include/pub_tool_basics_asm.h

   1
   2 /*--------------------------------------------------------------------*/
   3 /*--- Header imported directly by every tool asm file.             ---*/
   4 /*---                                        pub_tool_basics_asm.h ---*/
   5 /*--------------------------------------------------------------------*/
   6
   7 /*
   8    This file is part of Valgrind, a dynamic binary instrumentation
   9    framework.
  10
  11    Copyright (C) 2000-2017 Julian Seward
  12       jseward@acm.org
  13
  14    This program is free software; you can redistribute it and/or
  15    modify it under the terms of the GNU General Public License as
  16    published by the Free Software Foundation; either version 2 of the
  17    License, or (at your option) any later version.
  18
  19    This program is distributed in the hope that it will be useful, but
  20    WITHOUT ANY WARRANTY; without even the implied warranty of
  21    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  22    General Public License for more details.
  23
  24    You should have received a copy of the GNU General Public License
  25    along with this program; if not, see <http://www.gnu.org/licenses/>.
  26
  27    The GNU General Public License is contained in the file COPYING.
  28 */
  29
  30 #ifndef __PUB_TOOL_BASICS_ASM_H
  31 #define __PUB_TOOL_BASICS_ASM_H
  32
  33 // See pub_tool_basics.h for the purpose of these macros.
  34 //
  35 // Note that although the macros here (which are used in asm files) have the
  36 // same name as those in pub_tool_basics.h (which are used in C files), they
  37 // have different definitions.  Actually, on Linux the definitions are the
  38 // same, but on Darwin they are different.  The reason is that C names on
  39 // Darwin always get a '_' prepended to them by the compiler.  But in order to
  40 // refer to them from asm code, we have to add the '_' ourselves.  Having two
  41 // versions of these macros makes that difference transparent, so we can use
  42 // VG_/ML_ in both asm and C files.
  43 //
  44 // Note also that the exact prefixes used have to match those used in
  45 // pub_tool_basics.h.
  46
  47 #define VGAPPEND(str1,str2) str1##str2
  48
  49 #if defined(VGO_linux) || defined(VGO_solaris)
  50 #  define VG_(str)    VGAPPEND( vgPlain_,          str)
  51 #  define ML_(str)    VGAPPEND( vgModuleLocal_,    str)
  52 #elif defined(VGO_darwin)
  53 #  define VG_(str)    VGAPPEND(_vgPlain_,          str)
  54 #  define ML_(str)    VGAPPEND(_vgModuleLocal_,    str)
  55 #else
  56 #  error Unknown OS
  57 #endif
  58
  59 /* Let the linker know we don't need an executable stack.
  60    The call to MARK_STACK_NO_EXEC should be put unconditionally
  61    at the end of all asm source files.
  62 */
  63 #if defined(VGO_linux)
  64 #  if defined(VGA_arm)
  65 #    define MARK_STACK_NO_EXEC .section .note.GNU-stack,"",%progbits
  66 #  else
  67 #    define MARK_STACK_NO_EXEC .section .note.GNU-stack,"",@progbits
  68 #  endif
  69 #else
  70 #  define MARK_STACK_NO_EXEC
  71 #endif
  72
  73 #endif /* __PUB_TOOL_BASICS_ASM_H */
  74
  75 /*--------------------------------------------------------------------*/
  76 /*--- end                                                          ---*/
  77 /*--------------------------------------------------------------------*/