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