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