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

/*
 * File:         arch/blackfin/kernel/ptrace.c
 * Based on:     Taken from linux/kernel/ptrace.c
 * Author:       linux/kernel/ptrace.c is by Ross Biro 1/23/92, edited by Linus Torvalds
 *
 * Created:      1/23/92
 * Description:
 *
 * Modified:
 *               Copyright 2004-2006 Analog Devices Inc.
 *
 * Bugs:         Enter bugs at http://blackfin.uclinux.org/
 *
 * 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; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see the file COPYING, or write
 * to the Free Software Foundation, Inc.,
 * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#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 <linux/uaccess.h>

#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/system.h>
#include <asm/processor.h>
#include <asm/asm-offsets.h>
#include <asm/dma.h>
#include <asm/fixed_code.h>
#include <asm/cacheflush.h>
#include <asm/mem_map.h>

#define TEXT_OFFSET 0
/*
 * does not yet catch signals sent when the child dies.
 * in exit.c or in signal.c.
 */

/* determines which bits in the SYSCFG reg the user has access to. */
/* 1 = access 0 = no access */
#define SYSCFG_MASK 0x0007	/* SYSCFG reg */
/* sets the trace bits. */
#define TRACE_BITS 0x0001

/* Find the stack offset for a register, relative to thread.esp0. */
#define PT_REG(reg)	((long)&((struct pt_regs *)0)->reg)

/*
 * Get the address of the live pt_regs for the specified task.
 * These are saved onto the top kernel stack when the process
 * is not running.
 *
 * Note: if a user thread is execve'd from kernel space, the
 * kernel stack will not be empty on entry to the kernel, so
 * ptracing these tasks will fail.
 */
static inline struct pt_regs *get_user_regs(struct task_struct *task)
{
	return (struct pt_regs *)
	    ((unsigned long)task_stack_page(task) +
	     (THREAD_SIZE - sizeof(struct pt_regs)));
}

/*
 * Get all user integer registers.
 */
static inline int ptrace_getregs(struct task_struct *tsk, void __user *uregs)
{
	struct pt_regs regs;
	memcpy(&regs, get_user_regs(tsk), sizeof(regs));
	regs.usp = tsk->thread.usp;
	return copy_to_user(uregs, &regs, sizeof(struct pt_regs)) ? -EFAULT : 0;
}

/* 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).
 */

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

	struct pt_regs *regs =
	    (struct pt_regs *)((unsigned long)task_stack_page(task) +
			       (THREAD_SIZE - sizeof(struct pt_regs)));
	reg_ptr = (char *)regs;

	switch (regno) {
	case PT_USP:
		return task->thread.usp;
	default:
		if (regno <= 216)
			return *(long *)(reg_ptr + regno);
	}
	/* slight mystery ... never seems to come here but kernel misbehaves without this code! */

	printk(KERN_WARNING "Request to get for unknown register %d\n", regno);
	return 0;
}

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

	struct pt_regs *regs =
	    (struct pt_regs *)((unsigned long)task_stack_page(task) +
			       (THREAD_SIZE - sizeof(struct pt_regs)));
	reg_ptr = (char *)regs;

	switch (regno) {
	case PT_PC:
		/*********************************************************************/
		/* At this point the kernel is most likely in exception.             */
		/* The RETX register will be used to populate the pc of the process. */
		/*********************************************************************/
		regs->retx = data;
		regs->pc = data;
		break;
	case PT_RETX:
		break;		/* regs->retx = data; break; */
	case PT_USP:
		regs->usp = data;
		task->thread.usp = data;
		break;
	default:
		if (regno <= 216)
			*(long *)(reg_ptr + regno) = data;
	}
	return 0;
}

/*
 * check that an address falls within the bounds of the target process's memory mappings
 */
static inline int is_user_addr_valid(struct task_struct *child,
				     unsigned long start, unsigned long len)
{
	struct vm_area_struct *vma;
	struct sram_list_struct *sraml;

	/* overflow */
	if (start + len < start)
		return -EIO;

	vma = find_vma(child->mm, start);
	if (vma && start >= vma->vm_start && start + len <= vma->vm_end)
			return 0;

	for (sraml = child->mm->context.sram_list; sraml; sraml = sraml->next)
		if (start >= (unsigned long)sraml->addr
		    && start + len < (unsigned long)sraml->addr + sraml->length)
			return 0;

	if (start >= FIXED_CODE_START && start + len < FIXED_CODE_END)
		return 0;

	return -EIO;
}

void ptrace_enable(struct task_struct *child)
{
	unsigned long tmp;
	tmp = get_reg(child, PT_SYSCFG) | (TRACE_BITS);
	put_reg(child, PT_SYSCFG, tmp);
}

/*
 * Called by kernel/ptrace.c when detaching..
 *
 * Make sure the single step bit is not set.
 */
void ptrace_disable(struct task_struct *child)
{
	unsigned long tmp;
	/* make sure the single step bit is not set. */
	tmp = get_reg(child, PT_SYSCFG) & ~TRACE_BITS;
	put_reg(child, PT_SYSCFG, tmp);
}

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

	switch (request) {
		/* when I and D space are separate, these will need to be fixed. */
	case PTRACE_PEEKDATA:
		pr_debug("ptrace: PEEKDATA\n");
		/* fall through */
	case PTRACE_PEEKTEXT:	/* read word at location addr. */
		{
			unsigned long tmp = 0;
			int copied;

			ret = -EIO;
			pr_debug("ptrace: PEEKTEXT at addr 0x%08lx + %ld\n", addr, sizeof(data));
			if (is_user_addr_valid(child, addr, sizeof(tmp)) < 0)
				break;
			pr_debug("ptrace: user address is valid\n");

			if (L1_CODE_LENGTH != 0 && addr >= get_l1_code_start()
			    && addr + sizeof(tmp) <= get_l1_code_start() + L1_CODE_LENGTH) {
				safe_dma_memcpy (&tmp, (const void *)(addr), sizeof(tmp));
				copied = sizeof(tmp);

			} else if (L1_DATA_A_LENGTH != 0 && addr >= L1_DATA_A_START
			    && addr + sizeof(tmp) <= L1_DATA_A_START + L1_DATA_A_LENGTH) {
				memcpy(&tmp, (const void *)(addr), sizeof(tmp));
				copied = sizeof(tmp);

			} else if (L1_DATA_B_LENGTH != 0 && addr >= L1_DATA_B_START
			    && addr + sizeof(tmp) <= L1_DATA_B_START + L1_DATA_B_LENGTH) {
				memcpy(&tmp, (const void *)(addr), sizeof(tmp));
				copied = sizeof(tmp);

			} else if (addr >= FIXED_CODE_START
			    && addr + sizeof(tmp) <= FIXED_CODE_END) {
				copy_from_user_page(0, 0, 0, &tmp, (const void *)(addr), sizeof(tmp));
				copied = sizeof(tmp);

			} else
				copied = access_process_vm(child, addr, &tmp,
							   sizeof(tmp), 0);

			pr_debug("ptrace: copied size %d [0x%08lx]\n", copied, tmp);
			if (copied != sizeof(tmp))
				break;
			ret = put_user(tmp, datap);
			break;
		}

		/* read the word at location addr in the USER area. */
	case PTRACE_PEEKUSR:
		{
			unsigned long tmp;
			ret = -EIO;
			tmp = 0;
			if ((addr & 3) || (addr > (sizeof(struct pt_regs) + 16))) {
				printk(KERN_WARNING "ptrace error : PEEKUSR : temporarily returning "
				                    "0 - %x sizeof(pt_regs) is %lx\n",
				     (int)addr, sizeof(struct pt_regs));
				break;
			}
			if (addr == sizeof(struct pt_regs)) {
				/* PT_TEXT_ADDR */
				tmp = child->mm->start_code + TEXT_OFFSET;
			} else if (addr == (sizeof(struct pt_regs) + 4)) {
				/* PT_TEXT_END_ADDR */
				tmp = child->mm->end_code;
			} else if (addr == (sizeof(struct pt_regs) + 8)) {
				/* PT_DATA_ADDR */
				tmp = child->mm->start_data;
#ifdef CONFIG_BINFMT_ELF_FDPIC
			} else if (addr == (sizeof(struct pt_regs) + 12)) {
				tmp = child->mm->context.exec_fdpic_loadmap;
			} else if (addr == (sizeof(struct pt_regs) + 16)) {
				tmp = child->mm->context.interp_fdpic_loadmap;
#endif
			} else {
				tmp = get_reg(child, addr);
			}
			ret = put_user(tmp, datap);
			break;
		}

		/* when I and D space are separate, this will have to be fixed. */
	case PTRACE_POKEDATA:
		pr_debug("ptrace: PTRACE_PEEKDATA\n");
		/* fall through */
	case PTRACE_POKETEXT:	/* write the word at location addr. */
		{
			int copied;

			ret = -EIO;
			pr_debug("ptrace: POKETEXT at addr 0x%08lx + %ld bytes %lx\n",
			         addr, sizeof(data), data);
			if (is_user_addr_valid(child, addr, sizeof(data)) < 0)
				break;
			pr_debug("ptrace: user address is valid\n");

			if (L1_CODE_LENGTH != 0 && addr >= get_l1_code_start()
			    && addr + sizeof(data) <= get_l1_code_start() + L1_CODE_LENGTH) {
				safe_dma_memcpy ((void *)(addr), &data, sizeof(data));
				copied = sizeof(data);

			} else if (L1_DATA_A_LENGTH != 0 && addr >= L1_DATA_A_START
			    && addr + sizeof(data) <= L1_DATA_A_START + L1_DATA_A_LENGTH) {
				memcpy((void *)(addr), &data, sizeof(data));
				copied = sizeof(data);

			} else if (L1_DATA_B_LENGTH != 0 && addr >= L1_DATA_B_START
			    && addr + sizeof(data) <= L1_DATA_B_START + L1_DATA_B_LENGTH) {
				memcpy((void *)(addr), &data, sizeof(data));
				copied = sizeof(data);

			} else if (addr >= FIXED_CODE_START
			    && addr + sizeof(data) <= FIXED_CODE_END) {
				copy_to_user_page(0, 0, 0, (void *)(addr), &data, sizeof(data));
				copied = sizeof(data);

			} else
				copied = access_process_vm(child, addr, &data,
							   sizeof(data), 1);

			pr_debug("ptrace: copied size %d\n", copied);
			if (copied != sizeof(data))
				break;
			ret = 0;
			break;
		}

	case PTRACE_POKEUSR:	/* write the word at location addr in the USER area */
		ret = -EIO;
		if ((addr & 3) || (addr > (sizeof(struct pt_regs) + 16))) {
			printk(KERN_WARNING "ptrace error : POKEUSR: temporarily returning 0\n");
			break;
		}

		if (addr >= (sizeof(struct pt_regs))) {
			ret = 0;
			break;
		}
		if (addr == PT_SYSCFG) {
			data &= SYSCFG_MASK;
			data |= get_reg(child, PT_SYSCFG);
		}
		ret = put_reg(child, addr, data);
		break;

	case PTRACE_SYSCALL:	/* continue and stop at next (return from) syscall */
	case PTRACE_CONT:	/* restart after signal. */
		pr_debug("ptrace: syscall/cont\n");

		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;
		ptrace_disable(child);
		pr_debug("ptrace: before wake_up_process\n");
		wake_up_process(child);
		ret = 0;
		break;

	/*
	 * 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;
		ptrace_disable(child);
		wake_up_process(child);
		break;

	case PTRACE_SINGLESTEP:	/* set the trap flag. */
		pr_debug("ptrace: single step\n");
		ret = -EIO;
		if (!valid_signal(data))
			break;
		clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
		ptrace_enable(child);
		child->exit_code = data;
		wake_up_process(child);
		ret = 0;
		break;

	case PTRACE_GETREGS:
		/* Get all gp regs from the child. */
		ret = ptrace_getregs(child, datap);
		break;

	case PTRACE_SETREGS:
		printk(KERN_WARNING "ptrace: SETREGS: **** NOT IMPLEMENTED ***\n");
		/* Set all gp regs in the child. */
		ret = 0;
		break;

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

	return ret;
}

asmlinkage void 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;
	}
}
Commit	Line	Data
1394f032 BW	1	/*
	2	* File: arch/blackfin/kernel/ptrace.c
	3	* Based on: Taken from linux/kernel/ptrace.c
	4	* Author: linux/kernel/ptrace.c is by Ross Biro 1/23/92, edited by Linus Torvalds
	5	*
	6	* Created: 1/23/92
	7	* Description:
	8	*
	9	* Modified:
	10	* Copyright 2004-2006 Analog Devices Inc.
	11	*
	12	* Bugs: Enter bugs at http://blackfin.uclinux.org/
	13	*
	14	* This program is free software; you can redistribute it and/or modify
	15	* it under the terms of the GNU General Public License as published by
	16	* the Free Software Foundation; either version 2 of the License, or
	17	* (at your option) any later version.
	18	*
	19	* This program is distributed in the hope that it will be useful,
	20	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	21	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	22	* GNU General Public License for more details.
	23	*
	24	* You should have received a copy of the GNU General Public License
	25	* along with this program; if not, see the file COPYING, or write
	26	* to the Free Software Foundation, Inc.,
	27	* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	28	*/
	29
	30	#include <linux/kernel.h>
	31	#include <linux/sched.h>
	32	#include <linux/mm.h>
	33	#include <linux/smp.h>
	34	#include <linux/smp_lock.h>
	35	#include <linux/errno.h>
	36	#include <linux/ptrace.h>
	37	#include <linux/user.h>
	38	#include <linux/signal.h>
1f83b8f1	39	#include <linux/uaccess.h>
1394f032	40
1394f032 BW	41	#include <asm/page.h>
	42	#include <asm/pgtable.h>
	43	#include <asm/system.h>
	44	#include <asm/processor.h>
	45	#include <asm/asm-offsets.h>
	46	#include <asm/dma.h>
26156397	47	#include <asm/fixed_code.h>
7786ce82	48	#include <asm/cacheflush.h>
dbc895f9	49	#include <asm/mem_map.h>
1394f032	50
1394f032 BW	51	#define TEXT_OFFSET 0
	52	/*
	53	* does not yet catch signals sent when the child dies.
	54	* in exit.c or in signal.c.
	55	*/
	56
	57	/* determines which bits in the SYSCFG reg the user has access to. */
	58	/* 1 = access 0 = no access */
	59	#define SYSCFG_MASK 0x0007 /* SYSCFG reg */
	60	/* sets the trace bits. */
	61	#define TRACE_BITS 0x0001
	62
	63	/* Find the stack offset for a register, relative to thread.esp0. */
	64	#define PT_REG(reg) ((long)&((struct pt_regs *)0)->reg)
	65
	66	/*
	67	* Get the address of the live pt_regs for the specified task.
	68	* These are saved onto the top kernel stack when the process
	69	* is not running.
	70	*
	71	* Note: if a user thread is execve'd from kernel space, the
	72	* kernel stack will not be empty on entry to the kernel, so
	73	* ptracing these tasks will fail.
	74	*/
	75	static inline struct pt_regs get_user_regs(struct task_struct task)
	76	{
	77	return (struct pt_regs *)
f7e4217b	78	((unsigned long)task_stack_page(task) +
1394f032 BW	79	(THREAD_SIZE - sizeof(struct pt_regs)));
	80	}
	81
	82	/*
	83	* Get all user integer registers.
	84	*/
8a86176c	85	static inline int ptrace_getregs(struct task_struct tsk, void __user uregs)
1394f032	86	{
8a86176c MF	87	struct pt_regs regs;
	88	memcpy(&regs, get_user_regs(tsk), sizeof(regs));
	89	regs.usp = tsk->thread.usp;
	90	return copy_to_user(uregs, &regs, sizeof(struct pt_regs)) ? -EFAULT : 0;
1394f032 BW	91	}
	92
	93	/* Mapping from PT_xxx to the stack offset at which the register is
	94	* saved. Notice that usp has no stack-slot and needs to be treated
	95	* specially (see get_reg/put_reg below).
	96	*/
	97
	98	/*
	99	* Get contents of register REGNO in task TASK.
	100	*/
	101	static inline long get_reg(struct task_struct *task, int regno)
	102	{
	103	unsigned char *reg_ptr;
	104
	105	struct pt_regs *regs =
f7e4217b	106	(struct pt_regs *)((unsigned long)task_stack_page(task) +
1394f032 BW	107	(THREAD_SIZE - sizeof(struct pt_regs)));
	108	reg_ptr = (char *)regs;
	109
	110	switch (regno) {
	111	case PT_USP:
	112	return task->thread.usp;
	113	default:
	114	if (regno <= 216)
	115	return (long )(reg_ptr + regno);
	116	}
	117	/* slight mystery ... never seems to come here but kernel misbehaves without this code! */
	118
	119	printk(KERN_WARNING "Request to get for unknown register %d\n", regno);
	120	return 0;
	121	}
	122
	123	/*
	124	* Write contents of register REGNO in task TASK.
	125	*/
	126	static inline int
	127	put_reg(struct task_struct *task, int regno, unsigned long data)
	128	{
1f83b8f1	129	char *reg_ptr;
1394f032 BW	130
1394f032 BW	131	struct pt_regs *regs =
f7e4217b	132	(struct pt_regs *)((unsigned long)task_stack_page(task) +
1394f032 BW	133	(THREAD_SIZE - sizeof(struct pt_regs)));
	134	reg_ptr = (char *)regs;
	135
	136	switch (regno) {
	137	case PT_PC:
	138	/*********************************************************************/
	139	/* At this point the kernel is most likely in exception. */
	140	/* The RETX register will be used to populate the pc of the process. */
	141	/*********************************************************************/
	142	regs->retx = data;
	143	regs->pc = data;
	144	break;
	145	case PT_RETX:
	146	break; /* regs->retx = data; break; */
	147	case PT_USP:
	148	regs->usp = data;
	149	task->thread.usp = data;
	150	break;
	151	default:
	152	if (regno <= 216)
1f83b8f1	153	(long )(reg_ptr + regno) = data;
1394f032 BW	154	}
	155	return 0;
	156	}
	157
	158	/*
	159	* check that an address falls within the bounds of the target process's memory mappings
	160	*/
	161	static inline int is_user_addr_valid(struct task_struct *child,
	162	unsigned long start, unsigned long len)
	163	{
8feae131	164	struct vm_area_struct *vma;
1394f032 BW	165	struct sram_list_struct *sraml;
1394f032 BW	166
3c08f1d1 MF	167	/* overflow */
	168	if (start + len < start)
	169	return -EIO;
	170
8feae131 DH	171	vma = find_vma(child->mm, start);
8feae131 DH	172	if (vma && start >= vma->vm_start && start + len <= vma->vm_end)
1394f032 BW	173	return 0;
	174
	175	for (sraml = child->mm->context.sram_list; sraml; sraml = sraml->next)
	176	if (start >= (unsigned long)sraml->addr
d207a8c7	177	&& start + len < (unsigned long)sraml->addr + sraml->length)
1394f032 BW	178	return 0;
1394f032 BW	179
d207a8c7	180	if (start >= FIXED_CODE_START && start + len < FIXED_CODE_END)
26156397 JZ	181	return 0;
26156397 JZ	182
1394f032 BW	183	return -EIO;
	184	}
	185
cb4c173d MF	186	void ptrace_enable(struct task_struct *child)
	187	{
	188	unsigned long tmp;
	189	tmp = get_reg(child, PT_SYSCFG) \| (TRACE_BITS);
	190	put_reg(child, PT_SYSCFG, tmp);
	191	}
	192
1394f032 BW	193	/*
	194	* Called by kernel/ptrace.c when detaching..
	195	*
	196	* Make sure the single step bit is not set.
	197	*/
	198	void ptrace_disable(struct task_struct *child)
	199	{
	200	unsigned long tmp;
	201	/* make sure the single step bit is not set. */
7d39270d BS	202	tmp = get_reg(child, PT_SYSCFG) & ~TRACE_BITS;
7d39270d BS	203	put_reg(child, PT_SYSCFG, tmp);
1394f032 BW	204	}
	205
	206	long arch_ptrace(struct task_struct *child, long request, long addr, long data)
	207	{
	208	int ret;
0ddeeca2	209	unsigned long __user datap = (unsigned long __user )data;
1394f032 BW	210
	211	switch (request) {
	212	/* when I and D space are separate, these will need to be fixed. */
	213	case PTRACE_PEEKDATA:
	214	pr_debug("ptrace: PEEKDATA\n");
1394f032 BW	215	/* fall through */
	216	case PTRACE_PEEKTEXT: /* read word at location addr. */
	217	{
	218	unsigned long tmp = 0;
	219	int copied;
	220
	221	ret = -EIO;
dabaad5b MF	222	pr_debug("ptrace: PEEKTEXT at addr 0x%08lx + %ld\n", addr, sizeof(data));
dabaad5b MF	223	if (is_user_addr_valid(child, addr, sizeof(tmp)) < 0)
1394f032 BW	224	break;
	225	pr_debug("ptrace: user address is valid\n");
	226
8f65873e GY	227	if (L1_CODE_LENGTH != 0 && addr >= get_l1_code_start()
8f65873e GY	228	&& addr + sizeof(tmp) <= get_l1_code_start() + L1_CODE_LENGTH) {
dabaad5b	229	safe_dma_memcpy (&tmp, (const void *)(addr), sizeof(tmp));
1394f032	230	copied = sizeof(tmp);
d207a8c7 MF	231
d207a8c7 MF	232	} else if (L1_DATA_A_LENGTH != 0 && addr >= L1_DATA_A_START
dabaad5b MF	233	&& addr + sizeof(tmp) <= L1_DATA_A_START + L1_DATA_A_LENGTH) {
dabaad5b MF	234	memcpy(&tmp, (const void *)(addr), sizeof(tmp));
6546eae4	235	copied = sizeof(tmp);
d207a8c7 MF	236
d207a8c7 MF	237	} else if (L1_DATA_B_LENGTH != 0 && addr >= L1_DATA_B_START
dabaad5b MF	238	&& addr + sizeof(tmp) <= L1_DATA_B_START + L1_DATA_B_LENGTH) {
dabaad5b MF	239	memcpy(&tmp, (const void *)(addr), sizeof(tmp));
6546eae4	240	copied = sizeof(tmp);
d207a8c7 MF	241
d207a8c7 MF	242	} else if (addr >= FIXED_CODE_START
dabaad5b	243	&& addr + sizeof(tmp) <= FIXED_CODE_END) {
7786ce82	244	copy_from_user_page(0, 0, 0, &tmp, (const void *)(addr), sizeof(tmp));
26156397	245	copied = sizeof(tmp);
d207a8c7	246
26156397	247	} else
dabaad5b	248	copied = access_process_vm(child, addr, &tmp,
26156397	249	sizeof(tmp), 0);
d207a8c7	250
1394f032 BW	251	pr_debug("ptrace: copied size %d [0x%08lx]\n", copied, tmp);
	252	if (copied != sizeof(tmp))
	253	break;
0ddeeca2	254	ret = put_user(tmp, datap);
1394f032 BW	255	break;
	256	}
	257
	258	/* read the word at location addr in the USER area. */
	259	case PTRACE_PEEKUSR:
	260	{
	261	unsigned long tmp;
	262	ret = -EIO;
	263	tmp = 0;
	264	if ((addr & 3) \|\| (addr > (sizeof(struct pt_regs) + 16))) {
	265	printk(KERN_WARNING "ptrace error : PEEKUSR : temporarily returning "
	266	"0 - %x sizeof(pt_regs) is %lx\n",
	267	(int)addr, sizeof(struct pt_regs));
	268	break;
	269	}
	270	if (addr == sizeof(struct pt_regs)) {
	271	/* PT_TEXT_ADDR */
	272	tmp = child->mm->start_code + TEXT_OFFSET;
	273	} else if (addr == (sizeof(struct pt_regs) + 4)) {
	274	/* PT_TEXT_END_ADDR */
	275	tmp = child->mm->end_code;
	276	} else if (addr == (sizeof(struct pt_regs) + 8)) {
	277	/* PT_DATA_ADDR */
	278	tmp = child->mm->start_data;
	279	#ifdef CONFIG_BINFMT_ELF_FDPIC
	280	} else if (addr == (sizeof(struct pt_regs) + 12)) {
	281	tmp = child->mm->context.exec_fdpic_loadmap;
	282	} else if (addr == (sizeof(struct pt_regs) + 16)) {
	283	tmp = child->mm->context.interp_fdpic_loadmap;
	284	#endif
	285	} else {
	286	tmp = get_reg(child, addr);
	287	}
0ddeeca2	288	ret = put_user(tmp, datap);
1394f032 BW	289	break;
	290	}
	291
	292	/* when I and D space are separate, this will have to be fixed. */
	293	case PTRACE_POKEDATA:
d3ab3a62	294	pr_debug("ptrace: PTRACE_PEEKDATA\n");
1394f032 BW	295	/* fall through */
	296	case PTRACE_POKETEXT: /* write the word at location addr. */
	297	{
	298	int copied;
	299
	300	ret = -EIO;
dabaad5b MF	301	pr_debug("ptrace: POKETEXT at addr 0x%08lx + %ld bytes %lx\n",
	302	addr, sizeof(data), data);
	303	if (is_user_addr_valid(child, addr, sizeof(data)) < 0)
1394f032 BW	304	break;
	305	pr_debug("ptrace: user address is valid\n");
	306
8f65873e GY	307	if (L1_CODE_LENGTH != 0 && addr >= get_l1_code_start()
8f65873e GY	308	&& addr + sizeof(data) <= get_l1_code_start() + L1_CODE_LENGTH) {
dabaad5b	309	safe_dma_memcpy ((void *)(addr), &data, sizeof(data));
1394f032	310	copied = sizeof(data);
d207a8c7 MF	311
d207a8c7 MF	312	} else if (L1_DATA_A_LENGTH != 0 && addr >= L1_DATA_A_START
dabaad5b MF	313	&& addr + sizeof(data) <= L1_DATA_A_START + L1_DATA_A_LENGTH) {
dabaad5b MF	314	memcpy((void *)(addr), &data, sizeof(data));
6546eae4	315	copied = sizeof(data);
d207a8c7 MF	316
d207a8c7 MF	317	} else if (L1_DATA_B_LENGTH != 0 && addr >= L1_DATA_B_START
dabaad5b MF	318	&& addr + sizeof(data) <= L1_DATA_B_START + L1_DATA_B_LENGTH) {
dabaad5b MF	319	memcpy((void *)(addr), &data, sizeof(data));
6546eae4	320	copied = sizeof(data);
d207a8c7 MF	321
d207a8c7 MF	322	} else if (addr >= FIXED_CODE_START
dabaad5b	323	&& addr + sizeof(data) <= FIXED_CODE_END) {
7786ce82	324	copy_to_user_page(0, 0, 0, (void *)(addr), &data, sizeof(data));
26156397	325	copied = sizeof(data);
d207a8c7	326
26156397	327	} else
dabaad5b	328	copied = access_process_vm(child, addr, &data,
26156397	329	sizeof(data), 1);
d207a8c7	330
1394f032 BW	331	pr_debug("ptrace: copied size %d\n", copied);
	332	if (copied != sizeof(data))
	333	break;
	334	ret = 0;
	335	break;
	336	}
	337
	338	case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
	339	ret = -EIO;
	340	if ((addr & 3) \|\| (addr > (sizeof(struct pt_regs) + 16))) {
	341	printk(KERN_WARNING "ptrace error : POKEUSR: temporarily returning 0\n");
	342	break;
	343	}
	344
	345	if (addr >= (sizeof(struct pt_regs))) {
	346	ret = 0;
	347	break;
	348	}
	349	if (addr == PT_SYSCFG) {
	350	data &= SYSCFG_MASK;
	351	data \|= get_reg(child, PT_SYSCFG);
	352	}
	353	ret = put_reg(child, addr, data);
	354	break;
	355
	356	case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
cb4c173d MF	357	case PTRACE_CONT: /* restart after signal. */
cb4c173d MF	358	pr_debug("ptrace: syscall/cont\n");
1394f032	359
cb4c173d MF	360	ret = -EIO;
cb4c173d MF	361	if (!valid_signal(data))
1394f032	362	break;
cb4c173d MF	363	if (request == PTRACE_SYSCALL)
	364	set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
	365	else
	366	clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
	367	child->exit_code = data;
	368	ptrace_disable(child);
	369	pr_debug("ptrace: before wake_up_process\n");
	370	wake_up_process(child);
	371	ret = 0;
	372	break;
1394f032 BW	373
	374	/*
	375	* make the child exit. Best I can do is send it a sigkill.
	376	* perhaps it should be put in the status that it wants to
	377	* exit.
	378	*/
	379	case PTRACE_KILL:
cb4c173d MF	380	ret = 0;
cb4c173d MF	381	if (child->exit_state == EXIT_ZOMBIE) /* already dead */
1394f032	382	break;
cb4c173d MF	383	child->exit_code = SIGKILL;
	384	ptrace_disable(child);
	385	wake_up_process(child);
	386	break;
1394f032	387
cb4c173d MF	388	case PTRACE_SINGLESTEP: /* set the trap flag. */
	389	pr_debug("ptrace: single step\n");
	390	ret = -EIO;
	391	if (!valid_signal(data))
1394f032	392	break;
cb4c173d MF	393	clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
	394	ptrace_enable(child);
	395	child->exit_code = data;
	396	wake_up_process(child);
	397	ret = 0;
	398	break;
1394f032	399
1394f032	400	case PTRACE_GETREGS:
d3ab3a62 MF	401	/* Get all gp regs from the child. */
	402	ret = ptrace_getregs(child, datap);
	403	break;
1394f032 BW	404
1394f032 BW	405	case PTRACE_SETREGS:
d3ab3a62 MF	406	printk(KERN_WARNING "ptrace: SETREGS: ** NOT IMPLEMENTED *\n");
	407	/* Set all gp regs in the child. */
	408	ret = 0;
	409	break;
	410
1394f032 BW	411	default:
	412	ret = ptrace_request(child, request, addr, data);
	413	break;
	414	}
	415
	416	return ret;
	417	}
	418
	419	asmlinkage void syscall_trace(void)
	420	{
1394f032 BW	421	if (!test_thread_flag(TIF_SYSCALL_TRACE))
	422	return;
	423
	424	if (!(current->ptrace & PT_PTRACED))
	425	return;
	426
	427	/* the 0x80 provides a way for the tracing parent to distinguish
	428	* between a syscall stop and SIGTRAP delivery
	429	*/
	430	ptrace_notify(SIGTRAP \| ((current->ptrace & PT_TRACESYSGOOD)
	431	? 0x80 : 0));
	432
	433	/*
	434	* this isn't the same as continuing with a signal, but it will do
	435	* for normal use. strace only continues with a signal if the
	436	* stopping signal is not SIGTRAP. -brl
	437	*/
	438	if (current->exit_code) {
	439	send_sig(current->exit_code, current, 1);
	440	current->exit_code = 0;
	441	}
	442	}