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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__
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