Re: [PATCH] linux-user: Fix mips fp64 executables loading

[Jiaxun Yang]

> 2023年4月4日 06:21，Daniil Kovalev <dkovalev@compiler-toolchain-for.me> 写道：
> 
> If a program requires fr1, we should set the FR bit of CP0 control status
> register and add F64 hardware flag. The corresponding `else if` branch
> statement is copied from the linux kernel sources (see `arch_check_elf` 
> function
> in linux/arch/mips/kernel/elf.c).
> 
> Signed-off-by: Daniil Kovalev <dkovalev@compiler-toolchain-for.me>

Reviewed-by: Jiaxun Yang <jiaxun.yang@flygoat.com>

Thanks!

> ---
> linux-user/mips/cpu_loop.c | 5 ++++-
> 1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/linux-user/mips/cpu_loop.c b/linux-user/mips/cpu_loop.c
> index d5c1c7941d..8735e58bad 100644
> --- a/linux-user/mips/cpu_loop.c
> +++ b/linux-user/mips/cpu_loop.c
> @@ -290,7 +290,10 @@ void target_cpu_copy_regs(CPUArchState *env, struct 
> target_pt_regs *regs)
>             env->CP0_Status |= (1 << CP0St_FR);
>             env->hflags |= MIPS_HFLAG_F64;
>         }
> -    } else  if (!prog_req.fre && !prog_req.frdefault &&
> +    } else if (prog_req.fr1) {
> +        env->CP0_Status |= (1 << CP0St_FR);
> +        env->hflags |= MIPS_HFLAG_F64;
> +    } else if (!prog_req.fre && !prog_req.frdefault &&
>           !prog_req.fr1 && !prog_req.single && !prog_req.soft) {
>         fprintf(stderr, "qemu: Can't find a matching FPU mode\n");
>         exit(1);
> -- 
> 2.40.0
>