Differential D34797 Diff 104915 sys/arm64/include/profile.h

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sys/arm64/include/profile.h

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	#include <sys/cdefs.h>			#include <sys/cdefs.h>

	typedef __uintfptr_t uintfptr_t;			typedef __uintfptr_t uintfptr_t;

	#define _MCOUNT_DECL \			#define _MCOUNT_DECL \
	static void _mcount(uintfptr_t frompc, uintfptr_t selfpc) __used; \			static void _mcount(uintfptr_t frompc, uintfptr_t selfpc) __used; \
	static void _mcount			static void _mcount

	#ifdef __GNUCLIKE_ASM
	/*			/*
	* Call into _mcount. On arm64 the .mcount is a function so callers will			* Call into _mcount. On arm64 the .mcount is a function so callers will
	* handle caller saved registers. As we don't directly touch any callee			* handle caller saved registers. As we don't directly touch any callee
	* saved registers we can just load the two arguments and use a tail call			* saved registers we can just load the two arguments and use a tail call
	* into the MI _mcount function.			* into the MI _mcount function.
	*			*
	* When building with gcc frompc will be in x0, however this is not the			* When building with gcc frompc will be in x0, however this is not the
	* case on clang. As such we need to load it from the stack. As long as			* case on clang. As such we need to load it from the stack. As long as
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	* all clang versions we care about would need to be fixed before we could			* all clang versions we care about would need to be fixed before we could
	* make this change.			* make this change.
	*/			*/
	void			void
	mcount(uintfptr_t frompc)			mcount(uintfptr_t frompc)
	{			{
	_mcount(frompc, __builtin_return_address(0));			_mcount(frompc, __builtin_return_address(0));
	}			}
	#endif
	#else
	#define MCOUNT
	#endif			#endif

	#endif /* !_KERNEL */			#endif /* !_KERNEL */

	#endif /* !_MACHINE_PROFILE_H_ */			#endif /* !_MACHINE_PROFILE_H_ */