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