profile.h revision 1.8 
1/*	$NetBSD: profile.h,v 1.8 2008/08/29 19:08:29 matt Exp $	*/
2
3/*
4 * Copyright (c) 2001 Ben Harris
5 * Copyright (c) 1995-1996 Mark Brinicombe
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 Mark Brinicombe.
18 * 4. The name of the author may not be used to endorse or promote products
19 *    derived from this software without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32
33#define	_MCOUNT_DECL void _mcount
34
35/*
36 * Cannot implement mcount in C as GCC will trash the ip register when it
37 * pushes a trapframe. Pity we cannot insert assembly before the function
38 * prologue.
39 */
40
41#define MCOUNT_ASM_NAME "__mcount"
42#ifdef PIC
43#define	PLTSYM		"(PLT)"
44#endif
45
46#ifndef PLTSYM
47#define	PLTSYM
48#endif
49
50#define	MCOUNT								\
51	__asm(".text");						\
52	__asm(".align	0");						\
53	__asm(".type	" MCOUNT_ASM_NAME ",%function");		\
54	__asm(".global	" MCOUNT_ASM_NAME);			\
55	__asm(MCOUNT_ASM_NAME ":");					\
56	/*								\
57	 * Preserve registers that are trashed during mcount		\
58	 */								\
59	__asm("stmfd	sp!, {r0-r3, ip, lr}");				\
60	/* Check what mode we're in.  EQ => 32, NE => 26 */		\
61	__asm("teq	r0, r0");					\
62	__asm("teq	pc, r15");					\
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("moveq	r0, ip");					\
70	__asm("bicne	r0, ip, #0xfc000003");	       			\
71	/*								\
72	 * selfpc = pc pushed by mcount call				\
73	 */								\
74	__asm("moveq	r1, lr");					\
75	__asm("bicne	r1, lr, #0xfc000003");				\
76	/*								\
77	 * Call the real mcount code					\
78	 */								\
79	__asm("bl	" ___STRING(_C_LABEL(_mcount)) PLTSYM);		\
80	/*								\
81	 * Restore registers that were trashed during mcount		\
82	 */								\
83	__asm("ldmfd	sp!, {r0-r3, lr, pc}");
84
85#ifdef _KERNEL
86#ifdef __PROG26
87extern int int_off_save(void);
88extern void int_restore(int);
89#define	MCOUNT_ENTER	(s = int_off_save())
90#define	MCOUNT_EXIT	int_restore(s)
91#else
92#include <arm/cpufunc.h>
93/*
94 * splhigh() and splx() are heavyweight, and call mcount().  Therefore
95 * we disabled interrupts (IRQ, but not FIQ) directly on the CPU.
96 *
97 * We're lucky that the CPSR and 's' both happen to be 'int's.
98 */
99#define	MCOUNT_ENTER	s = __set_cpsr_c(0x0080, 0x0080);	/* kill IRQ */
100#define	MCOUNT_EXIT	__set_cpsr_c(0xffffffff, s);	/* restore old value */
101#endif /* !acorn26 */
102#endif /* _KERNEL */
103