ftrace.c revision 1.1 
1/* This testcase is part of GDB, the GNU debugger.
2
3   Copyright 2011-2014 Free Software Foundation, Inc.
4
5   This program is free software; you can redistribute it and/or modify
6   it under the terms of the GNU General Public License as published by
7   the Free Software Foundation; either version 3 of the License, or
8   (at your option) any later version.
9
10   This program is distributed in the hope that it will be useful,
11   but WITHOUT ANY WARRANTY; without even the implied warranty of
12   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13   GNU General Public License for more details.
14
15   You should have received a copy of the GNU General Public License
16   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
17
18#ifdef SYMBOL_PREFIX
19#define SYMBOL(str)     SYMBOL_PREFIX #str
20#else
21#define SYMBOL(str)     #str
22#endif
23
24int globvar;
25
26static void
27begin (void)
28{}
29
30/* Called from asm.  */
31static void __attribute__((used))
32func (void)
33{}
34
35static void
36marker (int anarg)
37{
38  /* `set_point' is the label at which to set a fast tracepoint.  The
39     insn at the label must be large enough to fit a fast tracepoint
40     jump.  */
41  asm ("    .global " SYMBOL(set_point) "\n"
42       SYMBOL(set_point) ":\n"
43#if (defined __x86_64__ || defined __i386__)
44       "    call " SYMBOL(func) "\n"
45#endif
46       );
47
48  ++anarg;
49
50  /* Set up a known 4-byte instruction so we can try to set a shorter
51     fast tracepoint at it.  */
52  asm ("    .global " SYMBOL(four_byter) "\n"
53       SYMBOL(four_byter) ":\n"
54#if (defined __i386__)
55       "    cmpl $0x1,0x8(%ebp) \n"
56#endif
57       );
58}
59
60static void
61end (void)
62{}
63
64int
65main ()
66{
67  begin ();
68
69  for (globvar = 1; globvar < 11; ++globvar)
70    {
71      marker (globvar * 100);
72    }
73
74  end ();
75  return 0;
76}
77