209 lines
4.4 KiB
C
209 lines
4.4 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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* The document
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*
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* "ALPHA Calling Standard", DEC 27-Apr-90
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*
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* defines (a superset of) the rules and conventions
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* we use. While we make no promise of adhering to
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* such standard and its evolution (esp where we
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* can get faster code paths) it is certainly intended
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* that we be interoperable with such standard.
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*
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* In this sense, this file is a proper part of the
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* definition of the (software) Alpha architecture.
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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) && !defined(PROF)
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#define MCOUNT /* nothing */
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#else
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#define MCOUNT \
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br.call.sptk.many b7=_mcount
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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) \
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SYS_ ## name
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#define CALLSYS_NOERROR(name) \
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mov r15=SYSCALLNUM(name); \
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break 0x100000 ;;
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/*
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* WEAK_ALIAS: create a weak alias (ELF only).
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*/
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#ifdef __ELF__
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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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#endif
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/*
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* Kernel RCS ID tag and copyright macros
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*/
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#ifdef _KERNEL
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#ifdef __ELF__
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#define __KERNEL_SECTIONSTRING(_sec, _str) \
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.section _sec ; .asciz _str ; .text
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#else /* __ELF__ */
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#define __KERNEL_SECTIONSTRING(_sec, _str) \
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.data ; .asciz _str ; .align 3 ; .text
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#endif /* __ELF__ */
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#define __KERNEL_RCSID(_n, _s) __KERNEL_SECTIONSTRING(.ident, _s)
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#define __KERNEL_COPYRIGHT(_n, _s) __KERNEL_SECTIONSTRING(.copyright, _s)
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#ifdef NO_KERNEL_RCSIDS
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#undef __KERNEL_RCSID
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#define __KERNEL_RCSID(_n, _s) /* nothing */
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#endif
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#endif /* _KERNEL */
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