/* vi: set sw=4 ts=4: */
/*
- Copyright 2006, Bernhard Fischer
+ * Copyright 2006, Bernhard Reutner-Fischer
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
+ */
+#ifndef BB_PLATFORM_H
+#define BB_PLATFORM_H 1
- Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
-*/
-#ifndef __PLATFORM_H
-#define __PLATFORM_H 1
/* Convenience macros to test the version of gcc. */
#undef __GNUC_PREREQ
#if defined __GNUC__ && defined __GNUC_MINOR__
# define __GNUC_PREREQ(maj, min) \
- ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
+ ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
#else
# define __GNUC_PREREQ(maj, min) 0
#endif
/* __restrict is known in EGCS 1.2 and above. */
-#if !__GNUC_PREREQ (2,92)
+#if !__GNUC_PREREQ(2,92)
# ifndef __restrict
-# define __restrict /* Ignore */
+# define __restrict
# endif
#endif
-/* Define macros for some gcc attributes. This permits us to use the
- macros freely, and know that they will come into play for the
- version of gcc in which they are supported. */
-
-#if !__GNUC_PREREQ (2,7)
+#if !__GNUC_PREREQ(2,7)
# ifndef __attribute__
# define __attribute__(x)
# endif
#endif
#undef inline
-#if __STDC_VERSION__ > 199901L
+#if defined(__STDC_VERSION__) && __STDC_VERSION__ > 199901L
/* it's a keyword */
+#elif __GNUC_PREREQ(2,7)
+# define inline __inline__
#else
-# if __GNUC_PREREQ (2,7)
-# define inline __inline__
-# else
-# define inline
-# endif
+# define inline
#endif
#ifndef __const
# define __const const
#endif
-# define ATTRIBUTE_UNUSED __attribute__ ((__unused__))
-# define ATTRIBUTE_NORETURN __attribute__ ((__noreturn__))
-# define ATTRIBUTE_PACKED __attribute__ ((__packed__))
-# define ATTRIBUTE_ALIGNED(m) __attribute__ ((__aligned__(m)))
-# if __GNUC_PREREQ (3,0)
-# define ATTRIBUTE_ALWAYS_INLINE __attribute__ ((always_inline)) inline
+#define UNUSED_PARAM __attribute__ ((__unused__))
+#define NORETURN __attribute__ ((__noreturn__))
+/* "The malloc attribute is used to tell the compiler that a function
+ * may be treated as if any non-NULL pointer it returns cannot alias
+ * any other pointer valid when the function returns. This will often
+ * improve optimization. Standard functions with this property include
+ * malloc and calloc. realloc-like functions have this property as long
+ * as the old pointer is never referred to (including comparing it
+ * to the new pointer) after the function returns a non-NULL value."
+ */
+#define RETURNS_MALLOC __attribute__ ((malloc))
+#define PACKED __attribute__ ((__packed__))
+#define ALIGNED(m) __attribute__ ((__aligned__(m)))
+
+/* __NO_INLINE__: some gcc's do not honor inlining! :( */
+#if __GNUC_PREREQ(3,0) && !defined(__NO_INLINE__)
+# define ALWAYS_INLINE __attribute__ ((always_inline)) inline
+/* I've seen a toolchain where I needed __noinline__ instead of noinline */
+# define NOINLINE __attribute__((__noinline__))
+# if !ENABLE_WERROR
+# define DEPRECATED __attribute__ ((__deprecated__))
+# define UNUSED_PARAM_RESULT __attribute__ ((warn_unused_result))
# else
-# define ATTRIBUTE_ALWAYS_INLINE inline
+# define DEPRECATED
+# define UNUSED_PARAM_RESULT
# endif
+#else
+# define ALWAYS_INLINE inline
+# define NOINLINE
+# define DEPRECATED
+# define UNUSED_PARAM_RESULT
+#endif
/* -fwhole-program makes all symbols local. The attribute externally_visible
- forces a symbol global. */
-# if __GNUC_PREREQ (4,1)
-# define ATTRIBUTE_EXTERNALLY_VISIBLE __attribute__ ((__externally_visible__))
-# else
-# define ATTRIBUTE_EXTERNALLY_VISIBLE
-# endif /* GNUC >= 4.1 */
+ * forces a symbol global. */
+#if __GNUC_PREREQ(4,1)
+# define EXTERNALLY_VISIBLE __attribute__(( visibility("default") ))
+//__attribute__ ((__externally_visible__))
+#else
+# define EXTERNALLY_VISIBLE
+#endif
+
+/* At 4.4 gcc become much more anal about this, need to use "aliased" types */
+#if __GNUC_PREREQ(4,4)
+# define FIX_ALIASING __attribute__((__may_alias__))
+#else
+# define FIX_ALIASING
+#endif
/* We use __extension__ in some places to suppress -pedantic warnings
- about GCC extensions. This feature didn't work properly before
- gcc 2.8. */
-#if !__GNUC_PREREQ (2,8)
+ * about GCC extensions. This feature didn't work properly before
+ * gcc 2.8. */
+#if !__GNUC_PREREQ(2,8)
# ifndef __extension__
# define __extension__
# endif
#endif
+/* FAST_FUNC is a qualifier which (possibly) makes function call faster
+ * and/or smaller by using modified ABI. It is usually only needed
+ * on non-static, busybox internal functions. Recent versions of gcc
+ * optimize statics automatically. FAST_FUNC on static is required
+ * only if you need to match a function pointer's type */
+#if __GNUC_PREREQ(3,0) && defined(i386) /* || defined(__x86_64__)? */
+/* stdcall makes callee to pop arguments from stack, not caller */
+# define FAST_FUNC __attribute__((regparm(3),stdcall))
+/* #elif ... - add your favorite arch today! */
+#else
+# define FAST_FUNC
+#endif
+
+/* Make all declarations hidden (-fvisibility flag only affects definitions) */
+/* (don't include system headers after this until corresponding pop!) */
+#if __GNUC_PREREQ(4,1)
+# define PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN _Pragma("GCC visibility push(hidden)")
+# define POP_SAVED_FUNCTION_VISIBILITY _Pragma("GCC visibility pop")
+#else
+# define PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN
+# define POP_SAVED_FUNCTION_VISIBILITY
+#endif
+
+/* gcc-2.95 had no va_copy but only __va_copy. */
+#if !__GNUC_PREREQ(3,0)
+# include <stdarg.h>
+# if !defined va_copy && defined __va_copy
+# define va_copy(d,s) __va_copy((d),(s))
+# endif
+#endif
+
+
/* ---- Endian Detection ------------------------------------ */
-#if (defined __digital__ && defined __unix__)
+#include <limits.h>
+#if defined(__digital__) && defined(__unix__)
# include <sex.h>
-# define __BIG_ENDIAN__ (BYTE_ORDER == BIG_ENDIAN)
-# define __BYTE_ORDER BYTE_ORDER
-#elif !defined __APPLE__
+#elif defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) \
+ || defined(__APPLE__)
+# include <sys/resource.h> /* rlimit */
+# include <machine/endian.h>
+# define bswap_64 __bswap64
+# define bswap_32 __bswap32
+# define bswap_16 __bswap16
+#else
# include <byteswap.h>
# include <endian.h>
#endif
-#ifdef __BIG_ENDIAN__
+#if defined(__BYTE_ORDER) && __BYTE_ORDER == __BIG_ENDIAN
# define BB_BIG_ENDIAN 1
# define BB_LITTLE_ENDIAN 0
-#elif __BYTE_ORDER == __BIG_ENDIAN
+#elif defined(__BYTE_ORDER) && __BYTE_ORDER == __LITTLE_ENDIAN
+# define BB_BIG_ENDIAN 0
+# define BB_LITTLE_ENDIAN 1
+#elif defined(_BYTE_ORDER) && _BYTE_ORDER == _BIG_ENDIAN
# define BB_BIG_ENDIAN 1
# define BB_LITTLE_ENDIAN 0
-#else
+#elif defined(_BYTE_ORDER) && _BYTE_ORDER == _LITTLE_ENDIAN
+# define BB_BIG_ENDIAN 0
+# define BB_LITTLE_ENDIAN 1
+#elif defined(BYTE_ORDER) && BYTE_ORDER == BIG_ENDIAN
+# define BB_BIG_ENDIAN 1
+# define BB_LITTLE_ENDIAN 0
+#elif defined(BYTE_ORDER) && BYTE_ORDER == LITTLE_ENDIAN
+# define BB_BIG_ENDIAN 0
+# define BB_LITTLE_ENDIAN 1
+#elif defined(__386__)
# define BB_BIG_ENDIAN 0
# define BB_LITTLE_ENDIAN 1
+#else
+# error "Can't determine endianness"
+#endif
+
+#if ULONG_MAX > 0xffffffff
+# define bb_bswap_64(x) bswap_64(x)
#endif
+/* SWAP_LEnn means "convert CPU<->little_endian by swapping bytes" */
#if BB_BIG_ENDIAN
-#define SWAP_BE16(x) (x)
-#define SWAP_BE32(x) (x)
-#define SWAP_BE64(x) (x)
-#define SWAP_LE16(x) bswap_16(x)
-#define SWAP_LE32(x) bswap_32(x)
-#define SWAP_LE64(x) bswap_64(x)
+# define SWAP_BE16(x) (x)
+# define SWAP_BE32(x) (x)
+# define SWAP_BE64(x) (x)
+# define SWAP_LE16(x) bswap_16(x)
+# define SWAP_LE32(x) bswap_32(x)
+# define SWAP_LE64(x) bb_bswap_64(x)
+# define IF_BIG_ENDIAN(...) __VA_ARGS__
+# define IF_LITTLE_ENDIAN(...)
#else
-#define SWAP_BE16(x) bswap_16(x)
-#define SWAP_BE32(x) bswap_32(x)
-#define SWAP_BE64(x) bswap_64(x)
-#define SWAP_LE16(x) (x)
-#define SWAP_LE32(x) (x)
-#define SWAP_LE64(x) (x)
+# define SWAP_BE16(x) bswap_16(x)
+# define SWAP_BE32(x) bswap_32(x)
+# define SWAP_BE64(x) bb_bswap_64(x)
+# define SWAP_LE16(x) (x)
+# define SWAP_LE32(x) (x)
+# define SWAP_LE64(x) (x)
+# define IF_BIG_ENDIAN(...)
+# define IF_LITTLE_ENDIAN(...) __VA_ARGS__
#endif
-/* ---- Networking ------------------------------------------ */
-#ifndef __APPLE__
-# include <arpa/inet.h>
+
+/* ---- Unaligned access ------------------------------------ */
+
+#include <stdint.h>
+typedef int bb__aliased_int FIX_ALIASING;
+typedef uint16_t bb__aliased_uint16_t FIX_ALIASING;
+typedef uint32_t bb__aliased_uint32_t FIX_ALIASING;
+
+/* NB: unaligned parameter should be a pointer, aligned one -
+ * a lvalue. This makes it more likely to not swap them by mistake
+ */
+#if defined(i386) || defined(__x86_64__) || defined(__powerpc__)
+# define move_from_unaligned_int(v, intp) ((v) = *(bb__aliased_int*)(intp))
+# define move_from_unaligned16(v, u16p) ((v) = *(bb__aliased_uint16_t*)(u16p))
+# define move_from_unaligned32(v, u32p) ((v) = *(bb__aliased_uint32_t*)(u32p))
+# define move_to_unaligned16(u16p, v) (*(bb__aliased_uint16_t*)(u16p) = (v))
+# define move_to_unaligned32(u32p, v) (*(bb__aliased_uint32_t*)(u32p) = (v))
+/* #elif ... - add your favorite arch today! */
#else
-# include <netinet/in.h>
+/* performs reasonably well (gcc usually inlines memcpy here) */
+# define move_from_unaligned_int(v, intp) (memcpy(&(v), (intp), sizeof(int)))
+# define move_from_unaligned16(v, u16p) (memcpy(&(v), (u16p), 2))
+# define move_from_unaligned32(v, u32p) (memcpy(&(v), (u32p), 4))
+# define move_to_unaligned16(u16p, v) do { \
+ uint16_t __t = (v); \
+ memcpy((u16p), &__t, 4); \
+} while (0)
+# define move_to_unaligned32(u32p, v) do { \
+ uint32_t __t = (v); \
+ memcpy((u32p), &__t, 4); \
+} while (0)
#endif
-#ifndef __socklen_t_defined
-typedef int socklen_t;
-#endif
-/* ---- Compiler dependent settings ------------------------- */
-#ifndef __GNUC__
-#if defined __INTEL_COMPILER
-__extension__ typedef __signed__ long long __s64;
-__extension__ typedef unsigned long long __u64;
-#endif /* __INTEL_COMPILER */
-#endif /* ifndef __GNUC__ */
+/* ---- Size-saving "small" ints (arch-dependent) ----------- */
+#if defined(i386) || defined(__x86_64__) || defined(__mips__) || defined(__cris__)
+/* add other arches which benefit from this... */
+typedef signed char smallint;
+typedef unsigned char smalluint;
+#else
+/* for arches where byte accesses generate larger code: */
+typedef int smallint;
+typedef unsigned smalluint;
+#endif
+
+/* ISO C Standard: 7.16 Boolean type and values <stdbool.h> */
#if (defined __digital__ && defined __unix__)
-# undef HAVE_MNTENT_H
+/* old system without (proper) C99 support */
+# define bool smalluint
#else
-# define HAVE_MNTENT_H 1
-#endif /* ___digital__ && __unix__ */
+/* modern system, so use it */
+# include <stdbool.h>
+#endif
+
/*----- Kernel versioning ------------------------------------*/
+
#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
-/* ---- miscellaneous --------------------------------------- */
-#if defined(__GNU_LIBRARY__) && __GNU_LIBRARY__ < 5 && \
- !defined(__dietlibc__) && \
- !defined(_NEWLIB_VERSION) && \
- !(defined __digital__ && defined __unix__)
-# error "Sorry, this libc version is not supported :("
-#endif
+/* ---- Miscellaneous --------------------------------------- */
-// Don't perpetuate e2fsck crap into the headers. Clean up e2fsck instead.
+#if defined __GLIBC__ \
+ || defined __UCLIBC__ \
+ || defined __dietlibc__ \
+ || defined _NEWLIB_VERSION
+# include <features.h>
+#endif
-#if defined __GLIBC__ || defined __UCLIBC__ \
- || defined __dietlibc__ || defined _NEWLIB_VERSION
-#include <features.h>
-#define HAVE_FEATURES_H
-#include <stdint.h>
-#define HAVE_STDINT_H
+/* Define bb_setpgrp */
+#if defined(__digital__) && defined(__unix__)
+/* use legacy setpgrp(pid_t, pid_t) for now. move to platform.c */
+# define bb_setpgrp() do { pid_t __me = getpid(); setpgrp(__me, __me); } while (0)
#else
-/* Largest integral types. */
-#if __BIG_ENDIAN__
-typedef long int intmax_t;
-typedef unsigned long int uintmax_t;
-#else
-__extension__
-typedef long long int intmax_t;
-__extension__
-typedef unsigned long long int uintmax_t;
+# define bb_setpgrp() setpgrp()
#endif
+
+/* fdprintf is more readable, we used it before dprintf was standardized */
+#include <unistd.h>
+#define fdprintf dprintf
+
+/* Useful for defeating gcc's alignment of "char message[]"-like data */
+#if 1 /* if needed: !defined(arch1) && !defined(arch2) */
+# define ALIGN1 __attribute__((aligned(1)))
+# define ALIGN2 __attribute__((aligned(2)))
+# define ALIGN4 __attribute__((aligned(4)))
+#else
+/* Arches which MUST have 2 or 4 byte alignment for everything are here */
+# define ALIGN1
+# define ALIGN2
+# define ALIGN4
#endif
-/* uclibc does not implement daemon for no-mmu systems.
+/*
* For 0.9.29 and svn, __ARCH_USE_MMU__ indicates no-mmu reliably.
* For earlier versions there is no reliable way to check if we are building
- * for a mmu-less system; the user should pass CFLAGS_EXTRA="-DBB_NOMMU"
- * on his own.
+ * for a mmu-less system.
*/
-#if defined __UCLIBC__ && __UCLIBC_MAJOR__ >= 0 && __UCLIBC_MINOR__ >= 9 && \
- __UCLIBC_SUBLEVEL__ > 28 && !defined __ARCH_USE_MMU__
-#define BB_NOMMU
+#if ENABLE_NOMMU || \
+ (defined __UCLIBC__ && __UCLIBC_MAJOR__ >= 0 && __UCLIBC_MINOR__ >= 9 && \
+ __UCLIBC_SUBLEVEL__ > 28 && !defined __ARCH_USE_MMU__)
+# define BB_MMU 0
+# define USE_FOR_NOMMU(...) __VA_ARGS__
+# define USE_FOR_MMU(...)
+#else
+# define BB_MMU 1
+# define USE_FOR_NOMMU(...)
+# define USE_FOR_MMU(...) __VA_ARGS__
#endif
-/* Platforms that haven't got dprintf need to implement fdprintf() in
- * libbb. This would require a platform.c. It's not going to be cleaned
- * out of the tree, so stop saying it should be. */
-#define fdprintf dprintf
+#if defined(__digital__) && defined(__unix__)
+# include <standards.h>
+# include <inttypes.h>
+# define PRIu32 "u"
+# if !defined ADJ_OFFSET_SINGLESHOT && defined MOD_CLKA && defined MOD_OFFSET
+# define ADJ_OFFSET_SINGLESHOT (MOD_CLKA | MOD_OFFSET)
+# endif
+# if !defined ADJ_FREQUENCY && defined MOD_FREQUENCY
+# define ADJ_FREQUENCY MOD_FREQUENCY
+# endif
+# if !defined ADJ_TIMECONST && defined MOD_TIMECONST
+# define ADJ_TIMECONST MOD_TIMECONST
+# endif
+# if !defined ADJ_TICK && defined MOD_CLKB
+# define ADJ_TICK MOD_CLKB
+# endif
+#endif
+
+
+/* ---- Who misses what? ------------------------------------ */
-/* THIS SHOULD BE CLEANED OUT OF THE TREE ENTIRELY */
-/* FIXME: fix tar.c! */
-#ifndef FNM_LEADING_DIR
-#define FNM_LEADING_DIR 0
+/* Assume all these functions and header files exist by default.
+ * Platforms where it is not true will #undef them below.
+ */
+#define HAVE_CLEARENV 1
+#define HAVE_FDATASYNC 1
+#define HAVE_DPRINTF 1
+#define HAVE_MEMRCHR 1
+#define HAVE_MKDTEMP 1
+#define HAVE_PTSNAME_R 1
+#define HAVE_SETBIT 1
+#define HAVE_SIGHANDLER_T 1
+#define HAVE_STPCPY 1
+#define HAVE_STRCASESTR 1
+#define HAVE_STRCHRNUL 1
+#define HAVE_STRSEP 1
+#define HAVE_STRSIGNAL 1
+#define HAVE_VASPRINTF 1
+#define HAVE_XTABS 1
+#define HAVE_MNTENT_H 1
+#define HAVE_NET_ETHERNET_H 1
+#define HAVE_SYS_STATFS_H 1
+
+#if defined(__GLIBC__) && (__GLIBC__ < 2 || __GLIBC_MINOR__ < 1)
+# undef HAVE_NET_ETHERNET_H
#endif
-#if (defined __digital__ && defined __unix__)
-#include <standards.h>
-#define HAVE_STANDARDS_H
-#include <inttypes.h>
-#define HAVE_INTTYPES_H
-#define PRIu32 "u"
+#if defined(__dietlibc__)
+# undef HAVE_STRCHRNUL
+#endif
-/* use legacy setpgrp(pidt_,pid_t) for now. move to platform.c */
-#define bb_setpgrp do{pid_t __me = getpid();setpgrp(__me,__me);}while(0)
+#if defined(__WATCOMC__)
+# undef HAVE_DPRINTF
+# undef HAVE_MEMRCHR
+# undef HAVE_MKDTEMP
+# undef HAVE_SETBIT
+# undef HAVE_STPCPY
+# undef HAVE_STRCASESTR
+# undef HAVE_STRCHRNUL
+# undef HAVE_STRSEP
+# undef HAVE_STRSIGNAL
+# undef HAVE_VASPRINTF
+# undef HAVE_NET_ETHERNET_H
+#endif
-#if !defined ADJ_OFFSET_SINGLESHOT && defined MOD_CLKA && defined MOD_OFFSET
-#define ADJ_OFFSET_SINGLESHOT (MOD_CLKA | MOD_OFFSET)
+#if defined(__FreeBSD__)
+# undef HAVE_STRCHRNUL
#endif
-#if !defined ADJ_FREQUENCY && defined MOD_FREQUENCY
-#define ADJ_FREQUENCY MOD_FREQUENCY
+
+#if (defined __digital__ && defined __unix__) \
+ || defined __APPLE__ \
+ || defined __FreeBSD__ || defined __OpenBSD__ || defined __NetBSD__
+# undef HAVE_CLEARENV
+# undef HAVE_FDATASYNC
+# undef HAVE_MNTENT_H
+# undef HAVE_PTSNAME_R
+# undef HAVE_SYS_STATFS_H
+# undef HAVE_SIGHANDLER_T
+# undef HAVE_XTABS
+# undef HAVE_DPRINTF
#endif
-#if !defined ADJ_TIMECONST && defined MOD_TIMECONST
-#define ADJ_TIMECONST MOD_TIMECONST
+
+#if defined(__digital__) && defined(__unix__)
+# undef HAVE_STPCPY
#endif
-#if !defined ADJ_TICK && defined MOD_CLKB
-#define ADJ_TICK MOD_CLKB
+
+#if defined(ANDROID)
+# undef HAVE_DPRINTF
+# undef HAVE_STPCPY
+# undef HAVE_STRCHRNUL
+# undef HAVE_NET_ETHERNET_H
#endif
-#else
-#define bb_setpgrp setpgrp()
+/*
+ * Now, define prototypes for all the functions defined in platform.c
+ * These must come after all the HAVE_* macros are defined (or not)
+ */
+
+#ifndef HAVE_DPRINTF
+extern int dprintf(int fd, const char *format, ...);
+#endif
+
+#ifndef HAVE_MEMRCHR
+extern void *memrchr(const void *s, int c, size_t n) FAST_FUNC;
+#endif
+
+#ifndef HAVE_MKDTEMP
+extern char *mkdtemp(char *template) FAST_FUNC;
+#endif
+
+#ifndef HAVE_SETBIT
+# define setbit(a, b) ((a)[(b) >> 3] |= 1 << ((b) & 7))
+# define clrbit(a, b) ((a)[(b) >> 3] &= ~(1 << ((b) & 7)))
#endif
-#if defined(__linux__)
-#include <sys/mount.h>
-#if !defined(BLKGETSIZE64)
-#define BLKGETSIZE64 _IOR(0x12,114,size_t)
+#ifndef HAVE_SIGHANDLER_T
+typedef void (*sighandler_t)(int);
#endif
+
+#ifndef HAVE_STPCPY
+extern char *stpcpy(char *p, const char *to_add) FAST_FUNC;
+#endif
+
+#ifndef HAVE_STRCASESTR
+extern char *strcasestr(const char *s, const char *pattern) FAST_FUNC;
+#endif
+
+#ifndef HAVE_STRCHRNUL
+extern char *strchrnul(const char *s, int c) FAST_FUNC;
+#endif
+
+#ifndef HAVE_STRSEP
+extern char *strsep(char **stringp, const char *delim) FAST_FUNC;
+#endif
+
+#ifndef HAVE_STRSIGNAL
+/* Not exactly the same: instead of "Stopped" it shows "STOP" etc */
+# define strsignal(sig) get_signame(sig)
#endif
-#endif /* platform.h */
+#ifndef HAVE_VASPRINTF
+extern int vasprintf(char **string_ptr, const char *format, va_list p) FAST_FUNC;
+#endif
+
+#endif
projects / oweals / busybox.git / blobdiff