56f5947a71
All supported compilers (modern versions of GCC and clang) support this. Many places didn't have an #else so would just silently do the wrong thing. Ancient versions of icc (the original motivation for this) are no longer a compiler FreeBSD supports. PR: 263102 (exp-run) Reviewed by: brooks, imp Differential Revision: https://reviews.freebsd.org/D34797
92 lines
2.7 KiB
C
92 lines
2.7 KiB
C
/*-
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* SPDX-License-Identifier: MIT-CMU
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*
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* Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
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* All rights reserved.
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*
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* Author: Chris G. Demetriou
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*
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* Permission to use, copy, modify and distribute this software and
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* its documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
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* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*
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* from: NetBSD: profile.h,v 1.9 1997/04/06 08:47:37 cgd Exp
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* from: FreeBSD: src/sys/alpha/include/profile.h,v 1.4 1999/12/29
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* $FreeBSD$
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*/
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#ifndef _MACHINE_PROFILE_H_
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#define _MACHINE_PROFILE_H_
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#define FUNCTION_ALIGNMENT 32
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typedef u_long fptrdiff_t;
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#ifndef _KERNEL
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#include <sys/cdefs.h>
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typedef __uintfptr_t uintfptr_t;
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#define _MCOUNT_DECL \
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static void _mcount(uintfptr_t frompc, uintfptr_t selfpc) __used; \
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static void _mcount
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/*
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* Call into _mcount. On arm64 the .mcount is a function so callers will
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* handle caller saved registers. As we don't directly touch any callee
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* saved registers we can just load the two arguments and use a tail call
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* into the MI _mcount function.
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*
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* When building with gcc frompc will be in x0, however this is not the
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* case on clang. As such we need to load it from the stack. As long as
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* the caller follows the ABI this will load the correct value.
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*/
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#define MCOUNT __asm( \
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" .text \n" \
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" .align 6 \n" \
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" .type .mcount,#function \n" \
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" .globl .mcount \n" \
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" .mcount: \n" \
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" .cfi_startproc \n" \
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/* Load the caller return address as frompc */ \
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" ldr x0, [x29, #8] \n" \
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/* Use our return address as selfpc */ \
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" mov x1, lr \n" \
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" b _mcount \n" \
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" .cfi_endproc \n" \
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" .size .mcount, . - .mcount \n" \
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);
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#if 0
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/*
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* If clang passed frompc correctly we could implement it like this, however
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* all clang versions we care about would need to be fixed before we could
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* make this change.
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*/
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void
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mcount(uintfptr_t frompc)
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{
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_mcount(frompc, __builtin_return_address(0));
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}
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#endif
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#endif /* !_KERNEL */
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#endif /* !_MACHINE_PROFILE_H_ */
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