1/* $NetBSD: profile.h,v 1.1 2014/08/10 05:47:38 matt 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#ifndef _OR1K_PROFILE_H_
33#define _OR1K_PROFILE_H_
34
35#define	_MCOUNT_DECL void _mcount
36
37/*
38 * Cannot implement mcount in C as GCC will trash the ip register when it
39 * pushes a trapframe. Pity we cannot insert assembly before the function
40 * prologue.
41 */
42
43#define MCOUNT_ASM_NAME "__mcount"
44#define	PLTSYM
45
46#if 0
47#define	MCOUNT								\
48	__asm(".text");							\
49	__asm(".align	0");						\
50	__asm(".type	" MCOUNT_ASM_NAME ",@function");		\
51	__asm(".global	" MCOUNT_ASM_NAME);				\
52	__asm(MCOUNT_ASM_NAME ":");					\
53	/*								\
54	 * Preserve registers that are trashed during mcount		\
55	 */								\
56	__asm("sub	sp, sp, #80");					\
57	__asm("stp	x29, x30, [sp, #64]");				\
58	__asm("add	x29, sp, #64");					\
59	__asm("stp	x0, x1, [x29, #0]");				\
60	__asm("stp	x2, x3, [x29, #16]");				\
61	__asm("stp	x4, x5, [x29, #32]");				\
62	__asm("stp	x6, x7, [x29, #48]");				\
63	/*								\
64	 * find the return address for mcount,				\
65	 * and the return address for mcount's caller.			\
66	 *								\
67	 * frompcindex = pc pushed by call into self.			\
68	 */								\
69	__asm("mov	x0, x19");					\
70	/*								\
71	 * selfpc = pc pushed by mcount call				\
72	 */								\
73	__asm("mov	x1, x30");					\
74	/*								\
75	 * Call the real mcount code					\
76	 */								\
77	__asm("bl	" ___STRING(_C_LABEL(_mcount)));		\
78	/*								\
79	 * Restore registers that were trashed during mcount		\
80	 */								\
81	__asm("ldp	x0, x1, [x29, #0]");				\
82	__asm("ldp	x2, x3, [x29, #16]");				\
83	__asm("ldp	x4, x5, [x29, #32]");				\
84	__asm("ldp	x6, x7, [x29, #48]");				\
85	__asm("ldp	x29, x30, [x29, #64]");				\
86	__asm("add	sp, sp, #80");					\
87	__asm("ret");							\
88	__asm(".size	" MCOUNT_ASM_NAME ", .-" MCOUNT_ASM_NAME);
89#endif
90
91#endif /* _OR1K_PROFILE_H_ */
92