dl-syscall.h 6.3 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 _LD_SYSCALL_H_
  8. #define _LD_SYSCALL_H_
  9. /* Pull in the arch specific syscall implementation */
  10. #include <dl-syscalls.h>
  11. /* For MAP_ANONYMOUS -- differs between platforms */
  12. #include <asm/mman.h>
  13. /* Pull in whatever this particular arch's kernel thinks the kernel version of
  14. * struct stat should look like. It turns out that each arch has a different
  15. * opinion on the subject, and different kernel revs use different names... */
  16. #define kernel_stat stat
  17. #include <bits/kernel_stat.h>
  18. #include <bits/kernel_types.h>
  19. /* _dl_open() parameters */
  20. #define O_RDONLY 00
  21. #define O_WRONLY 01
  22. #define O_RDWR 02
  23. #define O_CREAT 0100
  24. /* Encoding of the file mode. */
  25. #define S_IFMT 0170000 /* These bits determine file type. */
  26. /* File types. */
  27. #define S_IFDIR 0040000 /* Directory. */
  28. #define S_IFCHR 0020000 /* Character device. */
  29. #define S_IFBLK 0060000 /* Block device. */
  30. #define S_IFREG 0100000 /* Regular file. */
  31. #define S_IFIFO 0010000 /* FIFO. */
  32. #define S_IFLNK 0120000 /* Symbolic link. */
  33. #define S_IFSOCK 0140000 /* Socket. */
  34. /* Protection bits. */
  35. #define S_ISUID 04000 /* Set user ID on execution. */
  36. #define S_ISGID 02000 /* Set group ID on execution. */
  37. #define S_ISVTX 01000 /* Save swapped text after use (sticky). */
  38. #define S_IREAD 0400 /* Read by owner. */
  39. #define S_IWRITE 0200 /* Write by owner. */
  40. #define S_IEXEC 0100 /* Execute by owner. */
  41. /* Here are the definitions for some syscalls that are used
  42. by the dynamic linker. The idea is that we want to be able
  43. to call these before the errno symbol is dynamicly linked, so
  44. we use our own version here. Note that we cannot assume any
  45. dynamic linking at all, so we cannot return any error codes.
  46. We just punt if there is an error. */
  47. #define __NR__dl_exit __NR_exit
  48. static inline _syscall1(void, _dl_exit, int, status);
  49. #define __NR__dl_close __NR_close
  50. static inline _syscall1(int, _dl_close, int, fd);
  51. #define __NR__dl_open __NR_open
  52. static inline _syscall3(int, _dl_open, const char *, fn, int, flags,
  53. __kernel_mode_t, mode);
  54. #define __NR__dl_write __NR_write
  55. static inline _syscall3(unsigned long, _dl_write, int, fd,
  56. const void *, buf, unsigned long, count);
  57. #define __NR__dl_read __NR_read
  58. static inline _syscall3(unsigned long, _dl_read, int, fd,
  59. const void *, buf, unsigned long, count);
  60. #define __NR__dl_mprotect __NR_mprotect
  61. static inline _syscall3(int, _dl_mprotect, const void *, addr,
  62. unsigned long, len, int, prot);
  63. #define __NR__dl_stat __NR_stat
  64. static inline _syscall2(int, _dl_stat, const char *, file_name,
  65. struct stat *, buf);
  66. #define __NR__dl_fstat __NR_fstat
  67. static inline _syscall2(int, _dl_fstat, int, fd, struct stat *, buf);
  68. #define __NR__dl_munmap __NR_munmap
  69. static inline _syscall2(int, _dl_munmap, void *, start, unsigned long, length);
  70. #ifdef __NR_getxuid
  71. # define __NR_getuid __NR_getxuid
  72. #endif
  73. #define __NR__dl_getuid __NR_getuid
  74. static inline _syscall0(uid_t, _dl_getuid);
  75. #ifndef __NR_geteuid
  76. # define __NR_geteuid __NR_getuid
  77. #endif
  78. #define __NR__dl_geteuid __NR_geteuid
  79. static inline _syscall0(uid_t, _dl_geteuid);
  80. #ifdef __NR_getxgid
  81. # define __NR_getgid __NR_getxgid
  82. #endif
  83. #define __NR__dl_getgid __NR_getgid
  84. static inline _syscall0(gid_t, _dl_getgid);
  85. #ifndef __NR_getegid
  86. # define __NR_getegid __NR_getgid
  87. #endif
  88. #define __NR__dl_getegid __NR_getegid
  89. static inline _syscall0(gid_t, _dl_getegid);
  90. #ifdef __NR_getxpid
  91. # define __NR_getpid __NR_getxpid
  92. #endif
  93. #define __NR__dl_getpid __NR_getpid
  94. static inline _syscall0(gid_t, _dl_getpid);
  95. #define __NR__dl_readlink __NR_readlink
  96. static inline _syscall3(int, _dl_readlink, const char *, path, char *, buf,
  97. size_t, bufsiz);
  98. #ifdef __UCLIBC_HAS_SSP__
  99. # include <sys/time.h>
  100. # define __NR__dl_gettimeofday __NR_gettimeofday
  101. static inline _syscall2(int, _dl_gettimeofday, struct timeval *, tv,
  102. # ifdef __USE_BSD
  103. struct timezone *, tz);
  104. # else
  105. void *, tz);
  106. # endif
  107. #endif
  108. /* handle all the fun mmap intricacies */
  109. #if (defined(__UCLIBC_MMAP_HAS_6_ARGS__) && defined(__NR_mmap)) || !defined(__NR_mmap2)
  110. # define _dl_MAX_ERRNO 4096
  111. # define _dl_mmap_check_error(__res) \
  112. (((long)__res) < 0 && ((long)__res) >= -_dl_MAX_ERRNO)
  113. #else
  114. # define MAP_FAILED ((void *) -1)
  115. # define _dl_mmap_check_error(X) (((void *)X) == MAP_FAILED)
  116. #endif
  117. /* first try mmap(), syscall6() style */
  118. #if defined(__UCLIBC_MMAP_HAS_6_ARGS__) && defined(__NR_mmap)
  119. # define __NR__dl_mmap __NR_mmap
  120. static inline _syscall6(void *, _dl_mmap, void *, start, size_t, length,
  121. int, prot, int, flags, int, fd, off_t, offset);
  122. /* then try mmap2() */
  123. #elif defined(__NR_mmap2)
  124. # define __NR___syscall_mmap2 __NR_mmap2
  125. static inline _syscall6(__ptr_t, __syscall_mmap2, __ptr_t, addr, size_t, len,
  126. int, prot, int, flags, int, fd, off_t, offset);
  127. /* Some architectures always use 12 as page shift for mmap2() eventhough the
  128. * real PAGE_SHIFT != 12. Other architectures use the same value as
  129. * PAGE_SHIFT...
  130. */
  131. #ifndef MMAP2_PAGE_SHIFT
  132. # define MMAP2_PAGE_SHIFT 12
  133. #endif
  134. static inline void * _dl_mmap(void * addr, unsigned long size, int prot,
  135. int flags, int fd, unsigned long offset)
  136. {
  137. if (offset & ((1 << MMAP2_PAGE_SHIFT) - 1))
  138. return MAP_FAILED;
  139. return __syscall_mmap2(addr, size, prot, flags,
  140. fd, (off_t) (offset >> MMAP2_PAGE_SHIFT));
  141. }
  142. /* finally, fall back to mmap(), syscall1() style */
  143. #elif defined(__NR_mmap)
  144. # define __NR__dl_mmap_real __NR_mmap
  145. static inline _syscall1(void *, _dl_mmap_real, unsigned long *, buffer);
  146. static inline void * _dl_mmap(void * addr, unsigned long size, int prot,
  147. int flags, int fd, unsigned long offset)
  148. {
  149. unsigned long buffer[6];
  150. buffer[0] = (unsigned long) addr;
  151. buffer[1] = (unsigned long) size;
  152. buffer[2] = (unsigned long) prot;
  153. buffer[3] = (unsigned long) flags;
  154. buffer[4] = (unsigned long) fd;
  155. buffer[5] = (unsigned long) offset;
  156. return (void *) _dl_mmap_real(buffer);
  157. }
  158. #else
  159. # error "Your architecture doesn't seem to provide mmap() !?"
  160. #endif
  161. #endif /* _LD_SYSCALL_H_ */