mirror of
https://github.com/sheumann/hush.git
synced 2024-08-27 03:29:05 +00:00
The locations *are* well-aligned for direct stores on any architecture. Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
517 lines
15 KiB
C
517 lines
15 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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*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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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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#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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/* "The malloc attribute is used to tell the compiler that a function
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* may be treated as if any non-NULL pointer it returns cannot alias
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* any other pointer valid when the function returns. This will often
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* improve optimization. Standard functions with this property include
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* malloc and calloc. realloc-like functions have this property as long
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* as the old pointer is never referred to (including comparing it
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* to the new pointer) after the function returns a non-NULL value."
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*/
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#define RETURNS_MALLOC __attribute__ ((malloc))
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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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/* At 4.4 gcc become much more anal about this, need to use "aliased" types */
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#if __GNUC_PREREQ(4,4)
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# define FIX_ALIASING __attribute__((__may_alias__))
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#else
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# define FIX_ALIASING
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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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/* 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) && !defined(__CYGWIN__)
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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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/* 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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/* ---- Endian Detection ------------------------------------ */
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#include <limits.h>
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#if defined(__digital__) && defined(__unix__)
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# include <sex.h>
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#elif defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) \
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|| defined(__APPLE__)
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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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#else
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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(__BYTE_ORDER) && __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 defined(__BYTE_ORDER) && __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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#elif defined(_BYTE_ORDER) && _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 defined(_BYTE_ORDER) && _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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#elif defined(BYTE_ORDER) && 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 defined(BYTE_ORDER) && 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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#elif defined(__386__)
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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 endianness"
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#endif
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#if ULONG_MAX > 0xffffffff
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# define bb_bswap_64(x) bswap_64(x)
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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) bb_bswap_64(x)
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# define IF_BIG_ENDIAN(...) __VA_ARGS__
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# define IF_LITTLE_ENDIAN(...)
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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) bb_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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# define IF_BIG_ENDIAN(...)
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# define IF_LITTLE_ENDIAN(...) __VA_ARGS__
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#endif
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/* ---- Unaligned access ------------------------------------ */
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#include <stdint.h>
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typedef int bb__aliased_int FIX_ALIASING;
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typedef long bb__aliased_long FIX_ALIASING;
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typedef uint16_t bb__aliased_uint16_t FIX_ALIASING;
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typedef uint32_t bb__aliased_uint32_t FIX_ALIASING;
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typedef uint64_t bb__aliased_uint64_t FIX_ALIASING;
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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__) || defined(__powerpc__)
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# define move_from_unaligned_int(v, intp) ((v) = *(bb__aliased_int*)(intp))
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# define move_from_unaligned_long(v, longp) ((v) = *(bb__aliased_long*)(longp))
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# define move_from_unaligned16(v, u16p) ((v) = *(bb__aliased_uint16_t*)(u16p))
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# define move_from_unaligned32(v, u32p) ((v) = *(bb__aliased_uint32_t*)(u32p))
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# define move_to_unaligned16(u16p, v) (*(bb__aliased_uint16_t*)(u16p) = (v))
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# define move_to_unaligned32(u32p, v) (*(bb__aliased_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_unaligned_int(v, intp) (memcpy(&(v), (intp), sizeof(int)))
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# define move_from_unaligned_long(v, longp) (memcpy(&(v), (longp), sizeof(long)))
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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_unaligned16(u16p, v) do { \
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uint16_t __t = (v); \
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memcpy((u16p), &__t, 2); \
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} while (0)
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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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/* ---- 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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/*----- Kernel versioning ------------------------------------*/
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#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
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#ifdef __UCLIBC__
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# define UCLIBC_VERSION KERNEL_VERSION(__UCLIBC_MAJOR__, __UCLIBC_MINOR__, __UCLIBC_SUBLEVEL__)
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#else
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# define UCLIBC_VERSION 0
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#endif
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/* ---- Miscellaneous --------------------------------------- */
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#if defined __GLIBC__ \
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|| defined __UCLIBC__ \
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|| defined __dietlibc__ \
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|| defined __BIONIC__ \
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|| defined _NEWLIB_VERSION
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# include <features.h>
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#endif
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/* Define bb_setpgrp */
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#if defined(__digital__) && defined(__unix__)
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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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#else
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# define bb_setpgrp() setpgrp()
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#endif
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/* fdprintf is more readable, we used it before dprintf was standardized */
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#include <unistd.h>
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#define fdprintf dprintf
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/* Useful for defeating gcc's alignment of "char message[]"-like data */
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#if !defined(__s390__)
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/* on s390[x], non-word-aligned data accesses require larger code */
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# define ALIGN1 __attribute__((aligned(1)))
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# define ALIGN2 __attribute__((aligned(2)))
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# define ALIGN4 __attribute__((aligned(4)))
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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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# define ALIGN4
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#endif
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/*
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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__ && \
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UCLIBC_VERSION > KERNEL_VERSION(0, 9, 28) && \
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!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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#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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# 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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#endif
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#if defined(__CYGWIN__)
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# define MAXSYMLINKS SYMLOOP_MAX
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#endif
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#if defined(ANDROID) || defined(__ANDROID__)
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# define BB_ADDITIONAL_PATH ":/system/sbin:/system/bin:/system/xbin"
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# define SYS_ioprio_set __NR_ioprio_set
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# define SYS_ioprio_get __NR_ioprio_get
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#endif
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/* ---- Who misses what? ------------------------------------ */
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/* Assume all these functions and header files exist by default.
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* Platforms where it is not true will #undef them below.
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*/
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#define HAVE_CLEARENV 1
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#define HAVE_FDATASYNC 1
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#define HAVE_DPRINTF 1
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#define HAVE_MEMRCHR 1
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#define HAVE_MKDTEMP 1
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#define HAVE_PTSNAME_R 1
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#define HAVE_SETBIT 1
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#define HAVE_SIGHANDLER_T 1
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#define HAVE_STPCPY 1
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|
#define HAVE_STRCASESTR 1
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#define HAVE_STRCHRNUL 1
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#define HAVE_STRSEP 1
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#define HAVE_STRSIGNAL 1
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#define HAVE_STRVERSCMP 1
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|
#define HAVE_VASPRINTF 1
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|
#define HAVE_UNLOCKED_STDIO 1
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|
#define HAVE_UNLOCKED_LINE_OPS 1
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|
#define HAVE_GETLINE 1
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|
#define HAVE_XTABS 1
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|
#define HAVE_MNTENT_H 1
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|
#define HAVE_NET_ETHERNET_H 1
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|
#define HAVE_SYS_STATFS_H 1
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#if defined(__UCLIBC__) && UCLIBC_VERSION < KERNEL_VERSION(0, 9, 32)
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# undef HAVE_STRVERSCMP
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#endif
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#if defined(__dietlibc__)
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# undef HAVE_STRCHRNUL
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|
#endif
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#if defined(__WATCOMC__)
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|
# undef HAVE_DPRINTF
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# undef HAVE_GETLINE
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|
# undef HAVE_MEMRCHR
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|
# undef HAVE_MKDTEMP
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# undef HAVE_SETBIT
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# undef HAVE_STPCPY
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# undef HAVE_STRCASESTR
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# undef HAVE_STRCHRNUL
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|
# undef HAVE_STRSEP
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# undef HAVE_STRSIGNAL
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# undef HAVE_STRVERSCMP
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|
# undef HAVE_VASPRINTF
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# undef HAVE_UNLOCKED_STDIO
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# undef HAVE_UNLOCKED_LINE_OPS
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# undef HAVE_NET_ETHERNET_H
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|
#endif
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#if defined(__CYGWIN__)
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# undef HAVE_CLEARENV
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# undef HAVE_FDPRINTF
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# undef HAVE_MEMRCHR
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# undef HAVE_PTSNAME_R
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# undef HAVE_STRVERSCMP
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# undef HAVE_UNLOCKED_LINE_OPS
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|
#endif
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/* These BSD-derived OSes share many similarities */
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|
#if (defined __digital__ && defined __unix__) \
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|| defined __APPLE__ \
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|| defined __FreeBSD__ || defined __OpenBSD__ || defined __NetBSD__
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|
# undef HAVE_CLEARENV
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|
# undef HAVE_FDATASYNC
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|
# undef HAVE_GETLINE
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|
# undef HAVE_MNTENT_H
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|
# undef HAVE_PTSNAME_R
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# undef HAVE_SYS_STATFS_H
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|
# undef HAVE_SIGHANDLER_T
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# undef HAVE_STRVERSCMP
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# undef HAVE_XTABS
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# undef HAVE_DPRINTF
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# undef HAVE_UNLOCKED_STDIO
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# undef HAVE_UNLOCKED_LINE_OPS
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#endif
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#if defined(__FreeBSD__)
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# undef HAVE_STRCHRNUL
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#endif
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#if defined(__NetBSD__)
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# define HAVE_GETLINE 1 /* Recent NetBSD versions have getline() */
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#endif
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#if defined(__digital__) && defined(__unix__)
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# undef HAVE_STPCPY
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#endif
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#if defined(ANDROID) || defined(__ANDROID__)
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# undef HAVE_DPRINTF
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# undef HAVE_GETLINE
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# undef HAVE_STPCPY
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# undef HAVE_STRCHRNUL
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# undef HAVE_STRVERSCMP
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# undef HAVE_UNLOCKED_LINE_OPS
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# undef HAVE_NET_ETHERNET_H
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#endif
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/*
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|
* Now, define prototypes for all the functions defined in platform.c
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|
* These must come after all the HAVE_* macros are defined (or not)
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|
*/
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|
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|
#ifndef HAVE_DPRINTF
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|
extern int dprintf(int fd, const char *format, ...);
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|
#endif
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#ifndef HAVE_MEMRCHR
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extern void *memrchr(const void *s, int c, size_t n) FAST_FUNC;
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#endif
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#ifndef HAVE_MKDTEMP
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extern char *mkdtemp(char *template) FAST_FUNC;
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#endif
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#ifndef HAVE_SETBIT
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# define setbit(a, b) ((a)[(b) >> 3] |= 1 << ((b) & 7))
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# define clrbit(a, b) ((a)[(b) >> 3] &= ~(1 << ((b) & 7)))
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#endif
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#ifndef HAVE_SIGHANDLER_T
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typedef void (*sighandler_t)(int);
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#endif
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#ifndef HAVE_STPCPY
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extern char *stpcpy(char *p, const char *to_add) FAST_FUNC;
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#endif
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#ifndef HAVE_STRCASESTR
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extern char *strcasestr(const char *s, const char *pattern) FAST_FUNC;
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#endif
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#ifndef HAVE_STRCHRNUL
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extern char *strchrnul(const char *s, int c) FAST_FUNC;
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#endif
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#ifndef HAVE_STRSEP
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extern char *strsep(char **stringp, const char *delim) FAST_FUNC;
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#endif
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|
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|
#ifndef HAVE_STRSIGNAL
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/* Not exactly the same: instead of "Stopped" it shows "STOP" etc */
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# define strsignal(sig) get_signame(sig)
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#endif
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#ifndef HAVE_VASPRINTF
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extern int vasprintf(char **string_ptr, const char *format, va_list p) FAST_FUNC;
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#endif
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#ifndef HAVE_GETLINE
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# include <stdio.h> /* for FILE */
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# include <sys/types.h> /* size_t */
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extern ssize_t getline(char **lineptr, size_t *n, FILE *stream) FAST_FUNC;
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#endif
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#endif
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