/* $NetBSD: asm.h,v 1.25 2025/01/06 10:46:44 martin 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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 _ASM_H_
#define _ASM_H_
/* Pull in CCFSZ, CC64FSZ, and BIAS from frame.h */
#ifndef _LOCORE
#define _LOCORE
#endif
#include <machine/frame.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
#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.
*
* We can use two code sequences. We can read the %pc or use the call
* instruction that saves the pc in %o7. Call requires the branch unit and
* IEU1, and clobbers %o7 which needs to be restored. This instruction
* sequence takes about 4 cycles due to instruction interdependence. Reading
* the pc takes 4 cycles to dispatch and is always dispatched alone. That
* sequence takes 7 cycles.
*/
#ifdef __arch64__
#define PIC_PROLOGUE(dest,tmp) \
mov %o7, tmp; \
sethi %hi(_GLOBAL_OFFSET_TABLE_-4),dest; \
call 0f; \
or dest,%lo(_GLOBAL_OFFSET_TABLE_+4),dest; \
0: \
add dest,%o7,dest; \
mov tmp, %o7
#else
#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
#endif
/*
* 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.
*/
#ifdef __arch64__
#define PICCY_SET(var,dest,tmp) \
3: rd %pc, tmp; add tmp,(var-3b),dest
#else
#define PICCY_SET(var,dest,tmp) \
mov %o7,tmp; 3: call 4f; nop; 4: \
add %o7,(var-3b),dest; mov tmp,%o7
#endif
#else
#define PIC_PROLOGUE(dest,tmp)
#define PICCY_OFFSET(var,dest,tmp)
#endif
