[thirdparty/linux.git] / arch / arc / kernel / ptrace.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
 */

#include <linux/ptrace.h>
#include <linux/tracehook.h>
#include <linux/sched/task_stack.h>
#include <linux/regset.h>
#include <linux/unistd.h>
#include <linux/elf.h>

static struct callee_regs *task_callee_regs(struct task_struct *tsk)
{
	struct callee_regs *tmp = (struct callee_regs *)tsk->thread.callee_reg;
	return tmp;
}

static int genregs_get(struct task_struct *target,
		       const struct user_regset *regset,
		       unsigned int pos, unsigned int count,
		       void *kbuf, void __user *ubuf)
{
	const struct pt_regs *ptregs = task_pt_regs(target);
	const struct callee_regs *cregs = task_callee_regs(target);
	int ret = 0;
	unsigned int stop_pc_val;

#define REG_O_CHUNK(START, END, PTR)	\
	if (!ret)	\
		ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, PTR, \
			offsetof(struct user_regs_struct, START), \
			offsetof(struct user_regs_struct, END));

#define REG_O_ONE(LOC, PTR)	\
	if (!ret)		\
		ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, PTR, \
			offsetof(struct user_regs_struct, LOC), \
			offsetof(struct user_regs_struct, LOC) + 4);

#define REG_O_ZERO(LOC)		\
	if (!ret)		\
		ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, \
			offsetof(struct user_regs_struct, LOC), \
			offsetof(struct user_regs_struct, LOC) + 4);

	REG_O_ZERO(pad);
	REG_O_ONE(scratch.bta, &ptregs->bta);
	REG_O_ONE(scratch.lp_start, &ptregs->lp_start);
	REG_O_ONE(scratch.lp_end, &ptregs->lp_end);
	REG_O_ONE(scratch.lp_count, &ptregs->lp_count);
	REG_O_ONE(scratch.status32, &ptregs->status32);
	REG_O_ONE(scratch.ret, &ptregs->ret);
	REG_O_ONE(scratch.blink, &ptregs->blink);
	REG_O_ONE(scratch.fp, &ptregs->fp);
	REG_O_ONE(scratch.gp, &ptregs->r26);
	REG_O_ONE(scratch.r12, &ptregs->r12);
	REG_O_ONE(scratch.r11, &ptregs->r11);
	REG_O_ONE(scratch.r10, &ptregs->r10);
	REG_O_ONE(scratch.r9, &ptregs->r9);
	REG_O_ONE(scratch.r8, &ptregs->r8);
	REG_O_ONE(scratch.r7, &ptregs->r7);
	REG_O_ONE(scratch.r6, &ptregs->r6);
	REG_O_ONE(scratch.r5, &ptregs->r5);
	REG_O_ONE(scratch.r4, &ptregs->r4);
	REG_O_ONE(scratch.r3, &ptregs->r3);
	REG_O_ONE(scratch.r2, &ptregs->r2);
	REG_O_ONE(scratch.r1, &ptregs->r1);
	REG_O_ONE(scratch.r0, &ptregs->r0);
	REG_O_ONE(scratch.sp, &ptregs->sp);

	REG_O_ZERO(pad2);

	REG_O_ONE(callee.r25, &cregs->r25);
	REG_O_ONE(callee.r24, &cregs->r24);
	REG_O_ONE(callee.r23, &cregs->r23);
	REG_O_ONE(callee.r22, &cregs->r22);
	REG_O_ONE(callee.r21, &cregs->r21);
	REG_O_ONE(callee.r20, &cregs->r20);
	REG_O_ONE(callee.r19, &cregs->r19);
	REG_O_ONE(callee.r18, &cregs->r18);
	REG_O_ONE(callee.r17, &cregs->r17);
	REG_O_ONE(callee.r16, &cregs->r16);
	REG_O_ONE(callee.r15, &cregs->r15);
	REG_O_ONE(callee.r14, &cregs->r14);
	REG_O_ONE(callee.r13, &cregs->r13);

	REG_O_ONE(efa, &target->thread.fault_address);

	if (!ret) {
		if (in_brkpt_trap(ptregs)) {
			stop_pc_val = target->thread.fault_address;
			pr_debug("\t\tstop_pc (brk-pt)\n");
		} else {
			stop_pc_val = ptregs->ret;
			pr_debug("\t\tstop_pc (others)\n");
		}

		REG_O_ONE(stop_pc, &stop_pc_val);
	}

	return ret;
}

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)
{
	const struct pt_regs *ptregs = task_pt_regs(target);
	const struct callee_regs *cregs = task_callee_regs(target);
	int ret = 0;

#define REG_IN_CHUNK(FIRST, NEXT, PTR)	\
	if (!ret)			\
		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, \
			(void *)(PTR), \
			offsetof(struct user_regs_struct, FIRST), \
			offsetof(struct user_regs_struct, NEXT));

#define REG_IN_ONE(LOC, PTR)		\
	if (!ret)			\
		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, \
			(void *)(PTR), \
			offsetof(struct user_regs_struct, LOC), \
			offsetof(struct user_regs_struct, LOC) + 4);

#define REG_IGNORE_ONE(LOC)		\
	if (!ret)			\
		ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, \
			offsetof(struct user_regs_struct, LOC), \
			offsetof(struct user_regs_struct, LOC) + 4);

	REG_IGNORE_ONE(pad);

	REG_IN_ONE(scratch.bta, &ptregs->bta);
	REG_IN_ONE(scratch.lp_start, &ptregs->lp_start);
	REG_IN_ONE(scratch.lp_end, &ptregs->lp_end);
	REG_IN_ONE(scratch.lp_count, &ptregs->lp_count);

	REG_IGNORE_ONE(scratch.status32);

	REG_IN_ONE(scratch.ret, &ptregs->ret);
	REG_IN_ONE(scratch.blink, &ptregs->blink);
	REG_IN_ONE(scratch.fp, &ptregs->fp);
	REG_IN_ONE(scratch.gp, &ptregs->r26);
	REG_IN_ONE(scratch.r12, &ptregs->r12);
	REG_IN_ONE(scratch.r11, &ptregs->r11);
	REG_IN_ONE(scratch.r10, &ptregs->r10);
	REG_IN_ONE(scratch.r9, &ptregs->r9);
	REG_IN_ONE(scratch.r8, &ptregs->r8);
	REG_IN_ONE(scratch.r7, &ptregs->r7);
	REG_IN_ONE(scratch.r6, &ptregs->r6);
	REG_IN_ONE(scratch.r5, &ptregs->r5);
	REG_IN_ONE(scratch.r4, &ptregs->r4);
	REG_IN_ONE(scratch.r3, &ptregs->r3);
	REG_IN_ONE(scratch.r2, &ptregs->r2);
	REG_IN_ONE(scratch.r1, &ptregs->r1);
	REG_IN_ONE(scratch.r0, &ptregs->r0);
	REG_IN_ONE(scratch.sp, &ptregs->sp);

	REG_IGNORE_ONE(pad2);

	REG_IN_ONE(callee.r25, &cregs->r25);
	REG_IN_ONE(callee.r24, &cregs->r24);
	REG_IN_ONE(callee.r23, &cregs->r23);
	REG_IN_ONE(callee.r22, &cregs->r22);
	REG_IN_ONE(callee.r21, &cregs->r21);
	REG_IN_ONE(callee.r20, &cregs->r20);
	REG_IN_ONE(callee.r19, &cregs->r19);
	REG_IN_ONE(callee.r18, &cregs->r18);
	REG_IN_ONE(callee.r17, &cregs->r17);
	REG_IN_ONE(callee.r16, &cregs->r16);
	REG_IN_ONE(callee.r15, &cregs->r15);
	REG_IN_ONE(callee.r14, &cregs->r14);
	REG_IN_ONE(callee.r13, &cregs->r13);

	REG_IGNORE_ONE(efa);			/* efa update invalid */
	REG_IGNORE_ONE(stop_pc);		/* PC updated via @ret */

	return ret;
}

#ifdef CONFIG_ISA_ARCV2
static int arcv2regs_get(struct task_struct *target,
		       const struct user_regset *regset,
		       unsigned int pos, unsigned int count,
		       void *kbuf, void __user *ubuf)
{
	const struct pt_regs *regs = task_pt_regs(target);
	int ret, copy_sz;

	if (IS_ENABLED(CONFIG_ARC_HAS_ACCL_REGS))
		copy_sz = sizeof(struct user_regs_arcv2);
	else
		copy_sz = 4;	/* r30 only */

	/*
	 * itemized copy not needed like above as layout of regs (r30,r58,r59)
	 * is exactly same in kernel (pt_regs) and userspace (user_regs_arcv2)
	 */
	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &regs->r30,
				  0, copy_sz);

	return ret;
}

static int arcv2regs_set(struct task_struct *target,
		       const struct user_regset *regset,
		       unsigned int pos, unsigned int count,
		       const void *kbuf, const void __user *ubuf)
{
	const struct pt_regs *regs = task_pt_regs(target);
	int ret, copy_sz;

	if (IS_ENABLED(CONFIG_ARC_HAS_ACCL_REGS))
		copy_sz = sizeof(struct user_regs_arcv2);
	else
		copy_sz = 4;	/* r30 only */

	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, (void *)&regs->r30,
				  0, copy_sz);

	return ret;
}

#endif

enum arc_getset {
	REGSET_CMN,
	REGSET_ARCV2,
};

static const struct user_regset arc_regsets[] = {
	[REGSET_CMN] = {
	       .core_note_type = NT_PRSTATUS,
	       .n = ELF_NGREG,
	       .size = sizeof(unsigned long),
	       .align = sizeof(unsigned long),
	       .get = genregs_get,
	       .set = genregs_set,
	},
#ifdef CONFIG_ISA_ARCV2
	[REGSET_ARCV2] = {
	       .core_note_type = NT_ARC_V2,
	       .n = ELF_ARCV2REG,
	       .size = sizeof(unsigned long),
	       .align = sizeof(unsigned long),
	       .get = arcv2regs_get,
	       .set = arcv2regs_set,
	},
#endif
};

static const struct user_regset_view user_arc_view = {
	.name		= "arc",
	.e_machine	= EM_ARC_INUSE,
	.regsets	= arc_regsets,
	.n		= ARRAY_SIZE(arc_regsets)
};

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

void ptrace_disable(struct task_struct *child)
{
}

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

	pr_debug("REQ=%ld: ADDR =0x%lx, DATA=0x%lx)\n", request, addr, data);

	switch (request) {
	case PTRACE_GET_THREAD_AREA:
		ret = put_user(task_thread_info(child)->thr_ptr,
			       (unsigned long __user *)data);
		break;
	default:
		ret = ptrace_request(child, request, addr, data);
		break;
	}

	return ret;
}

asmlinkage int syscall_trace_entry(struct pt_regs *regs)
{
	if (tracehook_report_syscall_entry(regs))
		return ULONG_MAX;

	return regs->r8;
}

asmlinkage void syscall_trace_exit(struct pt_regs *regs)
{
	tracehook_report_syscall_exit(regs, 0);
}
Commit	Line	Data
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
c08098f2 VG	2	/*
c08098f2 VG	3	* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
c08098f2 VG	4	*/
	5
	6	#include <linux/ptrace.h>
547f1125	7	#include <linux/tracehook.h>
68db0cf1	8	#include <linux/sched/task_stack.h>
547f1125 VG	9	#include <linux/regset.h>
	10	#include <linux/unistd.h>
	11	#include <linux/elf.h>
	12
	13	static struct callee_regs task_callee_regs(struct task_struct tsk)
	14	{
	15	struct callee_regs tmp = (struct callee_regs )tsk->thread.callee_reg;
	16	return tmp;
	17	}
	18
	19	static int genregs_get(struct task_struct *target,
	20	const struct user_regset *regset,
	21	unsigned int pos, unsigned int count,
	22	void kbuf, void __user ubuf)
	23	{
	24	const struct pt_regs *ptregs = task_pt_regs(target);
	25	const struct callee_regs *cregs = task_callee_regs(target);
	26	int ret = 0;
	27	unsigned int stop_pc_val;
	28
	29	#define REG_O_CHUNK(START, END, PTR) \
	30	if (!ret) \
	31	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, PTR, \
	32	offsetof(struct user_regs_struct, START), \
	33	offsetof(struct user_regs_struct, END));
	34
	35	#define REG_O_ONE(LOC, PTR) \
	36	if (!ret) \
	37	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, PTR, \
	38	offsetof(struct user_regs_struct, LOC), \
	39	offsetof(struct user_regs_struct, LOC) + 4);
	40
2fa91904 VG	41	#define REG_O_ZERO(LOC) \
	42	if (!ret) \
	43	ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, \
	44	offsetof(struct user_regs_struct, LOC), \
	45	offsetof(struct user_regs_struct, LOC) + 4);
	46
	47	REG_O_ZERO(pad);
6ffb9c8c VG	48	REG_O_ONE(scratch.bta, &ptregs->bta);
	49	REG_O_ONE(scratch.lp_start, &ptregs->lp_start);
	50	REG_O_ONE(scratch.lp_end, &ptregs->lp_end);
	51	REG_O_ONE(scratch.lp_count, &ptregs->lp_count);
	52	REG_O_ONE(scratch.status32, &ptregs->status32);
	53	REG_O_ONE(scratch.ret, &ptregs->ret);
	54	REG_O_ONE(scratch.blink, &ptregs->blink);
	55	REG_O_ONE(scratch.fp, &ptregs->fp);
	56	REG_O_ONE(scratch.gp, &ptregs->r26);
	57	REG_O_ONE(scratch.r12, &ptregs->r12);
	58	REG_O_ONE(scratch.r11, &ptregs->r11);
	59	REG_O_ONE(scratch.r10, &ptregs->r10);
	60	REG_O_ONE(scratch.r9, &ptregs->r9);
	61	REG_O_ONE(scratch.r8, &ptregs->r8);
	62	REG_O_ONE(scratch.r7, &ptregs->r7);
	63	REG_O_ONE(scratch.r6, &ptregs->r6);
	64	REG_O_ONE(scratch.r5, &ptregs->r5);
	65	REG_O_ONE(scratch.r4, &ptregs->r4);
	66	REG_O_ONE(scratch.r3, &ptregs->r3);
	67	REG_O_ONE(scratch.r2, &ptregs->r2);
	68	REG_O_ONE(scratch.r1, &ptregs->r1);
	69	REG_O_ONE(scratch.r0, &ptregs->r0);
	70	REG_O_ONE(scratch.sp, &ptregs->sp);
	71
16f9afe6	72	REG_O_ZERO(pad2);
6ffb9c8c VG	73
	74	REG_O_ONE(callee.r25, &cregs->r25);
	75	REG_O_ONE(callee.r24, &cregs->r24);
	76	REG_O_ONE(callee.r23, &cregs->r23);
	77	REG_O_ONE(callee.r22, &cregs->r22);
	78	REG_O_ONE(callee.r21, &cregs->r21);
	79	REG_O_ONE(callee.r20, &cregs->r20);
	80	REG_O_ONE(callee.r19, &cregs->r19);
	81	REG_O_ONE(callee.r18, &cregs->r18);
	82	REG_O_ONE(callee.r17, &cregs->r17);
	83	REG_O_ONE(callee.r16, &cregs->r16);
	84	REG_O_ONE(callee.r15, &cregs->r15);
	85	REG_O_ONE(callee.r14, &cregs->r14);
	86	REG_O_ONE(callee.r13, &cregs->r13);
	87
	88	REG_O_ONE(efa, &target->thread.fault_address);
547f1125 VG	89
	90	if (!ret) {
	91	if (in_brkpt_trap(ptregs)) {
	92	stop_pc_val = target->thread.fault_address;
	93	pr_debug("\t\tstop_pc (brk-pt)\n");
	94	} else {
	95	stop_pc_val = ptregs->ret;
	96	pr_debug("\t\tstop_pc (others)\n");
	97	}
	98
	99	REG_O_ONE(stop_pc, &stop_pc_val);
	100	}
	101
	102	return ret;
	103	}
	104
	105	static int genregs_set(struct task_struct *target,
	106	const struct user_regset *regset,
	107	unsigned int pos, unsigned int count,
	108	const void kbuf, const void __user ubuf)
	109	{
	110	const struct pt_regs *ptregs = task_pt_regs(target);
	111	const struct callee_regs *cregs = task_callee_regs(target);
	112	int ret = 0;
	113
	114	#define REG_IN_CHUNK(FIRST, NEXT, PTR) \
	115	if (!ret) \
	116	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, \
	117	(void *)(PTR), \
	118	offsetof(struct user_regs_struct, FIRST), \
	119	offsetof(struct user_regs_struct, NEXT));
	120
	121	#define REG_IN_ONE(LOC, PTR) \
	122	if (!ret) \
	123	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, \
	124	(void *)(PTR), \
	125	offsetof(struct user_regs_struct, LOC), \
	126	offsetof(struct user_regs_struct, LOC) + 4);
	127
	128	#define REG_IGNORE_ONE(LOC) \
	129	if (!ret) \
	130	ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, \
	131	offsetof(struct user_regs_struct, LOC), \
	132	offsetof(struct user_regs_struct, LOC) + 4);
	133
2fa91904	134	REG_IGNORE_ONE(pad);
6ffb9c8c VG	135
	136	REG_IN_ONE(scratch.bta, &ptregs->bta);
	137	REG_IN_ONE(scratch.lp_start, &ptregs->lp_start);
	138	REG_IN_ONE(scratch.lp_end, &ptregs->lp_end);
	139	REG_IN_ONE(scratch.lp_count, &ptregs->lp_count);
	140
	141	REG_IGNORE_ONE(scratch.status32);
	142
	143	REG_IN_ONE(scratch.ret, &ptregs->ret);
	144	REG_IN_ONE(scratch.blink, &ptregs->blink);
	145	REG_IN_ONE(scratch.fp, &ptregs->fp);
	146	REG_IN_ONE(scratch.gp, &ptregs->r26);
	147	REG_IN_ONE(scratch.r12, &ptregs->r12);
	148	REG_IN_ONE(scratch.r11, &ptregs->r11);
	149	REG_IN_ONE(scratch.r10, &ptregs->r10);
	150	REG_IN_ONE(scratch.r9, &ptregs->r9);
	151	REG_IN_ONE(scratch.r8, &ptregs->r8);
	152	REG_IN_ONE(scratch.r7, &ptregs->r7);
	153	REG_IN_ONE(scratch.r6, &ptregs->r6);
	154	REG_IN_ONE(scratch.r5, &ptregs->r5);
	155	REG_IN_ONE(scratch.r4, &ptregs->r4);
	156	REG_IN_ONE(scratch.r3, &ptregs->r3);
	157	REG_IN_ONE(scratch.r2, &ptregs->r2);
	158	REG_IN_ONE(scratch.r1, &ptregs->r1);
	159	REG_IN_ONE(scratch.r0, &ptregs->r0);
	160	REG_IN_ONE(scratch.sp, &ptregs->sp);
	161
16f9afe6	162	REG_IGNORE_ONE(pad2);
6ffb9c8c VG	163
	164	REG_IN_ONE(callee.r25, &cregs->r25);
	165	REG_IN_ONE(callee.r24, &cregs->r24);
	166	REG_IN_ONE(callee.r23, &cregs->r23);
	167	REG_IN_ONE(callee.r22, &cregs->r22);
	168	REG_IN_ONE(callee.r21, &cregs->r21);
	169	REG_IN_ONE(callee.r20, &cregs->r20);
	170	REG_IN_ONE(callee.r19, &cregs->r19);
	171	REG_IN_ONE(callee.r18, &cregs->r18);
	172	REG_IN_ONE(callee.r17, &cregs->r17);
	173	REG_IN_ONE(callee.r16, &cregs->r16);
	174	REG_IN_ONE(callee.r15, &cregs->r15);
	175	REG_IN_ONE(callee.r14, &cregs->r14);
	176	REG_IN_ONE(callee.r13, &cregs->r13);
	177
547f1125	178	REG_IGNORE_ONE(efa); /* efa update invalid */
6ffb9c8c	179	REG_IGNORE_ONE(stop_pc); /* PC updated via @ret */
547f1125 VG	180
	181	return ret;
	182	}
	183
65c02a55 VG	184	#ifdef CONFIG_ISA_ARCV2
	185	static int arcv2regs_get(struct task_struct *target,
	186	const struct user_regset *regset,
	187	unsigned int pos, unsigned int count,
	188	void kbuf, void __user ubuf)
	189	{
	190	const struct pt_regs *regs = task_pt_regs(target);
	191	int ret, copy_sz;
	192
	193	if (IS_ENABLED(CONFIG_ARC_HAS_ACCL_REGS))
	194	copy_sz = sizeof(struct user_regs_arcv2);
	195	else
	196	copy_sz = 4; /* r30 only */
	197
	198	/*
	199	* itemized copy not needed like above as layout of regs (r30,r58,r59)
	200	* is exactly same in kernel (pt_regs) and userspace (user_regs_arcv2)
	201	*/
	202	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &regs->r30,
	203	0, copy_sz);
	204
	205	return ret;
	206	}
	207
	208	static int arcv2regs_set(struct task_struct *target,
	209	const struct user_regset *regset,
	210	unsigned int pos, unsigned int count,
	211	const void kbuf, const void __user ubuf)
	212	{
	213	const struct pt_regs *regs = task_pt_regs(target);
	214	int ret, copy_sz;
	215
	216	if (IS_ENABLED(CONFIG_ARC_HAS_ACCL_REGS))
	217	copy_sz = sizeof(struct user_regs_arcv2);
	218	else
	219	copy_sz = 4; /* r30 only */
	220
	221	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, (void *)&regs->r30,
	222	0, copy_sz);
	223
	224	return ret;
	225	}
	226
	227	#endif
	228
547f1125	229	enum arc_getset {
65c02a55 VG	230	REGSET_CMN,
65c02a55 VG	231	REGSET_ARCV2,
547f1125 VG	232	};
	233
	234	static const struct user_regset arc_regsets[] = {
65c02a55	235	[REGSET_CMN] = {
547f1125 VG	236	.core_note_type = NT_PRSTATUS,
	237	.n = ELF_NGREG,
	238	.size = sizeof(unsigned long),
	239	.align = sizeof(unsigned long),
	240	.get = genregs_get,
	241	.set = genregs_set,
65c02a55 VG	242	},
	243	#ifdef CONFIG_ISA_ARCV2
	244	[REGSET_ARCV2] = {
	245	.core_note_type = NT_ARC_V2,
	246	.n = ELF_ARCV2REG,
	247	.size = sizeof(unsigned long),
	248	.align = sizeof(unsigned long),
	249	.get = arcv2regs_get,
	250	.set = arcv2regs_set,
	251	},
	252	#endif
547f1125 VG	253	};
	254
	255	static const struct user_regset_view user_arc_view = {
9eca345c	256	.name = "arc",
1f6ccfff	257	.e_machine = EM_ARC_INUSE,
547f1125 VG	258	.regsets = arc_regsets,
	259	.n = ARRAY_SIZE(arc_regsets)
	260	};
	261
	262	const struct user_regset_view task_user_regset_view(struct task_struct task)
	263	{
	264	return &user_arc_view;
	265	}
c08098f2 VG	266
	267	void ptrace_disable(struct task_struct *child)
	268	{
	269	}
	270
	271	long arch_ptrace(struct task_struct *child, long request,
	272	unsigned long addr, unsigned long data)
	273	{
	274	int ret = -EIO;
547f1125 VG	275
	276	pr_debug("REQ=%ld: ADDR =0x%lx, DATA=0x%lx)\n", request, addr, data);
	277
	278	switch (request) {
a4b6cb73 AK	279	case PTRACE_GET_THREAD_AREA:
	280	ret = put_user(task_thread_info(child)->thr_ptr,
	281	(unsigned long __user *)data);
	282	break;
547f1125 VG	283	default:
	284	ret = ptrace_request(child, request, addr, data);
	285	break;
	286	}
	287
c08098f2 VG	288	return ret;
	289	}
	290
547f1125 VG	291	asmlinkage int syscall_trace_entry(struct pt_regs *regs)
	292	{
	293	if (tracehook_report_syscall_entry(regs))
	294	return ULONG_MAX;
c08098f2	295
547f1125 VG	296	return regs->r8;
	297	}
	298
	299	asmlinkage void syscall_trace_exit(struct pt_regs *regs)
c08098f2	300	{
547f1125	301	tracehook_report_syscall_exit(regs, 0);
c08098f2	302	}