[net-next-2.6.git] / arch / h8300 / kernel / ptrace.c

/*
 *  linux/arch/h8300/kernel/ptrace.c
 *
 *  Yoshinori Sato <ysato@users.sourceforge.jp>
 *
 *  Based on:
 *  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/smp_lock.h>
#include <linux/errno.h>
#include <linux/ptrace.h>
#include <linux/user.h>
#include <linux/config.h>
#include <linux/signal.h>

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

/* cpu depend functions */
extern long h8300_get_reg(struct task_struct *task, int regno);
extern int  h8300_put_reg(struct task_struct *task, int regno, unsigned long data);
extern void h8300_disable_trace(struct task_struct *child);
extern void h8300_enable_trace(struct task_struct *child);

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

inline
static int read_long(struct task_struct * tsk, unsigned long addr,
	unsigned long * result)
{
	*result = *(unsigned long *)addr;
	return 0;
}

void ptrace_disable(struct task_struct *child)
{
	h8300_disable_trace(child);
}

asmlinkage int sys_ptrace(long request, long pid, long addr, long data)
{
	struct task_struct *child;
	int ret;

	lock_kernel();
	ret = -EPERM;
	if (request == PTRACE_TRACEME) {
		/* are we already being traced? */
		if (current->ptrace & PT_PTRACED)
			goto out;
		/* set the ptrace bit in the process flags. */
		current->ptrace |= PT_PTRACED;
		ret = 0;
		goto out;
	}
	ret = -ESRCH;
	read_lock(&tasklist_lock);
	child = find_task_by_pid(pid);
	if (child)
		get_task_struct(child);
	read_unlock(&tasklist_lock);
	if (!child)
		goto out;

	ret = -EPERM;
	if (pid == 1)		/* you may not mess with init */
		goto out_tsk;

	if (request == PTRACE_ATTACH) {
		ret = ptrace_attach(child);
		goto out_tsk;
	}
	ret = ptrace_check_attach(child, request == PTRACE_KILL);
	if (ret < 0)
		goto out_tsk;

	switch (request) {
		case PTRACE_PEEKTEXT: /* read word at location addr. */ 
		case PTRACE_PEEKDATA: {
			unsigned long tmp;

			ret = read_long(child, addr, &tmp);
			if (ret < 0)
				break ;
			ret = put_user(tmp, (unsigned long *) data);
			break ;
		}

	/* read the word at location addr in the USER area. */
		case PTRACE_PEEKUSR: {
			unsigned long tmp = 0;
			
			if ((addr & 3) || addr < 0 || addr >= sizeof(struct user)) {
				ret = -EIO;
				break ;
			}
			
		        ret = 0;  /* Default return condition */
			addr = addr >> 2; /* temporary hack. */

			if (addr < H8300_REGS_NO)
				tmp = h8300_get_reg(child, addr);
			else {
				switch(addr) {
				case 49:
					tmp = child->mm->start_code;
					break ;
				case 50:
					tmp = child->mm->start_data;
					break ;
				case 51:
					tmp = child->mm->end_code;
					break ;
				case 52:
					tmp = child->mm->end_data;
					break ;
				default:
					ret = -EIO;
				}
			}
			if (!ret)
				ret = put_user(tmp,(unsigned long *) data);
			break ;
		}

      /* when I and D space are separate, this will have to be fixed. */
		case PTRACE_POKETEXT: /* write the word at location addr. */
		case PTRACE_POKEDATA:
			ret = 0;
			if (access_process_vm(child, addr, &data, sizeof(data), 1) == sizeof(data))
				break;
			ret = -EIO;
			break;

		case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
			if ((addr & 3) || addr < 0 || addr >= sizeof(struct user)) {
				ret = -EIO;
				break ;
			}
			addr = addr >> 2; /* temporary hack. */
			    
			if (addr == PT_ORIG_ER0) {
				ret = -EIO;
				break ;
			}
			if (addr < H8300_REGS_NO) {
				ret = h8300_put_reg(child, addr, data);
				break ;
			}
			ret = -EIO;
			break ;
		case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
		case PTRACE_CONT: { /* restart after signal. */
			ret = -EIO;
			if (!valid_signal(data))
				break ;
			if (request == PTRACE_SYSCALL)
				set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
			else
				clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
			child->exit_code = data;
			wake_up_process(child);
			/* make sure the single step bit is not set. */
			h8300_disable_trace(child);
			ret = 0;
		}

/*
 * make the child exit.  Best I can do is send it a sigkill. 
 * perhaps it should be put in the status that it wants to 
 * exit.
 */
		case PTRACE_KILL: {

			ret = 0;
			if (child->exit_state == EXIT_ZOMBIE) /* already dead */
				break;
			child->exit_code = SIGKILL;
			h8300_disable_trace(child);
			wake_up_process(child);
			break;
		}

		case PTRACE_SINGLESTEP: {  /* set the trap flag. */
			ret = -EIO;
			if (!valid_signal(data))
				break;
			clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
			child->exit_code = data;
			h8300_enable_trace(child);
			wake_up_process(child);
			ret = 0;
			break;
		}

		case PTRACE_DETACH:	/* detach a process that was attached. */
			ret = ptrace_detach(child, data);
			break;

		case PTRACE_GETREGS: { /* Get all gp regs from the child. */
		  	int i;
			unsigned long tmp;
			for (i = 0; i < H8300_REGS_NO; i++) {
			    tmp = h8300_get_reg(child, i);
			    if (put_user(tmp, (unsigned long *) data)) {
				ret = -EFAULT;
				break;
			    }
			    data += sizeof(long);
			}
			ret = 0;
			break;
		}

		case PTRACE_SETREGS: { /* Set all gp regs in the child. */
			int i;
			unsigned long tmp;
			for (i = 0; i < H8300_REGS_NO; i++) {
			    if (get_user(tmp, (unsigned long *) data)) {
				ret = -EFAULT;
				break;
			    }
			    h8300_put_reg(child, i, tmp);
			    data += sizeof(long);
			}
			ret = 0;
			break;
		}

		default:
			ret = -EIO;
			break;
	}
out_tsk:
	put_task_struct(child);
out:
	unlock_kernel();
	return ret;
}

asmlinkage void syscall_trace(void)
{
	if (!test_thread_flag(TIF_SYSCALL_TRACE))
		return;
	if (!(current->ptrace & PT_PTRACED))
		return;
	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;
	}
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/arch/h8300/kernel/ptrace.c
	3	*
	4	* Yoshinori Sato <ysato@users.sourceforge.jp>
	5	*
	6	* Based on:
	7	* linux/arch/m68k/kernel/ptrace.c
	8	*
	9	* Copyright (C) 1994 by Hamish Macdonald
	10	* Taken from linux/kernel/ptrace.c and modified for M680x0.
	11	* linux/kernel/ptrace.c is by Ross Biro 1/23/92, edited by Linus Torvalds
	12	*
	13	* This file is subject to the terms and conditions of the GNU General
	14	* Public License. See the file COPYING in the main directory of
	15	* this archive for more details.
	16	*/
	17
	18	#include <linux/kernel.h>
	19	#include <linux/sched.h>
	20	#include <linux/mm.h>
	21	#include <linux/smp.h>
	22	#include <linux/smp_lock.h>
	23	#include <linux/errno.h>
	24	#include <linux/ptrace.h>
	25	#include <linux/user.h>
	26	#include <linux/config.h>
7ed20e1a	27	#include <linux/signal.h>
1da177e4 LT	28
	29	#include <asm/uaccess.h>
	30	#include <asm/page.h>
	31	#include <asm/pgtable.h>
	32	#include <asm/system.h>
	33	#include <asm/processor.h>
	34	#include <asm/signal.h>
	35
	36	/* cpu depend functions */
	37	extern long h8300_get_reg(struct task_struct *task, int regno);
	38	extern int h8300_put_reg(struct task_struct *task, int regno, unsigned long data);
	39	extern void h8300_disable_trace(struct task_struct *child);
	40	extern void h8300_enable_trace(struct task_struct *child);
	41
	42	/*
	43	* does not yet catch signals sent when the child dies.
	44	* in exit.c or in signal.c.
	45	*/
	46
	47	inline
	48	static int read_long(struct task_struct * tsk, unsigned long addr,
	49	unsigned long * result)
	50	{
	51	result = (unsigned long *)addr;
	52	return 0;
	53	}
	54
	55	void ptrace_disable(struct task_struct *child)
	56	{
	57	h8300_disable_trace(child);
	58	}
	59
	60	asmlinkage int sys_ptrace(long request, long pid, long addr, long data)
	61	{
	62	struct task_struct *child;
	63	int ret;
	64
	65	lock_kernel();
	66	ret = -EPERM;
	67	if (request == PTRACE_TRACEME) {
	68	/* are we already being traced? */
	69	if (current->ptrace & PT_PTRACED)
	70	goto out;
	71	/* set the ptrace bit in the process flags. */
	72	current->ptrace \|= PT_PTRACED;
	73	ret = 0;
	74	goto out;
	75	}
	76	ret = -ESRCH;
	77	read_lock(&tasklist_lock);
	78	child = find_task_by_pid(pid);
	79	if (child)
	80	get_task_struct(child);
	81	read_unlock(&tasklist_lock);
	82	if (!child)
	83	goto out;
	84
	85	ret = -EPERM;
	86	if (pid == 1) /* you may not mess with init */
	87	goto out_tsk;
	88
	89	if (request == PTRACE_ATTACH) {
	90	ret = ptrace_attach(child);
	91	goto out_tsk;
92	}
93	ret = ptrace_check_attach(child, request == PTRACE_KILL);
94	if (ret < 0)
95	goto out_tsk;
96
97	switch (request) {
98	case PTRACE_PEEKTEXT: /* read word at location addr. */
99	case PTRACE_PEEKDATA: {
100	unsigned long tmp;
101
102	ret = read_long(child, addr, &tmp);
103	if (ret < 0)
104	break ;
105	ret = put_user(tmp, (unsigned long *) data);
106	break ;
107	}
108
109	/* read the word at location addr in the USER area. */
110	case PTRACE_PEEKUSR: {
111	unsigned long tmp = 0;
112
113	if ((addr & 3) \|\| addr < 0 \|\| addr >= sizeof(struct user)) {
114	ret = -EIO;
115	break ;
116	}
117
118	ret = 0; /* Default return condition */
119	addr = addr >> 2; /* temporary hack. */
120
121	if (addr < H8300_REGS_NO)
122	tmp = h8300_get_reg(child, addr);
123	else {
124	switch(addr) {
125	case 49:
126	tmp = child->mm->start_code;
127	break ;
128	case 50:
129	tmp = child->mm->start_data;
130	break ;
131	case 51:
132	tmp = child->mm->end_code;
133	break ;
134	case 52:
135	tmp = child->mm->end_data;
136	break ;
137	default:
138	ret = -EIO;
139	}
140	}
141	if (!ret)
142	ret = put_user(tmp,(unsigned long *) data);
143	break ;
144	}
145
146	/* when I and D space are separate, this will have to be fixed. */
147	case PTRACE_POKETEXT: /* write the word at location addr. */
148	case PTRACE_POKEDATA:
149	ret = 0;
150	if (access_process_vm(child, addr, &data, sizeof(data), 1) == sizeof(data))
151	break;
152	ret = -EIO;
153	break;
154
155	case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
156	if ((addr & 3) \|\| addr < 0 \|\| addr >= sizeof(struct user)) {
157	ret = -EIO;
158	break ;
159	}
160	addr = addr >> 2; /* temporary hack. */
161
162	if (addr == PT_ORIG_ER0) {
163	ret = -EIO;
164	break ;
165	}
166	if (addr < H8300_REGS_NO) {
167	ret = h8300_put_reg(child, addr, data);
168	break ;
169	}
170	ret = -EIO;
171	break ;
172	case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
173	case PTRACE_CONT: { /* restart after signal. */
174	ret = -EIO;
7ed20e1a	175	if (!valid_signal(data))
1da177e4 LT	176	break ;
	177	if (request == PTRACE_SYSCALL)
	178	set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
	179	else
	180	clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
	181	child->exit_code = data;
	182	wake_up_process(child);
	183	/* make sure the single step bit is not set. */
	184	h8300_disable_trace(child);
	185	ret = 0;
	186	}
	187
	188	/*
	189	* make the child exit. Best I can do is send it a sigkill.
	190	* perhaps it should be put in the status that it wants to
	191	* exit.
	192	*/
	193	case PTRACE_KILL: {
	194
	195	ret = 0;
	196	if (child->exit_state == EXIT_ZOMBIE) /* already dead */
	197	break;
	198	child->exit_code = SIGKILL;
	199	h8300_disable_trace(child);
	200	wake_up_process(child);
	201	break;
	202	}
	203
	204	case PTRACE_SINGLESTEP: { /* set the trap flag. */
	205	ret = -EIO;
7ed20e1a	206	if (!valid_signal(data))
1da177e4 LT	207	break;
	208	clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
	209	child->exit_code = data;
	210	h8300_enable_trace(child);
	211	wake_up_process(child);
	212	ret = 0;
	213	break;
	214	}
	215
	216	case PTRACE_DETACH: /* detach a process that was attached. */
	217	ret = ptrace_detach(child, data);
	218	break;
	219
	220	case PTRACE_GETREGS: { /* Get all gp regs from the child. */
	221	int i;
	222	unsigned long tmp;
	223	for (i = 0; i < H8300_REGS_NO; i++) {
	224	tmp = h8300_get_reg(child, i);
	225	if (put_user(tmp, (unsigned long *) data)) {
	226	ret = -EFAULT;
	227	break;
	228	}
	229	data += sizeof(long);
	230	}
	231	ret = 0;
	232	break;
	233	}
	234
	235	case PTRACE_SETREGS: { /* Set all gp regs in the child. */
	236	int i;
	237	unsigned long tmp;
	238	for (i = 0; i < H8300_REGS_NO; i++) {
	239	if (get_user(tmp, (unsigned long *) data)) {
	240	ret = -EFAULT;
	241	break;
	242	}
	243	h8300_put_reg(child, i, tmp);
	244	data += sizeof(long);
	245	}
	246	ret = 0;
	247	break;
	248	}
	249
	250	default:
	251	ret = -EIO;
	252	break;
	253	}
	254	out_tsk:
	255	put_task_struct(child);
	256	out:
	257	unlock_kernel();
	258	return ret;
	259	}
	260
	261	asmlinkage void syscall_trace(void)
	262	{
	263	if (!test_thread_flag(TIF_SYSCALL_TRACE))
	264	return;
	265	if (!(current->ptrace & PT_PTRACED))
	266	return;
	267	ptrace_notify(SIGTRAP \| ((current->ptrace & PT_TRACESYSGOOD)
	268	? 0x80 : 0));
	269	/*
	270	* this isn't the same as continuing with a signal, but it will do
271	* for normal use. strace only continues with a signal if the
272	* stopping signal is not SIGTRAP. -brl
273	*/
274	if (current->exit_code) {
275	send_sig(current->exit_code, current, 1);
276	current->exit_code = 0;
277	}
278	}