/*-
 * Copyright (c) 2014 Andrew Turner
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/elf.h>
#include <sys/exec.h>
#include <sys/imgact.h>
#include <sys/kernel.h>
#include <sys/limits.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/proc.h>
#include <sys/ptrace.h>
#include <sys/reg.h>
#include <sys/rwlock.h>
#include <sys/signalvar.h>
#include <sys/syscallsubr.h>
#include <sys/sysent.h>
#include <sys/sysproto.h>
#include <sys/ucontext.h>

#include <machine/armreg.h>
#include <machine/pcb.h>

/* Only used to get/set 32bits VFP regs */
int
cpu_ptrace(struct thread *td, int req, void *arg, int data)
{
#if defined(VFP) && defined(COMPAT_FREEBSD32)
        mcontext32_vfp_t vfp;
        int error;

        if (!SV_CURPROC_FLAG(SV_ILP32))
                return (EINVAL);
        switch (req) {
                case PT_GETVFPREGS32:
                        get_fpcontext32(td, &vfp);
                        error = copyout(&vfp, arg, sizeof(vfp));
                        break;
                case PT_SETVFPREGS32:
                        error = copyin(arg, &vfp, sizeof(vfp));
                        if (error == 0)
                                set_fpcontext32(td, &vfp);
                        break;
                default:
                        error = EINVAL;
        }

        return (error);
#else
        return (EINVAL);
#endif
}

#if defined(VFP) && defined(COMPAT_FREEBSD32)
static bool
get_arm_vfp(struct regset *rs, struct thread *td, void *buf, size_t *sizep)
{
        if (buf != NULL) {
                KASSERT(*sizep == sizeof(mcontext32_vfp_t),
                    ("%s: invalid size", __func__));
                get_fpcontext32(td, buf);
        }
        *sizep = sizeof(mcontext32_vfp_t);
        return (true);
}

static bool
set_arm_vfp(struct regset *rs, struct thread *td, void *buf,
    size_t size)
{
        KASSERT(size == sizeof(mcontext32_vfp_t), ("%s: invalid size",
            __func__));
        set_fpcontext32(td, buf);
        return (true);
}

static struct regset regset_arm_vfp = {
        .note = NT_ARM_VFP,
        .size = sizeof(mcontext32_vfp_t),
        .get = get_arm_vfp,
        .set = set_arm_vfp,
};
ELF32_REGSET(regset_arm_vfp);
#endif

static bool
get_arm64_tls(struct regset *rs, struct thread *td, void *buf,
    size_t *sizep)
{
        if (buf != NULL) {
                KASSERT(*sizep == sizeof(td->td_pcb->pcb_tpidr_el0),
                    ("%s: invalid size", __func__));
                memcpy(buf, &td->td_pcb->pcb_tpidr_el0,
                    sizeof(td->td_pcb->pcb_tpidr_el0));
        }
        *sizep = sizeof(td->td_pcb->pcb_tpidr_el0);

        return (true);
}

static struct regset regset_arm64_tls = {
        .note = NT_ARM_TLS,
        .size = sizeof(uint64_t),
        .get = get_arm64_tls,
};
ELF_REGSET(regset_arm64_tls);

#ifdef COMPAT_FREEBSD32
static bool
get_arm_tls(struct regset *rs, struct thread *td, void *buf,
    size_t *sizep)
{
        if (buf != NULL) {
                uint32_t tp;

                KASSERT(*sizep == sizeof(uint32_t),
                    ("%s: invalid size", __func__));
                tp = (uint32_t)td->td_pcb->pcb_tpidr_el0;
                memcpy(buf, &tp, sizeof(tp));
        }
        *sizep = sizeof(uint32_t);

        return (true);
}

static struct regset regset_arm_tls = {
        .note = NT_ARM_TLS,
        .size = sizeof(uint32_t),
        .get = get_arm_tls,
};
ELF32_REGSET(regset_arm_tls);
#endif

int
ptrace_set_pc(struct thread *td, u_long addr)
{

        td->td_frame->tf_elr = addr;
        return (0);
}

int
ptrace_single_step(struct thread *td)
{
        PROC_LOCK_ASSERT(td->td_proc, MA_OWNED);
        if ((td->td_frame->tf_spsr & PSR_SS) == 0) {
                td->td_frame->tf_spsr |= PSR_SS;
                td->td_pcb->pcb_flags |= PCB_SINGLE_STEP;
                td->td_dbgflags |= TDB_STEP;
        }
        return (0);
}

int
ptrace_clear_single_step(struct thread *td)
{
        PROC_LOCK_ASSERT(td->td_proc, MA_OWNED);
        td->td_frame->tf_spsr &= ~PSR_SS;
        td->td_pcb->pcb_flags &= ~PCB_SINGLE_STEP;
        td->td_dbgflags &= ~TDB_STEP;
        return (0);
}