add dummy_malloc functions

For some environments the dummy malloc functions offer a very small
alternative implementation. malloc will get its memory from sbrk()
and never frees memory again.
This of course is not suitable for interactive environments and thus
depends on CONFIG_SHELL_NONE

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 26 insertions, 0 deletions

diff --git a/common/dummy_malloc.c b/common/dummy_malloc.c
new file mode 100644
index 0000000000..213e51d851
--- /dev/null
+++ b/common/dummy_malloc.c
@@ -0,0 +1,26 @@
+#include <common.h>
+#include <malloc.h>
+
+void *memalign(size_t alignment, size_t bytes)
+{
+	unsigned long mem = (unsigned long)sbrk(bytes + alignment);
+
+	mem = (mem + alignment) & ~(alignment - 1);
+
+	return (void *)mem;
+}
+
+void *malloc(size_t size)
+{
+	return memalign(8, size);
+}
+
+void free(void *ptr)
+{
+}
+
+void *realloc(void *ptr, size_t size)
+{
+	BUG();
+}
+