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ptrace.c

/*
 *  linux/arch/h8300/kernel/ptrace.c
 *
 *  Yoshinori Sato <ysato@users.sourceforge.jp>
 *
 *  Based on:
 *  linux/arch/m68k/kernel/ptrace.c
 *
 *  Copyright (C) 1994 by Hamish Macdonald
 *  Taken from linux/kernel/ptrace.c and modified for M680x0.
 *  linux/kernel/ptrace.c is by Ross Biro 1/23/92, edited by Linus Torvalds
 *
 * This file is subject to the terms and conditions of the GNU General
 * Public License.  See the file COPYING in the main directory of
 * this archive for more details.
 */

#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/errno.h>
#include <linux/ptrace.h>
#include <linux/user.h>
#include <linux/signal.h>

#include <asm/uaccess.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/system.h>
#include <asm/processor.h>
#include <asm/signal.h>

/* cpu depend functions */
extern long h8300_get_reg(struct task_struct *task, int regno);
extern int  h8300_put_reg(struct task_struct *task, int regno, unsigned long data);


void user_disable_single_step(struct task_struct *child)
{
}

/*
 * does not yet catch signals sent when the child dies.
 * in exit.c or in signal.c.
 */

void ptrace_disable(struct task_struct *child)
{
      user_disable_single_step(child);
}

long arch_ptrace(struct task_struct *child, long request,
             unsigned long addr, unsigned long data)
{
      int ret;
      int regno = addr >> 2;
      unsigned long __user *datap = (unsigned long __user *) data;

      switch (request) {
      /* read the word at location addr in the USER area. */
            case PTRACE_PEEKUSR: {
                  unsigned long tmp = 0;
                  
                  if ((addr & 3) || addr >= sizeof(struct user)) {
                        ret = -EIO;
                        break ;
                  }
                  
                    ret = 0;  /* Default return condition */

                  if (regno < H8300_REGS_NO)
                        tmp = h8300_get_reg(child, regno);
                  else {
                        switch (regno) {
                        case 49:
                              tmp = child->mm->start_code;
                              break ;
                        case 50:
                              tmp = child->mm->start_data;
                              break ;
                        case 51:
                              tmp = child->mm->end_code;
                              break ;
                        case 52:
                              tmp = child->mm->end_data;
                              break ;
                        default:
                              ret = -EIO;
                        }
                  }
                  if (!ret)
                        ret = put_user(tmp, datap);
                  break ;
            }

      /* when I and D space are separate, this will have to be fixed. */
            case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
                  if ((addr & 3) || addr >= sizeof(struct user)) {
                        ret = -EIO;
                        break ;
                  }
                      
                  if (regno == PT_ORIG_ER0) {
                        ret = -EIO;
                        break ;
                  }
                  if (regno < H8300_REGS_NO) {
                        ret = h8300_put_reg(child, regno, data);
                        break ;
                  }
                  ret = -EIO;
                  break ;

            case PTRACE_GETREGS: { /* Get all gp regs from the child. */
                  int i;
                  unsigned long tmp;
                  for (i = 0; i < H8300_REGS_NO; i++) {
                      tmp = h8300_get_reg(child, i);
                      if (put_user(tmp, datap)) {
                        ret = -EFAULT;
                        break;
                      }
                      datap++;
                  }
                  ret = 0;
                  break;
            }

            case PTRACE_SETREGS: { /* Set all gp regs in the child. */
                  int i;
                  unsigned long tmp;
                  for (i = 0; i < H8300_REGS_NO; i++) {
                      if (get_user(tmp, datap)) {
                        ret = -EFAULT;
                        break;
                      }
                      h8300_put_reg(child, i, tmp);
                      datap++;
                  }
                  ret = 0;
                  break;
            }

            default:
                  ret = ptrace_request(child, request, addr, data);
                  break;
      }
      return ret;
}

asmlinkage void do_syscall_trace(void)
{
      if (!test_thread_flag(TIF_SYSCALL_TRACE))
            return;
      if (!(current->ptrace & PT_PTRACED))
            return;
      ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
                         ? 0x80 : 0));
      /*
       * this isn't the same as continuing with a signal, but it will do
       * for normal use.  strace only continues with a signal if the
       * stopping signal is not SIGTRAP.  -brl
       */
      if (current->exit_code) {
            send_sig(current->exit_code, current, 1);
            current->exit_code = 0;
      }
}

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