Index: src/platform.h
==================================================================
--- src/platform.h
+++ src/platform.h
@@ -53,10 +53,12 @@
 # define OF_MIPS
 # define OF_MIPS_O32
 #elif defined(__mips_eabi) && _MIPS_SZPTR == 32
 # define OF_MIPS
 # define OF_MIPS_EABI
+#elif defined(__sparc64__) || (defined(__sparc__) && defined(__arch64__))
+# define OF_SPARC64
 #elif defined(__sparc__) && !defined(__arch64__)
 # define OF_SPARC
 #endif
 
 #if defined(__APPLE__)

Index: src/runtime/lookup-asm/lookup-asm-sparc-elf.S
==================================================================
--- src/runtime/lookup-asm/lookup-asm-sparc-elf.S
+++ src/runtime/lookup-asm/lookup-asm-sparc-elf.S
@@ -80,11 +80,11 @@
 generate_lookup objc_msg_lookup_stret objc_method_not_found_stret
 generate_lookup_super objc_msg_lookup_super objc_msg_lookup
 generate_lookup_super objc_msg_lookup_super_stret objc_msg_lookup_stret
 
 ret_nil:
-#ifdef PIC
+#ifdef OF_PIC
 	mov	%o7, %g1
 
 	sethi	%hi(_GLOBAL_OFFSET_TABLE_ - 4), %o1
 	call	0f
 	 add	%o1, %lo(_GLOBAL_OFFSET_TABLE_ + 4), %o1

ADDED   src/runtime/lookup-asm/lookup-asm-sparc64-elf.S
Index: src/runtime/lookup-asm/lookup-asm-sparc64-elf.S
==================================================================
--- src/runtime/lookup-asm/lookup-asm-sparc64-elf.S
+++ src/runtime/lookup-asm/lookup-asm-sparc64-elf.S
@@ -0,0 +1,111 @@
+/*
+ * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015
+ *   Jonathan Schleifer <js@webkeks.org>
+ *
+ * All rights reserved.
+ *
+ * This file is part of ObjFW. It may be distributed under the terms of the
+ * Q Public License 1.0, which can be found in the file LICENSE.QPL included in
+ * the packaging of this file.
+ *
+ * Alternatively, it may be distributed under the terms of the GNU General
+ * Public License, either version 2 or 3, which can be found in the file
+ * LICENSE.GPLv2 or LICENSE.GPLv3 respectively included in the packaging of this
+ * file.
+ */
+
+#include "config.h"
+
+#include "platform.h"
+
+.globl objc_msg_lookup
+.globl objc_msg_lookup_stret
+.globl objc_msg_lookup_super
+.globl objc_msg_lookup_super_stret
+
+.section .text
+.macro generate_lookup name not_found
+\name:
+	cmp	%o0, 0
+	beq,a	ret_nil
+	 nop
+
+	ldx	[%o0], %o2
+	ldx	[%o2 + 64], %o2
+
+.Lmain_\name:
+#ifdef OF_SELUID24
+	ldub	[%o1 + 5], %o3
+#endif
+	ldub	[%o1 + 6], %o4
+	ldub	[%o1 + 7], %o5
+
+#ifdef OF_SELUID24
+	sll	%o3, 3, %o3
+#endif
+	sll	%o4, 3, %o4
+	sll	%o5, 3, %o5
+
+#ifdef OF_SELUID24
+	ldx	[%o2 + %o3], %o2
+#endif
+	ldx	[%o2 + %o4], %o2
+	ldx	[%o2 + %o5], %o2
+
+	cmp	%o2, 0
+	beq,a	\not_found
+	 nop
+
+	retl
+	 mov	%o2, %o0
+.type \name, %function
+.size \name, .-\name
+.endm
+
+.macro generate_lookup_super name lookup
+\name:
+	ldx	[%o0], %o2
+	cmp	%o2, 0
+	beq,a	ret_nil
+	 nop
+
+	ldx	[%o0 + 8], %o2
+	ba	.Lmain_\lookup
+	 ldx	[%o2 + 64], %o2
+.type \name, %function
+.size \name, .-\name
+.endm
+
+generate_lookup objc_msg_lookup objc_method_not_found
+generate_lookup objc_msg_lookup_stret objc_method_not_found_stret
+generate_lookup_super objc_msg_lookup_super objc_msg_lookup
+generate_lookup_super objc_msg_lookup_super_stret objc_msg_lookup_stret
+
+ret_nil:
+#ifdef OF_PIC
+	mov	%o7, %g1
+
+	sethi	%hi(_GLOBAL_OFFSET_TABLE_ - 4), %o1
+	call	0f
+	 add	%o1, %lo(_GLOBAL_OFFSET_TABLE_ + 4), %o1
+0:
+	add	%o7, %o1, %o1
+
+	sethi	%hi(nil_method), %o0
+	or	%o0, %lo(nil_method), %o0
+
+	jmpl	%g1 + 8, %g0
+	 ldx	[%o1 + %o0], %o0
+#else
+	sethi	%hi(nil_method), %o0
+	retl
+	 or	%o0, %lo(nil_method), %o0
+#endif
+
+nil_method:
+	retl
+	 clr	%o0
+
+#ifdef OF_LINUX
+.section .note.GNU-stack, "", %progbits
+#endif

Index: src/runtime/lookup-asm/lookup-asm.S
==================================================================
--- src/runtime/lookup-asm/lookup-asm.S
+++ src/runtime/lookup-asm/lookup-asm.S
@@ -27,10 +27,12 @@
 #  include "lookup-asm-arm-elf.S"
 # elif defined(OF_POWERPC)
 #  include "lookup-asm-ppc-elf.S"
 # elif defined(OF_MIPS)
 #  include "lookup-asm-mips-elf.S"
+# elif defined(OF_SPARC64)
+#  include "lookup-asm-sparc64-elf.S"
 # elif defined(OF_SPARC)
 #  include "lookup-asm-sparc-elf.S"
 # endif
 #elif defined(OF_MACH_O)
 # if defined(OF_X86_64)

Index: src/runtime/runtime-private.h
==================================================================
--- src/runtime/runtime-private.h
+++ src/runtime/runtime-private.h
@@ -184,11 +184,12 @@
 #endif
 }
 
 #if defined(OF_ELF)
 # if defined(OF_X86_64) || defined(OF_X86) || defined(OF_POWERPC) || \
-	defined(OF_ARM) || defined(OF_MIPS) || defined(OF_SPARC)
+	defined(OF_ARM) || defined(OF_MIPS) || defined(OF_SPARC64) || \
+	defined(OF_SPARC)
 #  define OF_ASM_LOOKUP
 # endif
 #elif defined(OF_MACH_O)
 # if defined(OF_X86_64) || defined(OF_POWERPC)
 #  define OF_ASM_LOOKUP