diff --git a/libc/arch-sh/syscalls.mk b/libc/arch-sh/syscalls.mk
index b690bbf..3e2274f 100644
--- a/libc/arch-sh/syscalls.mk
+++ b/libc/arch-sh/syscalls.mk
@@ -75,6 +75,7 @@
 syscall_src += arch-sh/syscalls/ftruncate.S
 syscall_src += arch-sh/syscalls/getdents.S
 syscall_src += arch-sh/syscalls/fsync.S
+syscall_src += arch-sh/syscalls/fdatasync.S
 syscall_src += arch-sh/syscalls/fchown.S
 syscall_src += arch-sh/syscalls/sync.S
 syscall_src += arch-sh/syscalls/__fcntl64.S
diff --git a/libc/arch-sh/syscalls/fdatasync.S b/libc/arch-sh/syscalls/fdatasync.S
new file mode 100644
index 0000000..d81c33a
--- /dev/null
+++ b/libc/arch-sh/syscalls/fdatasync.S
@@ -0,0 +1,32 @@
+/* autogenerated by gensyscalls.py */
+#include <sys/linux-syscalls.h>
+
+    .text
+    .type fdatasync, @function
+    .globl fdatasync
+    .align 4
+
+fdatasync:
+
+    /* invoke trap */
+    mov.l   0f, r3  /* trap num */
+    trapa   #(1 + 0x10)
+
+    /* check return value */
+    cmp/pz  r0
+    bt      __NR_fdatasync_end
+
+    /* keep error number */
+    sts.l   pr, @-r15
+    mov.l   1f, r1
+    jsr     @r1
+    mov     r0, r4
+    lds.l   @r15+, pr
+
+__NR_fdatasync_end:
+    rts
+    nop
+
+    .align  2
+0:  .long   __NR_fdatasync
+1:  .long   __set_syscall_errno