f0556e70bb
_mcount() stub when profiling is enabled. Emit this code sequence for assembly routines as welli (MCOUNT definition in <machine/asm.h>. We do not pass the GOT entry however as the 4th argument, because it's not used. The _mcount() stub calls __mcount(), which does the actual work. Define _MCOUNT_DECL to define __mcount. We do not have an implementation of mcount(), so we define MCOUNT as empty, but have a weak alias to _mcount() in _mcount.S. Note that the _mcount() stub in the kernel is slightly different from the stub in userland. This is because we do not have to worry about nested routines in the kernel.
189 lines
3.8 KiB
C
189 lines
3.8 KiB
C
/* $FreeBSD$ */
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/* From: NetBSD: asm.h,v 1.18 1997/11/03 04:22:06 ross Exp */
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/*
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* Copyright (c) 1991,1990,1989,1994,1995,1996 Carnegie Mellon University
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* All Rights Reserved.
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*
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* Permission to use, copy, modify and distribute this software and its
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* 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 FOR
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* 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 Mellon
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* the rights to redistribute these changes.
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*/
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/*
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* Assembly coding style
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*
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* This file contains macros and register defines to
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* aid in writing more readable assembly code.
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* Some rules to make assembly code understandable by
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* a debugger are also noted.
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*/
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/*
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* Macro to make a local label name.
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*/
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#define LLABEL(name,num) L ## name ## num
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/*
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* MCOUNT
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*/
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#if defined(GPROF)
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#define MCOUNT \
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alloc out0 = ar.pfs, 8, 0, 4, 0; \
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mov out1 = r1; \
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mov out2 = b0;; \
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mov out3 = r0; \
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br.call.sptk b0 = _mcount;;
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#else
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#define MCOUNT /* nothing */
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#endif
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/*
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* ENTRY
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* Declare a global leaf function.
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* A leaf function does not call other functions.
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*/
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#define ENTRY(_name_, _n_args_) \
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.global _name_; \
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.align 16; \
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.proc _name_; \
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_name_:; \
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.regstk _n_args_, 0, 0, 0; \
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MCOUNT
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#define ENTRY_NOPROFILE(_name_, _n_args_) \
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.global _name_; \
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.align 16; \
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.proc _name_; \
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_name_:; \
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.regstk _n_args_, 0, 0, 0
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/*
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* STATIC_ENTRY
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* Declare a local leaf function.
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*/
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#define STATIC_ENTRY(_name_, _n_args_) \
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.align 16; \
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.proc _name_; \
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_name_:; \
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.regstk _n_args_, 0, 0, 0 \
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MCOUNT
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/*
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* XENTRY
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* Global alias for a leaf function, or alternate entry point
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*/
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#define XENTRY(_name_) \
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.globl _name_; \
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_name_:
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/*
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* STATIC_XENTRY
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* Local alias for a leaf function, or alternate entry point
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*/
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#define STATIC_XENTRY(_name_) \
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_name_:
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/*
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* END
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* Function delimiter
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*/
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#define END(_name_) \
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.endp _name_
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/*
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* EXPORT
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* Export a symbol
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*/
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#define EXPORT(_name_) \
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.global _name_; \
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_name_:
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/*
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* IMPORT
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* Make an external name visible, typecheck the size
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*/
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#define IMPORT(_name_, _size_) \
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/* .extern _name_,_size_ */
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/*
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* ABS
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* Define an absolute symbol
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*/
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#define ABS(_name_, _value_) \
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.globl _name_; \
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_name_ = _value_
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/*
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* BSS
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* Allocate un-initialized space for a global symbol
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*/
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#define BSS(_name_,_numbytes_) \
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.comm _name_,_numbytes_
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/*
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* MSG
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* Allocate space for a message (a read-only ascii string)
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*/
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#define ASCIZ .asciz
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#define MSG(msg,reg,label) \
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addl reg,@ltoff(label),gp;; \
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ld8 reg=[reg];; \
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.data; \
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label: ASCIZ msg; \
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.text;
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/*
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* System call glue.
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*/
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#define SYSCALLNUM(name) SYS_ ## name
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#define CALLSYS_NOERROR(name) \
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{ .mmi ; \
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alloc r9 = ar.pfs, 0, 0, 8, 0 ; \
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mov r31 = ar.k5 ; \
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mov r10 = b0 ;; } \
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{ .mib ; \
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mov r8 = SYSCALLNUM(name) ; \
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mov b7 = r31 ; \
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br.call.sptk b0 = b7 ;; }
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/*
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* WEAK_ALIAS: create a weak alias (ELF only).
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*/
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#define WEAK_ALIAS(alias,sym) \
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.weak alias; \
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alias = sym
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/*
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* ID tag macros
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*/
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#if !defined(lint) && !defined(STRIP_FBSDID)
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#define __FBSDID(s) .ident s
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#else
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#define __FBSDID(s) /* nothing */
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#endif /* not lint and not STRIP_FBSDID */
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