gdb/testsuite/gdb.trace/ftrace.c

   1 /* This testcase is part of GDB, the GNU debugger.
   2
   3    Copyright 2011-2013 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
  24 int globvar;
  25
  26 static void
  27 begin (void)
  28 {}
  29
  30 /* Called from asm.  */
  31 static void __attribute__((used))
  32 func (void)
  33 {}
  34
  35 static void
  36 marker (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
  60 static void
  61 end (void)
  62 {}
  63
  64 int
  65 main ()
  66 {
  67   begin ();
  68
  69   for (globvar = 1; globvar < 11; ++globvar)
  70     {
  71       marker (globvar * 100);
  72     }
  73
  74   end ();
  75   return 0;
  76 }