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[RFC/TileGX 5/6]show registers in columns


tilegx has 64 registers, to show them in row will be not very convinent to explore,
so we improve this by showing them in columns.


(gdb) info registers
r0 0x0000000000000001 r19 0x0000000000000000 r38 0x0000000000000040
r1 0x000001ffffc7f458 r20 0x000001ffffc7f278 r39 0x0000000000000000
r2 0x000001ffffc7f468 r21 0x000001ffffc7f298 r40 0x000000000015b3e8
r3 0x0000000000010720 r22 0x000001ffffc7f280 r41 0x000000000015882c
...
...


gdb/ChangeLog:

       * tilegx-tdep.c (tilegx_print_registers_info): New function.
       show registers in columns.

please review.

---
Regards,
Jiong
Tilera Corporation.

---
 gdb/tilegx-tdep.c |   63 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 63 insertions(+)

diff --git a/gdb/tilegx-tdep.c b/gdb/tilegx-tdep.c
index 7f36bed..c19bdf9 100644
--- a/gdb/tilegx-tdep.c
+++ b/gdb/tilegx-tdep.c
@@ -940,6 +940,66 @@ tilegx_cannot_reference_register (struct gdbarch *gdbarch, int regno)
     return 1;
 }
 
+
+/* Tilera private register printer.  */
+#define MAX_COLUMNS 3
+static void
+tilegx_print_registers_info (struct gdbarch *gdbarch, struct ui_file *file,
+                             struct frame_info *frame,
+                             int regnum, int print_all)
+{
+  int i;
+  int j;
+  int k;
+  gdb_byte buffer[MAX_REGISTER_SIZE];
+
+  if (regnum != -1)
+    {
+      default_print_registers_info (gdbarch, file, frame, regnum, print_all);
+      return;
+    }
+
+  for (i = 0; i < TILEGX_NUM_EASY_REGS / MAX_COLUMNS + 1; ++i)
+    {
+      for (j = i;
+           j < TILEGX_NUM_EASY_REGS + 1;
+           j += TILEGX_NUM_EASY_REGS / MAX_COLUMNS + 1)
+        {
+	  /* Some registers are never available. Skip them and print PC.  */
+	  if (j > TILEGX_LR_REGNUM)
+	    j = TILEGX_PC_REGNUM;
+
+	  if (j > i)
+	    fprintf_filtered (file, "    ");
+
+	  fputs_filtered (gdbarch_register_name (gdbarch, j), file);
+	  print_spaces_filtered (5 - strlen (gdbarch_register_name
+					     (gdbarch, j)), file);
+
+	  /* Get the data in raw format.  */
+	  if (! deprecated_frame_register_read (frame, j, buffer))
+	    {
+	      fprintf_filtered (file, " *** no value *** ");
+	    }
+	  else
+	    {
+	      fprintf_filtered (file, "0x");
+	      for (k = 0; k < tilegx_reg_size; k++)
+		{
+		  int idx;
+		  if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG)
+		    idx = k;
+		  else
+		    idx = tilegx_reg_size - 1 - k;
+		  fprintf_filtered (file, "%02x", (unsigned char) buffer[idx]);
+		}
+	    }
+        }
+
+      fprintf_filtered (file, "\n");
+    }
+}
+
 static struct gdbarch *
 tilegx_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
 {
@@ -1000,6 +1060,9 @@ tilegx_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
   /* Stack grows down.  */
   set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
 
+  /* Tilera private register printer */
+  set_gdbarch_print_registers_info (gdbarch, tilegx_print_registers_info);
+
   /* Frame Info.  */
   set_gdbarch_unwind_sp (gdbarch, tilegx_unwind_sp);
   set_gdbarch_unwind_pc (gdbarch, tilegx_unwind_pc);
-- 
1.7.10.3



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