arch/sh/include/asm/user.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __ASM_SH_USER_H
   3 #define __ASM_SH_USER_H
   4
   5 #include <asm/ptrace.h>
   6 #include <asm/page.h>
   7
   8 /*
   9  * Core file format: The core file is written in such a way that gdb
  10  * can understand it and provide useful information to the user (under
  11  * linux we use the `trad-core' bfd).  The file contents are as follows:
  12  *
  13  *  upage: 1 page consisting of a user struct that tells gdb
  14  *      what is present in the file.  Directly after this is a
  15  *      copy of the task_struct, which is currently not used by gdb,
  16  *      but it may come in handy at some point.  All of the registers
  17  *      are stored as part of the upage.  The upage should always be
  18  *      only one page long.
  19  *  data: The data segment follows next.  We use current->end_text to
  20  *      current->brk to pick up all of the user variables, plus any memory
  21  *      that may have been sbrk'ed.  No attempt is made to determine if a
  22  *      page is demand-zero or if a page is totally unused, we just cover
  23  *      the entire range.  All of the addresses are rounded in such a way
  24  *      that an integral number of pages is written.
  25  *  stack: We need the stack information in order to get a meaningful
  26  *      backtrace.  We need to write the data from usp to
  27  *      current->start_stack, so we round each of these in order to be able
  28  *      to write an integer number of pages.
  29  */
  30
  31 struct user_fpu_struct {
  32         unsigned long fp_regs[16];
  33         unsigned long xfp_regs[16];
  34         unsigned long fpscr;
  35         unsigned long fpul;
  36 };
  37
  38 struct user {
  39         struct pt_regs  regs;                   /* entire machine state */
  40         struct user_fpu_struct fpu;     /* Math Co-processor registers  */
  41         int u_fpvalid;          /* True if math co-processor being used */
  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         unsigned long   u_ar0;                  /* help gdb find registers */
  50         struct user_fpu_struct* u_fpstate;      /* Math Co-processor pointer */
  51         unsigned long   magic;                  /* identifies a core file */
  52         char            u_comm[32];             /* user command name */
  53 };
  54
  55 #define NBPG                    PAGE_SIZE
  56 #define UPAGES                  1
  57 #define HOST_TEXT_START_ADDR    (u.start_code)
  58 #define HOST_DATA_START_ADDR    (u.start_data)
  59 #define HOST_STACK_END_ADDR     (u.start_stack + u.u_ssize * NBPG)
  60
  61 #endif /* __ASM_SH_USER_H */