1/* $NetBSD: profile.h,v 1.4 2021/02/10 12:31:34 ryo 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"		/* gcc */
43#define MCOUNT_ASM_NAME_ALIAS "__mcount"	/* llvm */
44#define	PLTSYM
45
46#define	MCOUNT								\
47	__asm(".text");							\
48	__asm(".align	6");						\
49	__asm(".type	" MCOUNT_ASM_NAME ",@function");		\
50	__asm(".global	" MCOUNT_ASM_NAME);				\
51	__asm(".global	" MCOUNT_ASM_NAME_ALIAS);			\
52	__asm(MCOUNT_ASM_NAME ":");					\
53	__asm(MCOUNT_ASM_NAME_ALIAS ":");				\
54	/*								\
55	 * Preserve registers that are trashed during mcount		\
56	 */								\
57	__asm("stp	x29, x30, [sp, #-80]!");			\
58	__asm("stp	x0, x1, [sp, #16]");				\
59	__asm("stp	x2, x3, [sp, #32]");				\
60	__asm("stp	x4, x5, [sp, #48]");				\
61	__asm("stp	x6, x7, [sp, #64]");				\
62	/*								\
63	 * find the return address for mcount,				\
64	 * and the return address for mcount's caller.			\
65	 *								\
66	 * frompcindex = pc pushed by call into self.			\
67	 */								\
68	__asm("ldr	x0, [x29, #8]");				\
69	/*								\
70	 * selfpc = pc pushed by mcount call				\
71	 */								\
72	__asm("mov	x1, x30");					\
73	/*								\
74	 * Call the real mcount code					\
75	 */								\
76	__asm("bl	" ___STRING(_C_LABEL(mcount)));			\
77	/*								\
78	 * Restore registers that were trashed during mcount		\
79	 */								\
80	__asm("ldp	x0, x1, [sp, #16]");				\
81	__asm("ldp	x2, x3, [sp, #32]");				\
82	__asm("ldp	x4, x5, [sp, #48]");				\
83	__asm("ldp	x6, x7, [sp, #64]");				\
84	__asm("ldp	x29, x30, [sp], #80");				\
85	__asm("ret");							\
86	__asm(".size	" MCOUNT_ASM_NAME ", .-" MCOUNT_ASM_NAME);
87
88#ifdef _KERNEL
89#define MCOUNT_ENTER	\
90	__asm __volatile ("mrs %x0, daif; msr daifset, #3": "=r"(s):: "memory")
91#define MCOUNT_EXIT	\
92	__asm __volatile ("msr daif, %x0":: "r"(s): "memory")
93#endif /* _KERNEL */
94
95#elif defined(__arm__)
96
97#include <arm/profile.h>
98
99#endif