tools/nolibc/gettimeofday: avoid libgcc 64-bit divisions

timespec::tv_nsec is going to be 64-bit wide even on 32-bit
architectures. As not all architectures support 64-bit division
instructions, calls to libgcc (__divdi3()) may be emitted by the
compiler which are not provided by nolibc.

As tv_nsec is guaranteed to always fit into an uint32_t, perform a
32-bit division instead.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://patch.msgid.link/20251220-nolibc-uapi-types-v3-6-c662992f75d7@weissschuh.net

diff --git a/tools/include/nolibc/sys/time.h b/tools/include/nolibc/sys/time.h
index 171187836e6dfcde3474b3778eae4cb8ea5d72ec..afdb7e326df1703a49e24a8c3182e5aecb12c77e 100644 (file)
--- a/tools/include/nolibc/sys/time.h
+++ b/tools/include/nolibc/sys/time.h
@@ -30,7 +30,7 @@ int sys_gettimeofday(struct timeval *tv, struct timezone *tz)
        ret = sys_clock_gettime(CLOCK_REALTIME, &tp);
        if (!ret && tv) {
                tv->tv_sec = tp.tv_sec;
-               tv->tv_usec = tp.tv_nsec / 1000;
+               tv->tv_usec = (uint32_t)tp.tv_nsec / 1000;
        }
 
        return ret;