bsd-user: Add target_to_host_semid_ds for semctl(2)

Add target_to_host_semid_ds() to convert target struct semid_ds to host
format for semctl(2) IPC_SET operations.

Signed-off-by: Stacey Son <sson@FreeBSD.org>
Signed-off-by: Mikael Urankar <mikael.urankar@gmail.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Warner Losh <imp@bsdimp.com>

bsd-user/bsd-misc.c

@@ -98,3 +98,21 @@ abi_long host_to_target_semarray(int semid, abi_ulong target_addr,
     unlock_user(array, target_addr, 1);
     return 0;
 }
+
+abi_long target_to_host_semid_ds(struct semid_ds *host_sd,
+        abi_ulong target_addr)
+{
+    struct target_semid_ds *target_sd;
+
+    if (!lock_user_struct(VERIFY_READ, target_sd, target_addr, 1)) {
+        return -TARGET_EFAULT;
+    }
+    target_to_host_ipc_perm__locked(&host_sd->sem_perm, &target_sd->sem_perm);
+    /* sem_base is not used by kernel for IPC_STAT/IPC_SET */
+    /* host_sd->sem_base  = g2h_untagged(target_sd->sem_base); */
+    __get_user(host_sd->sem_nsems, &target_sd->sem_nsems);
+    __get_user(host_sd->sem_otime, &target_sd->sem_otime);
+    __get_user(host_sd->sem_ctime, &target_sd->sem_ctime);
+    unlock_user_struct(target_sd, target_addr, 0);
+    return 0;
+}