target/linux/ubicom32/files/arch/ubicom32/include/asm/user.h

   1 /*
   2  * arch/ubicom32/include/asm/user.h
   3  *   Ubicom32 architecture core file definitions.
   4  *
   5  * (C) Copyright 2009, Ubicom, Inc.
   6  *
   7  * This file is part of the Ubicom32 Linux Kernel Port.
   8  *
   9  * The Ubicom32 Linux Kernel Port is free software: you can redistribute
  10  * it and/or modify it under the terms of the GNU General Public License
  11  * as published by the Free Software Foundation, either version 2 of the
  12  * License, or (at your option) any later version.
  13  *
  14  * The Ubicom32 Linux Kernel Port is distributed in the hope that it
  15  * will be useful, but WITHOUT ANY WARRANTY; without even the implied
  16  * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  17  * the GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with the Ubicom32 Linux Kernel Port.  If not,
  21  * see <http://www.gnu.org/licenses/>.
  22  *
  23  * Ubicom32 implementation derived from (with many thanks):
  24  *   arch/m68knommu
  25  *   arch/blackfin
  26  *   arch/parisc
  27  */
  28 #ifndef _ASM_UBICOM32_USER_H
  29 #define _ASM_UBICOM32_USER_H
  30
  31 #include <asm/ptrace.h>
  32 #include <asm/page.h>
  33 /*
  34  * Adapted from <asm-powerpc/user.h>
  35  *
  36  * Core file format: The core file is written in such a way that gdb
  37  * can understand it and provide useful information to the user (under
  38  * linux we use the `trad-core' bfd, NOT the osf-core).  The file contents
  39  * are as follows:
  40  *
  41  *  upage: 1 page consisting of a user struct that tells gdb
  42  *      what is present in the file.  Directly after this is a
  43  *      copy of the task_struct, which is currently not used by gdb,
  44  *      but it may come in handy at some point.  All of the registers
  45  *      are stored as part of the upage.  The upage should always be
  46  *      only one page long.
  47  *  data: The data segment follows next.  We use current->end_text to
  48  *      current->brk to pick up all of the user variables, plus any memory
  49  *      that may have been sbrk'ed.  No attempt is made to determine if a
  50  *      page is demand-zero or if a page is totally unused, we just cover
  51  *      the entire range.  All of the addresses are rounded in such a way
  52  *      that an integral number of pages is written.
  53  *  stack: We need the stack information in order to get a meaningful
  54  *      backtrace.  We need to write the data from usp to
  55  *      current->start_stack, so we round each of these in order to be able
  56  *      to write an integer number of pages.
  57  */
  58
  59 struct user_ubicom32fp_struct {
  60 };
  61
  62 struct user {
  63         struct pt_regs  regs;                   /* entire machine state */
  64         size_t          u_tsize;                /* text size (pages) */
  65         size_t          u_dsize;                /* data size (pages) */
  66         size_t          u_ssize;                /* stack size (pages) */
  67         unsigned long   start_code;             /* text starting address */
  68         unsigned long   start_data;             /* data starting address */
  69         unsigned long   start_stack;            /* stack starting address */
  70         long int        signal;                 /* signal causing core dump */
  71         unsigned long   u_ar0;                  /* help gdb find registers */
  72         unsigned long   magic;                  /* identifies a core file */
  73         char            u_comm[32];             /* user command name */
  74 };
  75
  76 #define NBPG                    PAGE_SIZE
  77 #define UPAGES                  1
  78 #define HOST_TEXT_START_ADDR    (u.start_code)
  79 #define HOST_DATA_START_ADDR    (u.start_data)
  80 #define HOST_STACK_END_ADDR     (u.start_stack + u.u_ssize * NBPG)
  81
  82 #endif  /* _ASM_UBICOM32_USER_H */