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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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C
1234567891011121314151617181920212223242526272829303132333435363738/* SPDX-License-Identifier: GPL-2.0 */#ifndef _LINUX_INSTRUCTION_POINTER_H#define _LINUX_INSTRUCTION_POINTER_H
#include <asm/linkage.h>
#define _RET_IP_ (unsigned long)__builtin_return_address(0)
#ifndef _THIS_IP_#define _THIS_IP_ ({ __label__ __here; __here: (unsigned long)&&__here; })/* * The current generic definition of _THIS_IP_ is considered broken by GCC [1] * and Clang [2]. In particular, the address of a label is only expected to be * used with a computed goto. * * [1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120071 * [2] https://github.com/llvm/llvm-project/issues/138272 * * Mark it as broken, so that appropriate fallback options can be implemented * for architectures that do not define their own _THIS_IP_. */#define HAS_BROKEN_THIS_IP#endif
/* * _CODE_LOCATION_ provides a unique identifier for the current code location. * When _THIS_IP_ is broken (generic version), we fall back to a static marker * which guarantees uniqueness and resolves to a constant address at link time, * avoiding runtime overhead and compiler optimizations breaking it. */#ifdef HAS_BROKEN_THIS_IP#define _CODE_LOCATION_ ({ static const char __here; (unsigned long)&__here; })#else#define _CODE_LOCATION_ _THIS_IP_#endif
#endif /* _LINUX_INSTRUCTION_POINTER_H */