arch/openrisc/kernel/asm-offsets.c

   1 /*
   2  * OpenRISC asm-offsets.c
   3  *
   4  * Linux architectural port borrowing liberally from similar works of
   5  * others.  All original copyrights apply as per the original source
   6  * declaration.
   7  *
   8  * Modifications for the OpenRISC architecture:
   9  * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
  10  * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
  11  *
  12  *      This program is free software; you can redistribute it and/or
  13  *      modify it under the terms of the GNU General Public License
  14  *      as published by the Free Software Foundation; either version
  15  *      2 of the License, or (at your option) any later version.
  16  *
  17  * This program is used to generate definitions needed by
  18  * assembly language modules.
  19  *
  20  * We use the technique used in the OSF Mach kernel code:
  21  * generate asm statements containing #defines,
  22  * compile this file to assembler, and then extract the
  23  * #defines from the assembly-language output.
  24  */
  25
  26 #include <linux/signal.h>
  27 #include <linux/sched.h>
  28 #include <linux/kernel.h>
  29 #include <linux/errno.h>
  30 #include <linux/string.h>
  31 #include <linux/types.h>
  32 #include <linux/ptrace.h>
  33 #include <linux/mman.h>
  34 #include <linux/mm.h>
  35 #include <linux/io.h>
  36 #include <linux/thread_info.h>
  37 #include <asm/page.h>
  38 #include <asm/pgtable.h>
  39 #include <asm/processor.h>
  40
  41 #define DEFINE(sym, val) \
  42                 asm volatile("\n->" #sym " %0 " #val : : "i" (val))
  43
  44 #define BLANK() asm volatile("\n->" : : )
  45
  46 int main(void)
  47 {
  48         /* offsets into the task_struct */
  49         DEFINE(TASK_STATE, offsetof(struct task_struct, state));
  50         DEFINE(TASK_FLAGS, offsetof(struct task_struct, flags));
  51         DEFINE(TASK_PTRACE, offsetof(struct task_struct, ptrace));
  52         DEFINE(TASK_THREAD, offsetof(struct task_struct, thread));
  53         DEFINE(TASK_MM, offsetof(struct task_struct, mm));
  54         DEFINE(TASK_ACTIVE_MM, offsetof(struct task_struct, active_mm));
  55
  56         /* offsets into thread_info */
  57         DEFINE(TI_TASK, offsetof(struct thread_info, task));
  58         DEFINE(TI_FLAGS, offsetof(struct thread_info, flags));
  59         DEFINE(TI_PREEMPT, offsetof(struct thread_info, preempt_count));
  60         DEFINE(TI_KSP, offsetof(struct thread_info, ksp));
  61
  62         DEFINE(PT_SIZE, sizeof(struct pt_regs));
  63
  64         /* Interrupt register frame */
  65         DEFINE(STACK_FRAME_OVERHEAD, STACK_FRAME_OVERHEAD);
  66         DEFINE(INT_FRAME_SIZE, STACK_FRAME_OVERHEAD + sizeof(struct pt_regs));
  67
  68         DEFINE(NUM_USER_SEGMENTS, TASK_SIZE >> 28);
  69         return 0;
  70 }