[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 || regno == PT_TRAP) {
		if (regno == PT_MSR)
			data = (data & MSR_DEBUGCHANGE)
				| (task->thread.regs->msr & ~MSR_DEBUGCHANGE);
		/* We prevent mucking around with the reserved area of trap
		 * which are used internally by the kernel
		 */
		if (regno == PT_TRAP)
			data &= 0xfff0;
		((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_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
912000e7	78	if (regno <= PT_MAX_PUT_REG \|\| regno == PT_TRAP) {
865418d8 BH	79	if (regno == PT_MSR)
	80	data = (data & MSR_DEBUGCHANGE)
	81	\| (task->thread.regs->msr & ~MSR_DEBUGCHANGE);
912000e7 BH	82	/* We prevent mucking around with the reserved area of trap
	83	* which are used internally by the kernel
	84	*/
	85	if (regno == PT_TRAP)
	86	data &= 0xfff0;
865418d8 BH	87	((unsigned long *)task->thread.regs)[regno] = data;
	88	return 0;
	89	}
	90	return -EIO;
	91	}
	92
	93
	94	static int get_fpregs(void __user data, struct task_struct task,
	95	int has_fpscr)
	96	{
	97	unsigned int count = has_fpscr ? 33 : 32;
	98
	99	if (copy_to_user(data, task->thread.fpr, count * sizeof(double)))
	100	return -EFAULT;
	101	return 0;
	102	}
	103
	104	static int set_fpregs(void __user data, struct task_struct task,
	105	int has_fpscr)
	106	{
	107	unsigned int count = has_fpscr ? 33 : 32;
	108
	109	if (copy_from_user(task->thread.fpr, data, count * sizeof(double)))
	110	return -EFAULT;
	111	return 0;
	112	}
	113
	114
	115	#ifdef CONFIG_ALTIVEC
	116	/*
	117	* Get/set all the altivec registers vr0..vr31, vscr, vrsave, in one go.
	118	* The transfer totals 34 quadword. Quadwords 0-31 contain the
	119	* corresponding vector registers. Quadword 32 contains the vscr as the
	120	* last word (offset 12) within that quadword. Quadword 33 contains the
	121	* vrsave as the first word (offset 0) within the quadword.
	122	*
	123	* This definition of the VMX state is compatible with the current PPC32
	124	* ptrace interface. This allows signal handling and ptrace to use the
	125	* same structures. This also simplifies the implementation of a bi-arch
	126	* (combined (32- and 64-bit) gdb.
	127	*/
	128
	129	/*
	130	* Get contents of AltiVec register state in task TASK
	131	*/
	132	static int get_vrregs(unsigned long __user data, struct task_struct task)
	133	{
	134	unsigned long regsize;
	135
	136	/* copy AltiVec registers VR[0] .. VR[31] */
	137	regsize = 32 * sizeof(vector128);
	138	if (copy_to_user(data, task->thread.vr, regsize))
	139	return -EFAULT;
	140	data += (regsize / sizeof(unsigned long));
	141
	142	/* copy VSCR */
	143	regsize = 1 * sizeof(vector128);
	144	if (copy_to_user(data, &task->thread.vscr, regsize))
	145	return -EFAULT;
	146	data += (regsize / sizeof(unsigned long));
	147
	148	/* copy VRSAVE */
	149	if (put_user(task->thread.vrsave, (u32 __user *)data))
	150	return -EFAULT;
151
152	return 0;
153	}
154
155	/*
156	* Write contents of AltiVec register state into task TASK.
157	*/
158	static int set_vrregs(struct task_struct task, unsigned long __user data)
159	{
160	unsigned long regsize;
161
162	/* copy AltiVec registers VR[0] .. VR[31] */
163	regsize = 32 * sizeof(vector128);
164	if (copy_from_user(task->thread.vr, data, regsize))
165	return -EFAULT;
166	data += (regsize / sizeof(unsigned long));
167
168	/* copy VSCR */
169	regsize = 1 * sizeof(vector128);
170	if (copy_from_user(&task->thread.vscr, data, regsize))
171	return -EFAULT;
172	data += (regsize / sizeof(unsigned long));
173
174	/* copy VRSAVE */
175	if (get_user(task->thread.vrsave, (u32 __user *)data))
176	return -EFAULT;
177
178	return 0;
179	}
180	#endif /* CONFIG_ALTIVEC */
181
182	#ifdef CONFIG_SPE
183
184	/*
185	* For get_evrregs/set_evrregs functions 'data' has the following layout:
186	*
187	* struct {
188	* u32 evr[32];
189	* u64 acc;
190	* u32 spefscr;
191	* }
192	*/
193
194	/*
195	* Get contents of SPE register state in task TASK.
196	*/
197	static int get_evrregs(unsigned long data, struct task_struct task)
198	{
199	int i;
200
201	if (!access_ok(VERIFY_WRITE, data, 35 * sizeof(unsigned long)))
202	return -EFAULT;
203
204	/* copy SPEFSCR */
205	if (__put_user(task->thread.spefscr, &data[34]))
206	return -EFAULT;
207
208	/* copy SPE registers EVR[0] .. EVR[31] */
209	for (i = 0; i < 32; i++, data++)
210	if (__put_user(task->thread.evr[i], data))
211	return -EFAULT;
212
213	/* copy ACC */
214	if (__put_user64(task->thread.acc, (unsigned long long *)data))
215	return -EFAULT;
216
217	return 0;
218	}
219
220	/*
221	* Write contents of SPE register state into task TASK.
222	*/
223	static int set_evrregs(struct task_struct task, unsigned long data)
224	{
225	int i;
226
227	if (!access_ok(VERIFY_READ, data, 35 * sizeof(unsigned long)))
228	return -EFAULT;
229
230	/* copy SPEFSCR */
231	if (__get_user(task->thread.spefscr, &data[34]))
232	return -EFAULT;
233
234	/* copy SPE registers EVR[0] .. EVR[31] */
235	for (i = 0; i < 32; i++, data++)
236	if (__get_user(task->thread.evr[i], data))
237	return -EFAULT;
238	/* copy ACC */
239	if (__get_user64(task->thread.acc, (unsigned long long*)data))
240	return -EFAULT;
241
242	return 0;
243	}
244	#endif /* CONFIG_SPE */
245
246
247	static void set_single_step(struct task_struct *task)
248	{
249	struct pt_regs *regs = task->thread.regs;
250
251	if (regs != NULL) {
252	#if defined(CONFIG_40x) \|\| defined(CONFIG_BOOKE)
253	task->thread.dbcr0 = DBCR0_IDM \| DBCR0_IC;
254	regs->msr \|= MSR_DE;
255	#else
256	regs->msr \|= MSR_SE;
257	#endif
258	}
259	set_tsk_thread_flag(task, TIF_SINGLESTEP);
260	}
261
262	static void clear_single_step(struct task_struct *task)
263	{
264	struct pt_regs *regs = task->thread.regs;
265
266	if (regs != NULL) {
267	#if defined(CONFIG_40x) \|\| defined(CONFIG_BOOKE)
268	task->thread.dbcr0 = 0;
269	regs->msr &= ~MSR_DE;
270	#else
271	regs->msr &= ~MSR_SE;
272	#endif
273	}
274	clear_tsk_thread_flag(task, TIF_SINGLESTEP);
275	}
276
1da177e4 LT	277	/*
	278	* Called by kernel/ptrace.c when detaching..
	279	*
	280	* Make sure single step bits etc are not set.
	281	*/
	282	void ptrace_disable(struct task_struct *child)
	283	{
	284	/* make sure the single step bit is not set. */
	285	clear_single_step(child);
	286	}
	287
e17666ba BH	288	/*
	289	* Here are the old "legacy" powerpc specific getregs/setregs ptrace calls,
	290	* we mark them as obsolete now, they will be removed in a future version
	291	*/
	292	static long arch_ptrace_old(struct task_struct *child, long request, long addr,
	293	long data)
	294	{
	295	int ret = -EPERM;
	296
	297	switch(request) {
	298	case PPC_PTRACE_GETREGS: { /* Get GPRs 0 - 31. */
	299	int i;
	300	unsigned long reg = &((unsigned long )child->thread.regs)[0];
	301	unsigned long __user tmp = (unsigned long __user )addr;
	302
	303	for (i = 0; i < 32; i++) {
	304	ret = put_user(*reg, tmp);
	305	if (ret)
	306	break;
	307	reg++;
	308	tmp++;
	309	}
	310	break;
	311	}
	312
	313	case PPC_PTRACE_SETREGS: { /* Set GPRs 0 - 31. */
	314	int i;
	315	unsigned long reg = &((unsigned long )child->thread.regs)[0];
	316	unsigned long __user tmp = (unsigned long __user )addr;
	317
	318	for (i = 0; i < 32; i++) {
	319	ret = get_user(*reg, tmp);
	320	if (ret)
	321	break;
	322	reg++;
	323	tmp++;
	324	}
	325	break;
	326	}
	327
	328	case PPC_PTRACE_GETFPREGS: { /* Get FPRs 0 - 31. */
	329	flush_fp_to_thread(child);
	330	ret = get_fpregs((void __user *)addr, child, 0);
	331	break;
	332	}
	333
	334	case PPC_PTRACE_SETFPREGS: { /* Get FPRs 0 - 31. */
	335	flush_fp_to_thread(child);
	336	ret = set_fpregs((void __user *)addr, child, 0);
	337	break;
	338	}
	339
	340	}
	341	return ret;
	342	}
	343
481bed45	344	long arch_ptrace(struct task_struct *child, long request, long addr, long data)
1da177e4	345	{
1da177e4 LT	346	int ret = -EPERM;
1da177e4 LT	347
1da177e4 LT	348	switch (request) {
	349	/* when I and D space are separate, these will need to be fixed. */
	350	case PTRACE_PEEKTEXT: /* read word at location addr. */
	351	case PTRACE_PEEKDATA: {
	352	unsigned long tmp;
	353	int copied;
	354
	355	copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0);
	356	ret = -EIO;
	357	if (copied != sizeof(tmp))
	358	break;
	359	ret = put_user(tmp,(unsigned long __user *) data);
	360	break;
	361	}
	362
	363	/* read the word at location addr in the USER area. */
1da177e4 LT	364	case PTRACE_PEEKUSR: {
	365	unsigned long index, tmp;
	366
	367	ret = -EIO;
	368	/* convert to index and check */
e8a30302	369	#ifdef CONFIG_PPC32
1da177e4	370	index = (unsigned long) addr >> 2;
e8a30302 SR	371	if ((addr & 3) \|\| (index > PT_FPSCR)
	372	\|\| (child->thread.regs == NULL))
	373	#else
	374	index = (unsigned long) addr >> 3;
	375	if ((addr & 7) \|\| (index > PT_FPSCR))
	376	#endif
1da177e4 LT	377	break;
	378
	379	CHECK_FULL_REGS(child->thread.regs);
	380	if (index < PT_FPR0) {
865418d8	381	tmp = ptrace_get_reg(child, (int) index);
1da177e4	382	} else {
e8a30302	383	flush_fp_to_thread(child);
1da177e4 LT	384	tmp = ((unsigned long *)child->thread.fpr)[index - PT_FPR0];
	385	}
	386	ret = put_user(tmp,(unsigned long __user *) data);
	387	break;
	388	}
	389
	390	/* If I and D space are separate, this will have to be fixed. */
	391	case PTRACE_POKETEXT: /* write the word at location addr. */
	392	case PTRACE_POKEDATA:
	393	ret = 0;
e8a30302 SR	394	if (access_process_vm(child, addr, &data, sizeof(data), 1)
e8a30302 SR	395	== sizeof(data))
1da177e4 LT	396	break;
	397	ret = -EIO;
	398	break;
	399
	400	/* write the word at location addr in the USER area */
	401	case PTRACE_POKEUSR: {
	402	unsigned long index;
	403
	404	ret = -EIO;
	405	/* convert to index and check */
e8a30302	406	#ifdef CONFIG_PPC32
1da177e4	407	index = (unsigned long) addr >> 2;
e8a30302 SR	408	if ((addr & 3) \|\| (index > PT_FPSCR)
	409	\|\| (child->thread.regs == NULL))
	410	#else
	411	index = (unsigned long) addr >> 3;
	412	if ((addr & 7) \|\| (index > PT_FPSCR))
	413	#endif
1da177e4 LT	414	break;
	415
	416	CHECK_FULL_REGS(child->thread.regs);
1da177e4	417	if (index < PT_FPR0) {
865418d8	418	ret = ptrace_put_reg(child, index, data);
1da177e4	419	} else {
e8a30302	420	flush_fp_to_thread(child);
1da177e4 LT	421	((unsigned long *)child->thread.fpr)[index - PT_FPR0] = data;
	422	ret = 0;
	423	}
	424	break;
	425	}
	426
	427	case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
	428	case PTRACE_CONT: { /* restart after signal. */
	429	ret = -EIO;
7ed20e1a	430	if (!valid_signal(data))
1da177e4	431	break;
e8a30302	432	if (request == PTRACE_SYSCALL)
1da177e4	433	set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
e8a30302	434	else
1da177e4	435	clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
1da177e4 LT	436	child->exit_code = data;
	437	/* make sure the single step bit is not set. */
	438	clear_single_step(child);
	439	wake_up_process(child);
	440	ret = 0;
	441	break;
	442	}
	443
	444	/*
	445	* make the child exit. Best I can do is send it a sigkill.
	446	* perhaps it should be put in the status that it wants to
	447	* exit.
	448	*/
	449	case PTRACE_KILL: {
	450	ret = 0;
	451	if (child->exit_state == EXIT_ZOMBIE) /* already dead */
	452	break;
	453	child->exit_code = SIGKILL;
	454	/* make sure the single step bit is not set. */
	455	clear_single_step(child);
	456	wake_up_process(child);
	457	break;
	458	}
	459
	460	case PTRACE_SINGLESTEP: { /* set the trap flag. */
	461	ret = -EIO;
7ed20e1a	462	if (!valid_signal(data))
1da177e4 LT	463	break;
	464	clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
	465	set_single_step(child);
	466	child->exit_code = data;
	467	/* give it a chance to run. */
	468	wake_up_process(child);
	469	ret = 0;
	470	break;
	471	}
	472
e8a30302 SR	473	#ifdef CONFIG_PPC64
	474	case PTRACE_GET_DEBUGREG: {
	475	ret = -EINVAL;
	476	/* We only support one DABR and no IABRS at the moment */
	477	if (addr > 0)
	478	break;
	479	ret = put_user(child->thread.dabr,
	480	(unsigned long __user *)data);
	481	break;
	482	}
	483
	484	case PTRACE_SET_DEBUGREG:
	485	ret = ptrace_set_debugreg(child, addr, data);
	486	break;
	487	#endif
	488
1da177e4 LT	489	case PTRACE_DETACH:
	490	ret = ptrace_detach(child, data);
	491	break;
	492
e17666ba BH	493	#ifdef CONFIG_PPC64
	494	case PTRACE_GETREGS64:
	495	#endif
	496	case PTRACE_GETREGS: { /* Get all pt_regs from the child. */
	497	int ui;
	498	if (!access_ok(VERIFY_WRITE, (void __user *)data,
	499	sizeof(struct pt_regs))) {
	500	ret = -EIO;
	501	break;
	502	}
	503	ret = 0;
	504	for (ui = 0; ui < PT_REGS_COUNT; ui ++) {
865418d8	505	ret \|= __put_user(ptrace_get_reg(child, ui),
e17666ba BH	506	(unsigned long __user *) data);
e17666ba BH	507	data += sizeof(long);
e8a30302 SR	508	}
	509	break;
	510	}
	511
e17666ba BH	512	#ifdef CONFIG_PPC64
	513	case PTRACE_SETREGS64:
	514	#endif
	515	case PTRACE_SETREGS: { /* Set all gp regs in the child. */
	516	unsigned long tmp;
	517	int ui;
	518	if (!access_ok(VERIFY_READ, (void __user *)data,
	519	sizeof(struct pt_regs))) {
	520	ret = -EIO;
	521	break;
	522	}
	523	ret = 0;
	524	for (ui = 0; ui < PT_REGS_COUNT; ui ++) {
	525	ret = __get_user(tmp, (unsigned long __user *) data);
e8a30302 SR	526	if (ret)
e8a30302 SR	527	break;
865418d8	528	ptrace_put_reg(child, ui, tmp);
e17666ba	529	data += sizeof(long);
e8a30302 SR	530	}
	531	break;
	532	}
	533
e17666ba	534	case PTRACE_GETFPREGS: { /* Get the child FPU state (FPR0...31 + FPSCR) */
e8a30302	535	flush_fp_to_thread(child);
e17666ba	536	ret = get_fpregs((void __user *)data, child, 1);
e8a30302 SR	537	break;
	538	}
	539
e17666ba	540	case PTRACE_SETFPREGS: { /* Set the child FPU state (FPR0...31 + FPSCR) */
e8a30302	541	flush_fp_to_thread(child);
e17666ba	542	ret = set_fpregs((void __user *)data, child, 1);
e8a30302 SR	543	break;
e8a30302 SR	544	}
e8a30302	545
1da177e4 LT	546	#ifdef CONFIG_ALTIVEC
	547	case PTRACE_GETVRREGS:
	548	/* Get the child altivec register state. */
e8a30302	549	flush_altivec_to_thread(child);
1da177e4 LT	550	ret = get_vrregs((unsigned long __user *)data, child);
	551	break;
	552
	553	case PTRACE_SETVRREGS:
	554	/* Set the child altivec register state. */
e8a30302	555	flush_altivec_to_thread(child);
1da177e4 LT	556	ret = set_vrregs(child, (unsigned long __user *)data);
	557	break;
	558	#endif
	559	#ifdef CONFIG_SPE
	560	case PTRACE_GETEVRREGS:
	561	/* Get the child spe register state. */
	562	if (child->thread.regs->msr & MSR_SPE)
	563	giveup_spe(child);
	564	ret = get_evrregs((unsigned long __user *)data, child);
	565	break;
	566
	567	case PTRACE_SETEVRREGS:
	568	/* Set the child spe register state. */
	569	/* this is to clear the MSR_SPE bit to force a reload
	570	* of register state from memory */
	571	if (child->thread.regs->msr & MSR_SPE)
	572	giveup_spe(child);
	573	ret = set_evrregs(child, (unsigned long __user *)data);
	574	break;
	575	#endif
	576
e17666ba BH	577	/* Old reverse args ptrace callss */
	578	case PPC_PTRACE_GETREGS: /* Get GPRs 0 - 31. */
	579	case PPC_PTRACE_SETREGS: /* Set GPRs 0 - 31. */
	580	case PPC_PTRACE_GETFPREGS: /* Get FPRs 0 - 31. */
	581	case PPC_PTRACE_SETFPREGS: /* Get FPRs 0 - 31. */
	582	ret = arch_ptrace_old(child, request, addr, data);
	583	break;
	584
1da177e4 LT	585	default:
	586	ret = ptrace_request(child, request, addr, data);
	587	break;
	588	}
1da177e4 LT	589	return ret;
	590	}
	591
ea9c102c	592	static void do_syscall_trace(void)
1da177e4	593	{
ea9c102c DW	594	/* the 0x80 provides a way for the tracing parent to distinguish
ea9c102c DW	595	between a syscall stop and SIGTRAP delivery */
1da177e4 LT	596	ptrace_notify(SIGTRAP \| ((current->ptrace & PT_TRACESYSGOOD)
	597	? 0x80 : 0));
	598
	599	/*
	600	* this isn't the same as continuing with a signal, but it will do
	601	* for normal use. strace only continues with a signal if the
	602	* stopping signal is not SIGTRAP. -brl
	603	*/
	604	if (current->exit_code) {
	605	send_sig(current->exit_code, current, 1);
	606	current->exit_code = 0;
	607	}
	608	}
ea9c102c DW	609
	610	void do_syscall_trace_enter(struct pt_regs *regs)
	611	{
e8a30302	612	secure_computing(regs->gpr[0]);
e8a30302	613
ea9c102c DW	614	if (test_thread_flag(TIF_SYSCALL_TRACE)
	615	&& (current->ptrace & PT_PTRACED))
	616	do_syscall_trace();
	617
cfcd1705 DW	618	if (unlikely(current->audit_context)) {
	619	#ifdef CONFIG_PPC64
	620	if (!test_thread_flag(TIF_32BIT))
	621	audit_syscall_entry(AUDIT_ARCH_PPC64,
	622	regs->gpr[0],
	623	regs->gpr[3], regs->gpr[4],
	624	regs->gpr[5], regs->gpr[6]);
	625	else
e8a30302	626	#endif
cfcd1705 DW	627	audit_syscall_entry(AUDIT_ARCH_PPC,
	628	regs->gpr[0],
	629	regs->gpr[3] & 0xffffffff,
	630	regs->gpr[4] & 0xffffffff,
	631	regs->gpr[5] & 0xffffffff,
	632	regs->gpr[6] & 0xffffffff);
	633	}
ea9c102c DW	634	}
	635
	636	void do_syscall_trace_leave(struct pt_regs *regs)
	637	{
ea9c102c	638	if (unlikely(current->audit_context))
4b9c876a	639	audit_syscall_exit((regs->ccr&0x10000000)?AUDITSC_FAILURE:AUDITSC_SUCCESS,
ea9c102c DW	640	regs->result);
ea9c102c DW	641
e8a30302	642	if ((test_thread_flag(TIF_SYSCALL_TRACE)
1bd79336	643	\|\| test_thread_flag(TIF_SINGLESTEP))
ea9c102c DW	644	&& (current->ptrace & PT_PTRACED))
	645	do_syscall_trace();
	646	}