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From: "Philippe Mathieu-Daudé" <philmd@redhat.com>
To: Alistair Francis <alistair.francis@wdc.com>,
	qemu-devel@nongnu.org, qemu-riscv@nongnu.org, laurent@vivier.eu
Cc: alistair23@gmail.com, palmer@dabbelt.com
Subject: Re: [PATCH v9 2/4] linux-user/syscall: Add support for clock_gettime64/clock_settime64
Date: Thu, 19 Mar 2020 00:36:07 +0100
Message-ID: <c956f99f-0412-d0c9-c489-bf904b6d7bea@redhat.com> (raw)
In-Reply-To: <56b8fd28a0faca77ee8adfc90e4eb2bc3750edf5.1584571250.git.alistair.francis@wdc.com>

On 3/18/20 11:46 PM, Alistair Francis wrote:
> Add support for the clock_gettime64/clock_settime64 syscalls.
> 
> If your host is 64-bit or is 32-bit with the *_time64 syscall then the
> timespec will correctly be a 64-bit time_t. Otherwise the host will
> return a 32-bit time_t which will be rounded to 64-bits. This will be
> incorrect after y2038.
> 
> Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
> Reviewed-by: Laurent Vivier <laurent@vivier.eu>
> ---
>   linux-user/syscall.c | 39 +++++++++++++++++++++++++++++++++++++++
>   1 file changed, 39 insertions(+)
> 
> diff --git a/linux-user/syscall.c b/linux-user/syscall.c
> index 909bec94a5..60fd775d9c 100644
> --- a/linux-user/syscall.c
> +++ b/linux-user/syscall.c
> @@ -1229,6 +1229,22 @@ static inline abi_long target_to_host_timespec(struct timespec *host_ts,
>   }
>   #endif
>   
> +#if defined(TARGET_NR_clock_settime64)
> +static inline abi_long target_to_host_timespec64(struct timespec *host_ts,
> +                                                 abi_ulong target_addr)
> +{
> +    struct target__kernel_timespec *target_ts;
> +
> +    if (!lock_user_struct(VERIFY_READ, target_ts, target_addr, 1)) {
> +        return -TARGET_EFAULT;
> +    }
> +    __get_user(host_ts->tv_sec, &target_ts->tv_sec);
> +    __get_user(host_ts->tv_nsec, &target_ts->tv_nsec);
> +    unlock_user_struct(target_ts, target_addr, 0);
> +    return 0;
> +}
> +#endif
> +
>   static inline abi_long host_to_target_timespec(abi_ulong target_addr,
>                                                  struct timespec *host_ts)
>   {
> @@ -11458,6 +11474,18 @@ static abi_long do_syscall1(void *cpu_env, int num, abi_long arg1,
>           return ret;
>       }
>   #endif
> +#ifdef TARGET_NR_clock_settime64
> +    case TARGET_NR_clock_settime64:
> +    {
> +        struct timespec ts;
> +
> +        ret = target_to_host_timespec64(&ts, arg2);
> +        if (!is_error(ret)) {
> +            ret = get_errno(clock_settime(arg1, &ts));
> +        }
> +        return ret;
> +    }
> +#endif
>   #ifdef TARGET_NR_clock_gettime
>       case TARGET_NR_clock_gettime:
>       {
> @@ -11469,6 +11497,17 @@ static abi_long do_syscall1(void *cpu_env, int num, abi_long arg1,
>           return ret;
>       }
>   #endif
> +#ifdef TARGET_NR_clock_gettime64
> +    case TARGET_NR_clock_gettime64:
> +    {
> +        struct timespec ts;
> +        ret = get_errno(clock_gettime(arg1, &ts));
> +        if (!is_error(ret)) {
> +            ret = host_to_target_timespec64(arg2, &ts);
> +        }
> +        return ret;
> +    }
> +#endif
>   #ifdef TARGET_NR_clock_getres
>       case TARGET_NR_clock_getres:
>       {
> 

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



  reply index

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-18 22:46 [PATCH v9 0/4] linux-user: generate syscall_nr.sh for RISC-V Alistair Francis
2020-03-18 22:46 ` [PATCH v9 1/4] linux-user: Protect more syscalls Alistair Francis
2020-03-18 23:32   ` Philippe Mathieu-Daudé
2020-03-18 22:46 ` [PATCH v9 2/4] linux-user/syscall: Add support for clock_gettime64/clock_settime64 Alistair Francis
2020-03-18 23:36   ` Philippe Mathieu-Daudé [this message]
2020-03-18 22:47 ` [PATCH v9 3/4] linux-user: Support futex_time64 Alistair Francis
2020-03-25 17:41   ` Alistair Francis
2020-03-26  6:22     ` Laurent Vivier
2020-03-26 16:46       ` Alistair Francis
2020-03-18 22:47 ` [PATCH v9 4/4] linux-user/riscv: Update the syscall_nr's to the 5.5 kernel Alistair Francis
2020-03-19  0:39 ` [PATCH v9 0/4] linux-user: generate syscall_nr.sh for RISC-V no-reply
2020-03-19  1:13 ` no-reply

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