[PATCH 3/4] Use flexible target descriptors for aarch64

[Alan Hayward <Alan dot Hayward at arm dot com>]

This patch adds flexible target description code autogenerated from the
aarch64 feature files (fpu and core). It then moves both gdb and gdbserver
across to use it.


Tested on a --enable-targets=all build and aarch64 build with board
files unix, native-gdbserver and unittest.exp.

Alan.

2017-10-25  Alan Hayward  <alan.hayward@arm.com>

gdb/
	* aarch64-tdep.c (_initialize_aarch64_tdep): Remove init.
	* arch/aarch64.c (aarch64_create_target_description): Create
	new target description.
	* features/Makefile: Add new files.
	* features/aarch64-core.c: New autogenerated file.
	* features/aarch64-fpu.c: New autogenerated file.
	* target-descriptions.c (maint_print_c_tdesc_cmd): Check for aarch64.

gdbserver/
	* linux-aarch64-ipa.c (initialize_low_tracepoint): Remove init.
	* linux-aarch64-low.c (initialize_low_arch): Remove init.
	* linux-aarch64-tdesc.c (aarch64_linux_read_description): Add init.


diff --git a/gdb/aarch64-tdep.c b/gdb/aarch64-tdep.c
index 96d1391a193a43100e0fd4a262210ac7e90242dc..5d6f455319f3003240239f7977da9f994765f4d3 100644
--- a/gdb/aarch64-tdep.c
+++ b/gdb/aarch64-tdep.c
@@ -54,9 +54,6 @@

 #include "record.h"
 #include "record-full.h"
-
-#include "features/aarch64.c"
-
 #include "arch/aarch64-insn.h"

 #include "opcode/aarch64.h"
@@ -3059,8 +3056,6 @@ _initialize_aarch64_tdep (void)
   gdbarch_register (bfd_arch_aarch64, aarch64_gdbarch_init,
 		    aarch64_dump_tdep);

-  initialize_tdesc_aarch64 ();
-
   /* Debug this file's internals.  */
   add_setshow_boolean_cmd ("aarch64", class_maintenance, &aarch64_debug, _("\
 Set AArch64 debugging."), _("\
diff --git a/gdb/arch/aarch64.c b/gdb/arch/aarch64.c
index 95d9906f10e660fda99d73a0d2a9d184fd3a7b52..85a44da93c71158de5d8a735b6a448b09c9dac1a 100644
--- a/gdb/arch/aarch64.c
+++ b/gdb/arch/aarch64.c
@@ -15,16 +15,39 @@
    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

-
+#include <stdlib.h>
+#include <string.h>
 #include "aarch64.h"

-extern struct target_desc *tdesc_aarch64;
+#ifdef GDBSERVER
+#include "common/common-defs.h"
+#include "common/gdb_vecs.h"
+#include "common/vec.h"
+#include "tdesc.h"
+#else
+#include "defs.h"
+#include "osabi.h"
+#include "target-descriptions.h"
+#endif
+
+#include "../features/aarch64-core.c"
+#include "../features/aarch64-fpu.c"

 /* Create the aarch64 target description.  */

 target_desc *
 aarch64_create_target_description ()
 {
-  return tdesc_aarch64;
-}
+  target_desc *tdesc = allocate_target_description ();
+
+#ifndef IN_PROCESS_AGENT
+  set_tdesc_architecture (tdesc, "aarch64");
+#endif

+  long regnum = 0;
+
+  regnum = create_feature_aarch64_core (tdesc, regnum);
+  regnum = create_feature_aarch64_fpu (tdesc, regnum);
+
+  return tdesc;
+}
diff --git a/gdb/features/Makefile b/gdb/features/Makefile
index 2d8e3fea3687de1ba5b9a9cffc42728c9e6808e5..268e1b6f4ab09f23409dac64a44c61f19bf0f1f3 100644
--- a/gdb/features/Makefile
+++ b/gdb/features/Makefile
@@ -207,7 +207,9 @@ $(outdir)/%.dat: %.xml number-regs.xsl sort-regs.xsl gdbserver-regs.xsl
 	  $(XSLTPROC) gdbserver-regs.xsl - >> $(outdir)/$*.tmp
 	sh ../../move-if-change $(outdir)/$*.tmp $(outdir)/$*.dat

-FEATURE_XMLFILES = i386/32bit-core.xml \
+FEATURE_XMLFILES = aarch64-core.xml \
+	aarch64-fpu.xml \
+	i386/32bit-core.xml \
 	i386/32bit-sse.xml \
 	i386/32bit-linux.xml \
 	i386/32bit-avx.xml \
diff --git a/gdb/features/aarch64-core.c b/gdb/features/aarch64-core.c
new file mode 100644
index 0000000000000000000000000000000000000000..a735515ae67211d29634e7c39b375a36edef2bb1
--- /dev/null
+++ b/gdb/features/aarch64-core.c
@@ -0,0 +1,72 @@
+/* THIS FILE IS GENERATED.  -*- buffer-read-only: t -*- vi:set ro:
+  Original: aarch64-core.xml.tmp */
+
+#ifdef GDBSERVER
+#include "tdesc.h"
+#else
+#include "defs.h"
+#include "osabi.h"
+#include "target-descriptions.h"
+#endif
+
+static int
+create_feature_aarch64_core (struct target_desc *result, long regnum)
+{
+  struct tdesc_feature *feature;
+
+  feature = tdesc_create_feature (result, "org.gnu.gdb.aarch64.core", "aarch64-core.xml");
+  struct tdesc_type *field_type;
+  struct tdesc_type *type;
+  type = tdesc_create_flags (feature, "cpsr_flags", 4);
+  tdesc_add_flag (type, 0, "SP");
+  tdesc_add_flag (type, 1, "");
+  tdesc_add_bitfield (type, "EL", 2, 3);
+  tdesc_add_flag (type, 4, "nRW");
+  tdesc_add_flag (type, 5, "");
+  tdesc_add_flag (type, 6, "F");
+  tdesc_add_flag (type, 7, "I");
+  tdesc_add_flag (type, 8, "A");
+  tdesc_add_flag (type, 9, "D");
+  tdesc_add_flag (type, 20, "IL");
+  tdesc_add_flag (type, 21, "SS");
+  tdesc_add_flag (type, 28, "V");
+  tdesc_add_flag (type, 29, "C");
+  tdesc_add_flag (type, 30, "Z");
+  tdesc_add_flag (type, 31, "N");
+
+  tdesc_create_reg (feature, "x0", regnum++, 1, NULL, 64, "int");
+  tdesc_create_reg (feature, "x1", regnum++, 1, NULL, 64, "int");
+  tdesc_create_reg (feature, "x2", regnum++, 1, NULL, 64, "int");
+  tdesc_create_reg (feature, "x3", regnum++, 1, NULL, 64, "int");
+  tdesc_create_reg (feature, "x4", regnum++, 1, NULL, 64, "int");
+  tdesc_create_reg (feature, "x5", regnum++, 1, NULL, 64, "int");
+  tdesc_create_reg (feature, "x6", regnum++, 1, NULL, 64, "int");
+  tdesc_create_reg (feature, "x7", regnum++, 1, NULL, 64, "int");
+  tdesc_create_reg (feature, "x8", regnum++, 1, NULL, 64, "int");
+  tdesc_create_reg (feature, "x9", regnum++, 1, NULL, 64, "int");
+  tdesc_create_reg (feature, "x10", regnum++, 1, NULL, 64, "int");
+  tdesc_create_reg (feature, "x11", regnum++, 1, NULL, 64, "int");
+  tdesc_create_reg (feature, "x12", regnum++, 1, NULL, 64, "int");
+  tdesc_create_reg (feature, "x13", regnum++, 1, NULL, 64, "int");
+  tdesc_create_reg (feature, "x14", regnum++, 1, NULL, 64, "int");
+  tdesc_create_reg (feature, "x15", regnum++, 1, NULL, 64, "int");
+  tdesc_create_reg (feature, "x16", regnum++, 1, NULL, 64, "int");
+  tdesc_create_reg (feature, "x17", regnum++, 1, NULL, 64, "int");
+  tdesc_create_reg (feature, "x18", regnum++, 1, NULL, 64, "int");
+  tdesc_create_reg (feature, "x19", regnum++, 1, NULL, 64, "int");
+  tdesc_create_reg (feature, "x20", regnum++, 1, NULL, 64, "int");
+  tdesc_create_reg (feature, "x21", regnum++, 1, NULL, 64, "int");
+  tdesc_create_reg (feature, "x22", regnum++, 1, NULL, 64, "int");
+  tdesc_create_reg (feature, "x23", regnum++, 1, NULL, 64, "int");
+  tdesc_create_reg (feature, "x24", regnum++, 1, NULL, 64, "int");
+  tdesc_create_reg (feature, "x25", regnum++, 1, NULL, 64, "int");
+  tdesc_create_reg (feature, "x26", regnum++, 1, NULL, 64, "int");
+  tdesc_create_reg (feature, "x27", regnum++, 1, NULL, 64, "int");
+  tdesc_create_reg (feature, "x28", regnum++, 1, NULL, 64, "int");
+  tdesc_create_reg (feature, "x29", regnum++, 1, NULL, 64, "int");
+  tdesc_create_reg (feature, "x30", regnum++, 1, NULL, 64, "int");
+  tdesc_create_reg (feature, "sp", regnum++, 1, NULL, 64, "data_ptr");
+  tdesc_create_reg (feature, "pc", regnum++, 1, NULL, 64, "code_ptr");
+  tdesc_create_reg (feature, "cpsr", regnum++, 1, NULL, 32, "cpsr_flags");
+  return regnum;
+}
diff --git a/gdb/features/aarch64-fpu.c b/gdb/features/aarch64-fpu.c
new file mode 100644
index 0000000000000000000000000000000000000000..db3dfe771531f7a4c6aa09ee51053fa0266e8c2a
--- /dev/null
+++ b/gdb/features/aarch64-fpu.c
@@ -0,0 +1,138 @@
+/* THIS FILE IS GENERATED.  -*- buffer-read-only: t -*- vi:set ro:
+  Original: aarch64-fpu.xml.tmp */
+
+#ifdef GDBSERVER
+#include "tdesc.h"
+#else
+#include "defs.h"
+#include "osabi.h"
+#include "target-descriptions.h"
+#endif
+
+static int
+create_feature_aarch64_fpu (struct target_desc *result, long regnum)
+{
+  struct tdesc_feature *feature;
+
+  feature = tdesc_create_feature (result, "org.gnu.gdb.aarch64.fpu", "aarch64-fpu.xml");
+  struct tdesc_type *field_type;
+  field_type = tdesc_named_type (feature, "ieee_double");
+  tdesc_create_vector (feature, "v2d", field_type, 2);
+
+  field_type = tdesc_named_type (feature, "uint64");
+  tdesc_create_vector (feature, "v2u", field_type, 2);
+
+  field_type = tdesc_named_type (feature, "int64");
+  tdesc_create_vector (feature, "v2i", field_type, 2);
+
+  field_type = tdesc_named_type (feature, "ieee_single");
+  tdesc_create_vector (feature, "v4f", field_type, 4);
+
+  field_type = tdesc_named_type (feature, "uint32");
+  tdesc_create_vector (feature, "v4u", field_type, 4);
+
+  field_type = tdesc_named_type (feature, "int32");
+  tdesc_create_vector (feature, "v4i", field_type, 4);
+
+  field_type = tdesc_named_type (feature, "uint16");
+  tdesc_create_vector (feature, "v8u", field_type, 8);
+
+  field_type = tdesc_named_type (feature, "int16");
+  tdesc_create_vector (feature, "v8i", field_type, 8);
+
+  field_type = tdesc_named_type (feature, "uint8");
+  tdesc_create_vector (feature, "v16u", field_type, 16);
+
+  field_type = tdesc_named_type (feature, "int8");
+  tdesc_create_vector (feature, "v16i", field_type, 16);
+
+  field_type = tdesc_named_type (feature, "uint128");
+  tdesc_create_vector (feature, "v1u", field_type, 1);
+
+  field_type = tdesc_named_type (feature, "int128");
+  tdesc_create_vector (feature, "v1i", field_type, 1);
+
+  struct tdesc_type *type;
+  type = tdesc_create_union (feature, "vnd");
+  field_type = tdesc_named_type (feature, "v2d");
+  tdesc_add_field (type, "f", field_type);
+  field_type = tdesc_named_type (feature, "v2u");
+  tdesc_add_field (type, "u", field_type);
+  field_type = tdesc_named_type (feature, "v2i");
+  tdesc_add_field (type, "s", field_type);
+
+  type = tdesc_create_union (feature, "vns");
+  field_type = tdesc_named_type (feature, "v4f");
+  tdesc_add_field (type, "f", field_type);
+  field_type = tdesc_named_type (feature, "v4u");
+  tdesc_add_field (type, "u", field_type);
+  field_type = tdesc_named_type (feature, "v4i");
+  tdesc_add_field (type, "s", field_type);
+
+  type = tdesc_create_union (feature, "vnh");
+  field_type = tdesc_named_type (feature, "v8u");
+  tdesc_add_field (type, "u", field_type);
+  field_type = tdesc_named_type (feature, "v8i");
+  tdesc_add_field (type, "s", field_type);
+
+  type = tdesc_create_union (feature, "vnb");
+  field_type = tdesc_named_type (feature, "v16u");
+  tdesc_add_field (type, "u", field_type);
+  field_type = tdesc_named_type (feature, "v16i");
+  tdesc_add_field (type, "s", field_type);
+
+  type = tdesc_create_union (feature, "vnq");
+  field_type = tdesc_named_type (feature, "v1u");
+  tdesc_add_field (type, "u", field_type);
+  field_type = tdesc_named_type (feature, "v1i");
+  tdesc_add_field (type, "s", field_type);
+
+  type = tdesc_create_union (feature, "aarch64v");
+  field_type = tdesc_named_type (feature, "vnd");
+  tdesc_add_field (type, "d", field_type);
+  field_type = tdesc_named_type (feature, "vns");
+  tdesc_add_field (type, "s", field_type);
+  field_type = tdesc_named_type (feature, "vnh");
+  tdesc_add_field (type, "h", field_type);
+  field_type = tdesc_named_type (feature, "vnb");
+  tdesc_add_field (type, "b", field_type);
+  field_type = tdesc_named_type (feature, "vnq");
+  tdesc_add_field (type, "q", field_type);
+
+  regnum = 34;
+  tdesc_create_reg (feature, "v0", regnum++, 1, NULL, 128, "aarch64v");
+  tdesc_create_reg (feature, "v1", regnum++, 1, NULL, 128, "aarch64v");
+  tdesc_create_reg (feature, "v2", regnum++, 1, NULL, 128, "aarch64v");
+  tdesc_create_reg (feature, "v3", regnum++, 1, NULL, 128, "aarch64v");
+  tdesc_create_reg (feature, "v4", regnum++, 1, NULL, 128, "aarch64v");
+  tdesc_create_reg (feature, "v5", regnum++, 1, NULL, 128, "aarch64v");
+  tdesc_create_reg (feature, "v6", regnum++, 1, NULL, 128, "aarch64v");
+  tdesc_create_reg (feature, "v7", regnum++, 1, NULL, 128, "aarch64v");
+  tdesc_create_reg (feature, "v8", regnum++, 1, NULL, 128, "aarch64v");
+  tdesc_create_reg (feature, "v9", regnum++, 1, NULL, 128, "aarch64v");
+  tdesc_create_reg (feature, "v10", regnum++, 1, NULL, 128, "aarch64v");
+  tdesc_create_reg (feature, "v11", regnum++, 1, NULL, 128, "aarch64v");
+  tdesc_create_reg (feature, "v12", regnum++, 1, NULL, 128, "aarch64v");
+  tdesc_create_reg (feature, "v13", regnum++, 1, NULL, 128, "aarch64v");
+  tdesc_create_reg (feature, "v14", regnum++, 1, NULL, 128, "aarch64v");
+  tdesc_create_reg (feature, "v15", regnum++, 1, NULL, 128, "aarch64v");
+  tdesc_create_reg (feature, "v16", regnum++, 1, NULL, 128, "aarch64v");
+  tdesc_create_reg (feature, "v17", regnum++, 1, NULL, 128, "aarch64v");
+  tdesc_create_reg (feature, "v18", regnum++, 1, NULL, 128, "aarch64v");
+  tdesc_create_reg (feature, "v19", regnum++, 1, NULL, 128, "aarch64v");
+  tdesc_create_reg (feature, "v20", regnum++, 1, NULL, 128, "aarch64v");
+  tdesc_create_reg (feature, "v21", regnum++, 1, NULL, 128, "aarch64v");
+  tdesc_create_reg (feature, "v22", regnum++, 1, NULL, 128, "aarch64v");
+  tdesc_create_reg (feature, "v23", regnum++, 1, NULL, 128, "aarch64v");
+  tdesc_create_reg (feature, "v24", regnum++, 1, NULL, 128, "aarch64v");
+  tdesc_create_reg (feature, "v25", regnum++, 1, NULL, 128, "aarch64v");
+  tdesc_create_reg (feature, "v26", regnum++, 1, NULL, 128, "aarch64v");
+  tdesc_create_reg (feature, "v27", regnum++, 1, NULL, 128, "aarch64v");
+  tdesc_create_reg (feature, "v28", regnum++, 1, NULL, 128, "aarch64v");
+  tdesc_create_reg (feature, "v29", regnum++, 1, NULL, 128, "aarch64v");
+  tdesc_create_reg (feature, "v30", regnum++, 1, NULL, 128, "aarch64v");
+  tdesc_create_reg (feature, "v31", regnum++, 1, NULL, 128, "aarch64v");
+  tdesc_create_reg (feature, "fpsr", regnum++, 1, NULL, 32, "int");
+  tdesc_create_reg (feature, "fpcr", regnum++, 1, NULL, 32, "int");
+  return regnum;
+}
diff --git a/gdb/gdbserver/linux-aarch64-ipa.c b/gdb/gdbserver/linux-aarch64-ipa.c
index 28dc9776a1c8d273e8bc749296a57bc62b8619d5..b240100a13eccdfa696937158dbb365dcff12730 100644
--- a/gdb/gdbserver/linux-aarch64-ipa.c
+++ b/gdb/gdbserver/linux-aarch64-ipa.c
@@ -27,9 +27,6 @@
 #endif
 #include "linux-aarch64-tdesc.h"

-/* Defined in auto-generated file aarch64.c.  */
-void init_registers_aarch64 (void);
-
 /* Each register saved by the jump pad is in a 16 byte cell.  */
 #define FT_CR_SIZE 16

@@ -207,5 +204,4 @@ alloc_jump_pad_buffer (size_t size)
 void
 initialize_low_tracepoint (void)
 {
-  init_registers_aarch64 ();
 }
diff --git a/gdb/gdbserver/linux-aarch64-low.c b/gdb/gdbserver/linux-aarch64-low.c
index dcce287974cb6afd2f530ce1257dbbf25ed25ddc..9682537728847850d824c7eac949c68ab09226ac 100644
--- a/gdb/gdbserver/linux-aarch64-low.c
+++ b/gdb/gdbserver/linux-aarch64-low.c
@@ -41,9 +41,6 @@
 #include "arch/aarch64.h"
 #include "linux-aarch64-tdesc.h"

-/* Defined in auto-generated files.  */
-void init_registers_aarch64 (void);
-
 #ifdef HAVE_SYS_REG_H
 #include <sys/reg.h>
 #endif
@@ -2998,8 +2995,6 @@ struct linux_target_ops the_low_target =
 void
 initialize_low_arch (void)
 {
-  init_registers_aarch64 ();
-
   initialize_low_arch_aarch32 ();

   initialize_regsets_info (&aarch64_regsets_info);
diff --git a/gdb/gdbserver/linux-aarch64-tdesc.c b/gdb/gdbserver/linux-aarch64-tdesc.c
index 4148ed70c4ca973652e860492cd7cc1a249991d8..4a984caa8c0493cb65480c9988b3997dec95730b 100644
--- a/gdb/gdbserver/linux-aarch64-tdesc.c
+++ b/gdb/gdbserver/linux-aarch64-tdesc.c
@@ -35,6 +35,13 @@ aarch64_linux_read_description ()
   if (*tdesc == NULL)
     {
       *tdesc = aarch64_create_target_description ();
+
+      init_target_desc (*tdesc);
+
+#ifndef IN_PROCESS_AGENT
+      static const char *expedite_regs_aarch64[] = { "x29", "sp", "pc", NULL };
+      (*tdesc)->expedite_regs = expedite_regs_aarch64;
+#endif
     }

   return *tdesc;
diff --git a/gdb/target-descriptions.c b/gdb/target-descriptions.c
index 4f5e9d60a6d98b5855d6ee4ffeaa9fd7149d6395..cb6e4e7c9055795eef9777c7226bd53975610340 100644
--- a/gdb/target-descriptions.c
+++ b/gdb/target-descriptions.c
@@ -2327,7 +2327,8 @@ maint_print_c_tdesc_cmd (const char *args, int from_tty)
      counterparts.  */
   if (startswith (filename_after_features.c_str (), "i386/32bit-")
       || startswith (filename_after_features.c_str (), "i386/64bit-")
-      || startswith (filename_after_features.c_str (), "i386/x32-core.xml"))
+      || startswith (filename_after_features.c_str (), "i386/x32-core.xml")
+      || startswith (filename_after_features.c_str (), "aarch64"))
     {
       print_c_feature v (filename_after_features);