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

/*
 * linux/kernel/ptrace.c is by Ross Biro 1/23/92, edited by Linus Torvalds
 * these modifications are Copyright 2004-2010 Analog Devices Inc.
 *
 * Licensed under the GPL-2
 */

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

#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/system.h>
#include <asm/processor.h>
#include <asm/asm-offsets.h>
#include <asm/dma.h>
#include <asm/fixed_code.h>
#include <asm/cacheflush.h>
#include <asm/mem_map.h>
#include <asm/mmu_context.h>

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

/*
 * Get contents of register REGNO in task TASK.
 */
static inline long
get_reg(struct task_struct *task, long regno, unsigned long __user *datap)
{
	long tmp;
	struct pt_regs *regs = task_pt_regs(task);

	if (regno & 3 || regno > PT_LAST_PSEUDO || regno < 0)
		return -EIO;

	switch (regno) {
	case PT_TEXT_ADDR:
		tmp = task->mm->start_code;
		break;
	case PT_TEXT_END_ADDR:
		tmp = task->mm->end_code;
		break;
	case PT_DATA_ADDR:
		tmp = task->mm->start_data;
		break;
	case PT_USP:
		tmp = task->thread.usp;
		break;
	default:
		if (regno < sizeof(*regs)) {
			void *reg_ptr = regs;
			tmp = *(long *)(reg_ptr + regno);
		} else
			return -EIO;
	}

	return put_user(tmp, datap);
}

/*
 * Write contents of register REGNO in task TASK.
 */
static inline int
put_reg(struct task_struct *task, long regno, unsigned long data)
{
	struct pt_regs *regs = task_pt_regs(task);

	if (regno & 3 || regno > PT_LAST_PSEUDO || regno < 0)
		return -EIO;

	switch (regno) {
	case PT_PC:
		/*********************************************************************/
		/* At this point the kernel is most likely in exception.             */
		/* The RETX register will be used to populate the pc of the process. */
		/*********************************************************************/
		regs->retx = data;
		regs->pc = data;
		break;
	case PT_RETX:
		break;		/* regs->retx = data; break; */
	case PT_USP:
		regs->usp = data;
		task->thread.usp = data;
		break;
	case PT_SYSCFG:	/* don't let userspace screw with this */
		if ((data & ~1) != 0x6)
			pr_warning("ptrace: ignore syscfg write of %#lx\n", data);
		break;		/* regs->syscfg = data; break; */
	default:
		if (regno < sizeof(*regs)) {
			void *reg_offset = regs;
			*(long *)(reg_offset + regno) = data;
		}
		/* Ignore writes to pseudo registers */
	}

	return 0;
}

/*
 * check that an address falls within the bounds of the target process's memory mappings
 */
int
is_user_addr_valid(struct task_struct *child, unsigned long start, unsigned long len)
{
	struct vm_area_struct *vma;
	struct sram_list_struct *sraml;

	/* overflow */
	if (start + len < start)
		return -EIO;

	vma = find_vma(child->mm, start);
	if (vma && start >= vma->vm_start && start + len <= vma->vm_end)
			return 0;

	for (sraml = child->mm->context.sram_list; sraml; sraml = sraml->next)
		if (start >= (unsigned long)sraml->addr
		    && start + len < (unsigned long)sraml->addr + sraml->length)
			return 0;

	if (start >= FIXED_CODE_START && start + len < FIXED_CODE_END)
		return 0;

#ifdef CONFIG_APP_STACK_L1
	if (child->mm->context.l1_stack_save)
		if (start >= (unsigned long)l1_stack_base &&
			start + len < (unsigned long)l1_stack_base + l1_stack_len)
			return 0;
#endif

	return -EIO;
}

/*
 * retrieve the contents of Blackfin userspace general registers
 */
static int genregs_get(struct task_struct *target,
		       const struct user_regset *regset,
		       unsigned int pos, unsigned int count,
		       void *kbuf, void __user *ubuf)
{
	struct pt_regs *regs = task_pt_regs(target);
	int ret;

	/* This sucks ... */
	regs->usp = target->thread.usp;

	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
				  regs, 0, sizeof(*regs));
	if (ret < 0)
		return ret;

	return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
					sizeof(*regs), -1);
}

/*
 * update the contents of the Blackfin userspace general registers
 */
static int genregs_set(struct task_struct *target,
		       const struct user_regset *regset,
		       unsigned int pos, unsigned int count,
		       const void *kbuf, const void __user *ubuf)
{
	struct pt_regs *regs = task_pt_regs(target);
	int ret;

	/* Don't let people set SYSCFG (it's at the end of pt_regs) */
	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
				 regs, 0, PT_SYSCFG);
	if (ret < 0)
		return ret;

	/* This sucks ... */
	target->thread.usp = regs->usp;
	/* regs->retx = regs->pc; */

	return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
					PT_SYSCFG, -1);
}

/*
 * Define the register sets available on the Blackfin under Linux
 */
enum bfin_regset {
	REGSET_GENERAL,
};

static const struct user_regset bfin_regsets[] = {
	[REGSET_GENERAL] = {
		.core_note_type = NT_PRSTATUS,
		.n              = sizeof(struct pt_regs) / sizeof(long),
		.size           = sizeof(long),
		.align          = sizeof(long),
		.get            = genregs_get,
		.set            = genregs_set,
	},
};

static const struct user_regset_view user_bfin_native_view = {
	.name      = "Blackfin",
	.e_machine = EM_BLACKFIN,
	.regsets   = bfin_regsets,
	.n         = ARRAY_SIZE(bfin_regsets),
};

const struct user_regset_view *task_user_regset_view(struct task_struct *task)
{
	return &user_bfin_native_view;
}

void user_enable_single_step(struct task_struct *child)
{
	struct pt_regs *regs = task_pt_regs(child);
	regs->syscfg |= SYSCFG_SSSTEP;

	set_tsk_thread_flag(child, TIF_SINGLESTEP);
}

void user_disable_single_step(struct task_struct *child)
{
	struct pt_regs *regs = task_pt_regs(child);
	regs->syscfg &= ~SYSCFG_SSSTEP;

	clear_tsk_thread_flag(child, TIF_SINGLESTEP);
}

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

	switch (request) {
		/* when I and D space are separate, these will need to be fixed. */
	case PTRACE_PEEKDATA:
		pr_debug("ptrace: PEEKDATA\n");
		/* fall through */
	case PTRACE_PEEKTEXT:	/* read word at location addr. */
		{
			unsigned long tmp = 0;
			int copied = 0, to_copy = sizeof(tmp);

			ret = -EIO;
			pr_debug("ptrace: PEEKTEXT at addr 0x%08lx + %i\n", addr, to_copy);
			if (is_user_addr_valid(child, addr, to_copy) < 0)
				break;
			pr_debug("ptrace: user address is valid\n");

			switch (bfin_mem_access_type(addr, to_copy)) {
			case BFIN_MEM_ACCESS_CORE:
			case BFIN_MEM_ACCESS_CORE_ONLY:
				copied = access_process_vm(child, addr, &tmp,
				                           to_copy, 0);
				if (copied)
					break;

				/* hrm, why didn't that work ... maybe no mapping */
				if (addr >= FIXED_CODE_START &&
				    addr + to_copy <= FIXED_CODE_END) {
					copy_from_user_page(0, 0, 0, &tmp, paddr, to_copy);
					copied = to_copy;
				} else if (addr >= BOOT_ROM_START) {
					memcpy(&tmp, paddr, to_copy);
					copied = to_copy;
				}

				break;
			case BFIN_MEM_ACCESS_DMA:
				if (safe_dma_memcpy(&tmp, paddr, to_copy))
					copied = to_copy;
				break;
			case BFIN_MEM_ACCESS_ITEST:
				if (isram_memcpy(&tmp, paddr, to_copy))
					copied = to_copy;
				break;
			default:
				copied = 0;
				break;
			}

			pr_debug("ptrace: copied size %d [0x%08lx]\n", copied, tmp);
			if (copied == to_copy)
				ret = put_user(tmp, datap);
			break;
		}

		/* when I and D space are separate, this will have to be fixed. */
	case PTRACE_POKEDATA:
		pr_debug("ptrace: PTRACE_PEEKDATA\n");
		/* fall through */
	case PTRACE_POKETEXT:	/* write the word at location addr. */
		{
			int copied = 0, to_copy = sizeof(data);

			ret = -EIO;
			pr_debug("ptrace: POKETEXT at addr 0x%08lx + %i bytes %lx\n",
			         addr, to_copy, data);
			if (is_user_addr_valid(child, addr, to_copy) < 0)
				break;
			pr_debug("ptrace: user address is valid\n");

			switch (bfin_mem_access_type(addr, to_copy)) {
			case BFIN_MEM_ACCESS_CORE:
			case BFIN_MEM_ACCESS_CORE_ONLY:
				copied = access_process_vm(child, addr, &data,
				                           to_copy, 1);
				break;
			case BFIN_MEM_ACCESS_DMA:
				if (safe_dma_memcpy(paddr, &data, to_copy))
					copied = to_copy;
				break;
			case BFIN_MEM_ACCESS_ITEST:
				if (isram_memcpy(paddr, &data, to_copy))
					copied = to_copy;
				break;
			default:
				copied = 0;
				break;
			}

			pr_debug("ptrace: copied size %d\n", copied);
			if (copied == to_copy)
				ret = 0;
			break;
		}

	case PTRACE_PEEKUSR:
		switch (addr) {
#ifdef CONFIG_BINFMT_ELF_FDPIC	/* backwards compat */
		case PT_FDPIC_EXEC:
			request = PTRACE_GETFDPIC;
			addr = PTRACE_GETFDPIC_EXEC;
			goto case_default;
		case PT_FDPIC_INTERP:
			request = PTRACE_GETFDPIC;
			addr = PTRACE_GETFDPIC_INTERP;
			goto case_default;
#endif
		default:
			ret = get_reg(child, addr, datap);
		}
		pr_debug("ptrace: PEEKUSR reg %li with %#lx = %i\n", addr, data, ret);
		break;

	case PTRACE_POKEUSR:
		ret = put_reg(child, addr, data);
		pr_debug("ptrace: POKEUSR reg %li with %li = %i\n", addr, data, ret);
		break;

	case PTRACE_GETREGS:
		pr_debug("ptrace: PTRACE_GETREGS\n");
		return copy_regset_to_user(child, &user_bfin_native_view,
					   REGSET_GENERAL,
					   0, sizeof(struct pt_regs),
					   (void __user *)data);

	case PTRACE_SETREGS:
		pr_debug("ptrace: PTRACE_SETREGS\n");
		return copy_regset_from_user(child, &user_bfin_native_view,
					     REGSET_GENERAL,
					     0, sizeof(struct pt_regs),
					     (const void __user *)data);

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

	return ret;
}

asmlinkage int syscall_trace_enter(struct pt_regs *regs)
{
	int ret = 0;

	if (test_thread_flag(TIF_SYSCALL_TRACE))
		ret = tracehook_report_syscall_entry(regs);

	return ret;
}

asmlinkage void syscall_trace_leave(struct pt_regs *regs)
{
	int step;

	step = test_thread_flag(TIF_SINGLESTEP);
	if (step || test_thread_flag(TIF_SYSCALL_TRACE))
		tracehook_report_syscall_exit(regs, step);
}
Commit	Line	Data
1394f032	1	/*
96f1050d	2	* linux/kernel/ptrace.c is by Ross Biro 1/23/92, edited by Linus Torvalds
e8f263df	3	* these modifications are Copyright 2004-2010 Analog Devices Inc.
1394f032	4	*
96f1050d	5	* Licensed under the GPL-2
1394f032 BW	6	*/
	7
	8	#include <linux/kernel.h>
	9	#include <linux/sched.h>
	10	#include <linux/mm.h>
	11	#include <linux/smp.h>
e50e2f25	12	#include <linux/elf.h>
1394f032 BW	13	#include <linux/errno.h>
	14	#include <linux/ptrace.h>
	15	#include <linux/user.h>
e50e2f25	16	#include <linux/regset.h>
1394f032	17	#include <linux/signal.h>
e8f263df	18	#include <linux/tracehook.h>
1f83b8f1	19	#include <linux/uaccess.h>
1394f032	20
1394f032 BW	21	#include <asm/page.h>
	22	#include <asm/pgtable.h>
	23	#include <asm/system.h>
	24	#include <asm/processor.h>
	25	#include <asm/asm-offsets.h>
	26	#include <asm/dma.h>
26156397	27	#include <asm/fixed_code.h>
7786ce82	28	#include <asm/cacheflush.h>
dbc895f9	29	#include <asm/mem_map.h>
175671e7	30	#include <asm/mmu_context.h>
1394f032	31
1394f032 BW	32	/*
	33	* does not yet catch signals sent when the child dies.
	34	* in exit.c or in signal.c.
	35	*/
	36
1394f032 BW	37	/*
	38	* Get contents of register REGNO in task TASK.
	39	*/
f2ce4802 MF	40	static inline long
f2ce4802 MF	41	get_reg(struct task_struct task, long regno, unsigned long __user datap)
1394f032	42	{
f2ce4802 MF	43	long tmp;
f2ce4802 MF	44	struct pt_regs *regs = task_pt_regs(task);
1394f032	45
f2ce4802 MF	46	if (regno & 3 \|\| regno > PT_LAST_PSEUDO \|\| regno < 0)
f2ce4802 MF	47	return -EIO;
1394f032 BW	48
1394f032 BW	49	switch (regno) {
f2ce4802 MF	50	case PT_TEXT_ADDR:
	51	tmp = task->mm->start_code;
	52	break;
	53	case PT_TEXT_END_ADDR:
	54	tmp = task->mm->end_code;
	55	break;
	56	case PT_DATA_ADDR:
	57	tmp = task->mm->start_data;
	58	break;
1394f032	59	case PT_USP:
f2ce4802 MF	60	tmp = task->thread.usp;
f2ce4802 MF	61	break;
1394f032	62	default:
f2ce4802 MF	63	if (regno < sizeof(*regs)) {
	64	void *reg_ptr = regs;
	65	tmp = (long )(reg_ptr + regno);
	66	} else
	67	return -EIO;
1394f032	68	}
1394f032	69
f2ce4802	70	return put_user(tmp, datap);
1394f032 BW	71	}
	72
	73	/*
	74	* Write contents of register REGNO in task TASK.
	75	*/
	76	static inline int
f2ce4802	77	put_reg(struct task_struct *task, long regno, unsigned long data)
1394f032	78	{
f2ce4802	79	struct pt_regs *regs = task_pt_regs(task);
1394f032	80
f2ce4802 MF	81	if (regno & 3 \|\| regno > PT_LAST_PSEUDO \|\| regno < 0)
f2ce4802 MF	82	return -EIO;
1394f032 BW	83
	84	switch (regno) {
	85	case PT_PC:
	86	/*********************************************************************/
	87	/* At this point the kernel is most likely in exception. */
	88	/* The RETX register will be used to populate the pc of the process. */
	89	/*********************************************************************/
	90	regs->retx = data;
	91	regs->pc = data;
	92	break;
	93	case PT_RETX:
	94	break; /* regs->retx = data; break; */
	95	case PT_USP:
	96	regs->usp = data;
	97	task->thread.usp = data;
	98	break;
f2ce4802 MF	99	case PT_SYSCFG: /* don't let userspace screw with this */
	100	if ((data & ~1) != 0x6)
	101	pr_warning("ptrace: ignore syscfg write of %#lx\n", data);
	102	break; /* regs->syscfg = data; break; */
1394f032	103	default:
f2ce4802 MF	104	if (regno < sizeof(*regs)) {
	105	void *reg_offset = regs;
	106	(long )(reg_offset + regno) = data;
	107	}
	108	/* Ignore writes to pseudo registers */
1394f032	109	}
f2ce4802	110
1394f032 BW	111	return 0;
	112	}
	113
	114	/*
	115	* check that an address falls within the bounds of the target process's memory mappings
	116	*/
99a5b287 SZ	117	int
99a5b287 SZ	118	is_user_addr_valid(struct task_struct *child, unsigned long start, unsigned long len)
1394f032	119	{
8feae131	120	struct vm_area_struct *vma;
1394f032 BW	121	struct sram_list_struct *sraml;
1394f032 BW	122
3c08f1d1 MF	123	/* overflow */
	124	if (start + len < start)
	125	return -EIO;
	126
8feae131 DH	127	vma = find_vma(child->mm, start);
8feae131 DH	128	if (vma && start >= vma->vm_start && start + len <= vma->vm_end)
1394f032 BW	129	return 0;
	130
	131	for (sraml = child->mm->context.sram_list; sraml; sraml = sraml->next)
	132	if (start >= (unsigned long)sraml->addr
d207a8c7	133	&& start + len < (unsigned long)sraml->addr + sraml->length)
1394f032 BW	134	return 0;
1394f032 BW	135
d207a8c7	136	if (start >= FIXED_CODE_START && start + len < FIXED_CODE_END)
26156397 JZ	137	return 0;
26156397 JZ	138
175671e7 BS	139	#ifdef CONFIG_APP_STACK_L1
	140	if (child->mm->context.l1_stack_save)
	141	if (start >= (unsigned long)l1_stack_base &&
	142	start + len < (unsigned long)l1_stack_base + l1_stack_len)
	143	return 0;
	144	#endif
	145
1394f032 BW	146	return -EIO;
	147	}
	148
e50e2f25 MF	149	/*
	150	* retrieve the contents of Blackfin userspace general registers
	151	*/
	152	static int genregs_get(struct task_struct *target,
	153	const struct user_regset *regset,
	154	unsigned int pos, unsigned int count,
	155	void kbuf, void __user ubuf)
	156	{
	157	struct pt_regs *regs = task_pt_regs(target);
	158	int ret;
	159
	160	/* This sucks ... */
	161	regs->usp = target->thread.usp;
	162
	163	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
	164	regs, 0, sizeof(*regs));
	165	if (ret < 0)
	166	return ret;
	167
	168	return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
	169	sizeof(*regs), -1);
	170	}
	171
	172	/*
	173	* update the contents of the Blackfin userspace general registers
	174	*/
	175	static int genregs_set(struct task_struct *target,
	176	const struct user_regset *regset,
	177	unsigned int pos, unsigned int count,
	178	const void kbuf, const void __user ubuf)
	179	{
	180	struct pt_regs *regs = task_pt_regs(target);
	181	int ret;
	182
	183	/* Don't let people set SYSCFG (it's at the end of pt_regs) */
	184	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
	185	regs, 0, PT_SYSCFG);
	186	if (ret < 0)
	187	return ret;
	188
	189	/* This sucks ... */
	190	target->thread.usp = regs->usp;
	191	/* regs->retx = regs->pc; */
	192
	193	return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
	194	PT_SYSCFG, -1);
	195	}
	196
	197	/*
	198	* Define the register sets available on the Blackfin under Linux
	199	*/
	200	enum bfin_regset {
	201	REGSET_GENERAL,
	202	};
	203
	204	static const struct user_regset bfin_regsets[] = {
	205	[REGSET_GENERAL] = {
	206	.core_note_type = NT_PRSTATUS,
	207	.n = sizeof(struct pt_regs) / sizeof(long),
	208	.size = sizeof(long),
	209	.align = sizeof(long),
	210	.get = genregs_get,
	211	.set = genregs_set,
	212	},
213	};
214
215	static const struct user_regset_view user_bfin_native_view = {
216	.name = "Blackfin",
217	.e_machine = EM_BLACKFIN,
218	.regsets = bfin_regsets,
219	.n = ARRAY_SIZE(bfin_regsets),
220	};
221
222	const struct user_regset_view task_user_regset_view(struct task_struct task)
223	{
224	return &user_bfin_native_view;
225	}
226
e8f263df	227	void user_enable_single_step(struct task_struct *child)
cb4c173d	228	{
5f09c77d MF	229	struct pt_regs *regs = task_pt_regs(child);
5f09c77d MF	230	regs->syscfg \|= SYSCFG_SSSTEP;
600482c1 MF	231
600482c1 MF	232	set_tsk_thread_flag(child, TIF_SINGLESTEP);
cb4c173d MF	233	}
cb4c173d MF	234
e8f263df	235	void user_disable_single_step(struct task_struct *child)
1394f032	236	{
5f09c77d MF	237	struct pt_regs *regs = task_pt_regs(child);
5f09c77d MF	238	regs->syscfg &= ~SYSCFG_SSSTEP;
600482c1 MF	239
600482c1 MF	240	clear_tsk_thread_flag(child, TIF_SINGLESTEP);
1394f032 BW	241	}
1394f032 BW	242
9b05a69e NK	243	long arch_ptrace(struct task_struct *child, long request,
9b05a69e NK	244	unsigned long addr, unsigned long data)
1394f032 BW	245	{
1394f032 BW	246	int ret;
0ddeeca2	247	unsigned long __user datap = (unsigned long __user )data;
c014e15a	248	void paddr = (void )addr;
1394f032 BW	249
	250	switch (request) {
	251	/* when I and D space are separate, these will need to be fixed. */
	252	case PTRACE_PEEKDATA:
	253	pr_debug("ptrace: PEEKDATA\n");
1394f032 BW	254	/* fall through */
	255	case PTRACE_PEEKTEXT: /* read word at location addr. */
	256	{
	257	unsigned long tmp = 0;
c014e15a	258	int copied = 0, to_copy = sizeof(tmp);
1394f032 BW	259
1394f032 BW	260	ret = -EIO;
c014e15a MF	261	pr_debug("ptrace: PEEKTEXT at addr 0x%08lx + %i\n", addr, to_copy);
c014e15a MF	262	if (is_user_addr_valid(child, addr, to_copy) < 0)
1394f032 BW	263	break;
	264	pr_debug("ptrace: user address is valid\n");
	265
c014e15a MF	266	switch (bfin_mem_access_type(addr, to_copy)) {
	267	case BFIN_MEM_ACCESS_CORE:
	268	case BFIN_MEM_ACCESS_CORE_ONLY:
dabaad5b	269	copied = access_process_vm(child, addr, &tmp,
c014e15a MF	270	to_copy, 0);
	271	if (copied)
	272	break;
	273
	274	/* hrm, why didn't that work ... maybe no mapping */
	275	if (addr >= FIXED_CODE_START &&
	276	addr + to_copy <= FIXED_CODE_END) {
	277	copy_from_user_page(0, 0, 0, &tmp, paddr, to_copy);
	278	copied = to_copy;
	279	} else if (addr >= BOOT_ROM_START) {
	280	memcpy(&tmp, paddr, to_copy);
	281	copied = to_copy;
	282	}
d207a8c7	283
1394f032	284	break;
c014e15a MF	285	case BFIN_MEM_ACCESS_DMA:
	286	if (safe_dma_memcpy(&tmp, paddr, to_copy))
	287	copied = to_copy;
	288	break;
	289	case BFIN_MEM_ACCESS_ITEST:
	290	if (isram_memcpy(&tmp, paddr, to_copy))
	291	copied = to_copy;
	292	break;
	293	default:
	294	copied = 0;
	295	break;
	296	}
	297
	298	pr_debug("ptrace: copied size %d [0x%08lx]\n", copied, tmp);
	299	if (copied == to_copy)
	300	ret = put_user(tmp, datap);
1394f032 BW	301	break;
	302	}
	303
1394f032 BW	304	/* when I and D space are separate, this will have to be fixed. */
1394f032 BW	305	case PTRACE_POKEDATA:
d3ab3a62	306	pr_debug("ptrace: PTRACE_PEEKDATA\n");
1394f032 BW	307	/* fall through */
	308	case PTRACE_POKETEXT: /* write the word at location addr. */
	309	{
c014e15a	310	int copied = 0, to_copy = sizeof(data);
1394f032 BW	311
1394f032 BW	312	ret = -EIO;
c014e15a MF	313	pr_debug("ptrace: POKETEXT at addr 0x%08lx + %i bytes %lx\n",
	314	addr, to_copy, data);
	315	if (is_user_addr_valid(child, addr, to_copy) < 0)
1394f032 BW	316	break;
	317	pr_debug("ptrace: user address is valid\n");
	318
c014e15a MF	319	switch (bfin_mem_access_type(addr, to_copy)) {
	320	case BFIN_MEM_ACCESS_CORE:
	321	case BFIN_MEM_ACCESS_CORE_ONLY:
dabaad5b	322	copied = access_process_vm(child, addr, &data,
46b60faf	323	to_copy, 1);
1394f032	324	break;
c014e15a MF	325	case BFIN_MEM_ACCESS_DMA:
	326	if (safe_dma_memcpy(paddr, &data, to_copy))
	327	copied = to_copy;
	328	break;
	329	case BFIN_MEM_ACCESS_ITEST:
	330	if (isram_memcpy(paddr, &data, to_copy))
	331	copied = to_copy;
	332	break;
	333	default:
	334	copied = 0;
	335	break;
	336	}
	337
	338	pr_debug("ptrace: copied size %d\n", copied);
	339	if (copied == to_copy)
	340	ret = 0;
1394f032 BW	341	break;
	342	}
	343
f2ce4802 MF	344	case PTRACE_PEEKUSR:
	345	switch (addr) {
	346	#ifdef CONFIG_BINFMT_ELF_FDPIC /* backwards compat */
9c1a1259 MF	347	case PT_FDPIC_EXEC:
	348	request = PTRACE_GETFDPIC;
	349	addr = PTRACE_GETFDPIC_EXEC;
	350	goto case_default;
	351	case PT_FDPIC_INTERP:
	352	request = PTRACE_GETFDPIC;
	353	addr = PTRACE_GETFDPIC_INTERP;
	354	goto case_default;
f2ce4802 MF	355	#endif
	356	default:
	357	ret = get_reg(child, addr, datap);
1394f032	358	}
f2ce4802 MF	359	pr_debug("ptrace: PEEKUSR reg %li with %#lx = %i\n", addr, data, ret);
f2ce4802 MF	360	break;
1394f032	361
f2ce4802	362	case PTRACE_POKEUSR:
1394f032	363	ret = put_reg(child, addr, data);
f2ce4802	364	pr_debug("ptrace: POKEUSR reg %li with %li = %i\n", addr, data, ret);
1394f032 BW	365	break;
1394f032 BW	366
1394f032	367	case PTRACE_GETREGS:
e50e2f25 MF	368	pr_debug("ptrace: PTRACE_GETREGS\n");
	369	return copy_regset_to_user(child, &user_bfin_native_view,
	370	REGSET_GENERAL,
	371	0, sizeof(struct pt_regs),
	372	(void __user *)data);
1394f032 BW	373
1394f032 BW	374	case PTRACE_SETREGS:
e50e2f25 MF	375	pr_debug("ptrace: PTRACE_SETREGS\n");
	376	return copy_regset_from_user(child, &user_bfin_native_view,
	377	REGSET_GENERAL,
	378	0, sizeof(struct pt_regs),
	379	(const void __user *)data);
d3ab3a62	380
9c1a1259	381	case_default:
1394f032 BW	382	default:
	383	ret = ptrace_request(child, request, addr, data);
	384	break;
	385	}
	386
	387	return ret;
	388	}
	389
e8f263df	390	asmlinkage int syscall_trace_enter(struct pt_regs *regs)
1394f032	391	{
e8f263df MF	392	int ret = 0;
	393
	394	if (test_thread_flag(TIF_SYSCALL_TRACE))
	395	ret = tracehook_report_syscall_entry(regs);
	396
	397	return ret;
	398	}
	399
	400	asmlinkage void syscall_trace_leave(struct pt_regs *regs)
	401	{
600482c1 MF	402	int step;
	403
	404	step = test_thread_flag(TIF_SINGLESTEP);
	405	if (step \|\| test_thread_flag(TIF_SYSCALL_TRACE))
	406	tracehook_report_syscall_exit(regs, step);
1394f032	407	}