int sys_ptrace(long request, long pid, long addr, long data) 
long sys_ptrace(long request, long pid, long addr, long data) 
int sys_ptrace(long request, long pid, long addr, long data){	struct task_struct *child;	int ret = -EPERM;	lock_kernel();	if (request == PTRACE_TRACEME) {		/* are we already being traced? */		if (current->ptrace & PT_PTRACED)			goto out;		ret = security_ptrace(current->parent, current);		if (ret)			goto out;		/* set the ptrace bit in the process flags. */		current->ptrace |= PT_PTRACED;		ret = 0;		goto out;	}	ret = -ESRCH;	read_lock(&tasklist_lock);	child = find_task_by_pid(pid);	if (child)		get_task_struct(child);	read_unlock(&tasklist_lock);	if (!child)		goto out;	ret = -EPERM;	if (pid == 1)		/* you may not mess with init */		goto out_tsk;	if (request == PTRACE_ATTACH) {		ret = ptrace_attach(child);		goto out_tsk;	}	ret = ptrace_check_attach(child, request == PTRACE_KILL);	if (ret < 0)		goto out_tsk;	switch (request) {	/* when I and D space are separate, these will need to be fixed. */	case PTRACE_PEEKTEXT: /* read word at location addr. */ 	case PTRACE_PEEKDATA: {		unsigned long tmp;		int copied;		copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0);		ret = -EIO;		if (copied != sizeof(tmp))			break;		ret = put_user(tmp,(unsigned long __user *) data);		break;	}	/* read the word at location addr in the USER area. */	case PTRACE_PEEKUSR: {		unsigned long index;		unsigned long tmp;		ret = -EIO;		/* convert to index and check */		index = (unsigned long) addr >> 3;		if ((addr & 7) || (index > PT_FPSCR))			break;		if (index < PT_FPR0) {			tmp = get_reg(child, (int)index);		} else {			flush_fp_to_thread(child);			tmp = ((unsigned long *)child->thread.fpr)[index - PT_FPR0];		}		ret = put_user(tmp,(unsigned long __user *) data);		break;	}	/* If 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 = 0;		if (access_process_vm(child, addr, &data, sizeof(data), 1)				== sizeof(data))			break;		ret = -EIO;		break;	/* write the word at location addr in the USER area */	case PTRACE_POKEUSR: {		unsigned long index;		ret = -EIO;		/* convert to index and check */		index = (unsigned long) addr >> 3;		if ((addr & 7) || (index > PT_FPSCR))			break;		if (index == PT_ORIG_R3)			break;		if (index < PT_FPR0) {			ret = put_reg(child, index, data);		} else {			flush_fp_to_thread(child);			((unsigned long *)child->thread.fpr)[index - PT_FPR0] = data;			ret = 0;		}		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;		/* make sure the single step bit is not set. */		clear_single_step(child);		wake_up_process(child);		ret = 0;		break;	}	/*	 * 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;		/* make sure the single step bit is not set. */		clear_single_step(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);		set_single_step(child);		child->exit_code = data;		/* give it a chance to run. */		wake_up_process(child);		ret = 0;		break;	}	case PTRACE_GET_DEBUGREG: {		ret = -EINVAL;		/* We only support one DABR and no IABRS at the moment */		if (addr > 0)			break;		ret = put_user(child->thread.dabr,			       (unsigned long __user *)data);		break;	}	case PTRACE_SET_DEBUGREG:		ret = ptrace_set_debugreg(child, addr, data);		break;	case PTRACE_DETACH:		ret = ptrace_detach(child, data);		break;	case PPC_PTRACE_GETREGS: { /* Get GPRs 0 - 31. */		int i;		unsigned long *reg = &((unsigned long *)child->thread.regs)[0];		unsigned long __user *tmp = (unsigned long __user *)addr;		for (i = 0; i < 32; i++) {			ret = put_user(*reg, tmp);			if (ret)				break;			reg++;			tmp++;		}		break;	}	case PPC_PTRACE_SETREGS: { /* Set GPRs 0 - 31. */		int i;		unsigned long *reg = &((unsigned long *)child->thread.regs)[0];		unsigned long __user *tmp = (unsigned long __user *)addr;		for (i = 0; i < 32; i++) {			ret = get_user(*reg, tmp);			if (ret)				break;			reg++;			tmp++;		}		break;	}	case PPC_PTRACE_GETFPREGS: { /* Get FPRs 0 - 31. */		int i;		unsigned long *reg = &((unsigned long *)child->thread.fpr)[0];		unsigned long __user *tmp = (unsigned long __user *)addr;		flush_fp_to_thread(child);		for (i = 0; i < 32; i++) {			ret = put_user(*reg, tmp);			if (ret)				break;			reg++;			tmp++;		}		break;	}	case PPC_PTRACE_SETFPREGS: { /* Get FPRs 0 - 31. */		int i;		unsigned long *reg = &((unsigned long *)child->thread.fpr)[0];		unsigned long __user *tmp = (unsigned long __user *)addr;		flush_fp_to_thread(child);		for (i = 0; i < 32; i++) {			ret = get_user(*reg, tmp);			if (ret)				break;			reg++;			tmp++;		}		break;	}#ifdef CONFIG_ALTIVEC	case PTRACE_GETVRREGS:		/* Get the child altivec register state. */		flush_altivec_to_thread(child);		ret = get_vrregs((unsigned long __user *)data, child);		break;	case PTRACE_SETVRREGS:		/* Set the child altivec register state. */		flush_altivec_to_thread(child);		ret = set_vrregs(child, (unsigned long __user *)data);		break;#endif	default:		ret = ptrace_request(child, request, addr, data);		break;	}out_tsk:	put_task_struct(child);out:	unlock_kernel();	return ret;}
4520	/local/tlutelli/issta_data/temp/c/2005_temp/2005/4520/dfb7dac3af623a68262536437af008ed6aba4d88/ptrace.c/clean/arch/ppc64/kernel/ptrace.c