dl-syscall.h 7.0 KB

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  1. /* vi: set sw=4 ts=4: */
  2. /*
  3. * Copyright (C) 2000-2005 by Erik Andersen <andersen@codepoet.org>
  4. *
  5. * GNU Lesser General Public License version 2.1 or later.
  6. */
  7. #ifndef _DL_SYSCALL_H
  8. #define _DL_SYSCALL_H
  9. /* We can't use the real errno in ldso, since it has not yet
  10. * been dynamicly linked in yet. */
  11. #include "sys/syscall.h"
  12. extern int _dl_errno;
  13. #undef __set_errno
  14. #define __set_errno(X) {(_dl_errno) = (X);}
  15. /* Pull in the arch specific syscall implementation */
  16. #include <dl-syscalls.h>
  17. /* For MAP_ANONYMOUS -- differs between platforms */
  18. #define _SYS_MMAN_H 1
  19. #include <bits/mman.h>
  20. #ifdef __ARCH_HAS_DEPRECATED_SYSCALLS__
  21. /* Pull in whatever this particular arch's kernel thinks the kernel version of
  22. * struct stat should look like. It turns out that each arch has a different
  23. * opinion on the subject, and different kernel revs use different names... */
  24. #define kernel_stat stat
  25. #include <bits/kernel_stat.h>
  26. #include <bits/kernel_types.h>
  27. /* Protection bits. */
  28. #define S_ISUID 04000 /* Set user ID on execution. */
  29. #define S_ISGID 02000 /* Set group ID on execution. */
  30. #else
  31. /* 1. common-generic ABI doesn't need kernel_stat translation
  32. * 3. S_IS?ID already provided by stat.h
  33. */
  34. #include <sys/stat.h>
  35. #endif
  36. /* Here are the definitions for some syscalls that are used
  37. by the dynamic linker. The idea is that we want to be able
  38. to call these before the errno symbol is dynamicly linked, so
  39. we use our own version here. Note that we cannot assume any
  40. dynamic linking at all, so we cannot return any error codes.
  41. We just punt if there is an error. */
  42. #define __NR__dl_exit __NR_exit
  43. static __always_inline attribute_noreturn __cold void _dl_exit(int status)
  44. {
  45. INLINE_SYSCALL(_dl_exit, 1, status);
  46. #if defined __GNUC__
  47. __builtin_unreachable(); /* shut up warning: 'noreturn' function does return*/
  48. #else
  49. while (1);
  50. #endif
  51. }
  52. #define __NR__dl_close __NR_close
  53. static __always_inline _syscall1(int, _dl_close, int, fd)
  54. #if defined __NR_openat && !defined __NR_open
  55. static __always_inline int _dl_open(const char *fn,
  56. int flags, __kernel_mode_t mode)
  57. {
  58. return INLINE_SYSCALL(openat, 4, AT_FDCWD, fn, flags, mode);
  59. }
  60. #elif defined __NR_open
  61. # define __NR__dl_open __NR_open
  62. static __always_inline _syscall3(int, _dl_open, const char *, fn, int, flags,
  63. __kernel_mode_t, mode)
  64. #endif
  65. #define __NR__dl_write __NR_write
  66. static __always_inline _syscall3(unsigned long, _dl_write, int, fd,
  67. const void *, buf, unsigned long, count)
  68. #define __NR__dl_read __NR_read
  69. static __always_inline _syscall3(unsigned long, _dl_read, int, fd,
  70. const void *, buf, unsigned long, count)
  71. #define __NR__dl_mprotect __NR_mprotect
  72. static __always_inline _syscall3(int, _dl_mprotect, const void *, addr,
  73. unsigned long, len, int, prot)
  74. #if defined __NR_fstatat64 && !defined __NR_stat
  75. # define __NR__dl_fstatat64 __NR_fstatat64
  76. static __always_inline _syscall4(int, _dl_fstatat64, int, fd, const char *,
  77. fn, struct stat *, stat, int, flags)
  78. static __always_inline int _dl_stat(const char *file_name,
  79. struct stat *buf)
  80. {
  81. return _dl_fstatat64(AT_FDCWD, file_name, buf, 0);
  82. }
  83. #elif defined __NR_stat
  84. # define __NR__dl_stat __NR_stat
  85. static __always_inline _syscall2(int, _dl_stat, const char *, file_name,
  86. struct stat *, buf)
  87. #endif
  88. #if defined __NR_fstat64 && !defined __NR_fstat
  89. # define __NR__dl_fstat __NR_fstat64
  90. #elif defined __NR_fstat
  91. # define __NR__dl_fstat __NR_fstat
  92. #endif
  93. static __always_inline _syscall2(int, _dl_fstat, int, fd, struct stat *, buf)
  94. #define __NR__dl_munmap __NR_munmap
  95. static __always_inline _syscall2(int, _dl_munmap, void *, start, unsigned long, length)
  96. #ifdef __NR_getxuid
  97. # define __NR_getuid __NR_getxuid
  98. #endif
  99. #define __NR__dl_getuid __NR_getuid
  100. static __always_inline _syscall0(uid_t, _dl_getuid)
  101. #ifndef __NR_geteuid
  102. # define __NR_geteuid __NR_getuid
  103. #endif
  104. #define __NR__dl_geteuid __NR_geteuid
  105. static __always_inline _syscall0(uid_t, _dl_geteuid)
  106. #ifdef __NR_getxgid
  107. # define __NR_getgid __NR_getxgid
  108. #endif
  109. #define __NR__dl_getgid __NR_getgid
  110. static __always_inline _syscall0(gid_t, _dl_getgid)
  111. #ifndef __NR_getegid
  112. # define __NR_getegid __NR_getgid
  113. #endif
  114. #define __NR__dl_getegid __NR_getegid
  115. static __always_inline _syscall0(gid_t, _dl_getegid)
  116. #ifdef __NR_getxpid
  117. # define __NR_getpid __NR_getxpid
  118. #endif
  119. #define __NR__dl_getpid __NR_getpid
  120. static __always_inline _syscall0(gid_t, _dl_getpid)
  121. #if defined __NR_readlinkat
  122. # define __NR__dl_readlink __NR_readlinkat
  123. static __always_inline _syscall4(int, _dl_readlink, int, id, const char *, path,
  124. char *, buf, size_t, bufsiz)
  125. #endif
  126. #ifdef __NR_pread64
  127. #define __NR___syscall_pread __NR_pread64
  128. static __always_inline _syscall5(ssize_t, __syscall_pread, int, fd, void *, buf,
  129. size_t, count, off_t, offset_hi, off_t, offset_lo)
  130. static __always_inline ssize_t
  131. _dl_pread(int fd, void *buf, size_t count, off_t offset)
  132. {
  133. return __syscall_pread(fd, buf, count, offset, offset >> 31);
  134. }
  135. #elif defined __NR_pread
  136. #define __NR___syscall_pread __NR_pread
  137. static __always_inline _syscall5(ssize_t, __syscall_pread, int, fd, void *, buf,
  138. size_t, count, off_t, offset_hi, off_t, offset_lo)
  139. static __always_inline ssize_t
  140. _dl_pread(int fd, void *buf, size_t count, off_t offset)
  141. {
  142. return __syscall_pread(fd, buf, count, __LONG_LONG_PAIR(offset >> 31, offset));
  143. }
  144. #endif
  145. #ifdef __UCLIBC_HAS_SSP__
  146. # include <sys/time.h>
  147. # define __NR__dl_gettimeofday __NR_gettimeofday
  148. static __always_inline _syscall2(int, _dl_gettimeofday, struct timeval *, tv,
  149. # ifdef __USE_BSD
  150. struct timezone *
  151. # else
  152. void *
  153. # endif
  154. , tz)
  155. #endif
  156. /* Some architectures always use 12 as page shift for mmap2() eventhough the
  157. * real PAGE_SHIFT != 12. Other architectures use the same value as
  158. * PAGE_SHIFT...
  159. */
  160. #ifndef MMAP2_PAGE_SHIFT
  161. # define MMAP2_PAGE_SHIFT 12
  162. #endif
  163. #define MAP_FAILED ((void *) -1)
  164. #define _dl_mmap_check_error(X) (((void *)X) == MAP_FAILED)
  165. static __always_inline
  166. void *_dl_mmap(void *addr, unsigned long size, int prot,
  167. int flags, int fd, unsigned long offset)
  168. {
  169. #if defined(__UCLIBC_MMAP_HAS_6_ARGS__) && defined(__NR_mmap)
  170. /* first try mmap(), syscall6() style */
  171. return (void *)INLINE_SYSCALL(mmap, 6, addr, size, prot, flags, fd, offset);
  172. #elif defined(__NR_mmap2) && !defined (__mcoldfire__)
  173. /* then try mmap2() */
  174. unsigned long shifted;
  175. if (offset & ((1 << MMAP2_PAGE_SHIFT) - 1))
  176. return MAP_FAILED;
  177. /* gcc needs help with putting things onto the stack */
  178. shifted = offset >> MMAP2_PAGE_SHIFT;
  179. return (void *)INLINE_SYSCALL(mmap2, 6, addr, size, prot, flags, fd, shifted);
  180. #elif defined(__NR_mmap)
  181. /* finally, fall back to mmap(), syscall1() style */
  182. unsigned long buffer[6];
  183. buffer[0] = (unsigned long) addr;
  184. buffer[1] = (unsigned long) size;
  185. buffer[2] = (unsigned long) prot;
  186. buffer[3] = (unsigned long) flags;
  187. buffer[4] = (unsigned long) fd;
  188. buffer[5] = (unsigned long) offset;
  189. return (void *)INLINE_SYSCALL(mmap, 1, buffer);
  190. #else
  191. # error "Your architecture doesn't seem to provide mmap() !?"
  192. #endif
  193. }
  194. #endif /* _DL_SYSCALL_H */