Logo Search packages:      
Sourcecode: linux version File versions

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);
extern void h8300_disable_trace(struct task_struct *child);
extern void h8300_enable_trace(struct task_struct *child);

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

inline
static int read_long(struct task_struct * tsk, unsigned long addr,
      unsigned long * result)
{
      *result = *(unsigned long *)addr;
      return 0;
}

void ptrace_disable(struct task_struct *child)
{
      h8300_disable_trace(child);
}

long arch_ptrace(struct task_struct *child, long request, long addr, long data)
{
      int ret;

      switch (request) {
            case PTRACE_PEEKTEXT: /* read word at location addr. */ 
            case PTRACE_PEEKDATA: {
                  unsigned long tmp;

                  ret = read_long(child, addr, &tmp);
                  if (ret < 0)
                        break ;
                  ret = put_user(tmp, (unsigned long *) data);
                  break ;
            }

      /* read the word at location addr in the USER area. */
            case PTRACE_PEEKUSR: {
                  unsigned long tmp = 0;
                  
                  if ((addr & 3) || addr < 0 || addr >= sizeof(struct user)) {
                        ret = -EIO;
                        break ;
                  }
                  
                    ret = 0;  /* Default return condition */
                  addr = addr >> 2; /* temporary hack. */

                  if (addr < H8300_REGS_NO)
                        tmp = h8300_get_reg(child, addr);
                  else {
                        switch(addr) {
                        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,(unsigned long *) data);
                  break ;
            }

      /* when I and D space are separate, this will have to be fixed. */
            case PTRACE_POKETEXT: /* write the word at location addr. */
            case PTRACE_POKEDATA:
                  ret = generic_ptrace_pokedata(child, addr, data);
                  break;

            case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
                  if ((addr & 3) || addr < 0 || addr >= sizeof(struct user)) {
                        ret = -EIO;
                        break ;
                  }
                  addr = addr >> 2; /* temporary hack. */
                      
                  if (addr == PT_ORIG_ER0) {
                        ret = -EIO;
                        break ;
                  }
                  if (addr < H8300_REGS_NO) {
                        ret = h8300_put_reg(child, addr, data);
                        break ;
                  }
                  ret = -EIO;
                  break ;
            case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
            case PTRACE_CONT: { /* restart after signal. */
                  ret = -EIO;
                  if (!valid_signal(data))
                        break ;
                  if (request == PTRACE_SYSCALL)
                        set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
                  else
                        clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
                  child->exit_code = data;
                  wake_up_process(child);
                  /* make sure the single step bit is not set. */
                  h8300_disable_trace(child);
                  ret = 0;
            }

/*
 * make the child exit.  Best I can do is send it a sigkill. 
 * perhaps it should be put in the status that it wants to 
 * exit.
 */
            case PTRACE_KILL: {

                  ret = 0;
                  if (child->exit_state == EXIT_ZOMBIE) /* already dead */
                        break;
                  child->exit_code = SIGKILL;
                  h8300_disable_trace(child);
                  wake_up_process(child);
                  break;
            }

            case PTRACE_SINGLESTEP: {  /* set the trap flag. */
                  ret = -EIO;
                  if (!valid_signal(data))
                        break;
                  clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
                  child->exit_code = data;
                  h8300_enable_trace(child);
                  wake_up_process(child);
                  ret = 0;
                  break;
            }

            case PTRACE_DETACH:     /* detach a process that was attached. */
                  ret = ptrace_detach(child, data);
                  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, (unsigned long *) data)) {
                        ret = -EFAULT;
                        break;
                      }
                      data += sizeof(long);
                  }
                  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, (unsigned long *) data)) {
                        ret = -EFAULT;
                        break;
                      }
                      h8300_put_reg(child, i, tmp);
                      data += sizeof(long);
                  }
                  ret = 0;
                  break;
            }

            default:
                  ret = -EIO;
                  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;
      }
}

Generated by  Doxygen 1.6.0   Back to index