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-rw-r--r--sysdeps/hppa/dl-machine.h605
1 files changed, 605 insertions, 0 deletions
diff --git a/sysdeps/hppa/dl-machine.h b/sysdeps/hppa/dl-machine.h
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+++ b/sysdeps/hppa/dl-machine.h
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+/* Machine-dependent ELF dynamic relocation inline functions.  PA-RISC version.
+   Copyright (C) 1995, 1996, 1997, 1999, 2000 Free Software Foundation, Inc.
+   Contributed by David Huggins-Daines <dhd@debian.org>
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 of the
+   License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If
+   not, write to the Free Software Foundation, Inc.,
+   59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+#ifndef dl_machine_h
+#define dl_machine_h 1
+
+#define ELF_MACHINE_NAME "hppa"
+
+#include <sys/param.h>
+#include <string.h>
+#include <link.h>
+#include <assert.h>
+
+/* These must match the definition of the stub in bfd/elf32-hppa.c. */
+#define SIZEOF_PLT_STUB (4*4)
+#define GOT_FROM_PLT_STUB (4*4)
+
+/* A PLABEL is a function descriptor.  Properly they consist of just
+   FUNC and GP.  But we want to traverse a binary tree too.  See
+   dl-fptr.c for the code (it may be made common between HPPA and
+   IA-64 in the future).
+
+   We call these 'fptr' to make it easier to steal code from IA-64. */
+
+/* ld.so currently has 12 PLABEL32 relocs.  We'll keep this constant
+   large for now in case we require more, as the rest of these will be
+   used by the dynamic program itself (libc.so has quite a few
+   PLABEL32 relocs in it). */
+#define HPPA_BOOT_FPTR_SIZE	256
+
+struct hppa_fptr
+{
+  Elf32_Addr func;
+  Elf32_Addr gp;
+  struct hppa_fptr *next;
+};
+
+extern struct hppa_fptr __boot_ldso_fptr[];
+extern struct hppa_fptr *__fptr_root;
+extern int __fptr_count;
+
+extern Elf32_Addr __hppa_make_fptr (const struct link_map *, Elf32_Addr,
+				    struct hppa_fptr **, struct hppa_fptr *);
+
+/* Return nonzero iff E_MACHINE is compatible with the running host.  */
+static inline int
+elf_machine_matches_host (Elf32_Half e_machine)
+{
+  return e_machine == EM_PARISC;
+}
+
+
+/* Return the link-time address of _DYNAMIC.  */
+static inline Elf32_Addr
+elf_machine_dynamic (void)
+{
+  Elf32_Addr dynamic;
+
+#if 0
+  /* Use this method if GOT address not yet set up.  */
+  asm ("\
+	b,l	1f,%0
+	depi	0,31,2,%0
+1:	addil	L'_GLOBAL_OFFSET_TABLE_ - ($PIC_pcrel$0 - 8),%0
+	ldw	R'_GLOBAL_OFFSET_TABLE_ - ($PIC_pcrel$0 - 12)(%%r1),%0"
+      : "=r" (dynamic) : : "r1");
+#else
+  /* This works because we already have our GOT address available.  */
+  dynamic = (Elf32_Addr) &_DYNAMIC;
+#endif
+
+  return dynamic;
+}
+
+/* Return the run-time load address of the shared object.  */
+static inline Elf32_Addr
+elf_machine_load_address (void)
+{
+  Elf32_Addr dynamic, dynamic_linkaddress;
+
+  asm ("\
+	b,l	1f,%0
+	depi	0,31,2,%0
+1:	addil	L'_DYNAMIC - ($PIC_pcrel$0 - 8),%0
+	ldo	R'_DYNAMIC - ($PIC_pcrel$0 - 12)(%%r1),%1
+	addil	L'_GLOBAL_OFFSET_TABLE_ - ($PIC_pcrel$0 - 16),%0
+	ldw	R'_GLOBAL_OFFSET_TABLE_ - ($PIC_pcrel$0 - 20)(%%r1),%0"
+   : "=r" (dynamic_linkaddress), "=r" (dynamic) : : "r1");
+
+  return dynamic - dynamic_linkaddress;
+}
+
+/* Fixup a PLT entry to bounce directly to the function at VALUE.  */
+static inline Elf32_Addr
+elf_machine_fixup_plt (struct link_map *map, lookup_t t,
+		       const Elf32_Rela *reloc,
+		       Elf32_Addr *reloc_addr, Elf32_Addr value)
+{
+  /* l is the link_map for the caller, t is the link_map for the object
+   * being called */
+  reloc_addr[1] = D_PTR (t, l_info[DT_PLTGOT]);
+  reloc_addr[0] = value;
+  /* Return the PLT slot rather than the function value so that the
+     trampoline can load the new LTP. */
+  return (Elf32_Addr) reloc_addr;
+}
+
+/* Return the final value of a plt relocation.  */
+static inline Elf32_Addr
+elf_machine_plt_value (struct link_map *map, const Elf32_Rela *reloc,
+		       Elf32_Addr value)
+{
+  /* We are rela only */
+  return value + reloc->r_addend;
+}
+
+/* Set up the loaded object described by L so its unrelocated PLT
+   entries will jump to the on-demand fixup code in dl-runtime.c.  */
+
+static inline int
+elf_machine_runtime_setup (struct link_map *l, int lazy, int profile)
+{
+  extern void _dl_runtime_resolve (void);
+  extern void _dl_runtime_profile (void);
+  Elf32_Addr jmprel = D_PTR(l, l_info[DT_JMPREL]);
+
+  if (lazy && jmprel)
+    {
+      Elf32_Addr *got = NULL;
+      Elf32_Addr l_addr;
+      Elf32_Addr end_jmprel;
+      Elf32_Addr iplt;
+
+      /* Relocate all the PLT slots.  */
+      l_addr = l->l_addr;
+      end_jmprel = jmprel + l->l_info[DT_PLTRELSZ]->d_un.d_val;
+      for (iplt = jmprel; iplt < end_jmprel; iplt += sizeof (Elf32_Rela))
+	{
+	  const Elf32_Rela *reloc;
+	  Elf32_Word r_type;
+	  Elf32_Word r_sym;
+	  struct hppa_fptr *fptr;
+
+	  reloc = (const Elf32_Rela *) iplt;
+	  r_type = ELF32_R_TYPE (reloc->r_info);
+	  r_sym = ELF32_R_SYM (reloc->r_info);
+
+	  if (__builtin_expect (r_type == R_PARISC_IPLT, 1))
+	    {
+	      fptr = (struct hppa_fptr *) (reloc->r_offset + l_addr);
+	      if (r_sym != 0)
+		{
+		  /* Relocate the pointer to the stub.  */
+		  fptr->func += l_addr;
+		  /* Instead of the LTP value, we put the reloc offset
+		     here.  The trampoline code will load the proper
+		     LTP and pass the reloc offset to the fixup
+		     function.  */
+		  fptr->gp = iplt - jmprel;
+		  if (!got)
+		    {
+		      static union {
+			unsigned char c[8];
+			Elf32_Addr i[2];
+		      } sig = {{0x00,0xc0,0xff,0xee, 0xde,0xad,0xbe,0xef}};
+
+		      /* Find our .got section.  It's right after the
+			 stub.  */
+		      got = (Elf32_Addr *) (fptr->func + GOT_FROM_PLT_STUB);
+
+		      /* Sanity check to see if the address we are
+                         going to check below is within a reasonable
+                         approximation of the bounds of the PLT (or,
+                         at least, is at an address that won't fault
+                         on read).  Then check for the magic signature
+                         above. */
+		      if (fptr->func < (Elf32_Addr) fptr + sizeof(*fptr))
+			  return 0;
+		      if (fptr->func >
+			  ((Elf32_Addr) fptr
+			   + SIZEOF_PLT_STUB
+			   + ((l->l_info[DT_PLTRELSZ]->d_un.d_val / sizeof (Elf32_Rela))
+			      * 8)))
+			return 0;
+		      if (got[-2] != sig.i[0] || got[-1] != sig.i[1])
+			return 0; /* No lazy linking for you! */
+		    }
+		}
+	      else
+		{
+		  /* Relocate this *ABS* entry.  */
+		  fptr->func = reloc->r_addend + l_addr;
+		  fptr->gp = D_PTR (l, l_info[DT_PLTGOT]);
+		}
+	    }
+	  else if (__builtin_expect (r_type != R_PARISC_NONE, 0))
+	    _dl_reloc_bad_type (l, r_type, 1);
+	}
+
+      if (got)
+	{
+	  register Elf32_Addr ltp __asm__ ("%r19");
+	  /* Identify this shared object. */
+	  got[1] = (Elf32_Addr) l;
+
+	  /* This function will be called to perform the relocation. */
+	  if (__builtin_expect (!profile, 1))
+	    got[-2] =
+	      (Elf32_Addr) ((struct hppa_fptr *)
+			    ((unsigned long) &_dl_runtime_resolve & ~3))->func;
+	  else
+	    {
+	      if (_dl_name_match_p (_dl_profile, l))
+		{
+		  /* This is the object we are looking for.  Say that
+		     we really want profiling and the timers are
+		     started.  */
+		  _dl_profile_map = l;
+		}
+	      got[-2] =
+		(Elf32_Addr) ((struct hppa_fptr *)
+			      ((unsigned long) &_dl_runtime_profile & ~3))->func;
+	    }
+	  got[-1] = ltp;
+	}
+    }
+  return lazy;
+}
+
+/* Initial entry point code for the dynamic linker.
+   The C function `_dl_start' is the real entry point;
+   its return value is the user program's entry point.  */
+
+#define RTLD_START asm ("\
+	.text
+	.globl _start
+	.type _start,@function
+_start:	
+	/* The kernel does not give us an initial stack frame. */
+	ldo	64(%sp),%sp
+	/* Save the relevant arguments (yes, those are the correct
+           registers, the kernel is weird) in their stack slots. */
+	stw	%r25,-40(%sp) /* argc */
+	stw	%r24,-44(%sp) /* argv */
+
+	/* We need the LTP, and we need it now. */
+	/* $PIC_pcrel$0 points 8 bytes past the current instruction,
+	   just like a branch reloc.  This sequence gets us the runtime
+	   address of _DYNAMIC. */
+	bl	0f,%r19
+	depi	0,31,2,%r19	/* clear priviledge bits */
+0:	addil	L'_DYNAMIC - ($PIC_pcrel$0 - 8),%r19
+	ldo	R'_DYNAMIC - ($PIC_pcrel$0 - 12)(%r1),%r26
+
+	/* Also get the link time address from the first entry of the GOT.  */
+	addil	L'_GLOBAL_OFFSET_TABLE_ - ($PIC_pcrel$0 - 16),%r19
+	ldw	R'_GLOBAL_OFFSET_TABLE_ - ($PIC_pcrel$0 - 20)(%r1),%r20
+
+	sub	%r26,%r20,%r20	/* Calculate load offset */
+
+	/* Rummage through the dynamic entries, looking for DT_PLTGOT.  */
+	ldw,ma	8(%r26),%r19
+1:	cmpib,=,n 3,%r19,2f	/* tag == DT_PLTGOT? */
+	cmpib,<>,n 0,%r19,1b
+	ldw,ma	8(%r26),%r19
+
+	/* Uh oh!  We didn't find one.  Abort. */
+	iitlbp	%r0,(%r0)
+
+2:	ldw	-4(%r26),%r19	/* Found it, load value. */
+	add	%r19,%r20,%r19	/* And add the load offset. */
+
+	/* Our initial stack layout is rather different from everyone
+	   else's due to the unique PA-RISC ABI.  As far as I know it
+	   looks like this:
+
+	   -----------------------------------  (this frame created above)
+	   |         32 bytes of magic       |
+	   |---------------------------------|
+	   | 32 bytes argument/sp save area  |
+	   |---------------------------------|  ((current->mm->env_end) + 63 & ~63)
+	   |         N bytes of slack        |
+	   |---------------------------------|
+	   |      envvar and arg strings     |
+	   |---------------------------------|
+	   |	    ELF auxiliary info	     |
+	   |         (up to 28 words)        |
+	   |---------------------------------|
+	   |  Environment variable pointers  |
+	   |         upwards to NULL	     |
+	   |---------------------------------|
+	   |        Argument pointers        |
+	   |         upwards to NULL	     |
+	   |---------------------------------|
+	   |          argc (1 word)          |
+	   -----------------------------------
+
+	  So, obviously, we can't just pass %sp to _dl_start.  That's
+	  okay, argv-4 will do just fine.
+
+	  The pleasant part of this is that if we need to skip
+	  arguments we can just decrement argc and move argv, because
+	  the stack pointer is utterly unrelated to the location of
+	  the environment and argument vectors. */
+
+	/* This is always within range so we'll be okay. */
+	bl	_dl_start,%rp
+	ldo	-4(%r24),%r26
+
+	/* FALLTHRU */
+	.globl _dl_start_user
+	.type _dl_start_user,@function
+_dl_start_user:
+	/* Save the entry point in %r3. */
+	copy	%ret0,%r3
+
+	/* Remember the lowest stack address. */
+	addil	LT'__libc_stack_end,%r19
+	ldw	RT'__libc_stack_end(%r1),%r20
+	stw	%sp,0(%r20)
+
+	/* See if we were called as a command with the executable file
+	   name as an extra leading argument. */
+	addil	LT'_dl_skip_args,%r19
+	ldw	RT'_dl_skip_args(%r1),%r20
+	ldw	0(%r20),%r20
+
+	ldw	-40(%sp),%r25	/* argc */
+	comib,=	0,%r20,.Lnofix  /* FIXME: will be mispredicted */
+	ldw	-44(%sp),%r24   /* argv (delay slot) */
+
+	sub	%r25,%r20,%r25
+	stw	%r25,-40(%sp)
+	sh2add	%r20,%r24,%r24
+	stw	%r24,-44(%sp)
+
+.Lnofix:
+	/* Call _dl_init(_dl_loaded, argc, argv, envp). */
+	addil	LT'_dl_loaded,%r19
+	ldw	RT'_dl_loaded(%r1),%r26
+	ldw	0(%r26),%r26
+	/* envp = argv + argc + 1 */
+	sh2add	%r25,%r24,%r23	
+	bl	_dl_init,%r2
+	ldo	4(%r23),%r23	/* delay slot */
+
+	/* Reload argc, argv  to the registers start.S expects them in (feh) */
+	ldw	-40(%sp),%r25
+	ldw	-44(%sp),%r24
+
+	/* _dl_fini does have a PLT slot now.  I don't know how to get
+	   to it though, so this hack will remain. */
+	.section .data
+__dl_fini_plabel:
+	.word	_dl_fini
+	.word	0xdeadbeef
+	.previous
+
+	addil	LT'__dl_fini_plabel,%r19
+	ldw	RT'__dl_fini_plabel(%r1),%r23
+	stw	%r19,4(%r23)
+	bv	%r0(%r3)
+	depi	2,31,2,%r23	/* delay slot */");
+
+/* This code gets called via the .plt stub, and is used in
+   dl-runtime.c to call the `fixup' function and then redirect to the
+   address it returns.
+   Enter with r19 = reloc offset, r20 = got-8, r21 = fixup ltp.  */
+#define TRAMPOLINE_TEMPLATE(tramp_name, fixup_name) \
+  extern void tramp_name (void);		    \
+  asm ( "\
+	/* Trampoline for " #tramp_name " */
+	.globl " #tramp_name "
+	.type " #tramp_name ",@function
+" #tramp_name ":
+	/* Save return pointer */
+	stw	%r2,-20(%sp)
+	/* Save argument registers in the call stack frame. */
+	stw	%r26,-36(%sp)
+	stw	%r25,-40(%sp)
+	stw	%r24,-44(%sp)
+	stw	%r23,-48(%sp)
+	/* Build a call frame. */
+	stwm	%sp,64(%sp)
+
+	/* Set up args to fixup func.  */
+	ldw	8+4(%r20),%r26	/* got[1] == struct link_map *  */
+	copy	%r19,%r25	/* reloc offset  */
+
+	/* Call the real address resolver. */
+	bl	" #fixup_name ",%r2
+	copy	%r21,%r19	/* delay slot, set fixup func ltp */
+
+	ldwm	-64(%sp),%sp
+	/* Arguments. */
+	ldw	-36(%sp),%r26
+	ldw	-40(%sp),%r25
+	ldw	-44(%sp),%r24
+	ldw	-48(%sp),%r23
+	/* Return pointer. */
+	ldw	-20(%sp),%r2
+	/* Call the real function. */
+	ldw	0(%r28),%r22
+	bv	%r0(%r22)
+	ldw	4(%r28),%r19
+");
+
+#ifndef PROF
+#define ELF_MACHINE_RUNTIME_TRAMPOLINE			\
+  TRAMPOLINE_TEMPLATE (_dl_runtime_resolve, fixup);	\
+  TRAMPOLINE_TEMPLATE (_dl_runtime_profile, profile_fixup);
+#else
+#define ELF_MACHINE_RUNTIME_TRAMPOLINE			\
+  TRAMPOLINE_TEMPLATE (_dl_runtime_resolve, fixup);	\
+  strong_alias (_dl_runtime_resolve, _dl_runtime_profile);
+#endif
+
+
+/* Nonzero iff TYPE describes a relocation that should
+   skip the executable when looking up the symbol value.  */
+#define elf_machine_lookup_noexec_p(type) ((type) == R_PARISC_COPY)
+
+/* Nonzero iff TYPE describes relocation of a PLT entry, so
+   PLT entries should not be allowed to define the value.  */
+#define elf_machine_lookup_noplt_p(type) ((type) == R_PARISC_IPLT \
+					  || (type) == R_PARISC_EPLT)
+
+/* Used by ld.so for ... something ... */
+#define ELF_MACHINE_JMP_SLOT R_PARISC_IPLT
+
+/* We only use RELA. */
+#define ELF_MACHINE_NO_REL 1
+
+#endif /* !dl_machine_h */
+
+/* These are only actually used where RESOLVE_MAP is defined, anyway. */
+#ifdef RESOLVE_MAP
+
+static inline void
+elf_machine_rela (struct link_map *map, const Elf32_Rela *reloc,
+		  const Elf32_Sym *sym, const struct r_found_version *version,
+		  Elf32_Addr *const reloc_addr)
+{
+  const Elf32_Sym *const refsym = sym;
+  unsigned long const r_type = ELF32_R_TYPE (reloc->r_info);
+  struct link_map *sym_map;
+  Elf32_Addr value;
+
+#ifndef RTLD_BOOTSTRAP
+  /* This is defined in rtld.c, but nowhere in the static libc.a; make the
+     reference weak so static programs can still link.  This declaration
+     cannot be done when compiling rtld.c (i.e.  #ifdef RTLD_BOOTSTRAP)
+     because rtld.c contains the common defn for _dl_rtld_map, which is
+     incompatible with a weak decl in the same file.  */
+  weak_extern (_dl_rtld_map);
+#endif
+
+  /* RESOLVE_MAP will return a null value for undefined syms, and
+     non-null for all other syms.  In particular, relocs with no
+     symbol (symbol index of zero), also called *ABS* relocs, will be
+     resolved to MAP.  (The first entry in a symbol table is all
+     zeros, and an all zero Elf32_Sym has a binding of STB_LOCAL.)
+     See RESOLVE_MAP definition in elf/dl-reloc.c  */
+#ifdef RTLD_BOOTSTRAP
+  /* RESOLVE_MAP in rtld.c doesn't have the local sym test.  */
+  sym_map = (ELF32_ST_BIND (sym->st_info) != STB_LOCAL
+	     ? RESOLVE_MAP (&sym, version, r_type) : map);
+#else
+  sym_map = RESOLVE_MAP (&sym, version, r_type);
+#endif
+  if (sym_map)
+    {
+      value = sym ? sym_map->l_addr + sym->st_value : 0;
+      value += reloc->r_addend;
+    }
+  else
+    value = 0;
+
+  switch (r_type)
+    {
+    case R_PARISC_DIR32:
+#ifndef RTLD_BOOTSTRAP
+      /* All hell breaks loose if we try to relocate these twice,
+         because any initialized variables in ld.so that refer to
+         other ones will have their values reset.  In particular,
+         __fptr_next will be reset, sometimes causing endless loops in
+         __hppa_make_fptr().  So don't do that. */
+      if (map == &_dl_rtld_map)
+	return;
+#endif
+      /* Otherwise, nothing more to do here. */
+      break;
+
+    case R_PARISC_PLABEL32:
+      /* Easy rule: If there is a symbol and it is global, then we
+         need to make a dynamic function descriptor.  Otherwise we
+         have the address of a PLT slot for a local symbol which we
+         know to be unique. */
+      if (sym == NULL
+	  || sym_map == NULL
+	  || ELF32_ST_BIND (sym->st_info) == STB_LOCAL)
+	break;
+
+      /* Okay, we need to make ourselves a PLABEL then.  See the IA64
+         code for an explanation of how this works.  */
+#ifndef RTLD_BOOTSTRAP
+      value = __hppa_make_fptr (sym_map, value, &__fptr_root, NULL);
+#else
+      {
+	struct hppa_fptr *p_boot_ldso_fptr;
+	struct hppa_fptr **p_fptr_root;
+	int *p_fptr_count;
+	unsigned long dot;
+
+	/* Go from the top of __boot_ldso_fptr.  As on IA64, we
+	   probably haven't relocated the necessary values by this
+	   point so we have to find them ourselves. */
+
+	asm ("bl	0f,%0
+	      depi	0,31,2,%0
+0:	      addil	L'__boot_ldso_fptr - ($PIC_pcrel$0 - 8),%0
+	      ldo	R'__boot_ldso_fptr - ($PIC_pcrel$0 - 12)(%%r1),%1
+	      addil	L'__fptr_root - ($PIC_pcrel$0 - 16),%0
+	      ldo	R'__fptr_root - ($PIC_pcrel$0 - 20)(%%r1),%2
+	      addil	L'__fptr_count - ($PIC_pcrel$0 - 24),%0
+	      ldo	R'__fptr_count - ($PIC_pcrel$0 - 28)(%%r1),%3"
+	     :
+	     "=r" (dot),
+	     "=r" (p_boot_ldso_fptr),
+	     "=r" (p_fptr_root),
+	     "=r" (p_fptr_count));
+
+	value = __hppa_make_fptr (sym_map, value, p_fptr_root,
+				  &p_boot_ldso_fptr[--*p_fptr_count]);
+      }
+#endif
+      break;
+
+    case R_PARISC_IPLT:
+      if (__builtin_expect (sym_map != NULL, 1))
+	elf_machine_fixup_plt (NULL, sym_map, reloc, reloc_addr, value);
+      else
+	{
+	  /* If we get here, it's a (weak) undefined sym.  */
+	  elf_machine_fixup_plt (NULL, map, reloc, reloc_addr, value);
+	}
+      return;
+
+    case R_PARISC_COPY:
+      if (__builtin_expect (sym == NULL, 0))
+	/* This can happen in trace mode if an object could not be
+	   found.  */
+	break;
+      if (__builtin_expect (sym->st_size > refsym->st_size, 0)
+	  || (__builtin_expect (sym->st_size < refsym->st_size, 0)
+	      && __builtin_expect (_dl_verbose, 0)))
+	{
+	  const char *strtab;
+
+	  strtab = (const char *) D_PTR (map, l_info[DT_STRTAB]);
+	  _dl_sysdep_error (_dl_argv[0] ?: "<program name unknown>",
+			    ": Symbol `", strtab + refsym->st_name,
+			    "' has different size in shared object, "
+			    "consider re-linking\n", NULL);
+	}
+      memcpy (reloc_addr, (void *) value,
+	      MIN (sym->st_size, refsym->st_size));
+      return;
+
+    case R_PARISC_NONE:	/* Alright, Wilbur. */
+      return;
+
+    default:
+      _dl_reloc_bad_type (map, r_type, 0);
+    }
+
+  *reloc_addr = value;
+}
+
+static inline void
+elf_machine_lazy_rel (struct link_map *map,
+		      Elf32_Addr l_addr, const Elf32_Rela *reloc)
+{
+  /* We don't have anything to do here.  elf_machine_runtime_setup has
+     done all the relocs already.  */
+}
+
+#endif /* RESOLVE_MAP */