release/src-rt-6.x.4708/linux/linux-2.6.36/arch/tile/include/arch/abi.h

   1 /*
   2  * Copyright 2010 Tilera Corporation. All Rights Reserved.
   3  *
   4  *   This program is free software; you can redistribute it and/or
   5  *   modify it under the terms of the GNU General Public License
   6  *   as published by the Free Software Foundation, version 2.
   7  *
   8  *   This program is distributed in the hope that it will be useful, but
   9  *   WITHOUT ANY WARRANTY; without even the implied warranty of
  10  *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  11  *   NON INFRINGEMENT.  See the GNU General Public License for
  12  *   more details.
  13  */
  14
  15 /**
  16  * @file
  17  *
  18  * ABI-related register definitions helpful when writing assembly code.
  19  */
  20
  21 #ifndef __ARCH_ABI_H__
  22 #define __ARCH_ABI_H__
  23
  24 #include <arch/chip.h>
  25
  26 /* Registers 0 - 55 are "normal", but some perform special roles. */
  27
  28 #define TREG_FP       52   /**< Frame pointer. */
  29 #define TREG_TP       53   /**< Thread pointer. */
  30 #define TREG_SP       54   /**< Stack pointer. */
  31 #define TREG_LR       55   /**< Link to calling function PC. */
  32
  33 /** Index of last normal general-purpose register. */
  34 #define TREG_LAST_GPR 55
  35
  36 /* Registers 56 - 62 are "special" network registers. */
  37
  38 #define TREG_SN       56   /**< Static network access. */
  39 #define TREG_IDN0     57   /**< IDN demux 0 access. */
  40 #define TREG_IDN1     58   /**< IDN demux 1 access. */
  41 #define TREG_UDN0     59   /**< UDN demux 0 access. */
  42 #define TREG_UDN1     60   /**< UDN demux 1 access. */
  43 #define TREG_UDN2     61   /**< UDN demux 2 access. */
  44 #define TREG_UDN3     62   /**< UDN demux 3 access. */
  45
  46 /* Register 63 is the "special" zero register. */
  47
  48 #define TREG_ZERO     63   /**< "Zero" register; always reads as "0". */
  49
  50
  51 /** By convention, this register is used to hold the syscall number. */
  52 #define TREG_SYSCALL_NR      10
  53
  54 /** Name of register that holds the syscall number, for use in assembly. */
  55 #define TREG_SYSCALL_NR_NAME r10
  56
  57
  58 /**
  59  * The ABI requires callers to allocate a caller state save area of
  60  * this many bytes at the bottom of each stack frame.
  61  */
  62 #define C_ABI_SAVE_AREA_SIZE (2 * (CHIP_WORD_SIZE() / 8))
  63
  64 /**
  65  * The operand to an 'info' opcode directing the backtracer to not
  66  * try to find the calling frame.
  67  */
  68 #define INFO_OP_CANNOT_BACKTRACE 2
  69
  70 #ifndef __ASSEMBLER__
  71 #if CHIP_WORD_SIZE() > 32
  72
  73 /** Unsigned type that can hold a register. */
  74 typedef unsigned long long uint_reg_t;
  75
  76 /** Signed type that can hold a register. */
  77 typedef long long int_reg_t;
  78
  79 /** String prefix to use for printf(). */
  80 #define INT_REG_FMT "ll"
  81
  82 #elif !defined(__LP64__)     /* avoid confusion with LP64 cross-build tools */
  83
  84 /** Unsigned type that can hold a register. */
  85 typedef unsigned long uint_reg_t;
  86
  87 /** Signed type that can hold a register. */
  88 typedef long int_reg_t;
  89
  90 /** String prefix to use for printf(). */
  91 #define INT_REG_FMT "l"
  92
  93 #endif
  94 #endif /* __ASSEMBLER__ */
  95
  96 #endif /* !__ARCH_ABI_H__ */