include/asm-mips/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 #ifdef __KERNEL__
  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  */
  39 struct user {
  40         unsigned long   regs[EF_SIZE /          /* integer and fp regs */
  41                         sizeof(unsigned long) + 64];
  42         size_t          u_tsize;                /* text size (pages) */
  43         size_t          u_dsize;                /* data size (pages) */
  44         size_t          u_ssize;                /* stack size (pages) */
  45         unsigned long   start_code;             /* text starting address */
  46         unsigned long   start_data;             /* data starting address */
  47         unsigned long   start_stack;            /* stack starting address */
  48         long int        signal;                 /* signal causing core dump */
  49         struct regs *   u_ar0;                  /* help gdb find registers */
  50         unsigned long   magic;                  /* identifies a core file */
  51         char            u_comm[32];             /* user command name */
  52 };
  53
  54 #define NBPG                    PAGE_SIZE
  55 #define UPAGES                  1
  56 #define HOST_TEXT_START_ADDR    (u.start_code)
  57 #define HOST_DATA_START_ADDR    (u.start_data)
  58 #define HOST_STACK_END_ADDR     (u.start_stack + u.u_ssize * NBPG)
  59
  60 #endif /* __KERNEL__ */
  61
  62 #endif /* _ASM_USER_H */