Use the target architecture when encoding tracepoint actions

This patch uses the target architecture rather then the objfile
architecture when encoding tracepoint actions.

The target architecture may contain additional registers. E.g. ARM VFP
registers. This information is needed to allow their collection. Since we
can never know whether the registers numbers in the target match the
binary's we have to use tdesc here.

One note about combined debuggers / multi-inferior from Pedro Alves:

In the combined debugger case taking Cell as the practical example that
gdb supports currently:

In that case, the main target_gdbarch() will be powerpc, but you may have set a
tracepoint on _spu_ code, which has a different gdbarch.  so for that case,
target_gdbarch would be wrong.  I think that in that case, we'd need to
find __the_ target/tdesc gdbarch that is (bfd) compatible with the
objfile's gdbarch.

I think cell/spu gdbserver doesn't support tracepoints, so we can ignore
this for now.

The multi-inferior/process case is somewhat related, but its simpler.
each inferior has its own gdbarch.

That is, target_gdbarch depends on the current inferior selected.
In fact, that just returns inferior->gdbarch nowaways.

No regressions, tested on ubuntu 14.04 ARMv7 and x86.
With gdbserver-{native,extended} / { -marm -mthumb }

gdb/ChangeLog:

	* tracepoint.c (encode_actions_1): Use target_gdbarch () rather
	than loc->gdbarch.

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 0ed35faf0e4840837d798752fe159e8304a0f6b1..31d01cb780e853a1ca298a72b32d66ef913b6c43 100644 (file)
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,8 @@
+2016-02-11  Antoine Tremblay  <antoine.tremblay@ericsson.com>
+
+       * tracepoint.c (encode_actions_1): Use target_gdbarch () rather
+       than loc->gdbarch.
+
 2016-02-10  Marcin Kościelnicki  <koriakin@0x04.net>
 
        * tracefile-tfile.c (trace_tdesc): New static variable.

diff --git a/gdb/tracepoint.c b/gdb/tracepoint.c
index bc45470153e504f631e8a87340a2f008fe1ce6e9..8b393db1df586e4e57bc05f523171cae7df46740 100644 (file)
--- a/gdb/tracepoint.c
+++ b/gdb/tracepoint.c
@@ -1428,14 +1428,14 @@ encode_actions_1 (struct command_line *action,
 
              if (0 == strncasecmp ("$reg", action_exp, 4))
                {
-                 for (i = 0; i < gdbarch_num_regs (tloc->gdbarch); i++)
+                 for (i = 0; i < gdbarch_num_regs (target_gdbarch ()); i++)
                    add_register (collect, i);
                  action_exp = strchr (action_exp, ',');        /* more? */
                }
              else if (0 == strncasecmp ("$arg", action_exp, 4))
                {
                  add_local_symbols (collect,
-                                    tloc->gdbarch,
+                                    target_gdbarch (),
                                     tloc->address,
                                     frame_reg,
                                     frame_offset,
@@ -1446,7 +1446,7 @@ encode_actions_1 (struct command_line *action,
              else if (0 == strncasecmp ("$loc", action_exp, 4))
                {
                  add_local_symbols (collect,
-                                    tloc->gdbarch,
+                                    target_gdbarch (),
                                     tloc->address,
                                     frame_reg,
                                     frame_offset,
@@ -1459,7 +1459,7 @@ encode_actions_1 (struct command_line *action,
                  struct cleanup *old_chain1 = NULL;
 
                  aexpr = gen_trace_for_return_address (tloc->address,
-                                                       tloc->gdbarch,
+                                                       target_gdbarch (),
                                                        trace_string);
 
                  old_chain1 = make_cleanup_free_agent_expr (aexpr);
@@ -1513,7 +1513,7 @@ encode_actions_1 (struct command_line *action,
                      {
                        const char *name = &exp->elts[2].string;
 
-                       i = user_reg_map_name_to_regnum (tloc->gdbarch,
+                       i = user_reg_map_name_to_regnum (target_gdbarch (),
                                                         name, strlen (name));
                        if (i == -1)
                          internal_error (__FILE__, __LINE__,
@@ -1543,7 +1543,7 @@ encode_actions_1 (struct command_line *action,
 
                        collect_symbol (collect,
                                        exp->elts[2].symbol,
-                                       tloc->gdbarch,
+                                       target_gdbarch (),
                                        frame_reg,
                                        frame_offset,
                                        tloc->address,