/*
 *  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/regset.h>
#include <linux/tracehook.h>
#include <linux/elf.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

static unsigned long get_user_msr(struct task_struct *task)
{
        return task->thread.regs->msr | task->thread.fpexc_mode;
}

static int set_user_msr(struct task_struct *task, unsigned long msr)
{
        task->thread.regs->msr &= ~MSR_DEBUGCHANGE;
        task->thread.regs->msr |= msr & MSR_DEBUGCHANGE;
        return 0;
}

/*
 * We prevent mucking around with the reserved area of trap
 * which are used internally by the kernel.
 */
static int set_user_trap(struct task_struct *task, unsigned long trap)
{
        task->thread.regs->trap = trap & 0xfff0;
        return 0;
}

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

        if (regno == PT_MSR)
                return get_user_msr(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_MSR)
                return set_user_msr(task, data);
        if (regno == PT_TRAP)
                return set_user_trap(task, data);

        if (regno <= PT_MAX_PUT_REG) {
                ((unsigned long *)task->thread.regs)[regno] = data;
                return 0;
        }
        return -EIO;
}

static int gpr_get(struct task_struct *target, const struct user_regset *regset,
                   unsigned int pos, unsigned int count,
                   void *kbuf, void __user *ubuf)
{
        int ret;

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

        CHECK_FULL_REGS(target->thread.regs);

        ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
                                  target->thread.regs,
                                  0, offsetof(struct pt_regs, msr));
        if (!ret) {
                unsigned long msr = get_user_msr(target);
                ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &msr,
                                          offsetof(struct pt_regs, msr),
                                          offsetof(struct pt_regs, msr) +
                                          sizeof(msr));
        }

        BUILD_BUG_ON(offsetof(struct pt_regs, orig_gpr3) !=
                     offsetof(struct pt_regs, msr) + sizeof(long));

        if (!ret)
                ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
                                          &target->thread.regs->orig_gpr3,
                                          offsetof(struct pt_regs, orig_gpr3),
                                          sizeof(struct pt_regs));
        if (!ret)
                ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
                                               sizeof(struct pt_regs), -1);

        return ret;
}

static int gpr_set(struct task_struct *target, const struct user_regset *regset,
                   unsigned int pos, unsigned int count,
                   const void *kbuf, const void __user *ubuf)
{
        unsigned long reg;
        int ret;

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

        CHECK_FULL_REGS(target->thread.regs);

        ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
                                 target->thread.regs,
                                 0, PT_MSR * sizeof(reg));

        if (!ret && count > 0) {
                ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &reg,
                                         PT_MSR * sizeof(reg),
                                         (PT_MSR + 1) * sizeof(reg));
                if (!ret)
                        ret = set_user_msr(target, reg);
        }

        BUILD_BUG_ON(offsetof(struct pt_regs, orig_gpr3) !=
                     offsetof(struct pt_regs, msr) + sizeof(long));

        if (!ret)
                ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
                                         &target->thread.regs->orig_gpr3,
                                         PT_ORIG_R3 * sizeof(reg),
                                         (PT_MAX_PUT_REG + 1) * sizeof(reg));

        if (PT_MAX_PUT_REG + 1 < PT_TRAP && !ret)
                ret = user_regset_copyin_ignore(
                        &pos, &count, &kbuf, &ubuf,
                        (PT_MAX_PUT_REG + 1) * sizeof(reg),
                        PT_TRAP * sizeof(reg));

        if (!ret && count > 0) {
                ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &reg,
                                         PT_TRAP * sizeof(reg),
                                         (PT_TRAP + 1) * sizeof(reg));
                if (!ret)
                        ret = set_user_trap(target, reg);
        }

        if (!ret)
                ret = user_regset_copyin_ignore(
                        &pos, &count, &kbuf, &ubuf,
                        (PT_TRAP + 1) * sizeof(reg), -1);

        return ret;
}

static int fpr_get(struct task_struct *target, const struct user_regset *regset,
                   unsigned int pos, unsigned int count,
                   void *kbuf, void __user *ubuf)
{
#ifdef CONFIG_VSX
        double buf[33];
        int i;
#endif
        flush_fp_to_thread(target);

#ifdef CONFIG_VSX
        /* copy to local buffer then write that out */
        for (i = 0; i < 32 ; i++)
                buf[i] = target->thread.TS_FPR(i);
        memcpy(&buf[32], &target->thread.fpscr, sizeof(double));
        return user_regset_copyout(&pos, &count, &kbuf, &ubuf, buf, 0, -1);

#else
        BUILD_BUG_ON(offsetof(struct thread_struct, fpscr) !=
                     offsetof(struct thread_struct, TS_FPR(32)));

        return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
                                   &target->thread.fpr, 0, -1);
#endif
}

static int fpr_set(struct task_struct *target, const struct user_regset *regset,
                   unsigned int pos, unsigned int count,
                   const void *kbuf, const void __user *ubuf)
{
#ifdef CONFIG_VSX
        double buf[33];
        int i;
#endif
        flush_fp_to_thread(target);

#ifdef CONFIG_VSX
        /* copy to local buffer then write that out */
        i = user_regset_copyin(&pos, &count, &kbuf, &ubuf, buf, 0, -1);
        if (i)
                return i;
        for (i = 0; i < 32 ; i++)
                target->thread.TS_FPR(i) = buf[i];
        memcpy(&target->thread.fpscr, &buf[32], sizeof(double));
        return 0;
#else
        BUILD_BUG_ON(offsetof(struct thread_struct, fpscr) !=
                     offsetof(struct thread_struct, TS_FPR(32)));

        return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
                                  &target->thread.fpr, 0, -1);
#endif
}

#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.
 */

static int vr_active(struct task_struct *target,
                     const struct user_regset *regset)
{
        flush_altivec_to_thread(target);
        return target->thread.used_vr ? regset->n : 0;
}

static int vr_get(struct task_struct *target, const struct user_regset *regset,
                  unsigned int pos, unsigned int count,
                  void *kbuf, void __user *ubuf)
{
        int ret;

        flush_altivec_to_thread(target);

        BUILD_BUG_ON(offsetof(struct thread_struct, vscr) !=
                     offsetof(struct thread_struct, vr[32]));

        ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
                                  &target->thread.vr, 0,
                                  33 * sizeof(vector128));
        if (!ret) {
                /*
                 * Copy out only the low-order word of vrsave.
                 */
                union {
                        elf_vrreg_t reg;
                        u32 word;
                } vrsave;
                memset(&vrsave, 0, sizeof(vrsave));
                vrsave.word = target->thread.vrsave;
                ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &vrsave,
                                          33 * sizeof(vector128), -1);
        }

        return ret;
}

static int vr_set(struct task_struct *target, const struct user_regset *regset,
                  unsigned int pos, unsigned int count,
                  const void *kbuf, const void __user *ubuf)
{
        int ret;

        flush_altivec_to_thread(target);

        BUILD_BUG_ON(offsetof(struct thread_struct, vscr) !=
                     offsetof(struct thread_struct, vr[32]));

        ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
                                 &target->thread.vr, 0, 33 * sizeof(vector128));
        if (!ret && count > 0) {
                /*
                 * We use only the first word of vrsave.
                 */
                union {
                        elf_vrreg_t reg;
                        u32 word;
                } vrsave;
                memset(&vrsave, 0, sizeof(vrsave));
                vrsave.word = target->thread.vrsave;
                ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &vrsave,
                                         33 * sizeof(vector128), -1);
                if (!ret)
                        target->thread.vrsave = vrsave.word;
        }

        return ret;
}
#endif /* CONFIG_ALTIVEC */

#ifdef CONFIG_VSX
/*
 * Currently to set and and get all the vsx state, you need to call
 * the fp and VMX calls aswell.  This only get/sets the lower 32
 * 128bit VSX registers.
 */

static int vsr_active(struct task_struct *target,
                      const struct user_regset *regset)
{
        flush_vsx_to_thread(target);
        return target->thread.used_vsr ? regset->n : 0;
}

static int vsr_get(struct task_struct *target, const struct user_regset *regset,
                   unsigned int pos, unsigned int count,
                   void *kbuf, void __user *ubuf)
{
        double buf[32];
        int ret, i;

        flush_vsx_to_thread(target);

        for (i = 0; i < 32 ; i++)
                buf[i] = target->thread.fpr[i][TS_VSRLOWOFFSET];
        ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
                                  buf, 0, 32 * sizeof(double));

        return ret;
}

static int vsr_set(struct task_struct *target, const struct user_regset *regset,
                   unsigned int pos, unsigned int count,
                   const void *kbuf, const void __user *ubuf)
{
        double buf[32];
        int ret,i;

        flush_vsx_to_thread(target);

        ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
                                 buf, 0, 32 * sizeof(double));
        for (i = 0; i < 32 ; i++)
                target->thread.fpr[i][TS_VSRLOWOFFSET] = buf[i];


        return ret;
}
#endif /* CONFIG_VSX */

#ifdef CONFIG_SPE

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

static int evr_active(struct task_struct *target,
                      const struct user_regset *regset)
{
        flush_spe_to_thread(target);
        return target->thread.used_spe ? regset->n : 0;
}

static int evr_get(struct task_struct *target, const struct user_regset *regset,
                   unsigned int pos, unsigned int count,
                   void *kbuf, void __user *ubuf)
{
        int ret;

        flush_spe_to_thread(target);

        ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
                                  &target->thread.evr,
                                  0, sizeof(target->thread.evr));

        BUILD_BUG_ON(offsetof(struct thread_struct, acc) + sizeof(u64) !=
                     offsetof(struct thread_struct, spefscr));

        if (!ret)
                ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
                                          &target->thread.acc,
                                          sizeof(target->thread.evr), -1);

        return ret;
}

static int evr_set(struct task_struct *target, const struct user_regset *regset,
                   unsigned int pos, unsigned int count,
                   const void *kbuf, const void __user *ubuf)
{
        int ret;

        flush_spe_to_thread(target);

        ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
                                 &target->thread.evr,
                                 0, sizeof(target->thread.evr));

        BUILD_BUG_ON(offsetof(struct thread_struct, acc) + sizeof(u64) !=
                     offsetof(struct thread_struct, spefscr));

        if (!ret)
                ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
                                         &target->thread.acc,
                                         sizeof(target->thread.evr), -1);

        return ret;
}
#endif /* CONFIG_SPE */


/*
 * These are our native regset flavors.
 */
enum powerpc_regset {
        REGSET_GPR,
        REGSET_FPR,
#ifdef CONFIG_ALTIVEC
        REGSET_VMX,
#endif
#ifdef CONFIG_VSX
        REGSET_VSX,
#endif
#ifdef CONFIG_SPE
        REGSET_SPE,
#endif
};

static const struct user_regset native_regsets[] = {
        [REGSET_GPR] = {
                .core_note_type = NT_PRSTATUS, .n = ELF_NGREG,
                .size = sizeof(long), .align = sizeof(long),
                .get = gpr_get, .set = gpr_set
        },
        [REGSET_FPR] = {
                .core_note_type = NT_PRFPREG, .n = ELF_NFPREG,
                .size = sizeof(double), .align = sizeof(double),
                .get = fpr_get, .set = fpr_set
        },
#ifdef CONFIG_ALTIVEC
        [REGSET_VMX] = {
                .core_note_type = NT_PPC_VMX, .n = 34,
                .size = sizeof(vector128), .align = sizeof(vector128),
                .active = vr_active, .get = vr_get, .set = vr_set
        },
#endif
#ifdef CONFIG_VSX
        [REGSET_VSX] = {
                .core_note_type = NT_PPC_VSX, .n = 32,
                .size = sizeof(double), .align = sizeof(double),
                .active = vsr_active, .get = vsr_get, .set = vsr_set
        },
#endif
#ifdef CONFIG_SPE
        [REGSET_SPE] = {
                .n = 35,
                .size = sizeof(u32), .align = sizeof(u32),
                .active = evr_active, .get = evr_get, .set = evr_set
        },
#endif
};

static const struct user_regset_view user_ppc_native_view = {
        .name = UTS_MACHINE, .e_machine = ELF_ARCH, .ei_osabi = ELF_OSABI,
        .regsets = native_regsets, .n = ARRAY_SIZE(native_regsets)
};

#ifdef CONFIG_PPC64
#include <linux/compat.h>

static int gpr32_get(struct task_struct *target,
                     const struct user_regset *regset,
                     unsigned int pos, unsigned int count,
                     void *kbuf, void __user *ubuf)
{
        const unsigned long *regs = &target->thread.regs->gpr[0];
        compat_ulong_t *k = kbuf;
        compat_ulong_t __user *u = ubuf;
        compat_ulong_t reg;

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

        CHECK_FULL_REGS(target->thread.regs);

        pos /= sizeof(reg);
        count /= sizeof(reg);

        if (kbuf)
                for (; count > 0 && pos < PT_MSR; --count)
                        *k++ = regs[pos++];
        else
                for (; count > 0 && pos < PT_MSR; --count)
                        if (__put_user((compat_ulong_t) regs[pos++], u++))
                                return -EFAULT;

        if (count > 0 && pos == PT_MSR) {
                reg = get_user_msr(target);
                if (kbuf)
                        *k++ = reg;
                else if (__put_user(reg, u++))
                        return -EFAULT;
                ++pos;
                --count;
        }

        if (kbuf)
                for (; count > 0 && pos < PT_REGS_COUNT; --count)
                        *k++ = regs[pos++];
        else
                for (; count > 0 && pos < PT_REGS_COUNT; --count)
                        if (__put_user((compat_ulong_t) regs[pos++], u++))
                                return -EFAULT;

        kbuf = k;
        ubuf = u;
        pos *= sizeof(reg);
        count *= sizeof(reg);
        return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
                                        PT_REGS_COUNT * sizeof(reg), -1);
}

static int gpr32_set(struct task_struct *target,
                     const struct user_regset *regset,
                     unsigned int pos, unsigned int count,
                     const void *kbuf, const void __user *ubuf)
{
        unsigned long *regs = &target->thread.regs->gpr[0];
        const compat_ulong_t *k = kbuf;
        const compat_ulong_t __user *u = ubuf;
        compat_ulong_t reg;

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

        CHECK_FULL_REGS(target->thread.regs);

        pos /= sizeof(reg);
        count /= sizeof(reg);

        if (kbuf)
                for (; count > 0 && pos < PT_MSR; --count)
                        regs[pos++] = *k++;
        else
                for (; count > 0 && pos < PT_MSR; --count) {
                        if (__get_user(reg, u++))
                                return -EFAULT;
                        regs[pos++] = reg;
                }


        if (count > 0 && pos == PT_MSR) {
                if (kbuf)
                        reg = *k++;
                else if (__get_user(reg, u++))
                        return -EFAULT;
                set_user_msr(target, reg);
                ++pos;
                --count;
        }

        if (kbuf) {
                for (; count > 0 && pos <= PT_MAX_PUT_REG; --count)
                        regs[pos++] = *k++;
                for (; count > 0 && pos < PT_TRAP; --count, ++pos)
                        ++k;
        } else {
                for (; count > 0 && pos <= PT_MAX_PUT_REG; --count) {
                        if (__get_user(reg, u++))
                                return -EFAULT;
                        regs[pos++] = reg;
                }
                for (; count > 0 && pos < PT_TRAP; --count, ++pos)
                        if (__get_user(reg, u++))
                                return -EFAULT;
        }

        if (count > 0 && pos == PT_TRAP) {
                if (kbuf)
                        reg = *k++;
                else if (__get_user(reg, u++))
                        return -EFAULT;
                set_user_trap(target, reg);
                ++pos;
                --count;
        }

        kbuf = k;
        ubuf = u;
        pos *= sizeof(reg);
        count *= sizeof(reg);
        return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
                                         (PT_TRAP + 1) * sizeof(reg), -1);
}

/*
 * These are the regset flavors matching the CONFIG_PPC32 native set.
 */
static const struct user_regset compat_regsets[] = {
        [REGSET_GPR] = {
                .core_note_type = NT_PRSTATUS, .n = ELF_NGREG,
                .size = sizeof(compat_long_t), .align = sizeof(compat_long_t),
                .get = gpr32_get, .set = gpr32_set
        },
        [REGSET_FPR] = {
                .core_note_type = NT_PRFPREG, .n = ELF_NFPREG,
                .size = sizeof(double), .align = sizeof(double),
                .get = fpr_get, .set = fpr_set
        },
#ifdef CONFIG_ALTIVEC
        [REGSET_VMX] = {
                .core_note_type = NT_PPC_VMX, .n = 34,
                .size = sizeof(vector128), .align = sizeof(vector128),
                .active = vr_active, .get = vr_get, .set = vr_set
        },
#endif
#ifdef CONFIG_SPE
        [REGSET_SPE] = {
                .core_note_type = NT_PPC_SPE, .n = 35,
                .size = sizeof(u32), .align = sizeof(u32),
                .active = evr_active, .get = evr_get, .set = evr_set
        },
#endif
};

static const struct user_regset_view user_ppc_compat_view = {
        .name = "ppc", .e_machine = EM_PPC, .ei_osabi = ELF_OSABI,
        .regsets = compat_regsets, .n = ARRAY_SIZE(compat_regsets)
};
#endif  /* CONFIG_PPC64 */

const struct user_regset_view *task_user_regset_view(struct task_struct *task)
{
#ifdef CONFIG_PPC64
        if (test_tsk_thread_flag(task, TIF_32BIT))
                return &user_ppc_compat_view;
#endif
        return &user_ppc_native_view;
}


void user_enable_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_BT;
                task->thread.dbcr0 |= DBCR0_IDM | DBCR0_IC;
                regs->msr |= MSR_DE;
#else
                regs->msr &= ~MSR_BE;
                regs->msr |= MSR_SE;
#endif
        }
        set_tsk_thread_flag(task, TIF_SINGLESTEP);
}

void user_enable_block_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_IC;
                task->thread.dbcr0 = DBCR0_IDM | DBCR0_BT;
                regs->msr |= MSR_DE;
#else
                regs->msr &= ~MSR_SE;
                regs->msr |= MSR_BE;
#endif
        }
        set_tsk_thread_flag(task, TIF_SINGLESTEP);
}

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

        if (regs != NULL) {
#if defined(CONFIG_BOOKE)
                /* If DAC don't clear DBCRO_IDM or MSR_DE */
                if (task->thread.dabr)
                        task->thread.dbcr0 &= ~(DBCR0_IC | DBCR0_BT);
                else {
                        task->thread.dbcr0 &= ~(DBCR0_IC | DBCR0_BT | DBCR0_IDM);
                        regs->msr &= ~MSR_DE;
                }
#elif defined(CONFIG_40x)
                task->thread.dbcr0 &= ~(DBCR0_IC | DBCR0_BT | DBCR0_IDM);
                regs->msr &= ~MSR_DE;
#else
                regs->msr &= ~(MSR_SE | MSR_BE);
#endif
        }
        clear_tsk_thread_flag(task, TIF_SINGLESTEP);
}

int ptrace_set_debugreg(struct task_struct *task, unsigned long addr,
                               unsigned long data)
{
        /* For ppc64 we support one DABR and no IABR's at the moment (ppc64).
         *  For embedded processors we support one DAC and no IAC's at the
         *  moment.
         */
        if (addr > 0)
                return -EINVAL;

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

#ifndef CONFIG_BOOKE

        /* For processors using DABR (i.e. 970), the bottom 3 bits are flags.
         *  It was assumed, on previous implementations, that 3 bits were
         *  passed together with the data address, fitting the design of the
         *  DABR register, as follows:
         *
         *  bit 0: Read flag
         *  bit 1: Write flag
         *  bit 2: Breakpoint translation
         *
         *  Thus, we use them here as so.
         */

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

        /* Move contents to the DABR register */
        task->thread.dabr = data;

#endif
#if defined(CONFIG_BOOKE)

        /* As described above, it was assumed 3 bits were passed with the data
         *  address, but we will assume only the mode bits will be passed
         *  as to not cause alignment restrictions for DAC-based processors.
         */

        /* DAC's hold the whole address without any mode flags */
        task->thread.dabr = data & ~0x3UL;

        if (task->thread.dabr == 0) {
                task->thread.dbcr0 &= ~(DBSR_DAC1R | DBSR_DAC1W | DBCR0_IDM);
                task->thread.regs->msr &= ~MSR_DE;
                return 0;
        }

        /* Read or Write bits must be set */

        if (!(data & 0x3UL))
                return -EINVAL;

        /* Set the Internal Debugging flag (IDM bit 1) for the DBCR0
           register */
        task->thread.dbcr0 = DBCR0_IDM;

        /* Check for write and read flags and set DBCR0
           accordingly */
        if (data & 0x1UL)
                task->thread.dbcr0 |= DBSR_DAC1R;
        if (data & 0x2UL)
                task->thread.dbcr0 |= DBSR_DAC1W;

        task->thread.regs->msr |= MSR_DE;
#endif
        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. */
        user_disable_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)
{
        switch (request) {
        case PPC_PTRACE_GETREGS:        /* Get GPRs 0 - 31. */
                return copy_regset_to_user(child, &user_ppc_native_view,
                                           REGSET_GPR, 0, 32 * sizeof(long),
                                           (void __user *) data);

        case PPC_PTRACE_SETREGS:        /* Set GPRs 0 - 31. */
                return copy_regset_from_user(child, &user_ppc_native_view,
                                             REGSET_GPR, 0, 32 * sizeof(long),
                                             (const void __user *) data);

        case PPC_PTRACE_GETFPREGS:      /* Get FPRs 0 - 31. */
                return copy_regset_to_user(child, &user_ppc_native_view,
                                           REGSET_FPR, 0, 32 * sizeof(double),
                                           (void __user *) data);

        case PPC_PTRACE_SETFPREGS:      /* Set FPRs 0 - 31. */
                return copy_regset_from_user(child, &user_ppc_native_view,
                                             REGSET_FPR, 0, 32 * sizeof(double),
                                             (const void __user *) data);
        }

        return -EPERM;
}

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

        switch (request) {
        /* 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)
                                [TS_FPRWIDTH * (index - PT_FPR0)];
                }
                ret = put_user(tmp,(unsigned long __user *) data);
                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)
                                [TS_FPRWIDTH * (index - PT_FPR0)] = data;
                        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;

#ifdef CONFIG_PPC64
        case PTRACE_GETREGS64:
#endif
        case PTRACE_GETREGS:    /* Get all pt_regs from the child. */
                return copy_regset_to_user(child, &user_ppc_native_view,
                                           REGSET_GPR,
                                           0, sizeof(struct pt_regs),
                                           (void __user *) data);

#ifdef CONFIG_PPC64
        case PTRACE_SETREGS64:
#endif
        case PTRACE_SETREGS:    /* Set all gp regs in the child. */
                return copy_regset_from_user(child, &user_ppc_native_view,
                                             REGSET_GPR,
                                             0, sizeof(struct pt_regs),
                                             (const void __user *) data);

        case PTRACE_GETFPREGS: /* Get the child FPU state (FPR0...31 + FPSCR) */
                return copy_regset_to_user(child, &user_ppc_native_view,
                                           REGSET_FPR,
                                           0, sizeof(elf_fpregset_t),
                                           (void __user *) data);

        case PTRACE_SETFPREGS: /* Set the child FPU state (FPR0...31 + FPSCR) */
                return copy_regset_from_user(child, &user_ppc_native_view,
                                             REGSET_FPR,
                                             0, sizeof(elf_fpregset_t),
                                             (const void __user *) data);

#ifdef CONFIG_ALTIVEC
        case PTRACE_GETVRREGS:
                return copy_regset_to_user(child, &user_ppc_native_view,
                                           REGSET_VMX,
                                           0, (33 * sizeof(vector128) +
                                               sizeof(u32)),
                                           (void __user *) data);

        case PTRACE_SETVRREGS:
                return copy_regset_from_user(child, &user_ppc_native_view,
                                             REGSET_VMX,
                                             0, (33 * sizeof(vector128) +
                                                 sizeof(u32)),
                                             (const void __user *) data);
#endif
#ifdef CONFIG_VSX
        case PTRACE_GETVSRREGS:
                return copy_regset_to_user(child, &user_ppc_native_view,
                                           REGSET_VSX,
                                           0, 32 * sizeof(double),
                                           (void __user *) data);

        case PTRACE_SETVSRREGS:
                return copy_regset_from_user(child, &user_ppc_native_view,
                                             REGSET_VSX,
                                             0, 32 * sizeof(double),
                                             (const void __user *) data);
#endif
#ifdef CONFIG_SPE
        case PTRACE_GETEVRREGS:
                /* Get the child spe register state. */
                return copy_regset_to_user(child, &user_ppc_native_view,
                                           REGSET_SPE, 0, 35 * sizeof(u32),
                                           (void __user *) data);

        case PTRACE_SETEVRREGS:
                /* Set the child spe register state. */
                return copy_regset_from_user(child, &user_ppc_native_view,
                                             REGSET_SPE, 0, 35 * sizeof(u32),
                                             (const void __user *) data);
#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;
}

/*
 * We must return the syscall number to actually look up in the table.
 * This can be -1L to skip running any syscall at all.
 */
long do_syscall_trace_enter(struct pt_regs *regs)
{
        long ret = 0;

        secure_computing(regs->gpr[0]);

        if (test_thread_flag(TIF_SYSCALL_TRACE) &&
            tracehook_report_syscall_entry(regs))
                /*
                 * Tracing decided this syscall should not happen.
                 * We'll return a bogus call number to get an ENOSYS
                 * error, but leave the original number in regs->gpr[0].
                 */
                ret = -1L;

        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);
        }

        return ret ?: regs->gpr[0];
}

void do_syscall_trace_leave(struct pt_regs *regs)
{
        int step;

        if (unlikely(current->audit_context))
                audit_syscall_exit((regs->ccr&0x10000000)?AUDITSC_FAILURE:AUDITSC_SUCCESS,
                                   regs->result);

        step = test_thread_flag(TIF_SINGLESTEP);
        if (step || test_thread_flag(TIF_SYSCALL_TRACE))
                tracehook_report_syscall_exit(regs, step);
}