Provide mprotect syscall

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 954 matching lines @@
 
 __extern_always_inline ssize_t
 INTERNAL_SYSCALL_modify_ldt_3 (int *err, int func, void *ptr,
                                unsigned long bytecount)
 {
   *err = (38 /* ENOSYS */);
   return 0;
 }
 
 __extern_always_inline int
-INTERNAL_SYSCALL_mprotect_3 (int *err, const void *addr, size_t len, int prot)
+INTERNAL_SYSCALL_mprotect_3 (int *err, void *addr, size_t len, int prot)
 {
-  *err = (38 /* ENOSYS */);
+  *err = __nacl_irt_mprotect (addr, len, prot);
   return 0;
 }
 
 #if !defined (_LIBC) || defined(IS_IN_librt)
 __extern_always_inline mqd_t
 INTERNAL_SYSCALL_mq_getsetattr_3 (int *err, mqd_t mqdes,
                                   struct mq_attr *newattr,
                                   struct mq_attr *oldattr)
 {
   *err = (38 /* ENOSYS */);
@@ skipping 1259 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