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

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