[deliverable/linux.git] / arch / powerpc / kernel / ptrace32.c

/*
 * ptrace for 32-bit processes running on a 64-bit kernel.
 *
 *  PowerPC version
 *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
 *
 *  Derived from "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
 *
 * Modified by Cort Dougan (cort@hq.fsmlabs.com)
 * and Paul Mackerras (paulus@samba.org).
 *
 * 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/config.h>
#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/security.h>
#include <linux/signal.h>

#include <asm/uaccess.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/system.h>

#include "ptrace-common.h"

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

long compat_sys_ptrace(int request, int pid, unsigned long addr,
		       unsigned long data)
{
	struct task_struct *child;
	int ret;

	lock_kernel();
	if (request == PTRACE_TRACEME) {
		ret = ptrace_traceme();
		goto out;
	}

	child = ptrace_get_task_struct(pid);
	if (IS_ERR(child)) {
		ret = PTR_ERR(child);
		goto out;
	}

	if (request == PTRACE_ATTACH) {
		ret = ptrace_attach(child);
		goto out_tsk;
	}

	ret = ptrace_check_attach(child, request == PTRACE_KILL);
	if (ret < 0)
		goto out_tsk;

	switch (request) {
	/* when I and D space are separate, these will need to be fixed. */
	case PTRACE_PEEKTEXT: /* read word at location addr. */ 
	case PTRACE_PEEKDATA: {
		unsigned int tmp;
		int copied;

		copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0);
		ret = -EIO;
		if (copied != sizeof(tmp))
			break;
		ret = put_user(tmp, (u32 __user *)data);
		break;
	}

	/*
	 * Read 4 bytes of the other process' storage
	 *  data is a pointer specifying where the user wants the
	 *	4 bytes copied into
	 *  addr is a pointer in the user's storage that contains an 8 byte
	 *	address in the other process of the 4 bytes that is to be read
	 * (this is run in a 32-bit process looking at a 64-bit process)
	 * when I and D space are separate, these will need to be fixed.
	 */
	case PPC_PTRACE_PEEKTEXT_3264:
	case PPC_PTRACE_PEEKDATA_3264: {
		u32 tmp;
		int copied;
		u32 __user * addrOthers;

		ret = -EIO;

		/* Get the addr in the other process that we want to read */
		if (get_user(addrOthers, (u32 __user * __user *)addr) != 0)
			break;

		copied = access_process_vm(child, (u64)addrOthers, &tmp,
				sizeof(tmp), 0);
		if (copied != sizeof(tmp))
			break;
		ret = put_user(tmp, (u32 __user *)data);
		break;
	}

	/* Read a register (specified by ADDR) out of the "user area" */
	case PTRACE_PEEKUSR: {
		int index;
		unsigned long tmp;

		ret = -EIO;
		/* convert to index and check */
		index = (unsigned long) addr >> 2;
		if ((addr & 3) || (index > PT_FPSCR32))
			break;

		if (index < PT_FPR0) {
			tmp = get_reg(child, index);
		} else {
			flush_fp_to_thread(child);
			/*
			 * the user space code considers the floating point
			 * to be an array of unsigned int (32 bits) - the
			 * index passed in is based on this assumption.
			 */
			tmp = ((unsigned int *)child->thread.fpr)[index - PT_FPR0];
		}
		ret = put_user((unsigned int)tmp, (u32 __user *)data);
		break;
	}
  
	/*
	 * Read 4 bytes out of the other process' pt_regs area
	 *  data is a pointer specifying where the user wants the
	 *	4 bytes copied into
	 *  addr is the offset into the other process' pt_regs structure
	 *	that is to be read
	 * (this is run in a 32-bit process looking at a 64-bit process)
	 */
	case PPC_PTRACE_PEEKUSR_3264: {
		u32 index;
		u32 reg32bits;
		u64 tmp;
		u32 numReg;
		u32 part;

		ret = -EIO;
		/* Determine which register the user wants */
		index = (u64)addr >> 2;
		numReg = index / 2;
		/* Determine which part of the register the user wants */
		if (index % 2)
			part = 1;  /* want the 2nd half of the register (right-most). */
		else
			part = 0;  /* want the 1st half of the register (left-most). */

		/* Validate the input - check to see if address is on the wrong boundary or beyond the end of the user area */
		if ((addr & 3) || numReg > PT_FPSCR)
			break;

		if (numReg >= PT_FPR0) {
			flush_fp_to_thread(child);
			tmp = ((unsigned long int *)child->thread.fpr)[numReg - PT_FPR0];
		} else { /* register within PT_REGS struct */
			tmp = get_reg(child, numReg);
		} 
		reg32bits = ((u32*)&tmp)[part];
		ret = put_user(reg32bits, (u32 __user *)data);
		break;
	}

	/* If I and D space are separate, this will have to be fixed. */
	case PTRACE_POKETEXT: /* write the word at location addr. */
	case PTRACE_POKEDATA: {
		unsigned int tmp;
		tmp = data;
		ret = 0;
		if (access_process_vm(child, addr, &tmp, sizeof(tmp), 1)
				== sizeof(tmp))
			break;
		ret = -EIO;
		break;
	}

	/*
	 * Write 4 bytes into the other process' storage
	 *  data is the 4 bytes that the user wants written
	 *  addr is a pointer in the user's storage that contains an
	 *	8 byte address in the other process where the 4 bytes
	 *	that is to be written
	 * (this is run in a 32-bit process looking at a 64-bit process)
	 * when I and D space are separate, these will need to be fixed.
	 */
	case PPC_PTRACE_POKETEXT_3264:
	case PPC_PTRACE_POKEDATA_3264: {
		u32 tmp = data;
		u32 __user * addrOthers;

		/* Get the addr in the other process that we want to write into */
		ret = -EIO;
		if (get_user(addrOthers, (u32 __user * __user *)addr) != 0)
			break;
		ret = 0;
		if (access_process_vm(child, (u64)addrOthers, &tmp,
					sizeof(tmp), 1) == sizeof(tmp))
			break;
		ret = -EIO;
		break;
	}

	/* write the word at location addr in the USER area */
	case PTRACE_POKEUSR: {
		unsigned long index;

		ret = -EIO;
		/* convert to index and check */
		index = (unsigned long) addr >> 2;
		if ((addr & 3) || (index > PT_FPSCR32))
			break;

		if (index == PT_ORIG_R3)
			break;
		if (index < PT_FPR0) {
			ret = put_reg(child, index, data);
		} else {
			flush_fp_to_thread(child);
			/*
			 * the user space code considers the floating point
			 * to be an array of unsigned int (32 bits) - the
			 * index passed in is based on this assumption.
			 */
			((unsigned int *)child->thread.fpr)[index - PT_FPR0] = data;
			ret = 0;
		}
		break;
	}

	/*
	 * Write 4 bytes into the other process' pt_regs area
	 *  data is the 4 bytes that the user wants written
	 *  addr is the offset into the other process' pt_regs structure
	 *	that is to be written into
	 * (this is run in a 32-bit process looking at a 64-bit process)
	 */
	case PPC_PTRACE_POKEUSR_3264: {
		u32 index;
		u32 numReg;

		ret = -EIO;
		/* Determine which register the user wants */
		index = (u64)addr >> 2;
		numReg = index / 2;
		/*
		 * Validate the input - check to see if address is on the
		 * wrong boundary or beyond the end of the user area
		 */
		if ((addr & 3) || (numReg > PT_FPSCR))
			break;
		/* Insure it is a register we let them change */
		if ((numReg == PT_ORIG_R3)
				|| ((numReg > PT_CCR) && (numReg < PT_FPR0)))
			break;
		if (numReg >= PT_FPR0) {
			flush_fp_to_thread(child);
		}
		if (numReg == PT_MSR)
			data = (data & MSR_DEBUGCHANGE)
				| (child->thread.regs->msr & ~MSR_DEBUGCHANGE);
		((u32*)child->thread.regs)[index] = data;
		ret = 0;
		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;
		/* make sure the single step bit is not set. */
		clear_single_step(child);
		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;
		/* make sure the single step bit is not set. */
		clear_single_step(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);
		set_single_step(child);
		child->exit_code = data;
		/* give it a chance to run. */
		wake_up_process(child);
		ret = 0;
		break;
	}

	case PTRACE_GET_DEBUGREG: {
		ret = -EINVAL;
		/* We only support one DABR and no IABRS at the moment */
		if (addr > 0)
			break;
		ret = put_user(child->thread.dabr, (u32 __user *)data);
		break;
	}

	case PTRACE_SET_DEBUGREG:
		ret = ptrace_set_debugreg(child, addr, data);
		break;

	case PTRACE_DETACH:
		ret = ptrace_detach(child, data);
		break;

	case PPC_PTRACE_GETREGS: { /* Get GPRs 0 - 31. */
		int i;
		unsigned long *reg = &((unsigned long *)child->thread.regs)[0];
		unsigned int __user *tmp = (unsigned int __user *)addr;

		for (i = 0; i < 32; i++) {
			ret = put_user(*reg, tmp);
			if (ret)
				break;
			reg++;
			tmp++;
		}
		break;
	}

	case PPC_PTRACE_SETREGS: { /* Set GPRs 0 - 31. */
		int i;
		unsigned long *reg = &((unsigned long *)child->thread.regs)[0];
		unsigned int __user *tmp = (unsigned int __user *)addr;

		for (i = 0; i < 32; i++) {
			ret = get_user(*reg, tmp);
			if (ret)
				break;
			reg++;
			tmp++;
		}
		break;
	}

	case PPC_PTRACE_GETFPREGS: { /* Get FPRs 0 - 31. */
		int i;
		unsigned long *reg = &((unsigned long *)child->thread.fpr)[0];
		unsigned int __user *tmp = (unsigned int __user *)addr;

		flush_fp_to_thread(child);

		for (i = 0; i < 32; i++) {
			ret = put_user(*reg, tmp);
			if (ret)
				break;
			reg++;
			tmp++;
		}
		break;
	}

	case PPC_PTRACE_SETFPREGS: { /* Get FPRs 0 - 31. */
		int i;
		unsigned long *reg = &((unsigned long *)child->thread.fpr)[0];
		unsigned int __user *tmp = (unsigned int __user *)addr;

		flush_fp_to_thread(child);

		for (i = 0; i < 32; i++) {
			ret = get_user(*reg, tmp);
			if (ret)
				break;
			reg++;
			tmp++;
		}
		break;
	}

	case PTRACE_GETEVENTMSG:
		ret = put_user(child->ptrace_message, (unsigned int __user *) data);
		break;

#ifdef CONFIG_ALTIVEC
	case PTRACE_GETVRREGS:
		/* Get the child altivec register state. */
		flush_altivec_to_thread(child);
		ret = get_vrregs((unsigned long __user *)data, child);
		break;

	case PTRACE_SETVRREGS:
		/* Set the child altivec register state. */
		flush_altivec_to_thread(child);
		ret = set_vrregs(child, (unsigned long __user *)data);
		break;
#endif

	default:
		ret = ptrace_request(child, request, addr, data);
		break;
	}
out_tsk:
	put_task_struct(child);
out:
	unlock_kernel();
	return ret;
}
Commit	Line	Data
1da177e4	1	/*
b123923d	2	* ptrace for 32-bit processes running on a 64-bit kernel.
1da177e4 LT	3	*
	4	* PowerPC version
	5	* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
	6	*
	7	* Derived from "arch/m68k/kernel/ptrace.c"
	8	* Copyright (C) 1994 by Hamish Macdonald
	9	* Taken from linux/kernel/ptrace.c and modified for M680x0.
	10	* linux/kernel/ptrace.c is by Ross Biro 1/23/92, edited by Linus Torvalds
	11	*
	12	* Modified by Cort Dougan (cort@hq.fsmlabs.com)
b123923d	13	* and Paul Mackerras (paulus@samba.org).
1da177e4 LT	14	*
1da177e4 LT	15	* This file is subject to the terms and conditions of the GNU General
b123923d	16	* Public License. See the file COPYING in the main directory of
1da177e4 LT	17	* this archive for more details.
	18	*/
	19
962bca7f	20	#include <linux/config.h>
1da177e4 LT	21	#include <linux/kernel.h>
	22	#include <linux/sched.h>
	23	#include <linux/mm.h>
	24	#include <linux/smp.h>
	25	#include <linux/smp_lock.h>
	26	#include <linux/errno.h>
	27	#include <linux/ptrace.h>
	28	#include <linux/user.h>
	29	#include <linux/security.h>
7ed20e1a	30	#include <linux/signal.h>
1da177e4 LT	31
	32	#include <asm/uaccess.h>
	33	#include <asm/page.h>
	34	#include <asm/pgtable.h>
	35	#include <asm/system.h>
21a62902 PM	36
21a62902 PM	37	#include "ptrace-common.h"
1da177e4 LT	38
	39	/*
	40	* does not yet catch signals sent when the child dies.
	41	* in exit.c or in signal.c.
	42	*/
	43
734d6524 PM	44	long compat_sys_ptrace(int request, int pid, unsigned long addr,
734d6524 PM	45	unsigned long data)
1da177e4 LT	46	{
1da177e4 LT	47	struct task_struct *child;
6b9c7ed8	48	int ret;
1da177e4 LT	49
	50	lock_kernel();
	51	if (request == PTRACE_TRACEME) {
6b9c7ed8	52	ret = ptrace_traceme();
1da177e4 LT	53	goto out;
1da177e4 LT	54	}
1da177e4	55
6b9c7ed8 CH	56	child = ptrace_get_task_struct(pid);
	57	if (IS_ERR(child)) {
	58	ret = PTR_ERR(child);
	59	goto out;
	60	}
1da177e4 LT	61
	62	if (request == PTRACE_ATTACH) {
	63	ret = ptrace_attach(child);
	64	goto out_tsk;
	65	}
	66
	67	ret = ptrace_check_attach(child, request == PTRACE_KILL);
	68	if (ret < 0)
	69	goto out_tsk;
	70
	71	switch (request) {
	72	/* when I and D space are separate, these will need to be fixed. */
	73	case PTRACE_PEEKTEXT: /* read word at location addr. */
	74	case PTRACE_PEEKDATA: {
	75	unsigned int tmp;
	76	int copied;
	77
	78	copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0);
	79	ret = -EIO;
	80	if (copied != sizeof(tmp))
	81	break;
	82	ret = put_user(tmp, (u32 __user *)data);
	83	break;
	84	}
	85
	86	/*
	87	* Read 4 bytes of the other process' storage
	88	* data is a pointer specifying where the user wants the
	89	* 4 bytes copied into
	90	* addr is a pointer in the user's storage that contains an 8 byte
	91	* address in the other process of the 4 bytes that is to be read
	92	* (this is run in a 32-bit process looking at a 64-bit process)
	93	* when I and D space are separate, these will need to be fixed.
	94	*/
	95	case PPC_PTRACE_PEEKTEXT_3264:
	96	case PPC_PTRACE_PEEKDATA_3264: {
	97	u32 tmp;
	98	int copied;
	99	u32 __user * addrOthers;
	100
	101	ret = -EIO;
	102
	103	/* Get the addr in the other process that we want to read */
	104	if (get_user(addrOthers, (u32 __user * __user *)addr) != 0)
	105	break;
	106
	107	copied = access_process_vm(child, (u64)addrOthers, &tmp,
	108	sizeof(tmp), 0);
	109	if (copied != sizeof(tmp))
	110	break;
	111	ret = put_user(tmp, (u32 __user *)data);
	112	break;
	113	}
	114
	115	/* Read a register (specified by ADDR) out of the "user area" */
	116	case PTRACE_PEEKUSR: {
	117	int index;
	118	unsigned long tmp;
	119
	120	ret = -EIO;
	121	/* convert to index and check */
	122	index = (unsigned long) addr >> 2;
	123	if ((addr & 3) \|\| (index > PT_FPSCR32))
	124	break;
125
126	if (index < PT_FPR0) {
127	tmp = get_reg(child, index);
128	} else {
129	flush_fp_to_thread(child);
130	/*
131	* the user space code considers the floating point
132	* to be an array of unsigned int (32 bits) - the
133	* index passed in is based on this assumption.
134	*/
135	tmp = ((unsigned int *)child->thread.fpr)[index - PT_FPR0];
136	}
137	ret = put_user((unsigned int)tmp, (u32 __user *)data);
138	break;
139	}
140
141	/*
142	* Read 4 bytes out of the other process' pt_regs area
143	* data is a pointer specifying where the user wants the
144	* 4 bytes copied into
145	* addr is the offset into the other process' pt_regs structure
146	* that is to be read
147	* (this is run in a 32-bit process looking at a 64-bit process)
148	*/
149	case PPC_PTRACE_PEEKUSR_3264: {
150	u32 index;
151	u32 reg32bits;
152	u64 tmp;
153	u32 numReg;
154	u32 part;
155
156	ret = -EIO;
157	/* Determine which register the user wants */
158	index = (u64)addr >> 2;
159	numReg = index / 2;
160	/* Determine which part of the register the user wants */
161	if (index % 2)
162	part = 1; /* want the 2nd half of the register (right-most). */
163	else
164	part = 0; /* want the 1st half of the register (left-most). */
165
166	/* Validate the input - check to see if address is on the wrong boundary or beyond the end of the user area */
167	if ((addr & 3) \|\| numReg > PT_FPSCR)
168	break;
169
170	if (numReg >= PT_FPR0) {
171	flush_fp_to_thread(child);
172	tmp = ((unsigned long int *)child->thread.fpr)[numReg - PT_FPR0];
173	} else { /* register within PT_REGS struct */
174	tmp = get_reg(child, numReg);
175	}
176	reg32bits = ((u32*)&tmp)[part];
177	ret = put_user(reg32bits, (u32 __user *)data);
178	break;
179	}
180
181	/* If I and D space are separate, this will have to be fixed. */
182	case PTRACE_POKETEXT: /* write the word at location addr. */
183	case PTRACE_POKEDATA: {
184	unsigned int tmp;
185	tmp = data;
186	ret = 0;
187	if (access_process_vm(child, addr, &tmp, sizeof(tmp), 1)
188	== sizeof(tmp))
189	break;
190	ret = -EIO;
191	break;
192	}
193
194	/*
195	* Write 4 bytes into the other process' storage
196	* data is the 4 bytes that the user wants written
197	* addr is a pointer in the user's storage that contains an
198	* 8 byte address in the other process where the 4 bytes
199	* that is to be written
200	* (this is run in a 32-bit process looking at a 64-bit process)
201	* when I and D space are separate, these will need to be fixed.
202	*/
203	case PPC_PTRACE_POKETEXT_3264:
204	case PPC_PTRACE_POKEDATA_3264: {
205	u32 tmp = data;
206	u32 __user * addrOthers;
207
208	/* Get the addr in the other process that we want to write into */
209	ret = -EIO;
210	if (get_user(addrOthers, (u32 __user * __user *)addr) != 0)
211	break;
212	ret = 0;
213	if (access_process_vm(child, (u64)addrOthers, &tmp,
214	sizeof(tmp), 1) == sizeof(tmp))
215	break;
216	ret = -EIO;
217	break;
218	}
219
220	/* write the word at location addr in the USER area */
221	case PTRACE_POKEUSR: {
222	unsigned long index;
223
224	ret = -EIO;
225	/* convert to index and check */
226	index = (unsigned long) addr >> 2;
227	if ((addr & 3) \|\| (index > PT_FPSCR32))
228	break;
229
230	if (index == PT_ORIG_R3)
231	break;
232	if (index < PT_FPR0) {
233	ret = put_reg(child, index, data);
234	} else {
235	flush_fp_to_thread(child);
236	/*
237	* the user space code considers the floating point
238	* to be an array of unsigned int (32 bits) - the
239	* index passed in is based on this assumption.
240	*/
241	((unsigned int *)child->thread.fpr)[index - PT_FPR0] = data;
242	ret = 0;
243	}
244	break;
245	}
246
247	/*
248	* Write 4 bytes into the other process' pt_regs area
249	* data is the 4 bytes that the user wants written
250	* addr is the offset into the other process' pt_regs structure
251	* that is to be written into
252	* (this is run in a 32-bit process looking at a 64-bit process)
253	*/
254	case PPC_PTRACE_POKEUSR_3264: {
255	u32 index;
256	u32 numReg;
257
258	ret = -EIO;
259	/* Determine which register the user wants */
260	index = (u64)addr >> 2;
261	numReg = index / 2;
262	/*
263	* Validate the input - check to see if address is on the
264	* wrong boundary or beyond the end of the user area
265	*/
266	if ((addr & 3) \|\| (numReg > PT_FPSCR))
267	break;
268	/* Insure it is a register we let them change */
269	if ((numReg == PT_ORIG_R3)
270	\|\| ((numReg > PT_CCR) && (numReg < PT_FPR0)))
271	break;
272	if (numReg >= PT_FPR0) {
273	flush_fp_to_thread(child);
274	}
275	if (numReg == PT_MSR)
276	data = (data & MSR_DEBUGCHANGE)
277	\| (child->thread.regs->msr & ~MSR_DEBUGCHANGE);
278	((u32*)child->thread.regs)[index] = data;
279	ret = 0;
280	break;
281	}
282
283	case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
284	case PTRACE_CONT: { /* restart after signal. */
285	ret = -EIO;
7ed20e1a	286	if (!valid_signal(data))
1da177e4 LT	287	break;
	288	if (request == PTRACE_SYSCALL)
	289	set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
	290	else
	291	clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
	292	child->exit_code = data;
	293	/* make sure the single step bit is not set. */
	294	clear_single_step(child);
	295	wake_up_process(child);
	296	ret = 0;
	297	break;
	298	}
	299
	300	/*
	301	* make the child exit. Best I can do is send it a sigkill.
	302	* perhaps it should be put in the status that it wants to
	303	* exit.
	304	*/
	305	case PTRACE_KILL: {
	306	ret = 0;
	307	if (child->exit_state == EXIT_ZOMBIE) /* already dead */
	308	break;
	309	child->exit_code = SIGKILL;
	310	/* make sure the single step bit is not set. */
	311	clear_single_step(child);
	312	wake_up_process(child);
	313	break;
	314	}
	315
	316	case PTRACE_SINGLESTEP: { /* set the trap flag. */
	317	ret = -EIO;
7ed20e1a	318	if (!valid_signal(data))
1da177e4 LT	319	break;
	320	clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
	321	set_single_step(child);
	322	child->exit_code = data;
	323	/* give it a chance to run. */
	324	wake_up_process(child);
	325	ret = 0;
	326	break;
	327	}
	328
fd9648df AB	329	case PTRACE_GET_DEBUGREG: {
	330	ret = -EINVAL;
	331	/* We only support one DABR and no IABRS at the moment */
	332	if (addr > 0)
	333	break;
	334	ret = put_user(child->thread.dabr, (u32 __user *)data);
	335	break;
	336	}
	337
	338	case PTRACE_SET_DEBUGREG:
	339	ret = ptrace_set_debugreg(child, addr, data);
	340	break;
	341
1da177e4 LT	342	case PTRACE_DETACH:
	343	ret = ptrace_detach(child, data);
	344	break;
	345
	346	case PPC_PTRACE_GETREGS: { /* Get GPRs 0 - 31. */
	347	int i;
	348	unsigned long reg = &((unsigned long )child->thread.regs)[0];
	349	unsigned int __user tmp = (unsigned int __user )addr;
	350
	351	for (i = 0; i < 32; i++) {
	352	ret = put_user(*reg, tmp);
	353	if (ret)
	354	break;
	355	reg++;
	356	tmp++;
	357	}
	358	break;
	359	}
	360
	361	case PPC_PTRACE_SETREGS: { /* Set GPRs 0 - 31. */
	362	int i;
	363	unsigned long reg = &((unsigned long )child->thread.regs)[0];
	364	unsigned int __user tmp = (unsigned int __user )addr;
	365
	366	for (i = 0; i < 32; i++) {
	367	ret = get_user(*reg, tmp);
	368	if (ret)
	369	break;
	370	reg++;
	371	tmp++;
	372	}
	373	break;
	374	}
	375
	376	case PPC_PTRACE_GETFPREGS: { /* Get FPRs 0 - 31. */
	377	int i;
	378	unsigned long reg = &((unsigned long )child->thread.fpr)[0];
	379	unsigned int __user tmp = (unsigned int __user )addr;
	380
	381	flush_fp_to_thread(child);
	382
	383	for (i = 0; i < 32; i++) {
	384	ret = put_user(*reg, tmp);
	385	if (ret)
	386	break;
	387	reg++;
	388	tmp++;
	389	}
	390	break;
	391	}
	392
	393	case PPC_PTRACE_SETFPREGS: { /* Get FPRs 0 - 31. */
	394	int i;
	395	unsigned long reg = &((unsigned long )child->thread.fpr)[0];
	396	unsigned int __user tmp = (unsigned int __user )addr;
	397
	398	flush_fp_to_thread(child);
	399
	400	for (i = 0; i < 32; i++) {
	401	ret = get_user(*reg, tmp);
	402	if (ret)
	403	break;
	404	reg++;
	405	tmp++;
406	}
407	break;
408	}
409
df09ce4a AB	410	case PTRACE_GETEVENTMSG:
	411	ret = put_user(child->ptrace_message, (unsigned int __user *) data);
	412	break;
1da177e4	413
962bca7f RJ	414	#ifdef CONFIG_ALTIVEC
	415	case PTRACE_GETVRREGS:
	416	/* Get the child altivec register state. */
	417	flush_altivec_to_thread(child);
	418	ret = get_vrregs((unsigned long __user *)data, child);
	419	break;
	420
	421	case PTRACE_SETVRREGS:
	422	/* Set the child altivec register state. */
	423	flush_altivec_to_thread(child);
	424	ret = set_vrregs(child, (unsigned long __user *)data);
	425	break;
	426	#endif
	427
1da177e4 LT	428	default:
	429	ret = ptrace_request(child, request, addr, data);
	430	break;
	431	}
	432	out_tsk:
	433	put_task_struct(child);
	434	out:
	435	unlock_kernel();
	436	return ret;
	437	}