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

/*
 * 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.
 *
 * Copyright (C) 1992 Ross Biro
 * Copyright (C) Linus Torvalds
 * Copyright (C) 1994, 95, 96, 97, 98, 2000 Ralf Baechle
 * Copyright (C) 1996 David S. Miller
 * Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com
 * Copyright (C) 1999 MIPS Technologies, Inc.
 * Copyright (C) 2000 Ulf Carlsson
 *
 * At this time Linux/MIPS64 only supports syscall tracing, even for 32-bit
 * binaries.
 */
#include <linux/compiler.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/errno.h>
#include <linux/ptrace.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <linux/user.h>
#include <linux/security.h>

#include <asm/cpu.h>
#include <asm/dsp.h>
#include <asm/fpu.h>
#include <asm/mipsregs.h>
#include <asm/mipsmtregs.h>
#include <asm/pgtable.h>
#include <asm/page.h>
#include <asm/system.h>
#include <asm/uaccess.h>
#include <asm/bootinfo.h>

int ptrace_getregs (struct task_struct *child, __s64 __user *data);
int ptrace_setregs (struct task_struct *child, __s64 __user *data);

int ptrace_getfpregs (struct task_struct *child, __u32 __user *data);
int ptrace_setfpregs (struct task_struct *child, __u32 __user *data);

/*
 * Tracing a 32-bit process with a 64-bit strace and vice versa will not
 * work.  I don't know how to fix this.
 */
asmlinkage int sys32_ptrace(int request, int pid, int addr, int data)
{
	struct task_struct *child;
	int ret;

#if 0
	printk("ptrace(r=%d,pid=%d,addr=%08lx,data=%08lx)\n",
	       (int) request, (int) pid, (unsigned long) addr,
	       (unsigned long) data);
#endif
	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, (unsigned int *) (unsigned long) 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 PTRACE_PEEKTEXT_3264:
	case 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 *) (unsigned long) 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 *) (unsigned long) data);
		break;
	}

	/* Read the word at location addr in the USER area. */
	case PTRACE_PEEKUSR: {
		struct pt_regs *regs;
		unsigned int tmp;

		regs = task_pt_regs(child);
		ret = 0;  /* Default return value. */

		switch (addr) {
		case 0 ... 31:
			tmp = regs->regs[addr];
			break;
		case FPR_BASE ... FPR_BASE + 31:
			if (tsk_used_math(child)) {
				fpureg_t *fregs = get_fpu_regs(child);

				/*
				 * The odd registers are actually the high
				 * order bits of the values stored in the even
				 * registers - unless we're using r2k_switch.S.
				 */
				if (addr & 1)
					tmp = (unsigned long) (fregs[((addr & ~1) - 32)] >> 32);
				else
					tmp = (unsigned long) (fregs[(addr - 32)] & 0xffffffff);
			} else {
				tmp = -1;	/* FP not yet used  */
			}
			break;
		case PC:
			tmp = regs->cp0_epc;
			break;
		case CAUSE:
			tmp = regs->cp0_cause;
			break;
		case BADVADDR:
			tmp = regs->cp0_badvaddr;
			break;
		case MMHI:
			tmp = regs->hi;
			break;
		case MMLO:
			tmp = regs->lo;
			break;
		case FPC_CSR:
			if (cpu_has_fpu)
				tmp = child->thread.fpu.hard.fcr31;
			else
				tmp = child->thread.fpu.soft.fcr31;
			break;
		case FPC_EIR: {	/* implementation / version register */
			unsigned int flags;

			if (!cpu_has_fpu)
				break;

			preempt_disable();
			if (cpu_has_mipsmt) {
				unsigned int vpflags = dvpe();
				flags = read_c0_status();
				__enable_fpu();
				__asm__ __volatile__("cfc1\t%0,$0": "=r" (tmp));
				write_c0_status(flags);
				evpe(vpflags);
			} else {
				flags = read_c0_status();
				__enable_fpu();
				__asm__ __volatile__("cfc1\t%0,$0": "=r" (tmp));
				write_c0_status(flags);
			}
			preempt_enable();
			break;
		}
		case DSP_BASE ... DSP_BASE + 5:
			if (!cpu_has_dsp) {
				tmp = 0;
				ret = -EIO;
				goto out_tsk;
			}
			dspreg_t *dregs = __get_dsp_regs(child);
			tmp = (unsigned long) (dregs[addr - DSP_BASE]);
			break;
		case DSP_CONTROL:
			if (!cpu_has_dsp) {
				tmp = 0;
				ret = -EIO;
				goto out_tsk;
			}
			tmp = child->thread.dsp.dspcontrol;
			break;
		default:
			tmp = 0;
			ret = -EIO;
			goto out_tsk;
		}
		ret = put_user(tmp, (unsigned *) (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;

	/*
	 * 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 PTRACE_POKETEXT_3264:
	case PTRACE_POKEDATA_3264: {
		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 *) (unsigned long) addr) != 0)
			break;
		ret = 0;
		if (access_process_vm(child, (u64)addrOthers, &data,
					sizeof(data), 1) == sizeof(data))
			break;
		ret = -EIO;
		break;
	}

	case PTRACE_POKEUSR: {
		struct pt_regs *regs;
		ret = 0;
		regs = task_pt_regs(child);

		switch (addr) {
		case 0 ... 31:
			regs->regs[addr] = data;
			break;
		case FPR_BASE ... FPR_BASE + 31: {
			fpureg_t *fregs = get_fpu_regs(child);

			if (!tsk_used_math(child)) {
				/* FP not yet used  */
				memset(&child->thread.fpu.hard, ~0,
				       sizeof(child->thread.fpu.hard));
				child->thread.fpu.hard.fcr31 = 0;
			}
			/*
			 * The odd registers are actually the high order bits
			 * of the values stored in the even registers - unless
			 * we're using r2k_switch.S.
			 */
			if (addr & 1) {
				fregs[(addr & ~1) - FPR_BASE] &= 0xffffffff;
				fregs[(addr & ~1) - FPR_BASE] |= ((unsigned long long) data) << 32;
			} else {
				fregs[addr - FPR_BASE] &= ~0xffffffffLL;
				/* Must cast, lest sign extension fill upper
				   bits!  */
				fregs[addr - FPR_BASE] |= (unsigned int)data;
			}
			break;
		}
		case PC:
			regs->cp0_epc = data;
			break;
		case MMHI:
			regs->hi = data;
			break;
		case MMLO:
			regs->lo = data;
			break;
		case FPC_CSR:
			if (cpu_has_fpu)
				child->thread.fpu.hard.fcr31 = data;
			else
				child->thread.fpu.soft.fcr31 = data;
			break;
		case DSP_BASE ... DSP_BASE + 5:
			if (!cpu_has_dsp) {
				ret = -EIO;
				break;
			}

			dspreg_t *dregs = __get_dsp_regs(child);
			dregs[addr - DSP_BASE] = data;
			break;
		case DSP_CONTROL:
			if (!cpu_has_dsp) {
				ret = -EIO;
				break;
			}
			child->thread.dsp.dspcontrol = data;
			break;
		default:
			/* The rest are not allowed. */
			ret = -EIO;
			break;
		}
		break;
		}

	case PTRACE_GETREGS:
		ret = ptrace_getregs (child, (__u64 __user *) (__u64) data);
		break;

	case PTRACE_SETREGS:
		ret = ptrace_setregs (child, (__u64 __user *) (__u64) data);
		break;

	case PTRACE_GETFPREGS:
		ret = ptrace_getfpregs (child, (__u32 __user *) (__u64) data);
		break;

	case PTRACE_SETFPREGS:
		ret = ptrace_setfpregs (child, (__u32 __user *) (__u64) data);
		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);
		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;
		wake_up_process(child);
		break;

	case PTRACE_GET_THREAD_AREA:
		ret = put_user(task_thread_info(child)->tp_value,
				(unsigned int __user *) (unsigned long) data);
		break;

	case PTRACE_DETACH: /* detach a process that was attached. */
		ret = ptrace_detach(child, data);
		break;

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

	case PTRACE_GET_THREAD_AREA_3264:
		ret = put_user(task_thread_info(child)->tp_value,
				(unsigned long __user *) (unsigned long) data);
		break;

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

out_tsk:
	put_task_struct(child);
out:
	unlock_kernel();
	return ret;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* This file is subject to the terms and conditions of the GNU General Public
	3	* License. See the file "COPYING" in the main directory of this archive
	4	* for more details.
	5	*
	6	* Copyright (C) 1992 Ross Biro
	7	* Copyright (C) Linus Torvalds
	8	* Copyright (C) 1994, 95, 96, 97, 98, 2000 Ralf Baechle
	9	* Copyright (C) 1996 David S. Miller
	10	* Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com
	11	* Copyright (C) 1999 MIPS Technologies, Inc.
	12	* Copyright (C) 2000 Ulf Carlsson
	13	*
	14	* At this time Linux/MIPS64 only supports syscall tracing, even for 32-bit
	15	* binaries.
	16	*/
	17	#include <linux/compiler.h>
	18	#include <linux/kernel.h>
	19	#include <linux/sched.h>
	20	#include <linux/mm.h>
	21	#include <linux/errno.h>
	22	#include <linux/ptrace.h>
	23	#include <linux/smp.h>
	24	#include <linux/smp_lock.h>
	25	#include <linux/user.h>
	26	#include <linux/security.h>
	27
	28	#include <asm/cpu.h>
e50c0a8f	29	#include <asm/dsp.h>
1da177e4 LT	30	#include <asm/fpu.h>
1da177e4 LT	31	#include <asm/mipsregs.h>
101b3531	32	#include <asm/mipsmtregs.h>
1da177e4 LT	33	#include <asm/pgtable.h>
	34	#include <asm/page.h>
	35	#include <asm/system.h>
	36	#include <asm/uaccess.h>
	37	#include <asm/bootinfo.h>
	38
ea3d710f DJ	39	int ptrace_getregs (struct task_struct child, __s64 __user data);
	40	int ptrace_setregs (struct task_struct child, __s64 __user data);
	41
	42	int ptrace_getfpregs (struct task_struct child, __u32 __user data);
	43	int ptrace_setfpregs (struct task_struct child, __u32 __user data);
	44
1da177e4 LT	45	/*
	46	* Tracing a 32-bit process with a 64-bit strace and vice versa will not
	47	* work. I don't know how to fix this.
	48	*/
	49	asmlinkage int sys32_ptrace(int request, int pid, int addr, int data)
	50	{
	51	struct task_struct *child;
	52	int ret;
	53
	54	#if 0
	55	printk("ptrace(r=%d,pid=%d,addr=%08lx,data=%08lx)\n",
	56	(int) request, (int) pid, (unsigned long) addr,
	57	(unsigned long) data);
	58	#endif
	59	lock_kernel();
1da177e4	60	if (request == PTRACE_TRACEME) {
6b9c7ed8	61	ret = ptrace_traceme();
1da177e4 LT	62	goto out;
1da177e4 LT	63	}
1da177e4	64
6b9c7ed8 CH	65	child = ptrace_get_task_struct(pid);
	66	if (IS_ERR(child)) {
	67	ret = PTR_ERR(child);
	68	goto out;
	69	}
1da177e4 LT	70
	71	if (request == PTRACE_ATTACH) {
	72	ret = ptrace_attach(child);
	73	goto out_tsk;
	74	}
	75
	76	ret = ptrace_check_attach(child, request == PTRACE_KILL);
	77	if (ret < 0)
	78	goto out_tsk;
	79
	80	switch (request) {
	81	/* when I and D space are separate, these will need to be fixed. */
	82	case PTRACE_PEEKTEXT: /* read word at location addr. */
	83	case PTRACE_PEEKDATA: {
	84	unsigned int tmp;
	85	int copied;
	86
	87	copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0);
	88	ret = -EIO;
	89	if (copied != sizeof(tmp))
	90	break;
	91	ret = put_user(tmp, (unsigned int *) (unsigned long) data);
	92	break;
	93	}
	94
ea3d710f DJ	95	/*
	96	* Read 4 bytes of the other process' storage
	97	* data is a pointer specifying where the user wants the
	98	* 4 bytes copied into
	99	* addr is a pointer in the user's storage that contains an 8 byte
	100	* address in the other process of the 4 bytes that is to be read
	101	* (this is run in a 32-bit process looking at a 64-bit process)
	102	* when I and D space are separate, these will need to be fixed.
	103	*/
	104	case PTRACE_PEEKTEXT_3264:
	105	case PTRACE_PEEKDATA_3264: {
	106	u32 tmp;
	107	int copied;
	108	u32 __user * addrOthers;
	109
	110	ret = -EIO;
	111
	112	/* Get the addr in the other process that we want to read */
	113	if (get_user(addrOthers, (u32 __user * __user *) (unsigned long) addr) != 0)
	114	break;
	115
	116	copied = access_process_vm(child, (u64)addrOthers, &tmp,
	117	sizeof(tmp), 0);
	118	if (copied != sizeof(tmp))
	119	break;
	120	ret = put_user(tmp, (u32 __user *) (unsigned long) data);
	121	break;
	122	}
	123
1da177e4 LT	124	/* Read the word at location addr in the USER area. */
	125	case PTRACE_PEEKUSR: {
	126	struct pt_regs *regs;
	127	unsigned int tmp;
	128
40bc9c67	129	regs = task_pt_regs(child);
1da177e4 LT	130	ret = 0; /* Default return value. */
	131
	132	switch (addr) {
	133	case 0 ... 31:
	134	tmp = regs->regs[addr];
	135	break;
	136	case FPR_BASE ... FPR_BASE + 31:
	137	if (tsk_used_math(child)) {
	138	fpureg_t *fregs = get_fpu_regs(child);
	139
	140	/*
	141	* The odd registers are actually the high
	142	* order bits of the values stored in the even
	143	* registers - unless we're using r2k_switch.S.
	144	*/
	145	if (addr & 1)
	146	tmp = (unsigned long) (fregs[((addr & ~1) - 32)] >> 32);
	147	else
	148	tmp = (unsigned long) (fregs[(addr - 32)] & 0xffffffff);
	149	} else {
	150	tmp = -1; /* FP not yet used */
	151	}
	152	break;
	153	case PC:
	154	tmp = regs->cp0_epc;
	155	break;
	156	case CAUSE:
	157	tmp = regs->cp0_cause;
	158	break;
	159	case BADVADDR:
	160	tmp = regs->cp0_badvaddr;
	161	break;
	162	case MMHI:
	163	tmp = regs->hi;
	164	break;
	165	case MMLO:
	166	tmp = regs->lo;
	167	break;
	168	case FPC_CSR:
	169	if (cpu_has_fpu)
	170	tmp = child->thread.fpu.hard.fcr31;
	171	else
	172	tmp = child->thread.fpu.soft.fcr31;
	173	break;
	174	case FPC_EIR: { /* implementation / version register */
	175	unsigned int flags;
	176
	177	if (!cpu_has_fpu)
	178	break;
	179
101b3531 RB	180	preempt_disable();
	181	if (cpu_has_mipsmt) {
	182	unsigned int vpflags = dvpe();
	183	flags = read_c0_status();
	184	__enable_fpu();
	185	__asm__ __volatile__("cfc1\t%0,$0": "=r" (tmp));
	186	write_c0_status(flags);
	187	evpe(vpflags);
	188	} else {
	189	flags = read_c0_status();
	190	__enable_fpu();
	191	__asm__ __volatile__("cfc1\t%0,$0": "=r" (tmp));
	192	write_c0_status(flags);
	193	}
	194	preempt_enable();
1da177e4 LT	195	break;
1da177e4 LT	196	}
e50c0a8f RB	197	case DSP_BASE ... DSP_BASE + 5:
	198	if (!cpu_has_dsp) {
	199	tmp = 0;
	200	ret = -EIO;
	201	goto out_tsk;
	202	}
6c355852 RB	203	dspreg_t *dregs = __get_dsp_regs(child);
6c355852 RB	204	tmp = (unsigned long) (dregs[addr - DSP_BASE]);
e50c0a8f RB	205	break;
	206	case DSP_CONTROL:
	207	if (!cpu_has_dsp) {
	208	tmp = 0;
	209	ret = -EIO;
	210	goto out_tsk;
	211	}
	212	tmp = child->thread.dsp.dspcontrol;
	213	break;
1da177e4 LT	214	default:
	215	tmp = 0;
	216	ret = -EIO;
	217	goto out_tsk;
	218	}
	219	ret = put_user(tmp, (unsigned *) (unsigned long) data);
	220	break;
	221	}
	222
	223	/* when I and D space are separate, this will have to be fixed. */
	224	case PTRACE_POKETEXT: /* write the word at location addr. */
	225	case PTRACE_POKEDATA:
	226	ret = 0;
	227	if (access_process_vm(child, addr, &data, sizeof(data), 1)
	228	== sizeof(data))
	229	break;
	230	ret = -EIO;
	231	break;
	232
ea3d710f DJ	233	/*
	234	* Write 4 bytes into the other process' storage
	235	* data is the 4 bytes that the user wants written
	236	* addr is a pointer in the user's storage that contains an
	237	* 8 byte address in the other process where the 4 bytes
	238	* that is to be written
	239	* (this is run in a 32-bit process looking at a 64-bit process)
	240	* when I and D space are separate, these will need to be fixed.
	241	*/
	242	case PTRACE_POKETEXT_3264:
	243	case PTRACE_POKEDATA_3264: {
	244	u32 __user * addrOthers;
	245
	246	/* Get the addr in the other process that we want to write into */
	247	ret = -EIO;
	248	if (get_user(addrOthers, (u32 __user * __user *) (unsigned long) addr) != 0)
	249	break;
	250	ret = 0;
	251	if (access_process_vm(child, (u64)addrOthers, &data,
	252	sizeof(data), 1) == sizeof(data))
	253	break;
	254	ret = -EIO;
	255	break;
	256	}
	257
1da177e4 LT	258	case PTRACE_POKEUSR: {
	259	struct pt_regs *regs;
	260	ret = 0;
40bc9c67	261	regs = task_pt_regs(child);
1da177e4 LT	262
	263	switch (addr) {
	264	case 0 ... 31:
	265	regs->regs[addr] = data;
	266	break;
	267	case FPR_BASE ... FPR_BASE + 31: {
	268	fpureg_t *fregs = get_fpu_regs(child);
	269
	270	if (!tsk_used_math(child)) {
	271	/* FP not yet used */
	272	memset(&child->thread.fpu.hard, ~0,
	273	sizeof(child->thread.fpu.hard));
	274	child->thread.fpu.hard.fcr31 = 0;
	275	}
	276	/*
	277	* The odd registers are actually the high order bits
	278	* of the values stored in the even registers - unless
	279	* we're using r2k_switch.S.
	280	*/
	281	if (addr & 1) {
	282	fregs[(addr & ~1) - FPR_BASE] &= 0xffffffff;
	283	fregs[(addr & ~1) - FPR_BASE] \|= ((unsigned long long) data) << 32;
	284	} else {
	285	fregs[addr - FPR_BASE] &= ~0xffffffffLL;
	286	/* Must cast, lest sign extension fill upper
	287	bits! */
	288	fregs[addr - FPR_BASE] \|= (unsigned int)data;
	289	}
	290	break;
	291	}
	292	case PC:
	293	regs->cp0_epc = data;
	294	break;
	295	case MMHI:
	296	regs->hi = data;
	297	break;
	298	case MMLO:
	299	regs->lo = data;
	300	break;
	301	case FPC_CSR:
	302	if (cpu_has_fpu)
	303	child->thread.fpu.hard.fcr31 = data;
	304	else
	305	child->thread.fpu.soft.fcr31 = data;
	306	break;
e50c0a8f RB	307	case DSP_BASE ... DSP_BASE + 5:
	308	if (!cpu_has_dsp) {
	309	ret = -EIO;
	310	break;
	311	}
	312
	313	dspreg_t *dregs = __get_dsp_regs(child);
	314	dregs[addr - DSP_BASE] = data;
	315	break;
	316	case DSP_CONTROL:
	317	if (!cpu_has_dsp) {
	318	ret = -EIO;
	319	break;
	320	}
	321	child->thread.dsp.dspcontrol = data;
	322	break;
1da177e4 LT	323	default:
	324	/* The rest are not allowed. */
	325	ret = -EIO;
	326	break;
	327	}
	328	break;
	329	}
	330
ea3d710f DJ	331	case PTRACE_GETREGS:
	332	ret = ptrace_getregs (child, (__u64 __user *) (__u64) data);
	333	break;
	334
	335	case PTRACE_SETREGS:
	336	ret = ptrace_setregs (child, (__u64 __user *) (__u64) data);
	337	break;
	338
	339	case PTRACE_GETFPREGS:
	340	ret = ptrace_getfpregs (child, (__u32 __user *) (__u64) data);
	341	break;
	342
	343	case PTRACE_SETFPREGS:
	344	ret = ptrace_setfpregs (child, (__u32 __user *) (__u64) data);
	345	break;
	346
1da177e4 LT	347	case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
	348	case PTRACE_CONT: { /* restart after signal. */
	349	ret = -EIO;
7ed20e1a	350	if (!valid_signal(data))
1da177e4 LT	351	break;
	352	if (request == PTRACE_SYSCALL) {
	353	set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
	354	}
	355	else {
	356	clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
	357	}
	358	child->exit_code = data;
	359	wake_up_process(child);
	360	ret = 0;
	361	break;
	362	}
	363
	364	/*
	365	* make the child exit. Best I can do is send it a sigkill.
	366	* perhaps it should be put in the status that it wants to
	367	* exit.
	368	*/
	369	case PTRACE_KILL:
	370	ret = 0;
	371	if (child->exit_state == EXIT_ZOMBIE) /* already dead */
	372	break;
	373	child->exit_code = SIGKILL;
	374	wake_up_process(child);
	375	break;
	376
3c37026d	377	case PTRACE_GET_THREAD_AREA:
dc8f6029	378	ret = put_user(task_thread_info(child)->tp_value,
3c37026d RB	379	(unsigned int __user *) (unsigned long) data);
	380	break;
	381
1da177e4 LT	382	case PTRACE_DETACH: /* detach a process that was attached. */
	383	ret = ptrace_detach(child, data);
	384	break;
	385
09276d90 RB	386	case PTRACE_GETEVENTMSG:
	387	ret = put_user(child->ptrace_message,
	388	(unsigned int __user *) (unsigned long) data);
	389	break;
	390
ea3d710f	391	case PTRACE_GET_THREAD_AREA_3264:
dc8f6029	392	ret = put_user(task_thread_info(child)->tp_value,
ea3d710f DJ	393	(unsigned long __user *) (unsigned long) data);
	394	break;
	395
1da177e4 LT	396	default:
	397	ret = ptrace_request(child, request, addr, data);
	398	break;
	399	}
	400
	401	out_tsk:
	402	put_task_struct(child);
	403	out:
	404	unlock_kernel();
	405	return ret;
	406	}