1/*-
  2 * SPDX-License-Identifier: BSD-4-Clause
  3 *
  4 * Copyright (C) 1995, 1996 Wolfgang Solfrank.
  5 * Copyright (C) 1995, 1996 TooLs GmbH.
  6 * All rights reserved.
  7 *
  8 * Redistribution and use in source and binary forms, with or without
  9 * modification, are permitted provided that the following conditions
 10 * are met:
 11 * 1. Redistributions of source code must retain the above copyright
 12 *    notice, this list of conditions and the following disclaimer.
 13 * 2. Redistributions in binary form must reproduce the above copyright
 14 *    notice, this list of conditions and the following disclaimer in the
 15 *    documentation and/or other materials provided with the distribution.
 16 * 3. All advertising materials mentioning features or use of this software
 17 *    must display the following acknowledgement:
 18 *	This product includes software developed by TooLs GmbH.
 19 * 4. The name of TooLs GmbH may not be used to endorse or promote products
 20 *    derived from this software without specific prior written permission.
 21 *
 22 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
 23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 25 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 27 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 28 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 29 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 30 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 31 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 32 *
 33 *	$NetBSD: frame.h,v 1.2 1999/01/10 10:13:15 tsubai Exp $
 34 */
 35
 36#ifndef	_MACHINE_FRAME_H_
 37#define	_MACHINE_FRAME_H_
 38
 39#include <sys/types.h>
 40
 41/*
 42 * We have to save all registers on every trap, because
 43 *	1. user could attach this process every time
 44 *	2. we must be able to restore all user registers in case of fork
 45 * Actually, we do not save the fp registers on trap, since
 46 * these are not used by the kernel. They are saved only when switching
 47 * between processes using the FPU.
 48 *
 49 * Change ordering to cluster together these register_t's.		XXX
 50 */
 51struct trapframe {
 52	register_t fixreg[32];
 53	register_t lr;
 54	register_t cr;
 55	register_t xer;
 56	register_t ctr;
 57	register_t srr0;
 58	register_t srr1;
 59	register_t exc;
 60	register_t dar;	/* DAR/DEAR filled in on DSI traps */
 61	union {
 62		struct {
 63			/* dsisr only filled on a DSI trap */
 64			register_t dsisr;
 65		} aim;
 66		struct {
 67			register_t esr;
 68			register_t dbcr0;
 69		} booke;
 70	} cpu;
 71};
 72
 73/*
 74 * FRAMELEN is the size of the stack region used by the low-level trap
 75 * handler. It is the size of its data (trapframe) plus the callframe
 76 * header (sizeof(struct callframe) - 3 register widths). It must also
 77 * be 16-byte aligned.
 78 */
 79#define	FRAMELEN	roundup(sizeof(struct trapframe) + \
 80			    sizeof(struct callframe) - 3*sizeof(register_t), 16)
 81#define	trapframe(td)	((td)->td_frame)
 82
 83/*
 84 * Call frame for PowerPC used during fork.
 85 */
 86#ifdef __powerpc64__
 87struct callframe {
 88	register_t	cf_dummy_fp;	/* dummy frame pointer */
 89	register_t	cf_cr;
 90	register_t	cf_lr;
 91	register_t	cf_compiler;
 92	register_t	cf_linkeditor;
 93	register_t	cf_toc;
 94	register_t	cf_func;
 95	register_t	cf_arg0;
 96	register_t	cf_arg1;
 97	register_t	_padding;	/* Maintain 16-byte alignment */
 98};
 99#else
100struct callframe {
101	register_t	cf_dummy_fp;	/* dummy frame pointer */
102	register_t	cf_lr;		/* space for link register save */
103	register_t	cf_func;
104	register_t	cf_arg0;
105	register_t	cf_arg1;
106	register_t	_padding;	/* Maintain 16-byte alignment */
107};
108#endif
109
110/* Definitions for syscalls */
111#define	FIRSTARG	3				/* first arg in reg 3 */
112#define	NARGREG		8				/* 8 args in regs */
113
114#endif	/* _MACHINE_FRAME_H_ */