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 |
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11 | /* Convenience macros to test the version of gcc. */
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12 | #undef __GNUC_PREREQ
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13 | #if defined __GNUC__ && defined __GNUC_MINOR__
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14 | # define __GNUC_PREREQ(maj, min) \
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15 | ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
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16 | #else
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17 | # define __GNUC_PREREQ(maj, min) 0
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18 | #endif
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19 |
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20 | /* __restrict is known in EGCS 1.2 and above. */
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21 | #if !__GNUC_PREREQ(2,92)
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22 | # ifndef __restrict
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23 | # define __restrict
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24 | # endif
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25 | #endif
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26 |
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27 | #if !__GNUC_PREREQ(2,7)
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28 | # ifndef __attribute__
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29 | # define __attribute__(x)
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30 | # endif
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31 | #endif
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32 |
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33 | #undef inline
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34 | #if defined(__STDC_VERSION__) && __STDC_VERSION__ > 199901L
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35 | /* it's a keyword */
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36 | #elif __GNUC_PREREQ(2,7)
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37 | # define inline __inline__
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38 | #else
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39 | # define inline
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40 | #endif
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41 |
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42 | #ifndef __const
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43 | # define __const const
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44 | #endif
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45 |
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46 | #define UNUSED_PARAM __attribute__ ((__unused__))
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47 | #define NORETURN __attribute__ ((__noreturn__))
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48 | /* "The malloc attribute is used to tell the compiler that a function
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49 | * may be treated as if any non-NULL pointer it returns cannot alias
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50 | * any other pointer valid when the function returns. This will often
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51 | * improve optimization. Standard functions with this property include
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52 | * malloc and calloc. realloc-like functions have this property as long
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53 | * as the old pointer is never referred to (including comparing it
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54 | * to the new pointer) after the function returns a non-NULL value."
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55 | */
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56 | #define RETURNS_MALLOC __attribute__ ((malloc))
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57 | #define PACKED __attribute__ ((__packed__))
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58 | #define ALIGNED(m) __attribute__ ((__aligned__(m)))
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59 |
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60 | /* __NO_INLINE__: some gcc's do not honor inlining! :( */
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61 | #if __GNUC_PREREQ(3,0) && !defined(__NO_INLINE__)
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62 | # define ALWAYS_INLINE __attribute__ ((always_inline)) inline
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63 | /* I've seen a toolchain where I needed __noinline__ instead of noinline */
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64 | # define NOINLINE __attribute__((__noinline__))
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65 | # if !ENABLE_WERROR
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66 | # define DEPRECATED __attribute__ ((__deprecated__))
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67 | # define UNUSED_PARAM_RESULT __attribute__ ((warn_unused_result))
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68 | # else
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69 | # define DEPRECATED
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70 | # define UNUSED_PARAM_RESULT
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71 | # endif
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72 | #else
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73 | # define ALWAYS_INLINE inline
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74 | # define NOINLINE
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75 | # define DEPRECATED
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76 | # define UNUSED_PARAM_RESULT
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77 | #endif
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78 |
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79 | /* -fwhole-program makes all symbols local. The attribute externally_visible
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80 | * forces a symbol global. */
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81 | #if __GNUC_PREREQ(4,1)
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82 | # define EXTERNALLY_VISIBLE __attribute__(( visibility("default") ))
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83 | //__attribute__ ((__externally_visible__))
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84 | #else
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85 | # define EXTERNALLY_VISIBLE
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86 | #endif
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87 |
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88 | /* At 4.4 gcc become much more anal about this, need to use "aliased" types */
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89 | #if __GNUC_PREREQ(4,4)
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90 | # define FIX_ALIASING __attribute__((__may_alias__))
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91 | #else
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92 | # define FIX_ALIASING
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93 | #endif
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94 |
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95 | /* We use __extension__ in some places to suppress -pedantic warnings
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96 | * about GCC extensions. This feature didn't work properly before
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97 | * gcc 2.8. */
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98 | #if !__GNUC_PREREQ(2,8)
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99 | # ifndef __extension__
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100 | # define __extension__
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101 | # endif
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102 | #endif
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103 |
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104 | /* FAST_FUNC is a qualifier which (possibly) makes function call faster
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105 | * and/or smaller by using modified ABI. It is usually only needed
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106 | * on non-static, busybox internal functions. Recent versions of gcc
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107 | * optimize statics automatically. FAST_FUNC on static is required
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108 | * only if you need to match a function pointer's type */
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109 | #if __GNUC_PREREQ(3,0) && defined(i386) /* || defined(__x86_64__)? */
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110 | /* stdcall makes callee to pop arguments from stack, not caller */
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111 | # define FAST_FUNC __attribute__((regparm(3),stdcall))
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112 | /* #elif ... - add your favorite arch today! */
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113 | #else
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114 | # define FAST_FUNC
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115 | #endif
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116 |
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117 | /* Make all declarations hidden (-fvisibility flag only affects definitions) */
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118 | /* (don't include system headers after this until corresponding pop!) */
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119 | #if __GNUC_PREREQ(4,1) && !defined(__CYGWIN__)
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120 | # define PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN _Pragma("GCC visibility push(hidden)")
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121 | # define POP_SAVED_FUNCTION_VISIBILITY _Pragma("GCC visibility pop")
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122 | #else
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123 | # define PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN
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124 | # define POP_SAVED_FUNCTION_VISIBILITY
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125 | #endif
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126 |
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127 | /* gcc-2.95 had no va_copy but only __va_copy. */
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128 | #if !__GNUC_PREREQ(3,0)
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129 | # include <stdarg.h>
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130 | # if !defined va_copy && defined __va_copy
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131 | # define va_copy(d,s) __va_copy((d),(s))
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132 | # endif
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133 | #endif
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134 |
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135 |
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136 | /* ---- Endian Detection ------------------------------------ */
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137 |
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138 | #include <limits.h>
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139 | #if defined(__digital__) && defined(__unix__)
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140 | # include <sex.h>
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141 | #elif defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) \
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142 | || defined(__APPLE__)
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143 | # include <sys/resource.h> /* rlimit */
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144 | # include <machine/endian.h>
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145 | # define bswap_64 __bswap64
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146 | # define bswap_32 __bswap32
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147 | # define bswap_16 __bswap16
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148 | #else
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149 | # include <byteswap.h>
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150 | # include <endian.h>
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151 | #endif
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152 |
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153 | #if defined(__BYTE_ORDER) && __BYTE_ORDER == __BIG_ENDIAN
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154 | # define BB_BIG_ENDIAN 1
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155 | # define BB_LITTLE_ENDIAN 0
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156 | #elif defined(__BYTE_ORDER) && __BYTE_ORDER == __LITTLE_ENDIAN
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157 | # define BB_BIG_ENDIAN 0
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158 | # define BB_LITTLE_ENDIAN 1
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159 | #elif defined(_BYTE_ORDER) && _BYTE_ORDER == _BIG_ENDIAN
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160 | # define BB_BIG_ENDIAN 1
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161 | # define BB_LITTLE_ENDIAN 0
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162 | #elif defined(_BYTE_ORDER) && _BYTE_ORDER == _LITTLE_ENDIAN
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163 | # define BB_BIG_ENDIAN 0
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164 | # define BB_LITTLE_ENDIAN 1
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165 | #elif defined(BYTE_ORDER) && BYTE_ORDER == BIG_ENDIAN
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166 | # define BB_BIG_ENDIAN 1
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167 | # define BB_LITTLE_ENDIAN 0
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168 | #elif defined(BYTE_ORDER) && BYTE_ORDER == LITTLE_ENDIAN
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169 | # define BB_BIG_ENDIAN 0
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170 | # define BB_LITTLE_ENDIAN 1
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171 | #elif defined(__386__)
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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 | #else
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175 | # error "Can't determine endianness"
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176 | #endif
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177 |
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178 | #if ULONG_MAX > 0xffffffff
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179 | # define bb_bswap_64(x) bswap_64(x)
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180 | #endif
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181 |
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182 | /* SWAP_LEnn means "convert CPU<->little_endian by swapping bytes" */
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183 | #if BB_BIG_ENDIAN
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184 | # define SWAP_BE16(x) (x)
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185 | # define SWAP_BE32(x) (x)
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186 | # define SWAP_BE64(x) (x)
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187 | # define SWAP_LE16(x) bswap_16(x)
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188 | # define SWAP_LE32(x) bswap_32(x)
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189 | # define SWAP_LE64(x) bb_bswap_64(x)
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190 | # define IF_BIG_ENDIAN(...) __VA_ARGS__
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191 | # define IF_LITTLE_ENDIAN(...)
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192 | #else
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193 | # define SWAP_BE16(x) bswap_16(x)
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194 | # define SWAP_BE32(x) bswap_32(x)
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195 | # define SWAP_BE64(x) bb_bswap_64(x)
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196 | # define SWAP_LE16(x) (x)
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197 | # define SWAP_LE32(x) (x)
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198 | # define SWAP_LE64(x) (x)
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199 | # define IF_BIG_ENDIAN(...)
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200 | # define IF_LITTLE_ENDIAN(...) __VA_ARGS__
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201 | #endif
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202 |
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203 |
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204 | /* ---- Unaligned access ------------------------------------ */
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205 |
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206 | #include <stdint.h>
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207 | typedef int bb__aliased_int FIX_ALIASING;
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208 | typedef long bb__aliased_long FIX_ALIASING;
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209 | typedef uint16_t bb__aliased_uint16_t FIX_ALIASING;
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210 | typedef uint32_t bb__aliased_uint32_t FIX_ALIASING;
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211 |
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212 | /* NB: unaligned parameter should be a pointer, aligned one -
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213 | * a lvalue. This makes it more likely to not swap them by mistake
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214 | */
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215 | #if defined(i386) || defined(__x86_64__) || defined(__powerpc__)
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216 | # define move_from_unaligned_int(v, intp) ((v) = *(bb__aliased_int*)(intp))
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217 | # define move_from_unaligned_long(v, longp) ((v) = *(bb__aliased_long*)(longp))
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218 | # define move_from_unaligned16(v, u16p) ((v) = *(bb__aliased_uint16_t*)(u16p))
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219 | # define move_from_unaligned32(v, u32p) ((v) = *(bb__aliased_uint32_t*)(u32p))
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220 | # define move_to_unaligned16(u16p, v) (*(bb__aliased_uint16_t*)(u16p) = (v))
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221 | # define move_to_unaligned32(u32p, v) (*(bb__aliased_uint32_t*)(u32p) = (v))
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222 | /* #elif ... - add your favorite arch today! */
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223 | #else
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224 | /* performs reasonably well (gcc usually inlines memcpy here) */
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225 | # define move_from_unaligned_int(v, intp) (memcpy(&(v), (intp), sizeof(int)))
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226 | # define move_from_unaligned_long(v, longp) (memcpy(&(v), (longp), sizeof(long)))
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227 | # define move_from_unaligned16(v, u16p) (memcpy(&(v), (u16p), 2))
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228 | # define move_from_unaligned32(v, u32p) (memcpy(&(v), (u32p), 4))
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229 | # define move_to_unaligned16(u16p, v) do { \
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230 | uint16_t __t = (v); \
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231 | memcpy((u16p), &__t, 2); \
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232 | } while (0)
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233 | # define move_to_unaligned32(u32p, v) do { \
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234 | uint32_t __t = (v); \
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235 | memcpy((u32p), &__t, 4); \
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236 | } while (0)
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237 | #endif
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238 |
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239 |
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240 | /* ---- Size-saving "small" ints (arch-dependent) ----------- */
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241 |
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242 | #if defined(i386) || defined(__x86_64__) || defined(__mips__) || defined(__cris__)
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243 | /* add other arches which benefit from this... */
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244 | typedef signed char smallint;
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245 | typedef unsigned char smalluint;
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246 | #else
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247 | /* for arches where byte accesses generate larger code: */
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248 | typedef int smallint;
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249 | typedef unsigned smalluint;
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250 | #endif
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251 |
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252 | /* ISO C Standard: 7.16 Boolean type and values <stdbool.h> */
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253 | #if (defined __digital__ && defined __unix__)
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254 | /* old system without (proper) C99 support */
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255 | # define bool smalluint
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256 | #else
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257 | /* modern system, so use it */
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258 | # include <stdbool.h>
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259 | #endif
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260 |
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261 |
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262 | /*----- Kernel versioning ------------------------------------*/
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263 |
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264 | #define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
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265 |
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266 |
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267 | /* ---- Miscellaneous --------------------------------------- */
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268 |
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269 | #if defined __GLIBC__ \
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270 | || defined __UCLIBC__ \
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271 | || defined __dietlibc__ \
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272 | || defined __BIONIC__ \
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273 | || defined _NEWLIB_VERSION
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274 | # include <features.h>
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275 | #endif
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276 |
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277 | /* Define bb_setpgrp */
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278 | #if defined(__digital__) && defined(__unix__)
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279 | /* use legacy setpgrp(pid_t, pid_t) for now. move to platform.c */
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280 | # define bb_setpgrp() do { pid_t __me = getpid(); setpgrp(__me, __me); } while (0)
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281 | #else
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282 | # define bb_setpgrp() setpgrp()
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283 | #endif
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284 |
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285 | /* fdprintf is more readable, we used it before dprintf was standardized */
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286 | #include <unistd.h>
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287 | #define fdprintf dprintf
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288 |
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289 | /* Useful for defeating gcc's alignment of "char message[]"-like data */
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290 | #if !defined(__s390__)
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291 | /* on s390[x], non-word-aligned data accesses require larger code */
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292 | # define ALIGN1 __attribute__((aligned(1)))
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293 | # define ALIGN2 __attribute__((aligned(2)))
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294 | # define ALIGN4 __attribute__((aligned(4)))
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295 | #else
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296 | /* Arches which MUST have 2 or 4 byte alignment for everything are here */
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297 | # define ALIGN1
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298 | # define ALIGN2
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299 | # define ALIGN4
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300 | #endif
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301 |
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302 | /*
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303 | * For 0.9.29 and svn, __ARCH_USE_MMU__ indicates no-mmu reliably.
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304 | * For earlier versions there is no reliable way to check if we are building
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305 | * for a mmu-less system.
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306 | */
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307 | #if ENABLE_NOMMU || \
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308 | (defined __UCLIBC__ && __UCLIBC_MAJOR__ >= 0 && __UCLIBC_MINOR__ >= 9 && \
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309 | __UCLIBC_SUBLEVEL__ > 28 && !defined __ARCH_USE_MMU__)
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310 | # define BB_MMU 0
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311 | # define USE_FOR_NOMMU(...) __VA_ARGS__
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312 | # define USE_FOR_MMU(...)
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313 | #else
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314 | # define BB_MMU 1
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315 | # define USE_FOR_NOMMU(...)
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316 | # define USE_FOR_MMU(...) __VA_ARGS__
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317 | #endif
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318 |
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319 | #if defined(__digital__) && defined(__unix__)
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320 | # include <standards.h>
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321 | # include <inttypes.h>
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322 | # define PRIu32 "u"
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323 | # if !defined ADJ_OFFSET_SINGLESHOT && defined MOD_CLKA && defined MOD_OFFSET
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324 | # define ADJ_OFFSET_SINGLESHOT (MOD_CLKA | MOD_OFFSET)
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325 | # endif
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326 | # if !defined ADJ_FREQUENCY && defined MOD_FREQUENCY
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327 | # define ADJ_FREQUENCY MOD_FREQUENCY
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328 | # endif
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329 | # if !defined ADJ_TIMECONST && defined MOD_TIMECONST
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330 | # define ADJ_TIMECONST MOD_TIMECONST
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331 | # endif
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332 | # if !defined ADJ_TICK && defined MOD_CLKB
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333 | # define ADJ_TICK MOD_CLKB
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334 | # endif
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335 | #endif
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336 |
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337 | #if defined(__CYGWIN__)
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338 | # define MAXSYMLINKS SYMLOOP_MAX
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339 | #endif
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340 |
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341 | #if defined(ANDROID) || defined(__ANDROID__)
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342 | # define BB_ADDITIONAL_PATH ":/system/sbin:/system/bin:/system/xbin"
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343 | # define SYS_ioprio_set __NR_ioprio_set
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344 | # define SYS_ioprio_get __NR_ioprio_get
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345 | #endif
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346 |
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347 |
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348 | /* ---- Who misses what? ------------------------------------ */
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349 |
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350 | /* Assume all these functions and header files exist by default.
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351 | * Platforms where it is not true will #undef them below.
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352 | */
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353 | #define HAVE_CLEARENV 1
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354 | #define HAVE_FDATASYNC 1
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355 | #define HAVE_DPRINTF 1
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356 | #define HAVE_MEMRCHR 1
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357 | #define HAVE_MKDTEMP 1
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358 | #define HAVE_PTSNAME_R 1
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359 | #define HAVE_SETBIT 1
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360 | #define HAVE_SIGHANDLER_T 1
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361 | #define HAVE_STPCPY 1
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362 | #define HAVE_STRCASESTR 1
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363 | #define HAVE_STRCHRNUL 1
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364 | #define HAVE_STRSEP 1
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365 | #define HAVE_STRSIGNAL 1
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366 | #define HAVE_STRVERSCMP 1
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367 | #define HAVE_VASPRINTF 1
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368 | #define HAVE_UNLOCKED_STDIO 1
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369 | #define HAVE_UNLOCKED_LINE_OPS 1
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370 | #define HAVE_GETLINE 1
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371 | #define HAVE_XTABS 1
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372 | #define HAVE_MNTENT_H 1
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373 | #define HAVE_NET_ETHERNET_H 1
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374 | #define HAVE_SYS_STATFS_H 1
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375 |
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376 | #if defined(__UCLIBC_MAJOR__)
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377 | # if __UCLIBC_MAJOR__ == 0 \
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378 | && ( __UCLIBC_MINOR__ < 9 \
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379 | || (__UCLIBC_MINOR__ == 9 && __UCLIBC_SUBLEVEL__ < 32) \
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380 | )
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381 | # undef HAVE_STRVERSCMP
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382 | # endif
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383 | #endif
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384 |
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385 | #if defined(__dietlibc__)
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386 | # undef HAVE_STRCHRNUL
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387 | #endif
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388 |
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389 | #if defined(__WATCOMC__)
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390 | # undef HAVE_DPRINTF
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391 | # undef HAVE_GETLINE
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392 | # undef HAVE_MEMRCHR
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393 | # undef HAVE_MKDTEMP
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394 | # undef HAVE_SETBIT
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395 | # undef HAVE_STPCPY
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396 | # undef HAVE_STRCASESTR
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397 | # undef HAVE_STRCHRNUL
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398 | # undef HAVE_STRSEP
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399 | # undef HAVE_STRSIGNAL
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400 | # undef HAVE_STRVERSCMP
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401 | # undef HAVE_VASPRINTF
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402 | # undef HAVE_UNLOCKED_STDIO
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403 | # undef HAVE_UNLOCKED_LINE_OPS
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404 | # undef HAVE_NET_ETHERNET_H
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405 | #endif
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406 |
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407 | #if defined(__CYGWIN__)
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408 | # undef HAVE_CLEARENV
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409 | # undef HAVE_FDPRINTF
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410 | # undef HAVE_MEMRCHR
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411 | # undef HAVE_PTSNAME_R
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412 | # undef HAVE_STRVERSCMP
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413 | # undef HAVE_UNLOCKED_LINE_OPS
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414 | #endif
|
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415 |
|
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416 | /* These BSD-derived OSes share many similarities */
|
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417 | #if (defined __digital__ && defined __unix__) \
|
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418 | || defined __APPLE__ \
|
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419 | || defined __FreeBSD__ || defined __OpenBSD__ || defined __NetBSD__
|
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420 | # undef HAVE_CLEARENV
|
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421 | # undef HAVE_FDATASYNC
|
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422 | # undef HAVE_GETLINE
|
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423 | # undef HAVE_MNTENT_H
|
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424 | # undef HAVE_PTSNAME_R
|
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425 | # undef HAVE_SYS_STATFS_H
|
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426 | # undef HAVE_SIGHANDLER_T
|
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427 | # undef HAVE_STRVERSCMP
|
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428 | # undef HAVE_XTABS
|
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429 | # undef HAVE_DPRINTF
|
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430 | # undef HAVE_UNLOCKED_STDIO
|
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431 | # undef HAVE_UNLOCKED_LINE_OPS
|
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432 | #endif
|
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433 |
|
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434 | #if defined(__FreeBSD__)
|
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435 | # undef HAVE_STRCHRNUL
|
---|
436 | #endif
|
---|
437 |
|
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438 | #if defined(__NetBSD__)
|
---|
439 | # define HAVE_GETLINE 1 /* Recent NetBSD versions have getline() */
|
---|
440 | #endif
|
---|
441 |
|
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442 | #if defined(__digital__) && defined(__unix__)
|
---|
443 | # undef HAVE_STPCPY
|
---|
444 | #endif
|
---|
445 |
|
---|
446 | #if defined(ANDROID) || defined(__ANDROID__)
|
---|
447 | # undef HAVE_DPRINTF
|
---|
448 | # undef HAVE_GETLINE
|
---|
449 | # undef HAVE_STPCPY
|
---|
450 | # undef HAVE_STRCHRNUL
|
---|
451 | # undef HAVE_STRVERSCMP
|
---|
452 | # undef HAVE_UNLOCKED_LINE_OPS
|
---|
453 | # undef HAVE_NET_ETHERNET_H
|
---|
454 | #endif
|
---|
455 |
|
---|
456 | /*
|
---|
457 | * Now, define prototypes for all the functions defined in platform.c
|
---|
458 | * These must come after all the HAVE_* macros are defined (or not)
|
---|
459 | */
|
---|
460 |
|
---|
461 | #ifndef HAVE_DPRINTF
|
---|
462 | extern int dprintf(int fd, const char *format, ...);
|
---|
463 | #endif
|
---|
464 |
|
---|
465 | #ifndef HAVE_MEMRCHR
|
---|
466 | extern void *memrchr(const void *s, int c, size_t n) FAST_FUNC;
|
---|
467 | #endif
|
---|
468 |
|
---|
469 | #ifndef HAVE_MKDTEMP
|
---|
470 | extern char *mkdtemp(char *template) FAST_FUNC;
|
---|
471 | #endif
|
---|
472 |
|
---|
473 | #ifndef HAVE_SETBIT
|
---|
474 | # define setbit(a, b) ((a)[(b) >> 3] |= 1 << ((b) & 7))
|
---|
475 | # define clrbit(a, b) ((a)[(b) >> 3] &= ~(1 << ((b) & 7)))
|
---|
476 | #endif
|
---|
477 |
|
---|
478 | #ifndef HAVE_SIGHANDLER_T
|
---|
479 | typedef void (*sighandler_t)(int);
|
---|
480 | #endif
|
---|
481 |
|
---|
482 | #ifndef HAVE_STPCPY
|
---|
483 | extern char *stpcpy(char *p, const char *to_add) FAST_FUNC;
|
---|
484 | #endif
|
---|
485 |
|
---|
486 | #ifndef HAVE_STRCASESTR
|
---|
487 | extern char *strcasestr(const char *s, const char *pattern) FAST_FUNC;
|
---|
488 | #endif
|
---|
489 |
|
---|
490 | #ifndef HAVE_STRCHRNUL
|
---|
491 | extern char *strchrnul(const char *s, int c) FAST_FUNC;
|
---|
492 | #endif
|
---|
493 |
|
---|
494 | #ifndef HAVE_STRSEP
|
---|
495 | extern char *strsep(char **stringp, const char *delim) FAST_FUNC;
|
---|
496 | #endif
|
---|
497 |
|
---|
498 | #ifndef HAVE_STRSIGNAL
|
---|
499 | /* Not exactly the same: instead of "Stopped" it shows "STOP" etc */
|
---|
500 | # define strsignal(sig) get_signame(sig)
|
---|
501 | #endif
|
---|
502 |
|
---|
503 | #ifndef HAVE_VASPRINTF
|
---|
504 | extern int vasprintf(char **string_ptr, const char *format, va_list p) FAST_FUNC;
|
---|
505 | #endif
|
---|
506 |
|
---|
507 | #ifndef HAVE_GETLINE
|
---|
508 | # include <stdio.h> /* for FILE */
|
---|
509 | # include <sys/types.h> /* size_t */
|
---|
510 | extern ssize_t getline(char **lineptr, size_t *n, FILE *stream) FAST_FUNC;
|
---|
511 | #endif
|
---|
512 |
|
---|
513 | #endif
|
---|