[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>

#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 = get_user_regs(tsk);
	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_list_struct *vml;
	struct sram_list_struct *sraml;

	for (vml = child->mm->context.vmlist; vml; vml = vml->next)
		if (start >= vml->vma->vm_start && start + len <= vml->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;
}

/*
 * 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
			if (addr >= L1_CODE_START
			    && addr + sizeof(tmp) <= L1_CODE_START + L1_CODE_LENGTH) {
				safe_dma_memcpy (&tmp, (const void *)(addr), sizeof(tmp));
				copied = sizeof(tmp);
			} else
#endif
#if L1_DATA_A_LENGTH != 0
			if (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
#endif
#if L1_DATA_B_LENGTH != 0
			if (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
#endif
			if (addr >= FIXED_CODE_START
			    && addr + sizeof(tmp) <= FIXED_CODE_END) {
				memcpy(&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
			if (addr >= L1_CODE_START
			    && addr + sizeof(data) <= L1_CODE_START + L1_CODE_LENGTH) {
				safe_dma_memcpy ((void *)(addr), &data, sizeof(data));
				copied = sizeof(data);
			} else
#endif
#if L1_DATA_A_LENGTH != 0
			if (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
#endif
#if L1_DATA_B_LENGTH != 0
			if (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
#endif
			if (addr >= FIXED_CODE_START
			    && addr + sizeof(data) <= FIXED_CODE_END) {
				memcpy((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. */
			long tmp;

			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;
			/* make sure the single step bit is not set. */
			tmp = get_reg(child, PT_SYSCFG) & ~(TRACE_BITS);
			put_reg(child, PT_SYSCFG, tmp);
			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:
		{
			long tmp;
			ret = 0;
			if (child->exit_state == EXIT_ZOMBIE)	/* already dead */
				break;
			child->exit_code = SIGKILL;
			/* make sure the single step bit is not set. */
			tmp = get_reg(child, PT_SYSCFG) & ~(TRACE_BITS);
			put_reg(child, PT_SYSCFG, tmp);
			wake_up_process(child);
			break;
		}

	case PTRACE_SINGLESTEP:
		{		/* set the trap flag. */
			long tmp;

			pr_debug("ptrace: single step\n");
			ret = -EIO;
			if (!valid_signal(data))
				break;
			clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);

			tmp = get_reg(child, PT_SYSCFG) | (TRACE_BITS);
			put_reg(child, PT_SYSCFG, tmp);

			child->exit_code = data;
			/* give it a chance to run. */
			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>
1394f032	48
1394f032 BW	49	#define TEXT_OFFSET 0
	50	/*
	51	* does not yet catch signals sent when the child dies.
	52	* in exit.c or in signal.c.
	53	*/
	54
	55	/* determines which bits in the SYSCFG reg the user has access to. */
	56	/* 1 = access 0 = no access */
	57	#define SYSCFG_MASK 0x0007 /* SYSCFG reg */
	58	/* sets the trace bits. */
	59	#define TRACE_BITS 0x0001
	60
	61	/* Find the stack offset for a register, relative to thread.esp0. */
	62	#define PT_REG(reg) ((long)&((struct pt_regs *)0)->reg)
	63
	64	/*
	65	* Get the address of the live pt_regs for the specified task.
	66	* These are saved onto the top kernel stack when the process
	67	* is not running.
	68	*
	69	* Note: if a user thread is execve'd from kernel space, the
	70	* kernel stack will not be empty on entry to the kernel, so
	71	* ptracing these tasks will fail.
	72	*/
	73	static inline struct pt_regs get_user_regs(struct task_struct task)
	74	{
	75	return (struct pt_regs *)
f7e4217b	76	((unsigned long)task_stack_page(task) +
1394f032 BW	77	(THREAD_SIZE - sizeof(struct pt_regs)));
	78	}
	79
	80	/*
	81	* Get all user integer registers.
	82	*/
	83	static inline int ptrace_getregs(struct task_struct tsk, void __user uregs)
	84	{
	85	struct pt_regs *regs = get_user_regs(tsk);
	86	return copy_to_user(uregs, regs, sizeof(struct pt_regs)) ? -EFAULT : 0;
	87	}
	88
	89	/* Mapping from PT_xxx to the stack offset at which the register is
	90	* saved. Notice that usp has no stack-slot and needs to be treated
	91	* specially (see get_reg/put_reg below).
	92	*/
	93
	94	/*
	95	* Get contents of register REGNO in task TASK.
	96	*/
	97	static inline long get_reg(struct task_struct *task, int regno)
	98	{
	99	unsigned char *reg_ptr;
	100
	101	struct pt_regs *regs =
f7e4217b	102	(struct pt_regs *)((unsigned long)task_stack_page(task) +
1394f032 BW	103	(THREAD_SIZE - sizeof(struct pt_regs)));
	104	reg_ptr = (char *)regs;
	105
	106	switch (regno) {
	107	case PT_USP:
	108	return task->thread.usp;
	109	default:
	110	if (regno <= 216)
	111	return (long )(reg_ptr + regno);
	112	}
	113	/* slight mystery ... never seems to come here but kernel misbehaves without this code! */
	114
	115	printk(KERN_WARNING "Request to get for unknown register %d\n", regno);
	116	return 0;
	117	}
	118
	119	/*
	120	* Write contents of register REGNO in task TASK.
	121	*/
	122	static inline int
	123	put_reg(struct task_struct *task, int regno, unsigned long data)
	124	{
1f83b8f1	125	char *reg_ptr;
1394f032 BW	126
1394f032 BW	127	struct pt_regs *regs =
f7e4217b	128	(struct pt_regs *)((unsigned long)task_stack_page(task) +
1394f032 BW	129	(THREAD_SIZE - sizeof(struct pt_regs)));
	130	reg_ptr = (char *)regs;
	131
	132	switch (regno) {
	133	case PT_PC:
	134	/*********************************************************************/
	135	/* At this point the kernel is most likely in exception. */
	136	/* The RETX register will be used to populate the pc of the process. */
	137	/*********************************************************************/
	138	regs->retx = data;
	139	regs->pc = data;
	140	break;
	141	case PT_RETX:
	142	break; /* regs->retx = data; break; */
	143	case PT_USP:
	144	regs->usp = data;
	145	task->thread.usp = data;
	146	break;
	147	default:
	148	if (regno <= 216)
1f83b8f1	149	(long )(reg_ptr + regno) = data;
1394f032 BW	150	}
	151	return 0;
	152	}
	153
	154	/*
	155	* check that an address falls within the bounds of the target process's memory mappings
	156	*/
	157	static inline int is_user_addr_valid(struct task_struct *child,
	158	unsigned long start, unsigned long len)
	159	{
	160	struct vm_list_struct *vml;
	161	struct sram_list_struct *sraml;
	162
	163	for (vml = child->mm->context.vmlist; vml; vml = vml->next)
	164	if (start >= vml->vma->vm_start && start + len <= vml->vma->vm_end)
	165	return 0;
	166
	167	for (sraml = child->mm->context.sram_list; sraml; sraml = sraml->next)
	168	if (start >= (unsigned long)sraml->addr
	169	&& start + len <= (unsigned long)sraml->addr + sraml->length)
	170	return 0;
	171
26156397 JZ	172	if (start >= FIXED_CODE_START && start + len <= FIXED_CODE_END)
	173	return 0;
	174
1394f032 BW	175	return -EIO;
	176	}
	177
	178	/*
	179	* Called by kernel/ptrace.c when detaching..
	180	*
	181	* Make sure the single step bit is not set.
	182	*/
	183	void ptrace_disable(struct task_struct *child)
	184	{
	185	unsigned long tmp;
	186	/* make sure the single step bit is not set. */
7d39270d BS	187	tmp = get_reg(child, PT_SYSCFG) & ~TRACE_BITS;
7d39270d BS	188	put_reg(child, PT_SYSCFG, tmp);
1394f032 BW	189	}
	190
	191	long arch_ptrace(struct task_struct *child, long request, long addr, long data)
	192	{
	193	int ret;
0ddeeca2	194	unsigned long __user datap = (unsigned long __user )data;
1394f032 BW	195
	196	switch (request) {
	197	/* when I and D space are separate, these will need to be fixed. */
	198	case PTRACE_PEEKDATA:
	199	pr_debug("ptrace: PEEKDATA\n");
1394f032 BW	200	/* fall through */
	201	case PTRACE_PEEKTEXT: /* read word at location addr. */
	202	{
	203	unsigned long tmp = 0;
	204	int copied;
	205
	206	ret = -EIO;
dabaad5b MF	207	pr_debug("ptrace: PEEKTEXT at addr 0x%08lx + %ld\n", addr, sizeof(data));
dabaad5b MF	208	if (is_user_addr_valid(child, addr, sizeof(tmp)) < 0)
1394f032 BW	209	break;
	210	pr_debug("ptrace: user address is valid\n");
	211
	212	#if L1_CODE_LENGTH != 0
dabaad5b MF	213	if (addr >= L1_CODE_START
	214	&& addr + sizeof(tmp) <= L1_CODE_START + L1_CODE_LENGTH) {
	215	safe_dma_memcpy (&tmp, (const void *)(addr), sizeof(tmp));
1394f032 BW	216	copied = sizeof(tmp);
1394f032 BW	217	} else
6546eae4 JZ	218	#endif
6546eae4 JZ	219	#if L1_DATA_A_LENGTH != 0
dabaad5b MF	220	if (addr >= L1_DATA_A_START
	221	&& addr + sizeof(tmp) <= L1_DATA_A_START + L1_DATA_A_LENGTH) {
	222	memcpy(&tmp, (const void *)(addr), sizeof(tmp));
6546eae4 JZ	223	copied = sizeof(tmp);
	224	} else
	225	#endif
	226	#if L1_DATA_B_LENGTH != 0
dabaad5b MF	227	if (addr >= L1_DATA_B_START
	228	&& addr + sizeof(tmp) <= L1_DATA_B_START + L1_DATA_B_LENGTH) {
	229	memcpy(&tmp, (const void *)(addr), sizeof(tmp));
6546eae4 JZ	230	copied = sizeof(tmp);
6546eae4 JZ	231	} else
1394f032	232	#endif
dabaad5b MF	233	if (addr >= FIXED_CODE_START
	234	&& addr + sizeof(tmp) <= FIXED_CODE_END) {
	235	memcpy(&tmp, (const void *)(addr), sizeof(tmp));
26156397 JZ	236	copied = sizeof(tmp);
26156397 JZ	237	} else
dabaad5b	238	copied = access_process_vm(child, addr, &tmp,
26156397	239	sizeof(tmp), 0);
1394f032 BW	240	pr_debug("ptrace: copied size %d [0x%08lx]\n", copied, tmp);
	241	if (copied != sizeof(tmp))
	242	break;
0ddeeca2	243	ret = put_user(tmp, datap);
1394f032 BW	244	break;
	245	}
	246
	247	/* read the word at location addr in the USER area. */
	248	case PTRACE_PEEKUSR:
	249	{
	250	unsigned long tmp;
	251	ret = -EIO;
	252	tmp = 0;
	253	if ((addr & 3) \|\| (addr > (sizeof(struct pt_regs) + 16))) {
	254	printk(KERN_WARNING "ptrace error : PEEKUSR : temporarily returning "
	255	"0 - %x sizeof(pt_regs) is %lx\n",
	256	(int)addr, sizeof(struct pt_regs));
	257	break;
	258	}
	259	if (addr == sizeof(struct pt_regs)) {
	260	/* PT_TEXT_ADDR */
	261	tmp = child->mm->start_code + TEXT_OFFSET;
	262	} else if (addr == (sizeof(struct pt_regs) + 4)) {
	263	/* PT_TEXT_END_ADDR */
	264	tmp = child->mm->end_code;
	265	} else if (addr == (sizeof(struct pt_regs) + 8)) {
	266	/* PT_DATA_ADDR */
	267	tmp = child->mm->start_data;
	268	#ifdef CONFIG_BINFMT_ELF_FDPIC
	269	} else if (addr == (sizeof(struct pt_regs) + 12)) {
	270	tmp = child->mm->context.exec_fdpic_loadmap;
	271	} else if (addr == (sizeof(struct pt_regs) + 16)) {
	272	tmp = child->mm->context.interp_fdpic_loadmap;
	273	#endif
	274	} else {
	275	tmp = get_reg(child, addr);
	276	}
0ddeeca2	277	ret = put_user(tmp, datap);
1394f032 BW	278	break;
	279	}
	280
	281	/* when I and D space are separate, this will have to be fixed. */
	282	case PTRACE_POKEDATA:
d3ab3a62	283	pr_debug("ptrace: PTRACE_PEEKDATA\n");
1394f032 BW	284	/* fall through */
	285	case PTRACE_POKETEXT: /* write the word at location addr. */
	286	{
	287	int copied;
	288
	289	ret = -EIO;
dabaad5b MF	290	pr_debug("ptrace: POKETEXT at addr 0x%08lx + %ld bytes %lx\n",
	291	addr, sizeof(data), data);
	292	if (is_user_addr_valid(child, addr, sizeof(data)) < 0)
1394f032 BW	293	break;
	294	pr_debug("ptrace: user address is valid\n");
	295
	296	#if L1_CODE_LENGTH != 0
dabaad5b MF	297	if (addr >= L1_CODE_START
	298	&& addr + sizeof(data) <= L1_CODE_START + L1_CODE_LENGTH) {
	299	safe_dma_memcpy ((void *)(addr), &data, sizeof(data));
1394f032 BW	300	copied = sizeof(data);
1394f032 BW	301	} else
6546eae4 JZ	302	#endif
6546eae4 JZ	303	#if L1_DATA_A_LENGTH != 0
dabaad5b MF	304	if (addr >= L1_DATA_A_START
	305	&& addr + sizeof(data) <= L1_DATA_A_START + L1_DATA_A_LENGTH) {
	306	memcpy((void *)(addr), &data, sizeof(data));
6546eae4 JZ	307	copied = sizeof(data);
	308	} else
	309	#endif
	310	#if L1_DATA_B_LENGTH != 0
dabaad5b MF	311	if (addr >= L1_DATA_B_START
	312	&& addr + sizeof(data) <= L1_DATA_B_START + L1_DATA_B_LENGTH) {
	313	memcpy((void *)(addr), &data, sizeof(data));
6546eae4 JZ	314	copied = sizeof(data);
6546eae4 JZ	315	} else
1394f032	316	#endif
dabaad5b MF	317	if (addr >= FIXED_CODE_START
	318	&& addr + sizeof(data) <= FIXED_CODE_END) {
	319	memcpy((void *)(addr), &data, sizeof(data));
26156397 JZ	320	copied = sizeof(data);
26156397 JZ	321	} else
dabaad5b	322	copied = access_process_vm(child, addr, &data,
26156397	323	sizeof(data), 1);
1394f032 BW	324	pr_debug("ptrace: copied size %d\n", copied);
	325	if (copied != sizeof(data))
	326	break;
	327	ret = 0;
	328	break;
	329	}
	330
	331	case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
	332	ret = -EIO;
	333	if ((addr & 3) \|\| (addr > (sizeof(struct pt_regs) + 16))) {
	334	printk(KERN_WARNING "ptrace error : POKEUSR: temporarily returning 0\n");
	335	break;
	336	}
	337
	338	if (addr >= (sizeof(struct pt_regs))) {
	339	ret = 0;
	340	break;
	341	}
	342	if (addr == PT_SYSCFG) {
	343	data &= SYSCFG_MASK;
	344	data \|= get_reg(child, PT_SYSCFG);
	345	}
	346	ret = put_reg(child, addr, data);
	347	break;
	348
	349	case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
	350	case PTRACE_CONT:
	351	{ /* restart after signal. */
	352	long tmp;
	353
d3ab3a62	354	pr_debug("ptrace: syscall/cont\n");
1394f032 BW	355
	356	ret = -EIO;
	357	if (!valid_signal(data))
	358	break;
	359	if (request == PTRACE_SYSCALL)
	360	set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
	361	else
	362	clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
	363
	364	child->exit_code = data;
	365	/* make sure the single step bit is not set. */
	366	tmp = get_reg(child, PT_SYSCFG) & ~(TRACE_BITS);
	367	put_reg(child, PT_SYSCFG, tmp);
d3ab3a62	368	pr_debug("ptrace: before wake_up_process\n");
1394f032 BW	369	wake_up_process(child);
	370	ret = 0;
	371	break;
	372	}
	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:
	380	{
	381	long tmp;
	382	ret = 0;
	383	if (child->exit_state == EXIT_ZOMBIE) /* already dead */
	384	break;
	385	child->exit_code = SIGKILL;
	386	/* make sure the single step bit is not set. */
	387	tmp = get_reg(child, PT_SYSCFG) & ~(TRACE_BITS);
	388	put_reg(child, PT_SYSCFG, tmp);
	389	wake_up_process(child);
	390	break;
	391	}
	392
	393	case PTRACE_SINGLESTEP:
	394	{ /* set the trap flag. */
	395	long tmp;
	396
d3ab3a62	397	pr_debug("ptrace: single step\n");
1394f032 BW	398	ret = -EIO;
	399	if (!valid_signal(data))
	400	break;
	401	clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
	402
	403	tmp = get_reg(child, PT_SYSCFG) \| (TRACE_BITS);
	404	put_reg(child, PT_SYSCFG, tmp);
	405
	406	child->exit_code = data;
	407	/* give it a chance to run. */
	408	wake_up_process(child);
	409	ret = 0;
	410	break;
	411	}
	412
1394f032	413	case PTRACE_GETREGS:
d3ab3a62 MF	414	/* Get all gp regs from the child. */
	415	ret = ptrace_getregs(child, datap);
	416	break;
1394f032 BW	417
1394f032 BW	418	case PTRACE_SETREGS:
d3ab3a62 MF	419	printk(KERN_WARNING "ptrace: SETREGS: ** NOT IMPLEMENTED *\n");
	420	/* Set all gp regs in the child. */
	421	ret = 0;
	422	break;
	423
1394f032 BW	424	default:
	425	ret = ptrace_request(child, request, addr, data);
	426	break;
	427	}
	428
	429	return ret;
	430	}
	431
	432	asmlinkage void syscall_trace(void)
	433	{
1394f032 BW	434	if (!test_thread_flag(TIF_SYSCALL_TRACE))
	435	return;
	436
	437	if (!(current->ptrace & PT_PTRACED))
	438	return;
	439
	440	/* the 0x80 provides a way for the tracing parent to distinguish
	441	* between a syscall stop and SIGTRAP delivery
	442	*/
	443	ptrace_notify(SIGTRAP \| ((current->ptrace & PT_TRACESYSGOOD)
	444	? 0x80 : 0));
	445
	446	/*
	447	* this isn't the same as continuing with a signal, but it will do
	448	* for normal use. strace only continues with a signal if the
	449	* stopping signal is not SIGTRAP. -brl
	450	*/
	451	if (current->exit_code) {
	452	send_sig(current->exit_code, current, 1);
	453	current->exit_code = 0;
	454	}
	455	}