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147 lines
4.7 KiB
C
147 lines
4.7 KiB
C
/*-
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* Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
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* All rights reserved.
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*
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* Author: Chris G. Demetriou
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*
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* Permission to use, copy, modify and distribute this software and
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* its documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
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* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*
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* from: NetBSD: profile.h,v 1.9 1997/04/06 08:47:37 cgd Exp
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* from: FreeBSD: src/sys/alpha/include/profile.h,v 1.4 1999/12/29
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* $FreeBSD$
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*/
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#ifndef _MACHINE_PROFILE_H_
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#define _MACHINE_PROFILE_H_
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#define _MCOUNT_DECL void __mcount
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#define FUNCTION_ALIGNMENT 16
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typedef u_int fptrdiff_t;
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/*
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* The mcount trampoline macro, expanded in libc/gmon/mcount.c
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*
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* For PowerPC SVR4 ABI profiling, the compiler will insert
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* a data declaration and code sequence at the start of a routine of the form
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*
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* .function_mc: .data
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* .align 2
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* .long 0
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* .text
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*
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* function: mflr %r0
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* addis %r11,%r0, .function_mc@ha
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* stw %r0,4(%r1)
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* addi %r0,%r11, .function_mc@l
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* bl _mcount
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*
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* The link register is saved in the LR save word in the caller's
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* stack frame, r0 is set up to point to the allocated longword,
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* and control is transferred to _mcount.
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*
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* On return from _mcount, the routine should function as it would
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* with no profiling so _mcount must restore register state to that upon
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* entry. Any routine called by the _mcount trampoline will save
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* callee-save registers, so _mcount must make sure it saves volatile
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* registers that may have state after it returns i.e. parameter registers.
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*
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* The FreeBSD libc mcount routine ignores the r0 longword pointer, but
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* instead requires as parameters the current PC and called PC. The current
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* PC is obtained from the link register, as a result of "bl _mcount" in
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* the stub, while the caller's PC is obtained from the LR save word.
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*
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* On return from libc mcount, the return is done indirectly with the
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* ctr register rather than the link register, to allow the link register
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* to be restored to what it was on entry to the profiled routine.
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*/
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#ifdef PIC
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#define _PLT "@plt"
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#else
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#define _PLT
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#endif
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#define MCOUNT \
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__asm(" .globl _mcount \n" \
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" .type _mcount,@function \n" \
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"_mcount: \n" \
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" stwu %r1,-64(%r1) /* alloca for reg save space */ \n" \
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" stw %r3,16(%r1) /* save parameter registers, */ \n" \
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" stw %r4,20(%r1) /* r3-10 */ \n" \
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" stw %r5,24(%r1) \n" \
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" stw %r6,28(%r1) \n" \
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" stw %r7,32(%r1) \n" \
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" stw %r8,36(%r1) \n" \
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" stw %r9,40(%r1) \n" \
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" stw %r10,44(%r1) \n" \
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" \n" \
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" mflr %r4 /* link register is 'selfpc' */ \n" \
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" stw %r4,48(%r1) /* save since bl will scrub */ \n" \
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" lwz %r3,68(%r1) /* get 'frompc' from LR-save */ \n" \
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" bl __mcount" _PLT " /* __mcount(frompc, selfpc)*/ \n" \
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" lwz %r3,68(%r1) \n" \
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" mtlr %r3 /* restore caller's lr */ \n" \
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" lwz %r4,48(%r1) \n" \
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" mtctr %r4 /* set up ctr for call back */ \n" \
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" /* note that blr is not used!*/ \n" \
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" lwz %r3,16(%r1) /* restore r3-10 parameters */ \n" \
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" lwz %r4,20(%r1) \n" \
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" lwz %r5,24(%r1) \n" \
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" lwz %r6,28(%r1) \n" \
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" lwz %r7,32(%r1) \n" \
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" lwz %r8,36(%r1) \n" \
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" lwz %r9,40(%r1) \n" \
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" lwz %r10,44(%r1) \n" \
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" addi %r1,%r1,64 /* blow away alloca save area */ \n" \
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" bctr /* return with indirect call */ \n" \
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"_mcount_end: \n" \
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" .size _mcount,_mcount_end-_mcount");
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#ifdef _KERNEL
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#define MCOUNT_ENTER(s) s = intr_disable();
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#define MCOUNT_EXIT(s) intr_restore(s);
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#define MCOUNT_DECL(s) register_t s
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void bintr(void);
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void btrap(void);
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void eintr(void);
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void user(void);
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#define MCOUNT_FROMPC_USER(pc) \
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((pc < (uintfptr_t)VM_MAXUSER_ADDRESS) ? (uintfptr_t)user : pc)
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#define MCOUNT_FROMPC_INTR(pc) \
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((pc >= (uintfptr_t)btrap && pc < (uintfptr_t)eintr) ? \
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((pc >= (uintfptr_t)bintr) ? (uintfptr_t)bintr : \
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(uintfptr_t)btrap) : ~0U)
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#else /* !_KERNEL */
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typedef u_int uintfptr_t;
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#endif /* _KERNEL */
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#endif /* !_MACHINE_PROFILE_H_ */
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