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profile.h revision 1.2 
      1 /* $NetBSD: profile.h,v 1.2 2020/04/23 23:22:41 jakllsch Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2014 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Matt Thomas of 3am Software Foundry.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #ifdef __aarch64__
     33 
     34 #define	_MCOUNT_DECL void _mcount
     35 
     36 /*
     37  * Cannot implement mcount in C as GCC will trash the ip register when it
     38  * pushes a trapframe. Pity we cannot insert assembly before the function
     39  * prologue.
     40  */
     41 
     42 #define MCOUNT_ASM_NAME "__mcount"
     43 #define	PLTSYM
     44 
     45 #define	MCOUNT								\
     46 	__asm(".text");							\
     47 	__asm(".align	0");						\
     48 	__asm(".type	" MCOUNT_ASM_NAME ",@function");		\
     49 	__asm(".global	" MCOUNT_ASM_NAME);				\
     50 	__asm(MCOUNT_ASM_NAME ":");					\
     51 	/*								\
     52 	 * Preserve registers that are trashed during mcount		\
     53 	 */								\
     54 	__asm("stp	x29, x30, [sp, #-80]!");			\
     55 	__asm("stp	x0, x1, [sp, #16]");				\
     56 	__asm("stp	x2, x3, [sp, #32]");				\
     57 	__asm("stp	x4, x5, [sp, #48]");				\
     58 	__asm("stp	x6, x7, [sp, #64]");				\
     59 	/*								\
     60 	 * find the return address for mcount,				\
     61 	 * and the return address for mcount's caller.			\
     62 	 *								\
     63 	 * frompcindex = pc pushed by call into self.			\
     64 	 */								\
     65 	__asm("ldr	x0, [x29, #8]");				\
     66 	/*								\
     67 	 * selfpc = pc pushed by mcount call				\
     68 	 */								\
     69 	__asm("mov	x1, x30");					\
     70 	/*								\
     71 	 * Call the real mcount code					\
     72 	 */								\
     73 	__asm("bl	" ___STRING(_C_LABEL(_mcount)));		\
     74 	/*								\
     75 	 * Restore registers that were trashed during mcount		\
     76 	 */								\
     77 	__asm("ldp	x0, x1, [sp, #16]");				\
     78 	__asm("ldp	x2, x3, [sp, #32]");				\
     79 	__asm("ldp	x4, x5, [sp, #48]");				\
     80 	__asm("ldp	x6, x7, [sp, #64]");				\
     81 	__asm("ldp	x29, x30, [sp], #80");				\
     82 	__asm("ret");							\
     83 	__asm(".size	" MCOUNT_ASM_NAME ", .-" MCOUNT_ASM_NAME);
     84 
     85 #elif defined(__arm__)
     86 
     87 #include <arm/profile.h>
     88 
     89 #endif
     90 
     91