2 * Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
5 * Author: Chris G. Demetriou
7 * Permission to use, copy, modify and distribute this software and
8 * its documentation is hereby granted, provided that both the copyright
9 * notice and this permission notice appear in all copies of the
10 * software, derivative works or modified versions, and any portions
11 * thereof, and that both notices appear in supporting documentation.
13 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
14 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
15 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
17 * Carnegie Mellon requests users of this software to return to
19 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
20 * School of Computer Science
21 * Carnegie Mellon University
22 * Pittsburgh PA 15213-3890
24 * any improvements or extensions that they make and grant Carnegie the
25 * rights to redistribute these changes.
27 * from: NetBSD: profile.h,v 1.9 1997/04/06 08:47:37 cgd Exp
28 * from: FreeBSD: src/sys/alpha/include/profile.h,v 1.4 1999/12/29
32 #ifndef _MACHINE_PROFILE_H_
33 #define _MACHINE_PROFILE_H_
35 #define _MCOUNT_DECL void __mcount
37 #define FUNCTION_ALIGNMENT 16
39 typedef u_int fptrdiff_t;
42 * The mcount trampoline macro, expanded in libc/gmon/mcount.c
44 * For PowerPC SVR4 ABI profiling, the compiler will insert
45 * a data declaration and code sequence at the start of a routine of the form
53 * addis %r11,%r0, .function_mc@ha
55 * addi %r0,%r11, .function_mc@l
58 * The link register is saved in the LR save word in the caller's
59 * stack frame, r0 is set up to point to the allocated longword,
60 * and control is transferred to _mcount.
62 * On return from _mcount, the routine should function as it would
63 * with no profiling so _mcount must restore register state to that upon
64 * entry. Any routine called by the _mcount trampoline will save
65 * callee-save registers, so _mcount must make sure it saves volatile
66 * registers that may have state after it returns i.e. parameter registers.
68 * The FreeBSD libc mcount routine ignores the r0 longword pointer, but
69 * instead requires as parameters the current PC and called PC. The current
70 * PC is obtained from the link register, as a result of "bl _mcount" in
71 * the stub, while the caller's PC is obtained from the LR save word.
73 * On return from libc mcount, the return is done indirectly with the
74 * ctr register rather than the link register, to allow the link register
75 * to be restored to what it was on entry to the profiled routine.
85 __asm(" .globl _mcount \n" \
86 " .type _mcount,@function \n" \
88 " stwu %r1,-64(%r1) /* alloca for reg save space */ \n" \
89 " stw %r3,16(%r1) /* save parameter registers, */ \n" \
90 " stw %r4,20(%r1) /* r3-10 */ \n" \
91 " stw %r5,24(%r1) \n" \
92 " stw %r6,28(%r1) \n" \
93 " stw %r7,32(%r1) \n" \
94 " stw %r8,36(%r1) \n" \
95 " stw %r9,40(%r1) \n" \
96 " stw %r10,44(%r1) \n" \
98 " mflr %r4 /* link register is 'selfpc' */ \n" \
99 " stw %r4,48(%r1) /* save since bl will scrub */ \n" \
100 " lwz %r3,68(%r1) /* get 'frompc' from LR-save */ \n" \
101 " bl __mcount" _PLT " /* __mcount(frompc, selfpc)*/ \n" \
102 " lwz %r3,68(%r1) \n" \
103 " mtlr %r3 /* restore caller's lr */ \n" \
104 " lwz %r4,48(%r1) \n" \
105 " mtctr %r4 /* set up ctr for call back */ \n" \
106 " /* note that blr is not used!*/ \n" \
107 " lwz %r3,16(%r1) /* restore r3-10 parameters */ \n" \
108 " lwz %r4,20(%r1) \n" \
109 " lwz %r5,24(%r1) \n" \
110 " lwz %r6,28(%r1) \n" \
111 " lwz %r7,32(%r1) \n" \
112 " lwz %r8,36(%r1) \n" \
113 " lwz %r9,40(%r1) \n" \
114 " lwz %r10,44(%r1) \n" \
115 " addi %r1,%r1,64 /* blow away alloca save area */ \n" \
116 " bctr /* return with indirect call */ \n" \
118 " .size _mcount,_mcount_end-_mcount");
122 #define MCOUNT_ENTER(s) s = intr_disable();
123 #define MCOUNT_EXIT(s) intr_restore(s);
124 #define MCOUNT_DECL(s) register_t s
131 #define MCOUNT_FROMPC_USER(pc) \
132 ((pc < (uintfptr_t)VM_MAXUSER_ADDRESS) ? (uintfptr_t)user : pc)
134 #define MCOUNT_FROMPC_INTR(pc) \
135 ((pc >= (uintfptr_t)btrap && pc < (uintfptr_t)eintr) ? \
136 ((pc >= (uintfptr_t)bintr) ? (uintfptr_t)bintr : \
137 (uintfptr_t)btrap) : ~0U)
142 typedef u_int uintfptr_t;
146 #endif /* !_MACHINE_PROFILE_H_ */