1/* $OpenBSD: profile.h,v 1.5 2016/09/21 11:33:05 kettenis Exp $ */
2/* $NetBSD: profile.h,v 1.5 2002/03/24 15:49:40 bjh21 Exp $ */
3
4/*
5 * Copyright (c) 2001 Ben Harris
6 * Copyright (c) 1995-1996 Mark Brinicombe
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by Mark Brinicombe.
19 * 4. The name of the author may not be used to endorse or promote products
20 * derived from this software without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
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#ifdef __PIC__
44#define PLTSYM "(PLT)"
45#endif
46
47#ifndef PLTSYM
48#define PLTSYM
49#endif
50
51#define MCOUNT \
52 __asm__(".text"); \
53 __asm__(".align 2"); \
54 __asm__(".type " MCOUNT_ASM_NAME ",%function"); \
55 __asm__(".global " MCOUNT_ASM_NAME); \
56 __asm__(MCOUNT_ASM_NAME ":"); \
57 /* \
58 * Preserve registers that are trashed during mcount \
59 */ \
60 __asm__("stmfd sp!, {r0-r3, ip, lr}"); \
61 /* \
62 * find the return address for mcount, \
63 * and the return address for mcount's caller. \
64 * \
65 * frompcindex = pc pushed by call into self. \
66 */ \
67 __asm__("mov r0, ip"); \
68 /* \
69 * selfpc = pc pushed by mcount call \
70 */ \
71 __asm__("mov r1, lr"); \
72 /* \
73 * Call the real mcount code \
74 */ \
75 __asm__("bl " __STRING(_mcount) PLTSYM); \
76 /* \
77 * Restore registers that were trashed during mcount \
78 */ \
79 __asm__("ldmfd sp!, {r0-r3, lr, pc}");
80
81#ifdef _KERNEL
82#include <arm/cpufunc.h>
83/*
84 * splhigh() and splx() are heavyweight, and call mcount(). Therefore
85 * we disabled interrupts (IRQ, but not FIQ) directly on the CPU.
86 *
87 * We're lucky that the CPSR and 's' both happen to be 'int's.
88 */
89#define MCOUNT_ENTER s = __set_cpsr_c(0x0080, 0x0080); /* kill IRQ */
90#define MCOUNT_EXIT __set_cpsr_c(0xffffffff, s); /* restore old value */
91#endif /* _KERNEL */