Update.

2001-03-12  Jakub Jelinek  <jakub@redhat.com>

	* csu/Makefile (abi-tag.h): Define OS and version separately, allow
	version to be overriden from config.h.
	* csu/abi-note.S: Use OS and version separately, include config.h.
	* elf/dl-load.c (_dl_osversion): New.
	(_dl_map_object_from_fd): Kill some warnings.
	(open_verify): Check .note.ABI-tag of the library if present.
	* elf/Makefile (CPPFLAGS-dl-load.c): Add -I$(csu-objpfx).
	* elf/cache.c (struct cache_entry): Add osversion.
	(print_entry): Print osversion.
	(print_cache): Pass osversion to it.
	(compare): Sort according to osversion.
	(save_cache): Set osversion.
	(add_to_cache): Add osversion argument.
	* sysdeps/generic/ldconfig.h (add_to_cache, process_file,
	process_elf_file): Add osversion argument.
	* elf/readlib.c (process_file): Likewise.
	* sysdeps/generic/readelflib.c (process_elf_file): Likewise.
	* sysdeps/unix/sysv/linux/ia64/readelflib.c (process_elf_file,
	process_elf32_file, process_elf64_file): Likewise.
	* sysdeps/unix/sysv/linux/i386/readelflib.c (process_elf_file,
	process_elf32_file, process_elf64_file): Likewise.
	* sysdeps/unix/sysv/linux/sparc/readelflib.c (process_elf_file,
	process_elf32_file, process_elf64_file): Likewise.
	* elf/ldconfig.c (manual_link): Pass it.
	(search_dir): Issue diagnostic if two libs with the same soname in
	the same directory have different .note.ABI-tag.  Record osversion in
	dlib_entry and use it from there.
	(struct lib_entry): Remove.
	(struct dlib_entry): Add osversion.
	* sysdeps/generic/dl-cache.c (_dl_load_cache_lookup): Check
	osversion.
	* sysdeps/generic/dl-cache.h (struct file_entry_new): Replace __unused
	field with osversion.
	* sysdeps/generic/ldsodefs.h (_dl_osversion): Declare.
	* sysdeps/unix/sysv/linux/init-first.c: Include ldsodefs.h.
	* sysdeps/unix/sysv/linux/dl-osinfo.h (DL_SYSDEP_OSCHECK): Save kernel
	version in _dl_osversion.
	* sysdeps/unix/sysv/linux/configure.in: Define __ABI_TAG_VERSION.
	* Makerules (build-shlib-helper, build-module-helper): New.
	(build-shlib, build-module-helper): Make sure .note.ABI-tag comes
	early.
	* config.h.in (__ABI_TAG_VERSION): Add.
	* elf/dl-minimal.c (__strtoul_internal): Set endptr on return.
	* sysdeps/unix/sysv/linux/i386/dl-librecon.h (EXTRA_LD_ENVVARS):
	Handle LD_ASSUME_KERNEL.
	* sysdeps/unix/sysv/linux/dl-librecon.h: New.

5 files changed, 31 insertions, 8 deletions

diff --git a/sysdeps/generic/dl-cache.c b/sysdeps/generic/dl-cache.c
index 5e16f2852a..65135d467d 100644
--- a/sysdeps/generic/dl-cache.c
+++ b/sysdeps/generic/dl-cache.c
@@ -228,6 +228,8 @@ _dl_load_cache_lookup (const char *name)
 
       /* Only accept hwcap if it's for the right platform.  */
 #define HWCAP_CHECK							       \
+      if (_dl_osversion	&& cache_new->libs[middle].osversion > _dl_osversion)  \
+	continue;							       \
       if (_DL_PLATFORMS_COUNT && platform != -1				       \
 	  && (cache_new->libs[middle].hwcap & _DL_HWCAP_PLATFORM) != 0	       \
 	  && (cache_new->libs[middle].hwcap & _DL_HWCAP_PLATFORM) != platform) \
diff --git a/sysdeps/generic/dl-cache.h b/sysdeps/generic/dl-cache.h
index 2d02dcf347..7938fc0b4a 100644
--- a/sysdeps/generic/dl-cache.h
+++ b/sysdeps/generic/dl-cache.h
@@ -76,7 +76,7 @@ struct file_entry_new
 {
   int32_t flags;		/* This is 1 for an ELF library.  */
   uint32_t key, value;		/* String table indices.  */
-  uint32_t __unused;		/* Align next field always on 8 byte boundary.	*/
+  uint32_t osversion;		/* Required OS version.	 */
   uint64_t hwcap;		/* Hwcap entry.	 */
 };
 
diff --git a/sysdeps/generic/ldconfig.h b/sysdeps/generic/ldconfig.h
index aaad06de5d..0575f48c4b 100644
--- a/sysdeps/generic/ldconfig.h
+++ b/sysdeps/generic/ldconfig.h
@@ -39,17 +39,17 @@ extern void init_cache (void);
 extern void save_cache (const char *cache_name);
 
 extern void add_to_cache (const char *path, const char *lib, int flags,
-			  uint64_t hwcap);
+			  unsigned int osversion, uint64_t hwcap);
 
 /* Declared in readlib.c.  */
 extern int process_file (const char *real_file_name, const char *file_name,
-			 const char *lib, int *flag, char **soname,
-			 int is_link);
+			 const char *lib, int *flag, unsigned int *osversion,
+			 char **soname, int is_link);
 
 /* Declared in readelflib.c.  */
 extern int process_elf_file (const char *file_name, const char *lib, int *flag,
-			     char **soname, void *file_contents,
-			     size_t file_length);
+			     unsigned int *osversion, char **soname,
+			     void *file_contents, size_t file_length);
 
 /* Declared in chroot_canon.c.  */
 extern char *chroot_canon (const char *chroot, const char *name);
diff --git a/sysdeps/generic/ldsodefs.h b/sysdeps/generic/ldsodefs.h
index 0575eaf9a9..bcdcf7dd4f 100644
--- a/sysdeps/generic/ldsodefs.h
+++ b/sysdeps/generic/ldsodefs.h
@@ -173,6 +173,9 @@ extern char **_dl_argv;
 /* Cached value of `getpagesize ()'.  */
 extern size_t _dl_pagesize;
 
+/* OS version.  */
+extern unsigned int _dl_osversion;
+
 /* File descriptor referring to the zero-fill device.  */
 extern int _dl_zerofd;
 
diff --git a/sysdeps/generic/readelflib.c b/sysdeps/generic/readelflib.c
index 2797c282f5..5354526a25 100644
--- a/sysdeps/generic/readelflib.c
+++ b/sysdeps/generic/readelflib.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1999, 2000 Free Software Foundation, Inc.
+/* Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Andreas Jaeger <aj@suse.de>, 1999 and
 		  Jakub Jelinek <jakub@redhat.com>, 1999.
@@ -41,7 +41,8 @@ do								\
 /* Returns 0 if everything is ok, != 0 in case of error.  */
 int
 process_elf_file (const char *file_name, const char *lib, int *flag,
-		  char **soname, void *file_contents, size_t file_length)
+		  unsigned int *osversion, char **soname, void *file_contents,
+		  size_t file_length)
 {
   int i;
   unsigned int j;
@@ -56,6 +57,7 @@ process_elf_file (const char *file_name, const char *lib, int *flag,
   char *dynamic_strings;  
 
   elf_header = (ElfW(Ehdr) *) file_contents;
+  *osversion = 0;
 
   if (elf_header->e_ident [EI_CLASS] != ElfW (CLASS))
     {
@@ -110,6 +112,7 @@ process_elf_file (const char *file_name, const char *lib, int *flag,
 	  dynamic_addr = segment->p_offset;
 	  dynamic_size = segment->p_filesz;
 	  break;
+
 	case PT_INTERP:
 	  program_interpreter = (char *) (file_contents + segment->p_offset);
 	  check_ptr (program_interpreter);
@@ -123,6 +126,21 @@ process_elf_file (const char *file_name, const char *lib, int *flag,
 		break;
 	      }
 	  break;
+
+	case PT_NOTE:
+	  if (!*osversion && segment->p_filesz == 32 && segment->p_align >= 4)
+	    {
+	      ElfW(Word) *abi_note = (ElfW(Word) *) (file_contents
+						     + segment->p_offset);
+	      if (abi_note [0] == 4 && abi_note [1] == 16 && abi_note [2] == 1
+		  && memcmp (abi_note + 3, "GNU", 4) == 0)
+		*osversion = (abi_note [4] << 24) |
+			     ((abi_note [5] & 0xff) << 16) |
+			     ((abi_note [6] & 0xff) << 8) |
+			     (abi_note [7] & 0xff);
+	    }
+	  break;
+
 	default:
 	  break;
 	}