buflib: Add malloc-backed buflib

This is intended for improving the effectiveness of tools like
ASAN when debugging memory errors in the sim. It's not meant to
be a serious allocator for hosted targets.

Enable it by changing the buflib backend in config.h.

Change-Id: I0cf23cefa47ee35dede7b49e0e5b72dac60e8d3e

1 files changed, 53 insertions, 0 deletions

diff --git a/firmware/include/buflib_malloc.h b/firmware/include/buflib_malloc.h
new file mode 100644
index 0000000000..32c837e7b7
--- /dev/null
+++ b/firmware/include/buflib_malloc.h
@@ -0,0 +1,53 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2023 Aidan MacDonald
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#ifndef _BUFLIB_MALLOC_H_
+#define _BUFLIB_MALLOC_H_
+
+#ifndef _BUFLIB_H_
+# error "include buflib.h instead"
+#endif
+
+struct buflib_malloc_handle
+{
+    void *data;
+    void *user;
+    size_t size;
+    unsigned int pin_count;
+    struct buflib_callbacks *ops;
+};
+
+struct buflib_context
+{
+    struct buflib_malloc_handle *allocs;
+    size_t num_allocs;
+
+    void *buf;
+    size_t bufsize;
+};
+
+#ifndef BUFLIB_DEBUG_GET_DATA
+static inline void *buflib_get_data(struct buflib_context *ctx, int handle)
+{
+    return ctx->allocs[handle - 1].user;
+}
+#endif
+
+#endif /* _BUFLIB_MALLOC_H_ */