ext: Update libelf from elftoolchain 0.7.1

Change-Id: I8f86cd918ad01897c42aa479f9c64520def36830
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/50927
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Reviewed-by: Austin Harris <mail@austin-harris.com>
Reviewed-by: Hoa Nguyen <hoanguyen@ucdavis.edu>
Reviewed-by: Bobby R. Bruce <bbruce@ucdavis.edu>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>

ext/libelf/elf_open.c

@@ -0,0 +1,67 @@
+/*-
+ * Copyright (c) 2011 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 <libelf.h>
+
+#include "_libelf.h"
+
+ELFTC_VCSID("$Id$");
+
+/*
+ * Extension API: open a file for reading, ignoring parse errors.
+ */
+
+Elf *
+elf_open(int fd)
+{
+	if (LIBELF_PRIVATE(version) == EV_NONE) {
+		LIBELF_SET_ERROR(SEQUENCE, 0);
+		return (NULL);
+	}
+
+	return (_libelf_open_object(fd, ELF_C_READ, 0));
+}
+
+/*
+ * Extension API: create an ELF descriptor for an in-memory object,
+ * ignoring parse errors.
+ */
+
+Elf *
+elf_openmemory(char *image, size_t sz)
+{
+	if (LIBELF_PRIVATE(version) == EV_NONE) {
+		LIBELF_SET_ERROR(SEQUENCE, 0);
+		return (NULL);
+	}
+
+	if (image == NULL || sz == 0) {
+		LIBELF_SET_ERROR(ARGUMENT, 0);
+		return (NULL);
+	}
+
+	return (_libelf_memory((unsigned char *) image, sz, 0));
+}