sys/powerpc/include/frame.h

root/sys/powerpc/include/frame.h
/*-
 * SPDX-License-Identifier: BSD-4-Clause
 *
 * Copyright (C) 1995, 1996 Wolfgang Solfrank.
 * Copyright (C) 1995, 1996 TooLs GmbH.
 * All rights reserved.
 *
 * 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 TooLs GmbH.
 * 4. The name of TooLs GmbH may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``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 TOOLS GMBH 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.
 *
 *      $NetBSD: frame.h,v 1.2 1999/01/10 10:13:15 tsubai Exp $
 */

#ifndef _MACHINE_FRAME_H_
#define _MACHINE_FRAME_H_

#include <sys/types.h>

/*
 * We have to save all registers on every trap, because
 *      1. user could attach this process every time
 *      2. we must be able to restore all user registers in case of fork
 * Actually, we do not save the fp registers on trap, since
 * these are not used by the kernel. They are saved only when switching
 * between processes using the FPU.
 *
 * Change ordering to cluster together these register_t's.              XXX
 */
struct trapframe {
        register_t fixreg[32];
        register_t lr;
        register_t cr;
        register_t xer;
        register_t ctr;
        register_t srr0;
        register_t srr1;
        register_t exc;
        register_t dar; /* DAR/DEAR filled in on DSI traps */
        union {
                struct {
                        /* dsisr only filled on a DSI trap */
                        register_t dsisr;
                } aim;
                struct {
                        register_t esr;
                        register_t dbcr0;
                } booke;
        } cpu;
};

/*
 * FRAMELEN is the size of the stack region used by the low-level trap
 * handler. It is the size of its data (trapframe) plus the callframe
 * header (sizeof(struct callframe) - 3 register widths). It must also
 * be 16-byte aligned.
 */
#define FRAMELEN        roundup(sizeof(struct trapframe) + \
                            sizeof(struct callframe) - 3*sizeof(register_t), 16)
#define trapframe(td)   ((td)->td_frame)

/*
 * Call frame for PowerPC used during fork.
 */
#ifdef __powerpc64__
struct callframe {
        register_t      cf_dummy_fp;    /* dummy frame pointer */
        register_t      cf_cr;
        register_t      cf_lr;
        register_t      cf_compiler;
        register_t      cf_linkeditor;
        register_t      cf_toc;
        register_t      cf_func;
        register_t      cf_arg0;
        register_t      cf_arg1;
        register_t      _padding;       /* Maintain 16-byte alignment */
};
#else
struct callframe {
        register_t      cf_dummy_fp;    /* dummy frame pointer */
        register_t      cf_lr;          /* space for link register save */
        register_t      cf_func;
        register_t      cf_arg0;
        register_t      cf_arg1;
        register_t      _padding;       /* Maintain 16-byte alignment */
};
#endif

/* Definitions for syscalls */
#define FIRSTARG        3                               /* first arg in reg 3 */
#define NARGREG         8                               /* 8 args in regs */

#endif  /* _MACHINE_FRAME_H_ */
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