d2ac277602
To make the interceptor implementation more flexible, allowing for 2 levels of indirection instead of just 1 in the current scheme (where the intercepted function aliases the interceptor implementation), introduce the notion of an interceptor "trampoline". A trampoline may be a real function (and not just an alias, where aliases of aliases do not work), which will simply forward to the interceptor implementation; the intercepted function will then alias the trampoline: func -[alias]-> trampoline -[call]-> interceptor Make the necessary changes to prepare for introducing real trampolines. This change does not yet introduce any real trampolines, and so trampoline == interceptor, and we currently still just have: func -[alias]-> interceptor NFC. Reviewed By: dvyukov, vitalybuka, MaskRay Differential Revision: https://reviews.llvm.org/D151316
54 lines
2.2 KiB
C++
54 lines
2.2 KiB
C++
//===-- interception_linux.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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// This file is a part of AddressSanitizer, an address sanity checker.
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//
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// Linux-specific interception methods.
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//===----------------------------------------------------------------------===//
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#if SANITIZER_LINUX || SANITIZER_FREEBSD || SANITIZER_NETBSD || \
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SANITIZER_SOLARIS
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#if !defined(INCLUDED_FROM_INTERCEPTION_LIB)
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# error "interception_linux.h should be included from interception library only"
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#endif
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#ifndef INTERCEPTION_LINUX_H
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#define INTERCEPTION_LINUX_H
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namespace __interception {
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bool InterceptFunction(const char *name, uptr *ptr_to_real, uptr func,
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uptr trampoline);
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bool InterceptFunction(const char *name, const char *ver, uptr *ptr_to_real,
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uptr func, uptr trampoline);
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} // namespace __interception
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#define INTERCEPT_FUNCTION_LINUX_OR_FREEBSD(func) \
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::__interception::InterceptFunction( \
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#func, \
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(::__interception::uptr *) & REAL(func), \
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(::__interception::uptr) & (func), \
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(::__interception::uptr) & TRAMPOLINE(func))
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// dlvsym is a GNU extension supported by some other platforms.
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#if SANITIZER_GLIBC || SANITIZER_FREEBSD || SANITIZER_NETBSD
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#define INTERCEPT_FUNCTION_VER_LINUX_OR_FREEBSD(func, symver) \
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::__interception::InterceptFunction( \
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#func, symver, \
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(::__interception::uptr *) & REAL(func), \
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(::__interception::uptr) & (func), \
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(::__interception::uptr) & TRAMPOLINE(func))
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#else
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#define INTERCEPT_FUNCTION_VER_LINUX_OR_FREEBSD(func, symver) \
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INTERCEPT_FUNCTION_LINUX_OR_FREEBSD(func)
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#endif // SANITIZER_GLIBC || SANITIZER_FREEBSD || SANITIZER_NETBSD
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#endif // INTERCEPTION_LINUX_H
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#endif // SANITIZER_LINUX || SANITIZER_FREEBSD || SANITIZER_NETBSD ||
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// SANITIZER_SOLARIS
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