child->thread.work.syscall_trace = 0;
clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
long arch_ptrace(struct task_struct *child, long request, long addr, long data){	unsigned long tmp;	int i, ret = 0;	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:		i = access_process_vm(child, addr, &tmp, sizeof(tmp), 0);		if (i != sizeof(tmp))			goto out_eio;		ret = put_user(tmp, (unsigned long *)data);		break;	/* read the word at location addr in the USER area. */	case PTRACE_PEEKUSR:		if (addr & 3)			goto out_eio;		addr >>= 2;	/* temporary hack. */		if (addr >= 0 && addr < 19) {			tmp = get_reg(child, addr);			if (addr == PT_SR)				tmp >>= 16;		} else if (addr >= 21 && addr < 49) {			tmp = child->thread.fp[addr - 21];			/* Convert internal fpu reg representation			 * into long double format			 */			if (FPU_IS_EMU && (addr < 45) && !(addr % 3))				tmp = ((tmp & 0xffff0000) << 15) |				      ((tmp & 0x0000ffff) << 16);		} else			break;		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:		if (access_process_vm(child, addr, &data, sizeof(data), 1) != sizeof(data))			goto out_eio;		break;	case PTRACE_POKEUSR:	/* write the word at location addr in the USER area */		if (addr & 3)			goto out_eio;		addr >>= 2;	/* temporary hack. */		if (addr == PT_SR) {			data &= SR_MASK;			data <<= 16;			data |= get_reg(child, PT_SR) & ~(SR_MASK << 16);		} else if (addr >= 0 && addr < 19) {			if (put_reg(child, addr, data))				goto out_eio;		} else if (addr >= 21 && addr < 48) {			/* Convert long double format			 * into internal fpu reg representation			 */			if (FPU_IS_EMU && (addr < 45) && !(addr % 3)) {				data = (unsigned long)data << 15;				data = (data & 0xffff0000) |				       ((data & 0x0000ffff) >> 1);			}			child->thread.fp[addr - 21] = data;		} else			goto out_eio;		break;	case PTRACE_SYSCALL:	/* continue and stop at next (return from) syscall */	case PTRACE_CONT:	/* restart after signal. */		if (!valid_signal(data))			goto out_eio;		if (request == PTRACE_SYSCALL)			child->thread.work.syscall_trace = ~0;		else			child->thread.work.syscall_trace = 0;		child->exit_code = data;		singlestep_disable(child);		wake_up_process(child);		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:		if (child->exit_state == EXIT_ZOMBIE) /* already dead */			break;		child->exit_code = SIGKILL;		singlestep_disable(child);		wake_up_process(child);		break;	case PTRACE_SINGLESTEP:	/* set the trap flag. */		if (!valid_signal(data))			goto out_eio;		child->thread.work.syscall_trace = 0;		tmp = get_reg(child, PT_SR) | (TRACE_BITS << 16);		put_reg(child, PT_SR, tmp);		child->thread.work.delayed_trace = 1;		child->exit_code = data;		/* give it a chance to run. */		wake_up_process(child);		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. */		for (i = 0; i < 19; i++) {			tmp = get_reg(child, i);			if (i == PT_SR)				tmp >>= 16;			ret = put_user(tmp, (unsigned long *)data);			if (ret)				break;			data += sizeof(long);		}		break;	case PTRACE_SETREGS:	/* Set all gp regs in the child. */		for (i = 0; i < 19; i++) {			ret = get_user(tmp, (unsigned long *)data);			if (ret)				break;			if (i == PT_SR) {				tmp &= SR_MASK;				tmp <<= 16;				tmp |= get_reg(child, PT_SR) & ~(SR_MASK << 16);			}			put_reg(child, i, tmp);			data += sizeof(long);		}		break;	case PTRACE_GETFPREGS:	/* Get the child FPU state. */		if (copy_to_user((void *)data, &child->thread.fp,				 sizeof(struct user_m68kfp_struct)))			ret = -EFAULT;		break;	case PTRACE_SETFPREGS:	/* Set the child FPU state. */		if (copy_from_user(&child->thread.fp, (void *)data,				   sizeof(struct user_m68kfp_struct)))			ret = -EFAULT;		break;	default:		ret = ptrace_request(child, request, addr, data);		break;	}	return ret;out_eio:	return -EIO;}