With this commit, I hereby pronounce gensetdefs past its use-by date.

Replace the a.out emulation of 'struct linker_set' with something
a little more flexible.  <sys/linker_set.h> now provides macros for
accessing elements and completely hides the implementation.

The linker_set.h macros have been on the back burner in various
forms since 1998 and has ideas and code from Mike Smith (SET_FOREACH()),
John Polstra (ELF clue) and myself (cleaned up API and the conversion
of the rest of the kernel to use it).

The macros declare a strongly typed set.  They return elements with the
type that you declare the set with, rather than a generic void *.

For ELF, we use the magic ld symbols (__start_<setname> and
__stop_<setname>).  Thanks to Richard Henderson <rth@redhat.com> for the
trick about how to force ld to provide them for kld's.

For a.out, we use the old linker_set struct.

NOTE: the item lists are no longer null terminated.  This is why
the code impact is high in certain areas.

The runtime linker has a new method to find the linker set
boundaries depending on which backend format is in use.

linker sets are still module/kld unfriendly and should never be used
for anything that may be modular one day.

Reviewed by:	eivind

1 files changed, 8 insertions, 0 deletions

diff --git a/sys/sys/linker.h b/sys/sys/linker.h
index 87a2a83..671bbe8 100644
--- a/sys/sys/linker.h
+++ b/sys/sys/linker.h
@@ -139,6 +139,14 @@ caddr_t linker_file_lookup_symbol(linker_file_t _file, const char* _name,
 				  int _deps);
 
 /*
+ * Lookup a linker set in a file.  Return pointers to the first entry,
+ * last + 1, and count of entries.  Use: for (p = start; p < stop; p++) {}
+ * void *start is really: "struct yoursetmember ***start;"
+ */
+int linker_file_lookup_set(linker_file_t _file, const char *_name,
+			   void *_start, void *_stop, int *_count);
+
+/*
  * This routine is responsible for finding dependencies of userland
  * initiated kldload(2)'s of files.
  */