[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/errno.h>
#include <linux/ptrace.h>
#include <linux/user.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.
 */

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

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

	switch (request) {
	/* 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_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_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 = ptrace_request(child, request, addr, data);
			break;
	}
	return ret;
}

asmlinkage void do_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>
1da177e4 LT	22	#include <linux/errno.h>
	23	#include <linux/ptrace.h>
	24	#include <linux/user.h>
7ed20e1a	25	#include <linux/signal.h>
1da177e4 LT	26
	27	#include <asm/uaccess.h>
	28	#include <asm/page.h>
	29	#include <asm/pgtable.h>
	30	#include <asm/system.h>
	31	#include <asm/processor.h>
	32	#include <asm/signal.h>
	33
	34	/* cpu depend functions */
	35	extern long h8300_get_reg(struct task_struct *task, int regno);
	36	extern int h8300_put_reg(struct task_struct *task, int regno, unsigned long data);
	37	extern void h8300_disable_trace(struct task_struct *child);
	38	extern void h8300_enable_trace(struct task_struct *child);
	39
	40	/*
	41	* does not yet catch signals sent when the child dies.
	42	* in exit.c or in signal.c.
	43	*/
	44
1da177e4 LT	45	void ptrace_disable(struct task_struct *child)
	46	{
	47	h8300_disable_trace(child);
	48	}
	49
481bed45	50	long arch_ptrace(struct task_struct *child, long request, long addr, long data)
1da177e4	51	{
1da177e4 LT	52	int ret;
1da177e4 LT	53
1da177e4	54	switch (request) {
1da177e4 LT	55	/* read the word at location addr in the USER area. */
	56	case PTRACE_PEEKUSR: {
	57	unsigned long tmp = 0;
	58
	59	if ((addr & 3) \|\| addr < 0 \|\| addr >= sizeof(struct user)) {
	60	ret = -EIO;
	61	break ;
	62	}
	63
	64	ret = 0; /* Default return condition */
	65	addr = addr >> 2; /* temporary hack. */
	66
	67	if (addr < H8300_REGS_NO)
	68	tmp = h8300_get_reg(child, addr);
	69	else {
	70	switch(addr) {
	71	case 49:
	72	tmp = child->mm->start_code;
	73	break ;
	74	case 50:
	75	tmp = child->mm->start_data;
	76	break ;
	77	case 51:
	78	tmp = child->mm->end_code;
	79	break ;
	80	case 52:
	81	tmp = child->mm->end_data;
	82	break ;
	83	default:
	84	ret = -EIO;
	85	}
	86	}
	87	if (!ret)
	88	ret = put_user(tmp,(unsigned long *) data);
	89	break ;
	90	}
	91
	92	/* when I and D space are separate, this will have to be fixed. */
1da177e4 LT	93	case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
	94	if ((addr & 3) \|\| addr < 0 \|\| addr >= sizeof(struct user)) {
	95	ret = -EIO;
	96	break ;
	97	}
	98	addr = addr >> 2; /* temporary hack. */
	99
	100	if (addr == PT_ORIG_ER0) {
	101	ret = -EIO;
	102	break ;
	103	}
	104	if (addr < H8300_REGS_NO) {
	105	ret = h8300_put_reg(child, addr, data);
	106	break ;
	107	}
	108	ret = -EIO;
	109	break ;
	110	case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
	111	case PTRACE_CONT: { /* restart after signal. */
	112	ret = -EIO;
7ed20e1a	113	if (!valid_signal(data))
1da177e4 LT	114	break ;
	115	if (request == PTRACE_SYSCALL)
	116	set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
	117	else
	118	clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
	119	child->exit_code = data;
	120	wake_up_process(child);
	121	/* make sure the single step bit is not set. */
	122	h8300_disable_trace(child);
	123	ret = 0;
	124	}
	125
	126	/*
	127	* make the child exit. Best I can do is send it a sigkill.
	128	* perhaps it should be put in the status that it wants to
	129	* exit.
	130	*/
	131	case PTRACE_KILL: {
	132
	133	ret = 0;
	134	if (child->exit_state == EXIT_ZOMBIE) /* already dead */
	135	break;
	136	child->exit_code = SIGKILL;
	137	h8300_disable_trace(child);
	138	wake_up_process(child);
	139	break;
	140	}
	141
	142	case PTRACE_SINGLESTEP: { /* set the trap flag. */
	143	ret = -EIO;
7ed20e1a	144	if (!valid_signal(data))
1da177e4 LT	145	break;
	146	clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
	147	child->exit_code = data;
	148	h8300_enable_trace(child);
	149	wake_up_process(child);
	150	ret = 0;
	151	break;
	152	}
	153
1da177e4 LT	154	case PTRACE_GETREGS: { /* Get all gp regs from the child. */
	155	int i;
	156	unsigned long tmp;
	157	for (i = 0; i < H8300_REGS_NO; i++) {
	158	tmp = h8300_get_reg(child, i);
	159	if (put_user(tmp, (unsigned long *) data)) {
	160	ret = -EFAULT;
	161	break;
	162	}
	163	data += sizeof(long);
	164	}
	165	ret = 0;
	166	break;
	167	}
	168
	169	case PTRACE_SETREGS: { /* Set all gp regs in the child. */
	170	int i;
	171	unsigned long tmp;
	172	for (i = 0; i < H8300_REGS_NO; i++) {
	173	if (get_user(tmp, (unsigned long *) data)) {
	174	ret = -EFAULT;
	175	break;
	176	}
	177	h8300_put_reg(child, i, tmp);
	178	data += sizeof(long);
	179	}
	180	ret = 0;
	181	break;
	182	}
	183
	184	default:
b3c1e01a	185	ret = ptrace_request(child, request, addr, data);
1da177e4 LT	186	break;
1da177e4 LT	187	}
1da177e4 LT	188	return ret;
	189	}
	190
2fea299f	191	asmlinkage void do_syscall_trace(void)
1da177e4 LT	192	{
	193	if (!test_thread_flag(TIF_SYSCALL_TRACE))
	194	return;
	195	if (!(current->ptrace & PT_PTRACED))
	196	return;
	197	ptrace_notify(SIGTRAP \| ((current->ptrace & PT_TRACESYSGOOD)
	198	? 0x80 : 0));
	199	/*
	200	* this isn't the same as continuing with a signal, but it will do
	201	* for normal use. strace only continues with a signal if the
	202	* stopping signal is not SIGTRAP. -brl
	203	*/
	204	if (current->exit_code) {
	205	send_sig(current->exit_code, current, 1);
	206	current->exit_code = 0;
	207	}
	208	}