MFP4: Add an implementation of the ELF(3) and GELF(3) API set.

Bump __FreeBSD_version.

Reviewed by:	jb

1 files changed, 137 insertions, 0 deletions

diff --git a/lib/libelf/libelf_xlate.c b/lib/libelf/libelf_xlate.c
new file mode 100644
index 0000000..65a47b5
--- /dev/null
+++ b/lib/libelf/libelf_xlate.c
@@ -0,0 +1,137 @@
+/*-
+ * Copyright (c) 2006 Joseph Koshy
+ * 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <assert.h>
+#include <libelf.h>
+
+#include "_libelf.h"
+
+/*
+ * Translate to/from the file representation of ELF objects.
+ *
+ * Translation could potentially involve the following
+ * transformations:
+ *
+ * - an endianness conversion,
+ * - a change of layout, as the file representation of ELF objects
+ *   can differ from their in-memory representation.
+ * - a change in representation due to a layout version change.
+ */
+
+Elf_Data *
+_libelf_xlate(Elf_Data *dst, const Elf_Data *src, unsigned int encoding,
+    int elfclass, int direction)
+{
+	size_t cnt, dsz, fsz, msz;
+	uintptr_t sb, se, db, de;
+
+	if (encoding == ELFDATANONE)
+		encoding = LIBELF_PRIVATE(byteorder);
+
+	if ((encoding != ELFDATA2LSB && encoding != ELFDATA2MSB) ||
+	    dst == NULL || src == NULL || dst == src)	{
+		LIBELF_SET_ERROR(ARGUMENT, 0);
+		return (NULL);
+	}
+
+	assert(elfclass == ELFCLASS32 || elfclass == ELFCLASS64);
+	assert(direction == ELF_TOFILE || direction == ELF_TOMEMORY);
+
+	if (dst->d_version != src->d_version) {
+		LIBELF_SET_ERROR(UNIMPL, 0);
+		return (NULL);
+	}
+
+	if  (src->d_buf == NULL || dst->d_buf == NULL ||
+	    src->d_size == 0) {
+		LIBELF_SET_ERROR(DATA, 0);
+		return (NULL);
+	}
+
+	if ((int) src->d_type < 0 || src->d_type >= ELF_T_NUM) {
+		LIBELF_SET_ERROR(DATA, 0);
+		return (NULL);
+	}
+
+	if ((fsz = (elfclass == ELFCLASS32 ? elf32_fsize : elf64_fsize)(src->d_type,
+		 (size_t) 1, src->d_version)) == 0)
+		return (NULL);
+
+	msz = _libelf_msize(src->d_type, elfclass, src->d_version);
+
+	assert(msz > 0);
+
+	if (src->d_size % (direction == ELF_TOMEMORY ? fsz : msz)) {
+		LIBELF_SET_ERROR(DATA, 0);
+		return (NULL);
+	}
+
+	cnt = src->d_size / msz;
+	dsz = cnt * fsz;
+
+	if (dst->d_size  <  dsz) {
+		LIBELF_SET_ERROR(DATA, 0);
+		return (NULL);
+	}
+
+	sb = (uintptr_t) src->d_buf;
+	se = sb + src->d_size;
+	db = (uintptr_t) dst->d_buf;
+	de = db + dst->d_size;
+
+	/*
+	 * Check for overlapping buffers.  Note that db == sb is
+	 * allowed, in which case the source buffer must also be large
+	 * enough for `n' target objects.  For file to native
+	 * conversions, an in-place conversion is not always possible.
+	 */
+	if ((db == sb && dsz < src->d_size) ||
+	    (db != sb && de > sb && se > db)) {
+		LIBELF_SET_ERROR(DATA, 0);
+		return (NULL);
+	}
+
+	if ((direction == ELF_TOMEMORY ? db : sb) %
+	    _libelf_malign(src->d_type, elfclass)) {
+		LIBELF_SET_ERROR(DATA, 0);
+		return (NULL);
+	}
+
+	dst->d_type = src->d_type;
+	dst->d_size = cnt * fsz;
+
+	if (db == sb && encoding == LIBELF_PRIVATE(byteorder) &&
+	    fsz == msz)
+		return (dst);	/* nothing more to do */
+
+	(_libelf_get_translator(src->d_type, direction, elfclass))(dst->d_buf,
+	    src->d_buf, cnt, encoding != LIBELF_PRIVATE(byteorder));
+
+	return (dst);
+}