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2e38975e5a
To support cc -pg on arm64 we need to implement .mcount. As clang and
gcc think it is function like it just needs to load the arguments
to _mcount and call it.
On gcc the first argument is passed in x0, however this is missing on
clang so we need to load it from the stack. As it's the caller return
address this will be at a known location.
PR: 262709
Reviewed by: emaste (earlier version)
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D34634
(cherry picked from commit 16d5f9a164)
123 lines
3.4 KiB
C
123 lines
3.4 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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#if !defined(_KERNEL) && !defined(_SYS_CDEFS_H_)
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#error this file needs sys/cdefs.h as a prerequisite
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#endif
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#define FUNCTION_ALIGNMENT 32
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typedef u_long fptrdiff_t;
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#ifdef _KERNEL
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#include <machine/cpufunc.h>
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#define _MCOUNT_DECL void mcount
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#define MCOUNT
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#define MCOUNT_DECL(s) register_t s;
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#define MCOUNT_ENTER(s) {s = intr_disable(); }
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#define MCOUNT_EXIT(s) {intr_restore(s); }
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void bintr(void);
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void btrap(void);
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void eintr(void);
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void user(void);
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#define MCOUNT_FROMPC_USER(pc) \
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((pc < (uintfptr_t)VM_MAXUSER_ADDRESS) ? (uintfptr_t)user : pc)
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#define MCOUNT_FROMPC_INTR(pc) \
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((pc >= (uintfptr_t)btrap && pc < (uintfptr_t)eintr) ? \
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((pc >= (uintfptr_t)bintr) ? (uintfptr_t)bintr : \
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(uintfptr_t)btrap) : ~0UL)
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void mcount(uintfptr_t frompc, uintfptr_t selfpc);
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#else /* !_KERNEL */
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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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#ifdef __GNUCLIKE_ASM
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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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#else
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#define MCOUNT
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#endif
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#endif /* _KERNEL */
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#endif /* !_MACHINE_PROFILE_H_ */
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