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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 <asm/page.h>
12#include <asm/reg.h>
13
14/*
15 * Core file format: The core file is written in such a way that gdb
16 * can understand it and provide useful information to the user (under
17 * linux we use the `trad-core' bfd, NOT the irix-core). The file
18 * contents are as follows:
19 *
20 * upage: 1 page consisting of a user struct that tells gdb
21 * what is present in the file. Directly after this is a
22 * copy of the task_struct, which is currently not used by gdb,
23 * but it may come in handy at some point. All of the registers
24 * are stored as part of the upage. The upage should always be
25 * only one page long.
26 * data: The data segment follows next. We use current->end_text to
27 * current->brk to pick up all of the user variables, plus any memory
28 * that may have been sbrk'ed. No attempt is made to determine if a
29 * page is demand-zero or if a page is totally unused, we just cover
30 * the entire range. All of the addresses are rounded in such a way
31 * that an integral number of pages is written.
32 * stack: We need the stack information in order to get a meaningful
33 * backtrace. We need to write the data from usp to
34 * current->start_stack, so we round each of these in order to be able
35 * to write an integer number of pages.
36 */
37struct user {
38 unsigned long regs[EF_SIZE / /* integer and fp regs */
39 sizeof(unsigned long) + 64];
40 size_t u_tsize; /* text size (pages) */
41 size_t u_dsize; /* data size (pages) */
42 size_t u_ssize; /* stack size (pages) */
43 unsigned long start_code; /* text starting address */
44 unsigned long start_data; /* data starting address */
45 unsigned long start_stack; /* stack starting address */
46 long int signal; /* signal causing core dump */
47 struct regs * u_ar0; /* help gdb find registers */
48 unsigned long magic; /* identifies a core file */
49 char u_comm[32]; /* user command name */
50};
51
52#define NBPG PAGE_SIZE
53#define UPAGES 1
54#define HOST_TEXT_START_ADDR (u.start_code)
55#define HOST_DATA_START_ADDR (u.start_data)
56#define HOST_STACK_END_ADDR (u.start_stack + u.u_ssize * NBPG)
57
58#endif /* _ASM_USER_H */