[net-next-2.6.git] / arch / avr32 / kernel / ptrace.c

/*
 * Copyright (C) 2004-2006 Atmel Corporation
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#undef DEBUG
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/ptrace.h>
#include <linux/errno.h>
#include <linux/user.h>
#include <linux/security.h>
#include <linux/unistd.h>
#include <linux/notifier.h>

#include <asm/traps.h>
#include <asm/uaccess.h>
#include <asm/ocd.h>
#include <asm/mmu_context.h>
#include <linux/kdebug.h>

static struct pt_regs *get_user_regs(struct task_struct *tsk)
{
	return (struct pt_regs *)((unsigned long)task_stack_page(tsk) +
				  THREAD_SIZE - sizeof(struct pt_regs));
}

void user_enable_single_step(struct task_struct *tsk)
{
	pr_debug("user_enable_single_step: pid=%u, PC=0x%08lx, SR=0x%08lx\n",
		 tsk->pid, task_pt_regs(tsk)->pc, task_pt_regs(tsk)->sr);

	/*
	 * We can't schedule in Debug mode, so when TIF_BREAKPOINT is
	 * set, the system call or exception handler will do a
	 * breakpoint to enter monitor mode before returning to
	 * userspace.
	 *
	 * The monitor code will then notice that TIF_SINGLE_STEP is
	 * set and return to userspace with single stepping enabled.
	 * The CPU will then enter monitor mode again after exactly
	 * one instruction has been executed, and the monitor code
	 * will then send a SIGTRAP to the process.
	 */
	set_tsk_thread_flag(tsk, TIF_BREAKPOINT);
	set_tsk_thread_flag(tsk, TIF_SINGLE_STEP);
}

void user_disable_single_step(struct task_struct *child)
{
	/* XXX(hch): a no-op here seems wrong.. */
}

/*
 * Called by kernel/ptrace.c when detaching
 *
 * Make sure any single step bits, etc. are not set
 */
void ptrace_disable(struct task_struct *child)
{
	clear_tsk_thread_flag(child, TIF_SINGLE_STEP);
	clear_tsk_thread_flag(child, TIF_BREAKPOINT);
	ocd_disable(child);
}

/*
 * Read the word at offset "offset" into the task's "struct user". We
 * actually access the pt_regs struct stored on the kernel stack.
 */
static int ptrace_read_user(struct task_struct *tsk, unsigned long offset,
			    unsigned long __user *data)
{
	unsigned long *regs;
	unsigned long value;

	if (offset & 3 || offset >= sizeof(struct user)) {
		printk("ptrace_read_user: invalid offset 0x%08lx\n", offset);
		return -EIO;
	}

	regs = (unsigned long *)get_user_regs(tsk);

	value = 0;
	if (offset < sizeof(struct pt_regs))
		value = regs[offset / sizeof(regs[0])];

	pr_debug("ptrace_read_user(%s[%u], %#lx, %p) -> %#lx\n",
		 tsk->comm, tsk->pid, offset, data, value);

	return put_user(value, data);
}

/*
 * Write the word "value" to offset "offset" into the task's "struct
 * user". We actually access the pt_regs struct stored on the kernel
 * stack.
 */
static int ptrace_write_user(struct task_struct *tsk, unsigned long offset,
			     unsigned long value)
{
	unsigned long *regs;

	pr_debug("ptrace_write_user(%s[%u], %#lx, %#lx)\n",
			tsk->comm, tsk->pid, offset, value);

	if (offset & 3 || offset >= sizeof(struct user)) {
		pr_debug("  invalid offset 0x%08lx\n", offset);
		return -EIO;
	}

	if (offset >= sizeof(struct pt_regs))
		return 0;

	regs = (unsigned long *)get_user_regs(tsk);
	regs[offset / sizeof(regs[0])] = value;

	return 0;
}

static int ptrace_getregs(struct task_struct *tsk, void __user *uregs)
{
	struct pt_regs *regs = get_user_regs(tsk);

	return copy_to_user(uregs, regs, sizeof(*regs)) ? -EFAULT : 0;
}

static int ptrace_setregs(struct task_struct *tsk, const void __user *uregs)
{
	struct pt_regs newregs;
	int ret;

	ret = -EFAULT;
	if (copy_from_user(&newregs, uregs, sizeof(newregs)) == 0) {
		struct pt_regs *regs = get_user_regs(tsk);

		ret = -EINVAL;
		if (valid_user_regs(&newregs)) {
			*regs = newregs;
			ret = 0;
		}
	}

	return ret;
}

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

	switch (request) {
	/* Read the word at location addr in the child process */
	case PTRACE_PEEKTEXT:
	case PTRACE_PEEKDATA:
		ret = generic_ptrace_peekdata(child, addr, data);
		break;

	case PTRACE_PEEKUSR:
		ret = ptrace_read_user(child, addr, datap);
		break;

	/* Write the word in data at location addr */
	case PTRACE_POKETEXT:
	case PTRACE_POKEDATA:
		ret = generic_ptrace_pokedata(child, addr, data);
		break;

	case PTRACE_POKEUSR:
		ret = ptrace_write_user(child, addr, data);
		break;

	case PTRACE_GETREGS:
		ret = ptrace_getregs(child, datap);
		break;

	case PTRACE_SETREGS:
		ret = ptrace_setregs(child, datap);
		break;

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

	return ret;
}

asmlinkage void syscall_trace(void)
{
	if (!test_thread_flag(TIF_SYSCALL_TRACE))
		return;
	if (!(current->ptrace & PT_PTRACED))
		return;

	/* The 0x80 provides a way for the tracing parent to
	 * distinguish between a syscall stop and SIGTRAP delivery */
	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) {
		pr_debug("syscall_trace: sending signal %d to PID %u\n",
			 current->exit_code, current->pid);
		send_sig(current->exit_code, current, 1);
		current->exit_code = 0;
	}
}

/*
 * debug_trampoline() is an assembly stub which will store all user
 * registers on the stack and execute a breakpoint instruction.
 *
 * If we single-step into an exception handler which runs with
 * interrupts disabled the whole time so it doesn't have to check for
 * pending work, its return address will be modified so that it ends
 * up returning to debug_trampoline.
 *
 * If the exception handler decides to store the user context and
 * enable interrupts after all, it will restore the original return
 * address and status register value. Before it returns, it will
 * notice that TIF_BREAKPOINT is set and execute a breakpoint
 * instruction.
 */
extern void debug_trampoline(void);

asmlinkage struct pt_regs *do_debug(struct pt_regs *regs)
{
	struct thread_info	*ti;
	unsigned long		trampoline_addr;
	u32			status;
	u32			ctrl;
	int			code;

	status = ocd_read(DS);
	ti = current_thread_info();
	code = TRAP_BRKPT;

	pr_debug("do_debug: status=0x%08x PC=0x%08lx SR=0x%08lx tif=0x%08lx\n",
			status, regs->pc, regs->sr, ti->flags);

	if (!user_mode(regs)) {
		unsigned long	die_val = DIE_BREAKPOINT;

		if (status & (1 << OCD_DS_SSS_BIT))
			die_val = DIE_SSTEP;

		if (notify_die(die_val, "ptrace", regs, 0, 0, SIGTRAP)
				== NOTIFY_STOP)
			return regs;

		if ((status & (1 << OCD_DS_SWB_BIT))
				&& test_and_clear_ti_thread_flag(
					ti, TIF_BREAKPOINT)) {
			/*
			 * Explicit breakpoint from trampoline or
			 * exception/syscall/interrupt handler.
			 *
			 * The real saved regs are on the stack right
			 * after the ones we saved on entry.
			 */
			regs++;
			pr_debug("  -> TIF_BREAKPOINT done, adjusted regs:"
					"PC=0x%08lx SR=0x%08lx\n",
					regs->pc, regs->sr);
			BUG_ON(!user_mode(regs));

			if (test_thread_flag(TIF_SINGLE_STEP)) {
				pr_debug("Going to do single step...\n");
				return regs;
			}

			/*
			 * No TIF_SINGLE_STEP means we're done
			 * stepping over a syscall. Do the trap now.
			 */
			code = TRAP_TRACE;
		} else if ((status & (1 << OCD_DS_SSS_BIT))
				&& test_ti_thread_flag(ti, TIF_SINGLE_STEP)) {

			pr_debug("Stepped into something, "
					"setting TIF_BREAKPOINT...\n");
			set_ti_thread_flag(ti, TIF_BREAKPOINT);

			/*
			 * We stepped into an exception, interrupt or
			 * syscall handler. Some exception handlers
			 * don't check for pending work, so we need to
			 * set up a trampoline just in case.
			 *
			 * The exception entry code will undo the
			 * trampoline stuff if it does a full context
			 * save (which also means that it'll check for
			 * pending work later.)
			 */
			if ((regs->sr & MODE_MASK) == MODE_EXCEPTION) {
				trampoline_addr
					= (unsigned long)&debug_trampoline;

				pr_debug("Setting up trampoline...\n");
				ti->rar_saved = sysreg_read(RAR_EX);
				ti->rsr_saved = sysreg_read(RSR_EX);
				sysreg_write(RAR_EX, trampoline_addr);
				sysreg_write(RSR_EX, (MODE_EXCEPTION
							| SR_EM | SR_GM));
				BUG_ON(ti->rsr_saved & MODE_MASK);
			}

			/*
			 * If we stepped into a system call, we
			 * shouldn't do a single step after we return
			 * since the return address is right after the
			 * "scall" instruction we were told to step
			 * over.
			 */
			if ((regs->sr & MODE_MASK) == MODE_SUPERVISOR) {
				pr_debug("Supervisor; no single step\n");
				clear_ti_thread_flag(ti, TIF_SINGLE_STEP);
			}

			ctrl = ocd_read(DC);
			ctrl &= ~(1 << OCD_DC_SS_BIT);
			ocd_write(DC, ctrl);

			return regs;
		} else {
			printk(KERN_ERR "Unexpected OCD_DS value: 0x%08x\n",
					status);
			printk(KERN_ERR "Thread flags: 0x%08lx\n", ti->flags);
			die("Unhandled debug trap in kernel mode",
					regs, SIGTRAP);
		}
	} else if (status & (1 << OCD_DS_SSS_BIT)) {
		/* Single step in user mode */
		code = TRAP_TRACE;

		ctrl = ocd_read(DC);
		ctrl &= ~(1 << OCD_DC_SS_BIT);
		ocd_write(DC, ctrl);
	}

	pr_debug("Sending SIGTRAP: code=%d PC=0x%08lx SR=0x%08lx\n",
			code, regs->pc, regs->sr);

	clear_thread_flag(TIF_SINGLE_STEP);
	_exception(SIGTRAP, regs, code, instruction_pointer(regs));

	return regs;
}
Commit	Line	Data
5f97f7f9 HS	1	/*
	2	* Copyright (C) 2004-2006 Atmel Corporation
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License version 2 as
	6	* published by the Free Software Foundation.
	7	*/
	8	#undef DEBUG
	9	#include <linux/kernel.h>
	10	#include <linux/sched.h>
	11	#include <linux/mm.h>
5f97f7f9 HS	12	#include <linux/ptrace.h>
	13	#include <linux/errno.h>
	14	#include <linux/user.h>
	15	#include <linux/security.h>
	16	#include <linux/unistd.h>
	17	#include <linux/notifier.h>
	18
	19	#include <asm/traps.h>
	20	#include <asm/uaccess.h>
	21	#include <asm/ocd.h>
	22	#include <asm/mmu_context.h>
1eeb66a1	23	#include <linux/kdebug.h>
5f97f7f9 HS	24
	25	static struct pt_regs get_user_regs(struct task_struct tsk)
	26	{
c9f4f06d	27	return (struct pt_regs *)((unsigned long)task_stack_page(tsk) +
5f97f7f9 HS	28	THREAD_SIZE - sizeof(struct pt_regs));
	29	}
	30
9e584fbb	31	void user_enable_single_step(struct task_struct *tsk)
5f97f7f9	32	{
1d839317	33	pr_debug("user_enable_single_step: pid=%u, PC=0x%08lx, SR=0x%08lx\n",
2507bc13	34	tsk->pid, task_pt_regs(tsk)->pc, task_pt_regs(tsk)->sr);
5f97f7f9	35
2507bc13 HS	36	/*
	37	* We can't schedule in Debug mode, so when TIF_BREAKPOINT is
	38	* set, the system call or exception handler will do a
	39	* breakpoint to enter monitor mode before returning to
	40	* userspace.
	41	*
	42	* The monitor code will then notice that TIF_SINGLE_STEP is
	43	* set and return to userspace with single stepping enabled.
	44	* The CPU will then enter monitor mode again after exactly
	45	* one instruction has been executed, and the monitor code
	46	* will then send a SIGTRAP to the process.
	47	*/
	48	set_tsk_thread_flag(tsk, TIF_BREAKPOINT);
5f97f7f9 HS	49	set_tsk_thread_flag(tsk, TIF_SINGLE_STEP);
	50	}
	51
1d839317 CH	52	void user_disable_single_step(struct task_struct *child)
	53	{
	54	/* XXX(hch): a no-op here seems wrong.. */
	55	}
	56
5f97f7f9 HS	57	/*
	58	* Called by kernel/ptrace.c when detaching
	59	*
	60	* Make sure any single step bits, etc. are not set
	61	*/
	62	void ptrace_disable(struct task_struct *child)
	63	{
	64	clear_tsk_thread_flag(child, TIF_SINGLE_STEP);
2507bc13	65	clear_tsk_thread_flag(child, TIF_BREAKPOINT);
13b54a50	66	ocd_disable(child);
5f97f7f9 HS	67	}
	68
	69	/*
	70	* Read the word at offset "offset" into the task's "struct user". We
	71	* actually access the pt_regs struct stored on the kernel stack.
	72	*/
	73	static int ptrace_read_user(struct task_struct *tsk, unsigned long offset,
	74	unsigned long __user *data)
	75	{
	76	unsigned long *regs;
	77	unsigned long value;
	78
5f97f7f9 HS	79	if (offset & 3 \|\| offset >= sizeof(struct user)) {
	80	printk("ptrace_read_user: invalid offset 0x%08lx\n", offset);
	81	return -EIO;
	82	}
	83
	84	regs = (unsigned long *)get_user_regs(tsk);
	85
	86	value = 0;
	87	if (offset < sizeof(struct pt_regs))
	88	value = regs[offset / sizeof(regs[0])];
	89
2507bc13 HS	90	pr_debug("ptrace_read_user(%s[%u], %#lx, %p) -> %#lx\n",
	91	tsk->comm, tsk->pid, offset, data, value);
	92
5f97f7f9 HS	93	return put_user(value, data);
	94	}
	95
	96	/*
	97	* Write the word "value" to offset "offset" into the task's "struct
	98	* user". We actually access the pt_regs struct stored on the kernel
	99	* stack.
	100	*/
	101	static int ptrace_write_user(struct task_struct *tsk, unsigned long offset,
	102	unsigned long value)
	103	{
	104	unsigned long *regs;
	105
2507bc13 HS	106	pr_debug("ptrace_write_user(%s[%u], %#lx, %#lx)\n",
	107	tsk->comm, tsk->pid, offset, value);
	108
5f97f7f9	109	if (offset & 3 \|\| offset >= sizeof(struct user)) {
2507bc13	110	pr_debug(" invalid offset 0x%08lx\n", offset);
5f97f7f9 HS	111	return -EIO;
	112	}
	113
	114	if (offset >= sizeof(struct pt_regs))
	115	return 0;
	116
	117	regs = (unsigned long *)get_user_regs(tsk);
	118	regs[offset / sizeof(regs[0])] = value;
	119
	120	return 0;
	121	}
	122
	123	static int ptrace_getregs(struct task_struct tsk, void __user uregs)
	124	{
	125	struct pt_regs *regs = get_user_regs(tsk);
	126
	127	return copy_to_user(uregs, regs, sizeof(*regs)) ? -EFAULT : 0;
	128	}
	129
	130	static int ptrace_setregs(struct task_struct tsk, const void __user uregs)
	131	{
	132	struct pt_regs newregs;
	133	int ret;
	134
	135	ret = -EFAULT;
	136	if (copy_from_user(&newregs, uregs, sizeof(newregs)) == 0) {
	137	struct pt_regs *regs = get_user_regs(tsk);
	138
	139	ret = -EINVAL;
	140	if (valid_user_regs(&newregs)) {
	141	*regs = newregs;
	142	ret = 0;
	143	}
	144	}
	145
	146	return ret;
	147	}
	148
9b05a69e NK	149	long arch_ptrace(struct task_struct *child, long request,
9b05a69e NK	150	unsigned long addr, unsigned long data)
5f97f7f9	151	{
5f97f7f9	152	int ret;
9f29b8fb	153	void __user datap = (void __user ) data;
5f97f7f9	154
5f97f7f9 HS	155	switch (request) {
	156	/* Read the word at location addr in the child process */
	157	case PTRACE_PEEKTEXT:
	158	case PTRACE_PEEKDATA:
76647323	159	ret = generic_ptrace_peekdata(child, addr, data);
5f97f7f9 HS	160	break;
	161
	162	case PTRACE_PEEKUSR:
9f29b8fb	163	ret = ptrace_read_user(child, addr, datap);
5f97f7f9 HS	164	break;
	165
	166	/* Write the word in data at location addr */
	167	case PTRACE_POKETEXT:
	168	case PTRACE_POKEDATA:
f284ce72	169	ret = generic_ptrace_pokedata(child, addr, data);
5f97f7f9 HS	170	break;
	171
	172	case PTRACE_POKEUSR:
	173	ret = ptrace_write_user(child, addr, data);
	174	break;
	175
5f97f7f9	176	case PTRACE_GETREGS:
9f29b8fb	177	ret = ptrace_getregs(child, datap);
5f97f7f9 HS	178	break;
	179
	180	case PTRACE_SETREGS:
9f29b8fb	181	ret = ptrace_setregs(child, datap);
5f97f7f9 HS	182	break;
	183
	184	default:
	185	ret = ptrace_request(child, request, addr, data);
	186	break;
	187	}
	188
5f97f7f9 HS	189	return ret;
	190	}
	191
	192	asmlinkage void syscall_trace(void)
	193	{
5f97f7f9 HS	194	if (!test_thread_flag(TIF_SYSCALL_TRACE))
	195	return;
	196	if (!(current->ptrace & PT_PTRACED))
	197	return;
	198
5f97f7f9 HS	199	/* The 0x80 provides a way for the tracing parent to
	200	* distinguish between a syscall stop and SIGTRAP delivery */
	201	ptrace_notify(SIGTRAP \| ((current->ptrace & PT_TRACESYSGOOD)
	202	? 0x80 : 0));
	203
	204	/*
	205	* this isn't the same as continuing with a signal, but it
	206	* will do for normal use. strace only continues with a
	207	* signal if the stopping signal is not SIGTRAP. -brl
	208	*/
	209	if (current->exit_code) {
	210	pr_debug("syscall_trace: sending signal %d to PID %u\n",
	211	current->exit_code, current->pid);
	212	send_sig(current->exit_code, current, 1);
	213	current->exit_code = 0;
	214	}
	215	}
	216
5f97f7f9	217	/*
2507bc13 HS	218	* debug_trampoline() is an assembly stub which will store all user
	219	* registers on the stack and execute a breakpoint instruction.
	220	*
	221	* If we single-step into an exception handler which runs with
	222	* interrupts disabled the whole time so it doesn't have to check for
	223	* pending work, its return address will be modified so that it ends
	224	* up returning to debug_trampoline.
	225	*
	226	* If the exception handler decides to store the user context and
	227	* enable interrupts after all, it will restore the original return
	228	* address and status register value. Before it returns, it will
	229	* notice that TIF_BREAKPOINT is set and execute a breakpoint
	230	* instruction.
5f97f7f9	231	*/
2507bc13	232	extern void debug_trampoline(void);
5f97f7f9	233
2507bc13 HS	234	asmlinkage struct pt_regs do_debug(struct pt_regs regs)
	235	{
	236	struct thread_info *ti;
	237	unsigned long trampoline_addr;
	238	u32 status;
	239	u32 ctrl;
	240	int code;
	241
	242	status = ocd_read(DS);
	243	ti = current_thread_info();
	244	code = TRAP_BRKPT;
	245
	246	pr_debug("do_debug: status=0x%08x PC=0x%08lx SR=0x%08lx tif=0x%08lx\n",
	247	status, regs->pc, regs->sr, ti->flags);
	248
	249	if (!user_mode(regs)) {
	250	unsigned long die_val = DIE_BREAKPOINT;
	251
	252	if (status & (1 << OCD_DS_SSS_BIT))
	253	die_val = DIE_SSTEP;
	254
	255	if (notify_die(die_val, "ptrace", regs, 0, 0, SIGTRAP)
	256	== NOTIFY_STOP)
	257	return regs;
	258
	259	if ((status & (1 << OCD_DS_SWB_BIT))
	260	&& test_and_clear_ti_thread_flag(
	261	ti, TIF_BREAKPOINT)) {
	262	/*
	263	* Explicit breakpoint from trampoline or
	264	* exception/syscall/interrupt handler.
	265	*
	266	* The real saved regs are on the stack right
	267	* after the ones we saved on entry.
	268	*/
	269	regs++;
	270	pr_debug(" -> TIF_BREAKPOINT done, adjusted regs:"
	271	"PC=0x%08lx SR=0x%08lx\n",
	272	regs->pc, regs->sr);
	273	BUG_ON(!user_mode(regs));
	274
	275	if (test_thread_flag(TIF_SINGLE_STEP)) {
	276	pr_debug("Going to do single step...\n");
	277	return regs;
	278	}
	279
	280	/*
	281	* No TIF_SINGLE_STEP means we're done
	282	* stepping over a syscall. Do the trap now.
	283	*/
	284	code = TRAP_TRACE;
	285	} else if ((status & (1 << OCD_DS_SSS_BIT))
	286	&& test_ti_thread_flag(ti, TIF_SINGLE_STEP)) {
	287
	288	pr_debug("Stepped into something, "
	289	"setting TIF_BREAKPOINT...\n");
	290	set_ti_thread_flag(ti, TIF_BREAKPOINT);
	291
	292	/*
	293	* We stepped into an exception, interrupt or
	294	* syscall handler. Some exception handlers
	295	* don't check for pending work, so we need to
	296	* set up a trampoline just in case.
	297	*
298	* The exception entry code will undo the
299	* trampoline stuff if it does a full context
300	* save (which also means that it'll check for
301	* pending work later.)
302	*/
303	if ((regs->sr & MODE_MASK) == MODE_EXCEPTION) {
304	trampoline_addr
305	= (unsigned long)&debug_trampoline;
306
307	pr_debug("Setting up trampoline...\n");
308	ti->rar_saved = sysreg_read(RAR_EX);
309	ti->rsr_saved = sysreg_read(RSR_EX);
310	sysreg_write(RAR_EX, trampoline_addr);
311	sysreg_write(RSR_EX, (MODE_EXCEPTION
312	\| SR_EM \| SR_GM));
313	BUG_ON(ti->rsr_saved & MODE_MASK);
314	}
315
316	/*
317	* If we stepped into a system call, we
318	* shouldn't do a single step after we return
319	* since the return address is right after the
320	* "scall" instruction we were told to step
321	* over.
322	*/
323	if ((regs->sr & MODE_MASK) == MODE_SUPERVISOR) {
324	pr_debug("Supervisor; no single step\n");
325	clear_ti_thread_flag(ti, TIF_SINGLE_STEP);
326	}
327
328	ctrl = ocd_read(DC);
329	ctrl &= ~(1 << OCD_DC_SS_BIT);
330	ocd_write(DC, ctrl);
331
332	return regs;
333	} else {
334	printk(KERN_ERR "Unexpected OCD_DS value: 0x%08x\n",
335	status);
336	printk(KERN_ERR "Thread flags: 0x%08lx\n", ti->flags);
337	die("Unhandled debug trap in kernel mode",
338	regs, SIGTRAP);
339	}
340	} else if (status & (1 << OCD_DS_SSS_BIT)) {
341	/* Single step in user mode */
342	code = TRAP_TRACE;
5f97f7f9	343
2507bc13 HS	344	ctrl = ocd_read(DC);
	345	ctrl &= ~(1 << OCD_DC_SS_BIT);
	346	ocd_write(DC, ctrl);
5f97f7f9 HS	347	}
5f97f7f9 HS	348
2507bc13 HS	349	pr_debug("Sending SIGTRAP: code=%d PC=0x%08lx SR=0x%08lx\n",
2507bc13 HS	350	code, regs->pc, regs->sr);
5f97f7f9	351
2507bc13 HS	352	clear_thread_flag(TIF_SINGLE_STEP);
	353	_exception(SIGTRAP, regs, code, instruction_pointer(regs));
	354
	355	return regs;
5f97f7f9	356	}