2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1992, 1993
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31 * @(#)profile.h 8.1 (Berkeley) 6/11/93
35 #ifndef _MACHINE_PROFILE_H_
36 #define _MACHINE_PROFILE_H_
40 #include <sys/cdefs.h>
42 #define FUNCTION_ALIGNMENT 4
44 #define _MCOUNT_DECL static __inline void _mcount
50 uintfptr_t selfpc, frompc, ecx; \
52 * In gcc 4.2, ecx might be used in the caller as the arg \
53 * pointer if the stack realignment option is set (-mstackrealign) \
54 * or if the caller has the force_align_arg_pointer attribute \
55 * (stack realignment is ALWAYS on for main). Preserve ecx \
58 __asm("" : "=c" (ecx)); \
60 * Find the return address for mcount, \
61 * and the return address for mcount's caller. \
63 * selfpc = pc pushed by call to mcount \
65 __asm("movl 4(%%ebp),%0" : "=r" (selfpc)); \
67 * frompc = pc pushed by call to mcount's caller. \
68 * The caller's stack frame has already been built, so %ebp is \
69 * the caller's frame pointer. The caller's raddr is in the \
70 * caller's frame following the caller's caller's frame pointer.\
72 __asm("movl (%%ebp),%0" : "=r" (frompc)); \
73 frompc = ((uintfptr_t *)frompc)[1]; \
74 _mcount(frompc, selfpc); \
75 __asm("" : : "c" (ecx)); \
78 typedef u_int uintfptr_t;
81 * An unsigned integral type that can hold non-negative difference between
84 typedef u_int fptrdiff_t;
87 void mcount(void) __asm(".mcount");
92 #endif /* !_MACHINE_PROFILE_H_ */