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diff --git a/gdb/tilegx-tdep.h b/gdb/tilegx-tdep.h
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+/* Target-dependent code for the Tilera TILE-Gx processor.
+
+   Copyright (C) 2012 Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#ifndef TILEGX_TDEP_H
+#define TILEGX_TDEP_H
+
+/* TILE-Gx has 56 general purpose registers (R0 - R52, TP, SP, LR),
+   plus 8 special general purpose registers (network and ZERO),
+   plus 1 magic register (PC).
+
+   TP (aka R53) is the thread specific data pointer.
+   SP (aka R54) is the stack pointer.
+   LR (aka R55) is the link register.  */
+
+enum tilegx_regnum
+  {
+    TILEGX_R0_REGNUM,
+    TILEGX_R1_REGNUM,
+    TILEGX_R2_REGNUM,
+    TILEGX_R3_REGNUM,
+    TILEGX_R4_REGNUM,
+    TILEGX_R5_REGNUM,
+    TILEGX_R6_REGNUM,
+    TILEGX_R7_REGNUM,
+    TILEGX_R8_REGNUM,
+    TILEGX_R9_REGNUM,
+    TILEGX_R10_REGNUM,
+    TILEGX_R11_REGNUM,
+    TILEGX_R12_REGNUM,
+    TILEGX_R13_REGNUM,
+    TILEGX_R14_REGNUM,
+    TILEGX_R15_REGNUM,
+    TILEGX_R16_REGNUM,
+    TILEGX_R17_REGNUM,
+    TILEGX_R18_REGNUM,
+    TILEGX_R19_REGNUM,
+    TILEGX_R20_REGNUM,
+    TILEGX_R21_REGNUM,
+    TILEGX_R22_REGNUM,
+    TILEGX_R23_REGNUM,
+    TILEGX_R24_REGNUM,
+    TILEGX_R25_REGNUM,
+    TILEGX_R26_REGNUM,
+    TILEGX_R27_REGNUM,
+    TILEGX_R28_REGNUM,
+    TILEGX_R29_REGNUM,
+    TILEGX_R30_REGNUM,
+    TILEGX_R31_REGNUM,
+    TILEGX_R32_REGNUM,
+    TILEGX_R33_REGNUM,
+    TILEGX_R34_REGNUM,
+    TILEGX_R35_REGNUM,
+    TILEGX_R36_REGNUM,
+    TILEGX_R37_REGNUM,
+    TILEGX_R38_REGNUM,
+    TILEGX_R39_REGNUM,
+    TILEGX_R40_REGNUM,
+    TILEGX_R41_REGNUM,
+    TILEGX_R42_REGNUM,
+    TILEGX_R43_REGNUM,
+    TILEGX_R44_REGNUM,
+    TILEGX_R45_REGNUM,
+    TILEGX_R46_REGNUM,
+    TILEGX_R47_REGNUM,
+    TILEGX_R48_REGNUM,
+    TILEGX_R49_REGNUM,
+    TILEGX_R50_REGNUM,
+    TILEGX_R51_REGNUM,
+    TILEGX_R52_REGNUM,
+    TILEGX_TP_REGNUM,
+    TILEGX_SP_REGNUM,
+    TILEGX_LR_REGNUM,
+
+    TILEGX_SN_REGNUM,
+    TILEGX_NUM_EASY_REGS = TILEGX_SN_REGNUM, /* 56 */
+
+    TILEGX_IO0_REGNUM,
+    TILEGX_IO1_REGNUM,
+    TILEGX_US0_REGNUM,
+    TILEGX_US1_REGNUM,
+    TILEGX_US2_REGNUM,
+    TILEGX_US3_REGNUM,
+    TILEGX_ZERO_REGNUM,
+
+    TILEGX_PC_REGNUM,
+    TILEGX_NUM_PHYS_REGS = TILEGX_PC_REGNUM, /* 64 */
+
+    TILEGX_NUM_REGS /* 65 */
+  };
+
+enum { tilegx_reg_size = 8 };
+
+#endif /* tilegx-tdep.h */