[deliverable/linux.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/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-ppc64.h"
#else
#include "ptrace-ppc32.h"
#endif

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

/*
 * Get contents of register REGNO in task TASK.
 */
unsigned long ptrace_get_reg(struct task_struct *task, int regno)
{
	unsigned long tmp = 0;

	if (task->thread.regs == NULL)
		return -EIO;

	if (regno == PT_MSR) {
		tmp = ((unsigned long *)task->thread.regs)[PT_MSR];
		return PT_MUNGE_MSR(tmp, task);
	}

	if (regno < (sizeof(struct pt_regs) / sizeof(unsigned long)))
		return ((unsigned long *)task->thread.regs)[regno];

	return -EIO;
}

/*
 * Write contents of register REGNO in task TASK.
 */
int ptrace_put_reg(struct task_struct *task, int regno, unsigned long data)
{
	if (task->thread.regs == NULL)
		return -EIO;

	if (regno <= PT_MAX_PUT_REG) {
		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;
}


static int get_fpregs(void __user *data, struct task_struct *task,
		      int has_fpscr)
{
	unsigned int count = has_fpscr ? 33 : 32;

	if (copy_to_user(data, task->thread.fpr, count * sizeof(double)))
		return -EFAULT;
	return 0;
}

static int set_fpregs(void __user *data, struct task_struct *task,
		      int has_fpscr)
{
	unsigned int count = has_fpscr ? 33 : 32;

	if (copy_from_user(task->thread.fpr, data, count * sizeof(double)))
		return -EFAULT;
	return 0;
}


#ifdef CONFIG_ALTIVEC
/*
 * Get/set all the altivec registers vr0..vr31, vscr, vrsave, in one go.
 * The transfer totals 34 quadword.  Quadwords 0-31 contain the
 * corresponding vector registers.  Quadword 32 contains the vscr as the
 * last word (offset 12) within that quadword.  Quadword 33 contains the
 * vrsave as the first word (offset 0) within the quadword.
 *
 * This definition of the VMX state is compatible with the current PPC32
 * ptrace interface.  This allows signal handling and ptrace to use the
 * same structures.  This also simplifies the implementation of a bi-arch
 * (combined (32- and 64-bit) gdb.
 */

/*
 * Get contents of AltiVec register state in task TASK
 */
static int get_vrregs(unsigned long __user *data, struct task_struct *task)
{
	unsigned long regsize;

	/* copy AltiVec registers VR[0] .. VR[31] */
	regsize = 32 * sizeof(vector128);
	if (copy_to_user(data, task->thread.vr, regsize))
		return -EFAULT;
	data += (regsize / sizeof(unsigned long));

	/* copy VSCR */
	regsize = 1 * sizeof(vector128);
	if (copy_to_user(data, &task->thread.vscr, regsize))
		return -EFAULT;
	data += (regsize / sizeof(unsigned long));

	/* copy VRSAVE */
	if (put_user(task->thread.vrsave, (u32 __user *)data))
		return -EFAULT;

	return 0;
}

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

	/* copy AltiVec registers VR[0] .. VR[31] */
	regsize = 32 * sizeof(vector128);
	if (copy_from_user(task->thread.vr, data, regsize))
		return -EFAULT;
	data += (regsize / sizeof(unsigned long));

	/* copy VSCR */
	regsize = 1 * sizeof(vector128);
	if (copy_from_user(&task->thread.vscr, data, regsize))
		return -EFAULT;
	data += (regsize / sizeof(unsigned long));

	/* copy VRSAVE */
	if (get_user(task->thread.vrsave, (u32 __user *)data))
		return -EFAULT;

	return 0;
}
#endif /* CONFIG_ALTIVEC */

#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 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 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 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
	}
	set_tsk_thread_flag(task, TIF_SINGLESTEP);
}

static 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
	}
	clear_tsk_thread_flag(task, TIF_SINGLESTEP);
}

/*
 * 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);
}

/*
 * Here are the old "legacy" powerpc specific getregs/setregs ptrace calls,
 * we mark them as obsolete now, they will be removed in a future version
 */
static long arch_ptrace_old(struct task_struct *child, long request, long addr,
			    long data)
{
	int ret = -EPERM;

	switch(request) {
	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. */
		flush_fp_to_thread(child);
		ret = get_fpregs((void __user *)addr, child, 0);
		break;
	}

	case PPC_PTRACE_SETFPREGS: { /* Get FPRs 0 - 31. */
		flush_fp_to_thread(child);
		ret = set_fpregs((void __user *)addr, child, 0);
		break;
	}

	}
	return ret;
}

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;

		CHECK_FULL_REGS(child->thread.regs);
		if (index < PT_FPR0) {
			tmp = ptrace_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;

		CHECK_FULL_REGS(child->thread.regs);
		if (index == PT_ORIG_R3)
			break;
		if (index < PT_FPR0) {
			ret = ptrace_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;

#ifdef CONFIG_PPC64
	case PTRACE_GETREGS64:
#endif
	case PTRACE_GETREGS: { /* Get all pt_regs from the child. */
		int ui;
	  	if (!access_ok(VERIFY_WRITE, (void __user *)data,
			       sizeof(struct pt_regs))) {
			ret = -EIO;
			break;
		}
		ret = 0;
		for (ui = 0; ui < PT_REGS_COUNT; ui ++) {
			ret |= __put_user(ptrace_get_reg(child, ui),
					  (unsigned long __user *) data);
			data += sizeof(long);
		}
		break;
	}

#ifdef CONFIG_PPC64
	case PTRACE_SETREGS64:
#endif
	case PTRACE_SETREGS: { /* Set all gp regs in the child. */
		unsigned long tmp;
		int ui;
	  	if (!access_ok(VERIFY_READ, (void __user *)data,
			       sizeof(struct pt_regs))) {
			ret = -EIO;
			break;
		}
		ret = 0;
		for (ui = 0; ui < PT_REGS_COUNT; ui ++) {
			ret = __get_user(tmp, (unsigned long __user *) data);
			if (ret)
				break;
			ptrace_put_reg(child, ui, tmp);
			data += sizeof(long);
		}
		break;
	}

	case PTRACE_GETFPREGS: { /* Get the child FPU state (FPR0...31 + FPSCR) */
		flush_fp_to_thread(child);
		ret = get_fpregs((void __user *)data, child, 1);
		break;
	}

	case PTRACE_SETFPREGS: { /* Set the child FPU state (FPR0...31 + FPSCR) */
		flush_fp_to_thread(child);
		ret = set_fpregs((void __user *)data, child, 1);
		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

	/* Old reverse args ptrace callss */
	case PPC_PTRACE_GETREGS: /* Get GPRs 0 - 31. */
	case PPC_PTRACE_SETREGS: /* Set GPRs 0 - 31. */
	case PPC_PTRACE_GETFPREGS: /* Get FPRs 0 - 31. */
	case PPC_PTRACE_SETFPREGS: /* Get FPRs 0 - 31. */
		ret = arch_ptrace_old(child, request, addr, data);
		break;

	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>
1da177e4 LT	22	#include <linux/errno.h>
	23	#include <linux/ptrace.h>
	24	#include <linux/user.h>
	25	#include <linux/security.h>
7ed20e1a	26	#include <linux/signal.h>
ea9c102c DW	27	#include <linux/seccomp.h>
ea9c102c DW	28	#include <linux/audit.h>
e8a30302	29	#ifdef CONFIG_PPC32
ea9c102c	30	#include <linux/module.h>
e8a30302	31	#endif
1da177e4 LT	32
	33	#include <asm/uaccess.h>
	34	#include <asm/page.h>
	35	#include <asm/pgtable.h>
	36	#include <asm/system.h>
21a62902	37
e8a30302	38	#ifdef CONFIG_PPC64
acd89828	39	#include "ptrace-ppc64.h"
1da177e4	40	#else
acd89828	41	#include "ptrace-ppc32.h"
1da177e4	42	#endif
acd89828	43
1da177e4 LT	44	/*
	45	* does not yet catch signals sent when the child dies.
	46	* in exit.c or in signal.c.
	47	*/
	48
865418d8 BH	49	/*
	50	* Get contents of register REGNO in task TASK.
	51	*/
	52	unsigned long ptrace_get_reg(struct task_struct *task, int regno)
	53	{
	54	unsigned long tmp = 0;
	55
	56	if (task->thread.regs == NULL)
	57	return -EIO;
	58
	59	if (regno == PT_MSR) {
	60	tmp = ((unsigned long *)task->thread.regs)[PT_MSR];
	61	return PT_MUNGE_MSR(tmp, task);
	62	}
	63
	64	if (regno < (sizeof(struct pt_regs) / sizeof(unsigned long)))
	65	return ((unsigned long *)task->thread.regs)[regno];
	66
	67	return -EIO;
	68	}
	69
	70	/*
	71	* Write contents of register REGNO in task TASK.
	72	*/
	73	int ptrace_put_reg(struct task_struct *task, int regno, unsigned long data)
	74	{
	75	if (task->thread.regs == NULL)
	76	return -EIO;
	77
	78	if (regno <= PT_MAX_PUT_REG) {
	79	if (regno == PT_MSR)
	80	data = (data & MSR_DEBUGCHANGE)
	81	\| (task->thread.regs->msr & ~MSR_DEBUGCHANGE);
	82	((unsigned long *)task->thread.regs)[regno] = data;
	83	return 0;
	84	}
	85	return -EIO;
	86	}
	87
	88
	89	static int get_fpregs(void __user data, struct task_struct task,
	90	int has_fpscr)
	91	{
	92	unsigned int count = has_fpscr ? 33 : 32;
	93
	94	if (copy_to_user(data, task->thread.fpr, count * sizeof(double)))
	95	return -EFAULT;
	96	return 0;
	97	}
	98
	99	static int set_fpregs(void __user data, struct task_struct task,
	100	int has_fpscr)
	101	{
	102	unsigned int count = has_fpscr ? 33 : 32;
	103
	104	if (copy_from_user(task->thread.fpr, data, count * sizeof(double)))
	105	return -EFAULT;
	106	return 0;
	107	}
	108
	109
	110	#ifdef CONFIG_ALTIVEC
	111	/*
	112	* Get/set all the altivec registers vr0..vr31, vscr, vrsave, in one go.
113	* The transfer totals 34 quadword. Quadwords 0-31 contain the
114	* corresponding vector registers. Quadword 32 contains the vscr as the
115	* last word (offset 12) within that quadword. Quadword 33 contains the
116	* vrsave as the first word (offset 0) within the quadword.
117	*
118	* This definition of the VMX state is compatible with the current PPC32
119	* ptrace interface. This allows signal handling and ptrace to use the
120	* same structures. This also simplifies the implementation of a bi-arch
121	* (combined (32- and 64-bit) gdb.
122	*/
123
124	/*
125	* Get contents of AltiVec register state in task TASK
126	*/
127	static int get_vrregs(unsigned long __user data, struct task_struct task)
128	{
129	unsigned long regsize;
130
131	/* copy AltiVec registers VR[0] .. VR[31] */
132	regsize = 32 * sizeof(vector128);
133	if (copy_to_user(data, task->thread.vr, regsize))
134	return -EFAULT;
135	data += (regsize / sizeof(unsigned long));
136
137	/* copy VSCR */
138	regsize = 1 * sizeof(vector128);
139	if (copy_to_user(data, &task->thread.vscr, regsize))
140	return -EFAULT;
141	data += (regsize / sizeof(unsigned long));
142
143	/* copy VRSAVE */
144	if (put_user(task->thread.vrsave, (u32 __user *)data))
145	return -EFAULT;
146
147	return 0;
148	}
149
150	/*
151	* Write contents of AltiVec register state into task TASK.
152	*/
153	static int set_vrregs(struct task_struct task, unsigned long __user data)
154	{
155	unsigned long regsize;
156
157	/* copy AltiVec registers VR[0] .. VR[31] */
158	regsize = 32 * sizeof(vector128);
159	if (copy_from_user(task->thread.vr, data, regsize))
160	return -EFAULT;
161	data += (regsize / sizeof(unsigned long));
162
163	/* copy VSCR */
164	regsize = 1 * sizeof(vector128);
165	if (copy_from_user(&task->thread.vscr, data, regsize))
166	return -EFAULT;
167	data += (regsize / sizeof(unsigned long));
168
169	/* copy VRSAVE */
170	if (get_user(task->thread.vrsave, (u32 __user *)data))
171	return -EFAULT;
172
173	return 0;
174	}
175	#endif /* CONFIG_ALTIVEC */
176
177	#ifdef CONFIG_SPE
178
179	/*
180	* For get_evrregs/set_evrregs functions 'data' has the following layout:
181	*
182	* struct {
183	* u32 evr[32];
184	* u64 acc;
185	* u32 spefscr;
186	* }
187	*/
188
189	/*
190	* Get contents of SPE register state in task TASK.
191	*/
192	static int get_evrregs(unsigned long data, struct task_struct task)
193	{
194	int i;
195
196	if (!access_ok(VERIFY_WRITE, data, 35 * sizeof(unsigned long)))
197	return -EFAULT;
198
199	/* copy SPEFSCR */
200	if (__put_user(task->thread.spefscr, &data[34]))
201	return -EFAULT;
202
203	/* copy SPE registers EVR[0] .. EVR[31] */
204	for (i = 0; i < 32; i++, data++)
205	if (__put_user(task->thread.evr[i], data))
206	return -EFAULT;
207
208	/* copy ACC */
209	if (__put_user64(task->thread.acc, (unsigned long long *)data))
210	return -EFAULT;
211
212	return 0;
213	}
214
215	/*
216	* Write contents of SPE register state into task TASK.
217	*/
218	static int set_evrregs(struct task_struct task, unsigned long data)
219	{
220	int i;
221
222	if (!access_ok(VERIFY_READ, data, 35 * sizeof(unsigned long)))
223	return -EFAULT;
224
225	/* copy SPEFSCR */
226	if (__get_user(task->thread.spefscr, &data[34]))
227	return -EFAULT;
228
229	/* copy SPE registers EVR[0] .. EVR[31] */
230	for (i = 0; i < 32; i++, data++)
231	if (__get_user(task->thread.evr[i], data))
232	return -EFAULT;
233	/* copy ACC */
234	if (__get_user64(task->thread.acc, (unsigned long long*)data))
235	return -EFAULT;
236
237	return 0;
238	}
239	#endif /* CONFIG_SPE */
240
241
242	static void set_single_step(struct task_struct *task)
243	{
244	struct pt_regs *regs = task->thread.regs;
245
246	if (regs != NULL) {
247	#if defined(CONFIG_40x) \|\| defined(CONFIG_BOOKE)
248	task->thread.dbcr0 = DBCR0_IDM \| DBCR0_IC;
249	regs->msr \|= MSR_DE;
250	#else
251	regs->msr \|= MSR_SE;
252	#endif
253	}
254	set_tsk_thread_flag(task, TIF_SINGLESTEP);
255	}
256
257	static void clear_single_step(struct task_struct *task)
258	{
259	struct pt_regs *regs = task->thread.regs;
260
261	if (regs != NULL) {
262	#if defined(CONFIG_40x) \|\| defined(CONFIG_BOOKE)
263	task->thread.dbcr0 = 0;
264	regs->msr &= ~MSR_DE;
265	#else
266	regs->msr &= ~MSR_SE;
267	#endif
268	}
269	clear_tsk_thread_flag(task, TIF_SINGLESTEP);
270	}
271
1da177e4 LT	272	/*
	273	* Called by kernel/ptrace.c when detaching..
	274	*
	275	* Make sure single step bits etc are not set.
	276	*/
	277	void ptrace_disable(struct task_struct *child)
	278	{
	279	/* make sure the single step bit is not set. */
	280	clear_single_step(child);
	281	}
	282
e17666ba BH	283	/*
	284	* Here are the old "legacy" powerpc specific getregs/setregs ptrace calls,
	285	* we mark them as obsolete now, they will be removed in a future version
	286	*/
	287	static long arch_ptrace_old(struct task_struct *child, long request, long addr,
	288	long data)
	289	{
	290	int ret = -EPERM;
	291
	292	switch(request) {
	293	case PPC_PTRACE_GETREGS: { /* Get GPRs 0 - 31. */
	294	int i;
	295	unsigned long reg = &((unsigned long )child->thread.regs)[0];
	296	unsigned long __user tmp = (unsigned long __user )addr;
	297
	298	for (i = 0; i < 32; i++) {
	299	ret = put_user(*reg, tmp);
	300	if (ret)
	301	break;
	302	reg++;
	303	tmp++;
	304	}
	305	break;
	306	}
	307
	308	case PPC_PTRACE_SETREGS: { /* Set GPRs 0 - 31. */
	309	int i;
	310	unsigned long reg = &((unsigned long )child->thread.regs)[0];
	311	unsigned long __user tmp = (unsigned long __user )addr;
	312
	313	for (i = 0; i < 32; i++) {
	314	ret = get_user(*reg, tmp);
	315	if (ret)
	316	break;
	317	reg++;
	318	tmp++;
	319	}
	320	break;
	321	}
	322
	323	case PPC_PTRACE_GETFPREGS: { /* Get FPRs 0 - 31. */
	324	flush_fp_to_thread(child);
	325	ret = get_fpregs((void __user *)addr, child, 0);
	326	break;
	327	}
	328
	329	case PPC_PTRACE_SETFPREGS: { /* Get FPRs 0 - 31. */
	330	flush_fp_to_thread(child);
	331	ret = set_fpregs((void __user *)addr, child, 0);
	332	break;
	333	}
	334
	335	}
	336	return ret;
	337	}
	338
481bed45	339	long arch_ptrace(struct task_struct *child, long request, long addr, long data)
1da177e4	340	{
1da177e4 LT	341	int ret = -EPERM;
1da177e4 LT	342
1da177e4 LT	343	switch (request) {
	344	/* when I and D space are separate, these will need to be fixed. */
	345	case PTRACE_PEEKTEXT: /* read word at location addr. */
	346	case PTRACE_PEEKDATA: {
	347	unsigned long tmp;
	348	int copied;
	349
	350	copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0);
	351	ret = -EIO;
	352	if (copied != sizeof(tmp))
	353	break;
	354	ret = put_user(tmp,(unsigned long __user *) data);
	355	break;
	356	}
	357
	358	/* read the word at location addr in the USER area. */
1da177e4 LT	359	case PTRACE_PEEKUSR: {
	360	unsigned long index, tmp;
	361
	362	ret = -EIO;
	363	/* convert to index and check */
e8a30302	364	#ifdef CONFIG_PPC32
1da177e4	365	index = (unsigned long) addr >> 2;
e8a30302 SR	366	if ((addr & 3) \|\| (index > PT_FPSCR)
	367	\|\| (child->thread.regs == NULL))
	368	#else
	369	index = (unsigned long) addr >> 3;
	370	if ((addr & 7) \|\| (index > PT_FPSCR))
	371	#endif
1da177e4 LT	372	break;
	373
	374	CHECK_FULL_REGS(child->thread.regs);
	375	if (index < PT_FPR0) {
865418d8	376	tmp = ptrace_get_reg(child, (int) index);
1da177e4	377	} else {
e8a30302	378	flush_fp_to_thread(child);
1da177e4 LT	379	tmp = ((unsigned long *)child->thread.fpr)[index - PT_FPR0];
	380	}
	381	ret = put_user(tmp,(unsigned long __user *) data);
	382	break;
	383	}
	384
	385	/* If I and D space are separate, this will have to be fixed. */
	386	case PTRACE_POKETEXT: /* write the word at location addr. */
	387	case PTRACE_POKEDATA:
	388	ret = 0;
e8a30302 SR	389	if (access_process_vm(child, addr, &data, sizeof(data), 1)
e8a30302 SR	390	== sizeof(data))
1da177e4 LT	391	break;
	392	ret = -EIO;
	393	break;
	394
	395	/* write the word at location addr in the USER area */
	396	case PTRACE_POKEUSR: {
	397	unsigned long index;
	398
	399	ret = -EIO;
	400	/* convert to index and check */
e8a30302	401	#ifdef CONFIG_PPC32
1da177e4	402	index = (unsigned long) addr >> 2;
e8a30302 SR	403	if ((addr & 3) \|\| (index > PT_FPSCR)
	404	\|\| (child->thread.regs == NULL))
	405	#else
	406	index = (unsigned long) addr >> 3;
	407	if ((addr & 7) \|\| (index > PT_FPSCR))
	408	#endif
1da177e4 LT	409	break;
	410
	411	CHECK_FULL_REGS(child->thread.regs);
	412	if (index == PT_ORIG_R3)
	413	break;
	414	if (index < PT_FPR0) {
865418d8	415	ret = ptrace_put_reg(child, index, data);
1da177e4	416	} else {
e8a30302	417	flush_fp_to_thread(child);
1da177e4 LT	418	((unsigned long *)child->thread.fpr)[index - PT_FPR0] = data;
	419	ret = 0;
	420	}
	421	break;
	422	}
	423
	424	case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
	425	case PTRACE_CONT: { /* restart after signal. */
	426	ret = -EIO;
7ed20e1a	427	if (!valid_signal(data))
1da177e4	428	break;
e8a30302	429	if (request == PTRACE_SYSCALL)
1da177e4	430	set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
e8a30302	431	else
1da177e4	432	clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
1da177e4 LT	433	child->exit_code = data;
	434	/* make sure the single step bit is not set. */
	435	clear_single_step(child);
	436	wake_up_process(child);
	437	ret = 0;
	438	break;
	439	}
	440
	441	/*
	442	* make the child exit. Best I can do is send it a sigkill.
	443	* perhaps it should be put in the status that it wants to
	444	* exit.
	445	*/
	446	case PTRACE_KILL: {
	447	ret = 0;
	448	if (child->exit_state == EXIT_ZOMBIE) /* already dead */
	449	break;
	450	child->exit_code = SIGKILL;
	451	/* make sure the single step bit is not set. */
	452	clear_single_step(child);
	453	wake_up_process(child);
	454	break;
	455	}
	456
	457	case PTRACE_SINGLESTEP: { /* set the trap flag. */
	458	ret = -EIO;
7ed20e1a	459	if (!valid_signal(data))
1da177e4 LT	460	break;
	461	clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
	462	set_single_step(child);
	463	child->exit_code = data;
	464	/* give it a chance to run. */
	465	wake_up_process(child);
	466	ret = 0;
	467	break;
	468	}
	469
e8a30302 SR	470	#ifdef CONFIG_PPC64
	471	case PTRACE_GET_DEBUGREG: {
	472	ret = -EINVAL;
	473	/* We only support one DABR and no IABRS at the moment */
	474	if (addr > 0)
	475	break;
	476	ret = put_user(child->thread.dabr,
	477	(unsigned long __user *)data);
	478	break;
	479	}
	480
	481	case PTRACE_SET_DEBUGREG:
	482	ret = ptrace_set_debugreg(child, addr, data);
	483	break;
	484	#endif
	485
1da177e4 LT	486	case PTRACE_DETACH:
	487	ret = ptrace_detach(child, data);
	488	break;
	489
e17666ba BH	490	#ifdef CONFIG_PPC64
	491	case PTRACE_GETREGS64:
	492	#endif
	493	case PTRACE_GETREGS: { /* Get all pt_regs from the child. */
	494	int ui;
	495	if (!access_ok(VERIFY_WRITE, (void __user *)data,
	496	sizeof(struct pt_regs))) {
	497	ret = -EIO;
	498	break;
	499	}
	500	ret = 0;
	501	for (ui = 0; ui < PT_REGS_COUNT; ui ++) {
865418d8	502	ret \|= __put_user(ptrace_get_reg(child, ui),
e17666ba BH	503	(unsigned long __user *) data);
e17666ba BH	504	data += sizeof(long);
e8a30302 SR	505	}
	506	break;
	507	}
	508
e17666ba BH	509	#ifdef CONFIG_PPC64
	510	case PTRACE_SETREGS64:
	511	#endif
	512	case PTRACE_SETREGS: { /* Set all gp regs in the child. */
	513	unsigned long tmp;
	514	int ui;
	515	if (!access_ok(VERIFY_READ, (void __user *)data,
	516	sizeof(struct pt_regs))) {
	517	ret = -EIO;
	518	break;
	519	}
	520	ret = 0;
	521	for (ui = 0; ui < PT_REGS_COUNT; ui ++) {
	522	ret = __get_user(tmp, (unsigned long __user *) data);
e8a30302 SR	523	if (ret)
e8a30302 SR	524	break;
865418d8	525	ptrace_put_reg(child, ui, tmp);
e17666ba	526	data += sizeof(long);
e8a30302 SR	527	}
	528	break;
	529	}
	530
e17666ba	531	case PTRACE_GETFPREGS: { /* Get the child FPU state (FPR0...31 + FPSCR) */
e8a30302	532	flush_fp_to_thread(child);
e17666ba	533	ret = get_fpregs((void __user *)data, child, 1);
e8a30302 SR	534	break;
	535	}
	536
e17666ba	537	case PTRACE_SETFPREGS: { /* Set the child FPU state (FPR0...31 + FPSCR) */
e8a30302	538	flush_fp_to_thread(child);
e17666ba	539	ret = set_fpregs((void __user *)data, child, 1);
e8a30302 SR	540	break;
e8a30302 SR	541	}
e8a30302	542
1da177e4 LT	543	#ifdef CONFIG_ALTIVEC
	544	case PTRACE_GETVRREGS:
	545	/* Get the child altivec register state. */
e8a30302	546	flush_altivec_to_thread(child);
1da177e4 LT	547	ret = get_vrregs((unsigned long __user *)data, child);
	548	break;
	549
	550	case PTRACE_SETVRREGS:
	551	/* Set the child altivec register state. */
e8a30302	552	flush_altivec_to_thread(child);
1da177e4 LT	553	ret = set_vrregs(child, (unsigned long __user *)data);
	554	break;
	555	#endif
	556	#ifdef CONFIG_SPE
	557	case PTRACE_GETEVRREGS:
	558	/* Get the child spe register state. */
	559	if (child->thread.regs->msr & MSR_SPE)
	560	giveup_spe(child);
	561	ret = get_evrregs((unsigned long __user *)data, child);
	562	break;
	563
	564	case PTRACE_SETEVRREGS:
	565	/* Set the child spe register state. */
	566	/* this is to clear the MSR_SPE bit to force a reload
	567	* of register state from memory */
	568	if (child->thread.regs->msr & MSR_SPE)
	569	giveup_spe(child);
	570	ret = set_evrregs(child, (unsigned long __user *)data);
	571	break;
	572	#endif
	573
e17666ba BH	574	/* Old reverse args ptrace callss */
	575	case PPC_PTRACE_GETREGS: /* Get GPRs 0 - 31. */
	576	case PPC_PTRACE_SETREGS: /* Set GPRs 0 - 31. */
	577	case PPC_PTRACE_GETFPREGS: /* Get FPRs 0 - 31. */
	578	case PPC_PTRACE_SETFPREGS: /* Get FPRs 0 - 31. */
	579	ret = arch_ptrace_old(child, request, addr, data);
	580	break;
	581
1da177e4 LT	582	default:
	583	ret = ptrace_request(child, request, addr, data);
	584	break;
	585	}
1da177e4 LT	586	return ret;
	587	}
	588
ea9c102c	589	static void do_syscall_trace(void)
1da177e4	590	{
ea9c102c DW	591	/* the 0x80 provides a way for the tracing parent to distinguish
ea9c102c DW	592	between a syscall stop and SIGTRAP delivery */
1da177e4 LT	593	ptrace_notify(SIGTRAP \| ((current->ptrace & PT_TRACESYSGOOD)
	594	? 0x80 : 0));
	595
	596	/*
	597	* this isn't the same as continuing with a signal, but it will do
	598	* for normal use. strace only continues with a signal if the
	599	* stopping signal is not SIGTRAP. -brl
	600	*/
	601	if (current->exit_code) {
	602	send_sig(current->exit_code, current, 1);
	603	current->exit_code = 0;
	604	}
	605	}
ea9c102c DW	606
	607	void do_syscall_trace_enter(struct pt_regs *regs)
	608	{
e8a30302	609	secure_computing(regs->gpr[0]);
e8a30302	610
ea9c102c DW	611	if (test_thread_flag(TIF_SYSCALL_TRACE)
	612	&& (current->ptrace & PT_PTRACED))
	613	do_syscall_trace();
	614
cfcd1705 DW	615	if (unlikely(current->audit_context)) {
	616	#ifdef CONFIG_PPC64
	617	if (!test_thread_flag(TIF_32BIT))
	618	audit_syscall_entry(AUDIT_ARCH_PPC64,
	619	regs->gpr[0],
	620	regs->gpr[3], regs->gpr[4],
	621	regs->gpr[5], regs->gpr[6]);
	622	else
e8a30302	623	#endif
cfcd1705 DW	624	audit_syscall_entry(AUDIT_ARCH_PPC,
	625	regs->gpr[0],
	626	regs->gpr[3] & 0xffffffff,
	627	regs->gpr[4] & 0xffffffff,
	628	regs->gpr[5] & 0xffffffff,
	629	regs->gpr[6] & 0xffffffff);
	630	}
ea9c102c DW	631	}
	632
	633	void do_syscall_trace_leave(struct pt_regs *regs)
	634	{
ea9c102c	635	if (unlikely(current->audit_context))
4b9c876a	636	audit_syscall_exit((regs->ccr&0x10000000)?AUDITSC_FAILURE:AUDITSC_SUCCESS,
ea9c102c DW	637	regs->result);
ea9c102c DW	638
e8a30302	639	if ((test_thread_flag(TIF_SYSCALL_TRACE)
1bd79336	640	\|\| test_thread_flag(TIF_SINGLESTEP))
ea9c102c DW	641	&& (current->ptrace & PT_PTRACED))
	642	do_syscall_trace();
	643	}