tm-sysv4.h

这个是LINUX下的GDB调度工具的源码

/* Macro definitions for GDB on all SVR4 target systems.
   Copyright 1991, 1992, 1993, 1994, 1996, 1997, 2000
   Free Software Foundation, Inc.
   Written by Fred Fish at Cygnus Support ([e-mail]).

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

/* For SVR4 shared libraries, each call to a library routine goes through
   a small piece of trampoline code in the ".plt" section.
   The horribly ugly wait_for_inferior() routine uses this macro to detect
   when we have stepped into one of these fragments.
   We do not use lookup_solib_trampoline_symbol_by_pc, because
   we cannot always find the shared library trampoline symbols
   (e.g. on Irix5).  */

#define IN_SOLIB_CALL_TRAMPOLINE(pc, name) in_plt_section((pc), (name))
extern int in_plt_section (CORE_ADDR, char *);

/* If PC is in a shared library trampoline code, return the PC
   where the function itself actually starts.  If not, return 0.  */

#define SKIP_TRAMPOLINE_CODE(pc)  find_solib_trampoline_target (pc)