[patch] handle unaligned arm abs relocs

[Mike Frysinger <vapier at gentoo dot org>]

background can be found here:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51456

patch is below
-mike

2011-12-12  Mike Frysinger  <vapier@gentoo.org>

	* dl-machine.h (elf_machine_rel, R_ARM_ABS32): Declare "reloc_value".
	Replace reloc_addr addition with memcpy's.

diff --git a/sysdeps/arm/dl-machine.h b/sysdeps/arm/dl-machine.h
index 5ceeaa9..fe64800 100644
--- a/sysdeps/arm/dl-machine.h
+++ b/sysdeps/arm/dl-machine.h
@@ -413,6 +413,7 @@ elf_machine_rel (struct link_map *map, const Elf32_Rel 
*reloc,
 	  break;
 	case R_ARM_ABS32:
 	  {
+	    Elf32_Addr reloc_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
@@ -431,7 +432,10 @@ elf_machine_rel (struct link_map *map, const Elf32_Rel 
*reloc,
 		 used while loading those libraries.  */
 	      value -= map->l_addr + refsym->st_value;
 # endif
-	    *reloc_addr += value;
+	    /* Support relocations on mis-aligned offsets.  */
+	    memcpy (&reloc_value, reloc_addr_arg, sizeof (reloc_value));
+	    reloc_value += value;
+	    memcpy (reloc_addr_arg, &reloc_value, sizeof (reloc_value));
 	    break;
 	  }
 	case R_ARM_TLS_DESC:

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