1/*
 2 * Copyright (C) 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
 3 * Licensed under the GPL
 4 */
 5
 6#include <signal.h>
 7#include <sched.h>
 8#include <asm/unistd.h>
 9#include <sys/time.h>
10#include "as-layout.h"
11#include "kern_constants.h"
12#include "ptrace_user.h"
13#include "stub-data.h"
14#include "sysdep/stub.h"
15
16/*
17 * This is in a separate file because it needs to be compiled with any
18 * extraneous gcc flags (-pg, -fprofile-arcs, -ftest-coverage) disabled
19 *
20 * Use UM_KERN_PAGE_SIZE instead of PAGE_SIZE because that calls getpagesize
21 * on some systems.
22 */
23
24void __attribute__ ((__section__ (".__syscall_stub")))
25stub_clone_handler(void)
26{
27	struct stub_data *data = (struct stub_data *) STUB_DATA;
28	long err;
29
30	err = stub_syscall2(__NR_clone, CLONE_PARENT | CLONE_FILES | SIGCHLD,
31			    STUB_DATA + UM_KERN_PAGE_SIZE / 2 - sizeof(void *));
32	if (err != 0)
33		goto out;
34
35	err = stub_syscall4(__NR_ptrace, PTRACE_TRACEME, 0, 0, 0);
36	if (err)
37		goto out;
38
39	err = stub_syscall3(__NR_setitimer, ITIMER_VIRTUAL,
40			    (long) &data->timer, 0);
41	if (err)
42		goto out;
43
44	remap_stack(data->fd, data->offset);
45	goto done;
46
47 out:
48	/*
49	 * save current result.
50	 * Parent: pid;
51	 * child: retcode of mmap already saved and it jumps around this
52	 * assignment
53	 */
54	data->err = err;
55 done:
56	trap_myself();
57}