On 9/16/18 5:04 PM, Fredrik Noring wrote:
> The Linux kernel traps and emulates certain instructions. For user only,
> QEMU is the kernel, so we emulate those traps by simply emulating the
> instructions directly.
>
> Signed-off-by: Fredrik Noring <nor...@nocrew.org>
Reviewed-by: Philippe Mathieu-Daudé <f4...@amsat.org>
> ---
> target/mips/translate.c | 14 ++++++++++++++
> 1 file changed, 14 insertions(+)
>
> diff --git a/target/mips/translate.c b/target/mips/translate.c
> index c35be0053b..77d678353e 100644
> --- a/target/mips/translate.c
> +++ b/target/mips/translate.c
> @@ -1887,6 +1887,20 @@ static inline void check_insn_opc_removed(DisasContext
> *ctx, int flags)
> }
> }
>
> +/*
> + * Unless user only, when the kernel emulates the code, a "reserved
> + * instruction" exception is generated if the CPU has corresponding
> + * flag set which indicates that the instruction has been removed.
> + */
> +static inline void check_insn_opc_user_only(DisasContext *ctx, int flags)
> +{
> +#ifndef CONFIG_USER_ONLY
> + if (unlikely(ctx->insn_flags & flags)) {
> + generate_exception_end(ctx, EXCP_RI);
> + }
> +#endif
> +}
> +
> /* This code generates a "reserved instruction" exception if the
> CPU does not support 64-bit paired-single (PS) floating point data type */
> static inline void check_ps(DisasContext *ctx)
>
