From cac46eb021fbbac77f1f98223b19608f31fc2236 Mon Sep 17 00:00:00 2001 From: Filip Bozuta Date: Tue, 25 Aug 2020 00:30:50 +0200 Subject: [PATCH] linux-user: Add support for utimensat_time64() and semtimedop_time64() This patch introduces functionality for following time64 syscalls: *utimensat_time64() int utimensat(int dirfd, const char *pathname, const struct timespec times[2], int flags); -- change file timestamps with nanosecond precision -- man page: https://man7.org/linux/man-pages/man2/utimensat.2.html *semtimedop_time64() int semtimedop(int semid, struct sembuf *sops, size_t nsops, const struct timespec *timeout); -- System V semaphore operations -- man page: https://www.man7.org/linux/man-pages/man2/semtimedop.2.html Implementation notes: Syscall 'utimensat_time64()' is implemented in similar way as its regular variants only difference being that time64 converting function is used to convert values of 'struct timespec' between host and target ('target_to_host_timespec64()'). For syscall 'semtimedop_time64()' and additional argument is added in function 'do_semtimedop()' through which the aproppriate 'struct timespec' converting function is called (false for regular target_to_host_timespec() and true for target_to_host_timespec64()). For 'do_ipc()' a check was added as that additional argument: 'TARGET_ABI_BITS == 64'. Signed-off-by: Filip Bozuta Reviewed-by: Laurent Vivier Message-Id: <20200824223050.92032-3-Filip.Bozuta@syrmia.com> Signed-off-by: Laurent Vivier --- linux-user/syscall.c | 64 ++++++++++++++++++++++++++++++++++++-------- 1 file changed, 53 insertions(+), 11 deletions(-) diff --git a/linux-user/syscall.c b/linux-user/syscall.c index 188363f72e..d14d849a72 100644 --- a/linux-user/syscall.c +++ b/linux-user/syscall.c @@ -391,7 +391,7 @@ static bitmask_transtbl fcntl_flags_tbl[] = { _syscall2(int, sys_getcwd1, char *, buf, size_t, size) -#ifdef TARGET_NR_utimensat +#if defined(TARGET_NR_utimensat) || defined(TARGET_NR_utimensat_time64) #if defined(__NR_utimensat) #define __NR_sys_utimensat __NR_utimensat _syscall4(int,sys_utimensat,int,dirfd,const char *,pathname, @@ -1244,7 +1244,10 @@ static inline abi_long target_to_host_timespec(struct timespec *host_ts, defined(TARGET_NR_mq_timedreceive_time64) || \ (defined(TARGET_NR_timerfd_settime64) && defined(CONFIG_TIMERFD)) || \ defined(TARGET_NR_clock_nanosleep_time64) || \ - defined(TARGET_NR_rt_sigtimedwait_time64) + defined(TARGET_NR_rt_sigtimedwait_time64) || \ + defined(TARGET_NR_utimensat) || \ + defined(TARGET_NR_utimensat_time64) || \ + defined(TARGET_NR_semtimedop_time64) static inline abi_long target_to_host_timespec64(struct timespec *host_ts, abi_ulong target_addr) { @@ -3879,7 +3882,7 @@ static inline abi_long target_to_host_sembuf(struct sembuf *host_sembuf, } #if defined(TARGET_NR_ipc) || defined(TARGET_NR_semop) || \ - defined(TARGET_NR_semtimedop) + defined(TARGET_NR_semtimedop) || defined(TARGET_NR_semtimedop_time64) /* * This macro is required to handle the s390 variants, which passes the @@ -3896,7 +3899,7 @@ static inline abi_long target_to_host_sembuf(struct sembuf *host_sembuf, static inline abi_long do_semtimedop(int semid, abi_long ptr, unsigned nsops, - abi_long timeout) + abi_long timeout, bool time64) { struct sembuf *sops; struct timespec ts, *pts = NULL; @@ -3904,8 +3907,14 @@ static inline abi_long do_semtimedop(int semid, if (timeout) { pts = &ts; - if (target_to_host_timespec(pts, timeout)) { - return -TARGET_EFAULT; + if (time64) { + if (target_to_host_timespec64(pts, timeout)) { + return -TARGET_EFAULT; + } + } else { + if (target_to_host_timespec(pts, timeout)) { + return -TARGET_EFAULT; + } } } @@ -4428,7 +4437,7 @@ static abi_long do_ipc(CPUArchState *cpu_env, switch (call) { case IPCOP_semop: - ret = do_semtimedop(first, ptr, second, 0); + ret = do_semtimedop(first, ptr, second, 0, false); break; case IPCOP_semtimedop: /* @@ -4438,9 +4447,9 @@ static abi_long do_ipc(CPUArchState *cpu_env, * to a struct timespec where the generic variant uses fifth parameter. */ #if defined(TARGET_S390X) - ret = do_semtimedop(first, ptr, second, third); + ret = do_semtimedop(first, ptr, second, third, TARGET_ABI_BITS == 64); #else - ret = do_semtimedop(first, ptr, second, fifth); + ret = do_semtimedop(first, ptr, second, fifth, TARGET_ABI_BITS == 64); #endif break; @@ -9949,11 +9958,15 @@ static abi_long do_syscall1(void *cpu_env, int num, abi_long arg1, #endif #ifdef TARGET_NR_semop case TARGET_NR_semop: - return do_semtimedop(arg1, arg2, arg3, 0); + return do_semtimedop(arg1, arg2, arg3, 0, false); #endif #ifdef TARGET_NR_semtimedop case TARGET_NR_semtimedop: - return do_semtimedop(arg1, arg2, arg3, arg4); + return do_semtimedop(arg1, arg2, arg3, arg4, false); +#endif +#ifdef TARGET_NR_semtimedop_time64 + case TARGET_NR_semtimedop_time64: + return do_semtimedop(arg1, arg2, arg3, arg4, true); #endif #ifdef TARGET_NR_semctl case TARGET_NR_semctl: @@ -12160,6 +12173,35 @@ static abi_long do_syscall1(void *cpu_env, int num, abi_long arg1, } return ret; #endif +#ifdef TARGET_NR_utimensat_time64 + case TARGET_NR_utimensat_time64: + { + struct timespec *tsp, ts[2]; + if (!arg3) { + tsp = NULL; + } else { + if (target_to_host_timespec64(ts, arg3)) { + return -TARGET_EFAULT; + } + if (target_to_host_timespec64(ts + 1, arg3 + + sizeof(struct target__kernel_timespec))) { + return -TARGET_EFAULT; + } + tsp = ts; + } + if (!arg2) + ret = get_errno(sys_utimensat(arg1, NULL, tsp, arg4)); + else { + p = lock_user_string(arg2); + if (!p) { + return -TARGET_EFAULT; + } + ret = get_errno(sys_utimensat(arg1, path(p), tsp, arg4)); + unlock_user(p, arg2, 0); + } + } + return ret; +#endif #ifdef TARGET_NR_futex case TARGET_NR_futex: return do_futex(arg1, arg2, arg3, arg4, arg5, arg6);