[Minios-devel] [UNIKRAFT PATCHv6 03/23] plat/common: Move global variables defined in link scripts to a header

[Jia He <justin.he@xxxxxxx>]

From: Wei Chen <wei.chen@xxxxxxx>
The global variables defined in link scripts like _text, _etext and _end
are declared in multiple files. We use a header to include these global
variables to avoid so many duplicated declarations.

Signed-off-by: Wei Chen <wei.chen@xxxxxxx>
Signed-off-by: Jia He <justin.he@xxxxxxx>
Reviewed-by: Sharan Santhanam <sharan.santhanam@xxxxxxxxx>
---
 plat/common/include/sections.h | 65 ++++++++++++++++++++++++++++++++++
 1 file changed, 65 insertions(+)
 create mode 100644 plat/common/include/sections.h

diff --git a/plat/common/include/sections.h b/plat/common/include/sections.h
new file mode 100644
index 0000000..42f41d2
--- /dev/null
+++ b/plat/common/include/sections.h
@@ -0,0 +1,65 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
+/*
+ * Authors: Wei Chen <wei.chen@xxxxxxx>
+ *
+ * Copyright (c) 2018, Arm Ltd. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the copyright holder nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * THIS HEADER MAY NOT BE EXTRACTED OR MODIFIED IN ANY WAY.
+ */
+
+#ifndef __PLAT_CMN_SECTIONS_H__
+#define __PLAT_CMN_SECTIONS_H__
+
+/*
+ * Following global variables are defined in image link scripts, and some
+ * variables are optional and may be unavailable on some architectures
+ * or configurations.
+ */
+
+/* _dtb: start of device tree */
+extern char _dtb[];
+
+/* [_text, _etext]: contains .text.* sections */
+extern char _text[], _etext[];
+
+/* [_rodata, _erodata]: contains .rodata.* sections */
+extern char _rodata[], _erodata[];
+
+/* [_data, _edata]: contains .data.* sections */
+extern char _data[], _edata[];
+
+/* [_ctors, _ectors]: contains constructor tables (read-only) */
+extern char _ctors[], _ectors[];
+
+/* __bss_start: start of BSS sections */
+extern char __bss_start[];
+
+/* _end: end of kernel image */
+extern char _end[];
+
+#endif /* __PLAT_CMN_SECTIONS_H__ */
--
2.17.1

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