Subject: m68k support
From: Kurt Roeckx <[email-masked]>

Written by Kurt Roeckx, except for the retval support which was written
by Thorsten Glaser

Index: elfutils-0.164/backends/m68k_init.c
===================================================================
--- /dev/null
+++ elfutils-0.164/backends/m68k_init.c
@@ -0,0 +1,49 @@
+/* Initialization of m68k specific backend library.
+   Copyright (C) 2007 Kurt Roeckx <[email-masked]>
+
+   This software is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by the
+   Free Software Foundation; version 2 of the License.
+
+   This softare is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License along
+   with this software; if not, write to the Free Software Foundation,
+   Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA.
+
+*/
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#define BACKEND		m68k_
+#define RELOC_PREFIX	R_68K_
+#include "libebl_CPU.h"
+
+/* This defines the common reloc hooks based on m68k_reloc.def.  */
+#include "common-reloc.c"
+
+
+const char *
+m68k_init (Elf *elf __attribute__ ((unused)),
+     GElf_Half machine __attribute__ ((unused)),
+     Ebl *eh,
+     size_t ehlen)
+{
+  /* Check whether the Elf_BH object has a sufficent size.  */
+  if (ehlen < sizeof (Ebl))
+    return NULL;
+
+  /* We handle it.  */
+  eh->name = "m68k";
+  m68k_init_reloc (eh);
+  HOOK (eh, reloc_simple_type);
+  HOOK (eh, return_value_location);
+  HOOK (eh, register_info);
+
+  return MODVERSION;
+}
Index: elfutils-0.164/backends/m68k_regs.c
===================================================================
--- /dev/null
+++ elfutils-0.164/backends/m68k_regs.c
@@ -0,0 +1,106 @@
+/* Register names and numbers for m68k DWARF.
+   Copyright (C) 2007 Kurt Roeckx <[email-masked]>
+
+   This software is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by the
+   Free Software Foundation; version 2 of the License.
+
+   This software is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License along
+   with this software; if not, write to the Free Software Foundation,
+   Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA.
+
+   */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <string.h>
+#include <dwarf.h>
+
+#define BACKEND m68k_
+#include "libebl_CPU.h"
+
+ssize_t
+m68k_register_info (Ebl *ebl __attribute__ ((unused)),
+		   int regno, char *name, size_t namelen,
+		   const char **prefix, const char **setname,
+		   int *bits, int *type)
+{
+	if (name == NULL)
+		return 25;
+
+	if (regno < 0 || regno > 24 || namelen < 5)
+		return -1;
+
+	*prefix = "%";
+	*bits = 32;
+	*type = (regno < 8 ? DW_ATE_signed
+		: regno < 16 ? DW_ATE_address : DW_ATE_float);
+
+	if (regno < 8)
+	{
+		*setname = "integer";
+	}
+	else if (regno < 16)
+	{
+		*setname = "address";
+	}
+	else if (regno < 24)
+	{
+		*setname = "FPU";
+	}
+	else
+	{
+		*setname = "address";
+		*type = DW_ATE_address;
+	}
+
+	switch (regno)
+	{
+	case 0 ... 7:
+		name[0] = 'd';
+		name[1] = regno + '0';
+		namelen = 2;
+		break;
+
+	case 8 ... 13:
+		name[0] = 'a';
+		name[1] = regno - 8 + '0';
+		namelen = 2;
+		break;
+
+	case 14:
+		name[0] = 'f';
+		name[1] = 'p';
+   		namelen = 2;
+		break;
+
+	case 15:
+		name[0] = 's';
+		name[1] = 'p';
+   		namelen = 2;
+		break;
+
+	case 16 ... 23:
+		name[0] = 'f';
+		name[1] = 'p';
+		name[2] = regno - 16 + '0';
+   		namelen = 3;
+		break;
+
+	case 24:
+		name[0] = 'p';
+		name[1] = 'c';
+		namelen = 2;
+	}
+
+	name[namelen++] = '\0';
+	return namelen;
+}
+
Index: elfutils-0.164/backends/m68k_reloc.def
===================================================================
--- /dev/null
+++ elfutils-0.164/backends/m68k_reloc.def
@@ -0,0 +1,45 @@
+/* List the relocation types for m68k.  -*- C -*-
+   Copyright (C) 2007 Kurt Roeckx <[email-masked]>
+
+   This software is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by the
+   Free Software Foundation; version 2 of the License.
+
+   This software is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License along
+   with this software; if not, write to the Free Software Foundation,
+   Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA.
+*/
+
+/* 	    NAME,		REL|EXEC|DYN	*/
+
+RELOC_TYPE (NONE,		0)
+RELOC_TYPE (32,			REL|EXEC|DYN)
+RELOC_TYPE (16,			REL)
+RELOC_TYPE (8,			REL)
+RELOC_TYPE (PC32,		REL|EXEC|DYN)
+RELOC_TYPE (PC16,		REL)
+RELOC_TYPE (PC8,		REL)
+RELOC_TYPE (GOT32,		REL)
+RELOC_TYPE (GOT16,		REL)
+RELOC_TYPE (GOT8,		REL)
+RELOC_TYPE (GOT32O,		REL)
+RELOC_TYPE (GOT16O,		REL)
+RELOC_TYPE (GOT8O,		REL)
+RELOC_TYPE (PLT32,		REL)
+RELOC_TYPE (PLT16,		REL)
+RELOC_TYPE (PLT8,		REL)
+RELOC_TYPE (PLT32O,		REL)
+RELOC_TYPE (PLT16O,		REL)
+RELOC_TYPE (PLT8O,		REL)
+RELOC_TYPE (COPY,		EXEC)
+RELOC_TYPE (GLOB_DAT,		EXEC|DYN)
+RELOC_TYPE (JMP_SLOT,		EXEC|DYN)
+RELOC_TYPE (RELATIVE,		EXEC|DYN)
+RELOC_TYPE (GNU_VTINHERIT,	REL)
+RELOC_TYPE (GNU_VTENTRY,	REL)
+
Index: elfutils-0.164/libelf/elf.h
===================================================================
--- elfutils-0.164.orig/libelf/elf.h
+++ elfutils-0.164/libelf/elf.h
@@ -1158,6 +1158,9 @@ typedef struct
 #define R_68K_GLOB_DAT	20		/* Create GOT entry */
 #define R_68K_JMP_SLOT	21		/* Create PLT entry */
 #define R_68K_RELATIVE	22		/* Adjust by program base */
+/* The next 2 are GNU extensions to enable C++ vtable garbage collection.  */
+#define R_68K_GNU_VTINHERIT 23
+#define R_68K_GNU_VTENTRY   24
 #define R_68K_TLS_GD32      25          /* 32 bit GOT offset for GD */
 #define R_68K_TLS_GD16      26          /* 16 bit GOT offset for GD */
 #define R_68K_TLS_GD8       27          /* 8 bit GOT offset for GD */
Index: elfutils-0.164/backends/Makefile.am
===================================================================
--- elfutils-0.164.orig/backends/Makefile.am
+++ elfutils-0.164/backends/Makefile.am
@@ -33,12 +33,12 @@ AM_CPPFLAGS += -I$(top_srcdir)/libebl -I

 modules = i386 sh x86_64 ia64 alpha arm aarch64 sparc ppc ppc64 s390 \
-	  tilegx parisc mips
+	  tilegx parisc mips m68k
 libebl_pic = libebl_i386_pic.a libebl_sh_pic.a libebl_x86_64_pic.a    \
 	     libebl_ia64_pic.a libebl_alpha_pic.a libebl_arm_pic.a    \
 	     libebl_aarch64_pic.a libebl_sparc_pic.a libebl_ppc_pic.a \
 	     libebl_ppc64_pic.a libebl_s390_pic.a libebl_tilegx_pic.a \
-	     libebl_parisc_pic.a libebl_mips_pic.a
+	     libebl_parisc_pic.a libebl_mips_pic.a libebl_m68k_pic.a
 noinst_LIBRARIES = $(libebl_pic)
 noinst_DATA = $(libebl_pic:_pic.a=.so)
 
@@ -120,6 +120,10 @@ mips_SRCS = mips_init.c mips_symbol.c mi
 libebl_mips_pic_a_SOURCES = $(mips_SRCS)
 am_libebl_mips_pic_a_OBJECTS = $(mips_SRCS:.c=.os)
 
+m68k_SRCS = m68k_init.c m68k_symbol.c m68k_regs.c m68k_retval.c
+libebl_m68k_pic_a_SOURCES = $(m68k_SRCS)
+am_libebl_m68k_pic_a_OBJECTS = $(m68k_SRCS:.c=.os)
+
 libebl_%.so libebl_%.map: libebl_%_pic.a $(libelf) $(libdw)
 	@rm -f $(@:.so=.map)
 	$(AM_V_at)echo 'ELFUTILS_$(PACKAGE_VERSION) { global: $*_init; local: *; };' \
Index: elfutils-0.164/backends/m68k_symbol.c
===================================================================
--- /dev/null
+++ elfutils-0.164/backends/m68k_symbol.c
@@ -0,0 +1,43 @@
+/* m68k specific symbolic name handling.
+   Copyright (C) 2007 Kurt Roeckx <[email-masked]>
+
+   This software is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by the
+   Free Software Foundation; version 2 of the License.
+
+   This software distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License along
+   with this software; if not, write to the Free Software Foundation,
+   Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA.
+*/
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <elf.h>
+#include <stddef.h>
+
+#define BACKEND		m68k_
+#include "libebl_CPU.h"
+
+/* Check for the simple reloc types.  */
+Elf_Type
+m68k_reloc_simple_type (Ebl *ebl __attribute__ ((unused)), int type)
+{
+  switch (type)
+    {
+    case R_68K_32:
+      return ELF_T_SWORD;
+    case R_68K_16:
+      return ELF_T_HALF;
+    case R_68K_8:
+      return ELF_T_BYTE;
+    default:
+      return ELF_T_NUM;
+    }
+}
Index: elfutils-0.164/backends/m68k_retval.c
===================================================================
--- /dev/null
+++ elfutils-0.164/backends/m68k_retval.c
@@ -0,0 +1,172 @@
+/* Function return value location for Linux/m68k ABI.
+   Copyright (C) 2005-2010 Red Hat, Inc.
+   Copyright (c) 2011 Thorsten Glaser, Debian.
+   This file is part of Red Hat elfutils.
+
+   Red Hat elfutils is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by the
+   Free Software Foundation; version 2 of the License.
+
+   Red Hat elfutils is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License along
+   with Red Hat elfutils; if not, write to the Free Software Foundation,
+   Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA.
+
+   Red Hat elfutils is an included package of the Open Invention Network.
+   An included package of the Open Invention Network is a package for which
+   Open Invention Network licensees cross-license their patents.  No patent
+   license is granted, either expressly or impliedly, by designation as an
+   included package.  Should you wish to participate in the Open Invention
+   Network licensing program, please visit www.openinventionnetwork.com
+   <http://www.openinventionnetwork.com>.  */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <assert.h>
+#include <dwarf.h>
+
+#define BACKEND m68k_
+#include "libebl_CPU.h"
+
+
+/* %d0, or pair %d0, %d1, or %a0 */
+static const Dwarf_Op loc_intreg[] =
+  {
+    { .atom = DW_OP_reg0 }, { .atom = DW_OP_piece, .number = 4 },
+    { .atom = DW_OP_reg1 }, { .atom = DW_OP_piece, .number = 4 },
+  };
+static const Dwarf_Op loc_ptrreg[] =
+  {
+    { .atom = DW_OP_reg8 },
+  };
+#define nloc_intreg	1
+#define nloc_intregpair	4
+#define nloc_ptrreg	1
+
+/* %f0 */
+static const Dwarf_Op loc_fpreg[] =
+  {
+    { .atom = DW_OP_reg16 }
+  };
+#define nloc_fpreg	1
+
+/* Structures are a bit more complicated - small structures are returned
+   in %d0 / %d1 (-freg-struct-return which is enabled by default), large
+   structures use %a1 (in constrast to the SYSV psABI which says %a0) as
+   reentrant storage space indicator.  */
+static const Dwarf_Op loc_aggregate[] =
+  {
+    { .atom = DW_OP_breg9, .number = 0 }
+  };
+#define nloc_aggregate 1
+
+int
+m68k_return_value_location (Dwarf_Die *functypedie, const Dwarf_Op **locp)
+{
+  Dwarf_Word size;
+
+  /* Start with the function's type, and get the DW_AT_type attribute,
+     which is the type of the return value.  */
+
+  Dwarf_Attribute attr_mem;
+  Dwarf_Attribute *attr = dwarf_attr_integrate (functypedie, DW_AT_type,
+						&attr_mem);
+  if (attr == NULL)
+    /* The function has no return value, like a `void' function in C.  */
+    return 0;
+
+  Dwarf_Die die_mem;
+  Dwarf_Die *typedie = dwarf_formref_die (attr, &die_mem);
+  int tag = dwarf_tag (typedie);
+
+  /* Follow typedefs and qualifiers to get to the actual type.  */
+  while (tag == DW_TAG_typedef
+	 || tag == DW_TAG_const_type || tag == DW_TAG_volatile_type
+	 || tag == DW_TAG_restrict_type)
+    {
+      attr = dwarf_attr_integrate (typedie, DW_AT_type, &attr_mem);
+      typedie = dwarf_formref_die (attr, &die_mem);
+      tag = dwarf_tag (typedie);
+    }
+
+  switch (tag)
+    {
+    case -1:
+      return -1;
+
+    case DW_TAG_subrange_type:
+      if (! dwarf_hasattr_integrate (typedie, DW_AT_byte_size))
+	{
+	  attr = dwarf_attr_integrate (typedie, DW_AT_type, &attr_mem);
+	  typedie = dwarf_formref_die (attr, &die_mem);
+	  tag = dwarf_tag (typedie);
+	}
+      /* Fall through.  */
+
+    case DW_TAG_base_type:
+    case DW_TAG_enumeration_type:
+    case DW_TAG_pointer_type:
+    case DW_TAG_ptr_to_member_type:
+      if (dwarf_formudata (dwarf_attr_integrate (typedie, DW_AT_byte_size,
+						 &attr_mem), &size) != 0)
+	{
+	  if (tag == DW_TAG_pointer_type || tag == DW_TAG_ptr_to_member_type)
+	    size = 4;
+	  else
+	    return -1;
+	}
+      if (tag == DW_TAG_pointer_type || tag == DW_TAG_ptr_to_member_type)
+	{
+	  *locp = loc_ptrreg;
+          return nloc_ptrreg;
+	}
+      if (tag == DW_TAG_base_type)
+	{
+	  Dwarf_Word encoding;
+	  if (dwarf_formudata (dwarf_attr_integrate (typedie, DW_AT_encoding,
+						     &attr_mem),
+			       &encoding) != 0)
+	    return -1;
+	  if (encoding == DW_ATE_float)
+	    {
+	      /* XXX really 10? */
+              if (size > 10)
+                return -2;
+              *locp = loc_fpreg;
+              return nloc_fpreg;
+	    }
+	}
+      if (size <= 8)
+	{
+	intreg:
+	  /* XXX check endianness of dword pair, int64 vs aggregate */
+	  *locp = loc_intreg;
+	  return size <= 4 ? nloc_intreg : nloc_intregpair;
+	}
+
+    aggregate:
+      *locp = loc_aggregate;
+      return nloc_aggregate;
+
+    case DW_TAG_structure_type:
+    case DW_TAG_class_type:
+    case DW_TAG_union_type:
+    case DW_TAG_array_type:
+      if (dwarf_aggregate_size (typedie, &size) == 0
+	  && size > 0 && size <= 8)
+	/* not accurate for a struct whose only member is a float */
+	goto intreg;
+      goto aggregate;
+    }
+
+  /* XXX We don't have a good way to return specific errors from ebl calls.
+     This value means we do not understand the type, but it is well-formed
+     DWARF and might be valid.  */
+  return -2;
+}