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/processor.h>
  31 #include <asm/signal.h>
  32
  33 /* cpu depend functions */
  34 extern long h8300_get_reg(struct task_struct *task, int regno);
  35 extern int  h8300_put_reg(struct task_struct *task, int regno, unsigned long data);
  36
  37
  38 void user_disable_single_step(struct task_struct *child)
  39 {
  40 }
  41
  42 /*
  43  * does not yet catch signals sent when the child dies.
  44  * in exit.c or in signal.c.
  45  */
  46
  47 void ptrace_disable(struct task_struct *child)
  48 {
  49         user_disable_single_step(child);
  50 }
  51
  52 long arch_ptrace(struct task_struct *child, long request,
  53                  unsigned long addr, unsigned long data)
  54 {
  55         int ret;
  56         int regno = addr >> 2;
  57         unsigned long __user *datap = (unsigned long __user *) data;
  58
  59         switch (request) {
  60         /* read the word at location addr in the USER area. */
  61                 case PTRACE_PEEKUSR: {
  62                         unsigned long tmp = 0;
  63
  64                         if ((addr & 3) || addr >= sizeof(struct user)) {
  65                                 ret = -EIO;
  66                                 break ;
  67                         }
  68
  69                         ret = 0;  /* Default return condition */
  70
  71                         if (regno < H8300_REGS_NO)
  72                                 tmp = h8300_get_reg(child, regno);
  73                         else {
  74                                 switch (regno) {
  75                                 case 49:
  76                                         tmp = child->mm->start_code;
  77                                         break ;
  78                                 case 50:
  79                                         tmp = child->mm->start_data;
  80                                         break ;
  81                                 case 51:
  82                                         tmp = child->mm->end_code;
  83                                         break ;
  84                                 case 52:
  85                                         tmp = child->mm->end_data;
  86                                         break ;
  87                                 default:
  88                                         ret = -EIO;
  89                                 }
  90                         }
  91                         if (!ret)
  92                                 ret = put_user(tmp, datap);
  93                         break ;
  94                 }
  95
  96       /* when I and D space are separate, this will have to be fixed. */
  97                 case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
  98                         if ((addr & 3) || addr >= sizeof(struct user)) {
  99                                 ret = -EIO;
 100                                 break ;
 101                         }
 102
 103                         if (regno == PT_ORIG_ER0) {
 104                                 ret = -EIO;
 105                                 break ;
 106                         }
 107                         if (regno < H8300_REGS_NO) {
 108                                 ret = h8300_put_reg(child, regno, data);
 109                                 break ;
 110                         }
 111                         ret = -EIO;
 112                         break ;
 113
 114                 case PTRACE_GETREGS: { /* Get all gp regs from the child. */
 115                         int i;
 116                         unsigned long tmp;
 117                         for (i = 0; i < H8300_REGS_NO; i++) {
 118                             tmp = h8300_get_reg(child, i);
 119                             if (put_user(tmp, datap)) {
 120                                 ret = -EFAULT;
 121                                 break;
 122                             }
 123                             datap++;
 124                         }
 125                         ret = 0;
 126                         break;
 127                 }
 128
 129                 case PTRACE_SETREGS: { /* Set all gp regs in the child. */
 130                         int i;
 131                         unsigned long tmp;
 132                         for (i = 0; i < H8300_REGS_NO; i++) {
 133                             if (get_user(tmp, datap)) {
 134                                 ret = -EFAULT;
 135                                 break;
 136                             }
 137                             h8300_put_reg(child, i, tmp);
 138                             datap++;
 139                         }
 140                         ret = 0;
 141                         break;
 142                 }
 143
 144                 default:
 145                         ret = ptrace_request(child, request, addr, data);
 146                         break;
 147         }
 148         return ret;
 149 }
 150
 151 asmlinkage void do_syscall_trace(void)
 152 {
 153         if (!test_thread_flag(TIF_SYSCALL_TRACE))
 154                 return;
 155         if (!(current->ptrace & PT_PTRACED))
 156                 return;
 157         ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
 158                                  ? 0x80 : 0));
 159         /*
 160          * this isn't the same as continuing with a signal, but it will do
 161          * for normal use.  strace only continues with a signal if the
 162          * stopping signal is not SIGTRAP.  -brl
 163          */
 164         if (current->exit_code) {
 165                 send_sig(current->exit_code, current, 1);
 166                 current->exit_code = 0;
 167         }
 168 }