1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | Copyright 2006, Bernhard Fischer
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4 |
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5 | Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
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6 | */
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7 | #ifndef __PLATFORM_H
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8 | #define __PLATFORM_H 1
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9 |
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10 | /* Convenience macros to test the version of gcc. */
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11 | #undef __GNUC_PREREQ
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12 | #if defined __GNUC__ && defined __GNUC_MINOR__
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13 | # define __GNUC_PREREQ(maj, min) \
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14 | ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
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15 | #else
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16 | # define __GNUC_PREREQ(maj, min) 0
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17 | #endif
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18 |
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19 | /* __restrict is known in EGCS 1.2 and above. */
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20 | #if !__GNUC_PREREQ (2,92)
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21 | # ifndef __restrict
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22 | # define __restrict /* Ignore */
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23 | # endif
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24 | #endif
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25 |
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26 | /* Define macros for some gcc attributes. This permits us to use the
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27 | macros freely, and know that they will come into play for the
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28 | version of gcc in which they are supported. */
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29 |
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30 | #if !__GNUC_PREREQ (2,7)
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31 | # ifndef __attribute__
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32 | # define __attribute__(x)
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33 | # endif
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34 | #endif
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35 |
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36 | #undef inline
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37 | #if defined(__STDC_VERSION__) && __STDC_VERSION__ > 199901L
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38 | /* it's a keyword */
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39 | #else
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40 | # if __GNUC_PREREQ (2,7)
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41 | # define inline __inline__
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42 | # else
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43 | # define inline
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44 | # endif
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45 | #endif
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46 |
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47 | #ifndef __const
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48 | # define __const const
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49 | #endif
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50 |
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51 | # define ATTRIBUTE_UNUSED __attribute__ ((__unused__))
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52 | # define ATTRIBUTE_NORETURN __attribute__ ((__noreturn__))
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53 | # define ATTRIBUTE_PACKED __attribute__ ((__packed__))
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54 | # define ATTRIBUTE_ALIGNED(m) __attribute__ ((__aligned__(m)))
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55 | # if __GNUC_PREREQ (3,0)
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56 | # define ALWAYS_INLINE __attribute__ ((always_inline)) inline
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57 | # if !ENABLE_WERROR
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58 | # define ATTRIBUTE_DEPRECATED __attribute__ ((__deprecated__))
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59 | # define ATTRIBUTE_UNUSED_RESULT __attribute__ ((warn_unused_result))
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60 | # else
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61 | # define ATTRIBUTE_DEPRECATED /* n/a */
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62 | # define ATTRIBUTE_UNUSED_RESULT /* n/a */
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63 | # endif
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64 | # else
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65 | # define ALWAYS_INLINE inline
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66 | # define ATTRIBUTE_DEPRECATED /* n/a */
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67 | # define ATTRIBUTE_UNUSED_RESULT /* n/a */
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68 | # endif
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69 |
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70 | /* -fwhole-program makes all symbols local. The attribute externally_visible
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71 | forces a symbol global. */
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72 | # if __GNUC_PREREQ (4,1)
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73 | # define ATTRIBUTE_EXTERNALLY_VISIBLE __attribute__ ((__externally_visible__))
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74 | # else
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75 | # define ATTRIBUTE_EXTERNALLY_VISIBLE
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76 | # endif /* GNUC >= 4.1 */
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77 |
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78 | /* We use __extension__ in some places to suppress -pedantic warnings
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79 | about GCC extensions. This feature didn't work properly before
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80 | gcc 2.8. */
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81 | #if !__GNUC_PREREQ (2,8)
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82 | # ifndef __extension__
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83 | # define __extension__
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84 | # endif
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85 | #endif
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86 |
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87 | /* gcc-2.95 had no va_copy but only __va_copy. */
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88 | #if !__GNUC_PREREQ (3,0)
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89 | # include <stdarg.h>
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90 | # if !defined va_copy && defined __va_copy
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91 | # define va_copy(d,s) __va_copy((d),(s))
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92 | # endif
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93 | #endif
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94 |
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95 | /* ---- Endian Detection ------------------------------------ */
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96 |
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97 | #if (defined __digital__ && defined __unix__)
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98 | # include <sex.h>
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99 | # define __BIG_ENDIAN__ (BYTE_ORDER == BIG_ENDIAN)
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100 | # define __BYTE_ORDER BYTE_ORDER
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101 | #elif !defined __APPLE__
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102 | # include <byteswap.h>
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103 | # include <endian.h>
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104 | #endif
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105 |
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106 | #ifdef __BIG_ENDIAN__
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107 | # define BB_BIG_ENDIAN 1
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108 | # define BB_LITTLE_ENDIAN 0
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109 | #elif __BYTE_ORDER == __BIG_ENDIAN
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110 | # define BB_BIG_ENDIAN 1
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111 | # define BB_LITTLE_ENDIAN 0
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112 | #else
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113 | # define BB_BIG_ENDIAN 0
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114 | # define BB_LITTLE_ENDIAN 1
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115 | #endif
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116 |
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117 | #if BB_BIG_ENDIAN
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118 | #define SWAP_BE16(x) (x)
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119 | #define SWAP_BE32(x) (x)
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120 | #define SWAP_BE64(x) (x)
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121 | #define SWAP_LE16(x) bswap_16(x)
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122 | #define SWAP_LE32(x) bswap_32(x)
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123 | #define SWAP_LE64(x) bswap_64(x)
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124 | #else
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125 | #define SWAP_BE16(x) bswap_16(x)
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126 | #define SWAP_BE32(x) bswap_32(x)
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127 | #define SWAP_BE64(x) bswap_64(x)
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128 | #define SWAP_LE16(x) (x)
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129 | #define SWAP_LE32(x) (x)
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130 | #define SWAP_LE64(x) (x)
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131 | #endif
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132 |
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133 | /* ---- Networking ------------------------------------------ */
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134 | #ifndef __APPLE__
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135 | # include <arpa/inet.h>
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136 | #else
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137 | # include <netinet/in.h>
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138 | #endif
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139 |
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140 | #ifndef __socklen_t_defined
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141 | typedef int socklen_t;
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142 | #endif
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143 |
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144 | /* ---- Compiler dependent settings ------------------------- */
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145 | #if (defined __digital__ && defined __unix__)
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146 | # undef HAVE_MNTENT_H
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147 | #else
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148 | # define HAVE_MNTENT_H 1
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149 | #endif /* ___digital__ && __unix__ */
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150 |
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151 | /* linux/loop.h relies on __u64. Make sure we have that as a proper type
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152 | * until userspace is widely fixed. */
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153 | #ifndef __GNUC__
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154 | #if defined __INTEL_COMPILER
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155 | __extension__ typedef __signed__ long long __s64;
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156 | __extension__ typedef unsigned long long __u64;
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157 | #endif /* __INTEL_COMPILER */
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158 | #endif /* ifndef __GNUC__ */
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159 |
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160 | /*----- Kernel versioning ------------------------------------*/
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161 | #define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
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162 |
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163 | /* ---- miscellaneous --------------------------------------- */
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164 |
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165 | #if defined(__GNU_LIBRARY__) && __GNU_LIBRARY__ < 5 && \
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166 | !defined(__dietlibc__) && \
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167 | !defined(_NEWLIB_VERSION) && \
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168 | !(defined __digital__ && defined __unix__)
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169 | # error "Sorry, this libc version is not supported :("
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170 | #endif
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171 |
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172 | /* Don't perpetuate e2fsck crap into the headers. Clean up e2fsck instead. */
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173 |
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174 | #if defined __GLIBC__ || defined __UCLIBC__ \
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175 | || defined __dietlibc__ || defined _NEWLIB_VERSION
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176 | #include <features.h>
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177 | #define HAVE_FEATURES_H
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178 | #include <stdint.h>
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179 | #define HAVE_STDINT_H
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180 | #else
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181 | /* Largest integral types. */
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182 | #if __BIG_ENDIAN__
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183 | typedef long intmax_t;
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184 | typedef unsigned long uintmax_t;
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185 | #else
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186 | __extension__
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187 | typedef long long intmax_t;
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188 | __extension__
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189 | typedef unsigned long long uintmax_t;
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190 | #endif
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191 | #endif
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192 |
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193 | /* Size-saving "small" ints (arch-dependent) */
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194 | #if defined(i386) || defined(__x86_64__) || defined(__mips__) || defined(__cris__)
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195 | /* add other arches which benefit from this... */
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196 | typedef signed char smallint;
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197 | typedef unsigned char smalluint;
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198 | #else
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199 | /* for arches where byte accesses generate larger code: */
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200 | typedef int smallint;
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201 | typedef unsigned smalluint;
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202 | #endif
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203 |
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204 | /* ISO C Standard: 7.16 Boolean type and values <stdbool.h> */
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205 | #if (defined __digital__ && defined __unix__)
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206 | /* old system without (proper) C99 support */
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207 | #define bool smalluint
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208 | #else
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209 | /* modern system, so use it */
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210 | #include <stdbool.h>
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211 | #endif
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212 |
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213 | /* Try to defeat gcc's alignment of "char message[]"-like data */
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214 | #if 1 /* if needed: !defined(arch1) && !defined(arch2) */
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215 | #define ALIGN1 __attribute__((aligned(1)))
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216 | #define ALIGN2 __attribute__((aligned(2)))
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217 | #else
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218 | /* Arches which MUST have 2 or 4 byte alignment for everything are here */
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219 | #define ALIGN1
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220 | #define ALIGN2
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221 | #endif
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222 |
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223 |
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224 | /* uclibc does not implement daemon() for no-mmu systems.
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225 | * For 0.9.29 and svn, __ARCH_USE_MMU__ indicates no-mmu reliably.
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226 | * For earlier versions there is no reliable way to check if we are building
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227 | * for a mmu-less system; the user should pass EXTRA_CFLAGS="-DBB_NOMMU"
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228 | * on his own.
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229 | */
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230 | #if defined __UCLIBC__ && __UCLIBC_MAJOR__ >= 0 && __UCLIBC_MINOR__ >= 9 && \
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231 | __UCLIBC_SUBLEVEL__ > 28 && !defined __ARCH_USE_MMU__
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232 | #define BB_MMU 0
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233 | #define BB_NOMMU 1
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234 | #define USE_FOR_NOMMU(...) __VA_ARGS__
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235 | #define USE_FOR_MMU(...)
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236 | #else
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237 | #define BB_MMU 1
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238 | /* BB_NOMMU is not defined in this case! */
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239 | #define USE_FOR_NOMMU(...)
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240 | #define USE_FOR_MMU(...) __VA_ARGS__
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241 | #endif
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242 |
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243 | /* Platforms that haven't got dprintf need to implement fdprintf() in
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244 | * libbb. This would require a platform.c. It's not going to be cleaned
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245 | * out of the tree, so stop saying it should be. */
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246 | #if !defined(__dietlibc__)
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247 | /* Needed for: glibc */
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248 | /* Not needed for: dietlibc */
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249 | /* Others: ?? (add as needed) */
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250 | #define fdprintf dprintf
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251 | #endif
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252 |
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253 | #if defined(__dietlibc__)
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254 | static ALWAYS_INLINE char* strchrnul(const char *s, char c)
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255 | {
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256 | while (*s && *s != c) ++s;
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257 | return (char*)s;
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258 | }
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259 | #endif
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260 |
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261 | /* Don't use lchown with glibc older than 2.1.x ... uClibc lacks it */
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262 | #if (defined __GLIBC__ && __GLIBC__ <= 2 && __GLIBC_MINOR__ < 1) || \
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263 | defined __UC_LIBC__
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264 | # define lchown chown
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265 | #endif
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266 |
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267 | /* THIS SHOULD BE CLEANED OUT OF THE TREE ENTIRELY */
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268 | /* FIXME: fix tar.c! */
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269 | #ifndef FNM_LEADING_DIR
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270 | #define FNM_LEADING_DIR 0
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271 | #endif
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272 |
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273 | #if (defined __digital__ && defined __unix__)
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274 | #include <standards.h>
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275 | #define HAVE_STANDARDS_H
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276 | #include <inttypes.h>
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277 | #define HAVE_INTTYPES_H
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278 | #define PRIu32 "u"
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279 |
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280 | /* use legacy setpgrp(pid_t,pid_t) for now. move to platform.c */
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281 | #define bb_setpgrp() do { pid_t __me = getpid(); setpgrp(__me,__me); } while (0)
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282 |
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283 | #if !defined ADJ_OFFSET_SINGLESHOT && defined MOD_CLKA && defined MOD_OFFSET
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284 | #define ADJ_OFFSET_SINGLESHOT (MOD_CLKA | MOD_OFFSET)
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285 | #endif
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286 | #if !defined ADJ_FREQUENCY && defined MOD_FREQUENCY
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287 | #define ADJ_FREQUENCY MOD_FREQUENCY
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288 | #endif
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289 | #if !defined ADJ_TIMECONST && defined MOD_TIMECONST
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290 | #define ADJ_TIMECONST MOD_TIMECONST
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291 | #endif
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292 | #if !defined ADJ_TICK && defined MOD_CLKB
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293 | #define ADJ_TICK MOD_CLKB
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294 | #endif
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295 |
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296 | #else
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297 | #define bb_setpgrp() setpgrp()
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298 | #endif
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299 |
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300 | #if defined(__linux__)
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301 | #include <sys/mount.h>
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302 | /* Make sure we have all the new mount flags we actually try to use. */
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303 | #ifndef MS_BIND
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304 | #define MS_BIND (1<<12)
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305 | #endif
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306 | #ifndef MS_MOVE
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307 | #define MS_MOVE (1<<13)
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308 | #endif
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309 | #ifndef MS_RECURSIVE
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310 | #define MS_RECURSIVE (1<<14)
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311 | #endif
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312 | #ifndef MS_SILENT
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313 | #define MS_SILENT (1<<15)
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314 | #endif
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315 |
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316 | /* The shared subtree stuff, which went in around 2.6.15. */
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317 | #ifndef MS_UNBINDABLE
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318 | #define MS_UNBINDABLE (1<<17)
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319 | #endif
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320 | #ifndef MS_PRIVATE
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321 | #define MS_PRIVATE (1<<18)
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322 | #endif
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323 | #ifndef MS_SLAVE
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324 | #define MS_SLAVE (1<<19)
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325 | #endif
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326 | #ifndef MS_SHARED
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327 | #define MS_SHARED (1<<20)
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328 | #endif
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329 |
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330 |
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331 | #if !defined(BLKSSZGET)
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332 | #define BLKSSZGET _IO(0x12, 104)
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333 | #endif
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334 | #if !defined(BLKGETSIZE64)
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335 | #define BLKGETSIZE64 _IOR(0x12,114,size_t)
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336 | #endif
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337 | #endif
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338 |
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339 | #endif /* platform.h */
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