[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>

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

/*
 * 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

/*
 * Max register writeable via put_reg
 */
#ifdef CONFIG_PPC32
#define PT_MAX_PUT_REG	PT_MQ
#else
#define PT_MAX_PUT_REG	PT_CCR
#endif

/*
 * 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 tmp | task->thread.fpexc_mode;
	}

	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);
}

static int ptrace_set_debugreg(struct task_struct *task, unsigned long addr,
			       unsigned long data)
{
	/* We only support one DABR and no IABRS at the moment */
	if (addr > 0)
		return -EINVAL;

	/* The bottom 3 bits are flags */
	if ((data & ~0x7UL) >= TASK_SIZE)
		return -EIO;

	/* Ensure translation is on */
	if (data && !(data & DABR_TRANSLATION))
		return -EIO;

	task->thread.dabr = data;
	return 0;
}

/*
 * 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;
	}

	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;

	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
abd06505 BH	38	/*
	39	* does not yet catch signals sent when the child dies.
	40	* in exit.c or in signal.c.
	41	*/
	42
	43	/*
	44	* Set of msr bits that gdb can change on behalf of a process.
	45	*/
	46	#if defined(CONFIG_40x) \|\| defined(CONFIG_BOOKE)
	47	#define MSR_DEBUGCHANGE 0
1da177e4	48	#else
abd06505	49	#define MSR_DEBUGCHANGE (MSR_SE \| MSR_BE)
1da177e4	50	#endif
acd89828	51
1da177e4	52	/*
abd06505	53	* Max register writeable via put_reg
1da177e4	54	*/
abd06505 BH	55	#ifdef CONFIG_PPC32
	56	#define PT_MAX_PUT_REG PT_MQ
	57	#else
	58	#define PT_MAX_PUT_REG PT_CCR
	59	#endif
1da177e4	60
865418d8 BH	61	/*
	62	* Get contents of register REGNO in task TASK.
	63	*/
	64	unsigned long ptrace_get_reg(struct task_struct *task, int regno)
	65	{
	66	unsigned long tmp = 0;
	67
	68	if (task->thread.regs == NULL)
	69	return -EIO;
	70
	71	if (regno == PT_MSR) {
	72	tmp = ((unsigned long *)task->thread.regs)[PT_MSR];
abd06505	73	return tmp \| task->thread.fpexc_mode;
865418d8 BH	74	}
	75
	76	if (regno < (sizeof(struct pt_regs) / sizeof(unsigned long)))
	77	return ((unsigned long *)task->thread.regs)[regno];
	78
	79	return -EIO;
	80	}
	81
	82	/*
	83	* Write contents of register REGNO in task TASK.
	84	*/
	85	int ptrace_put_reg(struct task_struct *task, int regno, unsigned long data)
	86	{
	87	if (task->thread.regs == NULL)
	88	return -EIO;
	89
912000e7	90	if (regno <= PT_MAX_PUT_REG \|\| regno == PT_TRAP) {
865418d8 BH	91	if (regno == PT_MSR)
	92	data = (data & MSR_DEBUGCHANGE)
	93	\| (task->thread.regs->msr & ~MSR_DEBUGCHANGE);
912000e7 BH	94	/* We prevent mucking around with the reserved area of trap
	95	* which are used internally by the kernel
	96	*/
	97	if (regno == PT_TRAP)
	98	data &= 0xfff0;
865418d8 BH	99	((unsigned long *)task->thread.regs)[regno] = data;
	100	return 0;
	101	}
	102	return -EIO;
	103	}
	104
	105
	106	static int get_fpregs(void __user data, struct task_struct task,
	107	int has_fpscr)
	108	{
	109	unsigned int count = has_fpscr ? 33 : 32;
	110
	111	if (copy_to_user(data, task->thread.fpr, count * sizeof(double)))
	112	return -EFAULT;
	113	return 0;
	114	}
	115
	116	static int set_fpregs(void __user data, struct task_struct task,
	117	int has_fpscr)
	118	{
	119	unsigned int count = has_fpscr ? 33 : 32;
	120
	121	if (copy_from_user(task->thread.fpr, data, count * sizeof(double)))
	122	return -EFAULT;
	123	return 0;
	124	}
	125
	126
	127	#ifdef CONFIG_ALTIVEC
	128	/*
	129	* Get/set all the altivec registers vr0..vr31, vscr, vrsave, in one go.
	130	* The transfer totals 34 quadword. Quadwords 0-31 contain the
	131	* corresponding vector registers. Quadword 32 contains the vscr as the
	132	* last word (offset 12) within that quadword. Quadword 33 contains the
	133	* vrsave as the first word (offset 0) within the quadword.
	134	*
	135	* This definition of the VMX state is compatible with the current PPC32
	136	* ptrace interface. This allows signal handling and ptrace to use the
	137	* same structures. This also simplifies the implementation of a bi-arch
	138	* (combined (32- and 64-bit) gdb.
	139	*/
	140
	141	/*
	142	* Get contents of AltiVec register state in task TASK
	143	*/
	144	static int get_vrregs(unsigned long __user data, struct task_struct task)
	145	{
	146	unsigned long regsize;
	147
	148	/* copy AltiVec registers VR[0] .. VR[31] */
	149	regsize = 32 * sizeof(vector128);
	150	if (copy_to_user(data, task->thread.vr, regsize))
	151	return -EFAULT;
	152	data += (regsize / sizeof(unsigned long));
	153
	154	/* copy VSCR */
	155	regsize = 1 * sizeof(vector128);
	156	if (copy_to_user(data, &task->thread.vscr, regsize))
	157	return -EFAULT;
	158	data += (regsize / sizeof(unsigned long));
	159
	160	/* copy VRSAVE */
	161	if (put_user(task->thread.vrsave, (u32 __user *)data))
	162	return -EFAULT;
163
164	return 0;
165	}
166
167	/*
168	* Write contents of AltiVec register state into task TASK.
169	*/
170	static int set_vrregs(struct task_struct task, unsigned long __user data)
171	{
172	unsigned long regsize;
173
174	/* copy AltiVec registers VR[0] .. VR[31] */
175	regsize = 32 * sizeof(vector128);
176	if (copy_from_user(task->thread.vr, data, regsize))
177	return -EFAULT;
178	data += (regsize / sizeof(unsigned long));
179
180	/* copy VSCR */
181	regsize = 1 * sizeof(vector128);
182	if (copy_from_user(&task->thread.vscr, data, regsize))
183	return -EFAULT;
184	data += (regsize / sizeof(unsigned long));
185
186	/* copy VRSAVE */
187	if (get_user(task->thread.vrsave, (u32 __user *)data))
188	return -EFAULT;
189
190	return 0;
191	}
192	#endif /* CONFIG_ALTIVEC */
193
194	#ifdef CONFIG_SPE
195
196	/*
197	* For get_evrregs/set_evrregs functions 'data' has the following layout:
198	*
199	* struct {
200	* u32 evr[32];
201	* u64 acc;
202	* u32 spefscr;
203	* }
204	*/
205
206	/*
207	* Get contents of SPE register state in task TASK.
208	*/
209	static int get_evrregs(unsigned long data, struct task_struct task)
210	{
211	int i;
212
213	if (!access_ok(VERIFY_WRITE, data, 35 * sizeof(unsigned long)))
214	return -EFAULT;
215
216	/* copy SPEFSCR */
217	if (__put_user(task->thread.spefscr, &data[34]))
218	return -EFAULT;
219
220	/* copy SPE registers EVR[0] .. EVR[31] */
221	for (i = 0; i < 32; i++, data++)
222	if (__put_user(task->thread.evr[i], data))
223	return -EFAULT;
224
225	/* copy ACC */
226	if (__put_user64(task->thread.acc, (unsigned long long *)data))
227	return -EFAULT;
228
229	return 0;
230	}
231
232	/*
233	* Write contents of SPE register state into task TASK.
234	*/
235	static int set_evrregs(struct task_struct task, unsigned long data)
236	{
237	int i;
238
239	if (!access_ok(VERIFY_READ, data, 35 * sizeof(unsigned long)))
240	return -EFAULT;
241
242	/* copy SPEFSCR */
243	if (__get_user(task->thread.spefscr, &data[34]))
244	return -EFAULT;
245
246	/* copy SPE registers EVR[0] .. EVR[31] */
247	for (i = 0; i < 32; i++, data++)
248	if (__get_user(task->thread.evr[i], data))
249	return -EFAULT;
250	/* copy ACC */
251	if (__get_user64(task->thread.acc, (unsigned long long*)data))
252	return -EFAULT;
253
254	return 0;
255	}
256	#endif /* CONFIG_SPE */
257
258
259	static void set_single_step(struct task_struct *task)
260	{
261	struct pt_regs *regs = task->thread.regs;
262
263	if (regs != NULL) {
264	#if defined(CONFIG_40x) \|\| defined(CONFIG_BOOKE)
265	task->thread.dbcr0 = DBCR0_IDM \| DBCR0_IC;
266	regs->msr \|= MSR_DE;
267	#else
268	regs->msr \|= MSR_SE;
269	#endif
270	}
271	set_tsk_thread_flag(task, TIF_SINGLESTEP);
272	}
273
274	static void clear_single_step(struct task_struct *task)
275	{
276	struct pt_regs *regs = task->thread.regs;
277
278	if (regs != NULL) {
279	#if defined(CONFIG_40x) \|\| defined(CONFIG_BOOKE)
280	task->thread.dbcr0 = 0;
281	regs->msr &= ~MSR_DE;
282	#else
283	regs->msr &= ~MSR_SE;
284	#endif
285	}
286	clear_tsk_thread_flag(task, TIF_SINGLESTEP);
287	}
288
abd06505 BH	289	static int ptrace_set_debugreg(struct task_struct *task, unsigned long addr,
	290	unsigned long data)
	291	{
	292	/* We only support one DABR and no IABRS at the moment */
	293	if (addr > 0)
	294	return -EINVAL;
	295
	296	/* The bottom 3 bits are flags */
	297	if ((data & ~0x7UL) >= TASK_SIZE)
	298	return -EIO;
	299
	300	/* Ensure translation is on */
	301	if (data && !(data & DABR_TRANSLATION))
	302	return -EIO;
	303
	304	task->thread.dabr = data;
	305	return 0;
	306	}
abd06505	307
1da177e4 LT	308	/*
	309	* Called by kernel/ptrace.c when detaching..
	310	*
	311	* Make sure single step bits etc are not set.
	312	*/
	313	void ptrace_disable(struct task_struct *child)
	314	{
	315	/* make sure the single step bit is not set. */
	316	clear_single_step(child);
	317	}
	318
e17666ba BH	319	/*
	320	* Here are the old "legacy" powerpc specific getregs/setregs ptrace calls,
	321	* we mark them as obsolete now, they will be removed in a future version
	322	*/
	323	static long arch_ptrace_old(struct task_struct *child, long request, long addr,
	324	long data)
	325	{
	326	int ret = -EPERM;
	327
	328	switch(request) {
	329	case PPC_PTRACE_GETREGS: { /* Get GPRs 0 - 31. */
	330	int i;
	331	unsigned long reg = &((unsigned long )child->thread.regs)[0];
	332	unsigned long __user tmp = (unsigned long __user )addr;
	333
	334	for (i = 0; i < 32; i++) {
	335	ret = put_user(*reg, tmp);
	336	if (ret)
	337	break;
	338	reg++;
	339	tmp++;
	340	}
	341	break;
	342	}
	343
	344	case PPC_PTRACE_SETREGS: { /* Set GPRs 0 - 31. */
	345	int i;
	346	unsigned long reg = &((unsigned long )child->thread.regs)[0];
	347	unsigned long __user tmp = (unsigned long __user )addr;
	348
	349	for (i = 0; i < 32; i++) {
	350	ret = get_user(*reg, tmp);
	351	if (ret)
	352	break;
	353	reg++;
	354	tmp++;
	355	}
	356	break;
	357	}
	358
	359	case PPC_PTRACE_GETFPREGS: { /* Get FPRs 0 - 31. */
	360	flush_fp_to_thread(child);
	361	ret = get_fpregs((void __user *)addr, child, 0);
	362	break;
	363	}
	364
	365	case PPC_PTRACE_SETFPREGS: { /* Get FPRs 0 - 31. */
	366	flush_fp_to_thread(child);
	367	ret = set_fpregs((void __user *)addr, child, 0);
	368	break;
	369	}
	370
	371	}
	372	return ret;
	373	}
	374
481bed45	375	long arch_ptrace(struct task_struct *child, long request, long addr, long data)
1da177e4	376	{
1da177e4 LT	377	int ret = -EPERM;
1da177e4 LT	378
1da177e4 LT	379	switch (request) {
	380	/* when I and D space are separate, these will need to be fixed. */
	381	case PTRACE_PEEKTEXT: /* read word at location addr. */
	382	case PTRACE_PEEKDATA: {
	383	unsigned long tmp;
	384	int copied;
	385
	386	copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0);
	387	ret = -EIO;
	388	if (copied != sizeof(tmp))
	389	break;
	390	ret = put_user(tmp,(unsigned long __user *) data);
	391	break;
	392	}
	393
	394	/* read the word at location addr in the USER area. */
1da177e4 LT	395	case PTRACE_PEEKUSR: {
	396	unsigned long index, tmp;
	397
	398	ret = -EIO;
	399	/* convert to index and check */
e8a30302	400	#ifdef CONFIG_PPC32
1da177e4	401	index = (unsigned long) addr >> 2;
e8a30302 SR	402	if ((addr & 3) \|\| (index > PT_FPSCR)
	403	\|\| (child->thread.regs == NULL))
	404	#else
	405	index = (unsigned long) addr >> 3;
	406	if ((addr & 7) \|\| (index > PT_FPSCR))
	407	#endif
1da177e4 LT	408	break;
	409
	410	CHECK_FULL_REGS(child->thread.regs);
	411	if (index < PT_FPR0) {
865418d8	412	tmp = ptrace_get_reg(child, (int) index);
1da177e4	413	} else {
e8a30302	414	flush_fp_to_thread(child);
1da177e4 LT	415	tmp = ((unsigned long *)child->thread.fpr)[index - PT_FPR0];
	416	}
	417	ret = put_user(tmp,(unsigned long __user *) data);
	418	break;
	419	}
	420
	421	/* If I and D space are separate, this will have to be fixed. */
	422	case PTRACE_POKETEXT: /* write the word at location addr. */
	423	case PTRACE_POKEDATA:
	424	ret = 0;
e8a30302 SR	425	if (access_process_vm(child, addr, &data, sizeof(data), 1)
e8a30302 SR	426	== sizeof(data))
1da177e4 LT	427	break;
	428	ret = -EIO;
	429	break;
	430
	431	/* write the word at location addr in the USER area */
	432	case PTRACE_POKEUSR: {
	433	unsigned long index;
	434
	435	ret = -EIO;
	436	/* convert to index and check */
e8a30302	437	#ifdef CONFIG_PPC32
1da177e4	438	index = (unsigned long) addr >> 2;
e8a30302 SR	439	if ((addr & 3) \|\| (index > PT_FPSCR)
	440	\|\| (child->thread.regs == NULL))
	441	#else
	442	index = (unsigned long) addr >> 3;
	443	if ((addr & 7) \|\| (index > PT_FPSCR))
	444	#endif
1da177e4 LT	445	break;
	446
	447	CHECK_FULL_REGS(child->thread.regs);
1da177e4	448	if (index < PT_FPR0) {
865418d8	449	ret = ptrace_put_reg(child, index, data);
1da177e4	450	} else {
e8a30302	451	flush_fp_to_thread(child);
1da177e4 LT	452	((unsigned long *)child->thread.fpr)[index - PT_FPR0] = data;
	453	ret = 0;
	454	}
	455	break;
	456	}
	457
	458	case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
	459	case PTRACE_CONT: { /* restart after signal. */
	460	ret = -EIO;
7ed20e1a	461	if (!valid_signal(data))
1da177e4	462	break;
e8a30302	463	if (request == PTRACE_SYSCALL)
1da177e4	464	set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
e8a30302	465	else
1da177e4	466	clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
1da177e4 LT	467	child->exit_code = data;
	468	/* make sure the single step bit is not set. */
	469	clear_single_step(child);
	470	wake_up_process(child);
	471	ret = 0;
	472	break;
	473	}
	474
	475	/*
	476	* make the child exit. Best I can do is send it a sigkill.
	477	* perhaps it should be put in the status that it wants to
	478	* exit.
	479	*/
	480	case PTRACE_KILL: {
	481	ret = 0;
	482	if (child->exit_state == EXIT_ZOMBIE) /* already dead */
	483	break;
	484	child->exit_code = SIGKILL;
	485	/* make sure the single step bit is not set. */
	486	clear_single_step(child);
	487	wake_up_process(child);
	488	break;
	489	}
	490
	491	case PTRACE_SINGLESTEP: { /* set the trap flag. */
	492	ret = -EIO;
7ed20e1a	493	if (!valid_signal(data))
1da177e4 LT	494	break;
	495	clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
	496	set_single_step(child);
	497	child->exit_code = data;
	498	/* give it a chance to run. */
	499	wake_up_process(child);
	500	ret = 0;
	501	break;
	502	}
	503
e8a30302 SR	504	case PTRACE_GET_DEBUGREG: {
	505	ret = -EINVAL;
	506	/* We only support one DABR and no IABRS at the moment */
	507	if (addr > 0)
	508	break;
	509	ret = put_user(child->thread.dabr,
	510	(unsigned long __user *)data);
	511	break;
	512	}
	513
	514	case PTRACE_SET_DEBUGREG:
	515	ret = ptrace_set_debugreg(child, addr, data);
	516	break;
e8a30302	517
1da177e4 LT	518	case PTRACE_DETACH:
	519	ret = ptrace_detach(child, data);
	520	break;
	521
e17666ba BH	522	#ifdef CONFIG_PPC64
	523	case PTRACE_GETREGS64:
	524	#endif
	525	case PTRACE_GETREGS: { /* Get all pt_regs from the child. */
	526	int ui;
	527	if (!access_ok(VERIFY_WRITE, (void __user *)data,
	528	sizeof(struct pt_regs))) {
	529	ret = -EIO;
	530	break;
	531	}
	532	ret = 0;
	533	for (ui = 0; ui < PT_REGS_COUNT; ui ++) {
865418d8	534	ret \|= __put_user(ptrace_get_reg(child, ui),
e17666ba BH	535	(unsigned long __user *) data);
e17666ba BH	536	data += sizeof(long);
e8a30302 SR	537	}
	538	break;
	539	}
	540
e17666ba BH	541	#ifdef CONFIG_PPC64
	542	case PTRACE_SETREGS64:
	543	#endif
	544	case PTRACE_SETREGS: { /* Set all gp regs in the child. */
	545	unsigned long tmp;
	546	int ui;
	547	if (!access_ok(VERIFY_READ, (void __user *)data,
	548	sizeof(struct pt_regs))) {
	549	ret = -EIO;
	550	break;
	551	}
	552	ret = 0;
	553	for (ui = 0; ui < PT_REGS_COUNT; ui ++) {
	554	ret = __get_user(tmp, (unsigned long __user *) data);
e8a30302 SR	555	if (ret)
e8a30302 SR	556	break;
865418d8	557	ptrace_put_reg(child, ui, tmp);
e17666ba	558	data += sizeof(long);
e8a30302 SR	559	}
	560	break;
	561	}
	562
e17666ba	563	case PTRACE_GETFPREGS: { /* Get the child FPU state (FPR0...31 + FPSCR) */
e8a30302	564	flush_fp_to_thread(child);
e17666ba	565	ret = get_fpregs((void __user *)data, child, 1);
e8a30302 SR	566	break;
	567	}
	568
e17666ba	569	case PTRACE_SETFPREGS: { /* Set the child FPU state (FPR0...31 + FPSCR) */
e8a30302	570	flush_fp_to_thread(child);
e17666ba	571	ret = set_fpregs((void __user *)data, child, 1);
e8a30302 SR	572	break;
e8a30302 SR	573	}
e8a30302	574
1da177e4 LT	575	#ifdef CONFIG_ALTIVEC
	576	case PTRACE_GETVRREGS:
	577	/* Get the child altivec register state. */
e8a30302	578	flush_altivec_to_thread(child);
1da177e4 LT	579	ret = get_vrregs((unsigned long __user *)data, child);
	580	break;
	581
	582	case PTRACE_SETVRREGS:
	583	/* Set the child altivec register state. */
e8a30302	584	flush_altivec_to_thread(child);
1da177e4 LT	585	ret = set_vrregs(child, (unsigned long __user *)data);
	586	break;
	587	#endif
	588	#ifdef CONFIG_SPE
	589	case PTRACE_GETEVRREGS:
	590	/* Get the child spe register state. */
	591	if (child->thread.regs->msr & MSR_SPE)
	592	giveup_spe(child);
	593	ret = get_evrregs((unsigned long __user *)data, child);
	594	break;
	595
	596	case PTRACE_SETEVRREGS:
	597	/* Set the child spe register state. */
	598	/* this is to clear the MSR_SPE bit to force a reload
	599	* of register state from memory */
	600	if (child->thread.regs->msr & MSR_SPE)
	601	giveup_spe(child);
	602	ret = set_evrregs(child, (unsigned long __user *)data);
	603	break;
	604	#endif
	605
e17666ba BH	606	/* Old reverse args ptrace callss */
	607	case PPC_PTRACE_GETREGS: /* Get GPRs 0 - 31. */
	608	case PPC_PTRACE_SETREGS: /* Set GPRs 0 - 31. */
	609	case PPC_PTRACE_GETFPREGS: /* Get FPRs 0 - 31. */
	610	case PPC_PTRACE_SETFPREGS: /* Get FPRs 0 - 31. */
	611	ret = arch_ptrace_old(child, request, addr, data);
	612	break;
	613
1da177e4 LT	614	default:
	615	ret = ptrace_request(child, request, addr, data);
	616	break;
	617	}
1da177e4 LT	618	return ret;
	619	}
	620
ea9c102c	621	static void do_syscall_trace(void)
1da177e4	622	{
ea9c102c DW	623	/* the 0x80 provides a way for the tracing parent to distinguish
ea9c102c DW	624	between a syscall stop and SIGTRAP delivery */
1da177e4 LT	625	ptrace_notify(SIGTRAP \| ((current->ptrace & PT_TRACESYSGOOD)
	626	? 0x80 : 0));
	627
	628	/*
	629	* this isn't the same as continuing with a signal, but it will do
	630	* for normal use. strace only continues with a signal if the
	631	* stopping signal is not SIGTRAP. -brl
	632	*/
	633	if (current->exit_code) {
	634	send_sig(current->exit_code, current, 1);
	635	current->exit_code = 0;
	636	}
	637	}
ea9c102c DW	638
	639	void do_syscall_trace_enter(struct pt_regs *regs)
	640	{
e8a30302	641	secure_computing(regs->gpr[0]);
e8a30302	642
ea9c102c DW	643	if (test_thread_flag(TIF_SYSCALL_TRACE)
	644	&& (current->ptrace & PT_PTRACED))
	645	do_syscall_trace();
	646
cfcd1705 DW	647	if (unlikely(current->audit_context)) {
	648	#ifdef CONFIG_PPC64
	649	if (!test_thread_flag(TIF_32BIT))
	650	audit_syscall_entry(AUDIT_ARCH_PPC64,
	651	regs->gpr[0],
	652	regs->gpr[3], regs->gpr[4],
	653	regs->gpr[5], regs->gpr[6]);
	654	else
e8a30302	655	#endif
cfcd1705 DW	656	audit_syscall_entry(AUDIT_ARCH_PPC,
	657	regs->gpr[0],
	658	regs->gpr[3] & 0xffffffff,
	659	regs->gpr[4] & 0xffffffff,
	660	regs->gpr[5] & 0xffffffff,
	661	regs->gpr[6] & 0xffffffff);
	662	}
ea9c102c DW	663	}
	664
	665	void do_syscall_trace_leave(struct pt_regs *regs)
	666	{
ea9c102c	667	if (unlikely(current->audit_context))
4b9c876a	668	audit_syscall_exit((regs->ccr&0x10000000)?AUDITSC_FAILURE:AUDITSC_SUCCESS,
ea9c102c DW	669	regs->result);
ea9c102c DW	670
e8a30302	671	if ((test_thread_flag(TIF_SYSCALL_TRACE)
1bd79336	672	\|\| test_thread_flag(TIF_SINGLESTEP))
ea9c102c DW	673	&& (current->ptrace & PT_PTRACED))
	674	do_syscall_trace();
	675	}