[deliverable/linux.git] / arch / mips / kernel / ptrace.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/config.h>
#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/audit.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <linux/user.h>
#include <linux/security.h>
#include <linux/signal.h>

#include <asm/byteorder.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>
#include <asm/reg.h>

/*
 * Called by kernel/ptrace.c when detaching..
 *
 * Make sure single step bits etc are not set.
 */
void ptrace_disable(struct task_struct *child)
{
	/* Nothing to do.. */
}

/*
 * Read a general register set.  We always use the 64-bit format, even
 * for 32-bit kernels and for 32-bit processes on a 64-bit kernel.
 * Registers are sign extended to fill the available space.
 */
int ptrace_getregs (struct task_struct *child, __s64 __user *data)
{
	struct pt_regs *regs;
	int i;

	if (!access_ok(VERIFY_WRITE, data, 38 * 8))
		return -EIO;

	regs = task_pt_regs(child);

	for (i = 0; i < 32; i++)
		__put_user (regs->regs[i], data + i);
	__put_user (regs->lo, data + EF_LO - EF_R0);
	__put_user (regs->hi, data + EF_HI - EF_R0);
	__put_user (regs->cp0_epc, data + EF_CP0_EPC - EF_R0);
	__put_user (regs->cp0_badvaddr, data + EF_CP0_BADVADDR - EF_R0);
	__put_user (regs->cp0_status, data + EF_CP0_STATUS - EF_R0);
	__put_user (regs->cp0_cause, data + EF_CP0_CAUSE - EF_R0);

	return 0;
}

/*
 * Write a general register set.  As for PTRACE_GETREGS, we always use
 * the 64-bit format.  On a 32-bit kernel only the lower order half
 * (according to endianness) will be used.
 */
int ptrace_setregs (struct task_struct *child, __s64 __user *data)
{
	struct pt_regs *regs;
	int i;

	if (!access_ok(VERIFY_READ, data, 38 * 8))
		return -EIO;

	regs = task_pt_regs(child);

	for (i = 0; i < 32; i++)
		__get_user (regs->regs[i], data + i);
	__get_user (regs->lo, data + EF_LO - EF_R0);
	__get_user (regs->hi, data + EF_HI - EF_R0);
	__get_user (regs->cp0_epc, data + EF_CP0_EPC - EF_R0);

	/* badvaddr, status, and cause may not be written.  */

	return 0;
}

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

	if (!access_ok(VERIFY_WRITE, data, 33 * 8))
		return -EIO;

	if (tsk_used_math(child)) {
		fpureg_t *fregs = get_fpu_regs(child);
		for (i = 0; i < 32; i++)
			__put_user (fregs[i], i + (__u64 __user *) data);
	} else {
		for (i = 0; i < 32; i++)
			__put_user ((__u64) -1, i + (__u64 __user *) data);
	}

	if (cpu_has_fpu) {
		unsigned int flags, tmp;

		__put_user (child->thread.fpu.hard.fcr31, data + 64);

		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();
		__put_user (tmp, data + 65);
	} else {
		__put_user (child->thread.fpu.soft.fcr31, data + 64);
		__put_user ((__u32) 0, data + 65);
	}

	return 0;
}

int ptrace_setfpregs (struct task_struct *child, __u32 __user *data)
{
	fpureg_t *fregs;
	int i;

	if (!access_ok(VERIFY_READ, data, 33 * 8))
		return -EIO;

	fregs = get_fpu_regs(child);

	for (i = 0; i < 32; i++)
		__get_user (fregs[i], i + (__u64 __user *) data);

	if (cpu_has_fpu)
		__get_user (child->thread.fpu.hard.fcr31, data + 64);
	else
		__get_user (child->thread.fpu.soft.fcr31, data + 64);

	/* FIR may not be written.  */

	return 0;
}

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

	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 long 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 long __user *) data);
		break;
	}

	/* Read the word at location addr in the USER area. */
	case PTRACE_PEEKUSR: {
		struct pt_regs *regs;
		unsigned long tmp = 0;

		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);

#ifdef CONFIG_32BIT
				/*
				 * 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);
#endif
#ifdef CONFIG_64BIT
				tmp = fregs[addr - FPR_BASE];
#endif
			} 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: {
			dspreg_t *dregs;

			if (!cpu_has_dsp) {
				tmp = 0;
				ret = -EIO;
				goto out;
			}
			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;
			}
			tmp = child->thread.dsp.dspcontrol;
			break;
		default:
			tmp = 0;
			ret = -EIO;
			goto out;
		}
		ret = put_user(tmp, (unsigned long __user *) 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;

	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;
			}
#ifdef CONFIG_32BIT
			/*
			 * 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;
				fregs[addr - FPR_BASE] |= data;
			}
#endif
#ifdef CONFIG_64BIT
			fregs[addr - FPR_BASE] = data;
#endif
			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: {
			dspreg_t *dregs;

			if (!cpu_has_dsp) {
				ret = -EIO;
				break;
			}

			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 *) data);
		break;

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

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

	case PTRACE_SETFPREGS:
		ret = ptrace_setfpregs (child, (__u32 __user *) 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_DETACH: /* detach a process that was attached. */
		ret = ptrace_detach(child, data);
		break;

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

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

static inline int audit_arch(void)
{
	int arch = EM_MIPS;
#ifdef CONFIG_64BIT
	arch |=  __AUDIT_ARCH_64BIT;
#endif
#if defined(__LITTLE_ENDIAN)
	arch |=  __AUDIT_ARCH_LE;
#endif
	return arch;
}

/*
 * Notification of system call entry/exit
 * - triggered by current->work.syscall_trace
 */
asmlinkage void do_syscall_trace(struct pt_regs *regs, int entryexit)
{
	if (unlikely(current->audit_context) && entryexit)
		audit_syscall_exit(current, AUDITSC_RESULT(regs->regs[2]),
		                   regs->regs[2]);

	if (!(current->ptrace & PT_PTRACED))
		goto out;
	if (!test_thread_flag(TIF_SYSCALL_TRACE))
		goto out;

	/* 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;
	}
 out:
	if (unlikely(current->audit_context) && !entryexit)
		audit_syscall_entry(current, audit_arch(), regs->regs[2],
				    regs->regs[4], regs->regs[5],
				    regs->regs[6], regs->regs[7]);
}
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/config.h>
	18	#include <linux/compiler.h>
	19	#include <linux/kernel.h>
	20	#include <linux/sched.h>
	21	#include <linux/mm.h>
	22	#include <linux/errno.h>
	23	#include <linux/ptrace.h>
	24	#include <linux/audit.h>
	25	#include <linux/smp.h>
	26	#include <linux/smp_lock.h>
	27	#include <linux/user.h>
	28	#include <linux/security.h>
7ed20e1a	29	#include <linux/signal.h>
1da177e4	30
f8280c8d	31	#include <asm/byteorder.h>
1da177e4	32	#include <asm/cpu.h>
e50c0a8f	33	#include <asm/dsp.h>
1da177e4 LT	34	#include <asm/fpu.h>
1da177e4 LT	35	#include <asm/mipsregs.h>
101b3531	36	#include <asm/mipsmtregs.h>
1da177e4 LT	37	#include <asm/pgtable.h>
	38	#include <asm/page.h>
	39	#include <asm/system.h>
	40	#include <asm/uaccess.h>
	41	#include <asm/bootinfo.h>
ea3d710f	42	#include <asm/reg.h>
1da177e4 LT	43
	44	/*
	45	* Called by kernel/ptrace.c when detaching..
	46	*
	47	* Make sure single step bits etc are not set.
	48	*/
	49	void ptrace_disable(struct task_struct *child)
	50	{
	51	/* Nothing to do.. */
	52	}
	53
ea3d710f DJ	54	/*
	55	* Read a general register set. We always use the 64-bit format, even
	56	* for 32-bit kernels and for 32-bit processes on a 64-bit kernel.
	57	* Registers are sign extended to fill the available space.
	58	*/
	59	int ptrace_getregs (struct task_struct child, __s64 __user data)
	60	{
	61	struct pt_regs *regs;
	62	int i;
	63
	64	if (!access_ok(VERIFY_WRITE, data, 38 * 8))
	65	return -EIO;
	66
40bc9c67	67	regs = task_pt_regs(child);
ea3d710f DJ	68
	69	for (i = 0; i < 32; i++)
	70	__put_user (regs->regs[i], data + i);
	71	__put_user (regs->lo, data + EF_LO - EF_R0);
	72	__put_user (regs->hi, data + EF_HI - EF_R0);
	73	__put_user (regs->cp0_epc, data + EF_CP0_EPC - EF_R0);
	74	__put_user (regs->cp0_badvaddr, data + EF_CP0_BADVADDR - EF_R0);
	75	__put_user (regs->cp0_status, data + EF_CP0_STATUS - EF_R0);
	76	__put_user (regs->cp0_cause, data + EF_CP0_CAUSE - EF_R0);
	77
	78	return 0;
	79	}
	80
	81	/*
	82	* Write a general register set. As for PTRACE_GETREGS, we always use
	83	* the 64-bit format. On a 32-bit kernel only the lower order half
	84	* (according to endianness) will be used.
	85	*/
	86	int ptrace_setregs (struct task_struct child, __s64 __user data)
	87	{
	88	struct pt_regs *regs;
	89	int i;
	90
	91	if (!access_ok(VERIFY_READ, data, 38 * 8))
	92	return -EIO;
	93
40bc9c67	94	regs = task_pt_regs(child);
ea3d710f DJ	95
	96	for (i = 0; i < 32; i++)
	97	__get_user (regs->regs[i], data + i);
	98	__get_user (regs->lo, data + EF_LO - EF_R0);
	99	__get_user (regs->hi, data + EF_HI - EF_R0);
	100	__get_user (regs->cp0_epc, data + EF_CP0_EPC - EF_R0);
	101
	102	/* badvaddr, status, and cause may not be written. */
	103
	104	return 0;
	105	}
	106
	107	int ptrace_getfpregs (struct task_struct child, __u32 __user data)
	108	{
	109	int i;
	110
	111	if (!access_ok(VERIFY_WRITE, data, 33 * 8))
	112	return -EIO;
	113
	114	if (tsk_used_math(child)) {
	115	fpureg_t *fregs = get_fpu_regs(child);
	116	for (i = 0; i < 32; i++)
	117	__put_user (fregs[i], i + (__u64 __user *) data);
	118	} else {
	119	for (i = 0; i < 32; i++)
	120	__put_user ((__u64) -1, i + (__u64 __user *) data);
	121	}
	122
	123	if (cpu_has_fpu) {
	124	unsigned int flags, tmp;
	125
	126	__put_user (child->thread.fpu.hard.fcr31, data + 64);
	127
101b3531 RB	128	preempt_disable();
	129	if (cpu_has_mipsmt) {
	130	unsigned int vpflags = dvpe();
	131	flags = read_c0_status();
	132	__enable_fpu();
	133	__asm__ __volatile__("cfc1\t%0,$0" : "=r" (tmp));
	134	write_c0_status(flags);
	135	evpe(vpflags);
	136	} else {
	137	flags = read_c0_status();
	138	__enable_fpu();
	139	__asm__ __volatile__("cfc1\t%0,$0" : "=r" (tmp));
	140	write_c0_status(flags);
	141	}
	142	preempt_enable();
ea3d710f DJ	143	__put_user (tmp, data + 65);
	144	} else {
	145	__put_user (child->thread.fpu.soft.fcr31, data + 64);
	146	__put_user ((__u32) 0, data + 65);
	147	}
	148
	149	return 0;
	150	}
	151
	152	int ptrace_setfpregs (struct task_struct child, __u32 __user data)
	153	{
	154	fpureg_t *fregs;
	155	int i;
	156
	157	if (!access_ok(VERIFY_READ, data, 33 * 8))
	158	return -EIO;
	159
	160	fregs = get_fpu_regs(child);
	161
	162	for (i = 0; i < 32; i++)
	163	__get_user (fregs[i], i + (__u64 __user *) data);
	164
	165	if (cpu_has_fpu)
	166	__get_user (child->thread.fpu.hard.fcr31, data + 64);
	167	else
	168	__get_user (child->thread.fpu.soft.fcr31, data + 64);
	169
	170	/* FIR may not be written. */
	171
	172	return 0;
	173	}
	174
481bed45	175	long arch_ptrace(struct task_struct *child, long request, long addr, long data)
1da177e4	176	{
1da177e4 LT	177	int ret;
1da177e4 LT	178
1da177e4 LT	179	switch (request) {
	180	/* when I and D space are separate, these will need to be fixed. */
	181	case PTRACE_PEEKTEXT: /* read word at location addr. */
	182	case PTRACE_PEEKDATA: {
	183	unsigned long tmp;
	184	int copied;
	185
	186	copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0);
	187	ret = -EIO;
	188	if (copied != sizeof(tmp))
	189	break;
fe00f943	190	ret = put_user(tmp,(unsigned long __user *) data);
1da177e4 LT	191	break;
	192	}
	193
	194	/* Read the word at location addr in the USER area. */
	195	case PTRACE_PEEKUSR: {
	196	struct pt_regs *regs;
	197	unsigned long tmp = 0;
	198
40bc9c67	199	regs = task_pt_regs(child);
1da177e4 LT	200	ret = 0; /* Default return value. */
	201
	202	switch (addr) {
	203	case 0 ... 31:
	204	tmp = regs->regs[addr];
	205	break;
	206	case FPR_BASE ... FPR_BASE + 31:
	207	if (tsk_used_math(child)) {
	208	fpureg_t *fregs = get_fpu_regs(child);
	209
875d43e7	210	#ifdef CONFIG_32BIT
1da177e4 LT	211	/*
	212	* The odd registers are actually the high
	213	* order bits of the values stored in the even
	214	* registers - unless we're using r2k_switch.S.
	215	*/
	216	if (addr & 1)
	217	tmp = (unsigned long) (fregs[((addr & ~1) - 32)] >> 32);
	218	else
	219	tmp = (unsigned long) (fregs[(addr - 32)] & 0xffffffff);
	220	#endif
875d43e7	221	#ifdef CONFIG_64BIT
1da177e4 LT	222	tmp = fregs[addr - FPR_BASE];
	223	#endif
	224	} else {
	225	tmp = -1; /* FP not yet used */
	226	}
	227	break;
	228	case PC:
	229	tmp = regs->cp0_epc;
	230	break;
	231	case CAUSE:
	232	tmp = regs->cp0_cause;
	233	break;
	234	case BADVADDR:
	235	tmp = regs->cp0_badvaddr;
	236	break;
	237	case MMHI:
	238	tmp = regs->hi;
	239	break;
	240	case MMLO:
	241	tmp = regs->lo;
	242	break;
	243	case FPC_CSR:
	244	if (cpu_has_fpu)
	245	tmp = child->thread.fpu.hard.fcr31;
	246	else
	247	tmp = child->thread.fpu.soft.fcr31;
	248	break;
	249	case FPC_EIR: { /* implementation / version register */
	250	unsigned int flags;
	251
	252	if (!cpu_has_fpu)
	253	break;
	254
101b3531 RB	255	preempt_disable();
	256	if (cpu_has_mipsmt) {
	257	unsigned int vpflags = dvpe();
	258	flags = read_c0_status();
	259	__enable_fpu();
	260	__asm__ __volatile__("cfc1\t%0,$0": "=r" (tmp));
	261	write_c0_status(flags);
	262	evpe(vpflags);
	263	} else {
	264	flags = read_c0_status();
	265	__enable_fpu();
	266	__asm__ __volatile__("cfc1\t%0,$0": "=r" (tmp));
	267	write_c0_status(flags);
	268	}
	269	preempt_enable();
1da177e4 LT	270	break;
1da177e4 LT	271	}
c134a5ec RB	272	case DSP_BASE ... DSP_BASE + 5: {
	273	dspreg_t *dregs;
	274
e50c0a8f RB	275	if (!cpu_has_dsp) {
	276	tmp = 0;
	277	ret = -EIO;
481bed45	278	goto out;
e50c0a8f	279	}
6c355852 RB	280	dregs = __get_dsp_regs(child);
6c355852 RB	281	tmp = (unsigned long) (dregs[addr - DSP_BASE]);
e50c0a8f	282	break;
c134a5ec	283	}
e50c0a8f RB	284	case DSP_CONTROL:
	285	if (!cpu_has_dsp) {
	286	tmp = 0;
	287	ret = -EIO;
481bed45	288	goto out;
e50c0a8f RB	289	}
	290	tmp = child->thread.dsp.dspcontrol;
	291	break;
1da177e4 LT	292	default:
	293	tmp = 0;
	294	ret = -EIO;
481bed45	295	goto out;
1da177e4	296	}
fe00f943	297	ret = put_user(tmp, (unsigned long __user *) data);
1da177e4 LT	298	break;
	299	}
	300
	301	/* when I and D space are separate, this will have to be fixed. */
	302	case PTRACE_POKETEXT: /* write the word at location addr. */
	303	case PTRACE_POKEDATA:
	304	ret = 0;
	305	if (access_process_vm(child, addr, &data, sizeof(data), 1)
	306	== sizeof(data))
	307	break;
	308	ret = -EIO;
	309	break;
	310
	311	case PTRACE_POKEUSR: {
	312	struct pt_regs *regs;
	313	ret = 0;
40bc9c67	314	regs = task_pt_regs(child);
1da177e4 LT	315
	316	switch (addr) {
	317	case 0 ... 31:
	318	regs->regs[addr] = data;
	319	break;
	320	case FPR_BASE ... FPR_BASE + 31: {
	321	fpureg_t *fregs = get_fpu_regs(child);
	322
	323	if (!tsk_used_math(child)) {
	324	/* FP not yet used */
	325	memset(&child->thread.fpu.hard, ~0,
	326	sizeof(child->thread.fpu.hard));
	327	child->thread.fpu.hard.fcr31 = 0;
	328	}
875d43e7	329	#ifdef CONFIG_32BIT
1da177e4 LT	330	/*
	331	* The odd registers are actually the high order bits
	332	* of the values stored in the even registers - unless
	333	* we're using r2k_switch.S.
	334	*/
	335	if (addr & 1) {
	336	fregs[(addr & ~1) - FPR_BASE] &= 0xffffffff;
	337	fregs[(addr & ~1) - FPR_BASE] \|= ((unsigned long long) data) << 32;
	338	} else {
	339	fregs[addr - FPR_BASE] &= ~0xffffffffLL;
	340	fregs[addr - FPR_BASE] \|= data;
	341	}
	342	#endif
875d43e7	343	#ifdef CONFIG_64BIT
1da177e4 LT	344	fregs[addr - FPR_BASE] = data;
	345	#endif
	346	break;
	347	}
	348	case PC:
	349	regs->cp0_epc = data;
	350	break;
	351	case MMHI:
	352	regs->hi = data;
	353	break;
	354	case MMLO:
	355	regs->lo = data;
	356	break;
	357	case FPC_CSR:
	358	if (cpu_has_fpu)
	359	child->thread.fpu.hard.fcr31 = data;
	360	else
	361	child->thread.fpu.soft.fcr31 = data;
	362	break;
c134a5ec RB	363	case DSP_BASE ... DSP_BASE + 5: {
	364	dspreg_t *dregs;
	365
e50c0a8f RB	366	if (!cpu_has_dsp) {
	367	ret = -EIO;
	368	break;
	369	}
	370
c134a5ec	371	dregs = __get_dsp_regs(child);
e50c0a8f RB	372	dregs[addr - DSP_BASE] = data;
e50c0a8f RB	373	break;
c134a5ec	374	}
e50c0a8f RB	375	case DSP_CONTROL:
	376	if (!cpu_has_dsp) {
	377	ret = -EIO;
	378	break;
	379	}
	380	child->thread.dsp.dspcontrol = data;
	381	break;
1da177e4 LT	382	default:
	383	/* The rest are not allowed. */
	384	ret = -EIO;
	385	break;
	386	}
	387	break;
	388	}
	389
ea3d710f DJ	390	case PTRACE_GETREGS:
	391	ret = ptrace_getregs (child, (__u64 __user *) data);
	392	break;
	393
	394	case PTRACE_SETREGS:
	395	ret = ptrace_setregs (child, (__u64 __user *) data);
	396	break;
	397
	398	case PTRACE_GETFPREGS:
	399	ret = ptrace_getfpregs (child, (__u32 __user *) data);
	400	break;
	401
	402	case PTRACE_SETFPREGS:
	403	ret = ptrace_setfpregs (child, (__u32 __user *) data);
	404	break;
	405
1da177e4 LT	406	case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
	407	case PTRACE_CONT: { /* restart after signal. */
	408	ret = -EIO;
7ed20e1a	409	if (!valid_signal(data))
1da177e4 LT	410	break;
	411	if (request == PTRACE_SYSCALL) {
	412	set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
	413	}
	414	else {
	415	clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
	416	}
	417	child->exit_code = data;
	418	wake_up_process(child);
	419	ret = 0;
	420	break;
	421	}
	422
	423	/*
	424	* make the child exit. Best I can do is send it a sigkill.
	425	* perhaps it should be put in the status that it wants to
	426	* exit.
	427	*/
	428	case PTRACE_KILL:
	429	ret = 0;
	430	if (child->exit_state == EXIT_ZOMBIE) /* already dead */
	431	break;
	432	child->exit_code = SIGKILL;
	433	wake_up_process(child);
	434	break;
	435
	436	case PTRACE_DETACH: /* detach a process that was attached. */
	437	ret = ptrace_detach(child, data);
	438	break;
	439
3c37026d RB	440	case PTRACE_GET_THREAD_AREA:
	441	ret = put_user(child->thread_info->tp_value,
	442	(unsigned long __user *) data);
	443	break;
	444
1da177e4 LT	445	default:
	446	ret = ptrace_request(child, request, addr, data);
	447	break;
	448	}
481bed45	449	out:
1da177e4 LT	450	return ret;
	451	}
	452
67eb81e1	453	static inline int audit_arch(void)
2fd6f58b	454	{
f8280c8d	455	int arch = EM_MIPS;
875d43e7	456	#ifdef CONFIG_64BIT
f8280c8d RB	457	arch \|= __AUDIT_ARCH_64BIT;
	458	#endif
	459	#if defined(__LITTLE_ENDIAN)
	460	arch \|= __AUDIT_ARCH_LE;
	461	#endif
	462	return arch;
2fd6f58b	463	}
2fd6f58b	464
1da177e4 LT	465	/*
	466	* Notification of system call entry/exit
	467	* - triggered by current->work.syscall_trace
	468	*/
	469	asmlinkage void do_syscall_trace(struct pt_regs *regs, int entryexit)
	470	{
2fd6f58b	471	if (unlikely(current->audit_context) && entryexit)
f8280c8d RB	472	audit_syscall_exit(current, AUDITSC_RESULT(regs->regs[2]),
f8280c8d RB	473	regs->regs[2]);
1da177e4	474
1da177e4	475	if (!(current->ptrace & PT_PTRACED))
2fd6f58b	476	goto out;
f8280c8d RB	477	if (!test_thread_flag(TIF_SYSCALL_TRACE))
f8280c8d RB	478	goto out;
1da177e4 LT	479
	480	/* The 0x80 provides a way for the tracing parent to distinguish
	481	between a syscall stop and SIGTRAP delivery */
	482	ptrace_notify(SIGTRAP \| ((current->ptrace & PT_TRACESYSGOOD) ?
	483	0x80 : 0));
	484
	485	/*
	486	* this isn't the same as continuing with a signal, but it will do
	487	* for normal use. strace only continues with a signal if the
	488	* stopping signal is not SIGTRAP. -brl
	489	*/
	490	if (current->exit_code) {
	491	send_sig(current->exit_code, current, 1);
	492	current->exit_code = 0;
	493	}
2fd6f58b	494	out:
	495	if (unlikely(current->audit_context) && !entryexit)
	496	audit_syscall_entry(current, audit_arch(), regs->regs[2],
	497	regs->regs[4], regs->regs[5],
	498	regs->regs[6], regs->regs[7]);
1da177e4	499	}