frame.h revision 316369 
1/*-
2 * Copyright (C) 1995, 1996 Wolfgang Solfrank.
3 * Copyright (C) 1995, 1996 TooLs GmbH.
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 * 3. All advertising materials mentioning features or use of this software
15 *    must display the following acknowledgement:
16 *	This product includes software developed by TooLs GmbH.
17 * 4. The name of TooLs GmbH may not be used to endorse or promote products
18 *    derived from this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
23 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
26 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
27 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
28 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
29 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 *
31 *	$NetBSD: frame.h,v 1.2 1999/01/10 10:13:15 tsubai Exp $
32 * $FreeBSD: stable/11/sys/powerpc/include/frame.h 316369 2017-04-01 19:27:06Z jhibbits $
33 */
34
35#ifndef	_MACHINE_FRAME_H_
36#define	_MACHINE_FRAME_H_
37
38#include <sys/types.h>
39
40/*
41 * We have to save all registers on every trap, because
42 *	1. user could attach this process every time
43 *	2. we must be able to restore all user registers in case of fork
44 * Actually, we do not save the fp registers on trap, since
45 * these are not used by the kernel. They are saved only when switching
46 * between processes using the FPU.
47 *
48 * Change ordering to cluster together these register_t's.		XXX
49 */
50struct trapframe {
51	register_t fixreg[32];
52	register_t lr;
53	register_t cr;
54	register_t xer;
55	register_t ctr;
56	register_t srr0;
57	register_t srr1;
58	register_t exc;
59	register_t dar;	/* DAR/DEAR filled in on DSI traps */
60	union {
61		struct {
62			/* dsisr only filled on a DSI trap */
63			register_t dsisr;
64		} aim;
65		struct {
66			register_t esr;
67			register_t dbcr0;
68		} booke;
69	} cpu;
70};
71
72/*
73 * FRAMELEN is the size of the stack region used by the low-level trap
74 * handler. It is the size of its data (trapframe) plus the callframe
75 * header (sizeof(struct callframe) - 3 register widths). It must also
76 * be 16-byte aligned.
77 */
78#define	FRAMELEN	roundup(sizeof(struct trapframe) + \
79			    sizeof(struct callframe) - 3*sizeof(register_t), 16)
80#define	trapframe(td)	((td)->td_frame)
81
82/*
83 * Call frame for PowerPC used during fork.
84 */
85#ifdef __powerpc64__
86struct callframe {
87	register_t	cf_dummy_fp;	/* dummy frame pointer */
88	register_t	cf_cr;
89	register_t	cf_lr;
90	register_t	cf_compiler;
91	register_t	cf_linkeditor;
92	register_t	cf_toc;
93	register_t	cf_func;
94	register_t	cf_arg0;
95	register_t	cf_arg1;
96	register_t	_padding;	/* Maintain 16-byte alignment */
97};
98#else
99struct callframe {
100	register_t	cf_dummy_fp;	/* dummy frame pointer */
101	register_t	cf_lr;		/* space for link register save */
102	register_t	cf_func;
103	register_t	cf_arg0;
104	register_t	cf_arg1;
105	register_t	_padding;	/* Maintain 16-byte alignment */
106};
107#endif
108
109/* Definitions for syscalls */
110#define	FIRSTARG	3				/* first arg in reg 3 */
111#define	NARGREG		8				/* 8 args in regs */
112
113#endif	/* _MACHINE_FRAME_H_ */
114