On 24.10.18. 14:18, Aleksandar Markovic wrote:
> From: Aleksandar Markovic <[email protected]>
>
> Provide the placeholder and add the invocation logic for MXU
> decoding engine.
>
> Signed-off-by: Aleksandar Markovic <[email protected]>
> ---
> target/mips/translate.c | 8 ++++++++
> 1 file changed, 8 insertions(+)
>
> diff --git a/target/mips/translate.c b/target/mips/translate.c
> index fefe9ac..128cabe 100644
> --- a/target/mips/translate.c
> +++ b/target/mips/translate.c
> @@ -23844,6 +23844,12 @@ static void decode_opc_special(CPUMIPSState *env,
> DisasContext *ctx)
> }
> }
>
> +static void decode_opc_mxu(CPUMIPSState *env, DisasContext *ctx)
> +{
> + MIPS_INVAL("decode_opc_mxu");
> + generate_exception_end(ctx, EXCP_RI);
> +}
> +
> static void decode_opc_special2_legacy(CPUMIPSState *env, DisasContext *ctx)
> {
> int rs, rt, rd;
> @@ -26087,6 +26093,8 @@ static void decode_opc(CPUMIPSState *env,
> DisasContext *ctx)
> case OPC_SPECIAL2:
> if ((ctx->insn_flags & INSN_R5900) && (ctx->insn_flags & ASE_MMI)) {
> decode_tx79_mmi(env, ctx);
> + } else if (ctx->insn_flags & ASE_MXU) {
> + decode_opc_mxu(env, ctx);
Is the best way to implement this to include processing of MUL, CLZ,
CLO, SDDP instructions into decode_opc_mxu as their encodings aren't
overlaid by MXU instructions
considering MIPS SPECIAL2 instruction pool and MXU Instruction Set?
> } else {
> decode_opc_special2_legacy(env, ctx);
> }
