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69 lines
2.6 KiB
69 lines
2.6 KiB
4 months ago
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//===-- sanitizer_asm.h -----------------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// Various support for assemebler.
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//
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//===----------------------------------------------------------------------===//
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// Some toolchains do not support .cfi asm directives, so we have to hide
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// them inside macros.
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#if defined(__clang__) || \
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(defined(__GNUC__) && defined(__GCC_HAVE_DWARF2_CFI_ASM))
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// GCC defined __GCC_HAVE_DWARF2_CFI_ASM if it supports CFI.
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// Clang seems to support CFI by default (or not?).
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// We need two versions of macros: for inline asm and standalone asm files.
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# define CFI_INL_ADJUST_CFA_OFFSET(n) ".cfi_adjust_cfa_offset " #n ";"
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# define CFI_STARTPROC .cfi_startproc
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# define CFI_ENDPROC .cfi_endproc
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# define CFI_ADJUST_CFA_OFFSET(n) .cfi_adjust_cfa_offset n
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# define CFI_DEF_CFA_OFFSET(n) .cfi_def_cfa_offset n
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# define CFI_REL_OFFSET(reg, n) .cfi_rel_offset reg, n
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# define CFI_OFFSET(reg, n) .cfi_offset reg, n
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# define CFI_DEF_CFA_REGISTER(reg) .cfi_def_cfa_register reg
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# define CFI_DEF_CFA(reg, n) .cfi_def_cfa reg, n
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# define CFI_RESTORE(reg) .cfi_restore reg
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#else // No CFI
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# define CFI_INL_ADJUST_CFA_OFFSET(n)
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# define CFI_STARTPROC
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# define CFI_ENDPROC
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# define CFI_ADJUST_CFA_OFFSET(n)
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# define CFI_DEF_CFA_OFFSET(n)
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# define CFI_REL_OFFSET(reg, n)
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# define CFI_OFFSET(reg, n)
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# define CFI_DEF_CFA_REGISTER(reg)
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# define CFI_DEF_CFA(reg, n)
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# define CFI_RESTORE(reg)
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#endif
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#if !defined(__APPLE__)
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# define ASM_HIDDEN(symbol) .hidden symbol
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# define ASM_TYPE_FUNCTION(symbol) .type symbol, %function
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# define ASM_SIZE(symbol) .size symbol, .-symbol
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# define ASM_SYMBOL(symbol) symbol
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# define ASM_SYMBOL_INTERCEPTOR(symbol) symbol
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# define ASM_WRAPPER_NAME(symbol) __interceptor_##symbol
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#else
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# define ASM_HIDDEN(symbol)
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# define ASM_TYPE_FUNCTION(symbol)
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# define ASM_SIZE(symbol)
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# define ASM_SYMBOL(symbol) _##symbol
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# define ASM_SYMBOL_INTERCEPTOR(symbol) _wrap_##symbol
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# define ASM_WRAPPER_NAME(symbol) __interceptor_##symbol
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#endif
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#if defined(__ELF__) && (defined(__GNU__) || defined(__FreeBSD__) || \
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defined(__Fuchsia__) || defined(__linux__))
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// clang-format off
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#define NO_EXEC_STACK_DIRECTIVE .section .note.GNU-stack,"",%progbits // NOLINT
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// clang-format on
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#else
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#define NO_EXEC_STACK_DIRECTIVE
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#endif
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