profile.h

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    1 /*-
    2  * SPDX-License-Identifier: MIT-CMU
    3  *
    4  * Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
    5  * All rights reserved.
    6  *
    7  * Author: Chris G. Demetriou
    8  * 
    9  * Permission to use, copy, modify and distribute this software and
   10  * its documentation is hereby granted, provided that both the copyright
   11  * notice and this permission notice appear in all copies of the
   12  * software, derivative works or modified versions, and any portions
   13  * thereof, and that both notices appear in supporting documentation.
   14  * 
   15  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 
   16  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND 
   17  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
   18  * 
   19  * Carnegie Mellon requests users of this software to return to
   20  *
   21  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
   22  *  School of Computer Science
   23  *  Carnegie Mellon University
   24  *  Pittsburgh PA 15213-3890
   25  *
   26  * any improvements or extensions that they make and grant Carnegie the
   27  * rights to redistribute these changes.
   28  *
   29  *      from: NetBSD: profile.h,v 1.9 1997/04/06 08:47:37 cgd Exp
   30  *      from: FreeBSD: src/sys/alpha/include/profile.h,v 1.4 1999/12/29
   31  * $FreeBSD$
   32  */
   33 
   34 #ifndef _MACHINE_PROFILE_H_
   35 #define _MACHINE_PROFILE_H_
   36 
   37 #define FUNCTION_ALIGNMENT      32
   38 
   39 typedef u_long  fptrdiff_t;
   40 
   41 #ifndef _KERNEL
   42 
   43 #include <sys/cdefs.h>
   44 
   45 typedef __uintfptr_t    uintfptr_t;
   46 
   47 #define _MCOUNT_DECL \
   48 static void _mcount(uintfptr_t frompc, uintfptr_t selfpc) __used; \
   49 static void _mcount
   50 
   51 /*
   52  * Call into _mcount. On arm64 the .mcount is a function so callers will
   53  * handle caller saved registers. As we don't directly touch any callee
   54  * saved registers we can just load the two arguments and use a tail call
   55  * into the MI _mcount function.
   56  *
   57  * When building with gcc frompc will be in x0, however this is not the
   58  * case on clang. As such we need to load it from the stack. As long as
   59  * the caller follows the ABI this will load the correct value.
   60  */
   61 #define MCOUNT __asm(                                   \
   62 "       .text                                   \n"     \
   63 "       .align  6                               \n"     \
   64 "       .type   .mcount,#function               \n"     \
   65 "       .globl  .mcount                         \n"     \
   66 "       .mcount:                                \n"     \
   67 "       .cfi_startproc                          \n"     \
   68         /* Load the caller return address as frompc */  \
   69 "       ldr     x0, [x29, #8]                   \n"     \
   70         /* Use our return address as selfpc */          \
   71 "       mov     x1, lr                          \n"     \
   72 "       b       _mcount                         \n"     \
   73 "       .cfi_endproc                            \n"     \
   74 "       .size   .mcount, . - .mcount            \n"     \
   75         );
   76 #if 0
   77 /*
   78  * If clang passed frompc correctly we could implement it like this, however
   79  * all clang versions we care about would need to be fixed before we could
   80  * make this change.
   81  */
   82 void
   83 mcount(uintfptr_t frompc)
   84 {
   85         _mcount(frompc, __builtin_return_address(0));
   86 }
   87 #endif
   88 
   89 #endif /* !_KERNEL */
   90 
   91 #endif /* !_MACHINE_PROFILE_H_ */

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FreeBSD/Linux Kernel Cross Reference sys/arm64/include/profile.h

FreeBSD/Linux Kernel Cross Reference
sys/arm64/include/profile.h