arch/arm/kernel/arthur.c

   1 /*
   2  *  linux/arch/arm/kernel/arthur.c
   3  *
   4  *  Copyright (C) 1998, 1999, 2000, 2001 Philip Blundell
   5  *
   6  * Arthur personality
   7  */
   8
   9 /*
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public License
  12  * as published by the Free Software Foundation; either version
  13  * 2 of the License, or (at your option) any later version.
  14  */
  15
  16 #include <linux/module.h>
  17 #include <linux/personality.h>
  18 #include <linux/stddef.h>
  19 #include <linux/signal.h>
  20 #include <linux/init.h>
  21 #include <linux/sched.h>
  22
  23 #include <asm/ptrace.h>
  24
  25 /* Arthur doesn't have many signals, and a lot of those that it does
  26    have don't map easily to any Linux equivalent.  Never mind.  */
  27
  28 #define ARTHUR_SIGABRT          1
  29 #define ARTHUR_SIGFPE           2
  30 #define ARTHUR_SIGILL           3
  31 #define ARTHUR_SIGINT           4
  32 #define ARTHUR_SIGSEGV          5
  33 #define ARTHUR_SIGTERM          6
  34 #define ARTHUR_SIGSTAK          7
  35 #define ARTHUR_SIGUSR1          8
  36 #define ARTHUR_SIGUSR2          9
  37 #define ARTHUR_SIGOSERROR       10
  38
  39 static unsigned long arthur_to_linux_signals[32] = {
  40         0,      1,      2,      3,      4,      5,      6,      7,
  41         8,      9,      10,     11,     12,     13,     14,     15,
  42         16,     17,     18,     19,     20,     21,     22,     23,
  43         24,     25,     26,     27,     28,     29,     30,     31
  44 };
  45
  46 static unsigned long linux_to_arthur_signals[32] = {
  47         0,              -1,             ARTHUR_SIGINT,  -1,
  48         ARTHUR_SIGILL,  5,              ARTHUR_SIGABRT, 7,
  49         ARTHUR_SIGFPE,  9,              ARTHUR_SIGUSR1, ARTHUR_SIGSEGV,
  50         ARTHUR_SIGUSR2, 13,             14,             ARTHUR_SIGTERM,
  51         16,             17,             18,             19,
  52         20,             21,             22,             23,
  53         24,             25,             26,             27,
  54         28,             29,             30,             31
  55 };
  56
  57 static void arthur_lcall7(int nr, struct pt_regs *regs)
  58 {
  59         struct siginfo info;
  60         info.si_signo = SIGSWI;
  61         info.si_errno = nr;
  62         /* Bounce it to the emulator */
  63         send_sig_info(SIGSWI, &info, current);
  64 }
  65
  66 static struct exec_domain arthur_exec_domain = {
  67         .name           = "Arthur",
  68         .handler        = arthur_lcall7,
  69         .pers_low       = PER_RISCOS,
  70         .pers_high      = PER_RISCOS,
  71         .signal_map     = arthur_to_linux_signals,
  72         .signal_invmap  = linux_to_arthur_signals,
  73         .module         = THIS_MODULE,
  74 };
  75
  76 /*
  77  * We could do with some locking to stop Arthur being removed while
  78  * processes are using it.
  79  */
  80
  81 static int __init arthur_init(void)
  82 {
  83         return register_exec_domain(&arthur_exec_domain);
  84 }
  85
  86 static void __exit arthur_exit(void)
  87 {
  88         unregister_exec_domain(&arthur_exec_domain);
  89 }
  90
  91 module_init(arthur_init);
  92 module_exit(arthur_exit);