Re: [Qemu-devel] [PATCH 3/7] target-arm: Rename ARM_FEATURE_DIV to _THUMB_DIV

["Andreas Färber" <andreas.faerber@web.de>]

Am 20.10.2011 15:16, schrieb Peter Maydell:
> Rename the ARM_FEATURE_DIV feature bit to _THUMB_DIV, to
> make room for a new feature switch enabling DIV in the ARM
> encoding. (Cores may implement either (a) no divide insns
> (b) divide insns in Thumb encodings only (c) divide insns
> in both ARM and Thumb encodings.)
> 
> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

Acked-by: Andreas Färber <andreas.faerber@web.de>

Andreas

> ---
>  target-arm/cpu.h       |    2 +-
>  target-arm/helper.c    |    4 ++--
>  target-arm/translate.c |    3 ++-
>  3 files changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/target-arm/cpu.h b/target-arm/cpu.h
> index 6ab780d..00e012e 100644
> --- a/target-arm/cpu.h
> +++ b/target-arm/cpu.h
> @@ -366,7 +366,7 @@ enum arm_features {
>      ARM_FEATURE_VFP3,
>      ARM_FEATURE_VFP_FP16,
>      ARM_FEATURE_NEON,
> -    ARM_FEATURE_DIV,
> +    ARM_FEATURE_THUMB_DIV, /* divide supported in Thumb encoding */
>      ARM_FEATURE_M, /* Microcontroller profile.  */
>      ARM_FEATURE_OMAPCP, /* OMAP specific CP15 ops handling.  */
>      ARM_FEATURE_THUMB2EE,
> diff --git a/target-arm/helper.c b/target-arm/helper.c
> index 17ef98b..faf0283 100644
> --- a/target-arm/helper.c
> +++ b/target-arm/helper.c
> @@ -193,7 +193,7 @@ static void cpu_reset_model_id(CPUARMState *env, uint32_t id)
>          set_feature(env, ARM_FEATURE_THUMB2);
>          set_feature(env, ARM_FEATURE_V7);
>          set_feature(env, ARM_FEATURE_M);
> -        set_feature(env, ARM_FEATURE_DIV);
> +        set_feature(env, ARM_FEATURE_THUMB_DIV);
>          break;
>      case ARM_CPUID_ANY: /* For userspace emulation.  */
>          set_feature(env, ARM_FEATURE_V4T);
> @@ -207,7 +207,7 @@ static void cpu_reset_model_id(CPUARMState *env, uint32_t id)
>          set_feature(env, ARM_FEATURE_VFP_FP16);
>          set_feature(env, ARM_FEATURE_NEON);
>          set_feature(env, ARM_FEATURE_THUMB2EE);
> -        set_feature(env, ARM_FEATURE_DIV);
> +        set_feature(env, ARM_FEATURE_THUMB_DIV);
>          set_feature(env, ARM_FEATURE_V7MP);
>          break;
>      case ARM_CPUID_TI915T:
> diff --git a/target-arm/translate.c b/target-arm/translate.c
> index e99fc18..deb0bcf 100644
> --- a/target-arm/translate.c
> +++ b/target-arm/translate.c
> @@ -8513,8 +8513,9 @@ static int disas_thumb2_insn(CPUState *env, DisasContext *s, uint16_t insn_hw1)
>              tmp2 = load_reg(s, rm);
>              if ((op & 0x50) == 0x10) {
>                  /* sdiv, udiv */
> -                if (!arm_feature(env, ARM_FEATURE_DIV))
> +                if (!arm_feature(env, ARM_FEATURE_THUMB_DIV)) {
>                      goto illegal_op;
> +                }
>                  if (op & 0x20)
>                      gen_helper_udiv(tmp, tmp, tmp2);
>                  else