Re: [Qemu-devel] [PATCH v2] m68k: implement movep instruction

[Laurent Vivier]

Le 06/02/2018 à 12:19, Pavel Dovgalyuk a écrit :
> This patch implements movep instruction. It moves data between a data register
> and alternate bytes within the address space starting at the location
> specified and incrementing by two.
> 
> It was designed for the original 68000 and used in firmwares for
> interfacing the 8-bit peripherals through the 16-bit data bus.
> Without this patch opcode for this instruction is recognized as some bitop.
> 
> Signed-off-by: Pavel Dovgalyuk <address@hidden>
> Signed-off-by: Mihail Abakumov <address@hidden>
> 
> --
> 
> v2: - disabled movep for Coldfire
>     - fixed gen_store/load usage
> ---
>  target/m68k/cpu.c       |    3 +++
>  target/m68k/cpu.h       |    1 +
>  target/m68k/translate.c |   53 
> +++++++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 57 insertions(+)
> 
> diff --git a/target/m68k/cpu.c b/target/m68k/cpu.c
> index 98919b3..2b38b9b 100644
> --- a/target/m68k/cpu.c
> +++ b/target/m68k/cpu.c
> @@ -113,6 +113,7 @@ static void m68000_cpu_initfn(Object *obj)
>      m68k_set_feature(env, M68K_FEATURE_M68000);
>      m68k_set_feature(env, M68K_FEATURE_USP);
>      m68k_set_feature(env, M68K_FEATURE_WORD_INDEX);
> +    m68k_set_feature(env, M68K_FEATURE_MOVEP);
>  }
>  
>  static void m68020_cpu_initfn(Object *obj)
> @@ -135,6 +136,7 @@ static void m68020_cpu_initfn(Object *obj)
>      m68k_set_feature(env, M68K_FEATURE_BKPT);
>      m68k_set_feature(env, M68K_FEATURE_RTD);
>      m68k_set_feature(env, M68K_FEATURE_CHK2);
> +    m68k_set_feature(env, M68K_FEATURE_MOVEP);
>  }
>  #define m68030_cpu_initfn m68020_cpu_initfn
>  
> @@ -145,6 +147,7 @@ static void m68040_cpu_initfn(Object *obj)
>  
>      m68020_cpu_initfn(obj);
>      m68k_set_feature(env, M68K_FEATURE_M68040);
> +    m68k_set_feature(env, M68K_FEATURE_MOVEP);

You don't need to add it here as it comes with m68020_cpu_initfn().

Thanks,
Laurent