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_DEF_CFA_OFFSET(n) .cfi_def_cfa_offset n 27# define CFI_REL_OFFSET(reg, n) .cfi_rel_offset reg, n 28# define CFI_OFFSET(reg, n) .cfi_offset reg, n 29# define CFI_DEF_CFA_REGISTER(reg) .cfi_def_cfa_register reg 30# define CFI_DEF_CFA(reg, n) .cfi_def_cfa reg, n 31# define CFI_RESTORE(reg) .cfi_restore reg 32 33#else // No CFI 34# define CFI_INL_ADJUST_CFA_OFFSET(n) 35# define CFI_STARTPROC 36# define CFI_ENDPROC 37# define CFI_ADJUST_CFA_OFFSET(n) 38# define CFI_DEF_CFA_OFFSET(n) 39# define CFI_REL_OFFSET(reg, n) 40# define CFI_OFFSET(reg, n) 41# define CFI_DEF_CFA_REGISTER(reg) 42# define CFI_DEF_CFA(reg, n) 43# define CFI_RESTORE(reg) 44#endif 45 46#if !defined(__APPLE__) 47# define ASM_HIDDEN(symbol) .hidden symbol 48# define ASM_TYPE_FUNCTION(symbol) .type symbol, @function 49# define ASM_SIZE(symbol) .size symbol, .-symbol 50# define ASM_TSAN_SYMBOL(symbol) symbol 51# define ASM_TSAN_SYMBOL_INTERCEPTOR(symbol) symbol 52#else 53# define ASM_HIDDEN(symbol) 54# define ASM_TYPE_FUNCTION(symbol) 55# define ASM_SIZE(symbol) 56# define ASM_TSAN_SYMBOL(symbol) _##symbol 57# define ASM_TSAN_SYMBOL_INTERCEPTOR(symbol) _wrap_##symbol 58#endif 59