1 /*-
2 * Copyright (c) 1992, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * @(#)profile.h 8.1 (Berkeley) 6/11/93
30 * $FreeBSD$
31 */
32
33 #ifndef _MACHINE_PROFILE_H_
34 #define _MACHINE_PROFILE_H_
35
36 #ifndef _SYS_CDEFS_H_
37 #error this file needs sys/cdefs.h as a prerequisite
38 #endif
39
40 #ifdef _KERNEL
41
42 /*
43 * Config generates something to tell the compiler to align functions on 16
44 * byte boundaries. A strict alignment is good for keeping the tables small.
45 */
46 #define FUNCTION_ALIGNMENT 16
47
48 /*
49 * The kernel uses assembler stubs instead of unportable inlines.
50 * This is mainly to save a little time when profiling is not enabled,
51 * which is the usual case for the kernel.
52 */
53 #define _MCOUNT_DECL void mcount
54 #define MCOUNT
55
56 #ifdef GUPROF
57 #define MCOUNT_DECL(s)
58 #define MCOUNT_ENTER(s)
59 #define MCOUNT_EXIT(s)
60 #ifdef __GNUCLIKE_ASM
61 #define MCOUNT_OVERHEAD(label) \
62 __asm __volatile("pushq %0; call __mcount; popq %%rcx" \
63 : \
64 : "i" (label) \
65 : "ax", "dx", "cx", "di", "si", "r8", "r9", "memory")
66 #define MEXITCOUNT_OVERHEAD() \
67 __asm __volatile("call .mexitcount; 1:" \
68 : : \
69 : "ax", "dx", "cx", "di", "si", "r8", "r9", "memory")
70 #define MEXITCOUNT_OVERHEAD_GETLABEL(labelp) \
71 __asm __volatile("movq $1b,%0" : "=rm" (labelp))
72 #elif defined(lint)
73 #define MCOUNT_OVERHEAD(label)
74 #define MEXITCOUNT_OVERHEAD()
75 #define MEXITCOUNT_OVERHEAD_GETLABEL()
76 #else
77 #error this file needs to be ported to your compiler
78 #endif /* !__GNUCLIKE_ASM */
79 #else /* !GUPROF */
80 #define MCOUNT_DECL(s) u_long s;
81 #ifdef SMP
82 extern int mcount_lock;
83 #define MCOUNT_ENTER(s) { s = read_rflags(); disable_intr(); \
84 while (!atomic_cmpset_acq_int(&mcount_lock, 0, 1)) \
85 /* nothing */ ; }
86 #define MCOUNT_EXIT(s) { atomic_store_rel_int(&mcount_lock, 0); \
87 write_rflags(s); }
88 #else
89 #define MCOUNT_ENTER(s) { s = read_rflags(); disable_intr(); }
90 #define MCOUNT_EXIT(s) (write_rflags(s))
91 #endif
92 #endif /* GUPROF */
93
94 void bintr(void);
95 void btrap(void);
96 void eintr(void);
97 void user(void);
98
99 #define MCOUNT_FROMPC_USER(pc) \
100 ((pc < (uintfptr_t)VM_MAXUSER_ADDRESS) ? (uintfptr_t)user : pc)
101
102 #define MCOUNT_FROMPC_INTR(pc) \
103 ((pc >= (uintfptr_t)btrap && pc < (uintfptr_t)eintr) ? \
104 ((pc >= (uintfptr_t)bintr) ? (uintfptr_t)bintr : \
105 (uintfptr_t)btrap) : ~0UL)
106
107 #else /* !_KERNEL */
108
109 #define FUNCTION_ALIGNMENT 4
110
111 #define _MCOUNT_DECL \
112 static void _mcount(uintfptr_t frompc, uintfptr_t selfpc) __used; \
113 static void _mcount
114
115 #ifdef __GNUCLIKE_ASM
116 #define MCOUNT __asm(" \n\
117 .text \n\
118 .p2align 4,0x90 \n\
119 .globl .mcount \n\
120 .type .mcount,@function \n\
121 .mcount: \n\
122 pushq %rdi \n\
123 pushq %rsi \n\
124 pushq %rdx \n\
125 pushq %rcx \n\
126 pushq %r8 \n\
127 pushq %r9 \n\
128 pushq %rax \n\
129 movq 8(%rbp),%rdi \n\
130 movq 7*8(%rsp),%rsi \n\
131 call _mcount \n\
132 popq %rax \n\
133 popq %r9 \n\
134 popq %r8 \n\
135 popq %rcx \n\
136 popq %rdx \n\
137 popq %rsi \n\
138 popq %rdi \n\
139 ret \n\
140 .size .mcount, . - .mcount");
141 #if 0
142 /*
143 * We could use this, except it doesn't preserve the registers that were
144 * being passed with arguments to the function that we were inserted
145 * into. I've left it here as documentation of what the code above is
146 * supposed to do.
147 */
148 #define MCOUNT \
149 void \
150 mcount() \
151 { \
152 uintfptr_t selfpc, frompc; \
153 /* \
154 * Find the return address for mcount, \
155 * and the return address for mcount's caller. \
156 * \
157 * selfpc = pc pushed by call to mcount \
158 */ \
159 __asm("movq 8(%%rbp),%0" : "=r" (selfpc)); \
160 /* \
161 * frompc = pc pushed by call to mcount's caller. \
162 * The caller's stack frame has already been built, so %rbp is \
163 * the caller's frame pointer. The caller's raddr is in the \
164 * caller's frame following the caller's caller's frame pointer.\
165 */ \
166 __asm("movq (%%rbp),%0" : "=r" (frompc)); \
167 frompc = ((uintfptr_t *)frompc)[1]; \
168 _mcount(frompc, selfpc); \
169 }
170 #endif
171 #else /* !__GNUCLIKE_ASM */
172 #define MCOUNT
173 #endif /* __GNUCLIKE_ASM */
174
175 typedef u_long uintfptr_t;
176
177 #endif /* _KERNEL */
178
179 /*
180 * An unsigned integral type that can hold non-negative difference between
181 * function pointers.
182 */
183 typedef u_long fptrdiff_t;
184
185 #ifdef _KERNEL
186
187 void mcount(uintfptr_t frompc, uintfptr_t selfpc);
188
189 #else /* !_KERNEL */
190
191 #include <sys/cdefs.h>
192
193 __BEGIN_DECLS
194 #ifdef __GNUCLIKE_ASM
195 void mcount(void) __asm(".mcount");
196 #endif
197 __END_DECLS
198
199 #endif /* _KERNEL */
200
201 #endif /* !_MACHINE_PROFILE_H_ */
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