1/*	$NetBSD: mcontext.h,v 1.12 2020/10/04 10:34:18 rin Exp $	*/
  2
  3/*-
  4 * Copyright (c) 2001 The NetBSD Foundation, Inc.
  5 * All rights reserved.
  6 *
  7 * This code is derived from software contributed to The NetBSD Foundation
  8 * by Klaus Klein.
  9 *
 10 * Redistribution and use in source and binary forms, with or without
 11 * modification, are permitted provided that the following conditions
 12 * are met:
 13 * 1. Redistributions of source code must retain the above copyright
 14 *    notice, this list of conditions and the following disclaimer.
 15 * 2. Redistributions in binary form must reproduce the above copyright
 16 *    notice, this list of conditions and the following disclaimer in the
 17 *    documentation and/or other materials provided with the distribution.
 18 *
 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 29 * POSSIBILITY OF SUCH DAMAGE.
 30 */
 31
 32#ifndef _M68K_MCONTEXT_H_
 33#define _M68K_MCONTEXT_H_
 34
 35#ifdef _KERNEL
 36#include <m68k/cpuframe.h>
 37#endif
 38
 39/*
 40 * mcontext extensions to handle signal delivery.
 41 */
 42#define _UC_SETSTACK	0x00010000
 43#define _UC_CLRSTACK	0x00020000
 44
 45/*
 46 * General register state
 47 */
 48#define	_NGREG		18
 49typedef int		__greg_t;
 50typedef	__greg_t	__gregset_t[_NGREG];
 51
 52#define	_REG_D0	0
 53#define	_REG_D1	1
 54#define	_REG_D2	2
 55#define	_REG_D3	3
 56#define	_REG_D4	4
 57#define	_REG_D5	5
 58#define	_REG_D6	6
 59#define	_REG_D7	7
 60#define	_REG_A0	8
 61#define	_REG_A1	9
 62#define	_REG_A2	10
 63#define	_REG_A3	11
 64#define	_REG_A4	12
 65#define	_REG_A5	13
 66#define	_REG_A6	14
 67#define	_REG_A7	15
 68#define	_REG_PC	16
 69#define	_REG_PS	17
 70
 71typedef struct {
 72	int	__fp_pcr;
 73	int	__fp_psr;
 74	int	__fp_piaddr;
 75	int	__fp_fpregs[8*3];
 76} __fpregset_t;
 77
 78typedef struct {
 79	__gregset_t	__gregs;	/* General Register set */
 80	__fpregset_t	__fpregs;	/* Floating Point Register set */
 81	union {
 82		long	__mc_state[201];	/* Only need 308 bytes... */
 83#if defined(_KERNEL) || defined(__M68K_MCONTEXT_PRIVATE)
 84		struct {
 85			/* Rest of the frame. */
 86			unsigned int	__mcf_format;
 87			unsigned int	__mcf_vector;
 88			union F_u	__mcf_exframe;
 89			/* Rest of the FPU frame. */
 90			union FPF_u1	__mcf_fpf_u1;
 91			union FPF_u2	__mcf_fpf_u2;
 92		} __mc_frame;
 93#endif /* _KERNEL || __M68K_MCONTEXT_PRIVATE */
 94	}		__mc_pad;
 95	__greg_t	_mc_tlsbase;
 96} mcontext_t;
 97
 98/* Note: no additional padding is to be performed in ucontext_t. */
 99
100/* Machine-specific uc_flags value */
101#define _UC_M68K_UC_USER 0x40000000
102#define	_UC_TLSBASE	0x00080000
103
104#define _UC_MACHINE_SP(uc)	((uc)->uc_mcontext.__gregs[_REG_A7])
105#define _UC_MACHINE_FP(uc)	((uc)->uc_mcontext.__gregs[_REG_A6])
106#define _UC_MACHINE_PC(uc)	((uc)->uc_mcontext.__gregs[_REG_PC])
107#define _UC_MACHINE_INTRV(uc)	((uc)->uc_mcontext.__gregs[_REG_D0])
108
109#define	_UC_MACHINE_SET_PC(uc, pc)	_UC_MACHINE_PC(uc) = (pc)
110
111#define	__UCONTEXT_SIZE	1024
112
113#if defined(_LIBC_SOURCE) || defined(_RTLD_SOURCE) || defined(__LIBPTHREAD_SOURCE__)
114#define	TLS_TP_OFFSET	0x7000
115#define	TLS_DTV_OFFSET	0x8000
116
117#include <sys/tls.h>
118
119__CTASSERT(TLS_TP_OFFSET + sizeof(struct tls_tcb) < 0x8000);
120__CTASSERT(TLS_TP_OFFSET % sizeof(struct tls_tcb) == 0);
121
122__BEGIN_DECLS
123
124void *_lwp_getprivate(void);
125void _lwp_setprivate(void *);
126
127static __inline struct tls_tcb *
128__lwp_gettcb_fast(void)
129{
130	unsigned int __tcb = (unsigned int)_lwp_getprivate();
131	return (struct tls_tcb *)(uintptr_t)
132	    (__tcb - TLS_TP_OFFSET - sizeof(struct tls_tcb));
133}
134
135static inline void
136__lwp_settcb(struct tls_tcb *__tcb)
137{
138	__tcb += TLS_TP_OFFSET / sizeof(*__tcb) + 1;
139	_lwp_setprivate(__tcb);
140}
141__END_DECLS
142#endif
143
144#endif	/* !_M68K_MCONTEXT_H_ */