SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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 extern void h8300_disable_trace(struct task_struct *child);
  38 extern void h8300_enable_trace(struct task_struct *child);
  39
  40 /*
  41  * does not yet catch signals sent when the child dies.
  42  * in exit.c or in signal.c.
  43  */
  44
  45 void ptrace_disable(struct task_struct *child)
  46 {
  47         h8300_disable_trace(child);
  48 }
  49
  50 long arch_ptrace(struct task_struct *child, long request, long addr, long data)
  51 {
  52         int ret;
  53
  54         switch (request) {
  55         /* read the word at location addr in the USER area. */
  56                 case PTRACE_PEEKUSR: {
  57                         unsigned long tmp = 0;
  58
  59                         if ((addr & 3) || addr < 0 || addr >= sizeof(struct user)) {
  60                                 ret = -EIO;
  61                                 break ;
  62                         }
  63
  64                         ret = 0;  /* Default return condition */
  65                         addr = addr >> 2; /* temporary hack. */
  66
  67                         if (addr < H8300_REGS_NO)
  68                                 tmp = h8300_get_reg(child, addr);
  69                         else {
  70                                 switch(addr) {
  71                                 case 49:
  72                                         tmp = child->mm->start_code;
  73                                         break ;
  74                                 case 50:
  75                                         tmp = child->mm->start_data;
  76                                         break ;
  77                                 case 51:
  78                                         tmp = child->mm->end_code;
  79                                         break ;
  80                                 case 52:
  81                                         tmp = child->mm->end_data;
  82                                         break ;
  83                                 default:
  84                                         ret = -EIO;
  85                                 }
  86                         }
  87                         if (!ret)
  88                                 ret = put_user(tmp,(unsigned long *) data);
  89                         break ;
  90                 }
  91
  92       /* when I and D space are separate, this will have to be fixed. */
  93                 case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
  94                         if ((addr & 3) || addr < 0 || addr >= sizeof(struct user)) {
  95                                 ret = -EIO;
  96                                 break ;
  97                         }
  98                         addr = addr >> 2; /* temporary hack. */
  99
 100                         if (addr == PT_ORIG_ER0) {
 101                                 ret = -EIO;
 102                                 break ;
 103                         }
 104                         if (addr < H8300_REGS_NO) {
 105                                 ret = h8300_put_reg(child, addr, data);
 106                                 break ;
 107                         }
 108                         ret = -EIO;
 109                         break ;
 110                 case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
 111                 case PTRACE_CONT: { /* restart after signal. */
 112                         ret = -EIO;
 113                         if (!valid_signal(data))
 114                                 break ;
 115                         if (request == PTRACE_SYSCALL)
 116                                 set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
 117                         else
 118                                 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
 119                         child->exit_code = data;
 120                         wake_up_process(child);
 121                         /* make sure the single step bit is not set. */
 122                         h8300_disable_trace(child);
 123                         ret = 0;
 124                 }
 125
 126 /*
 127  * make the child exit.  Best I can do is send it a sigkill.
 128  * perhaps it should be put in the status that it wants to
 129  * exit.
 130  */
 131                 case PTRACE_KILL: {
 132
 133                         ret = 0;
 134                         if (child->exit_state == EXIT_ZOMBIE) /* already dead */
 135                                 break;
 136                         child->exit_code = SIGKILL;
 137                         h8300_disable_trace(child);
 138                         wake_up_process(child);
 139                         break;
 140                 }
 141
 142                 case PTRACE_SINGLESTEP: {  /* set the trap flag. */
 143                         ret = -EIO;
 144                         if (!valid_signal(data))
 145                                 break;
 146                         clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
 147                         child->exit_code = data;
 148                         h8300_enable_trace(child);
 149                         wake_up_process(child);
 150                         ret = 0;
 151                         break;
 152                 }
 153
 154                 case PTRACE_GETREGS: { /* Get all gp regs from the child. */
 155                         int i;
 156                         unsigned long tmp;
 157                         for (i = 0; i < H8300_REGS_NO; i++) {
 158                             tmp = h8300_get_reg(child, i);
 159                             if (put_user(tmp, (unsigned long *) data)) {
 160                                 ret = -EFAULT;
 161                                 break;
 162                             }
 163                             data += sizeof(long);
 164                         }
 165                         ret = 0;
 166                         break;
 167                 }
 168
 169                 case PTRACE_SETREGS: { /* Set all gp regs in the child. */
 170                         int i;
 171                         unsigned long tmp;
 172                         for (i = 0; i < H8300_REGS_NO; i++) {
 173                             if (get_user(tmp, (unsigned long *) data)) {
 174                                 ret = -EFAULT;
 175                                 break;
 176                             }
 177                             h8300_put_reg(child, i, tmp);
 178                             data += sizeof(long);
 179                         }
 180                         ret = 0;
 181                         break;
 182                 }
 183
 184                 default:
 185                         ret = ptrace_request(child, request, addr, data);
 186                         break;
 187         }
 188         return ret;
 189 }
 190
 191 asmlinkage void do_syscall_trace(void)
 192 {
 193         if (!test_thread_flag(TIF_SYSCALL_TRACE))
 194                 return;
 195         if (!(current->ptrace & PT_PTRACED))
 196                 return;
 197         ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
 198                                  ? 0x80 : 0));
 199         /*
 200          * this isn't the same as continuing with a signal, but it will do
 201          * for normal use.  strace only continues with a signal if the
 202          * stopping signal is not SIGTRAP.  -brl
 203          */
 204         if (current->exit_code) {
 205                 send_sig(current->exit_code, current, 1);
 206                 current->exit_code = 0;
 207         }
 208 }