1 files changed, 25 insertions, 0 deletions
diff --git a/usr/klibc/arch/arm64/syscall.S b/usr/klibc/arch/arm64/syscall.S
new file mode 100644
index 0000000..e100412
--- /dev/null
+++ b/usr/klibc/arch/arm64/syscall.S
@@ -0,0 +1,25 @@
+/*
+ * arch/arm64/syscall.S
+ *
+ * System call common handling - if the return
+ * value from the system call is negative, then
+ * extract the magnitude and return it as errno and
+ * return -1, if the return value is 0 that is
+ * success case.
+ */
+
+	.type	__syscall_common,#function
+	.globl  __syscall_common
+	.balign 8
+
+__syscall_common:
+	cmp	x0, #0x0
+	b.ge	2f
+	neg	x0, x0
+	ldr	x8, 1f
+	str	w0, [x8]
+	mov	x0, #-1
+2:
+	ret
+1:
+	.dword	errno