/*

 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

#include "precompiled.hpp"

#include "assembler_sparc.inline.hpp"

#include "memory/resourceArea.hpp"

#include "nativeInst_sparc.hpp"

#include "oops/oop.inline.hpp"

#include "runtime/handles.hpp"

#include "runtime/sharedRuntime.hpp"

#include "runtime/stubRoutines.hpp"

#include "utilities/ostream.hpp"

#ifdef COMPILER1

#include "c1/c1_Runtime1.hpp"

#endif

bool NativeInstruction::is_dtrace_trap() {

  return !is_nop();

}

void NativeInstruction::set_data64_sethi(address instaddr, intptr_t x) {

  ResourceMark rm;

  CodeBuffer buf(instaddr, 10 * BytesPerInstWord );

  MacroAssembler* _masm = new MacroAssembler(&buf);

  Register destreg;

  destreg = inv_rd(*(unsigned int *)instaddr);

  // Generate a the new sequence

  _masm->patchable_sethi(x, destreg);

  ICache::invalidate_range(instaddr, 7 * BytesPerInstWord);

}

void NativeInstruction::verify_data64_sethi(address instaddr, intptr_t x) {

  ResourceMark rm;

  unsigned char buffer[10 * BytesPerInstWord];

  CodeBuffer buf(buffer, 10 * BytesPerInstWord);

  MacroAssembler masm(&buf);

  Register destreg = inv_rd(*(unsigned int *)instaddr);

  // Generate the proper sequence into a temporary buffer and compare

  // it with the original sequence.

  masm.patchable_sethi(x, destreg);

  int len = buffer - masm.pc();

  for (int i = 0; i < len; i++) {

    assert(instaddr[i] == buffer[i], "instructions must match");

  }

}

void NativeInstruction::verify() {

  // make sure code pattern is actually an instruction address

  address addr = addr_at(0);

  if (addr == 0 || ((intptr_t)addr & 3) != 0) {

    fatal("not an instruction address");

  }

}

void NativeInstruction::print() {

  tty->print_cr(INTPTR_FORMAT ": 0x%x", addr_at(0), long_at(0));

}

void NativeInstruction::set_long_at(int offset, int i) {

  address addr = addr_at(offset);

  *(int*)addr = i;

  ICache::invalidate_word(addr);

}

void NativeInstruction::set_jlong_at(int offset, jlong i) {

  address addr = addr_at(offset);

  *(jlong*)addr = i;

  // Don't need to invalidate 2 words here, because

  // the flush instruction operates on doublewords.

  ICache::invalidate_word(addr);

}

void NativeInstruction::set_addr_at(int offset, address x) {

  address addr = addr_at(offset);

  assert( ((intptr_t)addr & (wordSize-1)) == 0, "set_addr_at bad address alignment");

  *(uintptr_t*)addr = (uintptr_t)x;

  // Don't need to invalidate 2 words here in the 64-bit case,

  // because the flush instruction operates on doublewords.

  ICache::invalidate_word(addr);

  // The Intel code has this assertion for NativeCall::set_destination,

  // NativeMovConstReg::set_data, NativeMovRegMem::set_offset,

  // NativeJump::set_jump_destination, and NativePushImm32::set_data

  //assert (Patching_lock->owned_by_self(), "must hold lock to patch instruction")

}

bool NativeInstruction::is_zero_test(Register &reg) {

  int x = long_at(0);

  Assembler::op3s temp = (Assembler::op3s) (Assembler::sub_op3 | Assembler::cc_bit_op3);

  if (is_op3(x, temp, Assembler::arith_op) &&

      inv_immed(x) && inv_rd(x) == G0) {

      if (inv_rs1(x) == G0) {

        reg = inv_rs2(x);

        return true;

      } else if (inv_rs2(x) == G0) {

        reg = inv_rs1(x);

        return true;

      }

  }

  return false;

}

bool NativeInstruction::is_load_store_with_small_offset(Register reg) {

  int x = long_at(0);

  if (is_op(x, Assembler::ldst_op) &&

      inv_rs1(x) == reg && inv_immed(x)) {

    return true;

  }

  return false;

}

void NativeCall::verify() {

  NativeInstruction::verify();

  // make sure code pattern is actually a call instruction

  if (!is_op(long_at(0), Assembler::call_op)) {

    fatal("not a call");

  }

}

void NativeCall::print() {

  tty->print_cr(INTPTR_FORMAT ": call " INTPTR_FORMAT, instruction_address(), destination());

}

// MT-safe patching of a call instruction (and following word).

// First patches the second word, and then atomicly replaces

// the first word with the first new instruction word.

// Other processors might briefly see the old first word

// followed by the new second word.  This is OK if the old

// second word is harmless, and the new second word may be

// harmlessly executed in the delay slot of the call.

void NativeCall::replace_mt_safe(address instr_addr, address code_buffer) {

  assert(Patching_lock->is_locked() ||

         SafepointSynchronize::is_at_safepoint(), "concurrent code patching");

   assert (instr_addr != NULL, "illegal address for code patching");

   NativeCall* n_call =  nativeCall_at (instr_addr); // checking that it is a call

   assert(NativeCall::instruction_size == 8, "wrong instruction size; must be 8");

   int i0 = ((int*)code_buffer)[0];

   int i1 = ((int*)code_buffer)[1];

   int* contention_addr = (int*) n_call->addr_at(1*BytesPerInstWord);

   assert(inv_op(*contention_addr) == Assembler::arith_op ||

          *contention_addr == nop_instruction() || !VM_Version::v9_instructions_work(),

          "must not interfere with original call");

   // The set_long_at calls do the ICacheInvalidate so we just need to do them in reverse order

   n_call->set_long_at(1*BytesPerInstWord, i1);

   n_call->set_long_at(0*BytesPerInstWord, i0);

   // NOTE:  It is possible that another thread T will execute

   // only the second patched word.

   // In other words, since the original instruction is this

   //    call patching_stub; nop                   (NativeCall)

   // and the new sequence from the buffer is this:

   //    sethi %hi(K), %r; add %r, %lo(K), %r      (NativeMovConstReg)

   // what T will execute is this:

   //    call patching_stub; add %r, %lo(K), %r

   // thereby putting garbage into %r before calling the patching stub.

   // This is OK, because the patching stub ignores the value of %r.

   // Make sure the first-patched instruction, which may co-exist

   // briefly with the call, will do something harmless.

   assert(inv_op(*contention_addr) == Assembler::arith_op ||

          *contention_addr == nop_instruction() || !VM_Version::v9_instructions_work(),

          "must not interfere with original call");

}

// Similar to replace_mt_safe, but just changes the destination.  The

// important thing is that free-running threads are able to execute this

// call instruction at all times.  Thus, the displacement field must be

// instruction-word-aligned.  This is always true on SPARC.

//

// Used in the runtime linkage of calls; see class CompiledIC.

void NativeCall::set_destination_mt_safe(address dest) {

  assert(Patching_lock->is_locked() ||

         SafepointSynchronize::is_at_safepoint(), "concurrent code patching");

  // set_destination uses set_long_at which does the ICache::invalidate

  set_destination(dest);

}

// Code for unit testing implementation of NativeCall class

void NativeCall::test() {

#ifdef ASSERT

  ResourceMark rm;

  CodeBuffer cb("test", 100, 100);

  MacroAssembler* a = new MacroAssembler(&cb);

  NativeCall  *nc;

  uint idx;

  int offsets[] = {

    0x0,

    0xfffffff0,

    0x7ffffff0,

    0x80000000,

    0x20,

    0x4000,

  };

  VM_Version::allow_all();

  a->call( a->pc(), relocInfo::none );

  a->delayed()->nop();

  nc = nativeCall_at( cb.insts_begin() );

  nc->print();

  nc = nativeCall_overwriting_at( nc->next_instruction_address() );

  for (idx = 0; idx < ARRAY_SIZE(offsets); idx++) {

    nc->set_destination( cb.insts_begin() + offsets[idx] );

    assert(nc->destination() == (cb.insts_begin() + offsets[idx]), "check unit test");

    nc->print();

  }

  nc = nativeCall_before( cb.insts_begin() + 8 );

  nc->print();

  VM_Version::revert();

#endif

}

// End code for unit testing implementation of NativeCall class

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

#ifdef _LP64

void NativeFarCall::set_destination(address dest) {

  // Address materialized in the instruction stream, so nothing to do.

  return;

#if 0 // What we'd do if we really did want to change the destination

  if (destination() == dest) {

    return;

  }

  ResourceMark rm;

  CodeBuffer buf(addr_at(0), instruction_size + 1);

  MacroAssembler* _masm = new MacroAssembler(&buf);

  // Generate the new sequence

  AddressLiteral(dest);

  _masm->jumpl_to(dest, O7, O7);

  ICache::invalidate_range(addr_at(0), instruction_size );

#endif

}

void NativeFarCall::verify() {

  // make sure code pattern is actually a jumpl_to instruction

  assert((int)instruction_size == (int)NativeJump::instruction_size, "same as jump_to");

  assert((int)jmpl_offset == (int)NativeMovConstReg::add_offset, "sethi size ok");

  nativeJump_at(addr_at(0))->verify();

}

bool NativeFarCall::is_call_at(address instr) {

  return nativeInstruction_at(instr)->is_sethi();

}

void NativeFarCall::print() {

  tty->print_cr(INTPTR_FORMAT ": call " INTPTR_FORMAT, instruction_address(), destination());

}

bool NativeFarCall::destination_is_compiled_verified_entry_point() {

  nmethod* callee = CodeCache::find_nmethod(destination());

  if (callee == NULL) {

    return false;

  } else {

    return destination() == callee->verified_entry_point();

  }

}

// MT-safe patching of a far call.

void NativeFarCall::replace_mt_safe(address instr_addr, address code_buffer) {

  Unimplemented();

}

// Code for unit testing implementation of NativeFarCall class

void NativeFarCall::test() {

  Unimplemented();

}

// End code for unit testing implementation of NativeFarCall class

#endif // _LP64

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

void NativeMovConstReg::verify() {

  NativeInstruction::verify();

  // make sure code pattern is actually a "set_oop" synthetic instruction

  // see MacroAssembler::set_oop()

  int i0 = long_at(sethi_offset);

  int i1 = long_at(add_offset);

  // verify the pattern "sethi %hi22(imm), reg ;  add reg, %lo10(imm), reg"

  Register rd = inv_rd(i0);

#ifndef _LP64

  if (!(is_op2(i0, Assembler::sethi_op2) && rd != G0 &&

        is_op3(i1, Assembler::add_op3, Assembler::arith_op) &&

        inv_immed(i1) && (unsigned)get_simm13(i1) < (1 << 10) &&

        rd == inv_rs1(i1) && rd == inv_rd(i1))) {

    fatal("not a set_oop");

  }

#else

  if (!is_op2(i0, Assembler::sethi_op2) && rd != G0 ) {

    fatal("not a set_oop");

  }

#endif

}

void NativeMovConstReg::print() {

  tty->print_cr(INTPTR_FORMAT ": mov reg, " INTPTR_FORMAT, instruction_address(), data());

}

#ifdef _LP64

intptr_t NativeMovConstReg::data() const {

  return data64(addr_at(sethi_offset), long_at(add_offset));

}

#else

intptr_t NativeMovConstReg::data() const {

  return data32(long_at(sethi_offset), long_at(add_offset));

}

#endif

void NativeMovConstReg::set_data(intptr_t x) {

#ifdef _LP64

  set_data64_sethi(addr_at(sethi_offset), x);

#else

  set_long_at(sethi_offset, set_data32_sethi(  long_at(sethi_offset), x));

#endif

  set_long_at(add_offset,   set_data32_simm13( long_at(add_offset),   x));

  // also store the value into an oop_Relocation cell, if any

  CodeBlob* cb = CodeCache::find_blob(instruction_address());

  nmethod*  nm = cb ? cb->as_nmethod_or_null() : NULL;

  if (nm != NULL) {

    RelocIterator iter(nm, instruction_address(), next_instruction_address());

    oop* oop_addr = NULL;

    while (iter.next()) {

      if (iter.type() == relocInfo::oop_type) {

        oop_Relocation *r = iter.oop_reloc();

        if (oop_addr == NULL) {

          oop_addr = r->oop_addr();

          *oop_addr = (oop)x;

        } else {

          assert(oop_addr == r->oop_addr(), "must be only one set-oop here");

        }

      }

    }

  }

}

// Code for unit testing implementation of NativeMovConstReg class

void NativeMovConstReg::test() {

#ifdef ASSERT

  ResourceMark rm;

  CodeBuffer cb("test", 100, 100);

  MacroAssembler* a = new MacroAssembler(&cb);

  NativeMovConstReg* nm;

  uint idx;

  int offsets[] = {

    0x0,

    0x7fffffff,

    0x80000000,

    0xffffffff,

    0x20,

    4096,

    4097,

  };

  VM_Version::allow_all();

  AddressLiteral al1(0xaaaabbbb, relocInfo::external_word_type);

  a->sethi(al1, I3);

  a->add(I3, al1.low10(), I3);

  AddressLiteral al2(0xccccdddd, relocInfo::external_word_type);

  a->sethi(al2, O2);

  a->add(O2, al2.low10(), O2);

  nm = nativeMovConstReg_at( cb.insts_begin() );

  nm->print();

  nm = nativeMovConstReg_at( nm->next_instruction_address() );

  for (idx = 0; idx < ARRAY_SIZE(offsets); idx++) {

    nm->set_data( offsets[idx] );

    assert(nm->data() == offsets[idx], "check unit test");

  }

  nm->print();

  VM_Version::revert();

#endif

}

// End code for unit testing implementation of NativeMovConstReg class

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

void NativeMovConstRegPatching::verify() {

  NativeInstruction::verify();

  // Make sure code pattern is sethi/nop/add.

  int i0 = long_at(sethi_offset);

  int i1 = long_at(nop_offset);

  int i2 = long_at(add_offset);

  assert((int)nop_offset == (int)NativeMovConstReg::add_offset, "sethi size ok");

  // Verify the pattern "sethi %hi22(imm), reg; nop; add reg, %lo10(imm), reg"

  // The casual reader should note that on Sparc a nop is a special case if sethi

  // in which the destination register is %g0.

  Register rd0 = inv_rd(i0);

  Register rd1 = inv_rd(i1);

  if (!(is_op2(i0, Assembler::sethi_op2) && rd0 != G0 &&

        is_op2(i1, Assembler::sethi_op2) && rd1 == G0 &&        // nop is a special case of sethi

        is_op3(i2, Assembler::add_op3, Assembler::arith_op) &&

        inv_immed(i2) && (unsigned)get_simm13(i2) < (1 << 10) &&

        rd0 == inv_rs1(i2) && rd0 == inv_rd(i2))) {

    fatal("not a set_oop");

  }

}

void NativeMovConstRegPatching::print() {

  tty->print_cr(INTPTR_FORMAT ": mov reg, " INTPTR_FORMAT, instruction_address(), data());

}

int NativeMovConstRegPatching::data() const {

#ifdef _LP64

  return data64(addr_at(sethi_offset), long_at(add_offset));

#else

  return data32(long_at(sethi_offset), long_at(add_offset));

#endif

}

void NativeMovConstRegPatching::set_data(int x) {

#ifdef _LP64

  set_data64_sethi(addr_at(sethi_offset), x);

#else

  set_long_at(sethi_offset, set_data32_sethi(long_at(sethi_offset), x));

#endif

  set_long_at(add_offset, set_data32_simm13(long_at(add_offset), x));

  // also store the value into an oop_Relocation cell, if any

  CodeBlob* cb = CodeCache::find_blob(instruction_address());

  nmethod*  nm = cb ? cb->as_nmethod_or_null() : NULL;

  if (nm != NULL) {

    RelocIterator iter(nm, instruction_address(), next_instruction_address());

    oop* oop_addr = NULL;

    while (iter.next()) {

      if (iter.type() == relocInfo::oop_type) {

        oop_Relocation *r = iter.oop_reloc();

        if (oop_addr == NULL) {

          oop_addr = r->oop_addr();

          *oop_addr = (oop)x;

        } else {

          assert(oop_addr == r->oop_addr(), "must be only one set-oop here");

        }

      }

    }

  }

}

// Code for unit testing implementation of NativeMovConstRegPatching class

void NativeMovConstRegPatching::test() {

#ifdef ASSERT

  ResourceMark rm;

  CodeBuffer cb("test", 100, 100);

  MacroAssembler* a = new MacroAssembler(&cb);

  NativeMovConstRegPatching* nm;

  uint idx;

  int offsets[] = {

    0x0,

    0x7fffffff,

    0x80000000,

    0xffffffff,

    0x20,

    4096,

    4097,

  };

  VM_Version::allow_all();

  AddressLiteral al1(0xaaaabbbb, relocInfo::external_word_type);

  a->sethi(al1, I3);

  a->nop();

  a->add(I3, al1.low10(), I3);

  AddressLiteral al2(0xccccdddd, relocInfo::external_word_type);

  a->sethi(al2, O2);

  a->nop();

  a->add(O2, al2.low10(), O2);

  nm = nativeMovConstRegPatching_at( cb.insts_begin() );

  nm->print();

  nm = nativeMovConstRegPatching_at( nm->next_instruction_address() );

  for (idx = 0; idx < ARRAY_SIZE(offsets); idx++) {

    nm->set_data( offsets[idx] );

    assert(nm->data() == offsets[idx], "check unit test");

  }

  nm->print();

  VM_Version::revert();

#endif // ASSERT

}

// End code for unit testing implementation of NativeMovConstRegPatching class