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Diffstat (limited to 'include/libsharedobjs.h')
| -rw-r--r-- | include/libsharedobjs.h | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/include/libsharedobjs.h b/include/libsharedobjs.h new file mode 100644 index 0000000000..3801ccaca0 --- /dev/null +++ b/include/libsharedobjs.h @@ -0,0 +1,44 @@ +/* Copyright 2015 The Chromium OS Authors. All rights reserved. + * Use of this source code is governed by a BSD-style license that can be + * found in the LICENSE file. + * + * Helper macros for shared objects library. + */ +#ifndef __CROS_EC_LIBSHAREDOBJS_H +#define __CROS_EC_LIBSHAREDOBJS_H + +#include "common.h" + +#ifdef CONFIG_SHAREDLIB +/* + * The shared library currently only works with those platforms in which both + * the RO and RW images are loaded simultaneously in some executable memory. + * + * NOTE: I know that this doesn't cover all possible cases, but it will catch + * an obvious case. + */ +#if (CONFIG_RO_MEM_OFF == CONFIG_RW_MEM_OFF) +#error "The shared library is NOT compatible with this EC." +#endif + +/* + * All of the objects in the shared library will be placed into the '.roshared' + * section. The SHAREDLIB() macro simply adds this attribute and prevents the + * RW image from compiling them in. + */ +#undef SHAREDLIB +#ifdef SHAREDLIB_IMAGE +#define SHAREDLIB(...) __attribute__ ((section(".roshared"))) __VA_ARGS__ +#else /* !defined(SHAREDLIB_IMAGE) */ +#define SHAREDLIB(...) +#endif /* defined(SHAREDLIB_IMAGE) */ +#define SHAREDLIB_FUNC(...) \ + extern __VA_ARGS__ __attribute__ ((section(".roshared.text"))) + +#else /* !defined(CONFIG_SHAREDLIB) */ + +/* By default, the SHAREDLIB() macro maps to its contents. */ +#define SHAREDLIB(...) __VA_ARGS__ +#define SHAREDLIB_FUNC(...) __VA_ARGS__ +#endif /* defined(CONFIG_SHAREDLIB) */ +#endif /* __CROS_EC_LIBSHAREDOBJS_H */ |