added several syscalls for nacl mounts

sysdeps/nacl/sysdep.h

 #ifndef _NACL_SYSDEP_H
 #define _NACL_SYSDEP_H 1
 
 #if !defined(__ASSEMBLER__)
 #include <futex_emulation.h>
 #include <irt_syscalls.h>
 #include <lowlevellock.h>
 
 /* Implementation of all syscalls for use in platform- and OS- independent code
    as inline functions.  Each function translates the syscall arguments into IRT
@@ skipping 96 matching lines @@
 INTERNAL_SYSCALL_capset_2 (int *err, struct __user_cap_header_struct *hdrp,
                            const struct __user_cap_data_struct *datap)
 {
   *err = (38 /* ENOSYS */);
   return 0;
 }
 
 __extern_always_inline int
 INTERNAL_SYSCALL_chdir_1 (int *err, const char *path)
 {
-  *err = (38 /* ENOSYS */);
+  *err = __nacl_irt_chdir (path);
   return 0;
 }
 
 __extern_always_inline int
 INTERNAL_SYSCALL_chmod_2 (int *err, const char *path, mode_t mode)
 {
   *err = (38 /* ENOSYS */);
   return 0;
 }
 
@@ skipping 453 matching lines @@
   return 0;
 }
 
 /* NOTE! The user-level library version returns a character pointer.
 
    The system call just returns the length of the buffer filled (which includes
    the ending '\0' character), or zero in case of error.  */
 __extern_always_inline int
 INTERNAL_SYSCALL_getcwd_2 (int *err, char *buf, size_t size)
 {
-  *err = (38 /* ENOSYS */);
-  return 0;
+  int ret;
+  *err = __nacl_irt_getcwd (buf, size, &ret);
+  return ret;
 }
 
 __extern_always_inline gid_t
 INTERNAL_SYSCALL_getegid_0 (int *err)
 {
   *err = (38 /* ENOSYS */);
   return 0;
 }
 
 __extern_always_inline uid_t
@@ skipping 305 matching lines @@
 INTERNAL_SYSCALL_mincore_3 (int *err, void *addr, size_t length,
                             unsigned char *vec)
 {
   *err = (38 /* ENOSYS */);
   return 0;
 }
 
 __extern_always_inline int
 INTERNAL_SYSCALL_mkdir_2 (int *err, const char *pathname, mode_t mode)
 {
-  *err = (38 /* ENOSYS */);
+  *err = __nacl_irt_mkdir (pathname, mode);
   return 0;
 }
 
 __extern_always_inline int
 INTERNAL_SYSCALL_mkdirat_3 (int *err, int dirfd, const char *pathname,
                             mode_t mode)
 {
   *err = (38 /* ENOSYS */);
   return 0;
 }
@@ skipping 369 matching lines @@
 INTERNAL_SYSCALL_renameat_4 (int *err, int olddfd, const char *oldname,
                              int newdfd, const char *newname)
 {
   *err = (38 /* ENOSYS */);
   return 0;
 }
 
 __extern_always_inline int
 INTERNAL_SYSCALL_rmdir_1 (int *err, const char *pathname)
 {
-  *err = (38 /* ENOSYS */);
+  *err = __nacl_irt_rmdir (pathname);
   return 0;
 }
 
 __extern_always_inline int
 INTERNAL_SYSCALL_rt_sigpending_2 (int *err, sigset_t *set, size_t sigsetsize)
 {
   *err = (38 /* ENOSYS */);
   return 0;
 }
 
@@ skipping 786 matching lines @@
 #define PSEUDO_END_ERRVAL(name)                 \
   END (name)
 
 #undef SYSCALL_ERROR_HANDLER_TLS_STORE
 #define SYSCALL_ERROR_HANDLER_TLS_STORE(src, destoff)   \
   movl %gs:0, %eax;                                     \
   movl src, (%eax,destoff)
 
 #endif
 #endif