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/*
 * This is a simple SMC (self-modifying-code) test.  This application uses
 * SMC to call Sub1() and then Sub2().
 */

#include <stdio.h>

typedef unsigned long UINT64;

extern void Call();
extern void FlushICache(void *);

static void Sub1();
static void Sub2();
static UINT64 GetImm();
static void PutImm(UINT64);
static UINT64 *GetMovlPtr();
static UINT64 GetFuncAddr(void (*)());


int main()
{
    PutImm(GetFuncAddr(&Sub1));
    Call();

    PutImm(GetFuncAddr(&Sub2));
    Call();

    return 0;
}


static void Sub1()
{
    printf("In Sub1\n");
}

static void Sub2()
{
    printf("In Sub2\n");
}

static UINT64 GetImm()
{
    UINT64 lo;
    UINT64 hi;
    UINT64 i;
    UINT64 imm9d;
    UINT64 imm5c;
    UINT64 ic;
    UINT64 imm7b;
    UINT64 imm41;
    UINT64 val;
    UINT64 *callmovl;

    callmovl = GetMovlPtr();
    lo = callmovl[0];
    hi = callmovl[1];

    i = (hi >> 59) & 1;
    imm41 = ((hi & 0x7fffff) << 18) | ((lo >> 46) & 0x3ffff);
    ic = (hi >> 44) & 1;
    imm5c = (hi >> 45) & 0x1f;
    imm9d = (hi >> 50) & 0x1ff;
    imm7b = (hi >> 36) & 0x7f;

    val = (i << 63) | (imm41 << 22) | (ic << 21) | (imm5c << 16) | (imm9d << 7) | imm7b;
    return val;
}

static void PutImm(UINT64 val)
{
    UINT64 lo;
    UINT64 hi;
    UINT64 i;
    UINT64 imm9d;
    UINT64 imm5c;
    UINT64 ic;
    UINT64 imm7b;
    UINT64 imm41;
    UINT64 *callmovl;

    i = (val >> 63) & 1;
    imm41 = (val >> 22) & 0x1ffffffffff;
    ic = (val >> 21) & 1;
    imm5c = (val >> 16) & 0x1f;
    imm9d = (val >> 7) & 0x1ff;
    imm7b = val & 0x7f;

    callmovl = GetMovlPtr();
    lo = callmovl[0];
    hi = callmovl[1];

    hi = (hi & ~(1ul<<59)) | (i << 59);
    hi = (hi & ~(0x1fful<<50)) | (imm9d << 50);
    hi = (hi & ~(0x1ful<<45)) | (imm5c << 45);
    hi = (hi & ~(1ul<<44)) | (ic << 44);
    hi = (hi & ~(0x7ful<<36)) | (imm7b << 36);
    hi = (hi & ~0x7ffffful) | (imm41 >> 18);
    lo = (lo & ~(0x3fffful<<46)) | ((imm41 & 0x3fffful) << 46);

    callmovl[0] = lo;
    callmovl[1] = hi;

    FlushICache(callmovl);
}

static UINT64 *GetMovlPtr()
{
    UINT64 val;

    val = GetFuncAddr(&Call);
    return (UINT64*)(val+16);
}

static UINT64 GetFuncAddr(void (*pf)())
{
    UINT64 *ptr;
    UINT64 val;

    ptr = (UINT64*)pf;
    val = *ptr;
    return val;
}