[deliverable/linux.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/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);
}

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

	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;
	}
	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>
7ed20e1a	26	#include <linux/signal.h>
1da177e4 LT	27
	28	#include <asm/uaccess.h>
	29	#include <asm/page.h>
	30	#include <asm/pgtable.h>
	31	#include <asm/system.h>
	32	#include <asm/processor.h>
	33	#include <asm/signal.h>
	34
	35	/* cpu depend functions */
	36	extern long h8300_get_reg(struct task_struct *task, int regno);
	37	extern int h8300_put_reg(struct task_struct *task, int regno, unsigned long data);
	38	extern void h8300_disable_trace(struct task_struct *child);
	39	extern void h8300_enable_trace(struct task_struct *child);
	40
	41	/*
	42	* does not yet catch signals sent when the child dies.
	43	* in exit.c or in signal.c.
	44	*/
	45
	46	inline
	47	static int read_long(struct task_struct * tsk, unsigned long addr,
	48	unsigned long * result)
	49	{
	50	result = (unsigned long *)addr;
	51	return 0;
	52	}
	53
	54	void ptrace_disable(struct task_struct *child)
	55	{
	56	h8300_disable_trace(child);
	57	}
	58
481bed45	59	long arch_ptrace(struct task_struct *child, long request, long addr, long data)
1da177e4	60	{
1da177e4 LT	61	int ret;
1da177e4 LT	62
1da177e4 LT	63	switch (request) {
	64	case PTRACE_PEEKTEXT: /* read word at location addr. */
	65	case PTRACE_PEEKDATA: {
	66	unsigned long tmp;
	67
	68	ret = read_long(child, addr, &tmp);
	69	if (ret < 0)
	70	break ;
	71	ret = put_user(tmp, (unsigned long *) data);
	72	break ;
	73	}
	74
	75	/* read the word at location addr in the USER area. */
	76	case PTRACE_PEEKUSR: {
	77	unsigned long tmp = 0;
	78
	79	if ((addr & 3) \|\| addr < 0 \|\| addr >= sizeof(struct user)) {
	80	ret = -EIO;
	81	break ;
	82	}
	83
	84	ret = 0; /* Default return condition */
	85	addr = addr >> 2; /* temporary hack. */
	86
	87	if (addr < H8300_REGS_NO)
	88	tmp = h8300_get_reg(child, addr);
	89	else {
	90	switch(addr) {
	91	case 49:
	92	tmp = child->mm->start_code;
	93	break ;
	94	case 50:
	95	tmp = child->mm->start_data;
	96	break ;
	97	case 51:
	98	tmp = child->mm->end_code;
	99	break ;
	100	case 52:
	101	tmp = child->mm->end_data;
	102	break ;
	103	default:
	104	ret = -EIO;
	105	}
	106	}
	107	if (!ret)
	108	ret = put_user(tmp,(unsigned long *) data);
	109	break ;
	110	}
	111
	112	/* when I and D space are separate, this will have to be fixed. */
	113	case PTRACE_POKETEXT: /* write the word at location addr. */
	114	case PTRACE_POKEDATA:
	115	ret = 0;
	116	if (access_process_vm(child, addr, &data, sizeof(data), 1) == sizeof(data))
	117	break;
	118	ret = -EIO;
	119	break;
	120
	121	case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
	122	if ((addr & 3) \|\| addr < 0 \|\| addr >= sizeof(struct user)) {
	123	ret = -EIO;
	124	break ;
	125	}
	126	addr = addr >> 2; /* temporary hack. */
127
128	if (addr == PT_ORIG_ER0) {
129	ret = -EIO;
130	break ;
131	}
132	if (addr < H8300_REGS_NO) {
133	ret = h8300_put_reg(child, addr, data);
134	break ;
135	}
136	ret = -EIO;
137	break ;
138	case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
139	case PTRACE_CONT: { /* restart after signal. */
140	ret = -EIO;
7ed20e1a	141	if (!valid_signal(data))
1da177e4 LT	142	break ;
	143	if (request == PTRACE_SYSCALL)
	144	set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
	145	else
	146	clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
	147	child->exit_code = data;
	148	wake_up_process(child);
	149	/* make sure the single step bit is not set. */
	150	h8300_disable_trace(child);
	151	ret = 0;
	152	}
	153
	154	/*
	155	* make the child exit. Best I can do is send it a sigkill.
	156	* perhaps it should be put in the status that it wants to
	157	* exit.
	158	*/
	159	case PTRACE_KILL: {
	160
	161	ret = 0;
	162	if (child->exit_state == EXIT_ZOMBIE) /* already dead */
	163	break;
	164	child->exit_code = SIGKILL;
	165	h8300_disable_trace(child);
	166	wake_up_process(child);
	167	break;
	168	}
	169
	170	case PTRACE_SINGLESTEP: { /* set the trap flag. */
	171	ret = -EIO;
7ed20e1a	172	if (!valid_signal(data))
1da177e4 LT	173	break;
	174	clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
	175	child->exit_code = data;
	176	h8300_enable_trace(child);
	177	wake_up_process(child);
	178	ret = 0;
	179	break;
	180	}
	181
	182	case PTRACE_DETACH: /* detach a process that was attached. */
	183	ret = ptrace_detach(child, data);
	184	break;
	185
	186	case PTRACE_GETREGS: { /* Get all gp regs from the child. */
	187	int i;
	188	unsigned long tmp;
	189	for (i = 0; i < H8300_REGS_NO; i++) {
	190	tmp = h8300_get_reg(child, i);
	191	if (put_user(tmp, (unsigned long *) data)) {
	192	ret = -EFAULT;
	193	break;
	194	}
	195	data += sizeof(long);
	196	}
	197	ret = 0;
	198	break;
	199	}
	200
	201	case PTRACE_SETREGS: { /* Set all gp regs in the child. */
	202	int i;
	203	unsigned long tmp;
	204	for (i = 0; i < H8300_REGS_NO; i++) {
	205	if (get_user(tmp, (unsigned long *) data)) {
	206	ret = -EFAULT;
	207	break;
	208	}
	209	h8300_put_reg(child, i, tmp);
	210	data += sizeof(long);
	211	}
	212	ret = 0;
	213	break;
	214	}
	215
	216	default:
	217	ret = -EIO;
	218	break;
	219	}
1da177e4 LT	220	return ret;
	221	}
	222
	223	asmlinkage void syscall_trace(void)
	224	{
	225	if (!test_thread_flag(TIF_SYSCALL_TRACE))
	226	return;
	227	if (!(current->ptrace & PT_PTRACED))
	228	return;
	229	ptrace_notify(SIGTRAP \| ((current->ptrace & PT_TRACESYSGOOD)
	230	? 0x80 : 0));
	231	/*
	232	* this isn't the same as continuing with a signal, but it will do
	233	* for normal use. strace only continues with a signal if the
	234	* stopping signal is not SIGTRAP. -brl
	235	*/
	236	if (current->exit_code) {
	237	send_sig(current->exit_code, current, 1);
	238	current->exit_code = 0;
	239	}
	240	}