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 #ifndef __tile__   /* support uncommon use of arch headers in non-tile builds */
  24 # include <arch/chip.h>
  25 # define __INT_REG_BITS CHIP_WORD_SIZE()
  26 #endif
  27
  28 #include <arch/intreg.h>
  29
  30 /* __need_int_reg_t is deprecated: just include <arch/intreg.h> */
  31 #ifndef __need_int_reg_t
  32
  33 #define __ARCH_ABI_H__
  34
  35 #ifndef __ASSEMBLER__
  36 /** Unsigned type that can hold a register. */
  37 typedef __uint_reg_t uint_reg_t;
  38
  39 /** Signed type that can hold a register. */
  40 typedef __int_reg_t int_reg_t;
  41 #endif
  42
  43 /** String prefix to use for printf(). */
  44 #define INT_REG_FMT __INT_REG_FMT
  45
  46 /** Number of bits in a register. */
  47 #define INT_REG_BITS __INT_REG_BITS
  48
  49
  50 /* Registers 0 - 55 are "normal", but some perform special roles. */
  51
  52 #define TREG_FP       52   /**< Frame pointer. */
  53 #define TREG_TP       53   /**< Thread pointer. */
  54 #define TREG_SP       54   /**< Stack pointer. */
  55 #define TREG_LR       55   /**< Link to calling function PC. */
  56
  57 /** Index of last normal general-purpose register. */
  58 #define TREG_LAST_GPR 55
  59
  60 /* Registers 56 - 62 are "special" network registers. */
  61
  62 #define TREG_SN       56   /**< Static network access. */
  63 #define TREG_IDN0     57   /**< IDN demux 0 access. */
  64 #define TREG_IDN1     58   /**< IDN demux 1 access. */
  65 #define TREG_UDN0     59   /**< UDN demux 0 access. */
  66 #define TREG_UDN1     60   /**< UDN demux 1 access. */
  67 #define TREG_UDN2     61   /**< UDN demux 2 access. */
  68 #define TREG_UDN3     62   /**< UDN demux 3 access. */
  69
  70 /* Register 63 is the "special" zero register. */
  71
  72 #define TREG_ZERO     63   /**< "Zero" register; always reads as "0". */
  73
  74
  75 /** By convention, this register is used to hold the syscall number. */
  76 #define TREG_SYSCALL_NR      10
  77
  78 /** Name of register that holds the syscall number, for use in assembly. */
  79 #define TREG_SYSCALL_NR_NAME r10
  80
  81
  82 /**
  83  * The ABI requires callers to allocate a caller state save area of
  84  * this many bytes at the bottom of each stack frame.
  85  */
  86 #define C_ABI_SAVE_AREA_SIZE (2 * (INT_REG_BITS / 8))
  87
  88 /**
  89  * The operand to an 'info' opcode directing the backtracer to not
  90  * try to find the calling frame.
  91  */
  92 #define INFO_OP_CANNOT_BACKTRACE 2
  93
  94
  95 #endif /* !__need_int_reg_t */
  96
  97 /* Make sure we later can get all the definitions and declarations.  */
  98 #undef __need_int_reg_t
  99
 100 #endif /* !__ARCH_ABI_H__ */