profile.h revision 1.3 
1/*	$NetBSD: profile.h,v 1.3 2001/07/16 05:42:50 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#ifdef __ELF__
42#define MCOUNT_ASM_NAME "__mcount"
43#ifdef PIC
44#define	PLTSYM		"(PLT)"
45#endif
46#else
47#define MCOUNT_ASM_NAME "mcount"
48#endif
49
50#ifndef PLTSYM
51#define	PLTSYM
52#endif
53
54#define	MCOUNT								\
55	__asm__(".text");						\
56	__asm__(".align	0");						\
57	__asm__(".type	" MCOUNT_ASM_NAME ",%function");		\
58	__asm__(".global	" MCOUNT_ASM_NAME);			\
59	__asm__(MCOUNT_ASM_NAME ":");					\
60	/*								\
61	 * Preserve registers that are trashed during mcount		\
62	 */								\
63	__asm__("stmfd	sp!, {r0-r3, ip, lr}");				\
64	/* Check what mode we're in.  EQ => 32, NE => 26 */		\
65	__asm__("teq	r0, r0");					\
66	__asm__("teq	pc, r15");					\
67	/*								\
68	 * find the return address for mcount,				\
69	 * and the return address for mcount's caller.			\
70	 *								\
71	 * frompcindex = pc pushed by call into self.			\
72	 */								\
73	__asm__("moveq	r0, ip");					\
74	__asm__("bicne	r0, ip, #0xfc000003");	       			\
75	/*								\
76	 * selfpc = pc pushed by mcount call				\
77	 */								\
78	__asm__("moveq	r1, lr");					\
79	__asm__("bicne	r1, lr, #0xfc000003");				\
80	/*								\
81	 * Call the real mcount code					\
82	 */								\
83	__asm__("bl	" ___STRING(_C_LABEL(_mcount)) PLTSYM);		\
84	/*								\
85	 * Restore registers that were trashed during mcount		\
86	 */								\
87	__asm__("ldmfd	sp!, {r0-r3, lr, pc}");
88
89#ifdef _KERNEL
90#ifdef arm26
91extern int int_off_save(void);
92extern void int_restore(int);
93#define	MCOUNT_ENTER	(s = int_off_save())
94#define	MCOUNT_EXIT	int_restore(s)
95#else
96#include <machine/cpufunc.h>
97/*
98 * splhigh() and splx() are heavyweight, and call mcount().  Therefore
99 * we disabled interrupts (IRQ, but not FIQ) directly on the CPU.
100 *
101 * We're lucky that the CPSR and 's' both happen to be 'int's.
102 */
103#define	MCOUNT_ENTER	s = SetCPSR(0x0080, 0x0080);	/* set IRQ disable bit */
104#define	MCOUNT_EXIT	SetCPSR(0xffffffff, s);		/* restore old value */
105#endif /* !arm26 */
106#endif /* _KERNEL */
107