Re: [PATCH v4 02/31] target/ppc: Split out decode_legacy

[David Gibson <david@gibson.dropbear.id.au>]

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On Wed, May 12, 2021 at 03:54:12PM -0300, matheus.ferst@eldorado.org.br wrote:
> From: Richard Henderson <richard.henderson@linaro.org>
> 
> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
> Reviewed-by: Luis Pires <luis.pires@eldorado.org.br>
> Signed-off-by: Matheus Ferst <matheus.ferst@eldorado.org.br>

Applied to ppc-for-6.1.

> ---
>  target/ppc/translate.c | 115 +++++++++++++++++++++++------------------
>  1 file changed, 64 insertions(+), 51 deletions(-)
> 
> diff --git a/target/ppc/translate.c b/target/ppc/translate.c
> index 9abe03222d..3ad4c7163d 100644
> --- a/target/ppc/translate.c
> +++ b/target/ppc/translate.c
> @@ -9253,6 +9253,62 @@ void ppc_cpu_dump_statistics(CPUState *cs, int flags)
>  #endif
>  }
>  
> +static bool decode_legacy(PowerPCCPU *cpu, DisasContext *ctx, uint32_t insn)
> +{
> +    opc_handler_t **table, *handler;
> +    uint32_t inval;
> +
> +    ctx->opcode = insn;
> +
> +    LOG_DISAS("translate opcode %08x (%02x %02x %02x %02x) (%s)\n",
> +              insn, opc1(insn), opc2(insn), opc3(insn), opc4(insn),
> +              ctx->le_mode ? "little" : "big");
> +
> +    table = cpu->opcodes;
> +    handler = table[opc1(insn)];
> +    if (is_indirect_opcode(handler)) {
> +        table = ind_table(handler);
> +        handler = table[opc2(insn)];
> +        if (is_indirect_opcode(handler)) {
> +            table = ind_table(handler);
> +            handler = table[opc3(insn)];
> +            if (is_indirect_opcode(handler)) {
> +                table = ind_table(handler);
> +                handler = table[opc4(insn)];
> +            }
> +        }
> +    }
> +
> +    /* Is opcode *REALLY* valid ? */
> +    if (unlikely(handler->handler == &gen_invalid)) {
> +        qemu_log_mask(LOG_GUEST_ERROR, "invalid/unsupported opcode: "
> +                      "%02x - %02x - %02x - %02x (%08x) "
> +                      TARGET_FMT_lx "\n",
> +                      opc1(insn), opc2(insn), opc3(insn), opc4(insn),
> +                      insn, ctx->cia);
> +        return false;
> +    }
> +
> +    if (unlikely(handler->type & (PPC_SPE | PPC_SPE_SINGLE | PPC_SPE_DOUBLE)
> +                 && Rc(insn))) {
> +        inval = handler->inval2;
> +    } else {
> +        inval = handler->inval1;
> +    }
> +
> +    if (unlikely((insn & inval) != 0)) {
> +        qemu_log_mask(LOG_GUEST_ERROR, "invalid bits: %08x for opcode: "
> +                      "%02x - %02x - %02x - %02x (%08x) "
> +                      TARGET_FMT_lx "\n", insn & inval,
> +                      opc1(insn), opc2(insn), opc3(insn), opc4(insn),
> +                      insn, ctx->cia);
> +        return false;
> +    }
> +
> +    handler->handler(ctx);
> +    return true;
> +}
> +
>  static void ppc_tr_init_disas_context(DisasContextBase *dcbase, CPUState *cs)
>  {
>      DisasContext *ctx = container_of(dcbase, DisasContext, base);
> @@ -9334,66 +9390,23 @@ static void ppc_tr_translate_insn(DisasContextBase *dcbase, CPUState *cs)
>      DisasContext *ctx = container_of(dcbase, DisasContext, base);
>      PowerPCCPU *cpu = POWERPC_CPU(cs);
>      CPUPPCState *env = cs->env_ptr;
> -    opc_handler_t **table, *handler;
> +    uint32_t insn;
> +    bool ok;
>  
>      LOG_DISAS("----------------\n");
>      LOG_DISAS("nip=" TARGET_FMT_lx " super=%d ir=%d\n",
>                ctx->base.pc_next, ctx->mem_idx, (int)msr_ir);
>  
>      ctx->cia = ctx->base.pc_next;
> -    ctx->opcode = translator_ldl_swap(env, ctx->base.pc_next,
> -                                      need_byteswap(ctx));
> -
> -    LOG_DISAS("translate opcode %08x (%02x %02x %02x %02x) (%s)\n",
> -              ctx->opcode, opc1(ctx->opcode), opc2(ctx->opcode),
> -              opc3(ctx->opcode), opc4(ctx->opcode),
> -              ctx->le_mode ? "little" : "big");
> +    insn = translator_ldl_swap(env, ctx->base.pc_next, need_byteswap(ctx));
>      ctx->base.pc_next += 4;
> -    table = cpu->opcodes;
> -    handler = table[opc1(ctx->opcode)];
> -    if (is_indirect_opcode(handler)) {
> -        table = ind_table(handler);
> -        handler = table[opc2(ctx->opcode)];
> -        if (is_indirect_opcode(handler)) {
> -            table = ind_table(handler);
> -            handler = table[opc3(ctx->opcode)];
> -            if (is_indirect_opcode(handler)) {
> -                table = ind_table(handler);
> -                handler = table[opc4(ctx->opcode)];
> -            }
> -        }
> -    }
> -    /* Is opcode *REALLY* valid ? */
> -    if (unlikely(handler->handler == &gen_invalid)) {
> -        qemu_log_mask(LOG_GUEST_ERROR, "invalid/unsupported opcode: "
> -                      "%02x - %02x - %02x - %02x (%08x) "
> -                      TARGET_FMT_lx " %d\n",
> -                      opc1(ctx->opcode), opc2(ctx->opcode),
> -                      opc3(ctx->opcode), opc4(ctx->opcode),
> -                      ctx->opcode, ctx->cia, (int)msr_ir);
> -    } else {
> -        uint32_t inval;
>  
> -        if (unlikely(handler->type & (PPC_SPE | PPC_SPE_SINGLE | PPC_SPE_DOUBLE)
> -                     && Rc(ctx->opcode))) {
> -            inval = handler->inval2;
> -        } else {
> -            inval = handler->inval1;
> -        }
> -
> -        if (unlikely((ctx->opcode & inval) != 0)) {
> -            qemu_log_mask(LOG_GUEST_ERROR, "invalid bits: %08x for opcode: "
> -                          "%02x - %02x - %02x - %02x (%08x) "
> -                          TARGET_FMT_lx "\n", ctx->opcode & inval,
> -                          opc1(ctx->opcode), opc2(ctx->opcode),
> -                          opc3(ctx->opcode), opc4(ctx->opcode),
> -                          ctx->opcode, ctx->cia);
> -            gen_inval_exception(ctx, POWERPC_EXCP_INVAL_INVAL);
> -            ctx->base.is_jmp = DISAS_NORETURN;
> -            return;
> -        }
> +    ok = decode_legacy(cpu, ctx, insn);
> +    if (!ok) {
> +        gen_invalid(ctx);
> +        ctx->base.is_jmp = DISAS_NORETURN;
>      }
> -    (*(handler->handler))(ctx);
> +
>  #if defined(DO_PPC_STATISTICS)
>      handler->count++;
>  #endif

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson

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