master
1/* $NetBSD: profile.h,v 1.18 2018/01/24 09:04:45 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}"); \
80 __asm("pop {pc}"); \
81 __asm(".size " MCOUNT_ASM_NAME ", .-" MCOUNT_ASM_NAME);
82#elif defined(__ARM_DWARF_EH__)
83#define MCOUNT \
84 __asm(".text"); \
85 __asm(".align 0"); \
86 __asm(".arm"); \
87 __asm(".type " MCOUNT_ASM_NAME ",%function"); \
88 __asm(".global " MCOUNT_ASM_NAME); \
89 __asm(MCOUNT_ASM_NAME ":"); \
90 __asm(".cfi_startproc"); \
91 /* \
92 * Preserve registers that are trashed during mcount \
93 */ \
94 __asm("push {r0-r3, ip, lr}"); \
95 __asm(".cfi_def_cfa_offset 24"); \
96 __asm(".cfi_offset 14, -4"); \
97 __asm(".cfi_offset 12, -8"); \
98 __asm(".cfi_offset 3, -12"); \
99 __asm(".cfi_offset 2, -16"); \
100 __asm(".cfi_offset 1, -20"); \
101 __asm(".cfi_offset 0, -24"); \
102 /* \
103 * find the return address for mcount, \
104 * and the return address for mcount's caller. \
105 * \
106 * frompcindex = pc pushed by call into self. \
107 */ \
108 __asm("mov r0, ip"); \
109 /* \
110 * selfpc = pc pushed by mcount call \
111 */ \
112 __asm("mov r1, lr"); \
113 /* \
114 * Call the real mcount code \
115 */ \
116 __asm("bl " ___STRING(_C_LABEL(_mcount)) PLTSYM); \
117 /* \
118 * Restore registers that were trashed during mcount \
119 */ \
120 __asm("pop {r0-r3, lr}"); \
121 __asm("pop {pc}"); \
122 __asm(".cfi_endproc"); \
123 __asm(".size " MCOUNT_ASM_NAME ", .-" MCOUNT_ASM_NAME);
124#else
125#define MCOUNT \
126 __asm(".text"); \
127 __asm(".align 0"); \
128 __asm(".arm"); \
129 __asm(".type " MCOUNT_ASM_NAME ",%function"); \
130 __asm(".global " MCOUNT_ASM_NAME); \
131 __asm(MCOUNT_ASM_NAME ":"); \
132 __asm(".fnstart"); \
133 __asm(".cfi_startproc"); \
134 /* \
135 * Preserve registers that are trashed during mcount \
136 */ \
137 __asm("push {r0-r3, ip, lr}"); \
138 __asm(".save {r0-r3, lr}"); \
139 __asm(".cfi_def_cfa_offset 24"); \
140 __asm(".cfi_offset 14, -4"); \
141 __asm(".cfi_offset 12, -8"); \
142 __asm(".cfi_offset 3, -12"); \
143 __asm(".cfi_offset 2, -16"); \
144 __asm(".cfi_offset 1, -20"); \
145 __asm(".cfi_offset 0, -24"); \
146 /* \
147 * find the return address for mcount, \
148 * and the return address for mcount's caller. \
149 * \
150 * frompcindex = pc pushed by call into self. \
151 */ \
152 __asm("mov r0, ip"); \
153 /* \
154 * selfpc = pc pushed by mcount call \
155 */ \
156 __asm("mov r1, lr"); \
157 /* \
158 * Call the real mcount code \
159 */ \
160 __asm("bl " ___STRING(_C_LABEL(_mcount)) PLTSYM); \
161 /* \
162 * Restore registers that were trashed during mcount \
163 */ \
164 __asm("pop {r0-r3, lr}"); \
165 __asm("pop {pc}"); \
166 __asm(".cfi_endproc"); \
167 __asm(".fnend"); \
168 __asm(".size " MCOUNT_ASM_NAME ", .-" MCOUNT_ASM_NAME);
169#endif
170
171#ifdef _KERNEL
172#include <arm/cpufunc.h>
173/*
174 * splhigh() and splx() are heavyweight, and call mcount(). Therefore
175 * we disabled interrupts (IRQ, but not FIQ) directly on the CPU.
176 *
177 * We're lucky that the CPSR and 's' both happen to be 'int's.
178 */
179#define MCOUNT_ENTER s = __set_cpsr_c(0x0080, 0x0080); /* kill IRQ */
180#define MCOUNT_EXIT __set_cpsr_c(0xffffffff, s); /* restore old value */
181#endif /* _KERNEL */