Re: [Qemu-devel] [PATCH v2 12/15] target/arm/arm-semi: Factor out implementation of SYS_FLEN

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

On 9/16/19 4:15 PM, Peter Maydell wrote:
> Factor out the implementation of SYS_FLEN via the new
> function tables.
> 
> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>

> ---
>   target/arm/arm-semi.c | 32 ++++++++++++++++++++++----------
>   1 file changed, 22 insertions(+), 10 deletions(-)
> 
> diff --git a/target/arm/arm-semi.c b/target/arm/arm-semi.c
> index b5e1d73eb80..87c911f0187 100644
> --- a/target/arm/arm-semi.c
> +++ b/target/arm/arm-semi.c
> @@ -391,6 +391,7 @@ typedef uint32_t sys_readfn(ARMCPU *cpu, GuestFD *gf,
>   typedef uint32_t sys_isattyfn(ARMCPU *cpu, GuestFD *gf);
>   typedef uint32_t sys_seekfn(ARMCPU *cpu, GuestFD *gf,
>                               target_ulong offset);
> +typedef uint32_t sys_flenfn(ARMCPU *cpu, GuestFD *gf);
>   
>   static uint32_t host_closefn(ARMCPU *cpu, GuestFD *gf)
>   {
> @@ -454,6 +455,17 @@ static uint32_t host_seekfn(ARMCPU *cpu, GuestFD *gf, target_ulong offset)
>       return 0;
>   }
>   
> +static uint32_t host_flenfn(ARMCPU *cpu, GuestFD *gf)
> +{
> +    CPUARMState *env = &cpu->env;
> +    struct stat buf;
> +    uint32_t ret = set_swi_errno(env, fstat(gf->hostfd, &buf));
> +    if (ret == (uint32_t)-1) {
> +        return -1;
> +    }
> +    return buf.st_size;
> +}
> +
>   static uint32_t gdb_closefn(ARMCPU *cpu, GuestFD *gf)
>   {
>       return arm_gdb_syscall(cpu, arm_semi_cb, "close,%x", gf->hostfd);
> @@ -486,12 +498,19 @@ static uint32_t gdb_seekfn(ARMCPU *cpu, GuestFD *gf, target_ulong offset)
>                              gf->hostfd, offset);
>   }
>   
> +static uint32_t gdb_flenfn(ARMCPU *cpu, GuestFD *gf)
> +{
> +    return arm_gdb_syscall(cpu, arm_semi_flen_cb, "fstat,%x,%x",
> +                           gf->hostfd, arm_flen_buf(cpu));
> +}
> +
>   typedef struct GuestFDFunctions {
>       sys_closefn *closefn;
>       sys_writefn *writefn;
>       sys_readfn *readfn;
>       sys_isattyfn *isattyfn;
>       sys_seekfn *seekfn;
> +    sys_flenfn *flenfn;
>   } GuestFDFunctions;
>   
>   static const GuestFDFunctions guestfd_fns[] = {
> @@ -501,6 +520,7 @@ static const GuestFDFunctions guestfd_fns[] = {
>           .readfn = host_readfn,
>           .isattyfn = host_isattyfn,
>           .seekfn = host_seekfn,
> +        .flenfn = host_flenfn,
>       },
>       [GuestFDGDB] = {
>           .closefn = gdb_closefn,
> @@ -508,6 +528,7 @@ static const GuestFDFunctions guestfd_fns[] = {
>           .readfn = gdb_readfn,
>           .isattyfn = gdb_isattyfn,
>           .seekfn = gdb_seekfn,
> +        .flenfn = gdb_flenfn,
>       },
>   };
>   
> @@ -687,16 +708,7 @@ target_ulong do_arm_semihosting(CPUARMState *env)
>               return set_swi_errno(env, -1);
>           }
>   
> -        if (use_gdb_syscalls()) {
> -            return arm_gdb_syscall(cpu, arm_semi_flen_cb, "fstat,%x,%x",
> -                                   gf->hostfd, arm_flen_buf(cpu));
> -        } else {
> -            struct stat buf;
> -            ret = set_swi_errno(env, fstat(gf->hostfd, &buf));
> -            if (ret == (uint32_t)-1)
> -                return -1;
> -            return buf.st_size;
> -        }
> +        return guestfd_fns[gf->type].flenfn(cpu, gf);
>       case TARGET_SYS_TMPNAM:
>           qemu_log_mask(LOG_UNIMP, "%s: SYS_TMPNAM not implemented", __func__);
>           return -1;
>