[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / mn10300 / kernel / ptrace.c

/* MN10300 Process tracing
 *
 * Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd.
 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
 * Modified by David Howells (dhowells@redhat.com)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public Licence
 * as published by the Free Software Foundation; either version
 * 2 of the Licence, or (at your option) any later version.
 */
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/errno.h>
#include <linux/ptrace.h>
#include <linux/user.h>
#include <linux/regset.h>
#include <linux/elf.h>
#include <linux/tracehook.h>
#include <asm/uaccess.h>
#include <asm/pgtable.h>
#include <asm/processor.h>
#include <asm/cacheflush.h>
#include <asm/fpu.h>
#include <asm/asm-offsets.h>

/*
 * translate ptrace register IDs into struct pt_regs offsets
 */
static const u8 ptrace_regid_to_frame[] = {
	[PT_A3 << 2]		= REG_A3,
	[PT_A2 << 2]		= REG_A2,
	[PT_D3 << 2]		= REG_D3,
	[PT_D2 << 2]		= REG_D2,
	[PT_MCVF << 2]		= REG_MCVF,
	[PT_MCRL << 2]		= REG_MCRL,
	[PT_MCRH << 2]		= REG_MCRH,
	[PT_MDRQ << 2]		= REG_MDRQ,
	[PT_E1 << 2]		= REG_E1,
	[PT_E0 << 2]		= REG_E0,
	[PT_E7 << 2]		= REG_E7,
	[PT_E6 << 2]		= REG_E6,
	[PT_E5 << 2]		= REG_E5,
	[PT_E4 << 2]		= REG_E4,
	[PT_E3 << 2]		= REG_E3,
	[PT_E2 << 2]		= REG_E2,
	[PT_SP << 2]		= REG_SP,
	[PT_LAR << 2]		= REG_LAR,
	[PT_LIR << 2]		= REG_LIR,
	[PT_MDR << 2]		= REG_MDR,
	[PT_A1 << 2]		= REG_A1,
	[PT_A0 << 2]		= REG_A0,
	[PT_D1 << 2]		= REG_D1,
	[PT_D0 << 2]		= REG_D0,
	[PT_ORIG_D0 << 2]	= REG_ORIG_D0,
	[PT_EPSW << 2]		= REG_EPSW,
	[PT_PC << 2]		= REG_PC,
};

static inline int get_stack_long(struct task_struct *task, int offset)
{
	return *(unsigned long *)
		((unsigned long) task->thread.uregs + offset);
}

static inline
int put_stack_long(struct task_struct *task, int offset, unsigned long data)
{
	unsigned long stack;

	stack = (unsigned long) task->thread.uregs + offset;
	*(unsigned long *) stack = data;
	return 0;
}

/*
 * retrieve the contents of MN10300 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)
{
	const struct pt_regs *regs = task_pt_regs(target);
	int ret;

	/* we need to skip regs->next */
	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
				  regs, 0, PT_ORIG_D0 * sizeof(long));
	if (ret < 0)
		return ret;

	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
				  &regs->orig_d0, PT_ORIG_D0 * sizeof(long),
				  NR_PTREGS * sizeof(long));
	if (ret < 0)
		return ret;

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

/*
 * update the contents of the MN10300 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);
	unsigned long tmp;
	int ret;

	/* we need to skip regs->next */
	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
				 regs, 0, PT_ORIG_D0 * sizeof(long));
	if (ret < 0)
		return ret;

	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
				 &regs->orig_d0, PT_ORIG_D0 * sizeof(long),
				 PT_EPSW * sizeof(long));
	if (ret < 0)
		return ret;

	/* we need to mask off changes to EPSW */
	tmp = regs->epsw;
	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
				 &tmp, PT_EPSW * sizeof(long),
				 PT_PC * sizeof(long));
	tmp &= EPSW_FLAG_V | EPSW_FLAG_C | EPSW_FLAG_N | EPSW_FLAG_Z;
	tmp |= regs->epsw & ~(EPSW_FLAG_V | EPSW_FLAG_C | EPSW_FLAG_N |
			      EPSW_FLAG_Z);
	regs->epsw = tmp;

	if (ret < 0)
		return ret;

	/* and finally load the PC */
	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
				 &regs->pc, PT_PC * sizeof(long),
				 NR_PTREGS * sizeof(long));

	if (ret < 0)
		return ret;

	return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
					 NR_PTREGS * sizeof(long), -1);
}

/*
 * retrieve the contents of MN10300 userspace FPU registers
 */
static int fpuregs_get(struct task_struct *target,
		       const struct user_regset *regset,
		       unsigned int pos, unsigned int count,
		       void *kbuf, void __user *ubuf)
{
	const struct fpu_state_struct *fpregs = &target->thread.fpu_state;
	int ret;

	unlazy_fpu(target);

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

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

/*
 * update the contents of the MN10300 userspace FPU registers
 */
static int fpuregs_set(struct task_struct *target,
		       const struct user_regset *regset,
		       unsigned int pos, unsigned int count,
		       const void *kbuf, const void __user *ubuf)
{
	struct fpu_state_struct fpu_state = target->thread.fpu_state;
	int ret;

	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
				 &fpu_state, 0, sizeof(fpu_state));
	if (ret < 0)
		return ret;

	fpu_kill_state(target);
	target->thread.fpu_state = fpu_state;
	set_using_fpu(target);

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

/*
 * determine if the FPU registers have actually been used
 */
static int fpuregs_active(struct task_struct *target,
			  const struct user_regset *regset)
{
	return is_using_fpu(target) ? regset->n : 0;
}

/*
 * Define the register sets available on the MN10300 under Linux
 */
enum mn10300_regset {
	REGSET_GENERAL,
	REGSET_FPU,
};

static const struct user_regset mn10300_regsets[] = {
	/*
	 * General register format is:
	 *	A3, A2, D3, D2, MCVF, MCRL, MCRH, MDRQ
	 *	E1, E0, E7...E2, SP, LAR, LIR, MDR
	 *	A1, A0, D1, D0, ORIG_D0, EPSW, PC
	 */
	[REGSET_GENERAL] = {
		.core_note_type	= NT_PRSTATUS,
		.n		= ELF_NGREG,
		.size		= sizeof(long),
		.align		= sizeof(long),
		.get		= genregs_get,
		.set		= genregs_set,
	},
	/*
	 * FPU register format is:
	 *	FS0-31, FPCR
	 */
	[REGSET_FPU] = {
		.core_note_type	= NT_PRFPREG,
		.n		= sizeof(struct fpu_state_struct) / sizeof(long),
		.size		= sizeof(long),
		.align		= sizeof(long),
		.get		= fpuregs_get,
		.set		= fpuregs_set,
		.active		= fpuregs_active,
	},
};

static const struct user_regset_view user_mn10300_native_view = {
	.name		= "mn10300",
	.e_machine	= EM_MN10300,
	.regsets	= mn10300_regsets,
	.n		= ARRAY_SIZE(mn10300_regsets),
};

const struct user_regset_view *task_user_regset_view(struct task_struct *task)
{
	return &user_mn10300_native_view;
}

/*
 * set the single-step bit
 */
void user_enable_single_step(struct task_struct *child)
{
#ifndef CONFIG_MN10300_USING_JTAG
	struct user *dummy = NULL;
	long tmp;

	tmp = get_stack_long(child, (unsigned long) &dummy->regs.epsw);
	tmp |= EPSW_T;
	put_stack_long(child, (unsigned long) &dummy->regs.epsw, tmp);
#endif
}

/*
 * make sure the single-step bit is not set
 */
void user_disable_single_step(struct task_struct *child)
{
#ifndef CONFIG_MN10300_USING_JTAG
	struct user *dummy = NULL;
	long tmp;

	tmp = get_stack_long(child, (unsigned long) &dummy->regs.epsw);
	tmp &= ~EPSW_T;
	put_stack_long(child, (unsigned long) &dummy->regs.epsw, tmp);
#endif
}

void ptrace_disable(struct task_struct *child)
{
	user_disable_single_step(child);
}

/*
 * handle the arch-specific side of process tracing
 */
long arch_ptrace(struct task_struct *child, long request,
		 unsigned long addr, unsigned long data)
{
	unsigned long tmp;
	int ret;
	unsigned long __user *datap = (unsigned long __user *) data;

	switch (request) {
	/* read the word at location addr in the USER area. */
	case PTRACE_PEEKUSR:
		ret = -EIO;
		if ((addr & 3) || addr > sizeof(struct user) - 3)
			break;

		tmp = 0;  /* Default return condition */
		if (addr < NR_PTREGS << 2)
			tmp = get_stack_long(child,
					     ptrace_regid_to_frame[addr]);
		ret = put_user(tmp, datap);
		break;

		/* write the word at location addr in the USER area */
	case PTRACE_POKEUSR:
		ret = -EIO;
		if ((addr & 3) || addr > sizeof(struct user) - 3)
			break;

		ret = 0;
		if (addr < NR_PTREGS << 2)
			ret = put_stack_long(child, ptrace_regid_to_frame[addr],
					     data);
		break;

	case PTRACE_GETREGS:	/* Get all integer regs from the child. */
		return copy_regset_to_user(child, &user_mn10300_native_view,
					   REGSET_GENERAL,
					   0, NR_PTREGS * sizeof(long),
					   datap);

	case PTRACE_SETREGS:	/* Set all integer regs in the child. */
		return copy_regset_from_user(child, &user_mn10300_native_view,
					     REGSET_GENERAL,
					     0, NR_PTREGS * sizeof(long),
					     datap);

	case PTRACE_GETFPREGS:	/* Get the child FPU state. */
		return copy_regset_to_user(child, &user_mn10300_native_view,
					   REGSET_FPU,
					   0, sizeof(struct fpu_state_struct),
					   datap);

	case PTRACE_SETFPREGS:	/* Set the child FPU state. */
		return copy_regset_from_user(child, &user_mn10300_native_view,
					     REGSET_FPU,
					     0, sizeof(struct fpu_state_struct),
					     datap);

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

	return ret;
}

/*
 * handle tracing of system call entry
 * - return the revised system call number or ULONG_MAX to cause ENOSYS
 */
asmlinkage unsigned long syscall_trace_entry(struct pt_regs *regs)
{
	if (tracehook_report_syscall_entry(regs))
		/* tracing decided this syscall should not happen, so
		 * We'll return a bogus call number to get an ENOSYS
		 * error, but leave the original number in
		 * regs->orig_d0
		 */
		return ULONG_MAX;

	return regs->orig_d0;
}

/*
 * handle tracing of system call exit
 */
asmlinkage void syscall_trace_exit(struct pt_regs *regs)
{
	tracehook_report_syscall_exit(regs, 0);
}
Commit	Line	Data
b920de1b DH	1	/* MN10300 Process tracing
	2	*
	3	* Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd.
	4	* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
	5	* Modified by David Howells (dhowells@redhat.com)
	6	*
	7	* This program is free software; you can redistribute it and/or
	8	* modify it under the terms of the GNU General Public Licence
	9	* as published by the Free Software Foundation; either version
	10	* 2 of the Licence, or (at your option) any later version.
	11	*/
	12	#include <linux/kernel.h>
	13	#include <linux/sched.h>
	14	#include <linux/mm.h>
	15	#include <linux/smp.h>
b920de1b DH	16	#include <linux/errno.h>
	17	#include <linux/ptrace.h>
	18	#include <linux/user.h>
5d289964 DH	19	#include <linux/regset.h>
	20	#include <linux/elf.h>
	21	#include <linux/tracehook.h>
b920de1b DH	22	#include <asm/uaccess.h>
b920de1b DH	23	#include <asm/pgtable.h>
b920de1b DH	24	#include <asm/processor.h>
	25	#include <asm/cacheflush.h>
	26	#include <asm/fpu.h>
	27	#include <asm/asm-offsets.h>
	28
	29	/*
	30	* translate ptrace register IDs into struct pt_regs offsets
	31	*/
	32	static const u8 ptrace_regid_to_frame[] = {
	33	[PT_A3 << 2] = REG_A3,
	34	[PT_A2 << 2] = REG_A2,
	35	[PT_D3 << 2] = REG_D3,
	36	[PT_D2 << 2] = REG_D2,
	37	[PT_MCVF << 2] = REG_MCVF,
	38	[PT_MCRL << 2] = REG_MCRL,
	39	[PT_MCRH << 2] = REG_MCRH,
	40	[PT_MDRQ << 2] = REG_MDRQ,
	41	[PT_E1 << 2] = REG_E1,
	42	[PT_E0 << 2] = REG_E0,
	43	[PT_E7 << 2] = REG_E7,
	44	[PT_E6 << 2] = REG_E6,
	45	[PT_E5 << 2] = REG_E5,
	46	[PT_E4 << 2] = REG_E4,
	47	[PT_E3 << 2] = REG_E3,
	48	[PT_E2 << 2] = REG_E2,
	49	[PT_SP << 2] = REG_SP,
	50	[PT_LAR << 2] = REG_LAR,
	51	[PT_LIR << 2] = REG_LIR,
	52	[PT_MDR << 2] = REG_MDR,
	53	[PT_A1 << 2] = REG_A1,
	54	[PT_A0 << 2] = REG_A0,
	55	[PT_D1 << 2] = REG_D1,
	56	[PT_D0 << 2] = REG_D0,
	57	[PT_ORIG_D0 << 2] = REG_ORIG_D0,
	58	[PT_EPSW << 2] = REG_EPSW,
	59	[PT_PC << 2] = REG_PC,
	60	};
	61
	62	static inline int get_stack_long(struct task_struct *task, int offset)
	63	{
	64	return (unsigned long )
	65	((unsigned long) task->thread.uregs + offset);
	66	}
	67
b920de1b DH	68	static inline
	69	int put_stack_long(struct task_struct *task, int offset, unsigned long data)
	70	{
	71	unsigned long stack;
	72
	73	stack = (unsigned long) task->thread.uregs + offset;
	74	(unsigned long ) stack = data;
	75	return 0;
	76	}
	77
5d289964 DH	78	/*
	79	* retrieve the contents of MN10300 userspace general registers
	80	*/
	81	static int genregs_get(struct task_struct *target,
	82	const struct user_regset *regset,
	83	unsigned int pos, unsigned int count,
	84	void kbuf, void __user ubuf)
b920de1b	85	{
5d289964 DH	86	const struct pt_regs *regs = task_pt_regs(target);
	87	int ret;
	88
	89	/* we need to skip regs->next */
	90	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
	91	regs, 0, PT_ORIG_D0 * sizeof(long));
	92	if (ret < 0)
	93	return ret;
	94
	95	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
	96	&regs->orig_d0, PT_ORIG_D0 * sizeof(long),
	97	NR_PTREGS * sizeof(long));
	98	if (ret < 0)
	99	return ret;
	100
	101	return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
	102	NR_PTREGS * sizeof(long), -1);
b920de1b DH	103	}
b920de1b DH	104
5d289964 DH	105	/*
	106	* update the contents of the MN10300 userspace general registers
	107	*/
	108	static int genregs_set(struct task_struct *target,
	109	const struct user_regset *regset,
	110	unsigned int pos, unsigned int count,
	111	const void kbuf, const void __user ubuf)
b920de1b	112	{
5d289964 DH	113	struct pt_regs *regs = task_pt_regs(target);
	114	unsigned long tmp;
	115	int ret;
	116
	117	/* we need to skip regs->next */
	118	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
	119	regs, 0, PT_ORIG_D0 * sizeof(long));
	120	if (ret < 0)
	121	return ret;
	122
	123	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
	124	&regs->orig_d0, PT_ORIG_D0 * sizeof(long),
	125	PT_EPSW * sizeof(long));
	126	if (ret < 0)
	127	return ret;
	128
	129	/* we need to mask off changes to EPSW */
	130	tmp = regs->epsw;
	131	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
	132	&tmp, PT_EPSW * sizeof(long),
	133	PT_PC * sizeof(long));
	134	tmp &= EPSW_FLAG_V \| EPSW_FLAG_C \| EPSW_FLAG_N \| EPSW_FLAG_Z;
	135	tmp \|= regs->epsw & ~(EPSW_FLAG_V \| EPSW_FLAG_C \| EPSW_FLAG_N \|
	136	EPSW_FLAG_Z);
	137	regs->epsw = tmp;
	138
	139	if (ret < 0)
	140	return ret;
	141
	142	/* and finally load the PC */
	143	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
	144	&regs->pc, PT_PC * sizeof(long),
	145	NR_PTREGS * sizeof(long));
	146
	147	if (ret < 0)
	148	return ret;
	149
	150	return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
	151	NR_PTREGS * sizeof(long), -1);
b920de1b DH	152	}
b920de1b DH	153
5d289964 DH	154	/*
	155	* retrieve the contents of MN10300 userspace FPU registers
	156	*/
	157	static int fpuregs_get(struct task_struct *target,
	158	const struct user_regset *regset,
	159	unsigned int pos, unsigned int count,
	160	void kbuf, void __user ubuf)
b920de1b	161	{
5d289964 DH	162	const struct fpu_state_struct *fpregs = &target->thread.fpu_state;
	163	int ret;
	164
	165	unlazy_fpu(target);
	166
	167	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
	168	fpregs, 0, sizeof(*fpregs));
	169	if (ret < 0)
	170	return ret;
	171
	172	return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
	173	sizeof(*fpregs), -1);
b920de1b DH	174	}
	175
	176	/*
5d289964	177	* update the contents of the MN10300 userspace FPU registers
b920de1b	178	*/
5d289964 DH	179	static int fpuregs_set(struct task_struct *target,
	180	const struct user_regset *regset,
	181	unsigned int pos, unsigned int count,
	182	const void kbuf, const void __user ubuf)
	183	{
	184	struct fpu_state_struct fpu_state = target->thread.fpu_state;
	185	int ret;
	186
	187	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
	188	&fpu_state, 0, sizeof(fpu_state));
	189	if (ret < 0)
	190	return ret;
	191
	192	fpu_kill_state(target);
	193	target->thread.fpu_state = fpu_state;
	194	set_using_fpu(target);
	195
	196	return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
	197	sizeof(fpu_state), -1);
	198	}
	199
	200	/*
	201	* determine if the FPU registers have actually been used
	202	*/
	203	static int fpuregs_active(struct task_struct *target,
	204	const struct user_regset *regset)
	205	{
	206	return is_using_fpu(target) ? regset->n : 0;
	207	}
	208
	209	/*
	210	* Define the register sets available on the MN10300 under Linux
	211	*/
	212	enum mn10300_regset {
	213	REGSET_GENERAL,
	214	REGSET_FPU,
	215	};
	216
	217	static const struct user_regset mn10300_regsets[] = {
	218	/*
	219	* General register format is:
	220	* A3, A2, D3, D2, MCVF, MCRL, MCRH, MDRQ
	221	* E1, E0, E7...E2, SP, LAR, LIR, MDR
	222	* A1, A0, D1, D0, ORIG_D0, EPSW, PC
	223	*/
	224	[REGSET_GENERAL] = {
	225	.core_note_type = NT_PRSTATUS,
	226	.n = ELF_NGREG,
	227	.size = sizeof(long),
	228	.align = sizeof(long),
	229	.get = genregs_get,
	230	.set = genregs_set,
	231	},
	232	/*
	233	* FPU register format is:
	234	* FS0-31, FPCR
	235	*/
	236	[REGSET_FPU] = {
	237	.core_note_type = NT_PRFPREG,
	238	.n = sizeof(struct fpu_state_struct) / sizeof(long),
	239	.size = sizeof(long),
	240	.align = sizeof(long),
	241	.get = fpuregs_get,
	242	.set = fpuregs_set,
243	.active = fpuregs_active,
244	},
245	};
246
247	static const struct user_regset_view user_mn10300_native_view = {
248	.name = "mn10300",
249	.e_machine = EM_MN10300,
250	.regsets = mn10300_regsets,
251	.n = ARRAY_SIZE(mn10300_regsets),
252	};
253
254	const struct user_regset_view task_user_regset_view(struct task_struct task)
255	{
256	return &user_mn10300_native_view;
257	}
258
259	/*
260	* set the single-step bit
261	*/
262	void user_enable_single_step(struct task_struct *child)
b920de1b DH	263	{
	264	#ifndef CONFIG_MN10300_USING_JTAG
	265	struct user *dummy = NULL;
	266	long tmp;
	267
	268	tmp = get_stack_long(child, (unsigned long) &dummy->regs.epsw);
5d289964	269	tmp \|= EPSW_T;
b920de1b DH	270	put_stack_long(child, (unsigned long) &dummy->regs.epsw, tmp);
	271	#endif
	272	}
	273
	274	/*
5d289964	275	* make sure the single-step bit is not set
b920de1b	276	*/
5d289964	277	void user_disable_single_step(struct task_struct *child)
b920de1b DH	278	{
	279	#ifndef CONFIG_MN10300_USING_JTAG
	280	struct user *dummy = NULL;
	281	long tmp;
	282
	283	tmp = get_stack_long(child, (unsigned long) &dummy->regs.epsw);
5d289964	284	tmp &= ~EPSW_T;
b920de1b DH	285	put_stack_long(child, (unsigned long) &dummy->regs.epsw, tmp);
	286	#endif
	287	}
	288
5d289964 DH	289	void ptrace_disable(struct task_struct *child)
	290	{
	291	user_disable_single_step(child);
	292	}
	293
b920de1b DH	294	/*
	295	* handle the arch-specific side of process tracing
	296	*/
9b05a69e NK	297	long arch_ptrace(struct task_struct *child, long request,
9b05a69e NK	298	unsigned long addr, unsigned long data)
b920de1b	299	{
5d289964 DH	300	unsigned long tmp;
5d289964 DH	301	int ret;
261bb920	302	unsigned long __user datap = (unsigned long __user ) data;
b920de1b DH	303
b920de1b DH	304	switch (request) {
b920de1b	305	/* read the word at location addr in the USER area. */
5d289964	306	case PTRACE_PEEKUSR:
b920de1b	307	ret = -EIO;
261bb920	308	if ((addr & 3) \|\| addr > sizeof(struct user) - 3)
b920de1b DH	309	break;
	310
	311	tmp = 0; /* Default return condition */
	312	if (addr < NR_PTREGS << 2)
	313	tmp = get_stack_long(child,
	314	ptrace_regid_to_frame[addr]);
261bb920	315	ret = put_user(tmp, datap);
b920de1b	316	break;
b920de1b DH	317
	318	/* write the word at location addr in the USER area */
	319	case PTRACE_POKEUSR:
	320	ret = -EIO;
261bb920	321	if ((addr & 3) \|\| addr > sizeof(struct user) - 3)
b920de1b DH	322	break;
	323
	324	ret = 0;
	325	if (addr < NR_PTREGS << 2)
	326	ret = put_stack_long(child, ptrace_regid_to_frame[addr],
	327	data);
	328	break;
	329
5d289964 DH	330	case PTRACE_GETREGS: /* Get all integer regs from the child. */
	331	return copy_regset_to_user(child, &user_mn10300_native_view,
	332	REGSET_GENERAL,
	333	0, NR_PTREGS * sizeof(long),
261bb920	334	datap);
5d289964 DH	335
	336	case PTRACE_SETREGS: /* Set all integer regs in the child. */
	337	return copy_regset_from_user(child, &user_mn10300_native_view,
	338	REGSET_GENERAL,
	339	0, NR_PTREGS * sizeof(long),
261bb920	340	datap);
5d289964 DH	341
	342	case PTRACE_GETFPREGS: /* Get the child FPU state. */
	343	return copy_regset_to_user(child, &user_mn10300_native_view,
	344	REGSET_FPU,
	345	0, sizeof(struct fpu_state_struct),
261bb920	346	datap);
5d289964 DH	347
	348	case PTRACE_SETFPREGS: /* Set the child FPU state. */
	349	return copy_regset_from_user(child, &user_mn10300_native_view,
	350	REGSET_FPU,
	351	0, sizeof(struct fpu_state_struct),
261bb920	352	datap);
b920de1b DH	353
b920de1b DH	354	default:
5d289964	355	ret = ptrace_request(child, request, addr, data);
b920de1b DH	356	break;
	357	}
	358
	359	return ret;
	360	}
	361
	362	/*
5d289964 DH	363	* handle tracing of system call entry
5d289964 DH	364	* - return the revised system call number or ULONG_MAX to cause ENOSYS
b920de1b	365	*/
5d289964	366	asmlinkage unsigned long syscall_trace_entry(struct pt_regs *regs)
b920de1b	367	{
5d289964 DH	368	if (tracehook_report_syscall_entry(regs))
	369	/* tracing decided this syscall should not happen, so
	370	* We'll return a bogus call number to get an ENOSYS
	371	* error, but leave the original number in
	372	* regs->orig_d0
	373	*/
	374	return ULONG_MAX;
b920de1b	375
5d289964 DH	376	return regs->orig_d0;
5d289964 DH	377	}
b920de1b	378
5d289964 DH	379	/*
	380	* handle tracing of system call exit
	381	*/
	382	asmlinkage void syscall_trace_exit(struct pt_regs *regs)
	383	{
	384	tracehook_report_syscall_exit(regs, 0);
b920de1b	385	}