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/* $OpenBSD: asm.h,v 1.2 2013/03/28 17:41:04 martynas Exp $ */
/* $NetBSD: asm.h,v 1.4 2006/08/30 11:14:23 cherry Exp $ */
/* -
* Copyright (c) 1991,1990,1989,1994,1995,1996 Carnegie Mellon University
* All Rights Reserved.
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie Mellon
* the rights to redistribute these changes.
*/
/*
* Assembly coding style
*
* This file contains macros and register defines to
* aid in writing more readable assembly code.
* Some rules to make assembly code understandable by
* a debugger are also noted.
*/
/*
* Macro to make a local label name.
*/
#define LLABEL(name,num) L ## name ## num
/*
* MCOUNT
*/
#if defined(GPROF)
#define MCOUNT \
alloc out0 = ar.pfs, 8, 0, 4, 0; \
mov out1 = r1; \
mov out2 = b0;; \
mov out3 = r0; \
br.call.sptk b0 = _mcount;;
#else
#define MCOUNT /* nothing */
#endif
/*
* ENTRY
* Declare a global leaf function.
* A leaf function does not call other functions.
*/
#define ENTRY(_name_, _n_args_) \
.global _name_; \
.align 16; \
.proc _name_; \
_name_:; \
.regstk _n_args_, 0, 0, 0; \
MCOUNT
#define ENTRY_NOPROFILE(_name_, _n_args_) \
.global _name_; \
.align 16; \
.proc _name_; \
_name_:; \
.regstk _n_args_, 0, 0, 0
/*
* STATIC_ENTRY
* Declare a local leaf function.
*/
#define STATIC_ENTRY(_name_, _n_args_) \
.align 16; \
.proc _name_; \
_name_:; \
.regstk _n_args_, 0, 0, 0 \
MCOUNT
/*
* XENTRY
* Global alias for a leaf function, or alternate entry point
*/
#define XENTRY(_name_) \
.globl _name_; \
_name_:
/*
* STATIC_XENTRY
* Local alias for a leaf function, or alternate entry point
*/
#define STATIC_XENTRY(_name_) \
_name_:
/*
* END
* Function delimiter
*/
#define END(_name_) \
.endp _name_
/*
* EXPORT
* Export a symbol
*/
#define EXPORT(_name_) \
.global _name_; \
_name_:
/*
* IMPORT
* Make an external name visible, typecheck the size
*/
#define IMPORT(_name_, _size_) \
/* .extern _name_,_size_ */
/*
* ABS
* Define an absolute symbol
*/
#define ABS(_name_, _value_) \
.globl _name_; \
_name_ = _value_
/*
* BSS
* Allocate un-initialized space for a global symbol
*/
#define BSS(_name_,_numbytes_) \
.comm _name_,_numbytes_
/*
* MSG
* Allocate space for a message (a read-only ascii string)
*/
#define ASCIZ .asciz
#define MSG(msg,reg,label) \
addl reg,@ltoff(label),gp;; \
ld8 reg=[reg];; \
.data; \
label: ASCIZ msg; \
.text;
/*
* System call glue.
*/
#define SYSCALLNUM(name) ___CONCAT(SYS_,name)
#define CALLSYS_NOERROR(name) \
{ .mmi ; \
alloc r9 = ar.pfs, 0, 0, 8, 0 ; \
mov r31 = ar.k5 ; \
mov r10 = b0 ;; } \
{ .mib ; \
mov r8 = SYSCALLNUM(name) ; \
mov b7 = r31 ; \
br.call.sptk b0 = b7 ;; }
/*
* STRONG_ALIAS, WEAK_ALIAS
* Create a strong or weak alias.
*/
#define STRONG_ALIAS(alias,sym) \
.global alias; \
alias = sym
#define WEAK_ALIAS(alias,sym) \
.weak alias; \
alias = sym
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