347 lines
10 KiB
C
347 lines
10 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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Copyright 2006, Bernhard Reutner-Fischer
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Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
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*/
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#ifndef BB_PLATFORM_H
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#define BB_PLATFORM_H 1
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/* Convenience macros to test the version of gcc. */
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#undef __GNUC_PREREQ
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#if defined __GNUC__ && defined __GNUC_MINOR__
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# define __GNUC_PREREQ(maj, min) \
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((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
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#else
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# define __GNUC_PREREQ(maj, min) 0
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#endif
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/* __restrict is known in EGCS 1.2 and above. */
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#if !__GNUC_PREREQ(2,92)
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# ifndef __restrict
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# define __restrict
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# endif
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#endif
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/* Define macros for some gcc attributes. This permits us to use the
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macros freely, and know that they will come into play for the
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version of gcc in which they are supported. */
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#if !__GNUC_PREREQ(2,7)
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# ifndef __attribute__
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# define __attribute__(x)
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# endif
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#endif
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#undef inline
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#if defined(__STDC_VERSION__) && __STDC_VERSION__ > 199901L
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/* it's a keyword */
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#elif __GNUC_PREREQ(2,7)
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# define inline __inline__
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#else
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# define inline
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#endif
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#ifndef __const
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# define __const const
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#endif
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#define UNUSED_PARAM __attribute__ ((__unused__))
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#define NORETURN __attribute__ ((__noreturn__))
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#define PACKED __attribute__ ((__packed__))
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#define ALIGNED(m) __attribute__ ((__aligned__(m)))
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/* __NO_INLINE__: some gcc's do not honor inlining! :( */
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#if __GNUC_PREREQ(3,0) && !defined(__NO_INLINE__)
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# define ALWAYS_INLINE __attribute__ ((always_inline)) inline
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/* I've seen a toolchain where I needed __noinline__ instead of noinline */
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# define NOINLINE __attribute__((__noinline__))
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# if !ENABLE_WERROR
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# define DEPRECATED __attribute__ ((__deprecated__))
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# define UNUSED_PARAM_RESULT __attribute__ ((warn_unused_result))
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# else
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# define DEPRECATED
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# define UNUSED_PARAM_RESULT
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# endif
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#else
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# define ALWAYS_INLINE inline
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# define NOINLINE
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# define DEPRECATED
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# define UNUSED_PARAM_RESULT
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#endif
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/* -fwhole-program makes all symbols local. The attribute externally_visible
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forces a symbol global. */
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#if __GNUC_PREREQ(4,1)
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# define EXTERNALLY_VISIBLE __attribute__(( visibility("default") ))
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//__attribute__ ((__externally_visible__))
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#else
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# define EXTERNALLY_VISIBLE
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#endif
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/* We use __extension__ in some places to suppress -pedantic warnings
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about GCC extensions. This feature didn't work properly before
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gcc 2.8. */
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#if !__GNUC_PREREQ(2,8)
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# ifndef __extension__
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# define __extension__
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# endif
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#endif
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/* gcc-2.95 had no va_copy but only __va_copy. */
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#if !__GNUC_PREREQ(3,0)
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# include <stdarg.h>
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# if !defined va_copy && defined __va_copy
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# define va_copy(d,s) __va_copy((d),(s))
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# endif
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#endif
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/* FAST_FUNC is a qualifier which (possibly) makes function call faster
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* and/or smaller by using modified ABI. It is usually only needed
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* on non-static, busybox internal functions. Recent versions of gcc
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* optimize statics automatically. FAST_FUNC on static is required
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* only if you need to match a function pointer's type */
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#if __GNUC_PREREQ(3,0) && defined(i386) /* || defined(__x86_64__)? */
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/* stdcall makes callee to pop arguments from stack, not caller */
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# define FAST_FUNC __attribute__((regparm(3),stdcall))
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/* #elif ... - add your favorite arch today! */
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#else
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# define FAST_FUNC
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#endif
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/* Make all declarations hidden (-fvisibility flag only affects definitions) */
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/* (don't include system headers after this until corresponding pop!) */
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#if __GNUC_PREREQ(4,1)
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# define PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN _Pragma("GCC visibility push(hidden)")
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# define POP_SAVED_FUNCTION_VISIBILITY _Pragma("GCC visibility pop")
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#else
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# define PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN
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# define POP_SAVED_FUNCTION_VISIBILITY
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#endif
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/* ---- Endian Detection ------------------------------------ */
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#if defined(__digital__) && defined(__unix__)
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# include <sex.h>
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# define __BIG_ENDIAN__ (BYTE_ORDER == BIG_ENDIAN)
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# define __BYTE_ORDER BYTE_ORDER
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#elif defined __FreeBSD__
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char *strchrnul(const char *s, int c);
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# include <sys/resource.h> /* rlimit */
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# include <machine/endian.h>
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# define bswap_64 __bswap64
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# define bswap_32 __bswap32
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# define bswap_16 __bswap16
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# define __BIG_ENDIAN__ (_BYTE_ORDER == _BIG_ENDIAN)
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#elif !defined __APPLE__
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# include <byteswap.h>
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# include <endian.h>
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#endif
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#if defined(__BIG_ENDIAN__) && __BIG_ENDIAN__
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# define BB_BIG_ENDIAN 1
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# define BB_LITTLE_ENDIAN 0
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#elif __BYTE_ORDER == __BIG_ENDIAN
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# define BB_BIG_ENDIAN 1
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# define BB_LITTLE_ENDIAN 0
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#elif __BYTE_ORDER == __LITTLE_ENDIAN
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# define BB_BIG_ENDIAN 0
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# define BB_LITTLE_ENDIAN 1
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#else
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# error "Can't determine endiannes"
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#endif
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/* SWAP_LEnn means "convert CPU<->little_endian by swapping bytes" */
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#if BB_BIG_ENDIAN
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# define SWAP_BE16(x) (x)
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# define SWAP_BE32(x) (x)
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# define SWAP_BE64(x) (x)
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# define SWAP_LE16(x) bswap_16(x)
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# define SWAP_LE32(x) bswap_32(x)
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# define SWAP_LE64(x) bswap_64(x)
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#else
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# define SWAP_BE16(x) bswap_16(x)
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# define SWAP_BE32(x) bswap_32(x)
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# define SWAP_BE64(x) bswap_64(x)
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# define SWAP_LE16(x) (x)
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# define SWAP_LE32(x) (x)
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# define SWAP_LE64(x) (x)
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#endif
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/* ---- Unaligned access ------------------------------------ */
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/* NB: unaligned parameter should be a pointer, aligned one -
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* a lvalue. This makes it more likely to not swap them by mistake
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*/
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#if defined(i386) || defined(__x86_64__)
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# define move_from_unaligned16(v, u16p) ((v) = *(uint16_t*)(u16p))
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# define move_from_unaligned32(v, u32p) ((v) = *(uint32_t*)(u32p))
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# define move_to_unaligned32(u32p, v) (*(uint32_t*)(u32p) = (v))
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/* #elif ... - add your favorite arch today! */
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#else
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/* performs reasonably well (gcc usually inlines memcpy here) */
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# define move_from_unaligned16(v, u16p) (memcpy(&(v), (u16p), 2))
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# define move_from_unaligned32(v, u32p) (memcpy(&(v), (u32p), 4))
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# define move_to_unaligned32(u32p, v) do { \
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uint32_t __t = (v); \
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memcpy((u32p), &__t, 4); \
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} while (0)
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#endif
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/* ---- Networking ------------------------------------------ */
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#ifndef __APPLE__
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# include <arpa/inet.h>
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# if !defined(__socklen_t_defined) && !defined(_SOCKLEN_T_DECLARED)
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typedef int socklen_t;
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# endif
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#else
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# include <netinet/in.h>
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#endif
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/* ---- Compiler dependent settings ------------------------- */
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#if (defined __digital__ && defined __unix__) \
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|| defined __APPLE__ || defined __FreeBSD__
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# undef HAVE_MNTENT_H
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# undef HAVE_SYS_STATFS_H
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#else
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# define HAVE_MNTENT_H 1
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# define HAVE_SYS_STATFS_H 1
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#endif
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/*----- Kernel versioning ------------------------------------*/
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#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
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/* ---- Miscellaneous --------------------------------------- */
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#if defined(__GNU_LIBRARY__) && __GNU_LIBRARY__ < 5 && \
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!defined(__dietlibc__) && \
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!defined(_NEWLIB_VERSION) && \
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!(defined __digital__ && defined __unix__)
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# error "Sorry, this libc version is not supported :("
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#endif
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/* Don't perpetuate e2fsck crap into the headers. Clean up e2fsck instead. */
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#if defined __GLIBC__ || defined __UCLIBC__ \
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|| defined __dietlibc__ || defined _NEWLIB_VERSION
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# include <features.h>
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# define HAVE_FEATURES_H
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# include <stdint.h>
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# define HAVE_STDINT_H
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#elif !defined __APPLE__
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/* Largest integral types. */
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# if BB_BIG_ENDIAN
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/* Looks BROKEN! */
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typedef long intmax_t;
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typedef unsigned long uintmax_t;
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# else
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__extension__
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typedef long long intmax_t;
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__extension__
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typedef unsigned long long uintmax_t;
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# endif
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#endif
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/* Size-saving "small" ints (arch-dependent) */
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#if defined(i386) || defined(__x86_64__) || defined(__mips__) || defined(__cris__)
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/* add other arches which benefit from this... */
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typedef signed char smallint;
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typedef unsigned char smalluint;
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#else
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/* for arches where byte accesses generate larger code: */
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typedef int smallint;
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typedef unsigned smalluint;
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#endif
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/* ISO C Standard: 7.16 Boolean type and values <stdbool.h> */
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#if (defined __digital__ && defined __unix__)
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/* old system without (proper) C99 support */
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# define bool smalluint
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#else
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/* modern system, so use it */
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# include <stdbool.h>
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#endif
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/* Try to defeat gcc's alignment of "char message[]"-like data */
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#if 1 /* if needed: !defined(arch1) && !defined(arch2) */
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# define ALIGN1 __attribute__((aligned(1)))
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# define ALIGN2 __attribute__((aligned(2)))
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#else
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/* Arches which MUST have 2 or 4 byte alignment for everything are here */
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# define ALIGN1
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# define ALIGN2
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#endif
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/* uclibc does not implement daemon() for no-mmu systems.
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* For 0.9.29 and svn, __ARCH_USE_MMU__ indicates no-mmu reliably.
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* For earlier versions there is no reliable way to check if we are building
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* for a mmu-less system.
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*/
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#if ENABLE_NOMMU || \
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(defined __UCLIBC__ && __UCLIBC_MAJOR__ >= 0 && __UCLIBC_MINOR__ >= 9 && \
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__UCLIBC_SUBLEVEL__ > 28 && !defined __ARCH_USE_MMU__)
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# define BB_MMU 0
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# define USE_FOR_NOMMU(...) __VA_ARGS__
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# define USE_FOR_MMU(...)
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#else
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# define BB_MMU 1
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# define USE_FOR_NOMMU(...)
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# define USE_FOR_MMU(...) __VA_ARGS__
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#endif
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/* Platforms that haven't got dprintf need to implement fdprintf() in
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* libbb. This would require a platform.c. It's not going to be cleaned
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* out of the tree, so stop saying it should be. */
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#if !defined(__dietlibc__)
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/* Needed for: glibc */
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/* Not needed for: dietlibc */
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/* Others: ?? (add as needed) */
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# define fdprintf dprintf
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#endif
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#if defined(__dietlibc__)
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static ALWAYS_INLINE char* strchrnul(const char *s, char c)
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{
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while (*s && *s != c) ++s;
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return (char*)s;
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}
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#endif
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/* Don't use lchown with glibc older than 2.1.x */
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#if defined(__GLIBC__) && __GLIBC__ <= 2 && __GLIBC_MINOR__ < 1
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# define lchown chown
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#endif
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#if defined(__digital__) && defined(__unix__)
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# include <standards.h>
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# include <inttypes.h>
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# define PRIu32 "u"
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/* use legacy setpgrp(pid_t,pid_t) for now. move to platform.c */
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# define bb_setpgrp() do { pid_t __me = getpid(); setpgrp(__me,__me); } while (0)
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# if !defined ADJ_OFFSET_SINGLESHOT && defined MOD_CLKA && defined MOD_OFFSET
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# define ADJ_OFFSET_SINGLESHOT (MOD_CLKA | MOD_OFFSET)
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# endif
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# if !defined ADJ_FREQUENCY && defined MOD_FREQUENCY
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# define ADJ_FREQUENCY MOD_FREQUENCY
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# endif
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# if !defined ADJ_TIMECONST && defined MOD_TIMECONST
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# define ADJ_TIMECONST MOD_TIMECONST
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# endif
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# if !defined ADJ_TICK && defined MOD_CLKB
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# define ADJ_TICK MOD_CLKB
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# endif
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#else
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# define bb_setpgrp() setpgrp()
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#endif
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#endif
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