1//===-- sanitizer_asm.h -----------------------------------------*- C++ -*-===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// Various support for assemebler. 11// 12//===----------------------------------------------------------------------===// 13 14// Some toolchains do not support .cfi asm directives, so we have to hide 15// them inside macros. 16#if defined(__clang__) || \ 17 (defined(__GNUC__) && defined(__GCC_HAVE_DWARF2_CFI_ASM)) 18 // GCC defined __GCC_HAVE_DWARF2_CFI_ASM if it supports CFI. 19 // Clang seems to support CFI by default (or not?). 20 // We need two versions of macros: for inline asm and standalone asm files. 21# define CFI_INL_ADJUST_CFA_OFFSET(n) ".cfi_adjust_cfa_offset " #n ";" 22 23# define CFI_STARTPROC .cfi_startproc 24# define CFI_ENDPROC .cfi_endproc 25# define CFI_ADJUST_CFA_OFFSET(n) .cfi_adjust_cfa_offset n 26# define CFI_REL_OFFSET(reg, n) .cfi_rel_offset reg, n 27# define CFI_DEF_CFA_REGISTER(reg) .cfi_def_cfa_register reg 28# define CFI_RESTORE(reg) .cfi_restore reg 29 30#else // No CFI 31# define CFI_INL_ADJUST_CFA_OFFSET(n) 32# define CFI_STARTPROC 33# define CFI_ENDPROC 34# define CFI_ADJUST_CFA_OFFSET(n) 35# define CFI_REL_OFFSET(reg, n) 36# define CFI_DEF_CFA_REGISTER(reg) 37# define CFI_RESTORE(reg) 38#endif 39 40 41