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  */
  32 struct 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 */