dl-syscall.h 5.0 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150
  1. #ifndef _LD_SYSCALL_H_
  2. #define _LD_SYSCALL_H_
  3. /* Pull in the arch specific syscall implementation */
  4. #include <dl-syscalls.h>
  5. /* For MAP_ANONYMOUS -- differs between platforms */
  6. #include <asm/mman.h>
  7. /* Pull in whatever this particular arch's kernel thinks the kernel version of
  8. * struct stat should look like. It turns out that each arch has a different
  9. * opinion on the subject, and different kernel revs use different names... */
  10. #define kernel_stat stat
  11. #include <bits/kernel_stat.h>
  12. #include <bits/kernel_types.h>
  13. /* _dl_open() parameters */
  14. #define O_RDONLY 0x0000
  15. #define O_WRONLY 01
  16. #define O_RDWR 02
  17. #define O_CREAT 0100
  18. /* Encoding of the file mode. */
  19. #define S_IFMT 0170000 /* These bits determine file type. */
  20. /* File types. */
  21. #define S_IFDIR 0040000 /* Directory. */
  22. #define S_IFCHR 0020000 /* Character device. */
  23. #define S_IFBLK 0060000 /* Block device. */
  24. #define S_IFREG 0100000 /* Regular file. */
  25. #define S_IFIFO 0010000 /* FIFO. */
  26. #define S_IFLNK 0120000 /* Symbolic link. */
  27. #define S_IFSOCK 0140000 /* Socket. */
  28. /* Protection bits. */
  29. #define S_ISUID 04000 /* Set user ID on execution. */
  30. #define S_ISGID 02000 /* Set group ID on execution. */
  31. #define S_ISVTX 01000 /* Save swapped text after use (sticky). */
  32. #define S_IREAD 0400 /* Read by owner. */
  33. #define S_IWRITE 0200 /* Write by owner. */
  34. #define S_IEXEC 0100 /* Execute by owner. */
  35. /* Stuff for _dl_mmap */
  36. #if 0
  37. #define MAP_FAILED ((void *) -1)
  38. #define _dl_mmap_check_error(X) (((void *)X) == MAP_FAILED)
  39. #else
  40. #ifndef _dl_MAX_ERRNO
  41. #define _dl_MAX_ERRNO 4096
  42. #endif
  43. #define _dl_mmap_check_error(__res) \
  44. (((long)__res) < 0 && ((long)__res) >= -_dl_MAX_ERRNO)
  45. #endif
  46. /* Here are the definitions for some syscalls that are used
  47. by the dynamic linker. The idea is that we want to be able
  48. to call these before the errno symbol is dynamicly linked, so
  49. we use our own version here. Note that we cannot assume any
  50. dynamic linking at all, so we cannot return any error codes.
  51. We just punt if there is an error. */
  52. #define __NR__dl_exit __NR_exit
  53. static inline _syscall1(void, _dl_exit, int, status);
  54. #define __NR__dl_close __NR_close
  55. static inline _syscall1(int, _dl_close, int, fd);
  56. #define __NR__dl_open __NR_open
  57. static inline _syscall3(int, _dl_open, const char *, fn, int, flags, __kernel_mode_t, mode);
  58. #define __NR__dl_write __NR_write
  59. static inline _syscall3(unsigned long, _dl_write, int, fd,
  60. const void *, buf, unsigned long, count);
  61. #define __NR__dl_read __NR_read
  62. static inline _syscall3(unsigned long, _dl_read, int, fd,
  63. const void *, buf, unsigned long, count);
  64. #define __NR__dl_mprotect __NR_mprotect
  65. static inline _syscall3(int, _dl_mprotect, const void *, addr, unsigned long, len, int, prot);
  66. #define __NR__dl_stat __NR_stat
  67. static inline _syscall2(int, _dl_stat, const char *, file_name, struct stat *, buf);
  68. #define __NR__dl_fstat __NR_fstat
  69. static inline _syscall2(int, _dl_fstat, int, fd, struct stat *, buf);
  70. #define __NR__dl_munmap __NR_munmap
  71. static inline _syscall2(int, _dl_munmap, void *, start, unsigned long, length);
  72. #define __NR__dl_getuid __NR_getuid
  73. static inline _syscall0(uid_t, _dl_getuid);
  74. #define __NR__dl_geteuid __NR_geteuid
  75. static inline _syscall0(uid_t, _dl_geteuid);
  76. #define __NR__dl_getgid __NR_getgid
  77. static inline _syscall0(gid_t, _dl_getgid);
  78. #define __NR__dl_getegid __NR_getegid
  79. static inline _syscall0(gid_t, _dl_getegid);
  80. #define __NR__dl_getpid __NR_getpid
  81. static inline _syscall0(gid_t, _dl_getpid);
  82. #define __NR__dl_readlink __NR_readlink
  83. static inline _syscall3(int, _dl_readlink, const char *, path, char *, buf, size_t, bufsiz);
  84. #ifdef __NR_mmap
  85. #ifdef MMAP_HAS_6_ARGS
  86. #define __NR__dl_mmap __NR_mmap
  87. static inline _syscall6(void *, _dl_mmap, void *, start, size_t, length,
  88. int, prot, int, flags, int, fd, off_t, offset);
  89. #else
  90. #define __NR__dl_mmap_real __NR_mmap
  91. static inline _syscall1(void *, _dl_mmap_real, unsigned long *, buffer);
  92. static inline void * _dl_mmap(void * addr, unsigned long size, int prot,
  93. int flags, int fd, unsigned long offset)
  94. {
  95. unsigned long buffer[6];
  96. buffer[0] = (unsigned long) addr;
  97. buffer[1] = (unsigned long) size;
  98. buffer[2] = (unsigned long) prot;
  99. buffer[3] = (unsigned long) flags;
  100. buffer[4] = (unsigned long) fd;
  101. buffer[5] = (unsigned long) offset;
  102. return (void *) _dl_mmap_real(buffer);
  103. }
  104. #endif
  105. #elif defined __NR_mmap2
  106. #define __NR___syscall_mmap2 __NR_mmap2
  107. static inline _syscall6(__ptr_t, __syscall_mmap2, __ptr_t, addr,
  108. size_t, len, int, prot, int, flags, int, fd, off_t, offset);
  109. /*always 12, even on architectures where PAGE_SHIFT != 12 */
  110. #define MMAP2_PAGE_SHIFT 12
  111. static inline void * _dl_mmap(void * addr, unsigned long size, int prot,
  112. int flags, int fd, unsigned long offset)
  113. {
  114. if (offset & ((1 << MMAP2_PAGE_SHIFT) - 1))
  115. return MAP_FAILED;
  116. return(__syscall_mmap2(addr, size, prot, flags,
  117. fd, (off_t) (offset >> MMAP2_PAGE_SHIFT)));
  118. }
  119. #else
  120. #error "Your architecture doesn't seem to provide mmap() !?"
  121. #endif
  122. #endif /* _LD_SYSCALL_H_ */