1 files changed, 116 insertions, 0 deletions
diff --git a/usr.sbin/kldxref/ef_amd64.c b/usr.sbin/kldxref/ef_amd64.c
new file mode 100644
index 0000000..b90882d
--- /dev/null
+++ b/usr.sbin/kldxref/ef_amd64.c
@@ -0,0 +1,116 @@
+/*-
+ * Copyright (c) 2003 Jake Burkholder.
+ * Copyright 1996-1998 John D. Polstra.
+ * 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/types.h>
+#include <machine/elf.h>
+
+#include <err.h>
+#include <errno.h>
+
+#include "ef.h"
+
+/*
+ * Apply relocations to the values we got from the file. `relbase' is the
+ * target relocation address of the section, and `dataoff' is the target
+ * relocation address of the data in `dest'.
+ */
+int
+ef_reloc(struct elf_file *ef, const void *reldata, int reltype, Elf_Off relbase,
+    Elf_Off dataoff, size_t len, void *dest)
+{
+	Elf64_Addr *where, val;
+	Elf32_Addr *where32, val32;
+	Elf_Addr addend, addr;
+	Elf_Size rtype, symidx;
+	const Elf_Rel *rel;
+	const Elf_Rela *rela;
+
+	switch (reltype) {
+	case EF_RELOC_REL:
+		rel = (const Elf_Rel *)reldata;
+		where = (Elf_Addr *)(dest + relbase + rel->r_offset - dataoff);
+		addend = 0;
+		rtype = ELF_R_TYPE(rel->r_info);
+		symidx = ELF_R_SYM(rel->r_info);
+		break;
+	case EF_RELOC_RELA:
+		rela = (const Elf_Rela *)reldata;
+		where = (Elf_Addr *)(dest + relbase + rela->r_offset - dataoff);
+		addend = rela->r_addend;
+		rtype = ELF_R_TYPE(rela->r_info);
+		symidx = ELF_R_SYM(rela->r_info);
+		break;
+	default:
+		return (EINVAL);
+	}
+
+	if ((char *)where < (char *)dest || (char *)where >= (char *)dest + len)
+		return (0);
+
+	if (reltype == EF_RELOC_REL) {
+		/* Addend is 32 bit on 32 bit relocs */
+		switch (rtype) {
+		case R_X86_64_PC32:
+		case R_X86_64_32S:
+			addend = *(Elf32_Addr *)where;
+			break;
+		default:
+			addend = *where;
+			break;
+		}
+	}
+
+	switch (rtype) {
+	case R_X86_64_NONE:	/* none */
+		break;
+	case R_X86_64_64:	/* S + A */
+		addr = EF_SYMADDR(ef, symidx);
+		val = addr + addend;
+		*where = val;
+		break;
+	case R_X86_64_32S:	/* S + A sign extend */
+		addr = EF_SYMADDR(ef, symidx);
+		val32 = (Elf32_Addr)(addr + addend);
+		where32 = (Elf32_Addr *)where;
+		*where32 = val32;
+		break;
+	case R_X86_64_GLOB_DAT:	/* S */
+		addr = EF_SYMADDR(ef, symidx);
+		*where = addr;
+		break;
+	case R_X86_64_RELATIVE:	/* B + A */
+		addr = (Elf_Addr)addend + relbase;
+		val = addr;
+		*where = val;
+		break;
+	default:
+		warnx("unhandled relocation type %d", (int)rtype);
+	}
+	return (0);
+}