zig

fork of https://codeberg.org/ziglang/zig
Log | Files | Refs | README | LICENSE

frame.h (3867B) - Raw

      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  */
     51 struct 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__
     87 struct 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
    100 struct 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_ */