Re: [Qemu-devel] [PATCH] mips: set CP0 Debug DExcCode for SDBBP instruction

[Philippe Mathieu-Daudé]

On 05/02/2017 09:03 AM, Pavel Dovgalyuk wrote:
> From: Pavel Dovgalyuk <address@hidden>
>
> This patch fixes setting DExcCode field of CP0 Debug register
> when SDBBP instruction is executed. According to EJTAG specification,
> this field must be set to the value 9 (Bp).
>
> Signed-off-by: Pavel Dovgalyuk <address@hidden>

Reviewed-by: Philippe Mathieu-Daudé <address@hidden>

> ---
>  target/mips/helper.c |    2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/target/mips/helper.c b/target/mips/helper.c
> index e359ca3b44..166f0d1243 100644
> --- a/target/mips/helper.c
> +++ b/target/mips/helper.c
> @@ -627,6 +627,8 @@ void mips_cpu_do_interrupt(CPUState *cs)
>          goto set_DEPC;
>      case EXCP_DBp:
>          env->CP0_Debug |= 1 << CP0DB_DBp;
> +        /* Setup DExcCode - SDBBP instruction */
> +        env->CP0_Debug = (env->CP0_Debug & ~(0x1fULL << CP0DB_DEC)) | 9 << 
> CP0DB_DEC;
>          goto set_DEPC;
>      case EXCP_DDBS:
>          env->CP0_Debug |= 1 << CP0DB_DDBS;