Move the linker set definitions into a new header file

<sys/linker_set.h>.  <sys/kernel.h> includes the new header, so
functionally everything is still the same.

1 files changed, 89 insertions, 0 deletions

diff --git a/sys/sys/linker_set.h b/sys/sys/linker_set.h
new file mode 100644
index 0000000..9824a6b
--- /dev/null
+++ b/sys/sys/linker_set.h
@@ -0,0 +1,89 @@
+/*-
+ * Copyright (c) 1999 John D. Polstra
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
+ *
+ *	$Id$
+ */
+
+#ifndef _SYS_LINKER_SET_H_
+#define _SYS_LINKER_SET_H_
+
+/*
+ * The following macros are used to declare global sets of objects, which
+ * are collected by the linker into a `struct linker_set' as defined below.
+ * For ELF, this is done by constructing a separate segment for each set.
+ * For a.out, it is done automatically by the linker.
+ */
+#ifdef __ELF__
+
+/*
+ * Alpha GAS needs an align before the section change.  It seems to assume
+ * that after the .previous, it is aligned, so the following .align 3 is
+ * ignored.  Since the previous instructions often contain strings, this is
+ * a problem.
+ */
+
+#ifdef __alpha__
+#define MAKE_SET(set, sym)						\
+	static void const * const __set_##set##_sym_##sym = &sym;	\
+	__asm(".align 3");						\
+	__asm(".section .set." #set ",\"aw\"");				\
+	__asm(".quad " #sym);						\
+	__asm(".previous")
+#else
+#define MAKE_SET(set, sym)						\
+	static void const * const __set_##set##_sym_##sym = &sym;	\
+	__asm(".section .set." #set ",\"aw\"");				\
+	__asm(".long " #sym);						\
+	__asm(".previous")
+#endif
+#define TEXT_SET(set, sym) MAKE_SET(set, sym)
+#define DATA_SET(set, sym) MAKE_SET(set, sym)
+#define BSS_SET(set, sym)  MAKE_SET(set, sym)
+#define ABS_SET(set, sym)  MAKE_SET(set, sym)
+
+#else
+
+/*
+ * NB: the constants defined below must match those defined in
+ * ld/ld.h.  Since their calculation requires arithmetic, we
+ * can't name them symbolically (e.g., 23 is N_SETT | N_EXT).
+ */
+#define MAKE_SET(set, sym, type) \
+	static void const * const __set_##set##_sym_##sym = &sym; \
+	__asm(".stabs \"_" #set "\", " #type ", 0, 0, _" #sym)
+#define TEXT_SET(set, sym) MAKE_SET(set, sym, 23)
+#define DATA_SET(set, sym) MAKE_SET(set, sym, 25)
+#define BSS_SET(set, sym)  MAKE_SET(set, sym, 27)
+#define ABS_SET(set, sym)  MAKE_SET(set, sym, 21)
+
+#endif
+
+struct linker_set {
+	int		ls_length;
+	const void	*ls_items[1];		/* really ls_length of them,
+						 * trailing NULL */
+};
+
+#endif /* _SYS_LINKER_SET_H_ */