1 files changed, 43 insertions, 0 deletions
diff --git a/newlib/libc/sys/arc/sbrk.c b/newlib/libc/sys/arc/sbrk.c
new file mode 100644
index 000000000..9f863cded
--- /dev/null
+++ b/newlib/libc/sys/arc/sbrk.c
@@ -0,0 +1,43 @@
+/* sbrk support */
+
+/* The current plan is to have one sbrk handler for all cpus.
+   Hence use `asm' for each global variable here to avoid the cpu prefix.
+   We can't intrude on the user's namespace (another reason to use asm).  */
+
+#include <sys/types.h>
+#include <sys/syscall.h>
+#include <errno.h>
+#include <stddef.h>
+
+/* These variables are publicly accessible for debugging purposes.
+   The user is also free to set sbrk_size to something different.
+   See mem-layout.c.  */
+
+extern int sbrk_size asm ("sbrk_size");
+
+caddr_t sbrk_start asm ("sbrk_start");
+caddr_t sbrk_loc asm ("sbrk_loc");
+
+/*caddr_t _sbrk_r (struct _reent *, size_t) asm ("__sbrk_r");*/
+
+/* FIXME: We need a semaphore here.  */
+
+caddr_t
+_sbrk_r (struct _reent *r, size_t nbytes)
+{
+  caddr_t result;
+
+  if (
+      /* Ensure we don't underflow.  */
+      sbrk_loc + nbytes < sbrk_start
+      /* Ensure we don't overflow.  */
+      || sbrk_loc + nbytes > sbrk_start + sbrk_size)
+    {
+      errno = ENOMEM;
+      return ((caddr_t) -1);
+    }
+
+  result = sbrk_loc;
+  sbrk_loc += nbytes;
+  return result;
+}