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