Support for R_ARM_IRELATIVE relocations.

diff --git a/ChangeLog.arm b/ChangeLog.arm
index 9db4a3499eddcc2615a8c411adc423d97a8a5b20..4c1207ace1856c4b71bdf51a3a7b126b522780d2 100644 (file)
--- a/ChangeLog.arm
+++ b/ChangeLog.arm
@@ -1,3 +1,10 @@
+2011-04-26  Richard Sandiford  <richard.sandiford@linaro.org>
+
+       * sysdeps/arm/dl-machine.h (elf_machine_rel): Handle STT_GNU_IFUNC
+       and R_ARM_IRELATIVE.
+       (elf_machine_rela): Likewise.
+       * sysdeps/arm/dl-irel.h: New file.
+
 2011-04-11  Joseph Myers  <joseph@codesourcery.com>
 
        * sysdeps/arm/dl-tls.h (TLS_DTV_UNALLOCATED): Define.

diff --git a/sysdeps/arm/dl-irel.h b/sysdeps/arm/dl-irel.h
new file mode 100644 (file)
index 0000000..735e0a3
--- /dev/null
+++ b/sysdeps/arm/dl-irel.h
@@ -0,0 +1,45 @@
+/* Machine-dependent ELF indirect relocation inline functions.
+   ARM version.
+   Copyright (C) 2009, 2010 Free Software Foundation, Inc.
+   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 Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#ifndef _DL_IREL_H
+#define _DL_IREL_H
+
+#include <stdio.h>
+#include <unistd.h>
+
+#define ELF_MACHINE_IREL       1
+
+static inline void
+__attribute ((always_inline))
+elf_irel (const Elf32_Rel *reloc)
+{
+  Elf32_Addr *const reloc_addr = (void *) reloc->r_offset;
+  const unsigned long int r_type = ELF32_R_TYPE (reloc->r_info);
+
+  if (__builtin_expect (r_type == R_ARM_IRELATIVE, 1))
+    {
+      Elf32_Addr value = ((Elf32_Addr (*) (void)) (*reloc_addr)) ();
+      *reloc_addr = value;
+    }
+  else
+    __libc_fatal ("unexpected reloc type in static binary");
+}
+
+#endif /* dl-irel.h */

diff --git a/sysdeps/arm/dl-machine.h b/sysdeps/arm/dl-machine.h
index 9929f76c3e13e9ccfaa8aa82c4244678ebe11f98..b5d477be61440a053005c0679d77e2facbbd57bc 100644 (file)
--- a/sysdeps/arm/dl-machine.h
+++ b/sysdeps/arm/dl-machine.h
@@ -374,6 +374,12 @@ elf_machine_rel (struct link_map *map, const Elf32_Rel *reloc,
       struct link_map *sym_map = RESOLVE_MAP (&sym, version, r_type);
       Elf32_Addr value = sym_map == NULL ? 0 : sym_map->l_addr + sym->st_value;
 
+      if (sym != NULL
+         && __builtin_expect (ELFW(ST_TYPE) (sym->st_info) == STT_GNU_IFUNC,
+                              0)
+         && __builtin_expect (sym->st_shndx != SHN_UNDEF, 1))
+       value = ((Elf32_Addr (*) (void)) value) ();
+
       switch (r_type)
        {
        case R_ARM_COPY:
@@ -487,7 +493,8 @@ elf_machine_rel (struct link_map *map, const Elf32_Rel *reloc,
             *reloc_addr = value;
          }
          break;
-#if defined USE_TLS && !defined RTLD_BOOTSTRAP
+#if !defined RTLD_BOOTSTRAP
+#if defined USE_TLS
        case R_ARM_TLS_DTPMOD32:
          /* Get the information from the link map returned by the
             resolv function.  */
@@ -507,6 +514,12 @@ elf_machine_rel (struct link_map *map, const Elf32_Rel *reloc,
              *reloc_addr += sym->st_value + sym_map->l_tls_offset;
            }
          break;
+#endif
+       case R_ARM_IRELATIVE:
+         value = map->l_addr + *reloc_addr;
+         value = ((Elf32_Addr (*) (void)) value) ();
+         *reloc_addr = value;
+         break;
 #endif
        default:
          _dl_reloc_bad_type (map, r_type, 0);
@@ -537,6 +550,12 @@ elf_machine_rela (struct link_map *map, const Elf32_Rela *reloc,
       struct link_map *sym_map = RESOLVE_MAP (&sym, version, r_type);
       Elf32_Addr value = sym_map == NULL ? 0 : sym_map->l_addr + sym->st_value;
 
+      if (sym != NULL
+         && __builtin_expect (ELFW(ST_TYPE) (sym->st_info) == STT_GNU_IFUNC,
+                              0)
+         && __builtin_expect (sym->st_shndx != SHN_UNDEF, 1))
+       value = ((Elf32_Addr (*) (void)) value) ();
+
       switch (r_type)
        {
 #  ifndef RESOLVE_CONFLICT_FIND_MAP
@@ -588,7 +607,8 @@ elf_machine_rela (struct link_map *map, const Elf32_Rela *reloc,
             *reloc_addr = value;
          }
          break;
-#if defined USE_TLS && !defined RTLD_BOOTSTRAP
+#if !defined RTLD_BOOTSTRAP
+#if defined USE_TLS
        case R_ARM_TLS_DTPMOD32:
          /* Get the information from the link map returned by the
             resolv function.  */
@@ -608,6 +628,12 @@ elf_machine_rela (struct link_map *map, const Elf32_Rela *reloc,
                             + reloc->r_addend);
            }
          break;
+#endif
+       case R_ARM_IRELATIVE:
+         value = map->l_addr + *reloc_addr;
+         value = ((Elf32_Addr (*) (void)) value) ();
+         *reloc_addr = value;
+         break;
 #endif
        default:
          _dl_reloc_bad_type (map, r_type, 0);