/*

 * Copyright 1997-2008 Sun Microsystems, Inc.  All Rights Reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 *

 */

// We have interface for the following instructions:

// - NativeInstruction

// - - NativeCall

// - - NativeFarCall

// - - NativeMovConstReg

// - - NativeMovConstRegPatching

// - - NativeMovRegMem

// - - NativeMovRegMemPatching

// - - NativeJump

// - - NativeGeneralJump

// - - NativeIllegalInstruction

// The base class for different kinds of native instruction abstractions.

// Provides the primitive operations to manipulate code relative to this.

class NativeInstruction VALUE_OBJ_CLASS_SPEC {

  friend class Relocation;

 public:

  enum Sparc_specific_constants {

    nop_instruction_size        =    4

  };

  bool is_dtrace_trap();

  bool is_nop()                        { return long_at(0) == nop_instruction(); }

  bool is_call()                       { return is_op(long_at(0), Assembler::call_op); }

  bool is_sethi()                      { return (is_op2(long_at(0), Assembler::sethi_op2)

                                          && inv_rd(long_at(0)) != G0); }

  bool sets_cc() {

    // conservative (returns true for some instructions that do not set the

    // the condition code, such as, "save".

    // Does not return true for the deprecated tagged instructions, such as, TADDcc

    int x = long_at(0);

    return (is_op(x, Assembler::arith_op) &&

            (inv_op3(x) & Assembler::cc_bit_op3) == Assembler::cc_bit_op3);

  }

  bool is_illegal();

  bool is_zombie() {

    int x = long_at(0);

    return is_op3(x,

                  VM_Version::v9_instructions_work() ?

                    Assembler::ldsw_op3 : Assembler::lduw_op3,

                  Assembler::ldst_op)

        && Assembler::inv_rs1(x) == G0

        && Assembler::inv_rd(x) == O7;

  }

  bool is_ic_miss_trap();       // Inline-cache uses a trap to detect a miss

  bool is_return() {

    // is it the output of MacroAssembler::ret or MacroAssembler::retl?

    int x = long_at(0);

    const int pc_return_offset = 8; // see frame_sparc.hpp

    return is_op3(x, Assembler::jmpl_op3, Assembler::arith_op)

        && (inv_rs1(x) == I7 || inv_rs1(x) == O7)

        && inv_immed(x) && inv_simm(x, 13) == pc_return_offset

        && inv_rd(x) == G0;

  }

  bool is_int_jump() {

    // is it the output of MacroAssembler::b?

    int x = long_at(0);

    return is_op2(x, Assembler::bp_op2) || is_op2(x, Assembler::br_op2);

  }

  bool is_float_jump() {

    // is it the output of MacroAssembler::fb?

    int x = long_at(0);

    return is_op2(x, Assembler::fbp_op2) || is_op2(x, Assembler::fb_op2);

  }

  bool is_jump() {

    return is_int_jump() || is_float_jump();

  }

  bool is_cond_jump() {

    int x = long_at(0);

    return (is_int_jump() && Assembler::inv_cond(x) != Assembler::always) ||

           (is_float_jump() && Assembler::inv_cond(x) != Assembler::f_always);

  }

  bool is_stack_bang() {

    int x = long_at(0);

    return is_op3(x, Assembler::stw_op3, Assembler::ldst_op) &&

      (inv_rd(x) == G0) && (inv_rs1(x) == SP) && (inv_rs2(x) == G3_scratch);

  }

  bool is_prefetch() {

    int x = long_at(0);

    return is_op3(x, Assembler::prefetch_op3, Assembler::ldst_op);

  }

  bool is_membar() {

    int x = long_at(0);

    return is_op3(x, Assembler::membar_op3, Assembler::arith_op) &&

      (inv_rd(x) == G0) && (inv_rs1(x) == O7);

  }

  bool is_safepoint_poll() {

    int x = long_at(0);

#ifdef _LP64

    return is_op3(x, Assembler::ldx_op3,  Assembler::ldst_op) &&

#else

    return is_op3(x, Assembler::lduw_op3, Assembler::ldst_op) &&

#endif

      (inv_rd(x) == G0) && (inv_immed(x) ? Assembler::inv_simm13(x) == 0 : inv_rs2(x) == G0);

  }

  bool is_zero_test(Register &reg);

  bool is_load_store_with_small_offset(Register reg);

 public:

#ifdef ASSERT

  static int rdpc_instruction()        { return Assembler::op(Assembler::arith_op ) | Assembler::op3(Assembler::rdreg_op3) | Assembler::u_field(5, 18, 14) | Assembler::rd(O7); }

#else

  // Temporary fix: in optimized mode, u_field is a macro for efficiency reasons (see Assembler::u_field) - needs to be fixed

  static int rdpc_instruction()        { return Assembler::op(Assembler::arith_op ) | Assembler::op3(Assembler::rdreg_op3) |            u_field(5, 18, 14) | Assembler::rd(O7); }

#endif

  static int nop_instruction()         { return Assembler::op(Assembler::branch_op) | Assembler::op2(Assembler::sethi_op2); }

  static int illegal_instruction();    // the output of __ breakpoint_trap()

  static int call_instruction(address destination, address pc) { return Assembler::op(Assembler::call_op) | Assembler::wdisp((intptr_t)destination, (intptr_t)pc, 30); }

  static int branch_instruction(Assembler::op2s op2val, Assembler::Condition c, bool a) {

    return Assembler::op(Assembler::branch_op) | Assembler::op2(op2val) | Assembler::annul(a) | Assembler::cond(c);

  }

  static int op3_instruction(Assembler::ops opval, Register rd, Assembler::op3s op3val, Register rs1, int simm13a) {

    return Assembler::op(opval) | Assembler::rd(rd) | Assembler::op3(op3val) | Assembler::rs1(rs1) | Assembler::immed(true) | Assembler::simm(simm13a, 13);

  }

  static int sethi_instruction(Register rd, int imm22a) {

    return Assembler::op(Assembler::branch_op) | Assembler::rd(rd) | Assembler::op2(Assembler::sethi_op2) | Assembler::hi22(imm22a);

  }

 protected:

  address  addr_at(int offset) const    { return address(this) + offset; }

  int      long_at(int offset) const    { return *(int*)addr_at(offset); }

  void set_long_at(int offset, int i);      /* deals with I-cache */

  void set_jlong_at(int offset, jlong i);   /* deals with I-cache */

  void set_addr_at(int offset, address x);  /* deals with I-cache */

  address instruction_address() const       { return addr_at(0); }

  address next_instruction_address() const  { return addr_at(BytesPerInstWord); }

  static bool is_op( int x, Assembler::ops opval)  {

    return Assembler::inv_op(x) == opval;

  }

  static bool is_op2(int x, Assembler::op2s op2val) {

    return Assembler::inv_op(x) == Assembler::branch_op && Assembler::inv_op2(x) == op2val;

  }

  static bool is_op3(int x, Assembler::op3s op3val, Assembler::ops opval) {

    return Assembler::inv_op(x) == opval && Assembler::inv_op3(x) == op3val;

  }

  // utilities to help subclasses decode:

  static Register inv_rd(  int x ) { return Assembler::inv_rd( x); }

  static Register inv_rs1( int x ) { return Assembler::inv_rs1(x); }

  static Register inv_rs2( int x ) { return Assembler::inv_rs2(x); }

  static bool inv_immed( int x ) { return Assembler::inv_immed(x); }

  static bool inv_annul( int x ) { return (Assembler::annul(true) & x) != 0; }

  static int  inv_cond(  int x ) { return Assembler::inv_cond(x); }

  static int inv_op(  int x ) { return Assembler::inv_op( x); }

  static int inv_op2( int x ) { return Assembler::inv_op2(x); }

  static int inv_op3( int x ) { return Assembler::inv_op3(x); }

  static int inv_simm(    int x, int nbits ) { return Assembler::inv_simm(x, nbits); }

  static intptr_t inv_wdisp(   int x, int nbits ) { return Assembler::inv_wdisp(  x, 0, nbits); }

  static intptr_t inv_wdisp16( int x )            { return Assembler::inv_wdisp16(x, 0); }

  static int branch_destination_offset(int x) { return Assembler::branch_destination(x, 0); }

  static int patch_branch_destination_offset(int dest_offset, int x) {

    return Assembler::patched_branch(dest_offset, x, 0);

  }

  void set_annul_bit() { set_long_at(0, long_at(0) | Assembler::annul(true)); }

  // utility for checking if x is either of 2 small constants

  static bool is_either(int x, int k1, int k2) {

    // return x == k1 || x == k2;

    return (1 << x) & (1 << k1 | 1 << k2);

  }

  // utility for checking overflow of signed instruction fields

  static bool fits_in_simm(int x, int nbits) {

    // cf. Assembler::assert_signed_range()

    // return -(1 << nbits-1) <= x  &&  x < ( 1 << nbits-1),

    return (unsigned)(x + (1 << nbits-1)) < (unsigned)(1 << nbits);

  }

  // set a signed immediate field

  static int set_simm(int insn, int imm, int nbits) {

    return (insn &~ Assembler::simm(-1, nbits)) | Assembler::simm(imm, nbits);

  }

  // set a wdisp field (disp should be the difference of two addresses)

  static int set_wdisp(int insn, intptr_t disp, int nbits) {

    return (insn &~ Assembler::wdisp((intptr_t)-4, (intptr_t)0, nbits)) | Assembler::wdisp(disp, 0, nbits);

  }

  static int set_wdisp16(int insn, intptr_t disp) {

    return (insn &~ Assembler::wdisp16((intptr_t)-4, 0)) | Assembler::wdisp16(disp, 0);

  }

  // get a simm13 field from an arithmetic or memory instruction

  static int get_simm13(int insn) {

    assert(is_either(Assembler::inv_op(insn),

                     Assembler::arith_op, Assembler::ldst_op) &&

            (insn & Assembler::immed(true)), "must have a simm13 field");

    return Assembler::inv_simm(insn, 13);

  }

  // set the simm13 field of an arithmetic or memory instruction

  static bool set_simm13(int insn, int imm) {

    get_simm13(insn);           // tickle the assertion check

    return set_simm(insn, imm, 13);

  }

  // combine the fields of a sethi stream (7 instructions ) and an add, jmp or ld/st

  static intptr_t data64( address pc, int arith_insn ) {

    assert(is_op2(*(unsigned int *)pc, Assembler::sethi_op2), "must be sethi");

    intptr_t hi = (intptr_t)gethi( (unsigned int *)pc );

    intptr_t lo = (intptr_t)get_simm13(arith_insn);

    assert((unsigned)lo < (1 << 10), "offset field of set_oop must be 10 bits");

    return hi | lo;

  }

  // Regenerate the instruction sequence that performs the 64 bit

  // sethi.  This only does the sethi.  The disp field (bottom 10 bits)

  // must be handled seperately.

  static void set_data64_sethi(address instaddr, intptr_t x);

  // combine the fields of a sethi/simm13 pair (simm13 = or, add, jmpl, ld/st)

  static int data32(int sethi_insn, int arith_insn) {

    assert(is_op2(sethi_insn, Assembler::sethi_op2), "must be sethi");

    int hi = Assembler::inv_hi22(sethi_insn);

    int lo = get_simm13(arith_insn);

    assert((unsigned)lo < (1 << 10), "offset field of set_oop must be 10 bits");

    return hi | lo;

  }

  static int set_data32_sethi(int sethi_insn, int imm) {

    // note that Assembler::hi22 clips the low 10 bits for us

    assert(is_op2(sethi_insn, Assembler::sethi_op2), "must be sethi");

    return (sethi_insn &~ Assembler::hi22(-1)) | Assembler::hi22(imm);

  }

  static int set_data32_simm13(int arith_insn, int imm) {

    get_simm13(arith_insn);             // tickle the assertion check

    int imm10 = Assembler::low10(imm);

    return (arith_insn &~ Assembler::simm(-1, 13)) | Assembler::simm(imm10, 13);

  }

  static int low10(int imm) {

    return Assembler::low10(imm);

  }

  // Perform the inverse of the LP64 Macroassembler::sethi

  // routine.  Extracts the 54 bits of address from the instruction

  // stream. This routine must agree with the sethi routine in

  // assembler_inline_sparc.hpp

  static address gethi( unsigned int *pc ) {

    int i = 0;

    uintptr_t adr;

    // We first start out with the real sethi instruction

    assert(is_op2(*pc, Assembler::sethi_op2), "in gethi - must be sethi");

    adr = (unsigned int)Assembler::inv_hi22( *(pc++) );

    i++;

    while ( i < 7 ) {

       // We're done if we hit a nop

       if ( (int)*pc == nop_instruction() ) break;

       assert ( Assembler::inv_op(*pc) == Assembler::arith_op, "in gethi - must be arith_op" );

       switch  ( Assembler::inv_op3(*pc) ) {

         case Assembler::xor_op3:

           adr ^= (intptr_t)get_simm13( *pc );

           return ( (address)adr );

           break;

         case Assembler::sll_op3:

           adr <<= ( *pc & 0x3f );

           break;

         case Assembler::or_op3:

           adr |= (intptr_t)get_simm13( *pc );

           break;

         default:

           assert ( 0, "in gethi - Should not reach here" );

           break;

       }

       pc++;

       i++;

    }

    return ( (address)adr );

  }

 public:

  void  verify();

  void  print();

  // unit test stuff

  static void test() {}                 // override for testing

  inline friend NativeInstruction* nativeInstruction_at(address address);

};

inline NativeInstruction* nativeInstruction_at(address address) {

    NativeInstruction* inst = (NativeInstruction*)address;

#ifdef ASSERT

      inst->verify();

#endif

    return inst;

}

//-----------------------------------------------------------------------------

// The NativeCall is an abstraction for accessing/manipulating native call imm32 instructions.

// (used to manipulate inline caches, primitive & dll calls, etc.)

inline NativeCall* nativeCall_at(address instr);

inline NativeCall* nativeCall_overwriting_at(address instr,

                                             address destination);

inline NativeCall* nativeCall_before(address return_address);

class NativeCall: public NativeInstruction {

 public:

  enum Sparc_specific_constants {

    instruction_size                   = 8,

    return_address_offset              = 8,

    call_displacement_width            = 30,

    displacement_offset                = 0,

    instruction_offset                 = 0

  };

  address instruction_address() const       { return addr_at(0); }

  address next_instruction_address() const  { return addr_at(instruction_size); }

  address return_address() const            { return addr_at(return_address_offset); }

  address destination() const               { return inv_wdisp(long_at(0), call_displacement_width) + instruction_address(); }

  address displacement_address() const      { return addr_at(displacement_offset); }

  void  set_destination(address dest)       { set_long_at(0, set_wdisp(long_at(0), dest - instruction_address(), call_displacement_width)); }

  void  set_destination_mt_safe(address dest);

  void  verify_alignment() {} // do nothing on sparc

  void  verify();

  void  print();

  // unit test stuff

  static void  test();

  // Creation

  friend inline NativeCall* nativeCall_at(address instr);

  friend NativeCall* nativeCall_overwriting_at(address instr, address destination = NULL) {

    // insert a "blank" call:

    NativeCall* call = (NativeCall*)instr;

    call->set_long_at(0 * BytesPerInstWord, call_instruction(destination, instr));

    call->set_long_at(1 * BytesPerInstWord, nop_instruction());

    assert(call->addr_at(2 * BytesPerInstWord) - instr == instruction_size, "instruction size");

    // check its structure now:

    assert(nativeCall_at(instr)->destination() == destination, "correct call destination");

    return call;

  }

  friend inline NativeCall* nativeCall_before(address return_address) {

    NativeCall* call = (NativeCall*)(return_address - return_address_offset);

    #ifdef ASSERT

      call->verify();

    #endif

    return call;

  }

  static bool is_call_at(address instr) {

    return nativeInstruction_at(instr)->is_call();

  }

  static bool is_call_before(address instr) {

    return nativeInstruction_at(instr - return_address_offset)->is_call();

  }

  static bool is_call_to(address instr, address target) {

    return nativeInstruction_at(instr)->is_call() &&

      nativeCall_at(instr)->destination() == target;

  }

  // MT-safe patching of a call instruction.

  static void insert(address code_pos, address entry) {

    (void)nativeCall_overwriting_at(code_pos, entry);

  }

  static void replace_mt_safe(address instr_addr, address code_buffer);

};

inline NativeCall* nativeCall_at(address instr) {

  NativeCall* call = (NativeCall*)instr;

#ifdef ASSERT

  call->verify();

#endif

  return call;

}

// The NativeFarCall is an abstraction for accessing/manipulating native call-anywhere

// instructions in the sparcv9 vm.  Used to call native methods which may be loaded

// anywhere in the address space, possibly out of reach of a call instruction.

#ifndef _LP64

// On 32-bit systems, a far call is the same as a near one.

class NativeFarCall;

inline NativeFarCall* nativeFarCall_at(address instr);

class NativeFarCall : public NativeCall {

public:

  friend inline NativeFarCall* nativeFarCall_at(address instr) { return (NativeFarCall*)nativeCall_at(instr); }

  friend NativeFarCall* nativeFarCall_overwriting_at(address instr, address destination = NULL)

                                                        { return (NativeFarCall*)nativeCall_overwriting_at(instr, destination); }

  friend NativeFarCall* nativeFarCall_before(address return_address)

                                                        { return (NativeFarCall*)nativeCall_before(return_address); }

};

#else

// The format of this extended-range call is:

//      jumpl_to addr, lreg

//      == sethi %hi54(addr), O7 ;  jumpl O7, %lo10(addr), O7 ;  <delay>

// That is, it is essentially the same as a NativeJump.

class NativeFarCall;

inline NativeFarCall* nativeFarCall_overwriting_at(address instr, address destination);

inline NativeFarCall* nativeFarCall_at(address instr);

class NativeFarCall: public NativeInstruction {

 public:

  enum Sparc_specific_constants {

    // instruction_size includes the delay slot instruction.

    instruction_size                   = 9 * BytesPerInstWord,

    return_address_offset              = 9 * BytesPerInstWord,

    jmpl_offset                        = 7 * BytesPerInstWord,

    displacement_offset                = 0,

    instruction_offset                 = 0

  };

  address instruction_address() const       { return addr_at(0); }

  address next_instruction_address() const  { return addr_at(instruction_size); }

  address return_address() const            { return addr_at(return_address_offset); }

  address destination() const {

    return (address) data64(addr_at(0), long_at(jmpl_offset));

  }

  address displacement_address() const      { return addr_at(displacement_offset); }

  void set_destination(address dest);

  bool destination_is_compiled_verified_entry_point();

  void  verify();

  void  print();

  // unit test stuff

  static void  test();

  // Creation

  friend inline NativeFarCall* nativeFarCall_at(address instr) {

    NativeFarCall* call = (NativeFarCall*)instr;

    #ifdef ASSERT

      call->verify();

    #endif

    return call;

  }

  friend inline NativeFarCall* nativeFarCall_overwriting_at(address instr, address destination = NULL) {

    Unimplemented();

    NativeFarCall* call = (NativeFarCall*)instr;

    return call;

  }

  friend NativeFarCall* nativeFarCall_before(address return_address) {

    NativeFarCall* call = (NativeFarCall*)(return_address - return_address_offset);

    #ifdef ASSERT

      call->verify();

    #endif

    return call;

  }

  static bool is_call_at(address instr);

  // MT-safe patching of a call instruction.

  static void insert(address code_pos, address entry) {

    (void)nativeFarCall_overwriting_at(code_pos, entry);

  }

  static void replace_mt_safe(address instr_addr, address code_buffer);

};

#endif // _LP64

// An interface for accessing/manipulating native set_oop imm, reg instructions.

// (used to manipulate inlined data references, etc.)

//      set_oop imm, reg

//      == sethi %hi22(imm), reg ;  add reg, %lo10(imm), reg

class NativeMovConstReg;

inline NativeMovConstReg* nativeMovConstReg_at(address address);

class NativeMovConstReg: public NativeInstruction {

 public:

  enum Sparc_specific_constants {

    sethi_offset           = 0,

#ifdef _LP64

    add_offset             = 7 * BytesPerInstWord,

    instruction_size       = 8 * BytesPerInstWord

#else

    add_offset             = 4,

    instruction_size       = 8

#endif

  };

  address instruction_address() const       { return addr_at(0); }

  address next_instruction_address() const  { return addr_at(instruction_size); }

  // (The [set_]data accessor respects oop_type relocs also.)

  intptr_t data() const;

  void set_data(intptr_t x);

  // report the destination register

  Register destination() { return inv_rd(long_at(sethi_offset)); }