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

/*
 * Copyright 2010 Tilera Corporation. All Rights Reserved.
 *
 *   This program is free software; you can redistribute it and/or
 *   modify it under the terms of the GNU General Public License
 *   as published by the Free Software Foundation, version 2.
 *
 *   This program is distributed in the hope that it will be useful, but
 *   WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
 *   NON INFRINGEMENT.  See the GNU General Public License for
 *   more details.
 *
 * Copied from i386: Ross Biro 1/23/92
 */

#include <linux/kernel.h>
#include <linux/ptrace.h>
#include <linux/kprobes.h>
#include <linux/compat.h>
#include <linux/uaccess.h>
#include <asm/traps.h>

void user_enable_single_step(struct task_struct *child)
{
	set_tsk_thread_flag(child, TIF_SINGLESTEP);
}

void user_disable_single_step(struct task_struct *child)
{
	clear_tsk_thread_flag(child, TIF_SINGLESTEP);
}

/*
 * Called by kernel/ptrace.c when detaching..
 */
void ptrace_disable(struct task_struct *child)
{
	clear_tsk_thread_flag(child, TIF_SINGLESTEP);

	/*
	 * These two are currently unused, but will be set by arch_ptrace()
	 * and used in the syscall assembly when we do support them.
	 */
	clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
}

long arch_ptrace(struct task_struct *child, long request, long addr, long data)
{
	unsigned long __user *datap = (long __user __force *)data;
	unsigned long tmp;
	int i;
	long ret = -EIO;
	unsigned long *childregs;
	char *childreg;

	switch (request) {

	case PTRACE_PEEKUSR:  /* Read register from pt_regs. */
		if (addr < 0 || addr >= PTREGS_SIZE)
			break;
		childreg = (char *)task_pt_regs(child) + addr;
#ifdef CONFIG_COMPAT
		if (is_compat_task()) {
			if (addr & (sizeof(compat_long_t)-1))
				break;
			ret = put_user(*(compat_long_t *)childreg,
				       (compat_long_t __user *)datap);
		} else
#endif
		{
			if (addr & (sizeof(long)-1))
				break;
			ret = put_user(*(long *)childreg, datap);
		}
		break;

	case PTRACE_POKEUSR:  /* Write register in pt_regs. */
		if (addr < 0 || addr >= PTREGS_SIZE)
			break;
		childreg = (char *)task_pt_regs(child) + addr;
#ifdef CONFIG_COMPAT
		if (is_compat_task()) {
			if (addr & (sizeof(compat_long_t)-1))
				break;
			*(compat_long_t *)childreg = data;
		} else
#endif
		{
			if (addr & (sizeof(long)-1))
				break;
			*(long *)childreg = data;
		}
		ret = 0;
		break;

	case PTRACE_GETREGS:  /* Get all registers from the child. */
		if (!access_ok(VERIFY_WRITE, datap, PTREGS_SIZE))
			break;
		childregs = (long *)task_pt_regs(child);
		for (i = 0; i < sizeof(struct pt_regs)/sizeof(long); ++i) {
			ret = __put_user(childregs[i], &datap[i]);
			if (ret != 0)
				break;
		}
		break;

	case PTRACE_SETREGS:  /* Set all registers in the child. */
		if (!access_ok(VERIFY_READ, datap, PTREGS_SIZE))
			break;
		childregs = (long *)task_pt_regs(child);
		for (i = 0; i < sizeof(struct pt_regs)/sizeof(long); ++i) {
			ret = __get_user(childregs[i], &datap[i]);
			if (ret != 0)
				break;
		}
		break;

	case PTRACE_GETFPREGS:  /* Get the child FPU state. */
	case PTRACE_SETFPREGS:  /* Set the child FPU state. */
		break;

	case PTRACE_SETOPTIONS:
		/* Support TILE-specific ptrace options. */
		child->ptrace &= ~PT_TRACE_MASK_TILE;
		tmp = data & PTRACE_O_MASK_TILE;
		data &= ~PTRACE_O_MASK_TILE;
		ret = ptrace_request(child, request, addr, data);
		if (tmp & PTRACE_O_TRACEMIGRATE)
			child->ptrace |= PT_TRACE_MIGRATE;
		break;

	default:
#ifdef CONFIG_COMPAT
		if (task_thread_info(current)->status & TS_COMPAT) {
			ret = compat_ptrace_request(child, request,
						    addr, data);
			break;
		}
#endif
		ret = ptrace_request(child, request, addr, data);
		break;
	}

	return ret;
}

#ifdef CONFIG_COMPAT
/* Not used; we handle compat issues in arch_ptrace() directly. */
long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
			       compat_ulong_t addr, compat_ulong_t data)
{
	BUG();
}
#endif

void do_syscall_trace(void)
{
	if (!test_thread_flag(TIF_SYSCALL_TRACE))
		return;

	if (!(current->ptrace & PT_PTRACED))
		return;

	/*
	 * The 0x80 provides a way for the tracing parent to distinguish
	 * between a syscall stop and SIGTRAP delivery
	 */
	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;
	}
}

void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs, int error_code)
{
	struct siginfo info;

	memset(&info, 0, sizeof(info));
	info.si_signo = SIGTRAP;
	info.si_code  = TRAP_BRKPT;
	info.si_addr  = (void __user *) regs->pc;

	/* Send us the fakey SIGTRAP */
	force_sig_info(SIGTRAP, &info, tsk);
}

/* Handle synthetic interrupt delivered only by the simulator. */
void __kprobes do_breakpoint(struct pt_regs* regs, int fault_num)
{
	send_sigtrap(current, regs, fault_num);
}
Commit	Line	Data
867e359b CM	1	/*
	2	* Copyright 2010 Tilera Corporation. All Rights Reserved.
	3	*
	4	* This program is free software; you can redistribute it and/or
	5	* modify it under the terms of the GNU General Public License
	6	* as published by the Free Software Foundation, version 2.
	7	*
	8	* This program is distributed in the hope that it will be useful, but
	9	* WITHOUT ANY WARRANTY; without even the implied warranty of
	10	* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
	11	* NON INFRINGEMENT. See the GNU General Public License for
	12	* more details.
	13	*
	14	* Copied from i386: Ross Biro 1/23/92
	15	*/
	16
	17	#include <linux/kernel.h>
	18	#include <linux/ptrace.h>
	19	#include <linux/kprobes.h>
	20	#include <linux/compat.h>
	21	#include <linux/uaccess.h>
0707ad30	22	#include <asm/traps.h>
867e359b CM	23
	24	void user_enable_single_step(struct task_struct *child)
	25	{
	26	set_tsk_thread_flag(child, TIF_SINGLESTEP);
	27	}
	28
	29	void user_disable_single_step(struct task_struct *child)
	30	{
	31	clear_tsk_thread_flag(child, TIF_SINGLESTEP);
	32	}
	33
867e359b CM	34	/*
	35	* Called by kernel/ptrace.c when detaching..
	36	*/
	37	void ptrace_disable(struct task_struct *child)
	38	{
	39	clear_tsk_thread_flag(child, TIF_SINGLESTEP);
	40
	41	/*
	42	* These two are currently unused, but will be set by arch_ptrace()
	43	* and used in the syscall assembly when we do support them.
	44	*/
	45	clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
	46	}
	47
	48	long arch_ptrace(struct task_struct *child, long request, long addr, long data)
	49	{
ce7f2a39	50	unsigned long __user datap = (long __user __force )data;
867e359b CM	51	unsigned long tmp;
	52	int i;
	53	long ret = -EIO;
ce7f2a39 CM	54	unsigned long *childregs;
ce7f2a39 CM	55	char *childreg;
867e359b CM	56
	57	switch (request) {
	58
	59	case PTRACE_PEEKUSR: /* Read register from pt_regs. */
867e359b CM	60	if (addr < 0 \|\| addr >= PTREGS_SIZE)
867e359b CM	61	break;
ce7f2a39 CM	62	childreg = (char *)task_pt_regs(child) + addr;
	63	#ifdef CONFIG_COMPAT
	64	if (is_compat_task()) {
	65	if (addr & (sizeof(compat_long_t)-1))
	66	break;
	67	ret = put_user((compat_long_t )childreg,
	68	(compat_long_t __user *)datap);
	69	} else
	70	#endif
	71	{
	72	if (addr & (sizeof(long)-1))
	73	break;
	74	ret = put_user((long )childreg, datap);
	75	}
867e359b CM	76	break;
	77
	78	case PTRACE_POKEUSR: /* Write register in pt_regs. */
867e359b CM	79	if (addr < 0 \|\| addr >= PTREGS_SIZE)
867e359b CM	80	break;
ce7f2a39 CM	81	childreg = (char *)task_pt_regs(child) + addr;
	82	#ifdef CONFIG_COMPAT
	83	if (is_compat_task()) {
	84	if (addr & (sizeof(compat_long_t)-1))
	85	break;
	86	(compat_long_t )childreg = data;
	87	} else
	88	#endif
	89	{
	90	if (addr & (sizeof(long)-1))
	91	break;
	92	(long )childreg = data;
	93	}
bcd97c3f	94	ret = 0;
867e359b CM	95	break;
	96
	97	case PTRACE_GETREGS: /* Get all registers from the child. */
	98	if (!access_ok(VERIFY_WRITE, datap, PTREGS_SIZE))
	99	break;
ce7f2a39 CM	100	childregs = (long *)task_pt_regs(child);
	101	for (i = 0; i < sizeof(struct pt_regs)/sizeof(long); ++i) {
	102	ret = __put_user(childregs[i], &datap[i]);
867e359b CM	103	if (ret != 0)
867e359b CM	104	break;
867e359b CM	105	}
	106	break;
	107
	108	case PTRACE_SETREGS: /* Set all registers in the child. */
	109	if (!access_ok(VERIFY_READ, datap, PTREGS_SIZE))
	110	break;
ce7f2a39 CM	111	childregs = (long *)task_pt_regs(child);
	112	for (i = 0; i < sizeof(struct pt_regs)/sizeof(long); ++i) {
	113	ret = __get_user(childregs[i], &datap[i]);
867e359b CM	114	if (ret != 0)
867e359b CM	115	break;
867e359b CM	116	}
	117	break;
	118
	119	case PTRACE_GETFPREGS: /* Get the child FPU state. */
	120	case PTRACE_SETFPREGS: /* Set the child FPU state. */
	121	break;
	122
	123	case PTRACE_SETOPTIONS:
	124	/* Support TILE-specific ptrace options. */
	125	child->ptrace &= ~PT_TRACE_MASK_TILE;
	126	tmp = data & PTRACE_O_MASK_TILE;
	127	data &= ~PTRACE_O_MASK_TILE;
	128	ret = ptrace_request(child, request, addr, data);
	129	if (tmp & PTRACE_O_TRACEMIGRATE)
	130	child->ptrace \|= PT_TRACE_MIGRATE;
	131	break;
	132
	133	default:
	134	#ifdef CONFIG_COMPAT
	135	if (task_thread_info(current)->status & TS_COMPAT) {
	136	ret = compat_ptrace_request(child, request,
	137	addr, data);
	138	break;
	139	}
	140	#endif
	141	ret = ptrace_request(child, request, addr, data);
	142	break;
	143	}
	144
	145	return ret;
	146	}
	147
	148	#ifdef CONFIG_COMPAT
	149	/* Not used; we handle compat issues in arch_ptrace() directly. */
	150	long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
	151	compat_ulong_t addr, compat_ulong_t data)
	152	{
	153	BUG();
	154	}
	155	#endif
	156
	157	void do_syscall_trace(void)
	158	{
	159	if (!test_thread_flag(TIF_SYSCALL_TRACE))
	160	return;
	161
	162	if (!(current->ptrace & PT_PTRACED))
	163	return;
	164
	165	/*
	166	* The 0x80 provides a way for the tracing parent to distinguish
	167	* between a syscall stop and SIGTRAP delivery
	168	*/
	169	ptrace_notify(SIGTRAP\|((current->ptrace & PT_TRACESYSGOOD) ? 0x80 : 0));
	170
	171	/*
	172	* this isn't the same as continuing with a signal, but it will do
	173	* for normal use. strace only continues with a signal if the
	174	* stopping signal is not SIGTRAP. -brl
	175	*/
	176	if (current->exit_code) {
	177	send_sig(current->exit_code, current, 1);
	178	current->exit_code = 0;
	179	}
180	}
181
182	void send_sigtrap(struct task_struct tsk, struct pt_regs regs, int error_code)
183	{
184	struct siginfo info;
185
186	memset(&info, 0, sizeof(info));
187	info.si_signo = SIGTRAP;
188	info.si_code = TRAP_BRKPT;
189	info.si_addr = (void __user *) regs->pc;
190
191	/* Send us the fakey SIGTRAP */
192	force_sig_info(SIGTRAP, &info, tsk);
193	}
194
195	/* Handle synthetic interrupt delivered only by the simulator. */
196	void __kprobes do_breakpoint(struct pt_regs* regs, int fault_num)
197	{
198	send_sigtrap(current, regs, fault_num);
199	}