Initial version of the CRIS port.

1 files changed, 36 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/cris/sbrk.c b/libc/sysdeps/linux/cris/sbrk.c
new file mode 100644
index 000000000..79d924a44
--- /dev/null
+++ b/libc/sysdeps/linux/cris/sbrk.c
@@ -0,0 +1,36 @@
+/* From libc-5.3.12 */
+
+#include <unistd.h>
+#include <sys/syscall.h>
+#include <errno.h>
+#include "sysdep.h"
+
+extern void * ___brk_addr;
+
+extern int __init_brk (void);
+
+void *
+sbrk(intptr_t increment)
+{
+	if (__init_brk () == 0) {
+		void * tmp = ___brk_addr + increment;
+
+		/* Notice that we don't need to save/restore the GOT
+		 * register since that is not call clobbered by the syscall
+		 */
+		
+		asm ("move.d %1,$r10\n\t"
+		     "movu.w " STR(__NR_brk) ",$r9\n\t"
+		     "break 13\n\t"
+		     "move.d $r10, %0"
+		     : "=r" (___brk_addr)
+		     : "g" (tmp)
+		     : "r9", "r10");
+
+		if (___brk_addr == tmp)
+			return tmp - increment;
+		__set_errno(ENOMEM);
+		return ((void *) -1);
+	}
+	return ((void *) -1);
+}