ARM: Support loading unmarked objects from cache.

ARM now supports loading unmarked objects from
the dynamic loader cache. Unmarked objects can
be used with the hard-float or soft-float ABI.
We must support loading unmarked objects during
the transition period from a binutils that does
not mark objects to one that does mark them with
the correct ELF flags.

Signed-off-by: Carlos O'Donell <carlos@redhat.com>

6 files changed, 31 insertions, 2 deletions

diff --git a/ChangeLog b/ChangeLog
index e387dd2847..190e46037e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2013-02-08  Carlos O'Donell  <carlos@redhat.com>
+
+	* sysdeps/generic/ldconfig.h: Define FLAG_ARM_LIBSF.
+	* elf/cache.c (print_entry): Add FLAG_ARM_LIBSF support.
+
 2013-02-08  Joseph Myers  <joseph@codesourcery.com>
 
 	[BZ #13550]
diff --git a/elf/cache.c b/elf/cache.c
index 9901952722..699550bb60 100644
--- a/elf/cache.c
+++ b/elf/cache.c
@@ -100,6 +100,10 @@ print_entry (const char *lib, int flag, unsigned int osversion,
     case FLAG_AARCH64_LIB64:
       fputs (",AArch64", stdout);
       break;
+    /* Uses the ARM soft-float ABI.  */
+    case FLAG_ARM_LIBSF:
+      fputs (",soft-float", stdout);
+      break;
     case 0:
       break;
     default:
diff --git a/ports/ChangeLog.arm b/ports/ChangeLog.arm
index b4fb546d96..c4493546e8 100644
--- a/ports/ChangeLog.arm
+++ b/ports/ChangeLog.arm
@@ -1,3 +1,11 @@
+2013-02-08  Carlos O'Donell  <carlos@redhat.com>
+
+	* sysdeps/unix/sysv/linux/arm/dl-cache.h
+	[__ARM_PCS_VFP] (_dl_cache_check_flags): Allow plain FLAG_ELF_LIBC6.
+	[!__ARM_PCS_VFP] (_dl_cache_check_flags): Likewise.
+	* sysdeps/unix/sysv/linux/arm/readelflib.c (process_elf_file):
+	Set FLAG_ARM_LIBSF for soft-float ABI otherwise just FLAG_ELF_LIBC6.
+
 2013-02-04  Joseph Myers  <joseph@codesourcery.com>
 
 	[BZ #13550]
diff --git a/ports/sysdeps/unix/sysv/linux/arm/dl-cache.h b/ports/sysdeps/unix/sysv/linux/arm/dl-cache.h
index acc4f28645..504fecab58 100644
--- a/ports/sysdeps/unix/sysv/linux/arm/dl-cache.h
+++ b/ports/sysdeps/unix/sysv/linux/arm/dl-cache.h
@@ -18,12 +18,17 @@
 
 #include <ldconfig.h>
 
+/* In order to support the transition from unmarked objects
+   to marked objects we must treat unmarked objects as
+   compatible with either FLAG_ARM_LIBHF or FLAG_ARM_LIBSF.  */
 #ifdef __ARM_PCS_VFP
 # define _dl_cache_check_flags(flags) \
-  ((flags) == (FLAG_ARM_LIBHF | FLAG_ELF_LIBC6))
+  ((flags) == (FLAG_ARM_LIBHF | FLAG_ELF_LIBC6) \
+   || (flags) == FLAG_ELF_LIBC6)
 #else
 # define _dl_cache_check_flags(flags) \
-  ((flags) == FLAG_ELF_LIBC6)
+  ((flags) == (FLAG_ARM_LIBSF | FLAG_ELF_LIBC6) \
+   || (flags) == FLAG_ELF_LIBC6)
 #endif
 
 #include_next <dl-cache.h>
diff --git a/ports/sysdeps/unix/sysv/linux/arm/readelflib.c b/ports/sysdeps/unix/sysv/linux/arm/readelflib.c
index 81e5ccb55f..3efb6134c3 100644
--- a/ports/sysdeps/unix/sysv/linux/arm/readelflib.c
+++ b/ports/sysdeps/unix/sysv/linux/arm/readelflib.c
@@ -46,6 +46,12 @@ process_elf_file (const char *file_name, const char *lib, int *flag,
 	  if (elf32_header->e_flags & EF_ARM_ABI_FLOAT_HARD)
 	    *flag = FLAG_ARM_LIBHF|FLAG_ELF_LIBC6;
 	  else if (elf32_header->e_flags & EF_ARM_ABI_FLOAT_SOFT)
+	    *flag = FLAG_ARM_LIBSF|FLAG_ELF_LIBC6;
+	  else
+	    /* We must assume the unmarked objects are compatible
+	       with all ABI variants. Such objects may have been
+	       generated in a transitional period when the ABI
+	       tags were not added to all objects.  */
 	    *flag = FLAG_ELF_LIBC6;
 	}
     }
diff --git a/sysdeps/generic/ldconfig.h b/sysdeps/generic/ldconfig.h
index 57a9a468ad..91190aa0cd 100644
--- a/sysdeps/generic/ldconfig.h
+++ b/sysdeps/generic/ldconfig.h
@@ -36,6 +36,7 @@
 #define FLAG_X8664_LIBX32	0x0800
 #define FLAG_ARM_LIBHF		0x0900
 #define FLAG_AARCH64_LIB64	0x0a00
+#define FLAG_ARM_LIBSF		0x0b00
 
 /* Name of auxiliary cache.  */
 #define _PATH_LDCONFIG_AUX_CACHE "/var/cache/ldconfig/aux-cache"