LXR linux/arch/mips/include/asm/user.h

   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 <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        unsigned long   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 */
  59