Support TLS variables on FreeBSD/amd64.

Use the fs_base register to fetch the address of a thread's tcb and
calculate the address of the DTV array.  This value is then passed to
fbsd_get_thread_local_address to compute the final variable address.

Note that fs_base is currently only available via the native target as
core dumps on FreeBSD do not store the value of fs_base.

gdb/ChangeLog:

	* amd64-fbsd-tdep.c (amd64fbsd_get_thread_local_address): New.
	(amd64fbsd_init_abi): Install gdbarch
	"fetch_tls_load_module_address" and "get_thread_local_address"
	methods.

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index ae7203a..2268dd2 100644 (file)
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,12 @@
 2019-03-12  John Baldwin  <jhb@FreeBSD.org>
 
+       * amd64-fbsd-tdep.c (amd64fbsd_get_thread_local_address): New.
+       (amd64fbsd_init_abi): Install gdbarch
+       "fetch_tls_load_module_address" and "get_thread_local_address"
+       methods.
+
+2019-03-12  John Baldwin  <jhb@FreeBSD.org>
+
        * fbsd-tdep.c (fbsd_pspace_data_handle): New variable.
        (struct fbsd_pspace_data): New type.
        (get_fbsd_pspace_data, fbsd_pspace_data_cleanup)

diff --git a/gdb/amd64-fbsd-tdep.c b/gdb/amd64-fbsd-tdep.c
index 403e650..7e2e9ed 100644 (file)
--- a/gdb/amd64-fbsd-tdep.c
+++ b/gdb/amd64-fbsd-tdep.c
@@ -204,6 +204,26 @@ amd64fbsd_iterate_over_regset_sections (struct gdbarch *gdbarch,
       &amd64fbsd_xstateregset, "XSAVE extended state", cb_data);
 }
 
+/* Implement the get_thread_local_address gdbarch method.  */
+
+static CORE_ADDR
+amd64fbsd_get_thread_local_address (struct gdbarch *gdbarch, ptid_t ptid,
+                                   CORE_ADDR lm_addr, CORE_ADDR offset)
+{
+  struct regcache *regcache;
+
+  regcache = get_thread_arch_regcache (ptid, gdbarch);
+
+  target_fetch_registers (regcache, AMD64_FSBASE_REGNUM);
+
+  ULONGEST fsbase;
+  if (regcache->cooked_read (AMD64_FSBASE_REGNUM, &fsbase) != REG_VALID)
+    error (_("Unable to fetch %%fsbase"));
+
+  CORE_ADDR dtv_addr = fsbase + gdbarch_ptr_bit (gdbarch) / 8;
+  return fbsd_get_thread_local_address (gdbarch, dtv_addr, lm_addr, offset);
+}
+
 static void
 amd64fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 {
@@ -241,6 +261,11 @@ amd64fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
   /* FreeBSD uses SVR4-style shared libraries.  */
   set_solib_svr4_fetch_link_map_offsets
     (gdbarch, svr4_lp64_fetch_link_map_offsets);
+
+  set_gdbarch_fetch_tls_load_module_address (gdbarch,
+                                            svr4_fetch_objfile_link_map);
+  set_gdbarch_get_thread_local_address (gdbarch,
+                                       amd64fbsd_get_thread_local_address);
 }
 
 void