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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)  register_t s;
81 #ifdef SMP
82 extern int      mcount_lock;
83 #define MCOUNT_ENTER(s) { s = intr_disable(); \
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                           intr_restore(s); }
88 #else
89 #define MCOUNT_ENTER(s) { s = intr_disable(); }
90 #define MCOUNT_EXIT(s)  (intr_restore(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_ */