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