2 * Copyright (c) 1992, 1993
3 * The Regents of the University of California. All rights reserved.
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6 * modification, are permitted provided that the following conditions
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14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
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33 * @(#)profile.h 8.1 (Berkeley) 6/11/93
34 * $FreeBSD: src/sys/amd64/include/profile.h,v 1.33 2004/01/06 20:36:21 nectar Exp $
37 #ifndef _CPU_PROFILE_H_
38 #define _CPU_PROFILE_H_
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.
46 #define FUNCTION_ALIGNMENT 16
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.
53 #define _MCOUNT_DECL void mcount
57 #define CALIB_SCALE 1000
58 #define KCOUNT(p,index) ((p)->kcount[(index) \
59 / (HISTFRACTION * sizeof(HISTCOUNTER))])
60 #define MCOUNT_DECL(s)
61 #define MCOUNT_ENTER(s)
62 #define MCOUNT_EXIT(s)
63 #define PC_TO_I(p, pc) ((uintfptr_t)(pc) - (uintfptr_t)(p)->lowpc)
65 #define MCOUNT_DECL(s) u_long s;
67 extern int mcount_lock;
68 #define MCOUNT_ENTER(s) { s = read_rflags(); disable_intr(); \
69 while (!atomic_cmpset_acq_int(&mcount_lock, 0, 1)) \
71 #define MCOUNT_EXIT(s) { atomic_store_rel_int(&mcount_lock, 0); \
74 #define MCOUNT_ENTER(s) { s = read_rflags(); disable_intr(); }
75 #define MCOUNT_EXIT(s) (write_rflags(s))
81 #define FUNCTION_ALIGNMENT 4
83 #define _MCOUNT_DECL static __inline void _mcount
90 uintfptr_t selfpc, frompc; \
92 * Find the return address for mcount, \
93 * and the return address for mcount's caller. \
95 * selfpc = pc pushed by call to mcount \
97 __asm("movq 8(%%rbp),%0" : "=r" (selfpc)); \
99 * frompc = pc pushed by call to mcount's caller. \
100 * The caller's stack frame has already been built, so %ebp is \
101 * the caller's frame pointer. The caller's raddr is in the \
102 * caller's frame following the caller's caller's frame pointer.\
104 __asm("movq (%%rbp),%0" : "=r" (frompc)); \
105 frompc = ((uintfptr_t *)frompc)[1]; \
106 _mcount(frompc, selfpc); \
114 #endif /* __GNUC__ */
116 typedef unsigned long uintfptr_t;
121 * An unsigned integral type that can hold non-negative difference between
124 typedef u_int fptrdiff_t;
128 void mcount(uintfptr_t frompc, uintfptr_t selfpc);
129 void kmupetext(uintfptr_t nhighpc);
134 void nullfunc_loop_profiled(void);
135 void nullfunc_profiled(void);
136 void startguprof(struct gmonparam *p);
137 void stopguprof(struct gmonparam *p);
139 #define startguprof(p)
140 #define stopguprof(p)
145 #include <sys/cdefs.h>
149 void mcount(void) __asm(".mcount");
156 /* XXX doesn't quite work outside kernel yet. */
157 extern int cputime_bias;
161 void empty_loop(void);
162 void mexitcount(uintfptr_t selfpc);
164 void nullfunc_loop(void);
168 #endif /* !_CPU_PROFILE_H_ */