arch/arm/kernel/asm-offsets.c

   1 /*
   2  * Copyright (C) 1995-2003 Russell King
   3  *               2001-2002 Keith Owens
   4  *
   5  * Generate definitions needed by assembly language modules.
   6  * This code generates raw asm output which is post-processed to extract
   7  * and format the required data.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13 #include <linux/sched.h>
  14 #include <linux/mm.h>
  15 #include <asm/mach/arch.h>
  16 #include <asm/thread_info.h>
  17
  18 /*
  19  * Make sure that the compiler and target are compatible.
  20  */
  21 #if defined(__APCS_26__)
  22 #error Sorry, your compiler targets APCS-26 but this kernel requires APCS-32
  23 #endif
  24 /*
  25  * GCC 2.95.1, 2.95.2: ignores register clobber list in asm().
  26  * GCC 3.0, 3.1: general bad code generation.
  27  * GCC 3.2.0: incorrect function argument offset calculation.
  28  * GCC 3.2.x: miscompiles NEW_AUX_ENT in fs/binfmt_elf.c
  29  *            (http://gcc.gnu.org/PR8896) and incorrect structure
  30  *            initialisation in fs/jffs2/erase.c
  31  */
  32 #if __GNUC__ < 2 || \
  33    (__GNUC__ == 2 && __GNUC_MINOR__ < 95) || \
  34    (__GNUC__ == 2 && __GNUC_MINOR__ == 95 && __GNUC_PATCHLEVEL__ != 0 && \
  35                                              __GNUC_PATCHLEVEL__ < 3) || \
  36    (__GNUC__ == 3 && __GNUC_MINOR__ < 3)
  37 #error Your compiler is too buggy; it is known to miscompile kernels.
  38 #error    Known good compilers: 2.95.3, 2.95.4, 2.96, 3.3
  39 #endif
  40
  41 /* Use marker if you need to separate the values later */
  42
  43 #define DEFINE(sym, val) \
  44         asm volatile("\n->" #sym " %0 " #val : : "i" (val))
  45
  46 #define BLANK() asm volatile("\n->" : : )
  47
  48 int main(void)
  49 {
  50   DEFINE(TSK_ACTIVE_MM,         offsetof(struct task_struct, active_mm));
  51   BLANK();
  52   DEFINE(TI_FLAGS,              offsetof(struct thread_info, flags));
  53   DEFINE(TI_PREEMPT,            offsetof(struct thread_info, preempt_count));
  54   DEFINE(TI_ADDR_LIMIT,         offsetof(struct thread_info, addr_limit));
  55   DEFINE(TI_TASK,               offsetof(struct thread_info, task));
  56   DEFINE(TI_EXEC_DOMAIN,        offsetof(struct thread_info, exec_domain));
  57   DEFINE(TI_CPU,                offsetof(struct thread_info, cpu));
  58   DEFINE(TI_CPU_DOMAIN,         offsetof(struct thread_info, cpu_domain));
  59   DEFINE(TI_CPU_SAVE,           offsetof(struct thread_info, cpu_context));
  60   DEFINE(TI_USED_CP,            offsetof(struct thread_info, used_cp));
  61   DEFINE(TI_FPSTATE,            offsetof(struct thread_info, fpstate));
  62   DEFINE(TI_VFPSTATE,           offsetof(struct thread_info, vfpstate));
  63   DEFINE(TI_IWMMXT_STATE,       (offsetof(struct thread_info, fpstate)+4)&~7);
  64   BLANK();
  65 #if __LINUX_ARM_ARCH__ >= 6
  66   DEFINE(MM_CONTEXT_ID,         offsetof(struct mm_struct, context.id));
  67   BLANK();
  68 #endif
  69   DEFINE(VMA_VM_MM,             offsetof(struct vm_area_struct, vm_mm));
  70   DEFINE(VMA_VM_FLAGS,          offsetof(struct vm_area_struct, vm_flags));
  71   BLANK();
  72   DEFINE(VM_EXEC,               VM_EXEC);
  73   BLANK();
  74   DEFINE(PAGE_SZ,               PAGE_SIZE);
  75   BLANK();
  76   DEFINE(SYS_ERROR0,            0x9f0000);
  77   BLANK();
  78   DEFINE(SIZEOF_MACHINE_DESC,   sizeof(struct machine_desc));
  79   return 0;
  80 }