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diff --git a/arch/tile/include/arch/abi.h b/arch/tile/include/arch/abi.h
new file mode 100644
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+++ b/arch/tile/include/arch/abi.h
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+// Copyright 2010 Tilera Corporation. All Rights Reserved.
+//
+//   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, version 2.
+//
+//   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, GOOD TITLE or
+//   NON INFRINGEMENT.  See the GNU General Public License for
+//   more details.
+
+//! @file
+//!
+//! ABI-related register definitions helpful when writing assembly code.
+//!
+
+#ifndef __ARCH_ABI_H__
+#define __ARCH_ABI_H__
+
+#include <arch/chip.h>
+
+// Registers 0 - 55 are "normal", but some perform special roles.
+
+#define TREG_FP       52   /**< Frame pointer. */
+#define TREG_TP       53   /**< Thread pointer. */
+#define TREG_SP       54   /**< Stack pointer. */
+#define TREG_LR       55   /**< Link to calling function PC. */
+
+/** Index of last normal general-purpose register. */
+#define TREG_LAST_GPR 55
+
+// Registers 56 - 62 are "special" network registers.
+
+#define TREG_SN       56   /**< Static network access. */
+#define TREG_IDN0     57   /**< IDN demux 0 access. */
+#define TREG_IDN1     58   /**< IDN demux 1 access. */
+#define TREG_UDN0     59   /**< UDN demux 0 access. */
+#define TREG_UDN1     60   /**< UDN demux 1 access. */
+#define TREG_UDN2     61   /**< UDN demux 2 access. */
+#define TREG_UDN3     62   /**< UDN demux 3 access. */
+
+// Register 63 is the "special" zero register.
+
+#define TREG_ZERO     63   /**< "Zero" register; always reads as "0". */
+
+
+/** By convention, this register is used to hold the syscall number. */
+#define TREG_SYSCALL_NR      10
+
+/** Name of register that holds the syscall number, for use in assembly. */
+#define TREG_SYSCALL_NR_NAME r10
+
+
+//! The ABI requires callers to allocate a caller state save area of
+//! this many bytes at the bottom of each stack frame.
+//!
+#ifdef __tile__
+#define C_ABI_SAVE_AREA_SIZE (2 * __SIZEOF_POINTER__)
+#endif
+
+//! The operand to an 'info' opcode directing the backtracer to not
+//! try to find the calling frame.
+//!
+#define INFO_OP_CANNOT_BACKTRACE 2
+
+#ifndef __ASSEMBLER__
+#if CHIP_WORD_SIZE() > 32
+
+//! Unsigned type that can hold a register.
+typedef unsigned long long uint_reg_t;
+
+//! Signed type that can hold a register.
+typedef long long int_reg_t;
+
+//! String prefix to use for printf().
+#define INT_REG_FMT "ll"
+
+#elif !defined(__LP64__)   /* avoid confusion with LP64 cross-build tools */
+
+//! Unsigned type that can hold a register.
+typedef unsigned long uint_reg_t;
+
+//! Signed type that can hold a register.
+typedef long int_reg_t;
+
+//! String prefix to use for printf().
+#define INT_REG_FMT "l"
+
+#endif
+#endif /* __ASSEMBLER__ */
+
+#endif // !__ARCH_ABI_H__