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/* $OpenBSD: asm.h,v 1.5 2011/03/23 16:54:37 pirofti Exp $ */
/* $NetBSD: asm.h,v 1.5 1997/07/16 15:16:43 christos Exp $ */
/*
* Copyright (c) 1994 Allen Briggs
* All rights reserved.
*
* Gleaned from locore.s and sun3 asm.h which had the following copyrights:
* locore.s:
* Copyright (c) 1988 University of Utah.
* Copyright (c) 1982, 1990 The Regents of the University of California.
* sun3/include/asm.h:
* Copyright (c) 1993 Adam Glass
* Copyright (c) 1990 The Regents of the University of California.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef _MACHINE_ASM_H_
#define _MACHINE_ASM_H_
#ifdef __ELF__
#define _C_LABEL(name) name
#else
#ifdef __STDC__
#define _C_LABEL(name) _ ## name
#else
#define _C_LABEL(name) _/**/name
#endif
#endif
#define _ASM_LABEL(name) name
/*
* WEAK_ALIAS: create a weak alias (ELF only)
*/
#ifdef __ELF__
#define WEAK_ALIAS(alias,sym) \
.weak alias; \
alias = sym
#endif
/*
* WARN_REFERENCES: create a warning if the specified symbol is referenced
* (ELF only).
*/
#ifdef __ELF__
#define WARN_REFERENCES(_sym,_msg) \
.section .gnu.warning. ## _sym ; .ascii _msg ; .text
#endif /* __ELF__ */
#ifdef PIC
/*
* PIC_PROLOGUE() is akin to the compiler generated function prologue for
* PIC code. It leaves the address of the Global Offset Table in DEST,
* clobbering register TMP in the process. Using the temporary enables us
* to work without a stack frame (doing so requires saving %o7) .
*/
#define PIC_PROLOGUE(dest,tmp) \
mov %o7,tmp; 3: call 4f; nop; 4: \
sethi %hi(_C_LABEL(_GLOBAL_OFFSET_TABLE_)-(3b-.)),dest; \
or dest,%lo(_C_LABEL(_GLOBAL_OFFSET_TABLE_)-(3b-.)),dest; \
add dest,%o7,dest; mov tmp,%o7
/*
* PICCY_SET() does the equivalent of a `set var, %dest' instruction in
* a PIC-like way, but without involving the Global Offset Table. This
* only works for VARs defined in the same file *and* in the text segment.
*/
#define PICCY_SET(var,dest,tmp) \
mov %o7,tmp; 3: call 4f; nop; 4: \
add %o7,(var-3b),dest; mov tmp,%o7
#else
#define PIC_PROLOGUE(dest,tmp)
#define PICCY_OFFSET(var,dest,tmp)
#endif
#define FTYPE(x) .type x,@function
#define OTYPE(x) .type x,@object
#define _ENTRY(name) \
.align 4; .globl name; .proc 1; FTYPE(name); name:
#ifdef GPROF
#define _PROF_PROLOGUE \
.data; .align 4; 1: .long 0; \
.text; save %sp,-96,%sp; sethi %hi(1b),%o0; call mcount; \
or %o0,%lo(1b),%o0; restore
#else
#define _PROF_PROLOGUE
#endif
#define ENTRY(name) _ENTRY(_C_LABEL(name)); _PROF_PROLOGUE
#define ASENTRY(name) _ENTRY(_ASM_LABEL(name)); _PROF_PROLOGUE
#define FUNC(name) ASENTRY(name)
#define ASMSTR .asciz
#define RCSID(name) .asciz name
#endif /* _MACHINE_ASM_H_ */
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