Re: [Qemu-devel] [PATCH v12 14/27] target/arm: [tcg] Port to init_disas_context

["Alex Bennée" <alex.bennee@linaro.org>]

Lluís Vilanova <vilanova@ac.upc.edu> writes:

> Incrementally paves the way towards using the generic instruction translation
> loop.
>
> Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu>
> Reviewed-by: Richard Henderson <rth@twiddle.net>

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>

> ---
>  target/arm/translate.c |   86 +++++++++++++++++++++++++++---------------------
>  1 file changed, 48 insertions(+), 38 deletions(-)
>
> diff --git a/target/arm/translate.c b/target/arm/translate.c
> index 15b4fcb417..0179b1ce79 100644
> --- a/target/arm/translate.c
> +++ b/target/arm/translate.c
> @@ -11786,32 +11786,12 @@ static bool insn_crosses_page(CPUARMState *env, DisasContext *s)
>      return false;
>  }
>
> -/* generate intermediate code for basic block 'tb'.  */
> -void gen_intermediate_code(CPUState *cs, TranslationBlock *tb)
> +static void arm_tr_init_disas_context(DisasContextBase *dcbase,
> +                                           CPUState *cs)
>  {
> +    DisasContext *dc = container_of(dcbase, DisasContext, base);
>      CPUARMState *env = cs->env_ptr;
>      ARMCPU *cpu = arm_env_get_cpu(env);
> -    DisasContext dc1, *dc = &dc1;
> -    target_ulong next_page_start;
> -    int max_insns;
> -    bool end_of_page;
> -
> -    /* generate intermediate code */
> -
> -    /* The A64 decoder has its own top level loop, because it doesn't need
> -     * the A32/T32 complexity to do with conditional execution/IT blocks/etc.
> -     */
> -    if (ARM_TBFLAG_AARCH64_STATE(tb->flags)) {
> -        gen_intermediate_code_a64(&dc->base, cs, tb);
> -        return;
> -    }
> -
> -    dc->base.tb = tb;
> -    dc->base.pc_first = tb->pc;
> -    dc->base.pc_next = dc->base.pc_first;
> -    dc->base.is_jmp = DISAS_NEXT;
> -    dc->base.num_insns = 0;
> -    dc->base.singlestep_enabled = cs->singlestep_enabled;
>
>      dc->pc = dc->base.pc_first;
>      dc->condjmp = 0;
> @@ -11822,23 +11802,23 @@ void gen_intermediate_code(CPUState *cs, TranslationBlock *tb)
>       */
>      dc->secure_routed_to_el3 = arm_feature(env, ARM_FEATURE_EL3) &&
>                                 !arm_el_is_aa64(env, 3);
> -    dc->thumb = ARM_TBFLAG_THUMB(tb->flags);
> -    dc->sctlr_b = ARM_TBFLAG_SCTLR_B(tb->flags);
> -    dc->be_data = ARM_TBFLAG_BE_DATA(tb->flags) ? MO_BE : MO_LE;
> -    dc->condexec_mask = (ARM_TBFLAG_CONDEXEC(tb->flags) & 0xf) << 1;
> -    dc->condexec_cond = ARM_TBFLAG_CONDEXEC(tb->flags) >> 4;
> -    dc->mmu_idx = core_to_arm_mmu_idx(env, ARM_TBFLAG_MMUIDX(tb->flags));
> +    dc->thumb = ARM_TBFLAG_THUMB(dc->base.tb->flags);
> +    dc->sctlr_b = ARM_TBFLAG_SCTLR_B(dc->base.tb->flags);
> +    dc->be_data = ARM_TBFLAG_BE_DATA(dc->base.tb->flags) ? MO_BE : MO_LE;
> +    dc->condexec_mask = (ARM_TBFLAG_CONDEXEC(dc->base.tb->flags) & 0xf) << 1;
> +    dc->condexec_cond = ARM_TBFLAG_CONDEXEC(dc->base.tb->flags) >> 4;
> +    dc->mmu_idx = core_to_arm_mmu_idx(env, ARM_TBFLAG_MMUIDX(dc->base.tb->flags));
>      dc->current_el = arm_mmu_idx_to_el(dc->mmu_idx);
>  #if !defined(CONFIG_USER_ONLY)
>      dc->user = (dc->current_el == 0);
>  #endif
> -    dc->ns = ARM_TBFLAG_NS(tb->flags);
> -    dc->fp_excp_el = ARM_TBFLAG_FPEXC_EL(tb->flags);
> -    dc->vfp_enabled = ARM_TBFLAG_VFPEN(tb->flags);
> -    dc->vec_len = ARM_TBFLAG_VECLEN(tb->flags);
> -    dc->vec_stride = ARM_TBFLAG_VECSTRIDE(tb->flags);
> -    dc->c15_cpar = ARM_TBFLAG_XSCALE_CPAR(tb->flags);
> -    dc->v7m_handler_mode = ARM_TBFLAG_HANDLER(tb->flags);
> +    dc->ns = ARM_TBFLAG_NS(dc->base.tb->flags);
> +    dc->fp_excp_el = ARM_TBFLAG_FPEXC_EL(dc->base.tb->flags);
> +    dc->vfp_enabled = ARM_TBFLAG_VFPEN(dc->base.tb->flags);
> +    dc->vec_len = ARM_TBFLAG_VECLEN(dc->base.tb->flags);
> +    dc->vec_stride = ARM_TBFLAG_VECSTRIDE(dc->base.tb->flags);
> +    dc->c15_cpar = ARM_TBFLAG_XSCALE_CPAR(dc->base.tb->flags);
> +    dc->v7m_handler_mode = ARM_TBFLAG_HANDLER(dc->base.tb->flags);
>      dc->cp_regs = cpu->cp_regs;
>      dc->features = env->features;
>
> @@ -11857,11 +11837,12 @@ void gen_intermediate_code(CPUState *cs, TranslationBlock *tb)
>       *   emit code to generate a software step exception
>       *   end the TB
>       */
> -    dc->ss_active = ARM_TBFLAG_SS_ACTIVE(tb->flags);
> -    dc->pstate_ss = ARM_TBFLAG_PSTATE_SS(tb->flags);
> +    dc->ss_active = ARM_TBFLAG_SS_ACTIVE(dc->base.tb->flags);
> +    dc->pstate_ss = ARM_TBFLAG_PSTATE_SS(dc->base.tb->flags);
>      dc->is_ldex = false;
>      dc->ss_same_el = false; /* Can't be true since EL_d must be AArch64 */
>
> +
>      cpu_F0s = tcg_temp_new_i32();
>      cpu_F1s = tcg_temp_new_i32();
>      cpu_F0d = tcg_temp_new_i64();
> @@ -11870,6 +11851,35 @@ void gen_intermediate_code(CPUState *cs, TranslationBlock *tb)
>      cpu_V1 = cpu_F1d;
>      /* FIXME: cpu_M0 can probably be the same as cpu_V0.  */
>      cpu_M0 = tcg_temp_new_i64();
> +}
> +
> +/* generate intermediate code for basic block 'tb'.  */
> +void gen_intermediate_code(CPUState *cs, TranslationBlock *tb)
> +{
> +    CPUARMState *env = cs->env_ptr;
> +    DisasContext dc1, *dc = &dc1;
> +    target_ulong next_page_start;
> +    int max_insns;
> +    bool end_of_page;
> +
> +    /* generate intermediate code */
> +
> +    /* The A64 decoder has its own top level loop, because it doesn't need
> +     * the A32/T32 complexity to do with conditional execution/IT blocks/etc.
> +     */
> +    if (ARM_TBFLAG_AARCH64_STATE(tb->flags)) {
> +        gen_intermediate_code_a64(&dc->base, cs, tb);
> +        return;
> +    }
> +
> +    dc->base.tb = tb;
> +    dc->base.pc_first = dc->base.tb->pc;
> +    dc->base.pc_next = dc->base.pc_first;
> +    dc->base.is_jmp = DISAS_NEXT;
> +    dc->base.num_insns = 0;
> +    dc->base.singlestep_enabled = cs->singlestep_enabled;
> +    arm_tr_init_disas_context(&dc->base, cs);
> +
>      next_page_start = (dc->base.pc_first & TARGET_PAGE_MASK) + TARGET_PAGE_SIZE;
>      max_insns = tb->cflags & CF_COUNT_MASK;
>      if (max_insns == 0) {


--
Alex Bennée