1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License.  See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 1994, 1995, 1996, 1999 by Ralf Baechle
7 */
8#ifndef _ASM_USER_H
9#define _ASM_USER_H
10
11#include <linux/ptrace.h>
12
13#include <asm/page.h>
14#include <asm/reg.h>
15
16/*
17 * Core file format: The core file is written in such a way that gdb
18 * can understand it and provide useful information to the user (under
19 * linux we use the `trad-core' bfd, NOT the irix-core).  The file
20 * contents are as follows:
21 *
22 *  upage: 1 page consisting of a user struct that tells gdb
23 *	what is present in the file.  Directly after this is a
24 *	copy of the task_struct, which is currently not used by gdb,
25 *	but it may come in handy at some point.  All of the registers
26 *	are stored as part of the upage.  The upage should always be
27 *	only one page long.
28 *  data: The data segment follows next.  We use current->end_text to
29 *	current->brk to pick up all of the user variables, plus any memory
30 *	that may have been sbrk'ed.  No attempt is made to determine if a
31 *	page is demand-zero or if a page is totally unused, we just cover
32 *	the entire range.  All of the addresses are rounded in such a way
33 *	that an integral number of pages is written.
34 *  stack: We need the stack information in order to get a meaningful
35 *	backtrace.  We need to write the data from usp to
36 *	current->start_stack, so we round each of these in order to be able
37 *	to write an integer number of pages.
38 */
39struct user {
40	unsigned long	regs[EF_SIZE/8+64];	/* integer and fp regs */
41	size_t		u_tsize;		/* text size (pages) */
42	size_t		u_dsize;		/* data size (pages) */
43	size_t		u_ssize;		/* stack size (pages) */
44	unsigned long	start_code;		/* text starting address */
45	unsigned long	start_data;		/* data starting address */
46	unsigned long	start_stack;		/* stack starting address */
47	long int	signal;			/* signal causing core dump */
48	struct regs *	u_ar0;			/* help gdb find registers */
49	unsigned long	magic;			/* identifies a core file */
50	char		u_comm[32];		/* user command name */
51};
52
53#define NBPG			PAGE_SIZE
54#define UPAGES			1
55#define HOST_TEXT_START_ADDR	(u.start_code)
56#define HOST_DATA_START_ADDR	(u.start_data)
57#define HOST_STACK_END_ADDR	(u.start_stack + u.u_ssize * NBPG)
58
59#endif /* _ASM_USER_H */
60