profile.h revision 1.16 
1/*	$NetBSD: profile.h,v 1.16 2014/11/28 15:37:02 skrll 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#define	PLTSYM
43
44#if !defined(__ARM_EABI__)
45#define	MCOUNT								\
46	__asm(".text");							\
47	__asm(".align	0");						\
48	__asm(".arm");							\
49	__asm(".type	" MCOUNT_ASM_NAME ",%function");		\
50	__asm(".global	" MCOUNT_ASM_NAME);				\
51	__asm(MCOUNT_ASM_NAME ":");					\
52	/*								\
53	 * Preserve registers that are trashed during mcount		\
54	 */								\
55	__asm("push	{r0-r3, ip, lr}");				\
56	/* Check what mode we're in.  EQ => 32, NE => 26 */		\
57	__asm("teq	r0, r0");					\
58	__asm("teq	pc, r15");					\
59	/*								\
60	 * find the return address for mcount,				\
61	 * and the return address for mcount's caller.			\
62	 *								\
63	 * frompcindex = pc pushed by call into self.			\
64	 */								\
65	__asm("moveq	r0, ip");					\
66	__asm("bicne	r0, ip, #0xfc000003");	       			\
67	/*								\
68	 * selfpc = pc pushed by mcount call				\
69	 */								\
70	__asm("moveq	r1, lr");					\
71	__asm("bicne	r1, lr, #0xfc000003");				\
72	/*								\
73	 * Call the real mcount code					\
74	 */								\
75	__asm("bl	" ___STRING(_C_LABEL(_mcount)) PLTSYM);		\
76	/*								\
77	 * Restore registers that were trashed during mcount		\
78	 */								\
79	__asm("pop	{r0-r3, lr, pc}");				\
80	__asm(".size	" MCOUNT_ASM_NAME ", .-" MCOUNT_ASM_NAME);
81#elif defined(__ARM_DWARF_EH__)
82#define	MCOUNT								\
83	__asm(".text");							\
84	__asm(".align	0");						\
85	__asm(".arm");							\
86	__asm(".type	" MCOUNT_ASM_NAME ",%function");		\
87	__asm(".global	" MCOUNT_ASM_NAME);				\
88	__asm(MCOUNT_ASM_NAME ":");					\
89	__asm(".cfi_startproc");					\
90	/*								\
91	 * Preserve registers that are trashed during mcount		\
92	 */								\
93	__asm("push	{r0-r3, ip, lr}");				\
94	__asm(".cfi_def_cfa_offset 24");				\
95	__asm(".cfi_offset 14, -4");					\
96	__asm(".cfi_offset 12, -8");					\
97	__asm(".cfi_offset 3, -12");					\
98	__asm(".cfi_offset 2, -16");					\
99	__asm(".cfi_offset 1, -20");					\
100	__asm(".cfi_offset 0, -24");					\
101	/*								\
102	 * find the return address for mcount,				\
103	 * and the return address for mcount's caller.			\
104	 *								\
105	 * frompcindex = pc pushed by call into self.			\
106	 */								\
107	__asm("mov	r0, ip");					\
108	/*								\
109	 * selfpc = pc pushed by mcount call				\
110	 */								\
111	__asm("mov	r1, lr");					\
112	/*								\
113	 * Call the real mcount code					\
114	 */								\
115	__asm("bl	" ___STRING(_C_LABEL(_mcount)) PLTSYM);		\
116	/*								\
117	 * Restore registers that were trashed during mcount		\
118	 */								\
119	__asm("pop	{r0-r3, lr, pc}");				\
120	__asm(".cfi_endproc");						\
121	__asm(".size	" MCOUNT_ASM_NAME ", .-" MCOUNT_ASM_NAME);
122#else
123#define	MCOUNT								\
124	__asm(".text");							\
125	__asm(".align	0");						\
126	__asm(".arm");							\
127	__asm(".type	" MCOUNT_ASM_NAME ",%function");		\
128	__asm(".global	" MCOUNT_ASM_NAME);				\
129	__asm(MCOUNT_ASM_NAME ":");					\
130	__asm(".fnstart");						\
131	__asm(".cfi_startproc");					\
132	/*								\
133	 * Preserve registers that are trashed during mcount		\
134	 */								\
135	__asm("push	{r0-r3, ip, lr}");				\
136	__asm(".save {r0-r3, lr}");					\
137	__asm(".cfi_def_cfa_offset 24");				\
138	__asm(".cfi_offset 14, -4");					\
139	__asm(".cfi_offset 12, -8");					\
140	__asm(".cfi_offset 3, -12");					\
141	__asm(".cfi_offset 2, -16");					\
142	__asm(".cfi_offset 1, -20");					\
143	__asm(".cfi_offset 0, -24");					\
144	/*								\
145	 * find the return address for mcount,				\
146	 * and the return address for mcount's caller.			\
147	 *								\
148	 * frompcindex = pc pushed by call into self.			\
149	 */								\
150	__asm("mov	r0, ip");					\
151	/*								\
152	 * selfpc = pc pushed by mcount call				\
153	 */								\
154	__asm("mov	r1, lr");					\
155	/*								\
156	 * Call the real mcount code					\
157	 */								\
158	__asm("bl	" ___STRING(_C_LABEL(_mcount)) PLTSYM);		\
159	/*								\
160	 * Restore registers that were trashed during mcount		\
161	 */								\
162	__asm("pop	{r0-r3, lr, pc}");				\
163	__asm(".cfi_endproc");						\
164	__asm(".fnend");						\
165	__asm(".size	" MCOUNT_ASM_NAME ", .-" MCOUNT_ASM_NAME);
166#endif
167
168#ifdef _KERNEL
169#ifdef __PROG26
170extern int int_off_save(void);
171extern void int_restore(int);
172#define	MCOUNT_ENTER	(s = int_off_save())
173#define	MCOUNT_EXIT	int_restore(s)
174#else
175#include <arm/cpufunc.h>
176/*
177 * splhigh() and splx() are heavyweight, and call mcount().  Therefore
178 * we disabled interrupts (IRQ, but not FIQ) directly on the CPU.
179 *
180 * We're lucky that the CPSR and 's' both happen to be 'int's.
181 */
182#define	MCOUNT_ENTER	s = __set_cpsr_c(0x0080, 0x0080);	/* kill IRQ */
183#define	MCOUNT_EXIT	__set_cpsr_c(0xffffffff, s);	/* restore old value */
184#endif /* !acorn26 */
185#endif /* _KERNEL */
186