arch/tile/include/uapi/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.
  19  */
  20
  21 #ifndef __ARCH_ABI_H__
  22
  23 #if !defined __need_int_reg_t && !defined __DOXYGEN__
  24 # define __ARCH_ABI_H__
  25 # include <arch/chip.h>
  26 #endif
  27
  28 /* Provide the basic machine types. */
  29 #ifndef __INT_REG_BITS
  30
  31 /** Number of bits in a register. */
  32 #if defined __tilegx__
  33 # define __INT_REG_BITS 64
  34 #elif defined __tilepro__
  35 # define __INT_REG_BITS 32
  36 #elif !defined __need_int_reg_t
  37 # include <arch/chip.h>
  38 # define __INT_REG_BITS CHIP_WORD_SIZE()
  39 #else
  40 # error Unrecognized architecture with __need_int_reg_t
  41 #endif
  42
  43 #if __INT_REG_BITS == 64
  44
  45 #ifndef __ASSEMBLER__
  46 /** Unsigned type that can hold a register. */
  47 typedef unsigned long long __uint_reg_t;
  48
  49 /** Signed type that can hold a register. */
  50 typedef long long __int_reg_t;
  51 #endif
  52
  53 /** String prefix to use for printf(). */
  54 #define __INT_REG_FMT "ll"
  55
  56 #else
  57
  58 #ifndef __ASSEMBLER__
  59 /** Unsigned type that can hold a register. */
  60 typedef unsigned long __uint_reg_t;
  61
  62 /** Signed type that can hold a register. */
  63 typedef long __int_reg_t;
  64 #endif
  65
  66 /** String prefix to use for printf(). */
  67 #define __INT_REG_FMT "l"
  68
  69 #endif
  70 #endif /* __INT_REG_BITS */
  71
  72
  73 #ifndef __need_int_reg_t
  74
  75
  76 #ifndef __ASSEMBLER__
  77 /** Unsigned type that can hold a register. */
  78 typedef __uint_reg_t uint_reg_t;
  79
  80 /** Signed type that can hold a register. */
  81 typedef __int_reg_t int_reg_t;
  82 #endif
  83
  84 /** String prefix to use for printf(). */
  85 #define INT_REG_FMT __INT_REG_FMT
  86
  87 /** Number of bits in a register. */
  88 #define INT_REG_BITS __INT_REG_BITS
  89
  90
  91 /* Registers 0 - 55 are "normal", but some perform special roles. */
  92
  93 #define TREG_FP       52   /**< Frame pointer. */
  94 #define TREG_TP       53   /**< Thread pointer. */
  95 #define TREG_SP       54   /**< Stack pointer. */
  96 #define TREG_LR       55   /**< Link to calling function PC. */
  97
  98 /** Index of last normal general-purpose register. */
  99 #define TREG_LAST_GPR 55
 100
 101 /* Registers 56 - 62 are "special" network registers. */
 102
 103 #define TREG_SN       56   /**< Static network access. */
 104 #define TREG_IDN0     57   /**< IDN demux 0 access. */
 105 #define TREG_IDN1     58   /**< IDN demux 1 access. */
 106 #define TREG_UDN0     59   /**< UDN demux 0 access. */
 107 #define TREG_UDN1     60   /**< UDN demux 1 access. */
 108 #define TREG_UDN2     61   /**< UDN demux 2 access. */
 109 #define TREG_UDN3     62   /**< UDN demux 3 access. */
 110
 111 /* Register 63 is the "special" zero register. */
 112
 113 #define TREG_ZERO     63   /**< "Zero" register; always reads as "0". */
 114
 115
 116 /** By convention, this register is used to hold the syscall number. */
 117 #define TREG_SYSCALL_NR      10
 118
 119 /** Name of register that holds the syscall number, for use in assembly. */
 120 #define TREG_SYSCALL_NR_NAME r10
 121
 122
 123 /**
 124  * The ABI requires callers to allocate a caller state save area of
 125  * this many bytes at the bottom of each stack frame.
 126  */
 127 #define C_ABI_SAVE_AREA_SIZE (2 * (INT_REG_BITS / 8))
 128
 129 /**
 130  * The operand to an 'info' opcode directing the backtracer to not
 131  * try to find the calling frame.
 132  */
 133 #define INFO_OP_CANNOT_BACKTRACE 2
 134
 135
 136 #endif /* !__need_int_reg_t */
 137
 138 /* Make sure we later can get all the definitions and declarations.  */
 139 #undef __need_int_reg_t
 140
 141 #endif /* !__ARCH_ABI_H__ */