arch/h8300/kernel/ptrace.c

   1 /*
   2  *  linux/arch/h8300/kernel/ptrace.c
   3  *
   4  *  Yoshinori Sato <ysato@users.sourceforge.jp>
   5  *
   6  *  Based on:
   7  *  linux/arch/m68k/kernel/ptrace.c
   8  *
   9  *  Copyright (C) 1994 by Hamish Macdonald
  10  *  Taken from linux/kernel/ptrace.c and modified for M680x0.
  11  *  linux/kernel/ptrace.c is by Ross Biro 1/23/92, edited by Linus Torvalds
  12  *
  13  * This file is subject to the terms and conditions of the GNU General
  14  * Public License.  See the file COPYING in the main directory of
  15  * this archive for more details.
  16  */
  17
  18 #include <linux/kernel.h>
  19 #include <linux/sched.h>
  20 #include <linux/mm.h>
  21 #include <linux/smp.h>
  22 #include <linux/errno.h>
  23 #include <linux/ptrace.h>
  24 #include <linux/user.h>
  25 #include <linux/signal.h>
  26
  27 #include <asm/uaccess.h>
  28 #include <asm/page.h>
  29 #include <asm/pgtable.h>
  30 #include <asm/system.h>
  31 #include <asm/processor.h>
  32 #include <asm/signal.h>
  33
  34 /* cpu depend functions */
  35 extern long h8300_get_reg(struct task_struct *task, int regno);
  36 extern int  h8300_put_reg(struct task_struct *task, int regno, unsigned long data);
  37
  38
  39 void user_disable_single_step(struct task_struct *child)
  40 {
  41 }
  42
  43 /*
  44  * does not yet catch signals sent when the child dies.
  45  * in exit.c or in signal.c.
  46  */
  47
  48 void ptrace_disable(struct task_struct *child)
  49 {
  50         user_disable_single_step(child);
  51 }
  52
  53 long arch_ptrace(struct task_struct *child, long request,
  54                  unsigned long addr, unsigned long data)
  55 {
  56         int ret;
  57         int regno = addr >> 2;
  58         unsigned long __user *datap = (unsigned long __user *) data;
  59
  60         switch (request) {
  61         /* read the word at location addr in the USER area. */
  62                 case PTRACE_PEEKUSR: {
  63                         unsigned long tmp = 0;
  64
  65                         if ((addr & 3) || addr >= sizeof(struct user)) {
  66                                 ret = -EIO;
  67                                 break ;
  68                         }
  69
  70                         ret = 0;  /* Default return condition */
  71
  72                         if (regno < H8300_REGS_NO)
  73                                 tmp = h8300_get_reg(child, regno);
  74                         else {
  75                                 switch (regno) {
  76                                 case 49:
  77                                         tmp = child->mm->start_code;
  78                                         break ;
  79                                 case 50:
  80                                         tmp = child->mm->start_data;
  81                                         break ;
  82                                 case 51:
  83                                         tmp = child->mm->end_code;
  84                                         break ;
  85                                 case 52:
  86                                         tmp = child->mm->end_data;
  87                                         break ;
  88                                 default:
  89                                         ret = -EIO;
  90                                 }
  91                         }
  92                         if (!ret)
  93                                 ret = put_user(tmp, datap);
  94                         break ;
  95                 }
  96
  97       /* when I and D space are separate, this will have to be fixed. */
  98                 case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
  99                         if ((addr & 3) || addr >= sizeof(struct user)) {
 100                                 ret = -EIO;
 101                                 break ;
 102                         }
 103
 104                         if (regno == PT_ORIG_ER0) {
 105                                 ret = -EIO;
 106                                 break ;
 107                         }
 108                         if (regno < H8300_REGS_NO) {
 109                                 ret = h8300_put_reg(child, regno, data);
 110                                 break ;
 111                         }
 112                         ret = -EIO;
 113                         break ;
 114
 115                 case PTRACE_GETREGS: { /* Get all gp regs from the child. */
 116                         int i;
 117                         unsigned long tmp;
 118                         for (i = 0; i < H8300_REGS_NO; i++) {
 119                             tmp = h8300_get_reg(child, i);
 120                             if (put_user(tmp, datap)) {
 121                                 ret = -EFAULT;
 122                                 break;
 123                             }
 124                             datap++;
 125                         }
 126                         ret = 0;
 127                         break;
 128                 }
 129
 130                 case PTRACE_SETREGS: { /* Set all gp regs in the child. */
 131                         int i;
 132                         unsigned long tmp;
 133                         for (i = 0; i < H8300_REGS_NO; i++) {
 134                             if (get_user(tmp, datap)) {
 135                                 ret = -EFAULT;
 136                                 break;
 137                             }
 138                             h8300_put_reg(child, i, tmp);
 139                             datap++;
 140                         }
 141                         ret = 0;
 142                         break;
 143                 }
 144
 145                 default:
 146                         ret = ptrace_request(child, request, addr, data);
 147                         break;
 148         }
 149         return ret;
 150 }
 151
 152 asmlinkage void do_syscall_trace(void)
 153 {
 154         if (!test_thread_flag(TIF_SYSCALL_TRACE))
 155                 return;
 156         if (!(current->ptrace & PT_PTRACED))
 157                 return;
 158         ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
 159                                  ? 0x80 : 0));
 160         /*
 161          * this isn't the same as continuing with a signal, but it will do
 162          * for normal use.  strace only continues with a signal if the
 163          * stopping signal is not SIGTRAP.  -brl
 164          */
 165         if (current->exit_code) {
 166                 send_sig(current->exit_code, current, 1);
 167                 current->exit_code = 0;
 168         }
 169 }