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arthur.c

/*
 *  linux/arch/arm/kernel/arthur.c
 *
 *  Copyright (C) 1998, 1999, 2000, 2001 Philip Blundell
 *
 * Arthur personality
 */

/*
 * 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.
 */

#include <linux/module.h>
#include <linux/personality.h>
#include <linux/stddef.h>
#include <linux/signal.h>
#include <linux/init.h>
#include <linux/sched.h>

#include <asm/ptrace.h>

/* Arthur doesn't have many signals, and a lot of those that it does
   have don't map easily to any Linux equivalent.  Never mind.  */

#define ARTHUR_SIGABRT        1
#define ARTHUR_SIGFPE         2
#define ARTHUR_SIGILL         3
#define ARTHUR_SIGINT         4
#define ARTHUR_SIGSEGV        5
#define ARTHUR_SIGTERM        6
#define ARTHUR_SIGSTAK        7
#define ARTHUR_SIGUSR1        8
#define ARTHUR_SIGUSR2        9
#define ARTHUR_SIGOSERROR     10

static unsigned long arthur_to_linux_signals[32] = {
      0,    1,    2,    3,    4,    5,    6,    7,
      8,    9,    10,   11,   12,   13,   14,   15,
      16,   17,   18,   19,   20,   21,   22,   23,
      24,   25,   26,   27,   28,   29,   30,   31
};

static unsigned long linux_to_arthur_signals[32] = {
      0,          -1,         ARTHUR_SIGINT,    -1,
            ARTHUR_SIGILL,    5,          ARTHUR_SIGABRT,   7,
      ARTHUR_SIGFPE,    9,          ARTHUR_SIGUSR1,   ARTHUR_SIGSEGV,   
      ARTHUR_SIGUSR2,   13,         14,         ARTHUR_SIGTERM,
      16,         17,         18,         19,
      20,         21,         22,         23,
      24,         25,         26,         27,
      28,         29,         30,         31
};

static void arthur_lcall7(int nr, struct pt_regs *regs)
{
      struct siginfo info;
      info.si_signo = SIGSWI;
      info.si_errno = nr;
      /* Bounce it to the emulator */
      send_sig_info(SIGSWI, &info, current);
}

static struct exec_domain arthur_exec_domain = {
      .name       = "Arthur",
      .handler    = arthur_lcall7,
      .pers_low   = PER_RISCOS,
      .pers_high  = PER_RISCOS,
      .signal_map = arthur_to_linux_signals,
      .signal_invmap    = linux_to_arthur_signals,
      .module           = THIS_MODULE,
};

/*
 * We could do with some locking to stop Arthur being removed while
 * processes are using it.
 */

static int __init arthur_init(void)
{
      return register_exec_domain(&arthur_exec_domain);
}

static void __exit arthur_exit(void)
{
      unregister_exec_domain(&arthur_exec_domain);
}

module_init(arthur_init);
module_exit(arthur_exit);

MODULE_LICENSE("GPL");

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