libsanitizer/sanitizer_common/sanitizer_asm.h

   1 //===-- sanitizer_asm.h -----------------------------------------*- C++ -*-===//
   2 //
   3 // This file is distributed under the University of Illinois Open Source
   4 // License. See LICENSE.TXT for details.
   5 //
   6 //===----------------------------------------------------------------------===//
   7 //
   8 // Various support for assemebler.
   9 //
  10 //===----------------------------------------------------------------------===//
  11
  12 // Some toolchains do not support .cfi asm directives, so we have to hide
  13 // them inside macros.
  14 #if defined(__clang__) ||                                                      \
  15     (defined(__GNUC__) && defined(__GCC_HAVE_DWARF2_CFI_ASM))
  16   // GCC defined __GCC_HAVE_DWARF2_CFI_ASM if it supports CFI.
  17   // Clang seems to support CFI by default (or not?).
  18   // We need two versions of macros: for inline asm and standalone asm files.
  19 # define CFI_INL_ADJUST_CFA_OFFSET(n) ".cfi_adjust_cfa_offset " #n ";"
  20
  21 # define CFI_STARTPROC .cfi_startproc
  22 # define CFI_ENDPROC .cfi_endproc
  23 # define CFI_ADJUST_CFA_OFFSET(n) .cfi_adjust_cfa_offset n
  24 # define CFI_REL_OFFSET(reg, n) .cfi_rel_offset reg, n
  25 # define CFI_DEF_CFA_REGISTER(reg) .cfi_def_cfa_register reg
  26 # define CFI_RESTORE(reg) .cfi_restore reg
  27
  28 #else  // No CFI
  29 # define CFI_INL_ADJUST_CFA_OFFSET(n)
  30 # define CFI_STARTPROC
  31 # define CFI_ENDPROC
  32 # define CFI_ADJUST_CFA_OFFSET(n)
  33 # define CFI_REL_OFFSET(reg, n)
  34 # define CFI_DEF_CFA_REGISTER(reg)
  35 # define CFI_RESTORE(reg)
  36 #endif