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

Bump __FreeBSD_version.

Reviewed by:	jb

1 files changed, 123 insertions, 0 deletions

diff --git a/lib/libelf/elf_shnum.c b/lib/libelf/elf_shnum.c
new file mode 100644
index 0000000..8a53eed
--- /dev/null
+++ b/lib/libelf/elf_shnum.c
@@ -0,0 +1,123 @@
+/*-
+ * 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 <ar.h>
+#include <libelf.h>
+
+#include "_libelf.h"
+
+int
+_libelf_getshnum(Elf *e, void *eh, int ec, size_t *shnum)
+{
+	Elf64_Off off;
+	Elf_Scn *scn;
+	void *sh;
+	size_t n;
+
+	if (ec == ELFCLASS32) {
+		n = ((Elf32_Ehdr *) eh)->e_shnum;
+		off = (Elf64_Off) ((Elf32_Ehdr *) eh)->e_shoff;
+	} else {
+		n = ((Elf64_Ehdr *) eh)->e_shnum;
+		off = ((Elf64_Ehdr *) eh)->e_shoff;
+	}
+
+	if (n != 0) {
+		*shnum = n;
+		return (1);
+	}
+
+	if (off == 0L) {
+		*shnum = (size_t) 0;
+		return (1);
+	}
+
+	/*
+	 * If 'e_shnum' is zero and 'e_shoff' is non-zero, the file is
+	 * using extended section numbering, and the true section
+	 * number is kept in the 'sh_size' field of the section header
+	 * at offset SHN_UNDEF.
+	 */
+	if ((scn = elf_getscn(e, (size_t) SHN_UNDEF)) == NULL)
+		return (0);
+	if ((sh = _libelf_getshdr(scn, ec)) == NULL)
+		return (0);
+
+	if (ec == ELFCLASS32)
+		*shnum = ((Elf32_Shdr *) sh)->sh_size;
+	else
+		*shnum = ((Elf64_Shdr *) sh)->sh_size;
+
+	return (1);
+}
+
+int
+_libelf_setshnum(Elf *e, void *eh, int ec, size_t shnum)
+{
+	Elf_Scn *scn;
+	void *sh;
+
+	if (shnum < SHN_LORESERVE) {
+		if (ec == ELFCLASS32)
+			((Elf32_Ehdr *) eh)->e_shnum = shnum;
+		else
+			((Elf64_Ehdr *) eh)->e_shnum = shnum;
+		return (1);
+	}
+
+	if ((scn = elf_getscn(e, (size_t) SHN_UNDEF)) == NULL)
+		return (0);
+	if ((sh = _libelf_getshdr(scn, ec)) == NULL)
+		return (0);
+
+	if (ec == ELFCLASS32)
+		((Elf32_Shdr *) sh)->sh_size = shnum;
+	else
+		((Elf64_Shdr *) sh)->sh_size = shnum;
+
+	(void) elf_flagshdr(scn, ELF_C_SET, ELF_F_DIRTY);
+
+	return (1);
+}
+
+int
+elf_getshnum(Elf *e, size_t *shnum)
+{
+	void *eh;
+	int ec;
+
+	if (e == NULL || e->e_kind != ELF_K_ELF ||
+	    ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64) ||
+	    ((eh = _libelf_ehdr(e, ec, 0)) == NULL)) {
+		LIBELF_SET_ERROR(ARGUMENT, 0);
+		return (0);
+	}
+
+	return (_libelf_getshnum(e, eh, ec, shnum));
+}