gdb: xtensa: handle privileged registers

xtensa GDB may be used with both bare-metal and linux-based
applications. In case of bare-metal application gdbserver is able to
provide information about all CPU registers: both unprivileged and
privileged. In case of linux-based application only a small subset of
privileged state is available. Currently xtensa GDB only expects
unprivileged registers in 'g' packets and it fails to communicate with
server that sends both privileged and unprivileged registers.

Allow bare-metal xtensa GDB to deal with both privileged and
unprivileged registers by initializing tdep->num_regs with the total
number of target CPU registers. Keep linux-based xtensa GDB
functionality as is by copying tdep->num_nopriv_regs to tdep->num_regs.

gdb/
2018-05-09  Max Filippov  <jcmvbkbc@gmail.com>

	* xtensa-linux-tdep.c (xtensa-tdep.h): New include.
	(xtensa_linux_init_abi): Limit tdep->num_regs by
	tdep->num_nopriv_regs.
	* xtensa-tdep.c (xtensa_derive_tdep): Calculate
	tdep->num_nopriv_regs and only copy it to tdep->num_regs if it's
	not initialized.

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index a1059ae..728ed8c 100644 (file)
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,12 @@
+2018-05-09  Max Filippov  <jcmvbkbc@gmail.com>
+
+       * xtensa-linux-tdep.c (xtensa-tdep.h): New include.
+       (xtensa_linux_init_abi): Limit tdep->num_regs by
+       tdep->num_nopriv_regs.
+       * xtensa-tdep.c (xtensa_derive_tdep): Calculate
+       tdep->num_nopriv_regs and only copy it to tdep->num_regs if it's
+       not initialized.
+
 2018-05-08  Simon Marchi  <simon.marchi@ericsson.com>
 
        * unittests/string_view-selftests.c: Define GNULIB_NAMESPACE.

diff --git a/gdb/xtensa-linux-tdep.c b/gdb/xtensa-linux-tdep.c
index a9b30c7..b62085d 100644 (file)
--- a/gdb/xtensa-linux-tdep.c
+++ b/gdb/xtensa-linux-tdep.c
@@ -18,6 +18,7 @@
    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
 #include "defs.h"
+#include "xtensa-tdep.h"
 #include "osabi.h"
 #include "linux-tdep.h"
 #include "solib-svr4.h"
@@ -97,6 +98,11 @@ xtensa_linux_gdb_signal_to_target (struct gdbarch *gdbarch,
 static void
 xtensa_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 {
+  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+  if (tdep->num_nopriv_regs < tdep->num_regs)
+    tdep->num_regs = tdep->num_nopriv_regs;
+
   linux_init_abi (info, gdbarch);
 
   set_solib_svr4_fetch_link_map_offsets

diff --git a/gdb/xtensa-tdep.c b/gdb/xtensa-tdep.c
index a1ecf5f..01f9616 100644 (file)
--- a/gdb/xtensa-tdep.c
+++ b/gdb/xtensa-tdep.c
@@ -3145,16 +3145,12 @@ xtensa_derive_tdep (struct gdbarch_tdep *tdep)
        max_size = rmap->byte_size;
       if (rmap->mask != 0 && tdep->num_regs == 0)
        tdep->num_regs = n;
-      /* Find out out how to deal with priveleged registers.
-
-         if ((rmap->flags & XTENSA_REGISTER_FLAGS_PRIVILEGED) != 0
-              && tdep->num_nopriv_regs == 0)
-           tdep->num_nopriv_regs = n;
-      */
       if ((rmap->flags & XTENSA_REGISTER_FLAGS_PRIVILEGED) != 0
-         && tdep->num_regs == 0)
-       tdep->num_regs = n;
+         && tdep->num_nopriv_regs == 0)
+       tdep->num_nopriv_regs = n;
     }
+  if (tdep->num_regs == 0)
+    tdep->num_regs = tdep->num_nopriv_regs;
 
   /* Number of pseudo registers.  */
   tdep->num_pseudo_regs = n - tdep->num_regs;