Add a helper function to resolve TLS variable addresses for FreeBSD.

The fbsd_get_thread_local_address function accepts the base address of
a thread's DTV array and the base address of an object file's link map
and uses this to compute a TLS variable's address.  FreeBSD
architectures use an architecture-specific method to determine the
address of the DTV array pointer and call this helper function to
perform the rest of the address calculation.

	* fbsd-tdep.c (fbsd_pspace_data_handle): New variable.
	(struct fbsd_pspace_data): New type.
	(get_fbsd_pspace_data, fbsd_pspace_data_cleanup)
	(fbsd_read_integer_by_name, fbsd_fetch_rtld_offsets)
	(fbsd_get_tls_index, fbsd_get_thread_local_address): New function.
	(_initialize_fbsd_tdep): Initialize 'fbsd_pspace_data_handle'.
	* fbsd-tdep.c (fbsd_get_thread_local_address): New prototype.

1 files changed, 11 insertions, 0 deletions

diff --git a/gdb/fbsd-tdep.h b/gdb/fbsd-tdep.h
index efd7c2c..0e29508 100644
--- a/gdb/fbsd-tdep.h
+++ b/gdb/fbsd-tdep.h
@@ -60,4 +60,15 @@ extern void fbsd_info_proc_mappings_entry (int addr_bit, ULONGEST kve_start,
 					   int kve_flags, int kve_protection,
 					   const void *kve_path);
 
+/* Helper function to fetch the address of a thread-local variable.
+   DTV_ADDR is the base address of the thread's dtv array.  LM_ADDR is
+   the address of the link_map structure for the associated object
+   file.  OFFSET is the offset of the variable in the object file's
+   thread-local variable block.  */
+
+extern CORE_ADDR fbsd_get_thread_local_address (struct gdbarch *gdbarch,
+						CORE_ADDR dtv_addr,
+						CORE_ADDR lm_addr,
+						CORE_ADDR offset);
+
 #endif /* fbsd-tdep.h */