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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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