diff --git a/linux-user/mips/cpu_loop.c b/linux-user/mips/cpu_loop.c
index 39915b3..b81479b 100644
--- a/linux-user/mips/cpu_loop.c
+++ b/linux-user/mips/cpu_loop.c
@@ -25,8 +25,9 @@
 #include "internal.h"
 
 # ifdef TARGET_ABI_MIPSO32
+#  define MIPS_SYSCALL_NUMBER_UNUSED -1
 #  define MIPS_SYS(name, args) args,
-static const uint8_t mips_syscall_args[] = {
+static const int8_t mips_syscall_args[] = {
         MIPS_SYS(sys_syscall    , 8)    /* 4000 */
         MIPS_SYS(sys_exit       , 1)
         MIPS_SYS(sys_fork       , 0)
@@ -390,6 +391,75 @@ static const uint8_t mips_syscall_args[] = {
         MIPS_SYS(sys_copy_file_range, 6) /* 360 */
         MIPS_SYS(sys_preadv2, 6)
         MIPS_SYS(sys_pwritev2, 6)
+        MIPS_SYS(sys_pkey_mprotect, 4)
+        MIPS_SYS(sys_pkey_alloc, 2)
+        MIPS_SYS(sys_pkey_free, 1)                 /* 365 */
+        MIPS_SYS(sys_statx, 5)
+        MIPS_SYS(sys_rseq, 4)
+        MIPS_SYS(sys_io_pgetevents, 6)
+        MIPS_SYSCALL_NUMBER_UNUSED,
+        MIPS_SYSCALL_NUMBER_UNUSED,                /* 370 */
+        MIPS_SYSCALL_NUMBER_UNUSED,
+        MIPS_SYSCALL_NUMBER_UNUSED,
+        MIPS_SYSCALL_NUMBER_UNUSED,
+        MIPS_SYSCALL_NUMBER_UNUSED,
+        MIPS_SYSCALL_NUMBER_UNUSED,                /* 375 */
+        MIPS_SYSCALL_NUMBER_UNUSED,
+        MIPS_SYSCALL_NUMBER_UNUSED,
+        MIPS_SYSCALL_NUMBER_UNUSED,
+        MIPS_SYSCALL_NUMBER_UNUSED,
+        MIPS_SYSCALL_NUMBER_UNUSED,                /* 380 */
+        MIPS_SYSCALL_NUMBER_UNUSED,
+        MIPS_SYSCALL_NUMBER_UNUSED,
+        MIPS_SYSCALL_NUMBER_UNUSED,
+        MIPS_SYSCALL_NUMBER_UNUSED,
+        MIPS_SYSCALL_NUMBER_UNUSED,                /* 385 */
+        MIPS_SYSCALL_NUMBER_UNUSED,
+        MIPS_SYSCALL_NUMBER_UNUSED,
+        MIPS_SYSCALL_NUMBER_UNUSED,
+        MIPS_SYSCALL_NUMBER_UNUSED,
+        MIPS_SYSCALL_NUMBER_UNUSED,                /* 390 */
+        MIPS_SYSCALL_NUMBER_UNUSED,
+        MIPS_SYSCALL_NUMBER_UNUSED,
+        MIPS_SYS(sys_semget, 3)
+        MIPS_SYS(sys_semctl, 4)
+        MIPS_SYS(sys_shmget, 3)                    /* 395 */
+        MIPS_SYS(sys_shmctl, 3)
+        MIPS_SYS(sys_shmat, 3)
+        MIPS_SYS(sys_shmdt, 1)
+        MIPS_SYS(sys_msgget, 2)
+        MIPS_SYS(sys_msgsnd, 4)                    /* 400 */
+        MIPS_SYS(sys_msgrcv, 5)
+        MIPS_SYS(sys_msgctl, 3)
+        MIPS_SYS(sys_timer_gettime64, 2)
+        MIPS_SYS(sys_timer_settime64, 4)
+        MIPS_SYS(sys_timerfd_gettime64, 2)         /* 410 */
+        MIPS_SYS(sys_timerfd_settime64, 4)
+        MIPS_SYS(sys_utimensat_time64, 4)
+        MIPS_SYS(sys_pselect6_time64, 6)
+        MIPS_SYS(sys_ppoll_time64, 5)
+        MIPS_SYSCALL_NUMBER_UNUSED,                /* 415 */
+        MIPS_SYS(sys_io_pgetevents_time64, 6)
+        MIPS_SYS(sys_recvmmsg_time64, 5)
+        MIPS_SYS(sys_mq_timedsend_time64, 5)
+        MIPS_SYS(sys_mq_timedreceive_time64, 5)
+        MIPS_SYS(sys_semtimedop_time64, 4)         /* 420 */
+        MIPS_SYS(sys_rt_sigtimedwait_time64, 4)
+        MIPS_SYS(sys_futex_time64, 6)
+        MIPS_SYS(sys_sched_rr_get_interval_time64, 2)
+        MIPS_SYS(sys_pidfd_send_signal, 4)
+        MIPS_SYS(sys_io_uring_setup, 2)            /* 425 */
+        MIPS_SYS(sys_io_uring_enter, 6)
+        MIPS_SYS(sys_io_uring_register, 4)
+        MIPS_SYS(sys_open_tree, 3)
+        MIPS_SYS(sys_move_mount, 5)
+        MIPS_SYS(sys_fsopen, 2)                    /* 430 */
+        MIPS_SYS(sys_fsconfig, 5)
+        MIPS_SYS(sys_fsmount, 3)
+        MIPS_SYS(sys_fspick, 3)
+        MIPS_SYS(sys_pidfd_open, 2)
+        MIPS_SYS(sys_clone3, 2)                    /* 435 */
+
 };
 #  undef MIPS_SYS
 # endif /* O32 */
@@ -447,8 +517,14 @@ void cpu_loop(CPUMIPSState *env)
 # ifdef TARGET_ABI_MIPSO32
             syscall_num = env->active_tc.gpr[2] - 4000;
             if (syscall_num >= sizeof(mips_syscall_args)) {
+                /* syscall_num is larger that any defined for MIPS O32 */
+                ret = -TARGET_ENOSYS;
+            } else if (mips_syscall_args[syscall_num] ==
+                       MIPS_SYSCALL_NUMBER_UNUSED) {
+                /* syscall_num belongs to the range not defined for MIPS O32 */
                 ret = -TARGET_ENOSYS;
             } else {
+                /* syscall_num is valid */
                 int nb_args;
                 abi_ulong sp_reg;
                 abi_ulong arg5 = 0, arg6 = 0, arg7 = 0, arg8 = 0;
diff --git a/linux-user/mips/syscall_nr.h b/linux-user/mips/syscall_nr.h
index 7fa7fa5..0be3af1 100644
--- a/linux-user/mips/syscall_nr.h
+++ b/linux-user/mips/syscall_nr.h
@@ -376,5 +376,50 @@
 #define TARGET_NR_statx                 (TARGET_NR_Linux + 366)
 #define TARGET_NR_rseq                  (TARGET_NR_Linux + 367)
 #define TARGET_NR_io_pgetevents         (TARGET_NR_Linux + 368)
+/* room for arch specific calls */
+#define TARGET_NR_semget                (TARGET_NR_Linux + 393)
+#define TARGET_NR_semctl                (TARGET_NR_Linux + 394)
+#define TARGET_NR_shmget                (TARGET_NR_Linux + 395)
+#define TARGET_NR_shmctl                (TARGET_NR_Linux + 396)
+#define TARGET_NR_shmat                 (TARGET_NR_Linux + 397)
+#define TARGET_NR_shmdt                 (TARGET_NR_Linux + 398)
+#define TARGET_NR_msgget                (TARGET_NR_Linux + 399)
+#define TARGET_NR_msgsnd                (TARGET_NR_Linux + 400)
+#define TARGET_NR_msgrcv                (TARGET_NR_Linux + 401)
+#define TARGET_NR_msgctl                (TARGET_NR_Linux + 402)
+/* 403-423 common for 32-bit archs */
+#define TARGET_NR_clock_gettime64              (TARGET_NR_Linux + 403)
+#define TARGET_NR_clock_settime64              (TARGET_NR_Linux + 404)
+#define TARGET_NR_clock_adjtime64              (TARGET_NR_Linux + 405)
+#define TARGET_NR_clock_getres_time64          (TARGET_NR_Linux + 406)
+#define TARGET_NR_clock_nanosleep_time64       (TARGET_NR_Linux + 407)
+#define TARGET_NR_timer_gettime64              (TARGET_NR_Linux + 408)
+#define TARGET_NR_timer_settime64              (TARGET_NR_Linux + 409)
+#define TARGET_NR_timerfd_gettime64            (TARGET_NR_Linux + 410)
+#define TARGET_NR_timerfd_settime64            (TARGET_NR_Linux + 411)
+#define TARGET_NR_utimensat_time64             (TARGET_NR_Linux + 412)
+#define TARGET_NR_pselect6_time64              (TARGET_NR_Linux + 413)
+#define TARGET_NR_ppoll_time64                 (TARGET_NR_Linux + 414)
+#define TARGET_NR_io_pgetevents_time64         (TARGET_NR_Linux + 416)
+#define TARGET_NR_recvmmsg_time64              (TARGET_NR_Linux + 417)
+#define TARGET_NR_mq_timedsend_time64          (TARGET_NR_Linux + 418)
+#define TARGET_NR_mq_timedreceive_time64       (TARGET_NR_Linux + 419)
+#define TARGET_NR_semtimedop_time64            (TARGET_NR_Linux + 420)
+#define TARGET_NR_rt_sigtimedwait_time64       (TARGET_NR_Linux + 421)
+#define TARGET_NR_futex_time64                 (TARGET_NR_Linux + 422)
+#define TARGET_NR_sched_rr_get_interval_time64 (TARGET_NR_Linux + 423)
+/* 424 onwards common for all archs */
+#define TARGET_NR_pidfd_send_signal            (TARGET_NR_Linux + 424)
+#define TARGET_NR_io_uring_setup               (TARGET_NR_Linux + 425)
+#define TARGET_NR_io_uring_enter               (TARGET_NR_Linux + 426)
+#define TARGET_NR_io_uring_register            (TARGET_NR_Linux + 427)
+#define TARGET_NR_open_tree                    (TARGET_NR_Linux + 428)
+#define TARGET_NR_move_mount                   (TARGET_NR_Linux + 429)
+#define TARGET_NR_fsopen                       (TARGET_NR_Linux + 430)
+#define TARGET_NR_fsconfig                     (TARGET_NR_Linux + 431)
+#define TARGET_NR_fsmount                      (TARGET_NR_Linux + 432)
+#define TARGET_NR_fspick                       (TARGET_NR_Linux + 433)
+#define TARGET_NR_pidfd_open                   (TARGET_NR_Linux + 434)
+#define TARGET_NR_clone3                       (TARGET_NR_Linux + 435)
 
 #endif
diff --git a/linux-user/mips64/syscall_nr.h b/linux-user/mips64/syscall_nr.h
index db40f69..c86943a 100644
--- a/linux-user/mips64/syscall_nr.h
+++ b/linux-user/mips64/syscall_nr.h
@@ -674,6 +674,19 @@
 #define TARGET_NR_statx                 (TARGET_NR_Linux + 326)
 #define TARGET_NR_rseq                  (TARGET_NR_Linux + 327)
 #define TARGET_NR_io_pgetevents         (TARGET_NR_Linux + 328)
+/* 329 through 423 are reserved to sync up with other architectures */
+#define TARGET_NR_pidfd_send_signal     (TARGET_NR_Linux + 424)
+#define TARGET_NR_io_uring_setup        (TARGET_NR_Linux + 425)
+#define TARGET_NR_io_uring_enter        (TARGET_NR_Linux + 426)
+#define TARGET_NR_io_uring_register     (TARGET_NR_Linux + 427)
+#define TARGET_NR_open_tree             (TARGET_NR_Linux + 428)
+#define TARGET_NR_move_mount            (TARGET_NR_Linux + 429)
+#define TARGET_NR_fsopen                (TARGET_NR_Linux + 430)
+#define TARGET_NR_fsconfig              (TARGET_NR_Linux + 431)
+#define TARGET_NR_fsmount               (TARGET_NR_Linux + 432)
+#define TARGET_NR_fspick                (TARGET_NR_Linux + 433)
+#define TARGET_NR_pidfd_open            (TARGET_NR_Linux + 434)
+#define TARGET_NR_clone3                (TARGET_NR_Linux + 435)
 #endif
 
 #endif
