[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / m68k / kernel / ptrace.c

/*
 *  linux/arch/m68k/kernel/ptrace.c
 *
 *  Copyright (C) 1994 by Hamish Macdonald
 *  Taken from linux/kernel/ptrace.c and modified for M680x0.
 *  linux/kernel/ptrace.c is by Ross Biro 1/23/92, edited by Linus Torvalds
 *
 * 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/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/signal.h>
#include <linux/tracehook.h>

#include <asm/uaccess.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/processor.h>

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

/* determines which bits in the SR the user has access to. */
/* 1 = access 0 = no access */
#define SR_MASK 0x001f

/* sets the trace bits. */
#define TRACE_BITS 0xC000
#define T1_BIT 0x8000
#define T0_BIT 0x4000

/* Find the stack offset for a register, relative to thread.esp0. */
#define PT_REG(reg)	((long)&((struct pt_regs *)0)->reg)
#define SW_REG(reg)	((long)&((struct switch_stack *)0)->reg \
			 - sizeof(struct switch_stack))
/* Mapping from PT_xxx to the stack offset at which the register is
   saved.  Notice that usp has no stack-slot and needs to be treated
   specially (see get_reg/put_reg below). */
static const int regoff[] = {
	[0]	= PT_REG(d1),
	[1]	= PT_REG(d2),
	[2]	= PT_REG(d3),
	[3]	= PT_REG(d4),
	[4]	= PT_REG(d5),
	[5]	= SW_REG(d6),
	[6]	= SW_REG(d7),
	[7]	= PT_REG(a0),
	[8]	= PT_REG(a1),
	[9]	= PT_REG(a2),
	[10]	= SW_REG(a3),
	[11]	= SW_REG(a4),
	[12]	= SW_REG(a5),
	[13]	= SW_REG(a6),
	[14]	= PT_REG(d0),
	[15]	= -1,
	[16]	= PT_REG(orig_d0),
	[17]	= PT_REG(sr),
	[18]	= PT_REG(pc),
};

/*
 * Get contents of register REGNO in task TASK.
 */
static inline long get_reg(struct task_struct *task, int regno)
{
	unsigned long *addr;

	if (regno == PT_USP)
		addr = &task->thread.usp;
	else if (regno < ARRAY_SIZE(regoff))
		addr = (unsigned long *)(task->thread.esp0 + regoff[regno]);
	else
		return 0;
	/* Need to take stkadj into account. */
	if (regno == PT_SR || regno == PT_PC) {
		long stkadj = *(long *)(task->thread.esp0 + PT_REG(stkadj));
		addr = (unsigned long *) ((unsigned long)addr + stkadj);
		/* The sr is actually a 16 bit register.  */
		if (regno == PT_SR)
			return *(unsigned short *)addr;
	}
	return *addr;
}

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

	if (regno == PT_USP)
		addr = &task->thread.usp;
	else if (regno < ARRAY_SIZE(regoff))
		addr = (unsigned long *)(task->thread.esp0 + regoff[regno]);
	else
		return -1;
	/* Need to take stkadj into account. */
	if (regno == PT_SR || regno == PT_PC) {
		long stkadj = *(long *)(task->thread.esp0 + PT_REG(stkadj));
		addr = (unsigned long *) ((unsigned long)addr + stkadj);
		/* The sr is actually a 16 bit register.  */
		if (regno == PT_SR) {
			*(unsigned short *)addr = data;
			return 0;
		}
	}
	*addr = data;
	return 0;
}

/*
 * Make sure the single step bit is not set.
 */
static inline void singlestep_disable(struct task_struct *child)
{
	unsigned long tmp = get_reg(child, PT_SR) & ~TRACE_BITS;
	put_reg(child, PT_SR, tmp);
	clear_tsk_thread_flag(child, TIF_DELAYED_TRACE);
}

/*
 * Called by kernel/ptrace.c when detaching..
 */
void ptrace_disable(struct task_struct *child)
{
	singlestep_disable(child);
}

void user_enable_single_step(struct task_struct *child)
{
	unsigned long tmp = get_reg(child, PT_SR) & ~TRACE_BITS;
	put_reg(child, PT_SR, tmp | T1_BIT);
	set_tsk_thread_flag(child, TIF_DELAYED_TRACE);
}

#ifdef CONFIG_MMU
void user_enable_block_step(struct task_struct *child)
{
	unsigned long tmp = get_reg(child, PT_SR) & ~TRACE_BITS;
	put_reg(child, PT_SR, tmp | T0_BIT);
}
#endif

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

long arch_ptrace(struct task_struct *child, long request,
		 unsigned long addr, unsigned long data)
{
	unsigned long tmp;
	int i, ret = 0;
	int regno = addr >> 2; /* temporary hack. */
	unsigned long __user *datap = (unsigned long __user *) data;

	switch (request) {
	/* read the word at location addr in the USER area. */
	case PTRACE_PEEKUSR:
		if (addr & 3)
			goto out_eio;

		if (regno >= 0 && regno < 19) {
			tmp = get_reg(child, regno);
		} else if (regno >= 21 && regno < 49) {
			tmp = child->thread.fp[regno - 21];
			/* Convert internal fpu reg representation
			 * into long double format
			 */
			if (FPU_IS_EMU && (regno < 45) && !(regno % 3))
				tmp = ((tmp & 0xffff0000) << 15) |
				      ((tmp & 0x0000ffff) << 16);
#ifndef CONFIG_MMU
		} else if (regno == 49) {
			tmp = child->mm->start_code;
		} else if (regno == 50) {
			tmp = child->mm->start_data;
		} else if (regno == 51) {
			tmp = child->mm->end_code;
#endif
		} else
			goto out_eio;
		ret = put_user(tmp, datap);
		break;

	case PTRACE_POKEUSR:
	/* write the word at location addr in the USER area */
		if (addr & 3)
			goto out_eio;

		if (regno == PT_SR) {
			data &= SR_MASK;
			data |= get_reg(child, PT_SR) & ~SR_MASK;
		}
		if (regno >= 0 && regno < 19) {
			if (put_reg(child, regno, data))
				goto out_eio;
		} else if (regno >= 21 && regno < 48) {
			/* Convert long double format
			 * into internal fpu reg representation
			 */
			if (FPU_IS_EMU && (regno < 45) && !(regno % 3)) {
				data <<= 15;
				data = (data & 0xffff0000) |
				       ((data & 0x0000ffff) >> 1);
			}
			child->thread.fp[regno - 21] = data;
		} else
			goto out_eio;
		break;

	case PTRACE_GETREGS:	/* Get all gp regs from the child. */
		for (i = 0; i < 19; i++) {
			tmp = get_reg(child, i);
			ret = put_user(tmp, datap);
			if (ret)
				break;
			datap++;
		}
		break;

	case PTRACE_SETREGS:	/* Set all gp regs in the child. */
		for (i = 0; i < 19; i++) {
			ret = get_user(tmp, datap);
			if (ret)
				break;
			if (i == PT_SR) {
				tmp &= SR_MASK;
				tmp |= get_reg(child, PT_SR) & ~SR_MASK;
			}
			put_reg(child, i, tmp);
			datap++;
		}
		break;

	case PTRACE_GETFPREGS:	/* Get the child FPU state. */
		if (copy_to_user(datap, &child->thread.fp,
				 sizeof(struct user_m68kfp_struct)))
			ret = -EFAULT;
		break;

	case PTRACE_SETFPREGS:	/* Set the child FPU state. */
		if (copy_from_user(&child->thread.fp, datap,
				   sizeof(struct user_m68kfp_struct)))
			ret = -EFAULT;
		break;

	case PTRACE_GET_THREAD_AREA:
		ret = put_user(task_thread_info(child)->tp_value, datap);
		break;

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

	return ret;
out_eio:
	return -EIO;
}

asmlinkage void syscall_trace(void)
{
	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) {
		send_sig(current->exit_code, current, 1);
		current->exit_code = 0;
	}
}

#if defined(CONFIG_COLDFIRE) || !defined(CONFIG_MMU)
asmlinkage int 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 syscall_trace_leave(void)
{
	if (test_thread_flag(TIF_SYSCALL_TRACE))
		tracehook_report_syscall_exit(task_pt_regs(current), 0);
}
#endif /* CONFIG_COLDFIRE */
Commit	Line	Data
43dec91f GU	1	/*
	2	* linux/arch/m68k/kernel/ptrace.c
	3	*
	4	* Copyright (C) 1994 by Hamish Macdonald
	5	* Taken from linux/kernel/ptrace.c and modified for M680x0.
	6	* linux/kernel/ptrace.c is by Ross Biro 1/23/92, edited by Linus Torvalds
	7	*
	8	* This file is subject to the terms and conditions of the GNU General
	9	* Public License. See the file COPYING in the main directory of
	10	* this archive for more details.
	11	*/
	12
	13	#include <linux/kernel.h>
	14	#include <linux/sched.h>
	15	#include <linux/mm.h>
	16	#include <linux/smp.h>
	17	#include <linux/errno.h>
	18	#include <linux/ptrace.h>
	19	#include <linux/user.h>
	20	#include <linux/signal.h>
	21	#include <linux/tracehook.h>
	22
	23	#include <asm/uaccess.h>
	24	#include <asm/page.h>
	25	#include <asm/pgtable.h>
43dec91f GU	26	#include <asm/processor.h>
	27
	28	/*
	29	* does not yet catch signals sent when the child dies.
	30	* in exit.c or in signal.c.
	31	*/
	32
	33	/* determines which bits in the SR the user has access to. */
	34	/* 1 = access 0 = no access */
	35	#define SR_MASK 0x001f
	36
	37	/* sets the trace bits. */
	38	#define TRACE_BITS 0xC000
	39	#define T1_BIT 0x8000
	40	#define T0_BIT 0x4000
	41
	42	/* Find the stack offset for a register, relative to thread.esp0. */
	43	#define PT_REG(reg) ((long)&((struct pt_regs *)0)->reg)
	44	#define SW_REG(reg) ((long)&((struct switch_stack *)0)->reg \
	45	- sizeof(struct switch_stack))
	46	/* Mapping from PT_xxx to the stack offset at which the register is
	47	saved. Notice that usp has no stack-slot and needs to be treated
	48	specially (see get_reg/put_reg below). */
	49	static const int regoff[] = {
	50	[0] = PT_REG(d1),
	51	[1] = PT_REG(d2),
	52	[2] = PT_REG(d3),
	53	[3] = PT_REG(d4),
	54	[4] = PT_REG(d5),
	55	[5] = SW_REG(d6),
	56	[6] = SW_REG(d7),
	57	[7] = PT_REG(a0),
	58	[8] = PT_REG(a1),
	59	[9] = PT_REG(a2),
	60	[10] = SW_REG(a3),
	61	[11] = SW_REG(a4),
	62	[12] = SW_REG(a5),
	63	[13] = SW_REG(a6),
	64	[14] = PT_REG(d0),
	65	[15] = -1,
	66	[16] = PT_REG(orig_d0),
	67	[17] = PT_REG(sr),
	68	[18] = PT_REG(pc),
	69	};
	70
	71	/*
	72	* Get contents of register REGNO in task TASK.
	73	*/
	74	static inline long get_reg(struct task_struct *task, int regno)
	75	{
	76	unsigned long *addr;
	77
	78	if (regno == PT_USP)
	79	addr = &task->thread.usp;
	80	else if (regno < ARRAY_SIZE(regoff))
	81	addr = (unsigned long *)(task->thread.esp0 + regoff[regno]);
	82	else
	83	return 0;
	84	/* Need to take stkadj into account. */
	85	if (regno == PT_SR \|\| regno == PT_PC) {
	86	long stkadj = (long )(task->thread.esp0 + PT_REG(stkadj));
	87	addr = (unsigned long *) ((unsigned long)addr + stkadj);
	88	/* The sr is actually a 16 bit register. */
	89	if (regno == PT_SR)
90	return (unsigned short )addr;
91	}
92	return *addr;
93	}
94
95	/*
96	* Write contents of register REGNO in task TASK.
97	*/
98	static inline int put_reg(struct task_struct *task, int regno,
99	unsigned long data)
100	{
101	unsigned long *addr;
102
103	if (regno == PT_USP)
104	addr = &task->thread.usp;
105	else if (regno < ARRAY_SIZE(regoff))
106	addr = (unsigned long *)(task->thread.esp0 + regoff[regno]);
107	else
108	return -1;
109	/* Need to take stkadj into account. */
110	if (regno == PT_SR \|\| regno == PT_PC) {
111	long stkadj = (long )(task->thread.esp0 + PT_REG(stkadj));
112	addr = (unsigned long *) ((unsigned long)addr + stkadj);
113	/* The sr is actually a 16 bit register. */
114	if (regno == PT_SR) {
115	(unsigned short )addr = data;
116	return 0;
117	}
118	}
119	*addr = data;
120	return 0;
121	}
122
123	/*
124	* Make sure the single step bit is not set.
125	*/
126	static inline void singlestep_disable(struct task_struct *child)
127	{
128	unsigned long tmp = get_reg(child, PT_SR) & ~TRACE_BITS;
129	put_reg(child, PT_SR, tmp);
130	clear_tsk_thread_flag(child, TIF_DELAYED_TRACE);
131	}
132
133	/*
134	* Called by kernel/ptrace.c when detaching..
135	*/
136	void ptrace_disable(struct task_struct *child)
137	{
138	singlestep_disable(child);
139	}
140
141	void user_enable_single_step(struct task_struct *child)
142	{
143	unsigned long tmp = get_reg(child, PT_SR) & ~TRACE_BITS;
144	put_reg(child, PT_SR, tmp \| T1_BIT);
145	set_tsk_thread_flag(child, TIF_DELAYED_TRACE);
146	}
147
66d857b0	148	#ifdef CONFIG_MMU
43dec91f GU	149	void user_enable_block_step(struct task_struct *child)
	150	{
	151	unsigned long tmp = get_reg(child, PT_SR) & ~TRACE_BITS;
	152	put_reg(child, PT_SR, tmp \| T0_BIT);
	153	}
66d857b0	154	#endif
43dec91f GU	155
	156	void user_disable_single_step(struct task_struct *child)
	157	{
	158	singlestep_disable(child);
	159	}
	160
	161	long arch_ptrace(struct task_struct *child, long request,
	162	unsigned long addr, unsigned long data)
	163	{
	164	unsigned long tmp;
	165	int i, ret = 0;
	166	int regno = addr >> 2; /* temporary hack. */
	167	unsigned long __user datap = (unsigned long __user ) data;
	168
	169	switch (request) {
	170	/* read the word at location addr in the USER area. */
	171	case PTRACE_PEEKUSR:
	172	if (addr & 3)
	173	goto out_eio;
	174
	175	if (regno >= 0 && regno < 19) {
	176	tmp = get_reg(child, regno);
	177	} else if (regno >= 21 && regno < 49) {
	178	tmp = child->thread.fp[regno - 21];
	179	/* Convert internal fpu reg representation
	180	* into long double format
	181	*/
	182	if (FPU_IS_EMU && (regno < 45) && !(regno % 3))
	183	tmp = ((tmp & 0xffff0000) << 15) \|
	184	((tmp & 0x0000ffff) << 16);
	185	#ifndef CONFIG_MMU
	186	} else if (regno == 49) {
	187	tmp = child->mm->start_code;
	188	} else if (regno == 50) {
	189	tmp = child->mm->start_data;
	190	} else if (regno == 51) {
	191	tmp = child->mm->end_code;
	192	#endif
	193	} else
	194	goto out_eio;
	195	ret = put_user(tmp, datap);
	196	break;
	197
	198	case PTRACE_POKEUSR:
	199	/* write the word at location addr in the USER area */
	200	if (addr & 3)
	201	goto out_eio;
	202
	203	if (regno == PT_SR) {
	204	data &= SR_MASK;
	205	data \|= get_reg(child, PT_SR) & ~SR_MASK;
	206	}
	207	if (regno >= 0 && regno < 19) {
	208	if (put_reg(child, regno, data))
	209	goto out_eio;
	210	} else if (regno >= 21 && regno < 48) {
	211	/* Convert long double format
	212	* into internal fpu reg representation
	213	*/
	214	if (FPU_IS_EMU && (regno < 45) && !(regno % 3)) {
	215	data <<= 15;
	216	data = (data & 0xffff0000) \|
	217	((data & 0x0000ffff) >> 1);
	218	}
219	child->thread.fp[regno - 21] = data;
220	} else
221	goto out_eio;
222	break;
223
224	case PTRACE_GETREGS: /* Get all gp regs from the child. */
225	for (i = 0; i < 19; i++) {
226	tmp = get_reg(child, i);
227	ret = put_user(tmp, datap);
228	if (ret)
229	break;
230	datap++;
231	}
232	break;
233
234	case PTRACE_SETREGS: /* Set all gp regs in the child. */
235	for (i = 0; i < 19; i++) {
236	ret = get_user(tmp, datap);
237	if (ret)
238	break;
239	if (i == PT_SR) {
240	tmp &= SR_MASK;
241	tmp \|= get_reg(child, PT_SR) & ~SR_MASK;
242	}
243	put_reg(child, i, tmp);
244	datap++;
245	}
246	break;
247
248	case PTRACE_GETFPREGS: /* Get the child FPU state. */
249	if (copy_to_user(datap, &child->thread.fp,
250	sizeof(struct user_m68kfp_struct)))
251	ret = -EFAULT;
252	break;
253
254	case PTRACE_SETFPREGS: /* Set the child FPU state. */
255	if (copy_from_user(&child->thread.fp, datap,
256	sizeof(struct user_m68kfp_struct)))
257	ret = -EFAULT;
258	break;
259
260	case PTRACE_GET_THREAD_AREA:
261	ret = put_user(task_thread_info(child)->tp_value, datap);
262	break;
263
264	default:
265	ret = ptrace_request(child, request, addr, data);
266	break;
267	}
268
269	return ret;
270	out_eio:
271	return -EIO;
272	}
273
274	asmlinkage void syscall_trace(void)
275	{
276	ptrace_notify(SIGTRAP \| ((current->ptrace & PT_TRACESYSGOOD)
277	? 0x80 : 0));
278	/*
279	* this isn't the same as continuing with a signal, but it will do
280	* for normal use. strace only continues with a signal if the
281	* stopping signal is not SIGTRAP. -brl
282	*/
283	if (current->exit_code) {
284	send_sig(current->exit_code, current, 1);
285	current->exit_code = 0;
286	}
287	}
288
70c778f7	289	#if defined(CONFIG_COLDFIRE) \|\| !defined(CONFIG_MMU)
43dec91f GU	290	asmlinkage int syscall_trace_enter(void)
	291	{
	292	int ret = 0;
	293
	294	if (test_thread_flag(TIF_SYSCALL_TRACE))
	295	ret = tracehook_report_syscall_entry(task_pt_regs(current));
	296	return ret;
	297	}
	298
	299	asmlinkage void syscall_trace_leave(void)
	300	{
	301	if (test_thread_flag(TIF_SYSCALL_TRACE))
	302	tracehook_report_syscall_exit(task_pt_regs(current), 0);
	303	}
	304	#endif /* CONFIG_COLDFIRE */