1 //===-- sanitizer_asm.h -----------------------------------------*- C++ -*-===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // Various support for assemebler. 10 // 11 //===----------------------------------------------------------------------===// 12 13 // Some toolchains do not support .cfi asm directives, so we have to hide 14 // them inside macros. 15 #if defined(__clang__) || \ 16 (defined(__GNUC__) && defined(__GCC_HAVE_DWARF2_CFI_ASM)) 17 // GCC defined __GCC_HAVE_DWARF2_CFI_ASM if it supports CFI. 18 // Clang seems to support CFI by default (or not?). 19 // We need two versions of macros: for inline asm and standalone asm files. 20 # define CFI_INL_ADJUST_CFA_OFFSET(n) ".cfi_adjust_cfa_offset " #n ";" 21 22 # define CFI_STARTPROC .cfi_startproc 23 # define CFI_ENDPROC .cfi_endproc 24 # define CFI_ADJUST_CFA_OFFSET(n) .cfi_adjust_cfa_offset n 25 # define CFI_DEF_CFA_OFFSET(n) .cfi_def_cfa_offset n 26 # define CFI_REL_OFFSET(reg, n) .cfi_rel_offset reg, n 27 # define CFI_OFFSET(reg, n) .cfi_offset reg, n 28 # define CFI_DEF_CFA_REGISTER(reg) .cfi_def_cfa_register reg 29 # define CFI_DEF_CFA(reg, n) .cfi_def_cfa reg, n 30 # define CFI_RESTORE(reg) .cfi_restore reg 31 32 #else // No CFI 33 # define CFI_INL_ADJUST_CFA_OFFSET(n) 34 # define CFI_STARTPROC 35 # define CFI_ENDPROC 36 # define CFI_ADJUST_CFA_OFFSET(n) 37 # define CFI_DEF_CFA_OFFSET(n) 38 # define CFI_REL_OFFSET(reg, n) 39 # define CFI_OFFSET(reg, n) 40 # define CFI_DEF_CFA_REGISTER(reg) 41 # define CFI_DEF_CFA(reg, n) 42 # define CFI_RESTORE(reg) 43 #endif 44 45 #if !defined(__APPLE__) 46 # define ASM_HIDDEN(symbol) .hidden symbol 47 # define ASM_TYPE_FUNCTION(symbol) .type symbol, %function 48 # define ASM_SIZE(symbol) .size symbol, .-symbol 49 # define ASM_SYMBOL(symbol) symbol 50 # define ASM_SYMBOL_INTERCEPTOR(symbol) symbol 51 # define ASM_WRAPPER_NAME(symbol) __interceptor_##symbol 52 #else 53 # define ASM_HIDDEN(symbol) 54 # define ASM_TYPE_FUNCTION(symbol) 55 # define ASM_SIZE(symbol) 56 # define ASM_SYMBOL(symbol) _##symbol 57 # define ASM_SYMBOL_INTERCEPTOR(symbol) _wrap_##symbol 58 # define ASM_WRAPPER_NAME(symbol) __interceptor_##symbol 59 #endif 60 61 #if defined(__ELF__) && (defined(__GNU__) || defined(__FreeBSD__) || \ 62 defined(__Fuchsia__) || defined(__linux__)) 63 // clang-format off 64 #define NO_EXEC_STACK_DIRECTIVE .section .note.GNU-stack,"",%progbits // NOLINT 65 // clang-format on 66 #else 67 #define NO_EXEC_STACK_DIRECTIVE 68 #endif 69