1/*-
2 * SPDX-License-Identifier: BSD-4-Clause
3 *
4 * Copyright (c) 1992, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 *    must display the following acknowledgement:
17 *	This product includes software developed by the University of
18 *	California, Berkeley and its contributors.
19 * 4. Neither the name of the University nor the names of its contributors
20 *    may be used to endorse or promote products derived from this software
21 *    without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36#ifndef _MACHINE_PROFILE_H_
37#define	_MACHINE_PROFILE_H_
38
39/*
40 * Config generates something to tell the compiler to align functions on 32
41 * byte boundaries.  A strict alignment is good for keeping the tables small.
42 */
43#define	FUNCTION_ALIGNMENT	16
44
45#define	_MCOUNT_DECL void mcount
46
47typedef u_long	fptrdiff_t;
48
49/*
50 * Cannot implement mcount in C as GCC will trash the ip register when it
51 * pushes a trapframe. Pity we cannot insert assembly before the function
52 * prologue.
53 */
54
55#ifndef PLTSYM
56#define	PLTSYM
57#endif
58
59#define	MCOUNT								\
60	__asm__(".text");						\
61	__asm__(".align	2");						\
62	__asm__(".type	__mcount ,%function");				\
63	__asm__(".global	__mcount");				\
64	__asm__("__mcount:");						\
65	/*								\
66	 * Preserve registers that are trashed during mcount		\
67	 */								\
68	__asm__("stmfd	sp!, {r0-r3, ip, lr}");				\
69	/*								\
70	 * find the return address for mcount,				\
71	 * and the return address for mcount's caller.			\
72	 *								\
73	 * frompcindex = pc pushed by call into self.			\
74	 */								\
75	__asm__("mov	r0, ip");					\
76	/*								\
77	 * selfpc = pc pushed by mcount call				\
78	 */								\
79	__asm__("mov	r1, lr");					\
80	/*								\
81	 * Call the real mcount code					\
82	 */								\
83	__asm__("bl	mcount");					\
84	/*								\
85	 * Restore registers that were trashed during mcount		\
86	 */								\
87	__asm__("ldmfd	sp!, {r0-r3, lr}");				\
88	/*								\
89	 * Return to the caller. Loading lr and pc in one instruction	\
90	 * is deprecated on ARMv7 so we need this on its own.		\
91	 */								\
92	__asm__("ldmfd	sp!, {pc}");
93void bintr(void);
94void btrap(void);
95void eintr(void);
96void user(void);
97
98#define	MCOUNT_FROMPC_USER(pc)					\
99	((pc < (uintfptr_t)VM_MAXUSER_ADDRESS) ? (uintfptr_t)user : pc)
100
101#define	MCOUNT_FROMPC_INTR(pc)					\
102	((pc >= (uintfptr_t)btrap && pc < (uintfptr_t)eintr) ?	\
103	    ((pc >= (uintfptr_t)bintr) ? (uintfptr_t)bintr :	\
104		(uintfptr_t)btrap) : ~0U)
105
106#ifdef _KERNEL
107
108#define	MCOUNT_DECL(s)	register_t s;
109
110#include <machine/asm.h>
111#include <machine/cpufunc.h>
112#define	MCOUNT_ENTER(s)	{s = intr_disable(); }	/* kill IRQ */
113#define	MCOUNT_EXIT(s)	{intr_restore(s); }	/* restore old value */
114
115void	mcount(uintfptr_t frompc, uintfptr_t selfpc);
116
117#else
118typedef	u_int	uintfptr_t;
119#endif /* _KERNEL */
120
121#endif /* !_MACHINE_PROFILE_H_ */
122