asm-offsets.c

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/*
 * OpenRISC asm-offsets.c
 *
 * Linux architectural port borrowing liberally from similar works of
 * others.  All original copyrights apply as per the original source
 * declaration.
 *
 * Modifications for the OpenRISC architecture:
 * Copyright (C) 2003 Matjaz Breskvar <[email protected]>
 * Copyright (C) 2010-2011 Jonas Bonn <[email protected]>
 *
 *      This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      as published by the Free Software Foundation; either version
 *      2 of the License, or (at your option) any later version.
 *
 * This program is used to generate definitions needed by
 * assembly language modules.
 *
 * We use the technique used in the OSF Mach kernel code:
 * generate asm statements containing #defines,
 * compile this file to assembler, and then extract the
 * #defines from the assembly-language output.
 */

#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/ptrace.h>
#include <linux/mman.h>
#include <linux/mm.h>
#include <linux/io.h>
#include <linux/thread_info.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/processor.h>

#define DEFINE(sym, val) \
        asm volatile("\n->" #sym " %0 " #val : : "i" (val))

#define BLANK() asm volatile("\n->" : : )

int main(void)
{
    /* offsets into the task_struct */
    DEFINE(TASK_STATE, offsetof(struct task_struct, state));
    DEFINE(TASK_FLAGS, offsetof(struct task_struct, flags));
    DEFINE(TASK_PTRACE, offsetof(struct task_struct, ptrace));
    DEFINE(TASK_THREAD, offsetof(struct task_struct, thread));
    DEFINE(TASK_MM, offsetof(struct task_struct, mm));
    DEFINE(TASK_ACTIVE_MM, offsetof(struct task_struct, active_mm));

    /* offsets into thread_info */
    DEFINE(TI_TASK, offsetof(struct thread_info, task));
    DEFINE(TI_FLAGS, offsetof(struct thread_info, flags));
    DEFINE(TI_PREEMPT, offsetof(struct thread_info, preempt_count));
    DEFINE(TI_KSP, offsetof(struct thread_info, ksp));

    DEFINE(PT_SIZE, sizeof(struct pt_regs));

    /* Interrupt register frame */
    DEFINE(STACK_FRAME_OVERHEAD, STACK_FRAME_OVERHEAD);
    DEFINE(INT_FRAME_SIZE, STACK_FRAME_OVERHEAD + sizeof(struct pt_regs));

    DEFINE(NUM_USER_SEGMENTS, TASK_SIZE >> 28);
    return 0;
}