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