Add support for the Meta architecture

Meta cores are 32-bit, hardware multithreaded, general purpose, embedded
processors which also feature a DSP instruction set, and can be found in
many digital radios. They are capable of running different operating
systems on different hardware threads, for example a digital radio might
run RTOSes for DAB decoding and audio decoding on 3 hardware threads,
and run Linux on the 4th hardware thread to manage the user interface,
networking etc. HTPs are also capable of running SMP Linux on multiple
hardware threads.

Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>

1 files changed, 38 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/metag/brk.c b/libc/sysdeps/linux/metag/brk.c
new file mode 100644
index 000000000..355e88fc7
--- /dev/null
+++ b/libc/sysdeps/linux/metag/brk.c
@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) 2013 Imagination Technologies Ltd.
+ *
+ * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+ */
+
+#include <errno.h>
+#include <unistd.h>
+#include <sys/syscall.h>
+
+libc_hidden_proto(brk)
+
+/* This must be initialized data because commons can't have aliases.  */
+void * __curbrk attribute_hidden = 0;
+
+int brk (void *addr)
+{
+    void *newbrk;
+
+    __asm__ __volatile__ ("MOV D1Re0,%2\n\t"
+			  "MOV D1Ar1,%1\n\t"
+			  "SWITCH #0x440001\n\t"
+			  "MOV %0,D0Re0"
+			  : "=r" (newbrk)
+			  : "r" (addr), "K" (__NR_brk)
+			  : "D0Re0", "D1Re0", "D1Ar1");
+
+    __curbrk = newbrk;
+
+    if (newbrk < addr)
+    {
+	__set_errno (ENOMEM);
+	return -1;
+    }
+
+    return 0;
+}
+libc_hidden_def(brk)