1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Copyright 2006, Bernhard Reutner-Fischer
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4 | *
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5 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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6 | */
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7 | #ifndef BB_PLATFORM_H
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8 | #define BB_PLATFORM_H 1
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9 |
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10 | /* Assume all these functions exist by default. Platforms where it is not
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11 | * true will #undef them below.
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12 | */
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13 | #define HAVE_FDPRINTF 1
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14 | #define HAVE_MEMRCHR 1
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15 | #define HAVE_MKDTEMP 1
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16 | #define HAVE_SETBIT 1
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17 | #define HAVE_STRCASESTR 1
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18 | #define HAVE_STRCHRNUL 1
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19 | #define HAVE_STRSEP 1
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20 | #define HAVE_STRSIGNAL 1
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21 | #define HAVE_VASPRINTF 1
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22 |
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23 | /* Convenience macros to test the version of gcc. */
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24 | #undef __GNUC_PREREQ
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25 | #if defined __GNUC__ && defined __GNUC_MINOR__
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26 | # define __GNUC_PREREQ(maj, min) \
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27 | ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
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28 | #else
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29 | # define __GNUC_PREREQ(maj, min) 0
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30 | #endif
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31 |
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32 | /* __restrict is known in EGCS 1.2 and above. */
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33 | #if !__GNUC_PREREQ(2,92)
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34 | # ifndef __restrict
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35 | # define __restrict
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36 | # endif
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37 | #endif
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38 |
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39 | /* Define macros for some gcc attributes. This permits us to use the
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40 | macros freely, and know that they will come into play for the
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41 | version of gcc in which they are supported. */
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42 |
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43 | #if !__GNUC_PREREQ(2,7)
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44 | # ifndef __attribute__
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45 | # define __attribute__(x)
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46 | # endif
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47 | #endif
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48 |
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49 | #undef inline
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50 | #if defined(__STDC_VERSION__) && __STDC_VERSION__ > 199901L
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51 | /* it's a keyword */
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52 | #elif __GNUC_PREREQ(2,7)
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53 | # define inline __inline__
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54 | #else
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55 | # define inline
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56 | #endif
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57 |
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58 | #ifndef __const
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59 | # define __const const
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60 | #endif
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61 |
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62 | #define UNUSED_PARAM __attribute__ ((__unused__))
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63 | #define NORETURN __attribute__ ((__noreturn__))
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64 | /* "The malloc attribute is used to tell the compiler that a function
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65 | * may be treated as if any non-NULL pointer it returns cannot alias
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66 | * any other pointer valid when the function returns. This will often
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67 | * improve optimization. Standard functions with this property include
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68 | * malloc and calloc. realloc-like functions have this property as long
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69 | * as the old pointer is never referred to (including comparing it
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70 | * to the new pointer) after the function returns a non-NULL value."
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71 | */
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72 | #define RETURNS_MALLOC __attribute__ ((malloc))
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73 | #define PACKED __attribute__ ((__packed__))
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74 | #define ALIGNED(m) __attribute__ ((__aligned__(m)))
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75 |
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76 | /* __NO_INLINE__: some gcc's do not honor inlining! :( */
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77 | #if __GNUC_PREREQ(3,0) && !defined(__NO_INLINE__)
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78 | # define ALWAYS_INLINE __attribute__ ((always_inline)) inline
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79 | /* I've seen a toolchain where I needed __noinline__ instead of noinline */
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80 | # define NOINLINE __attribute__((__noinline__))
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81 | # if !ENABLE_WERROR
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82 | # define DEPRECATED __attribute__ ((__deprecated__))
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83 | # define UNUSED_PARAM_RESULT __attribute__ ((warn_unused_result))
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84 | # else
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85 | # define DEPRECATED
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86 | # define UNUSED_PARAM_RESULT
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87 | # endif
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88 | #else
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89 | # define ALWAYS_INLINE inline
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90 | # define NOINLINE
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91 | # define DEPRECATED
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92 | # define UNUSED_PARAM_RESULT
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93 | #endif
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94 |
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95 | /* -fwhole-program makes all symbols local. The attribute externally_visible
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96 | forces a symbol global. */
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97 | #if __GNUC_PREREQ(4,1)
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98 | # define EXTERNALLY_VISIBLE __attribute__(( visibility("default") ))
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99 | //__attribute__ ((__externally_visible__))
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100 | #else
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101 | # define EXTERNALLY_VISIBLE
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102 | #endif
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103 |
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104 | /* At 4.4 gcc become much more anal about this, need to use "aliased" types */
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105 | #if __GNUC_PREREQ(4,4)
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106 | # define FIX_ALIASING __attribute__((__may_alias__))
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107 | #else
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108 | # define FIX_ALIASING
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109 | #endif
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110 |
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111 | /* We use __extension__ in some places to suppress -pedantic warnings
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112 | about GCC extensions. This feature didn't work properly before
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113 | gcc 2.8. */
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114 | #if !__GNUC_PREREQ(2,8)
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115 | # ifndef __extension__
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116 | # define __extension__
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117 | # endif
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118 | #endif
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119 |
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120 | /* gcc-2.95 had no va_copy but only __va_copy. */
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121 | #if !__GNUC_PREREQ(3,0)
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122 | # include <stdarg.h>
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123 | # if !defined va_copy && defined __va_copy
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124 | # define va_copy(d,s) __va_copy((d),(s))
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125 | # endif
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126 | #endif
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127 |
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128 | /* FAST_FUNC is a qualifier which (possibly) makes function call faster
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129 | * and/or smaller by using modified ABI. It is usually only needed
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130 | * on non-static, busybox internal functions. Recent versions of gcc
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131 | * optimize statics automatically. FAST_FUNC on static is required
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132 | * only if you need to match a function pointer's type */
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133 | #if __GNUC_PREREQ(3,0) && defined(i386) /* || defined(__x86_64__)? */
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134 | /* stdcall makes callee to pop arguments from stack, not caller */
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135 | # define FAST_FUNC __attribute__((regparm(3),stdcall))
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136 | /* #elif ... - add your favorite arch today! */
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137 | #else
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138 | # define FAST_FUNC
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139 | #endif
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140 |
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141 | /* Make all declarations hidden (-fvisibility flag only affects definitions) */
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142 | /* (don't include system headers after this until corresponding pop!) */
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143 | #if __GNUC_PREREQ(4,1)
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144 | # define PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN _Pragma("GCC visibility push(hidden)")
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145 | # define POP_SAVED_FUNCTION_VISIBILITY _Pragma("GCC visibility pop")
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146 | #else
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147 | # define PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN
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148 | # define POP_SAVED_FUNCTION_VISIBILITY
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149 | #endif
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150 |
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151 | /* ---- Endian Detection ------------------------------------ */
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152 |
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153 | #include <limits.h>
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154 | #if defined(__digital__) && defined(__unix__)
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155 | # include <sex.h>
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156 | #elif defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) \
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157 | || defined(__APPLE__)
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158 | # include <sys/resource.h> /* rlimit */
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159 | # include <machine/endian.h>
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160 | # define bswap_64 __bswap64
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161 | # define bswap_32 __bswap32
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162 | # define bswap_16 __bswap16
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163 | #else
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164 | # include <byteswap.h>
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165 | # include <endian.h>
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166 | #endif
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167 |
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168 | #if defined(__BYTE_ORDER) && __BYTE_ORDER == __BIG_ENDIAN
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169 | # define BB_BIG_ENDIAN 1
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170 | # define BB_LITTLE_ENDIAN 0
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171 | #elif defined(__BYTE_ORDER) && __BYTE_ORDER == __LITTLE_ENDIAN
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172 | # define BB_BIG_ENDIAN 0
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173 | # define BB_LITTLE_ENDIAN 1
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174 | #elif defined(_BYTE_ORDER) && _BYTE_ORDER == _BIG_ENDIAN
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175 | # define BB_BIG_ENDIAN 1
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176 | # define BB_LITTLE_ENDIAN 0
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177 | #elif defined(_BYTE_ORDER) && _BYTE_ORDER == _LITTLE_ENDIAN
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178 | # define BB_BIG_ENDIAN 0
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179 | # define BB_LITTLE_ENDIAN 1
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180 | #elif defined(BYTE_ORDER) && BYTE_ORDER == BIG_ENDIAN
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181 | # define BB_BIG_ENDIAN 1
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182 | # define BB_LITTLE_ENDIAN 0
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183 | #elif defined(BYTE_ORDER) && BYTE_ORDER == LITTLE_ENDIAN
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184 | # define BB_BIG_ENDIAN 0
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185 | # define BB_LITTLE_ENDIAN 1
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186 | #elif defined(__386__)
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187 | # define BB_BIG_ENDIAN 0
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188 | # define BB_LITTLE_ENDIAN 1
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189 | #else
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190 | # error "Can't determine endianness"
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191 | #endif
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192 |
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193 | #if ULONG_MAX > 0xffffffff
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194 | # define bb_bswap_64(x) bswap_64(x)
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195 | #endif
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196 |
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197 | /* SWAP_LEnn means "convert CPU<->little_endian by swapping bytes" */
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198 | #if BB_BIG_ENDIAN
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199 | # define SWAP_BE16(x) (x)
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200 | # define SWAP_BE32(x) (x)
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201 | # define SWAP_BE64(x) (x)
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202 | # define SWAP_LE16(x) bswap_16(x)
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203 | # define SWAP_LE32(x) bswap_32(x)
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204 | # define SWAP_LE64(x) bb_bswap_64(x)
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205 | # define IF_BIG_ENDIAN(...) __VA_ARGS__
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206 | # define IF_LITTLE_ENDIAN(...)
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207 | #else
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208 | # define SWAP_BE16(x) bswap_16(x)
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209 | # define SWAP_BE32(x) bswap_32(x)
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210 | # define SWAP_BE64(x) bb_bswap_64(x)
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211 | # define SWAP_LE16(x) (x)
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212 | # define SWAP_LE32(x) (x)
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213 | # define SWAP_LE64(x) (x)
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214 | # define IF_BIG_ENDIAN(...)
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215 | # define IF_LITTLE_ENDIAN(...) __VA_ARGS__
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216 | #endif
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217 |
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218 | /* ---- Unaligned access ------------------------------------ */
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219 |
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220 | /* NB: unaligned parameter should be a pointer, aligned one -
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221 | * a lvalue. This makes it more likely to not swap them by mistake
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222 | */
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223 | #if defined(i386) || defined(__x86_64__) || defined(__powerpc__)
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224 | # include <stdint.h>
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225 | typedef int bb__aliased_int FIX_ALIASING;
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226 | typedef uint16_t bb__aliased_uint16_t FIX_ALIASING;
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227 | typedef uint32_t bb__aliased_uint32_t FIX_ALIASING;
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228 | # define move_from_unaligned_int(v, intp) ((v) = *(bb__aliased_int*)(intp))
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229 | # define move_from_unaligned16(v, u16p) ((v) = *(bb__aliased_uint16_t*)(u16p))
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230 | # define move_from_unaligned32(v, u32p) ((v) = *(bb__aliased_uint32_t*)(u32p))
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231 | # define move_to_unaligned16(u16p, v) (*(bb__aliased_uint16_t*)(u16p) = (v))
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232 | # define move_to_unaligned32(u32p, v) (*(bb__aliased_uint32_t*)(u32p) = (v))
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233 | /* #elif ... - add your favorite arch today! */
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234 | #else
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235 | /* performs reasonably well (gcc usually inlines memcpy here) */
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236 | # define move_from_unaligned_int(v, intp) (memcpy(&(v), (intp), sizeof(int)))
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237 | # define move_from_unaligned16(v, u16p) (memcpy(&(v), (u16p), 2))
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238 | # define move_from_unaligned32(v, u32p) (memcpy(&(v), (u32p), 4))
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239 | # define move_to_unaligned16(u16p, v) do { \
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240 | uint16_t __t = (v); \
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241 | memcpy((u16p), &__t, 4); \
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242 | } while (0)
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243 | # define move_to_unaligned32(u32p, v) do { \
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244 | uint32_t __t = (v); \
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245 | memcpy((u32p), &__t, 4); \
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246 | } while (0)
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247 | #endif
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248 |
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249 | /* ---- Compiler dependent settings ------------------------- */
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250 |
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251 | #if (defined __digital__ && defined __unix__) \
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252 | || defined __APPLE__ \
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253 | || defined __FreeBSD__ || defined __OpenBSD__ || defined __NetBSD__
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254 | # undef HAVE_MNTENT_H
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255 | # undef HAVE_SYS_STATFS_H
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256 | #else
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257 | # define HAVE_MNTENT_H 1
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258 | /* Patch bco to compile this busybox on rhel3 */
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259 | #include <linux/version.h>
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260 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
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261 | # define HAVE_SYS_STATFS_H 1
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262 | #endif
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263 | #endif
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264 |
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265 | /*----- Kernel versioning ------------------------------------*/
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266 |
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267 | #ifndef KERNEL_VERSION
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268 | #define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
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269 | #endif
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270 |
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271 | /* ---- Miscellaneous --------------------------------------- */
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272 |
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273 | #if defined __GLIBC__ || defined __UCLIBC__ \
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274 | || defined __dietlibc__ || defined _NEWLIB_VERSION
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275 | # include <features.h>
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276 | #endif
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277 |
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278 | /* Size-saving "small" ints (arch-dependent) */
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279 | #if defined(i386) || defined(__x86_64__) || defined(__mips__) || defined(__cris__)
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280 | /* add other arches which benefit from this... */
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281 | typedef signed char smallint;
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282 | typedef unsigned char smalluint;
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283 | #else
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284 | /* for arches where byte accesses generate larger code: */
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285 | typedef int smallint;
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286 | typedef unsigned smalluint;
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287 | #endif
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288 |
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289 | /* ISO C Standard: 7.16 Boolean type and values <stdbool.h> */
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290 | #if (defined __digital__ && defined __unix__)
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291 | /* old system without (proper) C99 support */
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292 | # define bool smalluint
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293 | #else
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294 | /* modern system, so use it */
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295 | # include <stdbool.h>
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296 | #endif
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297 |
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298 | /* Try to defeat gcc's alignment of "char message[]"-like data */
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299 | #if 1 /* if needed: !defined(arch1) && !defined(arch2) */
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300 | # define ALIGN1 __attribute__((aligned(1)))
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301 | # define ALIGN2 __attribute__((aligned(2)))
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302 | # define ALIGN4 __attribute__((aligned(4)))
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303 | #else
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304 | /* Arches which MUST have 2 or 4 byte alignment for everything are here */
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305 | # define ALIGN1
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306 | # define ALIGN2
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307 | # define ALIGN4
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308 | #endif
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309 |
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310 |
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311 | /* uclibc does not implement daemon() for no-mmu systems.
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312 | * For 0.9.29 and svn, __ARCH_USE_MMU__ indicates no-mmu reliably.
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313 | * For earlier versions there is no reliable way to check if we are building
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314 | * for a mmu-less system.
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315 | */
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316 | #if ENABLE_NOMMU || \
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317 | (defined __UCLIBC__ && __UCLIBC_MAJOR__ >= 0 && __UCLIBC_MINOR__ >= 9 && \
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318 | __UCLIBC_SUBLEVEL__ > 28 && !defined __ARCH_USE_MMU__)
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319 | # define BB_MMU 0
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320 | # define USE_FOR_NOMMU(...) __VA_ARGS__
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321 | # define USE_FOR_MMU(...)
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322 | #else
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323 | # define BB_MMU 1
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324 | # define USE_FOR_NOMMU(...)
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325 | # define USE_FOR_MMU(...) __VA_ARGS__
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326 | #endif
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327 |
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328 | /* Don't use lchown with glibc older than 2.1.x */
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329 | #if defined(__GLIBC__) && __GLIBC__ <= 2 && __GLIBC_MINOR__ < 1
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330 | # define lchown chown
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331 | #endif
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332 |
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333 | #if defined(__digital__) && defined(__unix__)
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334 |
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335 | # include <standards.h>
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336 | # include <inttypes.h>
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337 | # define PRIu32 "u"
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338 | /* use legacy setpgrp(pid_t,pid_t) for now. move to platform.c */
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339 | # define bb_setpgrp() do { pid_t __me = getpid(); setpgrp(__me, __me); } while (0)
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340 | # if !defined ADJ_OFFSET_SINGLESHOT && defined MOD_CLKA && defined MOD_OFFSET
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341 | # define ADJ_OFFSET_SINGLESHOT (MOD_CLKA | MOD_OFFSET)
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342 | # endif
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343 | # if !defined ADJ_FREQUENCY && defined MOD_FREQUENCY
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344 | # define ADJ_FREQUENCY MOD_FREQUENCY
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345 | # endif
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346 | # if !defined ADJ_TIMECONST && defined MOD_TIMECONST
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347 | # define ADJ_TIMECONST MOD_TIMECONST
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348 | # endif
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349 | # if !defined ADJ_TICK && defined MOD_CLKB
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350 | # define ADJ_TICK MOD_CLKB
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351 | # endif
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352 |
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353 | #else
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354 |
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355 | # define bb_setpgrp() setpgrp()
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356 |
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357 | #endif
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358 |
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359 | #if defined(__GLIBC__)
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360 | # define fdprintf dprintf
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361 | #endif
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362 |
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363 | #if defined(__dietlibc__)
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364 | # undef HAVE_STRCHRNUL
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365 | #endif
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366 |
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367 | #if defined(__WATCOMC__)
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368 | # undef HAVE_FDPRINTF
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369 | # undef HAVE_MEMRCHR
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370 | # undef HAVE_MKDTEMP
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371 | # undef HAVE_SETBIT
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372 | # undef HAVE_STRCASESTR
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373 | # undef HAVE_STRCHRNUL
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374 | # undef HAVE_STRSEP
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375 | # undef HAVE_STRSIGNAL
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376 | # undef HAVE_VASPRINTF
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377 | #endif
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378 |
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379 | #if defined(__FreeBSD__)
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380 | # undef HAVE_STRCHRNUL
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381 | #endif
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382 |
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383 | /*
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384 | * Now, define prototypes for all the functions defined in platform.c
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385 | * These must come after all the HAVE_* macros are defined (or not)
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386 | */
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387 |
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388 | #ifndef HAVE_FDPRINTF
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389 | extern int fdprintf(int fd, const char *format, ...);
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390 | #endif
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391 |
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392 | #ifndef HAVE_MEMRCHR
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393 | extern void *memrchr(const void *s, int c, size_t n) FAST_FUNC;
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394 | #endif
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395 |
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396 | #ifndef HAVE_MKDTEMP
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397 | extern char *mkdtemp(char *template) FAST_FUNC;
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398 | #endif
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399 |
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400 | #ifndef HAVE_SETBIT
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401 | # define setbit(a, b) ((a)[(b) >> 3] |= 1 << ((b) & 7))
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402 | # define clrbit(a, b) ((a)[(b) >> 3] &= ~(1 << ((b) & 7)))
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403 | #endif
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404 |
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405 | #ifndef HAVE_STRCASESTR
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406 | extern char *strcasestr(const char *s, const char *pattern) FAST_FUNC;
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407 | #endif
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408 |
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409 | #ifndef HAVE_STRCHRNUL
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410 | extern char *strchrnul(const char *s, int c) FAST_FUNC;
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411 | #endif
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412 |
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413 | #ifndef HAVE_STRSEP
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414 | extern char *strsep(char **stringp, const char *delim) FAST_FUNC;
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415 | #endif
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416 |
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417 | #ifndef HAVE_STRSIGNAL
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418 | /* Not exactly the same: instead of "Stopped" it shows "STOP" etc */
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419 | # define strsignal(sig) get_signame(sig)
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420 | #endif
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421 |
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422 | #ifndef HAVE_VASPRINTF
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423 | extern int vasprintf(char **string_ptr, const char *format, va_list p) FAST_FUNC;
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424 | #endif
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425 |
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426 | #endif
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