xmon/xmon.c
> +++ b/arch/powerpc/xmon/xmon.c
> @@ -1381,6 +1381,10 @@ bpt_cmds(void)
>   			printf("Hardware data breakpoint not supported on this cpu\n");
>   			break;
>   		}
> +		if (dabr.enabled) {
> +			printf("Couldn't find free breakpoint register\n");
> +			break;
> +		}
>   		mode = 7;
>   		cmd = inchar();
>   		if (cmd == 'r')
>