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_DEF_CFA_OFFSET(n) .cfi_def_cfa_offset n 25# define CFI_REL_OFFSET(reg, n) .cfi_rel_offset reg, n 26# define CFI_OFFSET(reg, n) .cfi_offset reg, n 27# define CFI_DEF_CFA_REGISTER(reg) .cfi_def_cfa_register reg 28# define CFI_DEF_CFA(reg, n) .cfi_def_cfa reg, n 29# define CFI_RESTORE(reg) .cfi_restore reg 30 31#else // No CFI 32# define CFI_INL_ADJUST_CFA_OFFSET(n) 33# define CFI_STARTPROC 34# define CFI_ENDPROC 35# define CFI_ADJUST_CFA_OFFSET(n) 36# define CFI_DEF_CFA_OFFSET(n) 37# define CFI_REL_OFFSET(reg, n) 38# define CFI_OFFSET(reg, n) 39# define CFI_DEF_CFA_REGISTER(reg) 40# define CFI_DEF_CFA(reg, n) 41# define CFI_RESTORE(reg) 42#endif 43 44#if !defined(__APPLE__) 45# define ASM_HIDDEN(symbol) .hidden symbol 46# define ASM_TYPE_FUNCTION(symbol) .type symbol, @function 47# define ASM_SIZE(symbol) .size symbol, .-symbol 48# define ASM_SYMBOL(symbol) symbol 49# define ASM_SYMBOL_INTERCEPTOR(symbol) symbol 50#else 51# define ASM_HIDDEN(symbol) 52# define ASM_TYPE_FUNCTION(symbol) 53# define ASM_SIZE(symbol) 54# define ASM_SYMBOL(symbol) _##symbol 55# define ASM_SYMBOL_INTERCEPTOR(symbol) _wrap_##symbol 56#endif 57