arch/arm26/kernel/asm-offsets.c

   1 /*
   2  * Copyright (C) 1995-2001 Russell King
   3  *               2001-2002 Keith Owens
   4  *               2003      Ian Molton
   5  *
   6  * Generate definitions needed by assembly language modules.
   7  * This code generates raw asm output which is post-processed to extract
   8  * and format the required data.
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  */
  14
  15 #include <linux/config.h>
  16 #include <linux/sched.h>
  17 #include <linux/mm.h>
  18
  19 #include <asm/pgtable.h>
  20 #include <asm/uaccess.h>
  21
  22 /*
  23  * Make sure that the compiler and target are compatible.
  24  */
  25 #if defined(__APCS_32__) && defined(CONFIG_CPU_26)
  26 #error Sorry, your compiler targets APCS-32 but this kernel requires APCS-26
  27 #endif
  28 #if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 95)
  29 #error Sorry, your compiler is known to miscompile kernels.  Only use gcc 2.95.3 and later.
  30 #endif
  31 #if __GNUC__ == 2 && __GNUC_MINOR__ == 95
  32 /* shame we can't detect the .1 or .2 releases */
  33 #warning GCC 2.95.2 and earlier miscompiles kernels.
  34 #endif
  35
  36 /* Use marker if you need to separate the values later */
  37
  38 #define DEFINE(sym, val) \
  39         asm volatile("\n->" #sym " %0 " #val : : "i" (val))
  40
  41 #define BLANK() asm volatile("\n->" : : )
  42
  43 int main(void)
  44 {
  45   DEFINE(TSK_ACTIVE_MM,         offsetof(struct task_struct, active_mm));
  46   BLANK();
  47   DEFINE(VMA_VM_MM,             offsetof(struct vm_area_struct, vm_mm));
  48   DEFINE(VMA_VM_FLAGS,          offsetof(struct vm_area_struct, vm_flags));
  49   BLANK();
  50   DEFINE(VM_EXEC,               VM_EXEC);
  51   BLANK();
  52   BLANK();
  53   DEFINE(PAGE_PRESENT,          _PAGE_PRESENT);
  54   DEFINE(PAGE_READONLY,         _PAGE_READONLY);
  55   DEFINE(PAGE_NOT_USER,         _PAGE_NOT_USER);
  56   DEFINE(PAGE_OLD,              _PAGE_OLD);
  57   DEFINE(PAGE_CLEAN,            _PAGE_CLEAN);
  58   BLANK();
  59   DEFINE(PAGE_SZ,               PAGE_SIZE);
  60   BLANK();
  61   DEFINE(SYS_ERROR0,            0x9f0000);
  62   return 0;
  63 }