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29 * @(#)profile.h 8.1 (Berkeley) 6/11/93
33 #ifndef _MACHINE_PROFILE_H_
34 #define _MACHINE_PROFILE_H_
37 #error this file needs sys/cdefs.h as a prerequisite
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 MCOUNT_DECL(s)
58 #define MCOUNT_ENTER(s)
59 #define MCOUNT_EXIT(s)
61 #define MCOUNT_OVERHEAD(label) \
62 __asm __volatile("pushl %0; call __mcount; popl %%ecx" \
65 : "ax", "dx", "cx", "memory")
66 #define MEXITCOUNT_OVERHEAD() \
67 __asm __volatile("call .mexitcount; 1:" \
69 : "ax", "dx", "cx", "memory")
70 #define MEXITCOUNT_OVERHEAD_GETLABEL(labelp) \
71 __asm __volatile("movl $1b,%0" : "=rm" (labelp))
73 #define MCOUNT_OVERHEAD(label)
74 #define MEXITCOUNT_OVERHEAD()
75 #define MEXITCOUNT_OVERHEAD_GETLABEL()
78 #endif /* !__GNUCLIKE_ASM */
80 #define MCOUNT_DECL(s) register_t s;
82 extern int mcount_lock;
83 #define MCOUNT_ENTER(s) { s = intr_disable(); \
84 while (!atomic_cmpset_acq_int(&mcount_lock, 0, 1)) \
86 #define MCOUNT_EXIT(s) { atomic_store_rel_int(&mcount_lock, 0); \
89 #define MCOUNT_ENTER(s) { s = intr_disable(); }
90 #define MCOUNT_EXIT(s) (intr_restore(s))
99 #define MCOUNT_FROMPC_USER(pc) \
100 ((pc < (uintfptr_t)VM_MAXUSER_ADDRESS) ? (uintfptr_t)user : pc)
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) : ~0U)
109 #define FUNCTION_ALIGNMENT 4
111 #define _MCOUNT_DECL static __inline void _mcount
113 #ifdef __GNUCLIKE_ASM
118 uintfptr_t selfpc, frompc, ecx; \
120 * In gcc 4.2, ecx might be used in the caller as the arg \
121 * pointer if the stack realignment option is set (-mstackrealign) \
122 * or if the caller has the force_align_arg_pointer attribute \
123 * (stack realignment is ALWAYS on for main). Preserve ecx \
126 __asm("" : "=c" (ecx)); \
128 * Find the return address for mcount, \
129 * and the return address for mcount's caller. \
131 * selfpc = pc pushed by call to mcount \
133 __asm("movl 4(%%ebp),%0" : "=r" (selfpc)); \
135 * frompc = pc pushed by call to mcount's caller. \
136 * The caller's stack frame has already been built, so %ebp is \
137 * the caller's frame pointer. The caller's raddr is in the \
138 * caller's frame following the caller's caller's frame pointer.\
140 __asm("movl (%%ebp),%0" : "=r" (frompc)); \
141 frompc = ((uintfptr_t *)frompc)[1]; \
142 _mcount(frompc, selfpc); \
143 __asm("" : : "c" (ecx)); \
145 #else /* !__GNUCLIKE_ASM */
147 #endif /* __GNUCLIKE_ASM */
149 typedef u_int uintfptr_t;
154 * An unsigned integral type that can hold non-negative difference between
157 typedef u_int fptrdiff_t;
161 void mcount(uintfptr_t frompc, uintfptr_t selfpc);
165 #include <sys/cdefs.h>
168 #ifdef __GNUCLIKE_ASM
169 void mcount(void) __asm(".mcount");
175 #endif /* !_MACHINE_PROFILE_H_ */