[deliverable/linux.git] / arch / nios2 / kernel / ptrace.c

/*
 * Copyright (C) 2014 Altera Corporation
 * Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch>
 *
 * This file is subject to the terms and conditions of the GNU General
 * Public License.  See the file COPYING in the main directory of this
 * archive for more details.
 */

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

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);
	const struct switch_stack *sw = (struct switch_stack *)regs - 1;
	int ret = 0;

#define REG_O_ZERO_RANGE(START, END)		\
	if (!ret)					\
		ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, \
			START * 4, (END * 4) + 4);

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

#define REG_O_RANGE(PTR, START, END)	\
	if (!ret)				\
		ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, PTR, \
			START * 4, (END * 4) + 4);

	REG_O_ZERO_RANGE(PTR_R0, PTR_R0);
	REG_O_RANGE(&regs->r1, PTR_R1, PTR_R7);
	REG_O_RANGE(&regs->r8, PTR_R8, PTR_R15);
	REG_O_RANGE(sw, PTR_R16, PTR_R23);
	REG_O_ZERO_RANGE(PTR_R24, PTR_R25); /* et and bt */
	REG_O_ONE(&regs->gp, PTR_GP);
	REG_O_ONE(&regs->sp, PTR_SP);
	REG_O_ONE(&regs->fp, PTR_FP);
	REG_O_ONE(&regs->ea, PTR_EA);
	REG_O_ZERO_RANGE(PTR_BA, PTR_BA);
	REG_O_ONE(&regs->ra, PTR_RA);
	REG_O_ONE(&regs->ea, PTR_PC); /* use ea for PC */
	if (!ret)
		ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
					 PTR_STATUS * 4, -1);

	return ret;
}

/*
 * Set the thread state from a regset passed in via ptrace
 */
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);
	const struct switch_stack *sw = (struct switch_stack *)regs - 1;
	int ret = 0;

#define REG_IGNORE_RANGE(START, END)		\
	if (!ret)					\
		ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, \
			START * 4, (END * 4) + 4);

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

#define REG_IN_RANGE(PTR, START, END)	\
	if (!ret)				\
		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, \
			(void *)(PTR), START * 4, (END * 4) + 4);

	REG_IGNORE_RANGE(PTR_R0, PTR_R0);
	REG_IN_RANGE(&regs->r1, PTR_R1, PTR_R7);
	REG_IN_RANGE(&regs->r8, PTR_R8, PTR_R15);
	REG_IN_RANGE(sw, PTR_R16, PTR_R23);
	REG_IGNORE_RANGE(PTR_R24, PTR_R25); /* et and bt */
	REG_IN_ONE(&regs->gp, PTR_GP);
	REG_IN_ONE(&regs->sp, PTR_SP);
	REG_IN_ONE(&regs->fp, PTR_FP);
	REG_IN_ONE(&regs->ea, PTR_EA);
	REG_IGNORE_RANGE(PTR_BA, PTR_BA);
	REG_IN_ONE(&regs->ra, PTR_RA);
	REG_IN_ONE(&regs->ea, PTR_PC); /* use ea for PC */
	if (!ret)
		ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
					 PTR_STATUS * 4, -1);

	return ret;
}

/*
 * Define the register sets available on Nios2 under Linux
 */
enum nios2_regset {
	REGSET_GENERAL,
};

static const struct user_regset nios2_regsets[] = {
	[REGSET_GENERAL] = {
		.core_note_type = NT_PRSTATUS,
		.n = NUM_PTRACE_REG,
		.size = sizeof(unsigned long),
		.align = sizeof(unsigned long),
		.get = genregs_get,
		.set = genregs_set,
	}
};

static const struct user_regset_view nios2_user_view = {
	.name = "nios2",
	.e_machine = ELF_ARCH,
	.ei_osabi = ELF_OSABI,
	.regsets = nios2_regsets,
	.n = ARRAY_SIZE(nios2_regsets)
};

const struct user_regset_view *task_user_regset_view(struct task_struct *task)
{
	return &nios2_user_view;
}

void ptrace_disable(struct task_struct *child)
{

}

long arch_ptrace(struct task_struct *child, long request, unsigned long addr,
		 unsigned long data)
{
	return ptrace_request(child, request, addr, data);
}

asmlinkage int do_syscall_trace_enter(void)
{
	int ret = 0;

	if (test_thread_flag(TIF_SYSCALL_TRACE))
		ret = tracehook_report_syscall_entry(task_pt_regs(current));

	return ret;
}

asmlinkage void do_syscall_trace_exit(void)
{
	if (test_thread_flag(TIF_SYSCALL_TRACE))
		tracehook_report_syscall_exit(task_pt_regs(current), 0);
}
Commit	Line	Data
106174d0 LFT	1	/*
	2	* Copyright (C) 2014 Altera Corporation
	3	* Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch>
	4	*
	5	* This file is subject to the terms and conditions of the GNU General
	6	* Public License. See the file COPYING in the main directory of this
	7	* archive for more details.
	8	*/
	9
	10	#include <linux/elf.h>
	11	#include <linux/errno.h>
	12	#include <linux/kernel.h>
	13	#include <linux/mm.h>
	14	#include <linux/ptrace.h>
	15	#include <linux/regset.h>
	16	#include <linux/sched.h>
	17	#include <linux/tracehook.h>
	18	#include <linux/uaccess.h>
	19	#include <linux/user.h>
	20
	21	static int genregs_get(struct task_struct *target,
	22	const struct user_regset *regset,
	23	unsigned int pos, unsigned int count,
	24	void kbuf, void __user ubuf)
	25	{
	26	const struct pt_regs *regs = task_pt_regs(target);
	27	const struct switch_stack sw = (struct switch_stack )regs - 1;
	28	int ret = 0;
	29
	30	#define REG_O_ZERO_RANGE(START, END) \
	31	if (!ret) \
	32	ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, \
	33	START * 4, (END * 4) + 4);
	34
	35	#define REG_O_ONE(PTR, LOC) \
	36	if (!ret) \
	37	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, PTR, \
	38	LOC * 4, (LOC * 4) + 4);
	39
	40	#define REG_O_RANGE(PTR, START, END) \
	41	if (!ret) \
	42	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, PTR, \
	43	START * 4, (END * 4) + 4);
	44
	45	REG_O_ZERO_RANGE(PTR_R0, PTR_R0);
	46	REG_O_RANGE(&regs->r1, PTR_R1, PTR_R7);
	47	REG_O_RANGE(&regs->r8, PTR_R8, PTR_R15);
	48	REG_O_RANGE(sw, PTR_R16, PTR_R23);
	49	REG_O_ZERO_RANGE(PTR_R24, PTR_R25); /* et and bt */
	50	REG_O_ONE(&regs->gp, PTR_GP);
	51	REG_O_ONE(&regs->sp, PTR_SP);
	52	REG_O_ONE(&regs->fp, PTR_FP);
	53	REG_O_ONE(&regs->ea, PTR_EA);
	54	REG_O_ZERO_RANGE(PTR_BA, PTR_BA);
	55	REG_O_ONE(&regs->ra, PTR_RA);
	56	REG_O_ONE(&regs->ea, PTR_PC); /* use ea for PC */
	57	if (!ret)
	58	ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
	59	PTR_STATUS * 4, -1);
	60
	61	return ret;
	62	}
	63
	64	/*
65	* Set the thread state from a regset passed in via ptrace
66	*/
67	static int genregs_set(struct task_struct *target,
68	const struct user_regset *regset,
69	unsigned int pos, unsigned int count,
70	const void kbuf, const void __user ubuf)
71	{
72	struct pt_regs *regs = task_pt_regs(target);
73	const struct switch_stack sw = (struct switch_stack )regs - 1;
74	int ret = 0;
75
76	#define REG_IGNORE_RANGE(START, END) \
77	if (!ret) \
78	ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, \
79	START * 4, (END * 4) + 4);
80
81	#define REG_IN_ONE(PTR, LOC) \
82	if (!ret) \
83	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, \
84	(void )(PTR), LOC 4, (LOC * 4) + 4);
85
86	#define REG_IN_RANGE(PTR, START, END) \
87	if (!ret) \
88	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, \
89	(void )(PTR), START 4, (END * 4) + 4);
90
91	REG_IGNORE_RANGE(PTR_R0, PTR_R0);
92	REG_IN_RANGE(&regs->r1, PTR_R1, PTR_R7);
93	REG_IN_RANGE(&regs->r8, PTR_R8, PTR_R15);
94	REG_IN_RANGE(sw, PTR_R16, PTR_R23);
95	REG_IGNORE_RANGE(PTR_R24, PTR_R25); /* et and bt */
96	REG_IN_ONE(&regs->gp, PTR_GP);
97	REG_IN_ONE(&regs->sp, PTR_SP);
98	REG_IN_ONE(&regs->fp, PTR_FP);
99	REG_IN_ONE(&regs->ea, PTR_EA);
100	REG_IGNORE_RANGE(PTR_BA, PTR_BA);
101	REG_IN_ONE(&regs->ra, PTR_RA);
102	REG_IN_ONE(&regs->ea, PTR_PC); /* use ea for PC */
103	if (!ret)
104	ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
105	PTR_STATUS * 4, -1);
106
107	return ret;
108	}
109
110	/*
111	* Define the register sets available on Nios2 under Linux
112	*/
113	enum nios2_regset {
114	REGSET_GENERAL,
115	};
116
117	static const struct user_regset nios2_regsets[] = {
118	[REGSET_GENERAL] = {
119	.core_note_type = NT_PRSTATUS,
120	.n = NUM_PTRACE_REG,
121	.size = sizeof(unsigned long),
122	.align = sizeof(unsigned long),
123	.get = genregs_get,
124	.set = genregs_set,
125	}
126	};
127
128	static const struct user_regset_view nios2_user_view = {
129	.name = "nios2",
130	.e_machine = ELF_ARCH,
131	.ei_osabi = ELF_OSABI,
132	.regsets = nios2_regsets,
133	.n = ARRAY_SIZE(nios2_regsets)
134	};
135
136	const struct user_regset_view task_user_regset_view(struct task_struct task)
137	{
138	return &nios2_user_view;
139	}
140
141	void ptrace_disable(struct task_struct *child)
142	{
143
144	}
145
146	long arch_ptrace(struct task_struct *child, long request, unsigned long addr,
147	unsigned long data)
148	{
149	return ptrace_request(child, request, addr, data);
150	}
151
152	asmlinkage int do_syscall_trace_enter(void)
153	{
154	int ret = 0;
155
156	if (test_thread_flag(TIF_SYSCALL_TRACE))
157	ret = tracehook_report_syscall_entry(task_pt_regs(current));
158
159	return ret;
160	}
161
162	asmlinkage void do_syscall_trace_exit(void)
163	{
164	if (test_thread_flag(TIF_SYSCALL_TRACE))
165	tracehook_report_syscall_exit(task_pt_regs(current), 0);
166	}