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

Bump __FreeBSD_version.

Reviewed by:	jb

1 files changed, 125 insertions, 0 deletions

diff --git a/lib/libelf/libelf_ehdr.c b/lib/libelf/libelf_ehdr.c
new file mode 100644
index 0000000..6c938b3
--- /dev/null
+++ b/lib/libelf/libelf_ehdr.c
@@ -0,0 +1,125 @@
+/*-
+ * 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.
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <assert.h>
+#include <gelf.h>
+#include <libelf.h>
+#include <stdlib.h>
+
+#include "_libelf.h"
+
+#define	EHDR_INIT(E,SZ)	 do {						\
+		Elf##SZ##_Ehdr *eh = (E);				\
+		eh->e_ident[EI_MAG0] = ELFMAG0;				\
+		eh->e_ident[EI_MAG1] = ELFMAG1;				\
+		eh->e_ident[EI_MAG2] = ELFMAG2;				\
+		eh->e_ident[EI_MAG3] = ELFMAG3;				\
+		eh->e_ident[EI_CLASS] = ELFCLASS##SZ;			\
+		eh->e_ident[EI_DATA]  = ELFDATANONE;			\
+		eh->e_ident[EI_VERSION] = LIBELF_PRIVATE(version);	\
+		eh->e_machine = EM_NONE;				\
+		eh->e_type    = ELF_K_NONE;				\
+		eh->e_version = LIBELF_PRIVATE(version);		\
+	} while (0)
+
+void *
+_libelf_ehdr(Elf *e, int ec, int allocate)
+{
+	size_t fsz, msz;
+	void *ehdr;
+	void (*xlator)(char *_d, char *_s, size_t _c, int _swap);
+
+	assert(ec == ELFCLASS32 || ec == ELFCLASS64);
+
+	if (e == NULL || e->e_kind != ELF_K_ELF) {
+		LIBELF_SET_ERROR(ARGUMENT, 0);
+		return (NULL);
+	}
+
+	if (e->e_class != ELFCLASSNONE && e->e_class != ec) {
+		LIBELF_SET_ERROR(CLASS, 0);
+		return (NULL);
+	}
+
+	if (e->e_version != EV_CURRENT) {
+		LIBELF_SET_ERROR(VERSION, 0);
+		return (NULL);
+	}
+
+	if (e->e_class == ELFCLASSNONE)
+		e->e_class = ec;
+
+	if (ec == ELFCLASS32)
+		ehdr = (void *) e->e_u.e_elf.e_ehdr.e_ehdr32;
+	else
+		ehdr = (void *) e->e_u.e_elf.e_ehdr.e_ehdr64;
+
+	if (ehdr != NULL)	/* already have a translated ehdr */
+		return (ehdr);
+
+	fsz = gelf_fsize(e, ELF_T_EHDR, (size_t) 1, e->e_version);
+
+	assert(fsz > 0);
+
+	if (e->e_cmd != ELF_C_WRITE && e->e_rawsize < fsz) {
+		LIBELF_SET_ERROR(HEADER, 0);
+		return (NULL);
+	}
+
+	msz = _libelf_msize(ELF_T_EHDR, ec, EV_CURRENT);
+
+	assert(msz > 0);
+
+	if ((ehdr = calloc((size_t) 1, msz)) == NULL) {
+		LIBELF_SET_ERROR(RESOURCE, 0);
+		return (NULL);
+	}
+
+	if (ec == ELFCLASS32) {
+		e->e_u.e_elf.e_ehdr.e_ehdr32 = ehdr;
+		EHDR_INIT(ehdr,32);
+	} else {
+		e->e_u.e_elf.e_ehdr.e_ehdr64 = ehdr;
+		EHDR_INIT(ehdr,64);
+	}
+
+	if (allocate)
+		e->e_flags |= ELF_F_DIRTY;
+
+	if (e->e_cmd == ELF_C_WRITE)
+		return (ehdr);
+
+	xlator = _libelf_get_translator(ELF_T_EHDR, ELF_TOMEMORY, ec);
+	(*xlator)(ehdr, e->e_rawfile, (size_t) 1,
+	    e->e_byteorder != LIBELF_PRIVATE(byteorder));
+
+	return (ehdr);
+}