[mirror_ubuntu-bionic-kernel.git] / arch / powerpc / kernel / ptrace.c

/*
 *  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 README.legal in the main directory of
 * this archive for more details.
 */

#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 <linux/seccomp.h>
#include <linux/audit.h>
#ifdef CONFIG_PPC32
#include <linux/module.h>
#endif

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

#ifdef CONFIG_PPC64
#include "ptrace-common.h"
#endif

#ifdef CONFIG_PPC32
/*
 * Set of msr bits that gdb can change on behalf of a process.
 */
#if defined(CONFIG_40x) || defined(CONFIG_BOOKE)
#define MSR_DEBUGCHANGE	0
#else
#define MSR_DEBUGCHANGE	(MSR_SE | MSR_BE)
#endif
#endif /* CONFIG_PPC32 */

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

#ifdef CONFIG_PPC32
/*
 * Get contents of register REGNO in task TASK.
 */
static inline unsigned long get_reg(struct task_struct *task, int regno)
{
	if (regno < sizeof(struct pt_regs) / sizeof(unsigned long)
	    && task->thread.regs != NULL)
		return ((unsigned long *)task->thread.regs)[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)
{
	if (regno <= PT_MQ && task->thread.regs != NULL) {
		if (regno == PT_MSR)
			data = (data & MSR_DEBUGCHANGE)
				| (task->thread.regs->msr & ~MSR_DEBUGCHANGE);
		((unsigned long *)task->thread.regs)[regno] = data;
		return 0;
	}
	return -EIO;
}

#ifdef CONFIG_ALTIVEC
/*
 * Get contents of AltiVec register state in task TASK
 */
static inline int get_vrregs(unsigned long __user *data, struct task_struct *task)
{
	int i, j;

	if (!access_ok(VERIFY_WRITE, data, 133 * sizeof(unsigned long)))
		return -EFAULT;

	/* copy AltiVec registers VR[0] .. VR[31] */
	for (i = 0; i < 32; i++)
		for (j = 0; j < 4; j++, data++)
			if (__put_user(task->thread.vr[i].u[j], data))
				return -EFAULT;

	/* copy VSCR */
	for (i = 0; i < 4; i++, data++)
		if (__put_user(task->thread.vscr.u[i], data))
			return -EFAULT;

        /* copy VRSAVE */
	if (__put_user(task->thread.vrsave, data))
		return -EFAULT;

	return 0;
}

/*
 * Write contents of AltiVec register state into task TASK.
 */
static inline int set_vrregs(struct task_struct *task, unsigned long __user *data)
{
	int i, j;

	if (!access_ok(VERIFY_READ, data, 133 * sizeof(unsigned long)))
		return -EFAULT;

	/* copy AltiVec registers VR[0] .. VR[31] */
	for (i = 0; i < 32; i++)
		for (j = 0; j < 4; j++, data++)
			if (__get_user(task->thread.vr[i].u[j], data))
				return -EFAULT;

	/* copy VSCR */
	for (i = 0; i < 4; i++, data++)
		if (__get_user(task->thread.vscr.u[i], data))
			return -EFAULT;

	/* copy VRSAVE */
	if (__get_user(task->thread.vrsave, data))
		return -EFAULT;

	return 0;
}
#endif

#ifdef CONFIG_SPE

/*
 * For get_evrregs/set_evrregs functions 'data' has the following layout:
 *
 * struct {
 *   u32 evr[32];
 *   u64 acc;
 *   u32 spefscr;
 * }
 */

/*
 * Get contents of SPE register state in task TASK.
 */
static inline int get_evrregs(unsigned long *data, struct task_struct *task)
{
	int i;

	if (!access_ok(VERIFY_WRITE, data, 35 * sizeof(unsigned long)))
		return -EFAULT;

	/* copy SPEFSCR */
	if (__put_user(task->thread.spefscr, &data[34]))
		return -EFAULT;

	/* copy SPE registers EVR[0] .. EVR[31] */
	for (i = 0; i < 32; i++, data++)
		if (__put_user(task->thread.evr[i], data))
			return -EFAULT;

	/* copy ACC */
	if (__put_user64(task->thread.acc, (unsigned long long *)data))
		return -EFAULT;

	return 0;
}

/*
 * Write contents of SPE register state into task TASK.
 */
static inline int set_evrregs(struct task_struct *task, unsigned long *data)
{
	int i;

	if (!access_ok(VERIFY_READ, data, 35 * sizeof(unsigned long)))
		return -EFAULT;

	/* copy SPEFSCR */
	if (__get_user(task->thread.spefscr, &data[34]))
		return -EFAULT;

	/* copy SPE registers EVR[0] .. EVR[31] */
	for (i = 0; i < 32; i++, data++)
		if (__get_user(task->thread.evr[i], data))
			return -EFAULT;
	/* copy ACC */
	if (__get_user64(task->thread.acc, (unsigned long long*)data))
		return -EFAULT;

	return 0;
}
#endif /* CONFIG_SPE */

static inline void
set_single_step(struct task_struct *task)
{
	struct pt_regs *regs = task->thread.regs;

	if (regs != NULL) {
#if defined(CONFIG_40x) || defined(CONFIG_BOOKE)
		task->thread.dbcr0 = DBCR0_IDM | DBCR0_IC;
		regs->msr |= MSR_DE;
#else
		regs->msr |= MSR_SE;
#endif
	}
}

static inline void
clear_single_step(struct task_struct *task)
{
	struct pt_regs *regs = task->thread.regs;

	if (regs != NULL) {
#if defined(CONFIG_40x) || defined(CONFIG_BOOKE)
		task->thread.dbcr0 = 0;
		regs->msr &= ~MSR_DE;
#else
		regs->msr &= ~MSR_SE;
#endif
	}
}
#endif /* CONFIG_PPC32 */

/*
 * Called by kernel/ptrace.c when detaching..
 *
 * Make sure single step bits etc are not set.
 */
void ptrace_disable(struct task_struct *child)
{
	/* make sure the single step bit is not set. */
	clear_single_step(child);
}

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

	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: {
		unsigned long index, tmp;

		ret = -EIO;
		/* convert to index and check */
#ifdef CONFIG_PPC32
		index = (unsigned long) addr >> 2;
		if ((addr & 3) || (index > PT_FPSCR)
		    || (child->thread.regs == NULL))
#else
		index = (unsigned long) addr >> 3;
		if ((addr & 7) || (index > PT_FPSCR))
#endif
			break;

#ifdef CONFIG_PPC32
		CHECK_FULL_REGS(child->thread.regs);
#endif
		if (index < PT_FPR0) {
			tmp = get_reg(child, (int) index);
		} else {
			flush_fp_to_thread(child);
			tmp = ((unsigned long *)child->thread.fpr)[index - PT_FPR0];
		}
		ret = put_user(tmp,(unsigned long __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:
		ret = 0;
		if (access_process_vm(child, addr, &data, sizeof(data), 1)
				== sizeof(data))
			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 */
#ifdef CONFIG_PPC32
		index = (unsigned long) addr >> 2;
		if ((addr & 3) || (index > PT_FPSCR)
		    || (child->thread.regs == NULL))
#else
		index = (unsigned long) addr >> 3;
		if ((addr & 7) || (index > PT_FPSCR))
#endif
			break;

#ifdef CONFIG_PPC32
		CHECK_FULL_REGS(child->thread.regs);
#endif
		if (index == PT_ORIG_R3)
			break;
		if (index < PT_FPR0) {
			ret = put_reg(child, index, data);
		} else {
			flush_fp_to_thread(child);
			((unsigned long *)child->thread.fpr)[index - PT_FPR0] = 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;
	}

#ifdef CONFIG_PPC64
	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,
			       (unsigned long __user *)data);
		break;
	}

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

	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 long __user *tmp = (unsigned long __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 long __user *tmp = (unsigned long __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 long __user *tmp = (unsigned long __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 long __user *tmp = (unsigned long __user *)addr;

		flush_fp_to_thread(child);

		for (i = 0; i < 32; i++) {
			ret = get_user(*reg, tmp);
			if (ret)
				break;
			reg++;
			tmp++;
		}
		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
#ifdef CONFIG_SPE
	case PTRACE_GETEVRREGS:
		/* Get the child spe register state. */
		if (child->thread.regs->msr & MSR_SPE)
			giveup_spe(child);
		ret = get_evrregs((unsigned long __user *)data, child);
		break;

	case PTRACE_SETEVRREGS:
		/* Set the child spe register state. */
		/* this is to clear the MSR_SPE bit to force a reload
		 * of register state from memory */
		if (child->thread.regs->msr & MSR_SPE)
			giveup_spe(child);
		ret = set_evrregs(child, (unsigned long __user *)data);
		break;
#endif

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

	return ret;
}

static void do_syscall_trace(void)
{
	/* 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;
	}
}

void do_syscall_trace_enter(struct pt_regs *regs)
{
	secure_computing(regs->gpr[0]);

	if (test_thread_flag(TIF_SYSCALL_TRACE)
	    && (current->ptrace & PT_PTRACED))
		do_syscall_trace();

	if (unlikely(current->audit_context)) {
#ifdef CONFIG_PPC64
		if (!test_thread_flag(TIF_32BIT))
			audit_syscall_entry(AUDIT_ARCH_PPC64,
					    regs->gpr[0],
					    regs->gpr[3], regs->gpr[4],
					    regs->gpr[5], regs->gpr[6]);
		else
#endif
			audit_syscall_entry(AUDIT_ARCH_PPC,
					    regs->gpr[0],
					    regs->gpr[3] & 0xffffffff,
					    regs->gpr[4] & 0xffffffff,
					    regs->gpr[5] & 0xffffffff,
					    regs->gpr[6] & 0xffffffff);
	}
}

void do_syscall_trace_leave(struct pt_regs *regs)
{
	if (unlikely(current->audit_context))
		audit_syscall_exit((regs->ccr&0x10000000)?AUDITSC_FAILURE:AUDITSC_SUCCESS,
				   regs->result);

	if ((test_thread_flag(TIF_SYSCALL_TRACE)
	     || test_thread_flag(TIF_SINGLESTEP))
	    && (current->ptrace & PT_PTRACED))
		do_syscall_trace();
}
Commit	Line	Data
1da177e4	1	/*
1da177e4 LT	2	* PowerPC version
	3	* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
	4	*
	5	* Derived from "arch/m68k/kernel/ptrace.c"
	6	* Copyright (C) 1994 by Hamish Macdonald
	7	* Taken from linux/kernel/ptrace.c and modified for M680x0.
	8	* linux/kernel/ptrace.c is by Ross Biro 1/23/92, edited by Linus Torvalds
	9	*
	10	* Modified by Cort Dougan (cort@hq.fsmlabs.com)
b123923d	11	* and Paul Mackerras (paulus@samba.org).
1da177e4 LT	12	*
	13	* This file is subject to the terms and conditions of the GNU General
	14	* Public License. See the file README.legal in the main directory of
	15	* this archive for more details.
	16	*/
	17
	18	#include <linux/kernel.h>
	19	#include <linux/sched.h>
	20	#include <linux/mm.h>
	21	#include <linux/smp.h>
	22	#include <linux/smp_lock.h>
	23	#include <linux/errno.h>
	24	#include <linux/ptrace.h>
	25	#include <linux/user.h>
	26	#include <linux/security.h>
7ed20e1a	27	#include <linux/signal.h>
ea9c102c DW	28	#include <linux/seccomp.h>
ea9c102c DW	29	#include <linux/audit.h>
e8a30302	30	#ifdef CONFIG_PPC32
ea9c102c	31	#include <linux/module.h>
e8a30302	32	#endif
1da177e4 LT	33
	34	#include <asm/uaccess.h>
	35	#include <asm/page.h>
	36	#include <asm/pgtable.h>
	37	#include <asm/system.h>
21a62902	38
e8a30302	39	#ifdef CONFIG_PPC64
21a62902	40	#include "ptrace-common.h"
e8a30302	41	#endif
1da177e4	42
e8a30302	43	#ifdef CONFIG_PPC32
1da177e4 LT	44	/*
	45	* Set of msr bits that gdb can change on behalf of a process.
	46	*/
	47	#if defined(CONFIG_40x) \|\| defined(CONFIG_BOOKE)
	48	#define MSR_DEBUGCHANGE 0
	49	#else
	50	#define MSR_DEBUGCHANGE (MSR_SE \| MSR_BE)
	51	#endif
e8a30302	52	#endif /* CONFIG_PPC32 */
1da177e4 LT	53
	54	/*
	55	* does not yet catch signals sent when the child dies.
	56	* in exit.c or in signal.c.
	57	*/
	58
e8a30302	59	#ifdef CONFIG_PPC32
1da177e4 LT	60	/*
	61	* Get contents of register REGNO in task TASK.
	62	*/
	63	static inline unsigned long get_reg(struct task_struct *task, int regno)
	64	{
	65	if (regno < sizeof(struct pt_regs) / sizeof(unsigned long)
	66	&& task->thread.regs != NULL)
	67	return ((unsigned long *)task->thread.regs)[regno];
	68	return (0);
	69	}
	70
	71	/*
	72	* Write contents of register REGNO in task TASK.
	73	*/
	74	static inline int put_reg(struct task_struct *task, int regno,
	75	unsigned long data)
	76	{
	77	if (regno <= PT_MQ && task->thread.regs != NULL) {
	78	if (regno == PT_MSR)
	79	data = (data & MSR_DEBUGCHANGE)
	80	\| (task->thread.regs->msr & ~MSR_DEBUGCHANGE);
	81	((unsigned long *)task->thread.regs)[regno] = data;
	82	return 0;
	83	}
	84	return -EIO;
	85	}
	86
	87	#ifdef CONFIG_ALTIVEC
	88	/*
	89	* Get contents of AltiVec register state in task TASK
	90	*/
	91	static inline int get_vrregs(unsigned long __user data, struct task_struct task)
	92	{
	93	int i, j;
	94
	95	if (!access_ok(VERIFY_WRITE, data, 133 * sizeof(unsigned long)))
	96	return -EFAULT;
	97
	98	/* copy AltiVec registers VR[0] .. VR[31] */
	99	for (i = 0; i < 32; i++)
	100	for (j = 0; j < 4; j++, data++)
	101	if (__put_user(task->thread.vr[i].u[j], data))
	102	return -EFAULT;
	103
	104	/* copy VSCR */
	105	for (i = 0; i < 4; i++, data++)
	106	if (__put_user(task->thread.vscr.u[i], data))
	107	return -EFAULT;
	108
	109	/* copy VRSAVE */
	110	if (__put_user(task->thread.vrsave, data))
	111	return -EFAULT;
	112
	113	return 0;
	114	}
	115
	116	/*
	117	* Write contents of AltiVec register state into task TASK.
	118	*/
	119	static inline int set_vrregs(struct task_struct task, unsigned long __user data)
	120	{
	121	int i, j;
	122
	123	if (!access_ok(VERIFY_READ, data, 133 * sizeof(unsigned long)))
124	return -EFAULT;
125
126	/* copy AltiVec registers VR[0] .. VR[31] */
127	for (i = 0; i < 32; i++)
128	for (j = 0; j < 4; j++, data++)
129	if (__get_user(task->thread.vr[i].u[j], data))
130	return -EFAULT;
131
132	/* copy VSCR */
133	for (i = 0; i < 4; i++, data++)
134	if (__get_user(task->thread.vscr.u[i], data))
135	return -EFAULT;
136
137	/* copy VRSAVE */
138	if (__get_user(task->thread.vrsave, data))
139	return -EFAULT;
140
141	return 0;
142	}
143	#endif
144
145	#ifdef CONFIG_SPE
146
147	/*
148	* For get_evrregs/set_evrregs functions 'data' has the following layout:
149	*
150	* struct {
151	* u32 evr[32];
152	* u64 acc;
153	* u32 spefscr;
154	* }
155	*/
156
157	/*
158	* Get contents of SPE register state in task TASK.
159	*/
160	static inline int get_evrregs(unsigned long data, struct task_struct task)
161	{
162	int i;
163
164	if (!access_ok(VERIFY_WRITE, data, 35 * sizeof(unsigned long)))
165	return -EFAULT;
166
167	/* copy SPEFSCR */
168	if (__put_user(task->thread.spefscr, &data[34]))
169	return -EFAULT;
170
171	/* copy SPE registers EVR[0] .. EVR[31] */
172	for (i = 0; i < 32; i++, data++)
173	if (__put_user(task->thread.evr[i], data))
174	return -EFAULT;
175
176	/* copy ACC */
177	if (__put_user64(task->thread.acc, (unsigned long long *)data))
178	return -EFAULT;
179
180	return 0;
181	}
182
183	/*
184	* Write contents of SPE register state into task TASK.
185	*/
186	static inline int set_evrregs(struct task_struct task, unsigned long data)
187	{
188	int i;
189
190	if (!access_ok(VERIFY_READ, data, 35 * sizeof(unsigned long)))
191	return -EFAULT;
192
193	/* copy SPEFSCR */
194	if (__get_user(task->thread.spefscr, &data[34]))
195	return -EFAULT;
196
197	/* copy SPE registers EVR[0] .. EVR[31] */
198	for (i = 0; i < 32; i++, data++)
199	if (__get_user(task->thread.evr[i], data))
200	return -EFAULT;
201	/* copy ACC */
202	if (__get_user64(task->thread.acc, (unsigned long long*)data))
203	return -EFAULT;
204
205	return 0;
206	}
207	#endif /* CONFIG_SPE */
208
209	static inline void
210	set_single_step(struct task_struct *task)
211	{
212	struct pt_regs *regs = task->thread.regs;
213
214	if (regs != NULL) {
215	#if defined(CONFIG_40x) \|\| defined(CONFIG_BOOKE)
216	task->thread.dbcr0 = DBCR0_IDM \| DBCR0_IC;
217	regs->msr \|= MSR_DE;
218	#else
219	regs->msr \|= MSR_SE;
220	#endif
221	}
222	}
223
224	static inline void
225	clear_single_step(struct task_struct *task)
226	{
227	struct pt_regs *regs = task->thread.regs;
228
229	if (regs != NULL) {
230	#if defined(CONFIG_40x) \|\| defined(CONFIG_BOOKE)
231	task->thread.dbcr0 = 0;
232	regs->msr &= ~MSR_DE;
233	#else
234	regs->msr &= ~MSR_SE;
235	#endif
236	}
237	}
e8a30302	238	#endif /* CONFIG_PPC32 */
1da177e4 LT	239
	240	/*
	241	* Called by kernel/ptrace.c when detaching..
	242	*
	243	* Make sure single step bits etc are not set.
	244	*/
	245	void ptrace_disable(struct task_struct *child)
	246	{
	247	/* make sure the single step bit is not set. */
	248	clear_single_step(child);
	249	}
	250
481bed45	251	long arch_ptrace(struct task_struct *child, long request, long addr, long data)
1da177e4	252	{
1da177e4 LT	253	int ret = -EPERM;
1da177e4 LT	254
1da177e4 LT	255	switch (request) {
	256	/* when I and D space are separate, these will need to be fixed. */
	257	case PTRACE_PEEKTEXT: /* read word at location addr. */
	258	case PTRACE_PEEKDATA: {
	259	unsigned long tmp;
	260	int copied;
	261
	262	copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0);
	263	ret = -EIO;
	264	if (copied != sizeof(tmp))
	265	break;
	266	ret = put_user(tmp,(unsigned long __user *) data);
	267	break;
	268	}
	269
	270	/* read the word at location addr in the USER area. */
1da177e4 LT	271	case PTRACE_PEEKUSR: {
	272	unsigned long index, tmp;
	273
	274	ret = -EIO;
	275	/* convert to index and check */
e8a30302	276	#ifdef CONFIG_PPC32
1da177e4	277	index = (unsigned long) addr >> 2;
e8a30302 SR	278	if ((addr & 3) \|\| (index > PT_FPSCR)
	279	\|\| (child->thread.regs == NULL))
	280	#else
	281	index = (unsigned long) addr >> 3;
	282	if ((addr & 7) \|\| (index > PT_FPSCR))
	283	#endif
1da177e4 LT	284	break;
1da177e4 LT	285
e8a30302	286	#ifdef CONFIG_PPC32
1da177e4	287	CHECK_FULL_REGS(child->thread.regs);
e8a30302	288	#endif
1da177e4 LT	289	if (index < PT_FPR0) {
	290	tmp = get_reg(child, (int) index);
	291	} else {
e8a30302	292	flush_fp_to_thread(child);
1da177e4 LT	293	tmp = ((unsigned long *)child->thread.fpr)[index - PT_FPR0];
	294	}
	295	ret = put_user(tmp,(unsigned long __user *) data);
	296	break;
	297	}
	298
	299	/* If I and D space are separate, this will have to be fixed. */
	300	case PTRACE_POKETEXT: /* write the word at location addr. */
	301	case PTRACE_POKEDATA:
	302	ret = 0;
e8a30302 SR	303	if (access_process_vm(child, addr, &data, sizeof(data), 1)
e8a30302 SR	304	== sizeof(data))
1da177e4 LT	305	break;
	306	ret = -EIO;
	307	break;
	308
	309	/* write the word at location addr in the USER area */
	310	case PTRACE_POKEUSR: {
	311	unsigned long index;
	312
	313	ret = -EIO;
	314	/* convert to index and check */
e8a30302	315	#ifdef CONFIG_PPC32
1da177e4	316	index = (unsigned long) addr >> 2;
e8a30302 SR	317	if ((addr & 3) \|\| (index > PT_FPSCR)
	318	\|\| (child->thread.regs == NULL))
	319	#else
	320	index = (unsigned long) addr >> 3;
	321	if ((addr & 7) \|\| (index > PT_FPSCR))
	322	#endif
1da177e4 LT	323	break;
1da177e4 LT	324
e8a30302	325	#ifdef CONFIG_PPC32
1da177e4	326	CHECK_FULL_REGS(child->thread.regs);
e8a30302	327	#endif
1da177e4 LT	328	if (index == PT_ORIG_R3)
	329	break;
	330	if (index < PT_FPR0) {
	331	ret = put_reg(child, index, data);
	332	} else {
e8a30302	333	flush_fp_to_thread(child);
1da177e4 LT	334	((unsigned long *)child->thread.fpr)[index - PT_FPR0] = data;
	335	ret = 0;
	336	}
	337	break;
	338	}
	339
	340	case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
	341	case PTRACE_CONT: { /* restart after signal. */
	342	ret = -EIO;
7ed20e1a	343	if (!valid_signal(data))
1da177e4	344	break;
e8a30302	345	if (request == PTRACE_SYSCALL)
1da177e4	346	set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
e8a30302	347	else
1da177e4	348	clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
1da177e4 LT	349	child->exit_code = data;
	350	/* make sure the single step bit is not set. */
	351	clear_single_step(child);
	352	wake_up_process(child);
	353	ret = 0;
	354	break;
	355	}
	356
	357	/*
	358	* make the child exit. Best I can do is send it a sigkill.
	359	* perhaps it should be put in the status that it wants to
	360	* exit.
	361	*/
	362	case PTRACE_KILL: {
	363	ret = 0;
	364	if (child->exit_state == EXIT_ZOMBIE) /* already dead */
	365	break;
	366	child->exit_code = SIGKILL;
	367	/* make sure the single step bit is not set. */
	368	clear_single_step(child);
	369	wake_up_process(child);
	370	break;
	371	}
	372
	373	case PTRACE_SINGLESTEP: { /* set the trap flag. */
	374	ret = -EIO;
7ed20e1a	375	if (!valid_signal(data))
1da177e4 LT	376	break;
	377	clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
	378	set_single_step(child);
	379	child->exit_code = data;
	380	/* give it a chance to run. */
	381	wake_up_process(child);
	382	ret = 0;
	383	break;
	384	}
	385
e8a30302 SR	386	#ifdef CONFIG_PPC64
	387	case PTRACE_GET_DEBUGREG: {
	388	ret = -EINVAL;
	389	/* We only support one DABR and no IABRS at the moment */
	390	if (addr > 0)
	391	break;
	392	ret = put_user(child->thread.dabr,
	393	(unsigned long __user *)data);
	394	break;
	395	}
	396
	397	case PTRACE_SET_DEBUGREG:
	398	ret = ptrace_set_debugreg(child, addr, data);
	399	break;
	400	#endif
	401
1da177e4 LT	402	case PTRACE_DETACH:
	403	ret = ptrace_detach(child, data);
	404	break;
	405
e8a30302 SR	406	case PPC_PTRACE_GETREGS: { /* Get GPRs 0 - 31. */
	407	int i;
	408	unsigned long reg = &((unsigned long )child->thread.regs)[0];
	409	unsigned long __user tmp = (unsigned long __user )addr;
	410
	411	for (i = 0; i < 32; i++) {
	412	ret = put_user(*reg, tmp);
	413	if (ret)
	414	break;
	415	reg++;
	416	tmp++;
	417	}
	418	break;
	419	}
	420
	421	case PPC_PTRACE_SETREGS: { /* Set GPRs 0 - 31. */
	422	int i;
	423	unsigned long reg = &((unsigned long )child->thread.regs)[0];
	424	unsigned long __user tmp = (unsigned long __user )addr;
	425
	426	for (i = 0; i < 32; i++) {
	427	ret = get_user(*reg, tmp);
	428	if (ret)
	429	break;
	430	reg++;
	431	tmp++;
	432	}
	433	break;
	434	}
	435
	436	case PPC_PTRACE_GETFPREGS: { /* Get FPRs 0 - 31. */
	437	int i;
	438	unsigned long reg = &((unsigned long )child->thread.fpr)[0];
	439	unsigned long __user tmp = (unsigned long __user )addr;
	440
	441	flush_fp_to_thread(child);
	442
	443	for (i = 0; i < 32; i++) {
	444	ret = put_user(*reg, tmp);
	445	if (ret)
	446	break;
	447	reg++;
	448	tmp++;
	449	}
	450	break;
	451	}
	452
	453	case PPC_PTRACE_SETFPREGS: { /* Get FPRs 0 - 31. */
	454	int i;
	455	unsigned long reg = &((unsigned long )child->thread.fpr)[0];
	456	unsigned long __user tmp = (unsigned long __user )addr;
	457
	458	flush_fp_to_thread(child);
	459
	460	for (i = 0; i < 32; i++) {
	461	ret = get_user(*reg, tmp);
	462	if (ret)
	463	break;
	464	reg++;
	465	tmp++;
	466	}
	467	break;
	468	}
e8a30302	469
1da177e4 LT	470	#ifdef CONFIG_ALTIVEC
	471	case PTRACE_GETVRREGS:
	472	/* Get the child altivec register state. */
e8a30302	473	flush_altivec_to_thread(child);
1da177e4 LT	474	ret = get_vrregs((unsigned long __user *)data, child);
	475	break;
	476
	477	case PTRACE_SETVRREGS:
	478	/* Set the child altivec register state. */
e8a30302	479	flush_altivec_to_thread(child);
1da177e4 LT	480	ret = set_vrregs(child, (unsigned long __user *)data);
	481	break;
	482	#endif
	483	#ifdef CONFIG_SPE
	484	case PTRACE_GETEVRREGS:
	485	/* Get the child spe register state. */
	486	if (child->thread.regs->msr & MSR_SPE)
	487	giveup_spe(child);
	488	ret = get_evrregs((unsigned long __user *)data, child);
	489	break;
	490
	491	case PTRACE_SETEVRREGS:
	492	/* Set the child spe register state. */
	493	/* this is to clear the MSR_SPE bit to force a reload
	494	* of register state from memory */
	495	if (child->thread.regs->msr & MSR_SPE)
	496	giveup_spe(child);
	497	ret = set_evrregs(child, (unsigned long __user *)data);
	498	break;
	499	#endif
	500
	501	default:
	502	ret = ptrace_request(child, request, addr, data);
	503	break;
	504	}
481bed45	505
1da177e4 LT	506	return ret;
	507	}
	508
ea9c102c	509	static void do_syscall_trace(void)
1da177e4	510	{
ea9c102c DW	511	/* the 0x80 provides a way for the tracing parent to distinguish
ea9c102c DW	512	between a syscall stop and SIGTRAP delivery */
1da177e4 LT	513	ptrace_notify(SIGTRAP \| ((current->ptrace & PT_TRACESYSGOOD)
	514	? 0x80 : 0));
	515
	516	/*
	517	* this isn't the same as continuing with a signal, but it will do
	518	* for normal use. strace only continues with a signal if the
	519	* stopping signal is not SIGTRAP. -brl
	520	*/
	521	if (current->exit_code) {
	522	send_sig(current->exit_code, current, 1);
	523	current->exit_code = 0;
	524	}
	525	}
ea9c102c DW	526
	527	void do_syscall_trace_enter(struct pt_regs *regs)
	528	{
e8a30302	529	secure_computing(regs->gpr[0]);
e8a30302	530
ea9c102c DW	531	if (test_thread_flag(TIF_SYSCALL_TRACE)
	532	&& (current->ptrace & PT_PTRACED))
	533	do_syscall_trace();
	534
cfcd1705 DW	535	if (unlikely(current->audit_context)) {
	536	#ifdef CONFIG_PPC64
	537	if (!test_thread_flag(TIF_32BIT))
	538	audit_syscall_entry(AUDIT_ARCH_PPC64,
	539	regs->gpr[0],
	540	regs->gpr[3], regs->gpr[4],
	541	regs->gpr[5], regs->gpr[6]);
	542	else
e8a30302	543	#endif
cfcd1705 DW	544	audit_syscall_entry(AUDIT_ARCH_PPC,
	545	regs->gpr[0],
	546	regs->gpr[3] & 0xffffffff,
	547	regs->gpr[4] & 0xffffffff,
	548	regs->gpr[5] & 0xffffffff,
	549	regs->gpr[6] & 0xffffffff);
	550	}
ea9c102c DW	551	}
	552
	553	void do_syscall_trace_leave(struct pt_regs *regs)
	554	{
ea9c102c	555	if (unlikely(current->audit_context))
4b9c876a	556	audit_syscall_exit((regs->ccr&0x10000000)?AUDITSC_FAILURE:AUDITSC_SUCCESS,
ea9c102c DW	557	regs->result);
ea9c102c DW	558
e8a30302	559	if ((test_thread_flag(TIF_SYSCALL_TRACE)
1bd79336	560	\|\| test_thread_flag(TIF_SINGLESTEP))
ea9c102c DW	561	&& (current->ptrace & PT_PTRACED))
	562	do_syscall_trace();
	563	}