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