add libelf from elftoolchain r3669

A 2 clause BSD licensed implementation of the SVR4 ELF API also
implemented by mr511.de libelf (devel/libelf in ports) and elfutils.

It is being added to base to allow Mesa to use it in future.

shlib major is higher than devel/libelf and pkg-config version is 0.8.2
to pass a glib2 configure test so this can replace the use of
devel/libelf in ports.

1 files changed, 63 insertions, 0 deletions

diff --git a/lib/libelf/libelf_elfmachine.c b/lib/libelf/libelf_elfmachine.c
new file mode 100644
index 00000000000..ec36e5510d6
--- /dev/null
+++ b/lib/libelf/libelf_elfmachine.c
@@ -0,0 +1,63 @@
+/*-
+ * Copyright (c) 2018 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 <assert.h>
+#include <libelf.h>
+
+#include "_libelf.h"
+
+ELFTC_VCSID("$Id: libelf_elfmachine.c,v 1.1 2019/02/01 05:27:38 jsg Exp $");
+
+/*
+ * A convenience helper that returns the ELF machine architecture for
+ * a ELF descriptor.
+ */
+int
+_libelf_elfmachine(Elf *e)
+{
+	Elf32_Ehdr *eh32;
+	Elf64_Ehdr *eh64;
+
+	if (!e)
+		return EM_NONE;
+
+	assert(e->e_kind == ELF_K_ELF);
+	assert(e->e_class != ELFCLASSNONE);
+
+	eh32 = NULL;
+	eh64 = NULL;
+
+	switch (e->e_class) {
+	case ELFCLASS32:
+		eh32 = e->e_u.e_elf.e_ehdr.e_ehdr32;
+		return eh32 ? eh32->e_machine : EM_NONE;
+	case ELFCLASS64:
+		eh64 = e->e_u.e_elf.e_ehdr.e_ehdr64;
+		return eh64 ? eh64->e_machine : EM_NONE;
+	}
+
+	return (EM_NONE);
+}