Initial checkin for ld.so. This is a combination of effort from Manuel Novoa

III and me.  I've been working on stripping out arch dependant stuff and
replacing it with generic stuff whenever possible.
 -Erik

5 files changed, 648 insertions, 0 deletions

diff --git a/ldso/ldso/m68k/dl-sysdep.h b/ldso/ldso/m68k/dl-sysdep.h
new file mode 100644
index 000000000..24af47ca0
--- /dev/null
+++ b/ldso/ldso/m68k/dl-sysdep.h
@@ -0,0 +1,87 @@
+
+/* Various assmbly language/system dependent hacks that are required
+   so that we can minimize the amount of platform specific code. */
+
+/* Define this if the system uses RELOCA.  */
+#define ELF_USES_RELOCA
+
+/* Get a pointer to the argv array.  On many platforms this can be
+   just the address if the first argument, on other platforms we need
+   to do something a little more subtle here.  */
+#define GET_ARGV(ARGVP, ARGS) ((ARGVP) = ((unsigned int *) &(ARGS)))
+
+/* Get the address of the Global offset table.  This must be absolute,
+   not relative.  */
+#define GET_GOT(X)     __asm__ ("movel %%a5,%0" : "=g" (X))
+
+/* Initialization sequence for a GOT.  */
+#define INIT_GOT(GOT_BASE,MODULE)		\
+{						\
+  GOT_BASE[2] = (int) _dl_linux_resolve;	\
+  GOT_BASE[1] = (int) (MODULE);			\
+}
+
+/* Here is a macro to perform a relocation.  This is only used when
+   bootstrapping the dynamic loader.  RELP is the relocation that we
+   are performing, REL is the pointer to the address we are
+   relocating.  SYMBOL is the symbol involved in the relocation, and
+   LOAD is the load address. */
+#define PERFORM_BOOTSTRAP_RELOC(RELP,REL,SYMBOL,LOAD)		\
+  switch (ELF32_R_TYPE ((RELP)->r_info))			\
+    {								\
+    case R_68K_8:						\
+      *(char *) (REL) = (SYMBOL) + (RELP)->r_addend;		\
+      break;							\
+    case R_68K_16:						\
+      *(short *) (REL) = (SYMBOL) + (RELP)->r_addend;		\
+      break;							\
+    case R_68K_32:						\
+      *(REL) = (SYMBOL) + (RELP)->r_addend;			\
+      break;							\
+    case R_68K_PC8:						\
+      *(char *) (REL) = ((SYMBOL) + (RELP)->r_addend		\
+			 - (unsigned int) (REL));		\
+      break;							\
+    case R_68K_PC16:						\
+      *(short *) (REL) = ((SYMBOL) + (RELP)->r_addend		\
+			  - (unsigned int) (REL));		\
+      break;							\
+    case R_68K_PC32:						\
+      *(REL) = ((SYMBOL) + (RELP)->r_addend			\
+		- (unsigned int) (REL));			\
+      break;							\
+    case R_68K_GLOB_DAT:					\
+    case R_68K_JMP_SLOT:					\
+      *(REL) = (SYMBOL);					\
+      break;							\
+    case R_68K_RELATIVE:		/* Compatibility kludge */ \
+      *(REL) = ((unsigned int) (LOAD) + ((RELP)->r_addend ? : *(REL))); \
+      break;							\
+    default:							\
+      _dl_exit (1);						\
+    }
+
+
+/* Transfer control to the user's application, once the dynamic loader
+   is done.  */
+
+#define START()					\
+  __asm__ volatile ("unlk %%a6\n\t"		\
+		    "jmp %0@"			\
+		    : : "a" (_dl_elf_main));
+
+
+
+/* Here we define the magic numbers that this dynamic loader should accept */
+
+#define MAGIC1 EM_68K
+#undef MAGIC2
+/* Used for error messages */
+#define ELF_TARGET "m68k"
+
+struct elf_resolve;
+extern unsigned int _dl_linux_resolver (int, int, struct elf_resolve *, int);
+
+/* Define this because we do not want to call .udiv in the library.
+   Not needed for m68k.  */
+#define do_rem(result, n, base)  ((result) = (n) % (base))
diff --git a/ldso/ldso/m68k/elfinterp.c b/ldso/ldso/m68k/elfinterp.c
new file mode 100644
index 000000000..9b73efd3f
--- /dev/null
+++ b/ldso/ldso/m68k/elfinterp.c
@@ -0,0 +1,358 @@
+/* Run an ELF binary on a linux system.
+
+   Copyright (C) 1993, Eric Youngdale.
+   Copyright (C) 1995, Andreas Schwab.
+
+   This program 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; either version 2, or (at your option)
+   any later version.
+
+   This program 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 program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+/* Adapted to ELF/68k by Andreas Schwab.  */
+
+#ifndef VERBOSE_DLINKER
+#define VERBOSE_DLINKER
+#endif
+#ifdef VERBOSE_DLINKER
+static char *_dl_reltypes[] =
+{
+  "R_68K_NONE",
+  "R_68K_32", "R_68K_16", "R_68K_8",
+  "R_68K_PC32", "R_68K_PC16", "R_68K_PC8",
+  "R_68K_GOT32", "R_68K_GOT16", "R_68K_GOT8",
+  "R_68K_GOT32O", "R_68K_GOT16O", "R_68K_GOT8O",
+  "R_68K_PLT32", "R_68K_PLT16", "R_68K_PLT8",
+  "R_68K_PLT32O", "R_68K_PLT16O", "R_68K_PLT8O",
+  "R_68K_COPY", "R_68K_GLOB_DAT", "R_68K_JMP_SLOT", "R_68K_RELATIVE",
+  "R_68K_NUM"
+};
+#endif
+
+/* Program to load an ELF binary on a linux system, and run it.
+   References to symbols in sharable libraries can be resolved by either
+   an ELF sharable library or a linux style of shared library. */
+
+/* Disclaimer:  I have never seen any AT&T source code for SVr4, nor have
+   I ever taken any courses on internals.  This program was developed using
+   information available through the book "UNIX SYSTEM V RELEASE 4,
+   Programmers guide: Ansi C and Programming Support Tools", which did
+   a more than adequate job of explaining everything required to get this
+   working. */
+
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/unistd.h>
+/*#include <stdlib.h>*/
+#include "string.h"
+#include <linux/unistd.h>
+#include <linux/fcntl.h>
+#include <linux/elf.h>
+
+#include "hash.h"
+#include "linuxelf.h"
+#include "sysdep.h"
+#include "../syscall.h"
+#include "../string.h"
+
+extern char *_dl_progname;
+
+unsigned int 
+_dl_linux_resolver (int dummy1, int dummy2,
+		    struct elf_resolve *tpnt, int reloc_entry)
+{
+  int reloc_type;
+  struct elf32_rela *this_reloc;
+  char *strtab;
+  struct elf32_sym *symtab;
+  char *rel_addr;
+  int symtab_index;
+  char *new_addr;
+  char **got_addr;
+  unsigned int instr_addr;
+
+  rel_addr = tpnt->loadaddr + tpnt->dynamic_info[DT_JMPREL];
+  this_reloc = (struct elf32_rela *) (rel_addr + reloc_entry);
+  reloc_type = ELF32_R_TYPE (this_reloc->r_info);
+  symtab_index = ELF32_R_SYM (this_reloc->r_info);
+
+  symtab = (struct elf32_sym *) (tpnt->dynamic_info[DT_SYMTAB]
+				 + tpnt->loadaddr);
+  strtab = (char *) (tpnt->dynamic_info[DT_STRTAB] + tpnt->loadaddr);
+
+
+  if (reloc_type != R_68K_JMP_SLOT)
+    {
+      _dl_fdprintf (2, "%s: incorrect relocation type in jump relocations\n",
+		    _dl_progname);
+      _dl_exit (1);
+    }
+
+  /* Address of jump instruction to fix up.  */
+  instr_addr = (int) this_reloc->r_offset + (int) tpnt->loadaddr;
+  got_addr = (char **) instr_addr;
+
+#ifdef DEBUG
+  _dl_fdprintf (2, "Resolving symbol %s\n",
+		strtab + symtab[symtab_index].st_name);
+#endif
+
+  /* Get the address of the GOT entry.  */
+  new_addr = _dl_find_hash (strtab + symtab[symtab_index].st_name,
+			    tpnt->symbol_scope, (int) got_addr, tpnt, 0);
+  if (!new_addr)
+    {
+      _dl_fdprintf (2, "%s: can't resolve symbol '%s'\n",
+		    _dl_progname, strtab + symtab[symtab_index].st_name);
+      _dl_exit (1);
+    }
+/* #define DEBUG_LIBRARY */
+#ifdef DEBUG_LIBRARY
+  if ((unsigned int) got_addr < 0x40000000)
+    _dl_fdprintf (2, "Calling library function: %s\n",
+		  strtab + symtab[symtab_index].st_name);
+  else
+#endif
+    *got_addr = new_addr;
+  return (unsigned int) new_addr;
+}
+
+void
+_dl_parse_lazy_relocation_information (struct elf_resolve *tpnt, int rel_addr,
+				       int rel_size, int type)
+{
+  int i;
+  char *strtab;
+  int reloc_type;
+  int symtab_index;
+  struct elf32_sym *symtab;
+  struct elf32_rela *rpnt;
+  unsigned int *reloc_addr;
+
+  /* Now parse the relocation information.  */
+  rpnt = (struct elf32_rela *) (rel_addr + tpnt->loadaddr);
+  rel_size = rel_size / sizeof (struct elf32_rela);
+
+  symtab = (struct elf32_sym *) (tpnt->dynamic_info[DT_SYMTAB]
+				 + tpnt->loadaddr);
+  strtab = (char *) (tpnt->dynamic_info[DT_STRTAB] + tpnt->loadaddr);
+
+  for (i = 0; i < rel_size; i++, rpnt++)
+    {
+      reloc_addr = (int *) (tpnt->loadaddr + (int) rpnt->r_offset);
+      reloc_type = ELF32_R_TYPE (rpnt->r_info);
+      symtab_index = ELF32_R_SYM (rpnt->r_info);
+
+      /* When the dynamic linker bootstrapped itself, it resolved some symbols.
+         Make sure we do not do them again.  */
+      if (tpnt->libtype == program_interpreter
+	  && (!symtab_index
+	      || _dl_symbol (strtab + symtab[symtab_index].st_name)))
+	continue;
+
+      switch (reloc_type)
+	{
+	case R_68K_NONE:
+	  break;
+	case R_68K_JMP_SLOT:
+	  *reloc_addr += (unsigned int) tpnt->loadaddr;
+	  break;
+	default:
+	  _dl_fdprintf (2, "%s: (LAZY) can't handle reloc type ", _dl_progname);
+#ifdef VERBOSE_DLINKER
+	  _dl_fdprintf (2, "%s ", _dl_reltypes[reloc_type]);
+#endif
+	  if (symtab_index)
+	    _dl_fdprintf (2, "'%s'", strtab + symtab[symtab_index].st_name);
+	  _dl_fdprintf (2, "\n");
+	  _dl_exit (1);
+	}
+    }
+}
+
+int 
+_dl_parse_relocation_information (struct elf_resolve *tpnt, int rel_addr,
+				  int rel_size, int type)
+{
+  int i;
+  char *strtab;
+  int reloc_type;
+  int goof = 0;
+  struct elf32_sym *symtab;
+  struct elf32_rela *rpnt;
+  unsigned int *reloc_addr;
+  unsigned int symbol_addr;
+  int symtab_index;
+  /* Now parse the relocation information */
+
+  rpnt = (struct elf32_rela *) (rel_addr + tpnt->loadaddr);
+  rel_size = rel_size / sizeof (struct elf32_rela);
+
+  symtab = (struct elf32_sym *) (tpnt->dynamic_info[DT_SYMTAB]
+				 + tpnt->loadaddr);
+  strtab = (char *) (tpnt->dynamic_info[DT_STRTAB] + tpnt->loadaddr);
+
+  for (i = 0; i < rel_size; i++, rpnt++)
+    {
+      reloc_addr = (int *) (tpnt->loadaddr + (int) rpnt->r_offset);
+      reloc_type = ELF32_R_TYPE (rpnt->r_info);
+      symtab_index = ELF32_R_SYM (rpnt->r_info);
+      symbol_addr = 0;
+
+      if (tpnt->libtype == program_interpreter
+	  && (!symtab_index
+	      || _dl_symbol (strtab + symtab[symtab_index].st_name)))
+	continue;
+
+      if (symtab_index)
+	{
+	  symbol_addr = (unsigned int)
+	    _dl_find_hash (strtab + symtab[symtab_index].st_name,
+			   tpnt->symbol_scope, (int) reloc_addr,
+			   reloc_type == R_68K_JMP_SLOT ? tpnt : NULL, 0);
+
+	  /* We want to allow undefined references to weak symbols -
+	     this might have been intentional.  We should not be
+	     linking local symbols here, so all bases should be
+	     covered.  */
+	  if (!symbol_addr
+	      && ELF32_ST_BIND (symtab[symtab_index].st_info) == STB_GLOBAL)
+	    {
+	      _dl_fdprintf (2, "%s: can't resolve symbol '%s'\n",
+			    _dl_progname, strtab + symtab[symtab_index].st_name);
+	      goof++;
+	    }
+	}
+      switch (reloc_type)
+	{
+	case R_68K_NONE:
+	  break;
+	case R_68K_8:
+	  *(char *) reloc_addr = symbol_addr + rpnt->r_addend;
+	  break;
+	case R_68K_16:
+	  *(short *) reloc_addr = symbol_addr + rpnt->r_addend;
+	  break;
+	case R_68K_32:
+	  *reloc_addr = symbol_addr + rpnt->r_addend;
+	  break;
+	case R_68K_PC8:
+	  *(char *) reloc_addr = (symbol_addr + rpnt->r_addend
+				  - (unsigned int) reloc_addr);
+	  break;
+	case R_68K_PC16:
+	  *(short *) reloc_addr = (symbol_addr + rpnt->r_addend
+				   - (unsigned int) reloc_addr);
+	  break;
+	case R_68K_PC32:
+	  *reloc_addr = (symbol_addr + rpnt->r_addend
+			 - (unsigned int) reloc_addr);
+	  break;
+	case R_68K_GLOB_DAT:
+	case R_68K_JMP_SLOT:
+	  *reloc_addr = symbol_addr;
+	  break;
+	case R_68K_RELATIVE:
+	  *reloc_addr = ((unsigned int) tpnt->loadaddr
+			 /* Compatibility kludge.  */
+			 + (rpnt->r_addend ? : *reloc_addr));
+	  break;
+	case R_68K_COPY:
+#if 0 /* Do this later.  */
+	  _dl_fdprintf (2, "Doing copy");
+	  if (symtab_index)
+	    _dl_fdprintf (2, " for symbol %s",
+			  strtab + symtab[symtab_index].st_name);
+	  _dl_fdprintf (2, "\n");
+	  _dl_memcpy ((void *) symtab[symtab_index].st_value,
+		      (void *) symbol_addr,
+		      symtab[symtab_index].st_size);
+#endif
+	  break;
+	default:
+	  _dl_fdprintf (2, "%s: can't handle reloc type ", _dl_progname);
+#ifdef VERBOSE_DLINKER
+	  _dl_fdprintf (2, "%s ", _dl_reltypes[reloc_type]);
+#endif
+	  if (symtab_index)
+	    _dl_fdprintf (2, "'%s'", strtab + symtab[symtab_index].st_name);
+	  _dl_fdprintf (2, "\n");
+	  _dl_exit (1);
+	}
+
+    }
+  return goof;
+}
+
+/* This is done as a separate step, because there are cases where
+   information is first copied and later initialized.  This results in
+   the wrong information being copied.  Someone at Sun was complaining about
+   a bug in the handling of _COPY by SVr4, and this may in fact be what he
+   was talking about.  Sigh.  */
+
+/* No, there are cases where the SVr4 linker fails to emit COPY relocs
+   at all.  */
+
+int 
+_dl_parse_copy_information (struct dyn_elf *xpnt, int rel_addr,
+			    int rel_size, int type)
+{
+  int i;
+  char *strtab;
+  int reloc_type;
+  int goof = 0;
+  struct elf32_sym *symtab;
+  struct elf32_rela *rpnt;
+  unsigned int *reloc_addr;
+  unsigned int symbol_addr;
+  struct elf_resolve *tpnt;
+  int symtab_index;
+  /* Now parse the relocation information */
+
+  tpnt = xpnt->dyn;
+
+  rpnt = (struct elf32_rela *) (rel_addr + tpnt->loadaddr);
+  rel_size = rel_size / sizeof (struct elf32_rela);
+
+  symtab = (struct elf32_sym *) (tpnt->dynamic_info[DT_SYMTAB]
+				 + tpnt->loadaddr);
+  strtab = (char *) (tpnt->dynamic_info[DT_STRTAB] + tpnt->loadaddr);
+
+  for (i = 0; i < rel_size; i++, rpnt++)
+    {
+      reloc_addr = (int *) (tpnt->loadaddr + (int) rpnt->r_offset);
+      reloc_type = ELF32_R_TYPE (rpnt->r_info);
+      if (reloc_type != R_68K_COPY)
+	continue;
+      symtab_index = ELF32_R_SYM (rpnt->r_info);
+      symbol_addr = 0;
+      if (tpnt->libtype == program_interpreter
+	  && (!symtab_index
+	      || _dl_symbol (strtab + symtab[symtab_index].st_name)))
+	continue;
+      if (symtab_index)
+	{
+	  symbol_addr = (unsigned int)
+	    _dl_find_hash (strtab + symtab[symtab_index].st_name,
+			   xpnt->next, (int) reloc_addr, NULL, 1);
+	  if (!symbol_addr)
+	    {
+	      _dl_fdprintf (2, "%s: can't resolve symbol '%s'\n",
+			    _dl_progname, strtab + symtab[symtab_index].st_name);
+	      goof++;
+	    }
+	}
+      if (!goof)
+      _dl_memcpy ((void *) symtab[symtab_index].st_value, (void *) symbol_addr,
+		  symtab[symtab_index].st_size);
+    }
+  return goof;
+}
diff --git a/ldso/ldso/m68k/ld_sysdep.h b/ldso/ldso/m68k/ld_sysdep.h
new file mode 100644
index 000000000..24af47ca0
--- /dev/null
+++ b/ldso/ldso/m68k/ld_sysdep.h
@@ -0,0 +1,87 @@
+
+/* Various assmbly language/system dependent hacks that are required
+   so that we can minimize the amount of platform specific code. */
+
+/* Define this if the system uses RELOCA.  */
+#define ELF_USES_RELOCA
+
+/* Get a pointer to the argv array.  On many platforms this can be
+   just the address if the first argument, on other platforms we need
+   to do something a little more subtle here.  */
+#define GET_ARGV(ARGVP, ARGS) ((ARGVP) = ((unsigned int *) &(ARGS)))
+
+/* Get the address of the Global offset table.  This must be absolute,
+   not relative.  */
+#define GET_GOT(X)     __asm__ ("movel %%a5,%0" : "=g" (X))
+
+/* Initialization sequence for a GOT.  */
+#define INIT_GOT(GOT_BASE,MODULE)		\
+{						\
+  GOT_BASE[2] = (int) _dl_linux_resolve;	\
+  GOT_BASE[1] = (int) (MODULE);			\
+}
+
+/* Here is a macro to perform a relocation.  This is only used when
+   bootstrapping the dynamic loader.  RELP is the relocation that we
+   are performing, REL is the pointer to the address we are
+   relocating.  SYMBOL is the symbol involved in the relocation, and
+   LOAD is the load address. */
+#define PERFORM_BOOTSTRAP_RELOC(RELP,REL,SYMBOL,LOAD)		\
+  switch (ELF32_R_TYPE ((RELP)->r_info))			\
+    {								\
+    case R_68K_8:						\
+      *(char *) (REL) = (SYMBOL) + (RELP)->r_addend;		\
+      break;							\
+    case R_68K_16:						\
+      *(short *) (REL) = (SYMBOL) + (RELP)->r_addend;		\
+      break;							\
+    case R_68K_32:						\
+      *(REL) = (SYMBOL) + (RELP)->r_addend;			\
+      break;							\
+    case R_68K_PC8:						\
+      *(char *) (REL) = ((SYMBOL) + (RELP)->r_addend		\
+			 - (unsigned int) (REL));		\
+      break;							\
+    case R_68K_PC16:						\
+      *(short *) (REL) = ((SYMBOL) + (RELP)->r_addend		\
+			  - (unsigned int) (REL));		\
+      break;							\
+    case R_68K_PC32:						\
+      *(REL) = ((SYMBOL) + (RELP)->r_addend			\
+		- (unsigned int) (REL));			\
+      break;							\
+    case R_68K_GLOB_DAT:					\
+    case R_68K_JMP_SLOT:					\
+      *(REL) = (SYMBOL);					\
+      break;							\
+    case R_68K_RELATIVE:		/* Compatibility kludge */ \
+      *(REL) = ((unsigned int) (LOAD) + ((RELP)->r_addend ? : *(REL))); \
+      break;							\
+    default:							\
+      _dl_exit (1);						\
+    }
+
+
+/* Transfer control to the user's application, once the dynamic loader
+   is done.  */
+
+#define START()					\
+  __asm__ volatile ("unlk %%a6\n\t"		\
+		    "jmp %0@"			\
+		    : : "a" (_dl_elf_main));
+
+
+
+/* Here we define the magic numbers that this dynamic loader should accept */
+
+#define MAGIC1 EM_68K
+#undef MAGIC2
+/* Used for error messages */
+#define ELF_TARGET "m68k"
+
+struct elf_resolve;
+extern unsigned int _dl_linux_resolver (int, int, struct elf_resolve *, int);
+
+/* Define this because we do not want to call .udiv in the library.
+   Not needed for m68k.  */
+#define do_rem(result, n, base)  ((result) = (n) % (base))
diff --git a/ldso/ldso/m68k/resolve.S b/ldso/ldso/m68k/resolve.S
new file mode 100644
index 000000000..9b1a24c68
--- /dev/null
+++ b/ldso/ldso/m68k/resolve.S
@@ -0,0 +1,29 @@
+#if 0
+#include <sysdep.h>
+#endif
+/*
+ * These are various helper routines that are needed to run an ELF image.
+ */
+
+#ifdef NO_UNDERSCORE
+#define __dl_linux_resolve _dl_linux_resolve
+#define __dl_linux_resolver _dl_linux_resolver
+#endif
+
+.text
+.even
+
+.globl __dl_linux_resolve
+	.type	__dl_linux_resolve,@function
+__dl_linux_resolve:
+	moveml	%a0/%a1,%sp@-
+#ifdef __PIC__
+	bsrl	__dl_linux_resolver@PLTPC
+#else
+	jbsr	__dl_linux_resolver
+#endif
+	moveml	%sp@+,%a0/%a1
+	addql 	#8,%sp
+	jmp	@(%d0)
+.LFE2:
+	.size __dl_linux_resolve,.LFE2-__dl_linux_resolve
diff --git a/ldso/ldso/m68k/sysdep.h b/ldso/ldso/m68k/sysdep.h
new file mode 100644
index 000000000..24af47ca0
--- /dev/null
+++ b/ldso/ldso/m68k/sysdep.h
@@ -0,0 +1,87 @@
+
+/* Various assmbly language/system dependent hacks that are required
+   so that we can minimize the amount of platform specific code. */
+
+/* Define this if the system uses RELOCA.  */
+#define ELF_USES_RELOCA
+
+/* Get a pointer to the argv array.  On many platforms this can be
+   just the address if the first argument, on other platforms we need
+   to do something a little more subtle here.  */
+#define GET_ARGV(ARGVP, ARGS) ((ARGVP) = ((unsigned int *) &(ARGS)))
+
+/* Get the address of the Global offset table.  This must be absolute,
+   not relative.  */
+#define GET_GOT(X)     __asm__ ("movel %%a5,%0" : "=g" (X))
+
+/* Initialization sequence for a GOT.  */
+#define INIT_GOT(GOT_BASE,MODULE)		\
+{						\
+  GOT_BASE[2] = (int) _dl_linux_resolve;	\
+  GOT_BASE[1] = (int) (MODULE);			\
+}
+
+/* Here is a macro to perform a relocation.  This is only used when
+   bootstrapping the dynamic loader.  RELP is the relocation that we
+   are performing, REL is the pointer to the address we are
+   relocating.  SYMBOL is the symbol involved in the relocation, and
+   LOAD is the load address. */
+#define PERFORM_BOOTSTRAP_RELOC(RELP,REL,SYMBOL,LOAD)		\
+  switch (ELF32_R_TYPE ((RELP)->r_info))			\
+    {								\
+    case R_68K_8:						\
+      *(char *) (REL) = (SYMBOL) + (RELP)->r_addend;		\
+      break;							\
+    case R_68K_16:						\
+      *(short *) (REL) = (SYMBOL) + (RELP)->r_addend;		\
+      break;							\
+    case R_68K_32:						\
+      *(REL) = (SYMBOL) + (RELP)->r_addend;			\
+      break;							\
+    case R_68K_PC8:						\
+      *(char *) (REL) = ((SYMBOL) + (RELP)->r_addend		\
+			 - (unsigned int) (REL));		\
+      break;							\
+    case R_68K_PC16:						\
+      *(short *) (REL) = ((SYMBOL) + (RELP)->r_addend		\
+			  - (unsigned int) (REL));		\
+      break;							\
+    case R_68K_PC32:						\
+      *(REL) = ((SYMBOL) + (RELP)->r_addend			\
+		- (unsigned int) (REL));			\
+      break;							\
+    case R_68K_GLOB_DAT:					\
+    case R_68K_JMP_SLOT:					\
+      *(REL) = (SYMBOL);					\
+      break;							\
+    case R_68K_RELATIVE:		/* Compatibility kludge */ \
+      *(REL) = ((unsigned int) (LOAD) + ((RELP)->r_addend ? : *(REL))); \
+      break;							\
+    default:							\
+      _dl_exit (1);						\
+    }
+
+
+/* Transfer control to the user's application, once the dynamic loader
+   is done.  */
+
+#define START()					\
+  __asm__ volatile ("unlk %%a6\n\t"		\
+		    "jmp %0@"			\
+		    : : "a" (_dl_elf_main));
+
+
+
+/* Here we define the magic numbers that this dynamic loader should accept */
+
+#define MAGIC1 EM_68K
+#undef MAGIC2
+/* Used for error messages */
+#define ELF_TARGET "m68k"
+
+struct elf_resolve;
+extern unsigned int _dl_linux_resolver (int, int, struct elf_resolve *, int);
+
+/* Define this because we do not want to call .udiv in the library.
+   Not needed for m68k.  */
+#define do_rem(result, n, base)  ((result) = (n) % (base))