dl-syscall.h 10 KB

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  1. /*
  2. * Copyright (C) 2000-2005 by Erik Andersen <andersen@codepoet.org>
  3. *
  4. * GNU Lesser General Public License version 2.1 or later.
  5. */
  6. #ifndef _DL_SYSCALL_H
  7. #define _DL_SYSCALL_H
  8. /* We can't use the real errno in ldso, since it has not yet
  9. * been dynamicly linked in yet. */
  10. #include "sys/syscall.h"
  11. extern int _dl_errno;
  12. #undef __set_errno
  13. #define __set_errno(X) {(_dl_errno) = (X);}
  14. /* Pull in the arch specific syscall implementation */
  15. #include <dl-syscalls.h>
  16. /* For MAP_ANONYMOUS -- differs between platforms */
  17. #define _SYS_MMAN_H 1
  18. #include <bits/mman.h>
  19. #ifdef __ARCH_HAS_DEPRECATED_SYSCALLS__
  20. /* Pull in whatever this particular arch's kernel thinks the kernel version of
  21. * struct stat should look like. It turns out that each arch has a different
  22. * opinion on the subject, and different kernel revs use different names... */
  23. #define kernel_stat stat
  24. #include <bits/kernel_stat.h>
  25. #include <bits/kernel_types.h>
  26. /* Protection bits. */
  27. #define S_ISUID 04000 /* Set user ID on execution. */
  28. #define S_ISGID 02000 /* Set group ID on execution. */
  29. #else
  30. /* 1. common-generic ABI doesn't need kernel_stat translation
  31. * 3. S_IS?ID already provided by stat.h
  32. */
  33. #include <fcntl.h>
  34. #include <sys/stat.h>
  35. #include <dl-string.h>
  36. #include <bits/uClibc_arch_features.h>
  37. #if defined __UCLIBC_HAVE_STATX__
  38. static __always_inline void
  39. __cp_stat_statx (struct stat *to, struct statx *from)
  40. {
  41. _dl_memset (to, 0, sizeof (struct stat));
  42. to->st_dev = ((from->stx_dev_minor & 0xff) | (from->stx_dev_major << 8)
  43. | ((from->stx_dev_minor & ~0xff) << 12));
  44. to->st_rdev = ((from->stx_rdev_minor & 0xff) | (from->stx_rdev_major << 8)
  45. | ((from->stx_rdev_minor & ~0xff) << 12));
  46. to->st_ino = from->stx_ino;
  47. to->st_mode = from->stx_mode;
  48. to->st_nlink = from->stx_nlink;
  49. to->st_uid = from->stx_uid;
  50. to->st_gid = from->stx_gid;
  51. to->st_atime = from->stx_atime.tv_sec;
  52. to->st_atim.tv_nsec = from->stx_atime.tv_nsec;
  53. to->st_mtime = from->stx_mtime.tv_sec;
  54. to->st_mtim.tv_nsec = from->stx_mtime.tv_nsec;
  55. to->st_ctime = from->stx_ctime.tv_sec;
  56. to->st_ctim.tv_nsec = from->stx_ctime.tv_nsec;
  57. to->st_size = from->stx_size;
  58. to->st_blocks = from->stx_blocks;
  59. to->st_blksize = from->stx_blksize;
  60. }
  61. #endif
  62. #endif
  63. #define AT_NO_AUTOMOUNT 0x800
  64. #define AT_EMPTY_PATH 0x1000
  65. /* Here are the definitions for some syscalls that are used
  66. by the dynamic linker. The idea is that we want to be able
  67. to call these before the errno symbol is dynamicly linked, so
  68. we use our own version here. Note that we cannot assume any
  69. dynamic linking at all, so we cannot return any error codes.
  70. We just punt if there is an error. */
  71. #define __NR__dl_exit __NR_exit
  72. static __always_inline attribute_noreturn __cold void _dl_exit(int status)
  73. {
  74. INLINE_SYSCALL(_dl_exit, 1, status);
  75. #if __GNUC_PREREQ(4, 5)
  76. __builtin_unreachable(); /* shut up warning: 'noreturn' function does return*/
  77. #else
  78. while (1);
  79. #endif
  80. }
  81. #define __NR__dl_close __NR_close
  82. static __always_inline _syscall1(int, _dl_close, int, fd)
  83. #if defined __NR_openat && !defined __NR_open
  84. static __always_inline int _dl_open(const char *fn,
  85. int flags, __kernel_mode_t mode)
  86. {
  87. return INLINE_SYSCALL(openat, 4, AT_FDCWD, fn, flags, mode);
  88. }
  89. #elif defined __NR_open
  90. # define __NR__dl_open __NR_open
  91. static __always_inline _syscall3(int, _dl_open, const char *, fn, int, flags,
  92. __kernel_mode_t, mode)
  93. #endif
  94. #define __NR__dl_write __NR_write
  95. static __always_inline _syscall3(unsigned long, _dl_write, int, fd,
  96. const void *, buf, unsigned long, count)
  97. #define __NR__dl_read __NR_read
  98. static __always_inline _syscall3(unsigned long, _dl_read, int, fd,
  99. const void *, buf, unsigned long, count)
  100. #define __NR__dl_mprotect __NR_mprotect
  101. static __always_inline _syscall3(int, _dl_mprotect, const void *, addr,
  102. unsigned long, len, int, prot)
  103. #if defined __NR_fstatat64 && !defined __NR_stat
  104. # define __NR__dl_fstatat64 __NR_fstatat64
  105. static __always_inline _syscall4(int, _dl_fstatat64, int, fd, const char *,
  106. fn, struct stat *, stat, int, flags)
  107. static __always_inline int _dl_stat(const char *file_name,
  108. struct stat *buf)
  109. {
  110. return _dl_fstatat64(AT_FDCWD, file_name, buf, 0);
  111. }
  112. #elif defined __NR_newfstatat && !defined __NR_stat
  113. # define __NR__dl_newfstatat __NR_newfstatat
  114. static __always_inline _syscall4(int, _dl_newfstatat, int, fd, const char *,
  115. fn, struct stat *, stat, int, flags)
  116. static __always_inline int _dl_stat(const char *file_name,
  117. struct stat *buf)
  118. {
  119. return _dl_newfstatat(AT_FDCWD, file_name, buf, 0);
  120. }
  121. #elif defined __NR_stat
  122. # define __NR__dl_stat __NR_stat
  123. static __always_inline _syscall2(int, _dl_stat, const char *, file_name,
  124. struct stat *, buf)
  125. #elif defined __NR_statx && defined __UCLIBC_HAVE_STATX__
  126. # define __NR__dl_statx __NR_statx
  127. # include <fcntl.h>
  128. # include <statx_cp.h>
  129. static __always_inline _syscall5(int, _dl_statx, int, fd, const char *, file_name, int, flags,
  130. unsigned int, mask, struct statx *, buf);
  131. static __always_inline int _dl_stat(const char *file_name,
  132. struct stat *buf)
  133. {
  134. struct statx tmp;
  135. int rc = _dl_statx(AT_FDCWD, file_name, AT_NO_AUTOMOUNT, STATX_BASIC_STATS, &tmp);
  136. if (rc == 0)
  137. __cp_stat_statx ((struct stat *)buf, &tmp);
  138. return rc;
  139. }
  140. #endif
  141. #if defined __NR_fstat64 && !defined __NR_fstat
  142. # define __NR__dl_fstat __NR_fstat64
  143. static __always_inline _syscall2(int, _dl_fstat, int, fd, struct stat *, buf)
  144. #elif defined __NR_fstat
  145. # define __NR__dl_fstat __NR_fstat
  146. static __always_inline _syscall2(int, _dl_fstat, int, fd, struct stat *, buf)
  147. #elif defined __NR_statx && defined __UCLIBC_HAVE_STATX__
  148. # define __NR__dl_fstatx __NR_statx
  149. static __always_inline _syscall5(int, _dl_fstatx, int, fd, const char *, file_name, int, flags, unsigned int, mask, struct stat *, buf);
  150. static __always_inline int _dl_fstat(int fd,
  151. struct stat *buf)
  152. {
  153. struct statx tmp;
  154. int rc = _dl_fstatx(fd, "", AT_EMPTY_PATH, STATX_BASIC_STATS, &tmp);
  155. if (rc == 0)
  156. __cp_stat_statx ((struct stat *)buf, &tmp);
  157. return rc;
  158. }
  159. #else
  160. static __always_inline _syscall2(int, _dl_fstat, int, fd, struct stat *, buf)
  161. #endif
  162. #define __NR__dl_munmap __NR_munmap
  163. static __always_inline _syscall2(int, _dl_munmap, void *, start, unsigned long, length)
  164. #ifdef __NR_getxuid
  165. # define __NR_getuid __NR_getxuid
  166. #endif
  167. #define __NR__dl_getuid __NR_getuid
  168. static __always_inline _syscall0(uid_t, _dl_getuid)
  169. #ifndef __NR_geteuid
  170. # define __NR_geteuid __NR_getuid
  171. #endif
  172. #define __NR__dl_geteuid __NR_geteuid
  173. static __always_inline _syscall0(uid_t, _dl_geteuid)
  174. #ifdef __NR_getxgid
  175. # define __NR_getgid __NR_getxgid
  176. #endif
  177. #define __NR__dl_getgid __NR_getgid
  178. static __always_inline _syscall0(gid_t, _dl_getgid)
  179. #ifndef __NR_getegid
  180. # define __NR_getegid __NR_getgid
  181. #endif
  182. #define __NR__dl_getegid __NR_getegid
  183. static __always_inline _syscall0(gid_t, _dl_getegid)
  184. #ifdef __NR_getxpid
  185. # define __NR_getpid __NR_getxpid
  186. #endif
  187. #define __NR__dl_getpid __NR_getpid
  188. static __always_inline _syscall0(gid_t, _dl_getpid)
  189. #if defined __NR_readlinkat
  190. # define __NR__dl_readlink __NR_readlinkat
  191. static __always_inline _syscall4(int, _dl_readlink, int, id, const char *, path,
  192. char *, buf, size_t, bufsiz)
  193. #endif
  194. #ifdef __NR_pread64
  195. #define __NR___syscall_pread __NR_pread64
  196. #ifdef __UCLIBC_SYSCALL_ALIGN_64BIT__
  197. static __always_inline _syscall6(ssize_t, __syscall_pread, int, fd, void *, buf, size_t, dummy,
  198. size_t, count, off_t, offset_hi, off_t, offset_lo)
  199. static __always_inline ssize_t
  200. _dl_pread(int fd, void *buf, size_t count, off_t offset)
  201. {
  202. return __syscall_pread(fd, buf, count, 0, __LONG_LONG_PAIR((offset >> 32), (offset & 0xffffffff)));
  203. }
  204. #else
  205. static __always_inline _syscall5(ssize_t, __syscall_pread, int, fd, void *, buf,
  206. size_t, count, off_t, offset_hi, off_t, offset_lo)
  207. static __always_inline ssize_t
  208. _dl_pread(int fd, void *buf, size_t count, off_t offset)
  209. {
  210. return __syscall_pread(fd, buf, count, __LONG_LONG_PAIR(offset >> 31, offset));
  211. }
  212. #endif
  213. #elif defined __NR_pread
  214. #define __NR___syscall_pread __NR_pread
  215. static __always_inline _syscall5(ssize_t, __syscall_pread, int, fd, void *, buf,
  216. size_t, count, off_t, offset_hi, off_t, offset_lo)
  217. static __always_inline ssize_t
  218. _dl_pread(int fd, void *buf, size_t count, off_t offset)
  219. {
  220. return __syscall_pread(fd, buf, count, __LONG_LONG_PAIR(offset >> 31, offset));
  221. }
  222. #endif
  223. #ifdef __UCLIBC_HAS_SSP__
  224. # include <sys/time.h>
  225. # define __NR__dl_gettimeofday __NR_gettimeofday
  226. static __always_inline _syscall2(int, _dl_gettimeofday, struct timeval *, tv,
  227. # ifdef __USE_BSD
  228. struct timezone *
  229. # else
  230. void *
  231. # endif
  232. , tz)
  233. #endif
  234. /* Some architectures always use 12 as page shift for mmap2() eventhough the
  235. * real PAGE_SHIFT != 12. Other architectures use the same value as
  236. * PAGE_SHIFT...
  237. */
  238. #ifndef MMAP2_PAGE_SHIFT
  239. # define MMAP2_PAGE_SHIFT 12
  240. #endif
  241. #define MAP_FAILED ((void *) -1)
  242. #define _dl_mmap_check_error(X) (((void *)X) == MAP_FAILED)
  243. static __always_inline
  244. void *_dl_mmap(void *addr, unsigned long size, int prot,
  245. int flags, int fd, unsigned long offset)
  246. {
  247. #if defined(__UCLIBC_MMAP_HAS_6_ARGS__) && defined(__NR_mmap)
  248. /* first try mmap(), syscall6() style */
  249. return (void *)INLINE_SYSCALL(mmap, 6, addr, size, prot, flags, fd, offset);
  250. #elif defined(__NR_mmap2) && !defined (__mcoldfire__)
  251. /* then try mmap2() */
  252. unsigned long shifted;
  253. if (offset & ((1 << MMAP2_PAGE_SHIFT) - 1))
  254. return MAP_FAILED;
  255. /* gcc needs help with putting things onto the stack */
  256. shifted = offset >> MMAP2_PAGE_SHIFT;
  257. return (void *)INLINE_SYSCALL(mmap2, 6, addr, size, prot, flags, fd, shifted);
  258. #elif defined(__NR_mmap)
  259. /* finally, fall back to mmap(), syscall1() style */
  260. unsigned long buffer[6];
  261. buffer[0] = (unsigned long) addr;
  262. buffer[1] = (unsigned long) size;
  263. buffer[2] = (unsigned long) prot;
  264. buffer[3] = (unsigned long) flags;
  265. buffer[4] = (unsigned long) fd;
  266. buffer[5] = (unsigned long) offset;
  267. return (void *)INLINE_SYSCALL(mmap, 1, buffer);
  268. #else
  269. # error "Your architecture doesn't seem to provide mmap() !?"
  270. #endif
  271. }
  272. #endif /* _DL_SYSCALL_H */