Re: [PATCH 1/2] target/m68k: Clear mach in m68k_cpu_disas_set_info

[Laurent Vivier]

Le 30/04/2022 à 19:02, Richard Henderson a écrit :
> Zero selects all cpu features in disas/m68k.c,
> which is really what we want -- not limited to 68040.

But what happens when an instruction has to be decoded differently between 
680x0 and coldfire?

for instance in disas/m68k.c, we have:

{"addil", 6,    one(0003200),   one(0177700), "#l$s", m68000up },
{"addil", 6,    one(0003200),   one(0177700), "#lDs", mcfisa_a },

{"addl", 6, one(0003200),   one(0177700), "#l$s", m68000up },
{"addl", 6, one(0003200),   one(0177700), "#lDs", mcfisa_a },

{"andil", 6,    one(0001200),   one(0177700), "#l$s", m68000up },
{"andil", 6,    one(0001200),   one(0177700), "#lDs", mcfisa_a },

{"andl", 6, one(0001200),   one(0177700), "#l$s", m68000up },
{"andl", 6, one(0001200),   one(0177700), "#lDs", mcfisa_a },

{"bchg", 4, one(0004100),   one(0177700), "#b$s", m68000up },
{"bchg", 4, one(0004100),   one(0177700), "#bqs", mcfisa_a },

{"bclr", 4, one(0004200),   one(0177700), "#b$s", m68000up },
{"bclr", 4, one(0004200),   one(0177700), "#bqs", mcfisa_a },

{"bset", 2, one(0000700),   one(0170700), "Dd$s", m68000up | mcfisa_a },
{"bset", 2, one(0000700),   one(0170700), "Ddvs", mcfisa_a },
{"bset", 4, one(0004300),   one(0177700), "#b$s", m68000up },
{"bset", 4, one(0004300),   one(0177700), "#bqs", mcfisa_a },

{"btst", 4, one(0004000),   one(0177700), "#b@s", m68000up },
{"btst", 4, one(0004000),   one(0177700), "#bqs", mcfisa_a },

{"cmpib", 4,    one(0006000),   one(0177700), "#b@s", m68000up },
{"cmpib", 4,    one(0006000),   one(0177700), "#bDs", mcfisa_b },
{"cmpiw", 4,    one(0006100),   one(0177700), "#w@s", m68000up },
{"cmpiw", 4,    one(0006100),   one(0177700), "#wDs", mcfisa_b },
{"cmpil", 6,    one(0006200),   one(0177700), "#l@s", m68000up },
{"cmpil", 6,    one(0006200),   one(0177700), "#lDs", mcfisa_a },

...

Thanks,
Laurent

> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
> ---
>   target/m68k/cpu.c | 6 +-----
>   1 file changed, 1 insertion(+), 5 deletions(-)
>
> diff --git a/target/m68k/cpu.c b/target/m68k/cpu.c
> index c7aeb7da9c..5671067923 100644
> --- a/target/m68k/cpu.c
> +++ b/target/m68k/cpu.c
> @@ -75,12 +75,8 @@ static void m68k_cpu_reset(DeviceState *dev)
>   
>   static void m68k_cpu_disas_set_info(CPUState *s, disassemble_info *info)
>   {
> -    M68kCPU *cpu = M68K_CPU(s);
> -    CPUM68KState *env = &cpu->env;
>       info->print_insn = print_insn_m68k;
> -    if (m68k_feature(env, M68K_FEATURE_M68000)) {
> -        info->mach = bfd_mach_m68040;
> -    }
> +    info->mach = 0;
>   }
>   
>   /* CPU models */