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, 162 insertions, 0 deletions

diff --git a/lib/libelf/gelf_rel.c b/lib/libelf/gelf_rel.c
new file mode 100644
index 00000000000..9f56e5c148a
--- /dev/null
+++ b/lib/libelf/gelf_rel.c
@@ -0,0 +1,162 @@
+/*-
+ * Copyright (c) 2006,2008 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 <gelf.h>
+#include <limits.h>
+#include <stdint.h>
+
+#include "_libelf.h"
+
+ELFTC_VCSID("$Id: gelf_rel.c,v 1.1 2019/02/01 05:27:38 jsg Exp $");
+
+GElf_Rel *
+gelf_getrel(Elf_Data *ed, int ndx, GElf_Rel *dst)
+{
+	int ec;
+	Elf *e;
+	size_t msz;
+	Elf_Scn *scn;
+	uint32_t sh_type;
+	Elf32_Rel *rel32;
+	Elf64_Rel *rel64;
+	struct _Libelf_Data *d;
+
+	d = (struct _Libelf_Data *) ed;
+
+	if (d == NULL || ndx < 0 || dst == NULL ||
+	    (scn = d->d_scn) == NULL ||
+	    (e = scn->s_elf) == NULL) {
+		LIBELF_SET_ERROR(ARGUMENT, 0);
+		return (NULL);
+	}
+
+	ec = e->e_class;
+	assert(ec == ELFCLASS32 || ec == ELFCLASS64);
+
+	if (ec == ELFCLASS32)
+		sh_type = scn->s_shdr.s_shdr32.sh_type;
+	else
+		sh_type = scn->s_shdr.s_shdr64.sh_type;
+
+	if (_libelf_xlate_shtype(sh_type) != ELF_T_REL) {
+		LIBELF_SET_ERROR(ARGUMENT, 0);
+		return (NULL);
+	}
+
+	msz = _libelf_msize(ELF_T_REL, ec, e->e_version);
+
+	assert(msz > 0);
+	assert(ndx >= 0);
+
+	if (msz * (size_t) ndx >= d->d_data.d_size) {
+		LIBELF_SET_ERROR(ARGUMENT, 0);
+		return (NULL);
+	}
+
+	if (ec == ELFCLASS32) {
+		rel32 = (Elf32_Rel *) d->d_data.d_buf + ndx;
+
+		dst->r_offset = (Elf64_Addr) rel32->r_offset;
+		dst->r_info   = ELF64_R_INFO(
+		    (Elf64_Xword) ELF32_R_SYM(rel32->r_info),
+		    ELF32_R_TYPE(rel32->r_info));
+
+	} else {
+
+		rel64 = (Elf64_Rel *) d->d_data.d_buf + ndx;
+
+		*dst = *rel64;
+	}
+
+	return (dst);
+}
+
+int
+gelf_update_rel(Elf_Data *ed, int ndx, GElf_Rel *dr)
+{
+	int ec;
+	Elf *e;
+	size_t msz;
+	Elf_Scn *scn;
+	uint32_t sh_type;
+	Elf32_Rel *rel32;
+	Elf64_Rel *rel64;
+	struct _Libelf_Data *d;
+
+	d = (struct _Libelf_Data *) ed;
+
+	if (d == NULL || ndx < 0 || dr == NULL ||
+	    (scn = d->d_scn) == NULL ||
+	    (e = scn->s_elf) == NULL) {
+		LIBELF_SET_ERROR(ARGUMENT, 0);
+		return (0);
+	}
+
+	ec = e->e_class;
+	assert(ec == ELFCLASS32 || ec == ELFCLASS64);
+
+	if (ec == ELFCLASS32)
+		sh_type = scn->s_shdr.s_shdr32.sh_type;
+	else
+		sh_type = scn->s_shdr.s_shdr64.sh_type;
+
+	if (_libelf_xlate_shtype(sh_type) != ELF_T_REL) {
+		LIBELF_SET_ERROR(ARGUMENT, 0);
+		return (0);
+	}
+
+	msz = _libelf_msize(ELF_T_REL, ec, e->e_version);
+
+	assert(msz > 0);
+	assert(ndx >= 0);
+
+	if (msz * (size_t) ndx >= d->d_data.d_size) {
+		LIBELF_SET_ERROR(ARGUMENT, 0);
+		return (0);
+	}
+
+	if (ec == ELFCLASS32) {
+		rel32 = (Elf32_Rel *) d->d_data.d_buf + ndx;
+
+		LIBELF_COPY_U32(rel32, dr, r_offset);
+
+		if (ELF64_R_SYM(dr->r_info) > ELF32_R_SYM(~0UL) ||
+		    ELF64_R_TYPE(dr->r_info) > ELF32_R_TYPE(~0U)) {
+			LIBELF_SET_ERROR(RANGE, 0);
+			return (0);
+		}
+		rel32->r_info = ELF32_R_INFO(
+			(Elf32_Word) ELF64_R_SYM(dr->r_info),
+			(Elf32_Word) ELF64_R_TYPE(dr->r_info));
+	} else {
+		rel64 = (Elf64_Rel *) d->d_data.d_buf + ndx;
+
+		*rel64 = *dr;
+	}
+
+	return (1);
+}