| 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 | # define HAVE_SYS_STATFS_H 1
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| 259 | #endif
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| 260 |
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| 261 | /*----- Kernel versioning ------------------------------------*/
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| 262 |
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| 263 | #define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
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| 264 |
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| 265 | /* ---- Miscellaneous --------------------------------------- */
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| 266 |
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| 267 | #if defined __GLIBC__ || defined __UCLIBC__ \
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| 268 | || defined __dietlibc__ || defined _NEWLIB_VERSION
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| 269 | # include <features.h>
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| 270 | #endif
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| 271 |
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| 272 | /* Size-saving "small" ints (arch-dependent) */
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| 273 | #if defined(i386) || defined(__x86_64__) || defined(__mips__) || defined(__cris__)
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| 274 | /* add other arches which benefit from this... */
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| 275 | typedef signed char smallint;
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| 276 | typedef unsigned char smalluint;
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| 277 | #else
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| 278 | /* for arches where byte accesses generate larger code: */
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| 279 | typedef int smallint;
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| 280 | typedef unsigned smalluint;
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| 281 | #endif
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| 282 |
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| 283 | /* ISO C Standard: 7.16 Boolean type and values <stdbool.h> */
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| 284 | #if (defined __digital__ && defined __unix__)
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| 285 | /* old system without (proper) C99 support */
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| 286 | # define bool smalluint
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| 287 | #else
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| 288 | /* modern system, so use it */
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| 289 | # include <stdbool.h>
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| 290 | #endif
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| 291 |
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| 292 | /* Try to defeat gcc's alignment of "char message[]"-like data */
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| 293 | #if 1 /* if needed: !defined(arch1) && !defined(arch2) */
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| 294 | # define ALIGN1 __attribute__((aligned(1)))
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| 295 | # define ALIGN2 __attribute__((aligned(2)))
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| 296 | # define ALIGN4 __attribute__((aligned(4)))
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| 297 | #else
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| 298 | /* Arches which MUST have 2 or 4 byte alignment for everything are here */
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| 299 | # define ALIGN1
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| 300 | # define ALIGN2
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| 301 | # define ALIGN4
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| 302 | #endif
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| 303 |
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| 304 |
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| 305 | /* uclibc does not implement daemon() for no-mmu systems.
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| 306 | * For 0.9.29 and svn, __ARCH_USE_MMU__ indicates no-mmu reliably.
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| 307 | * For earlier versions there is no reliable way to check if we are building
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| 308 | * for a mmu-less system.
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| 309 | */
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| 310 | #if ENABLE_NOMMU || \
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| 311 | (defined __UCLIBC__ && __UCLIBC_MAJOR__ >= 0 && __UCLIBC_MINOR__ >= 9 && \
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| 312 | __UCLIBC_SUBLEVEL__ > 28 && !defined __ARCH_USE_MMU__)
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| 313 | # define BB_MMU 0
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| 314 | # define USE_FOR_NOMMU(...) __VA_ARGS__
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| 315 | # define USE_FOR_MMU(...)
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| 316 | #else
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| 317 | # define BB_MMU 1
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| 318 | # define USE_FOR_NOMMU(...)
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| 319 | # define USE_FOR_MMU(...) __VA_ARGS__
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| 320 | #endif
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| 321 |
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| 322 | /* Don't use lchown with glibc older than 2.1.x */
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| 323 | #if defined(__GLIBC__) && __GLIBC__ <= 2 && __GLIBC_MINOR__ < 1
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| 324 | # define lchown chown
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| 325 | #endif
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| 326 |
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| 327 | #if defined(__digital__) && defined(__unix__)
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| 328 |
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| 329 | # include <standards.h>
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| 330 | # include <inttypes.h>
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| 331 | # define PRIu32 "u"
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| 332 | /* use legacy setpgrp(pid_t,pid_t) for now. move to platform.c */
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| 333 | # define bb_setpgrp() do { pid_t __me = getpid(); setpgrp(__me, __me); } while (0)
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| 334 | # if !defined ADJ_OFFSET_SINGLESHOT && defined MOD_CLKA && defined MOD_OFFSET
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| 335 | # define ADJ_OFFSET_SINGLESHOT (MOD_CLKA | MOD_OFFSET)
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| 336 | # endif
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| 337 | # if !defined ADJ_FREQUENCY && defined MOD_FREQUENCY
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| 338 | # define ADJ_FREQUENCY MOD_FREQUENCY
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| 339 | # endif
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| 340 | # if !defined ADJ_TIMECONST && defined MOD_TIMECONST
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| 341 | # define ADJ_TIMECONST MOD_TIMECONST
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| 342 | # endif
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| 343 | # if !defined ADJ_TICK && defined MOD_CLKB
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| 344 | # define ADJ_TICK MOD_CLKB
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| 345 | # endif
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| 346 |
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| 347 | #else
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| 348 |
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| 349 | # define bb_setpgrp() setpgrp()
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| 350 |
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| 351 | #endif
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| 352 |
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| 353 | #if defined(__GLIBC__)
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| 354 | # define fdprintf dprintf
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| 355 | #endif
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| 356 |
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| 357 | #if defined(__dietlibc__)
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| 358 | # undef HAVE_STRCHRNUL
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| 359 | #endif
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| 360 |
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| 361 | #if defined(__WATCOMC__)
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| 362 | # undef HAVE_FDPRINTF
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| 363 | # undef HAVE_MEMRCHR
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| 364 | # undef HAVE_MKDTEMP
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| 365 | # undef HAVE_SETBIT
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| 366 | # undef HAVE_STRCASESTR
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| 367 | # undef HAVE_STRCHRNUL
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| 368 | # undef HAVE_STRSEP
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| 369 | # undef HAVE_STRSIGNAL
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| 370 | # undef HAVE_VASPRINTF
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| 371 | #endif
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| 372 |
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| 373 | #if defined(__FreeBSD__)
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| 374 | # undef HAVE_STRCHRNUL
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| 375 | #endif
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| 376 |
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| 377 | /*
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| 378 | * Now, define prototypes for all the functions defined in platform.c
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| 379 | * These must come after all the HAVE_* macros are defined (or not)
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| 380 | */
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| 381 |
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| 382 | #ifndef HAVE_FDPRINTF
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| 383 | extern int fdprintf(int fd, const char *format, ...);
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| 384 | #endif
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| 385 |
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| 386 | #ifndef HAVE_MEMRCHR
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| 387 | extern void *memrchr(const void *s, int c, size_t n) FAST_FUNC;
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| 388 | #endif
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| 389 |
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| 390 | #ifndef HAVE_MKDTEMP
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| 391 | extern char *mkdtemp(char *template) FAST_FUNC;
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| 392 | #endif
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| 393 |
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| 394 | #ifndef HAVE_SETBIT
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| 395 | # define setbit(a, b) ((a)[(b) >> 3] |= 1 << ((b) & 7))
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| 396 | # define clrbit(a, b) ((a)[(b) >> 3] &= ~(1 << ((b) & 7)))
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| 397 | #endif
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| 398 |
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| 399 | #ifndef HAVE_STRCASESTR
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| 400 | extern char *strcasestr(const char *s, const char *pattern) FAST_FUNC;
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| 401 | #endif
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| 402 |
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| 403 | #ifndef HAVE_STRCHRNUL
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| 404 | extern char *strchrnul(const char *s, int c) FAST_FUNC;
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| 405 | #endif
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| 406 |
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| 407 | #ifndef HAVE_STRSEP
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| 408 | extern char *strsep(char **stringp, const char *delim) FAST_FUNC;
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| 409 | #endif
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| 410 |
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| 411 | #ifndef HAVE_STRSIGNAL
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| 412 | /* Not exactly the same: instead of "Stopped" it shows "STOP" etc */
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| 413 | # define strsignal(sig) get_signame(sig)
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| 414 | #endif
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| 415 |
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| 416 | #ifndef HAVE_VASPRINTF
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| 417 | extern int vasprintf(char **string_ptr, const char *format, va_list p) FAST_FUNC;
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| 418 | #endif
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| 419 |
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| 420 | #endif
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