text: /*
   * Copyright (C) 2015 Thomas Meyer (thomas@m3y3r.de)
   * Copyright (C) 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
   * Licensed under the GPL
   */
  
  #include <signal.h>
  #include <sched.h>
  #include <asm/unistd.h>
  #include <sys/time.h>
  #include <as-layout.h>
  #include <ptrace_user.h>
  #include <stub-data.h>
  #include <sysdep/stub.h>
  
  /*
   * This is in a separate file because it needs to be compiled with any
   * extraneous gcc flags (-pg, -fprofile-arcs, -ftest-coverage) disabled
   *
   * Use UM_KERN_PAGE_SIZE instead of PAGE_SIZE because that calls getpagesize
   * on some systems.
   */
  
  void __attribute__ ((__section__ (".__syscall_stub")))
  stub_clone_handler(void)
  {
  	struct stub_data *data = (struct stub_data *) STUB_DATA;
  	long err;
  
  	err = stub_syscall2(__NR_clone, CLONE_PARENT | CLONE_FILES | SIGCHLD,
  			    STUB_DATA + UM_KERN_PAGE_SIZE / 2 - sizeof(void *));
  	if (err != 0)
  		goto out;
  
  	err = stub_syscall4(__NR_ptrace, PTRACE_TRACEME, 0, 0, 0);
  	if (err)
  		goto out;
  
  	remap_stack(data->fd, data->offset);
  	goto done;
  
   out:
  	/*
  	 * save current result.
  	 * Parent: pid;
  	 * child: retcode of mmap already saved and it jumps around this
  	 * assignment
  	 */
  	data->err = err;
   done:
  	trap_myself();
  }
  