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31 * @(#)profile.h 8.1 (Berkeley) 6/11/93
35 #ifndef _MACHINE_PROFILE_H_
36 #define _MACHINE_PROFILE_H_
39 #error this file needs sys/cdefs.h as a prerequisite
45 * Config generates something to tell the compiler to align functions on 16
46 * byte boundaries. A strict alignment is good for keeping the tables small.
48 #define FUNCTION_ALIGNMENT 16
51 * The kernel uses assembler stubs instead of unportable inlines.
52 * This is mainly to save a little time when profiling is not enabled,
53 * which is the usual case for the kernel.
55 #define _MCOUNT_DECL void mcount
59 #define MCOUNT_DECL(s)
60 #define MCOUNT_ENTER(s)
61 #define MCOUNT_EXIT(s)
63 #define MCOUNT_OVERHEAD(label) \
64 __asm __volatile("pushl %0; call __mcount; popl %%ecx" \
67 : "ax", "dx", "cx", "memory")
68 #define MEXITCOUNT_OVERHEAD() \
69 __asm __volatile("call .mexitcount; 1:" \
71 : "ax", "dx", "cx", "memory")
72 #define MEXITCOUNT_OVERHEAD_GETLABEL(labelp) \
73 __asm __volatile("movl $1b,%0" : "=rm" (labelp))
76 #endif /* !__GNUCLIKE_ASM */
78 #define MCOUNT_DECL(s) register_t s;
80 extern int mcount_lock;
81 #define MCOUNT_ENTER(s) { s = intr_disable(); \
82 while (!atomic_cmpset_acq_int(&mcount_lock, 0, 1)) \
84 #define MCOUNT_EXIT(s) { atomic_store_rel_int(&mcount_lock, 0); \
87 #define MCOUNT_ENTER(s) { s = intr_disable(); }
88 #define MCOUNT_EXIT(s) (intr_restore(s))
97 #define MCOUNT_FROMPC_USER(pc) \
98 ((pc < (uintfptr_t)VM_MAXUSER_ADDRESS) ? (uintfptr_t)user : pc)
100 #define MCOUNT_FROMPC_INTR(pc) \
101 ((pc >= (uintfptr_t)btrap && pc < (uintfptr_t)eintr) ? \
102 ((pc >= (uintfptr_t)bintr) ? (uintfptr_t)bintr : \
103 (uintfptr_t)btrap) : ~0U)
107 #define FUNCTION_ALIGNMENT 4
109 #define _MCOUNT_DECL static __inline void _mcount
111 #ifdef __GNUCLIKE_ASM
116 uintfptr_t selfpc, frompc, ecx; \
118 * In gcc 4.2, ecx might be used in the caller as the arg \
119 * pointer if the stack realignment option is set (-mstackrealign) \
120 * or if the caller has the force_align_arg_pointer attribute \
121 * (stack realignment is ALWAYS on for main). Preserve ecx \
124 __asm("" : "=c" (ecx)); \
126 * Find the return address for mcount, \
127 * and the return address for mcount's caller. \
129 * selfpc = pc pushed by call to mcount \
131 __asm("movl 4(%%ebp),%0" : "=r" (selfpc)); \
133 * frompc = pc pushed by call to mcount's caller. \
134 * The caller's stack frame has already been built, so %ebp is \
135 * the caller's frame pointer. The caller's raddr is in the \
136 * caller's frame following the caller's caller's frame pointer.\
138 __asm("movl (%%ebp),%0" : "=r" (frompc)); \
139 frompc = ((uintfptr_t *)frompc)[1]; \
140 _mcount(frompc, selfpc); \
141 __asm("" : : "c" (ecx)); \
143 #else /* !__GNUCLIKE_ASM */
145 #endif /* __GNUCLIKE_ASM */
147 typedef u_int uintfptr_t;
152 * An unsigned integral type that can hold non-negative difference between
155 typedef u_int fptrdiff_t;
159 void mcount(uintfptr_t frompc, uintfptr_t selfpc);
163 #include <sys/cdefs.h>
166 #ifdef __GNUCLIKE_ASM
167 void mcount(void) __asm(".mcount");
173 #endif /* !_MACHINE_PROFILE_H_ */