[UNIKRAFT PATCH 3/5] lib/uktime: Register `gettimeofday` to syscall_shim

[Constantin Raducanu <raducanu.costi@xxxxxxxxx>]

Registers `gettimeofday` system call to syscall_shim library.
In order to avoid the unused warning for the second parameter,
I had to provide all three system call entry functions manually.

Signed-off-by: Constantin Raducanu <raducanu.costi@xxxxxxxxx>
---
 lib/uktime/Makefile.uk   |  2 ++
 lib/uktime/exportsyms.uk |  2 ++
 lib/uktime/time.c        | 32 +++++++++++++++++++++++++++-----
 3 files changed, 31 insertions(+), 5 deletions(-)

diff --git a/lib/uktime/Makefile.uk b/lib/uktime/Makefile.uk
index 2976a10..4fdf282 100644
--- a/lib/uktime/Makefile.uk
+++ b/lib/uktime/Makefile.uk
@@ -12,3 +12,5 @@ LIBUKTIME_SRCS-y += 
$(LIBUKTIME_BASE)/musl-imported/src/__tm_to_secs.c
 LIBUKTIME_SRCS-y += $(LIBUKTIME_BASE)/musl-imported/src/__year_to_secs.c
 LIBUKTIME_SRCS-y += $(LIBUKTIME_BASE)/time.c
 LIBUKTIME_SRCS-y += $(LIBUKTIME_BASE)/timer.c
+
+UK_PROVIDED_SYSCALLS-$(CONFIG_LIBUKTIME) += gettimeofday-2
\ No newline at end of file
diff --git a/lib/uktime/exportsyms.uk b/lib/uktime/exportsyms.uk
index 82b70b7..90ad7f9 100644
--- a/lib/uktime/exportsyms.uk
+++ b/lib/uktime/exportsyms.uk
@@ -2,6 +2,8 @@ clock_getres
 clock_gettime
 clock_settime
 gettimeofday
+uk_syscall_e_gettimeofday
+uk_syscall_r_gettimeofday
 nanosleep
 setitimer
 sleep
diff --git a/lib/uktime/time.c b/lib/uktime/time.c
index 4d3ba53..e45b6f4 100644
--- a/lib/uktime/time.c
+++ b/lib/uktime/time.c
@@ -43,6 +43,8 @@
 #include <uk/plat/time.h>
 #include <uk/config.h>
 #include <uk/print.h>
+#include <uk/syscall.h>
+
 #if CONFIG_HAVE_SCHED
 #include <uk/sched.h>
 #else
@@ -125,20 +127,40 @@ unsigned int sleep(unsigned int seconds)
        return 0;
 }
 
-int gettimeofday(struct timeval *tv, void *tz __unused)
+long uk_syscall_r_gettimeofday(long tv, long tz __unused)
 {
        __nsec now = ukplat_wall_clock();
 
        if (!tv) {
-               errno = EINVAL;
-               return -1;
+               return -EINVAL;
        }
 
-       tv->tv_sec = ukarch_time_nsec_to_sec(now);
-       tv->tv_usec = ukarch_time_nsec_to_usec(ukarch_time_subsec(now));
+       ((struct timeval*) tv)->tv_sec = ukarch_time_nsec_to_sec(now);
+       ((struct timeval*) tv)->tv_usec = 
+               ukarch_time_nsec_to_usec(ukarch_time_subsec(now));
+
        return 0;
 }
 
+long uk_syscall_e_gettimeofday(long tv, long tz __unused)
+{
+       long ret;
+
+       ret = uk_syscall_r_gettimeofday(tv, tz);
+       if (ret < 0) {
+               errno = (int) -ret;
+               return -1;
+       }
+       return 0;
+}
+
+#if !UK_LIBC_SYSCALL
+int gettimeofday (struct timeval* tv, void* tz __unused)
+{
+       return uk_syscall_e_gettimeofday((long) tv, (long)tz);
+}
+#endif
+
 int clock_getres(clockid_t clk_id __unused, struct timespec *res __unused)
 {
        return 0;
-- 
2.17.1